Patent ID: 6377234
Filing Date: 2002-04-23
Classification: G09G

Abstract:
In a liquid crystal display circuit which enables a varying gradation display of a pixel in accordance with gradation data by using both a pulse width modulation technique in which a drive pulse width for each segment of a display is changed stepwise for successive pairs of successive frames of the display and a frame modulation technique in which a number of drive pulses output for each segment of the display is changed stepwise for successive pairs of successive frames of the display, a method of producing a varying gradation display comprising the steps of:generating a reset signal for resetting the driving pulses to vary the pulse width thereof in accordance with the gradation data; and selectively delaying the reset signal by a minimum fine adjustment width so that the pulse width of a drive signal of each pixel is increased by the minimum fine adjustment width and a total density of the successive pairs of successive frames have continuity and unevenness does not occur in gradation setting.