Liquid crystal display device performance parameter testing device

Abstract

The utility model relates to a liquid crystal display device performance parameter testing device which comprises an electric signal generating module, a braking module, a light path module, a light current collecting module and a box body. The light path module comprises a laser source, an external thread mounting hole, an adjustable diaphragm, a cage plate, a polaroid, a liquid crystal holder, a cage rod, a cage type countersunk head groove, a stand column and an optical bread board, the brake module comprises an electric rotating table, a double-shaft motion controller, a switching power supply, a stepping motor driver and other elements, and the electric signal generation module comprises a digital signal generator. The light current acquisition module comprises a luminosity probe and a virtual oscilloscope. The device is simple and convenient to operate, a user can set voltage signals with different amplitudes according to requirements, the device can automatically apply the voltage signals set by the user to a liquid crystal box, and parameters such as threshold voltage, saturation voltage, response time and visual angle characteristics of a liquid crystal display device can be measured in real time through the light current acquisition module.

Description

Technical Field:

[0001] The utility model relates to the technical field of liquid crystal display, in particular to a device for testing performance parameters of a liquid crystal display device. Background Art:

[0002] With the continuous progress of information display technology, liquid crystal display technology is widely used in various display devices due to its characteristics of low energy consumption and thinness. The optimization and progress of this technology are crucial for improving the display effect and user experience of terminal products.

[0003] At present, most of the existing liquid crystal test equipment on the market are special instruments, and the measurement of various parameters usually requires multiple devices to work together. This not only increases the cost, but also complicates the operation process, affecting the measurement efficiency and data repeatability. Although the existing commercial equipment has high measurement accuracy and stability, its price is expensive, which imposes a great economic burden on small and medium-sized laboratories and enterprises. In addition, the operation of these devices is complex, requiring users to have high professional knowledge, further restricting their wide application. On the other hand, although the self-made equipment in the laboratory has certain advantages in flexibility, it usually has deficiencies in stability and accuracy. These devices often need to be manually calibrated, with cumbersome operations and prone to errors, making it difficult to ensure the reliability and consistency of measurement data. Especially during long-term continuous measurement, the stability problem of self-made equipment is particularly prominent, affecting the credibility of experimental results.

[0004] Therefore, the utility model designs a device for testing performance parameters of a liquid crystal display device. This device integrates the measurement functions of parameters such as the threshold voltage, saturation voltage, response time, and viewing angle characteristics of liquid crystal devices, and can achieve multiple measurements on one device. This integrated design not only simplifies the operation process, improves the measurement efficiency, but also ensures the consistency and reliability of data. By integrating multiple measurement functions into one device, not only the cost is reduced, the operation is simplified, but also the error accumulation between different devices during the measurement process is reduced, significantly improving the reliability and repeatability of data. Content of the Utility Model:

[0005] In order to achieve the integrated testing of parameters such as the threshold voltage, saturation voltage, response time, and viewing angle characteristics of a liquid crystal display device, the present utility model provides a device for testing the performance parameters of a liquid crystal display device. This device uses a digital signal generator to accurately output a square-wave electrical signal with controllable amplitude and frequency to achieve electrical control of the liquid crystal cell. A two-axis motion controller and an electric turntable are used to rotate the liquid crystal cell to change the test viewing angle. When the test viewing angle of the liquid crystal cell or the voltage value applied to the liquid crystal cell changes, the light transmittance of the liquid crystal cell will change accordingly. When a transmitted light source irradiates a linear photometric probe, the output photocurrent of the photometric probe changes linearly with the intensity of the transmitted light. By using a virtual oscilloscope to collect the photocurrent, the electro-optical characteristics of the liquid crystal display device, such as the threshold voltage, saturation voltage, response time, and viewing angle characteristics, can be accurately measured, and experimental curves can be plotted.

[0006] The technical solution of the present utility model is as follows:

[0007] A device for testing the performance parameters of a liquid crystal display device, the device comprising an optical path module, a braking module, an electrical signal generating module, a photocurrent collecting module, and a box body. Among them, the optical path module is connected to the braking module through a first optical breadboard, the optical path module is connected to the electrical signal generating module through a liquid crystal holder, and the optical path module is connected to the photocurrent collecting module through a photometric probe. The optical path module, the braking module, the electrical signal generating module, and the photocurrent collecting module are integrated and enclosed inside the box body;

[0008] The optical path module includes a laser source, an external thread mounting hole, an adjustable aperture, a cage plate, a polarizer, a liquid crystal holder, a cage rod, a cage countersunk head groove, a column, and a first optical breadboard; the cage plate includes a first cage plate and a second cage plate; the polarizer includes a first polarizer and a second polarizer.

