Optical structure and display device

Abstract

The invention discloses an optical structure and a display device. The optical structure comprises a lens assembly, a transflective film, a reflective polarization layer and a phase delay film. The lens assembly comprises a first lens and a second lens which are provided with optical film materials in the middle, and the optical film materials comprise at least one of a reflective polarization layer and a phase delay film. The part, located in the assembling area, of the lens assembly comprises a ridge connection structure, and the ridge connection structure comprises a first ridge connection part of the first lens. The part, located in the imaging area, of the surface of the first lens comprises a first position and a second position, the ridge combining surface of the first ridge combining part comprises a third position and a fourth position, in the first direction, the third position is closer to the first position than the fourth position, and the distance between the first position and the second position in the first direction is a first distance; the distance between the third position and the first position in the first direction is a second distance, and the ratio of the first distance to the second distance is 0.9-1.1. According to the optical structure, the first distance is matched with the second distance, so that the stretching and attaching effect of the optical film material is improved.

Description

Technical Field

[0001] Embodiments of the present disclosure relate to an optical structure and a display device. Background Art

[0002] Generally, when a lens assembly includes a plurality of lenses arranged in a stacked manner, effective optical axis center alignment is required between the lenses to ensure imaging quality. Among them, the alignment method can adopt the engagement method, and the alignment position of the engagement method is generally set in the non-imaging area of the lens assembly to prevent the imaging quality from being affected. Summary of the Invention

[0003] The present disclosure provides an optical structure and a display device.

[0004] An embodiment of the present disclosure provides an optical structure, including: a lens assembly, a transmissive-reflective film, a reflective polarizing layer, and a phase retardation film. The lens assembly includes at least a first lens and a second lens. The surface of the first lens facing the second lens is a first surface, and the surface of the second lens facing the first lens is a second surface. Both the first surface and the second surface are curved surfaces; the transmissive-reflective film is located on one side of the first lens away from the second lens or on one side of the second lens away from the first lens; the phase retardation film is located on one side of the transmissive-reflective film facing the reflective polarizing layer. An optical film material is disposed between the first surface and the second surface, and the optical film material includes at least one of the reflective polarizing layer and the phase retardation film; the lens assembly includes an imaging area and an assembly area surrounding the imaging area. The part of the lens assembly located in the assembly area includes an engagement structure, and the engagement structure includes a first engagement portion located on the first lens and a second engagement portion located on the second lens. The first engagement portion and the second engagement portion are oppositely arranged and complementary in shape to position the first lens and the second lens. The first engagement portion includes an engagement surface, and the engagement surface is a non-planar surface; the part of the first surface located in the imaging area includes a first position and a second position that are the farthest apart in a first direction parallel to the optical axis. The second position is located at the edge of the imaging area. The engagement surface includes a third position and a fourth position. The fourth position is closer to the imaging area than the third position. In the first direction, the third position is closer to the first position than the fourth position. The distance between the first position and the second position in the first direction is a first distance, the distance between the third position and the first position in the first direction is a second distance, and the ratio of the first distance to the second distance is 0.9 to 1.1.

[0005] For example, according to an embodiment of the present disclosure, the third position is located on at least one side of the imaging area in a second direction perpendicular to the optical axis. The size of the imaging area in the second direction is the imaging size. The minimum distance between the second position and the nearest third position in the second direction is the third distance, and the ratio of the third distance to the imaging size is 0.01 to 0.05.

[0006] For example, according to an embodiment of the present disclosure, the distance between the third position and the fourth position in the first direction is the fourth distance, and the ratio of the central thickness of the first lens to the fourth distance is 2 to 3.5.

[0007] For example, according to an embodiment of the present disclosure, the first engaging portion includes a first sub-engaging portion, a second sub-engaging portion, and a third sub-engaging portion that are arranged in sequence around the imaging area. In the orthographic projection of the first surface on a plane perpendicular to the optical axis, the line connecting the center of the first surface and the center of the first sub-engaging portion is the first line, the line connecting the center and the center of the second sub-engaging portion is the second line, and the line connecting the center and the center of the third sub-engaging portion is the third line. The angle between the first line and the second line is 135 degrees, the angle between the second line and the third line is 90 degrees, and the angle between the third line and the first line is 135 degrees.

[0008] For example, according to an embodiment of the present disclosure, the fourth distance is less than the first distance.

[0009] For example, according to an embodiment of the present disclosure, the engaging surface further includes a fifth position away from the imaging area at the third position. In the first direction, the third position is closer to the first position than the fifth position.

[0010] For example, according to an embodiment of the present disclosure, in the first direction, the distance between the third position and the fourth position is the fourth distance, the distance between the fifth position and the third position is the fifth distance, and the ratio of the fourth distance to the fifth distance is 0.9 to 1.1.

[0011] For example, according to an embodiment of the present disclosure, the first sub-engaging portion, the second sub-engaging portion, and the third sub-engaging portion have the same shape.

[0012] For example, according to an embodiment of the present disclosure, the surface of the first lens located between at least two of the first sub-engaging portion, the second sub-engaging portion, and the third sub-engaging portion includes a plane.

[0013] For example, according to an embodiment of the present disclosure, the surface of the first lens located between at least two of the first sub-engagement portion, the second sub-engagement portion, and the third sub-engagement portion includes a groove.

[0014] For example, according to an embodiment of the present disclosure, the first sub-engagement portion includes a positioning member.

[0015] For example, according to an embodiment of the present disclosure, the edge of the optical film material is located at the second position.

[0016] For example, according to an embodiment of the present disclosure, the orthographic projection of the optical film material on a plane perpendicular to the optical axis does not overlap with the orthographic projection of the engagement structure on the plane.

[0017] For example, according to an embodiment of the present disclosure, the first position is located in the central area of the imaging area, the second position is located in the edge area of the imaging area, and the second position surrounds the first position.

[0018] For example, according to an embodiment of the present disclosure, the portions of the first surface and the second surface located in the imaging area are both spherical or aspherical.

[0019] For example, according to an embodiment of the present disclosure, the second surface has a complementary surface shape to the first surface.

[0020] For example, according to an embodiment of the present disclosure, the optical structure further includes: a linear polarizing film, located on a side of the reflective polarizing layer away from the transmissive-reflective film.

