Optical waveguide lens and display device using same

Abstract

The invention relates to the technical field of display, and provides an optical waveguide lens and a display device applying the optical waveguide lens, the optical waveguide lens comprises a lens body, a first side of the lens body is provided with a first reflection type filtering film layer, a second side of the lens body is provided with a second reflection type filtering film layer, and image light or light source light enters from the end face of the lens body and is reflected by the second reflection type filtering film layer. The red light, the green light and the blue light are reflected between the first reflective filtering film layer and the second reflective filtering film layer, so that the reflectivity of the red light, the green light and the blue light is improved, the brightness of the light is improved, and an image is brighter and clearer.

Description

Technical Field

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

[0002] Optical waveguide lenses are a type of display lens that can be used in various display devices, such as virtual reality glasses and front-light display devices. However, due to unreasonable or insufficiently optimized structural designs of existing optical waveguide lenses, the images in these display devices are often low in brightness and unclear, affecting the viewing experience. Summary of the Invention

[0003] The main objective of this application is to provide an optical waveguide lens to solve the problems of low image brightness and clarity of existing optical waveguide lenses.

[0004] One embodiment of this application provides an optical waveguide lens, comprising:

[0005] A lens body, the lens body including a first side and a second side disposed opposite to each other;

[0006] A first reflective filter layer is located on a first side of the lens body. The first reflective filter layer is used to reflect at least a portion of the red, green, and blue light of the image light or light source light entering the lens body.

[0007] And a second reflective filter layer, the second reflective filter layer being located on the second side of the lens body, the second reflective filter layer being used to reflect at least a portion of the red, green and blue light of the image light or light source light entering the lens body;

[0008] One end of the lens body is used to receive the image light or light source light. The first reflective filter layer and the second reflective filter layer receive the image light or light source light and reflect the red light, green light and blue light at least once.

[0009] In one embodiment, the wavelength of the red light is set to 620nm-630nm, the wavelength of the green light is set to 525nm-540nm, and the wavelength of the blue light is set to 450nm-460nm.

[0010] In one embodiment, a second side of the lens body is used to allow external light to enter, and a third reflective filter layer is further provided on the side of the second reflective filter layer opposite to the lens body. The third reflective filter layer is used to reflect infrared and ultraviolet rays from the external light to prevent the infrared and ultraviolet rays from entering the lens body.

[0011] In one embodiment, an antireflective coating and / or a polarizing coating are disposed between the second reflective filter layer and the third reflective filter layer. The antireflective coating and / or polarizing coating are used to allow external light to pass through and enter the lens body. The polarizing coating is used to eliminate the polarization of the external light, and the antireflective coating is used to improve the transmittance of the external light.

[0012] One embodiment of this application provides an extended reality display device, including the optical waveguide lens described in any of the above claims, and further comprising:

[0013] An optical engine is used to emit image light rays and direct the image light rays into the lens body from one end of the lens body;

[0014] A first grating is disposed at one end of the optical waveguide lens. The first grating receives the image light and directs it into the lens body. The first reflective filter layer and the second reflective filter layer reflect all red, green and blue light of the image light entering the lens body at least once.

[0015] A second grating is disposed in the middle of the optical waveguide lens. The second grating receives the red light, green light and blue light reflected by the first reflective filter layer and the second reflective filter layer, and forms an image from them before projecting it into the human eye.

[0016] In one embodiment, a second side of the lens body is used to allow external light to enter. A filter layer is also provided on the side of the second reflective filter layer opposite to the lens body. The filter layer is used to allow the external light to pass through and enter the lens body. The filter layer is used to filter red, green, and blue light from the external light to prevent the red, green, and blue light from entering the lens body. The wavelengths of the red, green, and blue light from the external light are the same as the wavelengths of the red, green, and blue light from the image light.

[0017] One embodiment of this application provides a front light source display device, including the optical waveguide lens described in any of the above claims, and further comprising:

[0018] A light source is used to emit light rays and direct the light rays into the lens body from one end of the lens body;

[0019] The lens body includes a display screen for displaying images, the display screen being located on a first side of the lens body; after the first reflective filter layer and the second reflective filter layer reflect at least one portion of the red, green, and blue light entering the lens body, the first reflective filter layer directs the light from the light source toward the display screen to illuminate the display screen.

