Brightness detection device and detection method for LED display screen

Abstract

The invention discloses a brightness detection device and method for an LED display screen, and relates to the field of testing of optical equipment. The device comprises a conveying piece, and a single-point brightness detection piece and an area brightness detection piece which can move left and right are sequentially installed on the left side of the conveying piece from front to back; blanking clamping pieces are arranged above the single-point brightness detection piece and the area brightness detection piece; light shields are arranged on the right side of the single-point brightness detection part and the right side of the regional brightness detection part. The method adopts the device for detection; an existing brightness detection method for an LED display screen has the problems of low efficiency and low detection accuracy. The brightness detection device and the detection method for the LED display screen provided by the invention have the advantages of high efficiency and high detection accuracy.

Description

Technical Field

[0001] The present invention relates to the field of testing of optical devices, and particularly to a brightness detection device and a detection method for an LED display screen. Background Art

[0002] As a display device widely used in various scenarios, the functions of an LED display screen need to have a certain stability and reliability. Therefore, during the production and manufacturing process, a comprehensive functional test of the LED display screen is required. Among them, the hardware functional tests mainly include display effect detection, gray level detection, brightness detection, viewing angle detection, color detection, and pixel point detection.

[0003] The indicators to be detected in brightness detection include brightness value, brightness uniformity, brightness-gray level characteristics, color balance, etc. Currently, the common method in factories is to transport the LED display screen to the detection position by a trolley, then insert the power plug into the power socket of the LED display screen and insert the signal input plug into the signal input socket of the LED display screen. After the staff connects the power supply and the instrument, the brightness of the LED display screen is directly observed by the human eye. In this process, obviously, it takes time for handling, adjusting the position, and inserting the power supply plug, resulting in low efficiency. Moreover, the human eye recognition error is large, and it is easy to make misjudgments.

[0004] Therefore, the existing brightness detection methods for LED display screens have the problems of low efficiency and low detection accuracy. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the above-mentioned disadvantages of the prior art and provide a brightness detection device and a detection method for an LED display screen with higher efficiency and higher detection accuracy.

[0006] To solve the above technical problem, a brightness detection device for an LED display screen provided by the present invention includes a conveying member for conveying the LED display screen from front to back and supplying power and inputting signals to the LED display screen. A single-point brightness detection member and a regional brightness detection member capable of moving left and right are sequentially installed on the left side of the conveying member from front to back. Above the single-point brightness detection member and the regional brightness detection member, there is a blanking clamping member capable of lifting for clamping the LED display screen. On the right side of the single-point brightness detection member and the regional brightness detection member, there is a light-shielding cover capable of moving left and right for shielding the LED display screen.

[0007] As a further improvement of the present invention: the transmission member includes a bracket, and a plurality of pulley groups are arranged between the left side wall and the right side wall of the bracket from front to back, each pulley group includes a left pulley rotatably installed on the left side wall of the bracket and a right pulley rotatably installed on the right side wall of the bracket, each left pulley is transmission connected, and each right pulley is transmission connected; a horizontal first motor is arranged on one side of the bracket, the first motor is transmission connected to the left pulley or the right pulley in one of the pulley groups, and the left pulley in the pulley group transmission connected to the first motor is coaxially transmission connected to the right pulley; a plurality of bases for placing LED display screens are arranged on the side of the left belt and the right belt away from the pulley group, and a power plug and a signal input plug are arranged on the top of the base.

[0008] Preferably, large sliders are provided on both sides of the left and right sides of the base, and large annular grooves for the large sliders to slide are provided on the opposite sides of the left and right walls of the bracket. Vertical pieces are vertically installed on the left and right sides of the bottom of the base respectively, the vertical piece on the left is rotatably connected to the left side of the left belt, and the vertical piece on the right is rotatably connected to the right side of the right belt.

[0009] Preferably, a plurality of rubber rollers parallel to each other are arranged between the bases, the central axis of the rubber rollers is perpendicular to the conveying direction of the conveyor, and small annular grooves for sliding the left and right ends of the rubber rollers are respectively provided on the opposite sides of the left and right walls of the bracket.

