Light-emitting uniformity test equipment for LED (light-emitting diode) backlight source

Abstract

The invention relates to the technical field of backlight source testing, in particular to LED backlight source luminescence uniformity testing equipment which comprises a bottom plate, a plurality of stand columns are arranged on the bottom plate, a top plate is arranged at the upper ends of the stand columns jointly, a driving shaft is arranged on the top plate in a sliding and penetrating mode, a detection cover is arranged at the lower end of the driving shaft, and an area detector is arranged in the detection cover. The area detector comprises a #-shaped partition plate arranged in the detection cover, the #-shaped partition plate divides the interior of the detection cover into a plurality of containing holes distributed in a matrix mode, and light guide blocks are arranged in the containing holes. According to the invention, the LED backlight source is covered in the detection cover, and the buffer ring arranged at the bottom of the detection cover is pressed on the edge of the bottom plate or the LED backlight source, so that the interior of the detection cover is in a dark state without light, and in a dark environment without light, interference of external light to a detection result can be reduced, and light pollution can be avoided; the light-emitting characteristics, such as brightness and chromaticity, of the LED backlight source can be accurately measured.

Description

Technical Field

[0001] The present application relates to the technical field of backlight source testing, and in particular to a device for testing the luminous uniformity of an LED backlight source. Background Art

[0002] LED (light emitting diode) is a semiconductor device that can convert electrical energy into light energy. This conversion process is based on the recombination of electrons and holes inside the semiconductor material. LED has many advantages, including high efficiency, long life, fast response time, low power consumption and small size, making it a very important component in modern lighting and display technology.

[0003] LED backlight uses the light-emitting characteristics of LED to provide uniform lighting. In order to ensure the performance of LED backlight in various applications, especially in occasions such as LCD monitors that require uniform lighting, luminous uniformity testing becomes particularly important. Luminous uniformity testing equipment can evaluate whether the brightness and chromaticity distribution of LED backlight is uniform, ensuring the brightness and color consistency of the entire screen.

[0004] For example, a miniLED backlight source luminous uniformity testing equipment station with publication number CN115508051A relates to the field of backlight source testing technology. The prior art includes a box for miniLED backlight source luminous uniformity testing, wherein a pad for placing the miniLED backlight source is provided inside the box, and material openings are provided at both ends of the box, wherein both ends of the pad pass through the material openings and extend to the outside of the box, and a detection component for testing the luminous uniformity of the miniLED backlight source is provided above the pad.

[0005] However, the above existing technologies still have some defects when testing backlight sources:

[0006] 1. The above-mentioned prior art uses a driving component to drive the pad to move, pushes the pad 2 miniLED backlight source into the box, and then uses a photoresistor to detect the miniLED backlight source to test the uniformity of the light emission of the miniLED backlight source, that is, the miniLED backlight source moves under the photoresistor for detection.

[0007] Since the LED backlight source is composed of many evenly distributed LED beads with no physical barriers between them, their light can diffuse freely. If an LED bead fails or is damaged, its adverse effects may be masked by the light emitted by the surrounding normally working LED beads. This is because the light diffusion characteristics of LED beads make it difficult to directly observe the defects of a single bad bead, which may affect the accurate assessment of luminous uniformity.

[0008] 2. In the above-mentioned prior art, when testing the backlight source, the backlight source moves under the photoresistor for detection, and the uniformity of the light emission of the miniLED backlight source is tested through the photoresistor. Since the photoresistor is easily affected by the external environment, when the backlight source moves under the photoresistor, the photoresistor will be contaminated by external light, thereby affecting the detection result.

[0009] Based on this, and in accordance with the above-mentioned viewpoints, there is still room for improvement in the existing technology for backlight source testing. Summary of the invention

[0010] In order to solve the above technical problems, the present application provides a LED backlight source luminous uniformity testing device, which adopts the following technical solutions:

[0011] An LED backlight source luminous uniformity testing device comprises a bottom plate, a plurality of columns are arranged on the bottom plate, a top plate is arranged on the upper ends of the plurality of columns, a driving shaft is slidably penetrated on the top plate, a detection cover is arranged on the lower end of the driving shaft, and a regional detector is arranged in the detection cover;

[0012] The area detector comprises a well-shaped partition plate arranged in the detection cover, the well-shaped partition plate divides the detection cover into a plurality of receiving holes distributed in a matrix, and light guide blocks are arranged in the receiving holes.

[0013] Preferably, the area detector further comprises transverse light-transmitting holes provided between each horizontal row of receiving holes on the tic-tac-toe partition, longitudinal light-transmitting holes provided between each vertical row of receiving holes on the tic-tac-toe partition, and the transverse light-transmitting holes and longitudinal light-transmitting holes on the tic-tac-toe partition are staggered up and down;

[0014] The detection cover is provided with an optical sensor 1 corresponding to the transverse light-transmitting holes one by one, and the detection cover is provided with an optical sensor 2 corresponding to the longitudinal light-transmitting holes one by one.