[0021] Another embodiment of the present disclosure provides a display device, including a display screen and any one of the above optical structures, and the display screen is located on a side of the transmissive-reflective film away from the reflective polarizing layer. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings of the embodiments will be briefly introduced below. Obviously, the drawings in the following description only relate to some embodiments of the present disclosure and do not limit the present disclosure.

[0023] Figure 1 FIG. is a schematic cross-sectional structure diagram of an optical structure provided according to an embodiment of the present disclosure.

[0024] Figure 2 is Figure 1 a schematic plan structure diagram of the optical structure shown.

[0025] Figure 3 is a cross-sectional view of the first lens taken along the AA' line shown in Figure 2 FIG.

[0026] Figure 4 andFigure 5 Partial cross-sectional structural schematic diagrams of partial structures along the optical structure shown, taken along line BB' in different examples. Figure 2

[0027] Figure 6 Cross-sectional view of an optical structure provided by another example according to an embodiment of the present disclosure.

[0028] Figure 7A and Figure 7B Partial cross-sectional structural schematic diagrams of the first engaging portion in other examples according to embodiments provided by the present disclosure.

[0029] Figure 8 In Figure 1 Schematic diagram after stretching and attaching an optical film material to the first lens of the optical structure shown.

[0030] Figure 9 Partial structural schematic diagram of a display device provided according to another embodiment of the present disclosure. Detailed implementation manners

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present disclosure clearer, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present disclosure. Obviously, the described embodiments are some, but not all, of the embodiments of the present disclosure. All other embodiments obtained by those of ordinary skill in the art based on the described embodiments of the present disclosure without creative efforts shall fall within the scope of protection of the present disclosure.

[0032] Unless otherwise defined, the technical terms or scientific terms used in the present disclosure shall have the ordinary meanings understood by those of ordinary skill in the art to which the present disclosure pertains. The "first", "second", and similar terms used in the present disclosure do not denote any order, quantity, or importance, but are only used to distinguish different components. The terms such as "including" or "comprising" mean that the elements or items appearing before this word cover the elements or items listed after this word and their equivalents, without excluding other elements or items.

[0033] Features such as "parallel", "perpendicular", and "identical" used in the embodiments of the present disclosure include the strictly defined features of "parallel", "perpendicular", "identical", etc., as well as cases with certain errors such as "substantially parallel", "substantially perpendicular", and "substantially identical". Considering measurement and errors associated with the measurement of specific quantities (e.g., limitations of the measurement system), it means within the acceptable deviation range for a specific value determined by those of ordinary skill in the art. For example, "substantially" can mean within one or more standard deviations, or within 10% or 5% of the value. When the quantity of a component is not specifically indicated in the following text of the embodiments of the present disclosure, it means that the component can be one or more, or can be understood as at least one. "At least one" means one or more, and "a plurality" means at least two.

[0034] In the research, the inventors of the present application found that: in the process of laminating a film on the curved surface of a lens, it is necessary to stretch the optical film material to achieve adhesion to the curved surface of the lens. When multiple lenses are aligned by the snap-fit method, due to limitations of the lens's own structure, such as its shape, etc., when the surface of the lens is adhered to the optical film material, problems such as the optical film material being unable to effectively adhere to the surface of the lens, resulting in detachment, optical glue bubbles, and other process problems may occur. In addition, the general snap-fit method cannot effectively position optical film materials such as phase retardation films and reflective polarizing layers, resulting in the optical film material having a rotation angle after being adhered to the lens and being unable to form the best circularly polarized light.

[0035] Embodiments of the present disclosure provide an optical structure and a display device. The optical structure includes a lens assembly, a transmissive-reflective film, a reflective polarizing layer, and a phase retardation film. The lens assembly includes at least a first lens and a second lens. The surface of the first lens facing the second lens is a first surface, and the surface of the second lens facing the first lens is a second surface. Both the first surface and the second surface are curved surfaces. The transmissive-reflective film is located on the side of the first lens away from the second lens or on the side of the second lens away from the first lens. The phase retardation film is located on the side of the transmissive-reflective film facing the reflective polarizing layer. An optical film material is disposed between the first surface of the first lens and the second surface of the second lens. The optical film material includes at least one of the reflective polarizing layer and the phase retardation film. The lens assembly includes an imaging area and an assembly area surrounding the imaging area. The part of the lens assembly located in the assembly area includes a snap-fit structure. The snap-fit structure includes a first snap-fit portion located on the first lens and a second snap-fit portion located on the second lens. The first snap-fit portion and the second snap-fit portion are oppositely arranged and complementary in shape to position the first lens and the second lens. The first snap-fit portion includes a snap-fit surface, and the snap-fit surface is a non-planar surface. The part of the first surface located in the imaging area includes a first position and a second position that are the farthest apart in a first direction parallel to the optical axis. The second position is located at the edge of the imaging area. The snap-fit surface includes a third position and a fourth position. The fourth position is closer to the imaging area than the third position. In the first direction, the third position is closer to the first position than the fourth position. The distance between the first position and the second position in the first direction is a first distance, and the distance between the third position and the first position in the first direction is a second distance. The ratio of the first distance to the second distance is 0.9 to 1.1.

[0036] In the optical structure provided by the present disclosure, by setting the first distance in the imaging area to match the second distance in the assembly area, the stretching and fitting effect of the optical film material on the first surface or the second surface can be improved, so as to avoid problems such as detachment between the optical film material and the lens surface and optical glue bubbles when the optical film material is stretched to fit the lens. In addition, the snap-fit structure located in the assembly area can also position the optical film material between the first surface and the second surface to form circularly polarized light.

[0037] The optical structure and the display device provided by the embodiments of the present disclosure will be described below with reference to the accompanying drawings.

[0038] Figure 1 is a schematic cross-sectional structure diagram of the optical structure provided by the embodiments of the present disclosure. Figure 2 is Figure 1 a schematic plan structure diagram of the optical structure shown. Figure 3 is along Figure 2 a cross-sectional view of the first lens taken along the AA' line shown.

[0039] As Figure 1As shown, the optical structure includes a lens assembly 10, a transmissive-reflective film 20, a reflective polarizing layer 30, and a phase retardation film 40. The lens assembly 10 includes at least a first lens 100 and a second lens 200. Figure 1 Schematically, the lens assembly 10 is shown to include two lenses, such as the first lens 100 and the second lens 200, but is not limited thereto. The lens assembly 10 may also include more lenses.

[0040] Such as Figure 1 As shown, the surface of the first lens 100 facing the second lens 200 is the first surface 110, and the surface of the second lens 200 facing the first lens 100 is the second surface 210. Both the first surface 110 and the second surface 210 are curved surfaces.

