Computer graphics processing and selective visual display system – Plural physical display element control system – Display elements arranged in matrix
Patent
1994-05-25
1995-12-05
Chin, Tommy P.
Computer graphics processing and selective visual display system
Plural physical display element control system
Display elements arranged in matrix
345116, 345155, 348589, 348564, G09G 100
Patent
active
054733413
ABSTRACT:
When a display control apparatus displays an 8-bit graphics data item and a 4-bit text data item, superimposed upon each other, on a display device which has pixels each having two dots it outputs, for one of the two dots an 8-bit text data item obtained by combining the 4-bit text data item with a 4-bit fixed data item, and outputs the 8-bit graphics data item for the other of the two dots. The display control apparatus has a multiplexer for outputting in order the upper 4 bits and lower 4 bits of the 8-bit graphics data item, each time a time period for displaying one dot elapses, a delaying circuit connected to the multiplexer, for generating delayed data items FG1 and FG2 by delaying the output GX of the multiplexer by a time period for displaying one dot and by a time period for displaying two dots, respectively, and a selection/output circuit. The selection/output circuit outputs the 8-bit text data for a first one of the two dots, and outputting, for a second one of the two dots, a data item obtained by combining the data items FG2 and FG1. Or, the selection/output circuit outputs, for the first dot, a data item obtained by combining the data items FG1 and GX, and outputs the 8-bit text data item for the second dot.
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patent: 4888582 (1989-12-01), Schnarel
patent: 4965670 (1990-10-01), Klinefelter
patent: 5132670 (1992-07-01), Miller
Au A
Chin Tommy P.
Kabushiki Kaisha Toshiba
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