Computer graphics processing and selective visual display system – Computer graphic processing system
Reexamination Certificate
1997-11-14
2001-01-23
Chauhan, Ulka J. (Department: 2776)
Computer graphics processing and selective visual display system
Computer graphic processing system
C345S156000, C345S504000, C345S003100, C345S005000
Reexamination Certificate
active
06177946
ABSTRACT:
TECHNICAL FIELD OF THE INVENTION
The present invention relates generally to video graphics processing and more particularly to processing video data and graphics data without redundant format conversions.
BACKGROUND OF THE INVENTION
Computers arc known to include a central processing unit (“CPU”), video graphics processing circuitry, cache memory, floppy disk memory, hard drive memory, and peripheral input/output ports, which allow peripheral devices such as a CRT display (or monitor), printer, etc. to be coupled to the computer. In addition, some computers may include a television encoder, such that the computer can receive and display television signals. Such television signals include broadcast television, cable television, satellite television VCR (videocassette recorder) transmissions, and/or DVD video transmissions.
FIG. 1
illustrates a portion of such a computer system
10
that includes a graphic controller
12
and a TV encoder
14
. The graphics controller
12
controls the processing of video information that is to be presented on the computer monitor
28
, while the TV encoder
14
generates video outputs such as composite video
30
, S video Y
32
, and S video C
34
for display on a television. The graphics controller
12
includes video circuitry
16
and a digital to analog converter (DAC)
18
. The video circuitry
16
receives video inputs
26
that are in the Y,Cb,Cr format and converts the input
26
into RGB (Red, Green, Blue) data, which may be 16 or 24 bits in length. The video circuit
16
may also scale the video inputs
26
prior to converting them to RGB data. The DAC
18
converts the digital 8 bit RGB data into analog signals such that they may be displayed on the monitor
28
.
The TV encoder, upon receiving the eight bit RGB data, converts the data into YUV data via an RGB to YUV converter
20
. The converted data is then scaled by a scaling circuit
22
and converted to an analog signal by the digital to analog converter
24
. In such a system, the video input
26
is converted to a RGB graphics data format and then reconverted to a YUV video format. Such conversions reduce the video quality of video signals being presented at the video outputs
30
,
32
and
34
. In addition to the redundant format conversions, the circuit of
FIG. 1
requires two circuits to process video data and graphics data. In laptop computer applications, the multiple circuit approach of
FIG. 1
requires additional real estate, which adds to the overall size of the laptop computer.
Therefore, a need exists for a method and apparatus that integrates video data processing and graphics data processing without redundant format conversions.
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patent: 5712688 (1998-01-01), Eglit
patent: 5754170 (1998-05-01), Ranganathan
patent: 5764201 (1998-06-01), Ranganathan
patent: 5784050 (1998-07-01), Corry
patent: 5808630 (1998-09-01), Pannell
patent: 5815634 (1998-09-01), Daum et al.
patent: 5877741 (1999-03-01), Chee et al.
patent: 5929924 (1999-07-01), Chen
patent: 5963192 (1999-10-01), Wong et al.
patent: 5977960 (1999-11-01), Nally et al.
patent: 5986676 (1999-11-01), Dwin et al.
Hall Oswin
Sinclair David Edward
ATI Technologies Inc.
Chauhan Ulka J.
Markison & Reckamp, P.C.
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