CN-116158211-B - Pixel circuit, pixel driving method, light-emitting substrate and light-emitting device

Abstract

A pixel circuit, a pixel driving method, a light emitting substrate and a light emitting device are provided, wherein the pixel circuit comprises a first driving circuit (21), a first light emitting device (22), a second light emitting device (23) and a second driving circuit (24) which are sequentially connected in series, the first driving circuit (21) comprises a first driving transistor (DT 1), a source electrode of the first driving transistor (DT 1) is connected with a first power supply end, a drain electrode of the first driving transistor (DT 1) is connected with a first electrode of the first light emitting device (22), the second driving circuit (24) comprises a second driving transistor (DT 2), a source electrode of the second driving transistor (DT 2) is connected with a second power supply end (26), a drain electrode of the second driving transistor (DT 2) is connected with a first electrode of the second light emitting device (23), and a second electrode of the first light emitting device (22) is connected with a second electrode of the second light emitting device (23), wherein channel types of the first driving transistor (DT 1) and the second driving transistor (DT 2) are different.

Inventors

• Sun tuo
• ZHOU YING
• ZHANG YICHI

Assignees

• 京东方科技集团股份有限公司
• 北京京东方技术开发有限公司

Dates

Publication Date

20260512

Application Date

20210830

Claims (18)

