Contact test device of liquid crystal display screen

Abstract

The invention discloses a contact test device of a liquid crystal display screen. The contact test device comprises a backlight box body, a placement panel is arranged on the backlight box body, fixing seats are arranged on the two sides of the placement panel, a second shielding plate is arranged at the top of the placement panel, a first shielding plate is slidably arranged on the side, opposite to the placement panel, of each fixing seat, the fixing seats are fixedly connected with the backlight box body, and the second shielding plates are slidably connected with the first shielding plates; the end, close to the second shielding plate, of the first shielding plate is provided with a transmission assembly, and the transmission assembly is in transmission fit with the second shielding plate. During use, after the display screen is placed in the groove, the first shielding plate slides in the direction of the display screen, so that the first shielding plate is attached to the side edge of the display screen; the first shielding plate drives the second shielding plate to move downwards through the transmission assembly to be attached to the top of the display screen, so that the interval between the display screen and the groove is blocked, and hard light is prevented from being emitted to the outside through the interval.

Description

Technical Field

[0001] The invention relates to the technical field of display screen production, in particular to a contact testing device for a liquid crystal display screen. Background Art

[0002] In the display production and processing line, in order to ensure the quality of the display, the display needs to be tested for light transmittance. Light transmittance testing is an important quality control step. This process usually requires the use of a backlight box to test the display. The light transmittance test is mainly to detect bright spots, dark spots, bad spots and other defects on the display under a high-brightness background. In some factories that do not apply fully automated production testing, when performing backlight testing on the display, the display is usually placed manually on the light source of the backlight box, and then the light source is started, and then observed with the naked eye, and unqualified products are removed.

[0003] Chinese Patent Publication No.: CN220438704U discloses a backlight detection device for a display screen backlight source, including a detection platform, a movable groove, a through hole, a fixing frame and a detection lens, wherein the through hole is opened at the top of the detection platform, the movable groove is opened at the bottom of the inner wall of the through hole, the fixing frame is fixedly connected to the bottom of the right side of the inner wall of the through hole, and the detection lens is fixedly connected to the top of the detection platform.

[0004] In the prior art, the size of the backlight box for backlight testing of display screens is fixed, but during the production process of display screens, the sizes of display screens may be different. Therefore, when testing the light transmittance of the display screen, it is usually necessary to adhere or remove corresponding shading materials on the backlight box to block excess light-transmitting areas or allow the blocked light source to leak out, so as to achieve the effect that the light source of the backlight box is completely illuminated on the display screen. It is rather cumbersome to adhere or remove corresponding shading materials according to the size of the display screen to adjust the light source to suit the display screen.

[0005] Therefore, it is necessary to provide a contact testing device for a liquid crystal display screen to solve the above technical problems. Summary of the invention

[0006] The object of the present invention is to provide a contact testing device for a liquid crystal display screen to solve the problems raised in the above background technology.

[0007] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: a contact testing device for a liquid crystal display screen, comprising a backlight box body; a placement panel is arranged on the backlight box body, fixed seats are arranged on both sides of the placement panel, a second baffle is arranged on the top of the placement panel, a first baffle is slidably arranged on a side of the fixed seat relative to the placement panel, the fixed seat is fixedly connected to the backlight box body, the second baffle is slidably connected to the first baffle, a transmission assembly is arranged at one end of the first baffle close to the second baffle, the transmission assembly cooperates with the second baffle, and when the first baffle moves toward the placement panel, the first baffle drives the second baffle to move toward the placement panel through the transmission assembly.

[0008] As a further solution of the present invention: a convex plate is provided at one end of the first baffle plate close to the placement panel, and the convex plate is slidably fitted with the top of the placement panel; a storage plate is fixedly provided at one end of the second baffle plate close to the placement panel, and the storage plate is slidably fitted with the top of the placement panel.

[0009] As a further solution of the present invention: a sliding groove is provided at the bottom of the storage plate, and extension plates are slidably connected at both ends of the sliding groove, a clamping block is fixedly connected to the end of the extension plate away from the storage plate, and a connecting groove slidably connected to the clamping block is provided at the end of the convex plate close to the extension plate, and the bottom of the extension plate is slidably fitted with the top of the placement panel.

[0010] As a further solution of the present invention: a sealing cloth is fixedly provided at the bottom of one end of the storage plate close to the first shielding plate, and the sealing cloth is arranged on one side of the storage plate close to the bottom of the backlight box body, and a card groove is provided on the side wall of the extension plate to slide with the sealing cloth.

