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 located on the lens assembly, a polarization reflection film and a phase delay film. The lens assembly comprises at least two plane diffraction lenses, each plane diffraction lens comprises a flat plate body and a plane diffraction structure, each plane diffraction structure comprises a plurality of protrusions forming preset patterns, the preset patterns of different plane diffraction structures are different, and the plane diffraction structures are located between the polarization reflection film and the transflective film; the size of the protrusions in the direction perpendicular to the flat plate body is a first size, the maximum size of the protrusions in the direction parallel to the flat plate body is a second size, and in the at least one plane diffraction lens, at least one of the first size and the second size of at least two protrusions is different. The plane diffraction structure is located between the transflective film and the polarization reflection film, and at least one of the first size and the second size of the at least two protrusions is different, so that the size and the weight of the optical structure can be reduced while the optical imaging quality is improved.

Description

Technical Field

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

[0002] Currently, virtual reality (VR) devices include glasses that utilize an ultra-short-throw folded optical path (Pancake). These glasses consist of two or more lenses. Light from an image source is repeatedly folded back and forth between a transflective film and a polarizing film in the folded optical path, ultimately exiting through the polarizing film and reaching the eye. This folded optical path significantly reduces the required distance between the near-eye display device and the human eye, significantly reducing the size of the VR device. Summary of the Invention

[0003] Embodiments of the present disclosure provide an optical structure and a display device.

[0004] The present disclosure provides an optical structure comprising: a lens assembly, a transflective film, a polarizing reflective film, and a phase delay film. The lens assembly comprises at least two planar diffraction lenses arranged in a stacked arrangement; the transflective film is located on the lens surface of the lens assembly; the polarizing reflective film is located on the lens surface of the lens assembly; and the phase delay film is located on the side of the transflective film facing the polarizing reflective film. The planar diffraction lens comprises a flat plate body and a planar diffraction structure distributed on the flat plate body. The planar diffraction structure comprises a plurality of protrusions forming a preset pattern, with different planar diffraction structures having different preset patterns. The planar diffraction structure is located between the polarizing reflective film and the transflective film. The size of the protrusion in a direction perpendicular to the flat plate body is a first size, and the maximum size of the protrusion in a direction parallel to the flat plate body is a second size. In at least one planar diffraction lens, at least one of the first size and the second size of at least two protrusions is different.

[0005] For example, according to an embodiment of the present disclosure, in each planar diffractive lens, at least one of the first size and the second size of at least two protrusions is different.

[0006] For example, according to an embodiment of the present disclosure, the lens assembly includes a first lens surface, which is the surface of the light-entering side of the lens assembly, the transflective film is located on the first lens surface, and the side surface of the transflective film away from the first lens surface is a plane.

[0007] For example, according to an embodiment of the present disclosure, each planar diffraction lens includes the flat body and the planar diffraction structure, the thickness of the flat body is 0.1 to 2 mm, the first dimension is 50 to 5000 nanometers, the second dimension is 10 to 2000 nanometers, and the interval between adjacent protrusions is 10 to 2000 nanometers.

[0008] For example, according to an embodiment of the present disclosure, in the at least one planar diffractive lens, the multiple protrusions are distributed in a multi-circle ring shape; the orthographic projection of each protrusion on the flat body is symmetrically distributed relative to a straight line extending along a first direction and a second direction, and the first direction is perpendicular to the second direction.

[0009] For example, according to an embodiment of the present disclosure, the at least two plane diffraction lenses include at least a first plane diffraction lens and a second plane diffraction lens, the preset pattern of the first plane diffraction lens includes at least a first preset pattern area, the preset pattern of the second plane diffraction lens includes at least a second preset pattern area, the orthographic projection of the first preset pattern area on a plane parallel to the flat body and the orthographic projection of the second preset pattern area on the plane coincide with each other, and at least one of the first size and the second size of at least one protrusion in the first preset pattern area and at least one protrusion in the second preset pattern area are different.

[0010] For example, according to an embodiment of the present disclosure, one of the first plane diffraction lens and the second plane diffraction lens is configured to converge light, and the other of the first plane diffraction lens and the second plane diffraction lens is configured to diverge light.

[0011] For example, according to an embodiment of the present disclosure, the multiple protrusions in the first planar diffractive lens and the multiple protrusions in the second planar diffractive lens are opposite to each other and are spaced apart.

[0012] For example, according to an embodiment of the present disclosure, the transflective film is located on the first flat surface of the flat body of the first plane diffraction lens away from the multiple protrusions, and the polarized reflective film is located on the second flat surface of the flat body of the second plane diffraction lens away from the multiple protrusions; the phase delay film is located between the first plane diffraction lens and the second plane diffraction lens, or the phase delay film is located on the side of the second flat surface away from the first plane diffraction lens.

[0013] For example, according to an embodiment of the present disclosure, the lens assembly includes a second lens surface, the second lens surface includes the multiple raised surfaces and one of the surfaces of the flat body, the phase delay film is located on the second lens surface, and the side surface of the phase delay film away from the second lens surface is a plane.

[0014] For example, according to an embodiment of the present disclosure, the lens assembly includes a third lens surface, the third lens surface includes the multiple raised surfaces and one of the surfaces of the flat body, the polarizing reflective film is located on the third lens surface, and the side surface of the polarizing reflective film away from the third lens surface is a plane.

[0015] For example, according to an embodiment of the present disclosure, the lens assembly includes multiple lenses, and the same lens includes at most one planar diffraction structure.

[0016] For example, according to an embodiment of the present disclosure, in at least one planar diffractive lens, the flat plate body and the plurality of protrusions are an integrated structure.

[0017] For example, according to an embodiment of the present disclosure, the dimension of the lens assembly in a direction perpendicular to the flat plate body is no greater than 10 mm.

[0018] For example, according to an embodiment of the present disclosure, the optical structure further includes: a linear polarization film located on a side of the polarization reflective film away from the phase delay film.

[0019] For example, according to an embodiment of the present disclosure, the material of the planar diffraction lens includes at least one of quartz glass, single crystal silicon, silicon oxide, and titanium oxide.

[0020] Another embodiment of the present disclosure provides a display device, comprising a display screen and any one of the above optical structures, wherein the display screen is located on a side of the transflective film away from the polarizing reflective film.

