Micro LED display detection device and detection method

Abstract

A micro LED display detection device and detection method. The micro LED display detection device comprises a first object (2) which is provided with a first optical axis, and emits a test image; and a second object which is provided with a second optical axis, and receives and analyzes the test image to obtain optical parameters of the test image. High-precision automatic detection of important parameters of the first object (2) is realized, the problems of low efficiency and low test repeatability of manual detection are solved, and standardized measurement of the optical performance of a delivered AR light engine product is realized.

Description

Detection device and detection method for micro LED display

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on March 5, 2024, with application number 2024102510820 and invention name “Detection device and detection method for micro LED display”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present invention relates to the field of near-eye display technology, and in particular to a detection device and method for a micro LED display. Background Art

[0003] With the advancement of extended reality (XR) technology, the shipment volume of light engine modules used in XR-related products is increasing, and quality requirements are becoming increasingly standardized. Among the many hardware implementations of XR technologies (such as augmented reality (AR), virtual reality (VR), and mixed reality (MR)), light engine modules are used in near-to-eye display (NED) devices. These devices project images directly onto the NED. A specific lens array designed into the NED's optical system focuses the image onto the human retina. After processing by the visual nervous system, the image is presented to the user as a large-format virtual image, leading to widespread application.

[0004] Currently, the optical performance of light engine modules is primarily tested by quality inspectors using projection technology to determine if the modules meet quality standards. However, these methods suffer from low data accuracy, poor repeatability, and low efficiency, failing to meet market demand.

[0005] Summary of the Invention

[0006] The technical problem solved by the present invention is to provide a detection device and detection method for micro LED display, which can effectively improve the accuracy and repeatability of detection data such as the optical properties of a first object.

[0007] To address the aforementioned issues, the present invention provides a micro LED display detection device, comprising: a first object having a first optical axis, which emits a test image; and a second object having a second optical axis, which receives and analyzes the test image to obtain optical parameters of the test image.

[0008] Accordingly, the present invention also provides a method for detecting a micro LED display, comprising: providing a first object to be detected, the first object having a first optical axis; providing a second object, the second object having a second optical axis, the first optical axis being aligned with the second optical axis; lighting the first object to emit a test image; the second object acquiring an image of the test chart, receiving and analyzing the image of the test chart, and acquiring optical parameters of the image of the test chart.

[0009] Compared with the prior art, the technical solution of the present invention has the following advantages:

[0010] In the technical solution of the micro LED display detection device of the present invention, a second object obtains an image of a test chart of the first object and obtains the optical parameters of the test chart image, thereby realizing high-precision automated detection of important parameters of the first object, solving the problems of low efficiency and low test repeatability of manual detection, and enabling standardized measurement of the optical performance of shipped AR light engine products.

[0011] In the technical solution of the micro LED display inspection method of the present invention, a first object to be inspected is provided, the first object having a first optical axis; a second object is provided, the second object having a second optical axis, the first optical axis and the second optical axis being aligned; the first object is illuminated to emit a test image; the second object obtains the image of the test chart, receives and analyzes the image of the test chart, and obtains optical parameters of the image of the test chart; high-precision automated inspection of important parameters of the first object is achieved, solving the problems of low efficiency and low test repeatability of manual inspection, and enabling standardized measurement of the optical performance of shipped light engine products. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] FIG1 is a schematic structural diagram of a micro LED display detection device in an embodiment of the present invention in the X direction;

[0013] FIG2 is a schematic structural diagram of a detection device for a micro LED display in the Y direction according to an embodiment of the present invention;

[0014] FIG3 is a schematic structural diagram of a detection device for a micro LED display in the Z direction according to an embodiment of the present invention;

[0015] FIG4 is a schematic structural diagram of an alignment device according to an embodiment of the present invention;

[0016] FIG5 is a schematic diagram of an exploded structure of a fixing block and a fastening block in a clamping mechanism according to an embodiment of the present invention;

[0017] FIG6 is a schematic structural diagram of a fixing block and a fastening block in a clamping mechanism after installation in one embodiment of the present invention;

[0018] FIG7 is a schematic diagram of a second image captured by a first alignment device according to an embodiment of the present invention;

[0019] FIG8 is a schematic diagram of a second image obtained after the alignment of FIG7 is completed;

[0020] FIG9 is a schematic diagram of a third image captured by a second alignment device in one embodiment of the present invention;

[0021] FIG. 10 is a schematic diagram of a third image obtained after the alignment of FIG. 9 is completed.

[0022] FIG11 is a schematic diagram of a first image captured by a second object in one embodiment of the present invention;

[0023] FIG12 is a schematic diagram of a first image obtained after the alignment of FIG11 is completed; DETAILED DESCRIPTION

[0024] As mentioned in the background art, the optical performance detection technology of light engine modules in the prior art still needs to be improved.

[0025] On this basis, the present invention provides a detection device for micro LED display, which uses a second object to capture an image of a test chart of a first object, and uses a processor to analyze and calculate the image of the test chart to obtain optical parameters of the image of the test chart, thereby realizing high-precision automated detection of the optical parameters of the first object, improving detection efficiency, and combining the processor and the second object to capture and analyze the test chart, so that the detection process has high repeatability, and the optical performance of the shipped first object can be standardizedly measured, which has a wide range of applications.

[0026] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, specific embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0027] First, please refer to Figures 1 to 6, a micro LED display detection device includes: a first object 2 and a second object.

[0028] In this embodiment, the first object 2 is a light engine module.

[0029] In other embodiments, the first object 2 may also be a display panel, etc.

[0030] In this embodiment, the second object includes an optical imager 3 and a processor 8 . The optical imager 3 is electrically connected to the processor 8 , and the optical imager 3 has the second optical axis.

[0031] In other embodiments, the second object may also be an optical imager with a built-in image processing function.

[0032] In this embodiment, the detection device for micro LED display further includes: a device base 7 , on which the first object 2 and the optical imager 3 are fixed.

[0033] In this embodiment, the first object 2 has a first optical axis; the optical imager 3 is located in the optical path of the first object 2, and the optical imager 3 is used to obtain an image of the test chart of the first object 2. The optical imager 3 has a second optical axis, and the first optical axis is aligned with the second optical axis; the processor 8 is electrically connected to the optical imager 3, and is used to receive and analyze the image of the test chart and obtain optical parameters of the image of the test chart.

