Pixel, Display Device Including The Pixel, And Driving Method Of The Display Device

Abstract

A display device that includes a pixel including an organic light emitting diode (OLED), a driving transistor connected to the driving voltage and supplying a driving current to the OLED, a compensation capacitor connected to the gate electrode of the driving transistor, and a first storage capacitor and a second storage capacitor electrically connected to or blocked from the compensation capacitor, and a driving method thereof.

1 . A driving method of a display device including a plurality of pixels, each including an organic light emitting diode (OLED), a driving transistor connected to a driving voltage and supplying a driving current to the OLED, a compensation capacitor connected to a gate electrode of the driving transistor, a first storage capacitor electrically connected to or disconnected from the compensation capacitor, and a second storage capacitor, the method comprising:
 a reset step in which an anode voltage of the OLED is discharged;   a compensation step in which a threshold voltage of the driving transistor is stored to the compensation capacitor;   a scan step in which a data voltage is stored to the first storage capacitor according to a corresponding data signal; and   a light emitting step in which the OLED emits light according to the driving current flowing to the driving transistor by a data voltage stored to the second storage capacitor,   wherein the light emitting steps of the plurality of pixels are concurrently generated, and the scan step and the light emitting step are temporally overlapped.   
     
     
         2 . The driving method of  claim 1 , wherein
 the scan step includes   a step in which the connection of the first storage capacitor and the compensation capacitor is blocked, and the first storage capacitor is transmitted with the corresponding data signal.   
     
     
         3 . The driving method of  claim 1 , wherein
 the light emitting step includes   a step in which the second storage capacitor and the compensation capacitor are connected, and the voltage of the gate electrode of the driving transistor is changed by the data voltage stored in the second storage capacitor.   
     
     
         4 . The driving method of  claim 1 , wherein
 the reset step includes   a step in which the driving transistor is turned on such that an anode of the OLED is connected to the driving voltage, and a different driving voltage input to a cathode of the OLED is higher than the driving voltage.   
     
     
         5 . The driving method of  claim 1 , wherein
 the compensation step includes   a step in which the first storage capacitor is connected to the compensation capacitor, a set voltage is input to a node to which the first storage capacitor and the compensation capacitor are connected, and the driving transistor is diode-connected.   
     
     
         6 . The driving method of  claim 1 , wherein
 the reset step includes   a step in which the first storage capacitor and the compensation capacitor are connected, a set reference voltage is transmitted to a node at which the first storage capacitor and the compensation capacitor are connected, and the voltage of the gate electrode of the driving transistor is initialized by the reference voltage.   
     
     
         7 . The driving method of  claim 6 , wherein
 the reference voltage is a level for turning on the driving transistor.   
     
     
         8 . The driving method of  claim 7 , wherein
 the display device further includes another driving voltage connected to a cathode of the OLED, and   a voltage level of the other driving voltage during the reset step and the compensation step is different than that during the light emitting step.   
     
     
         9 . A driving method of a display device including a plurality of pixels, each including a driving transistor, a first storage capacitor, and a second storage capacitor, the method comprising:
 programming first frame data to the first storage capacitor of each of the plurality of pixels during a first scan period;   programming second frame data to the second storage capacitor of each of the plurality of pixels during a second scan period; and   emitting light through the plurality of pixels by a driving current flowing in the driving transistor of each of the plurality of pixels according to the first frame data programmed to the first storage capacitor during a first light emitting period,   wherein the second scan period and the first light emitting period are temporally overlapped.   
     
     
         10 . The driving method of  claim 9 , further comprising
 programming third frame data preceding the first frame data to the second storage capacitor of each of the plurality of pixels; and   emitting light through the plurality of pixels by a driving current flowing in the driving transistor of each of the plurality of pixels according to the third frame data programmed to the second storage capacitor of each of the plurality of pixels during a second light emitting period, and   the second light emitting period and the first scan period are temporally overlapped.   
     
     
         11 . The driving method of  claim 9 , wherein
 the first frame data is first view point data, and the second frame data is second view point data different from the first view point data.   
     
