LIQUID CRYSTAL DISPLAY DEVICE, LIQUID CRYSTAL DRIVER, REFERENCE PULSE GENERATING CIRCUIT, PULSE GENERATING METHOD AND ANALOG VOLTAGE OUTPUTTING METHOD

摘要

PROBLEM TO BE SOLVED: To suppress adverse effect on an analog output voltage caused by the switching corresponding to digital input data. SOLUTION: The liquid crystal display device is provided with a pulse generating circuit 21 which is a liquid crystal driver to supply voltage to be applied to liquid crystal cells forming an image display region and generates a plurality of reference pulses that are weighted for pulse generating density, pulse selecting/synthesizing circuits 23 which generate pulse trains by selecting/synthesizing necessary reference pulses based on digital input data of the reference pulses and integrating circuits (low pass filters) 25 which integrate the pulse trains generated by the circuits 23 and output analog voltages for gamma correction. The number of switchings per unit time of the pulse trains generated by the circuits 21 and 23 does not change in a prescribed range of gamma correction digital input data.