Optical detection device for LED panel and detection method thereof

Abstract

The application provides an optical detection device and detection method of an LED panel, which comprises a linear sliding table, an upper feeding mechanism and a detection mechanism are installed on the linear sliding table at intervals, the upper feeding mechanism is used for moving the LED panel on an upper feeding conveying line to a detection table, the detection mechanism can detect the optical performance of the LED panel and move the LED panel on the detection table to a lower feeding conveying line, the linear sliding table is used for alternately moving the upper feeding mechanism and the detection mechanism above the detection table; a backlight plate is placed on the detection table, and a detection electrode is also fixed; a first golden finger of the LED panel, a second golden finger of the backlight plate and the detection electrode are arranged from top to bottom; and the detection electrode is connected with a power supply; a corner cylinder is installed on the side of the detection table, an insulating block and a pressing block are fixed on the corner cylinder, the insulating block is below the pressing block and the projections of the insulating block and the pressing block on a horizontal plane are staggered. The application has high detection efficiency and precision, compact structure and long service life.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of display product testing, and particularly relates to an optical detection device for an LED panel and a detection method thereof. BACKGROUND

[0002] The quality of a liquid crystal display screen is first determined by its panel, because the quality of the panel directly affects the viewing effect of the picture. The liquid crystal display panel is provided with a surface light source by a backlight plate, and the light source of the backlight plate is an LED. After the display panel is assembled, the backlight plate needs to be lit to detect the display effect of the panel.

[0003] For example, the patent with the announcement number CN107576481B discloses a detection method for an optical panel, which comprises selecting at least one feature point on the optical panel, moving the optical panel to an optical reading station to read the feature point and position the optical panel, moving the positioned optical panel to a powered detection station, contacting a powered power probe with a contact point on the optical panel to light up the optical panel, and then imaging and comparing the lighted optical panel. The lighting, imaging and comparing of the optical panel are sequentially performed in the powered detection station, and the optical reading station and the powered detection station are located on the same linear path. In this way, the problem that the detection capacity cannot be effectively improved due to the overcomplication of the traditional detection process or mechanism of the optical panel is solved.

[0004] However, in the existing display panel detection, the display panel needs to be moved between the feeding station, the detection station and the discharging station, the moving path of the conveying mechanism is long, and the reset path is empty, which reduces the detection efficiency.

[0005] In addition, the gold fingers of the backlight plate and the display panel need to be connected with the detection circuit, and the usual detection method is to weld the gold fingers of the backlight plate on the detection electrode, so that the backlight plate remains always on. This makes the LED of the backlight plate easy to be high-temperature, and the optical films such as the brightness enhancement film and the diffusion film inside the backlight plate expand and deform, resulting in abnormal display effect such as ripples of the surface light source, which affects the accuracy of the detection result. SUMMARY

[0006] The purpose of the present application is to provide an optical detection device for an LED panel and a detection method thereof to solve the above technical problems.

[0007] The present application provides the following technical solutions:

[0008] An optical detection device for an LED panel, comprising a linear sliding table, a detection table, a feeding mechanism and a detection mechanism.

[0009] The left and right sides of the detection table are respectively provided with a feeding conveying line and a discharging conveying line.

[0010] The linear slide is installed on the gantry, and an upper feeding mechanism and a detection mechanism are installed on the slider of the linear slide at intervals, the upper feeding mechanism is used for moving the LED panel on the upper feeding conveying line to the detection table, the detection mechanism can detect the optical performance of the LED panel and move the LED panel on the detection table to the lower feeding conveying line, and the linear slide is used for alternately moving the upper feeding mechanism and the detection mechanism above the detection table.

[0011] The detection table is provided with a backlight plate, and the LED panel is closely attached to the backlight plate during detection; the detection table is also fixed with a detection electrode, the first gold finger of the LED panel, the second gold finger of the backlight plate and the detection electrode are arranged from top to bottom, and the detection electrode is connected to a power supply.

