Waveguide components, display devices, and augmented reality display equipment

Abstract

This invention discloses a waveguide component, a display device, and an augmented reality display apparatus, relating to the field of augmented reality technology. The waveguide component has an input region and an output region. The input region couples in imaging light emitted from a light-emitting component, allowing the imaging light to propagate internally through total internal reflection. The output region couples out the imaging light from inside the waveguide component. A filter film is provided on the surface of the waveguide component, located on the incident light path of the input region. The filter film has a light-blocking region and a light-transmitting region. The light-blocking region blocks stray light from propagating towards the waveguide component, while the light-transmitting region allows the imaging light to pass through to the input region. This invention provides a waveguide component with a filtering function, which can reduce the size of the display device while ensuring its display effect.

Description

Technical Field

[0001] This 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 Technology

[0002] In related technologies, display devices for enhanced display products typically include a light-emitting component and a waveguide component. The waveguide component receives and transmits the light emitted from the light-emitting component. To prevent stray light from entering the waveguide component and reaching the human eye, thus affecting the display effect, the display device usually needs to place an aperture inside the light-emitting component or between the light-emitting component and the waveguide component to filter and block stray light. However, this arrangement significantly increases the size and weight of the display device. Summary of the Invention

[0003] The main objective of this invention is to provide a waveguide component, a display device, and an augmented reality display device, with the aim of providing a waveguide component with a light filtering function to reduce the volume occupied by the display device and ensure the display effect of the display device.

[0004] To achieve the above objectives, the waveguide component proposed in this invention has a coupling-in region and a coupling-out region. The coupling-in region is used to couple in the imaging light emitted from the light-emitting component so that the imaging light propagates inside the waveguide component through total internal reflection. The coupling-out region is used to couple the imaging light inside the waveguide component outward.

[0005] The waveguide component has a filter film on its surface, which is located on the incident light path of the coupling region. The filter film has a light-blocking area and a light-transmitting area. 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 region.

[0006] In one embodiment, the filter film is opaque, and the filter film has a light-transmitting hole, which is the light-transmitting area. The portion of the filter film other than the light-transmitting hole is the light-blocking area.

[0007] In one embodiment, the filter film includes at least one reflective layer, the reflective layer being made of a material including silver, chromium, and aluminum, for reflecting the stray light;

[0008] And / or, the filter film includes at least one light-absorbing layer, the light-absorbing layer being made of one of silicon oxide and titanium oxide, for absorbing the stray light;

[0009] And / or, the filter film has a micro-nano structure on the side facing the light-emitting component for absorbing 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 includes a waveguide substrate, a coupling grating, and a coupling grating. The waveguide substrate is disposed on the light-emitting side of the light-emitting component. The coupling grating and the coupling grating are respectively disposed on the surface of the waveguide substrate to form the coupling region and the coupling region. The filter film is disposed on the surface of the waveguide substrate facing the light-emitting component.

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

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

[0014] In one embodiment, the grating period of the coupled grating is set to T1, and the grating period of the reflected 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 in the side of the filter film facing the waveguide substrate.

[0016] In one embodiment, the waveguide component includes a waveguide substrate and a waveguide cover plate, the waveguide cover plate being connected to the side of the waveguide substrate facing the light-emitting component, and the waveguide cover plate being light-transmitting;

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

[0018] The present invention also proposes a display device, including a light-emitting component and any one of the aforementioned waveguide components, wherein the light-emitting component is used to emit imaging light rays into the light-transmitting area of ​​the waveguide component within a preset field of view.

[0019] In one embodiment, the optical axis 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 of the light-emitting component onto the plane of the light-transmitting area is offset relative to the center position of the light-transmitting area along the long axis of the light-transmitting area.

[0020] In one embodiment, the distance from the exit pupil 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 tilt angle of the light-emitting component is θ2, and the offset of the intersection point 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 M = |h1|tan(θ2 / 2).

[0021] In one embodiment, the major axis of the light-transmitting region is r. x The minor axis of the light-transmitting region is r. y Then the following conditions are met:

[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 proposes an augmented reality display device, including any of the aforementioned display devices.

