Virtual reality optical device
By setting a one-dimensional microlens array structure in VR head-mounted displays, the lens units are arranged at an angle to cover the pixels, forming a denser combination of pixels, which solves the screen-door effect problem, improves the visual experience and reduces costs.
Patent Information
- Application Number
- CN202520033757.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-07
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2035-01-07
AI Technical Summary
Existing VR headsets suffer from the screen-door effect, resulting in a poor visual experience, and increasing screen pixel density leads to higher costs.
A one-dimensional microlens array structure is set between the screen structure and the lens structure. The lens units are arranged in strips and placed at an angle. The coverage area is smaller than or equal to the pixel size on the screen structure. The focal length of the lens unit is equal to the distance between the pixel to form a denser combination of pixels.
It effectively reduces the screen-door effect, enhances the VR visual experience, and reduces equipment costs.
Smart Images
Figure CN223742871U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The present application relates to the technical field of virtual display, in particular to a virtual reality optical device. BACKGROUND
[0002] In a virtual reality (VR) head-mounted display device, due to the magnification effect of the lens, a screen door effect is easily formed, which seriously affects the experience. The industry usually solves the screen door effect by increasing the pixel density (Pixels Per Inch, PPI) of the screen, but a very high PPI will cause the cost of the screen to rise sharply. CONTENT OF THE UTILITY MODEL
[0003] The purpose of the present application is to provide a virtual reality optical device to solve the problem of screen door effect in low-cost VR head-mounted display devices in the prior art.
[0004] To achieve the above purpose, the embodiments of the present application provide a virtual reality optical device, comprising: a lens structure, a screen structure and a one-dimensional microlens array structure located between the lens structure and the screen structure;
[0005] The one-dimensional microlens array structure comprises a plurality of lens units, and the plurality of lens units are arranged in a strip shape extending in a first direction, forming a plurality of parallel and spaced strip-shaped lenses;
[0006] The first direction is placed obliquely relative to the vertical direction of the screen structure, forming a preset included angle;
[0007] The coverage range of the lens unit is less than or equal to the size of the corresponding pixel point on the screen structure.
[0008] Optionally, the focal length of each lens unit is equal to the distance between the lens unit and the corresponding pixel point on the screen structure.
[0009] Optionally, the lens unit is a spherical convex lens.
[0010] Optionally, the virtual reality optical device further comprises:
[0011] a base layer structure;
[0012] The base layer structure is attached to the screen structure and is located on the light-emitting side of the screen structure.
[0013] The one-dimensional microlens array structure is arranged on the base layer structure, and the one-dimensional microlens array structure faces the lens structure.
[0014] Optionally, the base structure is made of any one of glass, acrylic, polyethylene terephthalate (PET) or UV material.
[0015] Optionally, the lens structure and the screen structure have a first distance therebetween; the first distance is less than or equal to a focal length of the lens structure.
[0016] Optionally, the preset included angle is less than 90 degrees and greater than 0 degrees.
[0017] The beneficial effects of the above technical solutions of the present application are as follows:
[0018] In the embodiment of the present application, the virtual reality optical device comprises a lens structure, a screen structure and a one-dimensional microlens array structure between the lens structure and the screen structure; the one-dimensional microlens array structure comprises a plurality of lens units, the plurality of lens units are arranged in a strip shape and extend in a first direction, forming a plurality of parallel and spaced strip-shaped lenses; the first direction is placed obliquely relative to the vertical direction of the screen structure, forming a preset included angle; the coverage range of the lens unit is less than or equal to the size of the corresponding pixel point on the screen structure. The scheme of the present application can inhibit the screen window effect of the virtual reality optical device in the prior art by attaching the one-dimensional microlens array structure to the screen structure, so that the coverage range of the lens unit is less than or equal to the size of the corresponding pixel point on the screen structure. BRIEF DESCRIPTION OF DRAWINGS
[0019] Figure 1 A structure schematic diagram of the virtual reality optical device provided by the embodiment of the present application is provided;
[0020] Figure 2 A structure schematic diagram of the one-dimensional microlens array structure provided by the embodiment of the present application is provided;
[0021] Figure 3 A schematic diagram of the adjustment of the light path by the one-dimensional lens array structure provided by the embodiment of the present application is provided. DETAILED DESCRIPTION
[0022] In order to make the technical problems, technical solutions and advantages to be solved by the present application more clear, the following will be described in detail with reference to the drawings and specific embodiments.
