Optical lens and optical testing equipment

Abstract

The present disclosure provides an optical lens and an optical detection device, wherein the optical lens is used to adjust the propagation direction of light from a display panel, wherein the display panel at least includes a curved surface area and a plane area connected to the curved surface area, and the optical lens includes: a first area, including a first incident surface and a first exit surface arranged oppositely, wherein the first incident surface is used to receive a first light from the plane area when the display panel is detected, and the first light is emitted from the first exit surface after passing through the first area; a second area, connected to the first area, including a second incident surface and a second exit surface arranged oppositely, wherein the second incident surface is used to receive a second light from the curved surface area propagating along a first direction when the display panel is detected, and the second light is emitted from the second exit surface along a second direction after passing through the second area; wherein the first exit surface and the second exit surface are located in the same plane. The present disclosure can improve the accuracy of defect detection.

Description

Technical Field

[0001] The present disclosure relates to the field of optical technology, and in particular to an optical lens and an optical detection device. Background Art

[0002] The display panel is a major component of the display device, and the quality of the display panel determines the quality of the display device.

[0003] During the production process of display panels, defects such as cracks, bubbles or stains are easily generated on the display panels, and the display panels need to be inspected after they are manufactured. The accuracy of the inspection of display panels in the related art is low. Summary of the invention

[0004] The present disclosure provides an optical lens and an optical detection device to improve detection accuracy.

[0005] The present disclosure provides an optical lens for adjusting the propagation direction of light from a display panel, wherein the display panel at least includes a curved surface area and a flat surface area connected to the curved surface area, and the optical lens includes:

[0006] A first region includes a first incident surface and a first exit surface which are arranged opposite to each other, wherein the first incident surface is used to receive a first light from the plane region when the display panel is detected, and the first light is emitted from the first exit surface after passing through the first region;

[0007] The second area is connected to the first area and includes a second incident surface and a second exit surface which are arranged opposite to each other, wherein the second incident surface is used to receive a second light from the curved area and propagating along a first direction when the display panel is detected, and the second light is emitted from the second exit surface along a second direction after passing through the second area;

[0008] The first exit surface and the second exit surface are located in the same plane.

[0009] In an optional implementation, in a direction perpendicular to the interface between the first region and the second region, the second region includes a plurality of waveguide layers stacked together, and each of the waveguide layers is used to totally reflect the second light entering therein and then emit it from the second exit surface.

[0010] In an optional implementation manner, a coating is provided on a surface of each waveguide layer close to the first region and / or a surface far from the first region, and a refractive index of the coating is greater than a refractive index of the waveguide layer.

[0011] In an optional implementation, the material of the waveguide layer includes borosilicate crown glass, and the material of the coating is silver.

[0012] In an optional implementation manner, the plurality of waveguide layers divide the second incident surface into a plurality of sub-surfaces, and the areas of the sub-surfaces are the same.

[0013] In an optional implementation, in a direction perpendicular to an interface between the first region and the second region, a thickness of each of the waveguide layers is greater than or equal to 1.5 mm and less than or equal to 100 mm.

[0014] In an optional implementation, the first incident surface is arranged in parallel with the first exit surface.

[0015] In an optional implementation manner, along the direction of a boundary line between the first incident surface and the second incident surface, a cross-section of the second incident surface is in the shape of an arc.

[0016] In an optional implementation, the first incident surface is tangent to the circular arc.

[0017] In an optional implementation, the central angle of the arc is greater than or equal to 10° and less than or equal to 90°.

[0018] In an optional implementation, the radius of curvature of the arc is greater than or equal to 5 mm and less than or equal to 1000 mm.

[0019] In an optional implementation manner, the second area is arranged on two opposite sides of the periphery of the first area.

[0020] The present disclosure provides an optical detection device, comprising a stage, a light source, an image acquisition device, an image processing device, and an optical lens as described in any one of the items;

[0021] The carrier is used to carry the display panel;

[0022] The light source is used to provide an initial light incident on the display panel, so that the display panel reflects the initial light to the optical lens;

[0023] The optical lens is arranged between the stage and the image acquisition device;

[0024] The image acquisition device is used to acquire light from the first exit surface and the second exit surface of the optical lens and output image information;

[0025] The image processing device is used to receive the image information output by the image acquisition device and determine the defect information of the display panel.

