Optical detection system for naked-eye 3D display and detection method thereof

Abstract

The present application relates to a kind of optical detection system for naked eye 3D display screen and its detection method, including pedestal, clamping device, telescopic displacement mechanism and optical detection equipment.Clamping device is set in pedestal, including the first clamping arm and second clamping arm spaced apart along the first direction, the first clamping arm can be moved towards or away from the direction of second clamping arm, and the accommodation space for accommodating naked eye 3D display screen is formed between the first clamping arm and second clamping arm;Telescopic displacement mechanism is movably installed in pedestal along the second direction, and is connected with the output end of displacement driving part, and the second direction is perpendicular to the first direction;Optical detection equipment is installed in telescopic displacement mechanism, for detecting the optical parameter of naked eye 3D display screen.Through the above-mentioned setting, the size of accommodation space is adjusted to hold different specifications naked eye 3D display screen;The measurement distance between optical detection equipment and naked eye 3D display screen is adjustable by the movement of telescopic displacement mechanism, and the measurement of different products can be adapted.

Description

Technical Field

[0001] This invention relates to the field of optical inspection technology, and in particular to an optical inspection system and method for naked-eye 3D displays. Background Technology

[0002] A glasses-free 3D display refers to a display screen that allows users to experience 3D visuals without wearing any auxiliary devices, thanks to glasses-free 3D display technology. Different manufacturers and specifications of glasses-free 3D displays have variations in optical design and manufacturing processes, resulting in inconsistent performance in core optical parameters such as crosstalk, brightness uniformity, petal angle, and depth of field. This directly impacts the viewing experience and product competitiveness. Therefore, measuring the optical parameters of glasses-free 3D displays using testing equipment is a crucial step in product development optimization, factory quality inspection, and market access certification.

[0003] The measurement distance between the optical inspection device and the glasses-free 3D display increases with the size of the display screen. Current inspection equipment requires different inspection settings when inspecting glasses-free 3D displays of different sizes, making it difficult for existing equipment to flexibly adapt to the measurement needs of various glasses-free 3D display sizes. Summary of the Invention

[0004] Therefore, it is necessary to provide an optical inspection system and its inspection method for naked-eye 3D displays, addressing the problem that current inspection equipment is difficult to adapt to different specifications of naked-eye 3D displays.

[0005] An optical inspection system for glasses-free 3D displays includes a base, a clamping device, a stacking and displacement mechanism, and optical inspection equipment, wherein: The clamping device is disposed on the base and includes a first clamping arm and a second clamping arm spaced apart along a first direction. The first clamping arm is movable toward or away from the second clamping arm, and an accommodating space for accommodating a naked-eye 3D display screen is formed between the first clamping arm and the second clamping arm. The stacking displacement mechanism is movably mounted on the base in a second direction and connected to the output end of the displacement drive member. It is used to move in the second direction under the drive of the displacement drive member, and the second direction is perpendicular to the first direction. The optical detection device is installed on the stacking displacement mechanism and is used to detect the optical parameters of the naked-eye 3D display screen.

[0006] In one embodiment, the stacking displacement mechanism includes a plurality of displacement rods arranged sequentially along a third direction, wherein the third direction, the second direction, and the first direction are perpendicular to each other; The two adjacent displacement rods are slidably connected, and each displacement rod can slide relative to the other along the second direction. The displacement rod is connected to the output end of the displacement drive.

[0007] In one embodiment, the number of displacement rods is odd, and the displacement rod located in the middle of the plurality of displacement rods is connected to the output end of the displacement drive.

[0008] In one embodiment, a control drive mechanism is included, which is disposed on the base. The output end of the control drive mechanism is connected to the clamping device. The control drive mechanism is used to drive the clamping device to move along a third direction and rotate around the first direction. The first direction, the second direction, and the third direction are perpendicular to each other.

[0009] In one embodiment, the control drive mechanism includes a sliding plate, a control turntable, and a mounting bracket, wherein: The sliding plate is slidably mounted on the base along the third direction; The control turntable is rotatably mounted on the sliding plate around its own axis, and the axis of the control turntable is parallel to the first direction; The mounting frame and the second clamping arm are disposed on the control turntable, and the mounting frame is provided with the first clamping arm that can move along the first direction.

[0010] In one embodiment, the optical inspection device includes an inspection drive mechanism, an inspection turntable, a spectroradiometer, and an industrial camera module, wherein: The detection drive mechanism is disposed on the stacking displacement mechanism, and its output end is connected to the detection turntable, which is used to drive the detection turntable to move along the first direction and rotate around its own axis. The spectroradiometer and the industrial camera module are arranged at circumferential intervals along the detection turntable. The spectroradiometer is used to detect the crosstalk, brightness uniformity, lobe angle, color uniformity, and contrast of the naked-eye 3D display screen. The industrial camera module is used to detect the depth of field, 3D stereoscopic effect, and moiré pattern of the naked-eye 3D display screen.

[0011] In one embodiment, the system includes a control unit and an interactive screen communicatively connected to the control unit, the interactive screen being used for user input of commands and generation of control signals; The control unit is also communicatively connected to the displacement drive, the adjustment drive mechanism and the detection drive mechanism, and controls the operation of the displacement drive, the adjustment drive mechanism and the detection drive mechanism according to the control signal.

[0012] The aforementioned optical inspection system for glasses-free 3D displays allows for the adjustment of the size of the accommodating space between the first and second clamping arms—allowing for the stable clamping of glasses-free 3D displays of different specifications—by enabling the first clamping arm to move towards or away from the second clamping arm. Simultaneously, the stacking displacement mechanism moves under the drive of a displacement actuator, causing the optical inspection equipment mounted on the stacking displacement mechanism to move synchronously. This allows for adjustable measurement distance between the optical inspection equipment and the glasses-free 3D display, solving the problem of existing inspection equipment requiring different specifications of inspection settings to adapt to different products. This significantly improves the versatility of the inspection equipment and reduces inspection costs and operational complexity.

