Optical display system and VR device

Abstract

The utility model discloses an optical display system and VR equipment. The optical display system comprises a receiving end, a first lens, a second lens and a display, the first lens and the second lens are sequentially arranged between the receiving end and the display along the direction from the receiving end to the display; a protective film is arranged on one surface, close to the receiving end, of the first lens; a reflective polarizing film is arranged between the first lens and the protective film; a first phase retarder is arranged on one surface, close to the receiving end, of the second lens; a semi-transparent and semi-reflective film is arranged on one surface, far away from the receiving end, of the second lens; a second phase delay piece is arranged on the face, close to the second lens, of the display, and a linear polaroid is arranged between the second lens and the second phase delay piece. Compared with the prior art, through the arrangement of the first lens and the second lens, the size and the weight of the optical display system can be effectively reduced, the aberration of the system is effectively corrected, the distortion is reduced, the imaging quality is improved, the weight and the size of VR equipment are further reduced, and the use experience of the VR equipment is improved.

Description

Technical Field

[0001] This utility model relates to the field of optical technology, and in particular to an optical display system and VR device. Background Technology

[0002] With the development of optical technology, users have increasingly higher requirements for VR devices. In the design process of existing VR devices, it is necessary to improve the field of view while maintaining high resolution. However, increasing the field of view will introduce aberrations and increase the distortion of the optical display system. In current technology, the image quality problem is usually solved by increasing the number of lenses. However, increasing the number of lenses will increase the complexity of the optical display system, increase the size and weight of the optical display system, and thus affect the wearing experience of the VR device.

[0003] Therefore, it is necessary to provide an optical display system and a VR device to solve the above problems. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the present invention provides an optical display system and a VR device, which can improve the imaging quality of the optical system while reducing the weight and volume of the optical system, thereby improving the user experience.

[0005] To achieve the above objectives, a first aspect of this utility model provides an optical display system, comprising a receiver, a first lens, a second lens, and a display; the first lens and the second lens are sequentially disposed between the receiver and the display along the direction from the receiver to the display; a protective film is disposed on the side of the first lens near the receiver, and a reflective polarizing film is disposed between the first lens and the protective film; a first phase retardation film is disposed on the side of the second lens near the receiver; a semi-transparent and semi-reflective film is disposed on the side of the second lens away from the receiver; a second phase retardation film is disposed on the side of the display near the second lens, and a linear polarizer is disposed between the second lens and the second phase retardation film.

[0006] In a preferred embodiment, the effective focal lengths of the first lens, the second lens, and the optical display system are F1, F2, and F, respectively, where F1 is a positive value and F2 is a negative value, and satisfy: 2.13≤F1 / F≤2.80, -23.49≤F2 / F≤-16.70.

[0007] In a preferred embodiment, the refractive indices of the first lens and the second lens on line D are N1 and N2, respectively, and satisfy: 1.514≤N1≤1.525, 1.640≤N2≤1.690.

[0008] In a preferred embodiment, the Abbe numbers of the first lens and the second lens on line D are V1 and V2, respectively, and satisfy: 52.5≤V1≤63.0, 20.4≤V2≤32.6.

[0009] In a preferred embodiment, the distance between the side of the first lens away from the receiving end and the side of the second lens close to the receiving end is D2, and D2 is adjustable, satisfying: 0.227mm≤D2≤0.886mm.

[0010] In a preferred embodiment, the distance between the side of the first lens away from the receiver and the display is D, the distance between the side of the first lens near the receiver and the receiver is D1, and the distance between the side of the second lens near the display and the display is D3, and satisfies: 12≤D1 / D≤14, 0.015≤D2 / D≤0.059, 0.535≤D3 / D≤0.536.

[0011] In a preferred embodiment, the thickness of the first lens is D4, the thickness of the second lens is D5, and the following conditions are met: 0.159≤D4 / D≤0.380, 0.139≤D5 / D≤0.20.

