Large FOV optical display system and wearable device

Abstract

The utility model provides a large FOV optical display system and a wearable device, and belongs to the technical field of optical imaging, the optical display system comprises a display unit, and a first transmitting mirror, a first optical element, a second transmitting mirror and a reflecting mirror which are sequentially arranged on a light emitting path of the display unit, and also comprises a first prism and a second prism, the first prism is arranged on a reflected light path of the first optical element, the second prism is arranged on the rear side of the first prism, a first phase delay film, a first polarization reflection film and an absorption film are sequentially arranged between the first prism and the second prism, the first phase delay film is attached to the rear surface of the first prism, and the absorption film is attached to the front surface of the second prism. The optical system is compact in structure, light in weight, low in stray, good in imaging quality and large in field angle, and the user experience is greatly improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of optical imaging, and in particular relates to a large FOV optical display system and a wearable device. Background Art

[0002] Augmented Reality (AR) is a technology that combines optical devices with computer technology to overlay the real world with the virtual world. This technology allows users to interact with both the real world and the virtual world at the same time, giving users a new interactive experience. The penetrating optical display system is one of the core technologies in the field of augmented reality. Currently, wearable devices using augmented display technology have been widely used in games, retail, education, industry, and medical fields.

[0003] At present, penetrating optical display technology can be divided into geometric optics solutions: Birdbath, ordinary reflective prism, free-form surface prism and other solutions and diffraction optics-based array optical waveguide, diffraction optical waveguide and other solutions. Among them, the idea of ​​geometric optics is mature in technology, convenient device processing, and small assembly tolerance requirements compared to the diffraction solution. However, this type of solution is limited by the light source device and the overall size, weight, and price requirements of the AR system. There are generally problems such as size, price, small field of view, performance, and observation distance that cannot be taken into account. The displayed content is easy to leak and the confidentiality is poor. These shortcomings have reduced the user experience of augmented reality wearable devices. Utility Model Content

[0004] The purpose of the embodiment of the utility model is to provide a large FOV optical display system with small size, good imaging quality and large field of view angle range.

[0005] Another purpose of the embodiments of the present utility model is to provide a wearable device that is easy to wear, can be adapted to myopic users, and enhances user experience and immersion.

[0006] The implementation mode of the utility model is achieved as follows:

[0007] An embodiment of the utility model provides a large FOV optical display system, comprising a display unit and a first transmission mirror, a first optical element, a second transmission mirror and a reflection mirror which are sequentially arranged on the light output path of the display unit, and further comprising a first prism and a second prism, wherein the first prism is arranged on the reflected light path of the first optical element and is located on the same side of the first optical element as the reflection mirror, the reflected light of the first optical element is incident from the upper surface of the first prism into the interior thereof, the rear surface of the first prism faces the human eye and is an inclined surface obliquely facing forward, the second prism is arranged on the rear side of the first prism, the front surface of the second prism is an inclined surface and corresponds to the rear surface of the first prism, the rear surface of the second prism faces the human eye, a first phase delay film, a first polarized reflection film and an absorption film are sequentially arranged between the first prism and the second prism, the first phase delay film is bonded to the rear surface of the first prism, and the absorption film is bonded to the front surface of the second prism.

[0008] Optionally, the front surface of the first prism is provided with a partially transmissive and partially reflective film or a fully reflective film.

[0009] Optionally, the front surface of the first prism is a curved surface, and the radius of curvature is R, where |R|≤100 mm.

[0010] Optionally, a third transmission mirror is provided on the optical path between the first optical element and the first prism.

[0011] Optionally, a matte film layer is provided on the lower surface of the second prism.

[0012] Optionally, the first optical element includes a first optical lens, a second polarized reflective film, a third polarized reflective film, a second phase delay film and an anti-reflection film;

[0013] The second polarizing reflective film is arranged on a side of the first optical lens close to the display unit, the third polarizing reflective film is arranged on a side of the first optical lens away from the display unit, the second phase delay film is arranged on a side of the third polarizing reflective film away from the first optical lens, and the number of anti-reflection films is two and they are respectively arranged on a side of the second polarizing reflective film away from the first optical lens and a side of the second phase delay film away from the first optical lens.

[0014] An embodiment of the present utility model further provides a wearable device, comprising a wearable component and the above-mentioned large FOV optical display system, wherein the optical display system is arranged on the wearable component.

[0015] The beneficial effects of the utility model are:

[0016] The large FOV optical display system provided by the embodiment of the utility model has a compact structure, light weight, low stray light, good imaging quality, and a large field of view that can reach more than 70°, which greatly improves the user experience.

[0017] The wearable device provided by the embodiment of the utility model has a simple production process, low cost, and is easy to wear, which greatly improves the wearing experience of the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 This is a schematic diagram of the optical architecture of a large FOV optical display system according to the first embodiment of the present utility model;

[0019] In the figure: 1-display unit; 2-first transmission mirror; 3-first optical element; 31-first optical lens; 32-second polarizing reflective film; 33-third polarizing reflective film; 34-second phase delay film; 35-anti-reflection film; 4-second transmission mirror; 5-reflector; 6-first prism; 61-first phase delay film; 62-first polarizing reflective film; 63-absorption film; 7-second prism; 8-third transmission mirror. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the embodiments of the present invention clearer, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0021] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features thereof may be combined with each other.

