Novel composite optical structure and peep-proof display device

Abstract

According to the novel composite optical structure and the peep-proof display device, the structure modulates light, refracts small-angle incident light and absorbs large-angle incident light, and therefore the divergence angle of the light is restrained. The novel composite optical structure is composed of a light control layer, a spacing layer and a light beam distribution layer. Wherein the light control layer is tightly attached to the spacing layer. The light control layer is composed of a lens array layer and is used for modulating light rays reaching the light control layer through the spacing layer and the light beam distribution layer and refracting small-angle light rays to achieve light emission. The spacing layer is located between the light control layer and the light beam distribution layer. The light beam distribution layer is composed of a light-transmitting array area and a non-light-transmitting array area and has the function of light beam distribution and absorption, the light beam distribution layer and the spacing layer act together to distribute small-angle light to the lens units right opposite to the light-transmitting area, and large-angle light is absorbed.

Description

Technical Field

[0001] The present invention relates to the field of optical display technology, and in particular to a novel composite optical structure and an anti-peeping display device. Background Art

[0002] Privacy film is an optical film that controls the direction of light propagation. It is used to transmit light information in a specified direction and limit observers in other directions from receiving this information, thereby playing a role in privacy protection. Privacy film can be placed on the surface of display images or other information carriers. In the direction perpendicular to the privacy film, background light can pass through the privacy film, and observers can see this information. As the tilt angle increases, the visibility of the information gradually decreases. When the angle between the tilt angle and the plane of the privacy film reaches a certain value, the information is completely blocked, thereby preventing observers in other directions from obtaining the information, playing a role in privacy protection.

[0003] Traditional privacy films use the principle of black grating light absorption to converge light at the front angle, making it visible at the front angle and black at the side angle, thus achieving the effect of privacy protection at left and right angles. However, due to the serious light absorption of black grating, the transmittance of privacy films will be greatly reduced whether they are used in backlight or on the display surface, generally only 60%. In addition, the privacy protection viewing angle of traditional privacy films is generally 58°, but due to the difficulty in its process preparation and the limited microstructure height, it is difficult to further reduce the privacy protection viewing angle. At the same time, the surface of ordinary privacy films is not processed and is easily disturbed by external light, affecting the privacy protection display effect, and the grating with too small size will greatly increase the probability of black lines, white lines, dirt and other undesirable phenomena. Judging from the current patents, no effective solution has been proposed for the problems in related technologies. Summary of the invention

[0004] The present invention provides a novel composite optical structure and an anti-peeping display device to solve the defects in the prior art and achieve the following technical effects: by precisely modulating the light through the lens array layer in the light control layer, the present invention can more finely control the refraction and focusing of the light, thereby providing a clearer front-view image and a more effective side-view anti-peeping effect.

[0005] The novel composite optical structure according to the first aspect of the present invention comprises: A light control layer, including a lens array layer; The beam distribution layer includes light-transmitting array areas and non-light-transmitting array areas that are staggered; A spacing layer, wherein the light control layer and the beam distribution layer are respectively located on both sides of the spacing layer and are respectively tightly attached to the spacing layer; Wherein, the light-transmitting array area and the lens array layer are arranged correspondingly in position.

[0006] According to one embodiment of the present invention, the lens array layer is composed of a plurality of lens units, the curvature radius of the lens unit is R, the arch height of the lens unit is H1, and the thickness of the spacer layer is H2, then H1, H2 and R satisfy the following first relationship: R≤H1+H2≤2.2R.

[0007] According to one embodiment of the present invention, in the beam distribution layer, the light-transmitting array region is an array structure composed of a plurality of periodic light-transmitting regions, the non-light-transmitting array region is an array structure composed of a plurality of periodic light-opaque regions, and the light-transmitting regions and the light-opaque regions are staggeredly distributed; The number of the light-transmitting areas is equal to that of the lens units and they are arranged in a one-to-one correspondence in position, and the aperture of the light-transmitting area is smaller than the aperture of the lens unit.

[0008] According to an embodiment of the present invention, the aperture of the light-transmitting area of ​​the light-transmitting array area is D, and the aperture of the lens unit of the lens array layer of the light-controlling layer is P, then D and P satisfy the following second relationship: 0.2P≤D≤0.5P.