[0013] This application also provides an optical inspection method for a naked-eye 3D display screen. The optical inspection method employs the aforementioned optical inspection system for naked-eye 3D display screens. The optical inspection system for naked-eye 3D display screens includes an intelligent calibration module communicatively connected to the control unit. The intelligent calibration module includes a laser calibration emitter and an image acquisition unit. The laser calibration emitter is disposed on the inspection turntable. The optical inspection method includes the following steps: The laser calibration emitter emits a laser to the naked-eye 3D display screen; The image acquisition device acquires the positional deviation information between the center point of the naked-eye 3D display screen and the laser position on the naked-eye 3D display screen; The control unit controls the adjustment drive mechanism and the detection drive mechanism to operate according to the position deviation information, so that the laser position coincides with the center point of the naked-eye 3D display screen.

[0014] In one embodiment, the laser calibration emitter, the spectroradiometer, and the industrial camera module are distributed circumferentially along the detection turntable, and the optical detection method includes: The control unit controls the detection drive mechanism to drive the detection turntable to rotate by a set angle, so as to switch to the center point where the spectroradiometer is facing the naked-eye 3D display screen.

[0015] In one embodiment, a slide rail is provided on the base, and the slide rail is provided with a scale. A reference plate is provided with a slider adapted to the slide rail. The side of the reference plate closest to the optical detection device is provided with a marking graphic, and the side of the reference plate furthest from the optical detection device is provided with an LED backlight module opposite to the marking graphic. The optical detection method includes: Calibrate the spectroradiometer so that it is directly facing the center point of the naked-eye 3D display screen; The control unit controls the detection drive mechanism to drive the detection turntable to rotate, and switches the spectroradiometer to the center point of the industrial camera module facing the naked-eye 3D display screen. Turn on the LED backlight module of the reference board, move the reference board away from the naked-eye 3D display screen until the part of the 3D image displayed on the naked-eye 3D display screen that is outside the screen is clear at the same time as the reference board, and the industrial camera module records the first distance value of the reference board's movement. The reference plate is moved along a direction close to the naked-eye 3D display screen until the part of the 3D image entering the screen and the reference plate are both clear at the same time, and the industrial camera module records the second distance value of the movement of the reference plate. The control unit calculates the sum of the first distance value and the second distance value as the depth distance.

[0016] The optical inspection method for naked-eye 3D displays described above uses the aforementioned optical inspection system for naked-eye 3D displays and has the beneficial effects of the optical inspection system for naked-eye 3D displays, which will not be repeated here. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0018] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of an optical inspection system for a naked-eye 3D display screen provided in an embodiment of this application.

[0020] Figure 2 for Figure 1 A schematic diagram of the optical inspection system for naked-eye 3D displays from another perspective.

[0021] Figure 3 This is a schematic diagram of the structure of an optical inspection device provided in an embodiment of this application.

[0022] Figure 4 This is a flowchart illustrating an optical inspection method for a naked-eye 3D display screen according to an embodiment of this application.

[0023] Figure 5This is a schematic diagram showing the division of multiple test grids for a naked-eye 3D display screen provided in an embodiment of this application.

[0024] Explanation of reference numerals in the attached figures: 10. Optical inspection system for glasses-free 3D displays; a. First direction; b. Second direction; c. Third direction; 20. Mesh to be measured; 100. Base; 110. Platform; 120. Base plate; 200, clamping device; 210, first clamping arm; 211, first receiving cavity; 220, second clamping arm; 221, second receiving cavity; 230, insertion bracket; 240, suction cup; 300. Stacking displacement mechanism; 310. Displacement rod; 320. Connecting frame; 321. Horizontal plate; 322. Vertical plate; 400. Optical inspection equipment; 410. Inspection drive mechanism; 411. Mounting rod; 412. Connecting shaft; 420. Inspection turntable; 430. Spectroradiometer; 440. Industrial camera module; 441. First industrial camera; 442. Second industrial camera; 450. Infrared rangefinder; 500. Control drive mechanism; 510. Sliding plate; 520. Control turntable; 530. Mounting bracket; 531. Connecting cylinder; 532. Support column; 600. Reference board. Detailed Implementation

[0025] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.

[0026] In the description of this application, it should be understood that if terms such as "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" appear, these terms indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0027] Furthermore, where the terms "first" and "second" appear, these terms are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, where the term "multiple" appears, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0028] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0029] The technical solutions provided by the embodiments of the present invention are described below with reference to the accompanying drawings.

[0030] See Figure 1 and Figure 2 As shown, one embodiment of this application provides an optical inspection system 10 for a naked-eye 3D display screen. The optical inspection system 10 for a naked-eye 3D display screen includes a base 100, a clamping device 200, a stacking displacement mechanism 300, and an optical inspection device 400.

[0031] The clamping device 200 is disposed on the base 100 and includes a first clamping arm 210 and a second clamping arm 220 spaced apart along a first direction a. The first clamping arm 210 is movable toward or away from the second clamping arm 220, forming an accommodating space for accommodating a glasses-free 3D display screen. Through this arrangement, the size of the accommodating space can be flexibly adjusted by moving the first clamping arm 210 toward or away from the second clamping arm 220, allowing for stable clamping of glasses-free 3D display screens of different specifications, and covering a wide range of product models.

[0032] In a specific configuration, the base 100 includes a platform 110 and two base plates 120 spaced apart from the platform 110. The side of the platform 110 facing away from the base plates 120 is used to mount the clamping device 200. Multiple support feet are provided at the ends of the base plates 120 to adjust the levelness of the base 100. To maintain strength, the base 100 is preferably made of steel.

[0033] A stacking displacement mechanism 300 is movably mounted on the base 100 along a second direction b. The stacking displacement mechanism 300 is connected to the output end of a displacement drive component. The stacking displacement mechanism 300 is used to move along the second direction b under the drive of the displacement drive component. The second direction b is perpendicular to the first direction a. Specifically, the second direction b is the width direction of the base 100, and the first direction a is the vertical direction. An optical inspection device 400 is mounted on the stacking displacement mechanism 300 and is used to inspect the optical parameters of the naked-eye 3D display screen.