[0011] As a further solution of the present invention: square openings are provided on both sides of the top of the second baffle plate, and a mounting frame is elastically connected in the square opening. The mounting frame is slidably connected to the inner wall of the second baffle plate, and a rotating roller is rotatably connected to the side wall of one end of the mounting frame close to the extension plate. The end of the sealing cloth away from the storage plate slides through the side wall of the second baffle plate and extends into the square opening, and the end of the sealing cloth extending into the square opening bypasses the mounting frame and is fixedly connected to the bottom of the inner wall of the square opening.

[0012] As a further solution of the present invention: a first trigger block is slidingly provided at the center of one side of the convex plate away from the fixed seat, a conveying groove is provided in the side wall of the first baffle plate, and the conveying groove extends to the convex plate, the first trigger block is slidably connected to the conveying groove, a sliding rod is fixedly provided at one end of the first baffle plate away from the second baffle plate, the sliding rod is provided on the side of the first baffle plate away from the placement panel, the conveying groove extends into the side wall of the sliding rod at one end, a placement groove connected to the conveying groove is provided at the bottom of the sliding rod, a limiting column is elastically connected in the placement groove, a limiting groove slidably adapted to the limiting column is provided on the side wall of the backlight box body, the top of the limiting groove is connected to the conveying groove, a vertical plate is fixedly provided at one end of the sliding rod away from the first baffle plate, and a first pressure relief hole connected to the end of the conveying groove is provided on the side wall of the vertical plate.

[0013] As a further solution of the present invention: a second trigger block is slidably connected to the center of the storage plate, and an end of the second trigger block close to the storage plate is fixedly connected to an airbag, and both sides of the end of the airbag away from the second trigger block are fixedly connected to the first air pipe, an air cavity is provided in the block, a convex column is elastically connected in the air cavity, and a circular groove slidably adapted to the convex column is provided on the top of the inner wall of the connecting groove, the end of the first air pipe away from the airbag is connected to the air cavity, and the end of the first air pipe extends to the vertical plate after passing through the air cavity, and a second pressure relief hole connected to the first air pipe is provided on the vertical plate, and valves are elastically connected to the first pressure relief hole and the second pressure relief hole, and the two groups of valves are fixedly connected to a square plate at one end away from the sliding rod.

[0014] As a further solution of the present invention: an auxiliary rod is fixedly provided at the bottom of the boss, a sealing plate is fixedly connected to the bottom of the auxiliary rod, the auxiliary rod and the sealing plate are both arranged in the air cavity, and the sealing plate is sealingly and slidably connected to the air cavity.

[0015] As a further solution of the present invention: the transmission assembly includes a rack; a second gear is transmission-matched between the opposite ends of the two groups of racks, the second gear is rotatably connected to the side wall of the backlight box body, the center top of the second gear is slidably connected to the first gear, a transmission groove is provided at the bottom center of the second baffle plate, and a tooth groove transmission-matched with the first gear is provided on one side of the transmission groove, a piston rod is fixedly connected to the bottom of the first gear, a circular plate sealingly and slidingly fitted with the inner wall of the second gear is provided at the bottom of the piston rod, and a through groove is provided at the bottom end of the piston rod, the center of the circular plate is rotatably connected to a second air pipe connected to the through groove, and the end of the second air pipe away from the circular plate is connected to the air cavity.

[0016] As a further solution of the present invention: a blocking cloth is fixedly connected to one end of the second shielding plate away from the storage plate, a winding box is arranged on the top of the backlight box body, and a winding roller for winding the blocking cloth is arranged in the winding box.

[0017] Compared with the prior art, the beneficial effect of the present invention is that when in use, after the display screen is placed in the groove, the first baffle plate is slid toward the direction of the display screen so that the first baffle plate fits with the side of the display screen. During this process, the first baffle plate drives the second baffle plate to move downward through the transmission assembly to fit with the top of the display screen, thereby blocking the gap between the display screen and the groove to prevent strong light from passing through the gap to the outside. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the front three-dimensional structure of the present invention.

[0019] Figure 2 It is a schematic diagram of the structure of the rack in the present invention.

[0020] Figure 3 For the present invention Figure 2 Schematic diagram of the structure at A in the middle.

[0021] Figure 4 It is a schematic diagram of the structure of the sealing cloth and the extension plate in the present invention.

[0022] Figure 5 It is a structural schematic diagram of a cross-section of the middle portion of the second shielding plate in the present invention.

