{"id":30969,"date":"2026-08-07T07:35:48","date_gmt":"2026-08-07T07:35:48","guid":{"rendered":"https:\/\/jiclcd.com\/?p=30969"},"modified":"2026-08-07T07:39:01","modified_gmt":"2026-08-07T07:39:01","slug":"lcd-white-spots-on-screen-causes-types-how-to-fix-them-2026-guide","status":"publish","type":"post","link":"https:\/\/jiclcd.com\/fr\/lcd-white-spots-on-screen-causes-types-how-to-fix-them-2026-guide\/","title":{"rendered":"Taches blanches sur un \u00e9cran LCD : causes, types et solutions (Guide 2026)"},"content":{"rendered":"<figure class=\"wp-block-image size-large\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1771\" height=\"1024\" src=\"https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/01_hero_white_spots_guide-1771x1024.webp\" alt=\"guide_sur_les_taches_blanches\" class=\"wp-image-30970\" srcset=\"https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/01_hero_white_spots_guide-1771x1024.webp 1771w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/01_hero_white_spots_guide-300x173.webp 300w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/01_hero_white_spots_guide-150x87.webp 150w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/01_hero_white_spots_guide-768x444.webp 768w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/01_hero_white_spots_guide-1536x888.webp 1536w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/01_hero_white_spots_guide-18x10.webp 18w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/01_hero_white_spots_guide-500x289.webp 500w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/01_hero_white_spots_guide-600x347.webp 600w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/01_hero_white_spots_guide.webp 1780w\" sizes=\"(max-width: 1771px) 100vw, 1771px\" \/><figcaption class=\"wp-element-caption\">guide_sur_les_taches_blanches<\/figcaption><\/figure>\n\n\n\n<p><strong>R\u00e9ponse rapide :<\/strong> Les taches blanches sur les \u00e9crans LCD sont des zones lumineuses et irr\u00e9guli\u00e8res qui apparaissent lorsque la lumi\u00e8re du r\u00e9tro\u00e9clairage s'\u00e9chappe par des interstices dans la couche de cristaux liquides, la plaque diffuseuse ou le film polarisant. Elles sont g\u00e9n\u00e9ralement caus\u00e9es par une pression physique, des contraintes thermiques, des d\u00e9fauts de fabrication ou le vieillissement des composants du r\u00e9tro\u00e9clairage. Si certaines taches dues \u00e0 la pression peuvent s'estomper, la plupart n\u00e9cessitent une r\u00e9paration ou un remplacement de la dalle. Pour les applications industrielles et m\u00e9dicales, la pr\u00e9vention par le biais de <strong>liaison optique<\/strong> et une conception m\u00e9canique renforc\u00e9e constitue la solution la plus fiable.<\/p>\n\n\n\n<div id=\"ez-toc-container\" class=\"ez-toc-v2_0_82_2 counter-hierarchy ez-toc-counter ez-toc-grey ez-toc-container-direction\">\n<div class=\"ez-toc-title-container\">\n<p class=\"ez-toc-title\" style=\"cursor:inherit\">Table des mati\u00e8res<\/p>\n<span class=\"ez-toc-title-toggle\"><a href=\"#\" class=\"ez-toc-pull-right ez-toc-btn ez-toc-btn-xs ez-toc-btn-default ez-toc-toggle\" aria-label=\"Toggle Table des mati\u00e8res\"><span class=\"ez-toc-js-icon-con\"><span class=\"\"><span class=\"eztoc-hide\" style=\"display:none;\">Toggle<\/span><span class=\"ez-toc-icon-toggle-span\"><svg style=\"fill: #999;color:#999\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" class=\"list-377408\" width=\"20px\" height=\"20px\" viewbox=\"0 0 24 24\" fill=\"none\"><path d=\"M6 6H4v2h2V6zm14 0H8v2h12V6zM4 11h2v2H4v-2zm16 0H8v2h12v-2zM4 16h2v2H4v-2zm16 0H8v2h12v-2z\" fill=\"currentColor\"><\/path><\/svg><svg style=\"fill: #999;color:#999\" class=\"arrow-unsorted-368013\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" width=\"10px\" height=\"10px\" viewbox=\"0 0 24 24\" version=\"1.2\" baseprofile=\"tiny\"><path d=\"M18.2 9.3l-6.2-6.3-6.2 6.3c-.2.2-.3.4-.3.7s.1.5.3.7c.2.2.4.3.7.3h11c.3 0 .5-.1.7-.3.2-.2.3-.5.3-.7s-.1-.5-.3-.7zM5.8 14.7l6.2 6.3 6.2-6.3c.2-.2.3-.5.3-.7s-.1-.5-.3-.7c-.2-.2-.4-.3-.7-.3h-11c-.3 0-.5.1-.7.3-.2.2-.3.5-.3.7s.1.5.3.7z\"\/><\/svg><\/span><\/span><\/span><\/a><\/span><\/div>\n<nav><ul class='ez-toc-list ez-toc-list-level-1' ><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-1\" href=\"https:\/\/jiclcd.com\/fr\/lcd-white-spots-on-screen-causes-types-how-to-fix-them-2026-guide\/#What_Are_LCD_White_Spots\" >Que sont les taches blanches sur les \u00e9crans LCD ?<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-2\" href=\"https:\/\/jiclcd.com\/fr\/lcd-white-spots-on-screen-causes-types-how-to-fix-them-2026-guide\/#The_Physics_Behind_White_Spots\" >La physique derri\u00e8re les taches blanches<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-3\" href=\"https:\/\/jiclcd.com\/fr\/lcd-white-spots-on-screen-causes-types-how-to-fix-them-2026-guide\/#Common_Causes_of_White_Spots_on_LCD_Screens\" >Causes courantes des taches blanches sur les \u00e9crans LCD<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-4\" href=\"https:\/\/jiclcd.com\/fr\/lcd-white-spots-on-screen-causes-types-how-to-fix-them-2026-guide\/#1_Physical_Pressure_or_Impact\" >1. Pression physique ou choc<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-5\" href=\"https:\/\/jiclcd.com\/fr\/lcd-white-spots-on-screen-causes-types-how-to-fix-them-2026-guide\/#2_Backlight_Diffuser_Plate_Shift\" >2. D\u00e9calage de la plaque diffuseuse du r\u00e9tro\u00e9clairage<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-6\" href=\"https:\/\/jiclcd.com\/fr\/lcd-white-spots-on-screen-causes-types-how-to-fix-them-2026-guide\/#3_Thermal_Stress_and_Aging\" >3. Contraintes thermiques et vieillissement<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-7\" href=\"https:\/\/jiclcd.com\/fr\/lcd-white-spots-on-screen-causes-types-how-to-fix-them-2026-guide\/#4_Manufacturing_Defects\" >4. D\u00e9fauts de fabrication<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-8\" href=\"https:\/\/jiclcd.com\/fr\/lcd-white-spots-on-screen-causes-types-how-to-fix-them-2026-guide\/#5_Moisture_Ingress\" >5. Infiltration d'humidit\u00e9<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-9\" href=\"https:\/\/jiclcd.com\/fr\/lcd-white-spots-on-screen-causes-types-how-to-fix-them-2026-guide\/#6_LED_Backlight_Degradation\" >6. D\u00e9gradation du r\u00e9tro\u00e9clairage LED<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-10\" href=\"https:\/\/jiclcd.com\/fr\/lcd-white-spots-on-screen-causes-types-how-to-fix-them-2026-guide\/#Types_of_LCD_White_Spots\" >Types de taches blanches sur les \u00e9crans LCD<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-11\" href=\"https:\/\/jiclcd.com\/fr\/lcd-white-spots-on-screen-causes-types-how-to-fix-them-2026-guide\/#White_Spots_vs_Other_LCD_Defects\" >Taches blanches et autres d\u00e9fauts d'\u00e9cran LCD<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-12\" href=\"https:\/\/jiclcd.com\/fr\/lcd-white-spots-on-screen-causes-types-how-to-fix-them-2026-guide\/#How_to_Fix_White_Spots_on_LCD_Screens\" >Comment \u00e9liminer les taches blanches sur les \u00e9crans LCD<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-13\" href=\"https:\/\/jiclcd.com\/fr\/lcd-white-spots-on-screen-causes-types-how-to-fix-them-2026-guide\/#Method_1_Gentle_Pressure_Massage_Pressure_Spots_Only\" >M\u00e9thode n\u00b0 1 : massage par pression douce (uniquement sur les points de