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CN-122024652-A - Pixel circuit, display panel, display driving chip and display driving method thereof

CN122024652ACN 122024652 ACN122024652 ACN 122024652ACN-122024652-A

Abstract

The embodiment of the application provides a pixel circuit, a display panel, a display driving chip and a display driving method thereof, relates to the technical field of electronics, and improves the low-brightness display effect of an OLED display panel with a multi-luminous-layer structure. The driving circuit is used for receiving data signals and providing driving current for the light emitting device, the light emitting device comprises a first light emitting unit and a second light emitting unit, the first end of the first light emitting unit is coupled with the driving circuit, the second end of the first light emitting unit is coupled with the first end of the second light emitting unit, the second end of the second light emitting unit is coupled with a power voltage end, the first end of the control circuit is coupled with the first end of the second light emitting unit, the second end of the control circuit is coupled with the first voltage end, the control end of the control circuit is used for receiving control signals, and the control circuit is used for controlling the on or off of the first voltage end and the first end of the second light emitting unit under the control of the control signals. The embodiment of the application is used for driving the pixel circuit.

Inventors

  • ZHONG JIEXING
  • Lei Haohan

Assignees

  • 华为技术有限公司

Dates

Publication Date
20260512
Application Date
20250121

Claims (13)

  1. 1. A pixel circuit is characterized by comprising a driving circuit, a light emitting device and a control circuit; the driving circuit is used for receiving the data signal and providing driving current for the light-emitting device; the light emitting device comprises a first light emitting unit and a second light emitting unit, wherein a first end of the first light emitting unit is coupled with the driving circuit, a second end of the first light emitting unit is coupled with a first end of the second light emitting unit, and a second end of the second light emitting unit is coupled with a power supply voltage end; the first end of the control circuit is coupled with the first end of the second light-emitting unit, the second end of the control circuit is coupled with the first voltage end, and the control end of the control circuit is used for receiving a control signal; the control circuit is used for controlling the on or off of the first voltage end and the first end of the second light-emitting unit under the control of the control signal.
  2. 2. The pixel circuit according to claim 1, wherein a difference between the voltage value received by the first voltage terminal and the voltage value received by the power voltage terminal is smaller than an on voltage of the second light emitting unit.
  3. 3. A pixel circuit according to claim 1 or 2, wherein the control signals comprise a first control signal and a second control signal; The control circuit is used for controlling the first voltage end to be conducted with the first end of the second light-emitting unit under the control of the first control signal, transmitting the voltage of the first voltage end to the first end of the second light-emitting unit, and controlling the first light-emitting unit to emit light; And under the control of the second control signal, the first voltage end and the first end of the second light-emitting unit are controlled to be turned off, and the first light-emitting unit and the second light-emitting unit are controlled to emit light.
  4. 4. A pixel circuit according to any one of claims 1-3, wherein the control circuit comprises a first transistor; The first end of the first transistor is coupled with the first end of the second light emitting unit, the second end of the first transistor is coupled with the first voltage end, and the control end of the first transistor is used for receiving the control signal.
  5. 5. The pixel circuit according to any one of claims 1 to 4, wherein the light emitting device further comprises a third light emitting unit; The first end of the third light emitting unit is coupled to the second end of the second light emitting unit, and the second end of the third light emitting unit is coupled to the power supply voltage end.
  6. 6. A pixel circuit according to any one of claims 1 to 5, wherein the drive circuit comprises a drive transistor; the drive transistor includes a first terminal, a second terminal, a bottom gate and a top gate, the bottom gate and the first terminal being coupled.
  7. 7. A display panel comprising a plurality of pixel circuits according to any one of claims 1 to 6, the plurality of pixel circuits being arranged in a plurality of rows and a plurality of columns.
  8. 8. The display panel of claim 7, further comprising a gate drive circuit comprising a cascaded multi-stage gate array drive circuit; The control terminals of the control circuits in the pixel circuits in the same row are coupled to the output terminals of the same gate array drive circuit.
  9. 9. A display driving chip, wherein the display driving chip is used for driving a display panel, the display panel comprises a pixel circuit, and the pixel circuit comprises a control circuit; The display driving chip is used for receiving a first instruction representing first luminous brightness, sending a first start control signal, and controlling the control circuit to be conducted; The display driving chip is further used for receiving a second instruction representing second luminous brightness and sending a second initial control signal, the second initial control signal is used for controlling the control circuit to be turned off, and the second luminous brightness is larger than the first luminous brightness.
  10. 10. The display module is characterized by comprising a display driving chip and a display panel, wherein the display driving chip is coupled with the display panel; the display panel comprising the display panel according to claim 7 or 8; And/or the number of the groups of groups, The display driver chip comprising the display driver chip of claim 9.
  11. 11. An electronic device, comprising a housing and the display module of claim 10, wherein the display module is disposed within the housing.
  12. 12. A display driving method, wherein the driving method is applied to an electronic device including a display driving chip and a display panel including a pixel circuit including a control circuit, the display driving method comprising: the display driving chip receives a first instruction representing first luminous brightness, sends a first starting control signal to the display panel, and the control circuit is conducted under the control of the first starting control signal; The display driving chip receives a second instruction representing second luminous brightness, sends a second initial control signal to the display panel, and is turned off under the control of the second initial control signal, wherein the second luminous brightness is larger than the first luminous brightness.
  13. 13. The display driving method according to claim 12, wherein the pixel circuit further includes a first light emitting unit and a second light emitting unit connected in series, the display driving method further comprising: the control circuit is conducted under the control of the first starting control signal and then controls the first light-emitting unit to emit light; and the control circuit controls the first light-emitting unit and the second light-emitting unit to emit light after being turned off under the control of the second initial control signal.

