Waveguide member, display device, and augmented reality display apparatus

Abstract

The invention discloses a waveguide component, a display device and augmented reality display equipment, and relates to the technical field of augmented reality, the waveguide component is provided with a coupling-in area and a coupling-out area, the coupling-in area is used for coupling in imaging light emitted by a light emitting component, so that the imaging light is propagated in the waveguide component through total reflection, and the coupling-out area is used for coupling out imaging light emitted by the light emitting component. The coupling-out area is used for coupling out the imaging light in the waveguide component; wherein the surface of the waveguide component is provided with a light filtering film, the light filtering film is located on a light incidence path of the coupling-in area, the light filtering film is provided with a light blocking area and a light passing area, the light blocking area is used for blocking stray light from being transmitted towards the waveguide component, and the light passing area is used for enabling imaging light to be transmitted to the coupling-in area. According to the technical scheme, the waveguide component with the light filtering function is provided, the occupied volume of the display device can be reduced, and the display effect of the display device is guaranteed.

Description

Technical Field

[0001] The present invention relates to the field of augmented reality technology, and in particular to a waveguide component, a display device and an augmented reality display equipment. Background Art

[0002] In the related art, the display device of the enhanced display product usually includes a light emitting component and a waveguide component, and the waveguide component is used to receive and transmit the light emitted by the light emitting component. In order to prevent stray light from entering the waveguide component and being transmitted to the human eye, thereby affecting the display effect of the display device, the display device usually needs to set an aperture inside the light emitting component or between the light emitting component and the waveguide component to filter and isolate the stray light through the aperture. However, this setting method will significantly increase the volume and weight of the display device. Summary of the invention

[0003] The main purpose of the present invention is to propose a waveguide component, a display device and an augmented reality display device, aiming to provide a waveguide component with a filtering function to reduce the occupied volume of the display device and ensure the display effect of the display device.

[0004] To achieve the above-mentioned purpose, the waveguide component proposed in the present invention has a coupling-in region and a coupling-out region, wherein the coupling-in region is used to couple the imaging light emitted by the light-emitting component so that the imaging light propagates inside the waveguide component by total reflection, and the coupling-out region is used to couple the imaging light inside the waveguide component outward;

[0005] Wherein, a filter film is provided on the surface of the waveguide component, and the filter film is located on the light incident path of the coupling area. The filter film has a light blocking area and a light passing area. The light blocking area is used to block stray light from being transmitted toward the waveguide component, and the light passing area is used to allow the imaging light to be transmitted to the coupling area.

[0006] In one embodiment, the filter film is light-proof, a light-through hole is formed in the filter film, the light-through hole is the light-transmitting area, and the parts of the filter film other than the light-through hole are the light-blocking area.

[0007] In one embodiment, the filter film includes at least one reflective layer, and the material of the reflective layer includes one of silver, chromium, and aluminum, which is used to reflect the stray light;

[0008] And / or, the filter film includes at least one light absorbing layer, the material of the light absorbing layer includes one of silicon oxide and titanium oxide, and is used to absorb the stray light;

[0009] And / or, a micro-nano structure is provided on a side of the filter film facing the light emitting component to absorb the stray light.

[0010] In one embodiment, the thickness of the filter film is D, which satisfies: 100nm≤D≤300nm.

[0011] In one embodiment, the waveguide component comprises a waveguide substrate, an incoupling grating and an outcoupling grating, the waveguide substrate is arranged on the light-emitting side of the light-emitting component, the incoupling grating and the outcoupling grating are arranged on the surface of the waveguide substrate respectively to form the incoupling region and the outcoupling region, and the filter film is arranged on the surface of the waveguide substrate facing the light-emitting component;

[0012] The coupling-in grating is arranged on the surface of the waveguide substrate facing the light-emitting component and is located in the light-transmitting area; or, the coupling-in grating is arranged on the surface of the waveguide substrate facing away from the light-emitting component, and the light-transmitting area is located on the coupling-in path of the coupling-in grating.

[0013] In one embodiment, a reflection grating is provided on a side of the filter film facing the waveguide substrate, and the reflection grating is used to receive imaging light coupled into the waveguide substrate and not transmitted to the outcoupling grating, so that the imaging light can be reflected back to the outcoupling grating.

[0014] In one embodiment, the grating period of the coupling grating is set to T1, and the grating period of the reflection grating is set to T2, wherein T1 and T2 satisfy: T1=2T2;

[0015] And / or, at least a portion of the reflective grating is embedded on a side of the filter film facing the waveguide substrate.