[0041] In some examples, such as Figure 1 As shown, the second surface 210 and the first surface 110 have complementary surface profiles. For example, the first surface 110 and the second surface 210 can be fully adhered (without considering the adhesive layer between them and the optical film 340). For example, at least a part of the first surface 110 can be a concave surface, and at least a part of the second surface 210 can be a convex surface. For example, the first lens 100 further includes a third surface 120 away from the surface of the second lens 200. For example, the third surface 120 can be a convex surface. For example, the second lens 200 further includes a fourth surface 220 away from the first lens 100. For example, the fourth surface 220 can be a concave surface.

[0042] Such as Figure 1 As shown, the transmissive-reflective film 20 is located on the side of the first lens 100 away from the second lens 200 or on the side of the second lens 200 away from the first lens 100. For example, the transmissive-reflective film 20 is located on the third surface 120 of the first lens 100. For example, the transmissive-reflective film 20 is coated on the third surface 120 of the first lens 100.

[0043] Such as Figure 1 As shown, the reflective polarizing layer 30, such as is located on the side of the transmissive-reflective film 20 facing the lens assembly 10; the phase retardation film 40 is located on the side of the transmissive-reflective film 20 facing the reflective polarizing layer 30. For example, Figure 1 Schematically, the phase retardation film 40 is shown to be located between the reflective polarizing layer 30 and the transmissive-reflective film 20, but is not limited thereto. The phase retardation film 40 can also be located on the side of the reflective polarizing layer 30 away from the transmissive-reflective film 20.

[0044] In some examples, such as Figure 1 As shown, the optical structure further includes a linear polarizing film 50, located on the side of the reflective polarizing layer away from the transmissive-reflective film 20. For example, the linear polarizing film 50 can be located on the fourth surface 220 of the second lens 200. For example, the linear polarizing film 50 can be adhered to the fourth surface 220 of the second lens 200.

[0045] For example, as Figure 1 shown, the transmissive and reflective film 20 is configured to transmit some light and reflect the other part of the light. For example, the transmissive and reflective film 20 may include at least one film layer, and the thickness of each film layer may be 10 to 200 nanometers. For example, the transmittance of the transmissive and reflective film 20 may be 50%, and the reflectivity may be 50%. For example, the transmittance of the transmissive and reflective film 20 may be 60%, and the reflectivity may be 40%. For example, the transmittance of the transmissive and reflective film 20 may be 65%, and the reflectivity may be 35%. The optical structure provided by the present disclosure is not limited thereto, and the transmittance and reflectivity of the transmissive and reflective film 20 can be set according to product requirements.

[0046] For example, as Figure 1 shown, the reflective polarizing layer 30 may be a polarization reflection film, and the reflective polarizing layer 30 is configured to reflect linearly polarized light of one characteristic and transmit linearly polarized light of another characteristic.

[0047] For example, as Figure 1 shown, the function of the reflective polarizing layer 30 is as follows: there is a light-transmitting axis direction in the plane of the film layer, and the transmittance of the polarization component (such as s linearly polarized light) of the incident light parallel to this light-transmitting axis direction is greater than that of the polarization component (such as p linearly polarized light) perpendicular to this light-transmitting axis direction, and the reflectivity of the polarization component (such as s linearly polarized light) parallel to this light-transmitting axis direction is less than that of the polarization component (such as p linearly polarized light) perpendicular to this light-transmitting axis direction. For example, the reflective polarizing layer 30 may also be referred to as a polarization beam splitting film. For example, the transmittance of the polarized light parallel to the light-transmitting axis direction of the reflective polarizing layer 30 is not less than 85%, such as not less than 90%, such as not less than 95%, such as not less than 98%; the reflectivity of the polarized light perpendicular to the light-transmitting axis direction of the reflective polarizing layer 30 is not less than 85%, such as not less than 90%, such as not less than 95%, such as not less than 98%.

[0048] For example, as Figure 1 shown, the phase retardation film 40 is configured to enable the transmitted light to achieve a conversion between a circular polarization state and a linear polarization state. For example, the phase retardation film 40 may be a quarter-wave plate. For example, the material of the phase retardation film 40 may include liquid crystal polymer or polycarbonate. For example, the phase retardation film 40 has the following characteristics: there is a direction with the lowest refractive index and a direction with the highest refractive index in the plane of the film layer, which are the fast axis and the slow axis respectively. The phase of the polarized light parallel to the slow axis is delayed by 1 / 4 wavelength after passing through the phase retardation film 40 compared with the polarized light parallel to the fast axis after passing through the phase retardation film 40.

[0049] For example, as Figure 1 shown, the included angle between the slow axis of the phase retardation film 40 and the light-transmitting axis of the reflective polarizing layer 30 is 45 degrees.

[0050] For example, asFigure 1 As shown, the light transmission axis of the linear polarizing film 50 coincides with the light transmission axis of the reflective polarizing layer 30, and the linear polarizing film 50 can be used to further filter other stray light, and only polarized light (such as s-linear polarized light) passing through the linear polarizing film 50 is allowed to enter the human eye. For example, the linear polarizing film 50 can adopt a three-layer laminated structure, the middle layer in the three-layer laminated structure can be polyvinyl alcohol (PVA) added with dichroic molecules, at least one layer on both sides of the middle layer in the three-layer laminated structure can be triacetate (TAC), and the total thickness of the three-layer laminated structure can be 40 to 200 microns.

[0051] like Figure 1 As shown, the display screen ( Figure 1 Not shown, reference Figure 9 The display screen 60 shown in the figure can be located on the side of the transflective film 20 away from the phase delay film 40. Light, such as light emitted from the display screen, is configured to be folded back between the transflective film 20 and the reflective polarizing layer 30 after being incident on the lens assembly 10 through the transflective film 20, and emitted from the reflective polarizing layer 30 to achieve an ultra-short focus folded light path (Pancake).

