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. 10, 2015
Filed:
Jun. 10, 2011
Chuan-i Huang, Hsinchu, TW;
Chin-wen Lin, Hsinchu, TW;
Hsing-yi Wu, Hsinchu, TW;
Ted-hong Shinn, Hsinchu, TW;
Chuan-I Huang, Hsinchu, TW;
Chin-Wen Lin, Hsinchu, TW;
Hsing-Yi Wu, Hsinchu, TW;
Ted-Hong Shinn, Hsinchu, TW;
E Ink Holdings Inc., Hsinchu, TW;
Abstract
A compensation method for a light emitting diode (LED) circuit including a first transistor, a second transistor, a capacitor, and a LED is illustrated. A first end as a control end of the first transistor is connected to one end of the second transistor and the capacitor, and a second end of the first transistor is connected to the LED. A width to length (W/L) ratio of the second transistor is less than one. An initial control voltage is applied to a control end of the second transistor, and the current output voltage of the LED is correspondingly measured. If a difference between the current output voltage and an initial output voltage exceeds a predetermined value, a compensation voltage, which is a summation of the initial control voltage and the difference, is applied to the control end of the second transistor.