WO2020119186A1

WO2020119186A1 - Display panel, pixel circuit and driving method therefor

Info

Publication number: WO2020119186A1
Application number: PCT/CN2019/103380
Authority: WO
Inventors: 范龙飞; 王龙彦; 朱晖; 韩珍珍; 胡思明; 吴剑龙; 张露
Original assignee: 昆山国显光电有限公司
Priority date: 2018-12-14
Filing date: 2019-08-29
Publication date: 2020-06-18
Also published as: CN109616051A

Abstract

A display panel, a pixel circuit (42) and a driving method therefor, the pixel circuit (42) comprising a driving chip (10), a plurality of pixel circuit units (20) and a plurality of detecting circuit units (30). Each detecting circuit unit (30) respectively independently corresponds to a group of pixel circuit units (20) which are arranged along a first direction; each pixel circuit unit (20) comprises at least a first switching transistor (T1) and an electroluminescent element (D); an access end of the first switching transistor (T1) is electrically connected to an anode of the electroluminescent element (D), and a control end of the first switching transistor (T1) is connected to a scan signal (scan) end; each detecting circuit unit (30) comprises at least a selection circuit (31); the selection circuit (31) comprises at least a second switching transistor (T2); a first access end of the second switching transistor (T2) is connected to the anode of the electroluminescent element (D) therein by means of the corresponding pixel circuit unit (20); a control end of the second switching transistor (T2) is connected to a first timing signal end (S1(R), S1(G), S1(B)); and a second access end of the second switching transistor (T2) is connected to the driving chip (10). The described pixel circuit (42) may improve the display effect of the display panel and improve the service life of the display panel.

Description

Display panel, pixel circuit and driving method thereof

【Technical Field】

The present application relates to the field of display technology, in particular to a display panel, a pixel circuit and a driving method thereof.

【Background technique】

AMOLED (Active-matrix organic light-emitting diode) or active matrix organic light-emitting diode or active matrix organic light-emitting diode (OLED) display screens are widely used in mobile phones and TVs due to their advantages of wide viewing angle and low power consumption.

However, with the passage of time, the efficiency of OLED (organic light-emitting diode) will also decline rapidly, which will cause the brightness of the screen to gradually decrease, which will affect the display effect and life span of the display panel.

[Invention content]

In order to solve the above technical problems, a technical solution adopted by the present application is to provide a pixel circuit including a driving chip, and a plurality of pixel circuit units and a plurality of detection circuit units connected to the driving chip, wherein each A detection circuit unit independently corresponds to a group of pixel circuit units arranged along the first direction, and is selectively coupled to each pixel circuit unit in the group of pixel circuit units. The first direction is pixels arranged in an array The row direction or column direction of the circuit unit; wherein each pixel circuit unit includes at least a first switch tube and an electroluminescent element, a passage end of the first switch tube is electrically connected to the anode of the electroluminescent element, and the first switch tube The control terminal is connected to the scanning signal terminal; each detection circuit unit includes at least a selection circuit, and the selection circuit includes at least a second switch tube, and the first path end of the second switch tube is connected to the electroluminescent element of the corresponding pixel circuit unit through the corresponding The anode, the control end of the second switch tube is connected to the first timing signal terminal, and the second path end of the second switch tube is connected to the driver chip; wherein, when the second switch tube in the detection circuit unit is in a conducting state and coupled to it When the first switch tube in the pixel circuit unit is also in the conductive state, the driving chip detects the potential of the anode of the electroluminescent element in the pixel circuit unit corresponding to the first switch tube in the conductive state.

In order to solve the above technical problems, another technical solution adopted by the present application is to provide a driving method of the above pixel circuit. The driving method includes: detecting the potential of the anode of the electroluminescent element in each pixel circuit unit The potential of the anode of the electroluminescent element is collected in the driving chip to form an anode voltage compensation signal; wherein each pixel circuit unit includes at least a first switch tube and an electroluminescent element; each detection circuit unit includes at least a selection circuit and a selection circuit At least a second switching tube; the step of detecting the potential of the anode of the electroluminescent element in each pixel circuit unit includes: inputting a first timing signal to control the second switching tube in the detecting circuit unit to turn on, and inputting a scanning signal to control the corresponding The first switch tube in the pixel circuit unit is turned on, so that the driving chip and the anode of the electroluminescent element in the corresponding pixel circuit unit are turned on, thereby obtaining the potential of the anode of the electroluminescent element; the driving chip calls the anode voltage compensation signal and The anode voltage compensation signal is output to the corresponding pixel circuit unit.

To solve the above technical problems, another technical solution adopted by the present application is to provide a display panel including a substrate and a pixel circuit provided on the substrate. The pixel circuit is the above pixel circuit, including: a driving chip, and A plurality of pixel circuit units and a plurality of detection circuit units connected to the driving chip, wherein each detection circuit unit independently corresponds to a group of pixel circuit units arranged along the first direction, and a group of pixel circuit units Each pixel circuit unit is selectively coupled and connected, the first direction is the row direction or column direction of the pixel circuit units arranged in an array; wherein, each pixel circuit unit includes at least a first switch tube and an electroluminescent element, so A passage end of the first switch tube is electrically connected to the anode of the electroluminescent element, the control end of the first switch tube is connected to the scan signal terminal; each detection circuit unit includes at least a selection circuit, and the selection circuit includes at least a second Switch, the first path end of the second switch is connected to the anode of the electroluminescent element through the corresponding pixel circuit unit, the control end of the second switch is connected to the first timing signal end, the second path end of the second switch Connected to the driver chip; wherein, when the second switch tube in the detection circuit unit is in a conductive state and the first switch tube in the pixel circuit unit coupled thereto is also in a conductive state, the drive chip detects the conductive state The potential of the anode of the electroluminescent element in the pixel circuit unit corresponding to the first switch tube.