[0020] In one embodiment, the first reflective filter layer and the second reflective filter layer have a preset reflection angle;

[0021] When the incident angle of the light received by the first reflective filter layer and the second reflective filter layer is less than or equal to the reflection angle, the first reflective filter layer and the second reflective filter layer partially reflect the light.

[0022] When the incident angle of the light received by the first reflective filter layer and the second reflective filter layer is greater than the reflection angle, the first reflective filter layer and the second reflective filter layer perform total internal reflection of the incident light.

[0023] In one embodiment, the light source is located in a direction perpendicular to one end face of the lens, and the light emitted by the light source enters the optical waveguide lens from the end face of the optical waveguide lens.

[0024] In one embodiment, the light source is a blue LED light source located on a first side of the lens body. A reflective film layer is provided at one end of the lens body. The reflective film layer has a reflective surface that reflects the light emitted by the light source. The reflective surface forms an angle with the end face of the lens body so that the light source enters the lens body from the end face of the lens body. The reflective surface is also provided with a phosphor layer.

[0025] According to the optical waveguide lens of the above embodiment, a first reflective filter layer is provided on the first side of the lens body, and a second reflective filter layer is provided on the second side of the lens body. After the image light or the light source enters from the end face of the lens body, its red light, green light and blue light are reflected between the first reflective filter layer and the second reflective filter layer, which improves the reflectivity of red light, green light and blue light, and enhances the brightness of the light, thereby making the image brighter and clearer. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of the optical waveguide lens in this application;

[0027] Figure 2 This is a schematic diagram of the extended reality display device of this application;

[0028] Figure 3 This is a schematic diagram of the structure of the side-emitting front light source display device of this application;

[0029] Figure 4 This is a schematic diagram of the structure of the bottom-emitting front light source display device of this application;

[0030] Figure 5This is a schematic diagram illustrating the reflectance principle of the phosphor layer in this application.

[0031] Figure label:

[0032] 10. Lens body; 11. First reflective filter layer; 12. Second reflective filter layer; 13. Third reflective filter layer; 14. Anti-reflective coating layer; 15. Polarizing coating layer; 16. First protective layer; 17. Second protective layer;

[0033] 20. Optical mechanism; 21. First grating; 22. Second grating; 23. Filter film layer;

[0034] 30. Light source; 31. Display screen; 32. Reflective film layer; 33. Phosphor layer. Detailed Implementation

[0035] The present invention will now be described in further detail with reference to specific embodiments and accompanying drawings. Similar elements in different embodiments are referred to by associated similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of this application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to this application are not shown or described in the specification. This is to avoid obscuring the core parts of this application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0036] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.

[0037] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0038] Optical waveguide lenses are transparent dielectric lenses with specific optical conduction functions, and they are commonly used in various display devices. However, existing optical waveguide lenses cannot achieve selective reflection and transmission of specific wavelengths of light, resulting in severe light interference, insufficient display brightness, and negatively impacting the user and viewing experience.

[0039] One embodiment of this application provides an optical waveguide lens, including a lens body and a first reflective filter layer and a second reflective filter layer disposed on both sides of the lens body. When external image light or light from a light source enters the lens body, the first reflective filter layer and the second reflective filter layer located on both sides of the lens body will completely reflect or partially reflect the main light contained in the image light or light source light, thereby increasing the reflectivity of the image light or light source light in the lens body, so as to improve the brightness and clarity of the image.

[0040] The reflection of image light or light source light by the first and second reflective filter layers can be set according to the corresponding wavelength of the main light rays contained in the image light or light source light. For example, when the wavelength of the main light rays contained in the image light or light source light is 400nm-700nm, the first and second reflective filter layers can be set to reflect light only within this wavelength range, improving the reflection efficiency of this specific wavelength and thus increasing the brightness of the image light or light source light. Simultaneously, the first and second reflective filter layers can be set to selectively reflect total or partial light within the aforementioned wavelength range according to actual production needs. A higher reflectivity results in higher light brightness, while a lower reflectivity increases the transmittance of light within the aforementioned wavelength range.

