A liquid crystal display screen production line backlight brightness uniformity detection device

Abstract

This invention discloses a backlight brightness uniformity testing device for a liquid crystal display production line, relating to the field of backlight brightness testing technology. The device includes a base with a dark chamber mounted on top. A support platform is fixedly connected to the center of the bottom of the base. A carrier platform is fixedly connected to the outer surface of the rotating platform. A placement and positioning mechanism is installed inside the carrier platform. A cleaning and testing mechanism is installed inside the dark chamber. A fixing block is fixedly connected to the center of the bottom of the carrier platform. Positioning components are installed around the placement plate inside the carrier platform. During loading and unloading, the placement plate is in a high position, and the positioning components are fully open without structural obstruction, making screen placement and unloading convenient and labor-saving. No manual adjustment is required, ensuring precise alignment between the screen center and the optical axis of the imaging brightness meter. This effectively eliminates misjudgments of local bright spots and dark spots caused by dust on the screen surface, improving the detection accuracy of backlight brightness uniformity.

Description

Technical Field

[0001] This invention relates to the field of backlight brightness detection technology, specifically to a backlight brightness uniformity detection device for a liquid crystal display production line. Background Technology

[0002] With the rapid development of LCD technology, LCD screens are widely used in consumer electronics, automotive displays, medical equipment, industrial control, and other fields. The brightness uniformity of the backlight module is one of the core indicators for measuring the optical quality of the display screen, directly affecting the visual experience and color consistency of the displayed image. In the production and quality control of the display screen, it is necessary to use a dedicated testing device to collect the brightness distribution of the screen under a full white field, calculate the global and regional uniformity, and identify optical defects such as dark spots and bright lines in order to screen qualified products and guide process optimization. Most of the current mainstream backlight brightness uniformity testing devices adopt a dark box structure, which isolates external stray light through a sealed light-shielding cavity. An imaging luminance meter is installed inside the cavity. After the screen is driven to display a full white image, the imaging luminance meter collects the brightness information of the screen surface and completes the uniformity calculation.

[0003] However, existing backlight brightness uniformity testing devices require the device to be tested to be placed in a carrier and sent into a darkroom for testing during the feeding process. The entire conveying process is not smooth and is inconvenient to handle. It is also not easy to quickly and accurately send the screen into the corresponding testing station inside the darkroom. Problems such as placement offset and alignment deviation are prone to occur, resulting in misalignment of the imaging acquisition area and fluctuation of brightness measurement data. This makes it difficult to meet the high-efficiency testing requirements of mass production lines. At the same time, dust easily adheres to the surface of the display screen during the transfer and handling process. Most existing devices require manual wiping of the screen surface before it is placed in the box, which not only increases the process time but also interferes with the accuracy of uniformity testing.

[0004] To address the aforementioned issues, innovative designs are urgently needed based on existing approaches. Summary of the Invention

[0005] The purpose of this invention is to provide a backlight brightness uniformity detection device for a liquid crystal display production line to solve the problems mentioned in the background. The technical solution of this invention addresses the problem that the existing technical solutions are too simplistic and provides a solution that is significantly different from the existing technology.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a backlight brightness uniformity testing device for a liquid crystal display production line, comprising a device base, a testing dark chamber installed on the top of the device base, a support platform fixedly connected to the middle position of the bottom of the device base, a rotating platform rotatably connected to the top of the support platform, a bearing platform fixedly connected to the outer surface of the rotating platform, a placement and positioning mechanism installed inside the bearing platform, and a cleaning and testing mechanism installed inside the testing dark chamber. The placement and positioning mechanism includes a placement plate that slides within a groove at the top of the support platform. A fixing block is fixedly connected to the center of the bottom of the support platform. A sliding rod is fixedly connected to the outer surface of the fixing block. The other end of the sliding rod is fixedly connected to the inner wall of the support platform. A sliding block is slidably connected to the surface of the sliding rod. An offset rod is rotatably connected to the side end of the sliding block. The other end of the offset rod is rotatably connected to the bottom end of the placement plate. A pushing rod is fixedly connected to the top of the sliding block. A first abutting block is fixedly connected to the end of the pushing rod away from the offset rod. Positioning components are installed around the placement plate inside the support platform.

[0007] Preferably, the positioning component includes a sliding plate that slides within the outer cavity of the top of the support platform, a limiting plate is fixedly connected to the back end of the sliding plate, an abutment rod is provided on the inner side of the limiting plate, guide rods are fixedly connected to both sides of the abutment rod, a guide groove is provided on the surface of the limiting plate, and an elastic contact is fixedly connected to the front surface of the sliding plate.

