Computer graphics processing and selective visual display system – Plural display systems – Diverse systems
Patent
1994-06-10
1995-12-26
Brier, Jeffery
Computer graphics processing and selective visual display system
Plural display systems
Diverse systems
G09G 512
Patent
active
054791839
ABSTRACT:
An optional display detecting apparatus is used in a computer system which has a flat panel display serving as a standard display unit and allows a CRT display serving as an optional display unit to be connected thereto. The apparatus includes a data replacing circuit for selecting a predetermined one of color registers in a digital-to-analog converter (DAC) and replacing color data stored in the selected color register with the test color data upon power-on of the computer system, and a voltage detector for comparing voltage levels at output terminals of the DAC with a reference level to determine whether the CRT display is connected thereto. A display controller drives a display unit selected according to comparison result from the voltage detector.
REFERENCES:
patent: 5072411 (1991-12-01), Yamaki
patent: 5138700 (1992-08-01), Kinoshita
patent: 5140693 (1992-08-01), Ninomiya
patent: 5159683 (1992-10-01), Lvovsky et al.
Western Digital, "WD90C26A Integrated Low Power VGA LCD Controller with Simultaneous Display", (1992), pp. 160-161.
Brier Jeffery
Kabushiki Kaisha Toshiba
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