[0052] For example, Figure 1 As shown, the principle of the folded optical path is as follows: a wave plate can be set on the light-emitting side of the display screen, and the image light emitted from the display screen is converted into right-handed circularly polarized light after passing through the wave plate. The right-handed circularly polarized light is incident on the transflective film 20, and the polarization state of the right-handed circularly polarized light remains unchanged after passing through the transflective film 20. The right-handed circularly polarized light reaches the phase delay film 40, and the right-handed circularly polarized light incident on the phase delay film 40 is converted into p-linear polarized light. The p-linear polarized light is reflected back to the phase delay film 40 by the reflective polarization layer 30, and the first reflection occurs here. Then, the p-linear polarized light is converted into right-handed circularly polarized light after passing through the phase delay film 40, and the right-handed circularly polarized light reaches the transflective film 20 and is reflected at the transflective film 20, and the second reflection occurs here. Due to half-wave loss, the reflected light changes from right-handed circularly polarized light to left-handed circularly polarized light. The left-handed circularly polarized light is converted into s-linear polarized light through the phase delay film 40, and then the s-linear polarized light is transmitted through the reflective polarization layer 30 and the linear polarization film 50 and then emitted to the human eye.

[0053] The folded optical path can change the polarization state of the light propagating between the reflective polarizing layer 30 and the transflective film 20, thereby realizing the folding of the light, so that the original focal length of the optical structure is folded due to, for example, two reflections added by setting the reflective polarizing layer 30, the phase delay film 40 and the transflective film 20, thereby greatly compressing the space required between the human eye and the optical structure, thereby making the optical structure smaller and thinner.

[0054] like Figure 1As shown, an optical film material 340 is disposed between the first surface 110 of the first lens 100 and the second surface 210 of the second lens 200. The optical film material 340 includes at least one of a reflective polarization layer 30 and a phase retardation film 40. Figure 1 It is schematically shown that both the reflective polarization layer 30 and the phase retardation film 40 are located between the first surface 110 and the second surface 210, but it is not limited thereto. For example, only the phase retardation film 40 may be disposed between the first surface 110 and the second surface 210, and the reflective polarization layer 30 is located on the fourth surface 220 of the second lens 200; for example, only the reflective polarization layer 30 may be disposed between the first surface 110 and the second surface 210.

[0055] As Figure 1 and Figure 2 As shown, the lens assembly 10 includes an imaging area 11 and an assembly area 12 surrounding the imaging area 11. For example, the imaging area 11 refers to the area where light converges to form an image after passing through this area of the lens assembly. For example, the assembly area 12 is the area of the lens assembly that does not participate in optical imaging. For example, the assembly area 12 may completely surround the imaging area 11, or may only surround a part of the imaging area 11. For example, the assembly area 12 may be a continuous area or an intermittently arranged area, and the embodiments of the present disclosure do not limit this.

[0056] As Figure 1 As shown, the part of the lens assembly 10 located in the assembly area 12 includes a snap-fit structure 300. The snap-fit structure 300 includes a first snap-fit portion 310 located on the first lens 100 and a second snap-fit portion 320 located on the second lens 200. The first snap-fit portion 310 and the second snap-fit portion 320 are oppositely arranged and complementary in shape to position the first lens 100 and the second lens 200. For example, the snap-fit structure 300 may be completely located in the assembly area 12. For example, the first snap-fit portion 310 may include a snap-fit protrusion, and the second snap-fit portion 320 may include a snap-fit groove. The snap-fit protrusion and the snap-fit groove are snap-fitted to achieve the positioning function of the first lens 100 and the second lens 200. For example, the number of snap-fit protrusions included in the first snap-fit portion 310 is the same as the number of snap-fit grooves included in the second snap-fit portion 320, and they are arranged in one-to-one correspondence.

[0057] As Figure 1 As shown, the first snap-fit portion 310 includes a snap-fit surface 330, and the snap-fit surface 330 is a non-planar surface. For example, the snap-fit surface 330 may include the surface of the snap-fit protrusion of the first snap-fit portion 310. For example, the snap-fit surface 330 may only include multiple curved surfaces connected in sequence and does not include a planar surface.

[0058] As Figure 3As shown, the portion of the first surface 110 located in the imaging region 11 includes a first position 111 and a second position 112 that are farthest apart in a first direction parallel to the optical axis, and the second position 112 is located at the edge of the imaging region 11. For example, the portion of the first surface 110 located in the imaging region 11 is a concave surface. For example, the optical axis may be parallel to Figure 1 the Z direction shown, such as the Z direction being the first direction, such as the first lens 100 and the second lens 200 being arranged in the first direction. For example, the second position 112 may be a point located at the edge of the imaging region 11, or may be a line located at the edge of the imaging region 11, such as the contour line of the edge of the imaging region 11. For example, the first position 111 may be a point.

[0059] In some examples, such as Figure 2 and Figure 3 shown, the first position 111 is located in the central region of the imaging region 11, the second position 112 is located in the edge region of the imaging region 11, and the second position 112 surrounds the first position 111. The central region of the imaging region 11 described above may be a circular region with a smaller radius, and the first position 111 may be located at the center of the circular region or at other positions outside the center. For example, the edge region of the imaging region 11 may include the contour line and a region with a smaller size within the contour line. For example, a gap may be provided between the central region and the edge region. Of course, the embodiments of the present disclosure are not limited thereto, and at least one of the central region and the edge region may be a region with a larger area and the edge of the central region is connected to the edge of the edge region. Figure 1 Schematically shows that the first position 111 is located at the center of the imaging region 11, but is not limited thereto, and the first position 111 may also be located at other positions.

[0060] For example, as Figure 3 shown, the projections of the respective positions of the first surface 110 located in the imaging region 11 on the optical axis include a plurality of points, and these plurality of points form a line segment, and the first position 111 and the second position 112 are respectively the two endpoints of the line segment. Thus, the projections of the first position 111 and the second position 112 on the optical axis are the two points that are farthest apart. For example, the first position 111 is closer to the display screen than the second position 112 (in combination with Figure 3 and Figure 9 ).

[0061] Such as Figure 3As shown, the engaging surface 330 includes a third position 331 and a fourth position 332. The fourth position 332 is closer to the imaging area 11 than the third position 331. In the first direction, the third position 331 is closer to the first position 111 than the fourth position 332. For example, at least one of the third position 331 and the fourth position 332 can be a point, or at least one of the third position 331 and the fourth position 332 can be a line. For example, both the third position 331 and the fourth position 332 are located on a curved surface. For example, the cross-section of the curved surface where the third position 331 is located can be a partial arc of a circle, and the cross-section of the curved surface where the fourth position 332 is located can also be a partial arc of a circle. For example, the third position 331 can be a point or a line. For example, the fourth position 332 can be a point or a line.