[0010] As a further improvement of the present invention: the single-point brightness detection component includes at least four light-shielding tube-type brightness meters that can move left and right synchronously, and the rear ends of the at least four light-shielding tube-type brightness meters are fixedly mounted on the first connecting plate; a horizontal first telescopic component is fixedly mounted on the conveying component, the telescopic end of the first telescopic component is perpendicular to the conveying direction of the transmission component, and the top end of the telescopic end of the first telescopic component is fixedly connected to the first connecting plate.

[0011] As a further improvement of the present invention: the regional brightness detection member includes a CCD sensor fixedly mounted on the transmission member and used for performing regional brightness detection on the display area of ​​the LED display screen.

[0012] As a further improvement of the present invention: the blanking clamping member includes an inverted U-shaped frame that can be raised and lowered, two vertical second telescopic members for driving the inverted U-shaped frame to rise and fall, and a front clamping plate and a rear clamping plate that can move forward and backward for clamping the LED display screen; the front clamping plate and the rear clamping plate are respectively slidably mounted on the opposite surfaces of the two vertical ends of the inverted U-shaped frame.

[0013] As a further improvement of the present invention: a refresh rate detection component for detecting the refresh rate of the screen is arranged behind the regional brightness detection component, a light shield is arranged on the right side of the refresh rate detection component, and a blanking clamp is arranged above it.

[0014] Preferably, the rear sides of the light-shielding covers are fixedly installed on the second connecting plate, and a horizontal third telescopic member for driving the second connecting plate to move left and right is fixedly installed on the bracket of the conveying member.

[0015] The present invention also provides a brightness detection method for an LED display screen. The detection is carried out by using the above-mentioned brightness detection device for an LED display screen, and it includes: feeding the LED display screen from the feeding end of the conveying member. When the LED display screen reaches the single-point brightness detection member and / or the area brightness detection member, the light-shielding cover moves left to shield the LED display screen, and the single-point brightness detection member and / or the area brightness detection member perform detection. After the detection is completed, the light-shielding cover moves right; if the LED display screen is a non-conforming LED display screen, the blanking clamping member descends to clamp the non-conforming LED display screen and then ascends, and the conforming LED display screen continues to be conveyed backward by the conveying member.

[0016] The beneficial effects of the present invention are as follows: The brightness detection device and detection method for an LED display screen provided by the present invention have high efficiency and high detection accuracy; the conveying member of the device can convey the LED display screen from front to back, and can supply power and input signals to the LED display screen during the conveying process. Therefore, only the LED display screen needs to be placed on the conveying member. Through the cooperation of the single-point brightness detection member, the area brightness detection member and the light-shielding cover, the single-point brightness detection and area brightness detection of the LED display screen in a dim environment can be realized, and the detection result is more accurate. And the blanking clamping member above the single-point brightness detection member and the area brightness detection member can take away the non-conforming LED display screen when it is unqualified; the method using this device is also relatively simple, which improves the detection efficiency and also improves the detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is a schematic diagram of the overall structure of the present invention and multiple LED display screens; Figure 2 is a schematic diagram of the overall structure of the present invention; Figure 3 is a top view of the present invention; Figure 4 is a schematic diagram of the overall structure of the conveying member in the present invention; Figure 5 is a schematic diagram of the positional relationship of the right pulley, the right belt, and the wire in the present invention; Figure 6 is a schematic diagram of the positional relationship of the right pulley, the right belt, the wire, and the rubber roller in the present invention; Figure 7 is a partial schematic diagram of the conveying member in the present invention; Figure 8 is a partial sectional view of the bracket and the left pulley in the present invention; Figure 9Schematic diagram of the positional relationship between the upper part of the base and the wire in the present invention; Figure 10 Partial structural schematic diagram of the single - point brightness detector in the present invention; Figure 11 Schematic diagram of the positional relationship between part of the bracket, single - point brightness detector, area brightness detector, refresh rate detector, and wire in the present invention; Figure 12 Schematic diagram of the positional relationship between the bracket and the blanking clamping part in the present invention; Figure 13 Schematic diagram of the positional relationship between the bracket and part of the blanking clamping part in the present invention Figure 14 Partial sectional view schematic diagram of part of the blanking clamping part in the present invention; Figure 15 Schematic diagram of the positional relationship between the front clamping plate or the rear clamping plate and the cap - rod, the second return spring in the present invention; Figure 16 Perspective schematic diagram of the overall structure of the light - shielding cover in the present invention; Figure 17 Overall structural schematic diagram of part of the bracket in the present invention; The names of the components corresponding to the marks in the above - mentioned drawings are: 1. Conveyor; 101. Bracket; 1011. Large circular chute; 1012. Small circular chute; 1013. Frame; 1014. Chute; 102L. Left pulley; 102R. Right pulley; 103L. Left belt; 103R. Right belt; 104. First motor; 105. Base; 1051. Large slider; 1052. Vertical piece; 106. Rubber roller; 2. Single - point brightness detector; 201. Shading - tube - type brightness meter; 202. First connecting plate; 203. First telescopic member; 204. Ring - shaped rubber head; 205. First return spring; 3. Area brightness detector; 301. CCD sensor; 4. Blanking clamping part; 401. Inverted U - shaped frame; 402. Second telescopic member; 403F. Front clamping plate; 403B. Rear clamping plate; 404. Vertical rail; 405. Cap - rod; 406. Second return spring; 501. Light - shielding cover; 5011. Convex rib; 502. Second connecting plate; 503. Third telescopic member; 6. Refresh rate detector; 601. High - speed camera; 701. Button; 801. Wire; 802. Wire tube. Detailed description of the specific implementation mode

