Clamp key circuit for display screen test clamp

Abstract

The utility model discloses a clamp button circuit used for a display screen test clamp, comprising an input voltage end, the input voltage end is coupled with a first switch through a first resistor, and the input voltage end is coupled with a second switch through the first resistor and a second resistor. The input voltage end is coupled with the third switch through the first resistor, the second resistor and the third resistor, the input voltage end is coupled with the fourth switch through the first resistor, the second resistor, the third resistor and the fourth resistor, the input end of the first switch is coupled with the analog voltage end, and the output end of the second switch is coupled with the analog voltage end. And the output end of the fourth switch is coupled with the ground wire. The step arrangement of the voltage is realized in a mode of superposing the proportional resistors between the keys, which key is pressed down can be judged according to different voltage values at an analog voltage end, and the stability and the reliability are realized.

Description

Technical Field

[0001] The utility model relates to a display screen testing tool, more specifically, to a fixture key circuit for a display screen testing fixture. Background Art

[0002] When testing the display screen, a display screen test fixture is required. When the display screen test fixture uses the button function, each button is usually connected to the general pin port (GPIO for short) of the fixture main control chip. Figure 4 As shown, traditionally, each button will occupy the GPIO pin of the fixture main control chip. This circuit structure will occupy more GPIOs of the main control, squeezing out chip resources.

[0003] Chinese utility model patent document CN212110532U discloses a novel flexible display screen test fixture, comprising an anti-static support plate, an anti-static side baffle plate and an anti-static cross baffle plate. Anti-static side baffle plates are provided on both sides of the anti-static support plate. A flexible display screen is placed between the two anti-static support plates. The flexible display screen is limited by the anti-static cross baffle plate inserted into the U-shaped groove of the anti-static side baffle plate.

[0004] Obviously, this test fixture places the flexible display screen on the anti-static tray to facilitate the detection of the performance reliability of the flexible display screen, thereby improving work efficiency. However, this test fixture cannot solve the existing GPIO crowding problem. Utility Model Content

[0005] Based on this, it is necessary to provide a fixture key circuit for a display screen test fixture for the above technical problems. The fixture key circuit for the display screen test fixture includes an input voltage terminal, the input voltage terminal is coupled to the first switch through a first resistor, the input voltage terminal is coupled to the second switch through a first resistor and a second resistor, the input voltage terminal is coupled to the third switch through a first resistor, a second resistor, and a third resistor, the input voltage terminal is coupled to the fourth switch through a first resistor, a second resistor, a third resistor, and a fourth resistor, the input terminal of the first switch is coupled to the analog voltage terminal, and the output terminal of the fourth switch is coupled to the ground line. Since the analog voltage terminal is directly provided by the pin of the main control chip, only one port is needed to realize the recognition input of multiple keys, thereby saving GPIO resources. The step arrangement of voltage is realized by superimposing proportional resistors between each key. At the analog voltage terminal, it can be judged which key is pressed according to different voltage values, which is stable and reliable.

[0006] In order to solve the above technical problems, the utility model adopts the following technical solutions:

[0007] A fixture key circuit for a display screen test fixture, the fixture key circuit for the display screen test fixture comprising an input voltage end, the input voltage end is coupled to a first switch through a first resistor, the input voltage end is coupled to a second switch through a first resistor and a second resistor, the input voltage end is coupled to a third switch through a first resistor, a second resistor, and a third resistor, the input voltage end is coupled to a fourth switch through a first resistor, a second resistor, a third resistor, and a fourth resistor, the input end of the first switch is coupled to an analog voltage end, and the output end of the fourth switch is coupled to a ground line.

[0008] As a preferred implementation manner of the fixture key circuit for the display screen test fixture provided by the utility model, the resistance values ​​of the first resistor, the second resistor, the third resistor and the fourth resistor are 1000 ohms, 150 ohms, 240 ohms and 240 ohms respectively.

[0009] As a preferred implementation of the fixture key circuit for the display screen test fixture provided by the utility model, the input voltage end is 3.3V.

[0010] As a preferred implementation of the fixture key circuit for the display screen test fixture provided by the utility model, a first adjustment resistor is provided between the input terminal and the analog voltage terminal.

[0011] As a preferred implementation of the fixture key circuit for the display screen test fixture provided by the utility model, the first adjustment resistor is a potentiometer.

[0012] As a preferred implementation of the fixture key circuit for the display screen test fixture provided by the utility model, a second adjustment resistor is provided between the output end and the ground line.

[0013] As a preferred implementation of the fixture key circuit for the display screen test fixture provided by the utility model, the second adjustment resistor is a potentiometer.

