Display screen testing device

Abstract

The utility model relates to a display screen testing device. The display screen testing device provided by the utility model comprises a controller, a driving unit and a probe card, the output end of the controller is electrically connected with the input end of the driving unit, the output end of the driving unit is electrically connected with the input end of the probe card, and the output end of the probe card is electrically connected with the display screen; the controller is used for sending out a test signal, and the driving unit is used for driving the display screen to display the test signal. The display screen testing device provided by the utility model can improve the testing precision of the display screen, reduce the situation that bad display screens flow into a binding process, improve the production efficiency and reduce the production cost.

Description

Technical Field

[0001] The utility model relates to the technical field of display screens, in particular to a display screen testing device. Background Art

[0002] In the prior art, a display screen module includes a display screen and a driving IC. The display screen has a large number of pins. The pins on the display screen are connected to the driving IC through a bonding process to control the display of the display screen through the driving IC. In the actual production of display screen modules, the display screen needs to be tested before bonding the driving IC to screen out defective display screens and avoid waste of driving ICs caused by defective display screens flowing into the bonding process. In the past, the display screen was mainly tested by a testing machine. The testing machine is connected to the display screen through a probe card. The testing machine outputs different signals to drive different display screens to display, so as to achieve the purpose of screening out defective display screens. However, it is found in the actual production process that the display of the display screen after being tested by the testing machine is inconsistent with the display effect of the finished product after actually bonding the IC. As a result, after the defective display screens flow into the next process for bonding, a relatively high rejection rate still occurs, which will waste materials and labor and is not conducive to the control of production costs and the improvement of efficiency. Summary of the Utility Model

[0003] Based on this, the purpose of the utility model is to provide a display screen testing device, which is provided with a controller, a driving unit and a probe card. The controller sends out a test signal, and the test signal is transmitted to the display screen through the driving unit and the probe card to realize the testing of the display screen. Through this device, the accuracy of display screen testing can be improved, defective display screens can be prevented from flowing into the bonding process, and the production efficiency can be improved and the production cost can be reduced.

[0004] A display screen testing device for testing a display screen, comprising:

[0005] A controller, a driving unit and a probe card;

[0006] The output end of the controller is electrically connected to the input end of the driving unit, the output end of the driving unit is electrically connected to the input end of the probe card, and the output end of the probe card is electrically connected to the display screen; the controller is used for sending out a test signal, and the driving unit is used for driving the display screen to display the test signal.

[0007] Further, the driving unit includes an adapter board and a driving IC. The adapter board is provided with electrical connection lines, and the driving IC is mounted on the adapter board;

[0008] The input end of the driving IC is connected to the output end of the controller, the output end of the driving IC is connected to the input end of the electrical connection line, and the output end of the electrical connection line is connected to the input end of the probe card.

[0009] Further, the driving unit is also provided with a plurality of electrical connectors;

[0010] The input end of the driving IC is connected to the output end of the controller through the electrical connector, and the output end of the electrical connection line is connected to the input end of the probe card through the electrical connector.

[0011] Further, the driving unit includes an adapter board and a driving IC. The adapter board is provided with electrical connection lines, and the driving IC is arranged independently of the adapter board;

[0012] The input end of the driving IC is connected to the output end of the controller, the output end of the driving IC is connected to the input end of the electrical connection line, and the output end of the electrical connection line is connected to the input end of the probe card.

[0013] Further, the driving unit is also provided with a plurality of electrical connectors;

[0014] The input end of the driving IC is connected to the output end of the controller through the electrical connector, the output end of the driving IC is connected to the input end of the electrical connection line through the electrical connector, and the output end of the electrical connection line is connected to the input end of the probe card through the electrical connector.

[0015] Further, the cross-sectional dimension of the pins at the input end of the electrical connection line is smaller than that of the pins at the output end thereof;

[0016] The pins at the input end and the output end of the electrical connection line are equally spaced, and the spacing between adjacent pins at the input end of the electrical connection line is smaller than the spacing between adjacent pins at the output end of the electrical connection line.

[0017] Further, define the spacing between adjacent pins at the input end of the electrical connection line as d 1 , and the spacing between adjacent pins at the output end of the electrical connection line as d 2 , d 2 : d 1 ranges from 3 to 20.

[0018] Further, the adapter board is a glass PCB board, and the thickness range of the glass PCB board is: 0.4 - 1.1 mm.

[0019] Further, the electrical connectors are all made of zebra paper.

[0020] Further, a card pin is also provided between the probe card and the display screen, and the probe card and the display screen are connected through the card pin.

