Field lenses and display devices

Abstract

The application provides a field lens and a display device, and relates to the technical field of display. The field lens comprises a lens body and an optical structure. The lens body comprises at least two gratings. The lens body comprises a first side and a second side in a direction perpendicular to a plane where the lens body is located. The optical structure is located on a side of the at least two gratings close to the second side. The optical structure is used for blocking at least part of visible light from being incident on one side of the lens body and / or for blocking at least part of visible light reflected by the grating from being emitted to the second side of the lens body. In this way, the number of reflected light rays emitted to the second side of the lens body after being reflected by the lens body is reduced by blocking at least part of visible light from being incident on one side of the lens body and / or blocking at least part of visible light reflected by the grating from being emitted to the second side of the lens body, so that the generation of diffraction fringes is reduced, and the influence of the diffraction fringes on the display effect of the display device is weakened.

Description

Technical Field

[0001] This invention relates to the field of display technology, and more specifically, to a field lens and a display device. Background Technology

[0002] In holographic 3D display devices, field lenses composed of stacked multilayer volume holographic gratings can be used to converge light. Each layer of volume holographic grating is fabricated on a substrate. After external natural light undergoes specular reflection through the multilayer substrate, it undergoes transmission diffraction through the multilayer volume holographic gratings. Due to the angle and wavelength selectivity of the volume holographic gratings, the reflected light from the field lens will cause the generation of diffraction fringes. The diffraction fringes will present multiple layers of chaotic rainbow fringes, which will affect the display effect of the display device. Summary of the Invention

[0003] In view of this, the present invention provides a field lens and a display device to improve the problem of diffraction fringes affecting the display effect.

[0004] In a first aspect, this application provides a field lens, including a lens body and an optical structure;

[0005] The mirror body includes at least two layers of gratings. Along a direction perpendicular to the plane where the mirror body is located, the mirror body includes a first side and a second side. The optical structure is located on the side of at least one layer of the gratings closer to the second side.

[0006] The optical structure is used to block at least a portion of visible light incident on one side of the mirror and / or to block at least a portion of visible light emitted to the second side of the mirror after being reflected by the grating.

[0007] Secondly, this application provides a field lens, including a lens body and an optical structure;

[0008] The mirror body includes at least two layers of gratings. Along a direction perpendicular to the plane where the mirror body is located, the mirror body includes a first side and a second side. The optical structure is located on the side of at least one layer of the gratings closer to the second side.

[0009] The angle at which the mirror body diffracts the first color light is θ1, and the angle at which the optical structure allows the first color light to exit is α1, where α1 < θ1; the minimum angle at which the mirror body diffracts the first color light is A1, where α1 < A1.

[0010] Thirdly, this application provides a display device including the aforementioned field lens.

[0011] Compared with the prior art, the field lens and display device provided by the present invention achieves at least the following beneficial effects:

[0012] This application provides a field lens and a display device. The field lens includes a lens body and an optical structure. The optical structure is located on the second side of the field lens near the lens body, with at least one grating layer. The optical structure blocks at least a portion of the visible light incident on one side of the lens body and / or blocks at least a portion of the visible light emitted to the second side of the lens body after reflection by the grating. This reduces the amount of reflected light emitted to the second side of the lens body after reflection, thereby reducing the generation of diffraction fringes and weakening the impact of diffraction fringes on the display effect of the display device.

[0013] Of course, any product implementing this invention does not necessarily need to achieve all of the technical effects described above at the same time.

[0014] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0015] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the invention and, together with their description, serve to explain the principles of the invention.

[0016] Figure 1 The image shown is a schematic diagram of a field lens provided in an embodiment of this application;

[0017] Figure 2 The image shown is a three-dimensional perspective view of a field lens provided in an embodiment of this application;

[0018] Figure 3 The image shown is provided in an embodiment of this application. Figure 2 A cross-sectional view of BB';

[0019] Figure 4 The image shown is provided in an embodiment of this application. Figure 1 A cross-sectional view of AA';

[0020] Figure 5 The diagram shown is a schematic representation of an optical structure provided in an embodiment of this application.

[0021] Figure 6 The diagram shown is another structural schematic of the optical structure provided in the embodiment of this application;

[0022] Figure 7 The image shown is provided in an embodiment of this application. Figure 2 Another cross-sectional view of BB';

[0023] Figure 8 The image shown is provided in an embodiment of this application. Figure 1 Another cross-sectional view of AA';

[0024] Figure 9 The image shown is provided in an embodiment of this application. Figure 2 Another cross-sectional view of BB';

[0025] Figure 10 The image shown is provided in an embodiment of this application. Figure 2 Another cross-sectional view of BB';

[0026] Figure 11 The image shown is provided in an embodiment of this application. Figure 1 Another cross-sectional view of AA';

[0027] Figure 12 The image shown is provided in an embodiment of this application. Figure 1 Another cross-sectional view of AA';

[0028] Figure 13 The image shown is provided in an embodiment of this application. Figure 1 Another cross-sectional view of AA';

[0029] Figure 14 The image shown is provided in an embodiment of this application. Figure 2 Another cross-sectional view of BB';

[0030] Figure 15 The image shown is provided in an embodiment of this application. Figure 2 Another cross-sectional view of BB';

[0031] Figure 16 The image shown is provided in an embodiment of this application. Figure 1 Another cross-sectional view of AA';

[0032] Figure 17 The image shown is provided in an embodiment of this application. Figure 1 Another cross-sectional view of AA';

[0033] Figure 18 The diagram shown is a periodic schematic of a sub-converging grating provided in an embodiment of this application;

[0034] Figure 19 The image shown is provided in an embodiment of this application. Figure 15 A schematic diagram of a periodic pre-polarization grating;

[0035] Figure 20 The image shown is provided in an embodiment of this application. Figure 2 Another cross-sectional view of BB';

[0036] Figure 21 The image shown is provided in an embodiment of this application. Figure 2 Another cross-sectional view of BB';

[0037] Figure 22 The image shown is provided in an embodiment of this application. Figure 2Another cross-sectional view of BB';

[0038] Figure 23 The diagram shown is a schematic representation of a display device provided in an embodiment of this application. Detailed Implementation

[0039] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention.

[0040] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0041] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0042] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0043] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0044] In existing holographic 3D display devices, field lenses composed of stacked multilayer volume holographic gratings can be used to converge light. Each layer of volume holographic grating is fabricated on a substrate. After external natural light undergoes specular reflection through the multilayer substrate, it undergoes transmission diffraction through the multilayer volume holographic gratings. Due to the angle and wavelength selectivity of the volume holographic grating, the reflected light from the field lens will cause the generation of diffraction fringes. The diffraction fringes will present multiple layers of chaotic rainbow fringes, which will affect the display effect of the display device.

[0045] In view of this, the present invention provides a field lens and a display device to improve the problem of diffraction fringes affecting the display effect.

[0046] Figure 1 The image shown is a schematic diagram of a field lens provided in an embodiment of this application. Figure 2 The image shown is a stereoscopic perspective view of a field lens provided in an embodiment of this application. Figure 3 The image shown is provided in an embodiment of this application. Figure 2 Please refer to a cross-sectional view of BB'. Figures 1-3 This application provides a field lens 100, including a lens body 10 and an optical structure 20;

[0047] The mirror body 10 includes at least two layers of gratings (30 / 40). Along the direction perpendicular to the plane where the mirror body 10 is located, the mirror body 10 includes a first side F1 and a second side S2. The optical structure 20 is located on the side of the at least one layer of gratings (30 / 40) closer to the second side S2.

[0048] The optical structure 20 is used to block at least part of the visible light incident on one side of the mirror body 10 and / or to block at least part of the visible light emitted to the second side S2 of the mirror body 10 after being reflected by the grating (30 / 40).

[0049] Specifically, this application provides a field lens 100, which includes a lens body 10 and an optical structure 20. The lens body 10 may include two or more gratings (30 / 40), and each grating (30 / 40) may further include a substrate (not shown). The substrate may be made of glass, that is, the grating (30 / 40) may be made on a glass substrate; in addition, the substrate may also be made of other materials, and this application does not specifically limit this. Along the direction perpendicular to the plane of the lens body 10, the lens body 10 can be divided into a first side F1 and a second side S2. The first side F1 is the side that receives the display light, and the second side S2 is the side that emits the display light. The second side S2 is also subject to external light (visible light) entering it. This application sets the optical structure 20 to be located on the side of at least one grating (30 / 40) in the lens body 10 close to its second side S2, for example... Figure 3 As shown, the optical structure 20 can also be optionally located on the second side S2 of the entire mirror body 10.

[0050] When external light (visible light) shines from the second side S2 of the mirror 10 to the first side F1, the substrate corresponding to the grating (30 / 40) in the mirror 10 reflects this external light. This reflection is even more pronounced when the substrate is made of glass. This application addresses this by using an optical structure 20 to block some of the visible light incident on one side of the mirror 10, and / or by using the optical structure 20 to block at least a portion of the light reflected by the glass substrate included in the grating (30 / 40) towards the second side S2. This reduces the amount of visible light reflected by the grating (30 / 40) and then emitted back to the second side S2 of the mirror 10, thereby reducing the number of diffraction fringes observable by the user on the second side S2 of the mirror 10 and mitigating the impact of diffraction fringes on the display effect.

[0051] It should be noted that the optical structure 20 added to the field lens 100 can be set on the second side S2 of the entire mirror body 10, or on the second side S2 of any grating (30 / 40) in the mirror body 10, or the second side S2 of at least two different gratings (30 / 40) can include the optical structure 20. This application does not limit the number or the setting position of the optical structure 20 included in the field lens 100. Users can adjust the setting position and number of optical structures 20 according to actual needs, as long as the optical structure 20 can reduce the amount of visible light incident into the mirror body 10 and / or reduce the amount of visible light emitted to the second side of the mirror body 10 after reflection by the substrate in the mirror body 10, thereby reducing the number of diffraction fringes. Because as long as an optical structure 20 is provided on the second side S2 of any grating (30 / 40), the amount of visible light received by any grating (30 / 40) present on the first side F1 of the optical structure 20 can be reduced, and / or the amount of visible light reflected can be reduced. The amount of visible light emitted from the second side S2 of the mirror body 10 after being reflected is reduced, which can achieve the effect of reducing the diffraction fringes on the second side S2 of the field lens 100. This can reduce the impact of diffraction fringes on the display effect to a certain extent and improve the display effect of the relevant display device.

[0052] Please continue to refer to Figure 3 Optionally, the angle at which the mirror 10 diffracts visible light is θ, and the angle at which the optical structure 20 allows visible light to exit is α, where α < θ.