[0026] In an optional implementation, when the display panel is detected, the orthographic projection of the second area on the display panel covers the curved area in a third direction, wherein the third direction is a direction perpendicular to a boundary line between the first incident surface and the second incident surface.

[0027] In an optional implementation, when the display panel is detected, the orthographic projection of the first area on the display panel may completely overlap with the plane area in the third direction.

[0028] In an optional implementation, along the direction of the boundary line between the first incident surface and the second incident surface, the cross-section of the second incident surface is a first arc, and when the display panel is detected, the cross-section of the curved area is a second arc, and the first arc and the second arc are concentrically arranged.

[0029] In an optional implementation, the center angles of the first circular arc and the second circular arc are the same.

[0030] In an optional implementation, a ratio of a radius of curvature of the first circular arc to a radius of curvature of the second circular arc is greater than or equal to 1.5 and less than or equal to 5.

[0031] In an optional implementation, the image acquisition device includes a CCD camera, the CCD camera is electrically connected to the image processing device, and a lens of the CCD camera faces the first exit surface.

[0032] In an optional implementation, the first direction is outside the field angle range of the CCD camera lens, and the second direction is within the field angle range of the CCD camera lens.

[0033] In an optional implementation, the number of the CCD camera is one.

[0034] Compared with the prior art, the present invention has the following advantages:

[0035] The optical lens and optical detection device provided by the present disclosure are used to adjust the propagation direction of light from the display panel. The first incident surface of the optical lens receives the first light from the flat area of ​​the display panel, and the first light is emitted from the first exit surface after passing through the first area; the second incident surface of the optical lens receives the second light from the curved area of ​​the display panel, and adjusts the propagation direction of the second light from the first direction to the second direction and then emits from the second exit surface. The second area of ​​the optical lens receives the divergent light from the curved area and adjusts the propagation direction of these light rays, so that the propagation direction of the light that cannot be collected by the image acquisition device can be adjusted to the direction that can be collected by the image acquisition device, thereby increasing the collection amount of light from the curved area. In addition, since the first exit surface and the second exit surface are located in the same plane, the image acquisition device collects the light emitted by the first exit surface and the second exit surface, thereby realizing the transformation of the collection surface from a non-planar surface to a planar surface, even if a single-camera image acquisition device is used, a clear display panel image can be obtained, thereby improving the accuracy of defect detection.

[0036] The above description is only an overview of the technical solution of the present disclosure. In order to more clearly understand the technical means of the present disclosure, it can be implemented according to the contents of the specification. In order to make the above and other purposes, features and advantages of the present disclosure more obvious and easy to understand, the specific implementation methods of the present disclosure are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure or related technologies, the following is a brief introduction to the drawings required for use in the embodiments or related technical descriptions. Obviously, the drawings described below are some embodiments of the present disclosure. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. It should be noted that the proportions in the drawings are only for illustration and do not represent the actual proportions.

[0038] Figure 1 A schematic diagram of a cross-sectional structure of a display panel is shown schematically;

[0039] Figure 2 The schematic diagram shows a structure of a detection device in the related art;

[0040] Figure 3 The cross-sectional structure diagram of an optical lens provided by the present disclosure is schematically shown;

[0041] Figure 4 The cross-sectional structure diagram of the optical lens and the display panel is schematically shown;

[0042] Figure 5A schematic diagram schematically shows a three-dimensional structure of an optical lens and a display panel;

[0043] Figure 6 Schematically shows a display panel image obtained without an optical lens and a schematic diagram of light flux distribution;

[0044] Figure 7 The display panel image and the light flux distribution diagram obtained when the optical lens is set are schematically shown;

[0045] Figure 8 A schematic diagram of the side structure of an optical detection device provided by the present disclosure is schematically shown. DETAILED DESCRIPTION

[0046] In order to make the purpose, technical solution and advantages of the embodiments of the present disclosure clearer, the technical solution in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the drawings in the embodiments of the present disclosure. Obviously, the described embodiments are part of the embodiments of the present disclosure, not all of the embodiments. Based on the embodiments in the present disclosure, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present disclosure.

