Testing methods and devices for display panels

Abstract

This application discloses a method and apparatus for detecting a display panel. The display panel includes an array substrate and a counter substrate disposed opposite to each other. The detection method is used to detect the conduction state of the common electrode of the array substrate and the common electrode of the counter substrate. The detection method includes: displaying an image on the display panel; maintaining the potential of the common electrode of the counter substrate and the common electrode of the array substrate at the same level; and determining the conduction state of the common electrode of the array substrate and the common electrode of the counter substrate based on the changes in the displayed image on the display panel. Through the above method, the conduction state of the common electrode of the array substrate and the common electrode of the counter substrate can be determined, thereby effectively detecting tone color deviation defects in the display panel. This solves the problems of difficulty in detecting tone color deviation defects and easy missed detection in the prior art, improving detection efficiency and accuracy.

Description

Technical Field

[0001] This application relates to the field of display technology, and in particular to a method and apparatus for testing display panels. Background Technology

[0002] Display panels typically consist of an array substrate and a counter substrate. Both the array substrate and the counter substrate include a common electrode. A conductive element located between the array substrate and the counter substrate is used to connect the common electrode of the array substrate and the common electrode of the counter substrate. During lamp-lit testing of the display panel, if the conductive element fails to connect the common electrode of the array substrate and the common electrode of the counter substrate, uneven grayscale transitions and poor tone and color shifts can easily occur.

[0003] However, in the existing technology, it is difficult to detect poor tonal color deviation in display panels, and it is easy to miss the detection. Summary of the Invention

[0004] This application provides a method and apparatus for testing display panels to solve the problem of difficulty in detecting tonal color deviation defects in display panels in the prior art.

[0005] To solve the above-mentioned technical problems, one technical solution adopted in this application is: providing a detection method for a display panel, the display panel including an array substrate and a counter substrate disposed opposite to each other, the detection method being used to detect the conduction state of the common electrode of the array substrate and the common electrode of the counter substrate; including:

[0006] To display an image on the display panel;

[0007] The potential of the common electrode of the substrate is kept consistent with that of the common electrode of the array substrate.

[0008] Based on the changes in the display screen, the conduction state of the common electrode of the array substrate and the common electrode of the counter substrate is determined.

[0009] Wherein, the step of aligning the potential of the common electrode of the substrate with that of the array substrate includes:

[0010] The common electrode of the substrate and the common electrode of the array substrate are connected to the same voltage source.

[0011] Wherein, the common electrode of the array substrate is grounded; the step of connecting the common electrode of the array substrate and the common electrode of the array substrate to the same voltage source includes:

[0012] The common electrode of the substrate is grounded.

[0013] The step of grounding the common electrode of the substrate includes:

[0014] Connect one end of the connecting wire to the end of the common electrode of the substrate located in the non-display area, and ground the other end of the connecting wire.

[0015] The step of determining the conduction state of the common electrode of the array substrate and the common electrode of the counter substrate based on changes in the display screen of the display panel includes:

[0016] In response to a change in the brightness of the display screen, it is determined that the common electrode of the array substrate and the common electrode of the opposing substrate are not connected.

[0017] The step of determining the conduction state of the common electrode of the array substrate and the common electrode of the counter substrate based on changes in the display screen of the display panel includes:

[0018] In response to partial flickering of the display screen on the display panel, it is determined that the common electrode of the array substrate is connected to the common electrode of the counter substrate.

[0019] To solve the above-mentioned technical problems, another technical solution adopted in this application is: providing a detection device for a display panel, the display panel including an array substrate and a counter substrate disposed opposite to each other, the detection device being used to detect the conduction state of the common electrode of the array substrate and the common electrode of the counter substrate; including:

[0020] An image acquisition component is used to acquire images of the display screen on the display panel;

[0021] A detection circuit is electrically connected to the image acquisition component; the detection circuit is used to receive the image of the display screen acquired by the image acquisition component, and to determine the conduction state of the common electrode of the array substrate and the common electrode of the counter substrate according to the changes in the display screen of the display panel.

[0022] The detection circuit is used to determine, in response to a change in the brightness of the display screen, that the common electrode of the array substrate and the common electrode of the counter substrate are not connected.

[0023] The detection circuit is used to determine, in response to partial flickering of the display screen of the display panel, whether the common electrode of the array substrate is connected to the common electrode of the counter substrate.

[0024] The detection circuit is also used to be electrically connected to the driving circuit of the display panel; and in response to receiving a detection signal, the detection circuit sends a light-up command for the display screen to the driving circuit.

[0025] The detection device for the display panel further includes a connecting wire for electrically connecting to the common electrode of the counter substrate; the connecting wire is also used to connect to the same voltage source as the common electrode of the array substrate so that the potential of the common electrode of the counter substrate and the common electrode of the array substrate are kept consistent.

