Test fixture plate of display module and display module

Abstract

The invention discloses a test fixture plate of a display module and the display module. The display module comprises a binding bonding pad and a one-way conduction diode; the binding pad comprises a first panel test pin and a second panel test pin; the first panel test pin and the second panel test pin are electrically connected with the positive electrode and the negative electrode of the one-way conduction diode respectively. The jig plate comprises a connector and a test bonding pad; the connector is connected with a test video source; the test bonding pad comprises a first jig test pin and a second jig test pin; the positive and negative connection test signal end of the test video source is electrically connected with the first jig test pin through a connector, and the second jig test pin is grounded; and when the binding pad and the test pad are connected through the flexible circuit board, judging the positive and negative connection state of the flexible circuit board according to a feedback signal received by the positive and negative connection test signal end. According to the invention, the plugging mode of the FPC in the testing process can be accurately identified, misjudgment or damage caused by reverse plugging can be effectively prevented, and the production efficiency and the yield can be improved.

Description

Technical Field

[0001] The present invention relates to the field of display technology, and in particular to a test fixture board for a display module and a display module. Background Technology

[0002] Electronic display products are playing an increasingly important role in modern society, continuously enriching people's lives. In the manufacturing process of electronic display products, each display undergoes reliability testing, making it an essential production process for all companies.

[0003] Current reliability testing primarily involves manually connecting flexible printed circuit (FPC) cables to a video source to test the display of electronic display products. During this process, operators can easily misinterpret the connection, inserting the FPC cables into the electronic display product. This can lead to misjudgments of the product as faulty, or even damage to the product's circuitry. Products that were originally good can become defective due to incorrect insertion, significantly reducing production yield. Summary of the Invention

[0004] This invention provides a test fixture board and a display module for display modules, which can accurately identify the insertion method of FPC during the testing process, effectively prevent misjudgment or damage caused by reverse insertion, and improve production efficiency and yield.

[0005] In a first aspect, embodiments of the present invention provide a test fixture board for a display module, the display module including bonding pads and unidirectional diodes; the bonding pads are used to connect to one end of a flexible circuit board; the bonding pads include a first panel test pin and a second panel test pin.

[0006] The first panel test pin is electrically connected to the positive terminal of the unidirectional conduction diode, and the second panel test pin is electrically connected to the negative terminal of the unidirectional conduction diode.

[0007] The fixture board includes a connector and test pads; the connector is used to connect to a test video source; the test pads are used to connect to the other end of the flexible circuit board.

[0008] The test video source includes a positive and negative test signal terminal, and the test pad includes a first fixture test pin and a second fixture test pin; the positive and negative test signal terminal is electrically connected to the first fixture test pin through the connector, and the second fixture test pin is grounded; when the bonding pad and the test pad are connected through a flexible circuit board, one of the first fixture test pin and the second fixture test pin is connected to the first panel test pin, and the other is connected to the second panel test pin;

[0009] The test video source is configured as follows:

[0010] When connecting the bonding pads and the test pads through the flexible circuit board, the positive and negative connection status of the flexible circuit board is determined based on the feedback signal received by the positive and negative connection test signal terminal.

[0011] Secondly, embodiments of the present invention also provide a display module, including bonding pads and unidirectional conduction diodes; the bonding pads are used to connect to one end of a flexible circuit board; the bonding pads include a first panel test pin and a second panel test pin;

[0012] The first panel test pin is electrically connected to the positive terminal of the unidirectional conduction diode, and the second panel test pin is electrically connected to the negative terminal of the unidirectional conduction diode.

[0013] The display module is used in conjunction with the test fixture board of the display module as described in the first aspect for display testing.

[0014] The technical solution of this invention, through the corresponding structural design of the provided display module, test fixture board, and test video source, and their mutual cooperation during the testing phase, can obtain the conduction current based on the conduction state of the detection circuit, that is, the feedback signal received by the positive and negative test signal terminals of the test video source. During the display testing process of the display module, the insertion method of the flexible circuit board is automatically detected and accurately identified. This avoids the problem of misjudgment or damage caused by reverse insertion when manually inserting the flexible circuit board during the testing phase, helps to correct the insertion method of the flexible circuit board in a timely manner, conducts effective module testing, and helps to improve the production efficiency and yield of the product. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of a display module provided in an embodiment of the present invention;

[0016] Figure 2 This is a schematic diagram of the structure of a test fixture plate for a display module provided in an embodiment of the present invention;

[0017] Figure 3 and Figure 4 for Figure 2 The diagram shows the test fixture board in both the positive and negative connection states during the display test.

[0018] Figure 5 This is a schematic diagram of the structure of a test fixture plate for another display module provided in an embodiment of the present invention;

[0019] Figure 6 and Figure 7 for Figure 5The diagram shows the test fixture board in both the positive and negative connection states during the display test.

[0020] Figure 8 This is a schematic diagram of the structure of a test fixture plate for a display module provided in another embodiment of the present invention;

[0021] Figure 9 This is a schematic diagram of the structure of a test fixture plate for another display module provided in an embodiment of the present invention;

[0022] Figure 10 and Figure 11 for Figure 9 The diagram shows the test fixture board in both the positive and negative connection states during the display test.

[0023] Figure 12 This is a schematic diagram of the structure of a test fixture plate for a display module provided in another embodiment of the present invention. Detailed Implementation

[0024] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, and not all of the structures.

[0025] The terminology used in the embodiments of this invention is for the purpose of describing specific embodiments only and is not intended to limit the invention. It should be noted that directional terms such as "upper," "lower," "left," and "right" described in the embodiments of this invention are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this invention. Furthermore, in the context, it should be understood that when referring to an element being formed "on" or "below" another element, it can be formed not only directly on or below the other element, but also indirectly on or below it through intermediate elements. The terms "first," "second," etc., are used for descriptive purposes only and do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0026] The term "comprising" and its variations as used in this invention are open-ended, meaning "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment".

