Title: Buffer for liquid crystal display and offset voltage compensation method thereof
Application Number: 200410049335 Application Date: 2004.06.11
Publication Number: 1558393 Publication Date: 2004.12.29
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G09G3/36
Applicant(s) Name: AU Optronics Corp. Address:
Inventor(s) Name:
Attorney & Agent: wang zhisen huang xiaolin
Abstract:
     A buffer circuit for a liquid crystal display device that comprises a first transistor further comprising a gate connectable to an input signal, a first electrode coupled to a first power supply, and a second electrode connectable to a second power supply, a second transistor further comprising a gate coupled to the second electrode of the first transistor, a first electrode connectable to the first power supply, and a second electrode connectable to the second power supply, a first capacitor being connectable to the input signal storing a voltage of the input signal when connected to the input signal, and providing a first voltage to the gate of the first transistor when disconnected from the input signal, a second capacitor further comprising a terminal coupled to the second electrode of the first transistor and the gate of the second transistor providing a second voltage at the terminal when the first transistor is turned on, and a third capacitor coupled to the first electrode of the second transistor providing a third voltage when the second transistor is turned on, wherein the second voltage further comprises a first offset including a gate to source voltage of the first transistor, and the third voltage further comprises a second offset including a gate to source voltage of the second transistor.
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