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US 6,310,657 B1Granted
Real time window address calculation for on-screen display
AssigneeTexas Instruments Incorporated
InventorsGerard Chauvel, Serge Lasserre, Mario Giani, Tiemen Spits, Gerard Benbassat, Frank L. Laczko, Sr., Y. Paul Chiang, Karen L. Walker, Mark E. Paley, Brian O. Chae
Life of this patent
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Abstract
An on-screen display system in which a CPU generates windows in a working memory space also provides for real time calculation of window addresses in the working memory space. This can eliminate the need for a separate frame buffer memory.
Claims14
An on-screen display apparatus, comprising:
- a data processor for generating a plurality of windows for on-screen display;
- a memory coupled to said data processor for receiving therefrom and storing window information representative of said windows;
- and
- an on-screen display controller coupled to said memory, said on-screen display controller having an input for receiving information indicative of a current display line of the on-screen display, said on-screen display controller responsive to said current display line information for identifying segments of said windows that are to be displayed on said current display line and for obtaining from said memory portions of said window information that respectively represent said identified segments for use in producing said current display line, said on-screen display controller further comprising:
- a windows controller for providing positional information indicative of respective positions of said windows in the on-screen display, said on-screen display controller responsive to said positional information for identifying said segments;
- and
- an address calculator coupled to said windows controller and responsive to said positional information for determining addresses for respectively accessing said information portions in said memory, wherein said address calculator is further responsive to said positional information for calculating sizes of the respective information portions.
4 more elements
An on-screen display method, comprising:
- generating a plurality of windows for on-screen display;
- storing in a memory window information representative of said windows;
- providing information indicative of a current display line of the on-screen display;
- and
- providing positional information indicative of respective positions of said windows in the on-screen display;
- and
- responsive to said current display line information, identifying segments of said windows that are to be displayed on said current display line, identifying said segments in response to said positional information, obtaining from said memory portions of said window information that respectively represent said identified segments for use in producing said current display line determining in response to said positional information addresses for respectively accessing said information portions in said memory, and calculating sizes of the respective information portions in response to said positional information.
4 more elements
Dependencies are inferred from the claim text.