CN210776039U - Miniaturized short-distance optical system - Google Patents
Miniaturized short-distance optical system Download PDFInfo
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- CN210776039U CN210776039U CN201921535245.9U CN201921535245U CN210776039U CN 210776039 U CN210776039 U CN 210776039U CN 201921535245 U CN201921535245 U CN 201921535245U CN 210776039 U CN210776039 U CN 210776039U
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Abstract
The utility model provides a miniaturized short distance optical system, it includes a display screen, a reflective polarization component, a first phase delay piece, a part according to the preface pierces through partial reflection component, an at least optical element and locates a lens of above-mentioned component arbitrary side. The optical element may be a circular polarizer or a combination of a second phase retarder and a line polarizer. Display screen output image and after sending light, light penetrates between partial reflection component twice at reflective polarization component and part, makes light pass through first phase delay piece cubic, after light process cubic phase delay, light that phase delay passes through this part of penetration partial reflection component through the third time to carry out fourth time phase delay through optical element, light that phase delay passes through at last in a lens leading-in at least one people's eye, and only set up single lens and can let the utility model discloses an optical system whole thickness is littleer, reaches miniaturized purpose.
Description
Technical Field
The present invention relates to an optical system, and more particularly to a miniaturized short-distance optical system for a head-mounted display.
Background
A Head-mounted display (Head-mounted display) is a device for displaying images and colors, and is usually in the form of an eye mask or a helmet, in which a display screen is placed close to the eyes of a user, and a focal length is adjusted through an optical path to project pictures to the eyes in a short distance, so as to generate a virtual reality effect and increase the sense of presence of the wearer.
Fig. 1 is a schematic diagram of an optical system of a virtual reality head-mounted display, in which a display screen 10 projects an image, and the image passes through an optical path with an optical path length d and then enters an optical module 23, the optical module 23 is a single lens or a combination of a plurality of lenses, and is used to guide the image into a human eye 24 of a user, assuming that the optical path length d is 40mm, and the length of the head-mounted display is the optical path length d plus the thickness, eye distance, and housing of the optical module, and the sum of the optical path length d and the thickness, eye distance, and housing of the optical module is slightly heavy for an eye mask and a helmet worn on the head, and the burden on the nose bridge, the top of the head, and the neck of the user cannot be worn for a long time.
Therefore, the present invention provides a miniaturized short-distance optical system, which can shorten the distance of the optical system, and further enlarge the field of view, effectively solve the above problems, and the detailed structure and the implementation thereof will be described in detail.
SUMMERY OF THE UTILITY MODEL
A primary object of the present invention is to provide a miniaturized short-distance optical system, which sets up reflective polarization element, phase retardation plate, and partial penetration part of optical elements between the display screen and the optical module, and utilizes the phase delay and multiple reflection of light to reach the optical path with approximate or same length, thereby shortening the distance between the display screen and the optical module, and finally can be used to miniaturize the head-mounted display.
Another object of the present invention is to provide a miniaturized short-distance optical system, which is configured with a single lens on any side of any one of the reflective polarizer, the first phase retarder, the partially transmissive partially reflective element, the second phase retarder and the linearly polarizing plate, so as to achieve the purpose of miniaturization under the premise of adjusting the focal length.
Another object of the utility model is to provide a miniaturized short distance optical system, it can be applied to wide-angle lens or wide-angle eyepiece on wearing products such as display, game machine, only utilizes single lens to carry out the focus and adjusts, can maximize the thickness that makes the device shorten, reach short distance, the visual field is big, have advantages such as good aberration correction.
To achieve the above object, the present invention provides a miniaturized short-distance optical system, including: a display screen for outputting images and emitting polarized or unpolarized light; a reflective polarizing element arranged corresponding to the display screen for partially transmitting and partially reflecting the light; a first phase retarder disposed corresponding to the reflective polarizer for receiving the light partially transmitted through the reflective polarizer and performing a first phase retardation; a partial transmission partial reflection element corresponding to the first phase retardation plate, so that the light beam after the first phase retardation partially penetrates the partial transmission partial reflection element, and partially reflects back to the first phase retardation plate for the second and third phase retardation; at least one optical element, which is arranged corresponding to the partial penetration partial reflection element, receives the light which penetrates the partial penetration partial reflection element and passes through the second and third phase delays, performs the fourth phase delay, and allows the light which passes through the fourth phase delay to pass through but the light which passes through the two phase delays cannot pass through; and a lens, which is arranged on any side of any one element of the reflective polarization element, the first phase retarder, the partial transmission partial reflection element and the optical element so as to adjust the focal length and guide the image into at least one human eye.
