16 May 2003 LCD gamma correction by nonlinear digital-to-analogue converter
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Abstract
The non-linear transmission / voltage characteristic of the pixels of a liquid crystal display (LCD) must be corrected for during the digital-to-analogue conversion of image data. This process of gamma correction is conventionally performed by a combination of a digital look-up table and a linear digital-to-analogue converter (DAC) with a bit resolution, m, greater than the bit depth, n, of the digital image (m>n). We present a new method of LCD gamma correction based upon a carefully optimised non-linear DAC with a bit resolution of only n. By reducing DAC complexity we are able to reduce circuit area and move towards our vision of a fully integrated CGS, system-on-panel LCD.
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Harry G. Walton, Harry G. Walton, Michael Brownlow, Michael Brownlow, Jeremey Lock, Jeremey Lock, Mouhamed Rahal, Mouhamed Rahal, Patrick Zebedee, Patrick Zebedee, } "LCD gamma correction by nonlinear digital-to-analogue converter", Proc. SPIE 5004, Poly-Silicon Thin Film Transistor Technology and Applications in Displays and Other Novel Technology Areas, (16 May 2003); doi: 10.1117/12.482576; https://doi.org/10.1117/12.482576
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