Backlight detection device for liquid crystal display screen production

Abstract

The utility model discloses a kind of backlight detection devices for liquid crystal display production, comprising: base, the top of the base is fixed with first mounting bracket and second mounting bracket by bolt, the left side of the first mounting bracket is equipped with first motor, the output of the first motor is fixed with first rotating shaft passing through the first mounting bracket, the right side of the first rotating shaft is fixed with arc link, the right side end of the arc link is rotatably connected with adjusting seat, the rear end of the second mounting bracket is fixed with second motor, device is driven by the cooperation of first motor and second motor, realize adjusting seat multidimensional multi-angle swing of driving display screen, break the limitation of traditional fixed angle detection.Detector can capture backlight state under different viewing angles in display screen dynamic adjustment process, substantially improve the accuracy and comprehensiveness of backlight detection result, provide reliable support for product quality control.

Description

Technical Field

[0001] This utility model relates to the field of liquid crystal display technology, specifically to a backlight testing device for liquid crystal display production. Background Technology

[0002] In the production process of LCD screens, the brightness, uniformity, and absence of defects in the backlight are key indicators determining product quality. Therefore, backlight testing is an indispensable and crucial step. Currently, factories commonly use fixed testing fixtures to perform backlight testing on displays. These devices typically include a horizontal platform and a detector located on one side. In actual testing, due to the influence of viewing angle and light reflection, operators need to inspect the display from multiple angles and perspectives to accurately determine whether there are problems such as uneven brightness, light leakage, or dark spots in the backlight.

[0003] However, existing testing devices have obvious drawbacks: their placement platforms are mostly fixed structures or can only be adjusted in a single direction, making it impossible to flexibly change the tilt angle and orientation of the LCD screen. Fixed-angle testing methods cannot meet the requirements of multi-angle testing, which may lead to the omission of defects at certain angles, affecting the accuracy and reliability of the test results, and thus reducing product quality.

[0004] Therefore, there is an urgent need for a new type of backlight detection device that can flexibly and stably adjust the spatial orientation of the LCD screen to achieve efficient and accurate backlight detection from multiple angles of the screen. Utility Model Content

[0005] To achieve the above objectives, this utility model provides the following technical solution: a backlight testing device for LCD screen production, comprising: a base, a first mounting bracket and a second mounting bracket fixed to the top of the base by bolts; a first motor mounted on the left side of the first mounting bracket; a first rotating shaft fixed to the output end of the first motor passing through the first mounting bracket; an arc-shaped connecting rod fixed to the right side of the first rotating shaft; an adjusting seat rotatably connected to the right end of the arc-shaped connecting rod; a second motor fixed to the rear end of the second mounting bracket; a second rotating shaft fixed to the output end of the second motor passing through the second mounting bracket; and a second rotating shaft fixed to the front end of the second rotating shaft. The device has a U-shaped frame, with a mounting post fixed to the top of the adjusting seat, a placement plate fixed to the top of the mounting post, and an L-shaped limiting plate fixed to the top edge of the placement plate. Three sets of parallel sliding grooves are formed on the top surface of the placement plate. A lead screw is rotatably connected to the interior of the middle sliding groove via a bearing. Limiting posts are fixed inside the sliding grooves on both sides. A first slider is threaded onto the lead screw, and a second slider is slidably fitted onto each of the limiting posts. A clamping block for holding the display screen is fixedly connected to the top of both the first and second sliders. A third motor is installed through the front end of the lead screw, passing through the placement plate.

[0006] As a preferred embodiment of this utility model, a support frame is fixed to the left end of the base, and a detector is installed on the end face of the support frame.

[0007] As a preferred embodiment of this utility model, the end of the U-shaped frame is rotatably connected to both sides of the adjusting seat, and the end of the arc-shaped connecting rod is rotatably connected to the front end of the adjusting seat.

[0008] As a preferred embodiment of this utility model, the bottom of the adjusting seat is spherical, and the axis of the first rotating shaft coincides with the spherical center of the adjusting seat.

[0009] As a preferred embodiment of this utility model, the center of the first slider is provided with an internal threaded hole that matches the lead screw, and the center of the second slider is provided with a smooth through hole that fits with the limiting post.

[0010] As a preferred embodiment of this utility model, the first slider and each of the second sliders can slide along the corresponding grooves respectively, and drive the clamping block to move synchronously.