[0018] The following further elaborates in detail on the specific implementation mode of the present invention in conjunction with the drawings.

[0019] In the present invention, the orientation terms such as "up", "down", "left", "right", "front", "rear", "top", "bottom", etc. are all based on Figure 3 the direction defined by the cross-shaped orientation mark in []. It should be particularly noted that the top end of the telescopic end of the telescopic member refers to the end of the telescopic end that is far from its fixed end. All the orientation terms in the present invention are described based on this definition and do not change the orientation they represent with the change of the angle of the figure. A horizontal motor means that the output shaft of the motor is parallel to the ground, a vertical telescopic member means that the telescopic end of the telescopic member is perpendicular to the ground, and a horizontal telescopic member means that the telescopic end of the telescopic member is parallel to the ground.

[0020] Such as Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , Figure 7 , Figure 8 , Figure 9As shown, a brightness detection device for an LED display screen provided by the present invention includes a transmission member 1 for transporting an LED display screen from front to back and supplying power and inputting signals to the LED display screen, the transmission member 1 includes a bracket 101, and a plurality of pulley groups are arranged from front to back between the left side wall and the right side wall of the bracket 101, each pulley group includes a left pulley 102L rotatably mounted on the left side wall of the bracket 101 and a right pulley 102R rotatably mounted on the right side wall of the bracket 101, each left pulley 102L is connected to the left side wall of the bracket 101 by a left belt 103L, and each right pulley 102R is connected to the right side wall of the bracket 101 by a right belt 103R; a horizontal first motor 104 is arranged on one side of the bracket 101, and the first motor 104 is connected to the The left pulley 102L or the right pulley 102R in one of the pulley groups is connected in transmission, and the left pulley 102L and the right pulley 102R in the pulley group connected in transmission with the first motor 104 are coaxially connected in transmission; a plurality of bases 105 for placing the LED display screen are arranged on the side of the left belt 103L and the right belt 103R away from the pulley group, a power socket and a signal input socket are arranged behind the LED display screen, a placement groove for placing the LED display screen is arranged on the top of the base 105, and a power plug for power supply matching the power socket and a signal input plug for allowing the LED display screen to display a test screen are also arranged on the top of the base 105. A first pulley is fixedly installed on the output shaft of the first motor 104, and a second pulley is fixedly sleeved on the end of the left pulley 102L or the right pulley 102R close to the first motor 104, and the first pulley and the second pulley are connected through the first belt transmission. Large sliders 1051 are provided on the left and right sides of the base 105, and large annular grooves 1011 for the large slider 1051 to slide are provided on the opposite sides of the left and right walls of the bracket 101. Vertical pieces 1052 are vertically installed on the left and right sides of the bottom of the base 105, respectively. The vertical piece 1052 on the left is rotatably connected to the left side of the left belt 103L, and the vertical piece 1052 on the right is rotatably connected to the right side of the right belt 103R. A plurality of protrusions that can slide in the large annular grooves 1011 are provided on the surfaces of the left belt 103L and the right belt 103R close to the bracket 101. A plurality of mutually parallel insulating rubber rollers 106 are arranged between each base 105 to prevent other objects or operators from contacting the wire 801. The central axis of the rubber roller 106 is perpendicular to the conveying direction of the conveyor 1. Small annular grooves 1012 for the left and right ends of the rubber roller 106 to slide are respectively provided on the opposite sides of the left and right walls of the bracket 101. Gaps are left between the rubber roller 106 and the wire, and between the rubber roller 106 and the left belt 103L or the right belt 103R.Below the base 105, multiple parallel wires 801 (three in the figure) are