CN-117999600-B - Pixel circuit, pixel driving method and display device

Abstract

The present disclosure provides a pixel circuit, a pixel driving method, and a display device. The pixel circuit comprises a driving circuit, a light emitting element and a light emitting gating control circuit, wherein the driving circuit is electrically connected with a first electrode of the light emitting element and used for driving the light emitting element, and the light emitting gating control circuit is controlled by a first control signal provided by a first control end, and forms a current path between a second electrode of the light emitting element and the first voltage end or a current path between the driving circuit and the light emitting element according to a first light emitting control voltage provided by a first light emitting control voltage end and a light emitting data voltage provided by a light emitting data voltage end so as to control the driving circuit to control the light emitting element to emit light. The present disclosure proposes an external compensation pixel circuit with pulse width modulation function that achieves low gray scale, facilitating high PPI (Pixels Per Inch, pixel density).

Inventors

• ZHAO JIAO
• GUO YUZHEN
• ZHENG HAOLIANG
• XIAO LI
• ZHANG CHENYANG
• CUI XIAORONG
• XUAN MINGHUA
• CHEN WANZHI
• QU YAN

Assignees

• 京东方科技集团股份有限公司

Dates

Publication Date

20260508

Application Date

20220901

Claims (20)

1. 1. A pixel circuit is characterized by comprising a driving circuit, a light emitting element and a light emitting gating control circuit; The drive circuit is electrically connected with the first electrode of the light emitting element and used for driving the light emitting element, the light emitting gating control circuit is respectively electrically connected with the second electrode of the light emitting element, the first control end, the first light emitting control voltage end and the light emitting data voltage end and used for forming a current path between the second electrode of the light emitting element and the first voltage end according to the first light emitting control voltage provided by the first light emitting control voltage end and the light emitting data voltage provided by the light emitting data voltage end under the control of a first control signal provided by the first control end so as to control the drive circuit to control the light emitting element to emit light, or The light-emitting gating control circuit is respectively and electrically connected with the driving circuit, a first control end, a first control voltage end and a light-emitting data voltage end and is used for forming a current path between the driving circuit and the light-emitting element according to the first light-emitting control voltage and the light-emitting data voltage under the control of the first control signal so as to control the driving circuit to control the light-emitting element to emit light; the luminous gating control circuit is also electrically connected with a luminous control signal end and is also used for forming the current path according to a luminous control signal provided by the luminous control signal end; the light-emitting gating control circuit comprises a third light-emitting control circuit, a writing control circuit, a first control circuit and a third energy storage circuit; the writing control circuit is respectively and electrically connected with the first control end, the first light-emitting control voltage end and the writing node and is used for controlling the communication between the first light-emitting control voltage end and the writing node under the control of a first control signal provided by the first control end; the first control circuit is electrically connected with the control end of the third light-emitting control circuit, the writing node, the light-emitting data voltage end and the light-emitting control signal end respectively and is used for controlling the light-emitting control signal provided by the light-emitting data voltage or the light-emitting control signal end to be written into the control end of the third light-emitting control circuit under the control of the potential of the writing node; the third light-emitting control circuit is respectively and electrically connected with the second pole and the first voltage end of the light-emitting element, and is used for forming the current path under the control of the potential of the control end of the third light-emitting control circuit; the first end of the third energy storage circuit is electrically connected with the writing node, the second end of the third energy storage circuit is electrically connected with the initial voltage end, and the third energy storage circuit is used for storing electric energy.
2. 2. The pixel circuit according to claim 1, wherein the write control circuit includes a sixth transistor, the first control circuit includes a seventh transistor and an eighth transistor, and the third light emission control circuit includes a ninth transistor; The control electrode of the sixth transistor is electrically connected with the first control end, the first electrode of the sixth transistor is electrically connected with the first light-emitting control voltage end, and the second electrode of the sixth transistor is electrically connected with the writing node; a control electrode of the seventh transistor is electrically connected with the writing node, a first electrode of the seventh transistor is electrically connected with the light-emitting data voltage end, and a second electrode of the seventh transistor is electrically connected with a control electrode of the ninth transistor; The control electrode of the eighth transistor is electrically connected with the writing node, the first electrode of the eighth transistor is electrically connected with the light-emitting control signal end, and the second electrode of the eighth transistor is electrically connected with the control electrode of the ninth transistor; The first pole of the ninth transistor is electrically connected to the second pole of the light emitting element, and the second pole of the ninth transistor is electrically connected to the first voltage terminal.
