CN210720881U - Coaxial near-to-eye display system based on free-form surface reflection - Google Patents
Coaxial near-to-eye display system based on free-form surface reflection Download PDFInfo
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- CN210720881U CN210720881U CN201921591003.1U CN201921591003U CN210720881U CN 210720881 U CN210720881 U CN 210720881U CN 201921591003 U CN201921591003 U CN 201921591003U CN 210720881 U CN210720881 U CN 210720881U
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Abstract
The utility model discloses a coaxial near-to-eye display system based on free-form surface reflection. The coaxial near-eye display system based on free-form surface reflection comprises an image source, a spectroscope and a free-form surface mirror. The coaxial near-to-eye display system based on free-form surface reflection utilizes a free-form surface type, and can realize higher imaging quality by using fewer lenses; moreover, the coaxial near-eye display system based on free-form surface reflection is a coaxial system, so that the assembly is easier, and the production yield is high; furthermore coaxial near-to-eye display system based on free-form surface reflection compact structure, occupation space are littleer, have solved the near-to-eye display scheme image quality of present adoption poor, the assembly degree of difficulty is big and the extravagant serious problem in space.
Description
Technical Field
The utility model relates to a near-to-eye display system designs technical field, especially relates to a coaxial near-to-eye display system based on free-form surface reflection.
Background
Augmented reality is a technology for fusing virtual information and a real world, wherein the design of a near-eye display system is a key link in the augmented reality technology, and how to simultaneously improve the field angle, brightness, uniformity and contrast of the near-eye display system and reduce the power consumption and volume of the system is a hotspot problem in the research field.
Various near-to-eye display schemes have been introduced on the market, such as the reflective prism of Google glass, the holographic volume grating of microsoft hololens (microsoft hololens), the geometric array waveguide of lumus (located by the manufacturers of AR glasses optics in israel), and the free-form surface prism of beijing physics university, among others. The reflective prism has a simple structure, but the field angle is small; on one hand, the holographic body grating is difficult to process, and on the other hand, the problems of small field angle, serious dispersion and the like also exist; the geometric array waveguide is a good technical scheme, but the waveguide element cannot design the focal power, so that the use limitations are brought; the free-form surface prism is an off-axis system, so that on one hand, large off-axis aberration exists, and strict requirements are required for later processing and assembly, so that the free-form surface prism is not beneficial to mass production and faces consumers. Patent No. CN108227205 also discloses a near-to-eye display scheme, which is not compact enough in structure, resulting in much space waste; in addition, the energy utilization rate is less than 6% in theoretical calculation, and an additional light blocking device is needed to eliminate the influence of external stray light.
Disclosure of Invention
The utility model aims at providing a coaxial near-to-eye display system based on free-form surface reflection to solve the near-to-eye display scheme image quality that adopts at present poor, the assembly degree of difficulty is big and the extravagant serious problem in space.
In order to achieve the above object, the utility model provides a following scheme:
a free-form surface reflection based coaxial near-eye display system, comprising: an image source, a spectroscope and a free-form surface mirror; the spectroscope is arranged on an emergent light path of the image source; the free-form surface mirror is arranged on a reflection light path of the spectroscope; the spectroscope and the free-form surface mirror have partial reflection and partial transmission functions on visible light wave bands; the light emitted by the image source is incident on the light splitting surface of the spectroscope to form a transmission shunt and a reflection shunt; the reflection branch enters a part of reflection partial transmission surface of the free-form surface mirror and then is reflected to form a reflection light path; the reflection light path is received by human eyes after passing through the beam splitting surface and the film coating surface of the spectroscope to form a virtual information light path; external ambient light penetrates through the light-transmitting surface of the free-form surface mirror and the partial reflection partial light-transmitting surface and then enters human eyes, and is superposed with the virtual information light path; the light splitting surface is a mirror surface of the spectroscope far away from one side of human eyes; the film coating surface is a mirror surface of the spectroscope close to one side of the human eye; the partial reflection partial transmission surface is a mirror surface of the free-form surface mirror close to one side of human eyes; the light-transmitting surface is a mirror surface on one side of the free-form surface mirror far away from human eyes.