[0012] In a preferred embodiment, the radius of curvature of the side of the first lens away from the receiving end is R1; the radius of curvature of the side of the second lens near the receiving end is R2, and the radius of curvature of the side away from the receiving end is R3, and satisfies: -25.0mm≤R1≤-20.35mm, -37.46mm≤R2≤-28.0mm, -79.0mm≤R3≤-65.60mm.

[0013] In a preferred embodiment, both the first lens and the second lens are plastic resin lenses.

[0014] A second aspect of this invention provides a VR device that includes the optical display system described in any of the foregoing embodiments.

[0015] The beneficial effects of this utility model are as follows: by setting the first lens and the second lens, it can effectively reduce the size and weight of the optical display system, effectively correct the aberration of the system, reduce distortion, improve the imaging quality, and thus reduce the weight and size of the VR device and improve the user experience of the VR device. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of the optical display system provided in an embodiment of the present invention;

[0017] Figure 2 An exploded view of the optical display system provided in an embodiment of this utility model;

[0018] Figure 3 Dot diagram of the optical display system provided in the embodiment of this utility model

[0019] Figure 4 Field curvature distortion curve of the optical display system provided in this embodiment of the utility model;

[0020] Figure 5 The transfer function curve of the optical display system provided in the embodiment of this utility model. Detailed Implementation

[0021] In this utility model, the terms "set up," "equipped with," and "connected" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or constituent parts. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0022] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0023] Furthermore, in addition to indicating direction or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this utility model according to the specific circumstances.

[0024] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0025] Specifically, the following is the content provided by the first aspect of this utility model:

[0026] Please refer to Figure 1 and Figure 2In this embodiment, the optical display system includes a receiver 1, a first lens 2, a second lens 3, and a display 4. The first lens 2 and the second lens 3 are sequentially arranged between the receiver 1 and the display 4 along the direction from the receiver 1 to the display 4. The display 4 can be a Micro OLED screen with a diagonal length of 16mm, a resolution of 1920*1080, and a pixel size of 7.3um. It is understood that the aforementioned parameters of the display 4 are for illustrative purposes only and do not limit this embodiment; the appropriate display 4 can be selected according to the actual design.

[0027] Specifically, a protective film 5 is provided on the side of the first lens 2 near the receiver 1, and a reflective polarizing film 6 is provided between the first lens 2 and the protective film 5; a first phase delay film 7 is provided on the side of the second lens 3 near the receiver 1; a semi-transparent and semi-reflective film 8 is provided on the side of the second lens 3 away from the receiver 1; a second phase delay film 9 is provided on the side of the display 4 near the second lens 3, and a linear polarizer 10 is provided between the second lens 3 and the second phase delay film 9.

[0028] Please refer to Figure 1 and Figure 2 After the display 4 emits light carrying imaging information, the light passes through the linear polarizer 10, where it is converted from unpolarized light to linearly polarized light. Then, it passes through the second phase retarder 9, where it is converted into right-hand circularly polarized light. The right-hand circularly polarized light then passes through the semi-reflective film 8, where its polarization state remains unchanged, but due to the effect of the film, it loses 50% of its light energy. The light then passes through the second lens 3, and then through the first phase retarder 7, where it is converted into P-polarized light. This P-polarized light is then projected onto the first lens 2. After passing through the first lens 2, the reflective polarizing film 6 reflects the P-polarized light again. The P-polarized light then passes through the first lens 2 again, and the first phase retarder 7 converts it back into right-hand polarized light. The right-hand polarized light then passes through the second lens 3 again, and the semi-reflective film 8 reflects it again, converting it into left-hand polarized light. After the left-handed polarized light passes through the second lens 3, the first phase delay film 7 converts the left-handed polarized light into S-polarized light. The S-polarized light passes through the first lens 2, the reflective polarizing film 6 and the protective film 5 in sequence, and is then projected into the receiving end 1 to form a clear image.

[0029] It is understandable that by setting the first lens 2 and the second lens 3, the number of optical lenses in the optical system can be effectively reduced, thereby reducing the size and weight of the optical display system. This can effectively correct system aberrations, reduce distortion, improve image quality, and thus reduce the weight and size of VR devices, improving the user experience of VR devices.