[0008] Preferably, the cleaning and detection mechanism includes a light-shielding box installed in the dark detection chamber. An imaging brightness meter is installed at the top inside the light-shielding box, and a cleaning scraper is provided at the bottom inside the light-shielding box. A pull rod is fixedly connected to the side of the cleaning scraper away from the light-shielding box. The pull rod extends out of both sides of the light-shielding box and is fixedly connected to a second abutment block. A horizontal bar is vertically limited and slidable on both sides of the light-shielding box. A reset rod is fixedly connected to the front and rear sides of the second abutment block. Receiving grooves are opened on the inner walls of both sides of the light-shielding box corresponding to the cleaning scraper.

[0009] Preferably, a traction rod is fixedly connected to the middle of the bottom end of the placement plate, and a protrusion is fixedly connected to the outer surface of the support base. The protrusion is formed into a spiral structure with the beginning and end connected along the outer surface of the support base. The bottom end of the protrusion is the side closest to the bottom of the detection dark chamber. The traction rod is set into an "L" shape. The end of the traction rod away from the placement plate passes through the fixed block and extends out of the bottom of the support platform. The extension end of the traction rod is fitted and slidably on the surface of the protrusion.

[0010] Preferably, four sets of sliding rods are evenly arranged circumferentially on the outer surface of the fixed block, and a first spring is sleeved on the surface of the four sets of sliding rods. The other end of the first spring is fixedly connected to the back end of the sliding block.

[0011] Preferably, the contact surface of the first contact block is configured as an inclined structure, the bottom of the contact rod abuts against the contact surface of the first contact block, and a second spring is sleeved on the surface of the contact rod.

[0012] Preferably, two sets of limiting plates are provided at the back end of the sliding plate, the guide groove is opened on the surface of the limiting plate in an inclined structure, the guide rod is limited and slids within the guide groove, and several sets of elastic contacts are provided on the front surface of the sliding plate.

[0013] Preferably, four sets of bearing platforms are evenly arranged circumferentially on the outer surface of the rotating platform, pressure sensors are installed on the top side wall of the bearing platform, and the rotating platform is driven by a drive motor at the bottom of the device base.

[0014] Preferably, the contact surface of the second contact block is set as an inclined structure, the light shield is driven by a first electric push rod installed on the top of the detection dark chamber, the end of the crossbar abuts against the contact surface of the second contact block, the crossbar is driven by a second electric push rod installed on both sides of the light shield, the second electric push rod is connected to the pressure sensor by an electrical signal, and the reset rods are connected by a third spring.

[0015] Compared with the prior art, the beneficial effects of the present invention are: 1. This invention comprises a placement plate, a fixing block, a sliding rod, a sliding block, an offset rod, a pushing rod, a first contact block, and a positioning component. Through a rotary multi-station circulating structure combined with spiral protrusions connected end-to-end, it drives the lifting and lowering of the placement plate and features a central clamping linkage design. This effectively solves the problems of poor screen conveying, inconvenient placement and retrieval operations, and insufficient alignment accuracy. Four sets of support platforms rotate intermittently with the rotating table, allowing screen placement during testing. This ensures a smooth overall testing process and significantly improves the testing rhythm of the production line. During loading and unloading, the placement plate is at a high position, and the positioning component is fully open without structural obstruction, making screen placement and retrieval convenient and labor-saving. During the descent of the placement plate, the four positioning components are automatically centered and clamped through pure mechanical linkage, eliminating the need for manual alignment adjustments. This ensures precise alignment between the screen center and the optical axis of the imaging brightness meter, avoiding misalignment in image acquisition and fluctuations in brightness measurement data caused by placement offset.

