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:
Oct. 06, 2009
Filed:
Feb. 01, 2008
Hung-chun Chen, Hsinchu, TW;
Ko-yu Chiang, Hsinchu, TW;
Chen-pang Kung, Taoyuan County, TW;
Ming-daw Chen, Hsinchu, TW;
Hung-Chun Chen, Hsinchu, TW;
Ko-Yu Chiang, Hsinchu, TW;
Chen-Pang Kung, Taoyuan County, TW;
Ming-Daw Chen, Hsinchu, TW;
Industrial Technology Research Institute, Hsinchu, TW;
Abstract
A level shifter for a gate driver has a driving transistor, a reset transistor, a charge/discharge circuit, a threshold voltage detector, and a memory capacitor. An initial threshold voltage of the driving transistor is detected by the threshold voltage detector, and then memorized in the memory capacitor. The charge/discharge circuit charges or discharges the capacitor, and receives a control signal to actuate the level shifter. The reset transistor receives an output signal of a next stage level shifter as a reset signal, so as to restore the initial status of the level shifter. In this way, the driving current output from the level shifter is irrelevant to the threshold voltage of the driving transistor.