CN208188482U - A kind of close-coupled AR display device - Google Patents
A kind of close-coupled AR display device Download PDFInfo
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- CN208188482U CN208188482U CN201820839340.7U CN201820839340U CN208188482U CN 208188482 U CN208188482 U CN 208188482U CN 201820839340 U CN201820839340 U CN 201820839340U CN 208188482 U CN208188482 U CN 208188482U
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Abstract
The utility model relates to a kind of close-coupled AR display devices, comprising: OLED micro display screen, low index prisms, high refractive index polarization splitting prism, quarter-wave plate and the reflective lens set gradually along first axle；High refractive index polarization splitting prism includes the first incidence surface, the second incidence surface, the first light-emitting surface, the second light-emitting surface and light splitting surface；The virtual image light of OLED micro display screen is after low index prisms, enter high refractive index polarization splitting prism from the first incidence surface, wherein P-polarized light passes through the first light-emitting surface after light splitting surface, P-polarized light passes through quarter-wave plate and reflects through reflective lens, across quarter-wave plate at S polarized light, with the environment actinic light from the incidence of the second incidence surface, human eye is transmitted through by the second light-emitting surface.The utility model provides a kind of integrated, compact-sized AR display device, and each element cooperates, and light loss is small, and brightness is high, and good imaging quality, processing request is low, easily assembles, easy volume production.
Description
Technical field
The utility model relates to AR technical field more particularly to a kind of close-coupled AR display devices.
Background technique
Augmented reality (Augmented Reality, abbreviation AR) is a kind of position for calculating camera image in real time
Set and angle and plus respective image, video, 3D model technology.The target of this technology is virtual information to be added to really
In the scene in the world, not only retain the information of real world, but also virtual information is shown simultaneously, two kinds of information are mutual
Supplement realizes that real world information and virtual world information are " seamless " integrated.
For guarantee user it can be seen that the scene image of virtual image and real world after aliasing, AR technology needs are used
Imaging technique and light splitting light combination technology, such as using the helmet, it is packed into lens type AR display device in the helmet, real world
It is synthesized together again with computer graphic.
Current lens type AR display device usually in the presence of constitute optical path element it is complicated, it is oversized, be difficult to volume production with
And the defects of fogging image.For example, being existed at present using the AR display device of OLED micro display screen since optical path light efficiency is low
When use the problem of pleasing to the eye luminance shortage.
Utility model content
(1) technical problems to be solved
The technical problems to be solved in the utility model is to solve existing prism AR display device there are sizes big, and element is multiple
The problem of miscellaneous hardly possible volume production, and light efficiency is low, luminance shortage when use, fogging image.
(2) technical solution
In order to solve the above-mentioned technical problem, the utility model provides a kind of close-coupled AR display device, comprising:
OLED micro display screen, low index prisms, the high refractive index polarization splitting prism, four points set gradually along first axle
One of wave plate and reflective lens；
The low index prisms have the incidence surface that is bonded with the OLED micro display screen, and with the incidence surface phase
Pair light-emitting surface；
The high refractive index polarization splitting prism includes the light out of the first incidence surface, the second incidence surface, the first light-emitting surface, second
Face and light splitting surface；First incidence surface is bonded with the light-emitting surface of the low index prisms, and the optical axis coincidence of the two, described
First light-emitting surface is opposite with first incidence surface；The optical axis of the optical axis of second incidence surface and first incidence surface hangs down
Directly, and second incidence surface is opposite with second light-emitting surface；
The reflective lens have plane incidence surface and curved-surface reflection side；The side of the quarter-wave plate with it is described
First light-emitting surface of high refractive index polarization splitting prism is bonded, and the other side is bonded with the plane incidence surface of the reflective lens；
The virtual image light of the OLED micro display screen enters after the low index prisms from first incidence surface
The high refractive index polarization splitting prism, wherein P-polarized light passes through the first light-emitting surface after the light splitting surface, and P-polarized light passes through
Reflect, again pass through after quarter-wave plate into S polarized light through the reflective lens after quarter-wave plate, S polarized light with
Human eye is transmitted through by the second light-emitting surface after the environment actinic light of the second incidence surface incidence.
