Patent ID: 7304655
Filing Date: 2007-12-04
Classification: G09G

Abstract:
1. An image display apparatus, comprising: a display panel having pixels arranged in a matrix and for performing a display operation; a scan driver for sequentially selecting pixel lines of the display panel; a data driver for applying color signals to a corresponding pixel line when the pixel line of the display panel is selected; and a display controller for receiving color data and generating timing signals for controlling the scan driver and the data driver, while transforming the color data into analog signals and performing gamma correction to the transformed analog signals to generate the color signals, wherein the display controller determines reference data for brightness adjustment in accordance with an average brightness of a screen displayed by the RGB data, and performs gamma correction by adjusting gray levels of the RGB data in accordance with the reference data for brightness adjustment, wherein the color signals are RGB signals, and the color data is RGB data, wherein the display controller comprises: a timing signal generating block for generating timing signals for controlling the scan driver and the data driver by using the received RGB data and transforming a data format of the RGB data; a data operating block for calculating average brightness of a screen displayed by the received RGB data and outputting address information corresponding to the calculated average brightness; a memory for storing reference data for brightness adjustment as data information corresponding to addresses, the reference data being matched with the calculated average brightness, and outputting reference data for brightness adjustment in response to the address information outputted from the data operating block; a D/A converting means for transforming the RGB data outputted from the timing signal generating block and the reference data for brightness adjustment into analog signals; an amplifying block for amplifying the analog signals of the reference data for brightness adjustment outputted from the D/A converting means; and a differential amplifying block for controlling white level of the RGB data by using analog signals of the RGB data and the reference data for brightness adjustment and generating RGB signals.