[0034] In this embodiment, the optical imager 3 is used to obtain an image of the test chart, and the processor 8 analyzes the image of the test chart to obtain optical parameters of the image of the test chart. The operator can determine the characteristics of the light emitted from the first object 2 based on the obtained optical parameters, thereby determining the luminous quality of the first object 2. This method of testing the characteristics of the light emitted by the first object 2 has the advantages of high data accuracy and good repeatability, and has a wide range of applications.

[0035] In this embodiment, the optical parameters include one or more of brightness and chromaticity values, brightness uniformity, field of view, distortion, contrast, and modulation contrast.

[0036] Specifically, test charts include all-white charts, ANSI contrast test charts, black and white line pair charts, and the like.

[0037] When the test chart is a completely white chart, the processor 8 analyzes the image of the completely white chart and calculates one or more of the brightness and chromaticity values, brightness uniformity, field of view, and distortion of the image of the first object 2 .

[0038] When the test chart is an ANSI contrast test chart, the processor 8 analyzes the image of the ANSI contrast test chart and calculates the contrast of the image of the first object 2 .

[0039] When the test chart is a black-and-white line-pair chart, the processor 8 analyzes the image of the black-and-white line-pair chart and calculates the modulation contrast of the image of the first object 2 .

[0040] In this embodiment, the optical imager 3 includes a near-eye display lens 31 and an image sensor 32. One end of the image sensor 32 is fixed to the optical fine-tuning platform 51 of the second positioning mechanism, and the near-eye display lens 31 is fixed to the other end of the image sensor 32. The near-eye display lens is located near the first positioning mechanism 1. During the inspection process, when the optical imager 3 and the first object 2 are positioned, the first object 2 emits parallel light toward the optical imager 3. The image sensor 32 converts the acquired image of the first object 2 into an electrical signal and transmits it to the processor 8. The processor 8 is configured to receive and calculate the image of the test chart to obtain the optical parameters of the test chart image.

[0041] In this embodiment, the near-eye display lens 31 is a telecentric lens with autofocus. A telecentric lens ensures that the image magnification remains constant within a certain range of object distances. Specifically, when the optical imager 3 captures the first object 2, even if the distance between the first object 2 and the optical imager 3 changes, the image of the first object 2 captured by the optical imager 3 exhibits minimal distortion, allowing the edges of the first object 2 to be clearly captured.

[0042] In other embodiments, the near-eye display lens 31 adopts mechanical autofocus. The near-eye display lens 31 includes a lens body (not shown), a lens motor (not shown), a focus ring (not shown) and a lens encoder (not shown). The focus ring adopts a gear-engaging focus ring. The lens motor is fixed to the lens body, and the focus ring is rotatably mounted on the lens body and fixed to the output end of the lens motor. The lens encoder is fixed to the lens body and electrically connected to the lens motor. In the process of the optical imager 3 acquiring the image of the test chart of the first object 2, the encoder obtains the virtual phase distance of the first object 2, drives the lens motor to drive the focus ring to rotate, and achieves focusing, so that the optical imager 3 obtains a clear image of the test chart.

[0043] In this embodiment, the image sensor 32 is a CCD camera or a CMOS camera.

[0044] In this embodiment, please continue to refer to Figures 1 to 3. The detection device for micro LED display also includes a positioning mechanism fixed to the base of the device, and the positioning mechanism is used to fix the first object 2 and the optical imager 3, and adjust the position of the first object 2 and / or adjust the position of the optical imager 3 so that the first optical axis of the first object 2 is aligned with the second optical axis of the optical imager 3.

[0045] In this embodiment, the positioning mechanism includes a first positioning mechanism 1 and a second positioning mechanism 5. The first positioning mechanism 1 is fixed to the device base 7, and the first positioning mechanism 1 is used to fix and adjust the position of the first object 2. The second positioning mechanism 5 is fixed to the device base 7, and the second positioning mechanism 5 is used to fix and adjust the position of the optical imager 3.

[0046] In this embodiment, the positioning mechanism adjusts the position of the first object 2 and / or the position of the optical imager 3 to reduce the slight angle or displacement deviation in the geometric alignment of the first object 2 and the optical imager 3, thereby improving the precision and accuracy of the detection data.

[0047] In this embodiment, the first positioning mechanism 1 includes a six-dimensional adjustment mechanism 11, which has a clamping arm facing the optical imager 3, and the first object 2 is fixed to the clamping arm. The six-dimensional adjustment mechanism 11 can drive the first object 2 to move or rotate in space to adjust the relative position of the optical imager 3 and the first object 2, so that the first optical axis of the first object 2 is aligned with the second optical axis of the optical imager 3.

[0048] Specifically, the six-dimensional adjustment mechanism 11 is a six-axis manipulator. The six-axis manipulator is electrically connected to the processor 8. The processor 8 includes six-axis manipulator control software. By entering the six-axis manipulator's rotation angle or displacement in the six-axis manipulator control software, the six-axis manipulator can adjust the rotation angle or displacement of the first object 2 fixed to the six-axis manipulator in space, thereby aligning the first object 2 and the optical imager 3, thereby aligning the first optical axis with the second optical axis, ensuring the accuracy of the detection data and achieving detection repeatability.

[0049] In this embodiment, the first positioning mechanism 1 further includes a clamping mechanism 12 . The clamping mechanism 12 is fixed to the clamping arm, and the first object 2 is fixed to the clamping mechanism 12 .

[0050] Please continue to refer to Figures 5 and 6. The clamping mechanism 12 includes a fixed block 121 and a fastening block 122. The fixed block 121 has a mounting end 1211 and a movable end 1212. The mounting end 1211 is fixed to the clamping arm, and the movable end 1212 is close to the second object. The side of the movable end 1212 close to the optical imager 3 has a mounting groove 1213, and the light-emitting end 21 of the first object 2 is installed in the mounting groove 1213; the clamping mechanism also includes a fastening block 122, which is detachably connected to the movable end 1212, and the fastening block 122 has a fastening opening 1222 corresponding to the light-emitting end of the engine module 2.

[0051] Specifically, during the process of aligning the first optical axis with the second optical axis, the operator can install the light-emitting end 21 of the first object 2 in the installation groove 1213, and make the light-emitting end 21 of the first object 2 face the fastening block 122. The connector of the first object 2 is located on the outside of the installation groove 1213, suitable for connecting to an external circuit; the operator makes the fastening opening 1222 of the fastening block 122 correspond to the light-emitting end 21 of the first object 2, and fixes it to the movable end 1212 of the fixed block 121. The light emitted by the first object 2 after it is powered on and lit is projected onto the optical imager 3.

