CN204405990U - A kind of measurement jig of display panel - Google Patents

Abstract

The utility model provides a test fixture for a display panel. The test fixture is connected with the display panel for generating signals and voltages used for display panel testing, and includes a first switch for controlling the input of a total power supply and a power supply module. . A signal conversion module, a control module and a second switch for outputting test signals to the display panel. Wherein, the power supply module is connected to the first switch; the signal conversion module is connected to the power supply module; the control module is connected to the voltage enabling terminal of the power supply module and the signal enabling terminal of the signal conversion module The terminal is connected; the second switch is connected with the control module. The test fixture of the display panel provided by the utility model controls the level of the signal enable terminal and the voltage enable terminal through the control module, and then controls the output of the signal conversion module and the power supply module, so that the display panel can be continuously powered during the test process. Plugging and unplugging saves time and reduces costs.

Description

A test fixture for a display panel

technical field

The utility model relates to the technical field of testing, in particular to a testing fixture for a display panel.

Background technique

Liquid crystal display (Liquid Crystal Display, LCD) has many advantages such as light and thin, energy saving, no radiation, etc., so it has gradually replaced the traditional cathode ray tube (CRT) display. Currently, liquid crystal displays are widely used in high-definition digital televisions, desktop computers, personal digital assistants (PDAs), notebook computers, mobile phones, digital cameras and other electronic devices.

The liquid crystal display device includes a liquid crystal display panel (Liquid Crystal Panel) and a backlight module (Back Light Module). Among them, the liquid crystal display panel is mainly formed by combining a thin film transistor substrate (also called an Array substrate) with a color filter substrate (Colour Filter, CF), and pouring liquid crystal between the thin film transistor substrate and the color filter substrate. The backlight module is used to provide sufficient brightness and evenly distributed light sources for the liquid crystal display panel so that it can display images normally. Before the liquid crystal display device leaves the factory, a lighting test must be carried out to ensure its quality.

Fig. 1 is the module schematic diagram of the test fixture of the liquid crystal display device of prior art, as shown in Figure 1, test fixture comprises master switch 10, first power supply module 11, second power supply module 12, field programmable gate array ( Field-Programmable Gate Array, FPGA) 13, microcontroller 14 and signal output module 15. Wherein, when the main switch 10 is closed, the front-end equipment inputs voltage to the test fixture, and after each module in the test fixture is configured and enters stable operation, the test fixture starts to output voltage and signal to the liquid crystal display device. Specifically, the first power supply module 11 provides the voltage required for the work of the FPGA 13 and the microcontroller 14, the second power supply module 12 provides the voltage required for the operation of the liquid crystal display device, and the FPGA 13 regulates the signal output module 15 to make it output The signal required for the operation of the liquid crystal display device. When the test fixture is performing the lighting test, the liquid crystal display device needs to be replaced due to the test requirements. Since the current liquid crystal display device does not support live plugging and unplugging, the only way to cut off the total power entering the test fixture is to completely stop the test fixture from working. , without any signal and voltage output, wait for the test personnel to replace the liquid crystal display device, then turn on the main switch 10, and the test fixture starts working again.

However, in the prior art, a lot of time is wasted in the process of restarting the test fixture to complete the initial configuration of a series of modules, especially for the test of a large number of liquid crystal display devices, it is more likely to cause a waste of time; in addition, the test If the jig is turned on and off too frequently, the service life of the components in each module in the test jig will be reduced, and even the jig will be damaged, which will increase the cost.

Therefore, it is necessary to provide an improved technical solution to overcome the above technical problems in the prior art.

Utility model content

In view of the above problems, the utility model provides a test fixture for a display panel, which saves time and reduces costs.

The utility model provides a test fixture for a display panel. The test fixture is connected with the display panel for generating signals and voltages used for display panel testing. The test fixture includes a first A switch, a power supply module, a signal conversion module for outputting test signals to the display panel, a control module and a second switch. Wherein, the power supply module is connected to the first switch; the signal conversion module is connected to the power supply module; the control module is connected to the voltage enabling terminal of the power supply module and the signal enabling terminal of the signal conversion module The terminal is connected; the second switch is connected with the control module.

In a preferred embodiment of the present utility model, the test fixture also includes:

A microcontroller, the microcontroller is connected to the control module and the power supply module.

In a preferred embodiment of the present utility model, the power supply module includes a first power supply module and a second power supply module, the first power supply module is connected to the signal conversion module and the control module, and the second power supply module The voltage enabling terminal of the module is connected with the control module.

In a preferred embodiment of the present invention, the first power supply module outputs a working voltage of 3V or 5V to the control module and the signal conversion module.

