Optical detection device of liquid crystal display screen

Abstract

The invention relates to the technical field of optical detection, in particular to an optical detection device for a liquid crystal display screen, which comprises a working table and a detector which is positioned on the working table and is used for detecting the liquid crystal display screen, and a detection mechanism for improving a detection environment is arranged on the working table. The detection mechanism comprises an outer box and an inner box which are located on the workbench and mutually form a double-layer structure, and an exhaust fan for extracting gas in the outer box and the inner box is installed on one side of the outer box; the invention aims to provide the optical detection device of the liquid crystal display screen, residual dust impurities in gas in the inner box can be extracted along with the gas, the dust impurities in the inner box are prevented from influencing optical detection of the liquid crystal display screen, and meanwhile, the interior of the inner box can gradually tend to be in a sealed state; the influence of external temperature and humidity fluctuation on the liquid crystal response speed can be effectively avoided, dust is prevented from interfering with dead pixels and brightness uniformity detection, and the optical detection effect is effectively improved.

Description

Technical Field

[0001] The present invention relates to the technical field of optical detection, and particularly to an optical detection device for a liquid crystal display screen. Background Art

[0002] With the development of technology, life has become more and more advanced. Coupled with the advent of the digital age, it has promoted the booming development of high-tech industries. The industrial scale in the field of liquid crystal display and the fierce competition among international large manufacturers are expanding day by day. Liquid crystal display screens have many advantages such as high picture quality, small size, light weight, low driving voltage, and low power consumption. During the production and manufacturing process of display screens, in order to ensure product quality, it is usually necessary to detect liquid crystal display screens. Currently, during detection, generally, a detector irradiates the liquid crystal display screen and then identifies and discriminates. However, there will be dust and impurities in the detection environment, and these dust and impurities will cause misjudgment of dead pixels, thereby affecting the detection results. Summary of the Invention

[0003] The purpose of the present invention is to provide an optical detection device for a liquid crystal display screen, which can extract the residual dust and impurities in the gas inside the inner box along with the gas, avoiding the influence of the dust and impurities inside the inner box on the optical detection of the liquid crystal display screen. At the same time, it can make the inside of the inner box gradually tend to be in a sealed state, effectively avoiding the influence of external temperature and humidity fluctuations on the liquid crystal response speed, preventing dust from interfering with the detection of dead pixels and brightness uniformity, and effectively improving the optical detection effect.

[0004] To achieve the above purpose, the present invention provides the following technical solution: An optical detection device for a liquid crystal display screen, including a workbench and a detector located on the workbench for detecting the liquid crystal display screen. A detection mechanism for improving the detection environment is arranged on the workbench. The detection mechanism includes an outer box and an inner box that are located on the workbench and form a double-layer structure with each other. A suction fan for extracting the gas inside the outer box and the inner box is installed on one side of the outer box. A clamping frame for clamping the liquid crystal display screen slides inside the inner box. A suction cup for adsorbing and fixing to the inner wall of the inner box is arranged on one side of the clamping frame. A sliding door for closing the outer box and the inner box slides on one side of the outer box. An adjustment mechanism is arranged on one side of the outer box. The adjustment mechanism includes an air storage cylinder arranged on one side of the outer box. A first piston disk and a second piston disk slide inside the air storage cylinder. One side of the top of the air storage cylinder is communicated with the air outlet end of the suction fan. A telescopic rod is installed between the first piston disk and the second piston disk. One side of the bottom of the air storage cylinder is communicated with an air outlet pipe extending to the inside of the inner box. An air outlet disk is installed on one side of the clamping frame. When the suction cup adsorbs to the inner wall of the inner box, one end of the air outlet pipe is connected to the air outlet disk. A stepped through rod is installed above the first piston disk, and the through rod penetrates through the top of the air storage cylinder.

[0005] Preferably, the sliding door slides in a pull-out manner on the inner box, and one side of the sliding door fits and slides along the outer box and the inner box.