[0016] In one embodiment, the waveguide component includes a waveguide base and a waveguide cover plate, the waveguide cover plate is connected to a side of the waveguide base facing the light output component, and the waveguide cover plate can be arranged to be light-transmissive;

[0017] The filter film is disposed on at least one surface of the waveguide cover plate.

[0018] The present invention further provides a display device, comprising a light emitting component and any one of the aforementioned waveguide components, wherein the light emitting component is used to emit imaging light to a light passing area of ​​the waveguide component within a preset field of view angle range.

[0019] In one embodiment, the optical axis direction of the light emitting component is inclined relative to the normal direction of the waveguide substrate surface, the light-transmitting area is approximately elliptical, and the projection of the exit pupil position of the light emitting component on the plane where the light-transmitting area is located is offset in the long axis direction of the light-transmitting area relative to the center position of the light-transmitting area.

[0020] In one embodiment, the distance from the exit pupil position of the light emitting component to the waveguide component is h1, the exit pupil radius of the light emitting component is r1, the field of view angle of the light emitting component is θ1, the incident inclination angle of the light emitting component is θ2, and the offset of the intersection of the optical axis of the light emitting component and the light-transmitting area relative to the center of the light-transmitting area is M, then it satisfies: M = |h1|tan(θ2 / 2).

[0021] In one embodiment, the major axis of the light-transmitting area is r x , the short axis of the light-passing area is r y , then it satisfies:

[0022] r x =r1+|h1|tan(θ1 / 2);

[0023] r y =r1cosθ2+0.5[(|h1|+r1sinθ2)tan(θ1 / 2+θ2)+(|h1|-r1sinθ2)tan(θ1 / 2-θ2)].

[0024] The present invention also provides an augmented reality display device, comprising any one of the aforementioned display devices.

[0025] The waveguide component of the technical solution of the present invention has a coupling-in area and a coupling-out area for receiving the imaging light emitted by the light-emitting component. Among them, a filter film is provided on the side of the waveguide component facing the light-emitting component, and the light-through area of ​​the filter film is located in the light path from the light-emitting component to the coupling-in area, and the light-through area can be set to be transparent, so that the imaging light emitted by the light-emitting component can be transmitted to the coupling-in area via the light-through area, and the light-blocking area of ​​the filter film can block the stray light from being transmitted toward the waveguide component. In this way, the stray light can be blocked from entering the waveguide component by the filter film without affecting the transmission of the imaging light emitted by the light-emitting component toward the human eye, thereby ensuring the display effect of the display device. Since the technical solution of the present invention adopts the filter film on the waveguide component to filter and isolate stray light, the waveguide component itself has a filtering function. Compared with the aperture, the film layer structure of the filter film makes it occupy a smaller volume and lighter weight, which is conducive to reducing the volume and weight of the display device. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0027] Figure 1A schematic structural diagram of a first embodiment of a display device provided by the present invention;

[0028] Figure 2 for Figure 1 A partial structural diagram of the display device;

[0029] Figure 3 A partial structural diagram of a second embodiment of a display device provided by the present invention;

[0030] Figure 4 A partial structural diagram of a third embodiment of a display device provided by the present invention;

[0031] Figure 5 This is a partial structural diagram of a fourth embodiment of a display device provided by the present invention.

[0032] Description of Figure Numbers:

[0033] 100, display device; 10, light emitting component; 20, waveguide component; 20a, coupling region; 21, waveguide substrate; 22, coupling grating; 23, waveguide cover; 30, filter film; 30a, light blocking region; 30b, light passing region; 31, filter layer; 311, light passing hole; 312, reflection surface; 32, reflection grating.

[0034] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0036] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0037] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, solution B, or solutions that satisfy both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0038] In the related art, the display device of the enhanced display product usually includes a light emitting component and a waveguide component, and the waveguide component is used to receive and transmit the light emitted by the light emitting component. Among them, in order to prevent stray light from entering the waveguide component and being transmitted to the human eye, thereby affecting the display effect of the display device, the display device usually needs to set an aperture inside the light emitting component or between the light emitting component and the waveguide component to filter and isolate the stray light through the aperture. However, since the aperture is usually a screen structure with a certain volume and weight, installing the aperture inside the display device will significantly increase the volume and weight of the display device.

[0039] To this end, the present invention proposes a waveguide component. By adding a filter film on the surface of the waveguide component, the filter film can be used to filter and isolate stray light. Compared with the aperture, the film layer structure of the filter film makes it occupy a smaller volume and lighter weight, which is beneficial to reducing the volume and weight of the display device.

[0040] The waveguide component 20 of the present application is introduced below with reference to a specific embodiment.

