A large field of view ultra-thin near-eye display module and wearable device

Abstract

The utility model provides a kind of big field of view ultra-light and thin near-eye display module and wearable equipment, belong to optical imaging technical field, including display unit, first optical element, second optical element, third optical element and fourth 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, second optical element is prism structure, its upper surface is towards first optical element, third optical element is set on the front side of second optical element;Fourth optical element is set on the back side of second optical element, and there is polarized light splitting element between the front surface of fourth optical element and the rear surface of second optical element;The radius of curvature R21 of the upper surface of second optical element is greater than or equal to 50mm;The focal length of the near-eye display module is 10mm-14mm.Its structure is compact, 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 large field-of-view ultra-thin near-eye display module 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 (AR) 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 user experience and resulting in low user satisfaction. Utility Model Content

[0004] The purpose of this utility model is to provide a large field of view, ultra-thin and lightweight near-eye display module, which is small in size, thin in thickness, light in weight, low in stray light, low in distortion, good in imaging quality, and large in field of view, 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 large field-of-view ultra-thin near-eye display module, comprising a display unit, a first optical element, a second optical element, a third optical element, and a fourth 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 is a prism structure, with its upper surface facing the first optical element and its rear surface facing the human eye and 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 on the rear side of the second optical element. The fourth optical element is 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 fourth optical element and the rear surface of the second optical element.

[0012] The radius of curvature R11 of the surface of the first optical element closer to the display unit is ≤-100mm, and the radius of curvature R12 of the surface away from the display unit is ≥50mm;

[0013] The upper surface of the second optical element is a convex arc surface with a radius of curvature R21 ≥ 50 mm;

[0014] The focal length of this near-eye display module is 10mm-14mm.

[0015] Furthermore, the polarization beam splitter includes a first absorptive polarizing film and a first reflective polarizing film stacked sequentially from the second optical element toward the fourth optical element.

[0016] Furthermore, a first quarter-wave plate is provided on the front surface of the second optical element, or a second absorptive polarizing film, a second reflective polarizing film and a first quarter-wave plate are stacked in sequence.

[0017] Furthermore, the light-emitting side of the display unit is provided with a third absorptive polarizing film and / or a second quarter-wave plate.

[0018] Furthermore, the surface curvature radius R31 of the third optical element on the side closer to the second optical element is ≤-50mm, and the surface curvature radius R32 on the side farther from the second optical element is ≥200mm.

[0019] Furthermore, the first optical element has a refractive index of 1.6-1.8, an Abbe number of 15-70, a thickness of 1-3 mm, and a density of 1-1.5 g / cm³.

[0020] Furthermore, the third optical element has a refractive index of 1.6-1.8, an Abbe number of 15-70, a thickness of 2-4 mm, and a density of 1-1.5 g / cm³.

[0021] Furthermore, the second and fourth optical elements have a refractive index of 1.6-1.8, an Abbe number of 15-70, and a density of 1-1.5 g / cm³.

[0022] An embodiment of this utility model also provides a wearable device, including a wearable component and the aforementioned near-eye display module, wherein the near-eye display module is disposed on the wearable component.

[0023] The beneficial effects of this utility model are as follows:

[0024] The ultra-thin and lightweight near-eye display module with a large field of view provided by this utility model has a compact structure, small size, thin thickness, light weight, low stray lightness, low distortion, good imaging quality, and a large field of view, which can greatly improve the user experience.

[0025] 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

[0026] 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.

[0027] Figure 1 This is an architectural diagram of the large field-of-view ultra-thin near-eye display module in Embodiment 1;

[0028] Figure 2 This is a schematic diagram of another embodiment of the second optical element.