[0041] In some embodiments, reference Figure 1 In this optical waveguide lens, the X-direction light is external light, and the Y-direction light is infrared and ultraviolet light from the external light that are reflected. The lens body 10 includes a lens body 10, a first reflective filter layer 11, and a second reflective filter layer 12. The lens body 10 includes a first side and a second side disposed opposite to each other. The first reflective filter layer 11 is located on the first side of the lens body 10 and is used to reflect at least a portion of the red, green, and blue light from the image light or light source 30 entering the lens body 10. The second reflective filter layer 12 is located on the second side of the lens body 10 and is used to reflect at least a portion of the red, green, and blue light from the image light or light source 30 entering the lens body 10. One end of the lens body 10 is used for receiving image light or light source 30 light. The first reflective filter layer 11 and the second reflective filter layer 12 receive the image light or light source 30 light and reflect its red, green, and blue light at least once.

[0042] Existing optical waveguide lenses do not have directional reflection structures designed for the core rays of image light or light source 30, resulting in easy scattering and leakage of light during transmission and very low utilization. In this application, the first reflective filter layer 11 and the second reflective filter layer 12 are specifically designed to reflect the main red, green, and blue light in the image light or light source 30, which can greatly improve the reflection efficiency of the target light and solve the problem of insufficient display brightness in the prior art. The first and second sides of the lens body 10 are arranged opposite each other, and the reflective filter layers 23 on both sides form a bidirectional reflection channel. Image light or light source 30 rays entering from one end of the lens body 10 will undergo at least one reflection between the two layers, preventing light from directly penetrating the lens and ensuring that the light is directionally transmitted to the target area along the interior of the lens body 10, thereby improving the clarity and stability of the displayed image. As for light with wavelengths different from the aforementioned red, green, and blue light, it can still pass through the lens normally without affecting the normal observation of the external scene or the supplementary lighting for the display device.

[0043] Furthermore, this application includes a first reflective filter layer 23 and a second reflective filter layer 23 that reflect light of a specific wavelength. These can be manufactured using existing processing techniques. By setting the material, thickness, and number of layers, the reflectivity and reflectance of the film layer for different wavelengths can be adjusted. The film layer is composed of alternating layers of high-refractive-index materials (such as TiO2, Nb2O5) and low-refractive-index materials (such as SiO2). The optical thickness (refractive index × physical thickness) of each layer matches 1 / 4 (or an integer multiple thereof) of the target reflection wavelength. When light shines on the surface of the film layer, it will be reflected twice on the upper and lower surfaces of the film layer. The optical path difference between these two reflected beams is exactly equal to the target wavelength, thus they superimpose (constructive interference), maximizing the reflection intensity. Light of non-standard wavelengths, because it does not meet the condition that the optical thickness = 1 / 4 wavelength, will have an optical path difference between the two reflected beams that is an integer multiple of the target wavelength, thus canceling each other out (destructive interference), resulting in extremely low reflection intensity, with most of it penetrating the film layer. For example, taking a target light wavelength of 450nm as an example, the optical thickness of the film = 450nm / 4 = 112.5nm. Taking SiO2 as an example, its refractive index is approximately 1.46, so its physical thickness = 112.5nm / 1.46 ≈ 77nm. The reflectivity of the final film can be adjusted by alternately stacking high-refractive-index and low-refractive-index films.

[0044] In some embodiments, the wavelength of red light is set to 620nm-630nm, the wavelength of green light is set to 525nm-540nm, and the wavelength of blue light is set to 450nm-460nm. Currently, the core emission wavelengths of most optical engines 20 and LED light sources 30 on the market are concentrated in the above wavelength range. By clearly defining the wavelength range, the optical waveguide lens of this application can be directly adapted to existing mature light sources 30, reducing the adaptation cost with end products. Meanwhile,

[0045] In some embodiments, reference is made to Figure 1 The second side of the lens body 10 is used to allow external light to enter. The second reflective filter layer 12 is provided with a third reflective filter layer 13 on the side opposite to the lens body 10. The third reflective filter layer 13 is used to reflect infrared and ultraviolet rays from the external light to prevent infrared and ultraviolet rays from entering the lens body 10.