[0023] Figure 6 For the present invention Figure 5 Schematic diagram of the structure at B in the figure.

[0024] Figure 7 It is a schematic diagram of the structure of the conveying trough in the present invention.

[0025] Figure 8 It is a schematic diagram of the structure of the limiting column and the limiting groove in the present invention.

[0026] Fig. 9 For the present invention Figure 8 Schematic diagram of the structure at C in the middle.

[0027] Fig.10 It is a schematic diagram of the structure of the airbag in the present invention.

[0028] Fig.11 It is a structural schematic diagram of the square opening in the present invention.

[0029] Fig.12 It is a schematic diagram of the structure of the mounting frame and the rotating roller in the present invention.

[0030] In the figure: 1. backlight box body; 2. placement panel; 3. fixing seat; 4. second baffle plate; 5. first baffle plate; 6. first trigger block; 7. slide bar; 8. take-up box; 9. cloth stop; 10. rack; 11. sealing cloth; 12. extension plate; 13. storage plate; 14. second trigger block; 15. airbag; 16. first air pipe; 17. first gear; 18. second gear; 19. connecting groove; 20. mounting frame; 21. transmission groove; 22. second air pipe; 23. piston rod; 24. conveying groove; 25. limiting groove; 26. limiting column; 27. convex column; 28. circular groove; 29. ​​block; 30. slot; 31. square mouth; 32. rotating roller; 33. square plate; 34. sealing plate. DETAILED DESCRIPTION

[0031] See also Figure 1-Figure 12 In an embodiment of the present invention, a contact testing device for a liquid crystal display screen includes a backlight box body 1, a placement panel 2 is arranged on the backlight box body 1, fixing seats 3 are arranged on both sides of the placement panel 2, a second baffle plate 4 is arranged on the top of the placement panel 2, a first baffle plate 5 is slidably arranged on one side of the fixing seat 3 relative to the placement panel 2, the fixing seat 3 is fixedly connected to the backlight box body 1, the second baffle plate 4 is slidably connected to the first baffle plate 5, a transmission assembly is arranged at one end of the first baffle plate 5 close to the second baffle plate 4, the transmission assembly cooperates with the second baffle plate 4 in transmission, when the first baffle plate 5 moves toward the placement panel 2, the first baffle plate 5 drives the second baffle plate 4 to move toward the placement panel 2 through the transmission assembly.

[0032] Preferably, the backlight box body 1 includes a light source to provide uniform and stable backlight to ensure that the display screen has sufficient brightness during detection. The backlight box body 1 is arranged in a right-angled trapezoidal shape, and the inclination angle of the bevel on the backlight box body 1 is convenient for people to place and observe the display screen. The placement panel 2 is embedded in the center of the bevel on the backlight box body 1, and a groove structure is arranged between the top of the bevel of the backlight box body 1 and the top of the placement panel 2. In this way, when in use, the display screen can be stably placed on the placement panel 2 through the groove. The placement panel 2 is usually transparent plexiglass or acrylic material to ensure good light transmittance and durability. A brightness switch button is also provided on the backlight box body 1 to facilitate the opening and closing of the light source. The backlight box body 1 is a conventional device in the prior art for light transmittance detection of display screens. Its specific related structure and corresponding working principle will not be described in detail here.

[0033] In specific use, after the display screen is placed on the placement panel 2, in the initial state, the two groups of first baffles 5 are located on the sides of the groove, and the second baffle 4 is located on the side of the top of the groove. At this time, the groove is in the maximum exposed state. After the display screen is placed in the groove, if there is a gap between the space exposed by the groove and the display screen, in order to ensure that when the light source is started to detect the light transmittance of the display screen, strong light will not pass through the gap to the outside, because after the strong light is emitted to the outside, it will affect the personnel's observation of the light transmittance of the display screen and may also cause damage to the personnel's eyes. Therefore, after the display screen is placed in the groove, the first baffle 5 is slid toward the direction of the display screen so that the first baffle 5 is fitted with the side of the display screen. In this process, the first baffle 5 drives the second baffle 4 to move downward and fit with the top of the display screen through the transmission assembly, thereby blocking the gap between the display screen and the groove to prevent strong light from passing through the gap to the outside. Then, the light source is started by the switch button to allow the light source to be emitted to the placement panel 2, thereby performing a light transmittance test on the display screen on the placement panel 2. Finally, after the test is completed, the light source is turned off and the display screen is removed to perform the test of the next display screen.