[0016] 2. This invention includes a light-shielding box, an imaging brightness meter, a cleaning scraper, a pull rod, a second contact block, and a crossbar. A second electric push rod drives the crossbar to slide vertically downwards along the side wall of the light-shielding box. The end of the crossbar abuts against the inclined surface of the second contact block, pushing the two second contact blocks on either side to move towards each other. The pull rod drives the cleaning scraper to simultaneously scrape from the center to both sides along the upper surface of the screen. The cleaning scraper automatically cleans the surface dust, eliminating the extra step of manual wiping before the screen is placed in the box. After cleaning, the scraper is stored in a side receiving groove, completely avoiding the detection light path. This effectively eliminates misjudgments of local bright spots and dark spots caused by surface dust, improving the detection accuracy of backlight brightness uniformity. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention; Figure 2 This is a frontal cross-sectional view of the overall structure of the present invention; Figure 3 This is a top sectional view of the internal structure of the base of the device of the present invention; Figure 4 For the present invention Figure 3 Enlarged schematic diagram of the structure at point A in the middle; Figure 5 This is a side sectional view of the support platform structure of the present invention; Figure 6 For the present invention Figure 5 Enlarged schematic diagram of the structure at point B; Figure 7 This is a top-view cross-sectional view of the internal structure of the darkroom for testing according to the present invention; Figure 8 This is a schematic diagram of the sliding plate, limiting plate, abutment rod, and guide rod of the present invention.

[0018] In the diagram: 1. Device base; 2. Detection dark chamber; 3. Support base; 4. Rotating table; 5. Bearing platform; 61. Placement plate; 62. Fixing block; 63. Sliding rod; 64. Sliding block; 65. Offset rod; 66. Push rod; 67. First contact block; 681. Sliding plate; 682. Limiting plate; 683. Contact rod; 684. Guide rod; 685. Guide groove; 686. Elastic contact; 71. Light shield; 72. Imaging brightness meter; 73. Cleaning scraper; 74. Pull rod; 75. Second contact block; 76. Crossbar; 77. Reset rod; 8. Traction rod; 9. Protrusion. Detailed Implementation

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Please see Figures 1-8 The present invention provides a technical solution: a backlight brightness uniformity detection device for a liquid crystal display production line, comprising a device base 1, a detection dark chamber 2 installed on the top of the device base 1, a support base 3 fixedly connected to the middle position of the bottom of the device base 1, a rotating platform 4 rotatably connected to the top of the support base 3, a bearing platform 5 fixedly connected to the outer surface of the rotating platform 4, four sets of bearing platforms 5 evenly arranged circumferentially on the outer surface of the rotating platform 4, a pressure sensor installed on the top side wall of the bearing platform 5, the rotating platform 4 being driven by a drive motor at the bottom of the device base 1, a placement and positioning mechanism installed inside the bearing platform 5, and a cleaning and detection mechanism installed inside the detection dark chamber 2; The placement and positioning mechanism includes a placement plate 61 that slides within a groove at the top of the support platform 5, a fixing block 62 that is fixedly connected to the center of the bottom of the support platform 5, a sliding rod 63 that is fixedly connected to the outer surface of the fixing block 62, the other end of the sliding rod 63 that is fixedly connected to the inner wall of the support platform 5, a sliding block 64 that is slidably connected to the surface of the sliding rod 63, an offset rod 65 that is rotatably connected to the side end of the sliding block 64, the other end of the offset rod 65 that is rotatably connected to the bottom end of the placement plate 61, a push rod 66 that is fixedly connected to the top of the sliding block 64, a first abutting block 67 that is fixedly connected to the end of the push rod 66 away from the offset rod 65, the abutting surface of the first abutting block 67 being set as an inclined structure, the bottom of the abutting rod 683 abutting against the abutting surface of the first abutting block 67, a second spring that is sleeved on the surface of the abutting rod 683, and positioning components that are installed around the placement plate 61 inside the support platform 5. A traction rod 8 is fixedly connected to the middle of the bottom end of the placement plate 61. A protrusion 9 is fixedly connected to the outer surface of the support base 3. The protrusion 9 is opened in a spiral structure with the head and tail connected along the outer surface of the support base 3. The side of the protrusion 9 closest to the bottom of the detection dark chamber 2 is the bottom end. The traction rod 8 is set in an "L" shape. The end of the traction rod 8 away from the placement plate 61 passes through the fixed block 62 and extends out of the bottom of the support platform 5. The extended end of the traction rod 8 is fitted and slids on the surface of the protrusion 9. The traction rod 8 extends from one end of the support platform 5 and slides along the surface of the spiral protrusion 9 connected end to end around the outer periphery of the support base 3. The height of the protrusion 9 gradually decreases along the rotation direction of the rotating platform 4, and the traction rod 8 moves downward accordingly, causing the placement plate 61 to descend vertically along the groove at the top of the support platform 5. During the descent of the placement plate 61, the downward push offset rod 65 deflects and pushes the sliding block 64 outward, causing the sliding block 64 to slide along the slide rod 63 away from the fixed block 62, compressing the first spring sleeved on the slide rod 63. The movement of the sliding block 64 synchronously drives the push rod 66 and the first abutment block 67 to move outward from the support platform 5.