1. 1. The pixel circuit is characterized by comprising a first driving circuit, a first light emitting device, a second light emitting device and a second driving circuit which are sequentially connected in series; The first driving circuit comprises a first driving transistor, a source electrode of the first driving transistor is connected with a first power end, and a drain electrode of the first driving transistor is connected with a first pole of the first light emitting device; the second driving circuit comprises a second driving transistor, a source electrode of the second driving transistor is connected with a second power end, and a drain electrode of the second driving transistor is connected with a first electrode of the second light emitting device; A second electrode of the first light emitting device is connected with a second electrode of the second light emitting device; wherein the channel types of the first driving transistor and the second driving transistor are different.
2. 2. The pixel circuit of claim 1 wherein the channel type of the first drive transistor is P-type, the channel type of the second drive transistor is N-type, the first electrode of the first light emitting device is anode, the first electrode of the second light emitting device is cathode, the voltage input from the first power supply terminal is greater than the voltage input from the second power supply terminal, or The channel type of the first driving transistor is N type, the channel type of the second driving transistor is P type, the first electrode of the first light emitting device is cathode, the first electrode of the second light emitting device is anode, and the voltage input by the first power end is smaller than the voltage input by the second power end.
3. 3. The pixel circuit of claim 1, wherein the pixel circuit further comprises: and the bleeder structure is connected with a first node, and the first node is respectively connected with the second pole of the first light emitting device and the second pole of the second light emitting device and is used for enabling the difference between the current on the first light emitting device and the current on the second light emitting device to be equal to the current on the bleeder structure.
4. 4. A pixel circuit according to claim 3, wherein the drain structure comprises a first transistor and a second transistor of the same channel type; A first pole of the first transistor is connected with a first voltage input end, and a second pole of the first transistor and a grid electrode of the first transistor are respectively connected with the first node; The first electrode of the second transistor is connected with the first node, and the second electrode of the second transistor and the grid electrode of the second transistor are respectively connected with a second voltage input end.
5. 5. The pixel circuit according to any one of claims 1 to 4, wherein the first driving circuit includes: a first electrode of the first capacitor is connected with the first power supply end, and a second electrode of the first capacitor is connected with the grid electrode of the first driving transistor; The first reset module is used for transmitting a signal of a first initialization voltage end to the grid electrode of the first driving transistor and the second pole of the first capacitor in a first reset stage; The first writing module is used for writing the data signal of the first data writing end into the source electrode of the first driving transistor in a first writing stage; the first compensation module is used for conducting the drain electrode of the first driving transistor and the grid electrode of the first driving transistor in a first writing stage; The first light emitting control module is used for disconnecting the source electrode of the first driving transistor from the first power supply end, disconnecting the drain electrode of the first driving transistor from the first electrode of the first light emitting device in a first reset stage and a first writing stage, conducting the source electrode of the first driving transistor from the first power supply end and conducting the drain electrode of the first driving transistor from the first electrode of the first light emitting device in a light emitting stage; the second driving circuit includes: The first electrode of the second capacitor is connected with the second power supply end, and the second electrode of the second capacitor is connected with the grid electrode of the second driving transistor; The second reset module is used for transmitting a signal of a second initialization voltage end to the grid electrode of the second driving transistor and a second pole of the second capacitor in a second reset stage; The second writing module is used for writing the data signal of the second data writing end into the source electrode of the second driving transistor in a second writing stage; the second compensation module is used for conducting the drain electrode of the second driving transistor and the grid electrode of the second driving transistor in a second writing stage; The second light-emitting control module is used for disconnecting the source electrode of the second driving transistor from the second power supply end, disconnecting the drain electrode of the second driving transistor from the first electrode of the second light-emitting device in a second reset stage and a second writing stage, conducting the source electrode of the second driving transistor from the second power supply end and conducting the drain electrode of the second driving transistor from the first electrode of the second light-emitting device in a light-emitting stage.
6. 6. A light-emitting substrate comprising the pixel circuit according to any one of claims 1 to 5.
7. 7. The light-emitting substrate according to claim 6, wherein the light-emitting substrate comprises a plurality of pixel units, and the first light-emitting device and the second light-emitting device are located in the same pixel unit.
8. 8. The light-emitting substrate according to claim 7, wherein the pixel circuit further comprises a third light-emitting device and a third driver circuit in the same pixel unit; the third driving circuit comprises a third driving transistor, a source electrode of the third driving transistor is connected with the second power supply end, and a drain electrode of the third driving transistor is connected with a first electrode of the third light emitting device; The second pole of the third light emitting device is respectively connected with the second pole of the first light emitting device and the second pole of the second light emitting device; The channel type of the third driving transistor is the same as that of the second driving transistor.
9. 9. The light-emitting substrate according to claim 8, wherein the first light-emitting device is a light-emitting device capable of emitting blue light, the second light-emitting device is a light-emitting device capable of emitting green light, and the third light-emitting device is a light-emitting device capable of emitting red light.