[0021] In the optical structure and display device provided by the present disclosure, the lens assembly includes at least two planar diffraction structures located between a transflective film and a polarized reflective film, and at least one of the first size and the second size of at least two protrusions in at least one planar diffraction structure is different, so that a planar diffraction lens can replace a lens with a curved surface. This not only reduces the process problems caused by curved surface film application, but also avoids aberration problems such as chromatic aberration, spherical aberration, and coma that affect the clarity of optical imaging, thereby increasing design freedom and improving the optical imaging quality while reducing the volume and weight of the optical structure. 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, rather than limiting the present disclosure.

[0023] Figure 1 It is a folded optical path imaging structure used in the field of virtual reality (VR).

[0024] Figure 2 A schematic diagram of a partial cross-sectional structure of an optical structure provided according to an example of an embodiment of the present disclosure.

[0025] Figure 3 for Figure 2 Schematic diagram of the folded light path of the optical structure shown.

[0026] Figure 4 A schematic diagram of a partial cross-sectional structure of an optical structure provided according to another example of an embodiment of the present disclosure.

[0027] Figure 5 and Figure 6 Schematic diagram of a partial cross-sectional structure of an optical structure provided according to different examples of the present disclosure.

[0028] Figure 7 for Figure 2 Schematic diagram of the planar structure of the first plane diffraction lens shown.

[0029] Figure 8 Schematic diagram of a partial cross-sectional structure of a display device provided according to another embodiment of the present disclosure. DETAILED DESCRIPTION

[0030] To make the purpose, technical solutions, and advantages of the embodiments of the present disclosure more clear, the technical solutions of the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings of 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 described embodiments of 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.

[0031] Unless otherwise defined, technical or scientific terms used in this disclosure should have the ordinary meanings understood by people with ordinary skills in the field to which this disclosure belongs. The words "first", "second" and similar terms used in this disclosure do not indicate any order, quantity or importance, but are simply used to distinguish different components. The words "include" or "comprising" and similar terms mean that the elements or objects preceding the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects.

[0032] The features such as “parallel”, “perpendicular” and “same” used in the embodiments of the present disclosure include the features such as “parallel”, “perpendicular” and “same” in the strict sense, as well as the cases where “approximately parallel”, “approximately perpendicular” and “approximately the same” contain certain errors, taking into account the errors associated with the measurement and the measurement of specific quantities (for example, the limitations of the measurement system), and are expressed as being within the acceptable deviation range for a specific value determined by a person of ordinary skill in the art. For example, “approximately” can mean within one or more standard deviations, or within 10% or 5% of the value. When the number of a component is not specifically indicated below in 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” refers to one or more, and “a plurality” refers to at least two.

[0033] Figure 1It is a folded optical path imaging structure used in the field of virtual reality (VR). Figure 1 As shown, the folded optical path system includes two or more lenses, such as lens 02 and lens 04. The light-incident side of lens 02 is provided with a transflective film 01, and the light-exiting side of lens 04 is provided with a polarizing reflective film 05. A phase retarder film 03 and an air gap or optical adhesive are provided between lenses 02 and 04. An image source (not shown) is provided on the side of transflective film 01 away from lens 02. Light emitted by the image source passes through transflective film 01 and enters the lens. After multiple reflections between transflective film 01 and polarizing reflective film 05, it exits through polarizing reflective film 05. This folded optical path imaging structure can change the polarization state of light propagating between the polarizing reflective film and the transflective film, achieving light folding. This folds the original focal length of the imaging structure due to the additional two reflections, such as the addition of the polarizing reflective film, phase retarder film, and transflective film. This significantly reduces the space required between the human eye and the imaging structure, making the imaging structure smaller and thinner.

[0034] like Figure 1 As shown, at least one of lens 02 and lens 04 utilizes an aspheric lens. While utilizing traditional geometric optical principles, these lenses are matched, bonded, or assembled according to different lens surface shapes and materials to achieve an imaging structure with low chromatic and spherical aberration. For example, by optimizing the lens' curved shape, such as designing lens parameters such as focal length and aperture, and combining and bonding the aspheric lenses according to specific requirements, an imaging structure utilizing aspheric lenses can effectively eliminate or reduce spherical and chromatic aberrations, improving the quality and clarity of optical imaging and achieving more accurate imaging.

[0035] During the research, the inventors of the present application found that: Figure 1 The folded optical path imaging structure shown in the figure has a lighter weight and better optical display effect than the Fresnel imaging structure. However, in order to meet higher display resolution, the imaging structure needs to use a multi-lens glued together to improve spherical aberration and other aberrations to improve imaging quality. However, as the number of lenses increases, the weight of the imaging structure will increase and the volume will increase. Figure 1 The thickness D1 of the imaging structure shown is greater than 9 mm. Figure 1 The imaging structure of the lens including the curved surface shown has better imaging quality, but when the film-laminating process is performed on the curved surface of the lens, the curved surface film-laminating process is more difficult, and wrinkles and warping are prone to occur at the edge of the film. For example, after the transflective film is attached to the curved surface of the lens, it will affect the elliptical polarization degree of the light entering the lens, and ghost images are likely to occur.

[0036] In addition, the inventors of the present application have also discovered that although the difficulty of applying a general flat film is lower than that of applying a curved film, it will sacrifice some optical performance and imaging quality.

[0037] The embodiments of the present disclosure provide an optical structure and a display device. The optical structure includes: a lens assembly, a transflective film, a polarized reflective film, and a phase delay film. The lens assembly includes at least two plane diffraction lenses arranged in a stacked manner; the transflective film is located on the lens surface of the lens assembly; the polarized reflective film is located on the lens surface of the lens assembly; and the phase delay film is located on the side of the transflective film facing the polarized reflective film. The plane diffraction lens includes a flat plate body and a plane diffraction structure distributed on the flat plate body. The plane diffraction structure includes a plurality of protrusions forming a preset pattern. Different plane diffraction structures have different preset patterns. The plane diffraction structure is located between the polarized reflective film and the transflective film. The size of the protrusion in a direction perpendicular to the flat plate body is a first size, and the maximum size of the protrusion in a direction parallel to the flat plate body is a second size. In at least one plane diffraction lens, at least one of the first size and the second size of at least two protrusions is different.