According to the utility model discloses an embodiment, this display screen and to between the lens and this lens to this people's eye between can include one to a slice sheet glass more.
According to an embodiment of the present invention, the optical element comprises: a second phase delay plate, which is arranged corresponding to the partial transmission partial reflection element, receives the light which partially penetrates the partial transmission partial reflection element and passes through the second and third time phase delays, and carries out the fourth time phase delay; and a linear polarizer disposed corresponding to the second phase retarder, the linear polarizer being configured to let the light delayed by the second phase retarder not pass through, and let the light delayed by the fourth phase retarder pass through.
According to an embodiment of the present invention, the optical element is a circularly polarizing plate.
According to the embodiment of the present invention, the light reflected back to the first phase retarder by the partially penetrating partially reflective element reaches the reflective polarizer through the first phase retarder after the second phase retardation of the first phase retarder, and the reflection is completed on the reflective polarizer, so that the light is reflected back to the first phase retarder again and the third phase retardation is performed, and then the light passes through the first phase retarder and the partially penetrating partially reflective element to reach the second phase retarder, and the lens can be disposed on any side of any one of the second phase retarder and the linear polarizer.
According to the embodiment of the present invention, the first, second, third and fourth phase delays are increased by the phase delay of 1/4 odd times of the wavelength, so that the light reaching the human eye is delayed by an integral multiple of one wavelength.
According to the embodiment of the present invention, when the light that the display screen sends out and enters the reflective polarizer is polarized light, it can be linearly polarized light, circularly polarized light or other polarization states, and between the display screen and the reflective polarizer, at least one line of polarizer, circular polarizer or phase retarder can be added according to the polarization condition of the display screen to adjust the polarization state of the display screen, and the new material can be a film material or an optical coating film or the like disposed on the display screen or the reflective polarizer in the form of coating, coating or adhesion. The linearly polarized light can be converted into left circularly polarized light or right circularly polarized light after passing through the first phase retarder.
According to the utility model discloses an embodiment, this display screen's visual range radius is H, and this optical system's total length is TTL, and the distance that this eyes reaches this optical system's nearest component surface center is E, and this optical system's half angle of vision is omega, then
And is
And is
According to the utility model discloses an embodiment, this optical system's effective focal length is F, and the radius of curvature that this lens is close to one side of this eye is R1The radius of curvature of the side near the display screen is R2，
Drawings
Fig. 1 is a schematic diagram of an optical path between a display screen of a head-mounted display and a human eye in the prior art.
Fig. 2 is a schematic diagram of an embodiment of the miniaturized short-distance optical system of the present invention.
FIG. 3 is an exploded view of an embodiment of the miniaturized short-range optical system of the present invention
Fig. 4A to 4C are flowcharts illustrating steps of the miniaturized short-distance optical system according to the present invention.
Fig. 5A to 5C are schematic diagrams of different configurations of a single lens in a miniaturized short-distance optical system according to the present invention.
Description of reference numerals: 10-a display screen; 12-a reflective polarizing element; 14-a first phase retarder; 16-partially transmissive partially reflective element; 18 a second phase delay plate; 20-linear polarizer; 22-a lens; 23-an optical module; 24-human eye; 26-plate glass.
Detailed Description
The utility model provides a miniaturized short distance optical system, it is applied to the head-mounted display, especially the virtual reality system of head-mounted display, owing to wear at user's overhead, if the volume is too big, too long then be difficult to fix user's head and can receive the weight influence tenesmus, more can cause the burden to user's head and neck, consequently the size of wearing the display is more and more good for a short time, especially length must shorten, and the utility model discloses a purpose lies in utilizing a plurality of optical element to carry out multiple reflection with light more, more only sets up single lens focus regulation between these optical element, makes whole optical system shorten under the optical path of same length to reach the purpose of wearing the display miniaturization.
