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:
Feb. 04, 2014
Filed:
Apr. 03, 2012
Hideo Sato, Hitachi, JP;
Shigeyuki Nishitani, Mobara, JP;
Takayuki Nakao, Atsugi, JP;
Naruhiko Kasai, Yokohama, JP;
Hajime Akimoto, Kokubunji, JP;
Hideo Sato, Hitachi, JP;
Shigeyuki Nishitani, Mobara, JP;
Takayuki Nakao, Atsugi, JP;
Naruhiko Kasai, Yokohama, JP;
Hajime Akimoto, Kokubunji, JP;
Japan Display Inc., Tokyo, JP;
Panasonic Liquid Crystal Display Co., Ltd., Hyogo-ken, JP;
Abstract
A display device with a touch pad function is provided which reduces the elements required to form a photo sensor while still accurately detecting input coordinate positions. The display device includes a display part on which a plurality of pixels are arranged in a matrix array, a plurality of photo detection circuits which are arranged in a matrix array in the inside of the display part, wherein each photo detection circuit of the plurality of photo detection circuits includes: a photo sensor which converts an incident light into a optical current corresponding to intensity of the incident light, an integral capacitance which integrates the optical current converted by the photo sensor, and a comparator to which a voltage of the integral capacitance is inputted, and the comparator includes a transistor of an open drain output type with a grounded source.