[0038] In the optical structure provided by the present disclosure, the lens assembly includes at least two planar diffraction structures located between a transflective film and a polarized reflective film, and at least one of the first size and the second size of at least two protrusions in at least one planar diffraction structure is different, so as to realize that the planar diffraction lens replaces the lens with a curved surface. This can not only reduce the process problems caused by the curved surface film, but also avoid aberration problems such as chromatic aberration, spherical aberration and coma that affect the clarity of optical imaging, thereby increasing the degree of design freedom, and improving the optical imaging quality while reducing the volume and weight of the optical structure.

[0039] The optical structure and display device provided by the embodiments of the present disclosure are described below with reference to the accompanying drawings.

[0040] Figure 2 A schematic diagram of a partial cross-sectional structure of an optical structure provided according to an example of an embodiment of the present disclosure.

[0041] like Figure 2 As shown, the optical structure includes a lens assembly 10, a transflective film 20 located on the lens assembly 10, a polarizing reflective film 30, and a phase retarder film 40. The phase retarder film 40 is located on the side of the transflective film 20 facing the polarizing reflective film 30. For example, depending on the material selected for the polarizing reflective film 30, the relative positions of the transflective film 20, the polarizing reflective film 30, and the phase retarder film 40 may vary. For example, the phase retarder film 40 may be located between the transflective film 20 and the polarizing reflective film 30, or the phase retarder film 40 may be located on the side of the polarizing reflective film 30 away from the transflective film 20. Figure 2 The phase retardation film 40 is schematically shown to be located between the transflective film 20 and the polarizing reflective film 30 .

[0042] like Figure 2As shown, the lens assembly 10 includes at least two stacked planar diffractive lenses 100. Each planar diffractive lens 100 includes a planar diffractive structure 10-1 located between the polarizing reflective film 30 and the transflective film 20. The planar diffractive structure 10-1 includes a plurality of protrusions 101 forming a predetermined pattern. The predetermined patterns vary between different planar diffractive lenses 100. For example, the planar diffractive structure 10-1 diffracts light, for example, by changing the phase of light passing through it to adjust the deflection angle of light of different wavelength bands.

[0043] Figure 3 for Figure 2 Schematic diagram of the folded light path of the optical structure shown.

[0044] For example, Figure 3 As shown, the optical structure utilizes an ultra-short-throw folded optical path (Pancake). Light incident on the optical structure travels back and forth between the transflective film 20 and the polarizing reflective film 30 to achieve a folded optical path. For example, light traveling back and forth between the transflective film 20 and the polarizing reflective film 30 is diffracted by the planar diffractive lens 100. Planar diffractive lenses 100 with different preset patterns diffract light of different wavelengths, for example, by altering the phase of light of different wavelengths to adjust the deflection angle of light of different wavelengths. Consequently, the lens assembly 10 composed of multiple planar diffractive lenses 100 can diffract light in the visible light band.

[0045] For example, Figure 3 As shown, the principle of folding the light path is as follows: the display screen located on the side of the transflective film 20 away from the lens assembly 10 (reference Figure 8A polarizer, such as a wave plate, can be installed on the light-emitting side of the display screen 70 (shown). Image light emitted from the display screen passes through the polarizer and is converted into right-handed circularly polarized light (or left-handed circularly polarized light). The right-handed circularly polarized light remains in its polarization state after passing through the transflective film 20. This right-handed circularly polarized light passes through the predetermined pattern of the plane diffraction lens 100 in the lens assembly 10 and reaches the phase retarder film 40, which modifies the wavefront phase of the light. The right-handed circularly polarized light incident on the phase retarder film 40 is converted into p-linearly polarized light. This p-linearly polarized light is reflected by the polarizing reflective film 30, undergoing a first reflection. During its reflection back to the phase retarder film 40, this polarized light again passes through the predetermined pattern of the plane diffraction lens 100, undergoing diffraction. The p-linearly polarized light then passes through the phase retarder film 40 and is converted into right-handed circularly polarized light. This right-handed circularly polarized light is then reflected by the transflective film 20, undergoing a second reflection. 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 reaches the phase delay film 40, and is converted into s-linearly polarized light through the phase delay film 40. In this process, the left-handed circularly polarized light or s-linearly polarized light is diffracted by the plane diffraction lens for the third time, and then the s-linearly polarized light is transmitted through the polarizing reflective film 30 and emitted to the human eye.

[0046] For example, Figure 2 and Figure 3 As shown, the transflective film 20 is configured to transmit a portion of light and reflect another portion of light. For example, the transflective 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 transflective film 20 may be 50%, and the reflectivity may be 50%. For example, the transmittance of the transflective film 20 may be 60%, and the reflectivity may be 40%. For example, the transmittance of the transflective film 20 may be 65%, and the reflectivity may be 35%. The optical structure provided in the present disclosure is not limited to this, and the transmittance and reflectivity of the transflective film 20 can be set according to product requirements.

[0047] For example, Figure 2 and Figure 3 As shown, the polarizing reflective film 30 is configured to reflect linearly polarized light of one characteristic and transmit linearly polarized light of another characteristic.

[0048] For example, Figure 2 and Figure 3As shown, the polarizing reflective film 30 functions as follows: a transmission axis exists within the film plane, and the transmittance of the polarization component of the incident light parallel to the transmission axis (e.g., s-polarized light) is greater than the transmittance of the polarization component perpendicular to the transmission axis (e.g., p-polarized light), and the reflectivity of the polarization component parallel to the transmission axis (e.g., s-polarized light) is less than the reflectivity of the polarization component perpendicular to the transmission axis (e.g., p-polarized light). For example, the polarizing reflective film 30 can also be referred to as a polarizing beam splitter film. For example, the transmittance of polarized light parallel to the transmission axis of the polarizing reflective film 30 is not less than 85%, such as not less than 90%, such as not less than 95%, such as not less than 98%; and the reflectivity of polarized light perpendicular to the transmission axis of the polarizing reflective film 30 is not less than 85%, such as not less than 90%, such as not less than 95%, such as not less than 98%. For example, the polarizing reflective film 30 can include a multilayer reflective polarizing film, a wire grid polarizer (WGF), etc.