[0062] For example, as Figure 3 shown, in the projections of the first position 111, the third position 331, and the fourth position 332 on the optical axis, the projection of the third position 331 is closer to the projection of the first position 111 than the projection of the fourth position 332. For example, the third position 331 is closer to the display screen (in combination with Figure 3 and Figure 9 ). For example, the fourth position 332 can be located on the engaging protrusion of the first engaging portion 310, and the third position 331 can be located between two adjacent engaging protrusions of the first engaging portion 310. For example, the fourth position 332 can be located at the vertex of the engaging protrusion.

[0063] As Figure 3 shown, the distance between the first position 111 and the second position 112 in the first direction is the first distance D1, the distance between the third position 331 and the first position 111 in the first direction is the second distance D2, and the ratio of the first distance D1 to the second distance D2 is 0.9 to 1.1. For example, the first distance D1 is equal to the second distance D2. For example, the straight line extending along the AA' direction can pass through the third position 331 and the second position 112.

[0064] The optical structure provided by the present disclosure can improve the stretching and fitting effect of the optical film on the first surface or the second surface by matching the first distance in the imaging area with the second distance in the assembly area, such as using an engaging structure with specific parameters to match the parameters of the first surface of the first lens of the lens assembly, so as to avoid problems such as detachment between the optical film and the lens surface and optical glue bubbles when the optical film is stretched to fit the lens (the first lens or the second lens). In addition, the engaging structure located in the assembly area can also position the optical film located between the first surface and the second surface to form circularly polarized light.

[0065] In some examples, as Figure 1As shown, the portions of the first surface 110 and the second surface 210 located in the imaging area 11 are both spherical or aspherical. Taking the portion of the first surface 110 of the first lens 100 located in the imaging area 11 as an aspherical surface and the optical film 340 being stretched and adhered to the first surface 110 as an example, the aspherical surface profile is represented by the following numerical formula:

[0066]

[0067] In the above formula, the height of the aspherical surface in the direction perpendicular to the optical axis is Y, and the distance between the vertex of the aspherical surface and the projection on the optical axis at the height Y on the aspherical surface is z, that is, z is the coordinate in the direction of the optical axis; C is the curvature (the reciprocal of the radius of curvature R), k is the conic coefficient (Conic Constant), α i is the coefficient of each high-order term, and 2i is the order of the aspherical coefficient of the aspherical surface.

[0068] The first distance D1 shown above can be calculated through the above formula, that is, the value of z. By adjusting the parameters such as the aspherical coefficient in the above formula and the size of the engaging structure 300 to satisfy the objective function: D1 - D2 = 0, it is ensured that the optical film 340 can be completely adhered to the first surface 110 with an aspherical surface profile in a curved surface laminating manner, while avoiding interference with the engaging structure 300, achieving the avoidance effect of curved surface lamination, avoiding interference with the engaging structure 300, and preventing problems such as detachment between the optical film 340 and the lens surface (such as detachment between the optical film 340 and the partial surface of the lens surface at the edge of the imaging area 11), optical glue bubbles, etc. Of course, the embodiments of the present disclosure are not limited to this. By adjusting the parameters of the first surface with a spherical surface profile and the size of the engaging structure so that the first distance D1 matches the second distance D2 (such as satisfying the above objective function: D1 - D2 = 0), a better lamination effect of the optical film 340 can also be achieved. Figure 3

[0069] Figures 2 to 3 In some examples, referring to , the third position 331 is located on at least one side of the imaging area 11 in the second direction perpendicular to the optical axis. The size of the imaging area 11 in the second direction is the imaging size S1. The minimum distance between the second position 112 and the nearest third position 331 in the second direction is the third distance D3. The ratio of the third distance D3 to the imaging size S1 is 0.01 to 0.05. For example, the ratio of the third distance D3 to the imaging size S1 is 0.02 to 0.03. For example, the ratio of the third distance D3 to the imaging size S1 is 0.025 to 0.04.

[0070] Figure 2 For example, as Figure 2As shown, the second direction may be the X direction. For example, the second direction is not limited to Figure 2 the X direction shown, but may also be a direction perpendicular to the optical axis and having a third position 331, such as the AA' line including two second directions.

[0071] In some examples, such as Figure 3 shown, the distance between the third position 331 and the fourth position 332 in the first direction is the fourth distance D4, and the ratio of the central thickness CT of the first lens 100 to the fourth distance D4 is 2 to 3.5. For example, the distance between the projections of the third position 331 and the fourth position 332 on the optical axis is the above-mentioned fourth distance D4. For example, the ratio of the central thickness CT of the first lens 100 to the fourth distance D4 is 2.5 to 3. For example, the ratio of the central thickness CT of the first lens 100 to the fourth distance D4 is 2.2 to 3.5. For example, the ratio of the central thickness CT of the first lens 100 to the fourth distance D4 is 2.8 to 3.7.

[0072] By adjusting the engaging structure and the aspherical or spherical surface shape parameters of the part of the first surface located in the imaging area so that the first distance matches the second distance, while setting the dimensional relationship between the third distance of the engaging structure and the imaging size of the part of the first surface located in the imaging area, and setting the dimensional relationship between the fourth distance of the engaging structure and the central thickness of the first lens, the curved surface fitting effect of the optical film on the first surface of the first lens can be further improved.

[0073] In some examples, such as Figure 3 shown, the fourth distance D4 is less than the first distance D1. For example, the first distance D1 may be greater than the central thickness CT of the first lens 100, may also be less than the central thickness of the first lens 100, or may be equal to the central thickness CT of the first lens 100, and can be set according to requirements.

[0074] In some examples, such as Figure 3 shown, the engaging surface 330 further includes a fifth position 333 located away from the imaging area 11 at the third position 331. In the first direction, the third position 331 is closer to the first position 111 than the fifth position 333. For example, among the projections of the first position 111, the third position 331, and the fifth position 333 on the optical axis, the distance between the projections of the first position 111 and the third position 331 is less than the distance between the projections of the first position 111 and the fifth position 333. For example, the fifth position 333 is farther from the display screen than the third position 331. For example, the fifth position 333 and the fourth position 332 may be respectively located on different engaging protrusions of the first engaging portion 310. For example, the fifth position 333 may be located at the vertex of the engaging protrusion. For example, the fifth position 333 may be a point or a line.

[0075] By setting the relative positional relationship of the third position, the fourth position, and the fifth position, it is beneficial to improve the fitting effect of the optical film on the curved surface of the lens, prevent the occurrence of incomplete fitting voids at the latching structure, such as bubbles, and further prevent the optical film from peeling off.