[0041] See also Figures 1 to 5 In one embodiment of the present invention, the waveguide component 20 has a coupling-in area 20a and a coupling-out area, the coupling-in area 20a is used to receive the imaging light emitted by the light-emitting component 10, so that the imaging light propagates through total reflection inside the waveguide component 20, and the coupling-out area is used to couple the imaging light inside the waveguide component 20 outward; wherein, the waveguide component 20 is provided with a filter film 30 on the side facing the light-emitting component 10, and the filter film 30 has a light-blocking area 30a and a light-transmitting area 30b, the light-blocking area 30a is used to block stray light from being transmitted toward the waveguide component 20, and the light-transmitting area 30b is located in the optical path from the light-emitting component 10 to the coupling-in area 20a, so that the imaging light emitted by the light-emitting component 10 can be transmitted into the filter film 30 and transmitted to the coupling-in area 20a.

[0042] In this embodiment, the waveguide component 20 may include a diffractive optical waveguide, which may be used as a light transmission structure of the display device. The diffractive optical waveguide has an incoupling region 20a and an outcoupling region, and the incoupling region 20a is used to be arranged on the light output path of the light output component 10, and is used to receive the imaging light with image information emitted by the light output component.

[0043] The light-emitting component 10 is used to provide incident light for the waveguide component 20, and can be specifically set as a DLP optical machine, an LCOS optical machine, etc. The emitted imaging light can be incident from the air medium to the coupling-in region 20a of the waveguide component 20, so that the imaging light is coupled into the diffraction light waveguide through the coupling-in region 20a, and is transmitted toward the coupling-out region of the waveguide component 20 by total reflection inside the diffraction light waveguide, and then coupled out to the human eye through the coupling-out region, so that the human eye can receive the display image of the light-emitting component 10.

[0044] Specifically in this embodiment, the diffraction optical waveguide includes a waveguide substrate 21, an in-coupling grating 22 and an out-coupling grating. The waveguide substrate 21 is also called a dielectric optical waveguide, which can be planar and have two side surfaces arranged opposite to each other. Of course, it can also be set to a cylindrical shape or other shapes. The in-coupling grating 22 and the out-coupling grating can be set on any surface of the waveguide substrate 21 to form the in-coupling area 20a or the out-coupling area of ​​the waveguide component 20. The in-coupling grating 22 can change the incident angle of the imaging light entering the inside of the waveguide substrate 21, so that the incident angle is greater than or equal to the critical angle, so that the imaging light can be totally reflected in the waveguide substrate 21, and the out-coupling grating can couple the imaging light in the waveguide substrate 21 outward. Among them, the in-coupling grating 22 and the out-coupling grating can be attached to the waveguide substrate 21 as separate optical elements, or the in-coupling grating 22 or the out-coupling grating can be machined and formed on the waveguide substrate 21. The coupling-in grating 22 and the coupling-out grating can be set to any type of grating such as straight grating, tilted grating, blazed grating, step grating, etc., which is not limited here.

[0045] In some embodiments, the waveguide component 20 may further include a waveguide cover plate 23 covering one side of the diffraction light waveguide, so as to improve the protection performance of the waveguide component 20 through the waveguide cover plate 23. The waveguide cover plate 23 is generally a light-transmitting structure, and its material may be, but is not limited to, a light-transmitting material such as glass or resin.

[0046] The filter film 30 is arranged on the side of the waveguide component 20 facing the light emitting component 10. Optionally, the filter film 30 can be directly attached to a surface of the waveguide substrate 21 facing the light emitting component 10, or the filter film 30 can be plated on a surface of the waveguide substrate 21 facing the light emitting component 10, thereby achieving the installation and fixation of the filter film 30. Alternatively, the waveguide cover plate 23 can be arranged on the side of the waveguide component 20 facing the light emitting component 10, and the filter film 30 can be attached or coated on a surface of the waveguide cover plate 23. In this way, the filter film 30 can be installed and fixed based on the component structure of the waveguide component 20 itself, so there is no need to set up other additional installation and fixing structures, which is conducive to reducing the volume and weight of the display device 100.

[0047] Specifically in the present embodiment, the filter film 30 has a light-blocking area 30a and a light-passing area 30b. The light-passing area 30b of the filter film 30 is located in the optical path from the light-emitting component 10 to the coupling-in area 20a, and the light-passing area 30b can be arranged to be light-transmissive, so that the imaging light emitted by the light-emitting component 10 can be transmitted to the coupling-in area 20a via the light-passing area 30b, and the light-blocking area 30a of the filter film 30 can block the stray light from being transmitted toward the waveguide component 20.

