Display device and method for driving the same
地域：
Yongin-si
摘要
A display device including: a scan driver that transmits scan signals to scan lines; a data driver that data signals to data lines; and a display portion that includes pixels, respectively connected to the corresponding scan lines and corresponding data lines, and displays an image by the pixels that simultaneously emit light according to the corresponding data signals, wherein each of pixels includes: an organic light emitting diode; a first transistor that includes a gate connected to a first node, and is connected between first power and an anode of the organic light emitting diode; a second transistor that includes a gate connected to a corresponding scan line and transmits the corresponding data signal to the first node; and a first capacitor that is connected to the first node, and stores a data voltage according to the data signal.
說明書
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This application claims priority from and the benefit of Korean Patent Application No. 10-2018-0030287, filed on March 15, which is hereby incorporated by reference for all purposes as if fully set forth herein.
Exemplary implementations of the invention relate generally to a display device and, more specifically, to a driving method thereof.
A display device displays an image by using an organic light emitting diode (OLED) included in each pixel. Holes provided from an anode of the organic light emitting diode and electrons provided from a cathode of the organic light emitting diode combine in an emission layer such that the organic light emitting diode emits light.
Recently, responding to demand for a higher resolution display device, many more pixels have been disposed in a display area of the display device compared to a conventional display device. However, since it is difficult to very densely arrange pixels having a complex structure for compensation of a deviation in threshold voltage, pixels having a structure that can compensate for threshold voltage deviation while implementing a high resolution display device have been researched and developed.
In such pixels, the data voltage written into each of the pixels during a previous frame period may affect an image to be displayed during the next frame period, and accordingly, display quality of the display device may be deteriorated.
權(quán)利要求
What is claimed is:1. A display device comprising:a scan driver configured to transmit a plurality of scan signals to a plurality of scan lines; a data driver configured to transmit a plurality of data signals to a plurality of data lines; and a display portion having a plurality of pixels, each of which is respectively connected to one of the corresponding scan line and one of the corresponding data line, and is configured to display an image through the plurality of pixels that simultaneously emit light according to the corresponding data signals, wherein each of the plurality of pixels comprises: an organic light emitting diode; a first transistor having a gate connected to a first node, and being connected between a first power source and an anode of the organic light emitting diode; a second transistor having a gate connected to a corresponding scan line and being configured to transmit the corresponding data signal to the first node; and a first capacitor connected to the first node, and configured to store a data voltage based on the data signal, and wherein the first power source is configured to apply one of a first voltage level and a second voltage level that is higher than the first voltage level, and to be at the first voltage level entirely for an initialization period in which the gate of the first transistor is initialized based on the first voltage level of the first power source, wherein the scan driver is configured to simultaneously apply scan signals alternating between a gate-off voltage level and a gate-on voltage level lower than the gate-off voltage level to the plurality of scan lines at least two times during the initialization period. 2. The display device of claim 1 , further comprising a second capacitor having a first electrode connected to a corresponding data line and a second electrode connected with a first end of the second transistor at a second node. 3. The display device of claim 2 , wherein the first capacitor comprises a first electrode connected to an initialization power source and a second electrode connected to the first node. 4. The display device of claim 3 , wherein the first power source is configured to apply one of the first voltage level, the second voltage level that is higher than the first voltage level, and a third voltage level that is higher than the second voltage level, and the initialization power source is configured to apply one of a fourth voltage level, and a fifth voltage level that is higher than the fourth voltage level. 5. The display device of claim 4 , wherein the first power source applies the first voltage level for a period during which the plurality of data signals are transmitted to the plurality of data lines, and the first power source applies the third voltage level for a period during which the organic light emitting diode emits light. 6. The display device of claim 5 , wherein when on-level scan signals are simultaneously applied to the plurality of scan lines for the initialization period, the initialization power source applies the fifth voltage level, and when off-level scan signals are simultaneously applied to the plurality of scan lines, the initialization power source applies the fourth voltage level. 