[0026] The common electrode of the array substrate is grounded, and the detection circuit is electrically connected to the connecting wire to ground the connecting wire. The detection circuit is also used to detect the connection status between the connecting wire and the common electrode of the opposing substrate. In response to detecting that the connecting wire is electrically connected to the common electrode of the opposing substrate, the detection circuit sends an instruction to the image acquisition component to acquire an image of the display screen of the display panel.

[0027] The detection device for the display panel further includes a driving device and a clamping assembly connected to each other; the driving device is electrically connected to the detection circuit, and the clamping assembly is electrically connected to one end of the connecting wire; the image acquisition assembly is also used to acquire images of the display panel; and in response to the image acquisition assembly acquiring images of the display panel, the detection circuit sends a driving command to the driving device, and the driving device drives the clamping assembly to clamp the edge of the opposing substrate according to the driving command, so that the clamping assembly is electrically connected to the common electrode of the opposing substrate.

[0028] The beneficial effects of this application are as follows: Unlike existing technologies, this application discloses a method and apparatus for detecting a display panel. The display panel includes an array substrate and a counter substrate disposed opposite each other. The detection method is used to detect the conduction state of the common electrode of the array substrate and the common electrode of the counter substrate. The detection method includes: displaying an image on the display panel; maintaining the potential of the common electrode of the counter substrate and the common electrode of the array substrate at the same level; and determining the conduction state of the common electrode of the array substrate and the common electrode of the counter substrate based on changes in the displayed image. Through the above method, the conduction state of the common electrode of the array substrate and the common electrode of the counter substrate can be determined, thereby effectively detecting tone color deviation defects in the display panel. This solves the problems of difficulty in detecting tone color deviation defects and easy missed detection in existing technologies, improving detection efficiency and accuracy. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0030] Figure 1 This is a schematic flowchart of an embodiment of the display panel detection method provided in this application;

[0031] Figure 2 yes Figure 1 A flowchart illustrating step S3 in the provided method for detecting the display panel;

[0032] Figure 3 This is a schematic diagram of an embodiment of the display panel detection device provided in this application;

[0033] Figure 4 yes Figure 3 A schematic diagram of one embodiment of the provided display panel detection device;

[0034] Figure 5 yes Figure 3 A schematic diagram of another embodiment of the provided display panel detection device.

[0035] Icon labels:

[0036] Detection device 100; detection circuit 1; image acquisition component 2; connecting wire 3; driving device 4; clamping component 5. Detailed Implementation

[0037] 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.

[0038] The terms "first," "second," and "third" used in the embodiments of 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. Thus, 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. 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.

[0039] 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 mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0040] See Figures 1 to 2 , Figure 1 This is a schematic flowchart of an embodiment of the display panel detection method provided in this application. Figure 2 yes Figure 1 A flowchart illustrating step S3 in the provided method for detecting the display panel.

[0041] See Figure 1 This application provides a method for detecting a display panel. The display panel includes an array substrate and a counter substrate disposed opposite to each other. The detection method is used to detect the conduction state of the common electrode of the array substrate and the common electrode of the counter substrate. Specifically, the method for detecting the display panel includes:

[0042] S1: Displays the image on the display panel.

[0043] Specifically, a lighting test is performed on the display panel to enable it to display an image. Along the horizontal (left-right) direction of the display panel, from right to left of the displayed image, the grayscale of the image gradually transitions from dark to light, with the grayscale value transitioning from 0 to 255. The display panel can display WRGB images, or any of the following: RGB, RG, GB, WR, WGB, etc.

[0044] Both the array substrate and the counter substrate of the display panel include a common electrode. The common electrode of the array substrate and the common electrode of the counter substrate are electrically connected through a conductive component. Specifically, the conductive component may include a gold ball, with both ends of the gold ball electrically connected to the common electrode of the array substrate and the common electrode of the counter substrate, respectively, thereby making the common electrode of the array substrate and the common electrode of the counter substrate conductive. When the common electrode of the array substrate and the common electrode of the counter substrate are electrically connected at both ends of the gold ball, that is, when the common electrode of the array substrate and the common electrode of the counter substrate are conductive, the potentials of the common electrode of the array substrate and the common electrode of the counter substrate are the same. When the display panel is tested with a lamp, the display panel will display a normal tonal image. From the right side to the left side of the display image, the grayscale of the display image transitions evenly from dark to bright, and the grayscale transition is uniform without any color deviation.

[0045] However, since the array substrate and the counter substrate include alignment films, when the gold ball does not pierce the alignment film of the array substrate or the counter substrate, the gold ball cannot electrically connect the common electrode of the array substrate to the common electrode of the counter substrate. That is, when the common electrode of the array substrate and the common electrode of the counter substrate are not connected, the display panel will still display a tone image, but the display image of the display panel will have problems such as poor tone color deviation and uneven grayscale transition. Moreover, the poor tone color deviation is difficult to detect and is easy to miss.

