The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 18, 2008
Filed:
Apr. 11, 2003
Hiroyuki Takahashi, Funabashi, JP;
Shinya Hashimoto, Mobara, JP;
Takahiro Yamada, Mobara, JP;
Hitachi Displays, Ltd., Chiba-Ken, JP;
Hitachi Device Engineering Co., Ltd., Chiba-Ken, JP;
Abstract
A liquid crystal display device with both functions of transmission-mode display and reflection-mode display is capable of providing an improved display quality in each display mode, to thereby obtain on-screen display images of high quality in either one of the display modes. The liquid crystal display device includes a scan signal line drive circuit operable to apply a scan signal to a number of scan signal lines, an image/video signal line drive circuit which applies an image signal to a number of image signal lines, and a power supply circuit for supplying necessary voltages to the scan signal line drive circuit and image signal line drive circuit. The power supply circuit includes a counter electrode voltage generation circuit for selecting a voltage optimized for a respective display mode of the transmission mode and the reflection mode to thereby apply the selected voltage to a counter electrode.