Patent ID: 7639218
Filing Date: 2009-12-29
Classification: G09G

Abstract:
1. An organic light emitting display (OLED) device comprising: a display panel having a plurality of pixels and adapted to display an image with luminance that varies with a brightness of ambient light; a scan driver adapted to output a scan signal to select the pixels; a data driver adapted to apply a data signal to the pixels selected by the scan signal; an emission control driver adapted to apply an emission control signal to control emission of the pixels to which the data signal is applied; a light sensor adapted to sense the ambient light and output a voltage corresponding to the sensed ambient light; and an automatic brightness controller adapted to receive the output voltage of the light sensor, adjust a gamma value to a luminance corresponding to the output voltage, and apply a gamma reference voltage to the data driver, wherein the automatic brightness controller is adapted to sense a change in the ambient light by synchronizing the output voltage of the light sensor with a vertical synchronization (Vsync) signal.