[0046] Infrared and ultraviolet rays in ambient light can damage the human eye. By incorporating a third reflective filter layer 13, these rays are completely blocked from the outside of the lens body 10, preventing them from penetrating the lens body 10 and causing damage to the eyes. Simultaneously, infrared rays have a thermal effect; if they directly enter the lens body 10, they can cause the lens temperature to rise, leading to problems such as filter layer detachment and optical parameter drift. The third reflective filter layer 13, by reflecting infrared rays, can suppress the temperature rise of the lens body 10, preventing the filter layer and lens body 10 from aging due to high temperatures and extending the product's lifespan.

[0047] In some embodiments, reference is made to Figure 1 An antireflective coating layer 14 and / or a polarizing coating layer 15 are disposed between the second reflective filter layer 12 and the third reflective filter layer 13. The antireflective coating layer 14 and / or the polarizing coating layer 15 allow external light to pass through and enter the lens body 10. The polarizing coating layer 15 eliminates the polarization of external light, and the antireflective coating layer 14 increases the transmittance of external light. Depending on the actual application scenario, in some embodiments, only the antireflective coating layer 14 or only the polarizing coating layer 15 may be disposed between the second reflective filter layer 12 and the third reflective filter layer 13. In some embodiments, both the antireflective coating layer 14 and the polarizing coating layer 15 may be disposed between the second reflective filter layer 12 and the third reflective filter layer 13, wherein the antireflective coating layer 14 and the polarizing coating layer 15 are stacked sequentially, and their positions can be interchanged.

[0048] Polarized light exists in ambient light, which can cause glare, blurring, and reduced contrast in external scenes, particularly affecting the application of waveguide lenses in virtual reality or augmented reality glasses. The polarizing film layer 15 selectively absorbs polarized light in a specific direction, allowing only effective light perpendicular to the polarization direction to pass through, completely eliminating glare and stray reflections, and improving the detail clarity of the external scene. In some embodiments, the polarizing film layer 15 can be made of PVA film that has been iodine-dyed and stretched to achieve selective absorption of polarized light in a specific direction. The polarization direction can be chosen to be parallel to the plane of the lens body 10 to ensure absorption of horizontally polarized light, adapting to most types of polarized light interference in everyday scenarios.

[0049] The antireflective coating 14 significantly improves the overall transmittance of visible light by reducing the reflection loss of external light at the coating interface. This enhances the transmittance of external light through the lens, making the external scene appear brighter and the colors more realistic, especially useful in virtual reality or augmented reality glasses applications. In applications using the front light source 30, it can completely replace the light source 30 for supplemental lighting when there is sufficient external light, further reducing power consumption. In some embodiments, the antireflective coating 14 can be made of different materials, such as SiO2 or TiO2, depending on the actual transmittance requirements.

[0050] In some embodiments, reference is made to Figure 1 The outermost layers of the first and second sides of the lens body 10 are provided with a first protective layer 16 and a second protective layer 17. The first protective layer 16 and the second protective layer 17 can be configured as waterproof, anti-fog, or hardened coating layers according to the actual needs of the lens to enhance the protection of the lens. For example, perfluoropolyether hydrophobic film, silica-based hydrophilic film, zirconium oxide + silica composite film, etc.

[0051] In extended reality display devices, such as extended reality glasses, optical waveguide lenses are a crucial component for image display. However, existing extended reality devices do not differentiate between wavelengths of light. The optical fiber in the optical engine 20 experiences severe scattering during transmission within the lens, resulting in extremely low utilization and low brightness of the virtual image, making it unusable in bright outdoor environments. Furthermore, external light interferes with the light from the optical engine 20, causing unclear images.

