Computer graphics processing and selective visual display system – Display driving control circuitry – Controlling the condition of display elements
Patent
1992-03-30
1995-06-27
Powell, Mark R.
Computer graphics processing and selective visual display system
Display driving control circuitry
Controlling the condition of display elements
395131, 345114, 345201, G06F 1562
Patent
active
054287430
ABSTRACT:
A multiple-plane frame buffer is effectively accessed which is provided in a video signal generator in a raster-scan type computer system. The video signal generator further includes a video controller preceded by the multiple-plane frame buffer. The video controller receives multiple-bit-per-pixel data from the multiple-plane frame buffer and applies three primary analog data to a raster-scan display. There is provided a pixel data writing controller which is arranged to store a first multiple-bit-per-pixel data defining each color of image pixels and a second multiple-bit-per-pixel data defining each color of background pixels. The pixel data writing controller selectively applies one of the first and second multiple-bit-per-pixel data to the multiple-plane frame buffer in response to a control signal applied thereto.
REFERENCES:
patent: 4016544 (1977-04-01), Morita et al.
patent: 4520358 (1985-05-01), Makino
patent: 4789963 (1988-12-01), Takahashi et al.
patent: 4825381 (1989-04-01), Bottorf et al.
patent: 4908779 (1990-03-01), Iwata
NEC Corporation
Powell Mark R.
Tung Kee M.
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