[0034] See also Figure 1-Figure 2 , Figure 4 , Figure 7 The top of the panel 2 is in the recess and the top of the panel 2 is in the recess, and the top of the panel 2 is in the recess.

[0035] See also Figure 2-Figure 4 , Figure 10-11Preferably, a slide groove is provided at the bottom of the storage plate 13, and the two ends of the slide groove are slidably connected with the extension plate 12 through springs. The end of the extension plate 12 away from the storage plate 13 is fixedly connected with a block 29, and the end of the convex plate close to the extension plate 12 is provided with a connecting groove 19 slidably connected to the block 29. The bottom of the extension plate 12 is slidably fitted with the top of the placement panel 2. In the initial state, the extension plate 12 protrudes from the slide groove under the action of the spring, and the bottom of the extension plate 12 is flush with the bottom of the storage plate 13, thereby achieving fit with the placement panel 2. During use, when the two groups of first shielding plates 5 move relatively close to each other, the two groups of first shielding plates 5 push the two groups of extension plates 12 to move and shrink into the slide groove, so that the convex plate, the extension plate 12, and the storage plate 13 are adapted to the size of the display screen, thereby providing a good light transmission detection environment.

[0036] Further, preferably, a sealing cloth 11 is fixedly provided at the bottom of one end of the storage plate 13 close to the first shielding plate 5, and the sealing cloth 11 is provided on one side of the storage plate 13 close to the bottom of the backlight box body 1, and a card slot 30 is provided on the side wall of the extension plate 12 to slide with the sealing cloth 11. When the sealing cloth 11 is adapted to the card slot 30, the bottom of the sealing cloth 11 slides with the placement panel 2, and the sealing cloth 11 slides with the convex plate, and the end of the sealing cloth 11 away from the storage plate 13 passes through the bottom of the extension plate 12 and the extension plate 12 in sequence. The plate 12 is close to one end of the convex plate, thereby avoiding the problem of light leakage caused by the extension plate 12 and the storage plate 13 being not flush with one side of the backlight box body 1. The top of the end of the sealing cloth 11 close to the extension plate 12 is a card strip set with a semicircular structure, and a semicircular groove adapted to the semicircular structure is set in the card groove 30, so as to limit the sealing cloth 11 on the extension plate 12, avoiding the problem of the sealing cloth 11 being offset during the movement of the extension plate 12, and the side of the sealing cloth 11 away from the card slot 30 is flush with the side wall of the storage plate 13.

[0037] See also Fig.12Preferably, square openings 31 are provided on both sides of the top of the second shielding plate 4, and a mounting frame 20 is elastically connected to the square opening 31 through a spring, and the mounting frame 20 is slidably connected to the inner wall of the second shielding plate 4, and a rotating roller 32 is rotatably connected to the side wall of the mounting frame 20 close to the extension plate 12. The end of the sealing cloth 11 away from the storage plate 13 slides through the side wall of the second shielding plate 4 and extends into the square opening 31, and the end of the sealing cloth 11 extending into the square opening 31 bypasses the mounting frame 20 and is fixedly connected to the bottom of the inner wall of the square opening 31. When in use, the mounting frame 20 is set in an "L" structure, and the corresponding spring on the mounting frame 20 is set on the side of the mounting frame 20 away from the extension plate 12. In the initial state, the mounting frame 20 is in a square The square opening 31 is close to one end of the extension plate 12. At this time, when the two groups of first baffle plates 5 move closer to each other, the first baffle plate 5 pushes the extension plate 12 to move into the slide groove. At this time, the sealing cloth 11 is in a relaxed state. At the same time, the spring corresponding to the mounting frame 20 pulls the mounting frame 20 to move in the square opening 31 in the direction away from the sealing cloth 11. Since the end of the sealing cloth 11 is fixed to the square opening 31, the movement of the mounting frame 20 will cause the extension plate 12 to move and shrink in the slide groove and the excess sealing cloth 11 is stored in the square opening 31, thereby keeping the sealing cloth 11 corresponding to the card slot 30 always in a taut state, avoiding the relaxation of the sealing cloth 11 to affect the movement of the extension plate 12 and the subsequent light transmittance detection of the display screen.

