CN-116343665-B - Display device and driving method thereof

Abstract

A display apparatus includes a display panel including a plurality of pixels, the display panel configured to be driven in a first driving period, a blanking period after the first driving period, and a second driving period after the blanking period, a data driver configured to supply a data voltage to at least one pixel during the first driving period and the second driving period to display an image based on compensated image data, and detect a voltage from a reference voltage line connected to the at least one pixel to convert the voltage into sensing data, and a timing controller configured to determine first compensation data based on a difference between the sensing data detected during the first driving period and the sensing data detected during the second driving period, and determine the compensated image data based on input image data and the first compensation data.

Inventors

• JIN ZHENGXUN

Assignees

• 乐金显示有限公司

Dates

Publication Date

20260508

Application Date

20221222

Priority Date

20211223

Claims (19)

1. 1. A display device, comprising: A display panel including a plurality of pixels, the display panel configured to be driven in a first driving period, a blanking period after the first driving period, and a second driving period after the blanking period; A data driver configured to: Providing data voltages to at least one of the pixels to display an image based on the compensated image data, and Detecting a voltage from a reference voltage line connected to the at least one of the pixels during the first and second driving periods to convert the voltage into sensing data, and A timing controller configured to: Determining first compensation data based on a difference between the sensing data detected during the first driving period and the sensing data detected during the second driving period, and Determining the compensated image data based on input image data and the first compensation data, Wherein the at least one of the pixels includes a drive transistor, and Wherein the detected voltage from the reference voltage line corresponds to a voltage at an output terminal of the driving transistor.
2. 2. The display device according to claim 1, wherein: during the first drive period, the data driver is configured to apply a first image data voltage to the at least one of the pixels and detect a first voltage on the reference voltage line, During the blanking period, the data driver is configured to apply a sensing data voltage to the at least one of the pixels and detect a second voltage on the reference voltage line, and During the second driving period, the data driver is configured to apply a second image data voltage to the at least one of the pixels and detect a third voltage on the reference voltage line.
3. 3. The display device of claim 2, wherein the first image data voltage is equal to the second image data voltage.
4. 4. The display device of claim 1, wherein the data driver comprises: An analog-to-digital converter configured to convert the voltage to the sensed data; a digital-to-analog converter configured to convert the compensated image data into the data voltages, and A plurality of switches connected to the reference voltage line.
5. 5. The display device of claim 4, wherein the plurality of switches comprises: a first voltage switch configured to apply a driving reference voltage to the reference voltage line; A second voltage switch configured to apply a sensing reference voltage to the reference voltage line, and A sampling switch configured to connect the reference voltage line and the analog-to-digital converter.
6. 6. The display device according to claim 5, wherein during the first driving period: The second voltage switch is configured to be in an off state, and The analog-to-digital converter is configured to determine first sensed data after the first voltage switch is switched from an on state to an off state by sampling a first voltage on the reference voltage line with the sampling switch in the on state.
7. 7. The display device of claim 6, wherein during the blanking period: the first voltage switch is configured to be in the off state, and The analog-to-digital converter is configured to determine second sensed data after the second voltage switch is switched from an on state to the off state by sampling a second voltage on the reference voltage line with the sampling switch in the on state.
8. 8. The display device according to claim 7, wherein during the second driving period: the second voltage switch is configured to be in the off state, and The analog-to-digital converter is configured to determine third sensed data after the first voltage switch is switched from the on state to the off state by sampling a third voltage on the reference voltage line with a sampling switch in the on state.
9. 9. The display device of claim 8, wherein the timing controller is further configured to determine the first compensation data based on a difference between the first sensing data and the third sensing data, and determine the compensated image data based on the first compensation data.
10. 10. The display device of claim 9, wherein the timing controller is further configured to determine the second compensation data based on the second sensing data and determine the compensated image data based on the first compensation data and the second compensation data.
11. 11. The display device of claim 1, wherein the timing controller comprises: a data compensator configured to determine the first compensation data and to determine the compensated image data based on the first compensation data, and And a memory configured to store the sensing data and the first compensation data.
12. 12. The display device according to claim 11, Wherein the data compensator is configured to compare the sensed data detected during the first driving period with the sensed data detected during the second driving period to determine the first compensation data.
13. 13. The display device according to claim 11, wherein: during the blanking period, the data driver is configured to apply a sensing data voltage to the at least one of the pixels and detect second sensing data on the reference voltage line, and The data compensator is further configured to: Determining second compensation data reflecting a deviation in mobility of the driving transistor of the at least one of the pixels based on the second sensing data, and The compensated image data is determined based on the first compensation data and the second compensation data.
14. 14. The display device according to claim 1, wherein the timing controller further comprises a condition setter configured to set a driving condition of the at least one of the pixels.
15. 15. The display device according to claim 14, wherein the condition setter is configured to set the data driver to output the data voltage to the at least one of the pixels based on each of a plurality of driving frequencies and based on each of a plurality of grayscales.
16. 16. A method of driving a display device including a display panel including a plurality of pixels and a data driver configured to supply a data voltage to at least one of the pixels, the display panel configured to be driven in a first driving period and a second driving period in which an image is displayed and in a blanking period between the first driving period and the second driving period, the method comprising: Detecting a first voltage on a reference voltage line connected to the at least one of the pixels during the first driving period, and determining first sensing data based on the first voltage; detecting a second voltage on the reference voltage line during the blanking period, and determining second sensing data based on the second voltage; detecting a third voltage on the reference voltage line during the second driving period, and determining third sensing data based on the third voltage; determining compensated image data based on at least one of the first, second and third sensed data, and Applying the data voltage to the at least one of the pixels based on the compensated image data, Wherein said at least one of said pixels comprises a drive transistor, Wherein the detected voltage on the reference voltage line corresponds to the voltage at the output terminal of the drive transistor, and Wherein the determination of the compensated image data comprises: Determining first compensation data based on a difference between the first sensing data and the second sensing data and determining the compensated image data based on the first compensation data, or First compensation data is determined based on a difference between the first sensing data and the second sensing data, second compensation data is determined based on the second sensing data, and the compensated image data is determined based on the first compensation data and the second compensation data.
17. 17. The method of claim 16, wherein the second compensation data reflects a deviation in mobility of the drive transistor disposed in the at least one of the pixels.
18. 18. The method according to claim 16, wherein: The determining of the first sensed data includes sampling the first voltage to convert the first voltage to the first sensed data; the determining of the second sensed data includes sampling the second voltage to convert the second voltage to the second sensed data, and The determining of the third sensed data includes sampling the third voltage to convert the third voltage to the third sensed data.
19. 19. The method of claim 16, further comprising: The data driver is configured to apply the data voltage to the at least one of the pixels based on each of a plurality of driving frequencies and based on each of a plurality of grayscales.