[0006] Preferably, a plurality of ventilation openings are formed in the side wall of the inner box.

[0007] Preferably, the clamping bracket is designed in an H shape, and clamping arms for clamping the liquid crystal display screen are installed on both sides of the clamping bracket.

[0008] Preferably, a guiding shaft is fixed inside the inner box, and the clamping bracket slides on the guiding shaft with damping.

[0009] Preferably, one side of the top of the air storage cylinder is communicated with an air delivery pipe, and one end of the air delivery pipe is connected to the air outlet end of the air extractor.

[0010] Preferably, a through opening for the through rod to pass through is formed in the top of the air storage cylinder.

[0011] Preferably, the first piston disc is located below the connection between the air delivery pipe and the air storage cylinder, and the second piston disc is located above the connection between the air storage cylinder and the air outlet pipe.

[0012] Preferably, the air outlet disc is located on one side of the clamping bracket, and a plurality of air outlet holes are formed in the air outlet disc.

[0013] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. The present invention uses the sliding door to enclose the outer box and the inner box, and then starts the air extractor. The air extractor extracts the gas inside the outer box and the inner box. In addition, through the ventilation openings formed on the outer side of the inner box, the gas inside the inner box can pass through the ventilation openings and be extracted by the air extractor. Similarly, the residual dust and impurities in the gas inside the inner box can be extracted along with the gas, avoiding the influence of the dust and impurities inside the inner box on the optical detection of the liquid crystal display screen. At the same time, by continuously extracting the gas inside the inner box and the outer box, the inside of the inner box gradually tends to be in a sealed state. The sealed environment can effectively avoid the influence of external temperature and humidity fluctuations on the liquid crystal response speed and prevent dust from interfering with the detection of dead pixels and brightness uniformity, and can effectively improve the optical detection effect.

[0014] 2. During the process of the inside of the inner box tending to be in a sealed environment in the present invention, since the air extractor transmits the extracted gas to the inside of the air storage cylinder through the air delivery pipe, the pressure inside the air storage cylinder becomes larger. Thus, the gas filled inside the air storage cylinder presses the first piston disc to move, and the first piston disc drives the through rod to move at this time. Refer to Figure 7As shown in the figure, due to the stepped design of the through rod, there is a gap between the top vent of the air storage cylinder and the through rod when the through rod starts to move. At this time, a small part of the gas filled into the air storage cylinder escapes through the gap, and most of the gas filled into the air storage cylinder converges inside the air storage cylinder, gradually increasing the internal pressure of the air storage cylinder, driving the first piston disk to gradually move downward. During the downward movement of the first piston disk, the telescopic rod is driven to expand and contract. Therefore, when the first piston disk initially moves downward, the position of the second piston disk remains unchanged. After the inside of the inner box tends to be in a sealed environment for a certain period of time, at this time, the telescopic rod has completed its expansion and contraction. When the first piston disk continues to move downward, it will push the second piston disk to move through the telescopic rod after it has completed its expansion and contraction. At this time, the second piston disk will discharge the inert gas at the bottom through the air outlet pipe into the inside of the inner box, thereby further improving the detection environment of the inner box.

[0015] 3. The present invention can make the detection environment of the liquid crystal display screen in a sealed state, and at the same time, can synchronously remove the influence of impurities in the gas on the detection. In addition, while changing the detection environment to a sealed environment, it can automatically add inert gas to the detection environment, and can select and adjust the detection environment according to the detection items of the liquid crystal display screen; while improving the detection flexibility, it can specifically improve its detection environment; improve the accuracy and quality of its optical detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is one of the partial structural schematic diagrams of the present invention; Figure 2 It is the overall structural schematic diagram of the present invention; Figure 3 It is the second of the partial structural schematic diagrams of the present invention; Figure 4 It is the partial cross-sectional view of the outer box of the present invention; Figure 5 It is the first of the partial cross-sectional views of the detection mechanism of the present invention; Figure 6 It is the second of the partial cross-sectional views of the detection mechanism of the present invention; Figure 7 It is the first of the partial cross-sectional views of the adjustment mechanism of the present invention; Figure 8 It is the second of the partial cross-sectional views of the adjustment mechanism of the present invention.

