LED display screen dark spot detection device

Abstract

The utility model discloses an LED display screen dark spot detection device which comprises a detection box, a detection table is connected in the detection box in a sliding mode, a placing groove is formed in the detection table, an LED display screen is placed in the placing groove, thermo-sensitive paper is arranged on the LED display screen, a wire inserting groove is formed in the front end of the detection table, and the wire inserting groove is connected with the detection table in a sliding mode. The wire inserting groove is communicated with the interior of the placing groove, and the detection box is provided with a positioning mechanism. According to the LED display screen, the situation that the LED lamp beads corresponding to the dark spot areas do not emit light or emit light weakly is shown through the color development condition of the thermo-sensitive paper, workers are prevented from directly observing the light-emitting LED display screen with eyes, eye fatigue of the workers is reduced, and therefore the dark spot omission ratio is reduced.

Description

Technical Field

[0001] This utility model relates to the field of electronic product testing equipment, specifically to a device for detecting dark spots on an LED display screen. Background Technology

[0002] LED displays are flat panel devices that achieve display by controlling semiconductor light-emitting diodes (LEDs). They feature high brightness, long lifespan, rich colors, and strong adaptability, and are widely used in advertising, information dissemination, stage backdrops, conference displays, exhibition halls, command and dispatch, data display, and other fields.

[0003] To further understand the existing LED display screen dark spot detection device, a search revealed that Chinese Patent No. CN216695519U discloses an LED display screen dark spot detection device, including two connecting plates. A U-shaped detection block is fixedly connected between the two connecting plates. The front side of the U-shaped detection block extends through the front connecting plate. An elliptical light-blocking cloth is movably fitted on the outer surface of the U-shaped detection block between the two connecting plates. A detection groove extending out of the light-blocking cloth is formed on the light-blocking cloth. A handle is fixedly connected to the light-blocking cloth. Two mirror-shaped fixing plates are provided on the upper surface of the horizontal plate of the U-shaped detection block. A connecting groove is formed on the upper surface of the horizontal plate of the U-shaped detection block. Two connecting sliders, both of which are slidably connected to the connecting groove, are fixedly connected to the lower surfaces of the two fixing plates.

[0004] After exploration and analysis, the patent has the following drawbacks in actual use: Although the patent uses a light-blocking cloth to block the light emitted by the LED display screen during the detection process, reducing the light stimulation to the eyes of the staff, it relies on the staff's subjective judgment of brightness, which can easily lead to the missed detection of weak dark spots. At the same time, even if the light stimulation to the staff's eyes is reduced, the staff's eyes will still become fatigued during long-term detection, which will lead to an increase in the missed detection rate. Utility Model Content

[0005] To address the technical problems of existing methods that rely on manual subjective judgment of dark spots on LED displays, which easily leads to the omission of weak dark spots, and the increased omission rate due to eye fatigue of workers during long-term testing, this utility model provides an LED display dark spot detection device.

[0006] The technical solution adopted by this utility model is as follows: it includes a testing box, a testing platform is slidably connected in the testing box, a placement slot is opened on the testing platform, an LED display screen is placed in the placement slot, thermal paper is set on the LED display screen, a wire insertion slot is opened at the front end of the testing platform, the wire insertion slot is connected to the interior of the placement slot, and a positioning mechanism is provided on the testing box.

[0007] Furthermore, the positioning mechanism includes a slot at the front end of the testing box, a mounting groove on the testing box, and a transparent plate fixedly mounted on the mounting groove. The transparent plate is provided with grid lines, and two sets of scale lines are fixedly provided on the testing box, with the two sets of scale lines corresponding to the grid lines.

[0008] By adopting the above technical solution, the location of dark spots on the LED display screen can be accurately located.

[0009] Furthermore, the testing box is provided with a retrieval slot, which is connected to the slot.

[0010] By adopting the above technical solution, it is easy to insert or remove the thermal paper from the slot.

[0011] Furthermore, an electric push rod is fixedly installed on the inner top wall of the testing box, and a mounting plate is fixedly connected to the output end of the electric push rod. A spring is fixedly installed under the mounting plate, and a pressure plate is fixedly connected to the lower end of the spring.

[0012] By adopting the above technical solution, the stability of thermal paper during the testing process can be improved.