[0034] With the above configuration, when the displacement drive unit drives the stacking displacement mechanism 300 to move relative to the base 100 along the second direction b, the stacking displacement mechanism 300 drives the optical inspection device 400 connected to it to move synchronously, realizing the movement of the optical inspection device 400 relative to the clamping device 200 on the base 100, thereby adjusting the measurement distance between the optical inspection device 400 and the naked-eye 3D display screen on the clamping device 200. This solves the drawback of currently requiring the replacement of inspection equipment of different specifications to adapt to products of different specifications, reduces the investment cost and replacement time of inspection equipment, and improves inspection efficiency.

[0035] In other embodiments, the optical inspection device 400 can be slidably connected to the stacking displacement mechanism 300. Specifically, one of the optical inspection device 400 and the stacking displacement mechanism 300 is provided with a slider, and the other is provided with a slide rail. The slider is connected to a drive motor. With the above configuration, the measurement distance between the optical inspection device 400 and the naked-eye 3D display screen can be finely adjusted.

[0036] It should be noted that the measurement distance between the optical inspection device and the naked-eye 3D display increases with the size of the naked-eye 3D display screen. In order to meet the measurement distance requirements, the stacking displacement mechanism 300 that drives the optical inspection device to move will occupy a large space, which is not conducive to storage and operation.

[0037] Based on this, to save space, in some embodiments, the stacked displacement mechanism 300 includes a plurality of displacement rods 310 arranged sequentially along a third direction c, wherein the third direction c, the second direction b, and the first direction a are perpendicular to each other. Specifically, the third direction c is the length direction of the base 100, the second direction b is the width direction of the base 100, and the first direction a is the vertical direction. Adjacent displacement rods 310 are slidably connected, and each displacement rod 310 can slide relative to each other along the second direction b. The displacement rods 310 are connected to the output end of the displacement driving member. The displacement rod 310 connected to the displacement driving member is referred to as the first displacement rod 310.

[0038] With the above configuration, when the first displacement rod 310 moves to the terminal along the second direction b under the drive of the displacement drive member, the displacement rod 310 adjacent to the first displacement rod 310 then begins to slide, thereby realizing the unfolding and retraction of the stacking displacement mechanism 300. When unfolded and extended, the stacking displacement mechanism 300 can meet the measurement distance requirements corresponding to different screen sizes; when retracted and folded, it can minimize the overall space occupied by the stacking displacement mechanism 300, facilitating the storage and transportation of the optical inspection system 10 used for naked-eye 3D displays and reducing space occupation.

[0039] To ensure the stable and balanced operation of the stacked displacement mechanism 300, in some embodiments, the number of displacement rods 310 is odd. Along a third direction c, the displacement rod 310 located in the middle position of the plurality of displacement rods 310 is connected to the output end of the displacement drive component. In specific configurations, the number of displacement rods 310 can be 3, 7, 11, 13, or more, and the displacement drive component is preferably a drive motor. As mentioned above, the displacement rod 310 connected to the displacement drive component is referred to as the first displacement rod 310. Through the above configuration, the displacement rods 310 located on both sides of the first displacement rod 310 can move synchronously.

[0040] Furthermore, multiple displacement rods 310 are disposed in the accommodating space between the two base plates 120. Among the multiple displacement rods 310, the two displacement rods 310 distributed at both ends of the third direction c can move relative to the two base plates 120 along the second direction b in a one-to-one correspondence, so as to further save space. In a specific configuration, the stacking displacement mechanism 300 also includes a connecting frame 320 disposed in the accommodating space. The connecting frame 320 is U-shaped and has a horizontal plate 321 and two vertical plates 322 spaced apart from the horizontal plate 321. The multiple displacement rods 310 are disposed in the U-shaped connecting frame 320, and the two displacement rods 310 distributed at both ends of the third direction c are slidably connected to the two vertical plates 322. By moving the displacement rods 310 relative to the vertical plates 322, the displacement rods 310 can move relative to the base plate 120 connected to the vertical plates 322.

[0041] During assembly, the connecting frame 320 can be detachably installed on the base plate 120 using fasteners such as screws and bolts. The sliding connection between two adjacent displacement rods 310, and the sliding connection between the displacement rod 310 and the longitudinal plate 322, can be achieved through the cooperation of a slider and a slide rail, but is not limited to this slider-slide rail cooperation; it can also be a gear-rack cooperation. For example, on the two mutually facing sides of two adjacent displacement rods 310, one may be equipped with a gear, and the other with a rack adapted to the gear; or one may be equipped with a slider, and the other with a slide rail adapted to the gear.

[0042] To facilitate the alignment of the test point on the naked-eye 3D display screen with the optical inspection device 400, in some embodiments, the optical inspection system 10 for the naked-eye 3D display screen includes a control drive mechanism 500 disposed on the base 100. The output end of the control drive mechanism 500 is connected to the clamping device 200. The control drive mechanism 500 is used to drive the clamping device 200 to move along a third direction c, and also to drive the clamping device 200 to rotate around a first direction a. The first direction a, the second direction b, and the third direction c are all perpendicular to each other. Specifically, the third direction c is the length direction of the base 100, the second direction b is the width direction of the base 100, and the first direction a is the vertical direction.

[0043] With the above configuration, the control drive mechanism 500 can drive the naked-eye 3D display screen on the clamping device 200 to translate along the third direction c and rotate around the first direction a, so that the test point on the naked-eye 3D display screen is directly opposite the optical inspection device 400. The optical inspection device 400 adjusts its measurement distance from the test point through the stacking displacement mechanism 300 to meet the measurement requirements.