[0017] In the figure: 1, workbench; 2, detection mechanism; 21, outer box; 22, sliding door; 23, inner box; 24, clamping arm; 25, ventilation opening; 26, clamping rack; 27, suction cup; 28, guide shaft; 29, exhaust fan; 3, adjustment mechanism; 31, air storage cylinder; 32, gas transmission pipe; 33, first piston disk; 34, second piston disk; 35, telescopic rod; 36, air outlet disk; 37, air outlet pipe; 38, through rod; 4, detector. DETAILED DESCRIPTION OF THE INVENTION

[0018] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts fall within the scope of protection of the present invention.

[0019] The present invention provides an optical detection device for a liquid crystal display screen, including a workbench 1 and a detector 4 located on the workbench 1 for detecting the liquid crystal display screen. A detection mechanism 2 for improving the detection environment is provided on the workbench 1. The detection mechanism 2 includes an outer box 21 and an inner box 23 located on the workbench 1 and forming a double-layer structure with each other. A suction fan 29 for extracting the gas inside the outer box 21 and the inner box 23 is installed on one side of the outer box 21. A clamping frame 26 for clamping the liquid crystal display screen slides inside the inner box 23. A suction cup 27 for adsorbing the inner wall of the inner box 23 for fixation is provided on one side of the clamping frame 26. A sliding door 22 for closing the outer box 21 and the inner box 23 slides on one side of the outer box 21. The sliding door 22 slides in a pull-out manner on the inner box 23, and one side of the sliding door 22 fits and slides on the outer box 21 and the inner box 23. A plurality of ventilation openings 25 are provided on the side wall of the inner box 23. The clamping frame 26 is designed in an H shape, and clamping arms 24 for clamping the liquid crystal display screen are installed on both sides of the clamping frame 26. A guide shaft 28 is fixed inside the inner box 23, and the clamping frame 26 slides on the guide shaft 28 with damping. Refer to Figures 1 to 8 As shown, when performing optical detection on the liquid crystal display screen, the liquid crystal display screen is clamped by the clamping arms 24, and then the liquid crystal display screen slides to the side wall of the inner box 23 through the clamping frame 26 on the guide shaft 28, and then is adsorbed to the side wall of the inner box 23 by the suction cup 27 on the clamping frame 26, thereby further increasing the stability of the liquid crystal display screen. In addition, by the damping sliding of the clamping frame 26 on the guide shaft 28, the distance between the liquid crystal display screen and the detector 4 can also be adjusted, the detection distance can be adjusted, and the flexibility of detection can be improved. After determining the liquid crystal display screen, the outer box 21 and the inner box 23 are sealed by the sliding door 22. Then, the exhaust fan 29 is started to extract the gas inside the outer box 21 and the inner box 23. In addition, through the ventilation opening 25 provided on the outer side of the inner box 23, the gas inside the inner box 23 can pass through the ventilation opening 25 and be extracted by the exhaust fan 29. Similarly, the residual dust and impurities in the gas inside the inner box 23 can be extracted along with the gas, avoiding the influence of the dust and impurities inside the inner box 23 on the optical detection of the liquid crystal display screen. At the same time, by continuously extracting the gas inside the inner box 23 and the outer box 21, the inside of the inner box 23 can gradually tend to a sealed state. The sealed environment can effectively avoid the influence of external temperature and humidity fluctuations on the liquid crystal response speed, prevent dust from interfering with the detection of dead pixels, Mura, and brightness uniformity, and can effectively improve the optical detection effect; An adjustment mechanism 3 is provided on one side of the outer box 21. The adjustment mechanism 3 includes an air storage cylinder 31 provided on one side of the outer box 21. A first piston disc 33 and a second piston disc 34 are slidably arranged inside the air storage cylinder 31. One side of the top of the air storage cylinder 31 is communicated with the air outlet end of the exhaust fan 29. A telescopic rod 35 is installed between the first piston disc 33 and the second piston disc 34. One side of the bottom of the air storage cylinder 31 is communicated with an air outlet pipe 37 extending into the inner box 23. An air outlet disc 36 is installed on one side of the clamping frame 26. When the suction cup 27 adsorbs to the inner wall of the inner box 23, one end of the air outlet pipe 37 is connected to the air outlet disc 36; A stepped through rod 38 is installed above the first piston disc 33, and the through rod 38 penetrates through the top of the air storage cylinder 31; One side of the top of the air storage cylinder 31 is communicated with an air delivery pipe 32, and one end of the air delivery pipe 32 is connected to the air outlet end of the exhaust fan 29. A through hole for the through rod 38 to penetrate is provided on the top of the air storage cylinder 31. The first piston disc 33 is located below the connection between the air delivery pipe 32 and the air storage cylinder 31, and the second piston disc 34 is located above the connection between the air storage cylinder 