[0021] In one embodiment of the present invention, the positioning component includes a sliding plate 681 that slides within the outer cavity of the top of the support platform 5. A limiting plate 682 is fixedly connected to the back end of the sliding plate 681. An abutment rod 683 is provided on the inner side of the limiting plate 682. Guide rods 684 are fixedly connected to both sides of the abutment rod 683. A guide groove 685 is provided on the surface of the limiting plate 682. An elastic contact 686 is fixedly connected to the front surface of the sliding plate 681. Two sets of limiting plates 682 are provided at the back end of the sliding plate 681. The guide groove 685 is provided on the surface of the limiting plate 682 in an inclined structure. The guide rods 684 slide within the guide groove 685. Several sets of elastic contacts 686 are provided on the front surface of the sliding plate 681. The inclined surface at the top of the first contact block 67 abuts against the contact rod 683, forcing the contact rod 683 to move vertically and compressing the second spring sleeved on the surface of the contact rod 683. When the contact rod 683 moves upward, the guide rods 684 on both sides of the contact rod 683 slide inside the inclined guide groove 685 opened on the surface of the limiting plate 682. Under the guidance of the inclined surface of the guide groove 685, the limiting plates 682 on both sides drive the sliding plate 681 to move synchronously towards the center of the placement plate 61. The elastic contact 686 on the surface of the sliding plate 681 gradually abuts against the side of the LCD screen. As the placement plate 61 continues to descend, the screen body is finally automatically centered and clamped.

[0022] In one embodiment of the present invention, the cleaning and detection mechanism includes a light-shielding box 71 disposed within a darkroom 2. An imaging brightness meter 72 is installed at the top of the light-shielding box 71, and a cleaning scraper 73 is disposed at the bottom of the light-shielding box 71. A pulling rod 74 is fixedly connected to the side of the cleaning scraper 73 furthest away from it. The pulling rod 74 extends out of both sides of the light-shielding box 71 and is fixedly connected to a second abutment block 75. A horizontal bar 76 is vertically limited and slides along the two sides of the light-shielding box 71. The second abutment block 75 is fixedly connected to the front and rear sides. The reset rod 77 and the inner walls of the light shield 71 on both sides are provided with receiving grooves corresponding to the cleaning scraper 73. The contact surface of the second contact block 75 is set with an inclined structure. The light shield 71 is driven by the first electric push rod installed on the top of the detection dark chamber 2. The end of the crossbar 76 abuts against the contact surface of the second contact block 75. The crossbar 76 is driven by the second electric push rods installed on both sides of the light shield 71. The second electric push rods are connected to the pressure sensor by an electrical signal. The reset rods 77 are connected by a third spring. The first electric push rod drives the light shield box 71 to snap down, forming a closed light shield detection space with the support platform 5 to isolate external stray light interference. The pressure sensor on the top side wall of the support platform 5 triggers the positioning signal, controlling the second electric push rod to drive the crossbar 76 to slide vertically downward along the side wall of the light shield box 71. The end of the crossbar 76 abuts against the inclined surface of the second abutment block 75, pushing the second abutment blocks 75 on both sides to move towards each other. The pull rod 74 drives the cleaning scraper 73 to move away from each other. The cleaning scraper 73 simultaneously scrapes from the middle to both sides along the upper surface of the screen to remove the floating dust attached to the screen surface.

