Test fixture capable of controlling power-on and power-off time sequence
By installing an electromagnet on the test fixture and controlling its attachment using the circuit of the test base plate, the problem that existing test fixtures are prone to errors when controlling the up and down order of the display screen, achieving higher safety and reliability.
Patent Information
- Application Number
- CN202421362581.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-06-14
- Publication Date
- 2025-04-22
- Estimated Expiration
- 2034-06-14
AI Technical Summary
When controlling the power-up and down sequence of the existing test fixtures, errors are easily caused by negligence in operation, and the errors in the power-up and down sequence cannot be prevented.
A test fixture that can control the up-down power timing is designed. By installing the first electromagnet and the second electromagnet on the test fixture, and controlling the attachment of the electromagnets using the circuit and signals of the test base plate, the up-down power sequence of the VDD and VCC power switches is indirectly controlled.
Accurate control of the power-up and down sequence is achieved, errors caused by operational negligence are avoided, and the safety and reliability of the test process are improved.
Smart Images
Figure CN222785033U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of display screen testing, and in particular to a testing fixture capable of controlling power-on and power-off timings. Background Art
[0002] Display screens are widely used in today's society and can be seen everywhere. Through display screens, information can be expressed more intuitively and vividly. In the industrial and consumer fields, in addition to the products that generally use display screens, such as monitors, telephones, handheld scanners, cameras, etc., many previously unused devices are now also beginning to use display screens, such as remote controls, ovens, refrigerators, etc. Before the display screen module is shipped, it needs to pass 100% functional testing. Among them, PMOLED display screens and STN display screens require at least two external voltages to drive the display screen, of which the following two are required:
[0003] 1. VDD, used to drive the display driver IC, is usually 3.3V or 3.0V;
[0004] 2. VCC is used to drive glass display, PMOLED display is used to drive OLED, STN display is used to drive liquid crystal flip, VCC voltage is generally above 10V or close to 10V.
[0005] The power-on and power-off sequences of the above two voltages are controlled. When powering on, first turn on the low voltage, then the high voltage. When powering off, first turn off the high voltage, then the low voltage. For the control of this sequence, the current testing method is to control the power-on and power-off sequence by manually controlling the power switch. During the test process, negligence or carelessness in operation may cause problems such as power-on and power-off sequence errors, which cannot be prevented. Therefore, it is necessary to optimize this problem and provide a safe and reliable test fixture that can control the power-on and power-off sequence. Utility Model Content
[0006] Based on this, it is necessary to provide a test fixture that can control the power-on and power-off timing sequence to address the above technical problems. By setting the switch buttons of the VDD power switch and the VCC power switch to metal materials, the circuit and signal of the test baseboard are used to control the attraction of the first electromagnet and the second electromagnet, thereby indirectly controlling the power-on and power-off sequence of the VDD power switch and the VCC power switch, so as to achieve a fool-proof effect and avoid the problem of incorrect power-on and power-off sequence caused by negligent operation or carelessness.
[0007] In order to solve the above technical problems, the utility model adopts the following technical solutions:
[0008] A test fixture capable of controlling power-on and power-off timing, comprising:
[0009] A test fixture, a VDD power switch, a VCC power switch, a VDD power interface, and a VCC power interface. The test fixture is used to place a display screen. The VDD power switch and the VCC power switch are used to control the power on and off of the VDD power interface and the VCC power interface. The VDD power interface and the VCC power interface are used to connect to the display screen for testing;
[0010] A first electromagnet and a second electromagnet, wherein the first electromagnet and the second electromagnet are used to control the connection and disconnection of the switch buttons of the VDD power switch and the VCC power switch respectively;
[0011] The test base plate is used to first turn on the first electromagnet and then turn on the second electromagnet when power is turned on, and the test base plate is used to first turn off the second electromagnet and then turn off the first electromagnet when power is turned off.
[0012] Furthermore, the VDD power switch and the VCC power switch are installed on the left side of the upper surface of the test fixture, the first electromagnet and the second electromagnet are both installed inside the test fixture, the metal switch buttons of the VDD power switch and the VCC power switch correspond to the magnetic ends of the first electromagnet and the second electromagnet respectively, and the VDD power switch and the VCC power switch are both self-resetting switches.
[0013] Furthermore, a first port and a second port are provided on the left side of the test base plate, the first port is electrically connected to the first electromagnet through a first wire, and the second port is electrically connected to the second electromagnet through a second wire.