[0012] A corner cylinder is installed on the side of the detection table, an insulating block and a pressing block are fixed on the piston rod of the corner cylinder, the insulating block is below the pressing block, and the projections of the insulating block and the pressing block on the horizontal plane are staggered, before detection, the insulating block is inserted between the second gold finger and the detection electrode to disconnect the second gold finger and the detection electrode; during detection, the piston rod of the corner cylinder rotates, the insulating block is moved away from above the detection electrode, the pressing block is rotated above the first gold finger, and then the first gold finger and the second gold finger are pressed on the detection electrode, so that the first gold finger forms a first detection loop with the detection electrode and the power supply, and the second gold finger forms a second detection loop with the detection electrode and the power supply.

[0013] The frame part of the LED panel is supported by an iron frame, a positioning block is installed on the detection table, and an electromagnet is installed on the inner side of the positioning block.

[0014] Preferably, the projections of the pressing block and the insulating block on the horizontal plane form an angle of 180°.

[0015] Preferably, during detection, there is a gap with a sloping surface between the FPC root of the backlight plate and the detection table; the insulating block includes a block body and a guide part protruding from one side of the front end of the block body, before the block body is rotated into the second gold finger and the detection electrode by the corner cylinder, the guide part is first inserted into the gap to lift the FPC of the backlight plate and separate the second gold finger from the detection electrode.

[0016] Preferably, the guide part protrudes upward relative to the block body.

[0017] Preferably, the cross section of the guide part is wedge-shaped, and the top wall of the guide part away from the block body side inclines downward.

[0018] Preferably, the guiding part does not contact the second gold finger.

[0019] Preferably, the outer frame part of the backlight panel is also covered by the iron frame, and the electromagnet in the positioning block can simultaneously attract the iron frame of the backlight panel and the LED panel, so that the backlight panel and the LED panel are positioned by the positioning block.

[0020] Preferably, the feeding mechanism comprises a first lifting cylinder and a first suction disc group mounted on the first lifting cylinder, the first suction disc group comprises a plurality of suction discs connected to a negative pressure generator, and the first suction disc group can attract the LED panel.

[0021] Preferably, the detection mechanism comprises a rotary cylinder, a second lifting cylinder, a visual detection assembly and a second suction disc group, the rotary cylinder is mounted on the sliding block of the linear slide, the second lifting cylinder is mounted on the piston rod of the rotary cylinder, the second suction disc group is mounted on the piston rod of the second lifting cylinder, the second suction disc group also comprises a plurality of suction discs connected to a negative pressure generator, and the second suction disc group can attract the LED panel; the visual detection assembly is mounted on the second lifting cylinder and located on the side opposite to the second suction disc group, and the visual detection assembly can detect the brightness, chromaticity and moire of the LED panel.

[0022] An optical detection method of an LED panel, comprising the following steps:

[0023] The feeding conveying line intermittently conveys the LED panel to the feeding station;

[0024] The linear slide moves the feeding mechanism to the upper side of the feeding station, the first suction disc group descends and attracts the LED panel, and then ascends, and the linear slide moves the feeding mechanism to the upper side of the detection station;

[0025] The first suction disc group breaks the vacuum after placing the LED panel on the detection table, the linear slide moves the feeding mechanism to the upper side of the feeding station again, the detection mechanism is synchronously moved to the upper side of the detection station, and the visual detection assembly of the detection mechanism faces downward;

[0026] The electromagnet is powered on to attract the LED panel and the backlight panel to the positioning block to accurately position the LED panel and the backlight panel;

[0027] The corner cylinder is actuated to rotate the pressing block to the upper side of the first gold finger of the LED panel, and then press the pressing block to press the first gold finger and the second gold finger to the detection electrode, the backlight panel provides light source for the LED panel after being powered on, and the LED panel displays the picture after being powered on;

[0028] The visual detection assembly starts to detect the optical performance of the LED panel;

[0029] After detection, the visual detection assembly sends the detection result to the host computer, the rotary cylinder rotates 180°, and the second suction disc group faces downward;

[0030] The electromagnet is powered off, the second suction disc group is lowered to adsorb the LED panel, and then is raised to reset;

[0031] The linear module repeats the feeding process, and at the same time, the detection mechanism moves to the unloading station, the second suction disc group places the LED panel on the unloading conveying line, and a detection cycle is completed;

[0032] The above detection cycle is repeated to continuously detect the LED panel.