3. 3. The pixel circuit according to claim 2, wherein the sixth transistor is an n-type transistor, and wherein the sixth transistor is an oxide transistor.
4. 4. The pixel circuit according to claim 2, wherein the seventh transistor is a p-type transistor, the eighth transistor is an n-type transistor, or the seventh transistor is an n-type transistor, and the eighth transistor is a p-type transistor.
5. 5. The pixel circuit of claim 2 wherein the sixth transistor is a p-type transistor, the seventh transistor is a p-type transistor, and the eighth transistor is an n-type transistor, or The sixth transistor is an n-type transistor, the seventh transistor is a p-type transistor, and the eighth transistor is an n-type transistor.
6. 6. The pixel circuit according to any one of claims 1 to 5, further comprising a data writing circuit and a compensation on-off circuit, wherein the first terminal of the driving circuit is electrically connected to the second voltage terminal; The data writing circuit is respectively and electrically connected with the first scanning line, the data line and the control end of the driving circuit and is used for writing the data voltage provided by the data line into the control end of the driving circuit under the control of the first scanning signal provided by the first scanning line; the compensation on-off circuit is respectively and electrically connected with the second scanning line, the external compensation line and the second end of the driving circuit, and is used for controlling the communication between the external compensation line and the second end of the driving circuit under the control of a second scanning signal provided by the second scanning line.
7. 7. The pixel circuit of claim 6, wherein the pixel circuit further comprises a sixth tank circuit; The first end of the sixth energy storage circuit is electrically connected with the control end of the driving circuit, the second end of the sixth energy storage circuit is electrically connected with the second end of the driving circuit, and the sixth energy storage circuit is used for storing electric energy, or The first end of the sixth energy storage circuit is electrically connected with the control end of the driving circuit, the second end of the sixth energy storage circuit is electrically connected with the first end of the driving circuit, and the sixth energy storage circuit is used for storing electric energy.
8. 8. The pixel circuit according to claim 6, wherein the data writing circuit includes a seventeenth transistor, the compensation on-off circuit includes an eighteenth transistor, and the driving circuit includes a driving transistor; A control electrode of the seventeenth transistor is electrically connected to the first scan line, a first electrode of the seventeenth transistor is electrically connected to the data line, and a second electrode of the seventeenth transistor is electrically connected to the gate electrode of the driving transistor; A control electrode of the eighteenth transistor is electrically connected to the second scan line, a first electrode of the eighteenth transistor is electrically connected to the external compensation line, and a second electrode of the eighteenth transistor is electrically connected to the second electrode of the driving transistor; The first electrode of the driving transistor is electrically connected with the second voltage end, and the second electrode of the driving transistor is electrically connected with the first electrode of the light emitting element.
9. 9. The pixel circuit according to claim 8, wherein the seventeenth transistor, the eighteenth transistor, and the driving transistor are each an n-type transistor, or wherein the seventeenth transistor and the driving transistor are each a p-type transistor, and wherein the eighteenth transistor is an n-type transistor or a p-type transistor.
10. 10. The pixel circuit of claim 7 wherein the sixth tank circuit comprises a storage capacitor, the drive circuit comprises a drive transistor; a first end of the storage capacitor is electrically connected with the control electrode of the driving transistor, a second end of the storage capacitor is electrically connected with the second electrode of the driving transistor, or The first end of the storage capacitor is electrically connected with the control electrode of the driving transistor, and the second end of the storage capacitor is electrically connected with the first electrode of the driving transistor.
