A thin and light multiple-fold optical display system and wearable device

Abstract

The utility model provides a kind of multiple folding optical display system and wearable equipment of thinning and lightening belong to optical imaging technical field, including display unit, first optical element, second optical element, third optical element, fourth optical element and fifth optical element;First optical element is set on the light path of display unit;Second optical element is set on the transmission light path of first optical element, third optical element is set on the front side of second optical element;Fourth optical element is set on the front side of third optical element, and the front surface of fourth optical element is Fresnel surface;Fifth optical element is set on the back side of second optical element, and there is polarized light splitting element between the front surface of fifth optical element and the back surface of second optical element.It is compact in structure, small in size, thin in thickness, light in weight, low in stray, good in imaging quality, large in field of view angle, greatly improves the experience of user.

Description

Technical Field

[0001] This utility model belongs to the field of optical imaging technology, specifically relating to a thinner and lighter multi-fold optical display system and wearable device. Background Technology

[0002] Augmented reality (AR) optical display technology is a technology that can project and magnify display images. This technology not only expands upon traditional display technologies but also introduces entirely new experiences: merging the real and virtual worlds, making life more convenient and enriching entertainment. It is currently widely used in education, healthcare, aerospace, and many other fields.

[0003] As augmented reality display technology continues to develop and its application areas expand, the requirements for display devices are also increasing. Current AR modules generally suffer from issues such as thickness and weight, significantly impacting the user experience. Utility Model Content

[0004] The purpose of this invention is to provide a thinner and lighter multi-fold optical display system that is small in size, thin, light in weight, has low stray lightness, low distortion, good image quality, and a wide field of view, thus greatly improving the user experience.

[0005] Another objective of this invention is to provide a wearable device that is lightweight and easy to wear.

[0006] The embodiments of this utility model are implemented as follows:

[0007] The present invention provides a thinner and lighter multi-fold optical display system, including a display unit, a first optical element, a second optical element, a third optical element, a fourth optical element and a fifth optical element;

[0008] The first optical element is disposed in the light-emitting path of the display unit;

[0009] The second optical element is disposed on the transmitted light path of the first optical element. The second optical element has a prism structure, with its upper surface facing the first optical element and its rear surface being an inclined surface that slopes from top to bottom and forward.

[0010] The third optical element is disposed in front of the second optical element;

[0011] The fourth optical element is disposed in front of the third optical element, and the front surface of the fourth optical element is a Fresnel surface;

[0012] The fifth optical element is disposed on the rear side of the second optical element. The fifth optical element has a prism structure, and its front surface is an inclined surface that slopes from top to bottom and corresponds to the rear surface of the second optical element. A polarization beam splitter is provided between the front surface of the fifth optical element and the rear surface of the second optical element.

[0013] Furthermore, the polarization beam splitter includes a phase retardation film, a reflection film, and an absorption film stacked sequentially, with the phase retardation film close to the second optical element.

[0014] Furthermore, the rear surface of the third optical element is provided with an antireflection film, and the front surface is provided with a partially transmissive and partially reflective film or a total reflective film.

[0015] Furthermore, the Fresnel surface includes a first optical surface and a second optical surface. The first optical surface faces the axial direction of the fourth optical element, and the second optical surface faces the radial direction of the fourth optical element. An anti-reflection coating is provided on the first optical surface, and an anti-glare coating layer is provided on the second optical surface.

[0016] Furthermore, the matte film layer is made by any one or more of the following methods: ink coating, light-absorbing film plating, or light-absorbing film attachment.

[0017] Furthermore, an anti-reflective coating is provided on the rear surface of the fourth optical element.

[0018] Furthermore, the first optical element is a transmission mirror.

[0019] Furthermore, the upper surface, front surface, and rear surface of the second optical element are any one of the following surface types: plane, sphere, aspherical, freeform surface, or Fresnel surface.

[0020] Furthermore, the lower surface, front surface, and rear surface of the fifth optical element can be any one of the following surface types: plane, sphere, aspherical, freeform surface, or Fresnel surface.

[0021] An embodiment of this utility model also provides a wearable device, including a wearable component and the aforementioned optical display system, wherein the optical display system is disposed on the wearable component.

[0022] The beneficial effects of this utility model are as follows:

[0023] The thinning and lightening multi-fold optical display system provided by this utility model has a compact structure, small size, thinness, light weight, low stray lightness, low distortion, good imaging quality, and large field of view, which greatly improves the user experience.

[0024] The wearable device provided by this utility model has a simple manufacturing process, low cost, light weight, and is easy to wear, greatly improving the user's wearing experience. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 This is an architectural diagram of the thinning and lightening multi-fold optical display system of Embodiment 1;

[0027] Figure 2 This is a schematic diagram of the fourth optical element;

[0028] Figure 3 This is a schematic diagram of a polarization beam splitter.