[0049] For example, Figure 2 and Figure 3 As shown, the phase delay film 40 is configured to enable the transmitted light to convert between a circular polarization state and a linear polarization state. For example, the phase delay film 40 can be a 1 / 4 wave plate. For example, the material of the phase delay film 40 can include liquid crystal polymer or polycarbonate. For example, the phase delay 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 after passing through the phase delay film 40 is delayed by 1 / 4 wavelength compared with the polarized light parallel to the fast axis after passing through the phase delay film 40.

[0050] For example, Figure 2 and Figure 3 As shown, the angle between the slow axis of the phase retardation film 40 and the transmission axis of the polarizing reflection film 30 is 45 degrees.

[0051] In some examples, such as Figure 2 and Figure 3 As shown, the optical structure further includes a linear polarization film 50 located on a side of the polarization reflective film 30 away from the phase delay film 40 .

[0052] For example, Figure 3 As shown, the transmission axis of the linear polarizing film 50 coincides with the transmission axis of the polarizing reflective film 30 . The linear polarizing film 50 can be used to further filter other stray light and only allow polarized light (such as s-polarized light) passing through the linear polarizing film 50 to enter the human eye.

[0053] Figure 2 Two planar diffractive lenses 100 are schematically shown, but the present invention is not limited thereto and may also include three planar diffractive lenses 100 or more planar diffractive lenses 100. For example, a plurality of planar diffractive lenses 100 are stacked and arranged along the X direction.

[0054] like Figure 2 As shown, at least two planar diffractive lenses 100 further include a flat plate body 102 , and a plurality of protrusions 101 are distributed on the flat plate body 102 . For example, each planar diffractive lens 100 includes a flat plate body 102 and a plurality of protrusions 101 disposed on the flat plate body 102 .

[0055] In some examples, such as Figure 2 As shown, in at least one planar diffractive lens 100, the flat plate body 102 and the plurality of protrusions 101 are integrally configured. By integrating the flat plate body 102 and the plurality of protrusions 101, the production of the planar diffractive lens 100 can be facilitated. For example, the flat plate bodies 102 included in different planar diffractive lenses 100 can be independent structures or integrally configured. For example, in at least one planar diffractive lens 100, grooves can be included between any two adjacent protrusions 101. The bottom surfaces of the grooves can lie on the same plane, which can be the boundary between the protrusions 101 and the flat plate body 102, such as the surface of the flat plate body 102. For example, the flat plate body 102 can be plate-shaped, with all surfaces of the flat plate body 102 being flat.

[0056] like Figure 2 As shown, the dimension of the protrusion 101 in a direction perpendicular to the flat plate body 102 is a first dimension S1, and the maximum dimension of the protrusion 101 in a direction parallel to the flat plate body 102 is a second dimension S2. In at least one planar diffractive lens 100, at least one of the first dimension S1 and the second dimension S2 of at least two protrusions 101 is different. The direction perpendicular to the flat plate body 102 can be a direction perpendicular to the main surface of the flat plate body 102, for example, the direction perpendicular to the flat plate body 102 can be a thickness direction of the flat plate body 102, for example, Figure 2 The direction parallel to the flat panel body 102 can be Figure 2 The Y direction is shown, but not limited thereto, and can be any direction perpendicular to the X direction.

[0057] For example, Figure 2 In the example shown, in the same planar diffractive lens 100, the first size S1 of at least two protrusions 101 is different. For example, the first size S1 of the protrusion 101 can also be called the height of the protrusion 101. However, this is not limited to this. For example, in other examples, referring to Figure 5 In the same plane diffractive lens 100, the second sizes of at least two protrusions 101 are different, or, referring to Figure 6 In the same planar diffractive lens 100 , the first size and the second size of at least two protrusions 101 are different.

[0058] The optical structure provided herein comprises a lens assembly comprising at least two planar diffractive lenses positioned between a transflective film and a polarizing reflective film. At least one of the first and second dimensions of at least two protrusions in at least one of the planar diffractive lenses differs, thereby reducing the volume and weight of the optical structure without sacrificing optical imaging quality. The optical structure provided herein utilizes planar diffractive lenses in place of lenses with curved surfaces, reducing process issues associated with curved surface coatings and avoiding aberrations such as chromatic aberration, spherical aberration, and coma that can affect optical imaging clarity, thereby increasing design freedom.

[0059] It should be noted that the preset pattern formed by the aforementioned multiple protrusions includes a three-dimensional pattern formed by the orthographic projections of the multiple protrusions on the flat plate body, combined with the characteristics of the multiple protrusions having the same or different first dimensions in a direction perpendicular to the flat plate body. For example, the aforementioned "different preset patterns for different planar diffractive lenses" may include different two-dimensional patterns formed by the orthographic projections of the protrusions on the flat plate body in different planar diffractive lenses, and / or different first dimensions of the protrusions in different planar diffractive lenses with overlapping orthographic projections in at least a portion of the overlapping region of the orthographic projections on a plane parallel to the flat plate body.

[0060] In some examples, such as Figure 2 As shown, in each planar diffractive lens 100, at least one of the first and second sizes of at least two protrusions 101 differ. By setting different preset patterns for different planar diffractive lenses 100 and setting at least one of the first and second sizes of at least two protrusions 101 on each planar diffractive lens 100 to differ, the phases of light rays passing through protrusions 101 of different first and / or second sizes can be made different, so that light rays passing through the same planar diffractive lens 100 meet a desired phase distribution. For example, different planar diffractive lenses 100 can be configured to adjust the phases of light rays in different wavelength bands, such as the 400-800 nm wavelength band, thereby enabling the lens assembly 10 composed of multiple planar diffractive lenses 100 to modulate light rays in the visible light band, and even in a wider wavelength band, such as infrared and ultraviolet bands, beyond the visible light band.

[0061] For example, in other examples, in at least one planar diffractive lens, the first size and the second size of different protrusions are the same, and the at least one planar diffractive lens can correct chromatic aberration.

[0062] In some examples, such as Figure 2As shown, the lens assembly 10 includes a first lens surface 201, which is the surface on the light-incident side of the lens assembly 10. For example, image light emitted by the display screen passes through the first lens surface 201 and enters the lens assembly 10. A transflective film 20 is located on the first lens surface 201, and the surface of the transflective film 20 away from the first lens surface 201 is flat. For example, the transflective film 20 may be coated or laminated to the first lens surface 201. For example, the first lens surface 201 may be the surface of the protrusion 101, or it may be a flat surface of the tablet body 102 away from the protrusion 101. For example, the transflective film 20 is located on the flat surface of the tablet body 102. For example, the thickness of the transflective film 20 is greater than the first dimension of the protrusion 101, and the transflective film 20 may be located on the surface of the protrusion 101.