[0046] Specifically, when the common electrode of the array substrate and the common electrode of the counter substrate are not connected, the potential of the common electrode of the counter substrate is in a floating state. Due to the liquid crystal capacitor between the array substrate and the counter substrate, the capacitive coupling between the array substrate and the counter substrate causes a certain charge on one side of the common electrode of the counter substrate, and the potential of the common electrode of the counter substrate is adjusted to a certain level. Specifically, the potential of the common electrode of the counter substrate is close to the normal level of the common electrode, and the display panel can still display an image when the lamp is turned on for testing. However, since the potential of the common electrode of the counter substrate is generated by capacitive coupling, under the action of capacitive coupling, the potential of the common electrode of the counter substrate is only close to the normal level of the common electrode, not equal to the normal level of the common electrode. The potential of the common electrode of the counter substrate does not reach the normal standard, and there is a voltage difference between the potential of the common electrode of the counter substrate and the normal level of the common electrode. The existence of the voltage difference causes poor gradation and color shift in the display image. From the right side to the left side of the display image on the display panel, the grayscale transition of the display image on the display panel is uneven.

[0047] S2: Ensure that the potentials of the common electrode of the substrate and the common electrode of the array substrate are kept consistent.

[0048] Specifically, after performing the lamp-on test on the display panel and displaying the image in step S1, the potentials of the common electrode of the substrate and the common electrode of the array substrate are kept consistent. When the common electrode of the substrate and the common electrode of the array substrate are conducting, their potentials are inherently consistent. Conversely, when the common electrode of the substrate and the common electrode of the array substrate are not conducting, their potentials are inherently inconsistent. In this embodiment, by keeping the potentials of the common electrode of the substrate and the common electrode of the array substrate consistent, the display image of the display panel will exhibit different changes depending on whether the common electrode of the substrate and the common electrode of the array substrate are in conducting or not conducting states, facilitating subsequent testing.

[0049] Specifically, step S2, which involves keeping the potential of the common electrode of the substrate and the common electrode of the array substrate consistent, may include connecting the common electrode of the substrate and the common electrode of the array substrate to the same voltage source.

[0050] It is understood that when the common electrode of the substrate and the common electrode of the array substrate are connected to the same voltage source, the potentials of the common electrodes of both the substrate and the array substrate are consistent with the potential of the voltage source, which facilitates subsequent detection and judgment. In other embodiments, other methods can also be used to ensure that the potentials of the common electrodes of the substrate and the array substrate are consistent.

[0051] Specifically, in one embodiment, the common electrode of the array substrate is grounded, that is, the potential of the common electrode of the array substrate is 0V. The above-mentioned step of connecting the common electrode of the substrate and the common electrode of the array substrate to the same voltage source includes: grounding the common electrode of the substrate.

[0052] Since the common electrode of the array substrate is grounded, by grounding the common electrode of the substrate, the potential of the common electrode of the substrate can be kept consistent with the potential of the common electrode of the array substrate, both being 0V, which facilitates subsequent detection and judgment.

[0053] In other embodiments, the potential of the common electrode of the array substrate may not be 0V. The common electrode of the substrate and the common electrode of the array substrate can be directly connected to the same voltage source, so that the potential of the common electrode of the substrate and the common electrode of the array substrate is consistent with the voltage source, which facilitates subsequent judgment.

[0054] In one specific embodiment, grounding the common electrode of the substrate includes:

[0055] One end of the connecting wire 3 is electrically connected to the end of the common electrode of the substrate located in the non-display area, and the other end of the connecting wire 3 is grounded.

[0056] Specifically, the display panel includes a display area and a non-display area surrounding the display area. A common electrode is partially located in the display area and partially in the non-display area. In this embodiment, the common electrode of the substrate is grounded via a connecting wire 3. One end of the connecting wire 3 is electrically connected to the portion of the common electrode of the substrate located within the non-display area. Specifically, one end of the connecting wire 3 is electrically connected to the end of the common electrode of the substrate located within the non-display area, and the other end of the connecting wire 3 is grounded. The connecting wire 3 can be a metal wire. It can be understood that directly connecting one end of the connecting wire 3 to the end of the common electrode of the substrate located within the non-display area simplifies the connection and facilitates electrical connection.

[0057] In other embodiments, other methods can be used to ground the common electrode of the substrate. For example, one end of the connecting wire 3 can be connected to the portion of the common electrode of the substrate located in the display area, or one end of the connecting wire 3 can be connected to the remaining portion of the portion of the common electrode of the substrate located in the non-display area except for the end. The other end of the connecting wire 3 is grounded to ground the common electrode of the substrate.

[0058] S3: Determine the conduction state of the common electrode of the array substrate and the common electrode of the counter substrate based on the changes in the display screen.

[0059] Specifically, after aligning the potentials of the common electrode of the substrate and the common electrode of the array substrate in step S2, the display screen of the display panel will change. The conduction state of the common electrode of the array substrate and the common electrode of the substrate can be determined based on the change in the display screen of the display panel.

[0060] See Figure 2 In one embodiment, step S3, which involves determining the conduction state of the common electrode of the array substrate and the common electrode of the counter substrate based on changes in the display screen of the display panel, includes:

[0061] S31: In response to a change in the brightness of the display screen, determine that the common electrode of the array substrate and the common electrode of the counter substrate are not connected.