[0044] To facilitate the design of the control drive mechanism 500, the control drive mechanism 500 includes a sliding plate 510, a control turntable 520, and a mounting bracket 530. The sliding plate 510 is slidably mounted on the base 100 along a third direction c. In a specific configuration, a slider is mounted on the sliding plate 510, and a slide rail adapted to the slider is mounted on the support platform of the base 100, with the slide rail extending in the third direction c. The output end of the control transverse drive component is connected to the slider, and the control transverse drive component drives the slider to move relative to the extension direction of the slide rail, thereby enabling the sliding plate 510 connected to the slider to slide relative to the support platform with the slide rail mounted along the third direction c.

[0045] The control turntable 520 is rotatably mounted on the sliding plate 510 around its own axis, and the axis of the control turntable 520 is parallel to the first direction a. Specifically, the control turntable 520 contains a drive motor, a worm gear, and a turbine. Specifically, the fixed end of the drive motor is mounted on the sliding plate 510, and the output end of the drive motor is connected to the worm gear. The worm gear is rotatably mounted on the sliding plate 510, and the worm gear meshes with the turbine. The central connecting shaft 412 of the turbine is connected to the center of the control turntable 520. Through this configuration, the drive motor drives the worm gear to rotate, thereby causing the control turntable 520, which is connected to the turbine, to rotate.

[0046] Mounting bracket 530 and second clamping arm 220 are mounted on control turntable 520. Mounting bracket 530 is provided with first clamping arm 210 that can move along a first direction a, where the first direction a is vertical. In specific configuration, the second clamping arm 220 and the first clamping arm 210 are respectively provided with corresponding second accommodating cavity 221 and first accommodating cavity 211. The second accommodating cavity 221 and the first accommodating cavity 211 are arranged opposite to each other along the first direction a. The cavity walls of the second accommodating cavity 221 and the cavity walls of the first accommodating cavity 211 are used to clamp the naked-eye 3D display screen.

[0047] To facilitate the movement of the first clamping arm 210 toward or away from the second clamping arm 220, in some embodiments, the mounting bracket 530 includes a connecting cylinder 531 disposed on the control turntable 520, and the clamping device 200 further includes a plug-in bracket 230, one end of which is connected to the first clamping arm 210, and the other end of which is axially movable and plugged into the connecting cylinder 531.

[0048] In a specific configuration, the connecting cylinder 531 has an inner cavity to accommodate the insertion bracket 230. The connecting cylinder 531 also has a mounting hole communicating with its own inner cavity. Bolts, screws, and other fasteners pass through the mounting hole and abut against the insertion bracket 230 inside the connecting cylinder 531 to fix the insertion bracket 230. With this configuration, loosening the fasteners and moving the insertion bracket 230 up and down causes the first clamping arm 210 on the insertion bracket 230 to rise and fall vertically, thereby enabling the first clamping arm 210 to move towards or away from the second clamping arm 220.

[0049] To enhance the fixation of the glasses-free 3D display screen, in some embodiments, the mounting bracket 530 further includes a support column 532 disposed on the control turntable 520. The support column 532 is spaced apart from the connecting cylinder 531, and the support column 532 is provided with a suction cup 240 for adsorbing the glasses-free 3D display screen.

[0050] Combination Figure 2 and Figure 3 As shown, in order to perform comprehensive optical parameter testing on a naked-eye 3D display screen, in some embodiments, the optical testing device 400 includes a testing drive mechanism 410, a testing turntable 420, a spectroradiometer 430, and an industrial camera module 440. The testing drive mechanism 410 is disposed on the stacking displacement mechanism 300, and its output end is connected to the testing turntable 420. The testing drive mechanism 410 drives the testing turntable 420 to move along a first direction a, and also drives the testing turntable 420 to rotate around its own axis. The axis of the testing turntable 420 is parallel to the first direction a, which is a vertical direction.

[0051] Spectroradiometer 430 and industrial camera module 440 are arranged circumferentially along the detection turntable 420. Spectroradiometer 430 is used to detect crosstalk, brightness uniformity, lobe angle, color uniformity and contrast of naked-eye 3D display screen. Industrial camera module 440 is used to detect depth of field, 3D stereoscopic effect and moiré pattern of naked-eye 3D display screen.

[0052] With the above settings, the detection turntable 420 is driven to move up and down along the first direction a by the detection drive mechanism 410, which facilitates the synchronous movement of the optical detection equipment 400 connected to it, so that the optical detection equipment 400 is facing the test point of the naked-eye 3D display screen. By driving the detection turntable 420 to rotate by the detection drive mechanism 410, the switching between the spectroradiometer 430 and the industrial camera module 440 can be easily realized, so as to perform various optical parameter detections on the naked-eye 3D display screen.

[0053] In a specific configuration, the spectroradiometer 430 and the industrial camera module 440 are distributed along the radial direction of the detection turntable 420 on both sides of the turntable 420. Switching between the two can be achieved by rotating the detection turntable 420 180°. It should be noted that the spectroradiometer 430 and the industrial camera module 440 can also be distributed at any angle from 0° to 360° along the circumference of the detection turntable 420, such as 30°, 60°, etc., and switching can be achieved by rotating the detection turntable 420 at the corresponding angle.

[0054] To facilitate the design of the detection drive mechanism 410, in some embodiments, the detection drive mechanism 410 includes a mounting rod 411 and a connecting shaft 412. The mounting rod 411 is disposed on the stacking displacement mechanism 300, and the connecting shaft 412 is slidably mounted on the mounting rod 411 along the first direction a. In a specific configuration, the mounting rod 411 is provided with a transmission screw along its own axial direction. The transmission screw is connected to the output end of the drive motor, and a matching transmission nut is sleeved on the transmission screw. The transmission nut is connected to the connecting shaft 412.