[0013] Furthermore, a telescopic rod is fixedly installed between the mounting plate and the pressure plate, and the spring is sleeved on the outside of the telescopic rod.

[0014] By adopting the above technical solution, the spring can be prevented from shifting during deformation.

[0015] Furthermore, the testing platform is provided with two sets of hand grip slots, which are symmetrically arranged and connected to the placement slot.

[0016] By adopting the above technical solution, it is easier to place and retrieve the LED display screen.

[0017] Furthermore, two sets of sliding grooves are provided on the inner bottom of the testing box, and a sliding strip is slidably connected in each of the two sets of sliding grooves. The sliding strip is fixedly installed on the bottom of the testing platform.

[0018] By adopting the above technical solution, it is easy to place the testing station into the testing box.

[0019] The beneficial effects of this utility model are as follows: By using a detection box in conjunction with a detection platform, a placement slot, and thermal paper, the characteristic of thermal paper changing color when exposed to heat is utilized to display the LED beads corresponding to dark areas as non-emitting or weakly emitting light on the thermal paper, thus avoiding the need for staff to directly observe the emitting LED display screen with their eyes, reducing eye fatigue and lowering the rate of missed detection of dark spots. At the same time, the color rendering of thermal paper can detect weak dark spots, reducing the chance of missing weak dark spots due to the staff's subjective judgment of brightness.

[0020] By using a detection box with slots, a transparent plate, grid lines, and scale lines, areas on thermal paper that are not colored or have a light color are displayed on the grid lines. The coordinates of the dark spots can be obtained by reading the two sets of scale lines corresponding to the intersections on the grid lines, thus accurately locating the dark spots. Attached Figure Description

[0021] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0022] Figure 2 This is a cross-sectional structural diagram of the detection box in this utility model;

[0023] Figure 3 This is a schematic diagram of the structure of the testing station in this utility model;

[0024] Figure 4 This is a schematic diagram of the mounting plate and pressure plate in this utility model.

[0025] The following are labeled in the diagram: 1. Testing box; 2. Testing table; 3. Placement slot; 4. LED display screen; 5. Thermal paper; 6. Wiring slot; 7. Electric push rod; 8. Mounting plate; 9. Spring; 10. Pressure plate; 11. Telescopic rod; 12. Slot; 13. Mounting slot; 14. Transparent plate; 15. Grid lines; 16. Scale lines; 17. Pick-up slot; 18. Slide groove; 19. Slide bar; 20. Hand lock slot. Detailed Implementation

[0026] In the description of this utility model, it should be noted that the terms "front", "up", "down", "left", "right", "vertical", "horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] The following is in conjunction with the appendix Figure 1 - Appendix Figure 4 The present invention will be further described below.

[0029] To address the problems existing in the background technology, this application proposes the following technical solution: including a testing box 1, a testing platform 2 slidably connected in the testing box 1, a placement slot 3 opened on the testing platform 2, an LED display screen 4 placed in the placement slot 3, thermal paper 5 set on the LED display screen 4, a wire insertion slot 6 opened at the front end of the testing platform 2, the wire insertion slot 6 being connected to the interior of the placement slot 3, and a positioning mechanism set on the testing box 1.

[0030] Remove the testing platform 2 from the testing box 1, and place the LED display screen 4 to be tested in the placement slot 3. After placement, the LED display screen 4 should be flush with the upper surface of the testing platform 2. Then, lay the thermal paper 5 flat on the LED display screen 4. Next, move the testing platform 2 back into the testing box 1. Connect the external power cord to the LED display screen 4 through the wiring slot 6 to power on the LED display screen 4. After the LED display screen 4 is powered on, the LED beads corresponding to the dark areas do not emit light or emit light weakly. Therefore, the thermal paper 5 in that area receives less heat or no heat, resulting in the thermal paper... The coating does not undergo a chemical reaction or reacts very weakly, thus it does not develop color or develops a very light color. By observing the color development on the thermal paper 5, the location of dark spots can be located, avoiding the need for staff to directly observe the luminous LED display screen 4 with their eyes, reducing eye fatigue and thus lowering the rate of missed dark spot detection. At the same time, the color development of the thermal paper 5 can detect weak dark spots (such as pixels with brightness 30% lower than the normal value), reducing the possibility of missing weak dark spots due to staff's subjective judgment of brightness. The positioning mechanism accurately locates the position of dark spots, facilitating subsequent maintenance.