[0025] The waveguide component of this invention has a coupling-in region and a coupling-out region for receiving imaging light emitted from a light-emitting component. A filter film is provided on the side of the waveguide component facing the light-emitting component. The light-transmitting region of the filter film is located in the optical path from the light-emitting component to the coupling-in region, and the light-transmitting region is light-transmitting, allowing the imaging light emitted from the light-emitting component to be transmitted to the coupling-in region via the light-transmitting region. The light-blocking region of the filter film blocks stray light from propagating towards the waveguide component. Thus, without affecting the transmission of the imaging light emitted from the light-emitting component towards the human eye, the filter film blocks stray light from entering the waveguide component, thereby ensuring the display effect of the display device. Because the technical solution of this invention uses a filter film on the waveguide component to filter and isolate stray light, the waveguide component itself has a filtering function. Compared to an aperture stop, the film structure of the filter film makes it smaller in volume and lighter in weight, thus helping to reduce the size and weight of the display device. Attached Figure Description

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are 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 any creative work.

[0027] Figure 1This is a schematic diagram of the structure of the first embodiment of the 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 the display device provided by the present invention;

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

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

[0032] Explanation of icon numbers:

[0033] 100. Display device; 10. Light-emitting component; 20. Waveguide component; 20a. Coupling area; 21. Waveguide substrate; 22. Coupling grating; 23. Waveguide cover plate; 30. Filter film; 30a. Light-blocking area; 30b. Light-transmitting area; 31. Filter layer; 311. Light-transmitting hole; 312. Reflective surface; 32. Reflective grating.

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

[0035] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort 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 positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0037] Furthermore, if the embodiments of this invention involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the use of "and / or" or "and / or" throughout the text includes three parallel solutions. For example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0038] In related technologies, display devices for enhanced display products typically include a light-emitting component and a waveguide component. The waveguide component receives and transmits the light emitted from the light-emitting component. To prevent stray light from entering the waveguide component and reaching the human eye, thus affecting the display effect, the display device usually needs to place an aperture stop inside the light-emitting component or between the light-emitting component and the waveguide component to filter and block stray light. However, since the aperture stop is usually a screen structure with a certain volume and weight, installing it inside the display device would significantly increase the size and weight of the display device.

[0039] To this end, the present invention proposes a waveguide component. By adding a filter film to the surface of the waveguide component, the filter film can be used to filter and isolate stray light. Compared with the aperture, the film structure of the filter film makes it occupy less volume and lighter, thus helping to reduce the size and weight of the display device.

[0040] The waveguide component 20 of this application is described below with specific embodiments.

[0041] Please see Figures 1 to 5 In one embodiment of the present invention, the waveguide component 20 has a coupling-in region 20a and a coupling-out region. The coupling-in region 20a is used to receive the imaging light emitted from the light-emitting component 10 so that the imaging light propagates inside the waveguide component 20 through total internal reflection. The coupling-out region is used to couple the imaging light inside the waveguide component 20 outward. A filter film 30 is provided on the side of the waveguide component 20 facing the light-emitting component 10. The filter film 30 has a light-blocking region 30a and a light-transmitting region 30b. The light-blocking region 30a is used to block stray light from propagating toward the waveguide component 20. The light-transmitting region 30b is located in the optical path from the light-emitting component 10 to the coupling-in region 20a so that the imaging light emitted from the light-emitting component 10 can be transmitted through the filter film 30 and transmitted to the coupling-in region 20a.

[0042] In this embodiment, the waveguide component 20 may include a diffractive waveguide, which can serve as the optical transmission structure of the display device. The diffractive waveguide has a coupling-in region 20a and a coupling-out region. The coupling-in region 20a is disposed on the light-emitting path of the light-emitting component 10 and is used to receive the imaging light carrying image information emitted by the light-emitting component.

[0043] The light-emitting component 10 provides incident light to the waveguide component 20. Specifically, it can be a DLP optical engine, LCOS optical engine, etc. The imaging light emitted by it can be incident from the air medium to the coupling region 20a of the waveguide component 20, so that the imaging light is coupled into the interior of the diffractive waveguide through the coupling region 20a, and then transmitted towards the coupling region of the waveguide component 20 through total internal reflection inside the diffractive waveguide, and then coupled out to the human eye through the coupling region, so that the human eye can receive the display image of the light-emitting component 10.