[0033] The beneficial effects of the present application are:

[0034] The present application utilizes a linear slide, a feeding mechanism and a detection mechanism to cooperate to continuously and automatically detect the LED panel, wherein the feeding mechanism and the detection mechanism can alternately move above the detection table, the feeding conveying line and the unloading conveying line are respectively located on the two sides of the detection table, therefore, when the feeding mechanism takes the material at the feeding conveying line, the detection mechanism detects at the detection table, when the feeding mechanism moves and loads the LED panel to the detection table, the detection mechanism moves and loads the detected LED panel to the unloading conveying line, thus, the detection cycle is compact and orderly, without redundant movement, and the work efficiency is improved.

[0035] The present application is provided with a rotary cylinder, the piston rod of the rotary cylinder is fixed with an insulating block and a pressing block, the insulating block is located below the pressing block, and the projections of the insulating block and the pressing block on the horizontal plane are staggered. Before starting detection, the insulating block is inserted between the second gold finger and the detection electrode, so that the circuit between the second gold finger and the detection electrode is broken, thus the backlight panel does not emit light before detection, avoiding the heat generation and brightness attenuation of the backlight panel caused by long-time lighting, improving the detection accuracy of the LED panel and prolonging the service life of the backlight panel. During detection, the piston rod of the rotary cylinder rotates to move the insulating block away from above the detection electrode, rotates the pressing block above the first gold finger, and then presses the first gold finger and the second gold finger on the detection electrode, so that the first gold finger forms a first detection loop with the detection electrode and the power supply, and the second gold finger forms a second detection loop with the detection electrode and the power supply, the first detection loop lights the backlight panel to provide a surface light source for the LED panel display, and the second detection loop provides a driving current for the LED panel to display the set picture. The present application replaces two driving devices with one driving device, i.e. the rotary cylinder, to successively implement the two actions of blocking the second gold finger and the detection electrode, and pressing the first gold finger and the second gold finger on the detection electrode, so that the structure of the detection device is more compact and the energy consumption is lower. BRIEF DESCRIPTION OF DRAWINGS

[0036] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used in conjunction with embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0037] Figure 1 This is a schematic diagram of the structure of the present invention;

[0038] Figure 2 This is a top view of the detection station of the present invention;

[0039] Figure 3 yes Figure 2 Enlarged structural diagram at point A;

[0040] Figure 4 This is a schematic diagram of the insulating block of the present invention inserted between the second gold finger and the detection electrode;

[0041] Figure 5 This is a schematic diagram of the pressure block pressing the first and second gold fingers of the present invention;

[0042] Figure 6 yes Figure 3 Schematic diagram of the cross-sectional structure at point BB.

[0043] The components in the diagram are labeled as follows: 1. Linear slide; 2. Inspection table; 3. Feeding mechanism; 4. Inspection mechanism; 5. Feeding conveyor line; 6. Unloading conveyor line; 7. Gantry frame; 8. First lifting cylinder; 9. First suction cup assembly; 10. LED panel; 11. Backlight panel; 12. Rotary cylinder; 13. Second lifting cylinder; 14. Vision inspection component; 15. Second suction cup assembly; 16. Positioning groove; 17. Inspection electrode; 18. First gold finger; 19. Second gold finger; 20. Corner cylinder; 21. Insulating block; 22. Pressing block; 23. Positioning block; 24. Electromagnet; 25. Iron frame; 26. Connecting part; 27. Gap; 28. Block body; 29. ​​Guide part; 30. Thermally conductive silicone. Detailed Implementation

[0044] Example 1

[0045] like Figures 1 to 6 As shown, an optical inspection device for an LED panel includes a linear slide 1, an inspection stage 2, a feeding mechanism 3, and an inspection mechanism 4.

[0046] Please refer to Figure 1 The testing platform 2 is equipped with a loading conveyor line 5 and a unloading conveyor line 6 on its left and right sides, respectively. The loading conveyor line 5 can intermittently convey LED panels 10 towards the testing platform 2, and the unloading conveyor line 6 can intermittently send the LED panels 10 on the testing platform to the next process. The loading conveyor line 5 and the unloading conveyor line 6 are respectively equipped with loading stations and unloading stations, and the position of the testing platform 2 corresponds to the testing station.