7. The display device of claim 6 , further comprising a third transistor having a gate connected to the initialization power source, and being connected between the anode and the second node. 8. The display device of claim 6 , wherein the display portion further comprises a common control line that is connected to the plurality of pixels,the scan driver is configured to transmit a common control signal to the common control line, and each of the plurality of pixels comprises a third transistor having a gate connected to the common control line and being connected between the anode and the second node. 9. The display device of claim 8 , wherein the scan driver is configured to apply an on-level common control signal of to the common control line during the initialization period. 10. The display device of claim 1 , further comprising a light emission control driver configured to transmit a plurality of light emission control signals to a plurality of light emission control lines,wherein each of the plurality of pixels is connected to a corresponding one of the light emission control lines, and the light emission control driver is configured to simultaneously apply on-level light emission control signals to the plurality of light emission control signal lines. 11. The display device of claim 10 , further comprising:a third transistor having a gate connected to the corresponding scan line, a first end connected to the first power source, and a second end connected to the first end of the first transistor at a second node; and a fourth transistor having a gate connected to the corresponding light emission control line, a first end connected to the first power source, and a second end connected to the second node, wherein the second transistor has a first end connected to the first node and a second end connected to the anode, the first capacitor has a first electrode connected to the first power and a second electrode connected to the first node, and wherein the organic light emitting diode further comprises a cathode connected to a second power source. 12. The display device of claim 11 , wherein the first power source is configured to apply one of a first voltage level and a second voltage level that is higher than the first voltage level, andthe second power source is configured to apply one of a third voltage level, a fourth voltage level that is higher than the third voltage level, and a fifth voltage level that is higher than the fourth voltage level. 13. The display device of claim 12 , wherein the first power source is configured to apply the first voltage level and the second power source is configured to apply the second voltage level during the initialization period, andthe first power source is configured to apply the second voltage level and the second power source is configured to apply the third voltage level during a period in which the organic light emitting diode emits light. 14. The display device of claim 13 , wherein, for the initialization period, when the on-level scan signals are simultaneously applied to the plurality of scan lines, the light emission control driver simultaneously applies off-level light emission control signals to the plurality of light emission control signal lines, and when off-level scan signals are simultaneously applied to the plurality of scan lines, the light emission control driver is configured to simultaneously apply on-level light emission control signals to the plurality of light emission control signal lines. 15. A method of driving a display device having a plurality of pixels and a scan driver to transmit a plurality of scan signals to a plurality of scan lines that are respectively connected to the plurality of pixels, wherein each of the plurality of pixels includes an organic light emitting diode, a first transistor having a gate connected to a first node and being connected between a first power source and an anode of the organic light emitting diode, a second transistor having a gate connected to a corresponding scan line and being configured to transmit a data signal to a first node, and a first capacitor to store a data voltage based on to the data signal, the driving method comprising the steps of:initializing the gate of the first transistor; compensating a threshold voltage of the first transistor; transmitting a data voltage based on the data signal to the first node; and generating a driving signal to cause light to be emitted from the organic light emitting diode, wherein the first power source is configured to apply one of a first voltage level and a second voltage level that is higher than the first voltage level, and to be at the first voltage level entirely for an initialization period in which the gate of the first transistor is initialized based on the first voltage level of the first power source, wherein in the step of initializing the gate of the first transistor, the scan driver simultaneously applies scan signals alternating between a gate-off voltage level and a gate-on voltage level lower than the gate-off voltage level to the plurality of scan lines at least two times during the initialization period. 16. The driving method of claim 15 , wherein each of the plurality of pixels further comprises a second capacitor having a first electrode connected to a data line to which the data signal is applied and a second electrode connected to a first end of the second transistor and a second node,the first capacitor having a first electrode connected to an initialization power source and a second electrode connected to the first node, the first power source being configured to apply the first voltage level, the second voltage level that is higher than the first voltage level, and a third voltage level that is higher than the second voltage level, and the initialization power source being configured to apply one of a fourth voltage level, and a fifth voltage level that is higher than the fourth voltage level. 