arranged between the left and right side walls of the support 101. The central axis of the wire 801 is parallel to the conveying direction of the conveyor 1. Grooves that match the shape, number, size, and position of each wire 801 are provided at the bottom of the base 105. Copper sheets for sensing the wires 801 are arranged in the grooves. The wire 801 includes a power line and a data line. The copper sheet in contact with the power line is electrically connected to the power plug, and the copper sheet in contact with the data line is electrically connected to the signal input plug. Both ends of the multiple wires 801 penetrate through the left or right side wall of the support 101 and extend outside the support 101. A wire tube 802 for protecting the wire 801 is installed outside the support 101. Above the discharging end of the support 101, a small inverted U-shaped frame is provided. A button 701 for controlling the first motor 104 is installed on the front side of the small inverted U-shaped frame. When the LED display reaches the discharging end and touches the button 701, the button 701 will control the first motor 104 to stop working, preventing the LED display from continuing to be conveyed backward and falling off.

[0021] Such as Figure 1 , Figure 2 , Figure 3 , Figure 10 , Figure 11As shown in the figure, on the left side of the conveyor 1, from front to back, there are successively installed a single-point brightness detection component 2 that can move left and right and is used to measure the brightness of a certain pixel, a regional brightness detection component 3 that is used to measure the overall brightness of the display area of the LED display screen, and a refresh rate detection component 6 that is used to detect the screen refresh rate; at the top of the left side of the bracket 101, there are fixedly installed a plurality of frames 1013 that can cooperate with the light-shielding cover 501 to make the LED display screen in a dim environment. The frames 1013 are all in the shape of a cuboid with a single-sided opening, and the opening faces to the right. The light-shielding cover 501 can enter the frames 1013. The single-point brightness detection component 2 includes at least four light-shielding tube type brightness meters 201 that can move left and right synchronously. The light-shielding tube type brightness meters 201 vertically penetrate the left side surface of the frame 1013. When the number of the light-shielding tube type brightness meters 201 is four, the brightness of the upper left corner, upper right corner, lower left corner, and lower right corner of the LED display screen is measured respectively; when the number of the light-shielding tube type brightness meters 201 is five, the brightness of the upper left corner, upper right corner, lower left corner, lower right corner, and the center position of the LED display screen is measured respectively. The rear ends of at least four light-shielding tube type brightness meters 201 are all fixedly installed on the first connecting plate 202; on the bracket 101 of the conveyor 1, there is fixedly installed a horizontal first telescopic component 203. The telescopic end of the first telescopic component 203 is perpendicular to the conveying direction of the transmission component 1, and the top end of the telescopic end of the first telescopic component 203 is fixedly connected to the left side of the first connecting plate 202; on the left side of the side of the cylindrical shell of the light-shielding tube type brightness meter 201 close to the LED display screen, there is provided an annular rubber head 204. The central axis of the annular rubber head 204 is perpendicular to the LED display screen. Between the side of the cylindrical shell of the light-shielding tube type brightness meter 201 close to the LED display screen and the side of the annular rubber head 204 far from the LED display screen, there is installed a first return spring 205. The telescopic direction of the first return spring 205 is perpendicular to the LED display screen. The regional brightness detection component 3 includes a CCD sensor 301 that is fixedly installed at the center of the left side surface of the frame 1013 in the conveyor 1 and is used to perform regional brightness detection on the display area of the LED display screen. The refresh rate detection component 6 is located behind the regional brightness detection component 3. The refresh rate detection component 6 is a high-speed camera 601 installed on the frame 1013.

