Computer graphics processing and selective visual display system – Display peripheral interface input device – Light pen for fluid matrix display panel
Patent
1996-11-04
1999-10-12
Powell, Mark R.
Computer graphics processing and selective visual display system
Display peripheral interface input device
Light pen for fluid matrix display panel
345100, 345121, G09G 116
Patent
active
059661151
ABSTRACT:
There are provided a drive unit which can be adjusted to various mounting forms and which can be reduced in power consumption and scale, and an electronic equipment containing such a drive unit. When a control signal DIR is switched from L-level to H-level, a logical operation circuit comprising a plurality of logic gates changes a READ address A which is in turn outputted toward a display memory. More particularly, an inverted signal of the READ address A is outputted as a READ address B. Thus, an image displayed on a liquid crystal display panel is vertically inverted. The drive unit can be adjusted to various mounting forms for the liquid crystal display device. Where the display memory includes a code data memory and a CG-ROM, first and second logical operation circuits are provided for each of the code data memory and CG-ROM. The output of the CG-ROM is connected to a third logical operation circuit which performs the lateral inversion for each character. The vertical and lateral inversion can also be accomplished by providing a decoder which outputs a latch signal at different timing at each time when the control signal DIR is switched from one level to another.
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Kovalick Vincent E.
Powell Mark R.
Seiko Epson Corporation
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