Display device and driving method thereof

Abstract

A display device includes a display unit including a plurality of scan lines, a plurality of data lines to which a plurality of compensation data signals are transmitted, a plurality of light emitting signal lines, and a plurality of pixels respectively connected to the plurality of scan lines, the plurality of data lines, and the plurality of light emitting signal lines, and a data driver generating a data voltage corresponding to a image data signal, and converting the data voltage to the compensation data signal. The data driver includes a compensator generating the compensation data signal in accordance with a feedback voltage. The feedback voltage is determined by a degree of deterioration associated with each pixel, and increases with an increasing deterioration degree of the pixel.

1 .- 15 . (canceled) 
     
     
         16 . A display device, comprising:
 a display unit including a plurality of scan lines to which a plurality of scan signals are transmitted, a plurality of data lines to which a plurality of compensation data signals are transmitted, a plurality of light emitting signal lines to which a plurality of light emitting signals are transmitted, and a plurality of pixels respectively connected to the plurality of scan lines, the plurality of data lines, and the plurality of light emitting signal lines; and   a data driver configured to generate a data voltage corresponding to an image data signal and to convert the data voltage into a compensation data signal,   wherein the data driver includes a compensator configured to receive a feedback voltage from each pixel according to a compensation control signal generated in accordance with the scan signal, the compensation control signal being supplied to the compensator and the plurality of pixels, the compensation data signal being determined in accordance with the feedback voltage.   
     
     
         17 . The display device as claimed in  claim 16 , wherein the compensation control signal is generated in synchronization with the scan signal. 
     
     
         18 . The display device as claimed in  claim 16 , wherein:
 the feedback voltage corresponds to the degree of deterioration of the pixel; and   the compensation control signal is generated from the scan signal with a predetermined phase delay.   
     
     
         19 . The display device as claimed in  claim 18 , wherein each of the plurality of pixels comprises:
 a switching transistor having a source terminal connected to the data line and a gate terminal connected to the scan line;   a driving transistor having a source terminal receiving a first power source voltage and a gate terminal connected to a drain terminal of the switching transistor;   a capacitor having a first end connected to the source terminal of the driving transistor and a second end connected between the gate terminal of the driving transistor;   a light emission control transistor having a gate terminal connected to the light emitting signal line and a source terminal connected to the drain terminal of the driving transistor;   an organic light emitting diode (OLED) having an anode connected to the drain terminal of the light emission control transistor and a cathode receiving a second power source voltage; and   a threshold voltage compensation transistor having a gate terminal receiving the compensation control signal, a drain terminal connected to the drain terminal of the driving transistor, and a source terminal connected to the source terminal of the switching transistor.   
     
     
         20 . The display device as claimed in  claim 19 , wherein the compensator comprises:
 a deterioration detector detecting a voltage at both ends of the organic light emitting diode as the feedback voltage according to the compensation control signal; and   a compensation data voltage generator calculating the variation amount of the feedback voltage and generating the compensation data signal by compensating the data voltage by the amount of the calculated feedback voltage.   
     
     
         21 . The display device as claimed in  claim 20 , wherein the compensator further comprises a switch transmitting the compensation data signal to the pixel according to a load signal that instructs transmission of the compensation data signal to the plurality of data lines. 
     
     
         22 . The display device as claimed in  claim 20 , wherein the deterioration detector comprises:
 an analog digital converter transmitting the feedback voltage to the compensation data voltage generator; and   a switch transmitting the feedback voltage to the analog digital converter according to the compensation control signal.   
     
     
         23 . A driving method of a display device including a plurality of scan lines to which a plurality of scan signals are transmitted, a plurality of data lines to which a plurality of compensation data signals are transmitted, a plurality of light emitting signal lines to which a plurality of light emitting signals are transmitted, and a plurality of pixels respectively connected to the plurality of scan lines, the plurality of data lines, and the plurality of light emitting signal lines, the driving method comprising:
 generating a data voltage corresponding to an image data signal; 
 outputting a feedback voltage from each of the plurality of pixels according to a compensation control signal generated in accordance with the scan signal; 
 detecting the feedback voltage from each of the plurality of pixels according to the compensation control signal; and 
 compensating the data voltage in accordance with the feedback voltage. 
 
     
     
         24 . The driving method as claimed in  claim 23 , wherein:
 the feedback voltage corresponds to the degree of deterioration of the pixel; and   the compensation control signal is generated from the scan signal with a predetermined phase delay.   
     
     
         25 . The driving method as claimed in  claim 24 , wherein detecting the feedback voltage comprises:
 applying the data voltage to each of the plurality of pixels;   transmitting a current corresponding to the data voltage to an organic light emitting diode according to the light emission control signal; and   generating a voltage at both ends of the organic light emitting diode with the feedback voltage.   
     
     
         26 . The driving method as claimed in  claim 24 , further comprising transmitting the compensation data signal to the pixel is in accordance with a load signal that instructs transmission of the compensation data signal to the plurality of data lines. 
     
     
         27 . The method as claimed in  claim 23 , wherein the compensation control signal is generated in synchronization with the scan signal.