[0027] It should be noted that the concepts of "first" and "second" mentioned in this invention are only used to distinguish the corresponding contents and are not used to limit the order or interdependence.

[0028] It should be noted that the terms "a" and "a plurality of" used in this invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise expressly indicated in the context, they should be understood as "one or more".

[0029] Figure 1 This is a schematic diagram of the structure of a display module provided in an embodiment of the present invention, for reference. Figure 1 First, the display module 10 provided in this embodiment of the invention is used in conjunction with any of the test fixture boards 20 provided in this embodiment of the invention for display testing. The display module 10 includes bonding pads 11 and unidirectional conducting diodes 12; the bonding pads 11 are used to connect to one end of the flexible circuit board 30; the bonding pads 11 include a first panel test pin 111 and a second panel test pin 112; the first panel test pin 111 is electrically connected to the positive terminal of the unidirectional conducting diode 12, and the second panel test pin 112 is electrically connected to the negative terminal of the unidirectional conducting diode 12.

[0030] It is understood that display module 10 represents a screen module with display function. It is a semi-finished product before being shipped as a finished product and needs to undergo display function testing to verify product quality and facilitate the repair or elimination of products with quality problems. Display module 10 has a display screen for display and a corresponding circuit structure for driving the display screen. In addition, it also has related structures for display testing. Specifically, the display module 10 in this embodiment of the invention includes bonding pads 11. Bonding pads 11 can be understood as a circuit structure that connects to an external driving device through a flexible circuit board 30. For example, it can be connected to a test video source 40 during the testing stage, and the test video source 40 provides driving signals to drive the display module 10 to display, so as to facilitate the testing of display function. It can also be connected to a driver motherboard in the finished product stage, and the corresponding display function is executed through the control of the driver motherboard.

[0031] Furthermore, in this embodiment of the invention, a first panel test pin 111 and a second panel test pin 112 are provided in the bonding pad 11, along with a unidirectional conducting diode 12. The two panel test pins are connected to the two ends of the unidirectional conducting diode 12 in a fixed connection manner; that is, the first panel test pin 111 is connected to the positive terminal of the unidirectional conducting diode 12, and the second panel test pin 112 is connected to the negative terminal of the unidirectional conducting diode 12, forming a unidirectional series branch. Therefore, by utilizing the unidirectional conducting characteristic of the unidirectional conducting diode 12, when a conducting current is detected, it can be determined that a forward voltage difference is provided to the two ends of the first panel test pin 111 and the second panel test pin 112; when no conducting current is detected, it can be determined that a reverse voltage difference is provided to the two ends of the first panel test pin 111 and the second panel test pin 112. Furthermore, assuming the standard connection method (flexible circuit board 30 is in the forward-biased state) and the external voltage difference is provided during testing, when the branch is confirmed to be conducting during the testing phase, it can be determined that the flexible circuit board 30 and the display module 10 are in the forward-biased state. When the branch is confirmed to be cut off during the testing phase, it can be determined that the flexible circuit board 30 and the display module 10 are in the reverse-biased state. Of course, in the standard connection method (flexible circuit board 30 is in the forward-biased state), the external voltage difference can also be provided during testing. Therefore, the judgment logic is reversed, which will not be elaborated here.

[0032] Based on the same inventive concept, embodiments of the present invention also provide a test fixture plate for a display module. Figure 2 This is a schematic diagram of the structure of a test fixture plate for a display module provided in an embodiment of the present invention. Figure 3 and Figure 4 for Figure 2 The diagram shown illustrates the test fixture board in both positive and reverse connection states during the display test. (Refer to...) Figures 1-4 The fixture board provided in this embodiment of the invention includes a connector 22 and a test pad 21; the connector 22 is used to connect to a test video source 40; the test pad 21 is used to connect to the other end of a flexible circuit board 30; the test video source 40 includes a positive and negative test signal terminal 41, and the test pad 21 includes a first fixture test pin 211 and a second fixture test pin 212; the positive and negative test signal terminal 41 is electrically connected to the first fixture test pin 211 through the connector 22, and the second fixture test pin 212 is grounded; when the bonding pad 11 and the test pad 21 are connected through the flexible circuit board 30, one of the first fixture test pin 211 and the second fixture test pin 212 is connected to the first panel test pin 111, and the other is connected to the second panel test pin 112.

[0033] The test video source 40 is configured to determine the positive and negative connection status of the flexible circuit board 30 based on the feedback signal received by the positive and negative connection test signal terminal 41 when the bonding pad 11 and the test pad 21 are connected through the flexible circuit board 30.

[0034] Because the signal interfaces of the test video source 40 and the display module 10 are inconsistent—the signal output interface of the test video source 40 is a ribbon cable, while the signal input interface of the display module 10 is a bonding pad 11—interface conversion is required via the test fixture board 20. One end of the test fixture board 20 is connected to the test video source 40 via a ribbon cable, and the other end is connected to the display module 10 via a flexible circuit board 30, thereby providing the test signal from the test video source 40 to the display module 10 for display testing. Specifically, the test fixture board 20 of this embodiment is provided with a connector 22 for connecting to the test video source 40 via a ribbon cable, and also with test pads 21 for connecting to the display module 10 via the flexible circuit board 30. Furthermore, the test fixture board 20 of this embodiment of the invention is also provided with a first fixture test pin 211 and a second fixture test pin 212 in the test pad 21, and the test video source 40 is provided with a positive and negative test signal terminal 41. The positive and negative test signal terminal 41 is connected to the first fixture test pin 211 through the connector 22, while the second fixture test pin 212 is grounded. Thus, a positive and negative test voltage can be provided to the first fixture test pin 211 through the positive and negative test signal terminal 41, so that a voltage difference can be formed across the first fixture test pin 211 and the second fixture test pin 212. When the bonding pad 11 in the display module 10 and the test pad 21 on the test fixture board 20 are connected through the flexible circuit board 30, this voltage difference can be applied to the first panel test pin 111 and the second panel test pin 112. In other words, the positive and negative test signal terminal 41 of the test video source 40, the first fixture test pin 211, the series branch in the display module 10, and the second fixture test pin 212 can form a detection loop. The panel test pins connected to the first fixture test pin 211 and the panel test pins connected to the second fixture test pin 212 can be determined by the conduction state of the entire detection loop and the positive and negative test signal voltage provided by the positive and negative test signal terminal 41.