[0009] Wherein, the laser source, the external thread mounting hole, the adjustable iris, the assembly consisting of the first polarizer and the first cage plate, the liquid crystal holder, the assembly consisting of the second cage plate and the second polarizer are connected together through the cage countersunk groove, the column, the cage rod, and the first optical breadboard by threaded connection to form a rigid structure, which ensures the stability of the connection and can withstand bending moment. The brake module includes an electric rotating table, a T-shaped optical breadboard, a second optical breadboard, a dual-axis motion controller, a switching power supply and a stepper motor driver; the electric rotating table includes a first electric rotating table and a second electric rotating table; the switching power supply includes a first switching power supply and a second switching power supply; wherein, the first electric rotating table, the second electric rotating table, the T-shaped optical breadboard and the second optical breadboard are connected by threaded connection to form a rigid structure, the dual-axis motion controller is connected to the first switching power supply and the second switching power supply by wires, the first electric rotating table is connected to the first stepper motor driver and the first switching power supply by wires in turn, and the second electric rotating table is connected to the second stepper motor driver and the second switching power supply by wires in turn.

[0010] The braking module controls the first electric rotating stage and the second electric rotating stage to rotate through the dual-axis motion controller so as to make the liquid crystal box rotate along its geometric center fixed point;

[0011] Among them, the first electric rotating table and the second electric rotating table rotate in the horizontal direction and the vertical direction respectively, the rotation angle range is 0-360°, and the rotation speed range is 0.5-5° per second. The dual-axis motion controller can enable the first electric rotating table and the second electric rotating table to achieve simultaneous movement in two degrees of freedom directions according to user settings.

[0012] The adjustable range of the adjustable diaphragm is 0-12 mm.

[0013] The laser source comprises a semiconductor laser.

[0014] The length of the cage rods ranges from 100 to 150 mm.

[0015] The electrical signal generating module is composed of a digital signal generator.

[0016] The photocurrent acquisition module includes a photometer probe and a virtual oscilloscope.

[0017] The beneficial effects of the utility model are:

[0018] The utility model is easy to operate. Users can set voltage signals with different amplitudes according to their needs. The device can automatically apply the voltage signals set by users to the liquid crystal cell and measure parameters such as the threshold voltage, saturation voltage, response time, and viewing angle characteristics of the liquid crystal display device in real time through the photocurrent acquisition module. The device can also draw the dynamic response curve of the liquid crystal display device based on the experimental data, providing an important basis for performance evaluation and optimization. The design of the utility model fully considers the operation convenience of users. Users only need to simply set the amplitude of the required voltage signal, and the device can automatically perform corresponding tests and data acquisition. This not only improves the efficiency and accuracy of the test, but also reduces the complexity of the operation, and is applicable to the performance detection and research work of various liquid crystal display devices. The photocurrent acquisition module of the device can capture the electro-optical response of the liquid crystal display device under different voltage signals in real time and accurately, ensuring the reliability and repeatability of the test results. Through further processing and analysis of the test data, users can obtain the detailed dynamic response characteristic curve of the liquid crystal display device, so as to better understand and optimize the performance of liquid crystal materials and devices. Brief Description of the Drawings:

[0019] Figure 1 It is a structural diagram of a device for testing performance parameters of a liquid crystal display device provided by the utility model;

[0020] Figure 2 It is a schematic diagram of an optical path module provided by the utility model;

[0021] Figure 3 It is a schematic diagram of a braking module provided by the utility model;

[0022] Figure 4 It is a schematic diagram of an electrical signal generation module provided by the utility model;

[0023] Figure 5 It is a schematic diagram of a photocurrent acquisition module provided by the utility model;

[0024] Figure 6 It is a schematic diagram of a box body provided by the utility model;

[0025] Figure 7 It is the response time curve of 5CB liquid crystal measured by the utility model under the TN display mode;

[0026] Figure 8 It is the electro-optical characteristic curve of 5CB liquid crystal measured by the utility model under the TN display mode;

[0027] Figure 9 It is the viewing angle characteristic curve of 5CB liquid crystal measured by the utility model under the TN display mode. Detailed Embodiment:

[0028] To enable those skilled in the art to better understand the solution of the present utility model, the following will clearly and completely describe the technical solution in the embodiments of the present utility model with reference to the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part rather than all of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without creative efforts shall fall within the protection scope of the present utility model.