[0055] With the above configuration, the drive motor drives the drive screw to rotate, which in turn causes the drive nut on the drive screw to move along the axial direction of the drive screw. The drive nut causes the connecting shaft 412 connected to it to move up and down axially relative to the drive screw. The drive screw is also set along the axial direction of the mounting rod 411, thereby realizing the axial movement of the connecting shaft 412 relative to the mounting rod 411. The axial direction of the mounting rod 411 is parallel to the first direction a.

[0056] The testing turntable 420 is rotatably mounted on the connecting shaft 412 about its own axis. Specifically, the testing turntable 420 is rotatably sleeved on the connecting shaft 412, and the testing turntable 420 is connected to the output end of the rotary drive motor.

[0057] To enable intelligent detection of glasses-free 3D displays, in some embodiments, the optical detection system 10 for glasses-free 3D displays includes a control unit and an interactive screen communicatively connected to the control unit. The interactive screen is used for user input of commands and generation of control signals. The control unit is also communicatively connected to a displacement drive, a control drive mechanism 500, and a detection drive mechanism 410. The control unit controls the operation of the displacement drive, control drive mechanism 500, and detection drive mechanism 410 according to the control signals.

[0058] It should also be noted that, during the actual measurement, the optical inspection system 10 used for the naked-eye 3D display needs to be deployed in a dark room environment. Preferably, the ambient light intensity of the dark room is ≤0.1 cd / m². Before the optical inspection device 400 performs the formal measurement, the positions of the optical inspection device 400 and the naked-eye 3D display need to be calibrated.

[0059] Based on this, combined Figure 4 As shown, this application also provides an optical inspection method for a glasses-free 3D display screen, which employs the aforementioned optical inspection system 10 for glasses-free 3D display screens. The optical inspection system 10 for glasses-free 3D display screens includes an intelligent calibration module communicatively connected to a control unit. The intelligent calibration module includes a laser calibration emitter and an image acquisition unit, with the laser calibration emitter positioned on the inspection turntable 420.

[0060] Optical detection methods include the following steps: Step S1: The laser calibration emitter emits a laser to the naked-eye 3D display screen; Step S2: The image acquisition device acquires the positional deviation information between the center point of the naked-eye 3D display screen and the laser position on the naked-eye 3D display screen; Step S3: The control unit controls the operation of the adjustment drive mechanism 500 and the detection drive mechanism 410 according to the positional deviation information, so that the laser position coincides with the center point of the naked-eye 3D display screen.

[0061] To facilitate the adjustment of the optical inspection device 400 to the laser position, in some embodiments, the laser calibration emitter, spectroradiometer 430, and industrial camera module 440 are distributed circumferentially around the inspection turntable 420. Specifically, the laser calibration emitter is located between the spectroradiometer 430 and the industrial camera module 440. The laser calibration emitter and the spectroradiometer 430, or the laser calibration emitter or industrial camera module 440, are distributed circumferentially around the inspection turntable 420 at predetermined angles. These predetermined angles can be any value from 0° to 360°, such as 20°, 40°, 65°, or 90°.

[0062] With the above setup, the optical detection method includes: Step S4, the control unit controls the detection drive mechanism 410 to drive the detection turntable 420 to rotate by a set angle, so as to switch the spectroradiometer 430 to face the center point of the naked-eye 3D display screen. It is easy to understand that after the laser emitted by the laser calibration emitter to the naked-eye 3D display screen is adjusted to be directly aligned with the center of the naked-eye 3D display screen, rotating the detection turntable 420 switches the laser calibration emitter to the spectroradiometer 430, so that the spectroradiometer 430 is directly aligned with the center of the naked-eye 3D display screen, completing the calibration of the spectroradiometer 430. This allows the spectroradiometer 430 to perform subsequent optical detection.

[0063] By rotating the inspection turntable 420, the spectroradiometer 430 can be switched to the industrial camera module 440, so that the industrial camera module 440 is directly facing the center of the naked-eye 3D display screen, completing the calibration of the industrial camera module 440. This is to facilitate subsequent optical inspection of the industrial camera module 440.

[0064] In the specific setup, the laser calibration emitter, spectroradiometer 430, and industrial camera module 440 are positioned at the same height so that by rotating the detection turntable 420, all three can be positioned directly opposite the naked-eye 3D display screen.

[0065] As mentioned earlier, the measurement distance between the optical inspection device and the naked-eye 3D display increases with the screen size of the naked-eye 3D display. This requires intelligently ensuring that the distance between the optical inspection device 400 and the naked-eye 3D display meets the set distance requirements.

[0066] In the specific setup, the control unit is communicatively connected to the infrared rangefinder 450, which is positioned above the spectroradiometer 430, with their arrangement parallel to the first direction a. With this setup, after the spectroradiometer 430 completes calibration, the light emitted by the infrared rangefinder 450 is located directly above or below the calibration point on the naked-eye 3D display screen. The distance between the infrared rangefinder 450 and the naked-eye 3D display screen along the second direction b is the same as the distance between the spectroradiometer 430 and the naked-eye 3D display screen along the second direction b. By adjusting the distance between the infrared rangefinder 450 and the naked-eye 3D display screen along the second direction b, the required distance can be achieved.

[0067] It is easy to understand that by rotating the detection turntable 420, the industrial camera module 440 can be rotated to the same position as the spectroradiometer 430 relative to the naked-eye 3D display screen. That is, when the distance between the spectroradiometer 430 and the naked-eye 3D display screen along the second direction b meets the set distance, the distance between the industrial camera module 440 and the naked-eye 3D display screen along the second direction b also meets the set distance.

[0068] The optical detection method includes: Step S5, the infrared rangefinder 450 detects the distance information between itself and the naked-eye 3D display screen; Step S6, the control unit controls the operation of the displacement drive component based on the distance information. In specific settings, the user inputs the size information of the naked-eye 3D display screen to be tested via an interactive screen; the control unit matches the measured distance value between the optical detection device and the naked-eye 3D display screen of that size based on the size information and the built-in program; the control unit compares the measured distance value with the actual measured distance information transmitted by the infrared rangefinder 450, and controls the displacement drive component to move the optical detection device 400 to a set distance from the naked-eye 3D display screen.