[0023] It should be understood that the "one embodiment" or "an embodiment" mentioned throughout the specification means that the specific features, structures or characteristics related to the embodiment are included in at least one embodiment of the present application. Therefore, "in one embodiment" or "in an embodiment" appearing throughout the specification does not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in one or more embodiments in any suitable manner.
[0024] The term "and / or" in the embodiments of the present application describes the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can represent the following three cases: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after it.
[0025] The term "multiple" in the embodiments of the present application means two or more, and other quantifiers are similar.
[0026] The technical solutions in the embodiments of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.
[0027] Referring to FIGS. 1 to 3, Figure 1 and Figure 2 The embodiments of the present application provide a virtual reality optical device, which comprises a lens structure 101, a screen structure 100 and a one-dimensional microlens array structure 200 located between the lens structure 101 and the screen structure 100.
[0028] The one-dimensional microlens array structure 200 comprises a plurality of lens units, and the plurality of lens units are arranged in a strip shape and extend in a first direction L, forming a plurality of parallel and spaced strip-shaped lenses 201.
[0029] The first direction L is placed obliquely relative to the vertical direction of the screen structure 100, forming a preset included angle.
[0030] The coverage range of the lens unit is less than or equal to the size of the corresponding pixel point 1001 on the screen structure 100.
[0031] It should be noted that the lens structure 101 is to magnify the picture of the screen structure 100, so that the eye sees a magnified virtual image through the lens structure 101. Due to the magnification of the lens structure 101, the pixel light points on the screen structure 100 will be magnified. The screen structure 100 is usually composed of technologies such as LCD, OLED, MicroLED or MicroOLED, which uses R, G, B pixels to represent different colors of visible light in nature. By adjusting the light intensity of RGB (red, green, blue) pixels, most of the wavelengths of visible light in nature can be obtained through their mixing, so as to represent most of the colors of visible light. However, the RGB pixels have a certain regular shape, and due to the requirements of technology, there are also intervals between the RGB pixels. The interval area is not transparent or not light-emitting. Therefore, the pixel point on the screen structure 100 is a rectangular array of regularly arranged RGB pixels with black intervals. Each RGB pixel can be regarded as a tiny particle. In the normal display mode without the lens structure 101, the human eye is far away from the screen, and it is not clear to see the tiny particles. However, when the lens structure 101 is magnified, the human eye is close to the screen, and it is easy to see the particles, forming the so-called screen door effect. In order to weaken the screen door effect by simply increasing the pixel density (PPI) of the screen structure 100, the present application proposes to attach a one-dimensional microlens array structure 200 between the screen structure 100 and the lens structure 101 to achieve the effect of weakening the screen door effect at a low cost.
[0032] Specifically, the one-dimensional microlens array structure 200 includes a plurality of lens units, and the plurality of lens units are arranged in a strip shape and extend in a first direction L to form a plurality of parallel and spaced strip-shaped lenses 201; the first direction L is placed obliquely relative to the vertical direction of the screen structure 100 to form a preset included angle. The coverage of the lens unit is less than or equal to the size of the corresponding pixel point 1001 on the screen structure 100, and the adjustment effect is generated in the direction perpendicular to the extension direction (i.e. the first direction) of the lens unit, forming more dense combined pixels.
[0033] In order to enable the horizontal and vertical directions to produce the effect of combined pixels and reduce the screen door effect, the strip-shaped lens 201 of the one-dimensional lens array structure is placed obliquely relative to the vertical direction of the screen structure 100 to form a preset included angle, so that both the horizontal and vertical directions can form more dense combined pixels, thereby reducing the screen door effect and improving the VR visual experience.