[0029] It should be noted that the terms "first", "second", etc. in the description and claims of the present utility model and the above-mentioned accompanying drawings are used to distinguish similar objects and do not necessarily need to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present utility model described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0030] As Figure 1 , it is a structural diagram of a device for testing performance parameters of a liquid crystal display device. It mainly includes an optical path module 1, a braking module 2, an electrical signal generating module 3, a photocurrent acquisition module 4, and a box body 5; among them, the optical path module 1 is connected to the braking module 2, the electrical signal generating module 3, and the photocurrent acquisition module 4. The box body 5 is connected to the optical path module 1, the braking module 2, the electrical signal generating module 3, and the photocurrent acquisition module 4.

[0031] As Figure 2 , the connection sequence of the optical path module 1 is that a first assembly composed of a laser source 6, an external thread mounting hole 7, an adjustable aperture 8, a first cage plate 9, and a first polarizer 10, a liquid crystal holder 11, and a second assembly composed of a second polarizer 12 and a second cage plate 13 are all connected by a cage counterbore 14, a column 15, a cage rod 16, and a first optical breadboard 17 by threaded connection to form a rigid structure. This structure ensures the stability of the connection and can withstand bending moments and other tensile and compressive forces;

[0032] The first optical breadboard 17 includes a first surface and a second surface opposite to each other. A first assembly consisting of a laser source 6, an external threaded mounting hole 7, an adjustable diaphragm 8, a first cage plate 9 and a first polarizer 10 is fixed on the first surface of the first optical breadboard 17 through a cage countersunk groove 14, a column 15 and a cage rod 16, and a second assembly consisting of a second polarizer 12 and a second cage plate 13 is fixed on the first surface of the first optical breadboard 17 through a cage countersunk groove 14, a column 15 and a cage rod 16; the positions of the first assembly and the second assembly on the first surface of the first optical breadboard 17 can be set according to actual needs. In one embodiment of the utility model, the first assembly and the second assembly are respectively located at the edge positions on opposite sides of the first surface of the first optical breadboard 17.

[0033] The first optical breadboard 17 includes a plurality of threaded holes, and the pillar 15 is connected to the first optical breadboard by threads.

[0034] The laser source 6 comprises a semiconductor laser.

[0035] The adjustable range of the adjustable aperture 8 is 0-12 mm.

[0036] The liquid crystal holder 11 is homemade and can fix the liquid crystal box to be tested at the geometric center of the detection light path. Insulating materials are used to ensure that the voltage signal applied to the liquid crystal box during the test is consistent with the voltage signal set by the user.

[0037] The length of the cage rods 16 is in the range of 100-150 mm.

[0038] like Figure 3 The connection sequence of the brake module 2 is the first electric rotating table 18, the second electric rotating table 19, the T-shaped optical breadboard 20 and the second optical breadboard 21, wherein the two breadboards 20 and 21 are connected by threads to form a rigid structure. The dual-axis motion controller 22 is connected to the first switching power supply 23 and the second switching power supply 24 through a wire, the first electric rotating table 18 is connected to the first stepper motor driver 25 and the first switching power supply 23 through a wire in turn, and the second electric rotating table 19 is connected to the second stepper motor driver 26 and the second switching power supply 24 through a wire in turn.

[0039] The brake module 2 controls the first electric rotating table 18 and the second electric rotating table to rotate 19 through the dual-axis motion controller 22 so as to rotate the liquid crystal box along its geometric center fixed point;

[0040] Among them, the first electric rotating table 18 and the second electric rotating table 19 rotate along the horizontal direction and the vertical direction respectively, with the rotation angle range being 0 - 360° and the rotation speed range being 0.5 - 5° per second. The biaxial motion controller 22 can enable the first electric rotating table 18 and the second electric rotating table 19 to perform simultaneous motion in two degrees of freedom directions according to user settings.

[0041] The first electric rotating table 18 and the second electric rotating table 19 include high-precision electric rotating tables.

[0042] The biaxial motion controller 21 includes a stepper servo motion controller.

[0043] Such as Figure 4 , the electric signal generating module 3 is composed of a digital signal generator 27.