In this application, the pixel circuit includes a driving chip, a plurality of pixel circuit units connected to the driving chip, and a plurality of detection circuit units. The detection circuit unit is used to turn on the anode of the electroluminescent element in the driving chip and the corresponding pixel circuit unit . Therefore, it is convenient for the driving chip to obtain the anode potential of the electroluminescent element, which is convenient for the compensation of the anode potential in the subsequent display stage. The circuit can be better integrated with the pixel circuit unit, the circuit structure is simple, and the circuit structure is convenient for the detection stage and The display stage is designed independently of each other so that the detection stage does not affect the display stage.

【Explanation】

In order to more clearly explain the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without paying any creative work, other drawings can be obtained based on these drawings. among them:

1 is a schematic diagram of a circuit structure of a pixel circuit according to a first embodiment of this application;

2 is a schematic diagram of a circuit structure of a pixel circuit according to a second embodiment of this application;

3 is a schematic diagram of the principle of the structure of the double gate switch tube according to an embodiment of the present application;

4 is a schematic flowchart of a driving method of a pixel circuit according to an embodiment of the present application;

FIG. 5 is a specific flowchart of a display stage of a driving method of a pixel circuit according to an embodiment of the present application;

6 is a schematic structural diagram of a display panel according to an embodiment of the present application.

【detailed description】

The technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without making creative work fall within the protection scope of the present application.

Please refer to FIG. 1, which is a schematic diagram of a circuit structure of a pixel circuit according to a first embodiment of the present application.

In this embodiment, the pixel circuit includes a driving chip 10 and a plurality of pixel circuit units 20 and a plurality of detection circuit units 30 connected to the driving chip 10.

Each detection circuit unit 30 independently corresponds to a group of pixel circuit units 20 arranged along the first direction, and is selectively coupled to each pixel circuit unit 20 in the group of pixel circuit units 20. The first direction is The row direction or column direction of the pixel circuit units 20 arranged in an array.

For example, the first direction may be the column direction of the pixel circuit units arranged in an array. 1 is only a schematic diagram, which only illustrates the connection relationship between one pixel circuit unit 20 and the detection circuit unit 30 of a plurality of pixel circuit units 20 in a row. It is not difficult to understand that the other pixel circuit units 20 in the row are connected to the The connection relationship of the detection circuit unit 30 is the same, which is not shown one by one in the figure.

Each pixel circuit unit 20 includes at least a first switch tube T1 and an electroluminescent element D. A via terminal of the first switch tube T1 is electrically connected to the anode of the electroluminescent element D, and the control terminal of the first switch tube T1 is connected to the scan Signal (scan) end.

Each detection circuit unit 30 includes at least a selection circuit 31, and the selection circuit 31 includes at least a second switch T2, and the first path end of the second switch T2 is connected to it through a corresponding pixel circuit unit 20 (referring to the corresponding pixel circuit unit ) In the anode of the electroluminescent element D, the control terminal of the second switch tube T2 is connected to the first timing signal (S1) terminal, and the second path terminal (as a connection terminal) of the second switch tube T2 is connected to the driver chip 10. Wherein, the corresponding pixel circuit unit refers to a pixel circuit unit in a conducting state with the detection circuit unit 30.

When the second switch T2 in the detection circuit unit 30 is in the on state and the first switch T1 in the pixel circuit unit 20 coupled thereto is also in the on state, the driving chip 10 detects the first The potential of the anode of the electroluminescent element D in the pixel circuit unit 20 corresponding to a switch tube T1.

Optionally, the first switch tubes T1 in each pixel circuit unit 20 arranged in the second direction are connected to the same scan signal terminal, that is, share the same scan signal scan, the second direction is different from the first direction, which is an array The pixel circuit units 20 are arranged in a column direction or a row direction. For example, as shown in FIG. 1, the second direction is the row direction of the pixel circuit units 20 arranged in an array.

Optionally, each detection circuit unit 30 further includes a reset circuit 32, and the reset circuit 32 includes at least a third switch tube T3, and the first path end of the third switch tube T3 is connected to it through the corresponding pixel circuit unit 20 (referring to the Corresponding to the anode of the electroluminescent element D in the pixel circuit unit, the control terminal of the third switch tube T3 is connected to the second timing signal S2, and the second path terminal of the third switch tube T3 is connected to the reset signal (reset) terminal.

Please refer to FIG. 2, which is a schematic diagram of a circuit structure of a pixel circuit according to a second embodiment of the present application.

In this embodiment, each pixel circuit unit 20 further includes a storage capacitor C and a current control drive tube (T5) coupled to the anode of the electroluminescent element D, the storage capacitor C is selectively coupled to the drive chip 10, and It is selectively coupled to the control end of the current control drive tube (T5), and is used to receive and store the anode voltage compensation signal from the drive chip 10, and control the current control drive tube (T5) according to the anode voltage compensation signal.

The first path end of the third switch tube T3 in each detection circuit unit 30 is selectively coupled to the storage capacitor C for selectively resetting the storage capacitor C. By resetting the storage capacitor C, it is beneficial to improve the storage accuracy of the storage capacitor C to the anode voltage compensation signal.

Optionally, the pixel circuit unit 20 further includes a fourth switching tube T4, a fifth driving tube T5, a sixth switching tube T6, a seventh switching tube T7, an eighth switching tube T8, and a ninth switching tube T9, where the fifth The driving tube T5 is a current control driving tube.