[0076] In some examples, such as Figure 3 shown, in the first direction, the distance between the third position 331 and the fourth position 332 is the fourth distance D4, the distance between the fifth position 333 and the third position 331 is the fifth distance, and the ratio of the fourth distance D4 to the fifth distance is 0.9 to 1.1. For example, the fourth distance D4 can be equal to the fifth distance. For example, the straight line extending along the AA' direction can pass through the fourth position 332 and the fifth position 333.

[0077] In some examples, referring to Figure 1 and Figure 3 , the edge of the optical film 340 is located at the second position 112. For example, the center of the optical film 340 is located at the first position 111. For example, the edge of the optical film 340 is flush with the edge of the imaging area 11. However, it is not limited to this, and the edge of the optical film can also cover a very small part of the size of the latching structure.

[0078] In some examples, such as Figure 1 shown, the orthographic projection of the optical film 340 on the plane perpendicular to the optical axis does not overlap with the orthographic projection of the latching structure 300 on this plane. For example, the orthographic projection of the optical film 340 on the plane perpendicular to the optical axis is completely located within the orthographic projection of the imaging area 11 on this surface. For example, the orthographic projection of the transmissive-reflective film 20 on this plane overlaps with the orthographic projection of the latching structure 300 on this plane. For example, the orthographic projection of the linear polarization film 50 on this plane overlaps with the orthographic projection of the latching structure 300 on this plane. Figure 1 Schematically shows that the orthographic projections of the transmissive-reflective film and the linear polarization film on the plane perpendicular to the optical axis both overlap with the latching structure, but it is not limited to this, and at least one of the transmissive-reflective film and the linear polarization film may not overlap with the orthographic projection of the latching structure on the plane perpendicular to the optical axis.

[0079] In some examples, such as Figure 2 and Figure 3As shown, the first engaging portion 310 includes a first sub-engaging portion 311, a second sub-engaging portion 312, and a third sub-engaging portion 313 that are arranged in sequence around the imaging region 11. In the orthographic projection of the first surface 110 on a plane perpendicular to the optical axis, the line connecting the center of the first surface 110 and the center of the first sub-engaging portion 311 is the first connection line L1, the line connecting the center of the first surface 110 and the center of the second sub-engaging portion 312 is the second connection line L2, and the line connecting the center of the first surface 110 and the center of the third sub-engaging portion 313 is the third connection line L3. The included angle between the first connection line L1 and the second connection line L2 is 135 degrees, the included angle between the second connection line L2 and the third connection line L3 is 90 degrees, and the included angle between the third connection line L3 and the first connection line L1 is 135 degrees.

[0080] For example, referring to Figure 1 and Figure 2 , the first sub-engaging portion 311 is configured to position the absorption axis of the reflective polarizing layer 30. For example, the central position of the first sub-engaging portion 311 is configured to position the absorption axis of the reflective polarizing layer 30; the second sub-engaging portion 312 and the third sub-engaging portion 313 are configured to position the fast axis and the slow axis of the phase retardation film 40. For example, the central positions of the second sub-engaging portion 312 and the third sub-engaging portion 313 are configured to position the fast axis and the slow axis of the phase retardation film 40.

[0081] The optical structure provided by the present disclosure realizes the alignment of optical films, such as the alignment of the reflective polarizing layer and the phase retardation film, by providing the first sub-engaging portion, the second sub-engaging portion, and the third sub-engaging portion, which is beneficial to improving the circular polarization effect of the emitted light, and further improving the polarization degree and optical clarity of the light emitted from the optical structure.

[0082] In some examples, such as Figure 2 and Figure 3As shown, the first sub-latching portion 311, the second sub-latching portion 312, and the third sub-latching portion 313 have the same shape. For example, the first sub-latching portion 311, the second sub-latching portion 312, and the third sub-latching portion 313 each include two latching protrusions and a latching groove located between the two latching protrusions. For example, the distances between the third positions 331 in the first sub-latching portion 311, the third positions 331 in the second sub-latching portion 312, and the third positions 331 in the third sub-latching portion 313 and the center of the first surface 110 in the first direction are substantially equal, and the distances between the fourth positions 332 in the first sub-latching portion 311, the fourth positions 332 in the second sub-latching portion 312, and the fourth positions 332 in the third sub-latching portion 313 and the center of the first surface 110 in the first direction are substantially equal. For example, the distances between the third position 331 and the fourth position 332 in the second direction in the first sub-latching portion 311, the distances between the third position 331 and the fourth position 332 in the second direction in the second sub-latching portion 312, and the distances between the third position 331 and the fourth position 332 in the second direction in the third sub-latching portion 313 are all equal. For example, the shapes and areas of the orthographic projections of the first sub-latching portion 311, the second sub-latching portion 312, and the third sub-latching portion 313 on a plane perpendicular to the optical axis are the same.

[0083] Figure 4 and Figure 5 are schematic diagrams of partial cross-sectional structures of a part of the optical structure shown along the line BB' in different examples. Figure 2 Only the lens assembly 10 and the optical film 340 are shown, and the transmissive-reflective film 20 and the linear polarizing film 50 are not shown. Figure 4 and Figure 5 The differences in the optical structures shown lie in the settings of the surface shapes between at least two of the first sub-latching portion 311, the second sub-latching portion 312, and the third sub-latching portion 313. Other identical structures may have the same features and will not be elaborated here. Figure 4 and Figure 5 The differences in the optical structures shown lie in the settings of the surface shapes between at least two of the first sub-latching portion 311, the second sub-latching portion 312, and the third sub-latching portion 313. Other identical structures may have the same features and will not be elaborated here.

[0084] In some examples, as Figure 2 and Figure 4As shown, the surface of the first lens 100 between at least two of the first sub-engaging portion 311, the second sub-engaging portion 312, and the third sub-engaging portion 313 includes a flat surface. For example, the portion of the first surface 110 between the first sub-engaging portion 311 and the second sub-engaging portion 312 is a flat surface, and the portion of the second surface 210 between the first sub-engaging portion 311 and the second sub-engaging portion 312 is a flat surface. For example, the portion of the first surface 110 between the first sub-engaging portion 311 and the third sub-engaging portion 313 is a flat surface, and the portion of the second surface 210 between the first sub-engaging portion 311 and the third sub-engaging portion 313 is a flat surface. For example, the portion of the first surface 110 between the second sub-engaging portion 312 and the third sub-engaging portion 313 is a flat surface, and the portion of the second surface 210 between the second sub-engaging portion 312 and the third sub-engaging portion 313 is a flat surface.