Please refer to fig. 2 and fig. 3, which are a schematic diagram and an exploded view of an embodiment of the miniaturized short-distance optical system of the present invention, in the miniaturized short-distance optical system of the present invention, a reflective polarizer 12, a first phase retarder 14, a part of a transmissive partial reflector 16, a second phase retarder 18, a polarizer 20 and a lens 22 are sequentially included between a display screen 10 and at least one human eye 24, wherein the display screen 10 outputs an image and emits light, which is polarized light or unpolarized light, when the light is polarized light, the polarized light may be linearly polarized light, circularly polarized light or other polarization states, in this embodiment, the light is linearly polarized light, and further, the polarization direction of the linearly polarized light in this embodiment is perpendicular to the light path; the reflective polarization component 12 is arranged corresponding to the display screen 10, receives the polarized light emitted by the display screen 10, and partially penetrates and partially reflects the polarized light, in particular, the reflective polarization component 12 adopted by the utility model comprises two polarization directions which are vertical and parallel to the light path, so that the vertical polarized light penetrates and the horizontal polarized light reflects; the first phase retarder 14 is disposed corresponding to the reflective polarizer 12, and is configured to receive the polarized light partially transmitted from the reflective polarizer 12, and perform first, second, and third phase retardations, wherein the polarized light of the first and third phase retardations is directed toward the human eye 24, and the polarized light of the second phase retardation is directed toward the display screen 10; the partially-transmitting partially-reflecting element 16 is disposed corresponding to the first phase retardation plate 14, receives the light passing through the first phase retardation plate 14, partially reflects and partially transmits the light passing through; the second phase retardation plate 18 is disposed corresponding to the partially-transmissive partially-reflective element 16, receives the light partially transmitted through the partially-transmissive partially-reflective element 16, and performs a fourth phase retardation; a linear polarizer 20 is disposed corresponding to the second phase retarder 18, the linear polarizer 20 is configured to let the polarized light with twice phase retardation not pass through and let the polarized light with four times phase retardation pass through, and a lens 22 is disposed on either side of any one of the above-mentioned optical systems to guide the image into the human eye 24.
In the present invention, the single lens 22 can be a convex lens, as shown in fig. 3, the lens 22 can be disposed on any one side of the reflective polarizer 12, the first phase retarder 14, the partially transmissive partially reflective element 16, the second phase retarder 18 and the linearly polarizing plate 20, and is used for adjusting the focal length, regardless of being disposed between any two optical elements, to finally achieve the effect of shortening the optical system, and in the embodiment of fig. 2, the lens 22 is disposed on the left side of the linearly polarizing plate 20 and is close to the human eye 24.
In particular, the retardation axis of the first retarder 14 of the present invention forms an angle of 45 degrees with the penetrating axis of the reflective polarizer 12, which increases the phase retardation of 1/4 wavelengths.
In addition, the lens 22 of the present invention may be an aspheric lens, Fresnel lens (Fresnel lens) or a combination of multiple lenses.
Referring to fig. 4A to 4C, firstly in fig. 4A, the display screen 10 outputs an image and emits polarized light to the reflective polarizer 12, the reflective polarizer 12 makes part of the polarized light penetrate through the first phase retarder 14, and part of the polarized light is reflected back to the display screen 10, and the partially penetrated polarized light penetrating through the reflective polarizer 12 passes through the first phase retarder 14, and then performs a first phase delay and reaches the partially penetrated reflective element 16; referring to fig. 4B, the polarized light after the first time phase retardation partially penetrates through the partially transmissive partially reflective element 16, and a part of the polarized light is reflected back to the first phase retarder 14 for the second time phase retardation, where the polarized light partially penetrating through the partially reflective element 16 is energy loss, and the polarized light after the first time phase retardation penetrates through the first phase retarder 14 and reaches the reflective polarizer 12; referring to fig. 4C again, the reflective polarizer 12 reflects the polarized light with the second phase retardation, reflects the reflected polarized light back to the first phase retarder 14 for the third phase retardation, and then passes through the partially transmissive partial reflector 16, so that the partially transmitted polarized light (with the third phase retardation) reaches the second phase retarder 18 for the fourth phase retardation; the fourth time phase-delayed polarized light is transmitted through the second phase retarder 18, and is screened by the linear polarizer 20, so that only the fourth time phase-delayed polarized light passes through the linear polarizer 20 and is guided by the lens 22 into at least one human eye 24.
Because the first phase retarder 14 and the second phase retarder 18 of the present invention are both odd multiples of the phase retardation of 1/4 wavelengths, they are delayed by an integer multiple of 1 wavelength after four times of phase retardation.