[0009] According to an embodiment of the present invention, the light-transmitting area is aligned with the center of the lens unit arranged corresponding to the position thereof.

[0010] According to an embodiment of the present invention, the opaque area is provided with pure black opaque material or opaque paint.

[0011] According to an embodiment of the present invention, the radius of curvature of the lens unit is R, and the center distance between every two adjacent lens units is P, then R and P satisfy the following third relationship: R≤P≤2R.

[0012] According to an embodiment of the present invention, the lens array layer in the light control layer is an array structure composed of multiple one-dimensional linear lens units; or, the lens array layer in the light control layer is an array structure composed of multiple two-dimensional lens units.

[0013] An anti-peeping display device according to an embodiment of the second aspect of the present invention includes: A display screen and the novel composite optical structure as described in the embodiment of the first aspect of the present invention, wherein the novel composite optical structure is closely attached to the display screen.

[0014] The invention provides a new composite optical structure with higher limiting angle efficiency, which can better protect privacy and has at least the following advantages compared with related technologies.

[0015] (1) More precise light control: By precisely modulating the light through the lens array layer in the light control layer, the present invention can more finely control the refraction and focusing of light, thereby providing clearer front-angle images and more effective side-angle anti-peeping effects.

[0016] (2) Improved transmittance: Due to the design of the lens array layer, the present invention can improve the transmittance of light while maintaining the anti-peeping effect, thereby reducing the light absorption problem commonly seen in traditional anti-peeping films.

[0017] (3) Smaller anti-peeping angle: Through the precisely designed lens unit and beam distribution layer, the present invention can achieve a smaller anti-peeping angle and provide better privacy protection.

[0018] (4) Reducing undesirable phenomena: Optimized grating structure and material selection can help reduce undesirable phenomena such as black lines, white lines, and dirt, and improve the overall display effect and aesthetics of the optical film.

[0019] (5) Enhanced environmental adaptability and stronger structural stability: The use of the spacer layer, combined with the design of the light control layer and the beam distribution layer, can enable the optical structure of the present invention to maintain a good anti-peeping effect under different lighting conditions. At the same time, the light control layer and the beam distribution layer are tightly attached to the spacer layer, respectively, providing better structural stability and durability.

[0020] (6) Reducing light interference: Through a specific optical structure design, the present invention can reduce the interference of external light on the display effect and improve the display quality in complex light environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is one of the structural schematic diagrams of the novel composite optical structure provided by the present invention.

[0023] Figure 2 This is the second structural schematic diagram of the novel composite optical structure provided by the present invention.

[0024] Figure 3 This is the third structural schematic diagram of the novel composite optical structure provided by the present invention.

[0025] Figure 4 This is the fourth structural schematic diagram of the novel composite optical structure provided by the present invention.

[0026] Figure 5 This is the fifth structural schematic diagram of the novel composite optical structure provided by the present invention.

[0027] Figure 6 This is the sixth structural schematic diagram of the novel composite optical structure provided by the present invention.

[0028] Figure 7 It is a structural schematic diagram of a novel composite optical structure provided by a specific embodiment of the present invention.

[0029] Figure 8 It is a structural schematic diagram of the anti-peeping display device provided by the present invention.

[0030] Reference numerals: 1. Light control layer; 11. Lens unit; 2. Light beam distribution layer; 21. Light-transmitting area; 22. Light-opaque area; 3. Spacer layer; 4. Display screen. DETAILED DESCRIPTION

[0031] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0033] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0034] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0035] A novel composite optical structure and an anti-peeping display device having the novel composite optical structure provided by the present invention will be described below with reference to the accompanying drawings.

[0036] like Figures 1 to 8 As shown, the novel composite optical structure according to the first aspect of the embodiment of the present invention includes a light control layer 1, a beam distribution layer 2 and a spacer layer 3.

[0037] The light control layer 1 includes a lens array layer; the light beam distribution layer 2 includes staggered light-transmitting array areas and non-light-transmitting array areas; the light control layer 1 and the light beam distribution layer 2 are respectively located on both sides of the spacing layer 3, and are tightly attached to the spacing layer 3; wherein the light-transmitting array area and the lens array layer are arranged correspondingly in position.

[0038] According to an embodiment of the present invention, the novel composite optical structure consists of three main parts: a light control layer 1, a beam distribution layer 2 and a spacer layer 3. The structure and function of each layer are explained in detail below.

