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Optical Engineering

New method for extracting the capacitance-voltage characteristics of an active-matrix liquid crystal display and its application to overdrive technology
Author(s): Mohamed Obaej Tareq; Kang Song; Yongmin Cho; Achintya K. Bhowmik; Seung-Woo Lee
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Paper Abstract

We propose a new technique to extract the steadystate capacitance-voltage (C-V) characteristics of an active-matrix liquid crystal display (AMLCD) using its transient luminance responses. We show how to determine the capacitance of pixels in an AMLCD using the charge conservation law in a pixel and the one-to-one relation between the luminance and capacitance of LC molecules. The C-V data extracted at the ends of the first and second frame times match very well with each other, which confirms that our technique is valid. By using the extracted C-V data, we calculate overdrive voltage values according to transitions. The results show that the overdrive voltages have a linear relation with the transition voltage difference. The linear characteristics can help the overdrive hardware to be extremely simple. The ease of implementation of the overdrive technology with the linear voltage relation should facilitate further adoption and expansion of LCD products with faster response times.

Paper Details

Date Published: 1 July 2009
PDF: 5 pages
Opt. Eng. 48(7) 074001 doi: 10.1117/1.3158945
Published in: Optical Engineering Volume 48, Issue 7
Show Author Affiliations
Mohamed Obaej Tareq, Kyung Hee Univ. (Korea, Republic of)
Kang Song, Kyung Hee Univ. (Korea, Republic of)
Yongmin Cho, Kyung Hee Univ. (Korea, Republic of)
Achintya K. Bhowmik, Intel Corp. (United States)
Seung-Woo Lee, Kyung Hee Univ. (Korea, Republic of)

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