[0014] As a preferred implementation mode of the fixture key circuit for the display screen test fixture provided by the utility model, a third adjustment resistor is provided between the first resistor and the input end, a fourth adjustment resistor is provided downstream of the first switch, a fifth adjustment resistor is provided downstream of the second switch, a sixth adjustment resistor is provided downstream of the third switch, and a seventh adjustment resistor is provided downstream of the fourth switch.

[0015] As a preferred implementation of the fixture key circuit for the display screen test fixture provided by the utility model, the fourth adjustment resistor, the fifth adjustment resistor, the sixth adjustment resistor and the seventh adjustment resistor are all potentiometers.

[0016] As a preferred implementation of the fixture key circuit for the display screen test fixture provided by the utility model, the first switch, the second switch, the third switch and the fourth switch are all four-pin key switches.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The utility model provides a fixture key circuit for a display screen test fixture. Since the analog voltage terminal is directly provided by the pin of the main control chip, only one port is needed to realize the recognition input of multiple keys, thereby saving GPIO resources. The voltage step arrangement is realized by superimposing proportional resistors between each key. At the analog voltage terminal, it can be determined which key is pressed according to different voltage values, which is stable and reliable.

[0019] In addition, a first regulating resistor may be provided between the input terminal and the analog voltage terminal. The first regulating resistor is a potentiometer. A second regulating resistor is provided between the output terminal and the ground wire. The second regulating resistor is a potentiometer. The voltage value obtained by the analog voltage terminal may be accurately regulated by using the first regulating resistor and the second regulating resistor, thereby accurately matching the resistance values ​​of the first resistor, the second resistor, the third resistor, and the fourth resistor, and further improving reliability.

[0020] In addition, a third regulating resistor may be provided between the first resistor and the input terminal, a fourth regulating resistor may be provided downstream of the first switch, a fifth regulating resistor may be provided downstream of the second switch, a sixth regulating resistor may be provided downstream of the third switch, and a seventh regulating resistor may be provided downstream of the fourth switch. The fourth regulating resistor, the fifth regulating resistor, the sixth regulating resistor and the seventh regulating resistor are all potentiometers. The first switch, the second switch, the third switch and the fourth switch are all four-pin key switches. The fourth regulating resistor, the fifth regulating resistor, the sixth regulating resistor and the seventh regulating resistor may be used to precisely adjust the resistance value on each key branch, so that the voltage value obtained by the analog voltage terminal may be precisely adjusted, and the resistance values ​​of the first resistor, the second resistor, the third resistor and the fourth resistor may be precisely matched, thereby further improving reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the scheme in the utility model, a brief introduction is given below to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is a schematic diagram of the connection structure of the fixture key circuit of the display screen test fixture of the utility model;

[0023] Figure 2 It is a three-dimensional structural schematic diagram of another embodiment of the fixture key circuit of the display screen test fixture of the utility model;

[0024] Figure 3 It is a three-dimensional structural schematic diagram of another embodiment of the fixture key circuit of the display screen test fixture of the utility model;

[0025] Figure 4 A schematic diagram of the connection structure of a fixture key circuit of an existing display screen test fixture;

[0026] The markings in the figure are as follows: ADC, analog voltage terminal; GND, ground wire; P2, output terminal; R1, first resistor; R2, second resistor; R3, third resistor; R4, fourth resistor; S1, first switch; S2, second switch; S3, third switch; S4, fourth switch; VDD, input voltage terminal; W1, first adjustment resistor; W2, second adjustment resistor; W3, third adjustment resistor; W4, fourth adjustment resistor; W5, fifth adjustment resistor; W6, sixth adjustment resistor; W7, seventh adjustment resistor. DETAILED DESCRIPTION

[0027] In order to enable those skilled in the art to better understand the solution of the utility model, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is only a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the utility model.

[0028] As described in the background technology, in the prior art, for a display screen test fixture, when the display screen test fixture uses a button function, each button is usually connected to the general purpose pin port (GPIO for short) of the fixture main control chip. Traditionally, each button will occupy the GPIO pin of the fixture main control chip. This circuit structure will occupy more GPIOs of the main control, squeezing out chip resources.

[0029] In order to solve this technical problem, the utility model provides a fixture key circuit for a display screen test fixture, including an input voltage terminal VDD, the input voltage terminal VDD is coupled to a first switch S1 through a first resistor R1, the input voltage terminal VDD is coupled to a second switch S2 through the first resistor R1 and the second resistor R2, the input voltage terminal VDD is coupled to a third switch S3 through the first resistor R1, the second resistor R2, and the third resistor R3, the input voltage terminal VDD is coupled to a fourth switch S4 through the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4, the input terminal P1 of the first switch S1 is coupled to an analog voltage terminal ADC, and the output terminal P2 of the fourth switch S4 is coupled to a ground line GND.