[0052] One embodiment of this application provides an extended reality display device, referencing... Figure 2 In this configuration, the light rays in the X direction are external light rays, the light rays in the Y direction are reflected infrared and ultraviolet light from the external light source, and the light rays in the Z direction are reflected red, green, and blue light from the external light source. In some embodiments, the extended reality device includes any of the above-mentioned waveguide lenses, and further includes an optomechanical system 20, a first grating 21, and a second grating 22.

[0053] The optical engine 20 is used to emit image light and direct the image light from one end of the lens body 10 into the lens body 10. A first grating 21 is disposed at one end of the optical waveguide lens. The first grating 21 receives the image light and directs it into the lens body 10. A first reflective filter layer 11 and a second reflective filter layer reflect all red, green, and blue light of the image light entering the lens body 10 at least once. A second grating 22 is disposed in the middle of the optical waveguide lens. The second grating 22 receives the red, green, and blue light reflected by the first reflective filter layer 11 and the second reflective filter layer 12, forms an image, and directs it towards the human eye.

[0054] In this application, the optomechanical system 20 can provide image display content for the lens. It can be a micro OLED or microLED, a transmissive LCD or a reflective LCOS, or a bright image device such as DLP or LBS. The first grating 21 and the second grating 22 can be directly processed onto the lens body 10, integrated with the lens body 10, ensuring the optical continuity of the lens body 10. (Reference) Figure 2 The image light emitted by the optical engine 20 is directed towards the first grating 21 at the incident end of the optical waveguide lens. The first grating 21, through diffraction, efficiently couples the light into the lens body 10, with the refraction direction parallel to the lens body 10, ensuring the light can contact the reflective filter layers 23 on both sides. When the image light entering the lens body 10 reaches the second reflective filter layer 12, it is efficiently reflected due to wavelength matching. The reflected light continues to propagate to the first reflective filter layer 11 and is reflected again. Similarly, when the image light entering the lens body 10 reaches the first reflective filter layer 11, it is efficiently reflected due to wavelength matching. The reflected light continues to propagate to the second reflective filter layer 12 and is reflected again. This forms a back-and-forth reflection transmission path, where the image light can be reflected at least once, or multiple times depending on the actual image requirements, for example, more than five times. During transmission, there is no scattering or leakage of light, greatly improving the utilization rate of the image light and thus effectively enhancing image brightness. In this embodiment, the first reflective filter layer 11 and the second reflective filter layer 12 can be configured to be totally reflective in order to improve the image brightness. The image light after multiple reflections is transmitted to the second grating 22 in the middle of the lens. The second grating 22 directs the light to the human eye through diffraction, forming a clear virtual image.

[0055] In ambient light, there is stray light with the same wavelength as the image light from the optical engine 20. This stray light can overlap with the light in the virtual image, causing a decrease in image contrast, ghosting, or color distortion. (See some embodiments for reference.) Figure 2The second side of the lens body 10 is used to allow external light to enter. The second reflective filter layer 12 is also provided with a filter layer 23 on the side opposite to the lens body 10. The filter layer 23 is used to allow external light to pass through and enter the lens body 10. The filter layer 23 is used to filter the red, green and blue light of the external light to prevent the red, green and blue light of the external light from entering the lens body 10. The wavelengths of the red, green and blue light of the external light are the same as the wavelengths of the red, green and blue light of the image light.

[0056] In this application, the filter layer 23 can specifically block external light rays with the same wavelength as the image light from the optical engine 20, allowing only other wavelengths of visible light to pass through, greatly reducing interference light in the virtual image and improving contrast and image clarity. Moreover, the filter layer 23 can transmit other visible light without affecting the color integrity and brightness of the external scene, so that the real scene observed by the human eye remains natural and realistic, ensuring that the virtual image and the external image do not interfere with each other, thus enhancing the user experience.

[0057] refer to Figure 2 In some embodiments of this application, a third reflective filter layer 13, an anti-reflection layer 14, and a polarizing layer 15 may be provided on the side of the second reflective filter layer 12 away from the lens body 10. The specific implementation of these layers has been described above. The layers are stacked sequentially, and their positions can be adjusted according to the requirements of the actual image, which will not be repeated here.