10. 10. The light-emitting substrate according to claim 8, wherein the plurality of pixel units includes a first pixel unit and/or a second pixel unit, each of the first pixel unit and the second pixel unit including the pixel circuit; In the first pixel unit, the channel types of the first driving transistor are P-type, the channel types of the second driving transistor and the third driving transistor are N-type, the first electrode of the first light emitting device is an anode, the first electrode of the second light emitting device and the third light emitting device is a cathode, and the voltage input by the first power supply end is greater than the voltage input by the second power supply end; In the second pixel unit, the channel type of the first driving transistor is N-type, the channel types of the second driving transistor and the third driving transistor are P-type, the first electrode of the first light emitting device is a cathode, the first electrodes of the second light emitting device and the third light emitting device are anodes, and the voltage input by the first power supply end is smaller than the voltage input by the second power supply end.
11. 11. The light-emitting substrate according to claim 10, wherein when the plurality of pixel units includes the first pixel unit and the second pixel unit, the first pixel unit and the second pixel unit satisfy any one of the following conditions: the first pixel unit and the second pixel unit are respectively positioned on different scanning lines in two adjacent scanning lines; the first pixel unit and the second pixel unit are respectively positioned in different data columns in two adjacent data columns; at least one of the pixel units adjacent to the first pixel unit is the second pixel unit, and at least one of the pixel units adjacent to the second pixel unit is the first pixel unit.
12. 12. The light-emitting substrate according to claim 6, wherein the light-emitting substrate comprises a plurality of pixel units including a third pixel unit and a fourth pixel unit, wherein the first light-emitting device is located in the third pixel unit, and wherein the second light-emitting device is located in the fourth pixel unit.
13. 13. The light-emitting substrate according to claim 12, wherein the third pixel unit comprises at least one first sub-pixel unit, wherein one first light-emitting device and one first driving circuit are arranged in each first sub-pixel unit, and the first light-emitting devices in different first sub-pixel units are different; The fourth pixel unit comprises at least one second sub-pixel unit, one second light-emitting device and one second driving circuit are arranged in each second sub-pixel unit, and second light-emitting devices in different second sub-pixel units are different; wherein the second pole of any one of the first light emitting devices in the third pixel unit is connected with the second pole of each of the second light emitting devices in the fourth pixel unit.
14. 14. The light-emitting substrate according to claim 13, wherein the third pixel unit and the fourth pixel unit are two adjacent pixel units, and wherein the third pixel unit and the fourth pixel unit satisfy any one of the following conditions: The third pixel unit and the fourth pixel unit are respectively positioned on different scanning lines in two adjacent scanning lines; the third pixel unit and the fourth pixel unit are respectively positioned in different data columns in two adjacent data columns; The pixel unit adjacent to the third pixel unit is the fourth pixel unit, and the pixel unit adjacent to the fourth pixel unit is the third pixel unit.
15. 15. The light-emitting device according to claim 13, wherein the channel types of the first driving transistors in the third pixel unit are P-type, the first electrodes of the first light-emitting devices are anodes, the channel types of the second driving transistors in the fourth pixel unit are N-type, the first electrodes of the second light-emitting devices are cathodes, and the voltage input from the first power source terminal is greater than the voltage input from the second power source terminal, or The channel types of the first driving transistors in the third pixel unit are N-type, the first poles of the first light emitting devices are cathodes, the channel types of the second driving transistors in the fourth pixel unit are P-type, the first poles of the second light emitting devices are anodes, and the voltage input by the first power supply end is smaller than the voltage input by the second power supply end.
16. 16. A light-emitting device comprising the light-emitting substrate according to any one of claims 6 to 15.
17. 17. A driving method of a pixel circuit for driving the pixel circuit according to claim 5, comprising: And in the light-emitting stage, the first light-emitting device and the second light-emitting device are controlled to emit light synchronously.
18. 18. The driving method according to claim 17, wherein when the first driving circuit includes the first capacitor, the first reset module, the first write module, the first compensation module, and the first light emission control module, the second driving circuit includes the second capacitor, the second reset module, the second write module, the second compensation module, and the second light emission control module, before the light emission phase, further comprising: A first reset stage, wherein a signal for controlling a first initialization voltage terminal is transmitted to a grid electrode of the first driving transistor and a second electrode of the first capacitor, a source electrode of the first driving transistor is controlled to be disconnected from the first power supply terminal, and a drain electrode of the first driving transistor is controlled to be disconnected from a first electrode of the first light emitting device; A first writing stage, in which a data signal at a first data writing end is controlled to be written into a source electrode of the first driving transistor, a drain electrode of the first driving transistor is controlled to be conducted with a grid electrode of the first driving transistor, the source electrode of the first driving transistor is controlled to be disconnected with the first power end, and the drain electrode of the first driving transistor is controlled to be disconnected with a first electrode of the first light emitting device; a second reset stage, controlling a signal of a second initialization voltage terminal to be transmitted to a grid electrode of the second driving transistor and a second electrode of the second capacitor, controlling a source electrode of the second driving transistor to be disconnected from the second power supply terminal, and controlling a drain electrode of the second driving transistor to be disconnected from a first electrode of the second light emitting device; A second writing stage, controlling a data signal of a second data writing end to be written into a source electrode of the second driving transistor, controlling a drain electrode of the second driving transistor to be conducted with a grid electrode of the second driving transistor, controlling the source electrode of the second driving transistor to be disconnected with the second power end, and controlling the drain electrode of the second driving transistor to be disconnected with a first electrode of the second light emitting device; The light-emitting stage further comprises the steps of controlling the source electrode of the first driving transistor to be conducted with the first power supply end, controlling the drain electrode of the first driving transistor to be conducted with the first electrode of the first light-emitting device, controlling the source electrode of the second driving transistor to be conducted with the second power supply end, and controlling the drain electrode of the second driving transistor to be conducted with the first electrode of the second light-emitting device; Wherein the second reset phase is performed in synchronization with the first write phase.

