CN-122029593-A - Method of operating pixel driving circuit and display device

Abstract

A method of operating a pixel driving circuit is provided. The method includes outputting driving currents to a plurality of light emitting elements, respectively, in a plurality of periods in one frame image. Each of the plurality of light emitting elements is driven by a driving current output in a corresponding one of the plurality of periods. Each cycle includes m periods. In each period of one frame image, the driving current is output to each light emitting element m times for m durations, respectively. In at least one frame of image, at least two durations among m durations in each period are different from each other.

Inventors

• YUAN CAN
• LI YONGQIAN
• ZHANG XIANGZE
• ZHOU DANDAN
• YUAN ZHIDONG

Assignees

• 京东方科技集团股份有限公司
• 合肥京东方卓印科技有限公司
• 北京京东方技术开发有限公司

Dates

Publication Date

20260512

Application Date

20240909

Claims (20)

1. 1. A method of operating a pixel driving circuit includes outputting driving currents to a plurality of light emitting elements, respectively, in a plurality of periods in one frame image; Wherein each of the plurality of light emitting elements is driven by a driving current output in a corresponding period of the plurality of periods; Wherein each cycle includes m periods; In each period of the one frame image, driving current is output to each light emitting element m times in m durations, respectively, and In at least one frame of image, at least two durations among the m durations in the respective periods are different from each other.
2. 2. The method of claim 1, wherein the pixel drive circuit further comprises a data write transistor and a switching transistor; Wherein the method further comprises: controlling the data writing transistor using the first gate line, and Providing a first voltage supply signal to the switching transistor; wherein a gate of the switching transistor is connected to the second electrode of the data writing transistor.
3. 3. The method of claim 2, each of the m periods in the respective periods, further comprising: Providing an effective voltage through the first gate line to turn on the data writing transistor so that a data signal passes through the data writing transistor, and An effective voltage having a corresponding duration of the m durations is supplied through the light emission control signal line to turn on the light emission control transistor.
4. 4. The method of claim 2, wherein the pixel driving circuit is configured to drive each light emitting element to emit light m times in the m periods of each cycle, respectively, and The gradation value of each light emitting element in the one frame image is a combination of the gradation values of the light emitting elements in the m periods.
5. 5. A method according to claim 2, wherein the pixel drive circuit comprises a plurality of select transistors; the method further includes controlling the plurality of selection transistors using a plurality of gate lines, respectively; wherein only one of the plurality of selection transistors is turned off by an inactive voltage supplied through one of the plurality of gate lines in each period.
6. 6. The method of claim 5, wherein the plurality of select transistors comprises a first select transistor, a second select transistor, and a third select transistor; the plurality of grid lines comprise a second grid line, a third grid line and a fourth grid line; The plurality of periods includes a first period, a second period, and a third period; Wherein the method further comprises: In the first period, an inactive voltage is provided through the second gate line to turn off the first selection transistor, an active voltage is provided through the third gate line to turn on the second selection transistor, and an active voltage is provided through the fourth gate line to turn on the third selection transistor; in the second period, an effective voltage is provided through the second gate line to turn on the first selection transistor, an ineffective voltage is provided through the third gate line to turn off the second selection transistor, and an effective voltage is provided through the fourth gate line to turn on the third selection transistor In the third period, an effective voltage is supplied through the second gate line to turn on the first selection transistor, an effective voltage is supplied through the third gate line to turn on the second selection transistor, and an ineffective voltage is supplied through the fourth gate line to turn on the third selection transistor.
7. 7. The method of claim 2, wherein the pixel drive circuit further comprises a light emission control transistor; the method further includes controlling the light emission control transistor using a light emission control signal line; Wherein the light emission control transistors are turned on m times in the m durations, respectively, by an effective voltage supplied through the light emission control signal lines in the respective periods of the one frame image.
8. 8. The method of claim 1, wherein the pixel driving circuit further comprises a first data writing transistor, a second data writing transistor, and a switching transistor; Wherein the method further comprises: controlling the first data writing transistor using a first gate line; Controlling the second data writing transistor using the fifth gate line, and Providing a first voltage supply signal to the switching transistor; Wherein a gate of the switching transistor is connected to second electrodes of the first data writing transistor and the second data writing transistor.
9. 9. The method of claim 8, a kth period of the m periods in the respective periods, further comprising: Providing an effective voltage through a first gate line in a first row to turn on a first data write transistor in a pixel driving circuit in the first row so that a data signal passes through the first data write transistor in the first row, and Providing an effective voltage through a fifth gate line in an (n/2) th row to turn on a second data writing transistor in a pixel driving circuit in the (n/2) th row so that a data signal passes through the second data writing transistor in the (n/2) th row; Wherein k is an integer of 1 or more and less than m, and N is the total number of rows of the pixel driving circuit.