[0044] The digital signal generator 27 includes a fully digital control signal generator.

[0045] Such as Figure 5 , the photocurrent acquisition module 4 is connected by a photometric probe 28 and a virtual oscilloscope 29, and the acquired data is directly transmitted from the virtual oscilloscope 29 to the computer.

[0046] Such as Figure 1 , the optical path module 1 and the braking module 2 are connected by a first optical breadboard 17, the optical path module 1 and the electric signal generating module 3 are connected by a liquid crystal holder 11, and the optical path module 1 and the photocurrent acquisition module 4 are connected by a photometric probe 28. The optical path module 1, the braking module 2, the electric signal generating module 3, and the photocurrent acquisition module 4 are integrated into one body and are enclosed inside the box body 5.

[0047] Such as Figure 6 , it is a schematic diagram of the box body 5. There is a groove in the box body that can support the first optical breadboard 17, and the bottom is used to fix the first switching power supply 23, the second switching power supply 24, the first stepper motor driver 25, the second stepper motor driver 26, and the virtual oscilloscope 29.

[0048] Such as Figure 7 , it is the 5CB liquid crystal response time curve measured by the present utility model in the TN display mode, corresponding to the normally white mode LCD, that is, the transmission optical axes of the polarizer and the analyzer are placed perpendicular to each other, and the rubbing direction of the liquid crystal cell forms a 45° angle with the polarizer. The experimental measurement process is as follows:

[0049] 1) Turn on the laser, adjust the light intensity, and fix the liquid crystal cell with a liquid crystal holder to ensure it is coaxial and at the same height as the optical device and the optical path is unobstructed. Set the voltage signal applied to the liquid crystal cell on the computer, and set the acquisition frequency and acquisition time of the virtual oscilloscope in the computer. Generally, the acquisition frequency is selected as 128 Hz, and the acquisition duration is selected as 15 s to obtain the data of the change in transmitted light intensity during the voltage change process;

[0050] 2) Use the collected data as the ordinate and add time as the abscissa to obtain the relationship between the transmitted light intensity of the liquid crystal cell and time during the voltage change process;

[0051] 3) Use data processing software to plot the graph, normalize the experimental data to obtain the original black measurement result and the final result of the experimental curve, that is, the liquid crystal response time curve. The abscissa of each curve in the figure is time, with the unit of ms, and the ordinate is the optical transmittance of the liquid crystal cell, dimensionless.

[0052] Such as Figure 8 , the electro-optical characteristic curve of 5CB liquid crystal in the TN display mode measured by the present utility model, corresponding to the normally white mode LCD, that is, the transmission axes of the polarizer and the analyzer are placed perpendicular to each other, and the rubbing direction of the liquid crystal cell forms an angle of 45° with the polarizer. The experimental measurement process is as follows:

[0053] 1) Turn on the laser, adjust the light intensity, and fix the liquid crystal cell with a liquid crystal holder to ensure it is coaxial and at the same height as the optical device and the optical path is unobstructed. Set the voltage signal applied to the liquid crystal cell on the computer, and set the acquisition frequency and acquisition time of the virtual oscilloscope in the computer. Generally, the acquisition frequency is selected as 128 Hz, and the acquisition duration is selected as 15 s. Set the driving voltage to increase from 0.0 V to 4.0 V with a step voltage of 0.1 V to obtain the data of the change in transmitted light intensity during the voltage change process;

[0054] 2) Use the collected data as the ordinate and add voltage as the abscissa to obtain the relationship between voltage and the transmitted light intensity of the liquid crystal cell;

[0055] 3) Use data processing software to plot the graph, normalize the experimental data to obtain the original black measurement result and the final result of the experimental curve, that is, the electro-optical characteristic curve of the liquid crystal. The abscissa of the curve in the figure is voltage, with the unit of V, and the ordinate is the optical transmittance of the liquid crystal cell, dimensionless.