Optionally, a projection lens group is further arranged between the image source and the spectroscope; the projection lens group is arranged on an emergent light path of the image source; the spectroscope is arranged on an emergent light path of the projection lens group.
Optionally, the spectroscope, the free-form surface mirror and the projection lens group are made of optical plastics or optical glass, and the surface type is a spherical surface or an aspherical surface.
Optionally, the image source is a liquid crystal display LCD, an organic light emitting diode OLED, a digital light processing technology DLP projector, or a liquid crystal on silicon LCOS.
Optionally, the beam splitter is a polarizing beam splitter.
Optionally, an 1/4 wave plate is further disposed between the beam splitter and the free-form surface mirror.
Optionally, a linear polarizing film is attached to the film-coated surface of the side of the spectroscope close to the human eye.
According to the utility model provides a concrete embodiment, the utility model discloses a following technological effect:
the utility model provides a coaxial near-to-eye display system based on free-form surface reflection, coaxial near-to-eye display system based on free-form surface reflection includes image source, spectroscope and free-form surface mirror. The coaxial near-to-eye display system based on free-form surface reflection utilizes a free-form surface type, and can realize higher imaging quality by using fewer lenses; moreover, the coaxial near-eye display system based on free-form surface reflection is a coaxial system, so that the assembly is easier, and the production yield is high; furthermore coaxial near-to-eye display system based on free-form surface reflection compact structure, occupation space are littleer, have solved the near-to-eye display scheme image quality of present adoption poor, the assembly degree of difficulty is big and the extravagant serious problem in space.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings provided by the present invention without any creative effort.
Fig. 1 is a schematic view of a virtual information optical path according to a first embodiment of the present invention, which is a coaxial near-to-eye display system based on free-form surface reflection;
fig. 2 is a schematic diagram of a real-world optical path of a first embodiment of a coaxial near-to-eye display system based on free-form surface reflection according to the present invention;
fig. 3 is a schematic diagram of an imaging quality modulation transfer function according to a first embodiment of the present invention of a coaxial near-to-eye display system based on free-form surface reflection;
fig. 4 is a distortion curve diagram of a first embodiment of a coaxial near-to-eye display system based on free-form surface reflection according to the present invention;
fig. 5 is a schematic view of a virtual information optical path of a second embodiment of the coaxial near-to-eye display system based on free-form surface reflection according to the present invention;
the numbers in the figures are respectively: 1. human eye, 2 spectroscope, 3 freeform surface mirror, 4 first projection lens, 5 second projection lens, 6 image source, 7, 1/4 wave plate.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The utility model aims at providing a coaxial near-to-eye display system based on free-form surface reflection to solve the near-to-eye display scheme image quality that adopts at present poor, the assembly degree of difficulty is big and the extravagant serious problem in space.
In order to make the above objects, features and advantages of the present invention more comprehensible, the present invention is described in detail with reference to the accompanying drawings and the detailed description.
The utility model provides a coaxial near-to-eye display system based on free-form surface reflection includes: an image source 6, a spectroscope 2 and a free-form surface mirror 3. Wherein the spectroscope 2 is arranged on an emergent light path of the image source 6; the free-form surface mirror 3 is arranged on a reflection light path of the spectroscope 2; the spectroscope 2 and the free-form surface mirror 3 both have partial reflection and partial transmission functions for visible light wave bands. The partially reflecting and partially transmitting functions can be realized by plating a partially reflecting and partially transmitting film on the splitting surface 202 of the beam splitter 2 and the partially reflecting and partially transmitting surface 301 of the free-form surface mirror 3.
The working process of the coaxial near-to-eye display system based on free-form surface reflection is as follows:
the light emitted by the image source 6 is incident on the beam splitting surface 201 of the beam splitter 2 to form a transmission branch and a reflection branch; the reflection branch enters a part of reflection partial transmission surface 301 of the free-form surface mirror 3 and then is reflected to form a reflection optical path; the reflected light path is received by human eyes 1 after passing through the beam splitting surface 202 and the film coating surface 201 of the spectroscope 2, so as to form a virtual information light path. And external ambient light penetrates through the light-transmitting surface 302 of the free-form surface mirror 3 and the partial reflection partial light-transmitting surface 301 and then enters the human eyes 1, and is superposed with the virtual information light path to realize the augmented reality function.
