COLOR LIQUID CRYSTAL DISPLAY DEVICE

摘要

PURPOSE:To improve the quality of color picture by relatively adjusting the pedestal levels of three-color signals supplied to a color liquid crystal display panel to compensate the difference of voltage-transmittance characteristic due to chrominance signals. CONSTITUTION:The video signal from an input terminal 11 is separated into three-color signals and a synchronizing signal, and chrominance signals are applied to pedestal level adjusting circuit 13 to relatively adjust pedestal level. The levels of these level-adjusted color signals are inverted by a signal inverting circuit 14, and chrominance signals and inverted color signals are inputted to an AC video signal circuit 15. The field signal from a synchronous control circuit 19 is applied to the circuit 15, and chrominance signals and inverted color signals are alternately taken out in every field by the circuit 15 and are inputted to the RGB switching circuit 16. One-line components of each chrominance signal are applied from the circuit 16 to a source driving circuit 17 to correct the color difference due to voltage-transmittance characteristic.