The first path end of the fourth switch T4 is connected to the first working voltage VDD and the first end of the storage capacitor C, and the first end of the storage capacitor C is also connected to the first working voltage (VDD) end. The second path end is connected to the first path end of the fifth drive tube T5 and the second path end of the ninth switch tube T9, and the first path end of the fifth drive tube T5 is also connected to the second path end of the ninth switch tube T9 The control terminal of the fourth switch T4 is connected to the enable signal (EM) terminal.

The second path end of the fifth driving tube T5 is connected to the first path end of the sixth switching tube T6 and the second path end of the seventh switching tube T7, and the first path end of the sixth switching tube T6 is also connected to the seventh switching tube The second path end of T7; the control end of the fifth driving tube T5 is connected to the second end of the storage capacitor C.

The second path terminal of the sixth switch tube T6 is connected to the second path terminal of the first switch tube T1 and the anode of the electroluminescent element D, and the control terminal of the sixth switch tube T6 is connected to the enable signal (EM) terminal.

The first path terminal of the seventh switch tube T7 is connected to the control terminal of the fifth driving tube T5 and the second terminal of the storage capacitor, and the control terminal of the seventh switch tube T7 is connected to the third timing signal (S3) terminal.

The first path end of the eighth switch tube T8 is connected to the second end of the storage capacitor C, and the second path end of the eighth switch tube T8 is connected to the first path end of the first switch tube T1 and the first path of the second switch tube T2 And the first path end of the third switch T3, and the control end of the eighth switch T8 are connected to the fourth timing signal (S4) end.

The first path end of the ninth switch T9 is connected to the first path end of the fifth switch T5, the second path end of the ninth switch T9 is connected to the driver chip, and the first path end of the ninth switch T9 is also connected to the second The first path end of the switch T2 and the control end of the ninth switch T9 are connected to the third timing signal (S3) end.

The first terminal of the storage capacitor C is connected to the first operating voltage (VDD) terminal, the cathode of the electroluminescent element D is connected to the second operating voltage (VSS) terminal, and the first path terminal of the second switching tube T2 is connected to the first switching tube T1 And the second path end of the eighth switch tube T8, and the first path end of the third switch tube T3 connects the first path end of the first switch tube T1 and the second path end of the eighth switch tube T8.

Optionally, the first switch tubes T1 in each pixel circuit unit 20 arranged in the second direction share the same scan signal (scan) terminal; the first switch tubes in each pixel circuit unit 20 arranged in the first direction T1 is independently connected to corresponding scanning signals; during the detection phase and the display phase, each pixel circuit unit 20 in the pixel circuit is scanned progressively along the first direction.

Optionally, corresponding to each pixel circuit unit 20 arranged in the second direction, the third switch tube T3 in the detection circuit unit 30 shares the same second timing signal S2 and the same reset signal reset.

Optionally, corresponding to each pixel circuit unit 20 arranged in the second direction, the control end of the second switch tube T2 in the detection circuit unit 30 is accessed according to the light emission color of the electroluminescent element D in the corresponding pixel circuit unit 20 Different first timing signals S1(R), S1(G) or S1(B).

Optionally, corresponding to each pixel circuit unit 20 arranged in the second direction, the second path end of the second switch tube T2 in the detection circuit unit 30 is independently connected to different input and output pins Out(( 1), Out(2) or Out(3).

For example, as shown in FIG. 1, the first direction is the column direction and the second direction is the row direction. The first switching transistors T1 in each pixel circuit unit 20 in the same row share the same scan signal scan; each pixel circuit unit in the same column The first switch tubes T1 in 20 are independently connected to the corresponding scan signals, that is, they can not simultaneously receive the scan signals; during the detection phase and the display phase, each pixel circuit unit 20 in the pixel circuit is scanned row by row along the column direction. For each pixel circuit unit 20 in the same row, the third switch tube T3 in the detection circuit unit 30 shares the same second timing signal S2 and the same reset signal reset. For each pixel circuit unit 20 in the same row, the control terminal of the second switch tube T2 in the detection circuit unit 30 accesses different first timing signals S1(R according to the light emission color of the electroluminescent element D in the corresponding pixel circuit unit 20 ), S1(G) or S1(B); for each pixel circuit unit 20 in the same row, the second path end of the second switch tube T2 in the detection circuit unit 30 is independently connected to different input and output leads of the driving chip 10 Foot Out(1), Out(2) or Out(3).

Specifically, each pixel circuit unit 20 corresponds to a sub-pixel unit of the display panel. For example, the three sub-pixel units from left to right in FIG. 2 are a red sub-pixel unit (R) and a green sub-pixel unit (G) ), blue sub-pixel unit (B). The adjacent red, green, and blue sub-pixel units (RGB) form a pixel unit. By controlling the different gray levels of the sub-pixel unit, the red, green, and blue sub-pixel units (RGB) are mixed. Realize different display colors of the pixel unit.

The sub-pixel units of different colors located in the same row share one scan signal scan (that is, share the same scan line), share the same reset signal reset, and share the same second timing signal S2. The connection terminals of the sub-pixel units of different colors are connected to the different input and output pins Out(1), Out(2) or Out(3) of the driving chip 10 in a one-to-one correspondence. The control terminals of the second switch tubes T2 of the sub-pixel units of different colors are connected in a one-to-one correspondence with different first timing signals S1(R), S1(G) or S1(B).