[0011] As a preferred embodiment of this utility model, rubber pads are fixed to the inner sides of both the L-shaped limiting plate and the clamping block.

[0012] Compared with the prior art, the present invention has the following beneficial effects:

[0013] (1) Improved detection accuracy and comprehensiveness: The device achieves multi-dimensional and multi-angle swinging of the display screen driven by the coordinated drive of the first and second motors, breaking the limitations of traditional fixed-angle detection. The detector can capture the backlight state from different angles during the dynamic adjustment of the display screen, greatly improving the accuracy and comprehensiveness of the backlight detection results and providing reliable support for product quality control.

[0014] (2) Enhanced ease of operation and inspection efficiency: On the one hand, the workpiece positioning process combines the pre-limiting of the L-shaped limiting plate with the automatic clamping driven by the third motor, eliminating the need for manual adjustment of the clamping position and simplifying the loading and positioning process; on the other hand, the angle adjustment is automatically controlled by the motor drive, which can quickly switch the inspection angle, significantly improve the inspection efficiency, and meet the inspection needs in the mass production of the factory.

[0015] (3) Stable and reliable structure with strong adaptability: The design of the spherical structure at the bottom of the adjustment seat coinciding with the axis of the first rotating shaft ensures smooth movement without jamming or deviation during angle adjustment; in addition, by adjusting the travel of the clamping block, it can be adapted to LCD screens of different sizes and specifications without the need to replace special tooling, thus improving the applicability and practicality of the device. Attached Figure Description

[0016] The accompanying drawings are provided to further illustrate the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention, but do not constitute a limitation thereof. In the drawings:

[0017] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0018] Figure 2 This is a three-dimensional structural diagram of the adjustment seat of this utility model;

[0019] Figure 3 This is a top view of the adjustment seat of this utility model;

[0020] Figure 4 This is a top view of the placement plate of this utility model;

[0021] Figure 5 This is a front sectional view of the placement plate of this utility model.

[0022] In the diagram: 1. Base; 2. Support frame; 3. Detector; 4. First mounting frame; 41. First motor; 42. First rotating shaft; 43. Arc-shaped connecting rod; 5. Second mounting frame; 51. Second motor; 52. Second rotating shaft; 53. U-shaped frame; 6. Adjustment seat; 61. Mounting column; 7. Placement plate; 71. L-shaped limiting plate; 72. Slide groove; 73. Lead screw; 74. Limiting column; 75. First slider; 751. Second slider; 76. Clamping block; 77. Third motor; 78. Rubber pad. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0024] Example

[0025] Please see Figure 1-5 This utility model provides the following technical solution: A backlight testing device for LCD screen production, comprising: a base 1, a first mounting bracket 4 and a second mounting bracket 5 fixed to the top of the base 1 by bolts; a first motor 41 mounted on the left side of the first mounting bracket 4, the output end of the first motor 41 passing through the first mounting bracket 4 and fixed to a first rotating shaft 42; an arc-shaped connecting rod 43 fixed to the right side of the first rotating shaft 42, the right end of the arc-shaped connecting rod 43 rotatably connected to an adjusting seat 6; a second motor 51 fixed to the rear end of the second mounting bracket 5, the output end of the second motor 51 passing through the second mounting bracket 5 and fixed to a second rotating shaft 52; a U-shaped frame 53 fixed to the front end of the second rotating shaft 52; and an adjusting seat 6. A mounting post 61 is fixed to the top of the mounting post 61, and a placement plate 7 is fixed to the top of the mounting post 61. An L-shaped limiting plate 71 is fixed to the top edge of the placement plate 7. Three sets of parallel sliding grooves 72 are opened on the top surface of the placement plate 7. A lead screw 73 is rotatably connected to the inside of the middle sliding groove 72 through a bearing. Limiting posts 74 are fixed inside the two side sliding grooves 72. A first slider 75 is threadedly connected to the lead screw 73. A second slider 751 is slidably sleeved on each limiting post 74. A clamping block 76 for clamping the display screen is fixedly connected to the top of the first slider 75 and the second slider 751. A third motor 77 is installed through the front end of the lead screw 73 through the placement plate 7.

