Organic light emitting display and method of compensating for threshold voltage thereof

摘要

An organic light emitting display and a method of compensating for a threshold voltage thereof are disclosed. The organic light emitting display includes a display panel including a plurality of pixels, a gate driving circuit generating first and second threshold voltage sensing gate pulses, a data driving circuit which supplies a threshold voltage sensing data voltage to the pixels in response to the first threshold voltage sensing gate pulse and detects a source voltage of a driving thin film transistor (TFT) of each pixel as a sensing voltage in response to the second threshold voltage sensing gate pulse, and a timing controller which modulates input digital video data for the image display based on a change in the sensing voltage and generates digital compensation data.

主权项

1. An organic light emitting display comprising:
a display panel including a plurality of pixels; a gate driving circuit configured to generate a first threshold voltage sensing gate pulse and a second threshold voltage sensing gate pulse; a data driving circuit configured to supply a threshold voltage sensing data voltage to the pixels in response to the first threshold voltage sensing gate pulse, and detect a source voltage of a driving thin film transistor (TFT) of each pixel as a sensing voltage in response to the second threshold voltage sensing gate pulse; and a timing controller configured to modulate input digital video data for the image display based on a change in a threshold voltage of the driving TFT, and generate digital compensation data, wherein the display is configured to determine the threshold voltage of the driving TFT based on the sensing voltage, wherein a sensing period for sensing the threshold voltage of the driving TFT is divided into a first period and a second period following the first period, and wherein a gate voltage of the driving TFT of each pixel is held at one or more high levels in the first period of the sensing period, and is held at a reference level lower than the high level in the second period of the sensing period, and wherein the gate driving circuit is further configured to generate the first threshold voltage sensing gate pulse at the same or different on-levels in the first and second periods.