[0029] In the figure: 1-First optical element; 2-Second optical element; 3-Third optical element; 4-Fourth optical element; 41-First optical surface; 42-Second optical surface; 5-Fifth optical element; 6-Display unit; 7-Polarization beam splitter; 71-Phase retardation film; 72-Reflective film; 73-Absorption film. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and shown in the accompanying drawings can typically be arranged and designed in various different configurations.

[0031] 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 to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0032] It should be noted that, where there is no conflict, the embodiments and features in the embodiments of this utility model can be combined with each other.

[0033] In the description of this utility model, it should be noted that the terms "upper," "lower," "front," "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of this utility model is in use, or the orientation or positional relationship commonly understood by those skilled in the art. They are only used for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance. Example 1

[0034] refer to Figure 1 As shown, Embodiment 1 of this utility model provides a thinner and lighter multi-fold optical display system, including a display unit 6, a first optical element 1, a second optical element 2, a third optical element 3, a fourth optical element 4, and a fifth optical element 5.

[0035] The display unit 6 mainly functions to emit light. The display unit 6 can display 2D or 3D images or videos, and can be an OLED display, LCD display, LCOS display, micro-LED display, or mini-LED display.

[0036] The first optical element 1 is a transmission mirror. The first optical element 1 is disposed in the light output path of the display unit 6. The number of first optical elements 1 can be one or a group of multiple lenses.

[0037] The first optical element 1 is used to control light, improve image quality parameters such as image distortion and resolution, and reduce the module size.

[0038] The two optical surfaces of the first optical element 1 can be processed into planar, spherical, aspherical, or freeform surfaces.

[0039] The second optical element 2 is disposed on the transmitted light path of the first optical element 1. The second optical element 2 is a prism structure, which is a triangular prism structure in this embodiment. Its upper surface faces the first optical element 1, and its rear surface is an inclined surface that slopes from top to bottom and forward.

[0040] The upper, front, and rear surfaces of the second optical element 2 can be processed into planar, spherical, aspherical, freeform, or Fresnel surfaces.

[0041] The third optical element 3 is disposed in front of the second optical element 2. An anti-reflection film is provided on the rear surface of the third optical element 3, and a partially transmissive and partially reflective film or a total reflection film is provided on the front surface of the third optical element 3. Its function is to reflect the light that will be transmitted from the front surface of the second optical element 2 and reach the third optical element 3.

[0042] The fourth optical element 4 is disposed in front of the third optical element 3. An anti-reflective coating is provided on the rear surface of the fourth optical element 4. The front surface of the fourth optical element 4 is a Fresnel surface. The function of the Fresnel surface here is to reduce the weight of the optical lens and also to compensate for the optical path difference, so that the user can see a normal image of the outside world.

[0043] refer to Figure 2 As shown, the Fresnel surface of the fourth optical element 4 includes a first optical surface 41 and a second optical surface 42. The first optical surface 41 faces the axial direction of the fourth optical element 4, and the second optical surface 42 faces the radial direction of the fourth optical element 4. An anti-reflection coating is provided on the first optical surface 41, and an anti-glare coating layer is provided on the second optical surface 42.

[0044] The matte coating layer can be made by any of the following methods: ink coating, light-absorbing film deposition, or light-absorbing film attachment, or a combination of these methods. The function of the matte coating layer is to reduce or eliminate unwanted stray light from the outside world.

[0045] The fifth optical element is disposed on the rear side of the second optical element 2. The fifth optical element is a prism structure, which is a triangular prism structure in this embodiment. Its front surface is an inclined surface that slopes from top to bottom and forward. The front surface of the fifth optical element corresponds to the rear surface of the second optical element 2. A polarization beam splitting element 7 is also provided between the front surface of the fifth optical element and the rear surface of the second optical element 2.

[0046] The function of polarization beam splitter 7 is to perform transmission and reflection beam splitting, phase control, and stray light absorption.

[0047] refer to Figure 3 As shown, the polarization beam splitter 7 includes a phase retardation film 71, a reflection film 72 and an absorption film 73 stacked in sequence. The phase retardation film 71 is attached to the rear surface of the second optical element 2, and the absorption film 73 is attached to the front surface of the fifth optical element 5.

[0048] The lower, front, and rear surfaces of the fifth optical element can be machined into planar, spherical, aspherical, freeform, or Fresnel surfaces.

[0049] It should be noted that the dashed arrows in the figure represent the propagation path of the imaging light rays.