[0053] It should be noted that the angle θ at which visible light is diffracted by the mirror body 10 refers to the angle at which diffraction occurs when the light ray exits to one side of the mirror body 10 and the normal L; the angle α at which visible light is allowed to exit by the optical structure 20 refers to the angle at which visible light is allowed to exit by the angle between the light ray and the normal L when the light ray exits to one side of the mirror body 10. Specifically, this application also provides an optional setting where, when the angle at which visible light irradiated from the second side S2 to the first side F1 of the mirror body 10 can diffract is θ, the optical structure 20 can be optionally set to allow visible light to exit at an angle α, where α < θ. This allows the light rays reflected by the grating (30 / 40) in the mirror body 10 and emitted towards the second side S2 of the mirror body 10 to be blocked by the optical structure 20. When visible light irradiates the mirror body 10 from the second side S2, the visible light cannot be reflected by the grating (30 / 40) in the mirror body 10 and then emitted towards the second side S2 of the mirror body 10. In other words, no diffracted light will appear on the second side S2 of the mirror body 10, thus eliminating the influence of diffraction stripes on the display effect and improving the display effect of the relevant display device.

[0054] Please continue to refer to Figure 3Optionally, the minimum angle at which the mirror 10 diffracts visible light is A, where α < A.

[0055] It should be noted that the minimum angle A for visible light diffraction by the mirror 10 refers to the minimum angle at which diffraction occurs between the light ray and the normal L when the light ray exits to one side of the mirror 10. Specifically, this application also provides an optional setting where, when the minimum angle for visible light diffraction by the mirror 10 is A, as long as the optical structure 20 allows the angle of visible light exit to be less than A, the light rays emitted to the second side S2 of the mirror 10 after reflection by the grating (30 / 40) in the mirror 10 can be blocked by the optical structure 20. When visible light shines on the mirror 10 from the second side S2, the visible light cannot be reflected by the grating (30 / 40) in the mirror 10 and then exit to the second side S2 of the mirror 10. That is, no diffracted light rays will appear on the second side S2 of the mirror 10, thus eliminating the influence of diffraction fringes on the display effect and improving the display effect of the relevant display device.

[0056] Figure 4 The image shown is provided in an embodiment of this application. Figure 1 Please refer to a cross-sectional view of AA'. Figure 3 and Figure 4 It should be noted that the minimum diffraction angle A of the first grating 40 for visible light refers to the minimum angle at which diffraction occurs between the light ray and the normal L corresponding to the substrate of the first grating 40 when the light ray exits towards one side of the mirror body 10; the minimum diffraction angle K of the second grating 30 for visible light refers to the minimum angle at which diffraction occurs between the light ray and the normal L corresponding to the substrate of the second grating 30 when the light ray exits towards one side of the mirror body 10. An alternative embodiment is provided here, for example, when the mirror body 10 includes a first grating 40 and a second grating 30 sequentially arranged along the direction from the first side F1 to the second side S2, if the minimum diffraction angle of the first grating 40 for visible light is A and the minimum diffraction angle of the second grating 30 for visible light is K, and A is less than K, then... Figure 4 As shown, if the optical structure 20 is positioned between the first grating 40 and the second grating 30, the optical structure 20 can be configured to only block the light reflected from the first grating 40 from escaping to the second side S2 of the mirror body 10. This can be achieved simply by setting the angle α that allows visible light to exit the optical structure 20 to be less than A. Figure 3As shown, if the optical structure 20 is positioned on the side of the second grating 30 away from the first grating 40, and the angle α < K for visible light emission is set, it can only block the light reflected from the second grating 30 from escaping to the second side S2 of the mirror body 10. However, for the first grating 40, it can only block a portion of the light reflected from the first grating 40 from escaping to the second side S2 of the mirror body 10. If it is desired to simultaneously block the light reflected from both the first grating 40 and the second grating 30 from escaping to the second side S2 of the mirror body 10... If the optical structure 20 is set to allow visible light to exit at an angle α < A, since A is less than K, setting α < K can only block some light rays from being reflected and exiting to the second side S2 of the mirror 10. If α < A is set, all light rays can be blocked from being reflected and exiting to the second side S2 of the mirror 10. That is, as long as the optical structure 20 can block the diffracted light rays at the smallest angle that diffracts visible light, it can also block other light rays that want to exit from the second side S2 of the mirror 10 after being reflected by the grating.

[0057] Figure 5 The diagram shown is a schematic representation of an optical structure provided in an embodiment of this application. Please refer to it. Figures 3-5 Optionally, the optical structure 20 includes a light-limiting layer 21, which includes a plurality of light-shielding portions 211 and light-transmitting portions 212 arranged alternately along a first direction Z1; the first direction Z1 is a direction perpendicular to the first side F1 and pointing to the second side S2.

[0058] Specifically, this application provides an optional configuration in which the optical structure 20 provided in this application may include a light limiting layer 21, in which a plurality of light-shielding parts 211 and light-transmitting parts 212 may be provided, and the light-shielding parts 211 and light-transmitting parts 212 may be alternately arranged in a direction perpendicular to the first side F1 and pointing to the second side S2. The light-shielding part 211 can be used to block part of the incident light that enters from the second side S2 of the mirror body 10 to the first side F1, and / or the light-shielding part 211 can be used to block the reflected light that enters from the second side S2 of the mirror body 10 to the first side F1 after being reflected by the grating (30 / 40) in the mirror body 10 and then exits to the second side S2, thereby reducing the number of diffraction fringes appearing on the second side S2 of the mirror body 10 and improving the display effect of the related display device; the light-transmitting part 212 can be used to allow the light from the first side F1 of the mirror body 10 to pass through, so as to ensure the normal display function of the related display device and avoid the influence of the light-limiting layer 21 on the normal display effect of the related display device.

[0059] Please refer to Figures 3-5Optionally, the spacing d between at least some of the light-shielding parts 211 that are arranged adjacently is the same, and the height h of at least some of the light-shielding parts 211 is the same along the direction from the first side F1 to the second side S2.

[0060] Specifically, this application also provides an optional configuration method in which the optical structure 20 includes a light limiting layer 21. When the light limiting layer 21 includes light-shielding portions 211 and light-transmitting portions 212 alternately arranged along the first direction Z1, the spacing d between at least some of the adjacent light-shielding portions 211 can be set to be the same. Alternatively, the height h of at least some of the light-shielding portions 211 can be set to be the same along the direction from the first side F1 to the second side S2. Furthermore, it can be further configured that the height h of all the light-shielding portions 211 included in the light limiting layer 21 is the same, and the spacing d between any two adjacent light-shielding portions 211 is the same.

[0061] Please continue to refer to Figures 3-5 Optionally, the distance between two adjacent light-shielding parts 211 is d, the direction is from the first side F1 to the second side S2, the height of the light-shielding part 211 is h, and the angle at which the optical structure 20 allows visible light to be emitted is α, where α = (1 / 2)*arctan(h / d).

[0062] Specifically, since the height h and spacing d of the light-shielding parts 211 control the angle β of light emitted from its first side F1 to its second side S2, when the height h is equal, a smaller spacing d results in a relatively smaller angle β, and a larger spacing d results in a relatively larger angle β; conversely, when the spacing d is equal, a smaller height h results in a relatively larger angle β, and a larger height h results in a relatively smaller angle β. Therefore, by setting all the light-shielding parts 211 in the light-limiting layer 21 to have the same height h and spacing d, uniform control of the angle β of light emitted from the first side F1 to its second side S2 of the light-limiting layer 21 can be achieved. The angle α that the optical structure 20 allows visible light to exit refers to the angle formed between the light ray and the normal L when the light ray exits towards the mirror body 10. Therefore, the value of α is half of the angle β.

[0063] In summary, the size of α can be adjusted by adjusting d and h. Therefore, this application also provides an optional setting method where any d and any h in the light limiting layer 21 are equal, that is, the distance between any two adjacent light-shielding parts 211 is d. Along the direction from the first side F1 to the second side S2, the height of any light-shielding part 211 is h. Specifically, the calculation method for the angle at which visible light can be emitted by the optical structure 20 is α = (1 / 2) * arctan(h / d). The angle α at which visible light can be emitted by the optical structure 20 is equivalent to half of the aforementioned viewing angle β. As can be seen from the above formula, when h is constant, a smaller distance d results in a smaller viewing angle β, and a larger distance d results in a larger viewing angle β; when d is constant, a smaller height h results in a larger viewing angle β, and a larger height h results in a smaller viewing angle β. In one of the alternative embodiments provided in this application, the value of the spacing d can be between 100μm and 1mm. If the spacing d is greater than 1mm, the amount of light that can be blocked by the light shield will be greatly reduced, making it difficult to achieve the desired effect of reducing diffraction fringes. If the spacing d is less than 100μm, the display light may not be able to pass through the optical structure 20 normally and be emitted to the user side, and the user will not be able to see the required display image, affecting the display effect of the corresponding display device.

[0064] It should be added that the light-limiting layer 21 can be specifically presented as a venetian blind structure, the spacing d is the spacing between the slats in the venetian blind, and the height h is the thickness of the venetian blind. Figure 6 The diagram shown is another structural schematic of the optical structure provided in this application embodiment. Please refer to... Figure 3 , Figure 4 and Figure 6 This application also provides an alternative configuration in which, in addition to the light limiting layer 21, the optical structure 20 may further include a polyethylene terephthalate (PET) layer 213 disposed on the light limiting layer 21 facing the first side F1. The PET layer 213 may be bonded and fixed to the light limiting layer 21 by adhesive 214. It may also further include a polycarbonate (PC) layer 215 disposed on the second side S2 of the light limiting layer 21, and an anti-glare hard coating 216 disposed on the side of the PC layer 215 away from the light limiting layer 21, so as to make the display effect of the corresponding display device better.

[0065] It should also be noted that the light-shielding portion 211 in the light-limiting layer 21 can be Figure 5 The sheet-like shape shown can also be Figure 6 The block shape shown is not specifically limited in this application.

[0066] Please combine Figure 3 and Figure 4 Reference Figure 5 and Figure 6Optionally, the material used to make the light-shielding part 211 is a light-absorbing material.