[0039] (1) The light control layer 1 is composed of a lens array layer, and the lens unit 11 can be a one-dimensional linear lens unit 11 (cylindrical lens unit 11) or a two-dimensional lens unit 11 (such as a circular lens unit 11, a square lens unit 11).

[0040] The specific functions of the light control layer 1 are as follows: modulate the light incident on the layer, refract the light at a small angle, and realize directional emission of light. The curvature radius and arch height of the lens unit 11 work together with the thickness of the spacer layer 3 to meet specific optical performance requirements.

[0041] (2) The beam distribution layer 2 consists of a light-transmitting array area (C1) and a non-light-transmitting array area (C2), and these two areas are alternately distributed.

[0042] The specific functions of the beam distribution layer 2 are as follows: the light-transmitting array area allows light to pass through, while the non-light-transmitting array area absorbs or blocks light. The light-transmitting array area and the lens array layer of the light-controlling layer 1 are arranged in a corresponding position to achieve accurate distribution of light.

[0043] (3) The spacer layer 3 is located between the light control layer 1 and the beam distribution layer 2, and is closely attached to both.

[0044] The specific functions of the spacer layer 3 are as follows: as a physical support, it maintains the relative position of the lens array layer and the beam distribution layer 2, and ensures precise control of light when passing through the structure.

[0045] The working principle and working process of the novel composite optical structure according to the embodiment of the present invention are as follows: First, light is incident on the composite optical structure from the display screen 4 or other light sources. Then, the light-transmitting array area (C1) and the light-impermeable array area (C2) of the beam distribution layer 2 begin to preliminarily distribute the incident light. The light-transmitting array area allows light to pass through, while the light-impermeable array area absorbs light incident at a large angle.

[0046] Then, the light passing through the beam distribution layer 2 enters the light control layer 1, and the lens array layer modulates the light. The lens unit 11 refracts and focuses the light incident at a small angle according to its curvature radius and arch height to achieve directional emission.

[0047] Afterwards, the light modulated by the light control layer 1 is emitted in a predetermined direction, mainly perpendicular to the direction of the optical structure. In this way, an observer facing the display screen 4 can see a clear image, while an observer from the side may see a blurred or invisible image due to the refraction and absorption of light.

[0048] It can be understood that due to the synergistic effect of the lens array layer and the beam distribution layer 2, the light propagation angle is precisely controlled, thereby achieving an anti-peeping effect. Only observers within a specific viewing angle can see a clear image, while observers at other viewing angles are restricted. At the same time, due to the presence of the spacer layer 3, the entire structure has better environmental adaptability and can maintain a stable anti-peeping effect under different lighting conditions.

[0049] In summary, the composite optical structure of the present invention not only improves the anti-peeping effect, but also may improve the light transmittance and the stability of the optical structure, so that it can perform excellent performance in a variety of application scenarios.

[0050] In the related art, the traditional privacy film uses the principle of black grating light absorption to make the light converge at the front angle, so that the front angle is visible and the side angle is black, thus achieving the effect of privacy protection at left and right angles. However, due to the serious light absorption of the black grating, the transmittance of the privacy film will be greatly reduced whether it is used in the backlight or the display surface, generally only 60%. In addition, the privacy protection viewing angle of the traditional privacy film is generally 58°, but due to the difficulty in its process preparation and the limited microstructure height, it is difficult to further reduce the privacy protection viewing angle. At the same time, the surface of the ordinary privacy film is not processed and is easily disturbed by external light, affecting the privacy protection display effect, and the grating with too small size will greatly increase the probability of black lines, white lines, dirt and other undesirable phenomena. From the current patents, no effective solution has been proposed for the problems in the related art.

[0051] Therefore, in order to solve the technical defects existing in the above-mentioned related technologies, the present invention provides a new composite optical structure with higher limiting angle efficiency, which can better protect privacy and has at least the following advantages compared with the related technologies.

[0052] (1) More precise light control: By precisely modulating the light through the lens array layer in the light control layer 1, the present invention can more finely control the refraction and focusing of the light, thereby providing a clearer front-view image and a more effective side-view anti-peeping effect.

[0053] (2) Improved transmittance: Due to the design of the lens array layer, the present invention can improve the transmittance of light while maintaining the anti-peeping effect, thereby reducing the light absorption problem commonly seen in traditional anti-peeping films.