[0052] In other embodiments, the clamping mechanism includes a fixed block having a movable end, the movable end having a mounting cavity, the side wall of the fixed block close to the second object having a light outlet, the light outlet being connected to the mounting cavity, the light outlet end of the first object being located in the mounting cavity, and the light emitted by the first object after being powered on is emitted to the second object through the light outlet.

[0053] In other embodiments, the side of the movable end also has a mounting opening, which is connected to the mounting cavity. The light-emitting end of the first object is completely located in the mounting cavity. The light-emitting end of the first object is installed in the mounting cavity through the mounting opening. The light-emitting end of the first object faces the light outlet. The connector of the first object is located outside the mounting cavity and is suitable for connecting to an external circuit.

[0054] In other embodiments, the side of the movable end further has an electrical connection port, which is arranged opposite to the mounting opening. The connector of the first object is located outside the mounting cavity through the electrical connection port and is suitable for connecting to an external circuit.

[0055] In other embodiments, the clamping mechanism further includes a fastening block, which is detachably connected to the movable end and has a fastening opening corresponding to the light emitting end.

[0056] Specifically, in the process of aligning the first optical axis with the second optical axis, the operator can install the light-emitting end of the first object in the mounting cavity through the mounting opening, and make the light-emitting end of the first object face the light-emitting port, and the connector of the first object is located on the outside of the mounting cavity through the electrical connection opening, suitable for connecting to an external circuit; the operator makes the fastening opening of the fastening block correspond to the light-emitting port, and fixes it to the movable end of the fixing block, with the light-emitting end of the first object facing the fastening opening, and the light emitted after the first object is powered on and lit is projected onto the second object.

[0057] In this embodiment, the fastening block 122 is used to quickly fix the first object 2 , thereby reducing the difficulty of fixing the first object 2 .

[0058] In this embodiment, please continue to refer to Figures 1 to 3. The second positioning mechanism 5 includes a second positioning mechanism bracket 52 and a second positioning mechanism optical fine-tuning platform 51 detachably connected to the second positioning mechanism bracket 52. The optical imager 3 is fixed to one end of the second positioning mechanism optical fine-tuning platform 51 close to the first positioning mechanism 1. The second positioning mechanism optical fine-tuning platform 51 can adjust the position of the optical imager 3 so that the first object 2 and the optical imager 3 are aligned, thereby aligning the first optical axis with the second optical axis, thereby improving the precision and accuracy of the detection data.

[0059] Specifically, the second positioning mechanism bracket 52 is fixed to the device base 7, and the second positioning mechanism optical fine-tuning platform 51 is detachably connected to the second positioning mechanism bracket 52. By adjusting the second positioning mechanism optical fine-tuning platform 51 to move or rotate in space, the second positioning mechanism optical fine-tuning platform 51 drives the optical imager 3 to move or rotate in space, aligning the first optical axis with the second optical axis, thereby improving the precision and accuracy of the detection data.

[0060] In this embodiment, the second positioning mechanism optical fine-tuning platform 51 is an XYZ three-axis fine-tuning platform.

[0061] Specifically, the second positioning mechanism optical fine-tuning platform 51 includes an XY-axis platform and a Z-axis platform. The optical imager 3 is fixed to the XY-axis platform. The XY-axis platform is used to drive the optical imager 3 in the X-axis and Y-axis directions. The Z-axis platform has a fixed platform end and a movable platform end. The fixed platform end is fixed to the second positioning mechanism bracket 52, and the movable platform end is fixed to the XY-axis platform. It is used to drive the XY-axis platform in the Z-axis direction, and the XY-axis platform drives the optical imager 3 in the Z-axis direction.

[0062] In other embodiments, the second positioning mechanism optical fine-tuning platform 51 includes a YZ-axis platform and an X-axis platform. The optical imager 3 is fixed to the YZ-axis platform. The YZ-axis platform is used to drive the optical imager 3 in the Y-axis and Z-axis directions. The X-axis platform has a fixed platform end and a movable platform end. The fixed platform end is fixed to the second positioning mechanism bracket, and the movable platform end is fixed to the YZ-axis platform. It is used to drive the YZ-axis platform in the X-axis direction, and the YZ-axis platform drives the optical imager 3 in the X-axis direction. Alternatively, the second positioning mechanism optical fine-tuning platform 51 includes an XZ-axis platform and a Y-axis platform.

[0063] 1 to 4 , the micro LED display detection device further includes a registration projection system electrically connected to the second object, specifically a registration projection system 4 electrically connected to the processor 8 .

[0064] In this embodiment, the first object 2 and the optical imager 3 are located on the optical path of the alignment projection system 4, and the optical path of the alignment projection system 4 is perpendicular to the optical path of the first object 2. The alignment projection system 4 obtains a position image of the relative position of the first object 2 and the optical imager 3. The processor 8 receives and analyzes the position image, obtains the relative position information of the first object 2 and the optical imager 3, and adjusts the second object and / or the first object according to the relative position information so that the first optical axis of the first object is aligned with the second optical axis of the second object.

[0065] In this embodiment, the optical path of the first object 2 is set as the first direction, and the first direction is set as the Z-axis direction.

[0066] The alignment projection system 4 includes at least one pair of alignment devices, each comprising a transmitter and a receiver corresponding to the transmitter. The transmitter emits light, and the receiver captures a position image of the relative position of the first object 2 and the optical imager 3. The processor 8 receives and analyzes the position image to obtain relative position information of the first object 2 and the optical imager 3. Based on this relative position information, the processor adjusts the relative position of the first object 2 and the optical imager 3 via a positioning mechanism, aligning the first optical axis and the second optical axis of the first object 2 and the optical imager 3, thereby improving the accuracy and repeatability of the detection data.

[0067] Specifically, the transmitter emits light, the receiver obtains an image containing the optical engine module 2 and the optical imager 3, and sends it to the processor 8; the processor 8 analyzes the image containing the first object 2 and the optical imager 3, and calculates the spatial positions of the optical engine module 2 and the optical imager 3 in the image; the operator determines whether the spatial positions of the optical engine module 2 and the optical imager 3 meet the requirements.

[0068] If the spatial positioning of the optical engine module 2 and the optical imager 3 meets the requirements, the test chart of the first object 2 is illuminated, and the optical imager 3 captures the image of the test chart and sends it to the processor 8. The processor 8 analyzes the received image of the test chart and calculates the optical parameters of the test chart image. Based on the optical parameters, the operator can determine the optical characteristics of the light emitted by the first object 2 and, therefore, the quality of the light emitted by the first object 2.

