Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1995-12-27
1998-09-29
Hjerpe, Richard A
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345 87, 345100, 345147, 359264, G09G 336
Patent
active
058151281
ABSTRACT:
A liquid crystal display panel gray shade driving device comprises first circuitry for applying row signals represented by a set of orthonormal functions to a group of row electrodes throughout one frame by set sequential scanning for each of selecting periods, and second circuitry for sequentially carrying out a dot product computation between the set of orthonormal functions and a set of pixel data consisting of bits, and applying a column signal having a voltage level corresponding to a result of the computation to each of a group of column electrodes in synchronization with the set sequential scanning for each of the selecting periods. The first circuitry has a vertical driver for applying the row signal, by doubling the rate thereof, to the group of row electrodes and repeating the same set sequential scanning at least for two frames of previous and subsequent frames. The second circuitry has a frame memory for holding the pixel data in each frame while dividing it according to a significance of each bit and a dot product computing circuit for reading out the set of held pixel data per significance of each bit and carrying out the dot product computation to generate a column signal component corresponding to the significance of each bit. A horizontal driver divides the column signal components into a significant bit component and a less significant bit component, and distributes one component to the previous frame and the other to the subsequent frame to generate a column signal which is applied to the group of column electrodes.
REFERENCES:
patent: 5420604 (1995-05-01), Scheffer et al.
patent: 5473338 (1995-12-01), Prince et al.
patent: 5485173 (1996-01-01), Scheffer et al.
patent: 5532713 (1996-07-01), Okada et al.
patent: 5621425 (1997-04-01), Hoshino et al.
Hoshino Masafumi
Matsu Fujio
Yamamoto Shuhei
Hjerpe Richard A
Osorio Ricardo
Seiko Instruments Inc.
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