[0067] Specifically, this application also provides an optional configuration method in which the light-shielding part 211 provided in the light-limiting layer 21 can be made of a light-absorbing material. The light-shielding part 211 made of a light-absorbing material can not only block the incident and outgoing paths of light, but also absorb the light that shines on the surface of the light-shielding part 211, so as to avoid some light being reflected again. This can improve the blocking effect of the light-limiting layer 21 on some visible light incident into the mirror body 10, and can also provide the light-limiting layer 10 with a specific blocking effect on the diffracted light reflected to the second side S2 of the mirror body 10 after being reflected by the grating (30 / 40) in the mirror body 10. This can reduce or eliminate diffraction stripes, which is beneficial to improving the display effect of the related display device. Furthermore, the light-transmitting portion 212 in the light-limiting layer 21 may be presented as a hollow portion without any filling material, so as to avoid the influence of the filling material on the light transmittance of the light-transmitting portion 212. This application is not limited to this. For example, it is also possible to fill the light-transmitting portion 212 with some filling material with very high light transmittance, so as to avoid the existence of gaps in the light-limiting layer 21 and improve the structural stability of the light-limiting layer 21.

[0068] Figure 7 The image shown is provided in an embodiment of this application. Figure 2 For another cross-sectional view of BB', please refer to Figure 2 , Figure 5 and Figure 7 Optionally, the plane of at least one light-shielding part 211 is perpendicular to the plane of at least one grating (30 / 40).

[0069] Specifically, this application also provides an optional configuration whereby the optical structure 20 includes a light-limiting layer 21. When the light-limiting layer 21 includes light-shielding portions 211 and light-transmitting portions 212 alternately arranged along the first direction Z1, at least a portion of the plane containing the light-shielding portions 211 can be configured to be perpendicular to the plane containing the grating (30 / 40). If the plane containing the light-shielding portions 211 is not perpendicular to the plane containing the grating (30 / 40), although some visible light incident towards the mirror body 10 can be blocked and / or reflected by the grating (30 / 40) and then irradiated onto the light-shielding portions 211... The light on the surface will be blocked, which can reduce the number of diffraction fringes, but at the same time it will also block some of the light used for display, which will affect the display effect of the corresponding display device. Therefore, it is possible to set all the light-shielding parts 211 in the light-limiting layer 21 to be perpendicular to the plane of the grating (30 / 40). On this basis, the distance between any two adjacent light-shielding parts 211 can be set to be d, and the height of any light-shielding part 211 can be h, so as to achieve uniform control of the light angle emitted from the first side F1 of the light-limiting layer 21 to its second side S2.

[0070] It should be noted that since the light limiting layer 21 includes a light shielding part 211, light rays that strike the surface of the light shielding part 211 from any direction will be blocked. For example, when some light rays with a relatively large incident angle are incident from the outside (second side S2) toward the light limiting layer 21, they will be blocked and absorbed by the light shielding part 211, thereby preventing large-angle light rays from incident toward the mirror body 10. Therefore, these light rays will not be reflected by the substrates of the first grating 40 and the second grating 30, which can reduce the number of diffraction fringes formed after the incident light is reflected by the substrates of the first grating 40 and the second grating 30, thereby improving the display effect of the related display device.

[0071] Please refer to Figure 7 Optionally, along the direction from the first side F1 to the second side S2, the mirror body 10 includes a pre-polarizing grating 40 and a converging grating 30 stacked together.

[0072] Specifically, this application also provides an optional configuration method in which, along the direction from the first side F1 of the mirror body 10 to the second side S2, the mirror body 10 may include a pre-polarizing grating 40 and a converging grating 30 stacked together. The pre-polarizing grating 40 can be used to pre-polarize the display laser emitted by the display light source on the first side F1 of the mirror body 10, and the converging grating 30 can be used to converge the display laser emitted by the display light source on the first side F1 of the mirror body 10. Through the cooperation of the pre-polarizing grating 40 and the converging grating 30, the convergence of the modulated display laser can be realized, so as to realize the display function of the display laser on the second side S2 of the mirror body 10.

[0073] This application does not impose specific limitations on the number of pre-polarizing gratings 40 and converging gratings 30 included in the lens body 10. Users can adjust the number of pre-polarizing gratings 40 and converging gratings 30 included in the lens body 10 according to their needs.

[0074] It should be added that the converging grating 30 acts as a lens. The difference from a conventional lens is that when the converging grating includes multiple sub-converging gratings, each sub-converging grating can be used to converge only one wavelength of light. However, since there are light rays that are incident on the converging grating 30 in a direction perpendicular to the plane where the converging grating 30 is located, the converging grating 30 is not effective at converging such light rays. Therefore, by setting a pre-polarizing grating 40 to deflect this part of the light rays at a small angle, and then using the converging grating 30 to converge the light rays, the converging effect of the lens body 10 on the light rays can be improved.

[0075] Please continue to refer to Figure 7 Optionally, the optical structure 20 is located on the side of the converging grating 30 away from the pre-polarizing grating 40.

[0076] Specifically, this application also provides an optional configuration in which, when the mirror body 10 includes a pre-polarizing grating 40 and a converging grating 30, the optical structure 20 can be located on the side of the converging grating 30 away from the pre-polarizing grating 40. In this case, along the direction from the first side F1 of the mirror body 10 to the second side S2, the film structure of the mirror body 10 and the optical structure 20 is sequentially configured as the pre-polarizing grating 40, the converging grating 30, and the optical structure 20. With this configuration, when light shines on one side of the mirror body 10 from the second side S2, some of the incident light can be blocked by the optical structure 20, and / or some of the incident light is reflected by the converging grating 30 and then reflected by the pre-polarizing grating 40. The optical structure 20 has a certain light-shielding effect on the light reflected by the pre-polarizing grating 40 and the converging grating 30, thereby reducing the number of diffraction fringes appearing on the second side S2 of the mirror body 10 and improving the display effect of the related display device.

[0077] Figure 8 The image shown is provided in an embodiment of this application. Figure 1 For another cross-sectional view of AA', please refer to... Figure 1 , Figure 5 and Figure 8 Optionally, the optical structure 20 is located between the converging grating 30 and the pre-polarizing grating 40.

[0078] Specifically, this application also provides an optional configuration where, when the mirror body 10 includes a pre-polarizing grating 40 and a converging grating 30, the optical structure 20 can be positioned between the converging grating 30 and the pre-polarizing grating 40. In this case, along the direction from the first side F1 of the mirror body 10 to the second side S2, the film structure of the mirror body 10 and the optical structure 20 is sequentially configured as the pre-polarizing grating 40, the optical structure 20, and the converging grating 30. In this case, when visible light is incident from the second side S2 of the mirror body 10 towards the first side F1, the optical structure 20 can block at least a portion of the visible light from entering the pre-polarizing grating 40. Furthermore, considering that the light irradiated to the second side S2 of the mirror body 10 by the pre-polarizing grating 40 in the mirror body 10 is specularly reflected, when the optical structure 20 is set on the side of the pre-polarizing grating 40 facing the converging grating 30, the optical structure 20 can also be used to have a certain light-shielding effect on the light reflected by the pre-polarizing grating 40. By setting the optical structure 20, the amount of light emitted to the second side S2 after being reflected by the pre-polarizing grating 40 is reduced, thereby reducing the number of diffraction fringes appearing on the second side S2 of the mirror body 10 and improving the display effect of the related display device.

[0079] It should be added that when the mirror body 10 includes a stacked converging grating 30 and a pre-polarizing grating 40, the diffraction fringes are mainly caused by the specular reflection of light incident from the second side S2 of the mirror body 10 by the pre-polarizing grating 40. Therefore, for the light reflected by the grating that the optical structure 20 needs to block, it can be mainly considered that the optical structure 20 is used to block the light reflected by the pre-polarizing grating 40. Of course, it is also possible to further consider using the optical structure 20 to simultaneously block the light reflected by the converging grating 30. This application does not make specific limitations in this regard. Users can choose the setting position of the optical structure 20 according to their own needs to reduce the diffraction fringes appearing on the second side S2 of the mirror body 10.

[0080] Figure 9 The image shown is provided in an embodiment of this application. Figure 2 For another cross-sectional view of BB', please refer to Figure 2 , Figure 7 and Figure 9 Optionally, along the direction from the first side F1 to the second side S2, the converging grating 30 includes a plurality of sub-converging gratings 31 stacked together, the plurality of sub-converging gratings 31 including a first sub-converging grating 311, a second sub-converging grating 312, and a third sub-converging grating 313;

[0081] Along the direction from the first side F1 to the second side S2, the pre-polarization grating 40 includes a plurality of sub-pre-polarization gratings 41 stacked together, including a first sub-pre-polarization grating 411, a second sub-pre-polarization grating 412, and a third sub-pre-polarization grating 413.

[0082] Specifically, this application also provides an optional configuration in which, along the direction from the first side F1 of the mirror body 10 to its second side S2, the converging grating 30 in the mirror body 10 may include two or more layers of sub-converging gratings 31, for example, it may specifically include three layers of sub-converging gratings 31, specifically a first sub-converging grating 311, a second sub-converging grating 312, and a third sub-converging grating 313; at the same time, along the direction from the first side F1 of the mirror body 10 to its second side S2, the pre-polarizing grating 40 in the mirror body 10 may also be configured to include two or more layers of sub-pre-polarizing gratings 41, for example, it may specifically include three layers of sub-pre-polarizing gratings 41, specifically a first sub-pre-polarizing grating 411, a second sub-pre-polarizing grating 412, and a third sub-pre-polarizing grating 413.

[0083] Figure 10 The image shown is provided in an embodiment of this application. Figure 2 For another cross-sectional view of BB', please refer to Figure 2 and Figure 10 Since the pre-polarizing grating 40 can be used to pre-polarize the display laser emitted by the display light source on the first side F1 of the mirror body 10, and the converging grating 30 can be used to converge the display laser emitted by the display light source on the first side F1 of the mirror body 10, the pre-polarizing grating 40 and the converging grating 30 can be used to converge the modulated display laser, so as to realize the display function of the display laser on the second side S2 of the mirror body 10. When the display laser includes three different colors, one sub-pre-polarizing grating 41 and one sub-converging grating 31 can be used to converge and display one color of display laser, and the other two colors of display laser can be converged and displayed through the other two sets of sub-pre-polarizing gratings 41 and sub-converging gratings 31.

[0084] Figure 11 The image shown is provided in an embodiment of this application. Figure 1 For another cross-sectional view of AA', please refer to... Figure 1 and Figure 11 Optionally, the optical structure 20 is located between two adjacent sub-pre-polarization gratings 41.

