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New Driving Method for Liquid Crystal Display

IP.com Disclosure Number: IPCOM000057387D
Original Publication Date: 1988-May-01
Included in the Prior Art Database: 2005-Feb-15

Publishing Venue

IBM

Related People

Authors:
Suzuki, H [+details]

Abstract

A new liquid crystal display (LCD) driving method is described which enables a LCD to be flickerless. The LCD requires an AC drive to avoid liquid crystal material degradation due to DC current flow through it. This AC drive causes visible frequency flicker on the screen and degrades display quality. According to the new method, reciprocal phase driving upon adjacent two display elements (pixels) lowers this AC drive-related flicker. A LCD driving method commonly used today is as follows. At the odd frame, all pixels are driven with a positive signal phase. At the even frame, all pixels are driven with a negative signal phase. This AC driving signal becomes 1/2 frame frequency (Fig. 1). The commonly used frame frequency is about 60 Hz, so the AC driving frequency becomes about 30 Hz, and this is observed as flicker.