[0069] If the spatial position of the optical engine module 2 and the optical imager 3 does not meet the requirements, the position of the first object 2 and / or the position of the optical imager 3 are adjusted so that the spatial position of the optical engine module 2 and the optical imager 3 meet the requirements.

[0070] In this embodiment, the light emitted by the emitter is parallel light, the light emitted by the first object 2 is also parallel light, and the receiver is a CCD camera or a CMOS camera.

[0071] In this embodiment, please continue to refer to Figure 1, the micro LED display detection device also includes a projection bracket 6, and the projection bracket 6 is fixed to the device base 7.

[0072] In this embodiment, referring to Figure 4 , the first object 2 and the optical imager 3 form the third alignment device 23. The aligned projection system 4 includes a first alignment device 41 and a second alignment device 42. The first alignment device 41, the second alignment device 42, and the third alignment device 23 are positioned perpendicular to each other. The first alignment device 41 and the second alignment device 42 are each secured to a projection bracket 6. The first object 2 and the optical imager 3 are both located in the optical path of the first alignment device 41 and the second alignment device 42.

[0073] In this embodiment, the first alignment device 41 is located in the second direction, and the second alignment device 42 is located in the third direction. The first direction is perpendicular to the second direction, the second direction is perpendicular to the third direction, and the third direction is perpendicular to the first direction.

[0074] Specifically, the second direction of the first alignment device 41 is the X-axis direction, the third direction of the second alignment device 42 is the Y-axis direction, and the orientation of the third alignment device 23 is the Z-axis (i.e., the first direction on the optical path of the first object 2), and the first alignment device 41 and the second alignment device 42 are on the XOY plane.

[0075] Furthermore, the first alignment device 41 includes a first transmitter 411 and a first receiver 412 . The second alignment device 42 includes a second transmitter 421 and a second receiver 422 .

[0076] Referring to Figure 4 , with the Z-axis, where the first object 2 and the optical imager 3 are located, as a reference, the first transmitter 411 is positioned to the left of the Z-axis, and the first receiver 412 is positioned to the right of the Z-axis. The second transmitter 421 is positioned above the Z-axis, and the first receiver 422 is positioned below the Z-axis.

[0077] 1 , the micro LED display detection device further includes an air-floating vibration isolation mechanism 9 . The air-floating vibration isolation mechanism 9 is fixed to a side of the device base 7 away from the first positioning mechanism 1 .

[0078] Furthermore, the air-floating vibration isolation mechanism 9 includes an air-floating vibration isolator 91 and a supporting platform 92 .

[0079] The air-floating vibration isolator 91 is fixed to the side of the equipment base 7 close to the support platform 92. The first positioning mechanism 1, the imaging positioning structure 5 and the projection bracket 6 are fixed to the air-floating vibration isolator 9. During the detection process, the air-floating vibration isolator 91 can play a role in preventing shaking.

[0080] In this embodiment, the test chart of the first object 2 is imaged by the optical imager 3, and the image of the test chart is analyzed and calculated by the processor 8 to obtain the optical parameters of the image of the test chart, thereby realizing high-precision automated detection of the optical parameters of the first object 2, solving the problems of low efficiency of manual detection and low test repeatability, and enabling the optical performance of the shipped first object to be measured in a standardized manner.

[0081] Correspondingly, using the above-mentioned micro LED display detection device, the present invention also provides a micro LED display detection method including: providing a first object to be detected, the first object having a first optical axis; providing a second object, the second object having a second optical axis, the first optical axis and the second optical axis being aligned; lighting the first object to emit a test image; the second object acquiring an image of the test chart, receiving and analyzing the image of the test chart, and acquiring optical parameters of the image of the test chart.

[0082] In this embodiment, after the second object calculates the optical parameters of the test chart, it stores the optical parameters so that the optical parameters can be retrieved when needed.

[0083] In this embodiment, the acquired test chart includes one or more of a full white chart, a contrast test chart, and a black and white line pair chart.

[0084] In this embodiment, the acquired optical parameters include one or more of brightness and chromaticity values, brightness uniformity, field of view, distortion, contrast, and modulation contrast.

[0085] Specifically, when the test chart is a completely white chart, the second object analyzes the image of the completely white chart and calculates one or more of the brightness and chromaticity values, brightness uniformity, field of view, and distortion of the image of the first object 2 .

[0086] In some embodiments, the second object analyzes the image of the all-white card and can directly calculate the brightness and color value of the all-white card image. The brightness and color value is the brightness and color value of the light emitted by the first object 2.

[0087] In some embodiments, the second object analyzes an image of a completely white card, divides the image into blocks, calculates brightness and chromaticity values ​​of corresponding blocks, calculates average brightness and chromaticity values ​​based on the brightness and chromaticity values ​​of each block, and calculates brightness uniformity.

[0088] Specifically, the second object analyzes and calculates the maximum brightness value L of the image block of the all-white image card Max And the average value of brightness and chromaticity of each block L Mean , calculate the brightness uniformity of the image of the all-white card as

[0089] In some embodiments, the second object analyzes the image of the all-white chart and determines the maximum number of pixels in the image in the vertical and horizontal directions. The operator calculates the vertical and horizontal field of view angles based on the maximum number of pixels in the vertical and horizontal directions and the angular resolution of the second object (specifically, the optical imager 3 ) used to capture the image.

[0090] In some embodiments, the second object analyzes the image of the all-white card, analyzes the minimum circumscribed rectangle and the maximum inscribed rectangle corresponding to the image, calculates the difference ΔH between the side lengths of the minimum circumscribed rectangle and the maximum inscribed rectangle, and calculates the 50% ratio of ΔH to the side length H of the corresponding minimum circumscribed rectangle, thereby calculating the distortion of the image of the all-white card, that is, the distortion of the image of the all-white card is

[0091] When the acquired test chart is an ANSI contrast test chart, the second object analyzes the image of the ANSI contrast test chart and calculates the contrast of the image of the first object 2 .

[0092] Specifically, the second object analyzes the image of the ANSI contrast test chart, analyzes the white blocks and black blocks in the image, calculates the grayscale mean of the white blocks and the grayscale mean of the black blocks, and calculates the ratio of the grayscale mean of the white blocks to the grayscale mean of the black blocks, thereby obtaining the contrast of the light emitted by the first object 2.