31 and the air outlet pipe 37. The air outlet disc 36 is located on one side of the clamping frame 26, and a plurality of air outlet holes are provided on the air outlet disc 36; Refer to Figures 3 to 8 As shown, during the process of the inside of the inner box 23 tending to a sealed environment, since the exhaust fan 29 transmits the extracted gas to the inside of the air storage cylinder 31 through the air delivery pipe 32, the pressure inside the air storage cylinder 31 becomes larger. Therefore, the gas filled inside the air storage cylinder 31 will press the first piston disc 33 to move. At this time, the first piston disc 33 drives the through rod 38 to move. Refer to Figure 7As shown, due to the stepped design of the through rod 38, there is a gap between the top opening of the air storage cylinder 31 and the through rod 38 when the through rod 38 starts to move. At this time, a small part of the gas filled into the air storage cylinder 31 escapes through the gap, and most of the gas filled into the air storage cylinder 31 gathers inside the air storage cylinder 31, gradually increasing the internal pressure of the air storage cylinder 31, driving the first piston disk 33 to gradually move downward. During the downward movement of the first piston disk 33, the telescopic rod 35 is driven to expand and contract. Thus, when the first piston disk 33 moves downward initially, the position of the second piston disk 34 remains unchanged. After a certain period of time when the internal environment of the inner box 23 tends to be a sealed environment, at this time, the telescopic rod 35 has completed its expansion and contraction. When the first piston disk 33 continues to move downward, it will push the second piston disk 34 to move through the telescopic rod 35 after it has completed its expansion and contraction. At this time, the second piston disk 34 will discharge the inert gas at the bottom into the inner box 23 through the air outlet pipe 37, thereby further improving the detection environment of the inner box 23; it should be noted that different inert gases can be selected according to actual situations. For example: nitrogen N2, inert, preventing oxidation of LCD materials such as ITO electrodes, low cost, suitable for high-precision color / brightness detection; argon Ar is more inert than nitrogen, suitable for high-end OLED / Micro-LCD detection, with better thermal conductivity than nitrogen, contributing to heat dissipation and applicable to high-brightness screen tests; In addition, while the first piston disk 33 pushes the second piston disk 34 to move, after the first piston disk 33 drives the through rod 38 to move to a certain position, the through rod 38 will seal the opening on the air storage cylinder 31, so that the gas entering the air storage cylinder 31 will no longer escape. Thus, after filling the inert gas, it is prevented from being extracted into the air storage cylinder 31 and then escaping to the outside, which may affect environmental safety; at the same time, part of the inert gas can be collected and then processed accordingly, facilitating subsequent recycling and saving resources; by adopting the method of first extracting gas and then automatically filling the inert gas, on the one hand, the utilization rate of the inert gas is improved, and on the other hand, the manual filling operation can be saved, improving work efficiency and safety; A one-way valve is provided on the air outlet pipe 37 to prevent the change in the internal pressure of the inner box 23 from affecting the flow direction of the inert gas inside the air storage cylinder 31; In addition, after the suction cup 27 adsorbs to the side wall of the inner box 23, since the distance between the back of the liquid crystal display screen and the side wall of the inner box 23 is relatively close, at this time, the air outlet pipe 37 is inserted into the air outlet disk 36. Therefore, the inert gas inside the air outlet pipe 37 does not directly fill into the inner box 23, but first enters the inside of the air outlet disk 36 and then diffuses through the air outlet holes on the outside of the air outlet disk 36. Thus, it can be evenly diffused to the back of the liquid crystal display screen, which can improve the effect of the inert gas on the liquid crystal display screen; for example, when it is necessary to dissipate heat from the liquid crystal display screen, the effect is particularly prominent; By observing the displacement distance of the through rod 38, such as the markings on the through rod 38, the pressure changes inside the inner box 23 and the air storage cylinder 31 can be intuitively detected; reminding the inspectors to intervene and adjust in time to further improve the safety of the detection; and then the liquid crystal display screen is optically detected by the detector 4; Thereby, while the detection environment of the liquid crystal display screen can be in a sealed state, the influence of impurities in the gas on the detection can be removed synchronously. In addition, while changing the detection environment to a sealed environment, inert gas can be automatically added to the detection environment, and the detection environment can be adjusted selectively according to the detection items of the liquid crystal display screen; while improving the detection flexibility, the detection environment can be improved pertinently; and the accuracy and quality of the optical detection can be improved.

