Detection circuit and detection method of display panel, display panel

Abstract

The application discloses a display panel, a detection method and a display device. The display panel has a displayable area and a non-displayable area. Pixels are arranged in the displayable area of the display panel. A detection circuit is arranged in the non-displayable area of the display panel. The detection circuit comprises a virtual pixel unit, which is arranged in the same film layer as the pixels. A multiplexing circuit is connected to the virtual pixel unit and is used to connect an external detection device, receive a detection signal sent by the detection device, send the detection signal to the virtual pixel unit, drive the virtual pixel unit to emit light, send a feedback signal to the detection device according to the light emitting state of the virtual pixel unit, and enable the detection device to detect the pixels based on the feedback signal. The display panel can effectively avoid damaging the displayable area of the display panel to be detected, and can also reduce the frequency of extracting experimental display panels from a production line, thereby effectively improving the production efficiency of the display panel.

Description

Technical Field

[0001] This application relates to the field of display panel technology, and in particular to a detection circuit and detection method for a display panel, and a display panel itself. Background Technology

[0002] Currently, in the manufacturing process of display panels, the occurrence rate of defects such as dots, lines, and Mura (brightness unevenness) in the array substrates of the display panels is relatively high. In order to effectively reduce the occurrence rate of performance defects, before a large number of array substrates are put into the production line, it is usually necessary to apply for multiple array substrate test pieces to conduct various performance debugging and verification.

[0003] However, current debugging and verification of array substrates are usually performed on the portion of the array substrate corresponding to the displayable area of ​​the display panel. This inevitably damages the experimental wafers, forcing them to be scrapped and resulting in significant waste. Furthermore, the process of requesting and retrieving experimental wafers is usually lengthy, and high-frequency extraction of experimental wafers will also greatly impact the production efficiency of the display panel. Summary of the Invention

[0004] The main technical problem addressed by this application is to provide a display panel and a testing method and display device that can solve the problem in the prior art where the debugging and verification of the array substrate in the display panel inevitably damages the test piece and affects the production efficiency of the display panel.

[0005] To solve the above-mentioned technical problems, one technical solution adopted in this application is: providing a display panel having a displayable area and a non-displayable area, with pixels provided in the displayable area and a detection circuit provided in the non-displayable area. The detection circuit includes: a virtual pixel unit located on the same film layer as the pixel; and a multiplexing circuit connected to the virtual pixel unit and used to connect to an external detection device to receive detection signals sent by the detection device and send the detection signals to the virtual pixel unit to drive the virtual pixel unit to emit light, and send a feedback signal to the detection device according to the emission state of the virtual pixel unit, so that the detection device can detect the pixel based on the feedback signal.

[0006] The virtual pixel unit includes multiple sub-pixels arranged in an array. The light emission state of the virtual pixel unit includes multiple sub-pixels emitting light, multiple sub-pixels not emitting light, some sub-pixels emitting light, and the position information of the partially emitting sub-pixels.

[0007] The multiplexing circuit includes multiplexing connection lines, detection input signal lines, and switch control lines. The multiplexing connection lines are connected to the virtual pixel units, the detection input signal lines are connected to the switch control lines and the virtual pixel units, and the switch control lines are connected to the virtual pixel units.

[0008] The multiplexing circuit also includes a first switch sub-circuit and a second switch sub-circuit. The first switch sub-circuit connects the multiplexing connection line to the virtual pixel unit, and the second switch sub-circuit connects the detection input signal line to the switch control line and connects to the virtual pixel unit.

[0009] The multiplexing circuit also includes a connection pad, which is connected to the first switch sub-circuit and used to connect to the testing equipment.

[0010] The number of virtual pixel units is at least two, and the number of multiplexing circuits is at least two, the same as the number of virtual pixel units. Each multiplexing circuit is connected to one virtual pixel unit and connected to other multiplexing circuits.

[0011] The multiplexing connection line includes the first to fourth multiplexing connection lines, the detection input signal line includes the first to third detection input signal lines, and the switch control line includes the first to third switch control lines. The first to fourth multiplexing connection lines, the first to third detection input signal lines, and the first to third switch control lines all extend in the same direction.

[0012] The display panel also includes data lines and scan lines in the displayable area. The detection input signal line and the data line are located on the same film layer, and the switch control line and the scan line are located on the same film layer.