[0021] The beneficial effects of the present utility model are as follows:

[0022] (1) By setting a controller, a driving unit, and a probe card, the controller issues a test signal, and the test signal is transmitted to the display screen through the driving unit and the probe card to achieve the test of the display screen, thereby improving the accuracy of the display screen test, avoiding or reducing the inflow of defective display screens into the bonding process, improving production efficiency, and reducing production costs;

[0023] (2) A driving IC and an adapter board are arranged in the driving unit, so that the driving IC is connected to the probe card through the adapter board to solve the problem that the pins of the driving IC are too many and too thin to be directly connected to the input pins of the probe card.

[0024] (3) The adapter board uses a glass PCB board. The glass PCB board has a high flatness and can lithograph conductive lines with a line width of less than 50 microns, which is convenient for increasing the size of the lead wires and widening the spacing, thereby realizing the smooth connection between the thin pins of the driving IC and the probe card;

[0025] (4) Zebra paper is used as the electrical connector between components. By utilizing the soft and thin characteristics of the zebra paper, it can better contact the glass PCB board, and the connection effect between components is better, further improving the test accuracy; and it is inexpensive, which is beneficial to cost control. In addition, it is convenient for connection and disassembly, improving production and maintenance efficiency.

[0026] For better understanding and implementation, the present utility model will be described in detail below with reference to the accompanying drawings. Description of the Drawings

[0027] Figure 1 Schematic diagram of the connection structure between the display screen test device and the display screen provided by the embodiment of the present application;

[0028] Figure 2 Schematic diagram of the connection structure between the display screen test device and the display screen provided by another embodiment of the present application;

[0029] Figure 3 Schematic diagram of the adapter board and the electrical connection lines arranged on the adapter board provided by the embodiment of the present application;

[0030] Figure 4 Schematic diagram of the probe card structure provided by the embodiment of the present application;

[0031] Figure 5 For Figure 3 the enlarged view at A in

[0032] Figure 6 For Figure 3 the enlarged view at B in

[0033] Figure 7 Schematic diagram of the zebra paper structure provided by the embodiment of the present application.

[0034] In the figure: 10 - controller; 20 - driving unit; 21 - driving IC; 22 - adapter board; 221 - electrical connection line; 231 - first electrical connector; 232 - second electrical connector; 241 - third electrical connector; 242 - fourth connector; 243 - fifth connector; 30 - probe card; 31 - card pin. Specific embodiments

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0036] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "vertical direction", "upper", "lower", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, "first", "second", "third", "fourth" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance.

[0037] In the description of the present invention, it should also be noted that unless otherwise clearly defined and limited, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be a direct connection or a connection through an intermediate medium. It can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0038] Regarding the problem that the display screen is inaccurate after being tested by a tester in the prior art, through analysis, it is found that the driving ability of the actually bonded driving IC in the subsequent process is different from that of the tester, and for different models of display screens, the same tester is used, resulting in the same signal waveforms received by different models of display screens. In fact, for different models of display screens, there are differences in the signal waveforms output by the driving IC, which makes it difficult to detect some defective display screens. Even for some models with special driving signals, the tester cannot output the required driving signals, seriously affecting the control of the yield rate of the subsequent process.

[0039] Based on this, the present utility model provides a display screen testing device, which is provided with a controller, a driving unit and a probe card. The controller issues a test signal, and the test signal is transmitted to the display screen through the driving unit and the probe card to realize the testing of the display screen, thereby improving the accuracy of the display screen testing, avoiding or reducing the inflow of defective display screens into the bonding process, improving production efficiency and reducing production costs.

[0040] Please also refer to Figures 1 to 4 , an embodiment of the present application provides a display screen testing device for performing a display test on a display screen 1 before bonding a driving IC. It includes a controller 10, a driving unit 20 and a probe card 30. The output end of the controller 10 is electrically connected to the input end of the driving unit 20, the output end of the driving unit 20 is electrically connected to the input end of the probe card 30, and the output end of the probe card 30 is electrically connected to the display screen 1. The controller 10 is used to issue a test signal, and the driving unit 20 is used to drive the display screen 1 to display the test signal to determine whether the display of the display screen 1 is normal.

[0041] Specifically, the controller 10 is used to issue a corresponding test signal according to the model of the display screen 1 and control the driving unit 20 to drive the display screen 1 for testing. In this embodiment, the controller 10 is a single-chip microcomputer.

[0042] The driving unit 20 includes a driving IC 21 and an adapter board 22. In this embodiment, the driving IC 21 is a COG IC, and the driving IC 21 is mounted on the adapter board 22. At the same time, since the pins at the output end of the COG IC are thin and numerous and are relatively densely distributed, while the pins at the input end of the probe card 30 are relatively thick and are relatively sparsely distributed and have a wider layout, it is necessary to use the adapter board 22 to increase the size of the pins and widen the interval distribution between the pins to achieve a smooth connection between the output end of the driving IC 21 and the probe card 30.