[0030] Furthermore, in one embodiment, the effective focal lengths of the first lens 2, the second lens 3, and the optical display system are F1, F2, and F, respectively, where F1 is a positive value and F2 is a negative value, and satisfy: 2.13≤F1 / F≤2.80, -23.49≤F2 / F≤-16.70.

[0031] Furthermore, the refractive indices of the first lens 2 and the second lens 3 at line D are N1 and N2, respectively, and satisfy: 1.514≤N1≤1.525, 1.640≤N2≤1.690. The Abbe numbers of the first lens 2 and the second lens 3 at line D are V1 and V2, respectively, and satisfy: 52.5≤V1≤63.0, 20.4≤V2≤32.6.

[0032] The radius of curvature of the side of the first lens 2 away from the receiver 1 is R1; the radius of curvature of the side of the second lens 3 near the receiver 1 is R2, and the radius of curvature of the side away from the receiver 1 is R3, and they satisfy: -25.0mm≤R1≤-20.35mm, -37.46mm≤R2≤-28.0mm, -79.0mm≤R3≤-65.60mm.

[0033] It is understandable that by setting the parameters of the first lens 2 and the second lens 3, the number of lenses in the optical system can be effectively reduced. While ensuring that the size and weight of the optical display system are relatively small, the imaging quality of the optical display system can be effectively ensured, system aberrations can be effectively corrected, and distortion can be reduced.

[0034] Furthermore, in one embodiment, the distance between the side of the first lens 2 away from the receiving end 1 and the side of the second lens 3 close to the receiving end 1 is D2, and D2 is adjustable, satisfying: 0.227mm≤D2≤0.886mm.

[0035] It is understandable that by dynamically adjusting the distance D2 between the side of the first lens 2 away from the receiver 1 and the side of the second lens 3 close to the receiver 1, the optical display system can achieve the function of adjusting the diopter between -2D and +2D, thereby better meeting the wearing needs of users with different myopia or hyperopia and improving the user experience.

[0036] Furthermore, the distance between the side of the first lens 2 furthest from the receiver 1 and the display 4 is D, the distance between the side of the first lens 2 closest to the receiver 1 and the receiver 1 is D1, and the distance between the side of the second lens 3 closest to the display 4 and the display 4 is D3, satisfying: 12≤D1 / D≤14, 0.015≤D2 / D≤0.059, 0.535≤D3 / D≤0.536. The thickness of the first lens 2 is D4, and the thickness of the second lens 3 is D5, satisfying: 0.159≤D4 / D≤0.380, 0.139≤D5 / D≤0.20.

[0037] It is understandable that by setting the thickness of the first lens 2, the thickness of the second lens 3, and the distance between each component in the optical display system, the size between each component in the optical display system can be effectively controlled, thereby effectively controlling the overall size of the optical display system, effectively reducing the volume and weight of the optical display system, and thus reducing the volume and weight of the VR device, improving the user's wearing experience.

[0038] Furthermore, in one embodiment, both the first lens 2 and the second lens 3 are plastic resin lenses. It is understood that using plastic resin lenses for both the first lens 2 and the second lens 3 can further reduce the weight of the optical display system, thereby reducing the burden on the user and improving the user experience.

[0039] For further details, please refer to... Figure 3 , Figure 3 This is a dot diagram of optical display systems corresponding to 0D, -1D, -2D, 1D, and 2D. Figure 3 The information indicates that when the refractive power is 0D, the root mean square radii of the six fields of view of the optical display system are 10.950µm, 7.905µm, 6.842µm, 8.161µm, and 9.916µm, respectively. This means that the root mean square radii of all field dot plots are below 11µm. After adjusting the refractive power of the optical display system, the root mean square radii of different fields of view change, but they remain within two pixel sizes, which is acceptable to the human eye.

[0040] For further details, please refer to... Figure 4 , Figure 4 The graphs show the field curvature distortion curves of the optical display systems corresponding to 0D, -1D, -2D, 1D, and 2D. Figure 4 According to the information provided, the field curvature of the optical display system is less than 0.2 mm under different refractive powers, and the distortion value in the entire field of view does not exceed 8.6%, which meets the design requirements for low distortion.