In a preferred embodiment of the present utility model, the second power supply module outputs a working voltage of 2.8V or 3.3V to the display panel.

In a preferred embodiment of the present invention, the high level of the signal enabling terminal of the signal conversion module is 3.3V, and the low level is 0.

In a preferred embodiment of the present invention, the control module is a field programmable gate array.

In a preferred embodiment of the present invention, the signal conversion module outputs a low voltage differential signal to the display panel.

In a preferred embodiment of the present utility model, the second switch is a button.

In a preferred embodiment of the present utility model, the second switch is a single pole single throw switch or a single pole double throw switch.

The test fixture of the display panel provided by the utility model connects the signal enabling end of the signal conversion module and the voltage enabling end of the power supply module to the control module, controls the working mode of the control module through the second switch, and then makes the control module control The level of the signal enable terminal and the voltage enable terminal is used to control the output of the signal conversion module and the power supply module, so that the display panel only needs to be replaced during the batch test process without cutting off the total power supply of the test fixture. Each module in the test fixture does not need to be reconfigured, which saves time. In addition, the component life of each module in the test fixture is improved and the cost is reduced.

Description of drawings

FIG. 1 is a block diagram of a test fixture for a liquid crystal display device in the prior art.

FIG. 2 is a block diagram of a test fixture for a display panel provided by an embodiment of the present invention.

Detailed ways

In order to further explain the technical means and effects of the utility model to achieve the intended purpose of the invention, the specific implementation methods, methods, Steps, structure, features and effects are described in detail below.

Please refer to FIG. 2 . FIG. 2 is a block diagram of a test fixture for a display panel provided by an embodiment of the present invention. As shown in FIG. 2 , the test fixture includes a first switch 20 , a power supply module 21 , a signal conversion module 22 , a control module 23 , a microcontroller 24 and a second switch 25 . Wherein, the first switch 20 receives the voltage input by the external general power supply, and the first switch 20 is connected to the power supply module 21 . In this embodiment, the power supply module 21 includes a first power supply module 210 and a second power supply module 212, the first power supply module 210 is connected with the signal conversion module 22, the control module 23 and the microcontroller 24, the voltage of the second power supply module 212 The enabling terminal (not shown in the figure) is connected to the control module 23 . The signal enabling terminal (not marked) of the signal conversion module 22 is connected with the control module 23 . The control module 23 is connected with the microcontroller 24 , the second switch 25 , the voltage enable terminal of the second power supply module 212 and the signal enable terminal of the signal conversion module 22 .

Specifically, the first switch 20 is used to control the input of the external general power supply. The power supply module 21 is used to provide the voltage required for the work to each module in the test fixture, wherein the first power supply module 210 is used to provide the voltage required for the work to the signal conversion module 22, the control module 23 and the microcontroller 24, The second power supply module 212 provides the display panel (not shown in the figure) with the voltage required for testing, and the signal conversion module 22 outputs the testing signal to the display panel. The control module 23 regulates the level of the signal enable terminal of the signal conversion module 22 and the voltage enable terminal of the second power supply module 212 through its internal coding program, so that the signal conversion module 22 outputs a test signal to the display panel and makes the second The second power supply module 212 outputs the operating voltage to the display panel. The second switch 25 is used to control the working mode of the control module 23 . The microcontroller 24 is used to initialize the display panel. Preferably, in this embodiment, the control module 22 is a field programmable gate array.

Further, when the first switch 20 is closed, the external power supply inputs the required voltage to the test fixture, and when the first switch is turned off, the test fixture does not work. In addition, when the second switch 25 is closed, the control module 23 works, and it controls the signal enable end of the signal conversion module 22 to be high level according to the internal coding program, so that the signal conversion module 22 outputs a test signal to the display panel; at the same time When the second switch 25 is closed, the control module 23 controls the voltage enable terminal of the second power supply module 212 to be at a high level according to an internal coding program, so that the second power supply module 212 outputs an operating voltage to the display panel.

When the display panel needs to be replaced, the test fixture provided by the utility model does not need to disconnect the first switch 20, that is to say, it is not necessary to cut off the total power supply of the test fixture, but only needs to disconnect the second switch 25. When the second switch 25 is turned off, the control module 23 controls the signal enable terminal of the control signal conversion module 22 to be low level according to its internal coding program, so that the signal conversion module 22 cannot output the test signal to the display panel and control the second switch. The voltage enable terminal of the power supply module 212 is at a low level, so that the second power supply module 212 has no working voltage output to the display panel, and at this time, other modules in the fixture are still working. Of course, those skilled in the art can understand that, in other embodiments, when the signal enabling terminal of the signal converting module 22 is at a low level, the signal converting module 22 outputs a test signal to the display panel, and the signal enabling terminal of the signal converting module 22 When it is at a high level, the signal conversion module 22 cannot output a test signal to the display panel; When the voltage enable terminal is at a high level, the second power supply module 212 has no working voltage output to the display panel.