[0043] Please also refer to Figure 5 and Figure 6 , specifically, on the adapter board 22, electrical connection lines 221 are made through yellow room exposure or etching process. The cross-sectional size of the input end pins of the electrical connection lines 221 is smaller than the cross-sectional size of their output end pins, and the spacing between the input end pins of the electrical connection lines 221 is smaller than the spacing between their output end pins. The input end of the electrical connection lines 221 is used to be electrically connected to the pins at the output end of the driving IC 21, and the output end is connected to the probe card 30. Preferably, the spacing between adjacent two pins at the input end of the electrical connection lines 221 is the same, and the spacing between adjacent two pins at the output end is the same. Define the spacing between adjacent two pins at the input end of the electrical connection lines 221 as d 1 , the spacing between adjacent two pins at the output end of the electrical connection lines 221 is d 2 , so d 2>d 1 , and d 2 : d 1 The value range of d is: 3 to 20. Preferably, the distance between adjacent two pins at the output end of the electrical connection line 221 is d 2 > 0.2 mm.

[0044] The number of pins of the COG IC is usually 100 to 300, and the pin diameter of the COG IC is 0.005 to 0.020 mm. Preferably, the adapter board 22 uses a glass PCB board. The glass PCB board has high flatness and can lithographically produce conductive lines with a line width of less than 50 microns. Therefore, it can be adapted to connections with fine and numerous pins and dense distributions such as COG ICs. In addition, the thickness of the glass PCB board should be appropriate. As an external adapter board, it cannot be made too thin, as it is easily damaged under long-term repeated use, and it cannot be made too thick, which is not conducive to cost control. Therefore, the thickness range of the glass PCB board is 0.4 to 1.1 mm, preferably 1.1 mm.

[0045] Furthermore, in order to realize the electrical connection between the driving IC 21 and the controller 10 and the probe card 30 respectively, the driving unit 20 is further provided with a plurality of electrical connectors. In this embodiment, the electrical connectors are specifically two, namely the first electrical connector 231 and the second electrical connector 232. The input end of the driving IC 21 is electrically connected to the output end of the controller 10 through the first electrical connector 231, and the output end of the driving IC 21 is electrically connected to the input end of the probe card 30 through the second electrical connector 232. Thus, the controller 10 sends a test signal, which is transmitted to the driving IC 21 through the first electrical connector 231. The driving signal sent by the driving IC 21 passes through the second electrical connector 232 and the probe card 30 in sequence, and finally reaches the display screen 1 to drive the display screen 1 to display information and test whether the display is normal.

[0046] In another embodiment, the driving IC 21 is a TAB IC. The TAB IC is formed by lithographing an IC on a film. Therefore, the TAB IC is an independent driving IC and does not need to be mounted on the adapter board 22. The adapter board 22 can be entirely used for arranging the electrical connection lines 221, which can reduce the size of the adapter board 22 and lower the cost of the testing device. The pin diameter of the TAB IC is 0.05 - 0.2 mm. Preferably, the adapter board 22 is made of a glass PCB board. Similarly, the cross-sectional size of the input pins of the electrical connection lines 221 is smaller than that of the output pins, and the spacing between the input pins of the electrical connection lines 221 is smaller than the spacing between the output pins. Preferably, the spacing between adjacent input pins of the electrical connection lines 221 is the same, and the spacing between adjacent output pins is the same. The driving unit 20 is further provided with a plurality of electrical connectors. In this embodiment, the electrical connectors are specifically three, namely the third electrical connector 241, the fourth connector 242, and the fifth connector 243. The output end of the driving IC 21 is connected to the input end of the electrical connection line 221 through the third electrical connector 241, the input end of the driving IC 21 is connected to the output end of the controller 10 through the fourth electrical connector 242, and the output end of the electrical connection line 221 is connected to the input end of the probe card 30 through the fifth electrical connector 243. Thus, through the electrical connection lines 221 arranged on the glass PCB, the electrical connection between the driving IC 21 and the probe card 30 can be successfully achieved.

[0047] Please refer to Figure 7 , preferably, a plurality of electrical connectors are all made of zebra paper, specifically the first electrical connector 231 and the second electrical connector 232, and the third electrical connector 241, the fourth electrical connector 242, and the fifth electrical connector 243 are all made of zebra paper. Zebra paper has the characteristics of being soft and thin. Utilizing its characteristics, it can better contact the glass PCB board, thereby improving the connectivity between components and further enhancing the accuracy of testing. At the same time, zebra paper can flexibly select the number of pins, facilitating the connection between components with various numbers of pins. In addition, zebra paper is inexpensive, which is conducive to cost control of the testing device, and can achieve connection and disassembly quickly and simply, facilitating the assembly, maintenance, or replacement of the testing device and improving the testing efficiency.