[0031] The working principle of thermal paper 5 is based on the chemical reaction of thermal dyes when heated. The surface of thermal paper 5 is coated with a thermal coating containing colorless dyes and color developers. When thermal paper 5 is subjected to heat, the colorless dyes and color developers react chemically, thereby producing a color change. In this application, thermal paper 5 uses British Thermax (TMC) 8-cell D-plate temperature paper (model 08STHERNGDD), which has the characteristics of obvious color development and suitable temperature resistance range.

[0032] To further explain, the positioning mechanism includes a slot 12 at the front end of the detection box 1, a mounting groove 13 on the detection box 1, and a transparent plate 14 fixedly mounted on the mounting groove 13. The transparent plate 14 is provided with grid lines 15, and two sets of scale lines 16 are fixedly provided on the detection box 1, with the two sets of scale lines 16 corresponding to the grid lines 15.

[0033] After color development, the thermal paper 5 is taken out from the testing station 2 and inserted into the slot 12. The thermal paper 5 in the slot 12 is observed from directly above the testing box 1 through the transparent plate 14. The transparent plate 14 is made of transparent glass or acrylic. The areas on the thermal paper 5 that are not colored or have a light color are displayed on the grid lines 15. The coordinates of the dark spots can be obtained by reading the two sets of scale lines 16 corresponding to the intersection points on the grid lines 15, so as to accurately locate the position of the dark spots.

[0034] Furthermore, the testing box 1 is provided with a retrieval slot 17, which is connected to the slot 12.

[0035] The size and position of the transparent plate 14 are the same as those of the LED display screen 4 on the testing table 2. When the thermal paper 5 is inserted into the slot 12, the thermal paper 5 can be fully inserted into the bottom of the slot 12 by using the pick-up slot 17. This ensures that the position of the dark spot when observing the thermal paper 5 through the grid line 15 is consistent with that on the LED display screen 4. When picking up the thermal paper 5 from the slot 12, the operator puts their finger into the pick-up slot 17 and uses the friction between the finger and the thermal paper 5 to move part of the thermal paper 5 out of the slot 12. Then, by pinching the protruding part, the thermal paper 5 is completely taken out of the slot 12. This makes it convenient to put the thermal paper 5 into or take it out of the slot 12, improving the ease of use of the device.

[0036] To further explain, an electric push rod 7 is fixedly installed on the inner top wall of the testing box 1. An installation plate 8 is fixedly connected to the output end of the electric push rod 7. A spring 9 is fixedly installed under the installation plate 8. A pressure plate 10 is fixedly connected to the lower end of the spring 9.

[0037] After the testing platform 2 is placed in the testing box 1, the electric push rod 7 drives the mounting plate 8 to move downward. The mounting plate 8 drives the pressure plate 10 to move downward through the spring 9. The pressure plate 10 contacts and presses the thermal paper 5 laid flat on the LED display screen 4, fixing the thermal paper 5 to the LED display screen 4 and improving the stability of the thermal paper 5 during the testing process. The spring 9 will deform during the fixing process to absorb energy and buffer the pressure applied by the pressure plate 10 to the thermal paper 5. At the same time, the pressure plate 10 is made of elastic material, which protects the thermal paper 5 and prevents it from being damaged due to excessive pressure. The electric push rod 7 can be a small DC electric push rod of model LT05.

[0038] Furthermore, a telescopic rod 11 is fixedly installed between the mounting plate 8 and the pressure plate 10, and a spring 9 is sleeved on the outside of the telescopic rod 11.

[0039] The telescopic rod 11 acts as a limit for the spring 9, which can prevent the spring 9 from shifting when deformed, ensuring the normal use of the spring 9 and improving the practicality of the device.

[0040] To further explain, the testing table 2 is provided with two sets of hand grip slots 20, which are symmetrically arranged and connected to the placement slot 3.

[0041] The two sets of hand-holding slots 20 are set to place the LED display screen 4 into the placement slot 3, and at the same time, it is easy to remove the LED display screen 4 from the placement slot 3 by hand after the test, which improves the convenience of using the test station 2.