The linearly polarized light is converted into circularly polarized light after passing through the first phase retarder 14, and the circularly polarized light includes left circularly polarized light and right circularly polarized light. However, when part of the circularly polarized light is reflected back to the first retardation plate 14 by the partially transmissive and partially reflective element 16, the circularly polarized light is converted into linearly polarized light again, and then the linearly polarized light is converted into circularly polarized light through the first retardation plate 14, but is converted into linearly polarized light through the second retardation plate 18.
At least one linear polarizer, circular polarizer or phase retarder may be added between the display screen 10 and the reflective polarizer 12 according to the polarization condition of the display screen 10 to adjust the polarization state of the display screen 10, and the added material may be a film material or an optical coating, which is disposed on the display screen 10 or the reflective polarizer 12 in a coating, plating or bonding manner.
The utility model discloses can reach great visual angle, system distance shortens and the effect of good aberration correction, please refer to fig. 2, wherein lens 22 is L, and its effective focal length is F, and optical system's effective focal length is F, and optical system's half angle of vision is omega, and the visual range radius of display screen 10 is H, R1～R2The curvature radii of the left and right surfaces of the lens 22, respectively, the distance from the eye (aperture) to the center of the surface of the nearest element of the optical system is E, and the total length of the optical system is TTL, the following formula can be obtained:
the above formula (3) can achieve good aberration correction, while the formulas (1), (2) and (4) can achieve the advantages of larger viewing angle and shorter system distance (thinner and lighter).
The embodiment of fig. 2 can obtain specific experimental data as the following table one:
watch 1
A, B, C, D, E, etc. in the above table are parameters in the aspheric equation
Wherein C is 1/R, and R is a curvature radius. In the table, f is an effective focal length of the optical system, ω is a half field angle of the optical system, H is a visible range radius of the display screen, f1 is an effective focal length of the lens, Nd is a Refractive index (Refractive index), and Vd is an Abbe number (Abbe number) or a dispersion coefficient (V-number).
The utility model discloses in, reflective polarizing element 12 and partial penetration partial reflection component 16 can be for coating the coating film that the one deck has reflective polarization function on lens 22, or itself has reflective polarization function's lens or pastes on lens 22 for the optical material of film form, therefore, the utility model discloses can be attached reflective polarizing element 12 on first phase retarder 14, attached reflective polarizing element 12 on lens 22, penetrate partial reflection component 16 on first phase retarder 14 with the part, penetrate partial reflection component 16 on second phase retarder 18 with the part, penetrate partial reflection component 16 on lens 22 and so on to produce multiple different embodiment appearance.
In addition to the embodiment of fig. 2, other embodiments of the lens 22 configuration are described below in fig. 5A to 5C, but these embodiments are not intended to limit the configuration method of the lens 22 in the present invention, and the present invention is also within the scope of the present invention as long as the lens 22 is disposed on any one side of at least one of the reflective polarizer 12, the first phase retarder 14, the partially transmissive partially reflective element 16, the second phase retarder 18, and the linearly polarizing plate 20.