[0085] In the optical structure provided by the present disclosure, glue dots are provided at the flat surface positions of the first lens between at least two of the first sub-engaging portion, the second sub-engaging portion, and the third sub-engaging portion. After curing, the first lens and the second lens are fixed to complete the engaging alignment process.

[0086] For example, as Figure 2 and Figure 4 shown, the area of the positive projection of the flat surface between adjacent sub-engaging portions on a plane perpendicular to the optical axis of the lens assembly 10 can be greater than the area of the positive projection of any sub-engaging portion on this plane. For example, the above-mentioned flat surface and the sub-engaging portion together form an assembly area 12 surrounding the imaging area 11.

[0087] In some examples, as Figure 2 and Figure 5 shown, the surface of the first lens 100 between at least two of the first sub-engaging portion 311, the second sub-engaging portion 312, and the third sub-engaging portion 313 includes a groove 350. In the optical structure provided by the present disclosure, by providing a groove at a position outside the engaging structure, an overflow space is provided to prevent the glue bonding the first lens and the second lens from overflowing from the edge of the lens assembly.

[0088] For example, as Figure 2 and Figure 5 shown, there is one groove 350 provided between the first sub-engaging portion 311 and the second sub-engaging portion 312, but not limited thereto. Two or more grooves 350 can be provided between the first sub-engaging portion 311 and the second sub-engaging portion 312. For example, multiple grooves 350 can be provided around the imaging area 11. For example, one or more grooves 350 can also be provided between the first sub-engaging portion 311 and the third sub-engaging portion 313, and / or between the second sub-engaging portion 312 and the third sub-engaging portion 313.

[0089] Figure 6A cross-sectional view of an optical structure provided as another example according to an embodiment of the present disclosure. Figure 6 The optical structure shown is different from Figure 1 the optical structure shown in that the first sub-latching portion 311 includes a positioning member 314. Figure 6 The optical structure and Figures 1 to 5 the other structures of the optical structure shown except for the positioning member 314 may have the same features, which will not be elaborated herein.

[0090] In some examples, as Figure 6 shown, the first sub-latching portion 311 includes a positioning member 314. In the optical structure provided by the present disclosure, by providing a positioning member at the position of the first sub-latching portion, the optical structure can effectively limit the rotation angle of the display screen, making the two coaxial, and preventing the rotation angle of the optical structure from being mismatched with respect to the display screen, so as to improve the display effect of the display device including the optical structure and the display screen.

[0091] Of course, the embodiment of the present disclosure is not limited to the positioning member being located in the first sub-latching portion. Taking the connection line between the center of the first sub-latching portion and the orthographic projection of the center of the first lens on the plane perpendicular to the optical axis as 0 degrees as an example, the above-mentioned positioning member can also be provided at the position directly opposite to the center of the first sub-latching portion. The connection line between the orthographic projection of this position on the above-mentioned plane and the orthographic projection of the center of the first lens is 180 degrees.

[0092] Figure 7A and Figure 7B A partial cross-sectional structure schematic diagram of the first latching portion in other examples according to the embodiments provided by the present disclosure.

[0093] For example, Figure 7A the first latching portion 310 shown is different from Figure 1 the first latching portion 310 shown in that the latching surface 330 may further include a plane, such as the latching surface 330 includes a curved surface and a plane. For example, both sides of the third position 331 may be planes, and the third position 331 may be located at the included angle position of the two planes. For example, the fourth position 332 is located on the curved surface.

[0094] For example, Figure 7B the first latching portion 310 shown is different from Figure 1 the first latching portion 310 shown in that the latching surface 330 only includes a plurality of sequentially connected planes and does not include a curved surface. For example, both the first position 111 and the fourth position 332 are located on planes. For example, the plane where the third position 331 is located and the plane where the fourth position 332 is located may be parallel. For example, the included angle between the plane connecting the plane where the third position 331 is located and the plane where the fourth position 332 is located and the plane where the third position 331 is located is greater than 90 degrees. The embodiment of the present disclosure does not limit this, and the shape of the latching surface 330 can be set according to requirements.

[0095] Figure 8 Schematic diagram after stretching and attaching an optical film material onto a first lens of the optical structure shown in Figure 1 For example, as shown in

[0096] For example, as shown in Figure 8 When the optical film material 340 is stretched and attached onto the first surface 110 of the first lens 100, the edge of the optical film material 340 is located on the latching structure 300. For example, when the edge of the optical film material 340 is stretched to the third position 331 of the latching structure 300, the edge of the optical film material 340 is simultaneously attached to both the third position 331 and the fourth position 332, and the third position 331 is almost flush with the second position 112, which helps prevent problems such as detachment between the optical film material 340 and the latching structure 300 and the surface of the imaging region 11 close to the latching structure 300, and optical glue bubbles.

[0097] For example, referring to Figure 8 and Figure 1 , after the optical film material 340 is attached onto the first lens 100, the portion of the optical film material 340 located on the latching structure 300 is laser cut to meet the subsequent latching process between the first lens 100 and the second lens 200.

[0098] Figure 9 Partial structural schematic diagram of a display device provided according to another embodiment of the present disclosure.

[0099] As shown in Figure 9 , the display device includes a display screen 60 and any one of the above optical structures, and the display screen 60 is located on the side of the transmissive-reflective film 20 away from the reflective polarizing layer 40.

[0100] For example, as shown in Figure 9 , the first lens 100 is located between the second lens 200 and the display screen 60.

[0101] For example, as shown in Figure 9 , the display surface of the display screen 60 is located at the focal plane on the light incident side of the optical structure.

[0102] For example, as shown in Figure 9As shown, the display screen 60 may further include a plurality of sub-pixels (not shown) and a microlens array (not shown) located on the light-emitting side of the plurality of sub-pixels. For example, the microlens array includes a plurality of microlenses, and the microlens may be a spherical lens or an aspherical lens. For example, the surface curvature radius of each microlens may be the same, but at least some of the microlenses may be eccentric microlenses. For example, the vertex of the convex surface deviates from the center of the corresponding sub-pixel, and the angles between the optical axes of different microlenses and the normal line of the light-emitting surface of the display screen are different, so that the light intensity of the light emitted by the sub-pixels is redistributed after passing through the microlenses, and the maximum value of the light intensity is made consistent with the principal ray direction of different fields of view in the optical structure.

