Method and apparatus for on-the-fly multiple display mode switch

Details Method and apparatus for on-the-fly multiple display mode switch Method and apparatus for on-the-fly multiple display mode switch

1993-10-19

1995-12-05

Hjerpe, Richard

Computer graphics processing and selective visual display system

Display peripheral interface input device

Light pen for fluid matrix display panel

345150, 345199, 345186, G09G 102

Patent

active

054733421

ABSTRACT:
A RAMDAC circuit drives a display device so as display multiple modes of color depth and display resolution in a single display frame without sacrificing resolution of the higher-resolution mode, and adjusts the output pixel rate to match that of the display mode being display on a pixel-by-pixel basis. The RAMDAC circuit switches between two graphics modes on-the-fly on a pixel-by-pixel basis in accordance with mode control bits stored in the pixel data. Furthermore, the RAMDAC circuit switches between two output pixel rates such that the amount of video memory used for any predefined screen area remains constant even though the output pixel rate and resolution are dynamically adjusted. In a preferred embodiment a display mode signal is embedded in the display data such that the display data, including the mode signal, comprises one byte of data for each display pixel when the mode signal specifies the first display mode, and comprises two bytes of data for each display pixel when the mode signal specifies the second display mode.

REFERENCES:
patent: 4979738 (1990-12-01), Frederiksen
patent: 5086295 (1992-02-01), Boettcher et al.
patent: 5128658 (1992-07-01), Pappas et al.
patent: 5189401 (1993-02-01), Kugler, Jr. et al.
patent: 5258826 (1993-11-01), Wakeland et al.
"IMG G174 high colour palette-DAC with PixMix"; INMOS Limited, a member of the SGS-THOMSON Microelectronics Group; Nov. 1991; #42 1543 00.

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