Display module discharging device and display module electrical testing system

Abstract

The utility model provides a display module discharge device and a display module electrical measurement system, the display module discharge device comprises a discharge module and a control module, the discharge module comprises an access end, a consumption resistor, a field effect transistor, a grounding end and a signal input port, the access end is connected with the consumption resistor, and the field effect transistor is connected with the control module. One end of the consumption resistor back to the access end is connected with a drain electrode of the field effect transistor, a source electrode of the field effect transistor is connected with a grounding end, a grid electrode of the field effect transistor is connected with the protection unit, one end of the protection unit back to the grid electrode is connected with a signal input port, one end of the protection unit connected with the grid electrode is connected with the pull-down resistor, and one end of the pull-down resistor back to the protection unit is connected with the source electrode. The signal input port is connected with the control module. By arranging the control module and the discharging module, residual charges on the display module enter the consumption resistor through the access end to be consumed, the discharging process is controlled through the electric signal, and manpower resources and time resources occupied in the electrical testing process of the display module are greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of display device production, and particularly relates to a display module discharging device and a display module electrical measurement system. Background Art

[0002] In the production process of existing display modules, there is an energization test process to test their electrical performance parameters and whether functions such as lighting and touch control are normal.

[0003] Some types of display modules include energy storage components such as capacitors and inductors. For example, in-vehicle display modules usually have a driving power supply designed on the display module, and its circuit board must include energy storage components. After the power-on function test, there will inevitably be charges remaining in the energy storage components.

[0004] The remaining charges in the energy storage components are likely to cause component failure or damage, and also easily affect the test process, having a negative impact on product quality and the yield rate. In the existing electrical measurement systems, there is a lack of a convenient and fast discharging device to accelerate the release of charges in the energy storage components. Summary of the Utility Model

[0005] Aiming at the deficiencies of the prior art, the purpose of the utility model is to provide a display module discharging device and a display module electrical measurement system, aiming to solve the problem that the residual charges in the energy storage components on the display module in the prior art are difficult to release quickly and conveniently.

[0006] To achieve the above purpose, the utility model is realized by the following technical solutions:

[0007] A display module discharging device includes a discharging module and a control module. The discharging module includes an access end, a consumption resistor, a field effect transistor, a grounding end, and a signal input port. The access end is connected to the consumption resistor. The end of the consumption resistor facing away from the access end is connected to the drain of the field effect transistor. The source of the field effect transistor is connected to the grounding end. The gate of the field effect transistor is connected to a protection unit. The end of the protection unit facing away from the gate is connected to the signal input port. The end of the protection unit connected to the gate is connected to a pull-down resistor. The end of the pull-down resistor facing away from the protection unit is connected to the source. The signal input port is connected to the control module, and the control module is connected to the power-on / off switch of the electrical measurement fixture.

[0008] Compared with the prior art, the beneficial effects of the present utility model are as follows: By providing the control module and the discharge module, an operator can send a high-level signal or a low-level signal to the signal input port in the discharge module through the control module, driving the loop of the field effect transistor in the discharge module to conduct, enabling the residual charge on the display module to enter the consumption resistor through the access terminal for consumption. The access method is simple and convenient, and by monitoring the power-on / off switch, the power-off operation during the electrical measurement process can be quickly responded to, and the discharge process is controlled by an electrical signal, greatly reducing the human resources and time resources occupied in the electrical measurement process of the display module. At the same time, it ensures that the electronic components on the display module are not damaged by residual charges.

[0009] Further, the control module includes a signal output unit and a control unit. The signal output unit is connected to the signal input port, and the signal output unit is used to output a high level or a low level. The control unit is connected to the signal output unit and the power-on / off switch.

[0010] Furthermore, the field effect transistor is an N-type field effect transistor.

[0011] Furthermore, the resistance value of the consumption resistor is 100 ohms.

[0012] Furthermore, the resistance value of the pull-down resistor is 10,000 ohms.

[0013] Furthermore, the resistance value of the protection unit is 2,000 ohms.

[0014] Still further, the duration of the high-level signal output by the signal output unit is greater than or equal to 100 ms.

[0015] A display module electrical measurement system includes a display module discharge device as described in the above technical solution. Description of the Drawings

[0016] Figure 1 It is a schematic structural diagram of the discharge module in the display module discharge device in the embodiment of the present utility model;

[0017] Figure 2 It is a schematic structural diagram of the display module discharge device in the embodiment of the present utility model;

[0018] Main Component Symbol Description:

[0019]

[0020]

[0021] The following specific embodiments will further illustrate the present utility model in conjunction with the above drawings. Specific Embodiments

[0022] To facilitate the understanding of the present utility model, the present utility model will be described more comprehensively below with reference to the relevant drawings. Several embodiments of the present utility model are shown in the drawings. However, the present utility model can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, these embodiments are provided to make the disclosure of the present utility model more thorough and comprehensive.