[0020] Working principle: When optically detecting the liquid crystal display screen, the liquid crystal display screen is clamped by the clamping arm 24, and then the liquid crystal display screen slides to the side wall of the inner box 23 through the clamping frame 26 on the guide shaft 28, and then is adsorbed to the side wall of the inner box 23 by the suction cup 27 on the clamping frame 26, thereby further increasing the stability of the liquid crystal display screen; the outer box 21 and the inner box 23 are closed by the sliding door 22, and then the exhaust fan 29 is started, and the air inside the outer box 21 and the inner box 23 is extracted by the exhaust fan 29. In addition, through the ventilation opening 25 opened on the outside of the inner box 23, the air inside the inner box 23 can pass through the ventilation opening 25 and be extracted by the exhaust fan 29. Similarly, the remaining dust and impurities in the air inside the inner box 23 can be extracted along with the air; During the process that the inside of the inner box 23 tends to be a sealed environment, since the exhaust fan 29 transmits the extracted gas to the inside of the air storage cylinder 31 through the air delivery pipe 32, the pressure inside the air storage cylinder 31 becomes larger. Thus, the gas filled inside the air storage cylinder 31 will press the first piston disc 33 to move, and at this time the first piston disc 33 drives the through rod 38 to move. Refer to Figure 7 As shown, due to the stepped design of the through rod 38, when the through rod 38 starts to move initially, there is a gap between the top opening of the air storage cylinder 31 and the through rod 38. At this time, a small part of the gas filled in the air storage cylinder 31 escapes through the gap, and most of the gas filled in the air storage cylinder 31 converges inside the air storage cylinder 31, gradually making the pressure inside the air storage cylinder 31 larger, driving the first piston disc 33 to gradually move downward. During the downward movement of the first piston disc 33, the telescopic rod 35 is driven to expand and contract. Thus, when the first piston disc 33 moves downward initially, the position of the second piston disc 34 remains unchanged. After a certain period of time when the inside of the inner box 23 tends to be a sealed environment, at this time the telescopic rod 35 has completed its expansion and contraction. When the first piston disc 33 continues to move downward at this time, it will push the second piston disc 34 to move through the telescopic rod 35 after its expansion and contraction is completed. At this time, the second piston disc 34 will discharge the inert gas at the bottom into the inside of the inner box 23 through the air outlet pipe 37; While the first piston disk 33 pushes the second piston disk 34 to move, after the first piston disk 33 drives the through rod 38 to move to a certain position, the through rod 38 will close the port on the air storage cylinder 31, so that the gas entering the interior of the air storage cylinder 31 will no longer escape. Thereby, after the inert gas is filled, it is prevented from being pumped into the interior of the air storage cylinder 31 and then escaping to the outside, which affects environmental safety.