pression)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-14\" href=\"https:\/\/jiclcd.com\/fr\/lcd-white-spots-on-screen-causes-types-how-to-fix-them-2026-guide\/#Method_2_Pixel_Refresh_Inversion_Cycle\" >M\u00e9thode 2 : Cycle de rafra\u00eechissement \/ d'inversion des pixels<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-15\" href=\"https:\/\/jiclcd.com\/fr\/lcd-white-spots-on-screen-causes-types-how-to-fix-them-2026-guide\/#Method_3_Diffuser_Plate_Realignment_Professional_Repair\" >M\u00e9thode 3 : R\u00e9alignement de la plaque de diffusion (r\u00e9paration par un professionnel)<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-16\" href=\"https:\/\/jiclcd.com\/fr\/lcd-white-spots-on-screen-causes-types-how-to-fix-them-2026-guide\/#Method_4_Backlight_Unit_Replacement\" >M\u00e9thode 4 : Remplacement du module de r\u00e9tro\u00e9clairage<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-17\" href=\"https:\/\/jiclcd.com\/fr\/lcd-white-spots-on-screen-causes-types-how-to-fix-them-2026-guide\/#Method_5_Panel_Replacement\" >M\u00e9thode n\u00b0 5 : Remplacement du panneau<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-18\" href=\"https:\/\/jiclcd.com\/fr\/lcd-white-spots-on-screen-causes-types-how-to-fix-them-2026-guide\/#Prevention_Avoiding_White_Spots_in_Industrial_Displays\" >Pr\u00e9vention : comment \u00e9viter l'apparition de taches blanches sur les \u00e9crans industriels<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-19\" href=\"https:\/\/jiclcd.com\/fr\/lcd-white-spots-on-screen-causes-types-how-to-fix-them-2026-guide\/#1_Optical_Bonding\" >1. Collage optique<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-20\" href=\"https:\/\/jiclcd.com\/fr\/lcd-white-spots-on-screen-causes-types-how-to-fix-them-2026-guide\/#2_Reinforced_Mechanical_Design\" >2. Conception m\u00e9canique renforc\u00e9e<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-21\" href=\"https:\/\/jiclcd.com\/fr\/lcd-white-spots-on-screen-causes-types-how-to-fix-them-2026-guide\/#3_Wide-Temperature_Component_Selection\" >3. S\u00e9lection de composants adapt\u00e9s \u00e0 une large plage de temp\u00e9ratures<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-22\" href=\"https:\/\/jiclcd.com\/fr\/lcd-white-spots-on-screen-causes-types-how-to-fix-them-2026-guide\/#4_AOI_and_100_Uniformity_Testing\" >4. Tests d'uniformit\u00e9 de l'AOI et du 100%<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-23\" href=\"https:\/\/jiclcd.com\/fr\/lcd-white-spots-on-screen-causes-types-how-to-fix-them-2026-guide\/#5_Proper_Packaging_and_Handling\" >5. Emballage et manutention appropri\u00e9s<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-24\" href=\"https:\/\/jiclcd.com\/fr\/lcd-white-spots-on-screen-causes-types-how-to-fix-them-2026-guide\/#When_to_Repair_vs_Replace\" >Quand faut-il r\u00e9parer ou remplacer ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-25\" href=\"https:\/\/jiclcd.com\/fr\/lcd-white-spots-on-screen-causes-types-how-to-fix-them-2026-guide\/#People_Also_Ask_FAQ\" >Questions fr\u00e9quentes (FAQ)<\/a><ul class='ez-toc-list-level-3' ><li class='ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-26\" href=\"https:\/\/jiclcd.com\/fr\/lcd-white-spots-on-screen-causes-types-how-to-fix-them-2026-guide\/#Are_LCD_white_spots_permanent\" >Les taches blanches sur les \u00e9crans LCD sont-elles d\u00e9finitives ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-27\" href=\"https:\/\/jiclcd.com\/fr\/lcd-white-spots-on-screen-causes-types-how-to-fix-them-2026-guide\/#Can_white_spots_spread_over_time\" >Les taches blanches peuvent-elles s'\u00e9tendre avec le temps ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-28\" href=\"https:\/\/jiclcd.com\/fr\/lcd-white-spots-on-screen-causes-types-how-to-fix-them-2026-guide\/#Do_white_spots_mean_my_LCD_is_dying\" >Est-ce que la pr\u00e9sence de taches blanches signifie que mon \u00e9cran LCD est en train de rendre l'\u00e2me ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-29\" href=\"https:\/\/jiclcd.com\/fr\/lcd-white-spots-on-screen-causes-types-how-to-fix-them-2026-guide\/#Can_pressure_cause_white_spots_on_an_LCD\" >La pression peut-elle provoquer l'apparition de taches blanches sur un \u00e9cran LCD ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-30\" href=\"https:\/\/jiclcd.com\/fr\/lcd-white-spots-on-screen-causes-types-how-to-fix-them-2026-guide\/#How_much_does_it_cost_to_fix_white_spots_on_an_LCD\" >Combien co\u00fbte la r\u00e9paration des taches blanches sur un \u00e9cran LCD ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-31\" href=\"https:\/\/jiclcd.com\/fr\/lcd-white-spots-on-screen-causes-types-how-to-fix-them-2026-guide\/#Are_white_spots_covered_by_warranty\" >Les taches blanches sont-elles couvertes par la garantie ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-32\" href=\"https:\/\/jiclcd.com\/fr\/lcd-white-spots-on-screen-causes-types-how-to-fix-them-2026-guide\/#Can_white_spots_appear_on_brand-new_LCD_displays\" >Des taches blanches peuvent-elles appara\u00eetre sur des \u00e9crans LCD flambant neufs ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-33\" href=\"https:\/\/jiclcd.com\/fr\/lcd-white-spots-on-screen-causes-types-how-to-fix-them-2026-guide\/#Whats_the_difference_between_white_spots_and_backlight_bleeding\" >Quelle est la diff\u00e9rence entre les taches blanches et le \u00ab bleeding \u00bb du r\u00e9tro\u00e9clairage ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-34\" href=\"https:\/\/jiclcd.com\/fr\/lcd-white-spots-on-screen-causes-types-how-to-fix-them-2026-guide\/#Can_software_fix_white_spots_on_an_LCD\" >Un logiciel peut-il corriger les taches blanches sur un \u00e9cran LCD ?<\/a><\/li><li class='ez-toc-page-1 ez-toc-heading-level-3'><a class=\"ez-toc-link ez-toc-heading-35\" href=\"https:\/\/jiclcd.com\/fr\/lcd-white-spots-on-screen-causes-types-how-to-fix-them-2026-guide\/#How_do_I_test_my_LCD_for_white_spots\" >Comment puis-je v\u00e9rifier si mon \u00e9cran LCD pr\u00e9sente des taches blanches ?<\/a><\/li><\/ul><\/li><li class='ez-toc-page-1 ez-toc-heading-level-2'><a class=\"ez-toc-link ez-toc-heading-36\" href=\"https:\/\/jiclcd.com\/fr\/lcd-white-spots-on-screen-causes-types-how-to-fix-them-2026-guide\/#Conclusion\" >Conclusion<\/a><\/li><\/ul><\/nav><\/div>\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"What_Are_LCD_White_Spots\"><\/span>Que sont les taches blanches sur les \u00e9crans LCD ?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p><a href=\"https:\/\/jiclcd.com\/fr\/module-lcd-tft\/\" data-type=\"link\" data-id=\"https:\/\/jiclcd.com\/tft-lcd-module\/\">LCD<\/a> taches blanches (\u00e9galement appel\u00e9es <strong>taches blanches<\/strong>, <strong>opacification<\/strong>, ou <strong>fuite de lumi\u00e8re<\/strong>) sont des zones claires visibles sur un \u00e9cran, o\u00f9 la lumi\u00e8re du r\u00e9tro\u00e9clairage traverse la dalle de mani\u00e8re in\u00e9gale. Contrairement aux pixels morts \u2014 qui se pr\u00e9sentent sous la forme de minuscules points noirs \u2014, les taches blanches sont g\u00e9n\u00e9ralement plus grandes (de 2 mm \u00e0 20 mm) et leur forme et leur intensit\u00e9 varient.