[0062] Specifically, after aligning the potentials of the common electrode of the substrate and the common electrode of the array substrate in step S2, the display screen of the display panel will change. If the brightness of the display screen changes, the judgment result of the common electrode of the array substrate and the common electrode of the substrate is that they are not conducting, the display panel has a problem of poor tone color deviation, and the display panel is an abnormal panel.

[0063] In this embodiment, since the common electrode of the array substrate and the common electrode of the counter substrate are not connected, capacitive coupling causes the common electrode of the counter substrate to have a charge. The potential of the common electrode of the counter substrate is only close to the normal level, not equal to the normal standard value. The potential of the common electrode of the counter substrate and the common electrode of the array substrate are not equal. After aligning the potentials of the common electrode of the counter substrate and the common electrode of the array substrate, the potential of the common electrode of the counter substrate changes, causing the overall brightness of the display screen to change.

[0064] Specifically, in one embodiment, the common electrode of the array substrate is grounded, and the potential of the common electrode of the array substrate is 0V. When the common electrode of the array substrate and the common electrode of the opposing substrate are not connected, the potential of the common electrode of the opposing substrate is not 0V. By grounding the common electrode of the opposing substrate—specifically, by contacting one end of the connecting wire 3 with the common electrode of the opposing substrate and grounding the other end—the charge on one side of the common electrode of the opposing substrate is conducted away by the connecting wire 3. The charge flows from the common electrode of the opposing substrate to the grounded end of the connecting wire 3, thereby making the potential of the common electrode of the opposing substrate consistent with the potential of the common electrode of the array substrate, both being 0V. When the potential of the common electrode of the opposing substrate changes, the brightness of the displayed image on the display panel changes overall. When the display mode of the display panel is normal white mode, and there is no voltage difference between the potential of the common electrode of the opposing substrate and the common electrode of the array substrate, the displayed image on the display panel will appear entirely white, thus indicating that the display panel is defective and has poor tone and color shift. In this embodiment, by determining whether the display screen of the display panel is white, it is determined whether the common electrode of the array substrate and the common electrode of the counter substrate are not connected, thereby determining whether the display screen of the display panel has uneven grayscale transition and poor tone color deviation. The detection method is relatively simple and efficient.

[0065] In other embodiments, the displayed image on the display panel does not necessarily appear entirely white. As long as the potentials of the common electrode of the substrate and the common electrode of the array substrate are kept consistent—specifically, after connecting the common electrodes of the substrate and the array substrate to the same voltage source—the overall brightness of the displayed image changes, indicating that the display panel is defective and has poor tone color deviation. For example, when the display panel is in a normal black mode, connecting the common electrodes of the substrate and the array substrate to the same voltage source, such as when both the common electrodes of the substrate and the array substrate have high potentials, will result in the displayed image appearing entirely black, indicating that the display panel is defective and has poor tone color deviation.

[0066] In another embodiment, step S3, which involves determining the conduction state of the common electrode of the array substrate and the common electrode of the counter substrate based on changes in the display screen of the display panel, includes:

[0067] S32: In response to partial flickering of the display screen on the display panel, determine that the common electrode of the array substrate is connected to the common electrode of the counter substrate.

[0068] Specifically, after aligning the potentials of the common electrode of the substrate and the common electrode of the array substrate in step S2, the display screen of the display panel will change. If the display screen of the display panel flickers locally, the judgment result of the common electrode of the array substrate and the common electrode of the substrate is that they are conducting, the display panel does not have a problem with tone color deviation, and the display panel is a normal panel.

[0069] It is understandable that when the common electrode of the array substrate and the common electrode of the opposing substrate are in a conductive state, the display panel displays the image normally. The common electrode of the array substrate and the common electrode of the opposing substrate form a complete circuit. The common electrode of the opposing substrate is electrically connected to the common electrode of the array substrate through a conductive component, i.e., a gold ball, and is connected to the same voltage source. The potentials of the common electrode of the array substrate and the common electrode of the opposing substrate are originally equal. For example, if the common electrode of the array substrate is grounded, its potential is 0V. The common electrode of the opposing substrate is electrically connected to the common electrode of the array substrate through the gold ball, making its potential also 0V. When one end of the connecting wire 3 is electrically connected to the common electrode of the opposing substrate, and the other end is grounded, the common electrode of the opposing substrate is directly grounded through the connecting wire 3. Under the influence of the external connecting wire 3, the original circuit will experience local voltage instability, and the display image on the display panel will flicker locally before returning to normal. In this embodiment, by determining whether the display screen of the display panel flickers locally, it is determined whether the common electrode of the array substrate and the common electrode of the counter substrate are connected, thereby determining whether the display panel has poor tone color deviation. The detection method is relatively simple and efficient.

