Display system for improving AR optical display performance and wearable device

Abstract

The utility model provides a display system for improving AR optical display performance and a wearable device, which belong to the technical field of optical imaging and comprise a display unit, a transmitting mirror, a first prism and a second prism. The transmitting mirror is arranged on an emergent light path of the display unit, the first prism is arranged on a transmitting light path of the transmitting mirror, the rear surface of the first prism faces one side of human eyes, the upper surface of the first prism faces the transmitting mirror, the rear surface of the first prism is an inclined plane which is inclined downwards from back to front, and the second prism is arranged on the rear side of the first prism. The front surface of the second prism is an inclined plane which is inclined downwards from back to front and corresponds to the rear surface of the first prism, the rear surface of the second prism faces human eyes, a polarization reflection film and a phase delay film are arranged between the first prism and the second prism, and the polarization reflection film is attached to the rear surface of the first prism. The optical system is compact in structure, small in size, light in weight, thin in thickness, 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 specifically relates to a display system and a wearable device for improving AR optical display performance. Background Art

[0002] Enhanced display optical display technology is a technology that can project and magnify the display image. This technology can not only expand the traditional display technology, but also introduce a new experience: integrating the real world with the virtual world, making people's lives more convenient and enriching their entertainment. It has been widely used in education, medical care, aerospace and other fields.

[0003] In the rapid development of augmented reality optical display technology, many different technical solutions have been derived, including Birdbath, array optical waveguide, diffraction optical waveguide, etc. However, these existing technologies are still thick, heavy, and have image stray problems, which have a great impact on user experience of the product. Utility Model Content

[0004] The purpose of the embodiments of the utility model is to provide a display system for improving AR optical display performance, which has a small size, light weight, thin thickness, low stray light, good imaging quality, and a large field of view, thereby greatly improving the user experience.

[0005] Another object of the embodiments of the present invention is to provide a wearable device that is light in weight and easy to wear.

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

[0007] The embodiment of the utility model provides a display system for improving AR optical display performance, including a display unit, a transmission mirror, a first prism and a second prism.

[0008] The transmission mirror is arranged on the light-emitting path of the display unit, the first prism is arranged on the light-transmitting path of the transmission mirror, the rear surface of the first prism faces the side of the human eye, the upper surface of the first prism faces the transmission mirror, the rear surface of the first prism is an inclined surface inclined downward from the back to the front, the second prism is arranged on the rear side of the first prism, the front surface of the second prism is an inclined surface inclined downward from the back to the front and corresponds to the rear surface of the first prism, the rear surface of the second prism faces the human eye, a polarization reflection film and a phase delay film are arranged between the first prism and the second prism, and the polarization reflection film is attached to the rear surface of the first prism;

[0009] The light transmitted from the transmission mirror is incident on the upper surface of the first prism and enters the first prism, then propagates to the rear surface of the first prism and passes through the polarizing reflection film and the phase delay film in sequence, then enters the second prism from the front surface of the second prism, then propagates to the lower surface of the second prism and is reflected for the first time. The light reflected for the first time propagates toward the front surface of the second prism and is reflected for the second time when reaching the polarizing reflection film. The light reflected for the second time propagates toward the rear surface of the second prism and is transmitted out to reach the human eye.

[0010] Optionally, the lower surface of the second prism is a curved surface, and the radius of curvature of the lower surface of the second prism is R, where |R|<100.

[0011] Optionally, the angle between the upper surface and the rear surface of the first prism is 20° to 70°.

[0012] Optionally, the upper surface, the front surface and the rear surface of the first prism are spherical surfaces, aspherical surfaces, free-form surfaces or Fresnel surfaces.

[0013] Optionally, the front surface and the rear surface of the second prism are spherical, aspherical, free-form or Fresnel surfaces.

[0014] Optionally, the polarizing reflective film is closely attached to the rear surface of the first prism, the phase delay film is closely attached to the polarizing reflective film, and the front surface of the second prism is closely attached to the phase delay film.

[0015] An embodiment of the present utility model further provides a wearable device, comprising a wearable component and the above-mentioned display system for improving AR optical display performance, wherein the display system is arranged on the wearable component.

[0016] The beneficial effects of the utility model are:

[0017] The display system for improving AR optical display performance provided by the embodiment of the utility model has a compact structure, small size, light weight, thin thickness, low stray light, good imaging quality, and a large field of view, which greatly improves the user experience.

[0018] The wearable device provided by the embodiment of the utility model has a simple production process, low cost, light weight, and is easy to wear, which greatly improves the wearing experience of the user. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments are briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 This is an architecture diagram of a display system for improving AR optical display performance according to Embodiment 1;

[0021] In the figure: 1-display unit; 2-transmission mirror; 3-first prism; 31-polarization reflection film; 32-phase delay film; 4-second prism. DETAILED DESCRIPTION

[0022] 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.

[0023] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention.

[0024] 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.

[0025] In the description of the present utility model, it should be noted that the terms "front", "rear", "upper", "lower", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the utility model product is usually placed when in use, or are directions or positional relationships commonly understood by those skilled in the art. These are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present utility model. Embodiment 1

[0026] refer to Figure 1As shown, the first embodiment of the utility model provides a display system for improving AR optical display performance, including a display unit 1, a transmission mirror 2, a first prism 3 and a second prism 4.