[0021] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An optical detection device for a liquid crystal display screen, comprising a workbench (1) and a detector (4) located on the workbench (1) for detecting the liquid crystal display screen, characterized in that, A detection mechanism (2) for improving the detection environment is provided on the workbench (1). The detection mechanism (2) includes an outer box (21) and an inner box (23) located on the workbench (1) and forming a double-layer structure with each other. A suction fan (29) for extracting the gas inside the outer box (21) and the inner box (23) is installed on one side of the outer box (21). A clamping frame (26) for clamping a liquid crystal display screen slides inside the inner box (23). A suction cup (27) for adsorbing the inner wall of the inner box (23) to fix is provided on one side of the clamping frame (26). A sliding door (22) for closing the outer box (21) and the inner box (23) slides on one side of the outer box (21). An adjustment mechanism (3) is provided on one side of the outer box (21). The adjustment mechanism (3) includes an air storage cylinder (31) provided on one side of the outer box (21). A first piston disk (33) and a second piston disk (34) slide inside the air storage cylinder (31). One side of the top of the air storage cylinder (31) is communicated with the air outlet end of the suction fan (29). A telescopic rod (35) is installed between the first piston disk (33) and the second piston disk (34). One side of the bottom of the air storage cylinder (31) is communicated with an air outlet pipe (37) extending into the inner box (23). An air outlet disk (36) is installed on one side of the clamping frame (26). When the suction cup (27) adsorbs to the inner wall of the inner box (23), one end of the air outlet pipe (37) is connected to the air outlet disk (36). A stepped through rod (38) is installed above the first piston disk (33), and the through rod (38) penetrates through the top of the air storage cylinder (31).

2. The optical detection device for a liquid crystal display screen according to claim 1, characterized in that, The sliding door (22) slides in a pull-out manner on the inner box (23), and one side of the sliding door (22) fits and slides on the outer box (21) and the inner box (23).

3. An optical detection device for a liquid crystal display screen according to claim 1, characterized in that, A plurality of ventilation openings (25) are formed in the side wall of the inner box (23).

4. An optical detection device for a liquid crystal display screen according to claim 1, characterized in that, The clamping frame (26) is of H-shaped design, and clamping arms (24) for clamping a liquid crystal display screen are installed on both sides of the clamping frame (26).

5. An optical detection device for a liquid crystal display screen according to claim 1, characterized in that, A guide shaft (28) is fixed inside the inner box (23), and the clamping frame (26) slides on the guide shaft (28) with damping.

6. An optical detection device for a liquid crystal display screen according to claim 5, wherein One side of the top of the air storage cylinder (31) is communicated with an air delivery pipe (32), and one end of the air delivery pipe (32) is connected to the air outlet end of the suction fan (29).

7. An optical detection device for a liquid crystal display screen according to claim 1, characterized in that, A through opening for the through rod (38) to penetrate is formed in the top of the air storage cylinder (31).

8. An optical detection device for a liquid crystal display screen according to claim 1, characterized in that, The first piston disk (33) is located below the connection of the air delivery pipe (32) and the air storage cylinder (31), and the second piston disk (34) is located above the connection of the air storage cylinder (31) and the air outlet pipe (37).

9. An optical detection device for a liquid crystal display screen according to claim 1, characterized in that, The air outlet disk (36) is located on one side of the clamping frame (26), and a plurality of air outlet holes are formed in the air outlet disk (36).

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