[0041] For further details, please refer to... Figure 5 , Figure 5 The graphs show the transfer function curves of the optical display systems corresponding to 0D, -1D, -2D, 1D, and 2D. Figure 5 The information indicates that, under full field of view, the transfer function value of the optical display system is as low as 0.2 at 70 l p / mm, which means that the image quality and resolution of the optical display system meet the design requirements.

[0042] In summary, by setting the first lens 2 and the second lens 3, this utility model can effectively reduce the size and weight of the optical display system, effectively correct the aberrations of the system, reduce distortion, improve imaging quality, and thus reduce the weight and size of the VR device and improve the user experience of the VR device.

[0043] The following is the content of the second aspect of this utility model:

[0044] This invention provides a VR device that includes the aforementioned optical display system. Through the optical display system, the VR device can achieve relatively good image quality while effectively reducing the weight and size of the VR device, thereby effectively improving the user experience.

[0045] The above are merely specific embodiments of this application. It should be noted that those skilled in the art can make several improvements and modifications without departing from the principles of this application, and these improvements and modifications should also be considered within the scope of protection of this application.

Claims

1. An optical display system, characterized by, The optical display system comprises a receiving end, a first lens, a second lens and a display; the first lens and the second lens are sequentially arranged between the receiving end and the display along a direction from the receiving end to the display; a protective film is arranged on a side of the first lens close to the receiving end; a reflective polarizing film is arranged between the first lens and the protective film; a first phase retardation plate is arranged on a side of the second lens close to the receiving end; a semi-transmissive and semi-reflective film is arranged on a side of the second lens away from the receiving end; and a second phase retardation plate is arranged on a side of the display close to the second lens, and a linear polarizing film is arranged between the second lens and the second phase retardation plate.

2. The optical display system of claim 1, wherein, Effective focal lengths of the first lens, the second lens and the optical display system are F1, F2 and F respectively, F1 is positive, F2 is negative, and 2.13≤F1 / F≤2.80 and -23.49≤F2 / F≤-16.70 are satisfied.

3. The optical display system of claim 2, wherein, Refractive indexes of the first lens and the second lens at D line are N1 and N2 respectively, and 1.514≤N1≤1.525 and 1.640≤N2≤1.690 are satisfied.

4. The optical display system of claim 1, wherein, Abbe numbers of the first lens and the second lens at D line are V1 and V2 respectively, and 52.5≤V1≤63.0 and 20.4≤V2≤32.6 are satisfied.

5. The optical display system of claim 1, wherein, A distance between a side of the first lens away from the receiving end and a side of the second lens close to the receiving end is D2, D2 is adjustable, and 0.227mm≤D2≤0.886mm is satisfied.

6. The optical display system of claim 5, wherein, A distance between the side of the first lens away from the receiving end and the display, a distance between a side of the first lens close to the receiving end and the receiving end, and a distance between a side of the second lens close to the display and the display are D, D1 and D3 respectively, and 12≤D1 / D≤14, 0.015≤D2 / D≤0.059 and 0.535≤D3 / D≤0.536 are satisfied.

7. The optical display system of claim 6, wherein, A thickness of the first lens is D4, a thickness of the second lens is D5, and 0.159≤D4 / D≤0.380 and 0.139≤D5 / D≤0.20 are satisfied.

8. The optical display system of claim 1, wherein, A curvature radius of the side of the first lens away from the receiving end is R1, a curvature radius of the side of the second lens close to the receiving end is R2, and a curvature radius of the side of the second lens away from the receiving end is R3, and -25.0mm≤R1≤-20.35mm, -37.46mm≤R2≤-28.0mm and -79.0mm≤R3≤-65.60mm are satisfied.

9. The optical display system of claim 1, wherein, The first lens and the second lens are plastic resin lenses.

10. A VR device, comprising: The optical display system comprises the optical display system according to any one of the preceding claims 1 to 9.

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