[0023] Working principle: In the initial state, when the support platform 5 is in the loading position, the traction rod 8 is engaged with the high section of the spiral protrusion 9, and the placement plate 61 is located at the high position of the top of the support platform 5 under the support of the traction rod 8; at this time, the sliding block 64 is close to the fixed block 62 under the action of the first spring on the sliding rod 63, the offset rod 65 is in a retracted state, the sliding plate 681 is in a position away from the placement plate 61, the elastic contact 686 does not block the placement area, and the operator can directly and stably place the LCD screen to be tested on the placement plate 61. At this time, there is no structural interference when placing and picking up. During the test, the rotating table 4 starts to rotate under the drive of the drive motor. The rotation of the rotating table 4 drives the support platform 5 to rotate towards the area below the detection dark chamber 2. During this process, one end of the traction rod 8 extends out of the support platform 5 and slides along the surface of the spiral protrusion 9 connected end to end on the periphery of the support base 3. The height of the protrusion 9 gradually decreases along the rotation direction of the rotating table 4, and the traction rod 8 moves downward accordingly, driving the placement plate 61 to descend vertically along the groove at the top of the support platform 5. During the descent of the placement plate 61, it pushes downward. The movable offset rod 65 deflects and pushes the sliding block 64 outward, causing the sliding block 64 to slide along the slide rod 63 away from the fixed block 62, compressing the first spring sleeved on the slide rod 63. Simultaneously, the movement of the sliding block 64 drives the push rod 66 and the first abutting block 67 to move outward from the support platform 5. The inclined surface at the top of the first abutting block 67 abuts upward against the abutting rod 683, forcing the abutting rod 683 to move vertically and compressing the second spring sleeved on the surface of the abutting rod 683. As the abutting rod 683 moves upward, the abutting rod... The guide rods 684 on both sides of the contact rod 683 will slide inside the inclined guide groove 685 opened on the surface of the limiting plate 682. Under the inclined guide action of the guide groove 685, the limiting plates 682 on both sides drive the sliding plate 681 to move synchronously towards the center of the placement plate 61. The elastic contact 686 on the surface of the sliding plate 681 gradually abuts against the side of the LCD screen. As the placement plate 61 continues to descend, the screen body is finally automatically centered and clamped, so that the central area of ​​the screen body is precisely aligned with the optical axis of the imaging brightness meter 72 above. When the support platform 5 rotates to the detection position directly below the detection dark chamber 2, the traction rod 8 reaches the bottom area of ​​the spiral protrusions 9 connected end to end. At this time, the placement plate 61 descends to the detection position, and the positioning component completes stable clamping. Subsequently, the first electric push rod drives the light shield box 71 to snap down, forming a closed light shield detection space with the support platform 5 to isolate external stray light interference. The pressure sensor on the top side wall of the support platform 5 triggers the positioning signal, controlling the second electric push rod to drive the crossbar 76 to slide vertically downward along the side wall of the light shield box 71. The end of the crossbar 76 abuts against the inclined surface of the second abutment block 75, pushing the second abutment blocks 75 on both sides to move towards each other. The pull rod 74 drives the cleaning scraper 73 to move away from each other. The cleaning scraper 73 simultaneously scrapes from the middle to both sides along the upper surface of the screen to remove the floating dust attached to the screen surface. After cleaning, the cleaning scraper 73 is retracted into the receiving groove, completely avoiding the detection light path. After the light path is unobstructed, the imaging brightness meter 72 is activated, and the power-on display is completely white. The LCD screen in the field performs full-area brightness acquisition, calculates backlight brightness uniformity through built-in algorithms, and identifies optical defects such as dark spots and bright stripes. After the inspection is completed, the light shield 71 rises and resets under the drive of the first electric push rod, the rotating table 4 continues to rotate intermittently, the bearing table 5 leaves the inspection station, the traction rod 8 slides upward along the lifting section of the spiral protrusion 9 connected end to end, driving the placement plate 61 to rise synchronously. During the rise of the placement plate 61, the offset rod 65 deflects in the opposite direction, the first spring pushes the sliding block 64 to reset towards the fixed block 62, the first abutment block 67 moves accordingly, the abutment rod 683 resets downward under the elastic force of the second spring, the guide rod 684 slides in the opposite direction along the guide groove 685, driving the sliding plate 681 to move outward, driving the elastic contact 686 to disengage from the screen body, releasing the clamping state of the screen body. When the bearing table 5 rotates to the unloading station, the placement plate 61 rises to the highest position, the positioning component is fully opened, and the operator can directly take out the screen body that has been inspected.

[0024] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A backlight brightness uniformity testing device for a liquid crystal display production line, comprising a device base (1), characterized in that: The device base (1) is equipped with a detection dark chamber (2) on top. A support base (3) is fixedly connected to the middle of the bottom of the device base (1). A rotating platform (4) is rotatably connected to the top of the support base (3). A bearing platform (5) is fixedly connected to the outer surface of the rotating platform (4). A placement and positioning mechanism is installed inside the bearing platform (5). A cleaning and detection mechanism is installed inside the detection dark chamber (2). The placement and positioning mechanism includes a placement plate (61) that is limited to sliding in the groove at the top of the support platform (5). A fixing block (62) is fixedly connected to the center of the bottom of the support platform (5). A sliding rod (63) is fixedly connected to the outer surface of the fixing block (62). The other end of the sliding rod (63) is fixedly connected to the inner wall of the support platform (5). A sliding block (64) is slidably connected to the surface of the sliding rod (63). An offset rod (65) is rotatably connected to the side end of the sliding block (64). The other end of the offset rod (65) is rotatably connected to the bottom end of the placement plate (61). A push rod (66) is fixedly connected to the top of the sliding block (64). A first abutting block (67) is fixedly connected to the end of the push rod (66) away from the offset rod (65). A positioning component is installed around the placement plate (61) inside the support platform (5).