[0070] The display panel detection method provided in this embodiment is based on the fact that the common electrode of the array substrate and the common electrode of the counter substrate are not conductive, which is the cause of the poor tone color deviation of the display panel. It directly determines whether the display panel has poor tone color deviation by judging the conduction state of the common electrode of the array substrate and the common electrode of the counter substrate. It can detect the poor tone color deviation caused by the poor gray level transition of the display panel due to the lack of conduction between the common electrode of the array substrate and the common electrode of the counter substrate. It effectively detects the poor tone color deviation of the display panel, intercepts the display panels with poor tone color deviation, and effectively solves the problem of difficulty in detecting poor tone color deviation of the display panel and easy to miss detection in the prior art, thus improving the detection efficiency and accuracy.

[0071] See Figure 3 , Figure 3 This is a schematic diagram of an embodiment of the display panel detection device provided in this application. Figure 4 yes Figure 3 A schematic diagram of one embodiment of the provided display panel detection device. Figure 5 yes Figure 3A schematic diagram of another embodiment of the provided display panel detection device.

[0072] See Figure 3 This application provides a detection device 100 for a display panel. The display panel includes an array substrate and a counter substrate disposed opposite to each other. The detection device 100 is used to detect the conduction state of the common electrode of the array substrate and the common electrode of the counter substrate.

[0073] The detection device 100 includes an image acquisition component 2 and a detection circuit 1. The image acquisition component 2 is used to acquire images of the display screen of the display panel. The detection circuit 1 is electrically connected to the image acquisition component 2 and is used to receive the images of the display screen acquired by the image acquisition component 2. Based on the changes in the display screen, the detection circuit 1 determines the conduction state of the common electrode of the array substrate and the common electrode of the counter substrate. By using the display panel detection device 100 provided in this application, the conduction state of the common electrode of the array substrate and the common electrode of the counter substrate can be determined, thereby effectively detecting the tone color deviation defect of the display panel. This effectively solves the problems of difficulty in detecting tone color deviation defects and easy missed detection in the prior art, and improves the detection efficiency and accuracy.

[0074] Specifically, the display panel includes a driving circuit, and a detection circuit 1 is electrically connected to the driving circuit of the display panel. The detection circuit 1 can receive a detection signal, which can be any signal such as a touch signal or a press signal. In response to receiving the detection signal, the detection circuit 1 sends a light-up command to the driving circuit to display the screen. The driving circuit of the display panel receives the light-up command and drives the display panel to display the screen to perform a light-up test, so as to test the display panel.

[0075] Specifically, the lighting command can be a WRGB display command to instruct the driver circuit to drive the display panel to display the WRGB image. Alternatively, the lighting command can be a command to display any of the following images: RGB, RG, GB, WR, WGB, etc., to instruct the driver circuit to drive the display panel to display any of these images. After the driver circuit successfully drives the display panel to display the image, along the horizontal (left-right) direction of the display panel, from right to left, the grayscale of the displayed image transitions from dark to light, with the grayscale value transitioning from 0 to 255.

[0076] In this embodiment, after the detection circuit 1 sends a lighting command to the driving circuit to display the screen, and the driving circuit of the display panel receives the lighting command and drives the display panel to display the screen, it is necessary to keep the potential of the common electrode of the substrate and the common electrode of the array substrate consistent. Specifically, the common electrode of the substrate and the common electrode of the array substrate can be connected to the same voltage source.

[0077] Specifically, in this embodiment, the detection device 100 of the display panel further includes a connecting wire 3, which is used to electrically connect to the common electrode of the display substrate and to connect the common electrode of the display substrate and the common electrode of the array substrate to the same voltage source so that the potentials of the common electrode of the display substrate and the common electrode of the array substrate are kept consistent, thereby facilitating the detection and judgment of the conduction state of the common electrode of the display substrate and the common electrode of the array substrate.

[0078] See Figure 4 In one embodiment, the common electrode of the array substrate is grounded, and the potential of the common electrode of the array substrate is 0V. The connecting wire 3 is used to ground the common electrode of the array substrate, so that the potential of the common electrode of the array substrate and the common electrode of the array substrate are kept consistent, both being 0V. Figure 4 As shown, the detection circuit 1 is electrically connected to the connecting wire 3 to ground the connecting wire 3. Specifically, one end of the connecting wire 3 is electrically connected to the common electrode of the substrate, and the other end is electrically connected to the detection circuit 1. By grounding the connecting wire 3 through the detection circuit 1, the common electrode of the substrate is grounded. When the connecting wire 3 is electrically connected to the common electrode of the substrate, it can be made to contact the end of the common electrode located in the non-display area, making the connection simpler and more efficient. Alternatively, one end of the connecting wire 3 can be connected to other locations on the common electrode of the substrate to achieve electrical connection between the connecting wire 3 and the common electrode, thereby grounding the common electrode of the substrate.