[0013] To solve the above-mentioned technical problems, another technical solution adopted in this application is: to provide a detection method for a display panel, the detection method for the display panel including: receiving a detection signal sent by an external detection device; sending the detection signal to a virtual pixel unit to drive the virtual pixel unit to emit light; and sending a feedback signal to the detection device according to the emission state of the virtual pixel unit, so that the detection device detects the pixel based on the feedback signal.

[0014] To solve the above-mentioned technical problems, another technical solution adopted in this application is to provide a display device, which includes the display panel described in any of the above claims.

[0015] The beneficial effects of this application are as follows: Unlike the prior art, the display panel provided in this application has a displayable area and a non-displayable area. Pixels are provided in the displayable area of ​​the display panel, while the detection circuit is located in the non-displayable area. The virtual pixel unit of the detection circuit is located on the same film layer as the pixel in the display panel. A multiplexed circuit is connected to the virtual pixel unit and used to connect to an external detection device to receive the detection signal sent by the detection device and send the detection signal to the virtual pixel unit to drive the virtual pixel unit to emit light. The feedback signal corresponding to the light emission state of the virtual pixel unit is sent to the detection device so that the detection device can detect the pixel based on the feedback signal. This allows the detection of pixels in the display panel to be completed in the non-displayable area of ​​the display panel, effectively avoiding damage to the displayable area of ​​the display panel being tested, and characterizing potential defects such as dots, lines, and Mura on the array substrate of the display panel in advance. Furthermore, it can reduce the frequency of extracting display panel test pieces from the production line, shorten the time to launch new display panel products, and thus effectively improve the production efficiency of display panels. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of one embodiment of the detection circuit of this application;

[0017] Figure 2 yes Figure 1 A detailed structural diagram of the detection circuit;

[0018] Figure 3 This is a flowchart illustrating one embodiment of the detection method for the display panel of this application. Detailed Implementation

[0019] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0020] The terms "first," "second," and "third" in this application are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first," "second," or "third" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified. All directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationships and movements between components in a specific orientation (as shown in the figures). If the specific orientation changes, the directional indications also change accordingly. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to these processes, methods, products, or devices.

[0021] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0022] The present application will now be described in detail with reference to the accompanying drawings and embodiments.

[0023] Please see Figure 1 and Figure 2 ,in, Figure 1 This is a schematic diagram of one embodiment of the detection circuit of this application. Figure 2 yes Figure 1 A detailed structural diagram of the detection circuit is shown below. In this embodiment, the detection circuit 10 includes: a virtual pixel unit 11 and a multiplexing circuit 12.

[0024] Understandably, the detection circuit 10 is specifically used in the product inspection during the manufacturing process of the display panel 100. The detection circuit 10 connects external inspection equipment to the functional unit of the display panel 100 intended for inspection, and inspects the display panel 100, such as the array substrate in the display panel 100, to determine whether it has any reasonable defects such as dots, lines, or Mura-type defects.

[0025] The display panel 100 has a displayable area 101 and a non-display area 102. Pixels (not shown) are provided in the displayable area 101 of the display panel 100 to enable corresponding image display. Specifically, these pixels correspond to the structural parts of the display panel 100 that require functional testing.

[0026] The detection circuit 10 is correspondingly disposed in the non-display area 102 of the display panel 100, specifically in the simulation area 1021 within the non-display area 102. The simulation area 1021 is specifically located at any reasonable gap within the non-display area 102 where no functional circuits are present, to avoid affecting the normal operation of the displayable area 101 and other functional circuits within the non-display area 102 of the display panel 100. Furthermore, after completing the detection of the display panel 100, at least some of the circuitry and / or components of the detection circuit 10 formed within the simulation area 1021 can be removed to avoid affecting the subsequent normal display of the display panel 100.

[0027] Specifically, the virtual pixel unit 11 of the detection circuit 10 is located on the same film layer as the pixel in the displayable area 101 of the display panel 100, and can be manufactured by the same process. This allows the detection of the display performance of the virtual pixel unit 11 to determine whether there are any defective pixels in the displayable area 101 of the display panel 100.

[0028] Furthermore, the multiplexing circuit 12 of the detection circuit 10 is connected to the virtual pixel unit 11 and used for external detection equipment. That is, when the external detection equipment needs to detect the display panel 100, it is specifically connected to the virtual pixel unit 11 through the multiplexing circuit 12 to send different detection signals to the multiplexing circuit 12 according to different debugging and verification tasks.