[0058] Existing front light source 30 display devices, such as reflective LCD screens 31 which offer advantages in eye protection and power saving, have long been unable to achieve large-scale mass production due to the lack of efficient front light source 30 waveguide lenses. Meanwhile, existing mature backlights 30 or front light sources 30 used in electronic paper (e-ink screens) either have high power consumption or can only be adapted to low-resolution scenarios without animated video displays (such as electronic paper, which has large image grain and low resolution, and therefore does not have strict requirements for the front light source 30).

[0059] One embodiment of this application provides a front light source 30 display device, referenced... Figure 3 In this configuration, the light rays in the X direction are external light rays, and the light rays in the Y direction are reflected infrared and ultraviolet rays from the external light sources. The front light source 30 display device includes any of the aforementioned waveguide lenses, as well as the light source 30 and the display screen 31.

[0060] The light source 30 is used to emit light from the light source 30 and direct the light from the light source 30 into the lens body 10 from one end. The display screen 31 is used to display images and is located on the first side of the lens body 10. After the first reflective filter layer 11 and the second reflective filter layer 12 reflect at least one portion of the red, green, and blue light from the light source 30 entering the lens body 10, the first reflective filter layer 11 directs the light from the light source 30 toward the display screen 31 to illuminate the display screen 31.

[0061] refer to Figure 3 The light emitted by the light source 30 enters the incident end face of the optical waveguide lens 10. After entering the lens body 10, the light propagates to the second reflective filter layer 12, where it is efficiently reflected due to wavelength matching. The reflected light then continues to propagate to the first reflective filter layer 11, where it is reflected again. Similarly, after entering the lens body 10, the light propagates to the first reflective filter layer 11, where it is efficiently reflected due to wavelength matching. The reflected light then continues to propagate to the second reflective filter layer 12, where it is reflected again, forming a "back-and-forth reflection" transmission path. The light source 30 can be reflected at least once, or multiple times depending on the actual image requirements, for example, three or more times, to ensure uniform diffusion of the light within the lens body 10. The uniformly diffused light penetrates the first reflective filter layer 11 and strikes the display screen 31, illuminating it and displaying a clear image.

[0062] When there is sufficient ambient light, the light source 30 can be turned on, and the ambient light can directly illuminate the display screen 31 after passing through the optical waveguide lens, thus presenting a clear image.

[0063] In order to enable the light from the light source 30, which has been reflected multiple times within the lens body 10, to be output to the display screen 31 to illuminate it, the reflectivity and transmittance of the first reflective filter layer 11 can be set to an appropriate ratio, for example, the reflectivity and transmittance each account for 50%. While satisfying the reflection of the light from the light source 30, the reflected light from the light source 30 can be directed to the display screen 31 to illuminate it.

[0064] Meanwhile, to facilitate the transmission of image light output from the display screen 31 through the optical waveguide lens for normal user observation, the first reflective filter layer 11 and the second reflective filter layer 12 are configured for non-total internal reflection of light of specific wavelengths. In some embodiments, the first reflective filter layer 11 and the second reflective filter layer 12 have preset reflection angles. When the incident angle of the light received by the first reflective filter layer 11 and the second reflective filter layer 12 is less than or equal to the reflection angle, the first reflective filter layer 11 and the second reflective filter layer 12 partially reflect the light. When the incident angle of the light received by the first reflective filter layer 11 and the second reflective filter layer 12 is greater than the reflection angle, the first reflective filter layer 11 and the second reflective filter layer 12 perform total internal reflection of the incident light.

[0065] Specifically, the reflection angle can correspond to the viewing angle when the user observes the display screen 31. For example, the viewing angle of the user observing the display screen 31 is usually 0°-90°, and the incident angle of the light when it hits the first reflective filter layer 11 and the second reflective filter layer 12 is also usually 0°-90°. Assuming that the actual viewing angle of the user observing the display screen 31 is 60°, the reflection angle is set to 60°. When the incident angle of the light received by the first reflective filter layer 11 and the second reflective filter layer 12 is less than or equal to the reflection angle, the first reflective filter layer 11 and the second reflective filter layer 12 partially reflect the light so that the image can pass through the optical waveguide lens for the user to observe. Conversely, light with an incident angle greater than the emission angle, even if it can pass through the optical waveguide lens, will not fall into the user's viewing angle, so that it is reflected multiple times in the optical waveguide lens to meet the incident angle requirement before being emitted.

