Apparatus and method for compensating image of display device

摘要

An apparatus and method for compensating an image of a display device are disclosed. The image compensation apparatus of a display device comprises a scatterometer configured to analyze luminance of a display image according to a test initialization voltage and a test data voltage applied to a plurality of pixels and to measure a deviation of a threshold voltage of a driving transistor of the plurality of pixels; a voltage controller configured to divide the display panel into a predetermined area according to a deviation of a threshold voltage of the driving transistor and to calculate different initialization voltages that initialize driving of pixels included in the area on a predetermined area basis; and an initialization voltage supplier configured to apply a corresponding initialization voltage calculated in the voltage controller to the plurality of pixels included in the predetermined area.

主权项

1. An image compensation apparatus of a display device comprising a display panel that displays an image according to a data signal, the image compensation apparatus comprising:
a scatterometer configured to analyze luminance of a display image according to a test initialization voltage and a test data voltage applied to a plurality of pixels included in the display panel and to measure a deviation of a threshold voltage of a driving transistor of the plurality of pixels; a voltage controller configured to divide the display panel into a predetermined area according to a deviation of a threshold voltage of the driving transistor and to calculate different initialization voltages that initialize driving of a plurality of pixels included in the area on a predetermined area basis; and an initialization voltage supplier configured to apply a corresponding initialization voltage calculated in the voltage controller to a plurality of pixels included in the predetermined area, wherein the initialization voltage is applied to a gate electrode of a driving transistor of each of the plurality of pixels before a data voltage is applied to each of the plurality of pixels, wherein the voltage controller is configured to calculate each of the different initialization voltages that initialize driving of the plurality of pixels in the area on the predetermined area basis as a voltage value for corresponding end points of a compensation period of a threshold voltage of a driving transistor of a plurality of pixels included in the predetermined area, wherein the initialization voltage supplier comprises a plurality of resistors coupled in series, and is configured to divide a predetermined reference voltage into different initialization voltage values calculated in the voltage controller, and to supply the different initialization voltage values through an initialization voltage wire connected to each of the plurality of pixels, and wherein each of the plurality of pixels comprises:
an organic light emitting diode (OLED) configured to emit light according to a driving current corresponding to a data signal;a driving transistor configured to transfer a driving current corresponding to the data signal to the OLED;a switching transistor configured to transfer a data voltage according to the data signal to a gate electrode of the driving transistor;a threshold voltage compensation transistor configured to diode-connect a gate electrode and a drain electrode of the driving transistor; andan initialization transistor configured to apply a corresponding initialization voltage calculated in the voltage controller to the gate electrode of the driving transistor.