Please refer to FIG. 3, which is a schematic diagram of the principle of the double-gate switch tube structure according to an embodiment of the present application. Optionally, the seventh switch tube T7 and the eighth switch tube T8 are both double-gate switch tubes. The double-gate switch tube structure includes a first sub-switch tube T01 and a second sub-switch tube T02, and the first sub-switch tube T01 and The gate of the second sub-switch tube T02 is connected together as the control end of the double-gate switch tube structure, the first path end of the first sub-switch tube T01 is used as the first path end of the double-gate switch tube structure, and the second sub-switch tube The second path end of T02 serves as the second path end of the double gate switch tube structure, and the second path end of the first sub switch tube T01 is connected to the first path end of the second sub switch tube T02.

In the above manner, the leakage current of the seventh switch tube T7 and the eighth switch tube T8 can be reduced, power consumption can be reduced, and the display effect of the electroluminescent element D can be improved. Of course, in other embodiments, the seventh switch tube T7 and the eighth switch tube T8 may also use single-gate MOS tubes, which is not limited in the embodiments of the present application.

Optionally, the first switching tube T1, the second switching tube T2, the third switching tube T3, the fourth switching tube T4, the fifth driving tube T5, the sixth switching tube T6, the seventh switching tube T7, the eighth switching tube Both T8 and the ninth switching tube T9 can be MOS tubes, which can be thin film transistors, and the first path terminal and the second path terminal are connected when the control terminal is connected to a low potential, and the first channel terminal is connected when the control terminal is connected to a high potential. One channel end and the second channel end are cut off. In other embodiments, the opposite configuration may be performed, for example, when the control terminal is connected to a low potential, the first path terminal and the second path terminal are cut off, and when the control terminal is connected to a high potential, the first path terminal and the second path terminal Turn on. For example, a P-type MOS tube is turned on when a low-potential signal is connected to the control terminal, and is turned off when a high-potential signal is connected; an N-type MOS tube is turned on when a high-potential signal is connected to the control terminal, and is turned off when it is connected to a low potential.

Optionally, the first switching tube T1, the second switching tube T2, the third switching tube T3, the fourth switching tube T4, the fifth driving tube T5, the sixth switching tube T6, the seventh switching tube T7, the eighth switching tube One of the first and second path ends of T8 and the ninth switch T9 is the source, the other is the drain, and the respective control ends are all gates.

Alternatively, the electroluminescent element may be an OLED light-emitting element, specifically an AMOLED (Active-matrix organic light-emitting diode, active matrix organic light-emitting diode or active matrix organic light-emitting diode). In other embodiments, other electroluminescent elements may also be used, which is not limited in the embodiments of the present application.

Please refer to FIG. 4, which is a schematic flowchart of an embodiment of a driving method of a pixel circuit according to an embodiment of the present application.

In this embodiment, the driving method of the pixel circuit may include:

Step S11: Detection stage: detect the potential of the anode of the electroluminescent element in each pixel circuit unit, and record the potential of the anode of the electroluminescent element in the driving chip to form an anode voltage compensation signal.

Each pixel circuit unit 20 includes at least a first switching tube T1 and an electroluminescent element D; each detection circuit unit 30 includes at least a selection circuit 31, and the selection circuit includes at least a second switching tube T2; each pixel is detected The step of the potential of the anode of the electroluminescent element D in the circuit unit 20 may specifically include: inputting the first timing signal S1 to control the conduction of the first and second path ends of the second switching tube T2 in the detection circuit unit 30, The input scan signal scan controls the conduction of the first and second path ends of the first switch tube T1, so that the driving chip 10 and the anode of the electroluminescent element D in the corresponding pixel circuit unit 20 are connected, and then electroluminescence is acquired The potential of the anode of element D.

Optionally, during the detection phase, the potential of the first timing signal S1 and the potential of the second timing signal S2 may not be required, which can cause the electroluminescent element D to emit light, but in order to reduce the detection stage for electroluminescence For the influence of the element D, it is recommended that the potential of the first timing signal S1 and the potential of the second timing signal S2 be as small as possible.

There is no limit to the first timing signal S1 in this application, as long as the first timing signal S1 used in each detection stage is kept the same, and the second timing signal S2 used in each detection stage is kept the same, by Each time the potential difference of the anode of the electroluminescent element D is detected, an anode voltage compensation signal is formed.

Step S12: Display stage: the driving chip calls the anode voltage compensation signal and outputs the anode voltage compensation signal to the corresponding pixel circuit unit.

Each detection circuit unit 30 in the present application further includes a reset circuit 32, and the reset circuit 32 includes at least a third switch tube T3; optionally, detects the potential of the anode of the electroluminescent element D in each pixel circuit unit 20 The step further includes: before acquiring the potential of the anode of the electroluminescent element D in the corresponding pixel circuit unit 20, initializing the potential of the anode of the electroluminescent element D in advance.

The step of initializing the potential of the anode of the electroluminescent element D includes: inputting a second timing signal S2 to control the conduction of the first and second path ends of the third switching tube T3, and inputting a scan signal scan to control the first The first path end and the second path end of the switch tube T1 are turned on, so that the reset signal (reset) end is connected to the anode of the electroluminescent element D in the corresponding pixel circuit unit 20, and then the anode of the electroluminescent element D To be initialized.

Optionally, in the process of detecting the potential of the anode of the electroluminescent element D (including the process of initializing the anode) in a group of pixel circuit units 20 corresponding to one detection circuit unit 30, a second timing signal is input S2 controls the first path end and the second path end of the third switch tube T3 to continue conducting, so that the electroluminescent element D continues to emit light, thereby reducing the influence of the detection stage on the electroluminescent element D.