[0048] It is understandable that the technical solution of the present invention can block stray light from entering the waveguide component 20 without affecting the transmission of the imaging light emitted by the light emitting component 10 toward the human eye by providing the filter film 30, thereby ensuring the display effect of the display device 100. Since the technical solution of the present invention uses the filter film 30 to filter and isolate stray light, the filter film 30 occupies a smaller volume than the aperture, which is conducive to reducing the occupied volume of the display device 100.

[0049] See also Figures 1 to 5 In the embodiment of the present invention, the filter film 30 is light-proof and has a light-through hole 311, which is a light-through area 30b. The parts of the filter film 30 other than the light-through hole 311 are all light-blocking areas 30a.

[0050] By making the filter film 30 opaque, the filter film 30 can be used to block stray light from being transmitted toward the waveguide component 20. By setting a light-through hole 311 through the filter film 30, the imaging light emitted by the light-emitting component 10 can be transmitted toward the coupling-in area 20a of the waveguide component 20.

[0051] The light-through hole 311 may be rectangular, circular, elliptical or other shapes, which are not limited here. Preferably, when the optical axis direction of the light-emitting component 10 is inclined relative to the normal direction of the surface of the waveguide substrate 21, the light-through hole 311 may be elliptical; when the optical axis direction of the light-emitting component 10 is parallel to the normal direction of the surface of the waveguide substrate 21, the light-through hole 311 may be circular. By controlling the shape and size of the light-through hole 311, it can be matched with the effective spot size of the light-emitting component 10, so that it can be ensured that the imaging light emitted by the light-emitting component 10 can pass through the light-through hole 311 and be transmitted to the coupling-in area 20a of the waveguide component 20, and the light-blocking area of ​​the filter film 30 can be used to block the transmission of stray light. It can be understood that the light-through area 30b is formed by opening the light-through hole 311 on the filter film 30, which is conducive to reducing the processing difficulty of the filter film 30 and further reducing the weight of the filter film 30.

[0052] Of course, the technical solution of the present invention is not limited thereto. In another embodiment, at least a portion of the filter film 30 located on the light output path of the light output component 10 may be set to a light-transmitting material, and the area where the light-transmitting material is located is the light-transmitting area 30b. Optionally, the remaining filter film 30 located outside the light output path of the light output component 10 is set to an opaque material to form a corresponding light-blocking area 30a. The specific implementation method can be set according to actual needs and is not limited here.

[0053] In the embodiment of the present invention, the filter film 30 includes at least one reflective layer for reflecting stray light.

[0054] Optionally, the filter film 30 may be provided with only a single-layer reflective layer, so that the surfaces on both opposite sides of the filter film 30 can maintain a high reflectivity for the imaging light. In this case, the filter film 30 may be provided on the waveguide substrate 21 of the waveguide component 20, and the surface on the side away from the light output component 10 may be in contact with the surface of the waveguide substrate 21, so as to receive and reflect the internal imaging light of the waveguide substrate 21. Of course, the reflective surface 312 may also be provided on the waveguide cover plate 23 of the waveguide component 20, which is not limited here. The side of the filter film 30 away from the waveguide component 20 is used to reflect external stray light to block the stray light from being transmitted toward the waveguide component 20. In other embodiments, the filter film 30 may also be provided with multiple layers of reflective layers. In this way, the filtering and isolation effects of the filter film 30 on stray light can be further improved through the multiple layers of reflective layers.

[0055] In the embodiment of the present invention, the material of the reflective layer includes one of silver, chromium and aluminum. Of course, the material of the reflective layer can also be set to other materials with high reflectivity to visible light, such as polymer composite materials, which is not limited here.

[0056] In the embodiment of the present invention, the filter film 30 includes at least one light absorbing layer for absorbing stray light.

[0057] Optionally, the filter film 30 may be provided with only a single light absorbing layer, so that the surfaces on both opposite sides of the filter film 30 can maintain a high absorption rate for imaging light. In this case, the filter film 30 may be provided on the waveguide cover plate 23 of the waveguide component 20, and be spaced apart from the waveguide substrate 21. The side of the filter film 30 facing the light output component 10 is used to absorb external stray light to block the stray light from being transmitted toward the waveguide component 20. In other embodiments, the filter film 30 may also be provided with multiple light absorbing layers. In this way, the filtering and isolation effects of the filter film 30 on stray light can be further improved through the multiple light absorbing layers.

[0058] In one embodiment of the present invention, the material of the light absorbing layer includes one of silicon oxide and titanium oxide. Of course, the material of the light reflecting layer can also be set to other materials with high absorption rate of visible light, which is not limited here. Alternatively, in another embodiment of the present invention, a micro-nano structure is provided on the side of the filter film 30 facing the light emitting component, and the micro-nano structure can be, but is not limited to, a micro-nano structure of silicon, for absorbing the stray light. The specific implementation method can be set according to actual needs and is not limited here.