17. The driving method of claim 16 , wherein the step of initializing the gate of the first transistor further comprises a step during whichthe initialization power source applies the fifth voltage level when the on-level scan signals are simultaneously applied to the plurality of scan lines, and the initialization power source applies the fourth voltage level when off-level scan signals are simultaneously applied to the plurality of scan lines. 18. The driving method of claim 17 , whereinthe step of generating a driving signal to cause light to be emitted from the organic light emitting diode further comprises a step in which the first power source applies the third voltage level. 19. The driving method of the display device of claim 15 , wherein the display device further comprises a light emission control driver that transmits a plurality of light emission control signals to a plurality of light emission control lines, each of the plurality of pixels is connected to a corresponding light emission control line, andthe light emission control driver simultaneously applies on-level light emission control signals to the plurality of light emission control signal lines. 20. The driving method of claim 19 , wherein the step of initializing the gate of the first transistor further comprises the steps of:when on-level scan signals are simultaneously applied to the plurality of scan lines, the light emission control driver simultaneously applies off-level light emission control signals to the plurality of light emission control signal lines; and when off-level scan signals of the are simultaneously applied to the plurality of scan lines, the light emission control driver simultaneously applies on-level light emission control signals to the plurality of light emission control signal lines. 21. A display device comprising:a scan driver configured to transmit a plurality of scan signals to a plurality of scan lines and transmit a common control signal to a common control line; a data driver configured to transmit a plurality of data signals to a plurality of data lines; and a display portion having a plurality of pixels, each of which is respectively connected to one of the corresponding scan line, one of the corresponding data line, and the common control line, and is configured to display an image through the plurality of pixels that simultaneously emit light according to the corresponding data signals, wherein each of the plurality of pixels comprises: an organic light emitting diode; a first transistor having a gate connected to a first node, and being connected between a first power source and an anode of the organic light emitting diode; a second transistor having a gate connected to a corresponding scan line, being connected between the first node and a second node, and being configured to transmit the corresponding data signal to the first node; a third transistor having a gate connected to the common control line and being connected between the anode and the second node; and a first capacitor connected between the first node and an initialization power source, and configured to store a data voltage based on the data signal, and wherein the scan driver is configured to simultaneously apply on-level scan signals to the plurality of scan lines at least two times during a period in which the gate of the first transistor is initialized. 22. A display device comprising:a scan driver configured to transmit a plurality of scan signals to a plurality of scan lines; a data driver configured to transmit a plurality of data signals to a plurality of data lines; and a display portion having a plurality of pixels, each of which is respectively connected to one of the corresponding scan line and one of the corresponding data line, and is configured to display an image through the plurality of pixels that simultaneously emit light according to the corresponding data signals, wherein each of the plurality of pixels comprises: an organic light emitting diode; a first transistor having a gate connected to a first node, and being connected between a first power source and an anode of the organic light emitting diode; a second transistor having a gate connected to a corresponding scan line, being connected between the first node and a second node, and being configured to transmit the corresponding data signal to the first node; a third transistor having a gate connected to an initialization power source and being connected between the anode and the second node; and a first capacitor connected between the first node and an initialization power source, and configured to store a data voltage based on the data signal, and wherein the scan driver is configured to simultaneously apply on-level scan signals to the plurality of scan lines at least two times during a period in which the gate of the first transistor is initialized. 23. The display device of claim 21 , further comprising a second capacitor having a first electrode connected to a corresponding data line and a second electrode connected with a first end of the second transistor at a second node. 24. The display device of claim 22 , further comprising a second capacitor having a first electrode connected to a corresponding data line and a second electrode connected with a first end of the second transistor at a second node.
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