[0015] Preferably, a transverse light guide rod is provided between the light guide blocks in each horizontal row on the tic-tac-toe partition, and the transverse light guide rod is located in a plurality of transverse light-transmitting holes in the same horizontal row and is connected to an optical sensor in the corresponding horizontal row;

[0016] A longitudinal light guide rod is commonly provided between the light guide blocks in each longitudinal column on the well-shaped partition plate, and the longitudinal light guide rod is located in a plurality of longitudinal light-transmitting holes in the same longitudinal column and is connected to the second optical sensor in the corresponding longitudinal column.

[0017] Preferably, a photosensitive detector located in the receiving hole is provided at the bottom of the light guide block;

[0018] The photosensitive detector comprises a detection frame arranged at the bottom of the light guide block and located in the receiving hole, wherein a tic-tac-toe diaphragm is arranged in the detection frame, and the tic-tac-toe diaphragm divides the detection frame into a plurality of receiving holes distributed in a matrix, wherein a focusing block is arranged in the receiving hole.

[0019] Preferably, a transverse light-guiding hole is provided between each horizontal row of receiving holes on the well-shaped diaphragm, a longitudinal light-guiding hole is provided between each vertical row of receiving holes on the well-shaped diaphragm, and the transverse light-guiding holes and the longitudinal light-guiding holes on the well-shaped diaphragm are staggered up and down;

[0020] The detection frame is provided with a photosensitive sensor 1 corresponding to the horizontal light guide holes one by one, and the detection frame is provided with a photosensitive sensor 2 corresponding to the vertical light guide holes one by one.

[0021] Preferably, a transverse optical fiber is provided between the light-gathering blocks in each horizontal row on the tic-tac-toe diaphragm, and the transverse optical fiber is located in a plurality of transverse light-guiding holes in the same horizontal row and is connected to a photosensitive sensor in the corresponding horizontal row;

[0022] A longitudinal optical fiber is commonly provided between the light-gathering blocks in each vertical column on the cross-shaped diaphragm, and the longitudinal optical fiber is located in a plurality of longitudinal light-guiding holes in the same vertical column and is connected to the second photosensitive sensor in the corresponding vertical column.

[0023] Preferably, a flexible light guide plate in contact with the light focusing block is provided at the bottom of the receiving hole.

[0024] Preferably, a clamp is provided on the bottom plate;

[0025] The clamp comprises a plurality of sliding holes symmetrically provided on the bottom plate, a clamping block is slidably provided in the sliding hole, a return spring is provided between one end of the clamping block and the sliding hole, a connecting rod slidably connected to the bottom plate is provided at the lower end of the clamping block, a clamping rack is provided on the connecting rod, and a clamping gear meshing with the clamping rack is rotatably provided on the bottom plate;

[0026] The detection cover is provided with support rods corresponding to the sliding holes one by one, one end of the support rod is slidably penetrated by a connecting rack meshing with a clamping gear, a protrusion is provided on the connecting rack, and a clamping spring is provided between the protrusion and the support rod.

[0027] Preferably, a clamping hole is provided on the clamping block, a rotating frame is slidably provided on the clamping hole, a roller is rotatably provided on the rotating frame, a spring support frame is provided on the end of the clamping block away from the roller, and a clamping spring is provided between the spring support frame and the rotating frame.

[0028] Preferably, a buffer ring is provided at the bottom of the detection cover.

[0029] In summary, the present application includes at least one of the following beneficial technical effects:

[0030] 1. The present invention covers the LED backlight source inside the detection cover, and the buffer ring arranged at the bottom of the detection cover will press the bottom plate or the edge of the LED backlight source, so that the inside of the detection cover is in a dark state without light. In the dark environment without light, the interference of external light on the detection result can be reduced to avoid light pollution, ensuring that the luminous characteristics of the LED backlight source, such as brightness and chromaticity, can be accurately measured.

[0031] 2. The area detector of the present invention divides the LED backlight source into several uniform light-emitting areas, and then performs optical brightness detection on each horizontal and vertical column of the area. If the light source detection of one horizontal column and one vertical column fails, the area detector will accurately locate the specific light-emitting area through the intersection points of the horizontal and vertical columns. After the uneven light-emitting area can be located by the coordinate positioning method, the photosensitive detector in the corresponding light-emitting area will be started. The photosensitive detector will further detect the LED backlight source in the uneven light-emitting area and locate the specific LED lamp beads with uneven light emission on the LED backlight source, thereby improving the efficiency and accuracy of the detection.

[0032] 3. The area detector and photosensitive detector of the present invention locate areas with uneven light through a coordinate positioning method, which not only helps to quickly identify areas with uneven light emission, but also facilitates recording and analysis of test results, which is helpful for subsequent quality control and improvement, thereby improving the production efficiency and product quality of LED backlight sources. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of the present invention.

[0034] Figure 2 It is a three-dimensional cross-sectional view of the present invention.

[0035] Figure 3 It is a schematic diagram of the structure of the area detector of the present invention.

[0036] Figure 4 is a cross-sectional view of the area detector of the present invention.

[0037] Figure 5 It is a structural schematic diagram of the well-shaped partition of the present invention.

[0038] Figure 6 It is a structural schematic diagram of the clamp of the present invention.

[0039] Figure 7 It is a cross-sectional view of the clamp of the present invention.

[0040] Figure 8 The present invention Figure 7 A partial enlarged view of point A.