[0022] In the description of the present utility model, it should be noted that the terms "inside", "outside", "front", "back", "upper", "lower", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, or the orientation or position relationship commonly understood by those skilled in the art, which is only for the convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. Example 1

[0023] refer to Figure 1As shown, the first embodiment of the utility model provides a large FOV optical display system, including a display unit 1, a first transmission mirror 2, a first optical element 3, a second transmission mirror 4, a reflection mirror 5, a first prism 6, and a second prism 7.

[0024] The display unit 1 mainly plays the role of emitting light. The display unit 1 can display 2D or 3D images or videos, etc. The display unit 1 can adopt an OLED display, an LCD display, an LCOS display, a micro-LED display or a mini-LED display, etc.

[0025] The first transmission mirror 2 is arranged on the light path of the display unit 1. The first transmission mirror 2 is used to control the light, improve image quality parameters such as image distortion and resolution, and reduce the system volume. The number of the first transmission mirror 2 can be only one, or two or more.

[0026] The first transmission mirror 2 can be made of plastic or glass. The two side surfaces of the first transmission mirror 2 can be processed into spherical surfaces, aspherical surfaces, free-form surfaces or Fresnel surfaces.

[0027] The first optical element 3 is arranged on the optical path of the transmitted light of the first transmission mirror 2, and the angle formed by the optical axis of the first optical element 3 and the optical axis of the first transmission mirror 2 is 20°-70°, preferably 45°.

[0028] The first optical element 3 includes a first optical lens 31, a second polarizing reflective film 32, a third polarizing reflective film 33, a second phase delay film 34 and an anti-reflection film 35. The second polarizing reflective film 32 is arranged on a side of the first optical lens 31 close to the display unit 1, the third polarizing reflective film 33 is arranged on a side of the first optical lens 31 away from the display unit 1, the second phase delay film 34 is arranged on a side of the third polarizing reflective film 33 away from the first optical lens 31, and the number of anti-reflection films 35 is two and they are arranged on a side of the second polarizing reflective film 32 away from the first optical lens 31 and a side of the second phase delay film 34 away from the first optical lens 31, respectively.

[0029] The second transmission mirror 4 is arranged on the transmission light path of the first optical element 3, and the reflector 5 is arranged on the transmission light path of the second transmission mirror 4. The second transmission mirror 4 is used to control the light and improve image quality parameters such as image distortion and resolution. The reflector 5 is used to reflect the light.

[0030] The first prism 6 is a triangular prism structure, which can be made into a solid prism structure or a hollow prism structure. When it is made into a hollow prism structure, the interior thereof is filled with optical liquid or gas. The first prism 6 is arranged on the light path of the reflected light of the first optical element 3. The first prism 6 and the reflector 5 are located on the same side of the first optical element 3. The upper surface of the first prism 6 faces the first optical element 3. The reflected light of the first optical element 3 enters the interior of the first prism 6 from the upper surface. The rear surface of the first prism 6 faces the human eye. The rear surface of the first prism 6 is an inclined surface that is obliquely downward from the back to the front. The front surface of the first prism 6 is provided with a partially transmissive and partially reflective film. Of course, a total reflection film can also be provided on the front surface of the first prism 6.

[0031] The front surface of the first prism 6 is a curved surface, and the radius of curvature is R1, where |R1|<100 mm.

[0032] The upper surface and the rear surface of the first prism 6 are spherical, aspherical, free-form or Fresnel surfaces, and are processed as required.

[0033] The second prism 7 is a prism-like structure, which can be made into a solid prism structure or a hollow prism structure. When it is made into a hollow prism structure, its interior is filled with optical liquid or gas. The second prism 7 is arranged below the rear side of the first prism 6, and the front surface of the second prism 7 is an inclined surface that is inclined downward from the back to the front; the front surface of the second prism 7 corresponds to the rear surface of the first prism 6, the rear surface of the second prism 7 faces the human eye, and the lower surface of the second prism 7 faces downward. The lower surface of the second prism 7 is provided with a matte film layer, which can be formed by ink coating, or by plating a light-absorbing film, or by pasting a light-absorbing film sheet.

[0034] The lower surface, the front surface and the rear surface of the second prism 7 are spherical surfaces, aspherical surfaces, free-form surfaces or Fresnel surfaces, and are processed as required.

[0035] A first phase delay film 61, a first polarizing reflective film 62 and an absorption film 63 are sequentially arranged between the first prism 6 and the second prism 7. The first phase delay film 61 is attached to the rear surface of the first prism 6, and the absorption film 63 is attached to the front surface of the second prism 7. The first phase delay film 61 is used to change the polarization characteristics of light. The first polarizing reflective film 62 is used to reflect light of a certain normal state. The absorption film 63 is used to absorb external stray light.

