窄长型车载液晶显示屏黑画面漏光研究及改善

毛蕾; 张正元; 范荣华; 娄衍礼; 訾培; 杨溢; 张世德; 任干; 李春丽; 王勋南

doi:10.3788/YJYXS20193410.0982

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窄长型车载液晶显示屏黑画面漏光研究及改善

材料与器件 | 更新时间：2020-08-12

- 窄长型车载液晶显示屏黑画面漏光研究及改善
- Research and improvement of black screen light leakage in narrow-length automotive display
- 液晶与显示 2019年34卷第10期页码：982-991
- 作者机构：
  
  合肥鑫晟光电科技有限公司, 安徽合肥 230012
- 作者简介：
  
  [ "毛蕾(1988—), 女, 安徽宣城人, 学士, 高级工程师, 2014年于合肥工业大学获得学士学位, 主要从事液晶显示行业车载产品良率提升及不良解析及改善方面的研究。E-mail:maolei@boe.com.cn" ]
- 基金信息：
- DOI：10.3788/YJYXS20193410.0982
  中图分类号： TN141.9
- 收稿日期：2019-05-14，
  
  录用日期：2019-8-5，
  
  纸质出版日期：2019-10-05
- 稿件说明：
移动端阅览
毛蕾, 张正元, 范荣华, 等. 窄长型车载液晶显示屏黑画面漏光研究及改善[J]. 液晶与显示, 2019,34(10):982-991.

Lei MAO, Zheng-yuan ZHANG, Rong-hua FAN, et al. Research and improvement of black screen light leakage in narrow-length automotive display[J]. Chinese journal of liquid crystals and displays, 2019, 34(10): 982-991.
毛蕾, 张正元, 范荣华, 等. 窄长型车载液晶显示屏黑画面漏光研究及改善[J]. 液晶与显示, 2019,34(10):982-991. DOI： 10.3788/YJYXS20193410.0982.

Lei MAO, Zheng-yuan ZHANG, Rong-hua FAN, et al. Research and improvement of black screen light leakage in narrow-length automotive display[J]. Chinese journal of liquid crystals and displays, 2019, 34(10): 982-991. DOI： 10.3788/YJYXS20193410.0982.

摘要

黑画面的漏光是高级超维场开关显示模式（Advanced-Super Dimensional Switching，ADS）TFT-LCD中常见的一种不良，当液晶面板有形变或应力作用即容易发生漏光不良，窄长型ADS车载产品更容易受力形变。本文探讨漏光发生的机理并进行改善。研究发现，面板由于形变，内应力，液晶偏转发生异常，最终导致黑画面的漏光。本文以312.4 mm（12.3 in）寸窄长型车载ADS产品为例，首先对平坦度进行分析：从面板平坦度、背光源平坦度、背光源口子胶位置等方面分析。再从应力着手：从模组将集成电路压接在玻璃基板上的工艺（Chip on Glass，COG）、面板和背光源的组装精度进行漏光实验。实验结果表明，在面板平坦度提升、背光源平坦度管控、背光源口子胶设计为半口子胶并由长边固定变更为短边固定，COG绑定温度和压力进行实验设计、组装精度提升等方面改善后，黑画面漏光可从15%降低至0.1%以内。

Abstract

Black light leakage is a common in advanced-super dimensional switching(ADS) mode TFT-LCD product. It is easy to cause light leakage when the panel has deformation or internal stress

especially for narrow-length products. This article discussed the reason of light leakage and improve it. It is found that the panel deformation

internal stress

and liquid crystal deflection are abnormal

which can lead to light leakage. For example

this paper discusses 312.4 mm(12.3 in) ADS automotive product. At first

for flatness:we analyzed the panel flatness

backlight flatness and the location of backlight tape. Second

for internal stress:we analyzed COG (Chip on Glass) technology

assembly accuracy of panel and backlight. Light leakage experiments show that improvement of panel flatness

backlight flatness and assembly accuracy can reduce the level of leakage. Other factors

such as cutting the length of backlight tape and changing its position from long side to short side

controlling COG bonding temperature and pressure with DOE(Design of Experiment) are also effective. All the above measures

light leakage can be reduced from 15% to less than 0.1%.

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