[0054] (3) Smaller anti-peeping viewing angle: Through the precisely designed lens unit 11 and the beam distribution layer 2, the present invention can achieve a smaller anti-peeping viewing angle and provide better privacy protection.

[0055] (4) Reducing undesirable phenomena: Optimized grating structure and material selection can help reduce undesirable phenomena such as black lines, white lines, and dirt, and improve the overall display effect and aesthetics of the optical film.

[0056] (5) Enhanced environmental adaptability and stronger structural stability: The use of the spacer layer 3, combined with the design of the light control layer 1 and the beam distribution layer 2, can enable the optical structure of the present invention to maintain a good anti-peeping effect under different lighting conditions. At the same time, the light control layer 1 and the beam distribution layer 2 are tightly attached to the spacer layer 3, respectively, providing better structural stability and durability.

[0057] (6) Reducing light interference: Through a specific optical structure design, the present invention can reduce the interference of external light on the display effect and improve the display quality in complex light environments.

[0058] like Figure 3 and Figure 4 As shown, according to some embodiments of the present invention, the lens array layer is composed of a plurality of lens units 11 arrayed along the length direction of the spacer layer 3, the radius of curvature of the lens unit 11 is R, the arch height of the lens unit 11 is H1, and the thickness of the spacer layer 3 is H2, then H1, H2 and R satisfy the following first relationship: R≤H1+H2≤2.2R.

[0059] It can be understood that the above first relationship ensures the size matching between the lens unit 11 and the spacer layer 3 to achieve the expected optical effect, such as focusing and direction control of light.

[0060] Specifically, by limiting the maximum value of H1+H2 to not more than 2.2R, the use of materials is reduced, the cost is reduced, and the anti-peeping effect is improved. At the same time, setting the minimum value of H1+H2 not less than R can ensure that the lens unit 11 has enough space to form the required optical path.

[0061] In addition, by adjusting the values ​​of H1, H2 and R, optical structures that meet different application requirements, such as different anti-peeping angles and transmittances, can be designed.

[0062] In this way, the appropriate size relationship helps to maintain the stability of the structure, avoid deformation or damage of the lens unit 11 or the spacing layer 3 due to improper size, and also helps to improve the efficiency of the optical structure, reduce the absorption of light in the structure, and improve the utilization rate of light.

[0063] like Figure 1 As shown, according to some embodiments of the present invention, in the beam distribution layer 2, the light-transmitting array area is an array structure composed of a plurality of periodic light-transmitting areas 21, and the non-light-transmitting array area is an array structure composed of a plurality of periodic light-opaque areas 22, and the light-transmitting areas 21 and the light-opaque areas 22 are alternately distributed along the length direction of the spacer layer 3.

[0064] The number of the light-transmitting regions 21 is equal to that of the lens units 11 and they are arranged in a one-to-one correspondence with each other. This correspondence ensures that the light modulated by each lens unit 11 can accurately enter the corresponding light-transmitting region 21 .

[0065] The aperture of the light-transmitting area 21 is smaller than the aperture of the lens unit 11 . This design can further improve the focusing degree of light, so that the light passes through the light-transmitting area 21 more concentratedly, thereby improving the directionality and anti-peeping effect of the optical structure.

[0066] Among them, in the beam distribution layer 2, the light-transmitting area 21 allows light incident at a small angle to pass through, thereby achieving directional emission of light; while the light-impermeable area 22 absorbs light incident at a large angle, thereby reducing the light received by side observers and enhancing the anti-peeping effect.

[0067] In this way, by precisely controlling the size and distribution of the light-transmitting area 21 and the light-impermeable area 22, the efficiency of the optical structure can be improved, the loss of light can be reduced, and the utilization rate of light can be improved. At the same time, the orderly arrangement of the light-transmitting area 21 and the light-impermeable area 22 helps to provide a clear visual effect at a front viewing angle, while achieving an effective anti-peeping effect at a side viewing angle.

[0068] like Figure 6 As shown, in some specific embodiments, the aperture of the light-transmitting area 21 of the light-transmitting array area is D, and the aperture of the lens unit 11 of the lens array layer of the light-controlling layer 1 is P, then D and P satisfy the following second relationship: 0.2P≤D≤0.5P.

