Samsung Display Co., Ltd.

Cheolmin Kim

Hyungryul Kang

Sebyung Chae

Jungyu Lee

Sun-koo Kang

Kyung-woo Kim

A display device includes a display panel including pixels connected to emission lines, a controller configured to receive a control signal, and to generate an emission start signal, a first emission clock signal and a second emission clock signal, and an emission driver configured to provide emission signals to the pixels through the emission lines in response to the emission start signal, the first emission clock signal and the second emission clock signal. The controller is further configured to determine an off period ratio for the pixels in units of two or more frame periods in response to the dimming signal. The control signal may be a dimming signal, a low power mode signal, or another type of signal indicative of operation of the display device.

Display device including an emission driver for controlling an off period ratio based on dimming signal

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.

Gamma voltage generator, method of generating gamma voltage, and organic light-emitting diode display including the generator

A display apparatus includes pixels connected to scan lines, data lines, and emission control lines. Each include includes an organic light-emitting diode (OLED), a first transistor to transfer driving current to the OLED based on a data signal, a second transistor to transfer the data signal to the first transistor based on a first scan signal having a gate-on voltage level during a data writing period, a first capacitor connected between a gate electrode of the first transistor and a first power source, and a second capacitor connected between a drain electrode of the first transistor and the first power source.

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Yongin, South Korea

Cheolmin Kim