[0030] Through the above structural design, when the first switch S1 is pressed, the current of the input voltage terminal VDD passes through the first resistor R1 and flows into the ground line GND. When the second switch S2 is pressed, the current of the input voltage terminal VDD passes through the first resistor R1, the second resistor R2, and flows into the ground line GND. When the third button S3 is pressed, the current of the input voltage terminal VDD passes through the first resistor R1, the second resistor R2, and the third resistor R3, and flows into the ground line GND. When the fourth button S4 is pressed, the current of the input voltage terminal VDD passes through the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4, and flows into the ground line GND. Since the analog voltage terminal ADC is directly provided by the pin of the main control chip, only one IO port is required, which can realize the recognition input of multiple buttons, thereby saving GPIO resources. By superimposing proportional resistors between each button to achieve a step-by-step arrangement of voltage, at the analog voltage terminal ADC, it can be determined which button is pressed according to different voltage values, which is stable and reliable.

[0031] In order to enable those skilled in the art to better understand the present invention, the technical solutions in the embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, thereby making a clearer and more definite definition of the protection scope of the present invention.

[0032] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions in the embodiments may be combined with each other.

[0033] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0034] Example 1

[0035] like Figure 1As shown, the fixture key circuit for the display screen test fixture includes an input voltage terminal VDD, the input voltage terminal VDD is coupled to the first switch S1 through the first resistor R1, the input voltage terminal VDD is coupled to the second switch S2 through the first resistor R1 and the second resistor R2, the input voltage terminal VDD is coupled to the third switch S3 through the first resistor R1, the second resistor R2, and the third resistor R3, the input voltage terminal VDD is coupled to the fourth switch S4 through the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4, the input terminal P1 of the first switch S1 is coupled to the analog voltage terminal ADC, and the output terminal P2 of the fourth switch S4 is coupled to the ground line GND.

[0036] It should be noted that the resistance values ​​of the first resistor R1 , the second resistor R2 , the third resistor R3 and the fourth resistor R4 are 1000 ohms, 150 ohms, 240 ohms and 240 ohms respectively.

[0037] In addition, the input voltage terminal VDD is 3.3V.

[0038] The working mode of this embodiment is described below.

[0039] When the first switch S1 is pressed, the current of the input voltage terminal VDD passes through the first resistor R1 and flows into the ground line GND. When the second switch S2 is pressed, the current of the input voltage terminal VDD passes through the first resistor R1, the second resistor R2, and flows into the ground line GND. When the third button S3 is pressed, the current of the input voltage terminal VDD passes through the first resistor R1, the second resistor R2, the third resistor R3, and flows into the ground line GND. When the fourth button S4 is pressed, the current of the input voltage terminal VDD passes through the first resistor R1, the second resistor R2, the third resistor R3, the fourth resistor R4, and flows into the ground line GND.

[0040] Since the analog voltage ADC is directly provided by the pins of the main control chip, only one IO port is needed to realize the recognition and input of multiple keys, thus saving GPIO resources. By stacking proportional resistors between each key to achieve a step-by-step voltage arrangement, the analog voltage ADC can determine which key is pressed based on different voltage values, which is stable and reliable.

[0041] Example 2

[0042] like Figure 2 As shown, the fixture key circuit for the display screen test fixture provided in Example 1 is further optimized. Specifically, a first adjustment resistor W1 is provided between the input terminal P1 and the analog voltage terminal ADC. It should be noted that the first adjustment resistor W1 is a potentiometer.

[0043] In addition, a second regulating resistor W2 is provided between the output terminal P2 and the ground line GND. The second regulating resistor W2 is a potentiometer.

[0044] The working mode of this embodiment is described below.

[0045] The first adjustment resistor W1 and the second adjustment resistor W2 can be used to accurately adjust the voltage value obtained by the analog voltage terminal ADC, thereby accurately matching the resistance values ​​of the first resistor R1, the second resistor R2, the third resistor R3, and the fourth resistor R4, further improving reliability.

[0046] Example 3

[0047] like Figure 3 As shown, the fixture key circuit for the display screen test fixture provided in Example 1 or 2 is further optimized. Specifically, a third adjustment resistor W3 is provided between the first resistor R1 and the input terminal P1, a fourth adjustment resistor W4 is provided downstream of the first switch S1, a fifth adjustment resistor W5 is provided downstream of the second switch S2, a sixth adjustment resistor W6 is provided downstream of the third switch S3, and a seventh adjustment resistor W7 is provided downstream of the fourth switch S4.