[0041] Fig. 9It is a cross-sectional view of the abutment block of the present invention.

[0042] Fig.10 It is a schematic structural diagram of the driving member of the present invention.

[0043] Fig.11 It is a schematic diagram of the structure between the area detector and the photosensitive detector of the present invention.

[0044] Fig.12 The present invention Fig.11 A partial enlarged view of point B.

[0045] Fig.13 It is a schematic diagram of the structure between the photosensitive detectors of the present invention.

[0046] Fig.14 It is a cross-sectional view between the photosensitive detectors of the present invention.

[0047] Fig.15 It is a structural schematic diagram of the well-shaped diaphragm of the present invention.

[0048] Description of reference numerals: 1, bottom plate; 11, column; 2, top plate; 3, driving shaft; 4, detection cover; 41, guide rod; 42, buffer ring; 5, area detector; 51, well-shaped partition; 52, receiving hole; 53, light guide block; 54, horizontal light transmission hole; 55, vertical light transmission hole; 56, optical sensor 1; 57, optical sensor 2; 58, horizontal light guide rod; 59, vertical light guide rod; 6, photosensitive detector; 61, detection frame; 62, well-shaped diaphragm; 621, horizontal light guide hole; 622, vertical light guide hole; 63, receiving hole; 64, focusing block; 65 , photosensitive sensor 1; 66, photosensitive sensor 2; 67, transverse optical fiber; 68, longitudinal optical fiber; 69, flexible light guide plate; 7, clamp; 71, sliding hole; 72, clamping block; 721, reset spring; 722, connecting rod; 73, clamping rack; 74, clamping gear; 75, supporting rod; 751, connecting rack; 752, protrusion; 753, clamping spring; 76, clamping hole; 77, rotating frame; 771, roller; 78, spring support frame; 79, clamping spring; 8, driving member; 81, driving gear; 82, driving motor; 83, transmission gear. DETAILED DESCRIPTION

[0049] The following is combined with Figures 1 to 15 This application is described in further detail.

[0050] The embodiment of the present application discloses an LED backlight source luminous uniformity testing device, which improves the accuracy of the detection by dividing the LED backlight source into several uniform luminous areas and then performing optical brightness detection on each horizontal and vertical column of the area.

[0051] Embodiment 1:

[0052] Reference Figure 1 and Figure 2 , a LED backlight source luminous uniformity testing device comprises a bottom plate 1, a plurality of columns 11 are arranged on the bottom plate 1, and a top plate 2 is commonly arranged at the upper ends of the plurality of columns 11.

[0053] When conducting a uniformity test on the LED backlight source, first place the LED backlight source on the base plate 1, then start the driving member 8 provided on the top plate 2, and drive the driving shaft 3 sliding through the top plate 2 to move downward through the driving member 8. The moving driving shaft 3 will drive the detection cover 4 provided at the lower end of the driving shaft 3 to move together, and a number of guide rods 41 sliding through the top plate 2 will move together through the connection with the detection cover 4, and the guide rods 41 will guide the movement of the detection cover 4 to ensure the stability of the movement of the detection cover 4.

[0054] At the same time, the downward movement of the detection cover 4 will trigger the clamp 7 arranged on the bottom plate 1, and the clamp 7 will align and clamp the LED backlight source placed on the bottom plate 1 so that the LED backlight source is located directly below the clamping cover.

[0055] After the clamp 7 completes the clamping, the detection cover 4 will cover the LED backlight source inside it, and the rubber buffer ring 42 provided at the bottom of the detection cover 4 will press against the bottom plate 1 or the edge of the LED backlight source, so that the inside of the detection cover 4 is in a dark state without light. In a dark environment without light, the interference of external light on the detection result can be reduced to avoid light pollution, ensuring that the luminous characteristics of the LED backlight source, such as brightness and chromaticity, can be accurately measured, and then the driving component 8 stops.

[0056] Then, the LED backlight source is powered on to make it emit light and continuously switch between different colors. Subsequently, the area detector 5 provided in the detection cover 4 is started to perform a detailed optical brightness detection on the LED backlight source. The area detector 5 divides the LED backlight source into several uniform light-emitting areas, and then performs an optical brightness detection on each horizontal and vertical column of the area. If the light source detection of one horizontal column and one vertical column fails, the area detector 5 will accurately locate the specific light-emitting area through the intersection points of the horizontal and vertical columns.

[0057] Through the test results, if it is found that the number of unqualified light-emitting areas exceeds a preset threshold (quantity), it can be determined that the light emission of the LED backlight source is uneven. This threshold is set according to actual application requirements and quality standards.

[0058] After the detection is completed, the driving member 8 drives the driving shaft 3 to drive the detection cover 4 to move upward, and releases the clamping of the LED backlight source by the clamper 7, thereby completing the detection of the light source on one side.

[0059] Reference Figures 3 to 5Specifically, the area detector 5 includes a tic-tac-toe partition 51 arranged in the detection cover 4. After the detection cover 4 covers the LED backlight source, the tic-tac-toe partition 51 divides the detection cover 4 into a plurality of receiving holes 52 distributed in a matrix. At the same time, the tic-tac-toe partition 51 divides the surface of the LED backlight source into luminous areas corresponding to the receiving holes 52 one by one.