[0085] Specifically, this application also provides an optional configuration method where, when the mirror body 10 includes two or more layers of sub-pre-polarization gratings 41, the optical structure 20 can be optionally positioned between two adjacent sub-pre-polarization gratings 41, for example... Figure 11As shown, when the pre-polarization grating 40 includes a first sub-pre-polarization grating 411, a second sub-pre-polarization grating 412, and a third sub-pre-polarization grating 413 arranged layer by layer along the first side F1 to the second side S2 of the mirror body 10, the optical structure 20 can be disposed between the second sub-pre-polarization grating 412 and the third sub-pre-polarization grating 413. Then, the optical structure 20 can be used to block part of the visible light irradiation toward the first sub-pre-polarization grating 411 and the second sub-pre-polarization grating 412, and / or the optical structure 20 can be used to block part of the light rays that are reflected by the first sub-pre-polarization grating 411 and the second sub-pre-polarization grating 412 and emitted toward the second side S2 of the mirror body 10, thereby reducing the number of diffraction fringes appearing on the second side S2 of the mirror body 10 and improving the display effect of the related display device.

[0086] Figure 12 The image shown is provided in an embodiment of this application. Figure 1 Another cross-sectional view of AA'. Figure 13 The image shown is provided in an embodiment of this application. Figure 1 For another cross-sectional view of AA', please refer to... Figure 1 , Figure 12 and Figure 13 Furthermore, for example, when the pre-polarization grating 40 includes a first sub-pre-polarization grating 411, a second sub-pre-polarization grating 412, and a third sub-pre-polarization grating 413 arranged layer by layer along the first side F1 to the second side S2 of the mirror body 10, the optical structure 20 can be disposed between the first sub-pre-polarization grating 411 and the second sub-pre-polarization grating 412. In this case, the optical structure 20 can be used to block part of the visible light irradiation toward the first sub-pre-polarization grating 411 and one side, and / or the optical structure 20 can be used to block part of the light rays reflected by the first sub-pre-polarization grating 411 and emitted toward the second side S2 of the mirror body 10, thereby reducing the number of diffraction fringes appearing on the second side S2 of the mirror body 10 and improving the display effect of the related display device.

[0087] It should be added that this application does not limit the inclusion of an optical structure 20 between multiple gratings, nor does it limit the specific placement of the optical structure 20, as long as the optical structure 20 can be placed on the second side S2 of at least one sub-pre-polarization grating 41 facing the mirror body 10, to block some visible light from illuminating at least one sub-pre-polarization grating 41, and / or to block light that may form diffraction fringes after being reflected by at least one sub-pre-polarization grating 41; in addition, such as Figure 13As shown, multiple optical structures 20 can also be arranged between two different but adjacent gratings. For example, when the pre-polarization grating 40 includes a first sub-pre-polarization grating 411, a second sub-pre-polarization grating 412, and a third sub-pre-polarization grating 413 arranged layer by layer along the first side F1 to the second side S2 of the mirror body 10, an optical structure 20 can be arranged between the first sub-pre-polarization grating 411 and the second sub-pre-polarization grating 412. Alternatively, another optical structure 20 can be arranged between the second sub-pre-polarization grating 412 and the third sub-pre-polarization grating 413. In this case, the optical structure 20 arranged between the second sub-pre-polarization grating 412 and the third sub-pre-polarization grating 413 can be arranged in a layered manner. The optical structure 20 between the three sub-pre-polarization gratings 413 can block some visible light incident towards the second sub-pre-polarization grating 412 and the first sub-pre-polarization grating 411, and / or can block some light rays reflected by the second sub-pre-polarization grating 412 and the first sub-pre-polarization grating 411 and emitted towards the second side S2. Simultaneously, the optical structure 20 disposed between the first sub-pre-polarization grating 411 and the second sub-pre-polarization grating 412 can block some visible light emitted towards the first sub-pre-polarization grating 411, and / or can block some light rays reflected by the first sub-pre-polarization grating 411 and emitted towards the second side S2. Furthermore, it is also possible to... Figure 13 Based on the embodiment shown, an optical structure 20 is also provided on the second side S2 of the third sub-pre-polarization grating 413. This application does not make specific limitations on this. Users can select the number and position of the optical structures 20 included in the lens body 10 according to their needs.

[0088] It should also be added that, such as Figure 13 As shown, in the optical structures 20 set at different positions, the distance between two adjacent light-shielding parts 211 is d, and the height of the light-shielding part 211 is h. These can be adjusted according to requirements. This application does not limit the physical properties of the optical structures 20 set in a single mirror body 10 to be completely identical. Users can adjust the values ​​of d and h according to the angle α that the optical structure 20 is allowed to emit visible light. For example, when the color of the light to be blocked is different, the values ​​of d and h of the corresponding optical structures 20 can be set to be different.

[0089] Furthermore, when multiple optical structures 20 are arranged between different gratings, an alternative embodiment can be provided, in which the pre-polarization grating 40 includes a first sub-pre-polarization grating 411, a second sub-pre-polarization grating 412, and a third sub-pre-polarization grating 413 arranged layer by layer along the first side F1 to the second side S2 of the mirror body 10, and the converging grating 30 includes a first sub-converging grating 311, a second sub-converging grating 312, and a third sub-converging grating 313 arranged layer by layer along the first side F1 to the second side S2 of the mirror body 10. One layer of optical structure 20 can be arranged between the second sub-pre-polarization grating 412 and the third sub-pre-polarization grating 413, and another layer of optical structure 20 can be arranged between the first sub-converging grating 311 and the second sub-converging grating 312, and so on.

[0090] That is, users can adjust the number of sub-pre-polarization gratings 41 and sub-converging gratings 31 included in the mirror body 10 according to actual needs. They can also adjust the number and position of optical structures 20 according to actual needs, as long as the optical structures 20 can be used to reduce the number of diffraction fringes appearing on the second side S2 of the mirror body 10 and improve the display effect of the relevant display device.

[0091] Please refer to Figure 10 Optionally, the light rays that can pass through the mirror body 10 and the optical structure 20 along the direction from the first side F1 to the second side S2 of the mirror body 10 include a first color ray 51, a second color ray 52 and a third color ray 53.

[0092] The first sub-converging grating 311 and the first sub-pre-polarizing grating 411 are used to deflect the first color light 51, the second sub-converging grating 312 and the second sub-pre-polarizing grating 412 are used to deflect the second color light 52, and the third sub-converging grating 313 and the third sub-pre-polarizing grating 413 are used to deflect the third color light 53.

[0093] Specifically, this application provides an optional embodiment in which the light rays passing through the mirror body 10 and the optical structure 20 along the direction from the first side F1 to the second side S2 of the mirror body 10 can specifically be the display laser in the display device corresponding to the field lens 100. This display laser can, for example, include light rays of three colors: a first color ray 51, a second color ray 52, and a third color ray 53. When the mirror body 10 is provided with a first sub-converging grating 311, a second sub-converging grating 312, a third sub-converging grating 313, and a first sub-pre-polarizing grating 411, a second sub-pre-polarizing grating 412, and a third sub-pre-polarizing grating 413, it can be specifically configured such that, along the direction from the first side F1 to the second side S2 of the mirror body 10, the first sub-pre-polarizing grating 411, the second sub-pre-polarizing grating 412, and the third sub-pre-polarizing grating 413 are... 3. The first sub-converging grating 311, the second sub-converging grating 312, and the third sub-converging grating 313 are arranged sequentially. At this time, the first sub-converging grating 311 and the first sub-pre-polarizing grating 411 can be selected to deflect the first color light 51, so as to realize the convergence and emission of the first color light 51 by the mirror body 10. The second sub-converging grating 312 and the second sub-pre-polarizing grating 412 are used to deflect the second color light 52, so as to realize the convergence and emission of the second color light 52 by the mirror body 10. The third sub-converging grating 313 and the third sub-pre-polarizing grating 413 are used to deflect the third color light 53, so as to realize the convergence and emission of the third color light 53 by the mirror body 10. This achieves the convergence and display of the display laser, ensuring the good display effect of the display device corresponding to the field mirror 100.

[0094] Figure 14 The image shown is provided in an embodiment of this application. Figure 2 For another cross-sectional view of BB', please refer to Figure 2 , Figure 10 and Figure 14 , Figure 14 and Figure 10 The difference is that the first sub-converging grating 311 is located on the side of the second sub-converging grating 312 away from the pre-polarizing grating 40. Optionally, the first sub-converging grating 311 is located on the side of the first sub-pre-polarizing grating 411 away from the first side F1, the second sub-converging grating 312 is located on the side of the second sub-pre-polarizing grating 412 away from the first side F1, and the third sub-converging grating 313 is located on the side of the third sub-pre-polarizing grating 413 away from the first side F1.

[0095] Specifically, this application also provides an optional configuration whereby the mirror body 10 is provided with a first sub-converging grating 311, a second sub-converging grating 312, a third sub-converging grating 313, and a first sub-pre-polarizing grating 411, a second sub-pre-polarizing grating 412, and a third sub-pre-polarizing grating 413, wherein the first sub-converging grating 311 and the first sub-pre-polarizing grating 411 are used to deflect the first color light 51, the second sub-converging grating 312 and the second sub-pre-polarizing grating 412 are used to deflect the second color light 52, and the third sub-converging grating 313 and the third sub-pre-polarizing grating 413 are used to deflect the second color light 52. When the three-color light rays 53 are deflected, the first sub-converging grating 311 can be further set to be located away from the first side F1 of the first sub-pre-polarizing grating 411, the second sub-converging grating 312 can be located away from the first side F1 of the second sub-pre-polarizing grating 412, and the third sub-converging grating 313 can be located away from the first side F1 of the third sub-pre-polarizing grating 413. In this way, the corresponding converging grating 30 is set away from the first side F1 of the mirror body 10 in the two gratings used to converge the same color light rays. Only with this setting can the light convergence effect be achieved and the corresponding display device achieve a good display effect.

[0096] That is, this application does not limit the direction from the first side F1 to the second side S2 to the arrangement of the first sub-pre-polarization grating 40, the second sub-pre-polarization grating 411, the second sub-pre-polarization grating 412, and the third sub-pre-polarization grating 413 arranged in sequence. The arrangement positions of the first sub-pre-polarization grating 411, the second sub-pre-polarization grating 412, and the third sub-pre-polarization grating 413 can be arbitrarily switched. Correspondingly, this application does not limit the direction from the first side F1 to the second side S2 to the arrangement of the first sub-converging grating 30, the second sub-converging grating 311, the second sub-converging grating 312, and the third sub-converging grating 313 arranged in sequence. The arrangement positions of the first sub-converging grating 311, the second sub-converging grating 312, and the third sub-converging grating 313 can be arbitrarily switched. As long as it is ensured that in the two gratings used to converge the same color light, the corresponding converging grating 30 is located on the first side F1 of the pre-polarization grating 40 away from the mirror body 10.