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1601\" height=\"1024\" src=\"https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/02_lcd_layer_structure-1601x1024.webp\" alt=\"\" class=\"wp-image-30971\" srcset=\"https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/02_lcd_layer_structure-1601x1024.webp 1601w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/02_lcd_layer_structure-300x192.webp 300w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/02_lcd_layer_structure-150x96.webp 150w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/02_lcd_layer_structure-768x491.webp 768w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/02_lcd_layer_structure-1536x982.webp 1536w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/02_lcd_layer_structure-2048x1310.webp 2048w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/02_lcd_layer_structure-18x12.webp 18w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/02_lcd_layer_structure-500x320.webp 500w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/02_lcd_layer_structure-600x384.webp 600w\" sizes=\"(max-width: 1601px) 100vw, 1601px\" \/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"The_Physics_Behind_White_Spots\"><\/span>La physique derri\u00e8re les taches blanches<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Une dalle LCD TFT standard se compose de plusieurs couches de haute pr\u00e9cision :<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Unit\u00e9 de r\u00e9tro\u00e9clairage (BLU)<\/strong> \u2014 des bandes LED ou des tubes CCFL servant \u00e0 l'\u00e9clairage<\/li>\n\n\n\n<li><strong>Plaque diffuseuse \/ Plaque de guidage de la lumi\u00e8re (LGP)<\/strong> \u2014 R\u00e9partit la lumi\u00e8re de mani\u00e8re homog\u00e8ne sur l'ensemble du panneau<\/li>\n\n\n\n<li><strong>Couche de cristaux liquides<\/strong> \u2014 R\u00e9gule la transmission de la lumi\u00e8re gr\u00e2ce \u00e0 l'alignement mol\u00e9culaire<\/li>\n\n\n\n<li><strong>Films polarisants<\/strong> \u2014 Filtrer les ondes lumineuses pour cr\u00e9er des images<\/li>\n\n\n\n<li><strong>Matrice de filtres de couleur<\/strong> \u2014 Ajoute des sous-pixels RVB<\/li>\n<\/ol>\n\n\n\n<p>Des taches blanches apparaissent lorsque cette structure optique est perturb\u00e9e. Par exemple, si le <strong>d\u00e9placements de la plaque de diffusion<\/strong> m\u00eame d\u2019un \u00e9cart de 0,5 mm d\u00fb \u00e0 la dilatation thermique ou \u00e0 un choc m\u00e9canique, la lumi\u00e8re se concentre dans une zone au lieu de se r\u00e9partir uniform\u00e9ment. De m\u00eame, si le <strong>couche de cristaux liquides<\/strong> lorsqu'une pression localis\u00e9e s'exerce, les mol\u00e9cules ne parviennent pas \u00e0 se tordre correctement, ce qui laisse passer un exc\u00e8s de lumi\u00e8re.<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>Point cl\u00e9 :<\/strong> Dans les \u00e9crans industriels fonctionnant 24 heures sur 24, 7 jours sur 7, les cycles thermiques (chauffage et refroidissement) constituent la principale cause du d\u00e9placement de la plaque diffuseur et de la formation de taches blanches.<\/p>\n<\/blockquote>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Common_Causes_of_White_Spots_on_LCD_Screens\"><\/span>Causes courantes des taches blanches sur les \u00e9crans LCD <span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Il est essentiel de comprendre la cause profonde du probl\u00e8me pour d\u00e9terminer si un \u00e9l\u00e9ment peut \u00eatre r\u00e9par\u00e9 ou s'il doit \u00eatre remplac\u00e9.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_Physical_Pressure_or_Impact\"><\/span>1. Pression physique ou choc<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>La cause la plus fr\u00e9quente sur les appareils grand public. Lorsqu'une force est exerc\u00e9e sur l'\u00e9cran \u2014 par exemple en refermant un ordinateur portable alors que des d\u00e9bris se trouvent sur le clavier, en laissant tomber un appareil ou en empilant des objets lourds sur un \u00e9cran \u2014, le <strong>la couche de cristaux liquides se comprime<\/strong> et le <strong>la plaque de diffusion se d\u00e9forme<\/strong>. M\u00eame une fois la pression supprim\u00e9e, la m\u00e9moire \u00e9lastique des films optiques peut faire persister une tache claire.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Dimensions habituelles :<\/strong> Taches circulaires ou irr\u00e9guli\u00e8res de 3 \u00e0 10 mm<\/li>\n\n\n\n<li><strong>Chances de gu\u00e9rison :<\/strong> Faible \u00e0 mod\u00e9r\u00e9e (peut s'estomper au fil des jours, mais est souvent permanente)<\/li>\n\n\n\n<li><strong>On le trouve couramment dans :<\/strong> Ordinateurs portables, tablettes, appareils mobiles, \u00e9crans embarqu\u00e9s dans les v\u00e9hicules<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Backlight_Diffuser_Plate_Shift\"><\/span>2. D\u00e9calage de la plaque diffuseuse du r\u00e9tro\u00e9clairage<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Dans les \u00e9crans LCD \u00e0 r\u00e9tro\u00e9clairage lat\u00e9ral, le <strong>plaque de guidage de lumi\u00e8re (LGP)<\/strong> et les feuilles de diffusion sont maintenues en place par des cadres en plastique fragiles. Avec le temps, la dilatation thermique, les vibrations ou un montage d\u00e9fectueux peuvent entra\u00eener un d\u00e9calage de ces feuilles de l'ordre de quelques fractions de millim\u00e8tre. Lorsque le diffuseur s'\u00e9loigne du bord de la LED, la lumi\u00e8re s'\u00e9chappe directement, cr\u00e9ant ainsi une tache ou une tra\u00een\u00e9e blanche brillante.<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Dimensions habituelles :<\/strong> Tra\u00een\u00e9es lin\u00e9aires ou vastes zones de voile<\/li>\n\n\n\n<li><strong>Chances de gu\u00e9rison :<\/strong> Mod\u00e9r\u00e9 (peut parfois \u00eatre repositionn\u00e9 pendant la r\u00e9paration)<\/li>\n\n\n\n<li><strong>On le trouve couramment dans :<\/strong> Grands \u00e9crans, \u00e9crans de t\u00e9l\u00e9vision, interfaces homme-machine (IHM) industrielles<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_Thermal_Stress_and_Aging\"><\/span>3. Contraintes thermiques et vieillissement<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>\u00c9crans LCD industriels fonctionnant \u00e0 <strong>environnements \u00e0 large plage de temp\u00e9ratures (de -30 \u00b0C \u00e0 80 \u00b0C)<\/strong> subissent des cycles thermiques r\u00e9p\u00e9t\u00e9s. Cela entra\u00eene :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>D\u00e9gradation des couches adh\u00e9sives entre les films optiques<\/li>\n\n\n\n<li>Les plaques de diffusion peuvent se d\u00e9former ou se d\u00e9laminer<\/li>\n\n\n\n<li>Les bandes de r\u00e9tro\u00e9clairage LED se d\u00e9t\u00e9riorent de mani\u00e8re in\u00e9gale<\/li>\n<\/ul>\n\n\n\n<p>Au bout de plus de 5 000 heures de fonctionnement, ces micro-alt\u00e9rations s'accumulent pour former des taches blanches visibles, notamment dans les angles o\u00f9 la dissipation thermique est la plus faible.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4_Manufacturing_Defects\"><\/span>4. D\u00e9fauts de fabrication<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Toutes les taches blanches ne sont pas dues \u00e0 l'utilisateur. Lors de l'assemblage du module LCD :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Particules \u00e9trang\u00e8res<\/strong> entre le diffuseur et la vitre de l'\u00e9cran LCD peuvent cr\u00e9er des points de pression<\/li>\n\n\n\n<li><strong>Application in\u00e9gale de la colle<\/strong> le collage optique peut retenir des bulles d'air qui se dilatent pour former des taches blanches<\/li>\n\n\n\n<li><strong>Tension du film polarisant<\/strong> ces irr\u00e9gularit\u00e9s provoquent des fuites de lumi\u00e8re localis\u00e9es<\/li>\n<\/ul>\n\n\n\n<p>Les fabricants de haute qualit\u00e9 utilisent <strong>AOI (inspection optique automatis\u00e9e)<\/strong> et un assemblage en salle blanche (classe ISO 7 ou sup\u00e9rieure) afin de r\u00e9duire au minimum ces d\u00e9fauts. Les fabricants de panneaux \u00e0 bas prix font souvent l'impasse sur ces \u00e9tapes, ce qui se traduit par des taux de taches blanches plus \u00e9lev\u00e9s une fois les panneaux install\u00e9s.