Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1994-12-27
1997-04-08
Tung, Kee M.
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345 89, 345 94, 345148, G09G 336
Patent
active
056192240
ABSTRACT:
In order to prevent signal distortion using a multiple line selection driving technique when using pulse width modulation to achieve a half-tone display in a liquid crystal display panel, respective bits of column signals are arranged in a descending pulse width order and a voltage generating circuit is used to lower level differences in adjacent bits. An orthonormal function generating circuit generates a plurality of row signals to drive a group of row electrodes through a vertical driver. A dot product computation circuit computes a dot product of the orthonormal functions and pixel display data to generate a column signal in the above manner. A horizontal driver applies the column signal to a group of column electrodes. Pixel data is stored in a frame memory, each datum being represented by a series of bits corresponding to a gray scale. The dot product computation circuit divides the pixel data into the respective bits, and individually carries out the dot product computation for each bit. The horizontal driver arranges the column signal components in order of descending pulse width. A voltage level circuit lowers the voltage level between the column components to reduce distortion caused by the high switching speed between the components and the low response time of the liquid crystal material.
REFERENCES:
patent: 5122791 (1992-06-01), Gibbons et al.
patent: 5459495 (1995-10-01), Scheffer et al.
Proceedings of the Twelfth International Display Research Conference Japan Display '92, Oct. 12-14, 1992 pp. 69-72, A.R. Conner et al., "Pulse-Height Modulation (PMH) Gray Shading Methods for Passive Matrix LCD's".
Ebihara Teruo
Fujita Hiroyuki
Hoshino Masafumi
Matsu Fujio
Oniwa Hirotomo
Chow Doon
Seiko Instruments Inc.
Tung Kee M.
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