[0059] Optionally, in one embodiment of the present invention, the filter film 30 may be provided with only a light absorbing layer or a light reflecting layer, or may be provided with both a light absorbing layer and a light reflecting layer. For example, the filter film 30 may be provided with a light absorbing layer and a light reflecting layer in a stacked manner, the light reflecting layer may be attached to the waveguide substrate 21, and the light absorbing layer may be provided facing the light emitting component 10, which is not limited here.

[0060] In the embodiment of the present invention, the thickness of the filter film 30 is D, which satisfies: 100 nm≤D≤300 nm.

[0061] Specifically, the thickness of the filter film 30 may be in the range of 100 nm, 150 nm, 200 nm, 250 nm, 300 nm, and any value between 100 nm and 3000 nm. In this way, the thickness of the filter film 30 can be limited to prevent the filter film 30 from being too thin to affect its filtering and isolation effect on stray light, and at the same time, the filter film 30 can be prevented from being too thick to increase the cost, volume, and weight of the filter film 30.

[0062] See also Figures 1 to 4In an embodiment of the present invention, the waveguide component 20 includes a waveguide substrate 21 and a coupling grating 22. The waveguide substrate 21 is arranged on the light-emitting side of the light-emitting component 10, and the coupling grating 22 is arranged on a surface of the waveguide substrate 21 to form a coupling area 20a; the filter film 30 is attached to the surface of the waveguide substrate 21 facing the light-emitting component 10; the coupling grating 22 is arranged on the surface of the waveguide substrate 21 facing the light-emitting component 10, and is located in the light-transmitting area 30b; or, the coupling grating 22 is arranged on the surface of the waveguide substrate 21 facing away from the light-emitting component 10, and the light-transmitting area 30b is located on the coupling path of the coupling grating 22.

[0063] By allowing the filter film 30 to be attached to a surface of the waveguide substrate 21 , the filter film 30 can be directly installed and fixed through the waveguide substrate 21 of the waveguide component 20 .

[0064] In one embodiment, the filter film 30 and the coupling grating 22 can be simultaneously disposed on the side of the waveguide substrate 21 facing the light emitting component 10. In this case, a light through hole 311 can be disposed on the filter film 30, and the coupling grating 22 is located in the light through hole 311 of the filter film 30, and is used to receive the imaging light transmitted from the light emitting component 10 to the light through hole 311. Alternatively, at least a portion of the filter film 30 is configured as a light-transmitting material, and the area where the light-transmitting material is located is the light-transmitting area 30b, and the coupling grating 22 can be disposed on the side of the light-transmitting material facing the waveguide substrate 21.

[0065] In this configuration, since the filter film 30 and the coupling grating 22 are both located on the same side of the waveguide substrate 21 , the thickness of the overall structure formed by the waveguide component 20 and the filter film 30 can be reduced, thereby reducing the occupied volume of the display device 100 .

[0066] In another embodiment, the coupling grating 22 can be arranged on the side of the waveguide substrate 21 away from the light emitting component 10, and the filter film 30 is arranged on the side of the waveguide substrate 21 facing the light emitting component 10, and the light-passing area 30b of the filter film 30 is located on the coupling path of the coupling grating 22, so as to avoid the filter film 30 blocking the imaging light emitted from the light emitting component 10 toward the coupling area 20a, and ensure that the imaging light emitted by the light emitting component 10 can be received by the coupling grating 22, so as to ensure the light transmission efficiency. Among them, the light-passing area 30b can be a light hole 311, or can be a light-transmitting material, which is not limited here. By making the filter film 30 and the coupling grating 22 arranged on opposite sides of the waveguide substrate 21, it is helpful to reduce the difficulty of combining the waveguide component 20 and the filter film 30.

[0067] See also Figure 3In an embodiment of the present invention, the waveguide component 20 further includes a coupling-out grating, which is disposed on a surface of the waveguide substrate 21 and is used to couple out the imaging light coupled into the waveguide substrate 21 by the coupling-in region 20a; a reflection grating 32 is disposed on the side of the filter film 30 facing the waveguide substrate 21, and the reflection grating 32 is used to receive the imaging light coupled into the waveguide substrate 21 and not transmitted to the coupling-out grating, so that the imaging light can be reflected back to the coupling-out grating.

