Optical system for improving optical display performance and wearable device

Abstract

The utility model provides an optical system for improving optical display performance and wearable equipment, which belong to the technical field of optical imaging and comprise a display unit, a transmitting mirror, a prism and a reflecting mirror. The transmitting mirror is arranged on an emergent light path of the display unit, the prism is arranged on a transmitted light path of the transmitting mirror, the front surface of the prism is an inclined plane which is inclined downwards from back to front and faces the transmitting mirror, and the rear surface of the prism faces human eyes. An absorption film, a polarization reflection film and a phase delay film are sequentially arranged on the front surface of the prism, and the reflector is arranged on the side, away from human eyes, of the 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 an optical system and a wearable device for improving 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 an optical system for improving optical display performance, which has 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 head mounted display device which 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 an optical system for improving optical display performance, including a display unit, a transmission mirror, a prism and a reflection mirror;

[0008] The transmission mirror is arranged on the light output path of the display unit, the prism is arranged on the transmitted light path of the transmission mirror, the front surface of the prism is an inclined surface obliquely downward from the back to the front and facing the transmission mirror, the rear surface of the prism faces the human eye, and an absorption film, a polarization reflection film and a phase delay film are arranged in sequence on the front surface of the prism, and the reflector is arranged on the side of the prism away from the human eye.

[0009] Optionally, an angle formed by an optical axis of the light transmitted from the transmission mirror and the front surface of the prism is 20° to 70°.

[0010] Optionally, a surface of the reflector on one side close to the prism is a concave surface with a curvature radius of R1, |R1|<100mm.

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

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

[0013] An embodiment of the utility model further provides a wearable device, comprising a wearable component and the above-mentioned optical system for improving optical display performance, wherein the optical system is arranged on the wearable component.

[0014] The beneficial effects of the utility model are:

[0015] The optical system for improving 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.

[0016] 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

[0017] 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.

[0018] Figure 1 This is a schematic diagram of an optical system for improving optical display performance according to Embodiment 1;

[0019] In the figure: 1-display unit; 2-transmission mirror; 3-prism; 31-absorption film; 32-polarization reflection film; 33-phase delay film; 4-reflection 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] 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.

[0022] 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.

[0023] 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

[0024] refer to Figure 1 As shown, the first embodiment of the utility model provides an optical system for improving optical display performance, including a display unit 1, a transmission mirror 2, a prism 3 and a reflection mirror 4.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] The 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 prism 3 is arranged on the transmission light path of the transmission mirror 2. The front surface of the prism 3 is an inclined surface that is inclined downward from the back to the front and faces the transmission mirror 2. The rear surface of the prism 3 faces the human eye, and the lower surface of the prism 3 faces downward.

[0029] The front surface of the prism 3 is provided with an absorption film 31, a polarization reflection film 32 and a phase delay film 33 in sequence. The phase delay film 33 is used to change the polarization characteristics of light, the polarization reflection film 32 is used to reflect light of a certain normal state, and the absorption film 31 is used to absorb external stray light.

[0030] A light-absorbing film layer may be provided on the lower surface of the prism 3 , and the light-absorbing film layer may be formed by ink coating, light-absorbing film plating, or light-absorbing film sheet pasted.

[0031] The lower surface, front surface and rear surface of the prism 3 are spherical, aspherical, free-form or Fresnel surfaces, and are processed as required.

[0032] The reflector 4 is arranged on the side of the prism 3 away from the human eye. The reflector 4 is used to reflect the imaging light and also allows the user to observe the external environment.

[0033] The surface of the reflector 4 on one side close to the prism 3 is a concave surface with a curvature radius of R1, where |R1|<100 mm.

[0034] The light transmitted from the transmission mirror 2 passes through the phase delay film 33 and reaches the polarization reflection film 32 to be reflected for the first time. The light reflected for the first time propagates into the reflection mirror 4 and is reflected for the second time. The light reflected for the second time passes through the phase delay film 33, the polarization reflection film 32 and the absorption film 31 in sequence and then enters the prism 3 from the front surface of the prism 3. Finally, it is transmitted from the rear surface of the prism 3 to reach the human eye, forming a virtual image with a specific magnification factor.

[0035] In this embodiment, the angle formed by the optical axis of the light transmitted from the transmission mirror 2 and the front surface of the prism 3 is 20° to 70°. In this embodiment, 30° is preferred. Embodiment 2

[0036] Embodiment 2 of the present invention provides a wearable device, including a wearable component and an optical system.

[0037] It should be noted that the optical system in this embodiment can adopt the optical 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.

[0038] The optical system is arranged 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.

[0039] It should be noted that the present application does not limit the application of the optical 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.

[0040] 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. An optical system for improving optical display performance, characterized in that: It includes a display unit, a transmission mirror, a prism and a reflection mirror; The transmission mirror is arranged on the light output path of the display unit, the prism is arranged on the transmitted light path of the transmission mirror, the front surface of the prism is an inclined surface obliquely downward from the back to the front and facing the transmission mirror, the rear surface of the prism faces the human eye, and an absorption film, a polarization reflection film and a phase delay film are arranged in sequence on the front surface of the prism, and the reflector is arranged on the side of the prism away from the human eye.

2. The optical system for improving optical display performance according to claim 1, characterized in that: The angle formed by the optical axis of the light transmitted from the transmission mirror and the front surface of the prism is 20° to 70°.

3. The optical system for improving optical display performance according to claim 1, characterized in that: The surface of one side of the reflector close to the prism is a concave surface, and the radius of curvature is R1, |R1|<100mm.

4. The optical system for improving optical display performance according to claim 1, characterized in that: A light absorbing film layer is provided on the lower surface of the prism.

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

6. A wearable device, characterized in that: It comprises a wearable component and an optical system for improving optical display performance as described in any one of claims 1 to 5, wherein the optical system is arranged on the wearable component.

Images