A method for detecting a display panel

Abstract

The present invention discloses a detection method for a display panel. The detection method comprises: receiving a detection result sent by a detection module; wherein the detection result comprises a plurality of line coordinates and a peak value corresponding to each line coordinate; judging whether each peak value is within a preset range; if not, sending the line coordinates corresponding to the peak value beyond the preset range to a manual inspection end, so that an inspector can check whether a line corresponding to the line coordinates and located in a panel drive unit setting area is faulty. The technical solution provided by the present invention can expand the detection area and improve the detection rate of defects in the panel drive unit setting area.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of display technology, and in particular to a method for detecting a display panel. Background Art

[0002] With the development of display technology, display panels such as liquid crystal display panels and organic light emitting display panels are widely used in display devices such as mobile phones and computers. Since the quality of display panels directly affects the performance of display devices, the detection of display panels becomes particularly important.

[0003] Figure 1 Schematic diagram of a detection module detecting a display panel provided by a related art. Figure 1 When the display panel is tested for defects, the detection module (for example, including the first detection unit LDS1' and the second detection unit LDS2') in the line open circuit inspection machine usually moves in the direction indicated by the arrow to detect the line L1' in the display area AA'. Since the line L2' in the panel drive unit setting area BA' in the non-display area DA' is relatively complex, the current detection method cannot achieve fault detection and coordinate positioning. Therefore, the line open circuit inspection machine can only detect the horizontal line ( Figure 1 This may cause the display panel to leak, resulting in a waste of manpower and financial resources. Summary of the invention

[0004] An object of the present invention is to provide a method for inspecting a display panel, which can expand the inspection area and improve the detection rate of defects in the panel drive unit setting area.

[0005] To achieve the above object, the present invention adopts the following technical solutions:

[0006] A display panel detection method is provided, comprising: receiving a detection result sent by a detection module; wherein the detection result comprises a plurality of line coordinates and a peak value corresponding to each of the line coordinates;

[0007] Determining whether each of the peak values ​​is within a preset range;

[0008] If not, the line coordinates corresponding to the peak value beyond the preset range are sent to a manual inspection end, so that an inspector can check whether a line corresponding to the line coordinates and located in the panel drive unit setting area is faulty.

[0009] As a preferred solution of the display panel detection method, the detection module includes a moving frame and at least one detection unit pair, the detection unit pair includes two detection units, and the moving frame includes a guide rail extending along a first direction;

[0010] The detection result sent by the receiving detection module includes:

[0011] Controlling the detection unit to move along the guide rail;

[0012] Controlling the moving frame to move along a second direction; wherein the first direction intersects with the second direction;

[0013] Receive the detection result sent by the detection unit.

[0014] As a preferred solution of the detection method of the display panel, the detection module further includes a tilting motor arranged on the moving frame, and one detection unit of the detection unit pair is electrically connected to the tilting motor;

[0015] Before controlling the detection unit to move along the guide rail, the method further includes:

[0016] The tilt motor is controlled to drive the detection unit electrically connected thereto to deflect, so that the detection unit electrically connected to the tilt motor is offset by a preset angle relative to the second direction.

[0017] As a preferred solution of the detection method of the display panel, the detection unit includes a plurality of sensors, and the signals received by the sensors are filtered and then integrated twice to obtain the peak value.

[0018] As a preferred solution of the display panel detection method, the signal received by the sensor is filtered using a second-order bandpass filter.

[0019] As a preferred solution of the display panel detection method, the transfer formula of the second-order bandpass filter is:

[0020]

[0021] Where Q is the quality factor, ω n is the center frequency, A vp is the passband gain, and S is the value of each response voltage after Laplace transformation.

[0022] As a preferred solution of the display panel detection method, the preset range is -1000V to 1000V.

[0023] As a preferred scheme of the display panel detection method, the display panel detection method also includes: if the inspector finds that the line corresponding to the peak value exceeding the preset range and located in the panel drive unit setting area is faulty, the line coordinates corresponding to the faulty line located in the panel drive unit setting area are sent to the maintenance end.

