Gray shade driver for pixel array

Details Gray shade driver for pixel array Gray shade driver for pixel array

1997-07-12

1999-10-19

Le, N.

Incremental printing of symbolic information

Light or beam marking apparatus or processes

Scan of light

347240, 358298, B41J 2435

Patent

active

059697458

ABSTRACT:
A pixel array driver for applying gray level voltages to a group of pixels without the use of a ramp voltage generator employs an integrated circuit arrangement which multiplexes a plurality of discrete gray level voltages in staircase fashion onto a high-voltage bus, identifies each of the discrete voltages appearing on the high-voltage bus with a code word applied to a code word bus, and matches for each pixel the word on the code word bus to a previously stored data word that designates the gray level intensity voltage desired at the pixel. When the code word and the data word match, the pixel is disconnected from the high-voltage bus. Each pixel is provided with a sample and hold circuit to maintain the value of voltage reached after being disconnected from the high-voltage bus.

REFERENCES:
patent: 4750010 (1988-06-01), Ayers et al.
patent: 5266936 (1993-11-01), Saitoh
patent: 5541629 (1996-07-01), Saunders et al.

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