Preferably, the refractive index of the high refractive index polarization splitting prism is higher than the refractive index of the low index prisms,
The refractive index of the low index prisms is 1.5~1.7, the refractive index of the high refractive index polarization splitting prism is 1.7~
1.9。
Preferably, the refractive index of the low index prisms is 1.5, the refractive index of the high refractive index polarization splitting prism
It is 1.8.
Preferably, the high refractive index polarization splitting prism is made using H-K9L glass material in the low index prisms
It is made of H-ZF52A glass material.
Preferably, the low index prisms and high refractive index polarization splitting prism are rectangular parallelepiped structure, and described low
Index prism, high refractive index polarization splitting prism, quarter-wave plate are equal perpendicular to the section of the first axle.
Preferably, the high refractive index polarization splitting prism includes the first prism and the second prism being arranged successively, institute
Stating the first prism and the second prism is triangular prism structure；
The slant edge face of the slant edge face of first prism and second prism is glued, and cemented surface be coated with polarizing diaphragm with
Form the light splitting surface of the high refractive index polarization splitting prism；
First prism is close to the low index prisms, and the face vertical with the first axle enters light for described first
Face, the optical axis face vertical with the first axle are second light-emitting surface；
Second prism is close to the quarter-wave plate, and the face vertical with the first axle goes out light for described first
Face, the optical axis face vertical with the first axle are second incidence surface.
Preferably, the low index prisms with a thickness of 12.59mm, the thickness of the high refractive index polarization splitting prism
For 12mm.
Preferably, the radius of curvature of the reflective lens curved-surface reflection side is 52.06mm.
Preferably, the low index prisms, the high refractive index polarization splitting prism, the quarter-wave plate and institute
The height for stating reflective lens is 10mm, and width is 12mm.
Preferably, the distance of exit pupil of the close-coupled AR display device is 18mm.
(3) beneficial effect
The above-mentioned technical proposal of the utility model has the advantages that the utility model provides a kind of integrated, structure
Compact AR display device uses polarizing diaphragm for being divided in the high refractive index polarization splitting prism of light combination, and each element
It cooperates, light loss is small, improves light efficiency, solves that will cause image source brightness using OLED micro display screen low, visual
The drawback of difference, brightness is high, may be adapted to various application scenarios.And the display device greatly reduces existing AR display dress
Size is set, and the requirement to processing is lower, easily assembled, easy volume production, and product yield is high.There is image quality height simultaneously, it is abnormal
Become smaller, the advantage of image quality exquisiteness can be used as a kind of widely used AR display device.
Detailed description of the invention
Fig. 1 is close-coupled AR display device structure schematic diagram in the utility model embodiment；
Fig. 2 is the virtual image light propagation schematic diagram of close-coupled AR display device in the utility model embodiment；
Fig. 3 is different brightness position distribution schematic diagrames in the utility model embodiment；
Fig. 4 is close-coupled AR display device image deformation figure in the utility model embodiment；
Fig. 5 is close-coupled AR display device image field diagram in the utility model embodiment.
In figure: 1:OLED micro display screen；2: low index prisms；3: high refractive index polarization splitting prism；4: a quarter
Wave plate；5: reflective lens.
Specific embodiment
It is practical new below in conjunction with this to keep the objectives, technical solutions, and advantages of the embodiments of the present invention clearer
Attached drawing in type embodiment, the technical scheme in the utility model embodiment is clearly and completely described, it is clear that is retouched
The embodiment stated is a part of the embodiment of the utility model, instead of all the embodiments.Based on the reality in the utility model
Apply example, those of ordinary skill in the art's every other embodiment obtained without making creative work, all
Belong to the range of the utility model protection.
As shown in Figure 1 to Figure 3, a kind of close-coupled AR display device provided by the embodiment of the utility model, comprising: along first
OLED micro display screen 1 that axis is set gradually, low index prisms 2, high refractive index polarization splitting prism 3,4 and of quarter-wave plate
Reflective lens 5.Wherein:
Low index prisms 2 have the incidence surface that be bonded with OLED micro display screen 1, and it is opposite with the incidence surface out
Smooth surface.The incidence surface and light-emitting surface of low index prisms 2 are vertical with first axle.