[0097] Furthermore, when the mirror body 10 includes a convergence grating 30 and a pre-polarization grating 40 stacked together, the diffraction fringes are mainly caused by the specular reflection of light from the second side S2 of the mirror body 10 by the pre-polarization grating 40. Therefore, for the light reflected by the grating that the optical structure 20 is to block, the optical structure 20 can be mainly considered to block the light reflected by the pre-polarization grating 40. Therefore, in the grating for converging light of the same color, the corresponding convergence grating 30 can be set on the first side F1 of the pre-polarization grating 40 away from the mirror body 10.

[0098] Figure 15 The image shown is provided in an embodiment of this application. Figure 2 For another cross-sectional view of BB', please refer to Figure 2 , Figure 10 , Figure 14 and Figure 15 Optionally, along the direction from the first side F1 to the second side S2, the converging grating 30 includes a plurality of sub-converging gratings 31 stacked together, the plurality of sub-converging gratings 31 including a first sub-converging grating 311, a second sub-converging grating 312, and a third sub-converging grating 313;

[0099] The light rays that can pass through the mirror body 10 and the optical structure 20 along the direction from the first side F1 to the second side S2 include the first color ray 51, the second color ray 52 and the third color ray 53;

[0100] The first sub-converging grating 311 and the pre-polarizing grating 40 are used to deflect the first color light 51, the second sub-converging grating 312 and the pre-polarizing grating 40 are used to deflect the second color light 52, and the third sub-converging grating 313 and the pre-polarizing grating 40 are used to deflect the third color light 53.

[0101] Specifically, this application also provides an optional configuration in which, along the direction from the first side F1 to the second side S2 of the lens body 10, the converging grating 30 can be configured to include two or more layers of sub-converging gratings 31 stacked together. For example, it can specifically include a first sub-converging grating 311, a second sub-converging grating 312, and a third sub-converging grating 313 arranged sequentially along the direction from the first side F1 to the second side S2; and simultaneously, it can be optionally configured that the pre-polarizing grating 40 includes only a single-layer pre-polarizing grating 40, and does not include multi-layered sub-pre-polarizing gratings 41. That is, in this embodiment provided by this application, the lens body 10 may only include 4 layers of grating structure, namely, the first sub-converging grating 311, the second sub-converging grating 312, the third sub-converging grating 313, and the pre-polarizing grating 40 arranged sequentially along the direction from the first side F1 to the second side S2.

[0102] When the light rays passing through the mirror body 10 and the optical structure 20 along the direction from the first side F1 to the second side S2 include the first color light 51, the second color light 52, and the third color light 53, a first sub-converging grating 311 and a pre-polarizing grating 40 can be set to deflect and converge the first color light 51, so as to realize the converged emission of the first color light 51 by the mirror body 10. A second sub-converging grating 312 and a pre-polarizing grating 40 can be set to deflect and converge the second color light 52, so as to realize the converged emission of the second color light 52 by the mirror body 10. A third sub-converging grating 313 and a pre-polarizing grating 40 can be set to deflect and converge the third color light 53, so as to realize the converged emission of the third color light 53 by the mirror body 10. This achieves the converged display of the display laser and ensures the good display effect of the display device corresponding to the field mirror 100.

[0103] The above-described embodiment provides a configuration that enables the mirror body 10 to converge and display three colors of laser light, while also ensuring that the mirror body 10 is as thin as possible. This avoids the complexity of the overall manufacturing process of the display device corresponding to the field lens 100 and prevents the display device from being too thick or heavy, thus improving the thinness and lightness of the corresponding display device.

[0104] It should also be added that when the above embodiment only includes a single-layer pre-polarization grating 40, the pre-polarization grating 40 can be configured as three pre-polarization gratings 40 with different periods spatially superimposed together. These three periods are specifically a first period for pre-polarizing the first color light 51, a second period for pre-polarizing the second color light 52, and a third period for pre-polarizing the third color light 53. It should be noted that the pre-polarization grating 40 formed by superimposing these three periods is not a grating with a fixed period.

[0105] Figure 16 The image shown is provided in an embodiment of this application. Figure 1 Another cross-sectional view of AA'. Figure 17 The image shown is provided in an embodiment of this application. Figure 1 For another cross-sectional view of AA', please refer to... Figure 1 , Figure 16 and Figure 17 Optionally, the optical structure 20 is located between two adjacent sub-converging gratings 31.

[0106] Specifically, this application also provides an optional configuration where, when the converging grating 30 includes a first sub-converging grating 311, a second sub-converging grating 312, and a third sub-converging grating 313, the optical structure 20 can be positioned between any two adjacent sub-converging gratings 31, for example... Figure 16As shown, the optical structure 20 can be optionally positioned between the first sub-converging grating 311 and the second sub-converging grating 312, such as... Figure 17 As shown, the optical structure 20 can also be optionally located between the second sub-converging grating 312 and the third sub-converging grating 313; alternatively, one optical structure 20 can be optionally located between the first sub-converging grating 311 and the second sub-converging grating 312, and another optical structure 20 can be optionally located between the second sub-converging grating 312 and the third sub-converging grating 313.

[0107] like Figure 16 As shown, when the first sub-converging grating 311, the second sub-converging grating 312, and the third sub-converging grating 313 are sequentially arranged along the direction from the first side F1 to the second side S2 of the mirror body 10, and the optical structure 20 is located between the first sub-converging grating 311 and the second sub-converging grating 312, the optical structure 20 can be used to block part of the visible light incident on the first sub-converging grating 311 and the pre-polarizing grating 40. Simultaneously, the optical structure 20 can also be used to block part of the reflected light rays that are reflected by the first sub-converging grating 311 and the pre-polarizing grating 40 and then emitted towards the second side S2 of the mirror body 10; Figure 17 As shown, when the first sub-converging grating 311, the second sub-converging grating 312, and the third sub-converging grating 313 are arranged sequentially along the direction from the first side F1 of the mirror body 10 to the second side S2, and the optical structure 20 is located between the second sub-converging grating 312 and the third sub-converging grating 313, the optical structure 20 can be used to block part of the visible light incident on the first sub-converging grating 311, the second sub-converging grating 312, and the pre-polarizing grating 40, and / or the optical structure 20 can also be used to block part of the reflected light emitted towards the second side S2 of the mirror body 10 after being reflected by the first sub-converging grating 311, the second sub-converging grating 312, and the pre-polarizing grating 40, thereby reducing the number of diffraction fringes appearing on the second side S2 of the mirror body 10 and improving the display effect of the related display device.

[0108] Figure 18 The diagram shown is a periodic schematic of a sub-converging grating provided in an embodiment of this application. Please refer to... Figure 18 Optionally, the period T of the sub-converging grating 31 is a gradually changing period T;

[0109] Along the thickness direction perpendicular to the sub-converging grating 31, the period T of the sub-converging grating 31 gradually increases from the edge to the middle.

[0110] Specifically, this application also provides an optional setting method in which the period T of any sub-converging grating 31 can be set to a gradually increasing period T. Specifically, along the direction perpendicular to the thickness of the sub-converging grating 31, that is, along the direction of the plane where the sub-converging grating 31 is located, the period T of the sub-converging grating 31 can be set to gradually increase from the edge to the middle. The denser the period T, the stronger the light refraction ability. This enables the sub-converging grating 31 to converge light that hits the edge of the sub-converging grating 31 to the corresponding display position with stronger converging ability, thereby achieving the effect of converging light and improving the display effect of the corresponding display device.

[0111] Figure 19 The image shown is provided in an embodiment of this application. Figure 15 A schematic diagram of a periodic pre-polarization grating is shown below. Figure 15 and Figure 19 , Figure 19 The pre-polarizing grating 40 shown is formed by the spatial superposition of a first sub-pre-polarizing grating 411, a second sub-pre-polarizing grating 412, and a third sub-pre-polarizing grating 413; optionally, the plurality of pre-polarizing gratings 40 include a first sub-pre-polarizing grating 411 for deflecting a first color ray 51, a second sub-pre-polarizing grating 412 for deflecting a second color ray 52, and a third sub-pre-polarizing grating 413 for deflecting a third color ray 53;

[0112] Along a direction perpendicular to the first side F1 and pointing to the second side S2, the first sub-pre-polarization grating 411, the second sub-pre-polarization grating 412, and the third sub-pre-polarization grating 413 are arranged on the same layer.

[0113] Specifically, this application also provides an optional configuration method in which, when the lens body 10 includes a first sub-pre-polarizing grating 411 for deflecting the first color light 51, a second sub-pre-polarizing grating 412 for deflecting the second color light 52, and a third sub-pre-polarizing grating 413 for deflecting the third color light 53, it is optional to further configure the first sub-pre-polarizing grating 411, the second sub-pre-polarizing grating 412, and the third sub-pre-polarizing grating 413 to be arranged in the same layer along the direction perpendicular to the first side F1 to the second side S2. That is, the pre-polarizing grating 40 including three sub-pre-polarizing gratings 41 can be presented as a single-layer pre-polarizing grating 40 along the direction from the first side F1 to the second side S2 of the lens body 10. In other words, it is optional to configure the pre-polarizing grating 40 to be used for deflecting the first color light 51, to be used simultaneously for deflecting the second color light 52, and to be used simultaneously for deflecting the third color light 53. This configuration not only enables the pre-polarizing grating 40 to deflect the three colors of display lasers, but also ensures that the thickness of the mirror body 10 is as thin as possible, avoiding the complexity of the overall manufacturing process of the display device corresponding to the field lens 100, and also avoiding the situation where the thickness and weight of the display device are too large, thus improving the affordability of the corresponding display device.

[0114] Alternatively, when the first sub-pre-polarization grating 411, the second sub-pre-polarization grating 412, and the third sub-pre-polarization grating 413 are set on the same layer, they are formed by the spatial superposition of three sub-pre-polarization gratings 41 with different periods. Specifically, these three periods are the first period T1 for pre-polarizing the first color light 51, the second period T2 for pre-polarizing the second color light 52, and the third period T3 for pre-polarizing the third color light 53. It should be noted that the pre-polarization grating 40 formed by the superposition of these three periods is not a grating with a fixed period.

[0115] Please continue to refer to Figure 15 and 16 Optionally, the period of the first sub-pre-polarization grating 411 is T1, the period of the second sub-pre-polarization grating 412 is T2, and the period of the third sub-pre-polarization grating 413 is T3; T1≠T2≠T3.

[0116] Specifically, this application also provides an optional configuration where, when the pre-polarizing grating 40 includes a first sub-pre-polarizing grating 411, a second sub-pre-polarizing grating 412, and a third sub-pre-polarizing grating 413, the first sub-pre-polarizing grating 411 can be used to deflect the first color light 51, the second sub-pre-polarizing grating 412 can be used to deflect the second color light 52, and the third sub-pre-polarizing grating 413 can be used to deflect the third color light 53. Since the period of the sub-pre-polarizing grating 41 is set to the period of the light to be deflected... The period of the light source is related to the wavelength of the light source. For example, a red light with a wavelength of 700nm can be set to a period of 1029nm, a green light with a wavelength of 546nm can be set to a period of 478nm, and a blue light with a wavelength of 435nm can be set to a period of 836nm. Therefore, the periods T1 of the first sub-pre-polarization grating 411, T2 of the second sub-pre-polarization grating 412, and T3 of the third sub-pre-polarization grating 413 can all be set to be different.