[0026] In order to ensure that the detector 3 can be stably installed in a position relatively fixed to the placement plate 7, and to provide reliable hardware support for subsequent backlight performance testing of the display screen, and to achieve stability and accuracy of signal acquisition during the testing process, in this embodiment, as a preferred technical solution of the present invention, a support frame 2 is fixed to the left end of the base 1, and the detector 3 is installed on the end face of the support frame 2.

[0027] In order to enable the adjustment seat 6 to simultaneously receive power transmission from the arc-shaped connecting rod 43 and the U-shaped frame 53, and realize rotation around different axes, thereby providing the placement plate 7 with swing freedom in the front-back and left-right directions, meeting the multi-angle adjustment requirements, and avoiding motion interference, in this embodiment, as a preferred technical solution of the present invention, the end of the U-shaped frame 53 is rotatably connected to both sides of the adjustment seat 6, and the end of the arc-shaped connecting rod 43 is rotatably connected to the front end of the adjustment seat 6.

[0028] In order to give the adjustment seat 6 the flexibility to rotate in multiple directions, while ensuring that the center of rotation is fixed when it swings around the first rotating shaft 42, so as to avoid interference with the rotation of the U-shaped frame 53, and to satisfy that the placement plate 7 can rotate in the front-back and left-right directions, in this embodiment, as a preferred technical solution of the present invention, the bottom structure of the adjustment seat 6 is a spherical structure, and the axis of the first rotating shaft 42 coincides with the spherical center of the adjustment seat 6.

[0029] In order to convert the rotational motion of the lead screw 73 into the linear motion of the first slider 75 through the threaded engagement, and at the same time to use the guiding effect of the limiting post 74 on the second slider 751 to avoid the slider from jamming or deviating during the movement, and to ensure the smoothness and accuracy of the movement of the clamping block 76, in this embodiment, as a preferred technical solution of the present invention, the center of the first slider 75 is provided with an internal threaded hole that matches the lead screw 73, and the center of the second slider 751 is provided with a smooth through hole that fits with the limiting post 74.

[0030] In order to ensure that the clamping block 76 is subjected to uniform force during movement and can work in conjunction with the L-shaped limiting plate 71 to achieve stable clamping of the display screen, and to avoid the display screen tilting or clamping failure due to unstable movement of the clamping block 76, thereby improving the reliability of workpiece positioning, in this embodiment, as a preferred technical solution of the present invention, the first slider 75 and each of the second sliders 751 can slide along the corresponding slide groove 72 respectively, and drive the clamping block 76 to move synchronously.

[0031] In order to achieve flexible contact when clamping the display screen and avoid damage such as scratches and indentations to the display screen surface caused by rigid clamping, and at the same time improve clamping stability by increasing friction to prevent the display screen from shifting due to swinging during the testing process and reduce workpiece wear, in this embodiment, as a preferred technical solution of the present invention, rubber pads 78 are fixed on the inner sides of both the L-shaped limiting plate 71 and the clamping block 76.

[0032] In summary, with the help of the above-described technical solution of this utility model,

[0033] Working Principle: Workpiece Loading and Positioning Stage: First, the operator initially positions the LCD screen to be tested along the inner side of the L-shaped limiting plate 71 at the top edge of the placement plate 7. The L-shaped limiting plate 71 can limit the two adjacent sides of the screen through its own structure, preventing displacement during placement. Subsequently, the third motor 77 is started through the PLC control system. The output end of the third motor 77 drives the lead screw 73 to rotate. The rotation of the lead screw 73 is converted into the linear movement of the first slider 75 along the slide groove 72. At the same time, the second slider 751 slides synchronously along the limiting post 74 with the first slider 75. Together, they drive the clamping block 76 fixed at the top to move towards the screen until it cooperates with the L-shaped limiting plate 71 to firmly clamp the screen. During this process, the rubber pad 78 fixed inside the L-shaped limiting plate 71 and the clamping block 76 will make flexible contact with the surface of the screen, which not only avoids scratches to the screen caused by rigid clamping, but also improves the clamping stability by increasing friction, thus completing the positioning and fixing of the workpiece.

