(12) United States Patent (io) Patent No.: US 6,822,645 B2
Noritake et al. (45) Date of Patent: Nov. 23,2004
English and Japanese Translation ol Taiwan Office Action ol Nov. 13, 2003 for corresponding Taiwan Application No. 090123707.
Taiwan Utility Model Publication No. 237163 with English and Japanese translation thereol, published Dec. 21, 1994. Korean Office Action with English and Japanese translation thereol for corresponding Korean Application No. 10-2001-0060475.
Korean Patent Publication No. 1999-0047069 with English and Japanese translation ol claims and abstract thereol, published Jul. 5, 1992.
Japanese Patent Laid-Open Publication No. Hei 11-231279 with corresponding U.S. Pat. 6,229,530. Korean Pat. Publication No. 1999-0056665, published Jul. 15, 1999, with Japanese and English translation ol claims and abstract thereol.
Japanese Patent Laid-Open Publication No. Hei 10-164840 with corresponding U.S. Pat. No. 5,910,891. Japanese Patent Laid-Open Publication No. Hei 11-202842 with English translation thereol.
* cited by examiner
Primary Examiner—Bipin Shalwala
Assistant Examiner—Mansour M. Said
(74) Attorney, Agent, or Firm—Hogan & Hartson, LLP
The supply voltage to a driving circuit (100) and LCD (200) generated by a power supply circuit (350) is controlled to be periodically turned on and off during a power save mode, using a timer circuit (260) or timer such as a counting circuit. In this manner, during the power save mode, the power consumption can be reduced by turning off the power supply, and, at the same time, the display can be periodically shown without any lurther manipulation. By suspending the output ol the gate selection signals to the display panels before the control to turn off the power supply, the display immediately before the turn off operation can be maintained even alter the power supply is turned off.
6 Claims, 8 Drawing Sheets