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"5_Moisture_Ingress\"><\/span>5. Infiltration d'humidit\u00e9<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Dans les environnements ext\u00e9rieurs ou tr\u00e8s humides, l'humidit\u00e9 peut s'infiltrer par des joints endommag\u00e9s. Lorsque la vapeur d'eau se condense entre la vitre de l'\u00e9cran LCD et les films de r\u00e9tro\u00e9clairage, cela provoque un <strong>effet de diffusion<\/strong> qui se pr\u00e9sente sous la forme d'une tache blanche trouble. Contrairement aux taches dues \u00e0 la pression, les taches blanches caus\u00e9es par l'humidit\u00e9 changent souvent de taille en fonction de la temp\u00e9rature.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"6_LED_Backlight_Degradation\"><\/span>6. D\u00e9gradation du r\u00e9tro\u00e9clairage LED<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Dans les panneaux LED \u00e0 \u00e9clairage direct, les diodes LED individuelles peuvent se d\u00e9t\u00e9riorer \u00e0 des rythmes diff\u00e9rents. Si une LED devient nettement plus lumineuse que ses voisines (ou si le diffuseur situ\u00e9 au-dessus d'elle tombe en panne), cela se traduit par l'apparition d'un point lumineux localis\u00e9. Ce ph\u00e9nom\u00e8ne est plus fr\u00e9quent sur les \u00e9crans dot\u00e9s de <strong>mauvaise gestion thermique<\/strong> ou des bandes LED de mauvaise qualit\u00e9.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Types_of_LCD_White_Spots\"><\/span>Types de taches blanches sur les \u00e9crans LCD <span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Type<\/th><th>Aspect<\/th><th>Cause principale<\/th><th>R\u00e9parabilit\u00e9<\/th><\/tr><\/thead><tbody><tr><td><strong>Une seule tache blanche<\/strong><\/td><td>Petit point lumineux aux contours nets (2 \u00e0 5 mm)<\/td><td>Particule sous le diffuseur, point de pression<\/td><td>Faible<\/td><\/tr><tr><td><strong>Taches \/ Irr\u00e9gularit\u00e9s<\/strong><\/td><td>Grande tache claire et diffuse (10 \u00e0 50 mm)<\/td><td>D\u00e9calage du diffuseur, d\u00e9formation thermique<\/td><td>Mod\u00e9r\u00e9<\/td><\/tr><tr><td><strong>Saignement p\u00e9riph\u00e9rique<\/strong><\/td><td>Bande claire le long d'un ou plusieurs bords<\/td><td>D\u00e9salignement de la plaque de guidage de lumi\u00e8re, jeu au niveau du cadre<\/td><td>Mod\u00e9r\u00e9<\/td><\/tr><tr><td><strong>Point de pression<\/strong><\/td><td>Forme irr\u00e9guli\u00e8re, souvent accompagn\u00e9e d'un halo arc-en-ciel<\/td><td>Impact physique sur la couche LC<\/td><td>Faible<\/td><\/tr><tr><td><strong>Patch hydratant<\/strong><\/td><td>Nuageux, dont la taille varie en fonction de la temp\u00e9rature<\/td><td>D\u00e9faillance du joint, infiltration d'humidit\u00e9<\/td><td>\u00c9lev\u00e9 (si la r\u00e9colte est effectu\u00e9e t\u00f4t)<\/td><\/tr><tr><td><strong>Point chaud LED<\/strong><\/td><td>Rep\u00e9rer le point lumineux situ\u00e9 directement au-dessus de la LED<\/td><td>Surchauffe des LED, d\u00e9faillance du diffuseur<\/td><td>Mod\u00e9r\u00e9<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" width=\"1388\" height=\"1024\" src=\"https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/03_white_spot_types-1388x1024.webp\" alt=\"\" class=\"wp-image-30972\" srcset=\"https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/03_white_spot_types-1388x1024.webp 1388w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/03_white_spot_types-300x221.webp 300w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/03_white_spot_types-150x111.webp 150w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/03_white_spot_types-768x567.webp 768w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/03_white_spot_types-1536x1133.webp 1536w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/03_white_spot_types-16x12.webp 16w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/03_white_spot_types-500x369.webp 500w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/03_white_spot_types-600x443.webp 600w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/03_white_spot_types.webp 2001w\" sizes=\"(max-width: 1388px) 100vw, 1388px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"White_Spots_vs_Other_LCD_Defects\"><\/span>Taches blanches et autres d\u00e9fauts d'\u00e9cran LCD<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Les taches blanches sont souvent confondues avec d'autres probl\u00e8mes d'affichage. Voici comment les distinguer :<\/p>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>D\u00e9faut<\/th><th>Aspect<\/th><th>Cause<\/th><th>Lieu<\/th><\/tr><\/thead><tbody><tr><td><strong>White Spot<\/strong><\/td><td>Tache claire et diffuse ; visible sur des fonds sombres<\/td><td>Fuite de r\u00e9tro\u00e9clairage, probl\u00e8me de diffuseur<\/td><td>N'importe o\u00f9 \u00e0 l'\u00e9cran<\/td><\/tr><tr><td><strong>Pixel mort<\/strong><\/td><td>Petit point noir (un seul sous-pixel ou un pixel entier)<\/td><td>D\u00e9faillance d'un transistor dans une matrice TFT<\/td><td>Position fixe, tr\u00e8s petite<\/td><\/tr><tr><td><strong>Pixel bloqu\u00e9<\/strong><\/td><td>Un seul point lumineux (rouge, vert, bleu ou blanc)<\/td><td>Transistor de sous-pixel bloqu\u00e9 en position \u201c marche \u201d<\/td><td>Position fixe, 1 pixel<\/td><\/tr><tr><td><strong>Salissures \/ Taches<\/strong><\/td><td>Irr\u00e9gulier, visible lorsque l'\u00e9cran est \u00e9teint<\/td><td>Contamination externe \u00e0 la surface du verre<\/td><td>S'enl\u00e8ve au nettoyage<\/td><\/tr><tr><td><strong>Bulle sur l'\u00e9cran LCD<\/strong><\/td><td>Zone ronde et sur\u00e9lev\u00e9e pr\u00e9sentant une d\u00e9formation<\/td><td>Air emprisonn\u00e9 dans la couche de liaison optique<\/td><td>G\u00e9n\u00e9ralement au centre ou sur les bords<\/td><\/tr><tr><td><strong>Fuite de r\u00e9tro\u00e9clairage<\/strong><\/td><td>Luminosit\u00e9 uniforme sur les bords du panneau<\/td><td>Pression du cadre d'\u00e9cran, lueur IPS<\/td><td>Uniquement les bords<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>Conseil de diagnostic :<\/strong> \u00c9teignez l'\u00e9cran. Si la tache dispara\u00eet compl\u00e8tement, il s'agit d'un probl\u00e8me de r\u00e9tro\u00e9clairage (tache blanche ou d\u00e9bordement de lumi\u00e8re). Si elle reste sous forme de point noir, c'est un pixel mort. Si vous pouvez la sentir avec votre doigt ou l'essuyer, il s'agit d'une salet\u00e9 externe.