Samsung Display Co., Ltd.

Hansin Lim

Nam-Gon Choi

Yunki Baek

Seung-kyu Lee

A display device includes a display panel including a pixel, and a panel driver configured to receive a brightness value, and to generate a reference voltage and an initialization voltage. The pixel includes a driving transistor, a storage capacitor and a light emitting element. In an initialization period, the reference voltage is applied to a gate of the driving transistor, and the initialization voltage is applied to a source of the driving transistor. In a compensation period, the driving transistor is turned on based on the reference voltage such that a threshold voltage of the driving transistor is stored between first and second electrodes of the storage capacitor. The panel driver adjusts at least one of the reference voltage and the initialization voltage according to the brightness value.

Display device capable of adjusting at least one of reference voltage and initialization voltage according to brightness value

A gamma reference voltage generator includes a first resistor string, black voltage setters, a selector, and a second resistor string. The first resistor string receives a first reference voltage and a second reference voltage. The black voltage setters extract a plurality of black candidate voltages from the first resistor string. The selector selects one of the black candidate voltages as a black gamma voltage based on a selection signal. The second resistor string receives a first voltage corresponding to one of the black candidate voltages and a second voltage extracted from the first resistor string. In addition, the gamma reference voltage generator includes gamma voltage setters that extract a plurality of gamma voltages from the second resistor string.

Gamma reference voltage generator selecting one of black candidate voltages as black gamma voltage and display apparatus including the same

An organic light emitting display device includes a display panel, a gamma reference voltage generator, and a gamma voltage generator. The gamma reference voltage generator provides the data voltage having a predetermined voltage level to the display panel, changes brightness of the display panel by sequentially reducing the data voltage, determines a critical voltage by comparing a changing amount of the brightness to a predetermined reference changing amount of the brightness, and determines the gamma reference voltage based on the critical.

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Hwaseong-si, South Korea

Hansin Lim