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:
Sep. 18, 2012
Filed:
Nov. 26, 2009
Ting-chung Liu, Taipei, TW;
Po-yang Chen, Tainan, TW;
Hsien-tang HU, Taipei, TW;
Chien-chih Hsiau, Taipei, TW;
Ting-Chung Liu, Taipei, TW;
Po-Yang Chen, Tainan, TW;
Hsien-Tang Hu, Taipei, TW;
Chien-Chih Hsiau, Taipei, TW;
Hannstar Display Corp., Taipei, TW;
Abstract
A photo element includes a photo thin film transistor (TFT), a switch thin film transistor, and a compensation thin film transistor. A bias line provides a bias voltage to the photo TFT. The photo TFT generates a photo-induced current under an illuminated environment. A first switch line provides a voltage to open the switch TFT, and thus the photo-induced current is read out through a readout line. A second switch line provides compensation current to open the compensation TFT. The compensation current applies a reverse-biased stress to the photo TFT; therefore the threshold voltage and sensitivity of the photo TFT can be maintained.