Fig. 1 is a schematic view of a virtual information optical path according to a first embodiment of the present invention, which is a coaxial near-to-eye display system based on free-form surface reflection. Fig. 2 is a schematic view of a real world optical path of a first embodiment of a coaxial near-to-eye display system based on free-form surface reflection according to the present invention. The embodiment of the utility model provides an all adopt the level to be Z axle direction right, be Y axle direction on the perpendicular Z axle, be the right hand coordinate system of X axle direction inwards on the perpendicular YOZ plane paper, the origin of coordinates is located the center of exit pupil position.
As shown in fig. 1 and 2, a coaxial near-to-eye display system based on free-form surface reflection according to an embodiment of the present invention includes a spectroscope 2, a free-form surface mirror 3, a projection lens set (including a first projection lens 4 and a second projection lens 5), and an image source 6. The projection lens group is arranged between the image source 6 and the spectroscope 2; the projection lens group is arranged on an emergent light path of the image source 6; the spectroscope 2 is arranged on an emergent light path of the projection lens group.
The two mirror surfaces of the spectroscope 2 are a spectroscopic surface 202 and a coating surface 201 respectively, and the spectroscopic surface 202 is the mirror surface of the spectroscope 2 far away from the human eye 1; the film coating surface 201 is a mirror surface of the spectroscope 2 close to one side of the human eye 1. The two mirror surfaces of the free-form surface mirror 3 are a partially reflecting and partially transmitting surface 301 and a partially reflecting and partially transmitting surface 302, respectively. The partial reflection partial transparent surface 301 is a mirror surface of the free-form surface mirror 3 close to one side of human eyes 1; the light-transmitting surface 302 is a mirror surface of the free-form surface mirror 3 on a side away from the human eye 1. The first projection lens 4 has a first mirror 401 and a second mirror 402. The second projection lens 5 has a third mirror 501 and a fourth mirror 502.
The beam splitter 2 and the free-form surface mirror 3 have partial reflection and partial transmission effects on visible light bands (430-680 nm). Partial reflection part transmission effect can be realized through plating partial reflection part transmission membrane on splitting surface 202 and partial reflection part transmission surface 301, the utility model provides a well coating film transmissivity is 50%, reflectivity 50% promptly partial reflection part transmission surface 301 is half anti semi-transparent surface.
As shown in fig. 1, light emitted from the image source 6 is transmitted by the second projection lens 5 and the first projection lens 4 and then enters the splitting surface 202 of the beam splitter 2 to form two branches of transmission and reflection, the reflected branch enters the semi-reflective and semi-transparent surface 301 of the free-form surface mirror 3 and then is reflected and then returns to the beam splitter 2, and the reflected branch is received by the human eyes 1 after passing through the splitting surface 202 and the film coating surface 201 to form a virtual information light path. As shown in fig. 2, external ambient light passes through the light-transmitting surface 302 and the semi-reflecting and semi-transmitting surface 301 of the free-form surface mirror 3, passes through the light-splitting surface 202 and the film-coated surface 201 of the spectroscope 2, enters the human eye 1, and is superimposed on the virtual information light path, thereby realizing the augmented reality function.
The image source 1 may be one of a Liquid Crystal Display (LCD), an organic light-Emitting Diode (OLED), a Digital Light Processing (DLP) projector, and a Liquid Crystal On Silicon (LCOS).
The first projection lens 4 and the second projection lens 5 in the projection lens group are relay lenses for improving the imaging quality.
The spectroscope 2, the free-form surface mirror 3 and the projection lens group can be made of optical plastics or optical glass, and have good light transmission; the surface shape of the spherical lens can be spherical or aspherical. Wherein the aspheric expression is:
in equation (1), Z is an aspherical rise, R is a surface curvature radius, R is a lens radius, and k is a conic constant. A. B, C, D … are aspheric coefficients of order 4, 6, 8, 10 …, respectively.