[0079] like Figure 4As shown, in one specific embodiment, the detection device 100 further includes a driving device 4 and a clamping assembly 5 connected to each other. The driving device 4 is electrically connected to the detection circuit 1, and the clamping assembly 5 is electrically connected to one end of the connecting wire 3. The image acquisition component 2 is also used to acquire images of the display panel. In response to the image acquisition component 2 acquiring an image of the display panel, that is, in response to the display panel starting to display a screen, the detection circuit 1 sends a driving command to the driving device 4. The driving device 4 drives the clamping assembly 5 to clamp the edge of the substrate according to the driving command, so that the clamping assembly 5 is electrically connected to the common electrode of the substrate. That is, when the image acquisition component 2 acquires the display panel starting to display a screen, the driving device 4 immediately drives the clamping assembly 5 to clamp the edge of the substrate, so that the clamping assembly 5 is electrically connected to the common electrode of the substrate, that is, the clamping assembly 5 is electrically connected to the end of the common electrode of the substrate located in the non-display area, thereby making the common electrode of the substrate electrically connected to the connecting wire 3. Since the connecting wire 3 is electrically connected to the detection circuit 1, the common electrode of the substrate is grounded through the detection circuit 1. With the above setup, the connection between the components is simple, and automated testing is achieved, which can effectively improve the testing efficiency of the display panel and save time.

[0080] In other embodiments, one end of the connecting wire 3 is electrically connected to the common electrode of the substrate, while the other end may not be electrically connected to the detection circuit 1. Instead, the other end of the connecting wire 3 can be directly grounded, thereby grounding the common electrode of the substrate. This means the common electrode of the substrate is grounded without going through the detection circuit 1, ensuring that the potential of the common electrode of the substrate is consistent with the potential of the common electrode of the array substrate, both being 0V. Alternatively, the clamping assembly 5 and the driving device 4 may be omitted, and the electrical connection between the connecting wire 3 and the common electrode of the substrate may be achieved through other structures or methods. Alternatively, the connecting wire 3 may be omitted, and other structures or methods may be used to ground the common electrode of the substrate.

[0081] In this embodiment, the image acquisition component 2 is used to acquire images of the display screen of the display panel and send the acquired images of the display screen of the display panel to the detection circuit 1. The detection circuit 1 receives the images of the display screen of the display panel acquired by the image acquisition component 2 and makes a judgment.

[0082] Specifically, in this embodiment, the detection circuit 1 is also used to detect the connection status between the connecting wire 3 and the common electrode of the substrate. In response to detecting that the connecting wire 3 is electrically connected to the common electrode of the substrate, the detection circuit 1 sends a command to the image acquisition component 2 to acquire an image of the display panel. That is, after the detection circuit 1 detects that the connecting wire 3 is electrically connected to the common electrode of the substrate, that is, after the potential of the common electrode of the substrate and the common electrode of the array substrate are consistent, the detection circuit 1 sends a command to the image acquisition component 2. This command is a command to acquire an image of the display panel. After receiving the command, the image acquisition component 2 acquires an image of the display panel and sends it to the detection circuit 1. The detection circuit 1 receives the image of the display panel acquired by the image acquisition component 2, determines the conduction status of the common electrode of the array substrate and the common electrode of the substrate based on the image of the display panel, and then determines whether the display panel has poor tone color deviation.

[0083] In one embodiment, the detection circuit 1 is used to determine, in response to a change in the brightness of the display screen on the display panel, that the common electrode of the array substrate and the common electrode of the counter substrate are not conductive. That is, when the detection circuit 1 receives the image of the display screen captured by the image acquisition component 2, if the overall brightness of the display screen changes, the detection circuit 1 determines, in response to the change in brightness, that the common electrode of the array substrate and the common electrode of the counter substrate are not conductive, indicating that the display panel has a problem with tone color deviation, and that the display panel is a defective panel.

[0084] Specifically, when the common electrode of the array substrate and the common electrode of the counter substrate are not connected, due to the capacitive coupling effect of the liquid crystal capacitor, the potential of the common electrode of the counter substrate is only close to the normal level, and the display panel displays an image. However, the potential of the common electrode of the counter substrate does not reach the standard value, resulting in color deviation in the displayed image. Furthermore, the potentials of the common electrodes of the counter substrate and the array substrate are not consistent. When the common electrodes of the counter substrate and the array substrate are connected to the same voltage source, i.e., when their potentials are aligned, the potential of the common electrode of the counter substrate changes, causing an overall change in the brightness of the displayed image. Therefore, when the detection circuit 1 receives the image of the displayed image from the image acquisition component 2, and the brightness of the displayed image changes, it can be determined that the display panel has a tone color deviation problem, and the display panel is defective.