In the embodiment shown in fig. 5A, the lens 22 is disposed between the first phase retarder 14 and the partially transmissive partially reflective element 16, and the partially transmissive partially reflective element 16 is disposed on the lens 22. in addition, the present invention can integrate the second phase retarder 18 and the linear polarizer 20, for example, as shown in fig. 5A, the second phase retarder 18 and the linear polarizer 20 are on the same side of the lens 22, which can be equivalent to the function of a circular polarizer, and the second phase retarder 18 and the linear polarizer 20 can be replaced by a circular polarizer. In this embodiment, a flat glass 26 is additionally provided before the polarized light is incident on the human eye 24 for protection. The specific data for this example are given in table two below:
watch two
In another embodiment, shown in FIG. 5B, the reflective polarizer 12 is disposed on the first retarder 14, and the lens 22 is disposed between the first retarder 14 and the partially transmissive partially reflective element 16. similarly to the embodiment of FIG. 5A, the second retarder 18 and the linear polarizer 20 can be replaced by a circular polarizer, and a flat glass 26 is added before the polarized light is incident on the human eye 24. The specific data for this example is as follows table three:
watch III
In the embodiment of fig. 5C, the lens 22 is disposed between the reflective polarizer 12 and the first phase retarder 14, the reflective polarizer 12 of this embodiment is disposed on the right side of the lens 22, and the partially transmissive reflective element 16 can be disposed on the left side of the first phase retarder 14 or on the right side of the second phase retarder 18, similar to the embodiment of fig. 5A, the second phase retarder 18 and the linear polarizer 20 can be replaced by a circular polarizer, and a flat glass 26 is added before the polarized light is incident on the human eye 24. The specific data for this example is given in table four below:
watch four
The utility model utilizes the polarization principle to make internal refraction and reflection of the light path in the optical system to achieve the effect of shortening the length of the optical system, as shown in the embodiments of fig. 2 and 5A to 5C, the optical path of the optical module (not shown) from the display screen 10 to the front of the human eye 24 in the figure is reflected for a plurality of times, assuming that the optical path of the light from the display screen 10 to the optical module after the length of each reflection is summed up is d, which is almost the same as the optical path d from the display screen 10 to the optical module 23 in the prior art of fig. 1, but because in the embodiments of fig. 2 and 5A to 5C, the optical path of the optical module from the display screen 10 to the front of the human eye 24 after the polarized light is emitted from the display screen 10 is summed up through a plurality of reflections, the length from the display screen 10 to the optical module is far shorter than the length from the display screen 10 to the optical module 23 in fig. 1, the purpose of shortening the length of the optical system is achieved.
The fifth table below is the calculation results of the embodiments of fig. 2 and fig. 5A to 5C nested in the above equations (1) to (4).
Watch five
To sum up, the utility model provides a miniaturized short distance optical system puts a plurality of optical element according to the preface behind the display screen, before the optical module, utilizes light multiple reflection to reach the purpose that optical system's length shortened, and utilizes the phase delay piece to carry out quartic phase delay, makes the polarization state of polarized light arrive optical module at last with the integral multiple of the polarization state phase delay a wavelength of beginning from the display screen transmission. The utility model discloses the design that more utilizes single lens reaches the miniaturized purpose of short distance, and still can keep good aberration to rectify, is applicable to wide-angle camera lens or wide-angle eyepiece, and the visual angle can reach more than 50 degrees.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. Therefore, all equivalent changes or modifications of the features and spirit of the present invention, which are described in the claims, should be included in the scope of the present invention.
Claims (13)
1. A miniaturized short-range optical system, comprising:
a display screen for outputting images and emitting polarized or unpolarized light;
a reflective polarizing element arranged corresponding to the display screen for partially transmitting and partially reflecting the light;
a first phase retarder disposed corresponding to the reflective polarizer for receiving the light partially transmitted through the reflective polarizer and performing a first phase retardation;
a partial transmission partial reflection element corresponding to the first phase retardation plate, so that the light beam after the first time phase retardation partially penetrates the partial transmission partial reflection element, and partially reflects back to the first phase retardation plate for the second time and third time phase retardation;
at least one optical element, which is arranged corresponding to the partial penetration partial reflection element, receives the light which penetrates the partial penetration partial reflection element and passes through the second and third phase delays, performs the fourth phase delay, and allows the light which passes through the fourth phase delay to pass through but the light which passes through the two phase delays cannot pass through; and
and the lens is arranged on any side of any one of the reflective polarizing element, the first phase retarder, the partially-transmitting partially-reflecting element and the optical element and guides the image output by the display screen into at least one human eye.
2. The miniaturized short-distance optical system of claim 1, wherein one to many sheets of plate glass are disposed between the human eye and the lens, and one to many sheets of plate glass are disposed between the lens and the display screen, and one to many optical elements are disposed on the plate glass, and the optical elements are made of thin film material or optical coating and are disposed on the plate glass in a coating, coating or bonding manner.
3. A miniaturized short-range optical system as claimed in claim 1, characterized in that the optical element comprises:
a second phase delay plate, which is arranged corresponding to the partial transmission partial reflection element, receives the light which partially penetrates the partial transmission partial reflection element and passes through the second and third time phase delays, and carries out the fourth time phase delay; and
and a linear polarizer disposed corresponding to the second phase retarder, the linear polarizer being configured to let the light delayed by the second phase retarder not pass through, and let the light delayed by the fourth phase retarder pass through.
4. A miniaturized short-range optical system as claimed in claim 1, characterized in that the optical element is a circular polarizer.