[0117] That is, the periods of the sub-pre-polarization gratings 41 corresponding to different colored lights can be set to be different, but the period of the sub-pre-polarization gratings 41 corresponding to the same colored light is fixed. For example, when the first colored light 51 is red light, the second colored light 52 is green light, and the third colored light 53 is blue light, this application can choose to set the period T1 of the first sub-pre-polarization grating 411 to be greater than the period T3 of the third sub-pre-polarization grating 413, and set the period T3 of the third sub-pre-polarization grating 413 to be greater than the period T2 of the second sub-pre-polarization grating 412.

[0118] Please refer to Figure 3 Optionally, the first side F1 is the functional light input side, and the second side S2 is the functional light output side.

[0119] Specifically, this application also provides an optional configuration in which the first side F1 of the mirror body 10 is the functional light-incident side, such as the laser emission side in a corresponding display device, and the second side S2 of the mirror body 10 is the functional light-out side, such as the light-converging imaging side in a corresponding display device.

[0120] Figure 20 The image shown is provided in an embodiment of this application. Figure 2 For another cross-sectional view of BB', please refer to Figure 2 , Figure 3 and Figure 20 Based on the same inventive concept, this application also provides a field lens 100, including a lens body 10 and an optical structure 20;

[0121] The mirror body 10 includes at least two layers of gratings (30 / 40). Along the direction perpendicular to the plane where the mirror body 10 is located, the mirror body 10 includes a first side F1 and a second side S2. The optical structure 20 is located on the side of the at least one layer of gratings (30 / 40) closer to the second side S2.

[0122] The angle at which the mirror body 10 diffracts the first color ray 71 is θ1, and the angle at which the optical structure 20 allows the first color ray 71 to exit is α1, where α1 < θ1; the minimum angle at which the mirror body 10 diffracts the first color ray 71 is A1, where α1 < A1.

[0123] It should be noted that the angle θ1 at which the mirror body 10 diffracts the first color ray 71 refers to the angle at which diffraction occurs in the angle formed between the ray and the normal L when the ray exits to one side of the mirror body 10; the angle α1 at which the optical structure 20 allows the first color ray 71 to exit refers to the angle at which the first color ray 71 is allowed to exit in the angle formed between the ray and the normal L when the ray exits to one side of the mirror body 10; and the minimum angle A1 at which the mirror body 10 diffracts the first color ray 71 refers to the minimum angle at which diffraction occurs in the angle formed between the ray and the normal L when the ray exits to one side of the mirror body 10. Specifically, this application also provides a field lens 100, which includes a lens body 10 and an optical structure 20. The lens body 10 may include two or more gratings (30 / 40), and each grating (30 / 40) may further include a substrate, which may be made of glass, that is, the grating (30 / 40) may be made on a glass substrate; in addition, the substrate may also be made of other materials, and this application does not specifically limit this; along the direction perpendicular to the plane where the lens body 10 is located, the lens body 10 can be divided into a first side F1 and a second side S2. The first side F1 is the side that receives the display light, and the second side S2 is the side that emits the display light. The second side S2 is also subject to external light entering it; this application sets the optical structure 20 to be located on at least one grating (30 / 40) in the lens body 10 near its second side S2. For example, the optical structure 20 may also be set to be located on the second side S2 of the entire lens body 10.

[0124] When external light (first color light 71) shines from the second side S2 of the mirror body 10 to the first side F1, the substrate corresponding to the grating (30 / 40) in the mirror body 10 reflects the external light. Especially when the substrate is made of glass, the reflection of external light by the glass substrate is more obvious. This application can block part of the visible light (first color light 71) from entering the mirror body 10 by setting the optical structure 20, and / or can block at least part of the light reflected by the glass substrate included by the grating (30 / 40) to the second side S2 by the optical structure 20, thereby reducing the number of first color light 71 that is reflected by the grating (30 / 40) and then emitted to the second side S2 of the mirror body 10. This can reduce the number of diffraction fringes that can be observed by the user on the second side S2 of the mirror body 10, which is beneficial to weaken the impact of diffraction fringes on the display effect.

[0125] It should be noted that the optical structure 20 added to the field lens 100 can be set on the second side S2 of the entire mirror body 10, or on the second side S2 of any grating (30 / 40) in the mirror body 10, or the second side S2 of at least two different gratings (30 / 40) includes the optical structure 20. This application limits the number and setting position of the optical structure 20 included in the field lens 100. Users can adjust the setting position and number of optical structures 20 according to actual needs. As long as the optical structure 20 can reduce the amount of visible light (first color ray 71) incident into the mirror body 10 and / or reduce the amount of visible light emitted to the second side of the mirror body 10 after reflection by the substrate in the mirror body 10, the number of diffraction fringes can be reduced. Because as long as an optical structure 20 is provided on the second side S2 of any grating (30 / 40), the amount of visible light received by any grating (30 / 40) present on the first side F1 of the optical structure 20 can be reduced, and / or the amount of visible light reflected can be reduced. The amount of visible light emitted from the second side S2 of the mirror body 10 after being reflected is reduced, which can achieve the effect of reducing the diffraction fringes on the second side S2 of the field lens 100. This can reduce the impact of diffraction fringes on the display effect to a certain extent and improve the display effect of the relevant display device.

[0126] When the angle at which the first color light 71 irradiated from the second side S2 to the first side F1 of the mirror body 10 can diffract is θ1, the optical structure 20 can be set to allow the first color light 71 to exit at an angle of α1, where α1 < θ1. This allows the first color light 71, after being reflected by the grating (30 / 40) in the mirror body 10, to be blocked by the optical structure 20. When the first color light 71 irradiates the mirror body 10 from the second side S2, it cannot be reflected by the grating (30 / 40) in the mirror body 10 and exit to the second side S2 of the mirror body 10. In other words, no diffracted light will appear on the second side S2 of the mirror body 10, thus eliminating the influence of diffraction stripes on the display effect and improving the display effect of the relevant display device.

[0127] When the minimum angle at which the mirror body 10 diffracts the first color light 71 is A1, as long as the optical structure 20 allows the angle at which the first color light 71 exits to be less than A1, the first color light 71 that is reflected by the grating (30 / 40) in the mirror body 10 and emitted toward the second side S2 of the mirror body 10 can be blocked by the optical structure 20. When the first color light 71 shines onto the mirror body 10 from the second side S2, it cannot be reflected by the grating (30 / 40) in the mirror body 10 and then emitted toward the second side S2 of the mirror body 10. In other words, no diffracted light will appear on the second side S2 of the mirror body 10, thus eliminating the influence of diffraction stripes on the display effect and improving the display effect of the relevant display device.

[0128] Figure 21 The image shown is provided in an embodiment of this application. Figure 2 Another cross-sectional view of BB'. Figure 22 The image shown is provided in an embodiment of this application. Figure 2 For another cross-sectional view of BB', please refer to Figure 2 , Figure 3 and Figure 21 , Figure 22 Optionally, the angle at which the mirror 10 diffracts the second-color ray 72 is θ2, and the angle at which the optical structure 20 allows the second-color ray 72 to exit is α2, where α2 < θ2; the minimum angle at which the mirror 10 diffracts the second-color ray 72 is A2, where α2 < A2; and / or,

[0129] The angle at which the mirror body 10 diffracts the third color ray 73 is θ3, and the angle at which the optical structure 20 allows the third color ray 73 to exit is α3, where α3 < θ3; the minimum angle at which the mirror body 10 diffracts the third color ray 73 is A3, where α3 < A3.

[0130] It should be noted that the angle θ2 at which the mirror body 10 diffracts the second color ray 72 refers to the angle at which diffraction occurs in the angle formed between the ray and the normal L when the ray exits to one side of the mirror body 10; the angle α2 at which the optical structure 20 allows the second color ray 72 to exit refers to the angle at which the second color ray 72 is allowed to exit in the angle formed between the ray and the normal L when the ray exits to one side of the mirror body 10; and the minimum angle A1 at which the mirror body 10 diffracts the second color ray 72 refers to the minimum angle at which diffraction occurs in the angle formed between the ray and the normal L when the ray exits to one side of the mirror body 10. Specifically, this application also provides an optional setting where, when the angle at which the second-color light 72 irradiated from the second side S2 to the first side F1 of the mirror body 10 can diffract is θ2, the optical structure 20 can be optionally set to allow the second-color light 72 to exit at an angle of α2, where α2 < θ2. This allows the second-color light 72, after being reflected by the grating (30 / 40) in the mirror body 10, to be blocked by the optical structure 20. When the second-color light 72 irradiates the mirror body 10 from the second side S2, it cannot be reflected by the grating (30 / 40) in the mirror body 10 and then exit to the second side S2 of the mirror body 10. In other words, no diffracted light will appear on the second side S2 of the mirror body 10, thus eliminating the influence of diffraction stripes on the display effect and improving the display effect of the relevant display device.

[0131] When the minimum angle at which the mirror body 10 diffracts the second color light 72 is A2, as long as the optical structure 20 allows the angle at which the second color light 72 exits to be less than A2, the second color light 72 that is reflected by the grating (30 / 40) in the mirror body 10 and emitted toward the second side S2 of the mirror body 10 can be blocked by the optical structure 20. When the second color light 72 shines onto the mirror body 10 from the second side S2, it cannot be reflected by the grating (30 / 40) in the mirror body 10 and then emitted toward the second side S2 of the mirror body 10. That is, no diffracted light will appear on the second side S2 of the mirror body 10, thus eliminating the influence of diffraction stripes on the display effect and improving the display effect of the relevant display device.

