Patent ID: 6072451
Filing Date: 2000-06-06
Classification: G09G

Abstract:
A liquid-crystal halftone display system comprising:a data driver which receives liquid-crystal display data corresponding to input display data representing any of display-ON, display-OFF and a halftone display for each of a plurality of pixels for one line, and which outputs said liquid-crystal display data for one line as horizontal display data;a scan driver which designates a line of a liquid-crystal panel for displaying said horizontal display data;a liquid-crystal panel which displays said horizontal display data as visible information on the line designated by said scan driver;a line memory in which the input display data is stored for at least one line; andhalftone pattern generating means for generating said liquid-crystal display data to be received by said data driver by the use of contents of said line memory and the input display data;wherein said halftone pattern generating means includes:ON data generating means for generating ON data in response to the input display data which represents said display-ON for a pixel;OFF data generating means for generating OFF data in response to the input display data which represents said display-OFF for a pixel;halftone data generating means for generating ON data and OFF data alternately in successive frames as halftone data in response to the input display data which represents the halftone display for a pixel;comparing means for comparing the input display data for a pertinent line with the input display data for a preceding line stored in said line memory for every line, the preceding line being in a same frame as the pertinent line; andinverting means for inverting a phase of changing-over said ON data and said OFF data of said halftone data in accordance with an output of said comparing means.