[0022] As Figure 1 , Figure 2 , Figure 3 , Figure 12 , Figure 13 , Figure 14 , Figure 15As shown in the figure, above the single-point brightness detector 2, the area brightness detector 3, and the refresh rate detector 6, there is a blanking clamping member 4 that can be lifted and lowered for clamping the LED display screen; the blanking clamping member 4 includes an inverted U-shaped frame 401 that can be lifted and lowered, two vertical second telescopic members 402 for driving the inverted U-shaped frame 401 to lift and lower, and a front clamping plate 403F and a rear clamping plate 403B that can move back and forth for clamping the LED display screen; on the top of the frame 1013 of the support 101 of the conveyor 1, there is a vertical rail 404 for the inverted U-shaped frame 401 to slide up and down; the front clamping plate 403F and the rear clamping plate 403B are respectively slidably installed on opposite sides of the two vertical ends of the inverted U-shaped frame 401. On the opposite sides of the front clamping plate 403F and the rear clamping plate 403B, at least two rod bodies are vertically installed. The end of the rod body on the front clamping plate 403F away from the front clamping plate 403F penetrates through the front vertical end and extends outside the inverted U-shaped frame 401. The end of the rod body on the rear clamping plate 403B away from the rear clamping plate 403B penetrates through the rear vertical end and extends outside the inverted U-shaped frame 401. Caps are fixedly installed at the ends of the rod bodies outside the inverted U-shaped frame 401. The rod bodies with caps are the capped rods 405; between the front clamping plate 403F and the front vertical end, and between the rear clamping plate 403B and the rear vertical end, second return springs 406 are provided. On the surfaces of the front clamping plate 403F and the rear clamping plate 403B for contacting the LED display screen, there are multiple parallel protruding teeth for enhancing friction. The tips of the teeth face upward and the roots face downward, so that when the LED display screen moves upward from below, the resistance is small; while if the LED display screen moves downward after being clamped, it will be blocked and it is difficult to slide down. The cross-sections of the front clamping plate 403F and the rear clamping plate 403B are both J-shaped. The arc-shaped part below is to more easily guide the LED display screen between the front clamping plate 403F and the rear clamping plate 403B after contacting the LED display screen.

[0023] As Figure 1 , Figure 2 , Figure 3 , Figure 16 , Figure 17 As shown in the figure, on the right side of the single-point brightness detector 2, the area brightness detector 3, and the refresh rate detector 6, there is a light-shielding cover 501 that can move left and right for shielding the LED display screen to be detected or under detection. The light-shielding cover 501 can make the LED display screen in a dim environment when being detected. The rear sides of the light-shielding covers 501 are fixedly installed on the second connecting plate 502. On the support 101 of the conveyor 1, a horizontal third telescopic member 503 for driving the second connecting plate 502 to move left and right is fixedly installed. The light-shielding cover 501 includes an inverted U-shaped plate and an L-shaped plate fixedly installed on the inverted U-shaped plate. On the front and rear sides of the bottom of the L-shaped plate, there are convex ribs 5011. On the top of the support 101, there is a sliding groove 1014 for the convex ribs 5011 to slide left and right.