11. 11. The pixel circuit according to any one of claims 1 to 5, further comprising a data writing circuit, a compensation on-off circuit and a sixth energy storage circuit, wherein the first terminal of the driving circuit is electrically connected to the second voltage terminal; The data writing circuit is respectively and electrically connected with the first scanning line, the data line and the control end of the driving circuit and is used for writing the data voltage provided by the data line into the control end of the driving circuit under the control of the first scanning signal provided by the first scanning line; the compensation on-off circuit is respectively and electrically connected with the second scanning line, the external compensation line and the control end of the driving circuit and is used for controlling the communication between the external compensation line and the control end of the driving circuit under the control of a second scanning signal provided by the second scanning line; the first end of the sixth energy storage circuit is electrically connected with the control end of the driving circuit, the second end of the sixth energy storage circuit is electrically connected with the first end of the driving circuit, and the sixth energy storage circuit is used for storing electric energy.
12. 12. The pixel circuit according to claim 11, wherein the data writing circuit includes a seventeenth transistor, the compensation on-off circuit includes an eighteenth transistor, and the driving circuit includes a driving transistor; A control electrode of the seventeenth transistor is electrically connected to the first scan line, a first electrode of the seventeenth transistor is electrically connected to the data line, and a second electrode of the seventeenth transistor is electrically connected to the gate electrode of the driving transistor; A control electrode of the eighteenth transistor is electrically connected with the second scanning line, a first electrode of the eighteenth transistor is electrically connected with the external compensation line, and a second electrode of the eighteenth transistor is electrically connected with the control electrode of the driving transistor; The first electrode of the driving transistor is electrically connected with the second voltage end, and the second electrode of the driving transistor is electrically connected with the first electrode of the light emitting element.
13. 13. The pixel circuit according to claim 12, wherein the seventeenth transistor, the eighteenth transistor, and the driving transistor are p-type transistors.
14. 14. A pixel circuit is characterized by comprising a driving circuit, a light emitting element and a light emitting gating control circuit; The drive circuit is electrically connected with the first electrode of the light emitting element and used for driving the light emitting element, the light emitting gating control circuit is respectively electrically connected with the second electrode of the light emitting element, the first control end, the first light emitting control voltage end and the light emitting data voltage end and used for forming a current path between the second electrode of the light emitting element and the first voltage end according to the first light emitting control voltage provided by the first light emitting control voltage end and the light emitting data voltage provided by the light emitting data voltage end under the control of a first control signal provided by the first control end so as to control the drive circuit to control the light emitting element to emit light, or The light-emitting gating control circuit is respectively and electrically connected with the driving circuit, a first control end, a first control voltage end and a light-emitting data voltage end and is used for forming a current path between the driving circuit and the light-emitting element according to the first light-emitting control voltage and the light-emitting data voltage under the control of the first control signal so as to control the driving circuit to control the light-emitting element to emit light; The light-emitting gating control circuit comprises a sixth light-emitting control circuit, a seventh light-emitting control circuit, a fourth gating control circuit, a fifth gating control circuit and a fifth energy storage circuit; the fourth gating control circuit is electrically connected with the first control end, the first light-emitting control voltage end and the control end of the sixth light-emitting control circuit respectively and is used for controlling the first light-emitting control voltage end to be communicated with the control end of the sixth light-emitting control circuit under the control of the first control signal; The fifth gating control circuit is electrically connected with the control end of the sixth light-emitting control circuit, the light-emitting data voltage end and the control end of the seventh light-emitting control circuit respectively, and is used for controlling the light-emitting data voltage end to be electrically connected with the control end of the seventh light-emitting control circuit under the control of the potential of the control end of the sixth light-emitting control circuit; The sixth light-emitting control circuit is electrically connected with the second pole of the light-emitting element and the first voltage end respectively and is used for forming the current path under the control of the potential of the control end of the sixth light-emitting control circuit; the seventh light-emitting control circuit is electrically connected with the second pole of the light-emitting element and the first voltage end respectively and is used for forming the current path under the control of the potential of the control end of the seventh light-emitting control circuit; The first end of the fifth energy storage circuit is electrically connected with the control end of the sixth light-emitting control circuit, the second end of the fifth energy storage circuit is electrically connected with the initial voltage end, and the fifth energy storage circuit is used for storing electric energy.