[0060] The light guide block 53 arranged in the accommodating hole 52 will contact the surface of the LED backlight source, and the light source in the corresponding light-emitting area will be derived through the light guide block 53, so that the light guide block 53 changes with the brightness of the LED backlight source, that is, the light of each light-emitting area on the LED backlight source is mapped on the corresponding light guide block 53, so that the light guide block 53 emits light with the corresponding light-emitting area, that is to say, the brightness change of the light guide block 53 is synchronized with the light-emitting area of ​​the LED backlight source.

[0061] A transverse light-transmitting hole 54 is provided between each horizontal row of accommodating holes 52 on the tic-tac-toe partition 51, and a longitudinal light-transmitting hole 55 is provided between each vertical row of accommodating holes 52 on the tic-tac-toe partition 51. The transverse light-transmitting holes 54 and the longitudinal light-transmitting holes 55 on the tic-tac-toe partition 51 are staggered up and down, and the transverse light-transmitting holes 54 and the longitudinal light-transmitting holes 55 allow light to pass through.

[0062] The detection cover 4 is provided with optical sensors 56 corresponding to the transverse light-transmitting holes 54 one by one. The optical sensors 56 can detect the light intensity passing through the transverse light-transmitting holes 54. The light intensity measured by each optical sensor 56 reflects the brightness of the corresponding horizontal column of luminous areas. The brightness of a horizontal column of luminous areas can be evaluated through the detection results of the optical sensors 56. By comparing the light brightness of each horizontal column, it can be detected whether there is a brightness value out of range. If the brightness of a certain horizontal column exceeds or is lower than the average brightness of other horizontal columns, this may indicate that there is unevenness in the luminous area of ​​the horizontal column.

[0063] Similarly, the detection cover 4 is provided with optical sensors 57 corresponding one to one with the longitudinal light holes 55. The optical sensors 57 can detect the light intensity passing through the longitudinal light holes 55. The light intensity measured by each optical sensor 57 reflects the brightness of the corresponding column of luminous areas. The brightness of a column of luminous areas can be evaluated through the detection results of the optical sensors 57. By comparing the light brightness of each column, it can be detected whether there is a brightness value out of range. If the brightness of a column exceeds or is lower than the average brightness of other columns, this may indicate that there is unevenness in the luminous area of ​​the column.

[0064] Through the detection results of the horizontal and vertical columns, the intersection points of the horizontal and vertical columns are used to locate the specific luminous area with uneven luminescence.

[0065] Replay Figure 3For ease of understanding, a coordinate positioning method is used to number the plurality of optical sensors 1 56 from one side to the other, and number them as X1, X2, X3 and X4; a plurality of optical sensors 2 57 are numbered from one side to the other, and number them as Y1, Y2, Y3 and Y4, and the light-emitting areas staggered in horizontal and vertical rows and the corresponding light guide blocks 53 are marked as: X1-Y1, X1-Y2, X1-Y3 and X1-Y4 are horizontal row one, and X2-Y1, X2-Y2, X2-Y3 and X2-Y4 are horizontal row two. X3-Y1, X3-Y2, X3-Y3 and X3-Y4 are the third row, X4-Y1, X4-Y2, X4-Y3 and X4-Y4 are the fourth row; similarly, X1-Y1, X2-Y1, X3-Y1 and X4-Y1 are the first row, X1-Y2, X2-Y2, X3-Y2 and X4-Y2 are the second row, X1-Y3, X2-Y3, X3-Y3 and X4-Y3 are the third row, X1-Y4, X2-Y4, X3-Y4 and X4-Y4 are the fourth row.

[0066] When the light emission of one of the light-emitting areas is uneven, for example, when the light-emitting area X1-Y1 emits uneven light, the brightness of the light guide block 53 in the light-emitting area X1-Y1 is also uneven. At this time, the uneven light will pass through the horizontal light-transmitting hole 54 to make the light in the horizontal column one uneven. At this time, the optical sensor one 56 numbered X1 will detect the uneven light; the same uneven light will pass through the longitudinal light-transmitting hole 55 to make the light in the vertical column one uneven. At this time, the optical sensor two 57 numbered Y1 will detect the uneven light.

[0067] The coordinate positioning method can locate the uneven light in the X1-Y1 luminous area. The coordinate positioning method not only helps to quickly identify the area with uneven light, but also facilitates the recording and analysis of test results, which is helpful for subsequent quality control and improvement, thereby improving the production efficiency and product quality of LED backlight sources.

[0068] Among them, a transverse light guide rod 58 is commonly provided between the light guide blocks 53 in each horizontal row on the tic-tac-toe partition 51, and the transverse light guide rod 58 is located in multiple transverse light-transmitting holes 54 in the same horizontal row. The transverse light guide rod 58 is connected to the optical sensor 56 in the corresponding horizontal row to concentrate the light from the light guide blocks 53 in the same horizontal row and transmit it to the corresponding optical sensor 56.

[0069] Similarly, a longitudinal light guide rod 59 is commonly provided between the light guide blocks 53 in each vertical column on the tic-tac-toe partition 51, and the longitudinal light guide rod 59 is located in a plurality of longitudinal light-transmitting holes 55 in the same vertical column. The longitudinal light guide rod 59 is connected to the optical sensor 2 57 in the corresponding vertical column to concentrate the light from the light guide blocks 53 in the same vertical column and transmit it to the corresponding optical sensor 2 57.