Please refer to FIG. 5. FIG. 5 is a specific flowchart of a display stage of an embodiment of a driving method of a pixel circuit according to an embodiment of the present application. Each pixel circuit unit 20 further includes a storage capacitor C and a current control drive tube (T5) coupled to the anode of the electroluminescent element D.

Optionally, the display stage may specifically include:

Step S121: Perform a signal writing process on the storage capacitor C in each pixel circuit unit 20.

Wherein, the step of performing the signal writing process on the storage capacitor C in each pixel circuit unit 20 includes: controlling the second switch tube T2 in the detection circuit unit 30 to be in a conducting state, and controlling the second switch tube T2 and the corresponding pixel circuit The circuit between the storage capacitors C in the unit 20 is in a conducting state, so that the driving chip 10 is electrically connected to the storage capacitor C in the corresponding pixel circuit unit 20, and then the anode voltage compensation signal in the driving chip 10 is output to the corresponding pixel circuit In the storage capacitor C in the unit 20.

Optionally, the step of performing the signal writing process on the storage capacitor C in each pixel circuit unit 20 further includes (before signal writing) the step of initializing the storage capacitor C in the corresponding pixel circuit unit 20 in advance ; The steps of initializing the storage capacitor C in the corresponding pixel circuit unit 20 include: controlling the third switch tube T3 in the detection circuit unit 30 to be in a conducting state, and controlling the third switch tube T3 and the corresponding pixel circuit unit 20 The circuit between the storage capacitors C is in a conducting state, so that the reset signal (reset) terminal is connected to the storage capacitor C in the corresponding pixel circuit unit 20, and then the storage capacitor C is initialized.

Step S122: driving the electroluminescent element D in each pixel circuit unit 20 to emit light.

The step of driving the electroluminescent element D in each pixel circuit unit 20 to emit light includes: releasing the current in the storage capacitor C to control the current control driving tube (T5) in the conductive state with the storage capacitor C in the open state , So that the corresponding electroluminescent element D is in a light-emitting state.

Optionally, the step of driving the electroluminescent element D in each pixel circuit unit 20 to emit light further includes (before causing the electroluminescent element D to emit light) the pre-processing of the corresponding electroluminescent element D in the corresponding pixel circuit unit 20 The step of resetting the anode; the step of resetting the anode of the electroluminescent element D in the corresponding pixel circuit unit 20 includes: controlling the third switch tube T3 in the detection circuit unit 30 to be in a conducting state, and controlling the corresponding The first switch tube T1 in the pixel circuit unit 20 is in a conducting state, so that the reset signal (reset) terminal is connected to the anode of the electroluminescent element D in the corresponding pixel circuit unit 20, so that the corresponding electroluminescent element D The anode potential is reset.

Optionally, the current control drive tube uses a reset signal used in the detection phase different from the reset signal used in the display phase. Specifically, in the detection phase, the reset signal reset has a higher potential than the second operating voltage VSS, and the reset signal The voltage difference between reset and the second operating voltage VSS is greater than the turn-on voltage of the electroluminescent element D. In the display phase, the potential of the reset signal reset is less than or equal to the potential of the second operating voltage VSS. In the above manner, the electroluminescent element D can be made to emit light during the detection stage to reduce the influence of the detection process on the electroluminescent element D.

As shown in FIG. 2, each pixel circuit unit 20 further includes a fourth switching tube T4, a fifth driving tube T5, a sixth switching tube T6, a seventh switching tube T7, an eighth switching tube T8, and a ninth switching tube T9.

Specifically, in the step of performing the signal writing process on the storage capacitor C in each pixel circuit unit 20,

The steps of initializing the storage capacitor in the corresponding pixel circuit unit include: controlling the enable signal EM to control the first and second path ends of the fourth switching transistor T4 to be turned off, and controlling the sixth path of the sixth switching transistor T6 The first channel end and the second channel end are cut off; the scan signal scan is controlled to control the first path end and the second path end of the first switching tube T1 to be cut off; the third timing signal S3 is controlled to control the seventh switching tube T7 The first path end and the second path end are cut off, and the first path end and the second path end of the ninth switching tube T9 are controlled to be cut off; the second timing signal S2 is input to control the first path end and the third path of the third switching tube T3 The second path terminal is turned on, and a fourth timing signal S4 is input to control the first path terminal and the second path terminal of the eighth switch T8 to be turned on, so that the reset signal reset resets the storage capacitor C.

The step of outputting the anode voltage compensation signal in the driving chip 10 to the storage capacitor in the corresponding pixel circuit unit includes: controlling the enable signal EM to control the first and second path ends of the fourth switch T4 to be cut off, and control The first and second path ends of the sixth switching tube T6 are cut off; the scan signal scan is controlled to control the first and second path ends of the first switching tube T1 to be cut off; the fourth timing signal S4 is controlled to control The first path end and the second path end of the eighth switch tube T8 are cut off; the third timing signal S3 is input to control the conduction of the first path end and the second path end of the seventh switch tube T7, and the ninth switch tube is controlled The first path end and the second path end of T9 are turned on so that the driving chip 10 writes the anode voltage compensation signal into the storage capacitor C.

In the steps described above, the fifth driving tube T5 is also in a conducting state, because the storage capacitor C will retain a certain current after the initialization process is completed, and this part of the current will be input to the control terminal of the fifth driving tube to Control the conduction of the first and second path ends of the fifth driving tube T5. At this time, the ninth switching tube T9, the fifth driving tube T5, and the seventh switching tube T7 are all in the conducting state, and the driving chip 10 can turn the anode The voltage compensation signal is written into the storage capacitor C. At the same time, a part of the current output from the first path end of the seventh switching tube T7 will flow into the control end of the fifth driving tube T5 to control the first path end of the fifth driving tube T5 And the second path end are in a continuous conduction state.