15. 15. The pixel circuit of claim 14 wherein the sixth light emission control circuit comprises a thirteenth transistor, wherein the seventh light emission control circuit comprises a fourteenth transistor, wherein the fourth gate control circuit comprises a fifteenth transistor, and wherein the fifth gate control circuit comprises a sixteenth transistor; A control electrode of the fifteenth transistor is electrically connected with the first control end, a first electrode of the fifteenth transistor is electrically connected with a first light emitting control voltage end, and a second electrode of the fifteenth transistor is electrically connected with the control electrode of the thirteenth transistor; a control electrode of the sixteenth transistor is electrically connected with the control electrode of the thirteenth transistor, a first electrode of the sixteenth transistor is electrically connected with the light-emitting data voltage terminal, and a second electrode of the sixteenth transistor is electrically connected with the control electrode of the fourteenth transistor; a first pole of the thirteenth transistor is electrically connected with a second pole of the light emitting element, and a second pole of the thirteenth transistor is electrically connected with a first voltage terminal; The first pole of the fourteenth transistor is electrically connected to the second pole of the light emitting element, and the second pole of the fourteenth transistor is electrically connected to the first voltage terminal.
16. 16. The pixel circuit of claim 15 wherein the thirteenth transistor, the fourteenth transistor and the fifteenth transistor are all n-type transistors and the sixteenth transistor is a p-type transistor, or The thirteenth transistor and the fourteenth transistor are n-type transistors, the fifteenth transistor and the sixteenth transistor are p-type transistors, or The thirteenth transistor is an n-type transistor, the fourteenth transistor, the fifteenth transistor and the sixteenth transistor are p-type transistors, or The thirteenth transistor, the fourteenth transistor, and the fifteenth transistor are all n-type transistors, and the sixteenth transistor is a p-type transistor.
17. 17. The pixel circuit according to any one of claims 14 to 16, further comprising a data writing circuit and a compensation on-off circuit, wherein the first terminal of the driving circuit is electrically connected to the second voltage terminal; The data writing circuit is respectively and electrically connected with the first scanning line, the data line and the control end of the driving circuit and is used for writing the data voltage provided by the data line into the control end of the driving circuit under the control of the first scanning signal provided by the first scanning line; the compensation on-off circuit is respectively and electrically connected with the second scanning line, the external compensation line and the second end of the driving circuit, and is used for controlling the communication between the external compensation line and the second end of the driving circuit under the control of a second scanning signal provided by the second scanning line.
18. 18. The pixel circuit of claim 17, wherein the pixel circuit further comprises a sixth tank circuit; The first end of the sixth energy storage circuit is electrically connected with the control end of the driving circuit, the second end of the sixth energy storage circuit is electrically connected with the second end of the driving circuit, and the sixth energy storage circuit is used for storing electric energy, or The first end of the sixth energy storage circuit is electrically connected with the control end of the driving circuit, the second end of the sixth energy storage circuit is electrically connected with the first end of the driving circuit, and the sixth energy storage circuit is used for storing electric energy.
19. 19. The pixel circuit according to claim 17, wherein the data writing circuit includes a seventeenth transistor, the compensation on-off circuit includes an eighteenth transistor, and the driving circuit includes a driving transistor; A control electrode of the seventeenth transistor is electrically connected to the first scan line, a first electrode of the seventeenth transistor is electrically connected to the data line, and a second electrode of the seventeenth transistor is electrically connected to the gate electrode of the driving transistor; A control electrode of the eighteenth transistor is electrically connected to the second scan line, a first electrode of the eighteenth transistor is electrically connected to the external compensation line, and a second electrode of the eighteenth transistor is electrically connected to the second electrode of the driving transistor; The first electrode of the driving transistor is electrically connected with the second voltage end, and the second electrode of the driving transistor is electrically connected with the first electrode of the light emitting element.
20. 20. The pixel circuit of claim 19 wherein the seventeenth transistor, the eighteenth transistor, and the drive transistor are all n-type transistors, or wherein the seventeenth transistor and the drive transistor are p-type transistors, and wherein the eighteenth transistor is either an n-type transistor or a p-type transistor.