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1358\" height=\"1024\" src=\"https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/04_defect_comparison-1358x1024.webp\" alt=\"\" class=\"wp-image-30973\" srcset=\"https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/04_defect_comparison-1358x1024.webp 1358w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/04_defect_comparison-300x226.webp 300w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/04_defect_comparison-150x113.webp 150w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/04_defect_comparison-768x579.webp 768w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/04_defect_comparison-1536x1158.webp 1536w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/04_defect_comparison-16x12.webp 16w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/04_defect_comparison-500x377.webp 500w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/04_defect_comparison-600x452.webp 600w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/04_defect_comparison.webp 1915w\" sizes=\"(max-width: 1358px) 100vw, 1358px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_to_Fix_White_Spots_on_LCD_Screens\"><\/span>Comment \u00e9liminer les taches blanches sur les \u00e9crans LCD <span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>La solution appropri\u00e9e d\u00e9pend de la cause du probl\u00e8me, de la valeur affich\u00e9e et du type d'\u00e9cran (grand public ou industriel).<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Method_1_Gentle_Pressure_Massage_Pressure_Spots_Only\"><\/span>M\u00e9thode n\u00b0 1 : massage par pression douce (uniquement sur les points de pression)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Pour les taches r\u00e9centes dues \u00e0 la pression, l\u00e0 o\u00f9 la couche de cristaux liquides ne s'est pas encore stabilis\u00e9e de mani\u00e8re d\u00e9finitive :<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u00c9teignez compl\u00e8tement l'\u00e9cran<\/li>\n\n\n\n<li>Appliquez un <strong>chiffon doux en microfibre<\/strong> au comptant<\/li>\n\n\n\n<li>Utilisez un outil non pointu et non conducteur (comme un stylet en caoutchouc) pour appliquer <strong>une pression tr\u00e8s douce et circulaire<\/strong><\/li>\n\n\n\n<li>Massez en partant du centre de la zone concern\u00e9e vers l'ext\u00e9rieur pendant 30 \u00e0 60 secondes<\/li>\n\n\n\n<li>Mettre sous tension et v\u00e9rifier<\/li>\n<\/ol>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p><strong>Avertissement :<\/strong> Cette m\u00e9thode risque d'aggraver les d\u00e9g\u00e2ts. N'utilisez jamais d'objets pointus ni ne forcez excessivement. Les \u00e9crans industriels dot\u00e9s d'un assemblage optique sont particuli\u00e8rement sensibles \u00e0 cette technique.<\/p>\n<\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Method_2_Pixel_Refresh_Inversion_Cycle\"><\/span>M\u00e9thode 2 : Cycle de rafra\u00eechissement \/ d'inversion des pixels<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Certaines taches blanches \u2014 en particulier celles dues \u00e0 un d\u00e9salignement temporaire des cristaux liquides \u2014 peuvent \u00eatre \u00e9limin\u00e9es en soumettant l'\u00e9cran \u00e0 des cycles complets de blanc\/noir pendant 2 \u00e0 4 heures. Cette m\u00e9thode est plus efficace pour <strong>r\u00e9tention d'image<\/strong> plut\u00f4t que de v\u00e9ritables taches blanches, mais cela vaut la peine d'essayer sur des \u00e9crans grand public dot\u00e9s de fonctions int\u00e9gr\u00e9es de rafra\u00eechissement des pixels.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Method_3_Diffuser_Plate_Realignment_Professional_Repair\"><\/span>M\u00e9thode 3 : R\u00e9alignement de la plaque de diffusion (r\u00e9paration par un professionnel)<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>En cas de d\u00e9bordement sur les bords ou de voile d\u00fb \u00e0 un d\u00e9calage du diffuseur :<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>D\u00e9montez le cadre de l'\u00e9cran et le blindage m\u00e9tallique<\/li>\n\n\n\n<li>Inspecter la plaque de guidage de la lumi\u00e8re et l'ensemble de diffuseurs<\/li>\n\n\n\n<li>Repositionnez soigneusement le diffuseur afin qu\u2019il recouvre uniform\u00e9ment les bords des LED.<\/li>\n\n\n\n<li>Postuler <strong>ruban adh\u00e9sif de qualit\u00e9 optique<\/strong> pour fixer les draps<\/li>\n\n\n\n<li>Remontez l'appareil et v\u00e9rifiez l'uniformit\u00e9<\/li>\n<\/ol>\n\n\n\n<p>Cela n\u00e9cessite un environnement exempt de poussi\u00e8re. Une seule particule qui resterait coinc\u00e9e lors du remontage cr\u00e9erait une nouvelle tache blanche.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Method_4_Backlight_Unit_Replacement\"><\/span>M\u00e9thode 4 : Remplacement du module de r\u00e9tro\u00e9clairage<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Si la tache blanche est due \u00e0 la d\u00e9gradation des LED, \u00e0 un diffuseur endommag\u00e9 ou \u00e0 une d\u00e9formation du LGP, la solution la plus fiable consiste \u00e0 remplacer l'ensemble du <strong>unit\u00e9 de r\u00e9tro\u00e9clairage<\/strong>. Pour les tailles d'\u00e9cran standard (15,6 pouces, 21,5 pouces, 23,8 pouces), des modules BLU de remplacement sont souvent disponibles. Pour <strong>\u00e9crans industriels sur mesure<\/strong>, le remplacement n\u00e9cessite de respecter les caract\u00e9ristiques optiques d'origine.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Method_5_Panel_Replacement\"><\/span>M\u00e9thode n\u00b0 5 : Remplacement du panneau<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Lorsque les taches blanches sont dues \u00e0 :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>D\u00e9gradation de la couche de cristaux liquides<\/li>\n\n\n\n<li>Fracture interne du verre<\/li>\n\n\n\n<li>D\u00e9lamination importante du polariseur<\/li>\n<\/ul>\n\n\n\n<p>\u2026la dalle doit \u00eatre remplac\u00e9e. La r\u00e9paration n'est pas rentable pour la plupart des \u00e9crans de moins de 32 pouces.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1432\" height=\"1024\" src=\"https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/05_repair_flowchart-1432x1024.webp\" alt=\"\" class=\"wp-image-30974\" srcset=\"https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/05_repair_flowchart-1432x1024.webp 1432w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/05_repair_flowchart-300x214.webp 300w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/05_repair_flowchart-150x107.webp 150w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/05_repair_flowchart-768x549.webp 768w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/05_repair_flowchart-1536x1098.webp 1536w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/05_repair_flowchart-2048x1464.webp 2048w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/05_repair_flowchart-18x12.webp 18w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/05_repair_flowchart-500x357.webp 500w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/05_repair_flowchart-600x429.webp 600w\" sizes=\"(max-width: 1432px) 100vw, 1432px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Prevention_Avoiding_White_Spots_in_Industrial_Displays\"><\/span>Pr\u00e9vention : comment \u00e9viter l'apparition de taches blanches sur les \u00e9crans industriels<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Pour les acheteurs B2B et les concepteurs de produits, <strong>pr\u00e9vention au stade de la fabrication<\/strong> est bien plus rentable qu'une r\u00e9paration sur site. Voici les strat\u00e9gies techniques qui permettent d'\u00e9liminer les taches blanches avant m\u00eame qu'elles n'apparaissent :<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"1_Optical_Bonding\"><\/span>1. Collage optique<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p><strong>Liaison optique<\/strong> \u00e9limine l'espace d'air entre la vitre de l'\u00e9cran LCD et l'\u00e9cran tactile\/la lentille de protection en le comblant avec un adh\u00e9sif optiquement transparent (OCA) ou une r\u00e9sine (OCR). Cela offre trois avantages en mati\u00e8re de pr\u00e9vention des taches blanches :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u00c9limine la r\u00e9flexion interne<\/strong> qui peuvent accentuer les d\u00e9fauts mineurs du diffuseur<\/li>\n\n\n\n<li><strong>Renforce la rigidit\u00e9 structurelle<\/strong>, ce qui \u00e9vite toute pression exerc\u00e9e sur la couche LC due \u00e0 la flexion<\/li>\n\n\n\n<li><strong>Emp\u00eache la p\u00e9n\u00e9tration de l'humidit\u00e9<\/strong> qui provoque l'apparition de taches opaques<\/li>\n<\/ul>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\">\n<p>Au <strong>JicTech<\/strong>, notre proc\u00e9d\u00e9 de collage optique est r\u00e9alis\u00e9 dans un <strong>Salle blanche de classe ISO 7<\/strong> gr\u00e2ce \u00e0 un syst\u00e8me de dosage automatis\u00e9 et \u00e0 un laminage sous vide, garantissant l'absence totale de contamination par des particules et une \u00e9paisseur d'adh\u00e9sif uniforme.