[0093] When the acquired test chart is a black and white line pair chart, the second object analyzes the image of the black and white line pair chart and calculates the modulation contrast of the image of the first object 2 .

[0094] Specifically, the second object analyzes the image of the black and white line pair chart and calculates the maximum brightness value L of the image. Max and the minimum brightness value L Min , and thus calculate the modulation contrast. The modulation contrast is

[0095] Before acquiring the test image of the first object, the first object and the second object are aligned so that the optical axis of the first object is aligned with the optical axis of the second object. For specific operations, please refer to Figures 7 to 12.

[0096] First, please refer to Figure 7. A first alignment device 41 located on one side of the first object and the second object is used to emit a first light beam. The side of the first alignment device 41 that emits the first light beam is opposite to the first object and the second object to obtain a second image of the relative positional relationship between the first object and the second object.

[0097] Specifically, the second image includes the first side contour line A1 and the second side contour line A2 of the optical imager 3, the third side contour line B1 and the fourth side contour line B2 of the light output end 21 of the first object 2, the first side contour line A1 and the second side contour line A2 are respectively located on both sides of the first direction (Z axis), and the third side contour line B1 and the fourth side contour line B2 are respectively located on both sides of the first direction (Z axis).

[0098] In this embodiment, the first side contour line A1 , the second side contour line A2 , the third side contour line B1 and the fourth side contour line B2 are straight lines, which are the contour lines of their own contour lines.

[0099] In other embodiments, when the first side contour line, the second side contour line, the third side contour line, and the fourth side contour line are curves, the contour line is a tangent line corresponding to the contour line curve.

[0100] In this embodiment, the second front end contour line is a curve, and the tangent line of the curve is taken as the second front end contour line B4.

[0101] In this embodiment, the second object receives and analyzes the second image. Specifically, the processor 8 receives and analyzes the second image, and the method for obtaining the position information of the second image includes: identifying the first side contour line A1 and the second side contour line A2, and obtaining the second symmetry line A3 of the first side contour line A1 and the second side contour line A2 in the first direction (Z-axis direction); identifying the third side contour line B1 and the fourth side contour line B2, and obtaining the third symmetry line B3 of the third side contour line B1 and the fourth side contour line B2 in the first direction (Z-axis direction); a second angle is formed between the second symmetry line A3 and the third symmetry line B3, and the vertical distance from the center of one end of the first object 4 close to the second object 11 to the second symmetry line A3 is a first distance. The position information of the second image includes the first distance and the second angle.

[0102] According to the threshold of the position information of the second image, the specific method for determining whether the position information of the second image meets the threshold of the position information of the second image is: according to the threshold of the first distance and the threshold of the second angle, determining whether the first distance of the second image meets the threshold of the first distance, and determining whether the second angle meets the threshold of the second angle.

[0103] Specifically, it is determined that the second angle is less than or equal to the second angle threshold and the first distance is less than or equal to the first distance threshold, and the second position information of the second image meets the threshold of the position information, and the first alignment device 41 is completed to capture the relative position between the optical imager 3 and the first object 2 in the second direction (please refer to Figure 8), that is, the alignment of the second object and the first object 2 in the second direction (X-axis) is completed.

[0104] When it is determined that the position information of the second image does not meet the threshold of the position information of the second image, that is, when it is determined that the second angle is greater than the threshold of the second angle and / or the first distance is less than or equal to the threshold of the first distance, before acquiring the second image, the relative position of the optical imager 3 and the first object 2 is adjusted according to the position information of the second image. Specifically, according to the first distance, one or both of the optical imager 3 and the first object 2 are adjusted to move along the third direction; or according to the second angle, one or both of the optical imager 3 and the first object 2 are rotated around the second direction.

[0105] In this embodiment, after the relative position of the optical imager 3 and the first object 2 is adjusted, the second image is obtained to obtain the position information of the second image; the position information of the second image is compared with the threshold of the position information of the second image, and the alignment of the first object 2 and the second object in the second direction is completed after the position information of the second image meets the threshold.

[0106] In this embodiment, a second alignment device 42 electrically connected to the second object is used to emit a second light beam; it is located above the first object and the second object, and the side of the second alignment device that emits the second light beam is opposite to the first object and the second object; wherein, the first light beam is not parallel to the second light beam, and a third image of the relative positional relationship between the first object and the second object is obtained.

[0107] Please refer to Figure 9. The third image includes the fifth side contour line A11 and the sixth side contour line A12 of the optical imager 3, and the seventh side contour line B11 and the eighth side contour line B12 of the light-emitting end of the first object 2. The fifth side contour line A11 and the sixth side contour line A12 are respectively located on both sides of the first direction, and the seventh side contour line B11 and the eighth side contour line B12 are respectively located on both sides of the first direction (Z axis).

[0108] In this embodiment, the fifth side contour line A11 , the sixth side contour line A12 , the seventh side contour line B11 and the eighth side contour line B12 are straight lines, which are the contour lines of their own contour lines.

[0109] In other embodiments, when the fifth side contour line A11, the sixth side contour line A12, the seventh side contour line B11 and the eighth side contour line B12 are curves, the contour line is the tangent line corresponding to the contour curve.

[0110] In this embodiment, the second object receives and analyzes the third image. Specifically, the processor 8 receives and analyzes the third image, and the method for obtaining the position information of the third image includes: the processor 8 identifies the fifth side contour line A11 and the sixth side contour line A12, and obtains the fourth symmetry line A13 of the fifth side contour line A11 and the sixth side contour line A12 in the second direction (X-axis direction); the processor identifies the seventh side contour line B11 and the eighth side contour line B12, and obtains the fifth symmetry line B13 of the seventh side contour line B11 and the eighth side contour line B12 in the second direction (X-axis direction); a third angle is formed between the fourth symmetry line A13 and the fifth symmetry line B13, and the vertical distance from the center of one end of the first object 2 close to the optical imager 3 to the fourth symmetry line A13 is the second distance. The position information of the third image includes the third angle and the second distance.

[0111] In this embodiment, based on the threshold of the position information of the third image, it is determined whether the position information of the third image meets the threshold of the position information of the third image. When it is determined that the third angle is less than the threshold of the third angle and the second distance is less than the threshold of the second distance, the position information of the third image meets the threshold of the position information of the third image, and the second alignment device 42 is completed to capture the relative position between the optical imager 3 and the first object 2 in the third direction (please refer to Figure 10), that is, the alignment of the second object and the first object 2 in the third direction is completed.