[0047] The linear slide 1 is horizontally mounted on the portal frame 7, and the feeding mechanism 3 and the detecting mechanism 4 are mounted on the slider of the linear slide 1 at intervals. The distance between the feeding mechanism 3 and the detecting mechanism 4, the distance between the feeding station and the detecting station, and the distance between the detecting station and the discharging station are all the same.

[0048] The feeding mechanism 3 is used to move the LED panel 10 on the feeding conveying line 5 to the detecting table 2. The detecting mechanism 4 can detect the optical performance of the LED panel 10, and move the LED panel on the detecting table 2 to the discharging conveying line 6. The linear slide 1 can alternately move the feeding mechanism 3 and the detecting mechanism 4 above the detecting station.

[0049] Specifically, the feeding mechanism 3 comprises a first lifting cylinder 8 and a first suction disc group 9 mounted on the first lifting cylinder 8. The first lifting cylinder 8 is mounted on the slider of the linear slide 1, and the first suction disc group 9 comprises a plurality of suction discs connected to a negative pressure generator. The first suction disc group 9 can adsorb the LED panel 10.

[0050] The detecting mechanism 4 comprises a rotary cylinder 12, a second lifting cylinder 13, a visual detection assembly 14, and a second suction disc group 15. The rotary cylinder 12 is mounted on the slider of the linear slide 1, the second lifting cylinder 13 is mounted on the piston rod of the rotary cylinder 12, and the second suction disc group 15 is mounted on the piston rod of the second lifting cylinder 13. The second suction disc group 15 also comprises a plurality of suction discs connected to a negative pressure generator, and can adsorb the LED panel 10. The visual detection assembly 14 is mounted on the second lifting cylinder 13 and located on the side opposite to the second suction disc group 15. The visual detection assembly 14 can detect the brightness, chromaticity and Moiré of the LED panel 10, and comprises a split-mounted visual camera and an illuminometer.

[0051] Please refer to Figures 2 to 5 , the detecting table 2 is provided with a positioning groove 16, and the backlight panel 11 is placed in the positioning groove 16. The detecting table 2 is also fixed with a detecting electrode 17, which comprises a positive electrode and a negative electrode, and is connected to a power supply. During detection, the LED panel 10 is tightly attached to the backlight panel 11, and the first gold finger 18 of the LED panel 10, the second gold finger 19 of the backlight panel, and the detecting electrode 17 are arranged in sequence from top to bottom. The first gold finger 18 and the second gold finger 19 both have positive electrodes and negative electrodes corresponding to the detecting electrode.

[0052] A rotary cylinder 20 is mounted on the side edge of the detecting table 2. An insulating block 21 and a pressing block 22 are fixed on the piston rod of the rotary cylinder 20. The insulating block 21 is located below the pressing block 22, and the projections of the insulating block 21 and the pressing block 22 on the horizontal plane are staggered with each other, preferably they form an angle of 180°. The pressing block 22 is also made of insulating material.

[0053] As shown in Figure 4 Before detection, the insulating block 21 is inserted between the second gold finger 19 and the detection electrode 17, so that the second gold finger 19 is disconnected from the detection electrode 17, and the backlight panel 11 is not lit. As shown in Figure 5 During detection, the piston rod of the rotary cylinder 20 rotates, moves the insulating block 21 away from above the detection electrode 17, rotates the pressing block 22 to above the first gold finger 18, presses the pressing block 22, and then presses the first gold finger 18 and the second gold finger 19 tightly on the detection electrode 17, so that the first gold finger 18 forms a first detection circuit with the detection electrode 17 and the power supply, and the second gold finger 19 forms a second detection circuit with the detection electrode 17 and the power supply.