[0029] When the multiplexing circuit 12 receives a detection signal from the detection device, it sends the detection signal to the virtual pixel unit 11 to drive the virtual pixel unit 11 to emit light and obtain the light emission state of the virtual pixel unit 11. Then, it can send a corresponding feedback signal to the detection device according to the light emission state of the virtual pixel unit 11, so that the detection device processes the feedback signal based on a preset detection program to determine whether there are any defects in the pixels in the displayable area 101 of the display panel 100. For example, if the detection signal cannot light up the virtual pixel unit 11, or if the light emission of the virtual pixel unit 11 is uneven, then it is determined that the pixels in the displayable area 101 of the display panel 100 also have corresponding defects. When it is determined that the display of the virtual pixel unit 11 is good, then it is determined that the pixel performance in the displayable area 101 of the display panel 100 is good.

[0030] The above solution, by performing pixel detection in the non-display area 102 of the display panel 100, effectively avoids damage to the displayable area 101 of the display panel 100 being inspected, and characterizes potential defects such as dots, lines, and mura on the array substrate of the display panel 100 in advance, thereby effectively increasing the utilization rate of the non-display area 102 of the display panel 100. Furthermore, it reduces the frequency and duration of extracting or manufacturing experimental display panel 100 wafers from the production line, thus shortening the product launch cycle of the display panel 100 and effectively improving the production efficiency of the display panel 100.

[0031] In one embodiment, the virtual pixel unit 11 specifically includes a plurality of sub-pixels arranged in an array, and the plurality of sub-pixels may adopt the same arrangement as the pixels in the displayable area 101 of the display panel 100. Furthermore, when the detection device drives the virtual pixel unit 11 through the multiplexing circuit 12, the light emission state of the virtual pixel unit 11 may specifically include any reasonable operating state such as all sub-pixels emitting light, all sub-pixels not emitting light, some sub-pixels emitting light, and the light emission brightness of each sub-pixel.

[0032] Each light emission state corresponds to a different feedback signal. When the multiplexing circuit 12 sends the corresponding feedback signal to the detection device, the detection device can determine the light emission state of the virtual pixel unit 11 according to its preset detection program, and then determine whether there are defects in the pixels in the display area 101 of the display panel 100, and what type of defects exist.

[0033] Furthermore, when the light-emitting state of the virtual pixel unit 11 specifically corresponds to the light-emitting of some sub-pixels among multiple sub-pixels, the feedback signal sent by the multiplexing circuit 12 to the detection device may specifically include the position information of some light-emitting sub-pixels or the position information of some non-light-emitting sub-pixels, so that the detection device can calculate the position information of the light-emitting sub-pixels or the position information of the non-light-emitting sub-pixels according to a preset detection program, such as setting a calculation function, thereby determining which part of the pixels in the displayable area 101 of the display panel 100 has defects or is faulty.

[0034] In one embodiment, the multiplexing circuit 12 further includes a multiplexing connection line 121, a detection input signal line 122, and a switch control line 123. The multiplexing connection line 121 is specifically connected to the virtual pixel unit 11 and is used to connect to an external detection device. The detection input signal line 122 is connected to the switch control line 123 and the virtual pixel unit 11, and the switch control line 123 is also connected to the virtual pixel unit 11.

[0035] The detection input signal line 122 is also connected to the detection device so that it can receive different detection signals synchronously with the multiplexed connection line 121, so as to drive the virtual pixel unit 11 to emit light through the detection signal, and then perform performance detection on the pixels in the displayable area 101 of the display panel 100.

[0036] Furthermore, in one embodiment, the multiplexing circuit 12 further includes a first switch sub-circuit 124 and a second switch sub-circuit 125. The first switch sub-circuit 124 connects the multiplexing connection line 121 to the virtual pixel unit 11, that is, the multiplexing connection line 121 is specifically connected to the virtual pixel unit 11 through the first switch sub-circuit 124. The second switch sub-circuit 125 connects the detection input signal line 122 to the switch control line 123 and is connected to the virtual pixel unit 11.

[0037] Understandably, after the detection device is connected to the multiplexed connection line 121, it can control the conduction state of the first switch sub-circuit 124 and the second switch sub-circuit 125 by sending corresponding detection signals to the multiplexed connection line 121. This, in turn, controls the conduction state of the multiplexed connection line 121, the detection input signal line 122, and the switch control line 123 connected to the virtual pixel unit 11, and sends signals to the virtual pixel unit 11 to drive the virtual pixel unit 11 to emit light. Thus, the pixels of the displayable area 101 of the display panel 100 can be detected according to the light emission state of the virtual pixel unit 11.