[0024] As a preferred scheme of the display panel detection method, the display panel detection method also includes: if the inspector does not find that the line located in the panel drive unit setting area corresponding to the peak value exceeding the preset range is faulty, it is determined that the performance of the line located in the panel drive unit setting area corresponding to the line coordinate is good.

[0025] As a preferred solution of the display panel detection method, the detection result also includes the line coordinates and the corresponding capacitance values; the display panel detection method also includes:

[0026] It is determined according to the capacitance value whether a circuit corresponding to the line coordinates corresponding to the capacitance value and located in the display area is broken.

[0027] The beneficial effects of the present invention are as follows: by receiving the line coordinates and peak values ​​sent by the detection module, it is determined whether each peak value is within a preset range. If not, the line coordinates corresponding to the peak values ​​that exceed the preset range are sent to the manual inspection end, so that the inspector can check whether the line corresponding to the line coordinates and located in the panel drive unit setting area is faulty, thereby realizing the detection of the panel drive unit setting area. The drawback of the prior art that it is impossible to detect whether there is a fault in the panel drive unit setting area is solved, and the detection area of ​​the display panel is expanded, and the detection rate of the defective panel drive unit setting area is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of a detection module provided by the related technology detecting a display panel;

[0029] Figure 2 is a flow chart of a display panel detection method provided by an embodiment of the present invention;

[0030] Figure 3 is a flow chart of another display panel detection method provided by an embodiment of the present invention;

[0031] Figure 4 is a schematic diagram of a detection module provided by an embodiment of the present invention detecting a display panel;

[0032] Figure 5 is a schematic diagram of a signal before preprocessing provided by an embodiment of the present invention;

[0033] Figure 6 yes Figure 5 Schematic diagram of the signal after filtering;

[0034] Figure 7 yes Figure 6 Schematic diagram of the signal after one integration;

[0035] Figure 8 yes Figure 7Schematic diagram of the signal after secondary integration;

[0036] Fig. 9 is a flow chart of another display panel detection method provided by an embodiment of the present invention;

[0037] Figure 1 middle:

[0038] AA', display area; DA', non-display area; BA', panel drive unit setting area; LDS1', first detection unit; LDS2', second detection unit; L1', line located in the display area; L2', line located in the panel drive unit setting area;

[0039] Figure 4 middle:

[0040] AA, display area; DA, non-display area; BA, panel drive unit setting area; L1, line located in the display area; L2, line located in the panel drive unit setting area; LDS1, first detection unit; LDS2, second detection unit; LDS3, third detection unit; LDS4, fourth detection unit; LDS5, fifth detection unit; LDS6, sixth detection unit; YDJ, movable frame; X, first direction; Y, second direction. DETAILED DESCRIPTION

[0041] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0042] The advantages and features of the present invention and methods for achieving them will become apparent with reference to the embodiments described in detail below in conjunction with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various different forms. This embodiment is provided only to complete the disclosure of the present invention and to enable those skilled in the art to fully understand the scope of the present invention, and the present invention is limited only by the scope of the claims. The same reference numerals represent the same constituent elements throughout the specification.

[0043] Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

[0044] Figure 2This is a flow chart of a display panel detection method provided by an embodiment of the present invention. The method can be applied to the case of quality detection of a display panel. Typically, the embodiment of the present application is applicable to the case of quality detection of a panel drive unit setting area of ​​a display panel. The method can be specifically performed by a detection device, which can be implemented by software and / or hardware, and the device can be integrated in an electronic device capable of the detection method (e.g., a line open circuit detection machine). See Figure 2 The display panel detection method specifically includes the following steps:

[0045] S110: Receive the detection result sent by the detection module.

[0046] Specifically, the detection module may be a detection module in a line open circuit inspection machine. The detection module scans the display panel to be detected to obtain a detection result. The detection result includes a plurality of line coordinates and peak values ​​corresponding to each line coordinate. Specifically, a plurality of lines are provided in the panel drive section setting area, and the lines are used to connect the driver chip (located in the panel drive section setting area) and the lines located in the display area. The line coordinates can be used to locate the line located in the panel drive section setting area corresponding to the line coordinates, that is, there is a corresponding relationship between the line coordinates, the line located in the panel drive section setting area, and the peak value. When a line located in the panel drive section setting area fails, the corresponding peak value will be abnormal.