[0069] It should be explained that by adjusting the ratio of D and P, it is possible to adapt to different viewing angle requirements, achieve clear display within a specific viewing angle range and anti-peeping effect at other viewing angles. Specifically, a smaller aperture of the light-transmitting area 21 helps limit the propagation angle of light and enhance the anti-peeping effect, while a larger aperture of the light-transmitting area 21 can ensure sufficient light to pass through to maintain a good display effect.

[0070] Thus, by limiting the size of the aperture D of the light-transmitting area 21 relative to the aperture P of the lens unit 11 , it can be ensured that the light can be effectively focused in the light-transmitting area 21 after being refracted by the lens unit 11 , thereby improving the directivity and anti-peeping effect of the optical structure.

[0071] In addition, a proper aperture ratio can reduce the loss of light in the light-transmitting area 21, improve the overall efficiency of the optical structure, and enhance the stability of the optical structure.

[0072] like Figure 6 As shown, in some specific embodiments, the light-transmitting area 21 is aligned with the center of the lens unit 11 arranged corresponding to the position thereof.

[0073] It can be understood that the center alignment ensures that the light can accurately enter the corresponding light-transmitting area 21 after being refracted by the lens unit 11, thereby achieving accurate control of the light propagation path. And when the light-transmitting area 21 is aligned with the center of the lens unit 11, the light can be more concentratedly passed through the light-transmitting area 21 after being refracted by the lens unit 11, thereby improving the focusing efficiency and the light utilization efficiency.

[0074] In this way, the center-aligned design helps to limit the propagation angle of light, so that only the observer facing the display screen 4 can see a clear image, while the image seen by the side observer becomes blurred due to the focusing of light, thereby enhancing the anti-peeping effect.

[0075] like Figure 5As shown, in some specific embodiments, the opaque area 22 is provided with a pure black opaque material or opaque paint.

[0076] In this way, the use of pure black opaque materials or coatings is relatively easy to manufacture and maintain, which can reduce production costs and maintenance difficulties. At the same time, opaque materials or coatings usually have good weather resistance and wear resistance, which helps to improve the durability and service life of the optical structure.

[0077] This design can adapt to different application scenarios and environments, such as outdoor display, public information display, etc., and provide stable display effects.

[0078] like Figure 7 As shown, according to some embodiments of the present invention, the radius of curvature of the lens unit 11 is R, and the center distance between every two adjacent lens units 11 is P, then R and P satisfy the following third relationship: R≤P≤2R.

[0079] Thus, the appropriate ratio of R and P helps to provide a clearer and brighter image at a normal viewing angle, improving the user's visual experience. The appropriate selection of the center spacing P can reduce the interference caused by the reflection of light between the lens units 11 and improve the clarity and contrast of the image.

[0080] Specifically, on the one hand, the purpose of the center spacing P being greater than R is to ensure focusing ability and prevent excessive crossing. For example, a suitable center spacing P helps to improve the focusing ability of the lens unit 11, so that light can be more accurately focused on the light-transmitting area 21; on the other hand, by limiting the maximum value of P to not exceed 2R, a tight structural arrangement can be ensured, reducing the light received by side observers, thereby enhancing the anti-peeping effect.

[0081] like Figures 1 to 8 As shown, in some specific embodiments of the present invention, the lens array layer in the light control layer 1 is an array structure composed of a plurality of one-dimensional linear lens units 11. For example, the lens array layer is composed of a plurality of cylindrical lens units 11 arranged in an array.

[0082] In some other specific embodiments of the present invention, the lens array layer in the light control layer 1 is an array structure composed of a plurality of two-dimensional lens units 11. For example, the two-dimensional lens unit 11 includes but is not limited to a square lens unit 11, a circular lens unit 11 or units of other shapes.

[0083] A specific embodiment of the novel composite optical structure of the present invention is given below with reference to the accompanying drawings.

[0084] like Figure 7 As shown, the composite optical structure film comprises: a light control layer 1, a spacer layer 3 and a beam distribution layer 2. The light control layer 1 comprises a lens array; the beam distribution layer 2 comprises a light-transmitting array area and a non-light-transmitting array area.

[0085] The light control layer 1 and the light beam distribution layer 2 are respectively located on two sides of the spacer layer 3 and are tightly attached to the spacer layer 3 .

