Journal
IEEE TRANSACTIONS ON CONSUMER ELECTRONICS
Volume 54, Issue 3, Pages 1459-1464Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TCE.2008.4637641
Keywords
uniformity; LCD TV; kickback; multi-point drive; V-com
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A multi-point drive of a common electrode is presented to improve the uniformity of a large-sized liquid crystal display television (LCD-TV). A current drivability of a switching transistor, line delays at both gate and data lines, and a kickback in a pixel are found to be main factors to affect the uniformity of the pixel voltage. A comparison between a single-gate scheme and a dual-gate scheme is given to understand the pixel voltage drop across the whole 40-inch screen. To compensate the uneven voltage drop across the screen, common electrode should be applied by several different voltage sources at different locations. This is the multi-point drive of the common electrode. This work presents valuable analysis results to designers developing highly-uniform LCD-TV panels with large sizes.
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