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:
Dec. 13, 2011
Filed:
Oct. 24, 2008
Masahiro Tada, Tokyo, JP;
Takashi Nakamura, Saitama, JP;
Hirotaka Hayashi, Fukaya, JP;
Masayoshi Fuchi, Ageo, JP;
Takayuki Imai, Fukaya, JP;
Masahiro Tada, Tokyo, JP;
Takashi Nakamura, Saitama, JP;
Hirotaka Hayashi, Fukaya, JP;
Masayoshi Fuchi, Ageo, JP;
Takayuki Imai, Fukaya, JP;
Toshiba Matsushita Display Technology Co., Ltd., Tokyo, JP;
Abstract
Two unshielded photosensors to determine the outside-light illuminance and two shielded photosensors are placed alternating both in the longitudinal direction and in the lateral direction. Then, the difference between the output of the unshielded photosensors and the output of the shielded photosensors is obtained. Accordingly, even when the thermoelectric currents differ from each other due to a variation in characteristics between the elements and a difference in the thermal distribution between the elements, the sensor currents can be corrected, so that a photodetector circuit which stably determines the outside-light illuminance can be provided.