[0014] Furthermore, the test baseboard includes a power supply and a control unit, the power supply is used to provide a test voltage and an operating voltage of the first port and the second port, and the control unit is used to control power on and power off of the first port and the second port.
[0015] Furthermore, it also includes a main switch electrically connected to the power supply and the control unit, and the main switch is used to power on and off the control unit.
[0016] Furthermore, it also includes a judgment unit, a first current sensor and a second current sensor electrically connected to the power supply, the first current sensor is used to detect the current of the first wire, the second current sensor is used to detect the current of the second wire, and the judgment unit is used to transmit the signals of the first current sensor and the second current sensor to the control unit.
[0017] Furthermore, the opening or closing of the first electromagnet and the second electromagnet is delayed by 1-2 seconds.
[0018] Furthermore, the switch buttons of the VDD power switch and the VCC power switch are both made of metal.
[0019] Compared with the prior art, the utility model has the following beneficial effects:
[0020] The utility model provides a test fixture capable of controlling the power-on and power-off timing sequence. By setting the switch buttons of the VDD power switch and the VCC power switch to metal materials, and adding a first electromagnet and a second electromagnet to the test fixture, the circuit and signal of the test base plate are used to control the attraction of the first electromagnet and the second electromagnet, thereby indirectly controlling the power-on and power-off sequence of the VDD power switch and the VCC power switch, achieving a fool-proof effect, avoiding the problem of wrong power-on and power-off sequence caused by negligent operation or carelessness, and improving safety and reliability during use.
[0021] The utility model provides a test fixture capable of controlling the power-on and power-off timing. When the test base plate energizes the first electromagnet to generate magnetism and attracts the VDD power switch to close, if the first current sensor detects that there is current, the second electromagnet is energized to generate magnetism and attracts the VCC power switch to close. Then, when the test fixture is ready to power off, the test base plate first turns off the second electromagnet, the second electromagnet is not energized, the magnetism disappears, and the VCC power switch is disconnected. If the second current sensor detects that there is no current, the first electromagnet is turned off, the first electromagnet is not energized, the magnetism disappears, and the VDD power switch is disconnected, thereby more accurately controlling the first electromagnet and the second electromagnet to prevent errors in the power-on and power-off sequence. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] Figure 1 A schematic diagram of the structure of a test fixture that can control the power-on and power-off timing provided by the utility model;
[0023] Figure 2 A schematic diagram of the installation structure of the electromagnet of the test fixture capable of controlling the power-on and power-off timing provided by the utility model;
[0024] Figure 3 A schematic diagram of the structure of a control circuit of a test fixture capable of controlling the power-on and power-off timing provided by the utility model;
[0025] Figure 4 This is a schematic diagram of the structure of the current sensor installed in the test fixture capable of controlling the power-on and power-off timing provided by the utility model.
[0026] The markings in the figure are as follows:
[0027] 1. Test fixture; 2. VDD power switch; 3. VCC power switch; 4. VDD power interface; 5. VCC power interface; 6. First electromagnet; 7. Second electromagnet; 8. Test baseboard; 801. First port; 802. Second port; 803. First wire; 804. Second wire; 8011. Power supply; 8012. Control unit; 8013. Main switch; 8014. Judgment unit; 8015. First current sensor; 8016. Second current sensor. DETAILED DESCRIPTION
[0028] 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.
[0029] As described in the background art, in existing test fixtures, employees manually control the power on and off sequence by controlling the power switch. During the test process, negligence or carelessness in operation may cause the power on and off sequence to be incorrect, which cannot be prevented.
[0030] In order to solve this technical problem, the utility model provides a test fixture capable of controlling power-on and power-off timing, which is applied to perform power-on and power-off control on the test fixture.
[0031] Specifically, please refer to Figure 1-4 , the test fixtures that can control the power-on and power-off timing include:
[0032] Test fixture 1, VDD power switch 2, VCC power switch 3, VDD power interface 4 and VCC power interface 5. Test fixture 1 is used to place the display screen. VDD power switch 2 and VCC power switch 3 are used to control the power on and off of VDD power interface 4 and VCC power interface 5. VDD power interface 4 and VCC power interface 5 are used to connect to the display screen for testing.