[0063] The optical structure provided by the present disclosure, by setting a transflective film on the surface of the first lens, can not only achieve nearly flat film bonding and avoid process problems caused by curved film bonding, such as edge wrinkles or warping, but also solve the ghosting problem that occurs when light emitted from the display screen forms a folded light path after passing through the transflective film of the curved film.

[0064] In some examples, such as Figure 2 As shown, each planar diffractive lens 100 includes a flat plate body 102. The thickness S3 of the flat plate body 102 is 0.1 to 2 mm. The first dimension S1 is 50 to 5000 nanometers, the second dimension S2 is 10 to 2000 nanometers, and the spacing between adjacent protrusions 101 is 10 to 2000 nanometers. By adjusting the numerical ranges for the second dimension of the protrusions 101 and the spacing between adjacent protrusions 101, the visible light diffraction range can be met.

[0065] For example, Figure 2 As shown, the thickness of the flat plate body 102 is greater than the height of the protrusions 101, such as the first dimension. For example, the ratio of the second dimension to the spacing between adjacent protrusions 101 can be 0.8-1.2, such as the second dimension can be equal to the spacing between adjacent protrusions 101.

[0066] For example, Figure 2 As shown, the thickness of the flat plate body 102 can be 0.5 to 1 mm, or 0.3 to 0.7 mm, etc. The thickness of the flat plate body 102 can be any value between 0.1 and 2 mm, and the examples are not listed here. For example, the first dimension can be 100 to 1000 nanometers, or 200 to 500 nanometers, or 300 to 700 nanometers, etc. The first dimension can be any value between 10 and 2000 nanometers, and the examples are not listed here. For example, the second dimension can be 20 to 500 nanometers, or 50 to 100 nanometers, or 200 to 500 nanometers, etc. The second dimension can be any value between 10 and 2000 nanometers, and the examples are not listed here.

[0067] In some examples, such as Figure 2 As shown, at least two planar diffractive lenses 100 include at least a first planar diffractive lens 110 and a second planar diffractive lens 120. The preset pattern of the first planar diffractive lens 110 includes at least a first preset pattern area 111, and the preset pattern of the second planar diffractive lens 120 includes at least a second preset pattern area 121. The orthographic projection of the first preset pattern area 111 on a plane parallel to the flat plate body 102 coincides with the orthographic projection of the second preset pattern area 121 on the same plane. At least one of the first size and the second size of at least one protrusion 101 in the first preset pattern area 111 and at least one protrusion 101 in the second preset pattern area differ. The preset pattern of the first planar diffractive lens 110 differs from the preset pattern of the second planar diffractive lens 120 in that the parameters of at least one protrusion 101 in the first preset pattern area 111 differ from the parameters of at least one protrusion 101 in the second preset pattern area 121.

[0068] For example, Figure 2 As shown, the number of protrusions 101 in the first preset pattern area 111 may be the same as the number of protrusions 101 in the second preset pattern area 121, but the present invention is not limited thereto. The number of protrusions 101 in the first preset pattern area 111 may also be different from the number of protrusions 101 in the second preset pattern area 121. For example, the interval between adjacent protrusions 101 in the first preset pattern area 111 may be equal to the interval between adjacent protrusions 101 in the second preset pattern area 121, but the present invention is not limited thereto. The interval between adjacent protrusions 101 in the first preset pattern area 111 may also be different from the interval between adjacent protrusions 101 in the second preset pattern area 121.

[0069] Figure 2 It is schematically shown that the first size of the protrusion 101 in the first preset pattern area 111 is different from the first size of the protrusion 101 in the second preset pattern area 121, but is not limited to this. The second size of the protrusion 101 in the first preset pattern area 111 can be the same as or different from the second size of the protrusion 101 in the second preset pattern area 121, and can be set according to product requirements.

[0070] For example, Figure 2As shown, at least one protrusion 101 at a position other than the first preset pattern area 111 in the first planar diffractive lens 110 may be different from at least one of the first size and the second size of at least one protrusion 101 at a position other than the second preset pattern area 121 in the second planar diffractive lens 120, but is not limited thereto. At least one protrusion 101 at a position other than the first preset pattern area 111 in the first planar diffractive lens 110 may have the same parameters as at least one protrusion 101 at a position other than the second preset pattern area 121 in the second planar diffractive lens 120.

[0071] In some examples, such as Figure 2 As shown, one of the first diffractive lens 110 and the second diffractive lens 120 is configured to converge light, and the other of the first diffractive lens 110 and the second diffractive lens 120 is configured to diverge light. For example, the first diffractive lens 110 is configured to converge light, and the second diffractive lens 120 is configured to diverge light.

[0072] The optical structure provided by the present disclosure can realize a lens assembly including a plane diffraction lens for converging light and a plane diffraction lens for diverging light by setting the parameters of the bulge in the first plane diffraction lens and the parameters of the bulge in the second plane diffraction lens, so as to replace general positive lenses and negative lenses with curved surfaces, such as spherical surfaces, aspherical surfaces or free-form surfaces, thereby avoiding aberration problems such as chromatic aberration, spherical aberration and coma caused by lenses with curved surfaces that affect the clarity of optical imaging, greatly improving the imaging effect of the lens assembly while minimizing the thickness, avoiding the problem of heavy weight caused by traditional injection-molded lenses.

[0073] In some examples, such as Figure 2 As shown, the material of the planar diffractive lens 100 includes at least one of quartz glass, single crystal silicon, silicon oxide, and titanium oxide. By selecting the material of the planar diffractive lens 100 and setting the parameters of the protrusions 101, the deflection direction of light of different wavelengths can be better controlled by different planar diffractive lenses 100, which is conducive to improving imaging effects.