[0034] Multi-angle adjustment stage: The first motor 41 on the left side of the first mounting bracket 4 is activated. The output of the first motor 41 passes through the first mounting bracket 4 and drives the first rotating shaft 42 to rotate. The arc-shaped connecting rod 43 fixed on the right side of the first rotating shaft 42 rotates synchronously, causing the adjusting seat 6 to swing back and forth around the axis of the first rotating shaft 42. This, in turn, drives the placement plate 7 and the clamped display screen through the mounting column 61 at the top to achieve front-to-back angle adjustment. The second motor 51 at the rear of the second mounting bracket 5 is activated. The output of the second motor 51 passes through the second mounting bracket 5 and drives the second rotating shaft 52 to rotate. The U-shaped frame 53 fixed at the front end of the second rotating shaft 52 rotates synchronously, similarly driving the placement plate 7 and the display screen through the mounting column 61 to achieve left-to-right angle adjustment. Through independent or coordinated control of the first motor 41 and the second motor 51, the adjusting seat 6 can drive the placement plate 7 to achieve multi-dimensional and multi-angle swinging, covering various viewing angles required for display screen backlight detection.

[0035] Dynamic testing phase: While the placement plate 7 swings at multiple angles according to a preset program or under manual control, the detector 3 is activated. The detector 3 continuously tests the backlight performance of the display screen during dynamic angle adjustments, capturing the brightness distribution of the display screen from different viewing angles, and detecting defects such as light leakage, dark spots, and uneven brightness, thus completing a comprehensive backlight testing process. After the test is completed, the third motor 77 is started in reverse to reset the clamping block 76, allowing the tested display screen to be removed.

[0036] Finally, it should be noted that, in this utility model, unless otherwise explicitly specified and limited, the terms "installation," "setting," "connection," "fixing," "screw connection," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0037] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A backlight testing device for liquid crystal display production, characterized in that, include: A base (1) is provided, with a first mounting bracket (4) and a second mounting bracket (5) fixed to its top end by bolts. A first motor (41) is mounted on the left side of the first mounting bracket (4). The output end of the first motor (41) passes through the first mounting bracket (4) and is fixed to a first rotating shaft (42). An arc-shaped connecting rod (43) is fixed to the right side of the first rotating shaft (42). An adjusting seat (6) is rotatably connected to the right end of the arc-shaped connecting rod (43). A second motor (51) is fixed to the rear end of the second mounting bracket (5). The output end of the second motor (51) passes through the second mounting bracket (5) and is fixed to a second rotating shaft (52). A U-shaped frame (53) is fixed to the front end of the second rotating shaft (52). A mounting column (61) is fixed to the top end of the adjusting seat (6). The top of the mounting post (61) is fixed with a placement plate (7), and an L-shaped limiting plate (71) is fixed at the top edge of the placement plate (7). The top surface of the placement plate (7) is provided with three sets of parallel sliding grooves (72). The inside of the middle sliding groove (72) is rotatably connected to a lead screw (73) through a bearing. The inside of the two side sliding grooves (72) is fixed with limiting posts (74). The lead screw (73) is threadedly connected with a first slider (75). Each limiting post (74) is slidably fitted with a second slider (751). The tops of the first slider (75) and the second slider (751) are fixedly connected with a clamping block (76) for clamping the display screen. The front end of the lead screw (73) passes through the placement plate (7) and is equipped with a third motor (77).

2. The backlight testing device for liquid crystal display production according to claim 1, characterized in that: A support frame (2) is fixed to the left end of the base (1), and a detector (3) is installed on the end face of the support frame (2).

3. The backlight testing device for liquid crystal display production according to claim 1, characterized in that: The end of the U-shaped frame (53) is rotatably connected to both sides of the adjusting seat (6), and the end of the arc-shaped connecting rod (43) is rotatably connected to the front end of the adjusting seat (6).

4. The backlight testing device for liquid crystal display production according to claim 1, characterized in that: The bottom of the adjustment seat (6) is spherical, and the axis of the first rotating shaft (42) coincides with the spherical center of the adjustment seat (6).

5. The backlight testing device for liquid crystal display production according to claim 1, characterized in that: The first slider (75) has an internal threaded hole at its center that matches the lead screw (73), and the second slider (751) has a smooth through hole at its center that matches the limiting post (74).

6. The backlight testing device for liquid crystal display production according to claim 1, characterized in that: The first slider (75) and each of the second sliders (751) can slide along the corresponding groove (72) respectively, and drive the clamping block (76) to move synchronously.

7. The backlight testing device for liquid crystal display production according to claim 1, characterized in that: Both the L-shaped limiting plate (71) and the clamping block (76) have rubber pads (78) fixed on their inner sides.

Images