[0066] In some embodiments, the position of the light source 30 can be configured according to the structure of the actual display device; it can be located on both sides of the optical waveguide lens or at both ends of the optical waveguide lens. In some embodiments, reference... Figure 3 The light source 30 is located perpendicular to one end face of the lens, and the light emitted by the light source 30 enters the optical waveguide lens from the end face of the optical waveguide lens. In this application, the light source 30 is incident perpendicular to the end face of the lens, the light propagation direction is parallel to the lens body 10, the incident angle is stable, and the perpendicularly incident light propagates in a more regular direction within the lens.

[0067] In some embodiments, reference is made to Figure 4In this configuration, the light rays in the X direction are external light rays, while the light rays in the Y direction are reflected infrared and ultraviolet rays from the external light rays. The light source 30 is located on the first side of the lens body 10. One end of the lens body 10 is provided with a reflective film layer 32. The reflective film layer 32 has a reflective surface that reflects the light rays emitted by the light source 30. The reflective surface forms an angle with the end face of the lens body 10, allowing the light rays from the end face of the lens body 10 to enter the lens body 10. In this application, the light source 30 is integrated on the first side of the lens body 10, on the same side as the display screen 31. The light is guided to the end face through the angle reflection of the reflective film layer 32, eliminating the need for additional end face and side space. The light source 30 does not need to be fixed to the end face of the lens and its installation position on the first side can be flexibly adjusted according to the device's shape. The angle of the reflective film layer 32 can also be finely adjusted as needed to adapt to special-shaped devices such as "irregular screens, foldable screens, and curved screens."

[0068] In some embodiments, reference Figure 4 and Figure 5 The light source 30 is a blue LED light source 30, located on the first side of the lens body 10. A reflective film layer 32 is provided at one end of the lens body 10. The reflective film layer 32 has a reflective surface that reflects the light emitted by the light source 30. The reflective surface forms an angle with the end face of the lens body 10, so that the light from the light source 30 enters the lens body 10 from the end face. A phosphor layer 33 is also provided on the reflective surface.

[0069] Existing blue LED light sources 30 emit light by exciting a blue LED chip into white light through an encapsulated phosphor. In the manufacturing process of the blue LED light source 30, the phosphor is mixed with adhesive and then coated onto the blue LED chip. Therefore, the phosphor adhesive must be relatively thick to allow for greater blue light excitation; otherwise, the phosphor will not be sufficient to completely convert the blue light into white light. The amount of phosphor adhesive determines the efficiency of blue light excitation into white light. However, excessive phosphor adhesive, due to its greater thickness, significantly obstructs light utilization, thus affecting the brightness. In this application, after the blue LED emits light, it shines onto the phosphor layer 33. Since the phosphor layer 33 is coated on the reflective layer, its thickness can be very thin, greatly reducing the obstruction of blue light. After the blue light excites the phosphor into white light, it is reflected by the reflective layer, which greatly improves the efficiency of blue light excitation of the phosphor, thereby increasing the brightness.

[0070] refer to Figure 3 and Figure 4In some embodiments of this application, a third reflective filter layer 13, an anti-reflection layer 14, and a polarizing layer 15 may be provided on the side of the second reflective filter layer 12 away from the lens body 10. The specific implementation of these layers has been described above. The layers are stacked sequentially, and their positions can be adjusted according to the requirements of the actual image, which will not be repeated here.

[0071] The above examples illustrate the present invention only to aid in understanding it and are not intended to limit the scope of the invention. Those skilled in the art can make various simple deductions, modifications, or substitutions based on the principles of this invention.