[0050] The imaging principle of the optical display system provided in this embodiment is as follows:

[0051] The light emitted from display unit 6 is processed by the first optical element 1 and then transmitted out. The light transmitted from the first optical element 1 enters the interior of the second optical element 2 from its upper surface, then propagates inside and reaches its front surface where it is reflected for the first time. The first reflected light propagates inside the second optical element 2 to its rear surface and is transmitted out to the polarizing beam splitter 7, where it is reflected a second time. The second reflected light then enters the interior of the second optical element 2 from its rear surface, propagates inside, reaches its front surface again, and is then transmitted out to the third optical element 3. The light is reflected for the third time at the front surface of the third optical element 3, propagates inside it to its rear surface, and is transmitted out from the rear surface of the third optical element 3. Then it enters the interior of the second optical element 2 from the front surface, propagates inside the second optical element 2 to its rear surface, and is transmitted out from the rear surface of the second optical element 2 into the polarizing beam splitter 7. It is transmitted out from the polarizing beam splitter 7 and enters the interior of the fifth optical element 5 from the front surface. The light propagates inside the fifth optical element 5 toward its rear surface, and is transmitted out from the rear surface of the fifth optical element 5 to reach the human eye, forming a virtual image with a specific magnification. Example 2

[0052] Embodiment 2 of the present invention also provides a wearable device, including wearable components and an optical display system.

[0053] It should be noted that the optical path system in this embodiment can adopt the optical display system in Embodiment 1. Its structure, working principle and technical effects are the same as those in Embodiment 1, and will not be repeated here.

[0054] The optical display system is mounted on the wearable component. This component can be a helmet or eyeglass frame, making it convenient for people to wear on their heads. Wearable devices also include a control unit and a storage unit; the control unit controls the device, and the storage unit stores images, videos, etc.

[0055] It should be noted that this application does not limit the optical display system to wearable devices. The optical display system can also be used on other devices. In one possible application scenario, it can also be integrated into desktop optical display devices and automotive optical display devices. Its virtual image distance is relatively far, which can realize eye protection function and improve the viewing experience.

[0056] This utility model is not limited to the optional embodiments described above, and anyone can derive other various forms of products under the guidance of this utility model. The specific embodiments described above should not be construed as limiting the scope of protection of this utility model. The scope of protection of this utility model shall be determined by the claims, and the description can be used to interpret the claims.

Claims

1. A thinner and lighter multi-fold optical display system, characterized in that: It includes a display unit, a first optical element, a second optical element, a third optical element, a fourth optical element, and a fifth optical element; The first optical element is disposed in the light-emitting path of the display unit; The second optical element is disposed on the transmitted light path of the first optical element. The second optical element has a prism structure, with its upper surface facing the first optical element and its rear surface being an inclined surface that slopes from top to bottom and forward. The third optical element is disposed in front of the second optical element; The fourth optical element is disposed in front of the third optical element, and the front surface of the fourth optical element is a Fresnel surface; The fifth optical element is disposed on the rear side of the second optical element. The fifth optical element has a prism structure, and its front surface is an inclined surface that slopes from top to bottom and corresponds to the rear surface of the second optical element. A polarization beam splitter is provided between the front surface of the fifth optical element and the rear surface of the second optical element.

2. The thinning and weight-reducing multi-fold optical display system according to claim 1, characterized in that: The polarization beam splitter includes a phase retardation film, a reflection film, and an absorption film stacked sequentially, with the phase retardation film close to the second optical element.

3. The thinning and weight-reducing multi-fold optical display system according to claim 1, characterized in that: The rear surface of the third optical element is provided with an anti-reflection film, and the front surface is provided with a partially transmissive and partially reflective film or a total reflective film.

4. The thinning and weight-reducing multi-fold optical display system according to claim 1, characterized in that: The Fresnel surface includes a first optical surface and a second optical surface. The first optical surface faces the axial direction of the fourth optical element, and the second optical surface faces the radial direction of the fourth optical element. An anti-reflection coating is provided on the first optical surface, and an anti-reflection coating layer is provided on the second optical surface.

5. The thinning and lightweight multi-fold optical display system according to claim 4, characterized in that: The matte film layer is made by any one or more of the following methods: ink coating, light-absorbing film plating, or light-absorbing film attachment.

6. The thinning and lightweight multi-fold optical display system according to claim 1, characterized in that: An anti-reflection coating is provided on the rear surface of the fourth optical element.

7. The thinning and lightweight multi-fold optical display system according to claim 1, characterized in that: The first optical element is a transmission mirror.

8. The thinning and lightweight multi-fold optical display system according to claim 1, characterized in that: The upper, front, and rear surfaces of the second optical element are any one of the following surface types: plane, sphere, aspherical, freeform, or Fresnel surface.

9. The thinning and lightweight multi-fold optical display system according to claim 1, characterized in that: The lower, front, and rear surfaces of the fifth optical element are any one of the following surface types: plane, sphere, aspherical, freeform, or Fresnel surface.

10. A wearable device, characterized in that: The device includes a wearable component and a thinned and lightweight multi-fold optical display system as described in any one of claims 1-9, the optical display system being disposed on the wearable component.

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