     
         12 . A pixel comprising:
 an organic light emitting diode (OLED);   a driving transistor configured to be electrically connected to a first driving voltage and to supply a driving current to the OLED;   a compensation capacitor including one electrode connected to a gate electrode of the driving transistor;   a first operation control transistor including one electrode connected to another electrode of the compensation capacitor and configured to be controlled by a first operation control signal;   a second operation control transistor including one electrode connected to the other electrode of the compensation capacitor and configured to be controlled by a second operation control signal;   a first storage capacitor including one electrode connected to another electrode of the first operation control transistor; and   a second storage capacitor including one electrode connected to another electrode of the second operation control transistor,   wherein the second operation control transistor is configured such that when it is turned on, the second storage capacitor and the compensation capacitor are connected during a period in which the first operation control transistor is turned off such that a data voltage is stored to the first storage capacitor according to a corresponding data signal.   
     
     
         13 . The pixel of  claim 12 , further comprising:
 a first switching transistor including one electrode connected to the one electrode of the first storage capacitor, and another electrode configured to be input with the corresponding data signal and to be controlled by a first scan signal; and   a second switching transistor including one electrode connected to the one electrode of the second storage capacitor, and another electrode configured to be input with the corresponding data signal and to be controlled by a second scan signal.   
     
     
         14 . The pixel of  claim 13 , further comprising
 a compensation transistor connected between the gate electrode and a drain electrode of the driving transistor.   
     
     
         15 . The pixel of  claim 14 , wherein
 the first switching transistor is configured to be turned on and the compensation transistor is configured to be turned on during a compensation period.   
     
     
         16 . The pixel of  claim 12 , wherein:
 the first storage capacitor includes another electrode configured to be connected to the first driving voltage; and   the second storage capacitor includes another electrode configured to be connected to the first driving voltage.   
     
     
         17 . The pixel of  claim 12 , wherein:
 the first storage capacitor includes another electrode configured to be connected to a set reference voltage different from the first driving voltage; and   the second storage capacitor includes another electrode configured to be connected to the reference voltage.   
     
     
         18 . The pixel of  claim 12 , wherein:
 the first driving voltage includes a second driving voltage and a third driving voltage;   the second driving voltage and the third driving voltage have the same waveform; and   the pixel further includes   a first light emitting transistor connected between a source of the second driving voltage and the driving transistor, and   a second light emitting transistor connected between a source of the third driving voltage and the driving transistor.   
     
     
         19 . The pixel of  claim 12 , wherein
 the pixel further includes   a source of a fourth driving voltage applied to a cathode of the organic light emitting diode (OLED), and   the driving transistor is turned on during a reset period and the first driving voltage has a lower level than the fourth driving voltage.   
     
     
         20 . A display device comprising:
 a plurality of data lines for transmitting a plurality of data signals;   a plurality of first scan lines for transmitting a plurality of first scan signals;   a plurality of second scan lines for transmitting a plurality of second scan signals;   a first operation control line and a second operation control line for transmitting a first operation control signal and a second operation control signal;   a first voltage line for transmitting a first driving voltage and a second voltage line for transmitting a second driving voltage; and   a plurality of pixels each connected to a corresponding data line of the data lines, a corresponding first scan line of the first scan lines, a corresponding second scan line of the second scan lines, the first operation control line, the second operation control line, the first voltage line, and the second voltage line,   wherein each of the pixels includes   an organic light emitting diode (OLED) including a cathode connected to the second voltage line,   a driving transistor connected to the first voltage line for supplying a driving current to the OLED,   a compensation capacitor connected to a gate electrode of the driving transistor,   a first storage capacitor and a second storage capacitor connected between the compensation capacitor and a source of the driving voltage, and   wherein the display device is configured to provide:   a first period in which the first storage capacitor is connected to the corresponding data line according to both a first scan signal of the first scan signals transmitted through the corresponding first scan line and the first operation control signal transmitted through the first operation control line, and the compensation capacitor is blocked; and   a second period temporally overlapped with the first period and in which the second storage capacitor is blocked from the corresponding data line and is connected to the compensation capacitor according to both a second scan signal of the second scan signals transmitted through the corresponding second scan line and the second operation control signal transmitted through the second operation control line.   
     
     
         21 . The display device of  claim 20 , wherein
 the display device further includes a compensation control line for transmitting a compensation signal, and   each of the pixels further includes a compensation transistor connected between the gate electrode and a drain electrode of the driving transistor and operated according to the compensation signal.   
     
     
         22 . The display device of  claim 21 , wherein
 during a reset period in which the compensation transistor is turned on and the first driving voltage transmitted through the first voltage line is at a first level, the display device is configured to provide the second driving voltage with a voltage level transmitted through the second voltage line that is different from the level of the second driving voltage during the first period and the second period.   
     
     
         23 . The display device of  claim 22 , wherein
 the first driving voltage is at a second level different from the first level during the first period and the second period.