Patent ID: 8976206
Filing Date: 2015-03-10
Classification: G09G

Abstract:
1. A display device comprising: a timing controller configured to derive data signals for a display panel from external signals; a date driver configured to derive data voltages from the data signals and apply the data voltages to data lines on the display panel; a gamma IC (integrated circuit) chip configured to apply gamma voltages to the data driver; a power supply IC chip configured to apply a most significant voltage to the data driver; a DAC (digital-to-analog converter) configured to receive the gamma voltages and the most significant voltage from the gamma IC chip and the power supply IC chip, respectively, and generate the data voltages corresponding to the data signals; and a power supply unit configured to convert the gamma voltages and the most significant voltage using the data signals and apply the converted gamma voltages and the converted most significant voltage to the DAC; wherein the power supply unit includes an extraction portion configured to extract a maximum gray level, a minimum gray level, and unused middle gray levels of the data signals; and wherein the powers supply unit further includes a voltage converter configured to convert the calculated gamma voltages and the calculated most significant voltage, and wherein the voltage converter enables the gamma reference voltages corresponding to the unused middle gray levels to be adjusted to be at least one of gamma reference voltages corresponding to the maximum gray level and gamma reference voltages corresponding to the minimum gray level.