[0047] During the production process, cracks, bubbles, stains and other defects may occur on the display panel. If they are not detected in time, it will cause waste of back-end processes and materials. The method of detecting the display panel is usually to obtain the overall appearance image of the display panel through a camera, and then use relevant software to identify defects in the appearance image. The inventors have found that for Figure 1 If a single camera is used to shoot the non-planar display panel shown, a clear appearance image cannot be obtained due to the existence of the curved surface area. In order to obtain a clear appearance image, multiple cameras can be used, such as Figure 2 The θ1 line scan camera, θ2 line scan camera and θ3 line scan camera in the image capture different curvature positions on the surface area, and then the images captured by multiple cameras are stitched together, and then the stitched images are used for defect detection. This detection method requires stitching multiple images and setting up multiple cameras, which increases the complexity of the detection equipment.

[0048] In order to solve the above problems, an embodiment of the present disclosure provides an optical lens for adjusting the propagation direction of light from a display panel. Figure 4 The cross-sectional structure diagram of the optical lens 41 and the display panel 42 is schematically shown. Figure 4 As shown, the display panel 42 at least includes a curved area and a flat area connected to the curved area.

[0049] Reference Figure 3The cross-sectional structure diagram of an optical lens provided by the present disclosure is schematically shown. Figure 3 and Figure 4 As shown, the optical lens comprises:

[0050] The first region 31 includes a first incident surface a1 and a first exit surface b1 which are arranged opposite to each other. The first incident surface a1 is used to receive the first light from the plane region when the display panel 42 is detected. The first light passes through the first region 31 and is emitted from the first exit surface b1.

[0051] The second area 32 is connected to the first area 31, and includes a second incident surface a2 and a second exit surface b2 that are relatively arranged. The second incident surface a2 is used to receive the second light from the curved area and propagating along the first direction when the display panel 42 is detected. After passing through the second area 32, the second light is emitted from the second exit surface b2 along the second direction.

[0052] In a specific implementation, when the display panel 42 is detected, as shown in FIG. Figure 8 As shown, the optical lens 41 can be disposed between the display panel 42 and the image acquisition device 82 . The optical lens 41 is used to adjust the propagation direction of the light from the display panel 42 . The light emitted from the first exit surface b1 and the second exit surface b2 of the optical lens 41 can be acquired by the image acquisition device 82 .

[0053] The first incident surface a1 of the optical lens 41 receives the first light from the flat area of ​​the display panel 42, and the first light is emitted from the first exit surface b1 after passing through the first area 31; the second incident surface a2 of the optical lens 41 receives the second light from the curved area of ​​the display panel 42, and adjusts the propagation direction of the second light from the first direction to the second direction, and then emits from the second exit surface b2. The second area 32 of the optical lens 41 receives the divergent light from the curved area, and adjusts the propagation direction of these light, so that the propagation direction of the light that cannot be collected by the image acquisition device 82 can be adjusted to the direction that can be collected by the image acquisition device 82, thereby increasing the amount of light collected from the curved area.

[0054] In this embodiment, the first emission surface b1 and the second emission surface b2 are located in the same plane.

[0055] In the related art, when the display panel 42 is detected, since the optical lens 41 is not provided, the acquisition surface of the image acquisition device 82 is a side surface of the display panel 42 close to the image acquisition device 82 , that is, the acquisition surface is non-planar.

[0056] In this embodiment, the optical lens 41 can be used to be set between the display panel 42 and the image acquisition device 82 when the display panel 42 is detected, so that the acquisition surface of the image acquisition device 82 is the first exit surface b1 and the second exit surface b2. Since the first exit surface b1 and the second exit surface b2 are located in the same plane, by setting the optical lens 41, the conversion of the acquisition surface from a non-planar surface to a planar surface can be achieved.

