Computer graphics processing and selective visual display system – Plural physical display element control system – Segmented display elements
Patent
1997-09-17
1999-12-21
Mengistu, Amare
Computer graphics processing and selective visual display system
Plural physical display element control system
Segmented display elements
345116, G09G 304
Patent
active
060055375
ABSTRACT:
The liquid-crystal display control apparatus provided by the present invention comprises a display RAM unit 21 for storing character codes, character-generator RAM and ROM units 22 and 23 for storing character font patterns and a segment RAM unit 24 for storing picture patterns such as marks and icons. When displaying a character, the following display control is carried out. First of all, a character code is read out from the display RAM unit 21 at a display address generated by a display-address counter 25. The character code is then used in conjunction with a raster address output by a line-address counter 26 for reading out a character font pattern from the character-generator RAM unit 22 or the character-generator ROM unit 23. When displaying a picture pattern such as a mark or an icon, on the other hand, the following display control is carried out. Display control information is read out from the segment RAM unit 24 at an address generated by the display-address counter 25. Dot-matrix characters and picture patterns such as marks and icons are displayed on the same screen on a time-division basis.
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HD44780 Hitachi User's Manual, Feb. 1984, pp. 1-12. (Provided in Japanese with English translation attached.).
Sugiyama Kimihiko
Tsunekawa Satoru
Yokota Yoshikazu
Hitachi , Ltd.
Hitachi Device Engineering Co., Ltd
Mengistu Amare
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