[0036] A third transmission mirror 8 may also be provided on the optical path between the first optical element 3 and the first prism 6. The third transmission mirror 8 is used to control the light and improve image quality parameters such as image distortion and resolution.

[0037] The imaging principle of the optical display system of this embodiment is as follows:

[0038] The light emitted by the display unit 1 is first processed by the first transmission mirror 2 and then transmitted, and then enters the first optical element 3. After being processed by the first optical element 3, it is transmitted out and enters the second transmission mirror 4, and then transmitted from the second transmission mirror 4 to the reflector 5. The light is reflected at the reflector 5, and then enters the second transmission mirror 4 again for processing and then transmitted out. After entering the first optical element 3 again for processing and then reflected, the light reflected from the first optical element 3 enters the third transmission mirror 8. The light transmitted from the third transmission mirror 8 is incident from the upper surface of the first prism 6 into its interior, and first propagates toward the rear surface of the first prism 6 in its interior, and is reflected for the first time at the first polarized reflection film. The light after the first reflection propagates toward the front surface of the first prism 6, and then is reflected for the second time at the front surface. The light reflected for the second time passes through the rear surface of the first prism 6, the first phase delay film 61, the first polarized reflection film 62, and the absorption film 63 in sequence, and then enters the second prism 7 from the front surface of the second prism 7, and finally transmits from the rear surface of the second prism 7 to reach the human eye, forming a virtual image with a specific magnification. Example 2

[0039] A second embodiment of the present invention provides a wearable device, including a wearable component and an optical display system.

[0040] It should be noted that the optical display system in this embodiment can adopt the optical display system in Example 1. Its structure, working principle and technical effects produced refer to the corresponding contents in Example 1 and are not described in detail here.

[0041] The optical display system is set on the wearable component. The wearable component can be a helmet or a glasses frame, etc., which is convenient for people to wear on their heads. Of course, the head-mounted display device also includes a control unit, a storage unit, etc. The control unit is used to control the device, and the storage unit is used to store images, videos, etc.

[0042] It should be noted that the present application does not limit the application of the optical display system to a head-mounted display device. The system can also be applied to other devices. In one possible application scenario, it can also be integrated with a desktop-level optical display device and a vehicle-mounted optical display device. The virtual image distance is farther, which can realize the eye protection function and enhance the viewing experience.

[0043] The utility model is not limited to the above optional implementation modes, and anyone can derive other various forms of products under the enlightenment of the utility model. The above specific implementation modes should not be understood as limiting the protection scope of the utility model. The protection scope of the utility model shall be based on the definition in the claims, and the description can be used to interpret the claims.

Claims

1. A large FOV optical display system, characterized in that: The invention comprises a display unit and a first transmission mirror, a first optical element, a second transmission mirror and a reflection mirror which are sequentially arranged on the light output path of the display unit, and also comprises a first prism and a second prism, wherein the first prism is arranged on the light output path of the reflected light of the first optical element and is located on the same side of the first optical element as the reflection mirror, the reflected light of the first optical element is incident on the first prism from the upper surface thereof, the rear surface of the first prism faces the human eye and is an inclined surface obliquely facing forward, the second prism is arranged on the rear side of the first prism, the front surface of the second prism is an inclined surface and corresponds to the rear surface of the first prism, the rear surface of the second prism faces the human eye, a first phase delay film, a first polarized reflection film and an absorption film are sequentially arranged between the first prism and the second prism, the first phase delay film is bonded to the rear surface of the first prism, and the absorption film is bonded to the front surface of the second prism.

2. The large FOV optical display system according to claim 1, characterized in that: The front surface of the first prism is provided with a partially transmissive and partially reflective film or a totally reflective film.

3. The large FOV optical display system according to claim 1, characterized in that: The front surface of the first prism is a curved surface, and the curvature radius thereof is R, where |R|≤100 mm.

4. The large FOV optical display system according to claim 1, characterized in that: A third transmission mirror is arranged on the optical path between the first optical element and the first prism.

5. The large FOV optical display system according to claim 1, characterized in that: The lower surface of the second prism is provided with a matte film layer.

6. The large FOV optical display system according to claim 1, characterized in that: The first optical element includes a first optical lens, a second polarized reflective film, a third polarized reflective film, a second phase delay film and an anti-reflection film; The second polarizing reflective film is arranged on a side of the first optical lens close to the display unit, the third polarizing reflective film is arranged on a side of the first optical lens away from the display unit, the second phase delay film is arranged on a side of the third polarizing reflective film away from the first optical lens, and the number of anti-reflection films is two and they are respectively arranged on a side of the second polarizing reflective film away from the first optical lens and a side of the second phase delay film away from the first optical lens.

7. A wearable device, characterized in that: It comprises a wearable component and a large FOV optical display system as described in any one of claims 1 to 6, wherein the optical display system is arranged on the wearable component.

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