[0029] In the figure: 1-First optical element; 2-Second optical element; 21-First quarter-wave plate; 22-Second reflective polarizing film; 23-Second absorptive polarizing film; 3-Third optical element; 4-Fourth optical element; 5-Display unit; 51-Third absorptive polarizing film; 52-Second quarter-wave plate; 6-Polarization beam splitter; 61-First absorptive polarizing film; 62-First reflective polarizing 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 large field of view ultra-thin near-eye display module, including a display unit 5, a first optical element 1, a second optical element 2, a third optical element 3 and a fourth optical element 4.

[0035] The display unit 5 mainly functions to emit light. The display unit 5 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 light-emitting side of the display unit 5 is provided with a third absorptive polarizing film 51 or a second quarter-wave plate 52. Alternatively, the third absorptive polarizing film 51 and the second quarter-wave plate 52 can be stacked on the light-emitting side of the display unit 5.

[0037] 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 5. The number of first optical elements 1 can be one or a group of multiple lenses.

[0038] 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.

[0039] The surface curvature radius R11 of the first optical element 1 near the display unit 5 is ≤-100mm, and the surface curvature radius R12 of the side away from the display unit 5 is ≥50mm. The refractive index of the first optical element 1 is 1.6-1.8, the Abbe number is 15-70, the thickness is 1-3mm, and the density is 1-1.5g / cm³. In this embodiment, the refractive index of the first optical element 1 is 1.68, the Abbe number is 18.1, the thickness is 2mm, and the density is 1.2g / cm³.

[0040] 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. The rear surface refers to the side of the surface that faces the human eye when in use.

[0041] The upper surface of the second optical element 2 is a convex arc surface with a radius of curvature R21 ≥ 50 mm.

[0042] The second optical element 2 has a refractive index of 1.6-1.8, an Abbe number of 15-70, and a density of 1-1.5 g / cm³. In this embodiment, the second optical element 2 has a refractive index of 1.68, an Abbe number of 18.1, and a density of 1.2 g / cm³.

[0043] In one embodiment, a first quarter-wave plate 21 is provided on the front surface of the second optical element 2.

[0044] refer to Figure 2 As shown, in another embodiment, a second absorptive polarizing film 23, a second reflective polarizing film 22 and a first quarter-wave plate 21 may be stacked sequentially on the front surface of the second optical element 2, with the second absorptive polarizing film 23 attached to the front surface of the second optical element 2.

[0045] The third optical element 3 is disposed in front of the second optical element 2. The third optical element 3 is a reflector, and its function is to reflect the light that is transmitted from the front surface of the second optical element 2 and reaches the third optical element 3.

[0046] The surface curvature radius R31 of the third optical element 3 on the side closer to the second optical element 2 is ≤-50mm, and the surface curvature radius R32 on the side farther from the second optical element 2 is ≥200mm.

[0047] The third optical element 3 has a refractive index of 1.6-1.8, an Abbe number of 15-70, a thickness of 2-4 mm, and a density of 1-1.5 g / cm³. In this embodiment, the third optical element 3 has a refractive index of 1.68, an Abbe number of 18.1, a thickness of 3 mm, and a density of 1.2 g / cm³.

[0048] The fourth optical element is disposed on the rear side of the second optical element 2. The fourth optical element is a prism structure, specifically 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 fourth optical element corresponds to the rear surface of the second optical element 2.

[0049] The fourth optical element 4 has a refractive index of 1.6-1.8, an Abbe number of 15-70, and a density of 1-1.5 g / cm³. In this embodiment, the fourth optical element 4 has a refractive index of 1.68, an Abbe number of 18.1, and a density of 1.2 g / cm³.

[0050] A polarization beam splitter 6 is also provided between the front surface of the fourth optical element and the rear surface of the second optical element 2. The function of the polarization beam splitter 6 is to split transmitted and reflected light, control phase, and absorb stray light.

[0051] refer to Figure 1 As shown, the polarization beam splitter 6 includes a first absorptive polarizing film 61 and a first reflective polarizing film 62 stacked together. The first absorptive polarizing film 61 is attached to the rear surface of the second optical element 2, and the first reflective polarizing film 62 is attached to the front surface of the fourth optical element 4.