[0044] Specifically, in this embodiment, the diffractive waveguide includes a waveguide substrate 21, a coupling grating 22, and a coupling grating. The waveguide substrate 21, also known as a dielectric waveguide, can be planar with two opposing side surfaces, or it can be cylindrical or other shapes. The coupling grating 22 and the coupling grating can be disposed on any surface of the waveguide substrate 21 to form the coupling region 20a or the coupling region of the waveguide component 20. The coupling grating 22 can change the incident angle of the imaging light entering the waveguide substrate 21, so that the incident angle is greater than or equal to the critical angle, allowing the imaging light to undergo total internal reflection within the waveguide substrate 21. The coupling grating can couple the imaging light outward from the waveguide substrate 21. The coupling grating 22 and the coupling grating can be attached to the waveguide substrate 21 as separate optical elements, or they can be fabricated on the waveguide substrate 21. The input grating 22 and the output grating can be any type of grating, such as a straight grating, a tilted grating, a blazed grating, or a stepped grating, and are not limited here.

[0045] In some embodiments, the waveguide component 20 may further include a waveguide cover plate 23 disposed on one side of the diffractive waveguide to improve the protective performance of the waveguide component 20. The waveguide cover plate 23 is typically a light-transmitting structure, and its material may be, but is not limited to, light-transmitting materials such as glass or resin.

[0046] The filter film 30 is disposed on the side of the waveguide component 20 facing the light-emitting component 10. Optionally, the filter film 30 can be directly attached to the surface of the waveguide substrate 21 facing the light-emitting component 10, or the filter film 30 can be plated on the 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 disposed on the side of the waveguide component 20 facing the light-emitting component 10, and the filter film 30 can be attached to or coated on the surface of the waveguide cover plate 23. With this arrangement, the filter film 30 can be installed and fixed by relying on the component structure of the waveguide component 20 itself, so there is no need to set up other installation and fixing structures, which helps to reduce the size and weight of the display device 100.

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

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

[0049] Please see Figures 1 to 5 In an embodiment of the present invention, the filter film 30 is set to be opaque, and the filter film has a light-transmitting hole 311, which is a light-transmitting area 30b. The part of the filter film 30 other than the light-transmitting hole 311 is a light-blocking area 30a.

[0050] By making the filter film 30 opaque, stray light can be blocked from being transmitted toward the waveguide component 20. By providing a light-transmitting hole 311 through the filter film 30, the imaging light emitted from the light-emitting component 10 can be transmitted toward the coupling region 20a of the waveguide component 20.

[0051] The light-transmitting aperture 311 can be rectangular, circular, elliptical, or other shapes, and is not limited thereto. Preferably, when the optical axis of the light-emitting component 10 is inclined relative to the normal direction of the waveguide substrate 21 surface, the light-transmitting aperture 311 can be elliptical; when the optical axis of the light-emitting component 10 is parallel to the normal direction of the waveguide substrate 21 surface, the light-transmitting aperture 311 can be circular. By controlling the shape and size of the light-transmitting aperture 311, it can be matched with the effective spot size of the light-emitting component 10. This ensures that the imaging light emitted from the light-emitting component 10 can pass through the light-transmitting aperture 311 and be transmitted to the coupling region 20a of the waveguide component 20, and the light-blocking region of the filter film 30 can be used to block the transmission of stray light. It is understood that forming the light-transmitting region 30b by opening the light-transmitting aperture 311 on the filter film 30 helps to reduce the processing difficulty of the filter film 30 and further reduce the weight of the filter film 30.

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

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

[0054] Optionally, the filter 30 may have only a single reflective layer to ensure that both opposite surfaces of the filter 30 maintain high reflectivity for imaging light. In this case, the filter 30 may be disposed on the waveguide substrate 21 of the waveguide component 20, with its surface facing away from the light-emitting component 10 adhering to the surface of the waveguide substrate 21 to receive and reflect the internal imaging light of the waveguide substrate 21. Alternatively, this reflective surface 312 may also be disposed on the waveguide cover plate 23 of the waveguide component 20; this is not limited here. The side of the filter 30 facing away from the waveguide component 20 reflects external stray light to block stray light from propagating towards the waveguide component 20. In other embodiments, the filter 30 may also have multiple reflective layers. This configuration further enhances the filtering and blocking effect of the filter 30 on stray light through multiple reflective layers.

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

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

[0057] Optionally, the filter 30 may have only a single light-absorbing layer, so that both opposite surfaces of the filter 30 can maintain a high absorption rate for imaging light. In this case, the filter 30 may be disposed on the waveguide cover plate 23 of the waveguide component 20 and spaced apart from the waveguide substrate 21. The side of the filter 30 facing the light-emitting component 10 is used to absorb external stray light to block stray light from propagating toward the waveguide component 20. In other embodiments, the filter 30 may also have multiple light-absorbing layers. This configuration can further improve the filtering and blocking effect of the filter 30 on stray light through multiple light-absorbing layers.

