Computer graphics processing and selective visual display system – Display peripheral interface input device – Light pen for fluid matrix display panel
Patent
1991-05-06
1994-03-01
Oberley, Alvin E.
Computer graphics processing and selective visual display system
Display peripheral interface input device
Light pen for fluid matrix display panel
345152, G09G 102
Patent
active
052911870
ABSTRACT:
A graphics subsystem, including a video digital-to-analog converter, is disclosed. A high speed oscillator generates a pixel clock signal at the frequency at which pixels are to be displayed. Included in the video DAC is a frequency divider which presents an output clock signal having a period which is a multiple of the pixel clock signal, the multiple corresponding to the level of multiplexing of pixel data to be provided by the video DAC; this multiple can equal unity. The video controller in the system receives the output clock signal, and generates clock signals to control the serial port of the frame memory, and also to control the latching of the first stage in the video DAC. The first stage latch in the video DAC latches in the multiple pixel data from the frame memory, and the multiplexer in the video DAC presents the data to the color palette RAM, or around the color palette RAM in true-color non-multiplexed mode, according to the pixel clock signal. As a result, the pixel clock rate is not dependent by the propagation delay of the output clock signal through the video controller, and higher speed system operation is achieved.
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Product Selection Guide (Brooktree Corporation, 1991), pp. 13-14.
Bounds Brian F.
Wood Paul B.
Compaq Computer Corporation
Oberley Alvin E.
Wu Xiao M.
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