| 摘要 |
An organic light emitting display device is provided. The organic light emitting display device comprises: a display unit, a reference voltage generating unit, a tone voltage setting unit, a tone voltage outputting unit, and a data driving unit. The display unit includes a plurality of pixels arranged in a matrix. The reference voltage generating unit includes a first gamma code set based on an image displayed in the display unit in a first brightness level; and generates a reference voltage lookup table corresponding to each tone and brightness of the first brightness level based on the first gamma code. The tone voltage setting unit calculates R, G, B tone voltages corresponding to a second brightness level which is different from the first brightness level based on the reference voltage lookup table; and generates a gamma code corresponding to the second brightness level. The tone voltage outputting unit generates a plurality of tone voltages by using the gamma code corresponding to the second brightness level. The data driving unit generates a plurality of data voltages based on the tone voltages. The tone voltage setting unit generates the gamma code by making the R, G, B tone voltages which are analog values as integers; and determines a round-off process for the remaining tone voltages according to the round-off process of one tone voltage among the R, G, B tone voltages. The organic light emitting display device is provided to calculate a gamma reference voltage for temporary selection brightness; and generate an optimal tone voltage; thereby naturally performing a dimming mode. |