[0024] The present invention also provides a brightness detection method for an LED display screen, which uses the above-mentioned brightness detection device for an LED display screen for detection. The specific steps include: feeding the LED display screen from the feeding end of the conveying member 1. When the LED display screen reaches the detection position of the single-point brightness detection member 2 and / or the area brightness detection member 3 and / or the refresh rate detection member 6, the light-shielding cover 501 moves leftward to shield the LED display screen, and the single-point brightness detection member 2 and / or the area brightness detection member 3 and / or the refresh rate detection member 6 perform detection. After the detection is completed, the light-shielding cover 501 moves rightward; if the LED display screen is a non-conforming LED display screen, the blanking clamping member 4 descends to clamp the non-conforming LED display screen and then ascends, and the non-conforming LED display screen is taken off the blanking clamping member 4. The qualified LED display screen continues to be conveyed backward by the conveying member 1. When it touches the button 701, the conveying member 1 stops conveying.

[0025] The working principle of the present invention is as follows: Place the LED display screen on the base 105 at the feeding end of the conveying member 1. When placing, the LED display screen needs to be aligned with the placement groove at the top of the base 105 and vertically inserted into the placement groove from top to bottom. In this way, when the placement is completed, the bottom of the LED display screen is located in the placement groove, the power plug is inserted into the power socket, and the signal input plug is inserted into the signal input socket. Thus, the precise placement, power supply, and signal input of the LED display screen are completed simultaneously.

[0026] Start the first motor 104. The first motor 104 drives the first pulley to rotate. The first pulley drives the second pulley to rotate through the first belt, thereby driving the left pulley 102L and the right pulley 102R to rotate. The left pulley 102L drives the remaining left pulleys 102L to rotate through the left belt 103L, and the right pulley 102R drives the remaining right pulleys 102R to rotate through the right belt 103R. The left belt 103L and the right belt 103R rotate synchronously, driving the base 105 to move backward, thereby driving the LED display screen to move backward. The large slider 1051 slides counterclockwise in the large annular chute 1011 (observed from the left side). The base 105 pushes the rubber roller 106 to move. The left end of the rubber roller 106 slides in the small annular chute 1012 on the left side wall of the bracket 101, and the right end of the rubber roller 106 slides in the small annular chute 1012 on the right side wall of the bracket 101.

[0027] After the LED display screen moves to the detection position of the single-point brightness detection member 2, the telescopic end of the third telescopic member 503 extends, driving the convex rib 5011 of the light-shielding cover 501 to slide leftward in the chute 1014. The light-shielding cover 501 approaches the frame 1013. After covering the LED display and making it in a dim environment, the telescopic end of the third telescopic member 503 stays at this length.

[0028] Activate the first telescopic member 203. The telescopic end of the first telescopic member 203 extends, driving the four light-shielding tube type luminometers 201 to move synchronously to the right. The incident ports of the four light-shielding tube type luminometers 201 gradually approach the LED display screen. The annular rubber head 204 will first come into contact with the LED display screen. As the light-shielding tube type luminometers 201 continue to move to the right, the first return spring 205 is gradually compressed. When the telescopic end of the first telescopic member 203 extends to a preset length, make the telescopic end of the first telescopic member 203 stay at this length. The four light-shielding tube type luminometers 201 respectively measure the brightness of the upper left corner, upper right corner, lower left corner, and lower right corner of the LED display screen, obtaining the brightness values of the upper left corner, upper right corner, lower left corner, and lower right corner of the LED display screen. After the measurement is completed, the telescopic end of the first telescopic member 203 shortens, driving the four light-shielding tube type luminometers 201 to move synchronously to the left. The incident ports of the four light-shielding tube type luminometers 201 gradually move away from the LED display screen, and the first return spring 205 gradually returns to the natural elongation state. Finally, the annular rubber head 204 also moves away from the LED display screen. If the brightness values at various locations do not reach the preset brightness threshold, it is determined as unqualified.

[0029] After the detection is completed, the telescopic end of the third telescopic member 503 shortens, driving the convex rib 5011 of the light-shield 501 to slide to the right in the chute 1014, thus not obstructing the backward transmission of the LED display screen.