Description

Pixel circuit, display panel, display driving chip and display driving method thereof Technical Field The embodiment of the application relates to the technical field of electronics, in particular to a pixel circuit, a display panel, a display driving chip and a display driving method thereof. Background With the development of display panel technology, the display panel gradually evolves to a higher brightness direction. Taking an Organic LIGHT EMITTING Diode (OLED) display panel as an example, in order to achieve higher brightness, the structure of the OLED display panel is gradually developed from a single light emitting layer structure to a multiple light emitting layer structure. Under the same light-emitting power consumption condition, the OLED display panel with the multiple light-emitting layer structure can achieve higher brightness. Under the same brightness, the OLED display panel with the multi-light-emitting layer structure can effectively reduce light-emitting power consumption. However, the OLED display panel with the multi-light-emitting layer structure generally has the problem of poor low-brightness display effect. Disclosure of Invention The embodiment of the application provides a pixel circuit, a display panel, a display driving chip and a display driving method thereof, which improve the low-brightness display effect of an OLED display panel with a multi-luminous-layer structure. In order to achieve the above purpose, the following technical scheme is adopted in the embodiment of the application. In a first aspect of an embodiment of the present application, there is provided a pixel circuit including a driving circuit, a light emitting device, and a control circuit. The driving circuit is used for receiving the data signal and providing driving current for the light emitting device, the light emitting device comprises a first light emitting unit and a second light emitting unit, the first end of the first light emitting unit is coupled with the driving circuit, the second end of the first light emitting unit is coupled with the first end of the second light emitting unit, the second end of the second light emitting unit is coupled with the power voltage end, the first end of the control circuit is coupled with the first end of the second light emitting unit, the second end of the control circuit is coupled with the first voltage end, the control end of the control circuit is used for receiving the control signal, and the control circuit is used for controlling the on or off of the first voltage end and the first end of the second light emitting unit under the control of the control signal. The pixel circuit provided by the embodiment of the application is additionally provided with the control circuit, so that the pixel circuit can be controlled by the control circuit to turn on or off the first voltage terminal and the first terminal of the second light-emitting unit. For example, when the first voltage terminal and the first terminal of the second light emitting unit are turned off, the first light emitting unit and the second light emitting unit may normally emit light under a driving current of the driving circuit. Because the pixel circuit adopts a structure of a plurality of light emitting units, the driving current and the light emitting power consumption of the OLED display panel applied by the pixel circuit can be effectively reduced under the same brightness. In addition, when the first voltage end and the first end of the second light emitting unit are conducted, the voltage value received by the first voltage end is transmitted to the first end of the second light emitting unit, the voltage value received by the first voltage end can be smaller than the starting voltage of the second light emitting unit, at this time, only the first light emitting unit emits light in the pixel circuit, and the second light emitting unit does not emit light. At this time, the pixel circuit adopts a structure of a single light emitting unit, so that the driving current in a low-brightness scene with smaller driving current can be improved, the display uniformity is improved, and the display effect is improved. Based on the above, the pixel circuit provided by the embodiment of the application is applied to the OLED display panel with the multi-luminous-layer structure, and can improve the low-brightness display effect of the OLED display panel with the multi-luminous-layer structure. In one possible implementation, the difference between the voltage value received by the first voltage terminal and the voltage value received by the power supply voltage terminal is smaller than the turn-on voltage of the second light emitting unit. When the first voltage end is conducted with the first end of the second light-emitting unit, the voltage value received by the first voltage end is transmitted to the first end of the second light-emitting unit, and the voltage value at the two ends of the second