Organic light emitting display and degradation compensation method thereof

摘要

An organic light emitting display includes a display panel including pixels, a degradation sensing circuit which senses a threshold voltage of organic light emitting diodes included in the pixels and calculates an average degradation value defined by an average luminance value due to the degradation based on the sensed threshold voltage, a compensation target adjustor which adjusts a compensation target based on the average degradation value, each time the average degradation value is reduced by a previously determined reference value, and a data modulator which adds and subtracts a luminance compensation value determined depending on the adjusted compensation target to and from digital video data and modulates the digital video data.

主权项

1. An organic light emitting display comprising:
a display panel configured to display an image, the display panel including a plurality of pixels; a degradation sensing circuit configured to sense a threshold voltage of organic light emitting diodes included in the pixels and calculate an average degradation value defined by an average luminance value due to the degradation based on the sensed threshold voltage of the organic light emitting diodes; a compensation target adjustor configured to adjust a compensation target, which is a criterion of the luminance compensation, based on the average degradation value, each time the average degradation value is reduced by a previously determined reference value; and a data modulator configured to add and subtract a luminance compensation value determined depending on the adjusted compensation target to and from input digital video data and modulate the input digital video data, wherein each time the average degradation value is reduced by the previously determined reference value, the compensation target adjustor reduces stepwise the compensation target in conformity with changes in the average degradation value.