[0052] The focal length of the near-eye display module can be 10mm-14mm. In this embodiment, the focal length of the near-eye display module is 12mm.

[0053] It should be noted that the dashed arrows in the figure represent the propagation path of the imaging light rays.

[0054] The imaging principle of the near-eye display module provided in this embodiment is as follows:

[0055] The light emitted from display unit 5 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 6, 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 the second optical element 2 again to its front surface, and is then transmitted out to the third optical element 3. The light is reflected a 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 reaches the front surface of the second optical element 2 and enters the interior of the second optical element 2. Inside the second optical element 2, it propagates to its rear surface and is transmitted out from the rear surface of the second optical element 2 into the polarizing beam splitter 6. It is transmitted out from the polarizing beam splitter 6 and enters the interior of the fourth optical element 4 from the front surface. The light propagates inside the fourth optical element 4 toward its rear surface and is then transmitted out from the rear surface of the fourth optical element 4 to reach the human eye, forming a virtual image with a specific magnification. Example 2

[0056] Embodiment 2 of this utility model also provides a wearable device, including a wearable component and a near-eye display module.

[0057] It should be noted that the near-eye display module in this embodiment can be the near-eye display module in Embodiment 1. Its structure, working principle and technical effects are the same as those in Embodiment 1, and will not be repeated here.

[0058] The near-eye display module is mounted on a 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.

[0059] 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.

[0060] 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 large field of view ultra-thin near-eye display module, characterized in that: It includes a display unit, a first optical element, a second optical element, a third optical element, and a fourth 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 is a prism structure, with its upper surface facing the first optical element and its rear surface facing the human eye and 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 on the rear side of the second optical element. The fourth optical element is 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 fourth optical element and the rear surface of the second optical element. The radius of curvature R11 of the surface of the first optical element closer to the display unit is ≤-100mm, and the radius of curvature R12 of the surface away from the display unit is ≥50mm; The upper surface of the second optical element is a convex arc surface with a radius of curvature R21 ≥ 50 mm; The focal length of this near-eye display module is 10mm-14mm.

2. The large field of view ultra-light and thin near-eye display module according to claim 1, characterized in that: The polarization beam splitter includes a first absorptive polarizing film and a first reflective polarizing film stacked sequentially from the second optical element toward the fourth optical element. 3.The large field of view ultra-thin near-eye display module according to claim 1, characterized in that: The front surface of the second optical element is provided with a first quarter-wave plate, or a second absorptive polarizing film, a second reflective polarizing film and a first quarter-wave plate are stacked in sequence. 4.The large field of view ultra-thin near-eye display module of claim 1, wherein: The light-emitting side of the display unit is provided with a third absorptive polarizing film and / or a second quarter-wave plate. 5.The large field of view ultra-thin near-eye display module according to claim 1, characterized in that: The radius of curvature R31 of the surface of the third optical element closer to the second optical element is ≤-50mm, and the radius of curvature R32 of the surface of the surface farther from the second optical element is ≥200mm. 6.The large field of view ultra-thin near-eye display module according to claim 1, wherein: The first optical element has a refractive index of 1.6-1.8, an Abbe number of 15-70, a thickness of 1-3 mm, and a density of 1-1.5 g / cm³. 7.The large field of view ultra-thin near-eye display module according to claim 1, wherein: The third optical element has a refractive index of 1.6-1.8, an Abbe number of 15-70, a thickness of 2-4 mm, and a density of 1-1.5 g / cm³. 8.The large field of view ultra-thin near-eye display module according to claim 1, wherein: The second and fourth optical elements have a refractive index of 1.6-1.8, an Abbe number of 15-70, and a density of 1-1.5 g / cm³.

9. A wearable device, characterized by: It includes a wearable component and a near-eye display module as described in any one of claims 1-8, wherein the near-eye display module is disposed on the wearable component.

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