[0054] Please refer to Figure 2 The frame parts of the LED panel 10 and the backlight panel 11 are respectively covered and supported by the iron frame 25. The positioning block 23 is installed on the detection table 2, and the positioning block 23 is preferably L-shaped. The inner side of the positioning block 23 is provided with a plurality of electromagnets 24, and the electromagnets 24 are connected to the power supply. When the electromagnets 24 are powered on, they can simultaneously attract the iron frames of the backlight panel 11 and the LED panel 10, so that the backlight panel 11 and the LED panel 10 are both accurately positioned by the same positioning block, improving the positioning accuracy. It can avoid the appearance of Moire fringes or Newton rings between the prism sheets of the LED panel 10 and the backlight panel 11 due to slight angle difference, and ensure the accuracy of the display effect. On the other hand, the electromagnets 24 of the embodiment attract the iron frame 25 with a rigid structure from the side, and do not need to additionally configure a pressing clamp to press the LED panel and the backlight panel during the detection process, avoiding the damage of the clamp to the fragile LED panel and the backlight panel, and reducing the destructive detection.

[0055] The motors of the feeding conveying line 5 and the discharging conveying line 6, the linear slide table 1, the first lifting cylinder 8, the electromagnetic valves of the first suction disc group 9, the rotary cylinder 12, the second lifting cylinder 13, the electromagnetic valves of the second suction disc group 15, the visual detection assembly 14, and the rotary cylinder 20 are all connected to the controller, and they are controlled by the controller to work cooperatively at a set action rhythm.

[0056] The optical detection method of the LED panel includes the following steps:

[0057] The feeding conveying line 5 intermittently conveys the LED panel 10 to the feeding station and then pauses;

[0058] The linear slide table 1 moves the feeding mechanism 3 to directly above the feeding station, the first lifting cylinder 8 drives the first suction disc group 9 to move downward and then upward after absorbing the LED panel 10, and then the linear slide table 1 moves the feeding mechanism 3 to above the detection station;

[0059] The first lifting cylinder 8 drives the first suction cup group 9 to move downward, and places the LED panel 10 on the detection table 2 after breaking the vacuum. Then the first suction cup group 9 moves upward, and the linear slide table 1 moves the feeding mechanism 3 to the upper part of the feeding station again. The detection mechanism 4 moves to the upper part of the detection station synchronously, and the visual detection assembly 14 of the detection mechanism 4 faces downward;

[0060] The electromagnet 24 is powered on to adsorb the LED panel 10 and the backlight plate 11 on the positioning block 23 to accurately position and fix the LED panel 10 and the backlight plate 11;

[0061] The corner cylinder 20 is actuated to rotate the pressing block 22 to the upper part of the first gold finger 19 of the LED panel 10, and then press the pressing block 22 to press the first gold finger 18 and the second gold finger 19 tightly on the detection electrode 17. The first detection circuit and the second detection circuit are respectively turned on. The backlight plate 11 is powered on to provide light source for the LED panel. The LED panel 10 is powered on to display the picture;

[0062] The visual detection assembly 14 starts to detect the optical performance of the LED panel, such as brightness, chromaticity and Moire fringe;

[0063] After the detection is completed, the visual detection assembly 14 sends the detection result to the host computer. The host computer stores and analyzes the detection data and images, and generates a detection report. The controller controls the rotary cylinder 20 to rotate 180°, and the second suction cup group 15 faces downward;

[0064] The electromagnet 24 is powered off, and the second lifting cylinder 13 drives the second suction cup group 15 to move downward. The LED panel 10 is adsorbed by the second suction cup group 15, and then the second lifting cylinder 13 drives the second suction cup group 15 to move upward to reset;

[0065] The feeding conveying line 5 moves the next LED panel to the feeding station, the linear module 1 repeats the feeding process of the feeding mechanism 3, and the detection mechanism 4 moves to the discharging station at the same time. The second lifting cylinder drives the second suction cup group 15 to move downward, and places the LED panel 10 on the discharging conveying line 6. Then the second suction cup group 15 moves upward to reset, and completes a detection cycle;

[0066] The above detection cycle is repeated to continuously detect the LED panel.

[0067] Example 2

[0068] Please refer to Figure 5 and Figure 6The part of the FPC of the backlight panel that extends outside the backlight panel is defined as the connecting part 26 in this embodiment, and the first gold finger 19 is located at the free end of the connecting part 26. Since there is a distance between the FPC and the bottom surface of the backlight panel in the height direction, the connecting part 26 is automatically deformed downward after being pressed during the detection process, so that there is a sloped gap 27 between the root of the connecting part 26 and the detection table 2.