[0035] For example, the positive and negative test signal voltage can be positive, and a positive voltage difference is formed between the first fixture test pin 211 and the second fixture test pin 212. At this time, if the detection circuit is on, the positive and negative test signal terminal 41 can detect the conduction current, and it can be determined that the first fixture test pin 211 is connected to the first panel test pin 111 and the second fixture test pin 212 is connected to the second panel test pin 112. If the detection circuit is not on, the positive and negative test signal terminal 41 does not detect the conduction current, and it can be determined that the first fixture test pin 211 is connected to the second panel test pin 112 and the second fixture test pin 212 is connected to the first panel test pin 111. This allows for further determination of the forward and reverse connection status of the flexible circuit board. If the standard connection method, i.e., the forward connection status of the flexible circuit board, is that the first fixture test pin 211 is connected to the first panel test pin 111 and the second fixture test pin 212 is connected to the second panel test pin 112, and the detection circuit is conducting, and the forward and reverse connection test signal terminal 41 can detect the conduction current, then the flexible circuit board can be determined to be in the forward connection status. If the detection circuit is not conducting, and the forward and reverse connection test signal terminal 41 does not detect the conduction current, then the flexible circuit board can be determined to be in the reverse connection status.

[0036] Of course, the positive and negative test signal voltage can also be negative. In this case, if the detection circuit is on, the positive and negative test signal terminal 41 can detect the conduction current, and it can be determined that the first fixture test pin 211 is connected to the second panel test pin 112, and the second fixture test pin 212 is connected to the first panel test pin 111. If the detection circuit is not on, the positive and negative test signal terminal 41 does not detect the conduction current, and it can be determined that the first fixture test pin 211 is connected to the first panel test pin 111, and the second fixture test pin 212 is connected to the second panel test pin 112. This allows for further determination of the forward and reverse connection status of the flexible circuit board. If the standard connection method, i.e., the forward connection status of the flexible circuit board, is that the first fixture test pin 211 is connected to the first panel test pin 111 and the second fixture test pin 212 is connected to the second panel test pin 112, and the detection circuit is conducting, and the forward and reverse connection test signal terminal 41 can detect the conduction current, then the flexible circuit board can be determined to be in the forward connection status. If the detection circuit is not conducting, and the forward and reverse connection test signal terminal 41 does not detect the conduction current, then the flexible circuit board can be determined to be in the reverse connection status.

[0037] In summary, the embodiments of the present invention, through the corresponding structural design of the provided display module, test fixture board, and test video source, and their mutual cooperation during the testing phase, can obtain the conduction current based on the conduction state of the detection circuit, that is, the feedback signal received by the positive and negative test signal terminals of the test video source. During the display testing process of the display module, the insertion method of the flexible circuit board is automatically detected and accurately identified. This avoids the problem of misjudgment or damage caused by reverse insertion when manually inserting the flexible circuit board during the testing phase, helps to correct the insertion method of the flexible circuit board in a timely manner, conducts effective module testing, and helps to improve the production efficiency and yield of the product.

[0038] It should be further noted that, in this embodiment of the invention, the two panel test pins in the display module and the two fixture test pins in the fixture board need to be connected correspondingly via the flexible circuit board 30. Furthermore, the connection must be maintained even when the flexible circuit board 30 is in a reverse connection state, based on the swapped connection objects. Therefore, it can be understood that, in the pin arrangement direction, the two panel test pins must be symmetrical about the center line of the bonding pad 11, and the two fixture test pins must be symmetrical about the center line of the test pad 21. Based on meeting the above requirements, the specific positions of the two panel test pins and the two fixture test pins can be freely set, and no restrictions are imposed here. For example, as... Figure 1 and Figure 2 As shown, two panel test pins can be set at the two side edges of the bonding pad 11, and two fixture test pins can be set at the two side edges of the test pad 21.

[0039] In one specific embodiment, optionally, the first fixture test pin 211 is used to connect to the first panel test pin 111 via the flexible circuit board 30, and the second fixture test pin 212 is used to connect to the second panel test pin 112 via the flexible circuit board 30. The test video source 40 is configured to: provide a positive voltage from the positive / reverse connection test signal terminal 41; determine that the flexible circuit board 30 is in a positive connection state when there is a conducting current at the positive / reverse connection test signal terminal 41; and determine that the flexible circuit board 30 is in a reverse connection state when there is no conducting current at the positive / reverse connection test signal terminal 41.

[0040] In this embodiment, the standard connection method of the flexible circuit board 30, i.e., the orthogonal connection state, specifies that the first fixture test pin 211 is connected to the first panel test pin 111, and the second fixture test pin 212 is connected to the second panel test pin 112. Based on this, since the orthogonal connection test signal terminal 41 provides a positive voltage, when the orthogonal connection test signal terminal 41 receives a conducting current, it indicates that the entire detection circuit is conducting, i.e., the first fixture test pin 211 is connected to the first panel test pin 111, and the second fixture test pin 212 is connected to the second panel test pin 112. Therefore, it can be determined that the current connection state of the flexible circuit board 30 is the orthogonal connection state. Conversely, when no conducting current is received, it indicates that the detection circuit is not conducting, i.e., the first fixture test pin 211 is connected to the second panel test pin 112, and the second fixture test pin 212 is connected to the first panel test pin 111. Therefore, it can be determined that the current connection state of the flexible circuit board 30 is the reverse connection state.

