Suppression of moire pattern for wide/narrow viewing angle switchable TFT-LCD

Hao CAI; Chao-ping CHEN; Jie CHEN; Zi-yao CHENG

doi:10.37188/CJLCD.2020-0228

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Suppression of moire pattern for wide/narrow viewing angle switchable TFT-LCD

Driving and Controlling | 更新时间：2021-03-23

- Suppression of moire pattern for wide/narrow viewing angle switchable TFT-LCD
- Chinese Journal of Liquid Crystals and Displays Vol. 36, Issue 3, Pages: 432-438(2021)
- 作者机构：
  
  1.昆山龙腾光电股份有限公司产品研发中心, 江苏昆山 215300
  2.上海交通大学电子工程系智能显示实验室, 上海 200240
- 作者简介：
- 基金信息：
  
  Supported by National Natural Science Foundation of China;Science and Technology Commission of Shanghai Municipality;Science and Technology Commission of Shanghai Municipality
- DOI：10.37188/CJLCD.2020-0228
  CLC： TN27
- Received：08 September 2020，
  
  Accepted：12 October 2020，
  
  Published：2021-03
- 稿件说明：
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Hao CAI, Chao-ping CHEN, Jie CHEN, et al. Suppression of moire pattern for wide/narrow viewing angle switchable TFT-LCD[J]. Chinese journal of liquid crystals and displays, 2021, 36(3): 432-438.
DOI：

Hao CAI, Chao-ping CHEN, Jie CHEN, et al. Suppression of moire pattern for wide/narrow viewing angle switchable TFT-LCD[J]. Chinese journal of liquid crystals and displays, 2021, 36(3): 432-438. DOI： 10.37188/CJLCD.2020-0228.

摘要

广窄视角可切换型薄膜晶体管液晶显示器面板通常会产生莫尔条纹问题，该问题是由背光模组的脉冲宽度调制信号与窄视角模式下施加在显示面板的交流信号之间的相位差不断变化所造成的。为此，本文提出了一种可行的解决方案。从造成莫尔条纹的根本原因入手，对造成莫尔条纹的干扰信号进行了优化，实现了信号同步，从而消除信号间的相位差。实验结果表明：通过调节面板的每帧开始信号与背光模组的调光信号PWM之间的信号同步，可完美解决莫尔条纹问题。在1 kHz、49.8%占空比PWM信号下，使用显示器色彩分析仪CA-310量测64灰阶下莫尔条纹中心区域的闪烁度由68.5%~72.3%之间的循环跳变，变成稳定的69.9%。我们的产品在采用了上述方案后，窄视角模式下的莫尔条纹现象得到了显著改善。

Abstract

The wide/narrow viewing angle switchable thin film transistor liquid crystal display has the problem of moire pattern

which is caused by the continuous change of the phase between the pulse width modulation signal of backlight and the driving signal applied to the display panel under the narrow viewing angle mode. This paper presents a feasible solution. Since root cause of the moire pattern is identified as the signal interference

our solution is to synchronize the signals so as to minimize the phase difference. The experimental results show that

by synchronizing the display panel's start vertically signal and backlight module' pulse width modulation signal

the moire pattern could be significantly suppressed. Under a pulse width modulation signal with 1 kHz

49.8% duty cycle

the value of the flicker in the center area of the moire is from 68.5% to 72.3% under 64 gray scale measured by using the display color analyzer CA-310

and then becomes stable at 69.9%. Based on this scheme

the actual observation of moire is not noticeable

thus it can give users good viewing experience under narrow viewing angle mode.

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Keywords

references

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Related Author

Chao-ping CHEN

Jie CHEN

Zi-yao CHENG

Hao CAI

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SHEN Yi

ZHAI Chenyang

DONG Chenyao

Related Institution

R&D Center， Infovision Optoelectronics Co. Ltd.， Kunshan

Smart Display Lab， Department of Electronic Engineering， Shanghai Jiao Tong University

Guangdong Provincial Key Laboratory of Automotive Display and Touch Technologies

College of Engineering， Shantou University

TCL China Star Optoelectronics Technology Co.， Ltd.

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