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CGS REDUCTION DRIVING

IP.com Disclosure Number: IPCOM000013812D
Original Publication Date: 2000-May-01
Included in the Prior Art Database: 2003-Jun-18

Publishing Venue

IBM

Abstract

Disclosed is a method to reduce the feed-thru voltage that causes image sticking problems. When the TFT is turned off the charge distribute to the parasitic capacitance Cgs shown in Fig.1 and result in the pixel voltage drift by ∆ Vp.(Fig.2)This voltage drift adds DC component to LC driving voltage and causes the image sticking problem. Larger storage capacitor decreases the feed-thru voltage, but lose the aperture ratio. Though the compensation pulse by next gate line is also effective to eliminate the feed-thru voltage, this compensation limits the gate drivers' driving voltage. Fig.1 Cgs : gate to source capacitance (Capacitance created by red rectangle)