Organic light emitting display device

摘要

An organic light emitting display device includes a display unit having pixels located at crossing regions of scan, control, data and sensing lines. Scan, control line, and data drivers respectively supply scan, control, and data signals to the scan, control, and data lines. A switching unit selectively couples the data lines to output lines of the data driver, a reference voltage source, or a negative bias voltage source. A sensing unit senses degradation information of an organic light emitting diode in the pixels and threshold voltage of a driving transistor in the pixels through the sensing lines. A control block stores the sensed degradation information and threshold voltage information. A timing controller is configured to generate a second data by converting an externally inputted first data using the degradation information and the threshold voltage information, and supply the second data to the data driver.

主权项

1. An organic light emitting display device coupled between a first power source and a second power source, the organic light emitting display comprising:
a display unit having a plurality of pixels located at crossing regions of scan lines, control lines, data lines and sensing lines, each of the pixels comprising an organic light emitting diode and a driving transistor coupled between the first power source and the organic light emitting diode and having a gate electrode coupled to a first node; a scan driver configured to supply scan signals to the scan lines; a control line driver configured to supply control signals to the control lines; a data driver configured to supply data signals to the data lines; a switching unit configured to selectively electrically couple the data lines to output lines of the data driver, a reference voltage source, or a negative bias voltage source; a sensing unit configured to sense degradation information of the organic light emitting diode and threshold voltage information of the driving transistor through the sensing lines; a control block configured to store the degradation information of the organic light emitting diode and the threshold voltage information of the driving transistor, sensed by the sensing unit; and a timing controller configured to generate second data by converting externally supplied first data using the degradation information of the organic light emitting diode and the threshold voltage information of the driving transistor and to supply the second data to the data driver, wherein one frame period is divided into a display subframe period and a black subframe period, during the display subframe period, an image is displayed corresponding to a corresponding data signal of the data signals generated from the second data, and the degradation information of the organic light emitting diode of each of the pixels on a selected horizontal line is sensed, and during the black subframe period, the threshold voltage information of the driving transistor of each of the pixels on the selected horizontal line is sensed, and a negative bias voltage of the negative bias voltage source or a turn-off voltage of the driving transistor is supplied to the gate electrode of the driving transistor of each of the pixels on other horizontal lines, wherein each of the pixels further comprises:
a second transistor coupled between the first node and a corresponding data line of the data lines, the second transistor having a gate electrode coupled to a corresponding scan line of the scan lines;a storage capacitor coupled between the first node and the first power source; anda third transistor coupled between an anode electrode of the organic light emitting diode and a corresponding sensing line of the sensing lines, the third transistor having a gate electrode coupled to a corresponding control line of the control lines.