Liquid crystal display having grey levels with reduced variation

Details Liquid crystal display having grey levels with reduced variation Liquid crystal display having grey levels with reduced variation

1997-02-18

2000-05-09

Saras, Steven J.

Computer graphics processing and selective visual display system

Plural physical display element control system

Display elements arranged in matrix

345149, 349 96, G09G 336

Patent

active

060610433

ABSTRACT:
A liquid crystal display which includes a matrix of pixels, for instance formed at the intersections of data electrodes and split strobe electrodes. Each pixel is divided into first and second sub-pixels. The first sub-pixels have input and output polarisers whose polarization directions are parallel, whereas the second sub-pixels have input and output polarisers whose polarization directions are orthogonal. In order to address and achieve grey levels with reduced variations due to temperature variations and liquid crystal variations, the sub-pixels are switched to a grey level in accordance with a spatial averaging technique. Variations in the grey levels of the sub-pixels, for instance caused by temperature variations, act in opposite directions so that the average grey level of the whole pixel varies relatively little.

REFERENCES:
patent: 5235449 (1993-08-01), Imazeki et al.
patent: 5327285 (1994-07-01), Faris
patent: 5675351 (1997-10-01), Kaneko et al.
patent: 5686975 (1997-11-01), Lipton
patent: 5717522 (1998-02-01), Hattori et al.
patent: 5751479 (1998-05-01), Hamagishi et al.
European Search Report related to European Patent Application No. 97301054.9 dated Sep. 10, 1998.

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