[0023] It should be noted that when an element is referred to as being "fixedly provided on" another element, it can be directly on the other element or there may also be an intermediate element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be an intermediate element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which the present utility model belongs. The terms used in the description of the present utility model herein are only for the purpose of describing specific embodiments and are not intended to limit the present utility model. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0025] Please refer to Figure 1 and Figure 2 , the display module discharging device in the embodiment of the present utility model includes a discharging module 100 and a control module 200. The discharging module 100 includes an access terminal 110, a consumption resistor 111, a field effect transistor 120, a grounding terminal and a signal input port 130. The field effect transistor 120 is an N-type field effect transistor. The resistance value of the consumption resistor 111 is 100 ohms. The access terminal 110 is connected to the consumption resistor 111. One end of the consumption resistor 111 facing away from the access terminal 110 is connected to the drain of the field effect transistor 120. The source of the field effect transistor 120 is connected to the grounding terminal 110. The gate of the field effect transistor 120 is connected to a protection unit 131. One end of the protection unit 131 facing away from the gate is connected to the signal input port 130. One end of the protection unit 131 connected to the gate is connected to a pull-down resistor 121. One end of the pull-down resistor 121 facing away from the protection unit 131 is connected to the source. The resistance value of the pull-down resistor 121 is 10,000 ohms. The resistance value of the protection unit 131 is 2,000 ohms. Preferably, the access terminal 110 is electrically connected to the power discharge point of the display module 300. The protection unit 131 uses a protection resistor with a resistance value of 2,000 ohms. Please refer to Figure 1Among them, for R2, the packages of the consumption resistor 111, the pull-down resistor 121, and the protection resistor all adopt the 0603 model, the resistor accuracy is 1%, the field effect transistor 120 functions as a switch, one end of the pull-down resistor 121 is connected to the gate of the field effect transistor 120, that is, the G pole, and the other end is connected to the source of the field effect transistor 120, that is, the S pole, which is equivalent to being connected to the ground terminal, that is, connected to the GND terminal. The pull-down resistor 121 plays a role in improving the stability of the field effect transistor 120, so that the field effect transistor 120 is in the off state by default. Even when the access terminal 110 is powered on, whether the field effect transistor 120 conducts only changes according to the MCU_IO signal of the signal input terminal 130. The N-type field effect transistor has the advantage of faster switching speed, which is convenient for improving the efficiency of the electrical measurement process of the display module 300.

[0026] The signal input port 130 is connected to the control module 200. The control module 200 is connected to the power-on / off switch of the electrical test fixture. The control module 200 includes a signal output unit 210 and a control unit 220. The signal output unit 210 is connected to the signal input port 130. The signal output unit 210 is used to output a high level or a low level. The duration of the high-level signal output by the signal output unit 210 is greater than or equal to 100 ms. The control unit 220 is connected to the signal output unit 210 and the power-on / off switch. Preferably, the discharge module 100 and the control module 200 are integrated inside the same housing. An external wiring terminal is provided on the housing to connect to the power discharge point of the display module 300 and connect to the access terminal 110. The modular external wiring helps prevent the access terminal 110 from being damaged due to a large number of plugging and unplugging operations during testing. The display module 300 is an in-vehicle display module, and a DC-DC power supply 310 is provided therein. Further, a program for monitoring and controlling the level of the MCU_IO signal is provided in the control unit 220. The control unit 220 is electrically connected to and monitors the power-on / off switch. During the lighting test, the access terminal 110 is electrically connected to the power discharge point. At this time, the VDD input of the discharge module 100 is the PG power input. The tester operates the control unit 220 to keep the MCU_IO signal at a low level, and the field effect transistor 120 is in the off state. When the lighting test is completed, a power-off operation is performed. The VDD input of the discharge module 100 is the residual charge input of the energy storage element. After the control unit 220 detects the power-off operation, it sets the level of the MCU_IO signal to high and maintains it for 100 ms, so that the access terminal 110 is connected to the ground terminal loop, and the residual charge is consumed through the consumption resistor 111. It can be understood that the display module discharge device can efficiently and conveniently complete the operation of removing the residual charge, ensuring that the electronic components on the display module 300 are not damaged by the residual charge, and ensuring the accuracy of the subsequent test process. And the protection unit 131 prevents the uncontrollable voltage feedback of the gate of the field effect transistor 120 from damaging the signal input port 130.

[0027] The present invention also provides a display module electrical test system, including the display module discharge device described in the above embodiment.

[0028] In the description of this specification, the description with reference to terms such as "one embodiment", "some embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present utility model. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0029] The above-described embodiments merely represent several implementation manners of the present utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the patent of the present utility model. 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 these all belong to the protection scope of the present utility model. Therefore, the protection scope of the patent of the present utility model shall be subject to the appended claims.

Claims

1. A discharge device for a display module, characterized in that, It includes a discharge module and a control module. The discharge module includes an access terminal, a consumption resistor, a field effect transistor, a ground terminal and a signal input port. The access terminal is connected to the consumption resistor. One end of the consumption resistor facing away from the access terminal is connected to the drain of the field effect transistor. The source of the field effect transistor is connected to the ground terminal. The gate of the field effect transistor is connected to a protection unit. One end of the protection unit facing away from the gate is connected to the signal input port. One end of the protection unit connected to the gate is connected to a pull-down resistor. One end of the pull-down resistor facing away from the protection unit is connected to the source. The signal input port is connected to the control module. The control module is connected to the power-on and power-off switch of the electrical measurement fixture.

2. The display module discharge device according to claim 1, wherein The control module includes a signal output unit and a control unit. The signal output unit is connected to the signal input port. The signal output unit is used to output a high level or a low level. The control unit is connected to the signal output unit and the power-on and power-off switch.

3. The display module discharge device according to claim 1, wherein, The field effect transistor is an N-type field effect transistor.

4. The display module discharge device according to claim 1, wherein, The resistance value of the consumption resistor is 100 ohms.

5. The display module discharge device according to claim 1, wherein, The resistance value of the pull-down resistor is 10,000 ohms.

6. The display module discharge device according to claim 1, characterized in that, The resistance value of the protection unit is 2,000 ohms.

7. The display module discharge device according to claim 2, wherein, The duration of the high-level signal output by the signal output unit is greater than or equal to 100 ms.

8. A display module electrical measurement system, characterized in that, It includes a display module discharge device according to any one of claims 1 to 7.

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