[0038] In one embodiment, the multiplexing circuit 12 further includes a connection pad 126. The multiplexing circuit 12 is specifically connected to the first switch sub-circuit 124 through the connection pad 126 and is connected to an external detection device. That is, the detection device is specifically connected to the multiplexing circuit 12 by connecting the corresponding pins to the connection pad 126, so as to detect the virtual pixel unit 11 and the pixels in the displayable area 101 of the corresponding display panel 100 through the multiplexing circuit 12.

[0039] In one embodiment, the number of virtual pixel units 11 is at least two, and the number of multiplexing circuits 12 is at least two, the same as the number of virtual pixel units 11. The at least two multiplexing circuits 12 are interconnected, and each multiplexing circuit 12 is connected to one virtual pixel unit 11 to independently detect each virtual pixel unit 11. This increases the accuracy of pixel detection by increasing the number of experimental samples and reduces the frequency of sampling experimental pieces from the production line.

[0040] Optionally, the number of multiplexing circuits 12 shall not exceed 10, but may be any reasonable number such as 1, 2 or 4, and this application does not limit this.

[0041] In one embodiment, the multiplexing connection line 121 specifically includes first to fourth multiplexing connection lines MUX1-MUX4, the detection input signal line 122 includes first to third detection input signal lines D1-D3, and the switch control line 123 includes first to third switch control lines SW1-SW3. Furthermore, the first to fourth multiplexing connection lines MUX1-MUX4, the first to third detection input signal lines D1-D3, and the first to third switch control lines SW1-SW3 all extend in the same direction.

[0042] It is understood that the detection circuit 10 is specifically set in the simulation area 1021 within the non-display area 102 of the display panel 100, and the simulation area 1021 specifically corresponds to any reasonable gap in the non-display area 102 where no functional circuit is set. In order to make reasonable use of each idle gap position, the first to fourth multiplexing connection lines MUX1-MUX4, the first to third detection input signal lines D1-D3, and the first to third linkage control lines SW1-SW3 in the multiplexing circuit 12 are specifically arranged in any reasonable extension direction according to the actual external dimensions of each gap position, so as to minimize the area occupied by the multiplexing circuit 12 in the non-display area 102.

[0043] For ease of explanation, such as Figure 2As shown, each virtual pixel unit 11 specifically includes first to eighth sub-pixels P1-P8 arranged in an array, and each multiplexed circuit 12 includes a first to fourth switch sub-circuit 124 including first to fourth switch transistors T1-T4, a second switch sub-circuit 125 including fifth to eleventh switch transistors T5-T11, first to fourth multiplexed connection lines MUX1-MUX4, first to third detection input signal lines D1-D3, first to third switch control lines SW1-SW3, and a connection pad 126 (i.e., a connection pad PAD). Taking this as an example, it can be seen that the connection pad PAD connects to the first to fourth switches. The first ends of transistors T1-T4 and the second ends of the first to fourth switching transistors T1-T4 are sequentially connected to the first multiplexed connection line MUX1, the second multiplexed connection line MUX2, the third multiplexed connection line MUX3, and the fourth multiplexed connection line MUX4, respectively. The third end of the first switching transistor T1 is connected to the first end of the fifth switching transistor T5, the first end of the sixth switching transistor T6, the first sub-pixel P1, and the fifth sub-pixel P5. The second end of the fifth switching transistor T5 is connected to the first switch control line SW1 and the third end of the fifth switching transistor T5 is connected to the first detection input signal line D1. The second end of the sixth switching transistor T6 is connected to the second switch control line SW2. The third terminal of switch T6 is connected to the third detection input signal line D3; the third terminal of the second switch T2 is connected to the first terminal of the seventh switch T7, the second sub-pixel P2, and the sixth sub-pixel P6; the second terminal of the seventh switch T7 is connected to the third switch control line SW3; the third terminal of the seventh switch T7 is connected to the second detection input signal line D2; the third terminal of the third switch T3 is connected to the first terminal of the eighth switch T8, the first terminal of the ninth switch T9, the third sub-pixel P3, and the seventh sub-pixel P7; the second terminal of the eighth switch T8 is connected to the second switch control line SW2; the third terminal of the eighth switch T8 is connected to the third detection input signal line D3. D3, the second end of the ninth switch T9 is connected to the first switch control line SW1, and the third end of the ninth switch T9 is connected to the first detection input signal line D1; the third end of the fourth switch T4 is connected to the first end of the tenth switch T10, the first end of the eleventh switch T11, the fourth sub-pixel P4, and the eighth sub-pixel P8; the second end of the tenth switch T10 is connected to the first switch control line SW1, and the third end of the tenth switch T10 is connected to the first detection input signal line D1; the second end of the eleventh switch T11 is connected to the second switch control line SW2, and the third end of the eleventh switch T11 is connected to the third detection input signal line D3.