The lens surface type of the free-form surface mirror 3 is an XY polynomial, and the specific expression is as follows:
in the formula (2), x, y and z are coordinates of points on the curved surface, R is the surface curvature radius, k is a conic constant, C(m，n)Is a corresponding polynomial xmynP is the highest power of the polynomial, m, n are the degree of the x term and the y term respectively; m + n is more than or equal to 1 and less than or equal to p.
As preferred, spectroscope 2 can be polarization spectroscope, can improve like this the utility model discloses near-to-eye display system's efficiency improves the display brightness under the prerequisite that image source 1 does not change.
Preferably, a linear polarizing film may be attached to the film-coated surface 201 of the beam splitter 2 on a side close to the human eye, so that the influence of external stray light can be eliminated without additional physical shielding, and the contrast of virtual information display can be improved.
The embodiment of the utility model provides a face type parameter data table is shown as table 1:
TABLE 1 example Table of one-dimensional parameter data
The diaphragm in table 1 is the human eye, and the exit pupil diameter of the first embodiment is 8mm, the exit pupil distance is 14mm, the full field angle is 40 degrees, and the Modulation Transfer Function (MTF) value of the full field is greater than 0.2 at 30lp/mm, as shown in fig. 3. Distortion of the full field of view is less than 3%, e.g
As shown in fig. 4. Figure 4 shows the abscissa as a percentage and the ordinate as distortion.
Fig. 5 is a schematic view of a virtual information optical path according to the second embodiment of the coaxial near-to-eye display system based on free-form surface reflection. As shown in fig. 5, the second embodiment of the present invention is different from the first embodiment in that the beam splitter 2 is further constrained to be a polarization beam splitter based on the first embodiment, and an 1/4 wave plate 7 is added between the beam splitter 2 and the free-form surface mirror 3 for improving the display brightness. The 1/4 wave plates 7 are respectively arranged on the respective reflection light paths of the spectroscope 2 and the free-form surface mirror 3.
In this embodiment, the splitting surface 202 of the polarizing beam splitter 2 is a reflective S-transmissive P-polarizing reflective film, light emitted from the image source 6 is transmitted through the second projection lens 5 and the first projection lens 4 and then incident on the splitting surface 202 of the beam splitter 2, and the light is split into two polarized lights; the S light is reflected to pass through 1/4 wave plate 7 and then becomes circularly polarized light, then is reflected to the semi-reflecting and semi-transmitting surface 301 of the free-form surface mirror 3 and then returns to 1/4 wave plate 7, and becomes P light after being transmitted, and then is received by human eyes 1 after being transmitted through the light splitting surface 202 and the film coating surface 201 to form a virtual information light path; through theoretical calculation, the display brightness can be improved by 1 time by adopting the technical route on the premise that the image source 1 is not replaced, and the original imaging quality is not influenced.
As a further preferred method, as shown in fig. 5, a linear polarizing film may be attached to the surface of the coating surface 201 of the beam splitter 2. Assuming that the beam splitting surface 202 of the polarization beam splitter 2 is a reflective film of reverse S-transmission P-polarization, a linear polarization film for transmitting P-light is attached to the surface of the film coating surface 201. Therefore, the external stray light from the lower part of the lens of the coated surface 201 cannot be reflected by the surface of the coated surface 201 and the surface of the light splitting surface 202 to enter the human eye 1, so that the influence of the external stray light can be eliminated under the condition of no additional physical shielding, and the display contrast of the virtual information is improved.
It is thus clear that compare in current other near-to-eye display systems, the utility model provides a coaxial near-to-eye display system based on free-form surface reflection has following advantage at least:
1. the coaxial near-to-eye display system based on free-form surface reflection of the utility model utilizes the free-form surface type, and can realize higher imaging quality by using fewer lenses; moreover, the coaxial system is easy to assemble and high in production yield;
2. the coaxial near-eye display system based on free-form surface reflection adopts a polarization method to improve the display brightness, so that the energy utilization rate can be effectively improved;
3. the coaxial near-to-eye display system based on free-form surface reflection can eliminate the influence of external stray light under the condition of no additional physical shielding, and the virtual information display contrast is improved.