[0070] Reference Figures 6 to 8 Specifically, the clamp 7 includes a plurality of sliding holes 71 symmetrically opened on the base plate 1, a clamping block 72 is slidably arranged in the sliding hole 71, a connecting rod 722 slidably connected to the base plate 1 is arranged at the lower end of the clamping block 72, a clamping rack 73 is symmetrically arranged on the connecting rod 722, and a clamping gear 74 is rotatably arranged on the base plate 1.

[0071] When the detection cover 4 moves downward, the detection cover 4 will drive the support rod 75 set on the detection cover 4 to move together, and the support rod 75 corresponds to the sliding hole 71 one by one. The moving support rod 75 will drive the connecting rack 751 that slides through one end of it, and the connecting rack 751 will drive the clamping gear 74 to rotate by engaging with the clamping gear 74. The rotating clamping gear 74 will engage with the clamping rack 73, so that the connecting rod 722 drives the clamping block 72 to move close to the LED backlight source in the sliding groove, and compress the reset spring 721 set between one end of the clamping block 72 and the sliding hole 71. Multiple clamping blocks 72 will move synchronously to clamp the LED backlight source.

[0072] A protrusion 752 is provided on the connecting rack 751. After multiple clamping blocks 72 move synchronously to clamp the LED backlight source, the detection cover 4 continues to move. Since the clamping block 72 presses against the LED backlight source and cannot move, the clamping rack 73 no longer moves, so that the clamping gear 74 no longer rotates. The connecting rack 751 is relatively stationary under the engagement of the clamping gear 74, and the support rod 75 continues to detect the movement of the detection cover 4 and compresses the clamping spring 753 provided between the protrusion 752 and the support rod 75, so that the clamping spring 753 provides a downward elastic force to the connecting rack 751 through the protrusion 752, so that the connecting rack 751 drives the clamping gear 74 through engagement, ensures that the clamping gear 74 engages with the clamping rack 73 to allow the clamping block 72 to further clamp the LED backlight source, thereby ensuring the stability of the LED backlight source detection process.

[0073] After the detection is completed, the driving member 8 drives the driving shaft 3 to drive the detection cover 4 to move upward, and the detection cover 4 will drive the support rod 75 set on the detection cover 4 to move together, and gradually release the compressed clamping spring 753 until the clamping spring 753 is completely released.

[0074] Afterwards, the support rod 75 will drive the connecting rack 751, and the connecting rack 751 will drive the clamping gear 74 to rotate by meshing with the clamping gear 74. The rotating clamping gear 74 will mesh with the clamping rack 73, so that the connecting rod 722 will drive the clamping block 72 to move away from the LED backlight source in the sliding groove, and gradually release the reset spring 721 set between one end of the clamping block 72 and the sliding hole 71, and multiple clamping blocks 72 will move synchronously to release the LED backlight source.

[0075] Reference Fig. 9Since the LED backlight source has different shapes of length and width, after the clamping block 72 on the long side of the LED backlight source is clamped, the clamping block 72 on the wide side of the LED backlight source has not yet contacted the LED backlight source, and the clamping block 72 that first clamps the long side of the LED backlight source will affect the clamping block 72 that clamps the wide side of the LED backlight source later. This is because after the clamping block 72 on the long side of the LED backlight source is clamped, the clamping block 72 on the wide side of the LED backlight source cannot correct the LED backlight source to ensure that the LED backlight source is located directly below the detection cover 4.

[0076] Therefore, a plurality of clamping holes 76 are provided on the clamping block 72, and a rotating frame 77 is slidably provided in the clamping hole 76. When the clamping block 72 is pressed against the LED backlight source, a roller 771 rotatably provided on the rotating frame 77 will contact the LED backlight source. A spring support frame 78 is provided on the end of the clamping block 72 away from the roller 771. When the roller 771 contacts the LED backlight source, the rotating frame 77 will be driven to retract inward under the clamping force, and the clamping spring 79 provided between the spring support frame 78 and the rotating frame 77 will be compressed.

[0077] When the clamping block 72 that first clamps the long side of the LED backlight source drives the roller 771 to clamp the LED backlight source, the clamping block 72 that clamps the wide side of the LED backlight source will subsequently clamp the LED backlight source, causing the LED backlight source to move between the rollers 771 of the clamping block 72 on the long side of the LED backlight source, and forcing the rollers 771 of the clamping block 72 on the long side of the LED backlight source to rotate to adapt to the movement of the LED backlight source.

[0078] Reference Fig.10 Specifically, the driving member 8 includes a driving gear 81 rotatably arranged on the top plate 2 and threadedly connected to the driving shaft 3. A driving motor 82 is arranged on the top plate 2 through a bracket. A transmission gear 83 meshing with the driving gear 81 is arranged at the driving end of the driving motor 82.

[0079] By starting the driving motor 82, the driving motor 82 will drive the transmission gear 83 set on its driving end to rotate, and the rotating transmission gear 83 will drive the driving gear 81 to rotate together through engagement, and the rotating driving gear 81 will drive the driving shaft 3 to move on the top plate 2 through the thread cooperation with the driving shaft 3, so as to drive the detection cover 4 to move.