Specifically, in the step of driving the electroluminescent element D in each pixel circuit unit 20 to emit light,

The step of resetting the anode of the electroluminescent element D in the corresponding pixel circuit unit 20 includes: controlling the enable signal EM to control the first and second path ends of the fourth switch T4 to be cut off, and controlling the first The first and second path ends of the six switching tubes T6 are turned off; the third timing signal S3 is controlled to control the first and second path ends of the seventh switching tube T7 to be turned off, and the ninth switching tube T9 is controlled The first path end and the second path end are turned off; the fourth timing signal S4 is controlled to control the first path end and the second path end of the eighth switching tube T8 to be turned off, and the scan signal scan is input to control the first switching tube T1 The first path end and the second path end are turned on; a second timing signal is input to control the first path end and the second path end of the third switch tube T3 so that the reset signal resets the anode potential of the electroluminescent element D Reset.

The step of making the corresponding electroluminescent element D in a light-emitting state includes: controlling the scan signal scan to control the first and second path ends of the first switching tube T1 to be cut off; controlling the third timing signal S3 to control the seventh switching tube The first path end and the second path end of T7 are cut off, and the first path end and the second path end of the ninth switch tube T9 are controlled to be cut off; the fourth timing signal S4 is controlled to control the first path of the eighth switch tube T8 End and the second path end are cut off; input enable signal EM to control the first path end and the second path end of the fourth switching transistor T4 to conduct, and control the first path end and the second path of the sixth switching transistor T6 The terminal is turned on, so that the electroluminescent element D emits light.

The driving method provided by the present application is a continuous process. Specifically, the scan signal scan is controlled to scan each pixel circuit unit 20 arranged along the first direction line by line (second direction), and to the same line (second Direction) each pixel circuit unit 20 performs storage capacitor C initialization, storage capacitor C signal writing, anode potential reset of the electroluminescent element D, and electroluminescent element D light emission at the same time; ) The pixel circuit unit 20 in order to initialize the storage capacitor C, write the storage capacitor C signal, reset the anode potential of the electroluminescent element D, and emit light from the electroluminescent element D; that is, the pixel circuit unit in the fourth column When the storage capacitor C in 20 is initialized, the storage capacitor C in the third column of the pixel circuit unit 20 where the storage capacitor C is initialized is signal-written, and the second column of the pixel circuit unit 20 in which the storage capacitor C signal is written is signal-written The anode potential of the electroluminescent element D in is reset, and the electroluminescent element D in the pixel circuit unit 20 of the first column that has completed the anode potential reset of the electroluminescent element D emits light.

Please refer to FIG. 6, which is a schematic structural diagram of a display panel according to an embodiment of the present application. In this embodiment, the display panel includes a substrate 41 and a pixel circuit 42 provided on the substrate 41. The pixel circuit 42 may be the pixel circuit in any of the above embodiments.

The substrate 41 may be a hard substrate or a flexible substrate, which is not limited in the embodiments of the present application.

The above are only examples of the present application, and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by the description and drawings of this application, or directly or indirectly used in other related technical fields, The same reason is included in the scope of patent protection of this application.

Claims

A pixel circuit includes a driving chip, and a plurality of pixel circuit units and a plurality of detection circuit units connected to the driving chip, wherein each of the detection circuit units is independently arranged along the first direction A group of the pixel circuit units, and is selectively coupled and connected to each of the pixel circuit units in the group of the pixel circuit units, and the first direction is the row direction or column of the pixel circuit units arranged in an array Direction; where,

Each of the pixel circuit units includes at least a first switch tube and an electroluminescent element, a passage end of the first switch tube is electrically connected to the anode of the electroluminescent element, and a control end of the first switch tube Connect the scanning signal terminal;

Each of the detection circuit units includes at least a selection circuit, and the selection circuit includes at least a second switch tube, and the first path end of the second switch tube is connected to the anode of the electroluminescent element therein through a corresponding pixel circuit unit, The control end of the second switch tube is connected to the first timing signal terminal, and the second path end of the second switch tube is connected to the driving chip;

Wherein, when the second switch tube in the detection circuit unit is in a conducting state and the first switch tube in the pixel circuit unit coupled thereto is also in a conducting state, the driving chip detects the conduction The potential of the anode of the electroluminescent element in the pixel circuit unit corresponding to the first switch tube in the state.
The pixel circuit according to claim 1, wherein the first switch in each of the pixel circuit units arranged along the second direction is connected to the same scanning signal terminal, and the second direction is different from the first direction, which It is the column direction or row direction of the pixel circuit units arranged in an array.
The pixel circuit according to claim 1, wherein

Each of the detection circuit units further includes a reset circuit, and the reset circuit includes at least a third switch tube, and a first path end of the third switch tube is connected to the electroluminescent element through the corresponding pixel circuit unit Of the anode, the control end of the third switch tube is connected to the second timing signal terminal, and the second path end of the third switch tube is connected to the reset signal terminal.
The pixel circuit according to claim 3, wherein

Each of the pixel circuit units further includes a storage capacitor and a current control drive tube coupled to the anode of the electroluminescent element, the storage capacitor is selectively coupled to the drive chip, and selectively connected to the current The control end of the control driving tube is coupled and connected for receiving and storing an anode voltage compensation signal from the driving chip, and controlling the current control driving tube according to the anode voltage compensation signal.
The pixel circuit according to claim 4, wherein the first path end of the third switching transistor in each detection circuit unit is coupled to the storage capacitor in the corresponding pixel circuit unit for The storage capacitor is selectively reset.
The pixel circuit according to claim 4, wherein each of the pixel circuit units further includes a fourth switching tube, a fifth driving tube, a sixth switching tube, a seventh switching tube, an eighth switching tube, and a ninth switching tube , Wherein the fifth drive tube is the current control drive tube;