[0074] In some examples, such as Figure 2As shown, the dimension of the lens assembly 10 in a direction perpendicular to the flat plate body 102 is no greater than 10 mm. The dimension of the lens assembly 10 may be the sum of the dimensions of all planar diffractive lenses 100. For example, the dimension of the lens assembly 10 in the X direction is no greater than 5 mm. For example, the dimension of the lens assembly 10 in the X direction is no greater than 3 mm. For example, the dimension of the lens assembly 10 in the X direction is no greater than 1 mm. For example, the dimension of the lens assembly 10 in the X direction is no greater than 0.5 mm. For example, the dimension of the lens assembly 10 in the X direction is no greater than 0.1 mm. For example, the dimension of the lens assembly 10 in the X direction is no greater than 7000 nanometers. For example, the dimension of the lens assembly 10 in the X direction is no greater than 6000 nanometers. For example, the dimension of the lens assembly 10 in the X direction is no greater than 5000 nanometers.

[0075] The lens assembly provided by the present disclosure can significantly reduce the thickness of the lens assembly by replacing a general lens with a curved surface, such as a spherical surface, an aspherical surface, or a free-form surface, with a flat diffractive lens.

[0076] In some examples, such as Figure 2 As shown, the lens assembly 10 includes multiple lenses, with each lens including at most one planar diffractive structure 10-1. For example, a lens may include one planar diffractive structure 10-1 or no planar diffractive structure 10-1. For example, when a lens includes a planar diffractive structure 10-1, it can be referred to as a planar diffractive lens 100. By configuring the same lens with a planar surface including multiple protrusions 101 on one side and a flat plate body 102 on the other side, the optical requirements of the lens assembly 10 can be met while also reducing manufacturing costs.

[0077] Of course, the embodiments of the present disclosure are not limited thereto, and at least one lens may include two planar diffraction structures, such as surfaces formed of multiple protrusions on both sides of a lens.

[0078] In some examples, such as Figure 2 As shown, the lens assembly 10 includes a second lens surface 202, which includes the surfaces of multiple protrusions 101 and one of the surfaces of the flat body 102. A phase retarder film 40 is located on the second lens surface 202, and the surface of the phase retarder film 40 away from the second lens surface 202 is flat. For example, the phase retarder film 40 is located on the surfaces of the multiple protrusions 101, and the thickness of the phase retarder film 40 is greater than the first dimension of the protrusions 101. The phase retarder film 40 may contact a portion of the surface of the protrusions 101, such as a portion of the surface of the groove structure between adjacent protrusions 101 may be spaced apart from the phase retarder film 40, such as the groove structure between adjacent protrusions 101 is not filled with the phase retarder film 40.

[0079] In some examples, such as Figure 2As shown, the lens assembly 10 includes a third lens surface 203, which includes a plurality of protrusions 101 and one of the surfaces of the flat body 102. The polarizing reflective film 30 is located on the third lens surface 203, and the side of the polarizing reflective film 30 away from the third lens surface 203 is a flat surface. For example, the polarizing reflective film 30 is located on a surface of the flat body 102.

[0080] Compared to the conventional curved surface lamination process used to bond polarizing reflective film to the aspherical surface of a lens, the optical structure provided herein improves the flatness of the film material during bonding, avoiding the softening and stretching of the polarizing reflective film that could affect its birefringence, thereby enhancing the overall optical performance of the optical structure, including clarity, stray light, and field of view. Furthermore, bonding both the phase retarder film and the polarizing reflective film to the surface of the flat diffractive lens reduces the angle between the phase retarder film's slow axis and the polarizing reflective film's light transmission axis, mitigating ghosting.

[0081] In some examples, such as Figure 2 As shown, the multiple protrusions 101 in the first diffractive lens 110 and the multiple protrusions 101 in the second diffractive lens 120 are arranged opposite each other and spaced apart. For example, the protrusions 101 in the first diffractive lens 110 are closer to the second diffractive lens 120 than the flat body 102, and the protrusions 101 in the second diffractive lens 120 are closer to the first diffractive lens 110 than the flat body 102. However, the disclosed embodiments are not limited to this. For example, in other examples, the protrusions 101 in the first diffractive lens 110 can be farther away from the second diffractive lens 120 than the flat body 102, and / or the protrusions 101 in the second diffractive lens 120 can be farther away from the first diffractive lens 110 than the flat body 102.

[0082] Figure 2 The positions of the first planar diffractive lens 110 and the second planar diffractive lens 120 can be interchanged.

[0083] For example, Figure 2 As shown, air 60 or a glue layer 60 , such as water glue, is provided between the first plane diffractive lens 110 and the second plane diffractive lens 120 .

[0084] In some examples, such as Figure 2As shown, the transflective film 20 is located on a first surface 301 of the main body 102 of the first diffractive lens 110, away from the plurality of protrusions 101. The polarizing reflective film 30 is located on a second surface 302 of the main body 102 of the second diffractive lens 120, away from the plurality of protrusions 101. The phase retarder film 40 is located between the first and second diffractive lenses 110, 120. For example, the phase retarder film 40 is located on the surface of the plurality of protrusions 101 of the first diffractive lens 110, and air 60 or an adhesive layer 60 is located between the phase retarder film 40 and the second diffractive lens 120. However, this is not limiting. The phase retarder film 40 can also be located on the surface of the plurality of protrusions 101 of the second diffractive lens 120. The first surface 301 can be the first lens surface 201, and the second surface 302 can be the third lens surface 203. Both are flat surfaces.

[0085] Figure 2 The surfaces of the planar diffraction lens through which light passes include the planar surface of the flat body 102 and the surface of the protrusion 101, and do not include curved surfaces in general lenses, such as aspherical surfaces and spherical surfaces.

[0086] Figure 2 The number of protrusions 101, the pitch of the protrusions 101, the first size and the second size of the protrusions 101, the distance between the first plane diffractive lens 110 and the second plane diffractive lens 120, the thickness of the flat body 102, the thickness of the transflective film 20, the thickness of the polarizing reflective film 30, and the thickness of the linear polarizing film 50 shown are merely illustrative and are not intended to limit the above parameters.

[0087] Figure 4 A schematic diagram of a partial cross-sectional structure of an optical structure provided according to another example of an embodiment of the present disclosure. Figure 4 The optical structure shown is Figure 2 The difference between the optical structures shown is the position of the phase delay film 40. Figure 4 As shown, the phase retarder film 40 is located on the side of the second flat surface 302 away from the first flat diffractive lens 110. For example, the phase retarder film 40 is located on the second flat surface 302. Compared to the conventional curved surface bonding process used to bond the phase retarder film to the aspherical surface of a lens, the optical structure provided by the present disclosure improves the flatness of the film material during the bonding process of the phase retarder film to the flat surface of the flat diffractive lens, avoids the softening and stretching of the phase retarder film, which could affect the birefringence of the film, and thus improves the overall optical performance of the optical structure, such as clarity, stray light, and field of view.