[0080] Embodiment 2:

[0081] Reference Fig.11 , Fig.12 , Fig.13 , Fig.14 and Fig.15On the basis of the first embodiment, a photosensitive detector 6 located in the accommodating hole 52 is provided at the bottom of the light guide block 53. After the uneven light-emitting area can be located by the coordinate positioning method, the photosensitive detector 6 in the corresponding light-emitting area will be started, and the photosensitive detector 6 will further detect the LED backlight source in the uneven light-emitting area, locate the specific LED lamp beads with uneven light emission on the LED backlight source, and improve the efficiency and accuracy of the detection.

[0082] Specifically, the photosensitive detector 6 includes a detection frame 61 arranged at the bottom of the light guide block 53 and located in the receiving hole 52. A tic-tac-toe diaphragm 62 is arranged in the detection frame 61. The tic-tac-toe diaphragm 62 divides the detection frame 61 into a plurality of receiving holes 63 distributed in a matrix. At the same time, the tic-tac-toe diaphragm 62 divides the surface of the LED backlight source into light-emitting points corresponding to the receiving holes 63 one by one.

[0083] A focusing block 64 is disposed in the receiving hole 63, and a flexible light guide plate 69 in contact with the focusing block 64 is disposed at the bottom of the receiving hole 63. The flexible light guide plate 69 will contact the surface of the LED backlight source, so that the LED lamp beads on the LED backlight source are located within the light-emitting point.

[0084] The light source of the LED lamp bead in the corresponding light-emitting point is exported through the focusing block 64, so that the focusing block 64 changes with the brightness of the LED lamp bead, that is, the light of each light-emitting point on the LED lamp bead is mapped on the corresponding focusing block 64, so that the light guide block 53 emits light with the corresponding light-emitting area, that is, the brightness change of the light guide block 53 is synchronized with the light-emitting point of the focusing block 64.

[0085] A transverse light-guiding hole 621 is provided between each horizontal row of receiving holes 63 on the tic-tac-toe diaphragm 62, and a longitudinal light-guiding hole 622 is provided between each vertical row of receiving holes 63 on the tic-tac-toe diaphragm 62. The transverse light-guiding holes 621 and the longitudinal light-guiding holes 622 on the tic-tac-toe diaphragm 62 are staggered up and down; the transverse light-guiding holes 621 and the longitudinal light-guiding holes 622 allow light to pass through.

[0086] The detection frame 61 is provided with photosensitive sensors 65 corresponding to the horizontal light guide holes 621 one by one. The light intensity measured by each photosensitive sensor 65 reflects the brightness of the corresponding horizontal column of light-emitting points. The brightness of the light-emitting points in a horizontal column can be evaluated through the detection results of the photosensitive sensors 65. By comparing the light brightness of each horizontal column, it can be detected whether there is a brightness value out of range. If the brightness of a certain horizontal column exceeds or is lower than the average brightness of other horizontal columns, this may indicate that the light-emitting points in the horizontal column are uneven.

[0087] Similarly, the detection frame 61 is provided with photosensitive sensors 66 corresponding one to one with the longitudinal light guide holes 622. The light intensity measured by each photosensitive sensor 66 reflects the brightness of the corresponding column of light-emitting points. The brightness of the light-emitting points in a column can be evaluated through the detection results of the photosensitive sensors 66. By comparing the light brightness of each column, it can be detected whether there is a brightness value out of range. If the brightness of a column exceeds or is lower than the average brightness of other columns, this may indicate that there is unevenness in the light-emitting points in the column.

[0088] Through the detection results of the horizontal and vertical columns, the intersection points of the horizontal and vertical columns are used to locate the specific luminous points with uneven luminescence.

[0089] Refer to the figure Fig.13 For ease of understanding, the coordinate positioning method is used to number the plurality of photosensitive sensors 65 from one side to the other, numbered as A, B, C and D; the plurality of photosensitive sensors 66 are numbered from one side to the other, numbered as 1, 2, 3 and 4, and the light-emitting areas staggered in horizontal and vertical rows and the corresponding light guide blocks 53 are marked as: A-1, A-2, A-3 and A-4 are the first horizontal row, B-1, B-2, B-3 and B- 4 is the second row, C-1, C-2, C-3 and C-4 are the third row, D-1, D-2, D-3 and D-4 are the fourth row; similarly, 1-A, 1-B, 1-C and 1-D are the first row, 2-A, 2-B, 2-C and 2-D are the second row, 3-A, 3-B, 3-C and 3-D are the third row, and 4-A, 4-B, 4-C and 4-D are the fourth row.

[0090] When the light emission of one of the light-emitting points is uneven, for example, when the light-emitting area A-1 emits uneven light, the brightness of the focusing block 64 in the light-emitting area A-11 is also uneven. At this time, the uneven light will pass through the horizontal light-guiding hole 621 to make the light in the first horizontal column uneven. At this time, the photosensitive sensor 1 65 numbered A will detect the uneven light; the same uneven light will pass through the vertical light-guiding hole 622 to make the light in the first vertical column uneven. At this time, the photosensitive sensor 2 66 numbered 1 will detect the uneven light.