10. 10. The method of claim 8, the (k+1) th period of the m periods in the respective periods, further comprising: Providing an effective voltage through a fifth gate line in a first row to turn on a second data writing transistor in a pixel driving circuit in the first row so that a data signal passes through the second data writing transistor in the first row, and Providing an effective voltage through a first gate line in an (n/2) th row to turn on a first data writing transistor in a pixel driving circuit in the (n/2) th row so that a data signal passes through the first data writing transistor in the (n/2) th row; Wherein k is an integer of 1 or more and less than m, and N is the total number of rows of the pixel driving circuit.
11. 11. The method of claim 8, each of the m periods in the respective periods, further comprising: providing an effective voltage having a first duration through the light emission control signal line in the first row to turn on the light emission control transistors in the first row, and Providing an active voltage having a second duration through a light emission control signal line in an (n/2) th row to turn on a light emission control transistor in the (n/2) th row; Where n is the total number of rows of the pixel driving circuit.
12. 12. The method according to claim 10, wherein the pixel driving circuit is configured to drive the light emission control transistors in the first row to emit light m times in the m periods in the respective periods, respectively, and to drive the light emission control transistors in the (n/2) th row to emit light m times in the m periods in the respective periods, respectively; The gray-scale values in the one frame image of the light-emitting elements in the first row are combinations of the gray-scale values in the m periods of the light-emitting elements in the first row, and The gradation value of the light emitting elements in the (n/2) th row in the one frame image is a combination of the gradation values of the light emitting elements in the (n/2) th row in the m periods.
13. 13. The method of claim 8, wherein the pixel drive circuit comprises a plurality of select transistors; the method further includes controlling the plurality of selection transistors using a plurality of gate lines, respectively; wherein, in each of the m periods in the respective periods, the method further comprises: Turning off only one of the plurality of selection transistors in the pixel driving circuit in the first row by an inactive voltage supplied through one of the plurality of gate lines in the first row, and Turning off only one of the plurality of selection transistors in the pixel driving circuit in the (n/2) th row by an inactive voltage supplied through one of the plurality of gate lines in the (n/2) th row; Where n is the total number of rows of the pixel driving circuit.
14. 14. The method of claim 13, wherein the plurality of select transistors comprises a first select transistor, a second select transistor, and a third select transistor; the plurality of grid lines comprise a second grid line, a third grid line and a fourth grid line; The plurality of periods includes a first period, a second period, and a third period; wherein, in each of the m periods in the first period, the method further comprises: Turning off the first selection transistor in the pixel driving circuit in the first row by an inactive voltage supplied through the second gate line in the first row; Turning on the second selection transistor in the pixel driving circuit in the first row by an effective voltage supplied through the third gate line in the first row, and Turning on the third selection transistor in the pixel driving circuit in the first row by an effective voltage supplied through the fourth gate line in the first row; Wherein, in each of the m periods in the second period, the method further comprises: turning on the first selection transistor in the pixel driving circuit in the first row by an effective voltage supplied through the second gate line in the first row; Turning off the second selection transistor in the pixel driving circuit in the first row by an inactive voltage supplied through the third gate line in the first row, and Turning on the third selection transistor in the pixel driving circuit in the first row by an effective voltage supplied through the fourth gate line in the first row; Wherein, in each of the m periods in the third period, the method further comprises: turning on the first selection transistor in the pixel driving circuit in the first row by an effective voltage supplied through the second gate line in the first row; Turning on the second selection transistor in the pixel driving circuit in the first row by an effective voltage supplied through the third gate line in the first row, and The third selection transistor in the pixel driving circuit in the first row is turned off by an inactive voltage supplied through the fourth gate line in the first row.
15. 15. The method of claim 8, wherein the pixel drive circuit further comprises a light emission control transistor; the method further includes controlling the light emission control transistor using a light emission control signal line; wherein, in the respective periods of the one frame image, the method further comprises: turning on the light emission control transistors in the pixel driving circuits in the first row m times for the m durations, respectively, by an effective voltage supplied through the light emission control signal lines in the first row, and Turning on light emission control transistors in pixel driving circuits in an (n/2) th row m times within the m durations, respectively, by an effective voltage supplied through a light emission control signal line in the (n/2) th row; Where n is the total number of rows of the pixel driving circuit.
16. 16. The method of any of claims 1-15, wherein the plurality of periods do not overlap each other and the m periods do not overlap each other.
17. 17. A method according to any one of claims 1 to 16, wherein the number of the plurality of periods is the number of light emitting elements driven by the pixel driving circuit.
18. 18. The method according to any one of claims 1 to 17, wherein m = 8.
19. 19. A method according to any one of claims 1 to 18, wherein all transistors of the pixel drive circuit operate in a linear region.
20. 20. A display device comprising a display panel having pixel driving circuitry driven by the method according to any one of claims 1 to 19.

