Patent ID: 6172661
Filing Date: 2001-01-09
Classification: G09G

Abstract:
A TFT liquid crystal display comprising:a TFT liquid crystal display panel includingan array of pixels including a thin-film transistor and a pixel electrode arranged in a matrix,a common electrode,a liquid crystal provided between the array of the pixel electrodes and the common electrode,a plurality of gate signal lines arranged in rows and connected with gate electrodes of the thin-film transistors in rows, anda plurality of drain signal lines arranged in columns and connected with drain electrodes of the thin-film transistors in columns;a gate drive circuit for driving the plurality of gate signal lines of the TFT liquid crystal display panel;a drain drive circuit for driving the plurality of drain signal lines of the TFT liquid crystal display panel;a common drive circuit for driving the common electrode;a grey-scale reference voltage generation circuit; anda display controller for controlling the circuits in response to control signals and display data from a computer unit;wherein the drain drive circuit generates intermediate voltages between a plurality of grey-scale reference voltages being generated from the grey-scale reference voltage generation circuit, and the intermediate voltages and the grey-scale reference voltages are applied to the drain signal lines to provide multiple grey-scale display;wherein the grey-scale reference voltage generation circuit generates a plurality of the grey-scale reference voltages such that the potential difference between the grey-scale reference voltages in a range of service voltage where an applied voltage-transmission factor characteristic of liquid crystal is non-linear is smaller than the potential difference between the grey-scale reference voltages in a range of service voltage where the applied voltage-transmission factor characteristic is relatively linear; andwherein the number of intermediate voltages generated by the drain drive circuit from the grey-scale reference voltages in the service voltage range where the applied voltage-transmission factor characteristic of liquid crystal is non-linear is smaller than the number of intermediate voltages generated from the grey-scale reference voltages in the service voltage range where the applied voltage-transmission factor characteristic of the liquid crystal is relatively linear.