| (19) |
 |
|
(11) |
EP 0 508 626 A3 |
| (12) |
EUROPEAN PATENT APPLICATION |
| (88) |
Date of publication A3: |
|
21.04.1993 Bulletin 1993/16 |
| (43) |
Date of publication A2: |
|
14.10.1992 Bulletin 1992/42 |
| (22) |
Date of filing: 20.03.1992 |
|
| (51) |
International Patent Classification (IPC)5: G09G 5/06 |
|
| (84) |
Designated Contracting States: |
|
AT BE CH DE DK ES FR GB GR IT LI LU NL PT SE |
| (30) |
Priority: |
12.04.1991 US 685263
|
| (71) |
Applicant: ADVANCED MICRO DEVICES, INC. |
|
Sunnyvale, CA 94088 (US) |
|
| (72) |
Inventors: |
|
- Arcuri, Salvatore
Dublin,
California 94566 (US)
- Levy, Roy J.
Ashland,
Oregon 975520 (US)
|
| (74) |
Representative: Wright, Hugh Ronald et al |
|
Brookes & Martin
High Holborn House
52/54 High Holborn
London WC1V 6SE
London WC1V 6SE (GB) |
|
| |
|
| (54) |
Color palette circuit |
(57) Color palette circuits are disclosed which utilize first and second color look-up
tables which use information from a video bit map to address storage locations in
the look-up tables, and then combine the information stored in the selected storage
locations using digital adder or digital multiplier circuits, the resulting combined
signals are then converted to analog signals, which may be used to generate color
pixels. The use of a combining means permits the generation of a greater number of
displayable colors than the sum of the number of storage locations in the look-up
tables.