[0091] The coordinate positioning method can locate the uneven light at the light point marked as A-1. The coordinate positioning method not only helps to quickly identify LED lamp beads with uneven light emission, but also facilitates the recording and analysis of test results, which is helpful for subsequent quality control and improvement, thereby improving the production efficiency and product quality of LED backlight sources.

[0092] Among them, a transverse optical fiber 67 is commonly installed between the focusing blocks 64 in each horizontal row on the cross-shaped diaphragm 62, and the transverse optical fiber 67 is located in multiple transverse light-guiding holes 621 in the same horizontal row. The transverse optical fiber 67 is connected to the photosensor 1 65 in the corresponding horizontal row to concentrate the light from the focusing blocks 64 in the same horizontal row and transmit it to the corresponding photosensor 1 65.

[0093] Similarly, a longitudinal optical fiber 68 is commonly provided between the focusing blocks 64 in each vertical column on the cross-shaped diaphragm 62, and the longitudinal optical fiber 68 is located in a plurality of longitudinal light-guiding holes 622 in the same vertical column. The longitudinal optical fiber 68 is connected to the corresponding horizontal column of photosensor 2 66 to concentrate the light from the focusing blocks 64 in the same horizontal column and transmit it to the corresponding photosensor 2 66.

[0094] The implementation principle of the present invention is:

[0095] (1): When performing a uniformity test on an LED backlight source, first place the LED backlight source on the bottom plate 1, then start the driving member 8 provided on the top plate 2, and drive the driving shaft 3 sliding through the top plate 2 to move downward through the driving member 8.

[0096] (2): The moving driving shaft 3 will drive the detection cover 4 set at the lower end of the driving shaft 3 to move together, and a number of guide rods 41 sliding through the top plate 2 will move together through the connection with the detection cover 4. The guide rods 41 will guide the movement of the detection cover 4 to ensure the stability of the movement of the detection cover 4.

[0097] (3): The downward movement of the detection cover 4 will drive the connecting rack 751 to move together through the support rod 75, and the connecting rack 751 will drive the clamping gear 74 to rotate by meshing with the clamping gear 74. The rotating clamping gear 74 will mesh with the clamping rack 73, so that the connecting rod 722 drives the clamping block 72 to move close to the LED backlight source in the sliding groove and compress the reset spring 721, so that the multiple clamping blocks 72 will move synchronously to clamp the LED backlight source.

[0098] (4): After the clamp 7 completes the clamping, the detection cover 4 will cover the LED backlight source inside it, and the buffer ring 42 set at the bottom of the detection cover 4 will press on the bottom plate 1 or the edge of the LED backlight source, so that the inside of the detection cover 4 is in a dark state without light. In a dark environment without light, the interference of external light on the detection result can be reduced to avoid light pollution, ensuring that the luminous characteristics of the LED backlight source, such as brightness and chromaticity, can be accurately measured, and then the driving component 8 stops.

[0099] (5): Then, the LED backlight source is powered on, so that the LED backlight source emits light and continuously switches different colors, and then the area detector 5 set in the detection cover 4 is started.

[0100] (6): The area detector 5 divides the LED backlight into several uniform light-emitting areas, and then performs optical brightness detection on each horizontal and vertical column of the area. If the light source detection of one horizontal and one vertical column fails, the area detector 5 will accurately locate the specific light-emitting area through the intersection of the horizontal and vertical columns.

[0101] (7): After the uneven light-emitting area is located by the coordinate positioning method, the photosensitive detector 6 in the corresponding light-emitting area will be started. The photosensitive detector 6 will further detect the LED backlight source in the uneven light-emitting area and locate the specific LED lamp beads with uneven light on the LED backlight source, thereby improving the efficiency and accuracy of the detection.

[0102] (8): The area detector 5 and the photosensitive detector 6 locate the area with uneven light through the coordinate positioning method, which not only helps to quickly identify the area with uneven light emission, but also facilitates the recording and analysis of test results, which is helpful for subsequent quality control and improvement, thereby improving the production efficiency and product quality of LED backlight sources.

[0103] (9): After the detection is completed, the driving member 8 drives the driving shaft 3 to drive the detection cover 4 to move upward, so that the connecting rod 722 drives the clamping block 72 to move away from the LED backlight source in the sliding groove, and releases the reset spring 721 set between one end of the clamping block 72 and the sliding hole 71 in the middle. Multiple clamping blocks 72 will move synchronously to release the LED backlight source, thereby completing the one-side light source detection.

[0104] The embodiments of this specific implementation method are all preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. An LED backlight source luminous uniformity testing device, comprising a bottom plate (1), a plurality of columns (11) being arranged on the bottom plate (1), a top plate (2) being arranged at the upper ends of the plurality of columns (11), characterized in that: A driving shaft (3) is slidably provided on the top plate (2), a detection cover (4) is provided at the lower end of the driving shaft (3), and a region detector (5) is provided inside the detection cover (4); The area detector (5) comprises a well-shaped partition (51) arranged in a detection cover (4), wherein the well-shaped partition (51) divides the inside of the detection cover (4) into a plurality of receiving holes (52) distributed in a matrix, and a light guide block (53) is arranged in each of the receiving holes (52).