[0112] When it is determined that the position information of the third image does not meet the threshold of the position information of the third image, that is, it is determined that the third angle is greater than the threshold of the third angle and / or the second distance is greater than the threshold of the second distance, the position of the optical imager 3 and / or the position of the first object 2 is adjusted according to the position information of the third graphic. Specifically, according to the second distance, one or both of the first object 2 and the optical imager 3 are adjusted to move along the second direction; or according to the third angle, one or both of the first object 2 and the optical imager 3 are rotated around the third direction.

[0113] In this embodiment, when the position information of the third image does not meet the threshold of the third position information, the relative position relationship between the first object 2 and the optical imager 3 is adjusted according to the position information of the third image, and then the third image is obtained, and then the position information of the third image is obtained based on the third image, until the position information of the third image meets the threshold of the position information of the third image, the alignment of the first object 2 and the optical imager 3 in the third direction is completed.

[0114] In this embodiment, the optical imager 3 is further used to capture an image of the first object 2 to obtain a first image.

[0115] In this embodiment, referring to FIG. 11 , the first image includes: the first image includes a first contour line C1 of the first object 2 close to the optical imager 3 and a first symmetry line C2 of the first image in the second direction (X-axis direction).

[0116] In this embodiment, the first contour line C1 is a straight line, and the first contour line C1 of the first object 2 itself is taken as the first contour line C1 .

[0117] In other embodiments, when the first contour line of the first object 2 approaching the optical imager 3 is an arc, the tangent line of the arc is taken as the first contour line C1 .

[0118] In this embodiment, after acquiring the first image, it also includes: the processor receives the first image and identifies the first contour line of the first object 2 close to the optical imager 3 in the first image and the first symmetry line of the first image in the second direction; and acquires the angle between the first contour line and the first symmetry line as the first angle, and the second direction is perpendicular to the orientation of the first object 2 and the optical imager 3.

[0119] The method for obtaining the first angle includes: a processor calculating the angle between the first contour line C1 and the first symmetry line C2, that is, the first angle.

[0120] In this embodiment, the first angle is an acute angle between the first contour line C1 and the first symmetry line C2.

[0121] After obtaining the first angle, in this embodiment, the processor receives and analyzes the second image and further includes: identifying the first front end contour line of the optical imager 3 approaching the first object 2 in the third direction, and the second front end contour line of the first object 2 approaching the optical imager 3 in the third direction; obtaining a third distance, the third distance being the vertical distance from the center of symmetry of the second front end contour line to the first front end contour line, the third direction being perpendicular to the orientation of the first object 2 and the optical imager 3, and obtaining position information of the first image, the position information of the first image including the first angle and the third distance.

[0122] Specifically, the method for obtaining the third distance includes: referring to Figure 7, identifying the first front end contour line A4 of the optical imager 3 approaching the first object 2 in the third direction, and the second front end contour line B4 of the first object 2 approaching the optical imager 3 in the third direction; and obtaining the vertical distance from the symmetry center of the second front end contour line B4 to the first front end contour line A4 as the third distance.

[0123] The operator compares the first angle with the threshold of the first angle, and the third distance with the threshold of the third distance. When the first angle is less than or equal to the threshold of the first angle and the third distance is less than or equal to the threshold of the third distance, the first position information meets the first threshold. At this time, there is no need to move the optical imager 3 or the first object 2 in the first direction (Z-axis direction). The optical imager 3 completes the imaging of the first object 2 (please refer to Figure 12), that is, the alignment of the second object and the first object 2 in the first direction (Z-axis direction) is completed.

[0124] In other embodiments, the image processing software of the processor identifies the first contour line C1 and the first symmetry line C2, and calculates the first angle between the first contour line C1 and the first symmetry line C2, identifies the third front end contour line of the optical imager 3 close to the first object 2 in the first direction, and the fourth front end contour line of the first object 2 close to the optical imager 3 in the first direction; and obtains the vertical distance from the center of symmetry of the fourth front end contour line to the third front end contour line as the fourth distance.

[0125] The operator compares the first angle with the threshold of the first angle, and the fourth distance with the threshold of the fourth distance. When the first angle is less than or equal to the threshold of the first angle and the fourth distance is less than or equal to the threshold of the fourth distance, the first position information meets the first threshold. At this time, there is no need to move the optical imager 3 or the first object 2 in the first direction (Z-axis direction). The optical imager 3 completes the imaging of the first object 2 (please refer to Figure 12), that is, the alignment of the second object and the first object 2 in the first direction (Z-axis direction) is completed.

[0126] In this embodiment, the first position information does not meet the first threshold, that is, when the first angle is greater than the threshold of the first angle and / or the third distance is greater than the threshold of the third distance, before acquiring the first image, the optical imager 3 is rotated around the first direction or the first object 2 is rotated around the first direction.

[0127] Specifically, the six-axis manipulator is driven to rotate the first object 2 around the Z axis to adjust the relative position of the first object 2 and the optical imager 3 .

[0128] In other embodiments, the optical fine-tuning platform is driven to rotate the optical imager 3 about the Z axis to adjust the relative position of the first object 2 and the optical imager 3. Alternatively, the six-axis manipulator is driven to rotate the first object 2 about the Z axis, and the optical fine-tuning platform is simultaneously driven to rotate the optical imager 3 about the Z axis to adjust the relative position of the first object 2 and the optical imager 3.

[0129] In this embodiment, after the first object 2 is driven to rotate around the Z axis, a first image is acquired, and first position information is acquired according to the first image until the first position information meets a first threshold.

[0130] 8 and 10 , when the third distance does not satisfy the third distance threshold or the fourth distance does not satisfy the fourth distance threshold, the relative positions of the first object 2 and the optical imager 3 are adjusted along the first direction.

[0131] In this embodiment, precise alignment of the first object is achieved in multiple directions (XYZ directions) by aligning the projection system 4 and the second object itself, thereby reducing image distortion of the first object. At the same time, the test chart of the first object 2 is imaged by the second object, and the image of the test chart is analyzed and calculated to obtain optical parameters of the image of the test chart, thereby achieving high-precision automated detection of the optical parameters of the first object 2, solving the problems of low efficiency of manual detection and low test repeatability, and enabling standardized measurement of the optical performance of the shipped first object.

[0132] In one application, the first object mentioned above includes a micro display panel.