[0057] Since the first exit surface b1 and the second exit surface b2 are located in the same plane, the image acquisition device 82 can collect the light emitted from the first exit surface b1 and the second exit surface b2, thereby realizing the transformation of the collection surface from a non-planar surface to a planar surface. Even if the image acquisition device 82 is a single camera structure, it can obtain clear images of planar areas and curved areas, thereby improving the accuracy of defect detection.

[0058] In an optional implementation, in a direction perpendicular to the interface between the first region 31 and the second region 32, such as Figure 3 In the direction indicated by the arrow T, the second region 32 may include a plurality of waveguide layers 33 stacked in layers, each waveguide layer 33 being used to totally reflect the second light entering therein and then emit the second light from the second exit surface b2.

[0059] In this implementation, for each waveguide layer 33, the second light entering the waveguide layer 33 is totally reflected between the surface of the waveguide layer 33 close to the first region 31 and the surface of the waveguide layer 33 away from the first region 31, and then emitted from the second exit surface b2.

[0060] For each waveguide layer 33, the transmittance may be the ratio of the intensity of light passing through the waveguide layer 33 and emitted from the second exit surface b2 to the total intensity of light entering the waveguide layer 33. In order to improve the transmittance of the waveguide layer 33, in an optional implementation, a coating is provided on the surface of each waveguide layer 33 close to the first region 31 and / or on the surface away from the first region 31, and the refractive index of the coating is greater than the refractive index of the waveguide layer 33.

[0061] In this implementation, a coating may be provided on the surface of each waveguide layer 33 close to the first region 31, or a coating may be provided on the surface of each waveguide layer 33 away from the first region 31, or a coating may be provided on both the surface of each waveguide layer 33 close to the first region 31 and the surface of each waveguide layer 33 away from the first region 31. By providing the coating, the reflectivity of the light in the waveguide layer 33 may be increased and the refraction may be reduced.

[0062] The material of the waveguide layer 33 may include, for example, borosilicate crown glass, and the material of the coating may be, for example, a metal material such as silver. The borosilicate crown glass, i.e., BK7 glass, has a refractive index of 1.15872, an absorptivity of 0.0002001, and a transmittance of 0.998001. The refractive index of silver is 1.67. In a specific implementation, as long as the refractive index of the waveguide layer 33 is less than the refractive index of the coating, the present embodiment does not limit the material of the waveguide layer 33 and the material of the coating.

[0063] Optionally, the plurality of waveguide layers 33 divide the second incident surface a2 into a plurality of sub-surfaces, and the area of ​​each sub-surface is the same. The number of sub-surfaces is the same as the number of waveguide layers 33. Specifically, the second incident surface a2 is evenly divided into a plurality of sub-surfaces by the plurality of waveguide layers 33. The areas of the sub-surfaces may be the same, and the shapes of the sub-surfaces may be the same. Parts of different waveguide layers 33 located on the second incident surface a2 correspond to different sub-surfaces, that is, the surfaces of different waveguide layers 33 close to the display panel correspond to different sub-surfaces.

[0064] For example, the number of the waveguide layers 33 may be 10, and the waveguide layers 33 divide the second incident surface a2 into ten equal parts, that is, 10 sub-surfaces.

[0065] In a direction perpendicular to the interface between the first region 31 and the second region 32, as Figure 3 In the direction indicated by the middle arrow T, the thickness of each waveguide layer 33 can be greater than or equal to 1.5 mm and less than or equal to 100 mm. When the thickness of the waveguide layer 33 is within this range, it can not only meet the requirement of adjusting the propagation direction of the second light, but also ensure that the manufacturing difficulty of the waveguide layer 33 is within a controllable range, thereby reducing the cost.

[0066] In a specific implementation, the number of waveguide layers 33 and the thickness of each waveguide layer 33 can be designed according to actual conditions, and this embodiment does not limit this.

[0067] In this implementation, multiple waveguide layers 33 are arranged in the second area 32, and each waveguide layer 33 totally reflects the second light entering therein, thereby adjusting the propagation direction of the second light and converting the light from the curved area, i.e., the non-planar area, into light emitted from the second exit surface b2, i.e., the plane.