[0103] For example, such as Figure 9 As shown, the display screen 60 may be a silicon-based organic light-emitting diode display screen with an extremely high pixel density. The optical structure has the performance of high definition and a large field of view. The spot size of the optical structure in the central field of view is less than the size of one sub-pixel (micrometer level), and the full field of view can exceed 100 degrees.

[0104] For example, such as Figure 9 As shown, the display screen 60 may be any type of display screen, such as a liquid crystal display screen, an inorganic light-emitting diode display screen, a quantum dot display screen, a projector (such as an LCOS micro-projector), etc.

[0105] For example, the display device may be a virtual reality (VR) display device. For example, the virtual reality display device may be a display device using an ultra-short focal length folding optical path.

[0106] For example, the display device may be a near-eye display device, and the near-eye display device may be a wearable VR helmet, VR glasses, etc., and the embodiments of the present disclosure are not limited thereto.

[0107] The following points need to be noted:

[0108] (1) In the accompanying drawings of the embodiments of the present disclosure, only the structures related to the embodiments of the present disclosure are involved, and other structures may refer to the general design.

[0109] (2) Without conflict, the features in the same embodiment and different embodiments of the present disclosure may be combined with each other.

[0110] The above description is only an exemplary implementation manner of the present disclosure, rather than used to limit the protection scope of the present disclosure. The protection scope of the present disclosure is determined by the appended claims.

Claims

1. An optical structure, comprising: A lens assembly, at least including a first lens and a second lens. The surface of the first lens facing the second lens is a first surface, and the surface of the second lens facing the first lens is a second surface. Both the first surface and the second surface are curved surfaces; A transmissive and reflective film, located on the side of the first lens away from the second lens or on the side of the second lens away from the first lens; A reflective polarizing layer; A phase retardation film, located on the side of the transmissive and reflective film facing the reflective polarizing layer, wherein, an optical film material is disposed between the first surface and the second surface, and the optical film material includes at least one of the reflective polarizing layer and the phase retardation film; The lens assembly includes an imaging area and an assembly area surrounding the imaging area. The part of the lens assembly located in the assembly area includes a snap-fit structure. The snap-fit structure includes a first snap-fit portion located on the first lens and a second snap-fit portion located on the second lens. The first snap-fit portion and the second snap-fit portion are oppositely arranged and complementary in shape to position the first lens and the second lens. The first snap-fit portion includes a snap-fit surface, and the snap-fit surface is a non-planar surface; The part of the first surface located in the imaging area includes a first position and a second position that are the farthest apart in a first direction parallel to the optical axis of the lens assembly. The second position is located at the edge of the imaging area. The snap-fit surface includes a third position and a fourth position. The fourth position is closer to the imaging area than the third position. In the first direction, the third position is closer to the first position than the fourth position. The distance between the first position and the second position in the first direction is a first distance, the distance between the third position and the first position in the first direction is a second distance, and the ratio of the first distance to the second distance is 0.9 to 1.

1.

2. The optical structure according to claim 1, wherein, The third position is located on at least one side of the imaging area in a second direction perpendicular to the optical axis. The size of the imaging area in the second direction is an imaging size. The minimum distance between the second position and the nearest third position in the second direction is a third distance, and the ratio of the third distance to the imaging size is 0.01 to 0.

05.

3. The optical structure according to claim 1, wherein, The distance between the third position and the fourth position in the first direction is a fourth distance, and the ratio of the central thickness of the first lens to the fourth distance is 2 to 3.

5.

4. The optical structure according to claim 1, wherein, The first engaging portion includes a first sub-engaging portion, a second sub-engaging portion, and a third sub-engaging portion that are arranged in sequence around the imaging area. In the orthographic projection of the first surface on a plane perpendicular to the optical axis, the line connecting the center of the first surface and the center of the first sub-engaging portion is the first line, the line connecting the center and the center of the second sub-engaging portion is the second line, and the line connecting the center and the center of the third sub-engaging portion is the third line. The angle between the first line and the second line is 135 degrees, the angle between the second line and the third line is 90 degrees, and the angle between the third line and the first line is 135 degrees.

5. The optical structure according to claim 3, wherein, The fourth distance is less than the first distance.

6. The optical structure according to claim 1, wherein, The engaging surface further includes a fifth position away from the imaging area at the third position. In the first direction, the third position is closer to the first position than the fifth position.

7. The optical structure according to claim 6, wherein, In the first direction, the distance between the third position and the fourth position is the fourth distance, the distance between the fifth position and the third position is the fifth distance, and the ratio of the fourth distance to the fifth distance is 0.9 to 1.

1.

8. The optical structure according to claim 4, wherein, The first sub-engaging portion, the second sub-engaging portion, and the third sub-engaging portion have the same shape.

9. The optical structure according to claim 4 or 8, wherein, The surface of the first lens between at least two of the first sub-engaging portion, the second sub-engaging portion, and the third sub-engaging portion includes a plane.

10. The optical structure according to claim 4 or 8, wherein, The surface of the first lens between at least two of the first sub-engaging portion, the second sub-engaging portion, and the third sub-engaging portion includes a groove.

11. The optical structure according to claim 4 or 8, wherein, The first sub-engaging portion includes a positioning member.

12. The optical structure according to any one of claims 1-8, wherein, The edge of the optical film material is located at the second position.

13. The optical structure according to any one of claims 1-8, wherein, The orthographic projection of the optical film material on a plane perpendicular to the optical axis of the lens assembly does not overlap with the orthographic projection of the engaging structure on the plane.

14. The optical structure according to any one of claims 1-8, wherein, The first position is located in the central area of the imaging area, the second position is located in the edge area of the imaging area, and the second position surrounds the first position.

15. The optical structure according to any one of claims 1-8, wherein, The portions of the first surface and the second surface located in the imaging area are both spherical or aspherical.

16. The optical structure according to any one of claims 1-8, wherein, The second surface has a complementary surface shape to the first surface.

17. The optical structure according to any one of claims 1-8 further includes: A linear polarizing film located on the side of the reflective polarizing layer away from the transmissive-reflective film.

18. A display device, comprising a display screen and the optical structure according to any one of claims 1-17, wherein, The display screen is located on the side of the transmissive-reflective film away from the reflective polarizing layer.

Images