| US 7,484,112 B2 | ||
| Power management in a display controller | ||
| Ali Noorbakhsh, Danville, Calif. (US); David Keene, Corrales, N. Mex. (US); John Lattanzi, Palo Alto, Calif. (US); and Ram Chilukuri, San Jose, Calif. (US) | ||
| Assigned to Genesis Microchip Inc., Santa Clara, Calif. (US) | ||
| Filed on Feb. 18, 2005, as Appl. No. 11/60,917. | ||
| Claims priority of provisional application 60/620094, filed on Oct. 18, 2004. | ||
| Prior Publication US 2006/0082569 A1, Apr. 20, 2006 | ||
| Int. Cl. G06F 1/26 (2006.01) | ||
| U.S. Cl. 713—340 [713/322; 345/52] | 17 Claims |
| 1. A method of managing power in a display controller having an on-board power supply coupled to a host device having an off-board
power supply by way of a connector, comprising:
determining if the on-board power supply is active;
when it is determined that the on-board power supply is not active, then
providing power to the display controller by the off-board power supply by way of the connector;
turning on a low frequency clock arranged to provide a low frequency clock signal;
when it is determined that the on-board power supply is active, then
providing power to the display controller by the on-board power supply only once the display controller finishes partially
completed display controller operations;
turning off the low frequency clock;
turning on a high frequency clock arranged to provide a high frequency clock signal;
wherein the display controller remains fully operational regardless of changes in the state of the on-board power supply.
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