Television – Basic receiver with additional function – For display of additional information
Reexamination Certificate
2000-10-04
2002-09-17
Kostak, Victor R. (Department: 2611)
Television
Basic receiver with additional function
For display of additional information
C348S564000
Reexamination Certificate
active
06452641
ABSTRACT:
FIELD OF THE INVENTION
The invention relates generally to digital data processing, and more particularly, to digital data processing associated with on-screen displays.
BACKGROUND OF THE INVENTION
Many conventional on-screen display (OSD) techniques disadvantageously require high resolution processing for an entire screen if any part of the screen requires high resolution processing. For example, Table 1 shows the number of bytes required to store a full screen picture 720 pixels×576 lines in different display modes for an OSD system that does not allow mixing of several modes of display in real time on the same screen. When one part of the screen requires 256 colors, the full screen must be 256 colors, even if another part of the screen requires only 2 colors.
TABLE 1
Number of Byte for Full Screen Display
Display mode
Number of bytes full
Bit map 1-bit per pixel
51,840
Bit map 2-bit per pixel
103,680
Bit map 4-bit per pixel
207,360
Bit map 8-bit per pixel
414,720
4:4:4 graphic plane
1,244,160
4:2:2 video mode
829,440
4:2:0 video mode
622,080
The present invention provides for on-screen display with a variable resolution capability that advantageously permits respective parts of a screen to be processed according to their respective resolution requirements, thereby reducing the processing power and memory required to produce the on-screen display. In particular, for any active window in the on-screen display, the invention can determine the data format used in memory to represent the pixels of that window, thereby permitting the window resolution to vary from window to window.
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Benbassat Gerard
Chae Brian O.
Chauvel Gerard
Brady III W. James
Kostak Victor R.
Laws Gerald E.
Telecky , Jr. Frederick J.
Texas Instruments Incorporated
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