[0030] When the LED display screen continues to move backward to the detection position of the area brightness detector 3, the light-shield 501 moves to the left. When the LED display screen is in a dim environment, activate the CCD sensor 301. The CCD sensor 301 can statistically analyze the brightness values of the pixel points within the display area of the LED display screen, calculate the average value, maximum value, minimum value, etc., and can also make a judgment according to the preset brightness threshold. If the brightness value of the pixel point does not reach the preset brightness threshold, it is determined as unqualified. After the detection is completed, the light-shield 501 moves to the right, and the LED display screen continues to move backward.

[0031] After the LED display screen reaches the detection position of the refresh rate detector 6, the light-shield 501 moves to the left. When the LED display screen is in a dim environment, the high-speed camera 601 takes images at an extremely high frame rate. By obtaining the image change situation of the LED display screen within a period of time, the refresh rate of the LED display screen is obtained through computer analysis. After the detection is completed, the light-shield 501 moves to the right, and the LED display screen continues to move backward.

[0032] When it reaches the blanking end, the LED display screen will touch the button 701. The button 701 controls the conveyor 1 to stop conveying and stay at the current position. After taking away the LED display screen, the button 701 returns to its original position and controls the conveyor 1 to continue working.

[0033] After the detection, when the indicators detected by the single-point brightness detector 2, the area brightness detector 3 or the refresh rate detector 6 do not meet the preset thresholds, it is confirmed that the detected LED display screen is a defective LED display screen. After the light-shielding cover 501 moves to the right, the telescopic end of the second telescopic member 402 gradually shortens, driving the inverted U-shaped frame 401 to slide downward on the vertical rail 404. The arc portions of the front clamping plate 403F and the rear clamping plate 403B both come into contact with the defective LED display screen. The inverted U-shaped frame 401 continues to descend. Due to its own width, the defective LED display screen causes the front clamping plate 403F and the rear clamping plate 403B to move away from each other. The cap rods 405 on the front clamping plate 403F and the rear clamping plate 403B also slide away from each other in the two vertical ends, and the second return spring 406 is compressed. After the defective LED display screen is completely clamped by the front clamping plate 403F and the rear clamping plate 403B, the telescopic end of the second telescopic member 402 gradually elongates, driving the inverted U-shaped frame 401 to slide upward on the vertical rail 404, so that the defective LED display screen gradually rises. After the inverted U-shaped frame 401 rises to the initial height, the second telescopic member 402 stops working. After the staff or the robotic arm holds the LED display screen firmly, continue to press the front clamping plate 403F and the rear clamping plate 403B to make the distance between them the largest, and then take out the defective LED display screen.

Claims

1. A brightness detection device for an LED display screen, characterized in that: It comprises a transmission member (1) for transporting an LED display screen from front to back and supplying power and inputting signals to the LED display screen, wherein a single-point brightness detection member (2) and a regional brightness detection member (3) capable of being moved leftward and rightward are sequentially installed on the left side of the transmission member (1) from front to back; A material-cutting clamping member (4) capable of being raised and lowered and used for clamping the LED display screen is provided above the single-point brightness detection member (2) and the regional brightness detection member (3); A light shield (501) capable of moving left and right and used to shield the LED display screen is provided on the right side of the single-point brightness detection element (2) and the regional brightness detection element (3).

2. A brightness detection device for an LED display screen according to claim 1, characterized in that: The transmission member (1) comprises a support (101), and a plurality of pulley groups are arranged between the left side wall and the right side wall of the support (101) from front to back, each pulley group comprises a left pulley (102L) rotatably mounted on the left side wall of the support (101) and a right pulley (102R) rotatably mounted on the right side wall of the support (101), each left pulley (102L) being transmission-connected, and each right pulley (102R) being transmission-connected; A horizontal first motor (104) is disposed on one side of the bracket (101); the first motor (104) is transmission-connected to a left belt pulley (102L) or a right belt pulley (102R) in one of the belt pulley groups; the left belt pulley (102L) and the right belt pulley (102R) in the belt pulley group transmission-connected to the first motor (104) are coaxially transmission-connected; A plurality of bases (105) for placing LED display screens are arranged on the side of the left belt (103L) and the right belt (103R) away from the pulley group, and a power plug and a signal input plug are arranged on the top of the base (105).

