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Gray Tracking Correction for TFT-Lcds

机译:TFT-LCD的灰色跟踪校正

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摘要

The consistency of the white point with the input gray level is referred in the world of display technology as gray tracking. Gray tracking is an issue for Twisted Nematic (TN) TFT-LCD screens which typically show a bluish shift of the white point when the gray level decreases. This paper discusses some causes of the colorcast in TN displays and proposes a method for correcting it by using the existing video card look-up tables (VLUT) in the graphic controller or in the panel itself. The correction process performs the gamma correction and the gray tracking correction simultaneously. The gray tracking correction uses the luminance and the chrominance information of the R, G, B channels. For a single VLUT entry, for the corresponding output value in one channel (G for example), the method computes the output values for the other two channels (R and B respectively) such that, the resulted gray has the minimum chromatic difference to the desired white point of the display. The method proves to remove the colorcast in the TN TFT-LCD screens. The method is general and can be applied to any display technology.
机译:在显示技术领域中,白点与输入灰度级的一致性被称为灰度跟踪。对于扭曲向列(TN)TFT-LCD屏幕,灰度跟踪是一个问题,当灰度级降低时,通常会显示出白点的蓝移。本文讨论了TN显示器中色偏的一些原因,并提出了一种使用图形控制器或面板本身中现有的视频卡查找表(VLUT)进行校正的方法。校正处理同时执行伽马校正和灰度跟踪校正。灰度跟踪校正使用R,G,B通道的亮度和色度信息。对于单个VLUT条目,对于一个通道(例如G)中的相应输出值,该方法将计算其他两个通道(分别为R和B)的输出值,从而使所得的灰度值与色差最小。显示屏所需的白点。事实证明,该方法消除了TN TFT-LCD屏幕上的色偏。该方法是通用的,可以应用于任何显示技术。

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