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:
May. 03, 2011
Filed:
Sep. 25, 2007
Takashi Kunimori, Tottori, JP;
Yutaka Sano, Tottori, JP;
Masanori Yasumori, Tottori, JP;
Sony Corporation, Tokyo, JP;
Abstract
A liquid crystal display deviceaccording to an embodiment of the present invention includes a liquid crystal display panel, a photodetector unit LSthat is built into the liquid crystal display panel and has a TFT ambient light photosensor, an ambient light photosensor reader Refor reading a voltage due to photo-leakage from the TFT ambient light photosensor, and a control meansfor controlling the photodetector unit and the ambient light photosensor reader, and a backlight, etc., according to an output from the ambient light photosensor reader. The photodetector unit has a switching element SWcoupled between a source line coupled to the TFT ambient light photosensor's source electrode Sand a drain line coupled to the TFT ambient light photosensor's drain electrode D. The control meansmakes the source line and the drain line of the TFT ambient light photosensor be coupled to a common potential when changing a gate voltage of the TFT ambient light photosensor by keeping the switching element SWturned on. It is therefore possible to provide a liquid crystal display device that utilizes a thin film transistor as an ambient light photosensor and prevents degradation of an ambient light photosensor element due to a biased polarity voltage applied to the gate electrode.