液晶与显示, 2018, 33 (5): 375, 网络出版: 2018-07-31
TFT-LCD中驱动信号与线残像的关系研究
Relationship between line image sticking and drive signal in TFT-LCD
线残像 畸变 驱动信号反转方式 驱动信号电压 line image sticking distortion the mode of drive signal inversion drive signal voltage
摘要
通过对薄膜晶体管液晶显示器(TFT-LCD)产品易产生线残像的问题进行研究,考察了不同驱动信号电压及反转方式与线残像之间的关系。结果表明,通过减小驱动信号线电压,或提高驱动信号的反转频率,均可降低公共电极与信号线的耦合程度。当灰阶电压由L255减小为L46,耦合电压幅值由240 mV降为34.8 mV;当驱动信号方式由帧反转变为点反转时,耦合电压幅值由112.6 mV降为63.1 mV,有效地改善了线残像,并利用德拜弛豫公式分析了驱动信号反转对线残像的作用机理,为线残像的分析和改善提供了理论依据和解决方向。
Abstract
We investigated the relationship between line image sticking with different drive signal voltages and their inversion modes, because TFT-LCD easily produces line image sticking. The result shows that line image sticking and the coupling between common electrodes and data lines can be reduced by decreasing the drive signal voltage, or increasing the inverse-frequency of drive signal. When the gray level voltage is reduced from L255 to L46, the coupling voltage amplitude is reduced from 240 mV to 34.8 mV. When the driving signal changed from frame inversion to point inversion, the coupling voltage amplitude decreased from 112.6 mV to 63.1 mV. We also analyzed the mechanism of the inversion mode of drive signal on line image sticking by using Debye relaxation formula. The solution and theoretical basis were established for line image sticking by the research.
林琳琳, 张洪林, 林鸿涛, 贠向南, 陈曦, 赖意强, 吴洪江, 刘耀, 庄子华, 李大海. TFT-LCD中驱动信号与线残像的关系研究[J]. 液晶与显示, 2018, 33(5): 375. LIN Lin-lin, ZHANG Hong-lin, LIN Hong-tao, YUN Xiang-nan, CHEN Xi, LAI Yi-qiang, WU Hong-jiang, LIU Yao, ZHUANG Zi-hua, LI Da-hai. Relationship between line image sticking and drive signal in TFT-LCD[J]. Chinese Journal of Liquid Crystals and Displays, 2018, 33(5): 375.