[0056] Such as Figure 9 , the viewing angle characteristic curve of 5CB liquid crystal in the TN display mode measured by the present utility model, corresponding to the normally white mode LCD, that is, the transmission axes of the polarizer and the analyzer are placed perpendicular to each other, and the rubbing direction of the liquid crystal cell forms an angle of 45° with the polarizer. The experimental measurement process is as follows:

[0057] 1) Turn on the laser, adjust the light intensity, and fix the liquid crystal cell with a liquid crystal holder to ensure coaxiality and equal height with the optical device and a clear light path. Set the voltage signal applied to the liquid crystal cell on the computer and set the acquisition density of the virtual oscilloscope in the computer. Generally, the acquisition density is set to 1 acquisition per second. Set the angle change on the motion controller. Generally, the stepping angles of the first rotary table and the second electric rotary table are set to 2 degrees to obtain the data of the transmitted light intensity change during the viewing angle change;

[0058] 2) Plot the collected data as a polar coordinate graph, where the radial coordinate is the viewing angle, the normal coordinate is the azimuth angle, and the curve in the polar coordinate system is the equal contrast curve to obtain the relationship between the transmitted light intensity of the liquid crystal cell and the viewing angle change;

[0059] 3) Use data processing software to plot the graph, normalize the experimental data to obtain the original measurement result, and obtain the final result of the experimental curve, that is, the viewing angle characteristic curve.

[0060] Matters not covered by this utility model are well-known technologies.

[0061] The above specific embodiments do not constitute a limitation on the protection scope of this utility model. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model shall be included within the protection scope of this utility model.

Claims

1. A liquid crystal display device performance parameter testing device, characterized in that: include: An electrical signal generating module, a braking module, an optical path module, a photocurrent collection module and a housing, wherein the optical path module is connected to the braking module via a first optical breadboard, the optical path module is connected to the electrical signal generating module via a liquid crystal holder, and the optical path module is connected to the photocurrent collection module via a photometric probe; the optical path module, the braking module, the electrical signal generating module, and the photocurrent collection module are integrated into one body and wrapped inside the housing; The optical path module includes a laser source, an external thread mounting hole, an adjustable diaphragm, a cage plate, a polarizer, a liquid crystal holder, a cage rod, a cage countersunk groove, a column and a first optical breadboard; the cage plate includes a first cage plate and a second cage plate; the polarizer includes a first polarizer and a second polarizer; The laser source, the external thread mounting hole, the adjustable iris, the assembly consisting of the first polarizer and the first cage plate, the liquid crystal holder, the assembly consisting of the second cage plate and the second polarizer are connected together through the cage countersunk groove, the column, the cage rod, and the first optical breadboard by threaded connection to form a rigid structure, which ensures the stability of the connection and can withstand bending moment; The brake module includes an electric rotating table, a T-shaped optical breadboard, a second optical breadboard, a dual-axis motion controller, a switching power supply and a stepper motor driver; the electric rotating table includes a first electric rotating table and a second electric rotating table; the switching power supply includes a first switching power supply and a second switching power supply; Among them, the first electric rotating table, the second electric rotating table, the T-shaped optical breadboard and the second optical breadboard are connected by threads to form a rigid structure, the dual-axis motion controller is connected to the first switching power supply and the second switching power supply through a wire, the first electric rotating table is connected to the first stepper motor driver and the first switching power supply through a wire in turn, and the second electric rotating table is connected to the second stepper motor driver and the second switching power supply through a wire in turn.

2. A liquid crystal display device performance parameter testing device as claimed in claim 1, characterized in that: The braking module controls the first electric rotating stage and the second electric rotating stage to rotate through the dual-axis motion controller so as to make the liquid crystal box rotate along its geometric center fixed point; Among them, the first electric rotating table and the second electric rotating table rotate in the horizontal direction and the vertical direction respectively, the rotation angle range is 0-360°, and the rotation speed range is 0.5-5° per second. The dual-axis motion controller can enable the first electric rotating table and the second electric rotating table to achieve simultaneous movement in two degrees of freedom directions according to user settings.

3. A liquid crystal display device performance parameter testing device as claimed in claim 1, characterized in that: The adjustable range of the adjustable diaphragm is 0-12 mm.

4. A liquid crystal display device performance parameter testing device as claimed in claim 1, characterized in that: The laser source comprises a semiconductor laser.

5. A liquid crystal display device performance parameter testing device as claimed in claim 1, characterized in that: The length of the cage rods ranges from 100 to 150 mm.

6. A liquid crystal display device performance parameter testing device as claimed in claim 1, characterized in that: The electrical signal generating module is composed of a digital signal generator.

7. A liquid crystal display device performance parameter testing device as claimed in claim 1, characterized in that: The photocurrent acquisition module includes a photometer probe and a virtual oscilloscope.

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