Display device and driving method thereof
View Patent ↗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. 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, the plurality of light emitting signal lines, and a first power source voltage; 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 generate an additive voltage by adding the first power source voltage to the data voltage, to receive a feedback voltage corresponding to a threshold voltage of a driving transistor of each pixel according to a compensation control signal generated in synchronization with the scan signal, the feedback voltage corresponding to a voltage difference between the first power source voltage and the threshold voltage of the driving transistor, and to generate a difference between the additive voltage and the feedback voltage as the compensation data signal.
2. The display device as claimed in claim 1 , wherein the compensator comprises:
an additive voltage generator configured to generate the additive voltage by adding the data voltage and the first power source voltage;
a compensation data voltage generator configured to generate the compensation data signal by subtracting feedback voltage from the additive voltage;
a first switch transmitting the feedback voltage to the compensation data voltage generator according to the compensation control signal; and
a second 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.
3. The display device as claimed in claim 2 , wherein the compensation data voltage generator comprises a non-inversion terminal receiving the additive voltage, an inversion terminal receiving the feedback voltage, and an output terminal connected to the data line.
4. The display device as claimed in claim 2 , wherein each of the plurality of pixels comprises:
a switching transistor having a source terminal connected to the data line and a gate line connected to the scan line;
a driving transistor having a source terminal receiving the 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 to 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 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.
5. 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, the plurality of light emitting signal lines, and a first power source voltage, the driving method comprising:
generating a data voltage corresponding to an image data signal;
generating an additive voltage by adding the first power source voltage to the data voltage;
receiving a feedback voltage corresponding to a threshold voltage of a driving transistor of each of the plurality of pixels according to a compensation control signal generated by synchronization with the scan signal, the feedback voltage corresponding to a voltage difference between the first power source voltage and the threshold voltage of the driving transistor; and
generating a difference between the additive voltage and the feedback voltage and transmitting the difference as a compensation data signal to the plurality of data lines.
6. The driving method as claimed in claim 5 , wherein the feedback voltage equals a difference between the power source voltage and the threshold voltage of the driving transistor.
7. The driving method as claimed in claim 5 , wherein 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.