CN202494737U - Automatic test device for multipoint touch screen - Google Patents

Abstract

The utility model discloses an automatic test device for a multi-point touch screen. The multi-point touch screen includes a plurality of signal contacts distributed on each edge of a grid matrix and a plurality of touch screen leads corresponding to each of the signal contacts. The test device includes: a test adapter, one end of which includes a first pin corresponding to the plurality of touch screen pins, and the other end includes a plurality of second pins, and each of the first pins corresponds to A second pin; a test circuit, which includes several branch circuits, each of which includes first and second signal access points, and each of the signal access points corresponds to the first one of the test adapter respectively. Two pins, each branch circuit test whether the signal contacts opposite to each other are disconnected. Therefore, it is unnecessary to use expensive equipment, and it will not cause testing difficulties due to the inability to accurately touch the pins of the touch screen with the needle of a multimeter.

Description

Multi-touch screen automatic test device

【Technical field】

The utility model relates to an automatic test device, in particular to a multi-point touch screen automatic test device. the

【Background technique】

With the rapid development of science and technology, touch screen displays are more and more widely used in people's daily life, and are also more and more favored by people. At the same time, multi-touch screen technology is also very popular at the moment. the

For the realization of the multi-touch screen function, depending on the control of multiple pins (pins), it is necessary to check the status of each group during testing and analysis to confirm each group. Please refer to FIG. 1 and FIG. 2 together. FIG. 1 is a schematic structural diagram of a multi-point touch screen, and FIG. 2 is a comparison table of pins and signal contacts in FIG. 1 . It is necessary to test each row and each column of the grid matrix 11 divided by the multi-point touch screen 10 in FIG. Whether the group formed by a column is broken or normal. Taking the first column as an example, it is necessary to test whether the circuit formed by the YU01 signal contact 12 and the YD01 signal contact 12 is normal, and the corresponding pins are the 21st and 22nd pins. the

In production testing, expensive equipment such as line testing is usually required for verification; and in analysis, it is usually necessary to use a multimeter to confirm the grid matrix 11. Due to the dense pins, it is difficult to touch accurately. the

In view of this, it is necessary to develop a multi-touch screen automatic testing device to solve the above problems. the

【Content of invention】

Therefore, the purpose of this utility model is to provide a multi-point touch screen automatic testing device, thereby eliminating the need to use expensive equipment, and will not cause testing difficulties due to the inability to accurately touch the touch screen pins with the multimeter needle. the

In order to achieve the above purpose, the multi-point touch screen automatic test device provided by the utility model, the multi-point touch screen includes several signal contacts distributed on each edge of the grid matrix and a number of one-to-one corresponding to each of the signal contacts touch screen pins, the test setup includes:

A test adapter, one end of which includes a first pin corresponding to the plurality of touch screen pins, and the other end includes a plurality of second pins, and each of the first pins corresponds to a second pin;

The test circuit includes several branch circuits, each of which includes first and second signal access points, and each of the signal access points corresponds to the second pin of the test adapter one by one, each of which Whether the signal contacts opposite to the above branch circuit test position are disconnected. the

Optionally, the signal adapter is integrated with the test circuit. the

Optionally, the signal adapter and the test circuit are independent components. the

Optionally, the branch circuit further includes a judgment branch and a display branch; the input end of the judgment branch is the first and second signal access points, and the output end outputs an enabling signal; the display branch The path receives the enable signal and displays the test result. the

Optionally, the judging branch includes a power supply, a first resistor, a second resistor, a third resistor, and an N-MOS transistor; one end of the first resistor is connected to the power supply, and the other end of the first resistor is connected to the One end of the second resistor, the other end of the second resistor is grounded, the first resistor and the second resistor are connected to the first signal access point, and the second resistor and the ground are connected to the second Signal access point; one end of the third resistor is connected to the power supply, the other end of the third resistor is connected to the drain of the N-MOS transistor, and the gate of the N-MOS transistor is connected to the second Between the signal access point and the ground, the source of the N-MOS transistor is grounded. the

Optionally, the resistance of the first resistor is 1000 ohms, the resistance of the second resistor is 5000-10000 ohms, and the resistance of the third resistor is 1000 ohms;

Optionally, the display branch circuit includes a light-emitting diode and a fourth resistor, one end of the fourth resistor is connected to a power supply, the other end is connected to the anode of the light-emitting diode, and the cathode of the light-emitting diode is connected to the N-MOS transistor. drain. the