[0069] The difference between this embodiment and embodiment 1 is that the insulating block 21 includes a block body 28 and a guide part 29 protruding from the front end side of the block body 28, and the cross section of the guide part 29 is approximately triangular. Before the block body 28 is rotated into the second gold finger 19 and the detection electrode 17 by the corner cylinder 20, the guide part 29 is first inserted into the gap 27 to lift the connecting part 26 of the FPC of the backlight panel, so as to separate the second gold finger 19 from the detection electrode 17, and the block body 28 can be smoothly inserted between the second gold finger 19 and the detection electrode 17. The corner cylinder 20 is a cylinder that can rotate by 360°.

[0070] The guide part 29 protrudes upward relative to the block body 28, so that the guide part 29 can more effectively lift the connecting part 26 of the FPC. The guide part 29 has a three-pyramid appearance, and the top wall of the guide part 29 that is away from the block body 28 is inclined downward, so that the guide part 29 can be more smoothly inserted into the above-mentioned gap 27, and then gradually lift the connecting part 26.

[0071] The guide part 29 does not contact the second gold finger 19, so as to avoid the second gold finger 19 being frequently scratched and broken by the guide part 29.

[0072] In this embodiment, the simultaneously three-pyramid guide part 29 is arranged on the insulating block 21, the guide part 29 is first inserted into the sloped gap 27 between the root of the connecting part 26 and the detection table 2, so as to lift the connecting part 26, separate the second gold finger 19 from the detection electrode 17, and then, with the continuous rotation of the corner cylinder 20, the block body 28 is partially inserted between the second gold finger 19 and the detection electrode 17, so as to prevent the block body 28 from interfering with the second gold finger 19 that is closely attached to the detection electrode 17, and ensure the continuity and reliability of the detection operation. At the same time, the arrangement of the guide part 29 protects the fragile second gold finger 19, and prevents the block body 28 from directly colliding with and extruding the second gold finger 19 to break the second gold finger 19.

[0073] In this embodiment, the heat-conducting silica gel 30 is pasted on the back of the backlight panel, and the heat-conducting silica gel 30 is located directly below the LED of the backlight panel, so as to absorb the heat of the light-emitting LED and prolong the service life of the backlight panel.

[0074] The other structures of this embodiment are the same as those of embodiment 1.

[0075] The above merely describes the preferred embodiments of the present application and is not used to limit the present application, and although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions recorded in the foregoing embodiments, or equivalently replace some technical features thereof. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An optical inspection device for an LED panel, characterized in that, Includes linear slide, testing table, feeding mechanism and testing mechanism; The testing platform is equipped with a loading conveyor line and a unloading conveyor line on its left and right sides, respectively. The linear slide is mounted on a gantry frame. A feeding mechanism and a detection mechanism are installed at intervals on the slider of the linear slide. The feeding mechanism is used to transfer the LED panel on the feeding conveyor line to the detection table. The detection mechanism can detect the optical performance of the LED panel and transfer the LED panel on the detection table to the unloading conveyor line. The linear slide is used to alternately move the feeding mechanism and the detection mechanism above the detection table. A backlight panel is placed on the testing platform, and the LED panel is in close contact with the backlight panel during testing. A testing electrode is also fixed on the testing platform. The first gold finger of the LED panel, the second gold finger of the backlight panel, and the testing electrode are arranged from top to bottom. The testing electrode is connected to a power supply. A corner cylinder is installed on the side of the testing platform. An insulating block and a pressure block are fixed on the piston rod of the corner cylinder. The insulating block is located below the pressure block, and the projections of the insulating block and the pressure block on the horizontal plane are offset from each other. Before the test begins, the insulating block is inserted between the second gold finger and the testing electrode to disconnect the second gold finger from the testing electrode. During the test, the piston rod of the corner cylinder rotates, moving the insulating block away from the top of the testing electrode and rotating the pressure block above the first gold finger. Then, the first and second gold fingers are pressed tightly onto the testing electrode, forming a first testing circuit between the first gold finger, the testing electrode, and the power supply, and a second testing circuit between the second gold finger, the testing electrode, and the power supply. The frame of the LED panel is covered and supported by an iron frame. A positioning block is installed on the testing platform, and an electromagnet is installed on the inner side of the positioning block. When the electromagnet is energized, it attracts and fixes the iron frame.