[0058] In one embodiment of the present invention, the material of the light-absorbing layer includes silicon oxide and titanium oxide. Of course, the material of the reflective layer can also be other materials with high absorption rates for visible light, and is not limited here. Alternatively, in another embodiment of the present invention, the filter film 30 has a micro / nano structure on the side facing the light-emitting component. This micro / nano structure can be, but is not limited to, a silicon micro / nano structure, used to absorb the stray light. Specific implementation methods can be set according to actual needs and are not limited here.

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

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

[0061] Specifically, the thickness of the filter film 30 can be any value between 100nm, 150nm, 200nm, 250nm, 300nm, and 100nm to 3000nm. This setting limits the thickness of the filter film 30, preventing it from being too thin and affecting its filtering and blocking effect on stray light, while also preventing it from being too thick and increasing its cost, size, and weight.

[0062] Please see 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 disposed on the light-emitting side of the light-emitting component 10, and the coupling grating 22 is disposed on a surface of the waveguide substrate 21 to form a coupling region 20a. A filter film 30 is attached to the surface of the waveguide substrate 21 facing the light-emitting component 10. The coupling grating 22 is disposed on the surface of the waveguide substrate 21 facing the light-emitting component 10 and is located within the light-transmitting region 30b. Alternatively, the coupling grating 22 is disposed on the surface of the waveguide substrate 21 away from the light-emitting component 10, and the light-transmitting region 30b is located on the coupling path of the coupling grating 22.

[0063] In this way, by allowing the filter film 30 to be attached to one 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, the filter film 30 can be provided with a light-transmitting hole 311, and the coupling grating 22 is located within the light-transmitting hole 311 of the filter film 30 to receive the imaging light transmitted from the light-emitting component 10 to the light-transmitting hole 311. Alternatively, at least a portion of the filter film 30 can be made of a light-transmitting material, and the area where the light-transmitting material is located is the light-transmitting region 30b. The coupling grating 22 can be disposed on the side of the light-transmitting material facing the waveguide substrate 21.

[0065] With this configuration, since the filter film 30 and the coupling grating 22 are both located on the same side of the waveguide substrate 21, it is beneficial to reduce the thickness of the overall structure formed by the combination of the waveguide component 20 and the filter film 30, thereby reducing the volume occupied by the display device 100.

[0066] In another embodiment, the coupling grating 22 can be disposed on the side of the waveguide substrate 21 away from the light-emitting component 10, while the filter film 30 is disposed on the side of the waveguide substrate 21 facing the light-emitting component 10. The light-transmitting area 30b of the filter film 30 is located on the coupling path of the coupling grating 22 to prevent the filter film 30 from blocking the imaging light emitted from the light-emitting component 10 toward the coupling area 20a, ensuring that the imaging light emitted from the light-emitting component 10 can be received by the coupling grating 22, thereby ensuring light transmission efficiency. The light-transmitting area 30b can be a light-transmitting aperture 311 or a light-transmitting material, and is not limited here. By disposing the filter film 30 and the coupling grating 22 on opposite sides of the waveguide substrate 21, the difficulty of combining the waveguide component 20 and the filter film 30 is reduced.

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

[0068] It should be noted that among the imaging rays coupled to the waveguide substrate 21 via the coupling grating 22, a portion of the coupled imaging rays can be transmitted towards the output grating within the substrate through total internal reflection. Since the remaining imaging rays do not transmit towards the output grating, this affects the optical transmission efficiency of the waveguide component 20. Therefore, the technical solution of this invention provides a reflective grating 32 on the side of the filter film 30 facing the waveguide substrate 21. This reflective grating 32 receives the imaging rays within the waveguide substrate 21 that do not transmit towards the output grating and reflects them back to the output grating. This ensures that the imaging rays coupled to the waveguide substrate 21 are transmitted towards the output grating as much as possible, thereby improving optical transmission efficiency. The reflective grating 32 can be any type of grating, such as a straight grating, a tilted grating, a blazed grating, or a stepped grating, and is not limited here.

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

[0070] This configuration allows the imaging light reflected by the reflection grating 32 within the waveguide substrate 21 to have the same transmission optical path as the imaging light coupled in through the coupling grating 22, thereby further improving the optical transmission efficiency of the waveguide component 20.

[0071] In an 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. This arrangement allows the reflective grating 32 and the filter film 30 to be arranged compactly, thereby reducing the thickness of the overall structure formed by the combination of the reflective grating 32 and the filter film 30, which in turn helps to reduce the volume occupied by the display device 100.