In an embodiment of the present invention, the high level of the voltage enable terminal of the second power supply module 212 is 3.3V, and the low level is 0. Of course, those skilled in the art can understand that the high level of the voltage enable terminal of the second power supply module 212 can also be other values, such as 5V.

In an embodiment of the present utility model, the first power supply module 210 outputs a working voltage of 3V or 5V to the signal conversion module 22 , the control module 23 and the microcontroller 24 .

In an embodiment of the present invention, the second power supply module 212 outputs a working voltage of 2.8V or 3.3V to the display panel. Of course, those skilled in the art can understand that the second power supply module 212 can output voltages of other values to the display panel, and the value is determined by the working voltage required by display panels of different specifications.

In an embodiment of the present invention, the high level of the signal enabling terminal of the signal conversion module 22 is 3.3V, and the low level is 0.

In an embodiment of the present invention, the signal conversion module 22 outputs a low voltage differential signal (Low Voltage Differential Signaling, LVDS) to the display panel.

In one embodiment of the present utility model, the second switch 25 is a button. Of course, those skilled in the art can understand that the second switch 25 can also be other components, such as a single-pole single-throw switch, a single-pole double-throw switch, and the like.

The test fixture of the display panel of the present utility model connects the signal enabling end of the signal conversion module 22 and the voltage enabling end of the second power supply module 212 to the control module 23, and controls the working mode of the control module 23 through the second switch 25 , so that the control module 23 controls the levels of the signal enable terminal and the voltage enable terminal to control the output of the signal conversion module 22 and the second power supply module 212, so that the display panel only needs to be replaced during the batch test process, instead of The total power supply of the test fixture needs to be cut off, and each module in the test fixture does not need to be reconfigured, which saves time. In addition, the life of components in each module in the test fixture is improved and the cost is reduced.

The aforementioned and other technical contents, features and effects of the present invention will be clearly presented in the following detailed description of preferred embodiments with reference to the drawings. Through the description of the specific implementation mode, the technical means and effects of the utility model to achieve the predetermined purpose can be understood more deeply and specifically, but the attached drawings are only for reference and description, and are not used to explain the utility model. new restrictions.

The above are only preferred embodiments of the present utility model, and do not limit the utility model in any form. Although the utility model has been disclosed as above with preferred embodiments, it is not intended to limit the utility model. Any Those who are familiar with this profession, without departing from the scope of the technical solution of the present utility model, can use the technical content disclosed above to make some changes or modify equivalent embodiments with equivalent changes, but all without departing from the technical solution of the utility model Content, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the utility model still belong to the scope of the technical solution of the utility model.

Claims (10)

1. A test fixture of a display panel, the test fixture is connected with the display panel, and is used to generate signals and voltages used for display panel testing, it is characterized in that the test fixture comprises: a first switch for controlling the total power input; a power supply module, the power supply module is connected to the first switch; A signal conversion module for outputting test signals to the display panel, the signal conversion module is connected to the power supply module; A control module, the control module is connected to the voltage enable terminal of the power supply module and the signal enable terminal of the signal conversion module; A second switch, the second switch is connected to the control module. 2. The test fixture of the display panel according to claim 1, wherein the test fixture further comprises: A microcontroller, the microcontroller is connected to the control module and the power supply module. 3. The test fixture of the display panel according to claim 1, wherein the power supply module comprises a first power supply module and a second power supply module, the first power supply module and the signal conversion module and the The control module is connected, and the voltage enabling terminal of the second power supply module is connected with the control module. 4 . The test fixture for a display panel according to claim 3 , wherein the first power supply module outputs a working voltage of 3V or 5V to the control module and the signal conversion module. 5 . The test fixture for a display panel according to claim 3 , wherein the second power supply module outputs an operating voltage of 2.8V or 3.3V to the display panel. 6 . The test fixture for a display panel according to claim 1 , wherein the high level of the signal enabling terminal of the signal conversion module is 3.3V, and the low level is 0. 7 . 7. The test fixture for a display panel according to claim 1, wherein the control module is a field programmable gate array. 8 . The test fixture for a display panel according to claim 1 , wherein the signal conversion module outputs a low voltage differential signal to the display panel. 9. The test fixture for a display panel according to claim 1, wherein the second switch is a button. 10 . The test fixture for a display panel according to claim 1 , wherein the second switch is a single pole single throw switch or a single pole double throw switch. 11 .