[0033] The first electromagnet 6 and the second electromagnet 7, the switch buttons of the VDD power switch 2 and the VCC power switch 3 are all made of metal, and the first electromagnet 6 and the second electromagnet 7 are used to control the connection and disconnection of the switch buttons of the VDD power switch 2 and the VCC power switch 3 respectively;
[0034] The test base plate 8 is used to first turn on the first electromagnet 6 and then turn on the second electromagnet 7 when the power is turned on. The test base plate 8 is used to first turn off the second electromagnet 7 and then turn off the first electromagnet 6 when the power is turned off.
[0035] The utility model provides a test fixture capable of controlling the power-on and power-off timing sequence. By setting the switch buttons of the VDD power switch 2 and the VCC power switch 3 to be made of metal, and adding a first electromagnet 6 and a second electromagnet 7 to the test fixture 1, the circuit and signal of the test base plate 8 are used to control the attraction of the first electromagnet 6 and the second electromagnet 7, thereby indirectly controlling the power-on and power-off sequence of the VDD power switch 2 and the VCC power switch 3, so as to achieve a fool-proof effect, avoid the problem of wrong power-on and power-off sequence caused by negligent operation or carelessness, and improve the safety and reliability during use.
[0036] 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 accompanying drawings.
[0037] 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.
[0038] 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.
[0039] Please refer to Figure 1-3 A test fixture capable of controlling power-on and power-off timing, comprising a test fixture 1, a VDD power switch 2, a VCC power switch 3, a VDD power interface 4 and a VCC power interface 5, wherein the test fixture 1 is used to place a display screen, the VDD power switch 2 and the VCC power switch 3 are used to control power on and power off of the VDD power interface 4 and the VCC power interface 5, and the VDD power interface 4 and the VCC power interface 5 are used to connect to the display screen for testing;
[0040] The first electromagnet 6, the second electromagnet 7 and the test base plate 8, the switch buttons of the VDD power switch 2 and the VCC power switch 3 are all made of metal. The first electromagnet 6 and the second electromagnet 7 are respectively used to control the connection and disconnection of the switch buttons of the VDD power switch 2 and the VCC power switch 3. The test base plate 8 is used to first turn on the first electromagnet 6 and then turn on the second electromagnet 7 when power is turned on. The test base plate 8 is used to first turn off the second electromagnet 7 and then turn off the first electromagnet 6 when power is turned off.
[0041] Please refer to Figure 1 and Figure 2Through the electromagnetic induction phenomenon, when the first electromagnet 6 and the second electromagnet 7 are energized, magnetism will be generated. At this time, the test base plate 8 controls the energization of the first electromagnet 6 and the second electromagnet 7, and can control them to generate magnetism or not. When magnetism exists, the first electromagnet 6 and the second electromagnet 7 respectively attract the metal buttons of the VDD power switch 2 and the VCC power switch 3 to close them. When magnetism exists, the metal buttons of the VDD power switch 2 and the VCC power switch 3 are not attracted to make them in a released state, so that the circuit and signal of the test base plate 8 are used to control the attraction of the first electromagnet 6 and the second electromagnet 7, thereby indirectly controlling the power-on and power-off sequence of the VDD power switch 2 and the VCC power switch 3, so as to achieve a fool-proof effect.
[0042] The test fixture provided in this embodiment can control the power-on and power-off timing. When in use, before the test fixture 1 is powered on, the switches of the VDD power switch 2 and the VCC power switch 3 are both in the off state. After the test fixture 1 is powered on, the test base plate 8 first energizes the first electromagnet 6 to generate magnetism, attracting the VDD power switch 2 to close, and then energizes the second electromagnet 7 to generate magnetism, attracting the VCC power switch 3 to close. When the test fixture 1 is ready to be powered off, the test base plate 8 first turns off the second electromagnet 7, the second electromagnet 7 is not powered on, the magnetism disappears, the VCC power switch 3 is disconnected, and then turns off the first electromagnet 6, the first electromagnet 6 is not powered on, the magnetism disappears, and the VDD power switch 2 is disconnected.
[0043] The test fixture capable of controlling the power-on and power-off timing provided in Example 1 is further optimized. Specifically, Figure 1 and Figure 2 As shown, the VDD power switch 2 and the VCC power switch 3 are installed on the left side of the upper surface of the test fixture 1, the first electromagnet 6 and the second electromagnet 7 are both installed inside the test fixture 1, and the metal switch buttons of the VDD power switch 2 and the VCC power switch 3 correspond to the magnetic ends of the first electromagnet 6 and the second electromagnet 7 respectively, and the VDD power switch 2 and the VCC power switch 3 are both self-reset switches.