[0085] For example, when the common electrode of the array substrate is grounded, its potential is 0V. When the common electrode of the array substrate is not connected to the common electrode of the substrate, its potential is not 0V. After grounding the common electrode of the array substrate, its potential becomes 0V. This change in potential alters the overall brightness of the display panel. When the display panel is in normal white mode, the entire display screen will appear white. Therefore, if the image of the display panel captured by the image acquisition component 2 is white when the detection circuit 1 receives it, it indicates that the common electrode of the array substrate is not connected to the common electrode of the substrate, resulting in poor tone and color shift in the display panel, making it a defective panel. In other embodiments, it is not only determined that the common electrode of the substrate and the common electrode of the array substrate are not conducting when the image of the display panel captured by the image acquisition component 2 is completely white when the detection circuit 1 receives the image. As long as the potential of the common electrode of the substrate and the common electrode of the array substrate are consistent, and the overall brightness of the image of the display panel captured by the image acquisition component 2 changes when the detection circuit 1 receives the image, it can be determined that the common electrode of the substrate and the common electrode of the array substrate are not conducting, and the display panel has poor tone color deviation.

[0086] In another embodiment, the detection circuit 1 is used to determine, in response to partial flickering of the display screen on the display panel, that the common electrode of the array substrate and the common electrode of the counter substrate are connected. That is, when the detection circuit 1 receives the image of the display screen captured by the image acquisition component 2, if the display screen of the display panel is partially flickering, the detection circuit 1 determines, in response to the partial flickering of the display screen, that the common electrode of the array substrate and the common electrode of the counter substrate are in a connected state, indicating that the display panel does not have a problem with tone color deviation, and that the display panel is a normal panel.

[0087] In this embodiment, after the detection circuit 1 detects that the connecting wire 3 is electrically connected to the common electrode of the substrate, that is, the potentials of the common electrode of the substrate and the common electrode of the array substrate are consistent, the image acquisition component 2 then acquires the image of the display panel. The detection circuit 1 determines whether the common electrode of the array substrate and the common electrode of the substrate are connected based on whether the brightness of the acquired display panel image changes or whether the display image flickers locally.

[0088] In other embodiments, the image acquisition component 2 can also begin acquiring images of the display panel before the common electrode of the substrate is grounded. For example, the image acquisition component 2 can acquire images of the display panel immediately after the driving circuit drives the display panel to display images. The image acquisition process can be continuous, that is, the image acquisition component 2 can continuously acquire images of the display panel and send them to the detection circuit 1. The detection circuit 1 determines whether the common electrode of the array substrate and the common electrode of the substrate are connected based on the changes in the images of the display panel received during this continuous process. For example, if the display panel changes from a normal WRGB image to an overall change in brightness, such as the entire display panel appearing white, the detection circuit 1 determines that the common electrode of the array substrate and the common electrode of the substrate are not connected; if the display panel changes from a normal WRGB image to partial flickering, the detection circuit 1 determines that the common electrode of the array substrate and the common electrode of the substrate are connected.

[0089] See Figure 5 In another embodiment, the common electrode of the array substrate may not be grounded, and the voltage of the voltage source connected to the common electrode of the array substrate may not be 0V. One end of the connecting wire 3 is electrically connected to the clamping component 5, and the other end of the connecting wire 3 is not connected to the detection circuit 1, but is directly connected to the voltage source. In response to the image acquisition component 2 acquiring the image of the display panel, that is, in response to the display panel starting to display the screen, the detection circuit 1 sends a drive command to the driving device 4. The driving device 4 drives the clamping component 5 to clamp the edge of the display substrate according to the drive command, so that the clamping component 5 is electrically connected to the common electrode of the display substrate. Specifically, the clamping component 5 is electrically connected to the end of the common electrode of the display substrate located in the non-display area. Since one end of the connecting wire 3 is electrically connected to the clamping component 5 and the other end is electrically connected to the voltage source connected to the common electrode of the array substrate, the common electrode of the display substrate and the common electrode of the array substrate are connected to the same voltage source, so that the potential of the common electrode of the display substrate and the common electrode of the array substrate is consistent with the potential of the voltage source. Based on the image of the display panel captured by the image acquisition component 2 received by the detection circuit 1, the conduction status of the common electrode of the array substrate and the common electrode of the counter substrate is determined, thereby determining whether there is a tone color deviation defect in the display panel.

[0090] Specifically, when the brightness of the display screen captured by the image acquisition component 2 changes, as received by the detection circuit 1, it indicates that the common electrode of the substrate and the common electrode of the array substrate are not conducting, resulting in a display panel malfunction and poor tone color shift. For example, when the display panel is in a normally black mode, if the common electrode of the substrate and the common electrode of the array substrate are not conducting, connecting the common electrode of the array substrate and the common connection of the substrate to the same voltage source, which is at a high potential, will cause an overall change in the brightness of the display screen. Specifically, the entire display screen will appear black. When the display screen captured by the image acquisition component 2 is entirely black, it is determined that the common electrode of the substrate and the common electrode of the array substrate are not conducting, indicating a display panel malfunction and poor tone color shift. When the display screen captured by the image acquisition component 2 shows partial flickering, it indicates that the common electrode of the substrate and the common electrode of the array substrate are conducting, indicating a normal display panel and no problem with poor tone color shift.