3. A brightness detection device for an LED display screen according to claim 2, characterized in that: Large sliding blocks (1051) are provided on both left and right sides of the base (105); large annular sliding grooves (1011) for the large sliding blocks (1051) to slide are provided on the opposite sides of the left and right walls of the bracket (101); vertical plates (1052) are vertically installed on the left and right sides of the bottom of the base (105); the vertical plate (1052) on the left side is rotatably connected to the left side of the left belt (103L), and the vertical plate (1052) on the right side is rotatably connected to the right side of the right belt (103R).

4. A brightness detection device for an LED display screen according to claim 2, characterized in that: A plurality of mutually parallel rubber rollers (106) are arranged between the bases (105), the central axis of the rubber roller (106) being perpendicular to the conveying direction of the conveying member (1), and small annular sliding grooves (1012) for sliding the left and right ends of the rubber roller (106) are respectively provided on the opposite sides of the left and right walls of the bracket (101).

5. A brightness detection device for an LED display screen according to any one of claims 1 to 4, characterized in that: The single-point brightness detection member (2) comprises at least four light-shielding tube-type brightness meters (201) capable of synchronously moving left and right, and the rear ends of the at least four light-shielding tube-type brightness meters (201) are fixedly mounted on the first connecting plate (202); A horizontal first telescopic member (203) is fixedly mounted on the transmission member (1); the telescopic end of the first telescopic member (203) is perpendicular to the transmission direction of the transmission member (1); and the top end of the telescopic end of the first telescopic member (203) is fixedly connected to the first connecting plate (202).

6. A brightness detection device for an LED display screen according to any one of claims 1 to 4, characterized in that: The regional brightness detection component (3) comprises a CCD sensor (301) fixedly mounted on the transmission component (1) and used for performing regional brightness detection on a display area of ​​the LED display screen.

7. A brightness detection device for an LED display screen according to any one of claims 1 to 4, characterized in that: The blanking clamp (4) comprises an inverted U-shaped frame (401) capable of being raised and lowered, two vertical second telescopic members (402) for driving the inverted U-shaped frame (401) to be raised and lowered, and a front clamping plate (403F) and a rear clamping plate (403B) capable of moving forward and backward for clamping the LED display screen; The front clamping plate (403F) and the rear clamping plate (403B) are respectively slidably mounted on opposite surfaces of the two vertical ends of the inverted U-shaped frame (401).

8. A brightness detection device for an LED display screen according to any one of claims 1 to 4, characterized in that: A refresh rate detection component (6) for detecting the refresh rate of the screen is arranged behind the regional brightness detection component (3), a light shield (501) is arranged on the right side of the refresh rate detection component (6), and a material blanking clamp (4) is arranged above the refresh rate detection component (6).

9. A brightness detection device for an LED display screen according to claim 8, characterized in that: The rear side of each light shield (501) is fixedly mounted on the second connecting plate (502), and a horizontal third telescopic member (503) for driving the second connecting plate (502) to move left and right is fixedly mounted on the bracket (101) of the conveying member (1).

10. A method for detecting brightness of an LED display screen, using the brightness detection device for an LED display screen as claimed in claim 1 for detection, characterized in that: include: The LED display screen is loaded from the loading end of the conveyor (1). When the LED display screen reaches the single-point brightness detection component (2) and / or the regional brightness detection component (3), the light shield (501) moves to the left to shield the LED display screen. The single-point brightness detection component (2) and / or the regional brightness detection component (3) perform detection. After the detection is completed, the light shield (501) moves to the right. If the LED display screen is an unqualified LED display screen, the unloading clamping component (4) descends to clamp the unqualified LED display screen and then rises. The qualified LED display screen continues to be transported backward by the conveyor (1).

Images