[0048] Furthermore, a card pin 31 is further provided between the probe card 30 and the display screen 1, and the probe card 30 and the display screen 1 are connected through the card pin 31.

[0049] In actual testing, for display screens of the same model, a corresponding driving IC can be selected, and multiple display screens can be tested. Therefore, using the display screen testing device of the present application has universality for display screens of the same model. One driving IC can achieve the testing of a large number of display screens, which is beneficial to cost control of testing while improving the accuracy of testing.

[0050] Compared with the prior art, the beneficial effects of the technical solution of the present application are as follows:

[0051] (1) By setting a controller, a driving unit and a probe card, the controller emits a test signal, and the test signal is transmitted to the display screen through the driving unit and the probe card to realize the test of the display screen, thereby improving the accuracy of the display screen test, avoiding or reducing the inflow of defective display screens into the bonding process, improving production efficiency and reducing production costs;

[0052] (2) A driving IC and an adapter board are arranged in the driving unit, and the driving IC is connected to the probe card through the adapter board to solve the problem that the pins of the driving IC are too many and too thin to be directly connected to the input pins of the probe card.

[0053] (3) The adapter board adopts a glass PCB board, which has a high flatness and can lithograph conductive lines with a line width of less than 50 microns, facilitating the increase of the pin wire size and the widening of the pitch, thereby realizing the smooth connection between the fine pins of the driving IC and the probe card;

[0054] (4) Anisotropic conductive film is used as the electrical connector between components. By utilizing the soft and thin characteristics of the anisotropic conductive film, it can better contact the glass PCB board, and the connection effect between components is better, further improving the test accuracy; moreover, it is inexpensive, which is beneficial to cost control. In addition, it is easy to connect and disassemble, improving production and maintenance efficiency.

[0055] The above embodiments only represent several implementation manners of the present utility model, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation on the scope of the utility model patent. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present utility model, several modifications and improvements can still be made, and the present utility model also intends to include these modifications and improvements.

Claims

1. A display screen testing device, used for testing a display screen, characterized in that: include: Controller, drive unit and probe card; The output end of the controller is electrically connected to the input end of the driving unit, the output end of the driving unit is electrically connected to the input end of the probe card, and the output end of the probe card is electrically connected to the display screen; the controller is used to send a test signal, and the driving unit is used to drive the display screen to display the test signal.

2. The display screen testing device according to claim 1, characterized in that: The driving unit includes an adapter board and a driving IC, the adapter board is provided with an electrical connection line, and the driving IC is mounted on the adapter board; The input end of the driving IC is connected to the output end of the controller, the output end of the driving IC is connected to the input end of the electrical connection line, and the output end of the electrical connection line is connected to the input end of the probe card.

3. The display screen testing device according to claim 2, characterized in that: The drive unit is also provided with a plurality of electrical connectors; The input end of the driving IC is connected to the output end of the controller through the electrical connection piece, and the output end of the electrical connection line is connected to the input end of the probe card through the electrical connection piece.

4. The display screen testing device according to claim 1, characterized in that: The driving unit includes an adapter board and a driving IC, the adapter board is provided with an electrical connection line, and the driving IC is independently arranged from the adapter board; The input end of the driving IC is connected to the output end of the controller, the output end of the driving IC is connected to the input end of the electrical connection line, and the output end of the electrical connection line is connected to the input end of the probe card.

5. The display screen testing device according to claim 4, characterized in that: The drive unit is also provided with a plurality of electrical connectors; The input end of the driver IC is connected to the output end of the controller through the electrical connector, the output end of the driver IC is connected to the input end of the electrical connection line through the electrical connector, and the output end of the electrical connection line is connected to the input end of the probe card through the electrical connector.

6. The display screen testing device according to claim 3 or 5, characterized in that: The cross-sectional dimension of the pin at the input end of the electrical connection line is smaller than the cross-sectional dimension of the pin at the output end; The pins at the input end and the output end of the electrical connection line are arranged at equal intervals, and the spacing between adjacent pins at the input end of the electrical connection line is smaller than the spacing between adjacent pins at the output end of the electrical connection line.

7. The display screen testing device according to claim 6, characterized in that: The spacing between adjacent pins at the input end of the electrical connection line is defined as d1, the spacing between adjacent pins at the output end of the electrical connection line is defined as d2, and the value range of d2:d1 is 3-20.

8. The display screen testing device according to claim 7, characterized in that: The adapter board is a glass PCB board, and the thickness of the glass PCB board ranges from 0.4 to 1.1 mm.

9. The display screen testing device according to claim 8, characterized in that: The electrical connectors are all made of zebra paper.

10. The display screen testing device according to claim 9, characterized in that: A card pin is also provided between the probe card and the display screen, and the probe card and the display screen are connected via the card pin.

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