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US007158117B2
(12) United States Patent ao) Patent No.: Us 7,158,117 B2
Sato et al. (45) Date of Patent: Jan. 2,2007
(58) Field of Classification Search 345/173,
345/175, 178, 179, 158; 382/106; 178/18.01, 178/18.03, 18.04, 19.01, 19.02 See application file for complete search history.
(56) References Cited
U.S. PATENT DOCUMENTS
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4,695,680 A * 9/1987 Kable 178/19.01
4,764,885 A * 8/1988 Greanias et al 345/179
4,903,012 A * 2/1990 Ohuchi 345/178
6,518,959 Bl* 2/2003 Ito et al 345/175
6,700,129 Bl* 3/2004 Usuda et al 250/559.29
6,710,770 Bl * 3/2004 Tomasi et al 345/168
6,717,073 Bl * 4/2004 Xu et al 178/18.04
6,753,847 Bl * 6/2004 Kurtenbach et al 345/156
6,862,019 Bl * 3/2005 Kobayashi et al 345/173
6,933,934 Bl * 8/2005 Amemiya 345/179
2004/0021645 Al * 2/2004 Kobayashi et al 345/173
* cited by examiner
Primary Examiner—Amr A. Awad
Assistant Examiner—Tom Sheng
(74) Attorney, Agent, or Firm—Fitzpatrick, Cella, Harper &
Scinto