The first path end of the fourth switch tube is connected to the first working voltage end, and the second path end of the fourth switch tube is connected to the first path end of the fifth drive tube and the second path of the ninth switch tube Terminal, the control terminal of the fourth switch tube is connected to an enable signal terminal;

The second path end of the fifth drive tube is connected to the first path end of the sixth switch tube and the second path terminal of the seventh switch tube, and the control end of the fifth drive tube is connected to the storage capacitor The second end of

The second path end of the sixth switch tube is connected to the second path end of the first switch tube and the anode of the electroluminescent element, and the control end of the sixth switch tube is connected to the enable signal terminal;

The first path end of the seventh switch tube is connected to the control end of the fifth drive tube, and the control end of the seventh switch tube is connected to the third timing signal terminal;

The first path end of the eighth switch tube is connected to the second end of the storage capacitor, and the second path end of the eighth switch tube is connected to the first path end of the second switch tube and the third switch tube A first path end, the control end of the eighth switch tube is connected to a fourth timing signal end;

The first path end of the ninth switch tube is connected to the first path end of the fifth switch tube, the second path end of the ninth switch tube is connected to the driving chip, and the control end of the ninth switch tube is connected to the Describe the third timing signal terminal;

The first end of the storage capacitor is connected to the first operating voltage, the cathode of the electroluminescent element is connected to a second operating voltage, and the first path end of the second switching tube is connected to the first A path end, the first path end of the third switch tube is connected to the first path end of the first switch tube.
The pixel circuit according to claim 6, wherein the seventh switch tube and the eighth switch tube are both double-gate switch tube structures, and the double-gate switch tube structure includes a first sub-switch tube and a second sub-switch tube A switching tube, the gates of the first sub-switching tube and the second sub-switching tube are connected together as a control end of the double-gate switching tube structure, and the first path end of the first sub-switching tube is used as a The first path end of the double gate switch tube structure, the second path end of the second sub switch tube serves as the second path end of the double gate switch tube structure, and the second path end of the first sub switch tube It is connected to the first path end of the second sub-switch tube.
A driving method of a pixel circuit, including:

Detecting the potential of the anode of the electroluminescent element in each pixel circuit unit, and recording the potential of the anode of the electroluminescent element in the driving chip to form an anode voltage compensation signal; wherein each of the pixel circuit units includes at least the first A switching tube and an electroluminescent element; each of the detection circuit units includes at least a selection circuit, and the selection circuit includes at least a second switching tube; detecting the anode of the electroluminescent element in each of the pixel circuit units The steps of the electric potential include: inputting a first timing signal to control the conduction of the second switch in the detection circuit unit, and inputting a scanning signal to control the conduction of the first switch in the corresponding pixel circuit unit, so that the driving chip is electrically connected to the corresponding pixel circuit unit The anode of the electroluminescent element is turned on, and then the potential of the anode of the electroluminescent element is obtained;

The driving chip calls the anode voltage compensation signal and outputs the anode voltage compensation signal to the corresponding pixel circuit unit.
The driving method according to claim 8, wherein each of the detection circuit units further includes a reset circuit, and the reset circuit includes at least a third switching transistor;

The step of detecting the potential of the anode of the electroluminescent element in each pixel circuit unit further includes: before acquiring the potential of the anode of the electroluminescent element in the corresponding pixel circuit unit, the anode of the electroluminescent element Initializing the potential;

Wherein, the step of initializing the potential of the anode of the electroluminescent element includes: inputting a second timing signal to control the conduction of the third switch tube, and inputting a scanning signal to control the conduction of the first switch tube, so that The reset signal terminal is connected to the anode of the electroluminescent element in the corresponding pixel circuit unit, thereby initializing the potential of the anode of the electroluminescent element.
The driving method according to claim 9, wherein

In the process of detecting the potential of the anode of the electroluminescent element in a group of pixel circuit units corresponding to one of the detection circuit units, a second timing signal is input to control the first path end and the third path of the third switch tube The second channel end continues to conduct.
The driving method according to claim 8, wherein each pixel circuit unit further includes a storage capacitor and a current control driving tube coupled to the anode of the electroluminescent element,

The driving method includes:

Performing a signal writing process on the storage capacitor in each pixel circuit unit; wherein the signal writing process on the storage capacitor in each pixel circuit unit includes: controlling the second switch tube in the detection circuit unit to be in a conducting state And control the circuit between the second switch tube and the storage capacitor in the corresponding pixel circuit unit to be in a conducting state, so that the driving chip is electrically connected to the storage capacitor in the corresponding pixel circuit unit, thereby driving the drive The anode voltage compensation signal in the chip is output to the storage capacitor in the corresponding pixel circuit unit; and

Driving the electroluminescent element in each pixel circuit unit to emit light; wherein the step of driving the electroluminescent element in each pixel circuit unit to emit light includes: releasing the current in the storage capacitor to control the conduction state with the storage capacitor The current control driving tube is in the on state, so that the corresponding electroluminescent element is in the light emitting state.
The driving method according to claim 11, wherein the step of performing the signal writing process on the storage capacitor in each pixel circuit unit further includes the step of initializing the storage capacitor in the corresponding pixel circuit unit in advance; The initializing process corresponding to the storage capacitor in the pixel circuit unit includes: controlling the third switch tube in the detection circuit unit to be in an on state, and controlling the third switch tube and the storage capacitor in the corresponding pixel circuit unit The circuit between is in a conducting state, so that the reset signal terminal and the storage capacitor in the corresponding pixel circuit unit are conductive, and then the storage capacitor is initialized;