[0027] 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.

[0028] The transmission mirror 2 is arranged on the light path of the display unit 1. The 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 transmission mirror 2 can be one or more.

[0029] The material of the transmission mirror 2 can be plastic or glass. The two side surfaces of the transmission mirror 2 can be processed into spherical surface, aspherical surface, free-form surface or Fresnel surface.

[0030] The first prism 3 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, its interior is filled with optical liquid or gas. The first prism 3 is arranged on the transmission light path of the transmission mirror 2, the upper surface of the first prism 3 faces the transmission mirror 2, the rear surface of the first prism 3 faces the human eye, and the rear surface of the first prism 3 is an inclined surface that is inclined downward from the back to the front.

[0031] The included angle between the upper surface and the rear surface of the first prism 3 is 20° to 70°.

[0032] The upper surface, the front surface and the rear surface of the first prism 3 are spherical surfaces, aspherical surfaces, free-form surfaces or Fresnel surfaces, and are processed as required.

[0033] The second prism 4 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 4 is arranged on the rear side of the first prism 3, and the front surface of the second prism 4 is an inclined surface that is inclined downward from the back to the front; the front surface of the second prism 4 corresponds to the rear surface of the first prism 3, and the rear surface of the second prism 4 faces the human eye. The lower surface of the second prism 4 is a curved surface, and the radius of curvature is R, |R|<100.

[0034] The front surface and the rear surface of the second prism 4 are spherical, aspherical, free-form or Fresnel surfaces.

[0035] A polarizing reflective film 31 and a phase delay film 32 are provided between the first prism 3 and the second prism 4. The polarizing reflective film is closely attached to the rear surface of the first prism 3, the phase delay film 32 is closely attached to the polarizing reflective film 31, and the front surface of the second prism 4 is closely attached to the phase delay film 32. The phase delay film 32 is used to change the polarization characteristics of light, and the polarizing reflective film 31 is used to reflect light of a certain polarization state.

[0036] The light transmitted from the transmission mirror 2 is incident on the first prism 3 from the upper surface of the first prism 3, then propagates to the rear surface of the first prism 3 and passes through the polarizing reflection film and the phase delay film in sequence, and then enters the second prism 4 from the front surface of the second prism 4, and then propagates to the lower surface of the second prism 4 and is reflected for the first time. The light reflected for the first time propagates toward the front surface of the second prism 4 and is reflected for the second time when reaching the polarizing reflection film 31. The light reflected for the second time propagates toward the rear surface of the second prism 4 and is transmitted out to reach the human eye.

[0037] Embodiment 2

[0038] A second embodiment of the present invention provides a wearable device, including a wearable component and a display system.

[0039] It should be noted that the display system in this embodiment can adopt the display system in Example 1. Its structure, working principle and technical effects produced refer to the corresponding contents in Example 1 and are not elaborated here.

[0040] The 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.

[0041] It should be noted that the present application does not limit the application of the 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.

[0042] 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 display system for improving AR optical display performance, characterized in that: It includes a display unit, a transmission mirror, a first prism and a second prism; The transmission mirror is arranged on the light-emitting path of the display unit, the first prism is arranged on the light-transmitting path of the transmission mirror, the rear surface of the first prism faces the side of the human eye, the upper surface of the first prism faces the transmission mirror, the rear surface of the first prism is an inclined surface inclined downward from the back to the front, the second prism is arranged on the rear side of the first prism, the front surface of the second prism is an inclined surface inclined downward from the back to the front and corresponds to the rear surface of the first prism, the rear surface of the second prism faces the human eye, a polarization reflection film and a phase delay film are arranged between the first prism and the second prism, and the polarization reflection film is attached to the rear surface of the first prism; The light transmitted from the transmission mirror is incident on the upper surface of the first prism and enters the first prism, then propagates to the rear surface of the first prism and passes through the polarizing reflection film and the phase delay film in sequence, then enters the second prism from the front surface of the second prism, then propagates to the lower surface of the second prism and is reflected for the first time. The light reflected for the first time propagates toward the front surface of the second prism and is reflected for the second time when reaching the polarizing reflection film. The light reflected for the second time propagates toward the rear surface of the second prism and is transmitted out to reach the human eye.

2. The display system for improving AR optical display performance according to claim 1, characterized in that: The lower surface of the second prism is a curved surface, and the curvature radius of the lower surface of the second prism is R, where |R|<100.

3. The display system for improving AR optical display performance according to claim 1, characterized in that: The angle between the upper surface and the rear surface of the first prism is 20° to 70°.

4. The display system for improving AR optical display performance according to claim 1, characterized in that: The upper surface, the front surface and the rear surface of the first prism are spherical surfaces, aspherical surfaces, free-form surfaces or Fresnel surfaces.

5. The display system for improving AR optical display performance according to claim 1, characterized in that: The front surface and the rear surface of the second prism are spherical, aspherical, free-form or Fresnel surfaces.

6. The display system for improving AR optical display performance according to claim 1, characterized in that: The polarizing reflective film is closely attached to the rear surface of the first prism, the phase delay film is closely attached to the polarizing reflective film, and the front surface of the second prism is closely attached to the phase delay film.

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

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