Description

Display device and driving method thereof Cross Reference to Related Applications The present application claims priority from korean patent application No. 10-2021-0186013, filed on the korean intellectual property office at 12-23 of 2021, the disclosure of which is incorporated herein by reference. Technical Field The present disclosure relates to a display device and a driving method thereof, and more particularly, to a display device capable of compensating data and a driving method thereof. Background Among devices used as displays for computers, televisions, cellular phones, or other electronic equipment are organic light emitting display devices (OLEDs) that emit light by themselves and liquid crystal display devices (LCDs) that require a separate light source. Among various display devices, an OLED device includes a display panel having a plurality of sub-pixels and a driver driving the display panel. The driver includes a gate driver providing a gate signal and a data driver providing a data voltage to the display panel. When a signal such as a gate signal and a data voltage are supplied to the sub-pixels of the OLED device, the selected sub-pixels emit light to display an image. In recent years, a real-time compensation technique is applied to a blanking period to improve image quality. During the blanking period, the OLED element temporarily emits no light for sensing, so that a recovery voltage is applied after the blanking period to cause the OLED element to emit light. In this case, a potential deviation of the emission voltage of the OLED element occurs before and after the blanking period, thereby generating a luminance difference. Therefore, there is a problem in that bright lines or dark lines are recognized in an image screen, and thus image quality is deteriorated. Disclosure of Invention Accordingly, embodiments of the present disclosure are directed to a display device and a driving method thereof that substantially obviate one or more problems due to limitations and disadvantages of the related art. It is an object of the present disclosure to provide a display device capable of providing uniform image quality before and after real-time compensation. Another object of the present disclosure is to provide a display device that simultaneously compensates for both a characteristic value of a driving transistor and a data voltage offset. The features and aspects of the present disclosure are not limited to those mentioned above, some of which will be set forth in the description that follows, and other portions of these features and aspects will be apparent to those skilled in the art from the description that follows or may be learned by practice of the inventive concepts provided herein. To achieve these and other advantages and in accordance with the purpose of the present disclosure, as embodied and broadly described herein, a display device may include a display panel including a plurality of pixels, the display panel configured to be driven in a first driving period, a blanking period after the first driving period, and a second driving period after the blanking period, a data driver configured to provide a data voltage to at least one pixel during the first driving period and the second driving period to display an image based on compensated image data, and detect a voltage from a reference voltage line connected to the at least one pixel to convert the voltage into sensing data, and a timing controller configured to determine first compensation data based on a difference between the sensing data detected during the first driving period and the sensing data detected during the second driving period, and determine the compensated image data based on input image data and the first compensation data. According to another aspect of the present disclosure, a method of driving a display device including a display panel including a plurality of pixels and a data driver configured to supply a data voltage to at least one pixel, the display panel configured to be driven in a first driving period and a second driving period for displaying an image and in a blanking period between the first driving period and the second driving period, may include detecting a first voltage on a reference voltage line connected to the at least one pixel during the first driving period and determining first sensing data based on the first voltage, detecting a second voltage on the reference voltage line connected to the at least one pixel during the blanking period and determining second sensing data based on the second voltage, detecting a third voltage on the reference voltage line connected to the at least one pixel during the second driving period and determining third sensing data based on the third voltage, determining compensated image data based on at least one of the first, second and third sensing data, and applying the data voltage to the at least one pixel based on the compensated image data. Accord