P-23: Design Parameters for Using Charging Technique for TFT-LCDs

In case of charging a large capacitor in a short time, We use a well‐known pre charging technique(1), which is a method of charging a pixel two times at an interval of one gate pulse width. But there is a side effect of a pattern looking like out of focus. This phenomenon is caused directly by a different quantity of charging being introduced into two pixels which are two pixels apart vertically with each other. To remove this side efeect, we optimize the charging design parameter; Cst+Clc, Ion condition from TFT device. with the pre charging technique, A 120Hz 32″ WXGA TFT‐LCD which has three times of Cst + Clc as compared to conventional IPS structure has been developed.