[0047] S120: Determine whether each peak value is within a preset range.

[0048] Specifically, before testing the display panel to be tested, a plurality of display panel samples are tested to determine the preset range. Exemplarily, for each display panel sample, first, the test result sent by the detection module is received, and the test result includes the line coordinates and the corresponding peak value; then, the inspector checks whether the line corresponding to each line coordinate and located in the panel drive unit setting area is faulty; then, the situation of whether each line located in the panel drive unit setting area is faulty and the corresponding peak value are recorded; then, all the collected situations of whether the lines located in the panel drive unit setting area are faulty and the corresponding peak values ​​are counted, and it is determined that when the peak value is within a certain range, the situation of the line fault in the panel drive unit setting area accounts for a preset proportion (for example, 50%, but not limited to this), and the obtained range is the preset range. Optionally, the preset range is -1000V to 1000V. After conducting testing experiments on multiple display panel samples, the applicant found that when the preset range is -1000V to 1000V, the proportion of faulty lines located in the panel driver unit setting area is 50%. Therefore, when the preset range is set to -1000V to 1000V, the proportion of faulty lines located in the panel driver unit setting area corresponding to the peak values ​​exceeding the preset range can be theoretically around 50%. This is beneficial for improving the detection rate of defects in the panel driver unit setting area and avoiding excessive workload for subsequent inspectors to check whether the lines located in the panel driver unit setting area are faulty.

[0049] S130, if not, the line coordinates corresponding to the peak value beyond the preset range are sent to a manual inspection terminal, so that an inspector can check whether the line corresponding to the line coordinates and located in the panel drive unit setting area is faulty.

[0050] Specifically, when the peak value does not exceed the preset range, it means that the probability of the line corresponding to the peak value in the panel drive unit setting area failing is low, and the inspector does not need to manually inspect the line corresponding to the peak value in the panel drive unit setting area; when the peak value of the detection signal exceeds the preset range, it means that the probability of the line corresponding to the peak value in the panel drive unit setting area failing is high, and the inspector needs to manually inspect the line corresponding to the peak value in the panel drive unit setting area. In this way, the detection rate of defects in the panel drive unit setting area can be improved.

[0051] Optionally, the display panel detection method also includes: if the inspector finds that the line corresponding to the peak value exceeding the preset range and located in the panel drive unit setting area is faulty, the line coordinates corresponding to the faulty line located in the panel drive unit setting area are sent to the maintenance end.

[0052] It can be understood that by sending the line coordinates corresponding to the faulty line located in the panel drive unit setting area to the maintenance end, the maintenance personnel can quickly locate the faulty line located in the panel drive unit setting area, and repair the faulty line located in the panel drive unit setting area, so that the display panel can be used normally afterwards, thereby improving the final yield of the array substrate preparation project.

[0053] Optionally, the detection method of the display panel also includes: if the inspector does not find that the circuit located in the panel drive unit setting area corresponding to the peak value exceeding the preset range is faulty, determining that the performance of the circuit located in the panel drive unit setting area corresponding to the peak value exceeding the preset range is good.

[0054] It can be understood that determining the circuits located in the panel driving unit setting area that have not failed as having good performance can allow the display panel to continue to flow into subsequent processes so that it can eventually be used normally, thus avoiding over-inspection.

[0055] The display panel detection method provided by the embodiment of the present invention receives the line coordinates and the corresponding peak values ​​sent by the detection module, and then determines whether each peak value is within a preset range. If not, the line coordinates corresponding to the peak values ​​that exceed the preset range are sent to the manual inspection end, so that the inspector can check whether the line corresponding to the line coordinates and located in the panel drive unit setting area is faulty, thereby realizing the detection of the panel drive unit setting area. The drawback of the prior art that it is impossible to detect whether there is a fault in the panel drive unit setting area is solved, and the detection area of ​​the display panel is expanded, the detection rate and repair rate of the panel drive unit setting area are improved, and the final yield of the array substrate preparation project is improved.

