Back to articles
Volume: 10 | Article ID: art00051
Gray Tracking Correction for TFT-Lcds
  DOI :  10.2352/CIC.2002.10.1.art00051  Published OnlineJanuary 2002

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.

Subject Areas :
Views 5
Downloads 0
 articleview.views 5
 articleview.downloads 0
  Cite this article 

Gabriel Marcu, Kok Chen, "Gray Tracking Correction for TFT-Lcdsin Proc. IS&T 10th Color and Imaging Conf.,  2002,  pp 272 - 276,

 Copy citation
  Copyright statement 
Copyright © Society for Imaging Science and Technology 2002
Color and Imaging Conference
color imaging conf
Society of Imaging Science and Technology
7003 Kilworth Lane, Springfield, VA 22151, USA