[0068] The inventor simulated two solutions, one without setting the optical lens 41 and the other with setting the optical lens 41, using simulation software. In both solutions, a single camera is used to obtain the image of the display panel 42. Figure 6 The left figure schematically shows a display panel image without an optical lens, and the right figure shows the distribution of luminous flux along the two lines g1 and h1 in the display panel image. Figure 7The left figure in the figure schematically shows a display panel image with an optical lens set, and the right figure shows the luminous flux distribution along the two lines g2 and h2 in the display panel image.

[0069] like Figure 6 As shown in the figure, the display panel image obtained by using a single camera without adding an optical lens 41 has a relatively divergent edge light, and the luminous flux in the curved area is sharply reduced. The luminous flux at the boundary of the curved area is only 0.0006-0.0007W / m 2 .like Figure 7 As shown in FIG. 1 , the display panel image obtained by using a single camera and adding an optical lens 41, under the condition that other parameters are the same, the luminous flux at the boundary of the curved area is increased to 0.0011 W / m 2 At the same time, the dispersion of light at the edge of the image is significantly weakened, which can effectively control the loss of light in the curved area. The camera can collect more light from the curved area, thereby improving the brightness of the image in the curved area and realizing accurate detection of defects in the curved area.

[0070] In an optional implementation, Figure 3 As shown, the first incident surface a1 and the first exit surface b1 may be arranged in parallel. Specifically, when the display panel 42 is detected, the first incident surface a1 and the first exit surface b1 may be parallel to the display panel 42, as shown in FIG. Figure 4 In a specific implementation, the first region 31 may be a plane glass of an integrated structure, and the material of the plane glass may be, for example, borosilicate crown glass.

[0071] In this implementation, the propagation direction of the first light before entering the first area 31 is the same as the propagation direction of the first light after emitting from the first area 31 .

[0072] It should be noted that the first region 31 may be any structure that can transmit the first light, for example, the first region 31 may also be a convex lens or other structure, which is not limited in this embodiment. The propagation direction of the first light before entering the first region 31 and after emitting from the first region 31 may be the same or different, which is not limited in this embodiment.

[0073] In an optional implementation, Figure 3 As shown, along the direction of the boundary line between the first incident surface a1 and the second incident surface a2, the shape of the cross section of the second incident surface a2 is an arc.

[0074] In the specific implementation, Figure 3 As shown, the first incident surface a1 and the second incident surface a2 may be tangent to each other. In this implementation, the first incident surface a1 is tangent to the arc.

[0075] The center angle of the arc may be greater than or equal to 10° and less than or equal to 90°. For example, the center angle of the arc may be 30°, 45°, 60°, etc. In a specific implementation, the center angle of the arc may be set according to the structure of the curved surface area of ​​the display panel 42 being tested, and this embodiment does not limit this.

[0076] The radius of curvature of the arc may be greater than or equal to 5 mm and less than or equal to 1000 mm. For example, the radius of curvature of the arc may be 6 mm, 10 mm, 100 mm, 500 mm, etc. In a specific implementation, the radius of curvature of the arc may be set according to the structure of the curved surface area of ​​the display panel 42 being tested, which is not limited in this embodiment.

[0077] It should be noted that the positional relationship between the second area 32 and the first area 31 can be designed according to the actual structure of the display panel, and the second area 32 can be set corresponding to the position of the curved area to ensure that the second area 32 can receive light from the curved area when the display panel is detected. For example, when the curved area of ​​the display panel is located outside the flat area, the second area 32 can be set correspondingly outside the first area 31.

[0078] In an optional implementation, Figure 4 As shown, if the curved area is arranged on two opposite sides of the periphery of the planar area, the second area 32 may be arranged on both opposite sides of the periphery of the first area 31. Optionally, the second area 32 may be arranged on both sides of the first area 31 symmetrically.

[0079] Optionally, if the curved area is arranged around the plane area, the second area 32 may be arranged around the first area 31. In this way, it is possible to ensure that the second light from the curved area enters the second area 32 as much as possible, thereby increasing the amount of light collected from the curved area.