[0038] See also Figure 1-Figure 5 , Figure 7 Preferably, a first trigger block 6 is slidably provided at the center of one side of the convex plate away from the fixed seat 3, a conveying groove 24 is provided in the side wall of the first shielding plate 5, and the conveying groove 24 extends to the convex plate, the first trigger block 6 is slidably connected to the conveying groove 24, and the first trigger block 6 and the conveying groove 24 are elastically connected by a spring, and a sliding rod 7 is fixedly provided at one end of the first shielding plate 5 away from the second shielding plate 4, the sliding rod 7 is arranged on the side of the first shielding plate 5 away from the placement panel 2, the sliding rod 7 is elastically connected to the fixed seat 3 by a spring, and the conveying groove 24 is extended to the end of the first trigger block 6 In the side wall, a placement groove connected to the conveying groove 24 is provided at the bottom of the slide bar 7, and a limiting column 26 is elastically connected to the placement groove through a spring, and a limiting groove 25 slidably adapted to the limiting column 26 is provided on the side wall of the backlight box body 1, and a plurality of groups of limiting grooves 25 are arranged in a horizontal array on the backlight box body 1, and the top of the limiting groove 25 is connected to the conveying groove 24, and a vertical plate is fixedly provided at the end of the slide bar 7 away from the first baffle plate 5, and a first pressure relief hole connected to the end of the conveying groove 24 is provided on the side wall of the vertical plate; the springs corresponding to the first trigger block 6 and the slide bar 7 are not shown in the figure.

[0039] When in use, the first trigger block 6 is in the groove and in the initial state, the first trigger block 6 protrudes from the convex plate, the limiting column 26 shrinks in the placement groove, and the first pressure relief hole is in a closed state. In this way, after the display screen is placed in the groove, in order to make the first shielding plate 5 and the second shielding plate 4 adapt to the size of the display screen, the excess panel 2 is placed to block it. Therefore, after the display screen is placed, the sliding rod 7 is used to slide the first shielding plate 5 toward the display screen, thereby moving the first trigger block 6. When the first trigger block 6 is in contact with the side of the display screen, the first trigger block 6 then moves into the conveying groove 24. The first trigger block 6 moves so that the conveying groove 24 The moving gas in the conveying groove 24 is squeezed, and the limiting column 26 moves downward in the placement groove at this time, and adapts with a group of limiting grooves 25, so as to complete the limiting of the slide bar 7, and then limit the position of the first baffle plate 5, avoiding the problem that when the first baffle plate 5 is in contact with the side of the display screen, the slide bar 7 continues to slide to make the first baffle plate 5 move, causing the display screen to be squeezed and damaged; when all display screen inspections are completed, the pressure relief hole is opened to make the air pressure in the conveying groove 24 normal, and then the limiting column 26 and the first trigger block 6 are automatically reset elastically, and the slide bar 7 is also automatically reset, thereby driving the first baffle plate 5 to move and reset, ready for next use.

[0040] See also Figure 2-Figure 3 , Figure 8-Figure 9 Preferably, the center of the storage plate 13 is slidably connected to the second trigger block 14, the end of the second trigger block 14 close to the storage plate 13 is fixedly connected to the airbag 15, and the two sides of the end of the airbag 15 away from the second trigger block 14 are fixedly connected to the first air pipe 16, an air cavity is provided in the block 29, and a convex column 27 is elastically connected in the air cavity through a spring, and the convex column 27 is slidably arranged on the top of the block 29, and a circular groove 28 is provided on the top of the inner wall of the connecting groove 19 to slide with the convex column 27, and the circular groove 28 is arranged along the connecting groove There are multiple groups of arrays in the extension direction of 19, the end of the first air pipe 16 away from the airbag 15 passes through the extension plate 12 and the block 29 in sequence to be connected with the air cavity, and the end of the first air pipe 16 passes through the air cavity and also passes through the convex plate, the first baffle plate 5, and the side wall of the slide bar 7 to extend to the vertical plate, and a second pressure relief hole connected to the end of the first air pipe 16 is provided on the vertical plate above the first pressure relief hole, and valves are elastically connected to the first pressure relief hole and the second pressure relief hole, and the two groups of valves are fixedly connected to the square plate 33 at one end away from the slide bar 7.