[0088] For example, Figure 4As shown, the polarizing reflective film 30 is located on the side of the phase retarder film 40 away from the second flat surface 302, and the linear polarizing film 50 is located on the side of the polarizing reflective film 30 away from the second flat surface 302. For example, air 60 or an adhesive layer 60 is disposed between the protrusions 101 of the first planar diffractive lens 110 and the protrusions 101 of the second planar diffractive lens 120.

[0089] Figure 4 The phase delay film 40 is shown with Figure 2 The phase retarder films 40 shown have the same parameters, which will not be described again. Figure 4 The other structures except the phase delay film 40 in the optical structure shown can be Figure 2 The corresponding structures shown have the same features.

[0090] Figure 5 and Figure 6 Schematic diagram of a partial cross-sectional structure of an optical structure provided according to different examples of the present disclosure. Figure 5 and Figure 6 The optical structure shown is Figure 4 The difference between the optical structures shown is that in the same planar diffractive lens, the size relationship between at least one of the first size S1 and the second size S2 of the protrusions 101 at different positions is different.

[0091] For example, Figure 5 As shown, in the same planar diffractive lens 100 , the first size S1 of at least two protrusions 101 is the same, but the second size S2 of the at least two protrusions 101 is different.

[0092] For example, Figure 5 As shown, the first size S1 of the protrusion 101 in the first predetermined pattern area 111 of the first planar diffractive lens 110 is the same as the first size S1 of the protrusion 101 in the second predetermined pattern area 121 of the second planar diffractive lens 120, but the second size S2 of the protrusion 101 in the first predetermined pattern area 111 is different from the second size S2 of the protrusion 101 in the second predetermined pattern area 121. For example, in the first planar diffractive lens 110, the first size S1 of the protrusion 101 in the first predetermined pattern area 111 is the same as the first size S1 of at least one protrusion 101 outside the first predetermined pattern area 111, and the second size S2 of the protrusion 101 in the first predetermined pattern area 111 is different from the second size S2 of at least one protrusion 101 outside the first predetermined pattern area 111. For example, in the second planar diffractive lens 120, the first size S1 of the protrusion 101 in the second preset pattern area 121 is the same as the first size S1 of at least one protrusion 101 outside the second preset pattern area 121, and the second size S2 of the protrusion 101 in the second preset pattern area 121 is different from the second size S2 of at least one protrusion 101 outside the second preset pattern area 121.

[0093] For example, Figure 6 As shown, in the same planar diffractive lens 100 , the first size S1 and the second size S2 of at least two protrusions 101 are different.

[0094] For example, Figure 6 As shown, the first size S1 of the protrusion 101 in the first predetermined pattern area 111 of the first planar diffractive lens 110 is different from the first size S1 of the protrusion 101 in the second predetermined pattern area 121 of the second planar diffractive lens 120, and the second size S2 of the protrusion 101 in the first predetermined pattern area 111 is different from the second size S2 of the protrusion 101 in the second predetermined pattern area 121. For example, in the first planar diffractive lens 110, the first size S1 of the protrusion 101 in the first predetermined pattern area 111 is different from the first size S1 of at least one protrusion 101 outside the first predetermined pattern area 111, and the second size S2 of the protrusion 101 in the first predetermined pattern area 111 is different from the second size S2 of at least one protrusion 101 outside the first predetermined pattern area 111. For example, in the second planar diffractive lens 120, the first size S1 of the protrusion 101 in the second preset pattern area 121 is different from the first size S1 of at least one protrusion 101 outside the second preset pattern area 121, and the second size S2 of the protrusion 101 in the second preset pattern area 121 is different from the second size S2 of at least one protrusion 101 outside the second preset pattern area 121.

[0095] Figure 7 for Figure 2 Schematic diagram of the planar structure of the first plane diffraction lens shown.

[0096] In some examples, such as Figure 7 As shown, at least one planar diffractive lens 100 includes multiple protrusions 101 arranged in a multi-ring configuration. The orthographic projections of each protrusion 101 on the flat plate body 102 are symmetrically distributed relative to lines extending along a first direction and a second direction, with the first direction being perpendicular to the second direction. For example, the first direction can be the Z direction, and the second direction can be the Y direction, but this is not limiting, and the first and second directions can be interchangeable. For example, when the optical structure is applied to a display device, one of the first and second directions can be parallel to the ground, or the display device can include a display screen located on the light-entering side of the optical structure, with the display surface of the display screen including an edge extending along the first direction and an edge extending along the second direction.

[0097] The optical structure provided by the present disclosure facilitates diffraction of light of an image emitted from a display screen to achieve better imaging quality by arranging the orthographic projections of each protrusion on the flat plate body to be symmetrically distributed relative to straight lines extending along the first direction and the second direction.

[0098] For example, Figure 2 and Figure 7As shown, the plurality of protrusions 101 in the planar diffractive lens 100 may be distributed in a diffraction array.

[0099] For example, Figure 2 and Figure 7 As shown, each protrusion 101 can have the same shape. For example, each protrusion 101 can be cylindrical. For example, the cylindrical shape can be a polygonal prism such as a square prism, a cross prism, or a circular cylinder, but is not limited thereto. For example, the shape of the protrusion 101 can also be conical, such as a polygonal pyramid, a cross pyramid, or a circular cone. For example, the orthographic projection of the protrusion 101 on the flat plate body 102 can be a rectangle, and the second dimension S2 can be the diagonal of the rectangle. For example, the orthographic projection of the protrusion 101 on the flat plate body 102 can be a circle, and the second dimension can be the diameter of the circle.

[0100] Of course, the embodiments of the present disclosure are not limited thereto, and the shapes of the protrusions at different positions of the planar diffractive lens may be different. For example, the planar diffractive lens includes at least two zones, and the shapes of the protrusions in different zones are different.