[0069] In its specific configuration, the intelligent calibration module also includes temperature sensors, humidity sensors, and ambient light sensors to collect data on the temperature, humidity, and ambient light of the darkroom. This allows for real-time acquisition of the darkroom's environmental parameters. The control unit then uses a built-in compensation algorithm to correct the data measured by the infrared rangefinder 450 and the image acquisition device based on these environmental parameters, eliminating the influence of environmental factors on measurement accuracy. The control unit is preferably a PLC controller, and the image acquisition device is preferably an industrial camera.

[0070] After the optical inspection equipment 400 completes calibration, the spectroradiometer 430 in the optical inspection equipment 400 measures the contrast, color uniformity, brightness uniformity, crosstalk, and lobe angle of the naked-eye 3D display screen; the industrial camera module 440 in the optical inspection equipment 400 measures the 3D stereoscopic effect, depth of field, and moiré pattern of the naked-eye 3D display screen.

[0071] The glasses-free 3D display screen is electrically connected to the power supply, and the control unit is communicatively connected to both the power supply and the glasses-free 3D display screen. It is easy to understand that the power supply is electrically connected to all electrical components in this application to provide power, and the power supply of this application has overvoltage, overcurrent, and short-circuit protection to ensure stable system operation.

[0072] Contrast ratio refers to the ratio of the maximum brightness of a pure white image to the minimum brightness of a pure black image displayed on a glasses-free 3D screen. A higher contrast ratio results in richer tones of light and dark areas, clearer details in both dark and bright areas, and enhances the realism of the 3D image.

[0073] When performing contrast measurement, the control unit controls the naked-eye 3D display to display a pure white image, and the spectroradiometer 430 collects the brightness value Lmax of the central area of ​​the naked-eye 3D display; the control unit controls the naked-eye 3D display to display a pure black image, and the spectroradiometer 430 collects the brightness value Lmin of the central area of ​​the naked-eye 3D display; the control unit calculates the contrast of the naked-eye 3D display according to the formula: contrast ratio = Lmax / Lmin and stores it in the control unit.

[0074] Color uniformity refers to the degree of color consistency in different areas of a naked-eye 3D display screen. It is evaluated by measuring the deviation between the color coordinates of each area, such as the CIE 1931 coordinates. The smaller the color deviation, the better the color uniformity.

[0075] When measuring color uniformity, the user inputs the size information of the naked-eye 3D display screen and the number of test points via the interactive screen. The control unit divides the naked-eye 3D display screen into multiple test grids 20 according to the number of test points. For example, when the number of test points is 9, the control unit divides the naked-eye 3D display screen into 9 test grids 20, such as... Figure 5 As shown. It is easy to understand that the center of the grid to be tested 20 is the position of the point to be tested in the naked-eye 3D display screen.

[0076] The control unit controls the movement of the adjustment drive mechanism 500 and the detection drive mechanism 410 based on the distance signal value between the center point of the grid to be measured 20 and the center point of the naked-eye 3D display screen, so that the spectroradiometer 430 is directly facing each point to be measured on the naked-eye 3D display screen. The spectroradiometer 430 collects the chromaticity coordinates of each point to be measured, specifically, CIE 1931 coordinates.

[0077] The control unit calculates the deviation between the chromaticity coordinates of each test point and the chromaticity coordinates of the center point of the naked-eye 3D display screen. The largest deviation among the multiple deviation values ​​is the chromaticity uniformity index.

[0078] Brightness uniformity refers to the degree of consistency in brightness across different areas of a naked-eye 3D display screen. It is typically characterized by the deviation rate between the brightness values ​​at each measurement point and the average brightness value, or the ratio of the maximum brightness to the minimum brightness. Specifically, the deviation rate is calculated as (|brightness value at the measurement point - average brightness value|) / average brightness value * 100%. A smaller deviation rate or a ratio closer to 1 indicates better brightness uniformity.

[0079] During the specific measurement of brightness uniformity, the control unit uses the distance signal between the center point of the grid under test 20 and the center point of the naked-eye 3D display screen to control the movement of the adjustment drive mechanism 500 and the detection drive mechanism 410, ensuring that the spectroradiometer 430 is directly facing each test point on the naked-eye 3D display screen. The spectroradiometer 430 collects brightness data for each test point three times. The control unit takes the average of the three brightness data for each test point as the brightness value of that test point.

[0080] The control unit calculates the average brightness value of all brightness values ​​and the deviation rate between each brightness value and the average brightness value. The maximum deviation rate is the brightness uniformity index, and a brightness distribution heat map is generated.

[0081] Crosstalk: Naked-eye 3D displays are based on the principle of binocular parallax. Crosstalk refers to the phenomenon where the originally designed separate image signals for the left and right eyes leak and overlap with each other in a 3D display. The crosstalk level is a core indicator for evaluating the separation of 3D displays. The lower the value, the better the isolation between the left and right eye images, which can effectively reduce ghosting and blurring during viewing and improve image quality. , where CTp: crosstalk coefficient at position p; V: number of viewpoints; Iv,p: luminous intensity of the v-th viewpoint at position p.

[0082] When performing crosstalk measurement, the control unit controls the movement of the adjustment drive mechanism 500 and the detection drive mechanism 410 based on the distance signal value between the center point of the grid under test 20 and the center point of the naked-eye 3D display screen, so that the spectroradiometer 430 is facing each test point on the naked-eye 3D display screen, and the test point is also the viewpoint.

[0083] When the spectroradiometer 430 is directly facing the test point on the naked-eye 3D display screen, the control unit controls the naked-eye 3D display screen to illuminate the test grid 20, while other grid areas remain completely black. Preferably, the illumination time for each test grid 20 is 30 seconds. The control unit controls the adjustment drive mechanism 500 to drive the clamping device 200 to rotate, thereby rotating the naked-eye 3D display screen on the clamping device 200. Specifically, the naked-eye 3D display screen is rotated in 0.5° increments, with the test point rotating 70 degrees to the left and right within a range. The spectroradiometer 430 collects and stores brightness data after each angle adjustment.