[0132] It should be noted that the angle θ3 at which the mirror body 10 diffracts the third color ray 73 refers to the angle at which diffraction occurs in the angle between the ray and the normal L when the ray exits to one side of the mirror body 10; the angle α3 at which the optical structure 20 allows the third color ray 73 to exit refers to the angle at which the third color ray 73 is allowed to exit in the angle between the ray and the normal L when the ray exits to one side of the mirror body 10; and the minimum angle A3 at which the mirror body 10 diffracts the third color ray 73 refers to the minimum angle at which diffraction occurs in the angle between the ray and the normal L when the ray exits to one side of the mirror body 10. Alternatively, when the angle at which the third-color light 73 irradiated from the second side S2 to the first side F1 of the mirror body 10 can diffract is θ3, the optical structure 20 can be set to allow the third-color light 73 to exit at an angle of α3, where α3 < θ3. This allows the third-color light 73, after being reflected by the grating (30 / 40) in the mirror body 10, to be blocked by the optical structure 20. When the third-color light 73 irradiates the mirror body 10 from the second side S2, it cannot be reflected by the grating (30 / 40) in the mirror body 10 and then exit to the second side S2 of the mirror body 10. In other words, no diffracted light will appear on the second side S2 of the mirror body 10, thus eliminating the influence of diffraction stripes on the display effect and improving the display effect of the relevant display device.

[0133] When the minimum angle at which the mirror body 10 diffracts the third color light 73 is A3, as long as the optical structure 20 allows the angle at which the third color light 73 exits to be less than A3, the third color light 73 that is reflected by the grating (30 / 40) in the mirror body 10 and emitted toward the second side S2 of the mirror body 10 can be blocked by the optical structure 20. When the third color light 73 shines onto the mirror body 10 from the second side S2 of the mirror body 10, it cannot be reflected by the grating (30 / 40) in the mirror body 10 and then emitted toward the second side S2 of the mirror body 10. That is, no diffracted light will appear on the second side S2 of the mirror body 10, thus eliminating the influence of diffraction stripes on the display effect and improving the display effect of the relevant display device.

[0134] Please refer to Figure 3 , Figures 20-22 Optionally, the first color ray 71 is red, the second color ray 72 is green, and the third color ray 73 is blue; wherein A2 > A1, and / or A2 > A3.

[0135] Specifically, in the above embodiments, the first color light 71 can be red light, the second color light 72 can be green light, and the third color light 73 can be blue light. In this case, the minimum diffraction angle A2 of the mirror body 10 for green light can be set to be greater than the minimum diffraction angle A1 of the mirror body 10 for red light, and / or, the minimum diffraction angle A2 of the mirror body 10 for green light can be set to be greater than the minimum diffraction angle A3 of the mirror body 10 for blue light.

[0136] Please refer to Figures 3-5 Optionally, the angle range for visible light diffraction by the mirror body 10 is θ, and the angle for visible light emission by the optical structure 20 is α, where α < θ.

[0137] It should be noted that the angle θ at which visible light is diffracted by the mirror body 10 refers to the angle at which diffraction occurs when the light ray exits to one side of the mirror body 10 and the normal L; the angle α at which visible light is allowed to exit by the optical structure 20 refers to the angle at which visible light is allowed to exit by the angle between the light ray and the normal L when the light ray exits to one side of the mirror body 10. Specifically, this application also provides an optional setting where, when the angle at which visible light irradiated from the second side S2 to the first side F1 of the mirror body 10 can diffract is θ, the optical structure 20 can be optionally set to allow visible light to exit at an angle α, where α < θ. This allows the light rays reflected by the grating (30 / 40) in the mirror body 10 and emitted towards the second side S2 of the mirror body 10 to be blocked by the optical structure 20. When visible light irradiates the mirror body 10 from the second side S2, the visible light cannot be reflected by the grating (30 / 40) in the mirror body 10 and then emitted towards the second side S2 of the mirror body 10. In other words, no diffracted light will appear on the second side S2 of the mirror body 10, thus eliminating the influence of diffraction stripes on the display effect and improving the display effect of the relevant display device.

[0138] Please refer to Figures 3-5 Optionally, the minimum angle at which the mirror 10 diffracts visible light is A, where α < A.

[0139] It should be noted that the minimum angle A for visible light diffraction by the mirror 10 refers to the minimum angle at which diffraction occurs between the light ray and the normal L when the light ray exits to one side of the mirror 10. Specifically, this application also provides an optional setting where, when the minimum angle for visible light diffraction by the mirror 10 is A, as long as the optical structure 20 allows the angle of visible light exit to be less than A, the light rays emitted to the second side S2 of the mirror 10 after reflection by the grating (30 / 40) in the mirror 10 can be blocked by the optical structure 20. When visible light shines on the mirror 10 from the second side S2, the visible light cannot be reflected by the grating (30 / 40) in the mirror 10 and then exit to the second side S2 of the mirror 10. That is, no diffracted light rays will appear on the second side S2 of the mirror 10, thus eliminating the influence of diffraction fringes on the display effect and improving the display effect of the relevant display device.

[0140] It should be noted that the minimum angle A for visible light diffraction of the first grating 40 refers to the minimum angle at which diffraction occurs when the light rays exit towards the mirror body 10 and the normal L corresponding to the substrate of the first grating 40; the minimum angle K for visible light diffraction of the second grating 30 refers to the minimum angle at which diffraction occurs when the light rays exit towards the mirror body 10 and the normal L corresponding to the substrate of the second grating 30. An alternative embodiment is provided here, for example, when the mirror body 10 includes a first grating 30 and a second grating 40 arranged sequentially along the direction from the first side F1 to the second side S2, if the minimum diffraction angle of the first grating 30 with visible light is A and the minimum diffraction angle of the second grating 40 with visible light is K, and A is less than K, if the optical structure 20 is disposed between the first grating 30 and the second grating 40, the optical structure 20 can be configured to only block the light reflected by the first grating 30 from escaping to the second side S2 of the mirror body 10. In this case, it can be achieved simply by setting the angle α that allows visible light to escape from the optical structure 20 to be less than A. If the optical structure 20 is disposed on the side of the second grating 40 away from the first grating 30, and the angle α that allows visible light to escape from the optical structure 20 to be less than K, it can only block the light reflected by the second grating 40. The light rays are emitted towards the second side S2 of the mirror body 10. However, for the first grating 40, it can only block part of the light rays reflected by the first grating 40 from emitting towards the second side S2 of the mirror body 10. If it is desired to block the light rays reflected by the first grating 30 and the second grating 40 from emitting towards the second side S2 of the mirror body 10 at the same time, the angle α that the optical structure 20 allows visible light to emit can be set to be less than A. Since A is less than K, setting α < K can only block part of the light rays reflected from the first grating 30 from emitting towards the second side S2 of the mirror body 10. If α < A is set, all the light rays reflected from the first grating 30 can be blocked from emitting towards the second side S2 of the mirror body 10. That is, as long as the optical structure 20 can block the emission of diffracted light rays at the minimum angle of diffraction for visible light, it can also block other light rays reflected by the grating (30 / 40) that want to emit from the second side S2 of the mirror body 10.

[0141] Please refer to Figures 3-5 Optionally, the optical structure 20 includes a light-limiting layer 21, which includes a plurality of light-shielding portions 211 and light-transmitting portions 212 arranged alternately along a first direction Z1; the first direction Z1 is a direction perpendicular to the first side F1 and pointing to the second side S2.

[0142] Specifically, this application provides an optional configuration in which the optical structure 20 provided in this application may include a light limiting layer 21, in which a plurality of light-shielding parts 211 and light-transmitting parts 212 may be provided, and the light-shielding parts 211 and light-transmitting parts 212 may be alternately arranged in a direction perpendicular to the first side F1 and pointing to the second side S2. The light-shielding part 211 can be used to block part of the incident light that enters from the second side S2 of the mirror body 10 to the first side F1, and / or the light-shielding part 211 can be used to block the reflected light that enters from the second side S2 of the mirror body 10 to the first side F1 after being reflected by the grating (30 / 40) in the mirror body 10 and then exits to the second side S2, thereby reducing the number of diffraction fringes appearing on the second side S2 of the mirror body 10 and improving the display effect of the related display device; the light-transmitting part 212 can be used to allow the light from the first side F1 of the mirror body 10 to pass through, so as to ensure the normal display function of the related display device and avoid the influence of the light-limiting layer 21 on the normal display effect of the related display device.

[0143] Please refer to Figures 3-5 Optionally, the spacing d between at least some of the light-shielding parts 211 that are arranged adjacently is the same, and the height h of at least some of the light-shielding parts 211 is the same along the direction from the first side F1 to the second side S2.

[0144] Specifically, this application also provides an optional configuration method in which the optical structure 20 includes a light limiting layer 21. When the light limiting layer 21 includes light-shielding portions 211 and light-transmitting portions 212 alternately arranged along the first direction Z1, the spacing d between at least some of the adjacent light-shielding portions 211 can be set to be the same. Alternatively, the height h of at least some of the light-shielding portions 211 can be set to be the same along the direction from the first side F1 to the second side S2. Furthermore, it can be further configured that the height h of all the light-shielding portions 211 included in the light limiting layer 21 is the same, and the spacing d between any two adjacent light-shielding portions 211 is the same.

[0145] Please continue to refer to Figures 3-5 Optionally, the distance between two adjacent light-shielding parts 211 is d, the direction is from the first side F1 to the second side S2, the height of the light-shielding part 211 is h, and the angle at which the optical structure 20 allows visible light to be emitted is α, where α = (1 / 2)*arctan(h / d).

[0146] Specifically, since the height h and spacing d of the light-shielding parts 211 control the angle β of light emitted from its first side F1 to its second side S2, when the height h is equal, a smaller spacing d results in a relatively smaller angle β, and a larger spacing d results in a relatively larger angle β; conversely, when the spacing d is equal, a smaller height h results in a relatively larger angle β, and a larger height h results in a relatively smaller angle β. Therefore, by setting all the light-shielding parts 211 in the light-limiting layer 21 to have the same height h and spacing d, uniform control of the angle β of light emitted from the first side F1 to its second side S2 of the light-limiting layer 21 can be achieved. The angle α that the optical structure 20 allows visible light to exit refers to the angle formed between the light ray and the normal L when the light ray exits towards the mirror body 10. Therefore, the value of α is half of the angle β.

[0147] In summary, the size of α can be adjusted by adjusting d and h. Therefore, this application also provides an optional setting method where any d and any h in the light limiting layer 21 are equal, that is, the distance between any two adjacent light-shielding parts 211 is d. Along the direction from the first side F1 to the second side S2, the height of any light-shielding part 211 is h. Specifically, the calculation method for the angle at which visible light can be emitted by the optical structure 20 is α = (1 / 2) * arctan(h / d). The angle α at which visible light can be emitted by the optical structure 20 is equivalent to half of the aforementioned viewing angle β. As can be seen from the above formula, when h remains constant, a smaller distance d results in a smaller viewing angle β (the angle α at which visible light can be emitted), and a larger distance d results in a larger viewing angle β. When d remains constant, a smaller height h results in a larger viewing angle β, and a larger height h results in a smaller viewing angle β. In one of the alternative embodiments provided in this application, the value of the spacing d can be between 100μm and 1mm. If the spacing d is greater than 1mm, the amount of light that can be blocked by the light shield will be greatly reduced, making it difficult to achieve the desired effect of reducing diffraction fringes. If the spacing d is less than 100μm, the display light may not be able to pass through the optical structure 20 normally and be emitted to the user side, and the user will not be able to see the required display image, affecting the display effect of the corresponding display device.