[0041] Preferably, the bottom of the second trigger block 14 is flush with the bottom of the storage plate 13, and the two are sealed and slidably connected. The airbag 15 is an elastic telescopic structure, that is, after the airbag 15 is compressed, it can automatically elastically reset. In addition, the first air tube 16 is specifically divided into two groups. One group of first air tubes 16 connects the air cavity and the airbag 15, and the other group of first air tubes 16 extends from the side of the block 29 away from the airbag 15 to the second pressure relief hole at the end of the slide bar 7. Both groups of first air tubes 16 are connected to the air cavity. When in use, when the second trigger block 14 slides into the storage plate 13, the second trigger block 14 squeezes the airbag 15 to contract, so that the gas in the airbag 15 enters the first air tube Tube 16, and in the initial state, the top of the boss 27 does not protrude from the top of the block 29 under the action of the corresponding spring. At this time, the second pressure relief hole is in a blocked state, so the gas enters the air cavity to push the boss 27 to move upward and cooperate with a group of circular grooves 28 to limit the position of the block 29, thereby limiting the position of the storage plate 13 and the extension plate 12; when the square plate 33 is pressed in the direction of the slide rod 7, the slide rod 7 pushes the valve to open the second pressure relief hole, thereby connecting the first air pipe 16 with the outside, and then the boss 27 elastically moves to reset, releasing the restriction on the block 29, and then the airbag 15 and the second trigger block 14 move to reset.

[0042] Furthermore, preferably, an auxiliary rod is fixedly provided at the bottom of the boss 27, and a sealing plate 34 is fixedly connected to the bottom of the auxiliary rod. The auxiliary rod and the sealing plate 34 are both arranged in the air cavity, and the sealing plate 34 is sealingly and slidably connected to the air cavity. When the boss 27 moves upward, the auxiliary rod and the sealing plate 34 are driven to move upward. When the boss 27 is adapted to the corresponding circular groove 28, the sealing plate 34 is matched with a group of first air tube 16 ends of the corresponding airbag 15, thereby blocking the first air tube 16 and the air cavity. In this way, after the gas entering the air cavity pushes the boss 27 to move upward, it will not be automatically transported to the airbag 15 after the second trigger block 14 is not subjected to force. At the same time, the position of the second trigger block 14 is also restricted to avoid the airbag 15 from moving and resetting after adjustment, affecting the placement of the subsequent display screen.

[0043] See also Figure 1-Figure 10 Preferably, the transmission assembly includes a rack 10 fixedly arranged at one end of the first shielding plate 5 away from the slide rod 7; a second gear 18 is provided between the opposite ends of the two sets of racks 10 for transmission, and the second gear 18 is rotatably connected to the side wall of the backlight box body 1. There is a gap between the two sets of racks 10, and the teeth on the two sets of racks 10 are in a relative state, so that when one set of racks 10 moves, the second gear 18 enables the other set of racks 10 to move synchronously. Furthermore, preferably, the center top of the second gear 18 is slidably connected with the first gear 17, and a spring is arranged between the bottom of the first gear 17 and the second gear 18, and a transmission groove 21 is arranged at the bottom center of the second baffle plate 4, and a tooth groove is arranged on one side of the transmission groove 21 for transmission cooperation with the first gear 17. The size of the first gear 17 is larger than that of the second gear 18, so that when the second gear 18 rotates, it synchronously drives the first gear 17 to rotate, and the rotation of the first gear 17 moves the second baffle plate 4 through the tooth groove, and when the two groups of first baffle plates 5 are relatively close, the second baffle plate 4 moves downward through the cooperation of the rack 10, the second gear 18 and the first gear 17; a fixing ring is arranged in the middle of the second gear 18, and a spring is arranged on the side of the fixing ring corresponding to the first gear 17.

[0044] Furthermore, preferably, a piston rod 23 is fixedly connected to the bottom of the first gear 17, and a circular plate that is sealingly and slidably fitted with the inner wall of the second gear 18 is provided at the bottom of the piston rod 23, and a through groove is provided at the bottom end of the piston rod 23, and a second air pipe 22 that is connected to the through groove is rotatably connected to the center of the circular plate, and the end of the second air pipe 22 away from the circular plate passes through the side wall of the backlight box body 1 and the block 29 to be connected to the air cavity, and the piston rod 23 is sealingly and slidably fitted with a fixing ring, and a hole that connects the through groove and the inside of the second gear 18 is provided on the side wall of the piston rod 23. In this way, when in use, when the airbag 15 is compressed, the gas in the airbag 15 enters the second air pipe 22 through the first air pipe 16 and the air cavity, and then the gas enters the through groove and the second gear 18. When the air pressure increases, the piston rod 23 moves in the direction away from the fixing ring, thereby driving the first gear 17 to separate from the tooth groove.