[0034] Optionally, the lens structure 101 and the screen structure 100 have a first distance D; the first distance D is less than or equal to the focal length F of the lens structure 101.
[0035] In this embodiment of the application, while ensuring that the first distance D is less than the focal length F of the lens structure 101, it is possible to obtain a reasonable, distorted virtual image on the screen and effectively reduce the thickness of the virtual reality optical device.
[0036] Optionally, the lens unit is a spherical convex lens.
[0037] In the embodiments of this application, reference is made to Figure 2 As shown, the cross-section of the lens unit 2010 in the direction perpendicular to the first direction L is... Figure 2 The cross-sectional structure shown is that the lens unit 2010 has a spherical convex lens cross-section. The "one-dimensional" in the arrangement of microlenses on the one-dimensional microlens array structure 200 can be understood as meaning that the cross-section of any lens unit along the first direction L of the strip lens 201 is a spherical convex lens. The spherical convex lens can be used to converge the light emitted from the pixels into parallel light rays that are projected onto the screen.
[0038] Optionally, the focal length f of each lens unit is equal to the distance between the lens unit and the corresponding pixel on the screen structure 100.
[0039] In this embodiment, each lens unit in the one-dimensional microlens array structure 200 has a cross-section perpendicular to the first direction L, which is a cross-section of the lens structure, displayed as a spherical convex lens. A strip lens 201 is formed from the extension direction of the first direction L. The focal length f of each lens unit must be equal to or approximately equal to the distance s from the small lens (i.e., the lens unit) to the screen pixel light-emitting point (i.e., the pixel). The horizontal span w of each lens unit must be less than the minimum size t of the screen pixel light-emitting point in the two-dimensional direction (the horizontal and vertical directions of the pixel). That is, the coverage area of the lens unit is less than or equal to the size of the corresponding pixel 1001 on the screen structure 100. Furthermore, the strip lens is placed at an angle relative to the vertical direction of the display screen.
[0040] Optionally, the virtual reality optical device further includes:
[0041] Basic structure;
[0042] The base structure is attached to the screen structure and is located on the light-emitting side of the screen structure;
[0043] The one-dimensional microlens array structure is disposed on the base layer structure, and the one-dimensional microlens array structure faces the lens structure.
[0044] Optionally, the base structure may be made of any one of the following materials: glass, acrylic, polyethylene terephthalate (PET), or UV material.
[0045] In the embodiment of the present application, a base layer structure is added between the lens 101 and the screen structure 100, which is attached to the screen structure 100. The base layer structure can be made of glass, acrylic, PET, UV material (UV material is a material that is cured by UV (ultraviolet) radiation), etc., and has convex lens microstructures on it.
[0046] It is particularly noted that although the present application is based on the improvement of the traditional VR optical path structure, the pancake folded optical path or the optical path of multiple combined lenses that are popular now can also be used. Although the pancake folded optical path shortens the distance from the lens to the screen by allowing the light to be refracted back and forth between the lens and the screen, or the multiple combined lenses improve the distortion of the single lens and compress the focal length to shorten the distance from the lens to the screen. However, the idea of suppressing the screen window proposed in the present application can also be applied to the screens of the above optical structures.
[0047] Optionally, the range of the preset included angle is less than 90 degrees and greater than 0 degrees.
[0048] Specifically, the lens unit 2010 in each one-dimensional micro-lens array structure 200 can mix the originally larger size RGB three-primary color pixels into RGB combined pixels. Since the size of the lens unit 2010 is smaller than the size of the corresponding pixel point, it can be understood that the one-dimensional lens array forms a screen with smaller pixel size. Each small lens can be regarded as an RGB combined pixel, which obtains higher pixel density and is conducive to reducing the screen window effect.