[0148] It should be added that the light-limiting layer 21 can specifically be presented as a venetian blind structure, where the spacing d is the distance between the slats in the venetian blind, and the height h is the thickness of the venetian blind. Please refer to... Figure 6This application also provides an alternative configuration in which, in addition to the light limiting layer 21, the optical structure 20 may further include a polyethylene terephthalate (PET) layer 213 disposed on the light limiting layer 21 facing the first side F1. The PET layer 213 may be bonded and fixed to the light limiting layer 21 by adhesive 214. It may also further include a polycarbonate (PC) layer 215 disposed on the second side S2 of the light limiting layer 21, and an anti-glare hard coating 216 disposed on the side of the PC layer 215 away from the light limiting layer 21, so as to make the display effect of the corresponding display device better.

[0149] Figure 23 The diagram shown is a schematic representation of a display device provided in an embodiment of this application. Please refer to the provided text for further details. Figures 3-22 Reference Figure 23 Based on the same inventive concept, this application also provides a display device 200, which includes a field lens 100, which can be any type of field lens 100 provided in this application.

[0150] Optionally, the display device 200 further includes a spatial light modulator 92 and a backlight 91, wherein the spatial light modulator 92 is located between the field lens 100 and the backlight 91.

[0151] Specifically, the display device 200 provided in this application, in addition to the field lens 100, may also include a spatial light modulator 92 and a backlight 91. The spatial light modulator 92 may be disposed between the field lens 100 and the backlight 91. The backlight 91 is a point light source or a laser. The backlight 91 may include a light-emitting part 911 (point light source / laser) and a beam expander and collimator assembly 912. The light-emitting part 911 is used to emit display light or display laser. The spatial light modulator 92 includes two LCDs (Liquid Crystal Displays) for phase modulation and amplitude modulation. The display (liquid crystal display) panels are bonded together with pixel-level precision, so that incident light passes through the corresponding pixels of the two panels in sequence, and the amplitude and phase are adjusted respectively to complete the holographic display. That is, after the display light is emitted by the light-emitting part 911, it passes through the beam expander collimator 912 and the spatial light modulator 92, and enters the field lens 100 from the first side F1 and exits from the second side S2. After passing through the spatial light modulator 92, the display light exiting the field lens 100 can achieve the adjustment of the light deflection angle, so that light of different directions is incident on the user's observation side, and the light is concentrated and continuously irradiated on the user's observation side.

[0152] It should be noted that the above content indicates that the light-emitting part 911 is used to emit display light or display laser. Both display light and display laser are electromagnetic waves. The difference between the two lies in their wavelengths. The wavelength of laser is shorter than that of light (visible light).

[0153] As can be seen from the above embodiments, the field lens and display device provided by the present invention achieve at least the following beneficial effects:

[0154] This application provides a field lens and a display device. The field lens includes a lens body and an optical structure. The optical structure is located on the side of at least one grating in the field lens, close to the second side of the lens body. The optical structure blocks at least a portion of the visible light incident on one side of the lens body and / or blocks at least a portion of the visible light emitted to the second side of the lens body after reflection by the grating. This reduces the amount of reflected light emitted to the second side of the lens body after reflection, thereby reducing the generation of diffraction fringes and weakening the impact of diffraction fringes on the display effect of the display device.

[0155] While specific embodiments of the invention have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of the invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A field lens characterized in that, The mirror body comprises at least two gratings, and the mirror body comprises a first side and a second side in a direction perpendicular to a plane in which the mirror body is located, and the optical structure is located on a side of at least one of the gratings close to the second side. The optical structure is used for blocking at least part of visible light from being incident on one side of the mirror body and / or for blocking at least part of visible light reflected by the gratings from being emitted toward the second side of the mirror body. The optical structure comprises a light-defining layer, and the light-defining layer comprises a plurality of light-blocking parts and light-transmitting parts arranged alternately in a first direction. An angle at which the mirror body diffracts the visible light is θ, and an angle at which the optical structure allows the visible light to be emitted is α, and α < θ. A minimum angle at which the mirror body diffracts the visible light is A, and α < A.

2. The field lens of claim 1, wherein, A distance between at least part of two adjacent light-blocking parts is d, and a height of at least part of the light-blocking parts in a direction from the first side to the second side is h.

3. The field lens of claim 1, wherein, The distance between the two adjacent light-blocking parts is d, the height of the light-blocking part in the direction from the first side to the second side is h, the optical structure allows the visible light to be emitted at an angle α, and α = (1 / 2) * arctan (h / d).

4. The field lens of claim 1, wherein, The light-blocking part is made of light-absorbing material.

5. The field lens of claim 1, wherein, A plane in which at least one of the light-blocking parts is located is perpendicular to a plane in which at least one of the gratings is located.

6. The field lens of claim 1, wherein, 7. The field lens of claim 1, wherein, The mirror body comprises a pre-deflection grating and a converging grating arranged in a stack in a direction from the first side to the second side. The optical structure is located on a side of the converging grating away from the pre-deflection grating.

8. The field lens of claim 7, wherein, The optical structure is located between the converging grating and the pre-deflection grating.

9. The field lens of claim 7, wherein, 10. The field lens of claim 7, wherein, The converging grating comprises a plurality of sub-converging gratings arranged in a stack in a direction from the first side to the second side, and the plurality of sub-converging gratings comprise a first sub-converging grating, a second sub-converging grating, and a third sub-converging grating. The pre-deflection grating comprises a plurality of sub-pre-deflection gratings arranged in a stack in a direction from the first side to the second side, and the plurality of sub-pre-deflection gratings comprise a first sub-pre-deflection grating, a second sub-pre-deflection grating, and a third sub-pre-deflection grating. The optical structure is located between two adjacent sub-pre-deflection gratings.

11. The field lens of claim 10, wherein, 12. The field lens of claim 10, wherein, Light passing through the mirror body and the optical structure comprises first color light, second color light, and third color light in a direction from the first side to the second side of the mirror body. The first sub-converging grating and the first sub-pre-deflection grating are used for deflecting the first color light, the second sub-converging grating and the second sub-pre-deflection grating are used for deflecting the second color light, and the third sub-converging grating and the third sub-pre-deflection grating are used for deflecting the third color light.

13. The field lens of claim 10, wherein, ​ The first sub-converging grating is located away from the first side of the first sub-predeflection grating, the second sub-converging grating is located away from the first side of the second sub-predeflection grating, and the third sub-converging grating is located away from the first side of the third sub-predeflection grating.

14. The field lens of claim 7, wherein, In a direction from the first side to the second side, the converging grating comprises a plurality of sub-converging gratings arranged in a stack, and the plurality of sub-converging gratings comprises a first sub-converging grating, a second sub-converging grating, and a third sub-converging grating. In a direction from the first side to the second side of the mirror body, light rays passing through the mirror body and the optical structure comprise first color light rays, second color light rays, and third color light rays. The first sub-converging grating and the predeflection grating are configured to deflect the first color light rays, the second sub-converging grating and the predeflection grating are configured to deflect the second color light rays, and the third sub-converging grating and the predeflection grating are configured to deflect the third color light rays.

15. Field lens according to claim 10 or 14, characterized in that The optical structure is located between two adjacent sub-converging gratings.

16. The field lens of claim 10 or 14, wherein, The period of the sub-converging grating gradually increases from an edge to a middle in a direction perpendicular to a thickness of the sub-converging grating. The plurality of predeflection gratings comprises a first sub-predeflection grating configured to deflect the first color light rays, a second sub-predeflection grating configured to deflect the second color light rays, and a third sub-predeflection grating configured to deflect the third color light rays.

17. The field lens of claim 14, wherein, In a direction perpendicular to the direction from the first side to the second side, the first sub-predeflection grating, the second sub-predeflection grating, and the third sub-predeflection grating are arranged in a same layer.

18. The field lens of claim 10 or 17, wherein, The period of the first sub-predeflection grating is T1, the period of the second sub-predeflection grating is T2, and the period of the third sub-predeflection grating is T3; T1≠T2≠T3. The first side is a functional light-in side, and the second side is a functional light-out side.

19. The field lens of claim 1, wherein, The mirror body and the optical structure are included.

20. A field lens characterized in that, The mirror body comprises at least two gratings, and in a direction perpendicular to a plane in which the mirror body is located, the mirror body comprises a first side and a second side, and the optical structure is located on a side of at least one of the gratings close to the second side. The optical structure comprises a light-defining layer, and the light-defining layer comprises a plurality of light-blocking portions and light-transmitting portions alternately arranged in a first direction; the first direction is a direction perpendicular to the direction from the first side to the second side. An angle at which the mirror body diffracts first color light rays is θ1, an angle at which the optical structure allows the first color light rays to exit is α1, and α1<θ1; a minimum angle at which the mirror body diffracts the first color light rays is A1, and α1<A1. An angle at which the mirror body diffracts second color light rays is θ2, an angle at which the optical structure allows the second color light rays to exit is α2, and α2<θ2; a minimum angle at which the mirror body diffracts the second color light rays is A2, and α2<A2; and / or, ​ The mirror body diffracts the third color light at an angle θ3, and the optical structure allows the third color light to exit at an angle α3, where α3< θ3; the mirror body diffracts the third color light at a minimum angle A3, where α3< A3.

21. The field lens of claim 20, wherein, The first color light is red light, the second color light is green light, and the third color light is blue light; wherein A2> A1, and / or A2> A3.

22. The field lens of claim 20, wherein, The mirror body diffracts visible light at an angle range θ, and the optical structure allows the visible light to exit at an angle α, where α< θ.

23. The field lens of claim 22, wherein, The mirror body diffracts the visible light at a minimum angle A, where α< A.

24. The field lens of claim 20, wherein, The spacing between at least some of the adjacent light blocking portions is the same, and the height of at least some of the light blocking portions is the same in a direction from the first side to the second side.

25. The field lens of claim 20, wherein, The spacing between two adjacent light blocking portions is d, the height of the light blocking portions in a direction from the first side to the second side is h, and the optical structure allows the visible light to exit at an angle α, where α = (1 / 2)*arctan(h / d).

26. A display device comprising: A display device comprising the field lens of any one of claims 1-25.

27. The display device of claim 26, wherein, Further comprising a spatial light modulator and a backlight, the spatial light modulator being located between the field lens and the backlight.

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