2. The optical inspection device for an LED panel according to claim 1, characterized in that, The projection of the pressure block and the insulating block on the horizontal plane forms a 180° angle.

3. The optical inspection device for an LED panel according to claim 2, characterized in that, During testing, there is a sloping gap between the root of the FPC of the backlight panel and the testing stage; the insulating block includes a block body and a guide portion protruding from one side of the front end of the block body. Before the corner cylinder screws the block body between the second gold finger and the testing electrode, the guide portion is first inserted into the gap to lift the FPC of the backlight panel, separating the second gold finger from the testing electrode.

4. The optical inspection device for an LED panel according to claim 3, characterized in that, The guide portion protrudes upward relative to the block body.

5. The optical inspection device for an LED panel according to claim 3, characterized in that, The guide portion has a wedge-shaped cross-section, and the top wall of the guide portion slopes downward on the side away from the block body.

6. The optical inspection device for an LED panel according to claim 3, characterized in that, The guide portion does not contact the second gold finger.

7. The optical inspection device for an LED panel according to claim 1, characterized in that, The outer frame of the backlight panel is also covered with an iron frame. The electromagnet in the positioning block can simultaneously attract the iron frames of the backlight panel and the LED panel, so that both the backlight panel and the LED panel are positioned by the positioning block.

8. The optical inspection apparatus for an LED panel according to any one of claims 1 to 7, characterized in that, The feeding mechanism includes a first lifting cylinder and a first suction cup group mounted on the first lifting cylinder. The first suction cup group includes multiple suction cups connected to a negative pressure generator. The first suction cup group can adsorb the LED panel.

9. The optical inspection device for an LED panel according to claim 8, characterized in that, The detection mechanism includes a rotary cylinder, a second lifting cylinder, a vision inspection component, and a second suction cup assembly. The rotary cylinder is mounted on the slider of the linear slide table. The second lifting cylinder is mounted on the piston rod of the rotary cylinder. The second suction cup assembly is mounted on the piston rod of the second lifting cylinder. The second suction cup assembly also includes multiple suction cups connected to a negative pressure generator. The second suction cup assembly can adsorb the LED panel. The vision inspection component is mounted on the second lifting cylinder and located on the side opposite to the second suction cup assembly. The vision inspection component can detect the brightness, chromaticity, and moiré patterns of the LED panel.

10. An optical inspection method for an LED panel, wherein the method uses the optical inspection device for the LED panel as described in claim 9, characterized in that, Includes the following steps: The feeding conveyor line intermittently transports LED panels to the feeding station; The linear slide moves the feeding mechanism to directly above the feeding station. The first suction cup group moves downward and adsorbs the LED panel before moving upward. The linear slide moves the feeding mechanism to above the inspection station. After the first suction cup group moves down and places the LED panel on the inspection table, the vacuum is broken. The linear slide moves the feeding mechanism above the feeding station again, and the inspection mechanism moves simultaneously above the inspection station with the vision inspection components of the inspection mechanism facing down. When the electromagnet is energized, the LED panel and backlight are attracted to the positioning block to accurately position the LED panel and backlight. The corner cylinder rotates the pressure block to the top of the first gold finger of the LED panel, and then presses the pressure block down to press the first and second gold fingers onto the detection electrode. After the backlight is powered on, it provides a light source for the LED panel, and the LED panel displays the image after being powered on. The vision inspection unit begins to inspect the optical performance of the LED panel; After the inspection is completed, the vision inspection component sends the inspection results to the host, and the rotary cylinder rotates 180° to make the second suction cup group face down; When the electromagnet is de-energized, the second suction cup group moves downward to attract the LED panel, and then moves upward to reset. The linear module repeats the feeding process, while the inspection mechanism moves to the unloading station. The second suction cup group places the LED panel on the unloading conveyor line, completing one inspection cycle. Repeat the above testing cycle to continuously test the LED panel.

Images