[0044] Through the above structural design, the magnetic ends of the first electromagnet 6 and the second electromagnet 7 can better attract the metal switch buttons of the VDD power switch 2 and the VCC power switch 3. When the first electromagnet 6 and the second electromagnet 7 are powered off, the VDD power switch 2 and the VCC power switch 3 reset themselves to achieve automatic disconnection.
[0045] The test fixture capable of controlling the power-on and power-off timing provided in Example 1 or 2 is further optimized, such as Figure 1 and Figure 2As shown, a first port 801 and a second port 802 are provided on the left side of the test base plate 8, the first port 801 is electrically connected to the first electromagnet 6 through a first wire 803, and the second port 802 is electrically connected to the second electromagnet 7 through a second wire 804, and the test base plate 8 includes a power supply 8011 and a control unit 8012, the power supply 8011 is used to provide a test voltage and an operating voltage of the first port 801 and the second port 802, and the control unit 8012 is used to control the power on and off of the first port 801 and the second port 802;
[0046] In this configuration, the control unit 8012 controls the power on and off of the first port 801 and the second port 802, thereby facilitating the control of the power on and off of the first electromagnet 6 and the second electromagnet 7, and making the wiring of the first port 801 and the second port 802 more convenient.
[0047] In this embodiment, in order to control the power on and off of the control unit 8012, a main switch 8013 electrically connected to the power supply 8011 and the control unit 8012 is also included, and the main switch 8013 is used to power on and off the control unit 8012;
[0048] In this way, the power supply 8011 is connected to the outside, and the test fixture 1 is powered after the main switch 8013 is pressed, so that the first electromagnet 6 and the second electromagnet 7 are powered on and off through the test base plate 8.
[0049] The test fixture capable of controlling the power-on and power-off timing provided in the above embodiments is further optimized, such as Figure 2 and 4 As shown, it also includes a judgment unit 8014, a first current sensor 8015 and a second current sensor 8016 electrically connected to the power supply 8011, the first current sensor 8015 is used to detect the current of the first wire 803, the second current sensor 8016 is used to detect the current of the second wire 804, and the judgment unit 8014 is used to transmit the signals of the first current sensor 8015 and the second current sensor 8016 to the control unit 8012;
[0050] With such a structural design, when the test base plate 8 energizes the first electromagnet 6 to generate magnetism and attracts the VDD power switch 2 to close, if the first current sensor 8015 detects that there is current, the second electromagnet 7 is energized to generate magnetism and attracts the VCC power switch 3 to close. Then, when the test fixture 1 is ready to power off, the test base plate 8 first turns off the second electromagnet 7, the second electromagnet 7 is not energized, the magnetism disappears, and the VCC power switch 3 is disconnected. If the second current sensor 8016 detects that there is no current, the first electromagnet 6 is turned off, the first electromagnet 6 is not energized, the magnetism disappears, and the VDD power switch 2 is disconnected, thereby performing more precise control over the first electromagnet 6 and the second electromagnet 7 to prevent errors in the power-on and power-off sequence.
[0051] The test fixture capable of controlling the power-on and power-off timing provided in the above-mentioned embodiments is further optimized, and the opening or closing delay of the first electromagnet 6 and the second electromagnet 7 is 1-2 seconds, which can also be appropriately increased or decreased according to the response time of the electromagnet;
[0052] Such a structural design reserves sufficient time for the closing of the first electromagnet 6 to ensure that the VCC power switch 3 is closed after the VDD power switch 2 is completely closed, which can better ensure the power-on and power-off sequence of the test fixture 1.
[0053] The use process of the test fixture capable of controlling the power-on and power-off timing provided by the utility model is as follows:
[0054] Due to the electromagnetic induction phenomenon, when the first electromagnet 6 and the second electromagnet 7 are energized, magnetism will be generated. At this time, the test base plate 8 controls the energization of the first electromagnet 6 and the second electromagnet 7, and can control them to generate magnetism or not. When magnetism is generated, the first electromagnet 6 and the second electromagnet 7 respectively attract the metal buttons of the VDD power switch 2 and the VCC power switch 3 to close them. When non-magnetism is generated, the metal buttons of the VDD power switch 2 and the VCC power switch 3 are not attracted to make them in a released state, so that the circuit and signal of the test base plate 8 are used to control the attraction of the first electromagnet 6 and the second electromagnet 7, thereby indirectly controlling the power-on and power-off sequence of the VDD power switch 2 and the VCC power switch 3, so as to achieve a fool-proof effect.