[0044] Understandably, the external testing equipment is connected to the first to eleventh switching transistors T1-T11, the first to fourth multiplexed connection lines MUX1-MUX4, the first to third detection input signal lines D1-D3, and the first to third switch control lines SW1-SW3 via the connection pads PAD. This allows it to control the changes in the various detection signals sent by the testing equipment via the first to fourth multiplexed connection lines MUX1-MUX4 and the first to third switch control lines SW1-SW3, thereby driving the virtual pixel unit 11 to emit light. By acquiring the light emission state of the first to eighth sub-pixels P1-P8, it can determine whether there are dot, line, or Mura-type defects in the pixels of the displayable area 101 of the display panel 100.

[0045] In one embodiment, when the number of virtual pixel units 11 is at least two and the number of multiplexed connection lines 12 is also at least two, the first to fourth multiplexed connection lines MUX1-MUX4 in different multiplexed connection lines 12 are specifically connected in series with each other, and specifically correspond to the same connection line; the first to third detection input signal lines D1-D3 in different sub-multiplexing circuits 121 are also connected in series with each other, and specifically correspond to the same connection line; the first to third switch control lines SW1-SW3 in different multiplexed connection lines 12 are also connected in series with each other, and specifically correspond to the same connection line; however, the first to eleventh switch transistors T11 in different multiplexed connection lines 12 are connected to the pads PAD independently, and the corresponding connection methods are described in the following reference. Figure 2 I will not go into details here.

[0046] In one embodiment, the displayable area of ​​the display panel also includes data lines and scan lines, and the detection input signal line in the multiplexing circuit is specifically located on the same film layer as the data line, so as to be manufactured by the same process as the data line, and the switch control line in the multiplexing circuit is specifically located on the same film layer as the scan line.

[0047] This application also provides a method for detecting a display panel; please refer to [link to relevant documentation]. Figure 3 , Figure 3 This is a flowchart illustrating one embodiment of the detection method for the display panel of this application. Specifically, it may include the following steps:

[0048] S21: Receive detection signals sent by external detection equipment.

[0049] Understandably, the detection method is specifically a method for a detection circuit to detect a display panel, which has a displayable area and a non-displayable area. Pixels are provided in the displayable area of ​​the display panel, while the detection circuit is located in the non-displayable area of ​​the display panel. The detection circuit further includes: a virtual pixel unit and a multiplexing circuit, and the virtual pixel unit is specifically located in the same film layer as the pixel.

[0050] The multiplexing circuit is used to connect to external testing equipment to receive the corresponding testing signals sent by the external testing equipment.

[0051] S22: Send the detection signal to the virtual pixel unit to drive the virtual pixel unit to emit light.

[0052] Furthermore, the multiplexing circuit sends the received detection signal to the virtual pixel unit to drive the virtual pixel unit to emit light.

[0053] S23: Send a feedback signal to the detection device based on the light emission state of the virtual pixel unit, so that the detection device can detect the pixel based on the feedback signal.

[0054] Understandably, when the multiplexing circuit drives the virtual pixel unit to emit light and obtains the emission state of the virtual pixel unit, it can send a corresponding feedback signal to the detection device based on the emission state of the virtual pixel unit. This allows the detection device to process the feedback signal based on a preset detection program to determine whether there are any defects in the pixels in the displayable area of ​​the display panel. For example, if the detection signal cannot light up the virtual pixel unit, or if the emission of the virtual pixel unit is uneven, then it is determined that there are corresponding defects in the pixels in the displayable area of ​​the display panel. Conversely, if it is determined that the display of the virtual pixel unit is good, then it is determined that the pixel performance in the displayable area of ​​the display panel is good.

[0055] This application also provides a display device. In this embodiment, the display device includes a display panel with the detection circuit of any of the above embodiments.