[0084] The control unit calculates the crosstalk coefficient at each angular position according to the crosstalk coefficient calculation formula, and generates a curve of crosstalk coefficient changing with angle.

[0085] Lobe angle: refers to the effective field of view angle of a single viewpoint or test point on a naked-eye 3D display screen, that is, the angle range within which the light emitted from that viewpoint can be normally observed and meets the preset brightness threshold. The size of the lobe angle directly determines the effective viewing range of the 3D display. The larger the lobe angle, the wider the viewing angle range, and the better the experience for multiple people watching at the same time.

[0086] When performing the specific lobe angle measurement, the control unit controls the movement of the adjustment drive mechanism 500 and the detection drive mechanism 410 based on the distance signal value between the center point of the grid to be measured 20 and the center point of the naked-eye 3D display screen, so that the spectroradiometer 430 is facing each point to be measured on the naked-eye 3D display screen.

[0087] When the spectroradiometer 430 is directly facing the test point on the naked-eye 3D display screen, the control unit controls the naked-eye 3D display screen to illuminate the test grid 20, while other grid areas remain completely black. Preferably, the illumination time for each test grid 20 is 30 seconds. The control unit controls the adjustment drive mechanism 500 to drive the clamping device 200 to rotate, thereby rotating the naked-eye 3D display screen on the clamping device 200. Specifically, the naked-eye 3D display screen is rotated in steps of 0.5°, with the test point rotating 70 degrees to the left and right. The spectroradiometer 430 captures a picture of the screen after each angle adjustment.

[0088] The control unit combines effective brightness area identification and brightness threshold judgment to find the maximum and minimum angles corresponding to each test point. The difference between the two is the lobe angle of that viewpoint. All test points are measured repeatedly, and the average value is taken as the screen lobe angle index.

[0089] 3D stereoscopic effect: The ability of a viewer to perceive spatial stereoscopic effect without the aid of auxiliary equipment. The qualified standard is that the image captured at the observation position only presents the preset full red or full green monochrome without color mixing or gradation. If it is not qualified, the above-mentioned interference phenomena will appear, which subjectively manifest as a blurry and distorted 3D stereoscopic effect.

[0090] During the 3D stereoscopic effect measurement, the control unit controls the detection drive mechanism 410 to drive the detection turntable 420 to rotate, thereby switching the spectroradiometer 430 to the industrial camera module 440. Specifically, the industrial camera module 440 includes a first industrial camera 441 and a second industrial camera 442 spaced apart. The first industrial camera 441 and the second industrial camera 442 are used to simulate the human eye to capture 3D images of the naked-eye 3D display screen. The control unit synthesizes the images captured by the first industrial camera 441 and the second industrial camera 442 and analyzes the stereoscopic effect.

[0091] Moiré patterns: Moiré patterns are interference stripes caused by manufacturing errors of the grating and the superposition of pixels in the display screen. They are one of the core characteristics for judging whether 3D is qualified. The appearance of these stripes indicates that the display screen's light splitting and imaging accuracy is insufficient, and it cannot achieve a normal naked-eye 3D visual effect.

[0092] When performing moiré pattern measurement, the control unit controls the movement of the adjustment drive mechanism 500 and the detection drive mechanism 410 based on the distance signal value between the center point of the grid to be measured 20 and the center point of the naked-eye 3D display screen, so that the industrial camera module 440, specifically, the first industrial camera 441 or the second industrial camera 442 in the industrial camera module 440, is facing each point to be measured on the naked-eye 3D display screen.

[0093] When the first industrial camera 441 or the second industrial camera 442 in the industrial camera module 440 is facing the point to be measured on the naked-eye 3D display screen, the first industrial camera 441 or the second industrial camera 442 takes a picture of the point to be measured. The control unit analyzes and calculates the moiré pattern based on the captured image.

[0094] Depth of field: refers to the effective distance range between the image protruding from and entering the screen in a 3D image displayed on a glasses-free 3D display. Protruding from the screen means the image extends beyond the front of the screen, while entering the screen means the image is recessed behind the screen. It is a key indicator of the strength of the 3D display's stereoscopic effect. The greater the depth of field, the more obvious the spatial layering of the 3D image, and the stronger the viewer's sense of immersion.

[0095] In the specific depth-of-field measurement, a reference plate 600 is provided on the base 100, which can slide relative to the width direction of the base 100. Specifically, a slide rail is provided on the side wall of the stage 110 in the base 100, and a slider is provided on the reference plate 600. The slide rail is also provided with a scale. The reference plate 600 is a transparent plate, specifically an acrylic plate. The side of the reference plate 600 closest to the optical detection device 400 has a marking graphic, preferably a V-shaped marking, but not limited to V-shape, and can also be any shape such as a circle or √. The marking graphic is coated with a white high-reflective coating, and the side of the reference plate 600 furthest from the optical detection device 400 has an LED backlight module opposite to the marking graphic.

[0096] Steps S1, S2, S3, and S4 are executed to calibrate the spectroradiometer 430, ensuring it is aligned with the center point of the naked-eye 3D display screen. The control unit controls the detection drive mechanism 410 to rotate the detection turntable 420, switching the spectroradiometer 430 so that the industrial camera module 440 is aligned with the center point of the naked-eye 3D display screen. Specifically, either the first industrial camera 441 or the second industrial camera 442 in the industrial camera module 440 is aligned with the center point of the naked-eye 3D display screen.

[0097] Turn on the LED backlight module of the reference board 600. The initial position of the reference board 600 is on the same plane as the naked-eye 3D display screen. Using the initial position as a reference, move the reference board 600 away from the naked-eye 3D display screen until the part of the 3D image displayed on the naked-eye 3D display screen that extends beyond the screen becomes clear at the same time as the reference board 600. The first industrial camera 441 or the second industrial camera 442 in the industrial camera module 440 records the first distance value of the movement of the reference board 600, which is the distance beyond the screen.