[0080] Another embodiment of the present disclosure provides an optical detection device, referring to Figure 8 The side view structure diagram of an optical detection device provided by the present disclosure is schematically shown. Figure 8 As shown, the optical detection device includes a carrier 81, a light source, an image acquisition device 82, an image processing device, and an optical lens 41 provided in any of the above embodiments.

[0081] The stage 81 is used to carry the display panel 42. The display panel 42 is arranged on a side of the stage 81 close to the image acquisition device 82.

[0082] The light source is used to provide an initial light incident on the display panel 42 , so that the display panel 42 reflects the initial light to the optical lens 41 .

[0083] The optical lens 41 is disposed between the stage 81 and the image acquisition device 82. The relative positional relationship between the display panel 42 disposed on the stage 81 and the optical lens 41 can be as follows: Figure 4 and Figure 5 The display panel 42 and the optical lens 41 are spaced apart, and the distance between the two can be adjusted according to actual needs.

[0084] The image acquisition device 82 is used to acquire light from the first exit surface b1 and the second exit surface b2 of the optical lens 41 and output image information.

[0085] The image processing device is used to receive the image information output by the image acquisition device 82 and determine the defect information of the display panel 42.

[0086] In the present embodiment, since an optical lens 41 is arranged between the stage 81 and the image acquisition device 82, the light collection surface of the image acquisition device 82 is the first exit surface b1 and the second exit surface b2. Since the first exit surface b1 and the second exit surface b2 are located in the same plane, the light collection surface of the image acquisition device 82 is a plane. Therefore, even if the structure of the image acquisition device 82 is a single camera structure, a clear display panel image can be obtained, thereby improving the accuracy of defect detection.

[0087] When the structure of the image acquisition device is a single-camera structure, compared with a multi-camera structure, it can not only reduce the structural complexity of the detection equipment, but also avoid stitching the captured images of multiple cameras, thereby reducing the complexity of algorithm processing and improving the processing speed of the algorithm.

[0088] Due to the setting of the optical lens 41, the image acquisition device 82 can collect more light from the curved surface area, thereby improving the brightness of the image in the curved surface area, which is helpful to detect subtle defects and improve the detection precision and accuracy.

[0089] In this embodiment, when the display panel 42 is detected, the orthographic projection of the second area 32 on the display panel 42 overlaps with the curved area, which ensures that the second light from the curved area can enter the second area 32 .

[0090] In an optional implementation, Figure 4 As shown, when the display panel 42 is detected, the orthographic projection of the second area 32 on the display panel 42 covers the curved surface area in the third direction. In this way, it is possible to ensure that as many second light rays as possible enter the second area 32, thereby increasing the amount of light rays collected from the curved surface area. The third direction is a direction perpendicular to the boundary line between the first incident surface a1 and the second incident surface a2.

[0091] In this embodiment, when the display panel 42 is detected, the orthographic projection of the first area 31 on the display panel 42 overlaps with the plane area, ensuring that the first light from the plane area can enter the first area 31 .

[0092] In an optional implementation, Figure 4 As shown, when the display panel 42 is detected, the orthographic projection of the first area 31 on the display panel 42 can completely overlap with the plane area in the third direction, thereby ensuring that as many first light rays as possible enter the first area 31 while preventing the second light rays from the curved area from entering the first area 31.

[0093] Reference Figure 5 The schematic diagram of the three-dimensional structure of the optical lens 41 and the display panel 42 is shown schematically. Figure 5 In the figure, the orthographic projection of the first area 31 on the display panel 42 completely overlaps with the plane area, and the orthographic projection of the second area 32 on the display panel 42 completely overlaps with the curved area. In this way, the image of the entire display panel can be obtained by shooting once with a single camera, without moving the camera and the optical lens along the direction of the boundary between the first incident surface a1 and the second incident surface a2, and without image stitching, which can further improve the detection efficiency.

[0094] In an optional implementation, Figure 4 As shown, along the direction of the boundary line between the first incident surface a1 and the second incident surface a2, the cross-section of the second incident surface a2 is a first arc c1. When the display panel 42 is detected, the cross-section of the curved area is a second arc c2. The first arc c1 and the second arc c2 are concentrically arranged.