[0045] When in use, when the first baffle plate 5 is retracted in the fixing seat 3, the second trigger block 14 protrudes out of the side wall of the receiving plate 13, the convex column 27 is retracted in the air cavity, the first gear 17 is meshed with the tooth groove, and the second pressure relief hole is in a blocked state; when it is necessary to perform light transmittance detection on the display screen, the display screen is placed on the placement panel 2, and then the first baffle plate 5 is slid in the direction of the display screen. The movement of the first baffle plate 5 causes the rack 10 to move, and then drives another group of first baffle plates 5 to move toward the display screen synchronously through the second gear 18. The rotation of the second gear 18 drives the first gear 17 to rotate at the same time. The rotation of the first gear 17 passes through the tooth groove to move the second baffle plate 4 toward the display screen. When the first trigger block 6 and the second trigger block 14 are in contact with the display screen and are pushed to retract in the convex plate and the receiving plate 13 respectively, the adaptation work to the size of the display screen is completed, and the operation is simple. During this process, the second trigger block 14 moves and retracts in the receiving plate 13, so that the airbag 15 is squeezed, and then the gas in the airbag 15 is transported to the air cavity through the first air pipe 16, so that the air pressure in the air cavity increases, and the convex column 27 moves upward to cooperate with the circular groove 28 to limit the position of the block 29, and then the position of the extension plate 12 and the storage plate 13 is limited, and then the piston rod 23 is moved downward by the action of the second air pipe 22, so that the first gear 17 is separated from the tooth groove, so as not to hinder the continued movement of the first baffle plate 5 to adapt to the size of the display screen; when it is necessary to move and reset the first baffle plate 5 and the second baffle plate 4, press the square plate 33 to make the second pressure relief hole and the first pressure relief hole connected to the outside, so that the air pressure in the air cavity returns to normal, and then the convex column 27 moves and resets, and at the same time, the first gear 17 moves and resets and cooperates with the tooth groove again, and then the first baffle plate 5 moves and resets, and the cooperation of the rack 10 and the second gear 18 makes the second baffle plate 4 move and reset.

[0046] See also Figure 1Preferably, one end of the second baffle plate 4 away from the storage plate 13 is fixedly connected to a blocking cloth 9, a winding box 8 is provided on the top of the backlight box body 1, and a winding roller for winding the blocking cloth 9 is provided in the winding box 8, and a coil spring is provided between the winding roller and the winding box 8, and the automatic winding of the blocking cloth 9 is realized by the coil spring, and a pressing block is slidingly provided on the top of the second baffle plate 4, the pressing block is not shown in the figure, and the length of the pressing block matches the length of the transmission groove 21. When in use, when the pressing block is driven to move toward the second baffle plate 4, the pressing block will cause the first gear 17 to move toward the second gear 18 and separate from the tooth groove, and then it can be moved to The sliding rod 7 slides the second baffle plate 4, and the second baffle plate 4 moves to pull the blocking cloth 9 to extend out from the winding box 8. Before this, the first trigger block 6 needs to be pressed in the direction of the first baffle plate 5 to limit the position of the first baffle plate 5. When the second baffle plate 4 moves to make the second trigger block 14 cooperate with the bottom edge of the groove, the second trigger block 14 squeezes the airbag 15 so that the protruding column 27 limits the position of the card block 29, thereby achieving the shielding of the placement panel 2 through the cooperation of the second baffle plate 4 and the blocking cloth 9, thereby avoiding dust or impurities falling on the placement panel 2 due to long-term non-use, affecting the subsequent testing of the display screen.

Claims

1. A contact test device for a liquid crystal display screen, comprising a backlight box body; characterized in that: A placement panel is provided on the backlight box body, fixed seats are provided on both sides of the placement panel, a second baffle is provided on the top of the placement panel, a first baffle is slidably provided on a side of the fixed seat relative to the placement panel, the fixed seat is fixedly connected to the backlight box body, the second baffle is slidably connected to the first baffle, a transmission assembly is provided at one end of the first baffle close to the second baffle, the transmission assembly cooperates with the second baffle, and when the first baffle moves toward the placement panel, the first baffle drives the second baffle to move toward the placement panel through the transmission assembly.

2. A contact testing device for a liquid crystal display screen according to claim 1, characterized in that: A convex plate is provided at one end of the first shielding plate close to the placement panel, and the convex plate is slidably fitted with the top of the placement panel. A storage plate is fixedly provided at one end of the second shielding plate close to the placement panel, and the storage plate is slidably fitted with the top of the placement panel.