Description

Pixel circuit, pixel driving method and display device Technical Field The disclosure relates to the technical field of display, and in particular relates to a pixel circuit, a pixel driving method and a display device. Background Micro-LEDs (Micro light emitting diodes) have the characteristics of high resolution, low power consumption, high brightness, high contrast, high color saturation, high reaction speed, thin thickness, long service life and the like, and become iterations of future display. At present, TV (television) grade Micro-LED products are developed in the market successively, and medium and small-sized products displayed in near distance in the future are also gradually expanded, that is, the improvement requirement of PPI (Pixels Per Inch, pixel density) is continuously improved, the high PPI design requires a simple structure of a pixel circuit, and the structure of an internal compensation circuit is complex at present. In addition, when the Micro-LED display product performs low gray scale display, the brightness uniformity of an LED (light emitting diode) chip performing low current density driving is relatively poor, so that the completed pixel driving circuit needs to include two modules, namely, a compensation module having a threshold compensation function of a driving transistor and a dimming module having a pulse width modulation function. The internal compensation circuit with the two modules has a complex structure, which is unfavorable for realizing a narrow frame. Disclosure of Invention In one aspect, embodiments of the present disclosure provide a pixel circuit including a driving circuit, a light emitting element, and a light emitting gate control circuit; The drive circuit is electrically connected with the first electrode of the light emitting element and used for driving the light emitting element, the light emitting gating control circuit is respectively electrically connected with the second electrode of the light emitting element, the first control end, the first light emitting control voltage end and the light emitting data voltage end and used for forming a current path between the second electrode of the light emitting element and the first voltage end according to the first light emitting control voltage provided by the first light emitting control voltage end and the light emitting data voltage provided by the light emitting data voltage end under the control of a first control signal provided by the first control end so as to control the drive circuit to control the light emitting element to emit light, or The drive circuit is electrically connected with the light-emitting element through the light-emitting control circuit, and the light-emitting gating control circuit is respectively electrically connected with the drive circuit, a first control end, a first control voltage end and a light-emitting data voltage end and is used for forming a current path between the drive circuit and the light-emitting element according to the first light-emitting control voltage and the light-emitting data voltage under the control of the first control signal so as to control the drive circuit to control the light-emitting element to emit light. Optionally, the light-emitting gating control circuit is further electrically connected with a second light-emitting control voltage terminal, and is further configured to form the current path under the control of a second light-emitting control voltage provided by the second light-emitting control voltage terminal; the light-emitting gating control circuit comprises a first light-emitting control circuit, a second light-emitting control circuit, a first gating control circuit and a second gating control circuit; The first light-emitting control circuit is respectively and electrically connected with a first light-emitting control end, a second pole of the light-emitting element and a first voltage end and is used for controlling the communication between the second pole of the light-emitting element and the first voltage end under the control of the potential of the first light-emitting control end; The second light-emitting control circuit is respectively and electrically connected with a second light-emitting control end, a second electrode of the light-emitting element and a first voltage end and is used for controlling the communication between the second electrode of the light-emitting element and the first voltage end under the control of the potential of the second light-emitting control end; the first gating control circuit is respectively and electrically connected with a first control end, a first light-emitting control voltage end and the first light-emitting control end and is used for writing a first light-emitting control voltage provided by the first light-emitting control voltage end into the first light-emitting control end under the control of a first control signal provided by the first control end; The second gati