[0056] Figure 3 FIG. 1 is a flow chart of another display panel detection method provided by an embodiment of the present invention. Figure 3 The display panel detection method specifically includes the following steps:

[0057] S210, controlling the detection unit to move along the guide rail.

[0058] S220, controlling the moving frame to move along the second direction.

[0059] The first direction and the second direction intersect. It should be noted that the angle between the first direction and the second direction can be set by those skilled in the art according to actual conditions and is not limited here. Optionally, the first direction and the second direction are perpendicular.

[0060] Specifically, the detection module includes a mobile frame and at least one detection unit pair, the detection unit pair includes two detection units, and the mobile frame includes a guide rail extending along a first direction. Exemplarily, Figure 4is a schematic diagram of a detection module provided by an embodiment of the present invention detecting a display panel. In order to distinguish between the detection module detecting a display panel in the prior art and in the present application, different reference numerals are used for the same structure. Figure 4 The detection module includes a movable frame YDJ and six detection units LDS, wherein the first detection unit LDS1 and the second detection unit LDS2 constitute a detection unit pair, the third detection unit LDS3 and the fourth detection unit LDS4 constitute a detection unit pair, and the fifth detection unit LDS5 and the sixth detection unit LDS6 constitute a detection unit pair. In the process of the detection module scanning the display panel to be detected, the six detection units LDS can move along the first direction X, and the movable frame ZJ drives the detection unit LDS to move along the second direction Y. The composite movement of the six detection units LDS in the detection module can realize the scanning of the circuits in the entire display panel (including the circuit L1 located in the display area and the circuit L2 located in the panel drive unit setting area), thereby obtaining the detection results. In this way, the detection range can be expanded to the panel drive unit setting area BA. It should be noted that Figure 4 It is only exemplarily shown that the detection module includes three pairs of detection units, but it is not limited thereto, and those skilled in the art can set the number of detection unit pairs according to actual conditions. It can be understood that compared with setting a large number of fixed detection units LDS that do not move along the first direction X on the mobile frame YDJ, that is, a large number of detection units LDS are closely arranged along the first direction X and fixedly set on the mobile frame YDJ to realize the detection module to scan the entire display panel, in this application, by setting the detection unit LDS to move along the guide rail, and the mobile frame YDJ drives the detection unit LDS to move along the second direction Y, that is, the detection module is scanned by the composite movement of the detection unit LDS, which can effectively reduce the number of detection units LDS, which is conducive to reducing the cost of the detection module.

[0061] Optionally, the detection module also includes a tilt motor arranged on the movable frame, and one detection unit in the detection unit pair is electrically connected to the tilt motor; before controlling the detection unit pair to move along the guide rail, it also includes: controlling the tilt motor to drive the detection unit electrically connected to it to deflect, so that the detection unit electrically connected to the tilt motor is offset by a preset angle relative to the second direction.

[0062] Specifically, Figure 4The figure shows the situation without offset, in which case the two detection units LDS in the detection unit pair are not aligned horizontally (along the first direction X). When the tilt motor drives one detection unit in the detection unit pair to offset relative to the second direction, the two detection units in the detection unit pair can be aligned non-horizontally (along the first direction X), so that a better detection effect can be obtained. It should be noted that the specific value of the preset angle can be set by those skilled in the art according to actual conditions and is not limited here.

[0063] For example, Figure 4 The detection module shown in the figure can be configured such that the first detection unit LDS1, the third detection unit LDS3 and the fifth detection unit LDS5 are respectively electrically connected to a tilt motor, so that they can be offset by a preset angle relative to the second direction, but is not limited thereto. For example, the second detection unit LDS2, the fourth detection unit LDS4 and the sixth detection unit LDS6 can be respectively electrically connected to a tilt motor.

[0064] S230: Receive the detection result sent by the detection unit.