3. A contact testing device for a liquid crystal display screen according to claim 2, characterized in that: A sliding groove is provided at the bottom of the storage plate, and extension plates are slidably connected at both ends of the sliding groove. A clamping block is fixedly connected to the end of the extension plate away from the storage plate, and a connecting groove slidably connected to the clamping block is provided at the end of the convex plate close to the extension plate. The bottom of the extension plate is slidably fitted with the top of the placement panel.

4. A contact testing device for a liquid crystal display screen according to claim 3, characterized in that: A sealing cloth is fixedly arranged at the bottom of one end of the storage plate close to the first shielding plate, and the sealing cloth is arranged on one side of the storage plate close to the bottom of the backlight box body, and a slot for slidingly fitting with the sealing cloth is arranged on the side wall of the extension plate.

5. A contact testing device for a liquid crystal display screen according to claim 4, characterized in that: Square openings are provided on both sides of the top of the second shielding plate, and a mounting frame is elastically connected in the square opening. The mounting frame is slidably connected to the inner wall of the second shielding plate, and a rotating roller is rotatably connected to the side wall of one end of the mounting frame close to the extension plate. The end of the sealing cloth away from the storage plate slides through the side wall of the second shielding plate and extends into the square opening, and the end of the sealing cloth extending into the square opening bypasses the mounting frame and is fixedly connected to the bottom of the inner wall of the square opening.

6. A contact testing device for a liquid crystal display screen according to claim 3, characterized in that: A first trigger block is slidably provided at the center of one side of the convex plate away from the fixed seat, a conveying groove is provided in the side wall of the first baffle plate, and the conveying groove extends to the convex plate, the first trigger block is slidably connected to the conveying groove, and a sliding rod is fixedly provided at one end of the first baffle plate away from the second baffle plate, the sliding rod is arranged on the side of the first baffle plate away from the placement panel, and the conveying groove extends into the side wall of the sliding rod at one end, a placement groove connected to the conveying groove is provided at the bottom of the sliding rod, a limiting column is elastically connected in the placement groove, a limiting groove slidably adapted to the limiting column is provided on the side wall of the backlight box body, the top of the limiting groove is connected to the conveying groove, and a vertical plate is fixedly provided at one end of the sliding rod away from the first baffle plate, and a first pressure relief hole connected to the end of the conveying groove is provided on the side wall of the vertical plate.

7. A contact testing device for a liquid crystal display screen according to claim 6, characterized in that: A second trigger block is slidably connected to the center of the storage plate, and an end of the second trigger block close to the storage plate is fixedly connected to an airbag, and both sides of an end of the airbag away from the second trigger block are fixedly connected to the first air pipe, an air cavity is provided in the block, a convex column is elastically connected in the air cavity, and a circular groove slidably adapted to the convex column is provided on the top of the inner wall of the connecting groove, the end of the first air pipe away from the airbag is connected to the air cavity, and the end of the first air pipe extends to the vertical plate after passing through the air cavity, and a second pressure relief hole connected to the first air pipe is provided on the vertical plate, and valves are elastically connected to the first pressure relief hole and the second pressure relief hole, and the two groups of valves are fixedly connected to a square plate at one end away from the sliding rod.

8. A contact testing device for a liquid crystal display screen according to claim 7, characterized in that: An auxiliary rod is fixedly arranged at the bottom of the convex column, and a sealing plate is fixedly connected to the bottom of the auxiliary rod. The auxiliary rod and the sealing plate are both arranged in the air cavity, and the sealing plate is sealingly and slidably connected to the air cavity.

9. A contact testing device for a liquid crystal display screen according to claim 7, characterized in that: The transmission assembly includes a rack; a second gear is transmission-matched between the opposite ends of the two sets of racks, the second gear is rotatably connected to the side wall of the backlight box body, the central top of the second gear is slidably connected to the first gear, a transmission groove is provided at the bottom center of the second baffle plate, and a tooth groove transmission-matched with the first gear is provided on one side of the transmission groove, a piston rod is fixedly connected to the bottom of the first gear, a circular plate sealingly and slidingly fitted with the inner wall of the second gear is provided at the bottom of the piston rod, and a through groove is provided at the bottom end of the piston rod, the center of the circular plate is rotatably connected to a second air pipe connected to the through groove, and the end of the second air pipe away from the circular plate is connected to the air cavity.

10. The contact testing device for a liquid crystal display screen according to claim 1, characterized in that: One end of the second shielding plate away from the storage plate is fixedly connected with a blocking cloth, and a winding box is arranged on the top of the backlight box body, and a winding roller for winding the blocking cloth is arranged in the winding box.

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