Patent ID: 8558825

Claim:
An organic light emitting diode display, comprising: a display panel comprising a plurality of pixels arranged in a matrix at intersections of gate line portions and data line portions and each pixel having an organic light emitting diode, and a driving TFT that controls the amount of current flowing in the organic light emitting diode; a memory that stores compensation data; a timing controller that modulates input digital video data based on the compensation data and generates modulated data; and a data driving circuit that, during compensation driving, generates the compensation data to compensate for a difference of the deterioration between the organic light emitting diodes in the display panel by supplying a sensing voltage to the pixels and sampling the threshold voltage of the organic light emitting diodes, which is fed back from the pixels, and that, during normal driving, converts the modulated data into a data voltage and supplying the data voltage to the pixels, wherein the compensation driving is sequentially performed during a first period for charging a data line of the data line portions with the sensing voltage, a second period for floating the data line and then discharging the sensing voltage on the data line via the organic light emitting diode, and a third period for sampling a sensing voltage on a the data line remained after the discharging with the threshold voltage of the organic light emitting diode, where the normal driving is sequentially performed during a fourth period for sensing a difference of the deterioration between the driving TFTs in the display panel and a fifth period for light emission of the organic light emitting diode, and wherein the data driving circuit includes: a sensing voltage supply unit that generates the sensing voltage to sense the deterioration of the organic light emitting diodes during the first period; a sampling unit that samples the threshold voltage value of the organic light emitting diode depending on the deterioration of the organic light emitting diode fed back from the pixels during the third period; an ADC that analog-digital converts the threshold voltage values sampled by the sampling unit to generate the compensation data, and supplying the compensation data to the memory; and a data voltage generator that converts the modulated data into the data voltage and supplies the data voltage to the pixels during the fourth and fifth periods.