2. The backlight brightness uniformity detection device for a liquid crystal display production line according to claim 1, characterized in that: The positioning component includes a sliding plate (681) that slides within the outer cavity of the top of the support platform (5). A limiting plate (682) is fixedly connected to the back end of the sliding plate (681). An abutment rod (683) is provided on the inner side of the limiting plate (682). Guide rods (684) are fixedly connected to both sides of the abutment rod (683). A guide groove (685) is provided on the surface of the limiting plate (682). An elastic contact (686) is fixedly connected to the front surface of the sliding plate (681).

3. The backlight brightness uniformity detection device for a liquid crystal display production line according to claim 1, characterized in that: The cleaning and testing mechanism includes a light-shielding box (71) set in a darkroom (2). An imaging brightness meter (72) is installed at the top inside the light-shielding box (71). A cleaning scraper (73) is set at the bottom inside the light-shielding box (71). A pull rod (74) is fixedly connected to the side of the cleaning scraper (73) away from it. The pull rod (74) extends out of both sides of the light-shielding box (71) and is fixedly connected to a second abutment block (75). A horizontal bar (76) is vertically limited and slidable on both sides of the light-shielding box (71). A reset rod (77) is fixedly connected to the front and rear sides of the second abutment block (75). A receiving groove is opened on the inner wall of both sides of the light-shielding box (71) corresponding to the cleaning scraper (73).

4. The backlight brightness uniformity detection device for a liquid crystal display production line according to claim 1, characterized in that: A traction rod (8) is fixedly connected to the middle of the bottom end of the placement plate (61). A protrusion (9) is fixedly connected to the outer surface of the support base (3). The protrusion (9) is formed into a spiral structure with the head and tail connected along the outer surface of the support base (3). The bottom end of the protrusion (9) is on the side closer to the bottom of the detection dark chamber (2). The traction rod (8) is set into an "L" shaped structure. The end of the traction rod (8) away from the placement plate (61) passes through the fixed block (62) and extends out of the bottom of the support platform (5). The extended end of the traction rod (8) is fitted and slid on the surface of the protrusion (9).

5. The backlight brightness uniformity detection device for a liquid crystal display production line according to claim 1, characterized in that: The slide rods (63) are evenly arranged in four groups on the outer surface of the fixed block (62). The surface of the four groups of slide rods (63) is fitted with a first spring, and the other end of the first spring is fixedly connected to the back end of the slide block (64).

6. The backlight brightness uniformity detection device for a liquid crystal display production line according to claim 2, characterized in that: The contact surface of the first contact block (67) is set as an inclined structure, the bottom of the contact rod (683) abuts against the contact surface of the first contact block (67), and a second spring is sleeved on the surface of the contact rod (683).

7. The backlight brightness uniformity detection device for a liquid crystal display production line according to claim 2, characterized in that: Two sets of limiting plates (682) are provided on the back end of the sliding plate (681). The guide groove (685) is opened on the surface of the limiting plate (682) in an inclined structure. The guide rod (684) is limited and slids within the guide groove (685). Several sets of elastic contacts (686) are provided on the front surface of the sliding plate (681).

8. The backlight brightness uniformity detection device for a liquid crystal display production line according to claim 1, characterized in that: The support platform (5) is evenly arranged in four groups on the outer surface of the rotating platform (4). A pressure sensor is installed on the top side wall of the support platform (5). The rotating platform (4) is driven by a drive motor at the bottom of the device base (1).

9. The backlight brightness uniformity detection device for a liquid crystal display production line according to claim 3, characterized in that: The contact surface of the second contact block (75) is set as an inclined structure. The light shield (71) is driven by the first electric push rod installed on the top of the detection dark chamber (2). The end of the crossbar (76) abuts against the contact surface of the second contact block (75). The crossbar (76) is driven by the second electric push rod installed on both sides of the light shield (71). The second electric push rod is connected to the pressure sensor by an electrical signal. The reset rods (77) are connected by a third spring.

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