[0041] In another specific embodiment, optionally, the first fixture test pin 211 is used to connect to the second panel test pin 112 via the flexible circuit board 30, and the second fixture test pin 212 is used to connect to the first panel test pin 111 via the flexible circuit board 30. The test video source 40 is configured to: provide a positive voltage from the positive / reverse connection test signal terminal 41; determine that the flexible circuit board 30 is in a positive connection state when there is no conducting current at the positive / reverse connection test signal terminal 41; and determine that the flexible circuit board 30 is in a reverse connection state when there is conducting current at the positive / reverse connection test signal terminal 41.

[0042] In this embodiment, the standard connection method of the flexible circuit board 30, i.e., the positive connection state, specifies that the first fixture test pin 211 is connected to the second panel test pin 112, and the second fixture test pin 212 is connected to the first panel test pin 111. Based on this, since the positive / reverse connection test signal terminal 41 provides a positive voltage, when the positive / reverse connection test signal terminal 41 does not receive a conducting current, it indicates that the entire detection circuit is not conducting, i.e., the first fixture test pin 211 is connected to the second panel test pin 112, and the second fixture test pin 212 is connected to the first panel test pin 111. Therefore, it can be determined that the current connection state of the flexible circuit board 30 is the positive connection state. Conversely, when a conducting current is received, it indicates that the detection circuit is conducting, i.e., the first fixture test pin 211 is connected to the second panel test pin 112, and the second fixture test pin 212 is connected to the first panel test pin 111. Therefore, it can be determined that the current connection state of the flexible circuit board 30 is the reverse connection state.

[0043] Continue to refer to Figures 2-4 Optionally, the fixture board also includes a current-limiting resistor 23, one end of which is connected to the positive and negative test signal terminal 41 via a connector 22, and the other end is connected to the first fixture test pin 211.

[0044] Setting a current-limiting resistor 23 on the fixture board essentially means connecting the current-limiting resistor 23 in series in the detection circuit. The current-limiting resistor 23 can control the conduction current in the entire detection circuit, precisely controlling the conduction current in the detection circuit. This can provide a convenient conduction current to the test video source 40 while avoiding damage to the test video source 40 due to excessive conduction current, thus ensuring that the test video source 40 can effectively identify the conduction current.

[0045] Figure 5 This is a schematic diagram of the structure of a test fixture plate for another display module provided in an embodiment of the present invention. Figure 6 and Figure 7 for Figure 5 The diagram shown illustrates the test fixture board in both positive and reverse connection states during the display test. (Refer to...) Figures 5-7 In an optional embodiment, the test video source 40 includes N test signal output terminals 43, and the test pad 21 also includes N third fixture test pins 213 arranged in sequence. The N test signal output terminals 43 are connected to the N third fixture test pins 213 one by one through the connector 22; where N is a positive integer greater than or equal to 2.

[0046] The bonding pad 11 also includes N third panel drive pins 113 arranged in sequence. N third fixture test pins 213 are used to be electrically connected to the N third panel drive pins 113 one by one through the flexible circuit board 30, so that the test signal output terminal 43 can provide display test signals to the corresponding connected third panel drive pins 113.

[0047] The fixture board also includes N inverting circuits 24 arranged in sequence; each inverting circuit 24 includes a control terminal, and the test video source 40 also includes an inverting control signal terminal 42, which is connected to the inverting control signal terminal 42 via a connector 22; each inverting circuit 24 also includes an input terminal, a first output terminal, and a second output terminal; in the arrangement direction, the input terminal of the i-th inverting circuit 24 is electrically connected to the i-th test signal output terminal 43; the first output terminal of the i-th inverting circuit 24 is connected to the i-th third fixture test pin 213, and the second output terminal is connected to the Ni-th third fixture test pin 213.

[0048] The inverting circuit 24 is configured such that when the inverting control signal terminal 42 outputs a first-level voltage signal, the input terminal is connected to the first output terminal; and when the inverting control signal terminal 42 outputs a second-level voltage signal, the input terminal is connected to the second output terminal.

[0049] As mentioned earlier, the main function of the test fixture board 20 is to act as an interface conversion device, connecting the test video source 40 and the display module 10, and providing the test signals from the test video source 40 to the display module 10 for display testing. Specifically, the N test signal output terminals 43 in the test video source 40 are responsible for connecting to the N third panel drive pins 113 in the display module 10 through the N third fixture test pins 213 on the test fixture board 20, respectively, to provide various drive signals to the display module 10, enabling the display module 10 to perform display functions, thereby detecting whether there are display problems. However, because the flexible circuit board 30 can be connected in both positive and negative directions, the third fixture test pins 213 on the test fixture board 20 and the third panel drive pins 113 on the display module 10 may not be correctly connected one-to-one, and the display test signals from the test video source 40 may not be received correctly. Based on this, in addition to the structure for detecting the positive and negative connection status of the flexible circuit board 30 in the test fixture board 20 and the display module 10, the present invention also adds a reversing circuit 24.