[0086] In the light control layer 1, the lens array layer is composed of a plurality of lens units 11, the plane of the lens unit 11 is in contact with the spacer layer 3, the height H1 of the convex part of the lens unit 11 is 0.0197 mm, the diameter P is 0.052 mm, the radius of curvature R is 0.027 mm, the center spacing of adjacent lens units 11 is consistent with the center spacing of adjacent light-transmitting units, which is 0.052 mm, and the lens unit 11 is aligned with the center of the light-transmitting array unit. Further, the material refractive index of the lens array layer is N1=1.58.

[0087] The spacer layer 3 is tightly attached to the light control layer 1, and the thickness H2 of the spacer layer 3 is 0.0325 mm. The spacer layer 3 can be made of PET material or a composite of multiple transparent materials to ensure that the light control layer 1 is fixed and that there is a certain distance between the light control layer 1 and the light-transmitting array area and the non-light-transmitting array area of ​​the beam distribution layer 2. Furthermore, the material refractive index of the spacer layer 3 is N2=1.65.

[0088] In the beam distribution layer 2, the material of the non-transparent array area can be pure black non-transparent material or corresponding non-transparent coating. Further, the light-transmitting aperture D of the light-transmitting unit in the light-transmitting array area of ​​the beam distribution layer 2 is 0.016 mm, and the center spacing P of adjacent light-transmitting units is 0.052 mm.

[0089] Compared with the prior art, the composite optical structure film proposed in this embodiment can effectively converge light incident at a small angle and absorb light incident at a large angle, thereby playing a role in light convergence.

[0090] like Figure 8 As shown, the anti-peeping display device according to the second embodiment of the present invention includes a display screen 4 and a novel composite optical structure as described in the first embodiment of the present invention, and the novel composite optical structure is closely attached to the display screen 4.

[0091] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0092] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A novel composite optical structure, characterized in that: include: A light control layer, including a lens array layer; The beam distribution layer includes light-transmitting array areas and non-light-transmitting array areas that are staggered; A spacing layer, wherein the light control layer and the beam distribution layer are respectively located on both sides of the spacing layer and are respectively tightly attached to the spacing layer; Wherein, the light-transmitting array area and the lens array layer are arranged correspondingly in position.

2. The novel composite optical structure according to claim 1, characterized in that: The lens array layer is composed of a plurality of lens units, the curvature radius of the lens unit is R, the arch height of the lens unit is H1, and the thickness of the spacer layer is H2. Then H1, H2 and R satisfy the following first relationship: R≤H1+H2≤2.2R.

3. The novel composite optical structure according to claim 2, characterized in that: In the beam distribution layer, the light-transmitting array region is an array structure composed of a plurality of periodic light-transmitting regions, the non-light-transmitting array region is an array structure composed of a plurality of periodic light-opaque regions, and the light-transmitting regions and the light-opaque regions are alternately distributed; The number of the light-transmitting areas is equal to that of the lens units and they are arranged in a one-to-one correspondence in position, and the aperture of the light-transmitting area is smaller than the aperture of the lens unit.

4. The novel composite optical structure according to claim 3, characterized in that: The aperture of the light-transmitting area of ​​the light-transmitting array area is D, and the aperture of the lens unit of the lens array layer of the light-controlling layer is P, then D and P satisfy the following second relationship: 0.2P≤D≤0.5P.

5. The novel composite optical structure according to claim 3, characterized in that: The light-transmitting area is aligned with the center of the lens unit arranged corresponding to the position thereof.

6. The novel composite optical structure according to claim 3, characterized in that: The opaque area is provided with pure black opaque material or opaque paint.

7. The novel composite optical structure according to any one of claims 2 to 6, characterized in that: The radius of curvature of the lens unit is R, and the center distance between every two adjacent lens units is P, then R and P satisfy the following third relationship: R≤P≤2R.

8. The novel composite optical structure according to any one of claims 2 to 6, characterized in that: The lens array layer in the light control layer is an array structure composed of a plurality of one-dimensional linear lens units or a plurality of two-dimensional lens units.

9. An anti-peeping display device, characterized in that: include: A display screen and a novel composite optical structure as claimed in any one of claims 1 to 8, wherein the novel composite optical structure is closely attached to the display screen.

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