5. A miniaturized short-distance optical system as claimed in claim 3, wherein the light reflected back to the first phase retarder by the partially transmissive partially reflective element passes through the first phase retarder after the second phase retardation by the first phase retarder to reach the reflective polarizer and is reflected by the reflective polarizer to be reflected back to the first phase retarder again for the third phase retardation, and then passes through the first phase retarder and the partially transmissive partially reflective element to reach the second phase retarder, and the lens is disposed on either side of the second phase retarder and the linear polarizer.
6. A miniaturized short-range optical system as in claim 3 wherein the first, second, third and fourth retardations are each increased by a phase retardation which is an odd multiple of 1/4 wavelengths such that the light reaching the human eye is retarded by an integer multiple of one wavelength.
7. The miniaturized short-distance optical system of claim 1, wherein the light transmitted from the display panel and entering the reflective polarizer is linearly polarized light or circularly polarized light, and one or more linear polarizers, circular polarizers or phase retarders are added between the display panel and the reflective polarizer according to the polarization of the display panel to adjust the polarization state of the display panel, and the linear polarizers, circular polarizers or phase retarders are thin film materials or optically coated films and are disposed on the display panel or the reflective polarizer in a coating, film coating or bonding manner.
8. A miniaturized short-distance optical system according to claim 7, wherein the linearly polarized light is converted into left circularly polarized light or right circularly polarized light after passing through the first phase retarder.
9. A miniaturized short-range optical system as claimed in claim 1, characterized in that the radius of the visible range of the display screen is H, the total length of the optical system is TTL,
10. the miniaturized short-distance optical system of claim 1 or 9, wherein the display screen has a radius of a visible range of H, the optical system has an overall length of TTL, the distance from the eye to the center of the surface of the nearest element of the optical system is E,
11. a miniaturized short-range optical system as claimed in claim 1, characterized in that the effective focal length of the optical system is F and the radius of curvature of the side of the lens which is closer to the eye is R1The radius of curvature of the side near the display screen is R2，
12. The miniaturized short-range optical system of claim 1, wherein the effective focal length of the optical system is F, the half field angle of the optical system is ω, the total length of the optical system is TTL,
13. a miniaturized short-range optical system as claimed in claim 1, characterized in that the lens is an aspherical lens, a fresnel lens or a combination of multiple lenses.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112505920A (en) * | 2019-09-16 | 2021-03-16 | 双莹科技股份有限公司 | Miniaturized short-distance optical system |
| CN112558287A (en) * | 2020-12-30 | 2021-03-26 | 深圳纳德光学有限公司 | Catadioptric eyepiece optical system and head-mounted display device |
| CN112711139A (en) * | 2021-01-04 | 2021-04-27 | 业成科技（成都）有限公司 | Near-to-eye display device and optical system thereof |
| WO2022033233A1 (en) * | 2020-08-13 | 2022-02-17 | 京东方科技集团股份有限公司 | Near-to-eye display apparatus |
| CN115185081A (en) * | 2022-06-29 | 2022-10-14 | 北京理工大学 | Near-to-eye display equipment based on short-focus catadioptric projection system and corneal contact lens thereof |
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2019
- 2019-09-16 CN CN201921535245.9U patent/CN210776039U/en active Active
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112505920A (en) * | 2019-09-16 | 2021-03-16 | 双莹科技股份有限公司 | Miniaturized short-distance optical system |
| WO2022033233A1 (en) * | 2020-08-13 | 2022-02-17 | 京东方科技集团股份有限公司 | Near-to-eye display apparatus |
| CN112558287A (en) * | 2020-12-30 | 2021-03-26 | 深圳纳德光学有限公司 | Catadioptric eyepiece optical system and head-mounted display device |
| CN112558287B (en) * | 2020-12-30 | 2024-06-04 | 深圳纳德光学有限公司 | Catadioptric eyepiece optical system and head-mounted display device |
| CN112711139A (en) * | 2021-01-04 | 2021-04-27 | 业成科技（成都）有限公司 | Near-to-eye display device and optical system thereof |
| CN112711139B (en) * | 2021-01-04 | 2023-04-11 | 业成科技（成都）有限公司 | Near-to-eye display device and optical system thereof |
| CN115185081A (en) * | 2022-06-29 | 2022-10-14 | 北京理工大学 | Near-to-eye display equipment based on short-focus catadioptric projection system and corneal contact lens thereof |
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