[0050] In this embodiment, the reversing circuit 24 is used to connect the test signal output terminal 43 of the test video source 40 to the corresponding correct third panel driving pin 113 through different third fixture test pins 213 in the standard connection state (positive connection state) and the incorrect connection state (reverse connection state), thereby providing the correct test signal to the third panel driving pin 113. In other words, it can be understood that since the third fixture test pin 213 connected to the third panel driving pin 113 is clearly known in the positive and reverse connection states of the flexible circuit board 30, the reversing circuit 24 can connect the test signal output terminal 43 of the test video source 40 to the third fixture test pin 213 connected to the third panel driving pin 113 in the positive connection state, and connect the test signal output terminal 43 of the test video source 40 to the third fixture test pin 213 connected to the third panel driving pin 113 in the reverse connection state, thereby reversing the connection relationship between the test signal output terminal 43 and the third fixture test pin 213.

[0051] Specifically, when the flexible circuit board 30 is in the forward connection state, the i-th third fixture test pin 213 is connected to the i-th third panel drive pin 113 through the flexible circuit board 30. In this case, the inverting circuit 24 needs to connect the i-th test signal output terminal 43 to the i-th third fixture test pin 213. When the flexible circuit board 30 is in the reverse connection state, the Ni-th third fixture test pin 213 is connected to the i-th third panel drive pin 113 through the flexible circuit board 30. In this case, the inverting circuit 24 needs to connect the i-th test signal output terminal 43 to the Ni-th third fixture test pin 213. Therefore, the input terminal of the i-th inverting circuit 24 needs to be connected to the i-th test signal output terminal 43, and the two output terminals need to be connected to the i-th and Ni-th third fixture test pins 213 respectively. Meanwhile, to achieve the switching of the connection state between the input terminal and the two output terminals of the inversion circuit 24, its control terminal can be connected to the inversion control signal terminal 42 of the test video source 40. Since the test video source 40 can determine the positive and negative connection state of the flexible circuit board 30 by receiving the conduction current from the positive and negative connection test signal terminal 41, it can provide a control signal to the inversion circuit 24 through the inversion control signal terminal 42 to switch the connection state between its input terminal and the two output terminals, thereby achieving automatic inversion operation. Thus, when the flexible circuit board 30 is reversed due to misoperation, it can automatically identify and reverse the connection between the inversion circuit 24 and the test pad 21 in the fixture board, achieving the effect of "negative negative equals positive". In this way, the correct test signal can still be provided to the third panel drive pin 113 of the display module 10 through the fixture board and the flexible circuit board 30, and effective display testing can be performed. This not only avoids the problem of misjudgment and damage caused by reverse connection, but also greatly saves the process of manual inspection and correction of the insertion method, and improves testing and production efficiency.

[0052] Figure 8 This is a schematic diagram of the structure of a test fixture plate for a display module provided in another embodiment of the present invention, for reference. Figures 5-8 Optionally, the inverting circuit 24 includes a first switch 241 and a second switch 242; the control terminal of the first switch 241 and the control terminal of the second switch 242 are connected and, as the control terminal of the inverting circuit 24, are connected to the inverting control signal terminal 42. In the arrangement direction, the first terminal of the first switch 241 and the first terminal of the second switch 242 in the i-th inverting circuit 24 are connected and, as the input terminal of the inverting circuit 24, are electrically connected to the i-th test signal output terminal 43; the second terminal of the first switch 241 in the i-th inverting circuit 24 is connected as the first output terminal to the i-th third fixture test pin 213, and the second terminal of the second switch 242 in the i-th inverting circuit 24 is connected as the second output terminal to the Ni-th third fixture test pin 213; where i is a positive integer from 1 to N.

[0053] The first switch 241 is configured to be turned on when the inversion control signal terminal 42 outputs a first-level voltage signal and turned off when the inversion control signal terminal 42 outputs a second-level voltage signal; the second switch 242 is configured to be turned off when the inversion control signal terminal 42 outputs a first-level voltage signal and turned on when the inversion control signal terminal 42 outputs a second-level voltage signal.

[0054] In this embodiment, the first switch 241 can specifically be an N-channel transistor, such as an NMOS transistor, and the second switch 242 can specifically be a P-channel transistor, such as a PMOS transistor. The gates of the two MOS transistors are interconnected and receive the same level voltage signal output from the inverting control signal terminal 42. The first level voltage signal can specifically be a high level voltage signal, and the second level voltage signal can specifically be a low level voltage signal. Therefore, by setting the inversion control signal terminal 42 to output a first-level voltage signal (i.e., a high-level signal) when the flexible circuit board 30 is in the positive connection state, the NMOS transistor (i.e., the first switch 241) can be turned on, while the PMOS transistor (i.e., the second switch 242) can be turned off. At this time, the first switch 241 can be used to connect the i-th test signal output terminal 43 (the first one in the example in the figure) to the i-th third fixture test pin 213 (the first one in the example in the figure). Since the flexible circuit board 30 is in the positive connection state, the i-th third fixture test pin 213 is connected to the i-th third panel drive pin 113 (the first one in the example in the figure). Therefore, the test signal output by the i-th test signal output terminal 43 can be correctly provided to the i-th third panel drive pin 113. Conversely, by setting the inversion control signal terminal 42 to output a second-level voltage signal (i.e., a low-level signal) when the flexible circuit board 30 is in the reverse connection state, the PMOS transistor (i.e., the second switch 242) can be turned on, while the NMOS transistor (i.e., the first switch 241) is turned off. At this time, the i-th test signal output terminal 43 (the first one in the example in the figure) can be connected to the Ni-th third fixture test pin 213 (the last one in the example in the figure) through the second switch 242. Since the flexible circuit board 30 is in the reverse connection state, the Ni-th third fixture test pin 213 is connected to the i-th third panel drive pin 113 (the first one in the example in the figure). Therefore, the test signal output by the i-th test signal output terminal 43 can be correctly provided to the i-th third panel drive pin 113.