[0072] In an 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] This configuration allows the filter film 30 to have low transmittance for imaging light on the side facing the light-emitting component 10, while maintaining high reflectivity for imaging light in the waveguide substrate 21, thereby helping to ensure the light transmission efficiency of the waveguide component 20.

[0074] Please see 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-emitting component 10, and the waveguide cover plate 23 is light-transmitting. A 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 of the waveguide component 20. Specifically, in this embodiment, the waveguide cover plate 23 may include a cover structure and a surrounding edge structure arranged circumferentially around the cover. The cover structure is spaced apart from the waveguide component 20, and the surrounding edge structure is used to connect and fix to the periphery of the waveguide component 20. In some embodiments, the thickness of the waveguide cover plate 23 may be less than or equal to 0.1 mm. By controlling the thickness of the waveguide cover plate 23, its weight and volume can be reduced, which is beneficial for achieving a lightweight design of the waveguide component 20.

[0076] The present invention also proposes a display device 100, which includes a light-emitting component 10 and a waveguide component 20. The specific structure of the waveguide component 20 is as described in the above embodiments. Since the display device 100 adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here. The light-emitting component 10 is used to emit imaging light within a preset field of view.

[0077] The light-emitting component 10 can be specifically configured as a DLP optical engine, LCOS optical engine, etc. The imaging light emitted from it can be incident from the air medium to the coupling region 20a of the waveguide component 20, so that the imaging light is coupled into the interior of the diffraction waveguide through the coupling region 20a, and then transmitted towards the coupling region of the waveguide component 20 through total internal reflection inside the diffraction waveguide, and then coupled out to the human eye through the coupling region, 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 inclined 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 onto the plane where the light-transmitting area 30b is located is offset relative to the center position of the light-transmitting area 30b along the long axis direction of the light-transmitting area 30b.

[0079] It should be noted that by tilting the optical axis of the light-emitting component 10 relative to the normal direction of the waveguide substrate 21 surface, the light reflected by the waveguide component 20 can be deflected out of the range of the light-emitting component 10, thereby reducing the risk of the light being reflected back to the waveguide component 20 by the light-emitting component 10. This helps to reduce the ghosting effect and thus ensures the image display effect of the display device 100.

[0080] Since the optical axis of the light-emitting component 10 is inclined relative to the normal direction of the waveguide substrate 21, the cross-sectional shape of the imaging light emitted from the light-emitting component 10 at 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. Thus, while ensuring the blocking effect of the filter film 30 on stray light, it can be ensured that the imaging light emitted from the light-emitting component 10 can pass through the light-transmitting area 30b as much as possible and be received by the coupling 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] If the offset of the intersection point of the optical axis of the light-emitting component 10 and the light-transmitting area 30b relative to the center of the light-transmitting area 30b is set to M, then the following condition is satisfied: M=|h1|×tan(θ2 / 2).

[0083] This configuration allows the center of the light-transmitting area 30b to match the light-emitting direction of the light-emitting component 10, so that the light-transmitting area 30b can receive and transmit the imaging light emitted from the light-emitting component 10 as much as possible, so that the imaging light can be transmitted toward the coupling area 20a of the waveguide component 20.

[0084] Furthermore, the major axis of the light-transmitting area 30b is set to r. x The minor axis of the light-transmitting region 30b is r. y Then the following conditions are met:

[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] This configuration ensures that the imaging light emitted from the light-emitting component 10 is precisely aligned with the light-transmitting area 30b, and ensures that the cross-sectional shape of the light-transmitting area 30b and the imaging light emitted from the light-emitting component 10 are similarly shaped when they are transmitted to the light-transmitting area. This ensures that while the filter film 30 blocks stray light, the imaging light emitted from the light-emitting component 10 can pass through the light-transmitting area 30b as much as possible and be received by the coupling area 20a of the waveguide component 20.

[0088] Furthermore, since the optical axis of the light-emitting component 10 is tilted relative to the normal direction of the waveguide substrate 21 surface, it is also beneficial to avoid the reflected imaging light generated after the imaging light emitted from the light-emitting component 10 is transmitted to the coupling region 20a and reflected back to the light-emitting component 10 along the original transmission path, and then reflected back to the coupling region 20a again. This can reduce the risk of ghosting in the display device 100 and help 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 opposite 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, the following conditions are met: r2=r1+|h1|×tan(θ1 / 2).