[0091] This application provides a method and apparatus 100 for detecting a display panel. The display panel includes an array substrate and a counter substrate disposed opposite to each other. The detection method is used to detect the conduction state of the common electrode of the array substrate and the common electrode of the counter substrate. The detection method includes: displaying an image on the display panel; maintaining the potential of the common electrode of the counter substrate and the common electrode of the array substrate at the same level; and determining the conduction state of the common electrode of the array substrate and the common electrode of the counter substrate based on the changes in the displayed image on the display panel. Through the above method, the conduction state of the common electrode of the array substrate and the common electrode of the counter substrate can be determined, thereby effectively detecting tone color deviation defects in the display panel. This solves the problems of difficulty in detecting tone color deviation defects and easy missed detection in the prior art, improving detection efficiency and accuracy, and avoiding missed detections.

[0092] 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 method for detecting a display panel, the display panel comprising an array substrate and a counter substrate disposed opposite to each other, the method being used to detect the conduction state of a common electrode of the array substrate and a common electrode of the counter substrate; characterized in that, include: The display panel displays an image; The potential of the common electrode of the substrate is kept consistent with that of the common electrode of the array substrate. Based on the changes in the display screen, the conduction state of the common electrode of the array substrate and the common electrode of the counter substrate is determined.

2. The method for detecting a display panel according to claim 1, characterized in that, The step of aligning the potential of the common electrode of the substrate with that of the array substrate includes: The common electrode of the substrate and the common electrode of the array substrate are connected to the same voltage source.

3. The method for detecting a display panel according to claim 2, characterized in that, The common electrode of the array substrate is grounded; connecting the common electrode of the array substrate and the common electrode of the array substrate to the same voltage source includes: The common electrode of the substrate is grounded.

4. The method for detecting a display panel according to claim 3, characterized in that, Grounding the common electrode of the substrate includes: One end of the connecting wire is electrically connected to the end of the common electrode of the substrate located in the non-display area, and the other end of the connecting wire is grounded.

5. The method for detecting a display panel according to claim 1, characterized in that, The step of determining the conduction state of the common electrode of the array substrate and the common electrode of the counter substrate based on changes in the display screen of the display panel includes: In response to a change in the brightness of the display screen, it is determined that the common electrode of the array substrate and the common electrode of the opposing substrate are not connected.

6. The method for detecting a display panel according to claim 1, characterized in that, The step of determining the conduction state of the common electrode of the array substrate and the common electrode of the counter substrate based on changes in the display screen of the display panel includes: In response to partial flickering of the display screen on the display panel, it is determined that the common electrode of the array substrate is connected to the common electrode of the counter substrate.

7. A detection device for a display panel, the display panel comprising an array substrate and a counter substrate disposed opposite to each other, the detection device being used to detect the conduction state of a common electrode of the array substrate and a common electrode of the counter substrate; characterized in that, include: An image acquisition component is used to acquire images of the display screen on the display panel; The detection circuit is electrically connected to the image acquisition component; The detection circuit is used to receive the image of the display screen captured by the image acquisition component, and to determine the conduction state of the common electrode of the array substrate and the common electrode of the counter substrate based on the changes in the display screen of the display panel.

8. The detection device for the display panel according to claim 7, characterized in that, The detection circuit is used to determine, in response to a change in the brightness of the display screen of the display panel, that the common electrode of the array substrate and the common electrode of the counter substrate are not connected.

9. The detection device for the display panel according to claim 7, characterized in that, The detection circuit is used to determine, in response to partial flickering of the display screen of the display panel, whether the common electrode of the array substrate is connected to the common electrode of the counter substrate.

10. The detection device for the display panel according to claim 7, characterized in that, The detection circuit is also used to be electrically connected to the driving circuit of the display panel; and in response to receiving a detection signal, the detection circuit sends a light-up command for the display screen to the driving circuit. The detection device further includes a connecting wire for electrically connecting to the common electrode of the counter substrate; the connecting wire is also used to connect to the same voltage source as the common electrode of the array substrate, so that the potentials of the common electrode of the counter substrate and the common electrode of the array substrate are kept consistent.

11. The detection device for the display panel according to claim 10, characterized in that, The common electrode of the array substrate is grounded, and the detection circuit is electrically connected to the connecting wire to ground the connecting wire; the detection circuit is also used to detect the connection status between the connecting wire and the common electrode of the opposing substrate; and in response to detecting that the connecting wire is electrically connected to the common electrode of the opposing substrate, the detection circuit sends an instruction to the image acquisition component to acquire an image of the display screen of the display panel.

12. The detection device for a display panel according to claim 10, characterized in that, It also includes a drive device and a clamping assembly connected to each other; the drive device is electrically connected to the detection circuit, and the clamping assembly is electrically connected to one end of the connecting wire; the image acquisition assembly is also used to acquire an image of the display panel; and in response to the image acquisition assembly acquiring an image of the display panel, the detection circuit sends a drive command to the drive device, and the drive device drives the clamping assembly to clamp the edge of the opposing substrate according to the drive command, so that the clamping assembly is electrically connected to the common electrode of the opposing substrate.

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