Contrast Enhancement in Liquid Crystal Displays by Adaptive Modification of Analog Gamma Reference Voltages

Seung-Woo LEE  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E90-C   No.11   pp.2083-2087
Publication Date: 2007/11/01
Online ISSN: 1745-1353
DOI: 10.1093/ietele/e90-c.11.2083
Print ISSN: 0916-8516
Type of Manuscript: Special Section PAPER (Special Section on Electronic Displays)
Category: 
Keyword: 
LCD,  contrast enhancement,  image quality,  dynamic gamma control,  

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Summary: 
In this paper, I propose dynamic gamma control (DGC) as a new contrast enhancement technology for liquid crystal displays. Unlike conventional technologies involving the manipulation of digital image data, DGC modifies analog gamma reference voltages in accordance with the image data distribution. A digital gamma buffer (DGB) and a new system architecture were developed for DGC implementation. Experimental results show that DGC can increase the contrast ratio of 5 images twofold on average.