[0068] It should be noted that, among the imaging light coupled into the waveguide substrate 21 through the coupling-in grating 22, part of the coupled-in imaging light can be transmitted toward the coupling-out grating through total reflection in the substrate. Since the remaining imaging light is not transmitted to the coupling-out grating, it will affect the light transmission efficiency of the waveguide component 20. Therefore, the technical solution of the present invention is to set a reflection grating 32 on the side of the filter film 30 facing the waveguide substrate 21, so as to receive the imaging light that is not transmitted to the coupling-out grating in the waveguide substrate 21 through the reflection grating 32, and reflect it so that it can return to the coupling-out grating, thereby ensuring that the imaging light coupled into the waveguide substrate 21 is transmitted toward the coupling-out grating as much as possible, so as to improve the light transmission efficiency. The reflection grating 32 can be set to any one of the grating types such as straight grating, inclined grating, blazed grating, step grating, etc., which is not limited here.

[0069] In the embodiment of the present invention, the grating period of the coupling grating 22 is set to T1, and the grating period of the reflection grating 32 is set to T2, wherein T1 and T2 satisfy: T1=2T2.

[0070] Such an arrangement can make the imaging light reflected by the reflection grating 32 in the waveguide substrate 21 and the imaging light coupled in through the coupling grating 22 have the same transmission optical path, so as to further improve the light transmission efficiency of the waveguide component 20 .

[0071] In the embodiment of the present invention, at least a portion of the reflective grating 32 is embedded in the side of the filter film 30 facing the waveguide substrate 21. In this way, the reflective grating 32 and the filter film 30 can be arranged compactly to reduce the thickness of the overall structure formed by the reflective grating 32 and the filter film 30, thereby facilitating the reduction of the occupied volume of the display device 100.

[0072] In the embodiment of the present invention, a reflective surface 312 is formed on the side of the filter film 30 facing the waveguide substrate 21 for receiving and reflecting the internal imaging light of the waveguide component 20 .

[0073] Such an arrangement allows the side of the filter film 30 facing the light emitting component 10 to have a low transmittance to the imaging light while maintaining a high reflectivity to the imaging light in the waveguide substrate 21 , thereby facilitating the light transmission efficiency of the waveguide component 20 .

[0074] See also Figure 5 In an embodiment of the present invention, the waveguide component 20 includes a waveguide substrate 21 and a waveguide cover plate 23. The waveguide cover plate 23 is connected to the side of the waveguide substrate 21 facing the light output component 10, and the waveguide cover plate 23 can be light-transmissive. The filter film 30 is attached to at least one surface of the waveguide cover plate 23.

[0075] The waveguide cover plate 23 is used to cover the waveguide component 20 to improve the protection effect of the waveguide component 20. Specifically in this embodiment, the waveguide cover plate 23 may include a cover structure and a surrounding structure arranged around the circumference of the cover body, the cover structure and the waveguide component 20 are arranged relatively spaced apart, and the surrounding structure is used to be connected and fixed to the periphery of the waveguide component 20. In some embodiments, the thickness range of the waveguide cover plate 23 can be set to be less than or equal to 0.1 mm. By controlling the thickness of the waveguide cover plate 23, the weight and volume of the waveguide cover plate 23 can be made smaller, which is conducive to realizing the lightweight design of the waveguide component 20.

[0076] The present invention further provides a display device 100, which includes a light emitting component 10 and a waveguide component 20. The specific structure of the waveguide component 20 refers to the above embodiment. Since the display device 100 adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here. Among them, the light emitting component 10 is used to emit imaging light in a preset field of view angle range.

[0077] The light-emitting component 10 can be specifically set as a DLP optical engine, an LCOS optical engine, etc., and the emitted imaging light can be incident from the air medium to the coupling-in area 20a of the waveguide component 20, so that the imaging light is coupled into the diffraction optical waveguide through the coupling-in area 20a, and is transmitted toward the coupling-out area of ​​the waveguide component 20 by total reflection inside the diffraction optical waveguide, and then coupled out to the human eye through the coupling-out area, so that the human eye can receive the display image of the light-emitting component 10.

[0078] To ensure the image display effect of the display device 100, in one embodiment of the present invention, the optical axis direction of the light emitting component 10 is tilted relative to the normal direction of the surface of the waveguide substrate 21, the light-transmitting area 30b is approximately elliptical, and the projection of the exit pupil position of the light emitting component 10 on the plane where the light-transmitting area 30b is located is offset in the long axis direction of the light-transmitting area 30b relative to the center position of the light-transmitting area 30b.

[0079] It should be noted that by tilting the optical axis direction of the light emitting component 10 relative to the normal direction of the surface of the waveguide substrate 21, the light reflected by the waveguide component 20 can be deflected out of the range where the light emitting component 10 is located, so as to reduce the risk of the light being re-reflected back to the waveguide component 20 by the light emitting component 10, which is beneficial to achieve the effect of weakening ghost images, and thus can ensure the image display effect of the display device 100.