Description

Pixel circuit, pixel driving method, light-emitting substrate and light-emitting device Technical Field The disclosure relates to the field of photoelectric technology, and in particular, to a pixel circuit, a pixel driving method, a light-emitting substrate and a light-emitting device. Background For a light emitting substrate of an Active-matrix organic light-emitting diode (AMOLED) or an Active-matrix Quantum Dot light-emitting diode (AMQLED) structure, in order to ensure luminance uniformity among the light emitting pixels, it is necessary to determine a driving voltage of each pixel according to a luminance maximum value of each light emitting pixel, while also ensuring that a driving transistor of each light emitting pixel remains at a saturation region output. Disclosure of Invention The present disclosure provides a pixel circuit including a first driving circuit, a first light emitting device, a second light emitting device, and a second driving circuit sequentially connected in series; The first driving circuit comprises a first driving transistor, a source electrode of the first driving transistor is connected with a first power end, and a drain electrode of the first driving transistor is connected with a first pole of the first light emitting device; the second driving circuit comprises a second driving transistor, a source electrode of the second driving transistor is connected with a second power end, and a drain electrode of the second driving transistor is connected with a first electrode of the second light emitting device; A second electrode of the first light emitting device is connected with a second electrode of the second light emitting device; wherein the channel types of the first driving transistor and the second driving transistor are different. In an alternative implementation, the channel type of the first driving transistor is P-type, the channel type of the second driving transistor is N-type, the first electrode of the first light emitting device is anode, the first electrode of the second light emitting device is cathode, the voltage input by the first power supply terminal is greater than the voltage input by the second power supply terminal The channel type of the first driving transistor is N type, the channel type of the second driving transistor is P type, the first electrode of the first light emitting device is cathode, the first electrode of the second light emitting device is anode, and the voltage input by the first power end is smaller than the voltage input by the second power end. In an alternative implementation, the pixel circuit further includes: and the bleeder structure is connected with a first node, and the first node is respectively connected with the second pole of the first light emitting device and the second pole of the second light emitting device and is used for enabling the difference between the current on the first light emitting device and the current on the second light emitting device to be equal to the current on the bleeder structure. In an alternative implementation, the drain structure includes a first transistor and a second transistor having the same channel type; A first pole of the first transistor is connected with a first voltage input end, and a second pole of the first transistor and a grid electrode of the first transistor are respectively connected with the first node; The first electrode of the second transistor is connected with the first node, and the second electrode of the second transistor and the grid electrode of the second transistor are respectively connected with the second voltage input end. In an alternative implementation, the first driving circuit includes: a first electrode of the first capacitor is connected with the first power supply end, and a second electrode of the first capacitor is connected with the grid electrode of the first driving transistor; The first reset module is used for transmitting a signal of a first initialization voltage end to the grid electrode of the first driving transistor and the second pole of the first capacitor in a first reset stage; The first writing module is used for writing the data signal of the first data writing end into the source electrode of the first driving transistor in a first writing stage; the first compensation module is used for conducting the drain electrode of the first driving transistor and the grid electrode of the first driving transistor in a first writing stage; The first light emitting control module is used for disconnecting the source electrode of the first driving transistor from the first power supply end, disconnecting the drain electrode of the first driving transistor from the first electrode of the first light emitting device in a first reset stage and a first writing stage, conducting the source electrode of the first driving transistor from the first power supply end and conducting the drain electrode of the first driving transistor from the f