Patent ID: 9460661
Filing Date: 2016-10-04
CPC Classification: G09G

Claim Text:
1. An organic light emitting display comprising: a display panel including a plurality of pixels, each pixel using a source following manner, in which a source voltage of a driving thin film transistor (TFT) is changed according to a current flowing between a drain electrode and a source electrode of the driving TFT; a gate driving circuit configured to generate a mobility sensing gate pulse for operating the pixel in the source following manner; a data driving circuit configured to detect a sensing voltage corresponding to a mobility of the driving TFT from the pixel in response to the mobility sensing gate pulse; and a timing controller configured to set a mobility sensing period for detecting the sensing voltage in a period, in which a gate-source voltage of the driving TFT is greater than a threshold voltage of the driving TFT, wherein the mobility sensing period is included in a period in which the mobility sensing gate pulse is generated at an on-level, wherein the sensing voltage is detected in a predetermined period, which ranges from a start time point of the on-level of the mobility sensing gate pulse to a time point corresponding to a portion of one frame period, wherein the timing controller linearly corrects a slope indicating a ratio of a change amount of the sensing voltage to a change amount of the mobility and corrects the sensing voltage using a compensation function to increase the slope, wherein the compensation function calculates a gain value G based on a sensing voltage Vsen received from the data driving circuit, an average sensing voltage Vsen_ave, and a physical proportional constant K of the driving TFT, and wherein the timing controller multiplies digital video data by the gain value G, to be input to the pixel, and generates digital compensation data for compensating for a deviation between the mobilities of the driving TFTs.