[0091] This configuration helps ensure that the imaging light emitted from the light-emitting component 10 is precisely aligned with the light-transmitting area 30b, thus ensuring that the filter film 30 blocks stray light while allowing the imaging light emitted from the light-emitting component 10 to pass through the light-transmitting area 30b as much as possible. Specific implementation methods can be customized according to actual needs and are not limited here.

[0092] The present invention also proposes an augmented reality display device, which includes a display device 100. The specific structure of the display device 100 is as described in the above embodiments. Since the present augmented reality display device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0093] This embodiment does not limit the specific type of augmented reality display device. For example, the augmented reality display device can be AR glasses, AR helmets, or other head-mounted display devices. The specific implementation can be set according to actual needs.

[0094] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A display device, characterized in that, It includes a light-emitting component and a waveguide component. The light-emitting component is used to emit imaging light into the light-transmitting area of ​​the waveguide component within a preset field of view. The waveguide component has a coupling-in area and a coupling-out area. The coupling-in area is used to couple in the imaging light emitted from the light-emitting component so that the imaging light propagates inside the waveguide component through total internal reflection. The coupling-out area is used to couple the imaging light inside the waveguide component outward. The waveguide component has a filter film on its surface, and the filter film is located on the incident light path of the coupling region; The waveguide component includes a waveguide substrate, a coupling grating, and a coupling grating. The waveguide substrate is disposed on the light-emitting side of the light-emitting component. The coupling grating and the coupling grating are respectively disposed on the surface of the waveguide substrate to form the coupling region and the coupling region. The filter film is disposed 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. 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 area. The optical axis of the light-emitting component is inclined relative to the normal direction of the waveguide component surface. The light-transmitting area is approximately elliptical. The projection of the exit pupil of the light-emitting component onto the plane of the light-transmitting area is offset relative to the center position of the light-transmitting area along the long axis of the light-transmitting area. The distance from the exit pupil 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 tilt angle of the light-emitting component is θ2, and the offset of the intersection point 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, the following condition is satisfied: M=|h1|tan(θ2 / 2). The major axis of the light-transmitting area is r. x The minor axis of the light-transmitting region is r. y Then the following condition is met: r x =r1+ |h1|tan(θ1 / 2); r y =r1cosθ2 + 0.5[(|h1|+r1sinθ2)tan(θ1 / 2+θ2)+(|h1|-r1sinθ2)tan(θ1 / 2-θ2)]。 2. The display device as claimed in claim 1, characterized in that, The filter film is set to be opaque, and the filter film has light-transmitting holes, which are the light-transmitting areas. The portion of the filter film other than the light-transmitting holes is the light-blocking area.

3. The display device as claimed in claim 2, characterized in that, The filter film includes at least one reflective layer, the reflective layer being 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 light-absorbing layer being made of one of silicon oxide and titanium oxide, for absorbing the stray light; And / or, the filter film has a micro-nano structure on the side facing the light-emitting component for absorbing the stray light.

4. The display device as claimed in any one of claims 1 to 3, characterized in that, The thickness of the filter film is D, which satisfies the following condition: 100nm ≤ D ≤ 300nm.

5. The display device as claimed in any one of claims 1 to 3, characterized in that, The coupling grating is disposed on the surface of the waveguide substrate facing the light-emitting component and located within the light-transmitting region; or, the coupling grating is disposed on the surface of the waveguide substrate away from the light-emitting component, and the light-transmitting region is located on the coupling path of the coupling grating.

6. The display device as claimed in claim 5, characterized in that, The filter film has a reflective grating on the side facing the waveguide substrate. The reflective grating is used to receive imaging light rays coupled into the waveguide substrate but not transmitted to the output grating, so that the imaging light rays can be reflected back to the output grating.

7. The display device as claimed in claim 6, characterized in that, The grating period of the coupled grating is set to T1, and the grating period of the reflected grating is set to T2, wherein T1 and T2 satisfy: T1=2T2; And / or, at least a portion of the reflective grating is embedded in the side of the filter film facing the waveguide substrate.

8. The display device as claimed in any one of claims 1 to 3, characterized in that, The waveguide component also includes a waveguide cover plate, which is connected to the side of the waveguide substrate facing the light-emitting component, and the waveguide cover plate is light-transmitting; The filter film is disposed on at least one surface of the waveguide cover plate.

9. An augmented reality display device, characterized in that, The display device includes any one of claims 1 to 8.

Images