Claims

1. An optical waveguide mirror, comprising: The application relates to a light waveguide lens, which comprises: a lens body, which comprises oppositely arranged first and second sides; a first reflective light filtering film layer arranged on the first side of the lens body, which is used for reflecting at least part of red light, green light and blue light of image light or light source light entering the lens body; and a second reflective light filtering film layer arranged on the second side of the lens body, which is used for reflecting at least part of red light, green light and blue light of image light or light source light entering the lens body; one end of the lens body is used for emitting the image light or light source light, and the first reflective light filtering film layer and the second reflective light filtering film layer receive the image light or light source light and reflect the red light, green light and blue light at least once.

2. The optical waveguide mirror of claim 1, wherein, The wavelength of the red light is set to 620-630 nm, the wavelength of the green light is set to 525-540 nm, and the wavelength of the blue light is set to 450-460 nm.

3. The optical waveguide mirror of claim 1, wherein, The second side of the lens body is used for emitting external light, and the side, away from the lens body, of the second reflective light filtering film layer is further provided with a third reflective light filtering film layer, which is used for reflecting infrared light and ultraviolet light of the external light to prevent the infrared light and ultraviolet light from entering the lens body.

4. The optical waveguide mirror of claim 3, wherein, An antireflection film layer and / or a polarized film layer are arranged between the second reflective light filtering film layer and the third reflective light filtering film layer, the antireflection film layer and / or the polarized film layer are used for allowing the external light to pass through and then enter the lens body, the polarized film layer is used for eliminating polarized light of the external light, and the antireflection film layer is used for improving the transmittance of the external light.

5. An extended reality display device, comprising: The application further relates to a light waveguide lens, which comprises the light waveguide lens according to any one of claims 1-4 and further comprises: an optical machine, which is used for emitting image light and emitting the image light from one end of the lens body into the lens body; a first grating arranged at one end of the light waveguide lens, which receives the image light and emits the image light into the lens body, and the first reflective light filtering film layer and the second reflective light filtering film reflect all red light, green light and blue light of the image light emitted into the lens body at least once; and a second grating arranged at the middle of the light waveguide lens, which receives the red light, green light and blue light reflected by the first reflective light filtering film layer and the second reflective light filtering film layer, emits the red light, green light and blue light to form an image, and then emits the image to human eyes.

6. The extended reality display device of claim 5, wherein, The second side of the lens body is used for emitting external light, and the side, away from the lens body, of the second reflective light filtering film layer is further provided with a light filtering film layer, which is used for allowing the external light to pass through and then enter the lens body, the light filtering film layer is used for filtering red light, green light and blue light of the external light to prevent the red light, green light and blue light of the external light from entering the lens body, and the wavelength of the red light, green light and blue light of the external light is the same as that of the image light.

7. A front light display device, characterized by comprising: The optical waveguide glasses according to any one of claims 1-4, further comprising: a light source for emitting light source light and emitting the light source light into the glass body from one end of the glass body; and a display screen for displaying images, the display screen being located on the first side of the glass body; the first reflective filter film layer and the second reflective filter film layer reflect part of red light, green light and blue light of the light source light entering the glass body at least once, and the first reflective filter film layer emits the light source light to the display screen to illuminate the display screen.

8. The front light display device according to claim 7, wherein The first reflective filter film layer and the second reflective filter film layer have a preset reflection angle; When the incident angle of the light received by the first reflective filter film layer and the second reflective filter film layer is less than or equal to the reflection angle, the first reflective filter film layer and the second reflective filter film layer partially reflect the light; When the incident angle of the light received by the first reflective filter film layer and the second reflective filter film layer is greater than the reflection angle, the first reflective filter film layer and the second reflective filter film layer totally reflect the incident light.

9. The front light display device according to claim 8, wherein The light source is located in a direction perpendicular to the end surface of the glass body, and the light source light emitted by the light source is emitted into the optical waveguide glass from the end surface of the optical waveguide glass.

10. The front light display device according to claim 8, wherein The light source is a blue LED light source, the light source is located on the first side of the glass body, one end of the glass body is provided with a reflective film layer, the reflective film layer has a reflective surface for reflecting the light source light emitted by the light source, the reflective surface forms an angle with the end surface of the glass body to emit the light source light into the glass body from the end surface of the glass body, and the reflective surface is further provided with a fluorescent powder layer.

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