[0080] Since the optical axis direction of the light emitting component 10 is inclined relative to the normal direction of the surface of the waveguide substrate 21, the cross-sectional shape of the imaging light emitted by the light emitting component 10 when transmitted to the light-transmitting area is approximately elliptical. At this time, by making the light-transmitting area 30b approximately elliptical, the inner contour of the light-transmitting area 30b can be adapted to the contour of the imaging light that can pass through it, thereby ensuring that the filter film 30 blocks stray light and at the same time ensuring that the imaging light emitted by the light emitting component 10 can pass through the light-transmitting area 30b as much as possible to be received by the coupling-in area 20a of the waveguide component 20.

[0081] For example, in a preferred embodiment of the present invention, the distance from the exit pupil position of the light emitting component 10 to the waveguide component 20 is h1, the exit pupil radius of the light emitting component 10 is r1, the field of view angle of the light emitting component 10 is θ1, and the incident tilt angle of the light emitting component 10 is θ2.

[0082] Assuming that the offset of the intersection of the optical axis of the light emitting component 10 and the light passing area 30 b relative to the center of the light passing area 30 b is M, the following is satisfied: M=|h1|×tan(θ2 / 2).

[0083] Such an arrangement can make the center position of the light-passing area 30b match the light-emitting direction of the light-emitting component 10, so that the light-passing area 30b can receive and transmit the imaging light emitted by the light-emitting component 10 as much as possible, so that the imaging light can be transmitted toward the coupling-in area 20a of the waveguide component 20.

[0084] Furthermore, the major axis of the light-transmitting area 30b is set to r x , the short axis of the light-transmitting area 30b is r y , then it satisfies:

[0085] r x =r1+|h1|tan(θ1 / 2);

[0086] r y =r1cosθ2+0.5[(|h1|+r1sinθ2)tan(θ1 / 2+θ2)+(|h1|-r1sinθ2)tan(θ1 / 2-θ2)].

[0087] Such an arrangement can ensure that the imaging light emitted by the light emitting component 10 can be accurately aligned with the light-transmitting area 30b, and ensure that the light-transmitting area 30b is configured to conform to the cross-sectional shape of the imaging light emitted by the light emitting component 10 when it is transmitted to the light-transmitting area. This can ensure that the filter film 30 blocks stray light while ensuring that the imaging light emitted by the light emitting component 10 can pass through the light-transmitting area 30b as much as possible to be received by the coupling-in area 20a of the waveguide component 20.

[0088] Furthermore, since the optical axis direction of the light emitting component 10 is tilted relative to the normal direction of the surface of the waveguide substrate 21, it is also beneficial to prevent the reflected imaging light generated after the imaging light emitted by the light emitting component 10 is transmitted to the coupling-in area 20a from being reflected back to the light emitting component 10 along the original transmission path and reflected back to the coupling-in area 20a again, thereby reducing the risk of ghosting of the display device 100 and helping to ensure the display effect of the display device 100.

[0089] Of course, the technical solution of the present invention is not limited to this. In another embodiment of the present invention, the optical axis direction of the light emitting component 10 is arranged parallel to the normal direction of the surface of the waveguide substrate 21, the light-transmitting area 30b is circular, and the exit pupil position of the light emitting component 10 is arranged relative to the center position of the light-transmitting area 30b.

[0090] In this embodiment, the distance from the exit pupil position of the light emitting component 10 to the waveguide component 20 is set to h1, the exit pupil radius of the light emitting component 10 is r1, the field of view angle of the light emitting component 10 is θ1, and the radius of the light-transmitting area 30b is r2, then: r2=r1+|h1|×tan(θ1 / 2).

[0091] Such a configuration is conducive to ensuring that the imaging light emitted by the light emitting component 10 can be accurately aligned with the light-transmitting area 30b, so as to ensure that the filter film 30 blocks stray light while ensuring that the imaging light emitted by the light emitting component 10 can pass through the light-transmitting area 30b as much as possible. The specific implementation method can be set according to actual needs and is not limited here.

[0092] The present invention further proposes an augmented reality display device, which includes a display device 100. The specific structure of the display device 100 refers to the above embodiment. Since the augmented reality display device adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0093] The specific device type of the augmented reality display device is not limited in this embodiment. For example, the augmented reality display device can be a head-mounted display device such as AR glasses and AR helmets. The specific implementation method can be set according to actual needs.

