Patent ID: 7893908

Claim:
A liquid crystal display device, comprising: a liquid crystal panel including a plurality of liquid crystal cells; a common voltage generation circuit that supplies a common voltage to said liquid crystal panel; a liquid crystal drive circuit that implements control for supplying said plurality of liquid crystal cells with voltage that accords with a video signal to display an image on said liquid crystal panel, and for reversing a polarity of the voltage supplied to said plurality of liquid crystal cells; and an adjustment module that stores characteristics data for correcting fluctuations in brightness and, based on said characteristics data, adjusts the brightness of said image displayed on said liquid crystal panel, wherein said common voltage generation circuit supplies a fixed common voltage to common electrodes to which said plurality of liquid crystal cells are connected in common, wherein said liquid crystal drive circuit reverses a polarity of the voltage supplied to said plurality of liquid crystal cells at a prescribed period, wherein said adjustment module comprises a memory module for storing said characteristics data for correcting fluctuations in brightness that originate from the polarity and amplitude of voltage supplied to said liquid crystal cells, wherein said adjustment module adjusts the brightness of display images that are based on image data of positive polarity for which the polarity of said voltage is taken as positive and the brightness of display images that are based on image data of negative polarity for which the polarity of said voltage is taken as negative, wherein the liquid crystal display device further comprises a control signal generation module that generates a timing signal that is an integer multiple of a vertical synchronizing signal that indicates a frame period of said video signal that is received as input, wherein said memory module comprises: a first look-up table in which are stored characteristics data for adjusting the brightness of display images that are based on said image data of positive polarity; and a second look-up table in which are stored characteristics data for adjusting the brightness of display images that are based on said image data of negative polarity, wherein said adjustment module further comprises: a switch circuit that receives said video signal as input, and that, based on the timing signal generated by said control signal generation module, selectively supplies the input video signal to one of said first and said second look-up tables, and wherein image data that have been adjusted by said first and second look-up tables are supplied to said liquid crystal drive circuit.