[0101] Figure 8 FIG. 1 is a schematic diagram of a partial cross-sectional structure of a display device according to another embodiment of the present disclosure. Figure 8 As shown, the display device includes a display screen 70 and the optical structure in any of the above examples. The display screen 70 is located on a side of the transflective film 20 away from the polarizing reflective film 30 . Figure 8 The optical structure is schematically shown as Figure 2 The optical structure shown is, but not limited to, the optical structure can also be Figures 4 to 6 Optical structure shown in any example.

[0102] For example, Figure 8 As shown, the first planar diffractive lens 110 is located between the second planar diffractive lens 120 and the display screen 70 .

[0103] For example, Figure 8 As shown, the display surface of the display screen 70 is located at the focal plane of the light incident side of the optical structure.

[0104] For example, Figure 8 As shown, the display screen 70 may further include a plurality of sub-pixels (not shown) and a micro-lens array (not shown) located on the light-emitting side of the plurality of sub-pixels.

[0105] For example, Figure 8 As shown, the display screen 70 can be any type of display screen, such as a liquid crystal display screen, an organic light emitting diode display screen, a quantum dot display screen, etc.

[0106] 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-throw folded optical path.

[0107] 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., but the embodiments of the present disclosure are not limited thereto.

[0108] There are a few points to note:

[0109] (1) The drawings of the embodiments of the present disclosure only involve structures related to the embodiments of the present disclosure, and other structures can refer to general designs.

[0110] (2) In the absence of conflict, features in the same embodiment and different embodiments of the present disclosure may be combined with each other.

[0111] The foregoing description is merely an exemplary embodiment of the present disclosure and is not intended to limit the scope of protection of the present disclosure. The scope of protection of the present disclosure is determined by the appended claims.

Claims

1. An optical structure comprising: A lens assembly comprising at least two planar diffractive lenses arranged in a stacked manner; a transflective film, located on the lens surface of the lens assembly; a polarized reflective film, located on the lens surface of the lens assembly; a phase delay film, located on the side of the transflective film facing the polarizing reflective film, The planar diffraction lens includes a flat plate body and a planar diffraction structure distributed on the flat plate body. The planar diffraction structure includes a plurality of protrusions forming a preset pattern. Different planar diffraction structures have different preset patterns. The planar diffraction structure is located between the polarizing reflective film and the transflective film. The size of the protrusion in a direction perpendicular to the flat plate body is a first size, and the maximum size of the protrusion in a direction parallel to the flat plate body is a second size. In at least one planar diffractive lens, at least one of the first size and the second size of at least two protrusions is different.

2. The optical structure according to claim 1, wherein In each planar diffractive lens, at least one of the first size and the second size of at least two protrusions is different.

3. The optical structure according to claim 1, wherein: The lens assembly includes a first lens surface, which is a surface on the light incident side of the lens assembly. The transflective film is located on the first lens surface, and a surface of the transflective film away from the first lens surface is a plane.

4. The optical structure according to claim 1, wherein: Each planar diffraction lens includes the flat plate body and the planar diffraction structure. The thickness of the flat plate body is 0.1 to 2 mm, the first size is 50 to 5000 nanometers, the second size is 10 to 2000 nanometers, and the interval between adjacent protrusions is 10 to 2000 nanometers.

5. The optical structure according to claim 1, wherein In the at least one planar diffractive lens, the plurality of protrusions are distributed in a multi-ring shape; The orthographic projections of each protrusion on the flat plate body are symmetrically distributed relative to straight lines extending along a first direction and a second direction, wherein the first direction is perpendicular to the second direction.

6. The optical structure according to claim 1, wherein: The at least two planar diffractive lenses include at least a first planar diffractive lens and a second planar diffractive lens, the preset pattern of the first planar diffractive lens includes at least a first preset pattern area, the preset pattern of the second planar diffractive lens includes at least a second preset pattern area, the orthographic projection of the first preset pattern area on a plane parallel to the flat plate body and the orthographic projection of the second preset pattern area on the plane coincide with each other, and at least one of the first size and the second size of at least one protrusion in the first preset pattern area and at least one protrusion in the second preset pattern area are different.

7. The optical structure according to claim 6, wherein: One of the first and second planar diffractive lenses is configured to converge light, and the other of the first and second planar diffractive lenses is configured to diverge light.

8. The optical structure according to claim 6, wherein: The plurality of protrusions in the first planar diffractive lens and the plurality of protrusions in the second planar diffractive lens are opposite to each other and are spaced apart.

9. The optical structure according to claim 8, wherein: The transflective film is located on a first flat surface of the flat body of the first flat diffractive lens away from the plurality of protrusions, and the polarizing reflective film is located on a second flat surface of the flat body of the second flat diffractive lens away from the plurality of protrusions; The phase delay film is located between the first plane diffraction lens and the second plane diffraction lens, or the phase delay film is located on a side of the second flat surface away from the first plane diffraction lens.

10. The optical structure according to any one of claims 1 to 8, wherein: The lens assembly includes a second lens surface, which includes the multiple raised surfaces and one of the surfaces of the flat body. The phase delay film is located on the second lens surface, and the side surface of the phase delay film away from the second lens surface is flat.

11. The optical structure according to any one of claims 1 to 8, wherein: The lens assembly includes a third lens surface, which includes the surfaces of the multiple protrusions and one of the surfaces of the flat body. The polarizing reflective film is located on the third lens surface, and the side surface of the polarizing reflective film away from the third lens surface is a plane.

12. The optical structure according to any one of claims 1 to 9, wherein: The lens assembly includes a plurality of lenses, and each lens includes at most one planar diffraction structure.

13. The optical structure according to any one of claims 1 to 9, wherein: In at least one planar diffractive lens, the flat plate body and the plurality of protrusions are an integrated structure.

14. The optical structure according to any one of claims 1 to 9, wherein: The dimension of the lens assembly in a direction perpendicular to the flat plate body is no greater than 10 mm.

15. The optical structure according to any one of claims 1 to 9, further comprising: The linear polarizing film is located on a side of the polarizing reflective film away from the phase retardation film.

16. The optical structure according to any one of claims 1 to 9, wherein: The material of the planar diffraction lens includes at least one of quartz glass, single crystal silicon, silicon oxide, and titanium oxide.

17. A display device comprising a display screen and the optical structure according to any one of claims 1 to 16, wherein: The display screen is located on a side of the transflective film away from the polarizing reflective film.

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