[0055] Figure 9 This is a schematic diagram of the structure of a test fixture plate for another display module provided in an embodiment of the present invention. Figure 10 and Figure 11 for Figure 9 The diagram shown illustrates the test fixture board in both positive and reverse connection states during the display test. (Refer to...) Figures 9-11In another optional embodiment, the test video source 40 includes N test signal output terminals 43, and the test pad 21 also includes N third fixture test pins 213 arranged in sequence. The N test signal output terminals 43 are connected one-to-one with the N third fixture test pins 213 through connector 22; where N is a positive integer greater than or equal to 2.

[0056] The bonding pad 11 also includes N third panel drive pins 113 arranged in sequence. N third fixture test pins 213 are used to be electrically connected to the N third panel drive pins 113 one by one through the flexible circuit board 30, so that the test signal output terminal 43 can provide display test signals to the corresponding connected third panel drive pins 113.

[0057] The fixture board also includes N inverting circuits 24 arranged in sequence; each inverting circuit 24 includes a control terminal, and the test video source 40 also includes an inverting control signal terminal 42, which is connected to the inverting control signal terminal 42 via a connector 22; each inverting circuit 24 also includes a first input terminal, a second input terminal, and an output terminal; in the arrangement direction, the first input terminal of the i-th inverting circuit 24 is connected to the i-th test signal output terminal 43, and the second input terminal is connected to the Ni-th test signal output terminal 43; the output terminal of the i-th inverting circuit 24 is electrically connected to the i-th third fixture test pin 213.

[0058] The inverting circuit 24 is configured such that when the inverting control signal terminal 42 outputs a first-level voltage signal, the first input terminal and the output terminal are connected; when the inverting control signal terminal 42 outputs a second-level voltage signal, the second input terminal and the output terminal are connected.

[0059] This embodiment and Figure 5 The illustrated embodiment shows two parallel schemes of the inverting circuit 24. This embodiment is similar to... Figure 5 The difference in the illustrated embodiment is that, Figure 5 In the illustrated embodiment, the inverting circuit 24 has two output terminals, which are respectively connected to two different third fixture test pins 213. The inverting control signal output by the inverting control signal terminal 42 switches the third fixture test pins 213 connected to the inverting circuit 24. In this embodiment, the inverting circuit 24 has two input terminals, which are respectively connected to the test signal terminals of two different test video sources 40. The inverting control signal output by the inverting control signal terminal 42 switches the test signal terminals connected to the inverting circuit 24.

[0060] Specifically, the two input terminals of the i-th inverting circuit 24 need to be connected to the i-th and Ni-th test signal output terminals 43 respectively, and the output terminal needs to be connected to the i-th third fixture test pin 213. When the flexible circuit board 30 is in the forward connection state, the i-th third fixture test pin 213 is connected to the i-th third panel drive pin 113 through the flexible circuit board 30. At this time, the inverting circuit 24 needs to connect the i-th test signal output terminal 43 to the i-th third fixture test pin 213. When the flexible circuit board 30 is in the reverse connection state, the i-th third fixture test pin 213 is connected to the Ni-th third panel drive pin 113 through the flexible circuit board 30. At this time, the inverting circuit 24 needs to connect the Ni-th test signal output terminal 43 to the i-th third fixture test pin 213. Meanwhile, to achieve the switching of the connection state of the two input terminals and one output terminal of the inversion circuit 24, its control terminal can be connected to the inversion control signal terminal 42 of the test video source 40. Since the test video source 40 can determine the positive and negative connection state of the flexible circuit board 30 by receiving the conduction current from the positive and negative connection test signal terminal 41, it can provide a control signal to the inversion circuit 24 through the inversion control signal terminal 42 to switch the connection state of its two input terminals and one output terminal, thereby achieving automatic inversion operation. Thus, when the flexible circuit board 30 is reversed due to misoperation, it can automatically identify and reverse the connection of the test video source 40 and the inversion circuit 24 in the test fixture board 20, achieving the effect of "negative negative equals positive". In this way, the correct test signal can still be provided to the third panel drive pin 113 of the display module 10 through the fixture board and the flexible circuit board 30, and effective display testing can be performed. This not only avoids the problem of misjudgment and damage caused by reverse connection, but also greatly saves the process of manual inspection and correction of the insertion method, and improves testing and production efficiency.

[0061] Figure 12 This is a schematic diagram of the structure of a test fixture plate for a display module provided in another embodiment of the present invention, for reference. Figures 9-12 Optionally, the inverting circuit 24 includes a first switch 241 and a second switch 242; the control terminal of the first switch 241 and the control terminal of the second switch 242 are connected and, as the control terminal of the inverting circuit 24, are connected to the inverting control signal terminal 42. In the arrangement direction, the first terminal of the first switch 241 in the i-th inverting circuit 24 is connected as the first input terminal to the i-th test signal output terminal 43, the first terminal of the second switch 242 in the i-th inverting circuit 24 is connected as the second input terminal to the Ni-th test signal output terminal 43, and the second terminal of the first switch 241 and the second terminal of the second switch 242 in the i-th inverting circuit 24 are connected and, as the output terminal, are connected to the i-th third fixture test pin 213; where i is a positive integer from 1 to N.

[0062] The first switch 241 is configured to be turned on when the inversion control signal terminal 42 outputs a first-level voltage signal and turned off when the inversion control signal terminal 42 outputs a second-level voltage signal; the second switch 242 is configured to be turned off when the inversion control signal terminal 42 outputs a first-level voltage signal and turned on when the inversion control signal terminal 42 outputs a second-level voltage signal.