The step of driving the electroluminescent element in each pixel circuit unit to emit light also includes the step of performing a reset process on the anode of the electroluminescent element in the corresponding pixel circuit unit in advance; The steps of the anode resetting process include: controlling the third switch tube in the detection circuit unit to be in a conductive state, and controlling the corresponding first pixel switch unit in the pixel circuit unit to be in a conductive state, so that the reset signal terminal and The anode of the electroluminescent element in the corresponding pixel circuit unit is turned on to reset the anode potential of the corresponding electroluminescent element. The current controls the driving tube.
The driving method according to claim 8, wherein each pixel circuit unit further includes a storage capacitor, a fifth driving tube, a fourth switching tube, a sixth switching tube, a third switching tube coupled to the anode of the electroluminescent element Seven switch tubes, eighth switch tubes and ninth switch tubes;

The driving method includes:

Performing signal writing processing on the storage capacitor in each pixel circuit unit; wherein the step of performing signal writing processing on the storage capacitor in each pixel circuit unit includes: controlling the fourth switch tube, the sixth switch tube, and all The first switching tube and the eighth switching tube are turned off; and the fifth driving tube, the seventh switching tube, and the ninth switching tube are controlled to be turned on, so that the driving chip turns the anode voltage on The compensation signal is written into the storage capacitor; and

Driving the electroluminescent element in each pixel circuit unit to emit light, wherein the step of driving the electroluminescent element in each pixel circuit unit to emit light includes: controlling the first switch tube, the seventh switch tube, the first The eight switching tubes and the ninth switching tube are turned off, and the fourth switching tube, the fifth driving tube, and the sixth switching tube are controlled to be turned on, so that the electroluminescent element emits light.
The driving method according to claim 13, wherein the step of performing the signal writing process on the storage capacitor in each pixel circuit unit further comprises:

The step of initializing the storage capacitor in the corresponding pixel circuit unit in advance: controlling the fourth switch tube, the sixth switch tube, the first switch tube, the seventh switch tube, and the ninth switch The tube is turned off; and the third switch tube and the eighth switch tube of the detection circuit unit are controlled to be turned on, so that the reset signal resets the storage capacitor;

The step of driving the electroluminescent element in each pixel circuit unit to emit light also includes:

The step of resetting the anode of the electroluminescent element in the corresponding pixel circuit unit in advance includes: controlling the fourth switch tube, the sixth switch tube, the seventh switch tube, the eighth switch tube, The ninth switch tube is turned off, and the first switch tube and the third switch tube of the detection circuit unit are controlled to be turned on, so that the reset signal resets the anode potential of the electroluminescent element.
The driving method according to claim 8, wherein the first switching transistors in each of the pixel circuit units arranged in the second direction share the same scan signal; in each of the pixel circuit units arranged in the first direction The first switching transistors are independently connected to corresponding scanning signals; during the detection phase and the display phase, each pixel circuit unit in the pixel circuit is scanned line by line along the first direction.
The driving method according to claim 8, wherein, corresponding to each of the pixel circuit units arranged in the second direction, the third switch tube in the detection circuit unit shares the same second timing signal and the same reset signal.
The driving method according to claim 8, wherein, corresponding to each pixel circuit unit arranged in the second direction, the control end of the second switch tube in the detection circuit unit is based on the electroluminescent element in the corresponding pixel circuit unit The luminous color is connected to different first timing signals.
A display panel includes a substrate and a pixel circuit provided on the substrate. The pixel circuit includes a driving chip, and a plurality of pixel circuit units and a plurality of detection circuit units connected to the driving chip. The detection circuit units independently correspond to a group of the pixel circuit units arranged along the first direction, and are selectively coupled to each of the pixel circuit units in the group of the pixel circuit units. The first The direction is the row direction or column direction of the pixel circuit units arranged in an array; wherein,

Each of the pixel circuit units includes at least a first switch tube and an electroluminescent element, a passage end of the first switch tube is electrically connected to the anode of the electroluminescent element, and a control end of the first switch tube Connect the scanning signal terminal;

Each of the detection circuit units includes at least a selection circuit, and the selection circuit includes at least a second switch tube, and the first path end of the second switch tube is connected to the anode of the electroluminescent element therein through a corresponding pixel circuit unit, The control end of the second switch tube is connected to the first timing signal terminal, and the second path end of the second switch tube is connected to the driving chip;

Wherein, when the second switch tube in the detection circuit unit is in a conducting state and the first switch tube in the pixel circuit unit coupled thereto is also in a conducting state, the driving chip detects conduction The potential of the anode of the electroluminescent element in the pixel circuit unit corresponding to the first switch tube in the state.
The pixel circuit according to claim 18, wherein the first switch in each of the pixel circuit units arranged along the second direction is connected to the same scanning signal terminal, and the second direction is different from the first direction, which It is the column direction or row direction of the pixel circuit units arranged in an array.
The pixel circuit according to claim 18, wherein

Each of the detection circuit units further includes a reset circuit, and the reset circuit includes at least a third switch tube, and a first path end of the third switch tube is connected to the electroluminescent element through the corresponding pixel circuit unit Of the anode, the control end of the third switch tube is connected to the second timing signal terminal, and the second path end of the third switch tube is connected to the reset signal terminal.