[0094] The above description is only an exemplary embodiment of the present invention, and does not limit the patent scope of the present invention. All equivalent structural changes made by using the contents of the present invention specification and drawings under the technical concept of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A waveguide component, characterized in that: The waveguide component comprises an incoupling region and an outcoupling region, wherein the incoupling region is used to couple the imaging light emitted by the light-emitting component so that the imaging light propagates inside the waveguide component by total reflection, and the outcoupling region is used to couple the imaging light inside the waveguide component outward; Wherein, a filter film is provided on the surface of the waveguide component, and the filter film is located on the light incident path of the coupling-in region; The waveguide component comprises a waveguide substrate, an incoupling grating and an outcoupling grating, wherein the waveguide substrate is arranged on the light-emitting side of the light-emitting component, the incoupling grating and the outcoupling grating are arranged on the surface of the waveguide substrate respectively to form the incoupling region and the outcoupling region, and the filter film is arranged on the surface of the waveguide substrate facing the light-emitting component; The filter film has a light-blocking area and a light-transmitting area, wherein the light-blocking area is used to block stray light from being transmitted toward the waveguide component, and the light-transmitting area is used to allow the imaging light to be transmitted to the coupling-in area.

2. The waveguide component according to claim 1, wherein The filter film is light-proof and is provided with a light-through hole, which is the light-through area, and the parts of the filter film other than the light-through hole are all the light-blocking areas.

3. The waveguide component according to claim 2, characterized in that The filter film includes at least one reflective layer, the reflective layer is made of one of silver, chromium and aluminum, and is used to reflect the stray light; And / or, the filter film includes at least one light absorbing layer, the material of the light absorbing layer includes one of silicon oxide and titanium oxide, and is used to absorb the stray light; And / or, a micro-nano structure is provided on a side of the filter film facing the light emitting component to absorb the stray light.

4. The waveguide component according to any one of claims 1 to 3, characterized in that The thickness of the filter film is D, which satisfies: 100nm≤D≤300nm.

5. The waveguide component according to any one of claims 1 to 3, characterized in that The coupling-in grating is arranged on the surface of the waveguide substrate facing the light-emitting component and is located in the light-transmitting area; or, the coupling-in grating is arranged on the surface of the waveguide substrate facing away from the light-emitting component, and the light-transmitting area is located on the coupling-in path of the coupling-in grating.

6. The waveguide component according to claim 5, characterized in that A reflection grating is provided on the side of the filter film facing the waveguide substrate, and the reflection grating is used to receive imaging light that is coupled into the waveguide substrate and not transmitted to the outcoupling grating, so that the imaging light can be reflected back to the outcoupling grating.

7. The waveguide component according to claim 6, characterized in that The grating period of the coupling grating is set to T1, and the grating period of the reflection grating is set to T2, wherein T1 and T2 satisfy: T1=2T2; And / or, at least a portion of the reflective grating is embedded on a side of the filter film facing the waveguide substrate.

8. The waveguide component according to any one of claims 1 to 3, characterized in that The waveguide component further comprises a waveguide cover plate, the waveguide cover plate is connected to a side of the waveguide base facing the light emitting component, and the waveguide cover plate can be light-transmissive; The filter film is disposed on at least one surface of the waveguide cover plate.

9. A display device, characterized in that: It comprises a light emitting component and a waveguide component as claimed in any one of claims 1 to 8, wherein the light emitting component is used to emit imaging light to a light passing area of ​​the waveguide component within a preset field angle range.

10. The display device according to claim 9, characterized in that The optical axis direction of the light emitting component is inclined relative to the normal direction of the waveguide component surface, the light-transmitting area is approximately elliptical, and the projection of the exit pupil position of the light emitting component on the plane where the light-transmitting area is located is offset in the long axis direction of the light-transmitting area relative to the center position of the light-transmitting area.

11. The display device according to claim 10, wherein: The distance from the exit pupil position of the light emitting component to the waveguide component is h1, the exit pupil radius of the light emitting component is r1, the field of view angle of the light emitting component is θ1, the incident inclination angle of the light emitting component is θ2, and the offset of the intersection of the optical axis of the light emitting component and the light-transmitting area relative to the center of the light-transmitting area is M, then it satisfies: M=|h1|tan(θ2 / 2).

12. The display device according to claim 11, wherein: The major axis of the light-passing area is r x , the short axis of the light-passing area is r y , then it satisfies: r x =r1+|h1|tan(θ1 / 2); r y =r1cosθ2+0.5[(|h1|+r1sinθ2)tan(θ1 / 2+θ2)+(|h1|-r1sinθ2)tan(θ1 / 2-θ2)]。 13. An augmented reality display device, characterized in that: The invention comprises the display device as claimed in any one of claims 9 to 12.

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