[0063] In this embodiment, the first switch 241 can specifically be an N-channel transistor, such as an NMOS transistor, and the second switch 242 can specifically be a P-channel transistor, such as a PMOS transistor. The gates of the two MOS transistors are interconnected and receive the same level voltage signal output from the inverting control signal terminal 42. The first level voltage signal can specifically be a high level voltage signal, and the second level voltage signal can specifically be a low level voltage signal. Therefore, by setting the inversion control signal terminal 42 to output a first-level voltage signal (i.e., a high-level signal) when the flexible circuit board 30 is in the positive connection state, the NMOS transistor (i.e., the first switch 241) can be turned on, while the PMOS transistor (i.e., the second switch 242) can be turned off. At this time, the first switch 241 can be used to connect the i-th test signal output terminal 43 (the first one in the example in the figure) to the i-th third fixture test pin 213 (the first one in the example in the figure). Since the flexible circuit board 30 is in the positive connection state, the i-th third fixture test pin 213 is connected to the i-th third panel drive pin 113 (the first one in the example in the figure). Therefore, the test signal output by the i-th test signal output terminal 43 can be correctly provided to the i-th third panel drive pin 113. Conversely, by setting the inversion control signal terminal 42 to output a second-level voltage signal (i.e., a low-level signal) when the flexible circuit board 30 is in the reverse connection state, the PMOS transistor (i.e., the second switch 242) can be turned on, while the NMOS transistor (i.e., the first switch 241) is turned off. At this time, the Nith test signal output terminal 43 (the last one in the example in the figure) can be connected to the ith third fixture test pin 213 (the first one in the example in the figure) through the second switch 242. Since the flexible circuit board 30 is in the reverse connection state, the ith third fixture test pin 213 is connected to the Nith third panel drive pin 113 (the last one in the example in the figure). Therefore, the test signal output by the Nith test signal output terminal 43 can be correctly provided to the Nith third panel drive pin 113.

[0064] It should be noted that, as Figure 8 and Figure 12The transistor channel types exemplified by the two switches shown, and the corresponding voltage signal output from the inverting control signal terminal 42 of the test video source 40, are merely one embodiment of the present invention. Those skilled in the art may also choose to use a P-type channel transistor for the first switch 241 and an N-type channel transistor for the second switch 242. Correspondingly, a low-level voltage signal is output when the flexible circuit board 30 is connected in the positive direction, and a high-level voltage signal is output when the flexible circuit board 30 is connected in the reverse direction. Based on the same principle, when the flexible circuit board 30 is connected in the reverse direction, the signal output terminal of the test video source 40 is connected in the reverse direction to the test fixture board 20 to achieve the effect of "negative times negative equals positive". Any rational modifications to the above-mentioned inverting circuit 24 fall within the protection scope of the present invention.

[0065] Based on the above embodiment, optionally, in this embodiment of the invention, the test video source 40 can also be configured to: after determining that the flexible circuit board 30 is in the positive connection state, output a high-level voltage signal after a delay of 40~100ms by the inversion control signal terminal 42; and when determining that the flexible circuit board 30 is in the reverse connection state, output a low-level voltage signal after a delay of 40~100ms by the inversion control signal terminal 42.

[0066] In this embodiment, after detecting the connection status of the flexible circuit board 30, a control signal is provided to the inversion circuit 24 after a delay of 40-100ms, controlling the inversion circuit 24 to conduct. This allows for the establishment of a valid signal within the delay time, providing preparation time for the test video source 40 and ensuring that the test video source 40 can output a valid test signal. For example, the delay time can be set to 50ms.

[0067] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention, the scope of which is determined by the scope of the appended claims.

Claims

1. A test fixture board for a display module, characterized in that, The display module includes bonding pads and unidirectional diodes; the bonding pads are used to connect to one end of the flexible circuit board; the bonding pads include a first panel test pin and a second panel test pin; The first panel test pin is electrically connected to the positive terminal of the unidirectional conduction diode, and the second panel test pin is electrically connected to the negative terminal of the unidirectional conduction diode. The fixture board includes a connector and test pads; the connector is used to connect to a test video source; the test pads are used to connect to the other end of the flexible circuit board. The test video source includes a positive and negative test signal terminal, and the test pad includes a first fixture test pin and a second fixture test pin; the positive and negative test signal terminal is electrically connected to the first fixture test pin through the connector, and the second fixture test pin is grounded; when the bonding pad and the test pad are connected through a flexible circuit board, one of the first fixture test pin and the second fixture test pin is connected to the first panel test pin, and the other is connected to the second panel test pin; The test video source is configured as follows: When connecting the bonding pads and the test pads through the flexible circuit board, the positive and negative connection status of the flexible circuit board is determined based on the feedback signal received by the positive and negative connection test signal terminal.

2. The fixture plate according to claim 1, characterized in that, The first fixture test pin is used to connect to the first panel test pin through the flexible circuit board, and the second fixture test pin is used to connect to the second panel test pin through the flexible circuit board. The test video source is configured to: provide a positive voltage from the positive / reverse connection test signal terminal; determine that the flexible circuit board is in a positive connection state when there is a conducting current at the positive / reverse connection test signal terminal; determine that the flexible circuit board is in a reverse connection state when there is no conducting current at the positive / reverse connection test signal terminal; or... The first fixture test pin is used to connect to the second panel test pin through the flexible circuit board, and the second fixture test pin is used to connect to the first panel test pin through the flexible circuit board. The test video source is configured to provide a positive voltage from the positive and negative connection test signal terminals. When there is no conducting current at the positive and negative connection test signal terminals, the flexible circuit board is determined to be in the positive connection state; when there is conducting current at the positive and negative connection test signal terminals, the flexible circuit board is determined to be in the negative connection state.

