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US006909413B2
(12) United States Patent ao) Patent No.: us 6,909,413 B2
Nanno et al. (45) Date of Patent: Jun. 21,2005
(54) DISPLAY DEVICE
(75) Inventors: Yutaka Nanno, Takarazuka (JP); Kouji Senda, Nagaokakyo (JP); Shin-itsu Takehashi, Daito (JP)
(73) Assignee: Matsushita Electric Industrial Co., Ltd. (JP)
( * ) Notice: Subject to any disclaimer, the term ol this patent is extended or adjusted under 35 U.S.C. 154(b) by 344 days.
(21) Appl. No.: 10/168,307
(22) PCT Filed: Oct. 29, 2001
(86) PCT No.: PCT/JP01/09489
§ 371 (c)(1),
(2), (4) Date: Jun. 20, 2002
(87) PCT Pub. No.: WO02/35507 PCT Pub. Date: May 2, 2002
(65) Prior Publication Data
US 2002/0196208 Al Dec. 26, 2002
(30) Foreign Application Priority Data
Oct. 27, 2000 (JP) 2000-328716
Dec. 19, 2000 (JP) 2000-384840
(51) Int. C I. G09G 3/36
(52) U.S. CI 345/87; 345/211
(58) Field of Search 345/87, 92, 211,
345/89, 94, 95, 98, 99, 100, 204, 210; 315/169.1;
349/19, 33; 359/245; 327/536
(56) References Cited
U.S. PATENT DOCUMENTS
5,861,861 A * 1/1999 Nolan et al 345/87
The present invention provides a liquid crystal display device having a liquid crystal display portion, a gate driver circuit, a source driver circuit, and a power supply circuit, where the liquid crystal display portion includes unit pixels with pixel switching elements and pixel electrodes arranged in a matrix. The pixel switching elements are thin film transistors that are made ol polycrystalline silicon semiconductor formed on an insulating substrate. The power supply circuit is a charge pump-type power supply circuit, is made ol a polycrystalline silicon semiconductor, and is a built-in circuit integrally formed on an insulating substrate. With such a configuration, a liquid crystal display device that greatly reduces power consumption is realized.
21 Claims, 21 Drawing Sheets
