On-screen display format reduces memory bandwidth for on-screen display systems
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United States of America Patent
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May 27, 2003
Grant Date -
N/A
app pub date -
Jun 26, 1998
filing date -
Jun 26, 1998
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A video system is disclosed that processes OSD images and displays the OSD images on a display. At least some of the OSD images are represented by data sets that do not include a color palette. Each OSD data set includes a header comprising multiple bits of status and control information. One of the control bits indicates whether the OSD data set includes a color palette. Preferably that control bit is set to indicate no color palette in present and cleared to indicate the inclusion of a color palette in the OSD data set. By not including a color palette in an OSD data set, the corresponding OSD image can be represented with a smaller data set and can be transferred across a bus with a smaller bandwidth. If the control bit is set, indicating the absence of a color palette in the OSD data set, a color palette included in another OSD data set is used instead to draw the desired OSD image.
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