[0095] The second arc c2 is a cross section of a side surface of the curved area close to the optical lens, along the direction of the boundary line between the first incident surface a1 and the second incident surface a2.

[0096] The central angles of the first arc c1 and the second arc c2 may be the same or different, which is not limited in this embodiment.

[0097] When the first arc c1 and the second arc c2 are concentrically arranged, and the central angles of the first arc c1 and the second arc c2 are the same, the distance between the display panel 42 and the optical lens 41 is adjusted, and when the end of the curved surface area of ​​the display panel 42 close to the stage 81 is flush with the end of the second area 32 of the optical lens 41 close to the stage 81, it can be ensured that the orthographic projection of the second area 32 on the display panel 42 completely covers the curved surface area in the third direction, such as Figure 4 As shown, the orthographic projection of the second area 32 on the display panel 42 completely overlaps with the curved area in the third direction.

[0098] The ratio of the curvature radius of the first arc c1 to the curvature radius of the second arc c2 may be greater than or equal to 1.5 and less than or equal to 5. For example, the curvature radius of the first arc c1 may be twice the curvature radius of the second arc c2.

[0099] In this embodiment, the image acquisition device 82 may include a single high-definition industrial wide-angle camera. In an optional implementation, the image acquisition device 82 includes a CCD camera, and the CCD camera is electrically connected to the image processing device. In order to reduce the complexity of the detection equipment, the number of CCD cameras may be, for example, one.

[0100] like Figure 8 As shown, the lens of the CCD camera may face the first exit surface b1.

[0101] like Figure 8 As shown, when the display panel 42 is inspected, the minimum distance d between the lens of the CCD camera and the display panel 42 may be greater than or equal to 500 mm and less than or equal to 1000 mm.

[0102] In a specific implementation, the first direction may be outside the field angle θ of the CCD camera lens, and the second direction may be within the field angle θ of the CCD camera lens. In this way, it can be ensured that the image acquisition device 82 can collect more light from the curved surface area and improve the brightness of the image in the curved surface area.

[0103] like Figure 8 As shown, the field angle θ of the CCD camera lens can be greater than or equal to 90° and less than or equal to 100°.

[0104] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0105] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, commodity or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, commodity or device including the elements.

[0106] The optical lens and optical detection equipment provided by the present invention are introduced in detail above. The principles and implementation methods of the present invention are explained in this article using specific examples. The description of the above embodiments is only used to help understand the method of the present invention and its core idea. At the same time, for those skilled in the art, according to the idea of ​​the present invention, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.

[0107] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. The present disclosure is intended to cover any variations, uses or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The description and examples are to be considered exemplary only, and the true scope and spirit of the present disclosure are indicated by the following claims.

[0108] It should be understood that the present disclosure is not limited to the exact structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

[0109] References herein to "one embodiment," "embodiment," or "one or more embodiments" mean that a particular feature, structure, or characteristic described in conjunction with the embodiment is included in at least one embodiment of the present disclosure. In addition, please note that examples of the term "in one embodiment" herein do not necessarily all refer to the same embodiment.

[0110] In the description provided herein, a large number of specific details are described. However, it is understood that the embodiments of the present disclosure can be practiced without these specific details. In some instances, well-known methods, structures and techniques are not shown in detail so as not to obscure the understanding of this description.

[0111] In the claims, any reference signs placed between brackets shall not be construed as limiting the claims. The word "comprising" does not exclude the presence of elements or steps not listed in the claims. The word "a" or "an" preceding an element does not exclude the presence of a plurality of such elements. The present disclosure may be implemented by means of hardware comprising a number of different elements and by means of a suitably programmed computer. In a unit claim enumerating a number of means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third, etc. does not indicate any order. These words may be interpreted as names.