[0056] The beneficial effects of this application are as follows: Unlike existing technologies, the display panel provided in this application has a displayable area and a non-displayable area. Pixels are provided in the displayable area of ​​the display panel, while a detection circuit is located in the non-displayable area. The virtual pixel units of this detection circuit are specifically identical to at least some of the pixels. A multiplexed circuit connects the virtual pixel units to an external detection device, enabling it to receive detection signals sent by the detection device and send these signals to the virtual pixel units to drive them to emit light. Based on the light emission state of the virtual pixel units, the pixels are detected. This allows for pixel detection within the non-displayable area of ​​the display panel, effectively avoiding damage to the displayable area and characterizing potential defects such as dots, lines, and murras in the array substrate of the display panel in advance. Furthermore, it reduces the frequency of extracting experimental display panel wafers from the production line, shortens the time to market for new display panel products, and effectively improves the production efficiency of display panels.

[0057] The above description is merely an embodiment of this application and does not limit the patent scope of this application. Any equivalent structural or procedural transformations made using the content of this application's specification and drawings, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of this application.

Claims

1. A display panel having a displayable area and a non-displayable area, pixels are arranged in the displayable area of the display panel, and a detection circuit is arranged in the non-displayable area of the display panel, the detection circuit comprises a virtual pixel unit and a multiplexing circuit, the virtual pixel unit and the multiplexing circuit are located on the same side of the display panel and in an emulation area in the non-displayable area, the emulation area is any reasonable gap in the non-displayable area where no functional circuit is arranged, and after the detection circuit formed in the emulation area completes the detection of the display panel, at least part of the lines and / or elements can be removed; wherein the virtual pixel unit and the pixels are located in the same film layer, and the virtual pixel unit comprises a plurality of sub-pixels arranged in an array; a multiplexing circuit connected to the virtual pixel unit and used to connect an external detection device to receive a detection signal sent by the detection device and send the detection signal to the virtual pixel unit to drive the virtual pixel unit to emit light, and send a feedback signal to the detection device according to the light emitting state of the virtual pixel unit, so that the detection device detects the pixels based on the feedback signal; wherein the number of the multiplexing circuits is not more than 10 and greater than 2, the multiplexing circuit comprises a multiplexing connection line and a detection input signal line, the multiplexing connection line comprises first to fourth multiplexing connection lines, the detection input signal line comprises first to third detection input signal lines, the number of the sub-pixels electrically connected by any one of the first to fourth multiplexing connection lines is 2, one of the first to fourth multiplexing connection lines is electrically connected to the sub-pixels of different light emitting colors, and is electrically connected to two of the first to third detection input signal lines, one of the first to fourth multiplexing connection lines is electrically connected to the sub-pixels of the same light emitting color, and is electrically connected to one of the first to third detection input signal lines. The light emitting state of the virtual pixel unit comprises that all the sub-pixels emit light, all the sub-pixels do not emit light, and part of the sub-pixels emit light.

2. The display panel of claim 1, wherein, The multiplexing circuit comprises a switch control line, the multiplexing connection line is connected to the virtual pixel unit and used to connect the detection device, the detection input signal line is connected to the switch control line and the virtual pixel unit, and the switch control line is connected to the virtual pixel unit.

3. The display panel of claim 1, wherein, The multiplexing circuit further comprises a first switch sub-circuit and a second switch sub-circuit, the first switch sub-circuit connects the multiplexing connection line with the virtual pixel unit, and the second switch sub-circuit connects the detection input signal line with the switch control line and is connected to the virtual pixel unit.

4. The display panel of claim 3, wherein, The multiplexing circuit further comprises a connection pad connected to the first switch sub-circuit and used to connect the detection device.

5. The display panel of claim 4, wherein, ​ 6. The display panel of claim 5, wherein, The multiplexing circuits are the same number as the virtual pixel units, each of the multiplexing circuits is connected to one of the virtual pixel units, and is connected to other multiplexing circuits.

7. The display panel of claim 6, wherein, The switch control lines include first to third switch control lines, and the first to fourth multiplexing connection lines, the first to third detection input signal lines and the first to third switch control lines all extend in the same direction.

8. The display panel of any of claims 3-7, wherein, The display panel further includes data lines and scan lines in the displayable area, the detection input signal lines are located in the same film layer as the data lines, and the switch control lines are located in the same film layer as the scan lines.

9. A method for detecting a display panel, characterized in that, The method is applied to the display panel in any one of claims 1-8, and the detection method of the display panel includes: receiving a detection signal sent by an external detection device; sending the detection signal to the virtual pixel unit to drive the virtual pixel unit to emit light; sending a feedback signal to the detection device according to the light emitting state of the virtual pixel unit, so that the detection device detects the pixel based on the feedback signal.

10. A display device, characterized by comprising: The display device includes the display panel in any one of claims 1-8.

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