<\/p>\n<\/blockquote>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"2_Reinforced_Mechanical_Design\"><\/span>2. Conception m\u00e9canique renforc\u00e9e<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Les \u00e9crans industriels doivent pr\u00e9senter les caract\u00e9ristiques suivantes :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Ch\u00e2ssis m\u00e9tallique assurant une r\u00e9partition uniforme de la pression<\/strong> sur tout le pourtour du panneau<\/li>\n\n\n\n<li><strong>Joints amortisseurs<\/strong> entre l'\u00e9cran LCD et le cadre avant<\/li>\n\n\n\n<li><strong>Sp\u00e9cifications de couple correctes<\/strong> pour les vis de fixation (un couple irr\u00e9gulier entra\u00eene l'apparition de points de pression)<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"3_Wide-Temperature_Component_Selection\"><\/span>3. S\u00e9lection de composants adapt\u00e9s \u00e0 une large plage de temp\u00e9ratures<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Les composants LCD grand public standard sont con\u00e7us pour fonctionner entre 0 \u00b0C et 50 \u00b0C. Les applications industrielles n\u00e9cessitent :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>M\u00e9langes de cristaux liquides \u00e0 large plage de temp\u00e9ratures<\/strong> (plage de fonctionnement : de -30 \u00b0C \u00e0 80 \u00b0C)<\/li>\n\n\n\n<li><strong>Plaques de diffusion \u00e0 Tg (temp\u00e9rature de transition vitreuse) \u00e9lev\u00e9e<\/strong> qui r\u00e9sistent \u00e0 la d\u00e9formation<\/li>\n\n\n\n<li><strong>Conception de la gestion thermique<\/strong> \u00e9quip\u00e9s de dissipateurs thermiques pour \u00e9liminer les points chauds<\/li>\n<\/ul>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"4_AOI_and_100_Uniformity_Testing\"><\/span>4. Tests d'uniformit\u00e9 de l'AOI et du 100%<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Les taches blanches d'une taille aussi petite que 0,3 mm peuvent \u00eatre d\u00e9tect\u00e9es par les techniques modernes <strong>Inspection optique automatis\u00e9e (AOI)<\/strong> syst\u00e8mes. Cependant, de nombreux fabricants ne pr\u00e9l\u00e8vent des \u00e9chantillons que sur 5 \u00e0 10% de panneaux. <strong>Test d'uniformit\u00e9 du r\u00e9tro\u00e9clairage du mod\u00e8le 100%<\/strong>\u2014 o\u00f9 chaque panneau est contr\u00f4l\u00e9 en 9 ou 13 points pour v\u00e9rifier l'\u00e9cart de luminance \u2014 garantit qu'aucun point blanc ne quitte l'usine.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"5_Proper_Packaging_and_Handling\"><\/span>5. Emballage et manutention appropri\u00e9s<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Pendant le transport et l'installation :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>Utilisation <strong>inserts en mousse antistatique<\/strong> qui \u00e9pousent parfaitement les contours du panneau<\/li>\n\n\n\n<li>Ne jamais empiler les \u00e9crans face vers le bas<\/li>\n\n\n\n<li>Maintenir <strong>Protocoles de manipulation sans risque d'ESD<\/strong> (les d\u00e9charges \u00e9lectrostatiques peuvent endommager les transistors TFT, provoquant l'apparition de points lumineux)<\/li>\n<\/ul>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1439\" height=\"1024\" src=\"https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/06_prevention_diagram-1439x1024.webp\" alt=\"\" class=\"wp-image-30975\" srcset=\"https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/06_prevention_diagram-1439x1024.webp 1439w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/06_prevention_diagram-300x213.webp 300w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/06_prevention_diagram-150x107.webp 150w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/06_prevention_diagram-768x546.webp 768w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/06_prevention_diagram-1536x1093.webp 1536w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/06_prevention_diagram-2048x1457.webp 2048w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/06_prevention_diagram-18x12.webp 18w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/06_prevention_diagram-500x356.webp 500w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/06_prevention_diagram-600x427.webp 600w\" sizes=\"(max-width: 1439px) 100vw, 1439px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"When_to_Repair_vs_Replace\"><\/span>Quand faut-il r\u00e9parer ou remplacer ?<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>Sc\u00e9nario<\/th><th>Mesure recommand\u00e9e<\/th><th>Estimation des co\u00fbts<\/th><\/tr><\/thead><tbody><tr><td>Petite tache isol\u00e9e sur un \u00e9cran grand public<\/td><td>\u00c0 utiliser si cela ne pose pas de probl\u00e8me ; \u00e0 remplacer si cela d\u00e9range<\/td><td>$0\u2013$200<\/td><\/tr><tr><td>Taches multiples \/ voiles sur un \u00e9cran IHM industriel<\/td><td>Remplacer le BLU ou le panneau complet<\/td><td>$150\u2013$600<\/td><\/tr><tr><td>Taches blanches sur un \u00e9cran m\u00e9dical<\/td><td><strong>Remplacer imm\u00e9diatement<\/strong> \u2014 affecte la pr\u00e9cision du diagnostic<\/td><td>$500\u2013$3 000<\/td><\/tr><tr><td>Taches blanches sur un \u00e9cran neuf (&lt; 30 jours)<\/td><td>Remplacement sous garantie<\/td><td>$0<\/td><\/tr><tr><td>Taches blanches suite \u00e0 une d\u00e9faillance du collage optique<\/td><td>Renvoyer au fabricant pour un recollage<\/td><td>$100\u2013$400<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p><strong>R\u00e8gle empirique :<\/strong> Si la tache blanche affecte une zone de visualisation critique (au centre de l'\u00e9cran, 50%) ou si l'\u00e9cran est utilis\u00e9 pour l'imagerie m\u00e9dicale, le contr\u00f4le industriel ou l'instrumentation automobile, <strong>le remplacement est la seule option s\u00fbre<\/strong>.