Samsung Display Co., Ltd.

Sebyung Chae

Hyungryul Kang

Cheolmin Kim

Jungyu Lee

An organic light-emitting display apparatus includes a plurality of pixels, each including: an organic light emitting diode (OLED); a driving transistor; and a first node therebetween; a sensor for sensing a first current from the driving transistor when a first reference voltage is applied to the first node and sensing a second current from the driving transistor when a second reference voltage is applied to the first node, when a first source data signal, corresponding to a first gray level, is transferred to a corresponding one of the pixels; a driving current determiner for generating characteristic information of the driving transistor based on the first and the second currents and determining a driving current of the driving transistor, corresponding to the first gray level, based on the characteristic information of the driving transistor and current-voltage information of the OLED, which is stored in the memory.

Organic light-emitting display apparatus and method of driving the same

A gamma voltage generator, method of generating gamma voltage, and an OLED display including the generator are disclosed. In one aspect, the generator includes a gamma reference voltage selector configured to receive a gamma reference voltage from a voltage generator and output selected first to third gamma voltages having values substantially equal to or less than the gamma reference voltage. The generator also includes a medium gamma voltage selector configured to receive the first to third gamma voltages from the gamma reference voltage selector and select and output a plurality of medium gamma voltages based at least in part on the first to third gamma voltages. The generator further includes a medium gamma voltage calculator configured to output a selection signal corresponding to the calculated low gamma voltage to the medium gamma voltage selector.

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Yongin, South Korea

Sebyung Chae