Optionally, the resistance of the fourth resistor is 100 ohms. the

Optionally, a fifth resistor is further connected between the second signal access point and the ground. the

Optionally, the fifth resistor has a resistance of 100,000 ohms. the

Compared with the prior art, utilizing the purpose multi-point touch screen automatic test device of the present utility model, since the test adapter is used to connect with the touch screen pins, the multi-point touch screen is automatically tested by the test circuit. Test and finally display the results. Therefore, it is unnecessary to use expensive equipment, and it will not cause testing difficulties due to the inability to accurately touch the pins of the touch screen with the needle of a multimeter. the

【Description of drawings】

FIG. 1 is a schematic structural diagram of a multi-point touch screen. the

FIG. 2 is a comparison table of pins and signal contacts in FIG. 1 . the

FIG. 3 is a block block diagram of the multi-point touch screen automatic testing device of the present invention. the

FIG. 4 is a schematic diagram of a branch circuit structure of a preferred embodiment of the multi-point touch screen automatic testing device of the present invention. the

【Detailed ways】

Please continue to refer to FIG. 1 and FIG. 2 , and refer to FIG. 3 together. FIG. 3 is a block diagram of a multi-touch screen automatic testing device of the present invention. the

In order to achieve the above object, the multi-point touch screen automatic test device provided by the utility model, the multi-point touch screen 10 includes a plurality of signal contacts 12 distributed on each edge of the grid matrix 11 and a One corresponding several touch-screen pins 14 (the several touch-screen pins 14 form the signal joint 13), the testing device 20 includes:

A test adapter 21, one end of which includes a first pin 22 corresponding to the plurality of touch screen pins 14, and the other end includes a plurality of second pins 23, and each of the first pins 22 corresponds to a first pin 22. Two pins 23;

Test circuit 24, which includes several branch circuits 25, each of which branch circuits 25 includes a first signal access point 26, a second signal access point 27, and each of the signal access points corresponds to the test switch one by one. For the second pin 23 of the joint 21, each branch circuit 25 tests whether the signal contacts 12 opposite to each other are disconnected. the

Wherein, the signal adapter 21 and the test circuit 24 are mutually independent components, so that the signal adapter 21 can be replaced conveniently according to the multi-touch screen 10 of different sizes, and then the test circuit 24 can be effectively Better versatility. Of course, the signal adapter 21 can also be integrated with the test circuit 24 . the

Wherein, the test circuit 24 includes 26, 30 or 35 branch circuits 25 (the number of branch circuits 25 depends on the signal contacts 12 to be tested for the multi-touch screen 10 of different sizes). the

Please continue to refer to FIG. 3 , and refer to FIG. 4 again. FIG. 4 is a schematic diagram of a branch circuit structure of a preferred embodiment of the multi-touch screen automatic testing device of the present invention. the

Wherein, the branch circuit 25 also includes a judgment branch 28 and a display branch 29; the input of the judgment branch 28 is the first signal access point 26 and the second signal access point 27, and the output terminal outputs enabling signal; the display branch 29 receives the enabling signal to display the test result. the

Wherein, the judging branch may include a power supply 30, a first resistor 31, a second resistor 32, a third resistor 33, and an N-MOS transistor 34; one end of the first resistor 31 is connected to the power supply 30, and the first The other end of the resistor 31 is connected to one end of the second resistor 32, the other end of the second resistor 32 is grounded, and the first signal access point 26 is connected between the first resistor 31 and the second resistor 33, so The second resistor 32 is indirectly connected to the second signal access point 27; one end of the third resistor 33 is connected to the power supply 30, and the other end of the third resistor 33 is connected to the N-MOS transistor 34 The drain, the gate of the N-MOS transistor 34 is connected between the second signal access point 27 and the ground, and the source of the N-MOS transistor 34 is grounded. the

Wherein, the resistance value of the first resistor 31 may be 1000 ohms, the resistance value of the second resistor 32 may be 5000-10000 ohms, and the resistance value of the third resistor 33 may be 1000 ohms. the

Wherein, the display branch 29 may also include a light emitting diode 35 and a fourth resistor 36, one end of the fourth resistor 36 is connected to the power supply 30, the other end is connected to the positive pole of the light emitting diode 35, and the negative pole of the light emitting diode 35 is connected to The drain of the N-MOS transistor 34 . the