[0065] Specifically, the specific structure of the detection unit can be set by a person skilled in the art according to the actual situation, and is not limited here, as long as it can upload the line coordinates and the peak value corresponding to the line coordinates. Exemplarily, the detection unit includes a plurality of sensors, and one of the detection units in the detection unit pair can send a signal to another detection unit; or, each detection unit in the detection unit pair can send a signal to the other party and receive the signal sent by the other party; the signal will change after passing through the display panel to be detected (referred to as a fault detection result signal), carrying detection information, and the signal carrying the detection information can obtain a peak value after preprocessing.

[0066] Optionally, the detection unit includes a plurality of sensors, and the signals received by the sensors are filtered and then integrated twice to obtain a peak value. In this way, the peak value of the signal can be easily determined, which will be explained by examples in the following text.

[0067] Specifically, the specific type of filter used in the filtering operation can be set by those skilled in the art according to actual conditions, and is not limited here. Optionally, the signal received by the sensor is filtered using a second-order bandpass filter. It is understandable that the use of a second-order bandpass filter to filter the signal received by the detection unit can achieve a better filtering effect.

[0068] Specifically, the transfer formula of the ideal filter is:

[0069]

[0070] The transfer formula for a second-order bandpass filter is:

[0071] Where Q is the quality factor, ω n is the center frequency, A vp is the passband gain, and S is the value of each response voltage after Laplace transformation.

[0072] For example, Figure 5 It is a schematic diagram of a signal before preprocessing provided by an embodiment of the present invention. Figure 6 yes Figure 5 Schematic diagram of the signal after filtering. Figure 7 yes Figure 6 Schematic diagram of the signal after one integration. Figure 8 yes Figure 7 Schematic diagram of the signal after secondary integration. Figure 8 The center line code represents the line coordinates. Figure 5 and Figure 8 It can be seen that the signal received by the detection unit can be converted into a signal form that is convenient for determining the peak value after preprocessing.

[0073] S240: Determine whether each peak value is within a preset range.

[0074] S250, if not, the line coordinates corresponding to the peak value beyond the preset range are sent to a manual inspection terminal, so that an inspector can check whether the line corresponding to the line coordinates and located in the panel drive unit setting area is faulty.

[0075] Based on the above technical solution, optionally, the detection result also includes line coordinates and their corresponding capacitance values; the detection method of the display panel also includes: judging whether the line corresponding to the corresponding line coordinates and located in the display area is broken according to the capacitance value.

[0076] Specifically, the display area is provided with a plurality of lines, which are used to provide driving signals to pixels. The line coordinates can be used to locate the line located in the display area corresponding to the line coordinates, that is, the line coordinates and the line located in the display area correspond to each other.

[0077] Exemplarily, the detection unit may include multiple sensors based on the principle of capacitance and electric field, and the detection results uploaded by the detection unit also include line coordinates and their corresponding capacitance values. Specifically, one of the detection units in the detection unit pair may send a high-frequency signal to the other detection unit. When the high-frequency signal passes through the metal wire and does not pass through the metal wire, the change of the high-frequency signal is different. In this way, the capacitance value received by the detection unit at the receiving end is different. When the capacitance value does not exceed the preset capacitance threshold, it can be determined that the line corresponding to the line coordinate in the display area is not broken. When the capacitance value exceeds the preset capacitance threshold, it can be determined that the line corresponding to the line coordinate in the display area is broken.

[0078] For example, Fig. 9FIG. 1 is a flow chart of another display panel detection method provided by an embodiment of the present invention. Fig. 9 The display panel detection method specifically includes the following steps:

[0079] S310: Detect whether the coordinates sent by the module are line coordinates and their corresponding peak values. If yes, execute S330. If not, execute S320.

[0080] S320: Normal inspection and determination.

[0081] Specifically, S320 may include: the detection result also includes line coordinates and their corresponding capacitance values, and whether the line corresponding to the line coordinates and located in the display area is broken is determined based on the capacitance value, but is not limited to this, and may also include other detection items known to technical personnel in this field.

