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, 2014
Filed:
Apr. 15, 2010
Masayuki Hata, Osaka, JP;
Toshiaki Nakagawa, Osaka, JP;
Toshiyuki Yoshimizu, Osaka, JP;
Sharp Kabushiki Kaisha, Osaka, JP;
Abstract
The amount of the light emitted from a light-emitting diode is changed from that of the initial condition to increase, among the light sensors that are not shielded from the light emitted from the light-emitting diode, the number of the light sensors at which the difference (C−D) between the light detection amount at the light sensor when the light-emitting diode is ON and the light detection amount at the light sensor when the light-emitting diode is OFF is equal to the difference (A−B) between the light detection amount at the light sensor in the initial condition when the light-emitting diode was ON and the light detection amount at the light sensors in the initial condition when the light-emitting diode was OFF with no detection object present. As a result, regardless of the presence or absence of the detection object, the coordinate sensor and the display device disclosed can establish a threshold for determining the presence or absence of the detection object, and can also determine the coordinates of the detection object in a stable manner regardless of changes in the ambient environmental light or in the ambient environmental temperature, or fluctuations in the amount of light emitted from the light-emitting element disposed in the coordinate sensor or the change in the sensitivity of the light-receiving elements.