[0055] When in use, before the test fixture 1 is powered on, the switches of the VDD power switch 2 and the VCC power switch 3 are both in the off state. After the test fixture 1 is powered on, the test base plate 8 first energizes the first electromagnet 6 to generate magnetism, attracting the VDD power switch 2 to close, and then energizes the second electromagnet 7 to generate magnetism, attracting the VCC power switch 3 to close. When the test fixture 1 is ready to be powered off, the test base plate 8 first turns off the second electromagnet 7, the second electromagnet 7 is not powered on, the magnetism disappears, the VCC power switch 3 is disconnected, and then turns off the first electromagnet 6, the first electromagnet 6 is not powered on, the magnetism disappears, and the VDD power switch 2 is disconnected.
[0056] 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.
[0057] Obviously, the embodiments described above are only some embodiments of the utility model, rather than all embodiments. The preferred embodiments of the utility model are given in the accompanying drawings, but they do not limit the patent scope of the utility model. The utility model 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 utility model more thorough and comprehensive. Although the utility model 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 utility model specification and the accompanying drawings, directly or indirectly used in other related technical fields, is also within the scope of patent protection of the utility model.
Claims
1. A test fixture capable of controlling power-on and power-off timing, characterized in that: It includes: A test fixture (1), a VDD power switch (2), a VCC power switch (3), a VDD power interface (4) and a VCC power interface (5), wherein the test fixture (1) is used to place a display screen, the VDD power switch (2) and the VCC power switch (3) are used to control the power on and off of the VDD power interface (4) and the VCC power interface (5), and the VDD power interface (4) and the VCC power interface (5) are used to connect to the display screen for testing; A first electromagnet (6) and a second electromagnet (7), wherein the first electromagnet (6) and the second electromagnet (7) are used to control the connection and disconnection of switch buttons of a VDD power switch (2) and a VCC power switch (3) respectively; A test base plate (8), wherein the test base plate (8) is used to first turn on the first electromagnet (6) and then turn on the second electromagnet (7) when power is turned on, and the test base plate (8) is used to first turn off the second electromagnet (7) and then turn off the first electromagnet (6) when power is turned off.
2. The test fixture capable of controlling power-on and power-off timing according to claim 1, characterized in that: The VDD power switch (2) and the VCC power switch (3) are mounted on the left side of the upper surface of the test fixture (1); the first electromagnet (6) and the second electromagnet (7) are both mounted inside the test fixture (1); the metal switch buttons of the VDD power switch (2) and the VCC power switch (3) correspond to the magnetic ends of the first electromagnet (6) and the second electromagnet (7) respectively; and the VDD power switch (2) and the VCC power switch (3) are both self-resetting switches.
3. The test fixture capable of controlling power-on and power-off timing according to claim 1, characterized in that: A first port (801) and a second port (802) are provided on the left side of the test base plate (8); the first port (801) is electrically connected to the first electromagnet (6) via a first wire (803); and the second port (802) is electrically connected to the second electromagnet (7) via a second wire (804).
4. The test fixture capable of controlling power-on and power-off timing according to claim 3, characterized in that: The test base plate (8) comprises a power supply (8011) and a control unit (8012), wherein the power supply (8011) is used to provide a test voltage and an operating voltage of a first port (801) and a second port (802), and the control unit (8012) is used to control power on and power off of the first port (801) and the second port (802).
5. The test fixture capable of controlling power-on and power-off timing according to claim 4, characterized in that: It also includes a main switch (8013) electrically connected to the power supply (8011) and the control unit (8012), wherein the main switch (8013) is used to power on and off the control unit (8012).
6. The test fixture capable of controlling power-on and power-off timing according to claim 4, characterized in that: The invention also includes a judgment unit (8014) electrically connected to the power supply (8011), a first current sensor (8015) and a second current sensor (8016), wherein the first current sensor (8015) is used to detect the current of the first wire (803), and the second current sensor (8016) is used to detect the current of the second wire (804), and the judgment unit (8014) is used to transmit the signals of the first current sensor (8015) and the second current sensor (8016) to the control unit (8012).
7. The test fixture capable of controlling power-on and power-off timing according to claim 1, characterized in that: The opening or closing of the first electromagnet (6) and the second electromagnet (7) is delayed by 1-2 seconds.
8. The test fixture capable of controlling power-on and power-off timing according to claim 1, characterized in that: The switch buttons of the VDD power switch (2) and the VCC power switch (3) are both made of metal.