Patent ID: 8884853

Claim:
An organic light emitting diode display device, a time period from a time a user turns on the organic light emitting diode display device to a time an image is displayed on a display panel being divided into a power signal turn on period, an initial driving period, and a frame period, the frame period being divided into an initializing period, a data charging period, and a light emitting period, comprising: the display panel having a plurality of pixel regions; a gate driving unit for driving gate lines and light emitting control lines of the display panel; a data driving unit for driving data lines of the display panel; a power supply unit for supplying first and second power signals to power lines of the display panel as well as a compensating voltage to a compensating power line; and a timing controller for controlling the gate and data driving units for displaying the image with a data voltage compensated with the compensating voltage, and supplying a level converting control signal to the power supply unit to convert a level of the compensating voltage, wherein the timing controller generates and supplies the level converting control signal to the power supply unit for maintaining the compensating voltage at a ground voltage level in the initial driving period when the power signal is supplied to, and generates and supplies the level converting control signal to the power supply unit such that the compensating voltage level is supplied after converted from the ground voltage level to a preset straight polarity compensating voltage level in the initializing period of the frame period of each pixel.