Description

Method of operating pixel driving circuit and display device Technical Field The present invention relates to display technology, and more particularly, to a method of operating a pixel driving circuit and a display device. Background Organic Light Emitting Diode (OLED) displays are one of the hot spots in the field of flat panel display research today. Unlike a thin film transistor-liquid crystal display (TFT-LCD) that controls brightness using a stable voltage, an OLED is driven by a driving current that needs to be kept constant to control brightness. The OLED display panel includes a plurality of pixel units configured with pixel driving circuits arranged in a plurality of rows and a plurality of columns. Each pixel driving circuit includes a driving transistor having a gate terminal connected to one gate line of each row and a drain terminal connected to one data line of each column. When the row of the pixel unit is turned on, the switching transistor connected to the driving transistor is turned on, and the data voltage is applied from the data line to the driving transistor via the switching transistor, so that the driving transistor outputs a current corresponding to the data voltage to the OLED device. The OLED device is driven to emit light of a corresponding brightness. Disclosure of Invention In one aspect, the present disclosure provides a method of operating a pixel driving circuit, including outputting driving currents to a plurality of light emitting elements, respectively, in a plurality of periods in one frame image, wherein each of the plurality of light emitting elements is driven by the driving current output in a corresponding period of the plurality of periods, wherein each period includes m periods, driving currents are output to each of the light emitting elements m times in m durations, respectively, in each period of the one frame image, and at least two durations of the m durations in each period are different from each other in at least one frame image. Optionally, the pixel driving circuit further comprises a data writing transistor and a switching transistor, wherein the method further comprises controlling the data writing transistor by using a first gate line, and providing a first voltage supply signal to the switching transistor, wherein a gate of the switching transistor is connected to a second electrode of the data writing transistor. Optionally, in each of the m periods in the respective periods, the method further includes providing an effective voltage through the first gate line to turn on the data writing transistor such that a data signal passes through the data writing transistor, and providing an effective voltage through the light emission control signal line having a corresponding one of the m durations to turn on the light emission control transistor. Optionally, the pixel driving circuit is configured to drive each light emitting element to emit light m times in the m periods of each cycle, respectively, and the gray scale value of each light emitting element in the one frame image is a combination of the gray scale values of the light emitting element in the m periods. The pixel driving circuit comprises a plurality of selection transistors, wherein the method further comprises controlling the plurality of selection transistors by using a plurality of grid lines respectively, and wherein in each period, only one selection transistor in the plurality of selection transistors is turned off by an invalid voltage provided by one grid line in the plurality of grid lines. The method further comprises the steps of providing an inactive voltage through the second grid line to enable the first selection transistor to be turned off, providing an active voltage through the third grid line to enable the second selection transistor to be turned on, providing an active voltage through the third grid line to enable the third selection transistor to be turned on, providing an active voltage through the fourth grid line to enable the third selection transistor to be turned on, providing an active voltage through the second grid line to enable the first selection transistor to be turned on, providing an inactive voltage through the third grid line to enable the third selection transistor to be turned off, providing an active voltage through the third grid line to enable the third selection transistor to be turned on, and providing an active voltage through the third grid line to enable the second selection transistor to be turned off, and providing an active voltage through the fourth grid line to enable the third selection transistor to be turned on. The pixel driving circuit further comprises a light-emitting control transistor, wherein the method further comprises controlling the light-emitting control transistor by using a light-emitting control signal line, and the light-emitting control transistor is respectively conducted m times in m duration periods by an effective