3. The fixture plate according to claim 2, characterized in that, The test video source includes N test signal output terminals, and the test pads also include N third fixture test pins arranged in sequence. The N test signal output terminals are connected one-to-one with the N third fixture test pins through the connector; where N is a positive integer greater than or equal to 2. The bonding pads also include N third panel driving pins arranged in sequence. The N third fixture test pins are used to be electrically connected to the N third panel driving pins one by one through the flexible circuit board, so as to provide display test signals from the test signal output terminal to the corresponding connected third panel driving pins. The fixture board also includes N inverting circuits arranged in sequence; The inversion circuit includes a control terminal, and the test video source further includes an inversion control signal terminal. The control terminal is connected to the inversion control signal terminal through the connector. The inversion circuit further includes an input terminal, a first output terminal, and a second output terminal; in the arrangement direction, the input terminal of the i-th inversion circuit is electrically connected to the i-th test signal output terminal; the first output terminal of the i-th inversion circuit is connected to the i-th third fixture test pin, and the second output terminal is connected to the Ni-th third fixture test pin; The inversion circuit is configured such that when the inversion control signal terminal outputs a first-level voltage signal, the input terminal is connected to the first output terminal; and when the inversion control signal terminal outputs a second-level voltage signal, the input terminal is connected to the second output terminal.

4. The fixture plate according to claim 3, characterized in that, The inverting circuit includes a first switch and a second switch; The control terminals of the first switch and the second switch are connected, and are also connected to the inverting control signal terminal as the control terminal of the inverting circuit; In the arrangement direction, the first terminal of the first switch and the first terminal of the second switch in the i-th inversion circuit are connected and electrically connected to the i-th test signal output terminal as the input terminal of the inversion circuit; the second terminal of the first switch in the i-th inversion circuit is connected to the i-th third fixture test pin as the first output terminal; the second terminal of the second switch in the i-th inversion circuit is connected to the Ni-th third fixture test pin as the second output terminal; where i is a positive integer from 1 to N; The first switch is configured to be turned on when the first level voltage signal is output at the inversion control signal terminal, and turned off when the second level voltage signal is output at the inversion control signal terminal; the second switch is configured to be turned off when the first level voltage signal is output at the inversion control signal terminal, and turned on when the second level voltage signal is output at the inversion control signal terminal.

5. The fixture plate according to claim 2, characterized in that, The test video source includes N test signal output terminals, and the test pads also include N third fixture test pins arranged in sequence. The N test signal output terminals are connected one-to-one with the N third fixture test pins through the connector; where N is a positive integer greater than or equal to 2. The bonding pads also include N third panel driving pins arranged in sequence. The N third fixture test pins are used to be electrically connected to the N third panel driving pins one by one through the flexible circuit board, so as to provide display test signals from the test signal output terminal to the corresponding connected third panel driving pins. The fixture board also includes N inverting circuits arranged in sequence; The inversion circuit includes a control terminal, and the test video source further includes an inversion control signal terminal. The control terminal is connected to the inversion control signal terminal through the connector. The inversion circuit further includes a first input terminal, a second input terminal, and an output terminal; in the arrangement direction, the first input terminal of the i-th inversion circuit is connected to the i-th test signal output terminal, and the second input terminal is connected to the Ni-th test signal output terminal; the output terminal of the i-th inversion circuit is electrically connected to the i-th third fixture test pin. The inversion circuit is configured such that when the inversion control signal terminal outputs a first-level voltage signal, the first input terminal is connected to the output terminal; and when the inversion control signal terminal outputs a second-level voltage signal, the second input terminal is connected to the output terminal.

6. The jig plate according to claim 5, characterized in that, The inverting circuit includes a first switch and a second switch; The control terminals of the first switch and the second switch are connected, and are also connected to the inverting control signal terminal as the control terminal of the inverting circuit; In the arrangement direction, the first terminal of the first switch in the i-th inversion circuit is connected as the first input terminal to the i-th test signal output terminal, the first terminal of the second switch in the i-th inversion circuit is connected as the second input terminal to the Ni-th test signal output terminal, and the second terminals of the first switch and the second switch in the i-th inversion circuit are connected and connected as the output terminal to the i-th third fixture test pin; where i is a positive integer from 1 to N; The first switch is configured to be turned on when the first level voltage signal is output at the inversion control signal terminal, and turned off when the second level voltage signal is output at the inversion control signal terminal; The second switch is configured to turn off when the first level voltage signal is output at the inversion control signal terminal, and to turn on when the second level voltage signal is output at the inversion control signal terminal.

7. The fixture plate according to claim 4 or 6, characterized in that, The test video source is also configured to: when the flexible circuit board is determined to be in the positive connection state, output a high-level voltage signal from the reverse control signal terminal; and when the flexible circuit board is determined to be in the reverse connection state, output a low-level voltage signal from the reverse control signal terminal. The first switch is an N-channel transistor, and the second switch is a P-channel transistor.

8. The fixture plate according to claim 7, characterized in that, The test video source is also configured as follows: After determining that the flexible circuit board is in the positive connection state, the high-level voltage signal is output after a delay of 40~100ms from the reverse control signal terminal; when determining that the flexible circuit board is in the reverse connection state, the low-level voltage signal is output after a delay of 40~100ms from the reverse control signal terminal.

9. The fixture plate according to claim 1, characterized in that, The fixture board also includes a current-limiting resistor, one end of which is connected to the positive and negative test signal terminal through the connector, and the other end is connected to the first fixture test pin.

10. A display module, characterized in that, It includes bonding pads and unidirectional diodes; the bonding pads are used to connect to one end of the flexible circuit board; the bonding pads include a first panel test pin and a second panel test pin. The first panel test pin is electrically connected to the positive terminal of the unidirectional conduction diode, and the second panel test pin is electrically connected to the negative terminal of the unidirectional conduction diode. The display module is used in conjunction with the test fixture board of the display module as described in any one of claims 1-9 for display testing.

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