Wherein, the resistance value of the fourth resistor 36 can be 100 ohms. the

During testing, the first signal access point 26 and the second signal access point 27 receive the touch signal generated by the signal contact 12. Taking YU01 and YD01 as examples, the first signal access point The entry point 26 corresponds to YU01, and the second signal entry point 27 corresponds to YD01. When there is a path between YU01 and YD01, the gate of the N-MOS transistor 34 is at a high level, the drain of the N-MOS transistor 34 outputs a low level, and the light emitting diode 35 is turned on and emits light. Therefore, when the light-emitting diode 35 emits light, the test result is the inter-bit path between the two signal contacts 12 in the corresponding position; when the light-emitting diode 35 does not emit light, the test result is the two signal contacts in the corresponding position. Contact 12 is open circuit. the

Wherein, the fifth resistor 37 (pull low resistor) can also be connected between the second signal access point 27 and the ground, so that the first signal access point 26 and the second signal access point 27 When there is a short circuit between them, the gate of the N-MOS transistor 34 is directly pulled to a low level to avoid drift. Wherein, the resistance value of the fifth resistor 37 can be one hundred thousand ohms. the

Compared with the prior art, utilizing the purpose multi-touch screen automatic test device of the present utility model, since the test adapter 21 is adopted to be connected with the touch screen pin 14, the test circuit 24 is used to test the multi-touch screen. The screen 10 performs automatic tests and finally displays the results. Therefore, it is not necessary to use expensive equipment, and it will not cause testing difficulties due to the inability to accurately touch the touch screen pin 14 with the needle of a multimeter. the

Claims (10)

1. A multi-point touch screen automatic testing device, the multi-point touch screen includes several signal contacts distributed on each edge of the grid matrix and some touch screen pins corresponding to each of the signal contacts one by one, It is characterized in that the testing device includes: A test adapter, one end of which includes a first pin corresponding to the plurality of touch screen pins, and the other end includes a plurality of second pins, each of the first pins corresponds to a second pin; The test circuit includes several branch circuits, each of which includes first and second signal access points, and each of the signal access points corresponds to the second pin of the test adapter one by one, each of which Whether the signal contacts opposite to the above branch circuit test position are disconnected. 2. The multi-touch screen automatic test device according to claim 1, wherein the signal adapter is integrated with the test circuit. 3. The multi-touch screen automatic test device according to claim 1, wherein the signal adapter and the test circuit are independent components. 4. multi-touch screen automatic testing device as claimed in claim 2 or 3, is characterized in that, described branch circuit also comprises judging branch and display branch; The input end of described judging branch is described first . The second signal access point, the output terminal outputs an enable signal; the display branch receives the enable signal and displays the test result. 5. multi-touch screen automatic testing device as claimed in claim 4, is characterized in that, described judging branch comprises power supply, first resistance, second resistance, the 3rd resistance, N-MOS tube; Said first One end of the resistor is connected to the power supply, the other end of the first resistor is connected to one end of the second resistor, the other end of the second resistor is grounded, and the first signal is connected between the first resistor and the second resistor. access point, the second resistor is indirectly connected to the second signal access point; one end of the third resistor is connected to the power supply, and the other end of the third resistor is connected to the drain of the N-MOS transistor pole, the gate of the N-MOS transistor is connected between the second signal access point and ground, and the source of the N-MOS transistor is grounded. 6. The multi-point touch screen automatic testing device according to claim 5, wherein the resistance value of the first resistance is 1000 ohms, the resistance value of the second resistance is 5000-10000 ohms, and the resistance value of the third resistance is The resistance is 1000 ohms. 7. The multi-touch screen automatic test device as claimed in claim 4, wherein the display branch circuit includes a light emitting diode and a fourth resistor, one end of the fourth resistor is connected to a power supply, and the other end is connected to the light emitting diode The anode of the light emitting diode is connected to the drain of the N-MOS transistor. 8. The multi-touch screen automatic testing device according to claim 7, wherein the resistance value of the fourth resistor is 100 ohms. 9. The multi-touch screen automatic testing device according to claim 5, wherein a fifth resistor is further connected between the second signal access point and ground. 10. multi-touch screen automatic testing device as claimed in claim 9, is characterized in that, described the 5th resistor resistance value is one hundred thousand ohms. the

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