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"1212\" height=\"1024\" src=\"https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/07_repair_vs_replace-1212x1024.webp\" alt=\"\" class=\"wp-image-30976\" srcset=\"https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/07_repair_vs_replace-1212x1024.webp 1212w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/07_repair_vs_replace-300x253.webp 300w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/07_repair_vs_replace-150x127.webp 150w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/07_repair_vs_replace-768x649.webp 768w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/07_repair_vs_replace-1536x1297.webp 1536w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/07_repair_vs_replace-14x12.webp 14w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/07_repair_vs_replace-500x422.webp 500w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/07_repair_vs_replace-600x507.webp 600w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/07_repair_vs_replace.webp 1930w\" sizes=\"(max-width: 1212px) 100vw, 1212px\" \/><\/figure>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"People_Also_Ask_FAQ\"><\/span>Questions fr\u00e9quentes (FAQ)<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Are_LCD_white_spots_permanent\"><\/span>Les taches blanches sur les \u00e9crans LCD sont-elles d\u00e9finitives ?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>La plupart des taches blanches dues \u00e0 une pression physique ou \u00e0 un endommagement du diffuseur sont <strong>permanent<\/strong>. Toutefois, le voile provoqu\u00e9 par l'humidit\u00e9 peut dispara\u00eetre si l'\u00e9cran est s\u00e9ch\u00e9 dans un environnement \u00e0 faible taux d'humidit\u00e9. Les taches de pression temporaires peuvent parfois s'estomper en 24 \u00e0 48 heures, \u00e0 mesure que la couche de cristaux liquides se d\u00e9tend.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Can_white_spots_spread_over_time\"><\/span>Les taches blanches peuvent-elles s'\u00e9tendre avec le temps ?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Oui. Si cela est d\u00fb \u00e0 <strong>d\u00e9formation de la plaque de diffusion<\/strong> ou <strong>d\u00e9gradation de l'adh\u00e9sif<\/strong>, les taches blanches s'\u00e9tendent g\u00e9n\u00e9ralement lentement \u00e0 mesure que les cycles thermiques se poursuivent. Une tache de 3 mm peut atteindre 15 mm en 6 \u00e0 12 mois dans des environnements \u00e0 haute temp\u00e9rature. Un remplacement pr\u00e9coce permet d'\u00e9viter toute d\u00e9gradation optique suppl\u00e9mentaire.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Do_white_spots_mean_my_LCD_is_dying\"><\/span>Est-ce que la pr\u00e9sence de taches blanches signifie que mon \u00e9cran LCD est en train de rendre l'\u00e2me ?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Pas forc\u00e9ment. Une seule tache blanche est g\u00e9n\u00e9ralement un <strong>anomalie localis\u00e9e<\/strong>, ce qui ne signifie pas pour autant que le panneau soit compl\u00e8tement hors service. Cependant, l'apparition simultan\u00e9e de plusieurs taches indique souvent <strong>vieillissement du module de r\u00e9tro\u00e9clairage<\/strong> ou <strong>probl\u00e8mes de fabrication syst\u00e9matiques<\/strong>\u2014 un signe indiquant que l'\u00e9cran arrive en fin de vie.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Can_pressure_cause_white_spots_on_an_LCD\"><\/span>La pression peut-elle provoquer l'apparition de taches blanches sur un \u00e9cran LCD ?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Oui. La pression physique est la <strong>Cause du #1<\/strong> de taches blanches sur les ordinateurs portables, les tablettes et les appareils mobiles. M\u00eame une l\u00e9g\u00e8re pression (par exemple, une touche du clavier appuyant contre l'\u00e9cran ferm\u00e9 d'un ordinateur portable) peut d\u00e9placer la plaque diffuseuse ou comprimer la couche de cristaux liquides suffisamment pour cr\u00e9er une tache claire permanente.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_much_does_it_cost_to_fix_white_spots_on_an_LCD\"><\/span>Combien co\u00fbte la r\u00e9paration des taches blanches sur un \u00e9cran LCD ?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>\u00c9crans grand public (15 \u00e0 27 pouces) :<\/strong> $50\u2013$200 pour le remplacement du BLU ; $100\u2013$300 pour le remplacement du panneau<\/li>\n\n\n\n<li><strong>\u00c9crans industriels (7 \u00e0 21,5 pouces) :<\/strong> $150\u2013$600 selon l'interface et l'int\u00e9gration tactile<\/li>\n\n\n\n<li><strong>\u00c9crans sur mesure pour le secteur m\u00e9dical et automobile :<\/strong> $500\u2013$3 000+ en raison des exigences en mati\u00e8re de certification et de collage optique<\/li>\n<\/ul>\n\n\n\n<p>Pour les acheteurs industriels, investir dans <strong>le collage optique et les composants \u00e0 large plage de temp\u00e9rature d\u00e8s le d\u00e9part<\/strong> permet d'\u00e9viter ces co\u00fbts de r\u00e9paration tout au long du cycle de vie du produit.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Are_white_spots_covered_by_warranty\"><\/span>Les taches blanches sont-elles couvertes par la garantie ?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Taches blanches caus\u00e9es par <strong>d\u00e9fauts de fabrication<\/strong> (particules, d\u00e9fauts d'adh\u00e9rence, d\u00e9salignement du diffuseur) sont g\u00e9n\u00e9ralement couverts par la garantie du fabricant pendant une p\u00e9riode de 12 \u00e0 24 mois. Les taches caus\u00e9es par <strong>dommages mat\u00e9riels, mauvaise manipulation ou facteurs environnementaux<\/strong> (l'humidit\u00e9, la chaleur extr\u00eame) sont g\u00e9n\u00e9ralement exclues.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Can_white_spots_appear_on_brand-new_LCD_displays\"><\/span>Des taches blanches peuvent-elles appara\u00eetre sur des \u00e9crans LCD flambant neufs ?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Oui, m\u00eame si cela est rare chez les fabricants r\u00e9put\u00e9s. Les taches blanches sur les panneaux neufs sont presque toujours <strong>d\u00e9fauts de fabrication<\/strong>\u2014des particules emprisonn\u00e9es, un laminage irr\u00e9gulier du polariseur ou des probl\u00e8mes de tol\u00e9rance au niveau de la plaque diffuseuse. C'est pourquoi <strong>Inspection AOI 100%<\/strong> est essentiel pour l'achat d'\u00e9crans \u00e0 usage industriel et m\u00e9dical.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Whats_the_difference_between_white_spots_and_backlight_bleeding\"><\/span>Quelle est la diff\u00e9rence entre les taches blanches et le \u00ab bleeding \u00bb du r\u00e9tro\u00e9clairage ?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Taches blanches :<\/strong> Taches claires localis\u00e9es et irr\u00e9guli\u00e8res apparaissant n'importe o\u00f9 sur l'\u00e9cran ; caus\u00e9es par des probl\u00e8mes au niveau du diffuseur ou de la couche LC<\/li>\n\n\n\n<li><strong>Fuite de lumi\u00e8re du r\u00e9tro\u00e9clairage :<\/strong> Fuite de lumi\u00e8re uniforme sur les bords de la dalle ; caus\u00e9e par la pression exerc\u00e9e par le cadre ou par la conception de la dalle IPS<\/li>\n<\/ul>\n\n\n\n<p>Dans les deux cas, il s'agit de probl\u00e8mes de fuite de r\u00e9tro\u00e9clairage, mais le \u201c bleeding \u201d est souvent consid\u00e9r\u00e9 comme \u00ab normal \u00bb sur les dalles IPS lorsqu'on les regarde sous des angles de vision extr\u00eames, tandis que les taches blanches constituent toujours un d\u00e9faut.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Can_software_fix_white_spots_on_an_LCD\"><\/span>Un logiciel peut-il corriger les taches blanches sur un \u00e9cran LCD ?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<p>Non. Les taches blanches sont <strong>d\u00e9fauts physiques<\/strong> au sein du module optique ou de l'unit\u00e9 de r\u00e9tro\u00e9clairage. Aucun utilitaire logiciel, aucun outil de rafra\u00eechissement des pixels ni aucune mise \u00e0 jour de pilote ne peut r\u00e9parer une plaque diffuseuse d\u00e9plac\u00e9e ou une couche de cristaux liquides endommag\u00e9e. Les solutions logicielles ne fonctionnent que pour les pixels bloqu\u00e9s ou les images r\u00e9manentes.