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. 19, 2015
Filed:
Oct. 25, 2012
E Ink Holdings Inc., Hsinchu, TW;
Wei-Tsung Chen, Hsinchu, TW;
Ted-Hong Shinn, Hsinchu, TW;
Chuang-Chuang Tsai, Hsinchu, TW;
Wen-Chung Tang, Hsinchu, TW;
Chih-Hsiang Yang, Hsinchu, TW;
E Ink Holdings Inc., Hsinchu, TW;
Abstract
A light sensor including a photo transistor is provided. A gate of the photo transistor receives a gate driving signal. The photo transistor senses a light source based on the gate driving signal to generate a light current signal. The photo transistor includes a metal-oxide active layer. The gate driving signal has a first voltage level during a trap period and has a second voltage level during a read period. The first voltage level is higher than the second voltage level. The gate driving signal of the photo transistor introduces a mechanism to rapidly eliminate excess carriers. Accordingly, the photo transistor has a rapid response while maintaining good light responsibility. Furthermore, a method for driving the foregoing photo transistor is also provided.