[0098] The reference plate 600 is moved along the direction close to the naked-eye 3D display screen until the part of the 3D image entering the screen and the reference plate 600 are clear at the same time. The first industrial camera 441 or the second industrial camera 442 in the industrial camera module 440 records the second distance value of the movement of the reference plate 600, that is, the distance into the screen.

[0099] The control unit calculates the sum of the first distance value and the second distance value as the depth distance, and records and stores the depth distance.

[0100] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0101] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. An optical inspection system for glasses-free 3D displays, characterized in that, It includes a base, a clamping device, a control and drive mechanism, a stacking and displacement mechanism, and optical inspection equipment, wherein: The clamping device is disposed on the base and includes a first clamping arm and a second clamping arm spaced apart along a first direction. The first clamping arm is movable toward or away from the second clamping arm. An accommodating space for accommodating a naked-eye 3D display screen is formed between the first clamping arm and the second clamping arm. A slide rail is provided on the base, and a scale is provided on the slide rail. A reference plate is provided with a slider adapted to the slide rail. The side of the reference plate close to the optical detection device is provided with an identification graphic, and the side of the reference plate away from the optical detection device is provided with an LED backlight module opposite to the identification graphic. The control drive mechanism includes a sliding plate, a control turntable, and a mounting frame. The sliding plate is slidably assembled on the base along a third direction. The control turntable is rotatably mounted on the sliding plate about its own axis. The axis of the control turntable is parallel to the first direction. The mounting frame and the second clamping arm are disposed on the control turntable. The mounting frame is provided with the first clamping arm that can move along the first direction. The stacked displacement mechanism is movably mounted on the base along the second direction and includes a plurality of displacement rods arranged sequentially along the third direction. Adjacent displacement rods are slidably connected, and each displacement rod can slide relative to the other along the second direction. The number of displacement rods is odd. The displacement rod located in the middle of the plurality of displacement rods is connected to the output end of the displacement drive. The third direction, the second direction, and the first direction are perpendicular to each other. The optical inspection equipment includes an inspection drive mechanism, an inspection turntable, a spectroradiometer, and an industrial camera module; the inspection drive mechanism is disposed on the stacking displacement mechanism, and its output end is connected to the inspection turntable, for driving the inspection turntable to move along the first direction and rotate around its own axis; the spectroradiometer and the industrial camera module are arranged at circumferential intervals along the inspection turntable.

2. The optical inspection system for naked-eye 3D displays according to claim 1, characterized in that, The mounting frame includes a connecting cylinder disposed on the control turntable; The clamping device further includes a plug-in bracket, one end of which is connected to the first clamping arm, and the other end of which can be axially inserted into the connecting cylinder.

3. The optical inspection system for naked-eye 3D displays according to claim 2, characterized in that, The mounting frame also includes a support column disposed on the control turntable. The support column is spaced apart from the connecting cylinder, and the support column is provided with a suction cup for adsorbing the naked-eye 3D display screen.

4. The optical inspection system for naked-eye 3D displays according to claim 1, characterized in that, The spectroradiometer is used to detect crosstalk, brightness uniformity, lobe angle, color uniformity, and contrast of the naked-eye 3D display screen, and the industrial camera module is used to detect the depth of field, 3D stereoscopic effect, and moiré pattern of the naked-eye 3D display screen.

5. The optical inspection system for naked-eye 3D displays according to claim 1, characterized in that, It includes a control unit and an interactive screen that is communicatively connected to the control unit. The interactive screen is used for user input of commands and generation of control signals. The control unit is also communicatively connected to the displacement drive, the adjustment drive mechanism, and the detection drive mechanism, and controls the operation of the displacement drive, the adjustment drive mechanism, and the detection drive mechanism according to the control signal.

6. An optical inspection method for glasses-free 3D displays, characterized in that, The optical inspection method employs the optical inspection system for naked-eye 3D displays as described in claim 5. The optical inspection system for naked-eye 3D displays includes an intelligent calibration module communicatively connected to the control unit. The intelligent calibration module includes a laser calibration emitter and an image acquisition unit. The laser calibration emitter is disposed on the inspection turntable. The optical inspection method includes the following steps: The laser calibration emitter emits a laser to the naked-eye 3D display screen; The image acquisition device acquires the positional deviation information between the center point of the naked-eye 3D display screen and the laser position on the naked-eye 3D display screen; The control unit controls the adjustment drive mechanism and the detection drive mechanism to operate according to the position deviation information, so that the laser position coincides with the center point of the naked-eye 3D display screen.

7. The optical detection method according to claim 6, characterized in that, The laser calibration emitter, the spectroradiometer, and the industrial camera module are distributed circumferentially along the detection turntable, and the optical detection method includes: The control unit controls the detection drive mechanism to drive the detection turntable to rotate by a set angle, so as to switch to the center point where the spectroradiometer is facing the naked-eye 3D display screen.

8. The optical detection method according to claim 7, characterized in that, The optical detection method includes: Calibrate the spectroradiometer so that it is directly facing the center point of the naked-eye 3D display screen; The control unit controls the detection drive mechanism to drive the detection turntable to rotate, and switches the spectroradiometer to the center point of the industrial camera module facing the naked-eye 3D display screen. Turn on the LED backlight module of the reference board, move the reference board away from the naked-eye 3D display screen until the part of the 3D image displayed on the naked-eye 3D display screen that is outside the screen is clear at the same time as the reference board, and the industrial camera module records the first distance value of the reference board's movement. The reference plate is moved along a direction close to the naked-eye 3D display screen until the part of the 3D image entering the screen and the reference plate are both clear at the same time, and the industrial camera module records the second distance value of the movement of the reference plate. The control unit calculates the sum of the first distance value and the second distance value as the depth distance.

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