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"How_do_I_test_my_LCD_for_white_spots\"><\/span>Comment puis-je v\u00e9rifier si mon \u00e9cran LCD pr\u00e9sente des taches blanches ?<span class=\"ez-toc-section-end\"><\/span><\/h3>\n\n\n\n<ol class=\"wp-block-list\">\n<li>Afficher un <strong>image enti\u00e8rement noire<\/strong> (RVB 0,0,0) dans une pi\u00e8ce sombre<\/li>\n\n\n\n<li>Examinez l'\u00e9cran \u00e0 une distance de visionnage normale pour rep\u00e9rer d'\u00e9ventuelles taches claires<\/li>\n\n\n\n<li>V\u00e9rifiez bien les quatre coins et le centre en particulier<\/li>\n\n\n\n<li>R\u00e9p\u00e9tez l'op\u00e9ration avec <strong>rouge, vert et bleu purs<\/strong> des images permettant d'\u00e9carter les probl\u00e8mes li\u00e9s \u00e0 la couleur<\/li>\n\n\n\n<li>Pour les \u00e9crans industriels, utilisez un <strong>luminancem\u00e8tre<\/strong> pour mesurer l'uniformit\u00e9 (l'\u00e9cart doit \u00eatre inf\u00e9rieur \u00e0 15% sur toute la zone active)<\/li>\n<\/ol>\n\n\n\n<h2 class=\"wp-block-heading\"><span class=\"ez-toc-section\" id=\"Conclusion\"><\/span>Conclusion<span class=\"ez-toc-section-end\"><\/span><\/h2>\n\n\n\n<p>Les taches blanches sur les \u00e9crans LCD constituent un d\u00e9faut courant mais \u00e9vitable qui touche aussi bien les tablettes grand public que les syst\u00e8mes d'imagerie m\u00e9dicale critiques. Si les taches mineures peuvent parfois \u00eatre tol\u00e9r\u00e9es, la seule solution fiable \u00e0 long terme \u2014 en particulier pour les applications industrielles, automobiles et m\u00e9dicales \u2014 est <strong>la pr\u00e9vention gr\u00e2ce \u00e0 des proc\u00e9d\u00e9s de fabrication de pointe<\/strong>.<\/p>\n\n\n\n<p>Points cl\u00e9s \u00e0 retenir :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Pression physique et contrainte thermique<\/strong> sont les principales causes des taches blanches<\/li>\n\n\n\n<li><strong>D\u00e9placements de la plaque de diffusion et endommagement de la couche de cristaux liquides<\/strong> n\u00e9cessitent une intervention au niveau du panneau<\/li>\n\n\n\n<li><strong>Collage optique, composants \u00e0 large plage de temp\u00e9rature et inspection AOI<\/strong> \u00e9liminer 95%+ des risques de taches blanches au niveau de l'usine<\/li>\n\n\n\n<li>Les acheteurs industriels devraient donner la priorit\u00e9 \u00e0 <strong>Essais d'uniformit\u00e9 100%<\/strong> et <strong>garanties de disponibilit\u00e9 \u00e0 long terme<\/strong><\/li>\n<\/ul>\n\n\n\n<p>Au <strong>JicTech<\/strong>, Nous sommes sp\u00e9cialis\u00e9s dans <strong>\u00e9crans LCD TFT sur mesure<\/strong> con\u00e7us pour garantir une performance sans d\u00e9faut dans des environnements exigeants. Notre processus de fabrication comprend :<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Certifi\u00e9 ISO 9001 et IATF 16949<\/strong> gestion de la qualit\u00e9<\/li>\n\n\n\n<li><strong>Salle blanche de classe ISO 7<\/strong> collage optique et assemblage<\/li>\n\n\n\n<li><strong>100% AOI + contr\u00f4le de l'uniformit\u00e9 du r\u00e9tro\u00e9clairage<\/strong> sur chaque panneau<\/li>\n\n\n\n<li><strong>Conceptions pour une large plage de temp\u00e9ratures<\/strong> (plage de fonctionnement : de -30 \u00b0C \u00e0 80 \u00b0C)<\/li>\n\n\n\n<li><strong>Collage optique, blindage anti-interf\u00e9rences \u00e9lectromagn\u00e9tiques et verre de protection sur mesure<\/strong> int\u00e9gration<\/li>\n<\/ul>\n\n\n\n<p>Que vous ayez besoin d'un<a href=\"https:\/\/jiclcd.com\/fr\/produit\/7-0-inch-tft-lcd-module-2\/\" data-type=\"link\" data-id=\"https:\/\/jiclcd.com\/product\/7-0-inch-tft-lcd-module-2\/\"> <strong>IHM industrielle de 7 pouces<\/strong><\/a>, un <strong><a href=\"https:\/\/jiclcd.com\/fr\/produit\/12-1%e2%80%91inch-ips-tft-lcd-display-module\/\" data-type=\"link\" data-id=\"https:\/\/jiclcd.com\/product\/12-1%e2%80%91inch-ips-tft-lcd-display-module\/\">\u00c9cran m\u00e9dical de 12,1 pouces<\/a><\/strong>, ou un <strong><a href=\"https:\/\/jiclcd.com\/fr\/automotive\/\" data-type=\"link\" data-id=\"https:\/\/jiclcd.com\/automotive\/\">\u00e9cran LCD personnalis\u00e9 pour tableau de bord automobile<\/a><\/strong>, notre \u00e9quipe d'ing\u00e9nieurs veille \u00e0 ce que votre \u00e9cran fonctionne sans faille tout au long de son cycle de vie.<\/p>\n\n\n\n<p><strong><a href=\"https:\/\/jiclcd.com\/fr\/contact\/\" data-type=\"link\" data-id=\"https:\/\/jiclcd.com\/contact\/\">Contactez JicTech d\u00e8s aujourd'hui<\/a><\/strong> pour discuter de vos besoins sp\u00e9cifiques en mati\u00e8re d'\u00e9crans LCD, demander des \u00e9chantillons ou consulter l'int\u00e9gralit\u00e9 de nos rapports de tests optiques. Laissez-nous concevoir un \u00e9cran qui ne donnera jamais \u00e0 vos utilisateurs finaux une raison de rechercher \u201c comment r\u00e9parer les taches blanches \u201d.\u201d<\/p>\n\n\n\n<p><em>Derni\u00e8re mise \u00e0 jour : ao\u00fbt 2026 | Caract\u00e9ristiques techniques susceptibles d'\u00eatre am\u00e9lior\u00e9es en permanence<\/em><\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img loading=\"lazy\" decoding=\"async\" width=\"729\" height=\"1024\" src=\"https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/08_infographic_summary-729x1024.webp\" alt=\"\" class=\"wp-image-30977\" srcset=\"https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/08_infographic_summary-729x1024.webp 729w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/08_infographic_summary-213x300.webp 213w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/08_infographic_summary-107x150.webp 107w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/08_infographic_summary-768x1079.webp 768w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/08_infographic_summary-1093x1536.webp 1093w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/08_infographic_summary-1457x2048.webp 1457w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/08_infographic_summary-9x12.webp 9w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/08_infographic_summary-500x703.webp 500w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/08_infographic_summary-600x843.webp 600w, https:\/\/jiclcd.com\/wp-content\/uploads\/2026\/08\/08_infographic_summary.webp 1480w\" sizes=\"(max-width: 729px) 100vw, 729px\" \/><\/figure>","protected":false},"excerpt":{"rendered":"<p>Quick Answer: LCD white spots are bright, irregular patches that appear when the backlight leaks through gaps in the liquid crystal layer, diffuser plate, or polarizer film. They are commonly caused by physical pressure, thermal stress, manufacturing defects, or aging backlight components. While some pressure-induced spots may fade, most white spots require panel repair or [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":30970,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[110],"tags":[],"class_list":["post-30969","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tft-lcd"],"blocksy_meta":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>LCD White Spots on Screen: Causes, Types &amp; How to Fix Them (2026 Guide) - Jictech<\/title>\n<meta name=\"description\" content=\"LCD white spots on screen? Learn the causes (pressure, diffuser shift, thermal stress), 6 types with visual identification, and proven fix methods. 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