[0082] S330, determine whether each peak value is within a preset range. If yes, execute S340. If not, execute S350.

[0083] S340, sending the line coordinates corresponding to the peak value beyond the preset range to the manual inspection end, so that the inspector can check whether the line corresponding to the line coordinates and located in the panel driving unit setting area is faulty.

[0084] S350: It is determined that the line located in the panel drive unit installation area has no fault.

[0085] Specifically, if the inspector does not find that the line corresponding to the peak value exceeding the preset range and located in the panel drive unit setting area is faulty, it is determined that the performance of the line corresponding to the peak value exceeding the preset range and located in the panel drive unit setting area is good.

[0086] S360: It is determined that a circuit located in the panel drive unit installation area is faulty.

[0087] Specifically, if the inspector finds that the line corresponding to the peak value beyond the preset range and located in the panel drive unit setting area is faulty, the line coordinates corresponding to the faulty line located in the panel drive unit setting area can be sent to the maintenance end.

[0088] Although the embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above embodiments, but can be manufactured in various forms, and those skilled in the art will understand that the present invention can be implemented in other specific forms without changing the technical spirit or basic features of the present invention. Therefore, it should be understood that the above embodiments are exemplary and not restrictive in all aspects.

Claims

1. A method for detecting a display panel, characterized in that: include: Receive the detection result sent by the detection module; wherein the detection result includes a plurality of line coordinates and a peak value corresponding to each of the line coordinates; Determining whether each of the peak values ​​is within a preset range; If not, the line coordinates corresponding to the peak value that exceeds the preset range are sent to the manual inspection end, so that the inspector can check whether the line corresponding to the line coordinate and located in the panel drive unit setting area is faulty. The detection module includes a movable frame and at least one detection unit pair, the detection unit pair includes two detection units, and the movable frame includes a guide rail extending along a first direction; one of the detection units can be offset by a preset angle relative to the second direction. At this time, the two detection units are not horizontally aligned, and the first direction intersects with the second direction.

2. The display panel detection method according to claim 1, characterized in that: The detection result sent by the receiving detection module includes: Controlling the detection unit to move along the guide rail; Controlling the moving frame to move along the second direction; and receiving the detection result sent by the detection unit.

3. The display panel detection method according to claim 2, characterized in that: The detection module further comprises a tilting motor disposed on the mobile frame, and one detection unit of the detection unit pair is electrically connected to the tilting motor; Before controlling the detection unit to move along the guide rail, the method further includes: The tilt motor is controlled to drive the detection unit electrically connected thereto to deflect, so that the detection unit electrically connected to the tilt motor is offset by a preset angle relative to the second direction.

4. The display panel detection method according to claim 2, characterized in that: The detection unit includes a plurality of sensors, and the signals received by the sensors are filtered and then integrated twice to obtain the peak value.

5. The display panel detection method according to claim 4, characterized in that: The signal received by the sensor is filtered using a second-order bandpass filter.

6. The display panel detection method according to claim 5, characterized in that: The transfer formula of the second-order bandpass filter is: Where Q is the quality factor, ω n is the center frequency, A vp is the passband gain, and S is the value of each response voltage after Laplace transformation.

7. The display panel detection method according to claim 1, characterized in that: The preset range is -1000V to 1000V.

8. The display panel detection method according to claim 1, characterized in that: Also includes: If the inspector finds that the line located in the panel drive unit setting area corresponding to the peak value exceeding the preset range is faulty, the line coordinates corresponding to the faulty line located in the panel drive unit setting area are sent to the maintenance end.

9. The display panel detection method according to claim 1, characterized in that: Also includes: If the inspector does not find that the line located in the panel drive unit setting area corresponding to the peak value beyond the preset range is faulty, it is determined that the performance of the line located in the panel drive unit setting area corresponding to the line coordinate is good.

10. The display panel detection method according to claim 1, characterized in that: The detection result also includes the line coordinates and the corresponding capacitance values; The display panel detection method further includes: It is determined according to the capacitance value whether a circuit corresponding to the line coordinates corresponding to the capacitance value and located in the display area is broken.

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