[0049] Optionally, the one-dimensional micro-lens array structure 200 can also be replaced by a two-dimensional micro-lens array structure. Here, the adjustment principle of the lens unit in the one-dimensional micro-lens array structure 200 to the light emitted by the pixel is consistent with that of the two-dimensional lens array structure. Only in one direction, that is, the direction perpendicular to the extension direction of the lens unit (the first direction L in the figure), the adjustment effect is generated to form more dense combined pixels. Therefore, in order to make the horizontal and vertical directions both have the effect of combined pixels and reduce the screen window effect, the strip-shaped lens extension direction of the one-dimensional lens array structure is placed obliquely to the vertical direction of the screen. In this way, both horizontal and vertical directions can form more dense combined pixels, thereby reducing the screen window effect and improving the VR visual experience. Figure 2
[0050] The principle of the one-dimensional micro-lens array structure 200 is as follows: Figure 3 The tilted one-dimensional lens array is not a standard lens structure in the horizontal direction and the vertical direction, and the width of the lens unit is equivalent to being enlarged, so the equivalent focal length of the lens in the two cross sections is larger than the focal length of the lens obtained in the cross section perpendicular to the extension direction of the lens array, and the light emitted by the pixels can be regarded as divergent light in the horizontal and vertical directions, but not completely divergent as without lens modulation. Therefore, it can be imagined that the equivalent lens in the horizontal and vertical cross-sectional directions can still obtain more dense pixels, but the density of the pixels is slightly lower than that of the two-dimensional lens effect, but the advantage is that the one-dimensional lens is easier to process.
[0051] In summary, by attaching a one-dimensional microlens array structure on the screen structure in the embodiment of the application, the coverage of the lens unit is less than or equal to the size of the corresponding pixel point on the screen structure, which can inhibit the screen window effect of the virtual reality optical device in the prior art.
[0052] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.
[0053] In addition, the terms "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise specifically limited.
[0054] In the present application, unless otherwise specifically defined and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood in a broad sense, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected or can communicate with each other; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication or interaction relationship of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.
[0055] In the utility model, unless another definite provision and limitation, first feature is "on" or "under" second feature can include that first and second features are directly contacted, also can include that first and second features are not directly contacted but are contacted through other feature between them. Moreover, first feature "on", "above" and "upper surface" of second feature include that first feature is directly above and obliquely above second feature, or only indicate that horizontal height of first feature is higher than second feature. First feature "under", "below" and "lower surface" of second feature include that first feature is directly below and obliquely below second feature, or only indicate that horizontal height of first feature is less than second feature.
[0056] The above is the preferred embodiment of the utility model, it should be pointed out that for ordinary personnel in this technical field, without departing from the principle of the utility model described in the premise still can make a number of improvements and refinements, these improvements and refinements are also within the protection scope of the utility model.
Claims
1. A virtual reality optical device, characterized by, The virtual reality optical device comprises: a lens structure, a screen structure and a one-dimensional micro-lens array structure located between the lens structure and the screen structure; the one-dimensional micro-lens array structure comprises a plurality of lens units, and the plurality of lens units are arranged in a strip shape and extend in a first direction, forming a plurality of parallel and spaced strip-shaped lenses; the first direction is arranged obliquely relative to the vertical direction of the screen structure, forming a preset included angle; the coverage of the lens unit is less than or equal to the size of the corresponding pixel point on the screen structure.
2. The virtual reality optical apparatus of claim 1, wherein, the focal length of each lens unit is equal to the distance between the lens unit and the corresponding pixel point on the screen structure.
3. The virtual reality optical apparatus of claim 1, wherein, the lens unit is a spherical convex lens.
4. The virtual reality optical apparatus of claim 1, wherein, The virtual reality optical device further comprises: a base layer structure; the base layer structure is attached to the screen structure and located on the light-emitting side of the screen structure; the one-dimensional micro-lens array structure is arranged on the base layer structure, and the one-dimensional micro-lens array structure faces the lens structure.
5. The virtual reality optical apparatus of claim 4, wherein, The base layer structure is made of any one of glass, acrylic, polyethylene terephthalate (PET) or UV material.
6. The virtual reality optical apparatus of claim 1, wherein, The lens structure and the screen structure have a first distance; the first distance is less than or equal to the focal length of the lens structure.