New method for extracting the capacitance-voltage characteristics of an active-matrix liquid crystal display and its application to overdrive technology

Mohamed Obaej Tareq; Kang Song; Yongmin Cho; Achintya K. Bhowmik; Seung-Woo Lee

doi:10.1117/1.3158945

1 July 2009 New method for extracting the capacitance-voltage characteristics of an active-matrix liquid crystal display and its application to overdrive technology

Mohamed Obaej Tareq, Kang Song, Yongmin Cho, Achintya K. Bhowmik, Seung-Woo Lee

Author Affiliations +

Optical Engineering, Vol. 48, Issue 7, 074001 (July 2009). https://doi.org/10.1117/1.3158945

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.

©(2009) Society of Photo-Optical Instrumentation Engineers (SPIE)

Citation Download Citation

Mohamed Obaej Tareq, Kang Song, Yongmin Cho, Achintya K. Bhowmik, and Seung-Woo Lee "New method for extracting the capacitance-voltage characteristics of an active-matrix liquid crystal display and its application to overdrive technology," Optical Engineering 48(7), 074001 (1 July 2009). https://doi.org/10.1117/1.3158945

Published: 1 July 2009

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