Incremental printing of symbolic information – Light or beam marking apparatus or processes – Scan of light
Patent
1998-06-11
1999-11-23
Le, N.
Incremental printing of symbolic information
Light or beam marking apparatus or processes
Scan of light
347240, 347247, 347237, 358443, 358444, 358448, 358455, H04N 140
Patent
active
059909226
ABSTRACT:
An image signal processor of a printer is provided. The image signal processor of the printer includes a first memory, a second memory, a multiplexer for selectively and alternately outputting image data to the first memory and the second memory according to a memory select signal, a printer controller for outputting the memory select signal and the image data representing gray scales in a pixel by a predetermined number of gray scale representation bits to the multiplexer, a memory controller controlled by the printer controller for controlling the data output of the first memory and the second memory so that as much image data as the number of gray scale representation bits is alternately output from the first memory and the second memory, a data converter controlled by the printer controller for converting an amount of image data equal to the number of the gray scale representation bits into drive data represented by a set number of bits and outputting the image data, a data repeater for repeating the transfer of the image data alternately output from the first memory and the second memory to the data converter according to the memory select signal, and a drive signal generator for receiving the drive data and driving an optical scanning unit. According to the image signal processor, the time required for transferring data is reduced for image data of lower resolution displayed by gray scales of binary data of less than eight bits such as four bits or two bits than in image data of higher resolution displayed by gray scales of binary data of eight bits in a pixel due to a smaller amount of information to be transferred.
REFERENCES:
patent: 5586227 (1996-12-01), Kawana et al.
patent: 5809216 (1998-09-01), Ng
Le N.
Pham Hai C.
Samsung Electronics Co,. Ltd.
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