[0112] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present disclosure, rather than to limit them. Although the present disclosure has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. An optical lens, characterized in that: Used to adjust the propagation direction of light from a display panel, the display panel at least comprising a curved surface area and a flat surface area connected to the curved surface area, the optical lens comprising: A first region includes a first incident surface and a first exit surface which are arranged opposite to each other, wherein the first incident surface is used to receive a first light from the plane region when the display panel is detected, and the first light is emitted from the first exit surface after passing through the first region; a second region, connected to the first region, comprising a second incident surface and a second exit surface arranged opposite to each other, wherein the second incident surface is used to receive a second light from the curved region and propagating along a first direction when the display panel is detected, and the second light is emitted from the second exit surface along a second direction after passing through the second region; In a direction perpendicular to the interface between the first region and the second region, the second region includes a plurality of waveguide layers stacked in layers; each of the waveguide layers is used to totally reflect the second light entering therein and then emit it from the second exit surface; The plurality of waveguide layers divide the second incident surface into a plurality of sub-surfaces, and the areas of the sub-surfaces are the same; The first exit surface and the second exit surface are located in the same plane.

2. The optical lens according to claim 1, characterized in that: A coating is provided on a surface of each waveguide layer close to the first region and / or a surface far from the first region, and a refractive index of the coating is greater than a refractive index of the waveguide layer.

3. The optical lens according to claim 2, characterized in that: The material of the waveguide layer includes borosilicate crown glass, and the material of the coating layer is silver.

4. The optical lens according to claim 1, characterized in that: In a direction perpendicular to an interface between the first region and the second region, a thickness of each of the waveguide layers is greater than or equal to 1.5 mm and less than or equal to 100 mm.

5. The optical lens according to claim 1, characterized in that: The first incident surface is arranged in parallel with the first exit surface.

6. The optical lens according to claim 1, characterized in that: Along the direction of the boundary line between the first incident surface and the second incident surface, the shape of the cross section of the second incident surface is an arc.

7. The optical lens according to claim 6, characterized in that: The first incident surface is tangent to the circular arc.

8. The optical lens according to claim 6, characterized in that: The central angle of the arc is greater than or equal to 10° and less than or equal to 90°.

9. The optical lens according to claim 6, characterized in that: The radius of curvature of the arc is greater than or equal to 5 mm and less than or equal to 1000 mm.

10. The optical lens according to any one of claims 1 to 9, characterized in that: The second area is arranged on two opposite sides of the periphery of the first area.

11. An optical detection device, characterized in that: It comprises a stage, a light source, an image acquisition device, an image processing device and an optical lens as claimed in any one of claims 1 to 10; The carrier is used to carry the display panel; The light source is used to provide an initial light incident on the display panel, so that the display panel reflects the initial light to the optical lens; The optical lens is arranged between the stage and the image acquisition device; The image acquisition device is used to acquire light from the first exit surface and the second exit surface of the optical lens and output image information; The image processing device is used to receive the image information output by the image acquisition device and determine the defect information of the display panel.

12. The optical detection device according to claim 11, characterized in that: When the display panel is inspected, the orthographic projection of the second area on the display panel covers the curved surface area in a third direction, wherein the third direction is a direction perpendicular to a boundary line between the first incident surface and the second incident surface.

13. The optical detection device according to claim 12, characterized in that: When the display panel is inspected, the orthographic projection of the first area on the display panel may completely overlap with the plane area in the third direction.

14. The optical detection device according to claim 11, characterized in that: Along the direction of the boundary line between the first incident surface and the second incident surface, the cross section of the second incident surface is a first arc, and when the display panel is tested, the cross section of the curved area is a second arc, and the first arc and the second arc are concentrically arranged.

15. The optical detection device according to claim 14, characterized in that: The first circular arc and the second circular arc have the same central angle.

16. The optical detection device according to claim 14, characterized in that: A ratio of a curvature radius of the first circular arc to a curvature radius of the second circular arc is greater than or equal to 1.5 and less than or equal to 5.

17. The optical detection device according to any one of claims 11 to 16, characterized in that: The image acquisition device comprises a CCD camera, the CCD camera is electrically connected to the image processing device, and the lens of the CCD camera faces the first exit surface.

18. The optical detection device according to claim 17, characterized in that: The first direction is outside the field angle range of the CCD camera lens, and the second direction is within the field angle range of the CCD camera lens.

19. The optical detection device according to claim 17, characterized in that: The number of the CCD camera is one.

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