[0133] The micro display panel described above has a very small volume, with length and width dimensions ranging from 500μm to 50,000μm. The area of ​​the light-emitting region of the micro display panel is very small, such as 1mm×1mm, 2.64mm×2.02mm, 3mm×5mm, etc. The light-emitting region of the micro display panel includes a plurality of micro LED pixels arranged in an array, and the specific pixel arrangement can be one of 320×240, 640×480, 1600×1200, 1920×1080, and 2560×1440. The size of a single micro LED pixel is between 100nm and 100 microns. In some embodiments, the size of a single micro LED pixel is between 150nm and 15 microns. In some embodiments, the size of a single micro LED pixel can also be less than 10 microns.

[0134] A driver backplane is located behind the micro-LED pixel array. It is electrically connected to the micro-LEDs within the array and receives signals such as image data from the outside world, controlling the corresponding micro-LEDs to illuminate or not illuminate. The driver backplane is typically a TFT (Thin Film Transistor) board or an IC (Integrated Circuit) board.

[0135] For example, the driving backplane of the above-mentioned micro display panel integrates a frame buffer, a column driving circuit, and a row driving circuit. The frame buffer includes a first pixel storage area, and the micro LED pixel array includes a second pixel storage area. A complete frame of pixel grayscale data from the outside world can first enter the first pixel storage area of ​​the frame buffer, and the column driving circuit can load the pixel grayscale data in the first pixel storage area of ​​the frame buffer into the second pixel storage area of ​​the micro LED pixel array. The row driving circuit can scan the pixel grayscale data in the second pixel storage area and generate a pulse modulation signal to achieve the purpose of displaying different grayscales. When driving multiple micro LED pixels in the micro LED pixel array, it is possible to adopt a single pixel independent driving method or a multiple pixel unit independent driving method. The specific driving method should not constitute a limitation to this application.

[0136] It should be noted that the application of the above-mentioned micro display panel in the first object of the present invention should not constitute a limitation on the application of the present invention.

[0137] Although the present invention is disclosed above, the present invention is not limited thereto. Any person skilled in the art can make various changes and modifications without departing from the spirit and scope of the present invention. Therefore, the scope of protection of the present invention should be based on the scope defined by the claims.

Claims

1. A detection device for micro LED display, characterized in that: include: a first object having a first optical axis, wherein the first object emits a test image; The second object has a second optical axis, and the second object receives and analyzes the test image to obtain optical parameters of the test image.

2. The micro LED display detection device according to claim 1, wherein: The first object includes a light engine module and a display panel.

3. The micro LED display detection device according to claim 1, wherein: The second object includes an optical imager and a processor, the optical imager is electrically connected to the processor, and the optical imager has the second optical axis; or the second object is an optical imager with a built-in image processing function.

4. The micro LED display detection device according to claim 1, wherein: It also includes a positioning mechanism, which is used to fix the first object and the second object, and adjust the position of the first object and / or adjust the position of the second object to align the first optical axis with the second optical axis.

5. The micro LED display detection device according to claim 4, wherein: The positioning mechanism includes a first positioning mechanism, and the first positioning mechanism is used to fix and adjust the position of the first object.

6. The micro LED display detection device according to claim 5, wherein: The first positioning mechanism includes a six-dimensional adjustment mechanism, which has a clamping arm facing the second object. The first object is fixed to the clamping arm. The six-dimensional adjustment mechanism can drive the first object to move or rotate in space so that the first optical axis is aligned with the second optical axis.

7. The micro LED display detection device according to claim 5, wherein: The first positioning mechanism further includes a clamping mechanism, the clamping mechanism is fixed to the clamping arm, and the first object is fixed to the clamping mechanism.

8. The micro LED display detection device according to claim 7, wherein: The clamping mechanism includes a fixed block, which has a movable end, and the movable end has a mounting cavity. The side wall of the fixed block close to the second object has a light outlet, and the light outlet is connected to the mounting cavity. The light outlet end of the first object is located in the mounting cavity, and the light emitted by the first object after power is turned on is emitted to the second object through the light outlet.

9. The micro LED display detection device according to claim 8, wherein: The side of the movable end also has a mounting opening, which is connected to the mounting cavity. The light-emitting end of the first object is completely located in the mounting cavity. The light-emitting end of the first object is installed in the mounting cavity through the mounting opening. The light-emitting end of the first object faces the light outlet. The connector of the first object is located outside the mounting cavity and is suitable for connecting to an external circuit.

10. The micro LED display detection device according to claim 8, wherein: The side of the movable end also has an electrical connection port, which is arranged opposite to the installation opening. The connector of the first object is located outside the installation cavity through the electrical connection opening and is suitable for connecting to an external circuit.

11. The micro LED display detection device according to claim 7, wherein: The clamping mechanism includes a fixed block, which has a mounting end and a movable end, the mounting end is fixed to the clamping arm, the movable end is close to the second object, and the side of the movable end close to the second object has a mounting groove, and the light-emitting end of the first object is installed in the mounting groove; the clamping mechanism also includes a fastening block, which is detachably connected to the movable end, and the fastening block has a fastening opening corresponding to the light-emitting end.

12. The micro LED display detection device according to claim 5, wherein: The positioning mechanism further includes a second positioning mechanism for fixing and adjusting the position of the second object so that the first optical axis is aligned with the second optical axis.

13. The micro LED display detection device according to claim 12, wherein: The second positioning mechanism includes a second positioning mechanism bracket and a second positioning mechanism optical fine-tuning platform detachably connected to the second positioning mechanism bracket. The second object is fixed to one end of the second positioning mechanism optical fine-tuning platform close to the first positioning mechanism. The second positioning mechanism optical fine-tuning platform can adjust the position of the second object so that the first optical axis of the first object is aligned with the second optical axis of the second object.

14. The micro LED display detection device according to claim 1, wherein: Also includes: A registration projection system electrically connected to the second object, wherein the first object and the second object are located in an optical path of the registration projection system, and the optical path of the registration projection system is perpendicular to the optical path of the first object. The registration projection system is used to obtain a position image of the relative positions of the first object and the second object, and the second object is used to receive and analyze the position image to obtain relative position information of the first object and the second object, so as to adjust the second object and / or the first object according to the relative position information so that the first optical axis of the first object is aligned with the second optical axis of the second object.

15. The micro LED display detection device according to claim 1, wherein: Also included is a device base for fixing the first object and the second object.