[0042] Furthermore, two sets of sliding grooves 18 are provided on the inner bottom of the testing box 1, and sliding strips 19 are slidably connected in both sets of sliding grooves 18. The sliding strips 19 are fixedly installed on the bottom of the testing table 2.

[0043] The slider 19, in conjunction with the slide groove 18, guides and limits the movement of the testing table 2, allowing the testing table 2 to slide smoothly in the testing box 1. At the same time, when the testing table 2 and the slider 19 are pushed to the bottom of the slide groove 18, the position of the LED display screen 4 on the testing table 2 corresponds exactly to the transparent plate 14, improving the accuracy of the dark spot marking.

[0044] For specific operation, please refer to the following steps: Remove the testing platform 2 from the testing box 1, place the LED display screen 4 to be tested in the placement slot 3, ensuring the LED display screen 4 is flush with the upper surface of the testing platform 2. Then, lay the thermal paper 5 flat on the LED display screen 4. Next, move the testing platform 2 into the testing box 1. The electric push rod 7 will drive the mounting plate 8, spring 9, and pressure plate 10 to move downwards. The pressure plate 10 will contact and press the thermal paper 5 laid on the LED display screen 4, fixing the thermal paper 5 to the LED display screen 4. The external power cord will connect to the LED display screen 4 through the wiring slot 6 to power on the LED display screen 4. After the display screen 4 is powered on, the LED beads corresponding to the dark areas do not emit light or emit light weakly. Therefore, the thermal paper 5 in this area receives less heat or no heat, resulting in the thermal coating not undergoing a chemical reaction or a weak reaction, thus not developing color or developing a light color. After developing color, the thermal paper 5 is taken out from the test station 2 and inserted into the slot 12. The thermal paper 5 in the slot 12 is observed from directly above the test box 1 through the transparent plate 14. The areas on the thermal paper 5 that do not develop color or develop a light color are displayed on the grid lines 15. The coordinates of the dark point can be obtained by reading the two sets of scale lines 16 corresponding to the intersection points on the grid lines 15, thereby locating the position of the dark point.

[0045] All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art. In addition, the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here. The contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0046] Although embodiments of the present invention have been shown and described, the scope of the present invention will be defined by the appended claims and their equivalents for those skilled in the art.

Claims

1. A device for detecting dark spots in an LED display screen, characterized in that, The test box (1) includes a test platform (2) which is slidably connected to the test box (1). The test platform (2) has a placement slot (3) and an LED display screen (4) is placed in the placement slot (3). Thermal paper (5) is placed on the LED display screen (4). A wire insertion slot (6) is provided at the front end of the test platform (2). The wire insertion slot (6) is connected to the interior of the placement slot (3). The test box (1) is equipped with a positioning mechanism. 2.The LED display screen dark point detection device according to claim 1, characterized in that, The positioning mechanism includes a slot (12) at the front end of the detection box (1), a mounting groove (13) on the detection box (1), and a transparent plate (14) fixedly mounted on the mounting groove (13). The transparent plate (14) is provided with grid lines (15), and the detection box (1) is fixedly provided with two sets of scale lines (16), which correspond to the grid lines (15). 3.The LED display screen dark point detection device according to claim 2, characterized in that, The testing box (1) is provided with a retrieval slot (17), which is connected to the slot (12).

4. The LED display screen dark spot detection device according to claim 3, characterized in that, An electric push rod (7) is fixedly installed on the inner top wall of the detection box (1). An installation plate (8) is fixedly connected to the output end of the electric push rod (7). A spring (9) is fixedly installed under the installation plate (8). A pressure plate (10) is fixedly connected to the lower end of the spring (9).

5. The LED display screen dark spot detection device according to claim 4, characterized in that, A telescopic rod (11) is fixedly installed between the mounting plate (8) and the pressure plate (10), and the spring (9) is sleeved on the outside of the telescopic rod (11).

6. The LED display screen dark spot detection device according to claim 5, characterized in that, The testing platform (2) is provided with two sets of hand buckle slots (20), which are symmetrically arranged and connected to the placement slot (3).

7. The LED display screen dark spot detection device according to claim 6, characterized in that, The bottom of the test box (1) is provided with two sets of sliding grooves (18), and each set of sliding grooves (18) is slidably connected with a slide bar (19), which is fixedly installed at the bottom of the test table (2).

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