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昆山龙腾光电股份有限公司 产品研发中心, 江苏 昆山 215300
蔡 浩,男,硕士,中级工程师,2018年于上海交通大学获得硕士学位,主要研究方向为TFT-LCD面板驱动设计。E-mail: caiminhaoyu@126.com
收稿:2026-02-27,
修回:2026-03-16,
纸质出版:2026-04-05
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蔡浩, 张晓娥. 动态背光控制对液晶响应时间的影响[J]. 液晶与显示, 2026,41(4):490-497.
CAI Hao, ZHANG Xiao-e. Influence of dynamic backlight control on the liquid crystal response time[J]. Chinese Journal of Liquid Crystals and Displays, 2026, 41(4): 490-497.
蔡浩, 张晓娥. 动态背光控制对液晶响应时间的影响[J]. 液晶与显示, 2026,41(4):490-497. DOI: 10.37188/CJLCD.2026-0023. CSTR: 32172.14.CJLCD.2026-0023.
CAI Hao, ZHANG Xiao-e. Influence of dynamic backlight control on the liquid crystal response time[J]. Chinese Journal of Liquid Crystals and Displays, 2026, 41(4): 490-497. DOI: 10.37188/CJLCD.2026-0023. CSTR: 32172.14.CJLCD.2026-0023.
LCD屏幕在显示黑色画面时出现漏光是一种常见的现象,主要由屏幕结构和背光系统特性搭配导致。而常见的、简单有效的改善方法为降低屏幕整体亮度以显著减少漏光的可见度。本文系统研究了开启动态背光控制(DBC)后液晶响应时间的变化规律,测量了黑白画面下时序控制器(TCON)输出不同PWM占空比(Duty)下的液晶响应时间数据。黑画面漏光通过TCON中DBC功能来解决,即在显示黑画面时,TCON输出的PWM占空比为PWM输入的40%;白画面输出占空比为输入PWM的100%并将信号传输至LED驱动器。此方式可改善黑画面漏光,但在直流(DC)调光应用下,结合LED驱动器识别PWM占空比再到输出LED电流的机制,会导致液晶响应时间的增加。光学仪器测试结果为51.9 ms,严重超出设计规格Max 25 ms。针对此问题,本文提出了在保持LCD 屏幕最大亮度不变前提下,将白画面输出PWM占空比设定为99.6%,经实测液晶响应时间可缩短至24.7 ms,既解决了黑画面漏光问题又能满足液晶响应时间的要求。
Leakage of light is a common phenomenon when a Liquid Crystal Display (LCD) screen displays a black pattern, mainly caused by the combination of the screen structure and the characteristics of the backlight system. A common and simple yet effective way to address this issue is to reduce the overall screen brightness, which can significantly decrease the visibility of the leakage. This paper systematically studies the variation rule of the liquid crystal response time after activating the dynamic backlight control, and measures the liquid crystal response time data under black and white pattern with different PWM(Pulse Width Modulation) duties output by the Timing Controller (TCON). This is achieved through the Dynamic Backlight Control (DBC) function in the TCON, where the PWM duty output by the TCON is 40% of the input PWM when displaying a black pattern, and 100% of the input PWM when displaying a white pattern to the Light Emitting Diode (LED) driver. This method can improve the leakage of the black pattern, but in Direct Current (DC) dimming applications, combined with the mechanism of the LED driver identifying the PWM duty and then outputting the LED current, it will lead to an increase in the liquid crystal response time. The test result of the optical instrument is 51.9 ms, which seriously exceeds the design specification of Max 25 ms. To address this issue, this paper proposes an optimized scheme: the PWM duty for the white pattern output is adjusted to 99.6%, while the maximum brightness of the LCD screen remains unchanged. The measured liquid crystal response time can be shortened to 24.7 ms, which not only solves the problem of black pattern leakage but also meets the liquid crystal response time specification.
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