The above description is only for the preferred embodiment of the present invention, but the protection scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention should be covered by the protection scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
The principle and the implementation of the present invention are explained herein by using specific examples, and the above description of the embodiments is only used to help understand the device and the core idea of the present invention; meanwhile, for the general technical personnel in the field, according to the idea of the present invention, there are changes in the concrete implementation and the application scope. In summary, the content of the present specification should not be construed as a limitation of the present invention.
Claims (7)
1. A free-form surface reflection based coaxial near-eye display system, comprising: an image source, a spectroscope and a free-form surface mirror; the spectroscope is arranged on an emergent light path of the image source; the free-form surface mirror is arranged on a reflection light path of the spectroscope; the spectroscope and the free-form surface mirror have partial reflection and partial transmission functions on visible light wave bands; the light emitted by the image source is incident on the light splitting surface of the spectroscope to form a transmission shunt and a reflection shunt; the reflection branch enters a part of reflection partial transmission surface of the free-form surface mirror and then is reflected to form a reflection light path; the reflection light path is received by human eyes after passing through the beam splitting surface and the film coating surface of the spectroscope to form a virtual information light path; external ambient light penetrates through the light-transmitting surface of the free-form surface mirror and the partial reflection partial light-transmitting surface and then enters human eyes, and is superposed with the virtual information light path; the light splitting surface is a mirror surface of the spectroscope far away from one side of human eyes; the film coating surface is a mirror surface of the spectroscope close to one side of the human eye; the partial reflection partial transmission surface is a mirror surface of the free-form surface mirror close to one side of human eyes; the light-transmitting surface is a mirror surface on one side of the free-form surface mirror far away from human eyes.
2. The freeform surface reflection based coaxial near-to-eye display system of claim 1, wherein a projection lens group is further disposed between the image source and the beam splitter; the projection lens group is arranged on an emergent light path of the image source; the spectroscope is arranged on an emergent light path of the projection lens group.
3. The free-form surface reflection-based coaxial near-to-eye display system of claim 2, wherein the beam splitter, the free-form surface mirror, and the projection lens group are made of optical plastic or optical glass, and the surface shape is spherical or aspherical.
4. The freeform reflection based coaxial near-to-eye display system of claim 1, wherein the image source is a Liquid Crystal Display (LCD), an Organic Light Emitting Diode (OLED), a Digital Light Processing (DLP) projector, or a Liquid Crystal On Silicon (LCOS).
5. The freeform reflection based coaxial near-to-eye display system of claim 1, wherein the beam splitter is a polarizing beam splitter.
6. The freeform reflection based coaxial near-to-eye display system of claim 5, wherein an 1/4 wave plate is further disposed between the beam splitter and the freeform mirror.
7. The freeform reflection based coaxial near-to-eye display system of claim 1 wherein a linear polarizing film is applied to the coated side of the beam splitter on the side adjacent to the human eye.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111965828A (en) * | 2020-08-28 | 2020-11-20 | Oppo广东移动通信有限公司 | Wearable device and image projection method |
| CN115826251A (en) * | 2023-02-23 | 2023-03-21 | 沂普光电(天津)有限公司 | VR lens structure and VR display system |
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2019
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111965828A (en) * | 2020-08-28 | 2020-11-20 | Oppo广东移动通信有限公司 | Wearable device and image projection method |
| CN115826251A (en) * | 2023-02-23 | 2023-03-21 | 沂普光电(天津)有限公司 | VR lens structure and VR display system |
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Effective date of registration: 20220308 Address after: 518000 9 / F, building 6, Shenzhen Shantou Special Cooperation Zone fashion brand industrial park, EBU Town, Shenzhen Shantou Special Cooperation Zone, Guangdong Province Patentee after: Long optoelectronics Co.,Ltd. Address before: 518018 room 404, Skyworth Digital Building, Shiyan street, Bao'an District, Shenzhen City, Guangdong Province Patentee before: SHENZHEN LOCHN OPTICS TECHNOLOGY Co.,Ltd. |