[0048] The fourth regulating resistor W4 , the fifth regulating resistor W5 , the sixth regulating resistor W6 and the seventh regulating resistor W7 are all potentiometers.

[0049] The first switch S1, the second switch S2, the third switch S3 and the fourth switch S4 are all four-pin push-button switches.

[0050] The working mode of this embodiment is described below.

[0051] By using the fourth adjustment resistor W4, the fifth adjustment resistor W5, the sixth adjustment resistor W6 and the seventh adjustment resistor W7, the resistance value on each key branch can be precisely adjusted, so that the voltage value obtained by the analog voltage terminal ADC can be precisely adjusted, and the resistance values ​​of the first resistor R1, the second resistor R2, the third resistor R3 and the fourth resistor R4 can be precisely matched, thereby further improving reliability.

[0052] The terms "coupling" and "coupling" involved in the embodiments of the present application should be understood in a broad sense. For example, they may refer to a direct physical connection, or an indirect connection achieved through electronic devices, such as a connection achieved through resistors, inductors, capacitors or other electronic devices.

[0053] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] Obviously, the embodiments described above are only some embodiments of the present application, rather than all embodiments. The preferred embodiments of the present application are given in the accompanying drawings, but they do not limit the patent scope of the present application. The present application can be implemented in many different forms. On the contrary, the purpose of providing these embodiments is to make the understanding of the disclosure of the present application more thorough and comprehensive. Although the present application is described in detail with reference to the aforementioned embodiments, for those skilled in the art, it is still possible to modify the technical solutions recorded in the aforementioned specific implementation methods, or to replace some of the technical features therein with equivalents. Any equivalent structure made using the contents of the specification and drawings of this application, directly or indirectly used in other related technical fields, is similarly within the scope of patent protection of this application.

Claims

1. A fixture key circuit for a display screen test fixture, characterized in that: The fixture key circuit for the display screen test fixture comprises an input voltage terminal (VDD), the input voltage terminal (VDD) is coupled to a first switch (S1) through a first resistor (R1), the input voltage terminal (VDD) is coupled to a second switch (S2) through a first resistor (R1) and a second resistor (R2), the input voltage terminal (VDD) is coupled to a third switch (S3) through a first resistor (R1), a second resistor (R2) and a third resistor (R3), the input voltage terminal (VDD) is coupled to a fourth switch (S4) through a first resistor (R1), a second resistor (R2), a third resistor (R3) and a fourth resistor (R4), an input terminal (P1) of the first switch (S1) is coupled to an analog voltage terminal (ADC), and an output terminal (P2) of the fourth switch (S4) is coupled to a ground line (GND).

2. The fixture key circuit for a display screen test fixture according to claim 1, characterized in that: The resistance values ​​of the first resistor (R1), the second resistor (R2), the third resistor (R3) and the fourth resistor (R4) are 1000 ohms, 150 ohms, 240 ohms and 240 ohms respectively.

3. The fixture key circuit for a display screen test fixture according to claim 1, characterized in that: The input voltage terminal (VDD) is 3.3V.

4. The fixture key circuit for a display screen test fixture according to claim 1, characterized in that: A first regulating resistor (W1) is provided between the input terminal (P1) and the analog voltage terminal (ADC).

5. The fixture key circuit for a display screen test fixture according to claim 4, characterized in that: The first adjusting resistor (W1) is a potentiometer.

6. The fixture key circuit for a display screen test fixture according to claim 1, characterized in that: A second regulating resistor (W2) is provided between the output terminal (P2) and the ground line (GND).

7. The fixture key circuit for a display screen test fixture according to claim 6, characterized in that: The second adjusting resistor (W2) is a potentiometer.

8. The fixture key circuit for a display screen test fixture according to claim 1, characterized in that: A third regulating resistor (W3) is provided between the first resistor (R1) and the input terminal (P1), a fourth regulating resistor (W4) is provided downstream of the first switch (S1), a fifth regulating resistor (W5) is provided downstream of the second switch (S2), a sixth regulating resistor (W6) is provided downstream of the third switch (S3), and a seventh regulating resistor (W7) is provided downstream of the fourth switch (S4).

9. The fixture key circuit for a display screen test fixture according to claim 8, characterized in that: The fourth regulating resistor (W4), the fifth regulating resistor (W5), the sixth regulating resistor (W6) and the seventh regulating resistor (W7) are all potentiometers.

10. The fixture key circuit for a display screen test fixture according to claim 1, characterized in that: The first switch (S1), the second switch (S2), the third switch (S3) and the fourth switch (S4) are all four-pin push-button switches.

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