2. The LED backlight source luminous uniformity testing device according to claim 1, characterized in that: The area detector (5) further comprises a transverse light-transmitting hole (54) provided between each horizontal row of receiving holes (52) on the tic-tac-toe partition (51), a longitudinal light-transmitting hole (55) provided between each vertical row of receiving holes (52) on the tic-tac-toe partition (51), and the transverse light-transmitting holes (54) and the longitudinal light-transmitting holes (55) on the tic-tac-toe partition (51) are staggered up and down; The detection cover (4) is provided with an optical sensor 1 (56) corresponding one-to-one to the transverse light-transmitting holes (54), and the detection cover (4) is provided with an optical sensor 2 (57) corresponding one-to-one to the longitudinal light-transmitting holes (55).

3. The LED backlight uniformity testing device according to claim 2, characterized in that: A transverse light guide rod (58) is provided between the light guide blocks (53) in each horizontal row on the tic-tac-toe partition plate (51), and the transverse light guide rod (58) is located in a plurality of transverse light transmission holes (54) in the same horizontal row and is connected to an optical sensor (56) in the corresponding horizontal row; A longitudinal light guide rod (59) is provided between the light guide blocks (53) in each longitudinal column on the tic-tac-toe partition plate (51), and the longitudinal light guide rod (59) is located in a plurality of longitudinal light-transmitting holes (55) in the same longitudinal column and is connected to the second optical sensor (57) in the corresponding longitudinal column.

4. The LED backlight luminous uniformity testing device according to claim 1, characterized in that: The bottom of the light guide block (53) is provided with a photosensitive detector (6) located in the receiving hole (52); The photosensitive detector (6) comprises a detection frame (61) arranged at the bottom of the light guide block (53) and located in the receiving hole (52); a cross-shaped diaphragm (62) is arranged in the detection frame (61); the cross-shaped diaphragm (62) divides the detection frame (61) into a plurality of receiving holes (63) distributed in a matrix; and a light focusing block (64) is arranged in the receiving hole (63).

5. The LED backlight luminous uniformity testing device according to claim 4, characterized in that: A transverse light guide hole (621) is provided between each horizontal row of receiving holes (63) on the well-shaped diaphragm (62), a longitudinal light guide hole (622) is provided between each vertical row of receiving holes (63) on the well-shaped diaphragm (62), and the transverse light guide holes (621) and the longitudinal light guide holes (622) on the well-shaped diaphragm (62) are staggered up and down; The detection frame (61) is provided with a photosensitive sensor 1 (65) corresponding one-to-one to the transverse light guide holes (621), and the detection frame (61) is provided with a photosensitive sensor 2 (66) corresponding one-to-one to the longitudinal light guide holes (622).

6. The LED backlight source luminous uniformity testing device according to claim 5, characterized in that: A transverse optical fiber (67) is provided between the light-gathering blocks (64) in each horizontal row on the cross-shaped diaphragm (62), and the transverse optical fiber (67) is located in a plurality of transverse light-guiding holes (621) in the same horizontal row and is connected to a photosensitive sensor (65) in the corresponding horizontal row; A longitudinal optical fiber (68) is provided between the light-gathering blocks (64) in each vertical column on the well-shaped diaphragm (62), and the longitudinal optical fiber (68) is located in a plurality of longitudinal light-guiding holes (622) in the same vertical column and is connected to the second photosensitive sensor (66) in the corresponding vertical column.

7. The LED backlight source luminous uniformity testing device according to claim 4, characterized in that: The bottom of the receiving hole (63) is provided with a flexible light guide plate (69) in contact with the light focusing block (64).

8. The LED backlight source luminous uniformity testing device according to claim 1, characterized in that: A clamp (7) is provided on the bottom plate (1); The clamp (7) comprises a plurality of sliding holes (71) symmetrically provided on the bottom plate (1), a clamping block (72) being slidably provided in the sliding hole (71), a return spring (721) being provided between one end of the clamping block (72) and the sliding hole (71), a connecting rod (722) being slidably connected to the bottom plate (1) being provided at the lower end of the clamping block (72), a clamping rack (73) being provided on the connecting rod (722), and a clamping gear (74) being rotatably provided on the bottom plate (1) and meshing with the clamping rack (73); The detection cover (4) is provided with a support rod (75) corresponding to the sliding hole (71) one by one, and one end of the support rod (75) is slidably penetrated by a connecting rack (751) meshing with a clamping gear (74), and a protrusion (752) is provided on the connecting rack (751), and a clamping spring (753) is provided between the protrusion (752) and the support rod (75).

9. The LED backlight source luminous uniformity testing device according to claim 8, characterized in that: The clamping block (72) is provided with a clamping hole (76), a rotating frame (77) is slidably provided in the clamping hole (76), a roller (771) is rotatably provided on the rotating frame (77), a spring support frame (78) is provided at one end of the clamping block (72) away from the roller (771), and a clamping spring (79) is provided between the spring support frame (78) and the rotating frame (77).

10. The LED backlight source luminous uniformity testing device according to claim 1, characterized in that: A buffer ring (42) is provided at the bottom of the detection cover (4).

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