16. The micro LED display detection device according to claim 15, wherein: It also includes an air-floating vibration isolation mechanism fixed to the device base, and the air-floating vibration isolation mechanism and the first object are located on both sides of the device base.

17. The micro LED display detection device according to claim 16, wherein: The air-floating vibration isolation mechanism includes an air-floating vibration isolator and a supporting platform. The equipment base and the supporting platform are distributed on both sides of the air-floating vibration isolator.

18. A method for detecting a micro LED display, characterized in that: include: Providing a first object to be inspected, wherein the first object has a first optical axis; providing a second object, the second object having a second optical axis, the first optical axis being aligned with the second optical axis; lighting up the first object to emit a test image; The second object acquires the image of the test chart, receives and analyzes the image of the test chart, and acquires optical parameters of the image of the test chart.

19. The method for detecting a micro LED display according to claim 18, wherein: The test chart is a completely white chart, and an image of the completely white chart is analyzed to obtain one or more of the brightness and chromaticity values, brightness uniformity, field of view angle, and distortion of the image of the test chart.

20. The method for detecting a micro LED display according to claim 18, wherein: The test chart is an ANSI contrast test chart, and the image of the ANSI contrast test chart is analyzed to obtain the contrast of the image of the test chart.

21. The method for detecting a micro LED display according to claim 18, wherein: The test chart is a black and white line pair chart, and the image of the black and white line pair chart is analyzed to obtain the modulation contrast of the image of the test chart.

22. The method for detecting a micro LED display according to claim 18, wherein: The optical parameters include one or more of brightness and chromaticity values, brightness uniformity, field of view, distortion, contrast and modulation contrast.

23. The method for detecting a micro LED display according to claim 18, wherein: It also includes a first alignment device electrically connected to the second object, located on one side of the first object and the second object, and used to emit a first light beam. The side of the first alignment device that emits the first light beam is opposite to the first object and the second object, so as to obtain a second image of the relative positional relationship between the first object and the second object.

24. The method for detecting a micro LED display according to claim 23, wherein: Also includes: a second alignment device electrically connected to the second object, and configured to emit a second light beam; Located above the first object and the second object, the second alignment device has a side that emits the second light beam opposite to the first object and the second object; wherein the first light beam is not parallel to the second light beam, and a third image of the relative positional relationship between the first object and the second object is obtained.

25. The method for detecting a micro LED display according to claim 24, wherein: The method for aligning the first optical axis with the second optical axis includes: the second object receives and analyzes the second image to obtain position information of the second image; the second object receives and analyzes the third image to obtain position information of the third image; based on the position information threshold of the second image, it is determined whether the position information of the second image meets the position information threshold of the second image; based on the position information threshold of the third image, it is determined whether the position information of the third image meets the position information threshold of the third image; when the position information of the second image meets the position information threshold of the second image and the position information of the third image meets the position information threshold of the third image, the alignment of the first object and the second object is completed.

26. The method for detecting a micro LED display according to claim 25, wherein: Also includes: When the position information of the second image does not meet the position information threshold of the second image and / or the position information of the third image does not meet the position information threshold of the third image, before acquiring the second image or the third image, adjust the position of the first object and / or the position of the second object.

27. The method for detecting a micro LED display according to claim 25, wherein: The method for obtaining the position information of the second image includes: identifying the first side contour line and the second side contour line of the second object in the second image, the third side contour line and the fourth side contour line of the light-emitting end of the first object; and obtaining the second symmetry line of the first side contour line and the second side contour line in the first direction and the third symmetry line of the third side contour line and the fourth side contour line in the first direction, and obtaining the second angle and the first distance formed between the second symmetry line and the third symmetry line, the first distance being the vertical distance from the center of one end of the first object close to the second object to the second symmetry line, the position information of the second image includes the first distance, the second angle, and the first direction is the direction in which the first object and the second object are located.

28. The method for detecting a micro LED display according to claim 25, wherein: The method for obtaining the position information of the third image includes: identifying the fifth side contour line and the sixth side contour line of the second object in the third image, and the seventh side contour line and the eighth side contour line of the light-emitting end of the first object; and obtaining the fourth symmetry line of the fifth side contour line and the sixth side contour line in the first direction, and the fifth symmetry line of the seventh side contour line and the eighth side contour line in the first direction, and obtaining the third angle and the second distance formed between the fourth symmetry line and the fifth symmetry line, the second distance being the vertical distance from the center of one end of the first object close to the second object to the fourth symmetry line, the position information of the third image includes the second distance and the third angle, and the first direction is the orientation of the first object and the second object.

29. The method for detecting a micro LED display according to claim 25, wherein: The method further includes using the second object to capture an image of the first object to obtain a first image.

30. The method for detecting a micro LED display according to claim 29, wherein: After acquiring the first image, it also includes: the second object receives the first image and identifies the first contour line of the first object close to the second object in the first image and the first symmetry line of the first image in the second direction; and acquires the angle between the first contour line and the first symmetry line as the first angle, and the second direction is perpendicular to the orientation of the first object and the second object.

31. The method for detecting a micro LED display according to claim 30, wherein: The second object receiving and analyzing the second image also includes: identifying the first front end contour line of the second object approaching the first object in the third direction, and the second front end contour line of the first object approaching the second object in the third direction; obtaining a third distance, the third distance being the vertical distance from the symmetry center of the second front end contour line to the first front end contour line, the third direction being perpendicular to the orientation of the first object and the second object, and obtaining position information of the first image, the position information of the first image including the first angle and the third distance.

32. The method for detecting a micro LED display according to claim 30, wherein: The second object receiving and analyzing the third image also includes: identifying the third front end contour line of the second object close to the first object in the first direction, and the fourth front end contour line of the first object close to the second object in the first direction; and obtaining a fourth distance, the fourth distance being the vertical distance from the symmetry center of the fourth front end contour line to the third front end contour line, the first direction being the orientation of the first object and the second object, obtaining position information of the first image, the position information of the first image including the first angle and the fourth distance.

33. The method for detecting a micro LED display according to claim 31 or 32, wherein: After obtaining the position information of the first image, it also includes judging whether the position information of the first image meets the position information threshold of the first image based on the position information threshold of the first image. When the position information of the first image meets the position information threshold of the first image, the alignment of the first object and the second object is completed.

34. The method for detecting a micro LED display according to claim 33, wherein: When the position information of the first image does not meet the position information threshold of the first image, the position of the first object and / or the position of the second object is adjusted before acquiring the first image.

Images