High refractive index polarization splitting prism 3 includes the first incidence surface, the second incidence surface, the first light-emitting surface, the second light-emitting surface
And light splitting surface.Wherein, the first incidence surface is bonded with the light-emitting surface of low index prisms 2, and the optical axis of the first incidence surface and low folding
Penetrate the optical axis coincidence of 2 light-emitting surface of rate prism.First light-emitting surface is opposite with the first incidence surface.The optical axis of second incidence surface enters with first
The optical axis of smooth surface is vertical, and the second incidence surface is opposite with the second light-emitting surface.
Reflective lens 5 have plane incidence surface and curved-surface reflection side, and the side of quarter-wave plate 4 and high refractive index are inclined
The first light-emitting surface fitting of vibration Amici prism 3, the other side is bonded with the plane incidence surface of reflective lens 5.
As shown in Figures 2 and 3, the virtual image light that OLED micro display screen 1 issues is after low index prisms 2, from the
One incidence surface enters high refractive index polarization splitting prism 3, and after the light splitting surface of high refractive index polarization splitting prism 3, P therein is inclined
The light that shakes passes through the first light-emitting surface and reflects through reflective lens 5 after P-polarized light passes through quarter-wave plate 4, again pass through four points
One of after wave plate 4 at S polarized light, S polarized light with after the environment actinic light of the second incidence surface incidence, by the transmission of the second light-emitting surface
To human eye.Direction shown in arrow is the observed direction of user in Fig. 1, and circle indicates S polarized light in Fig. 3, and horizontal line indicates P polarization
Light, circle add horizontal line to indicate natural light.
Preferably, as shown in Figure 1 to Figure 3, high refractive index polarization splitting prism 3 include the first prism for being arranged successively and
Second prism, the first prism and the second prism are triangular prism structure.Wherein:
The slant edge face of first prism and the slant edge face of the second prism are glued, and cemented surface is coated with polarizing diaphragm to form high folding
Penetrate the light splitting surface of rate polarization splitting prism.
First prism is close to low index prisms, and the face vertical with first axle is the first incidence surface, optical axis and first axle
Vertical face is the second light-emitting surface.
Second prism is close to quarter-wave plate, and the face vertical with first axle is the first light-emitting surface, optical axis and first axle
Vertical face is the second incidence surface.
The light splitting surface of high refractive index polarization splitting prism 3 is unconventional semi-transparent using polarizing diaphragm in the utility model
Half anti-diaphragm, can effectively improve light efficiency.
Light splitting is realized using semi-transparent semi-reflecting film in traditional lens type AR display device, and image light is transmitted through half first
Saturating half anti-film after catoptric imaging, again passes by semi-transparent semi-reflecting film and reflects into pleasing to the eye, need to pass twice through semi-transparent semi-reflecting film, light in total
Low efficiency.If semi-transparent semi-reflecting film transmitance is T, reflectivity R, ideally, if the light at the image source of virtual image is logical
Amount is I, then enters the light efficiency of human eye are as follows:
And T+R=1.
It is found that when using traditional semi-transparent semi-reflecting film, T=R=50%, light efficiency η≤25%.
And for the polarizing diaphragm used in the utility model, transmitance T=50%, reflectivity R=1 are ideal
In the case where, when using polarizing diaphragm, light efficiency 50%, hence it is evident that better than traditional semi-transparent semi-reflecting film.
It is maximum using OLED micro display screen the disadvantage is that brightness is not high enough at present in AR industry, therefore it is usually necessary to use
LCoS micro display screen, the illumination optical engine of additional LED light, its structure is complicated, and element is more, and integration degree is low, and LCoS
Installation site must be accurate, and required precision is higher, and technique is difficult to control, causes AR optics display engine at high cost, yields,
The problems such as complex procedures, and the occasion applied is restricted.And the utility model is by improving each element and each element
Between mutual cooperation, can effectively improve light efficiency, also can reach pleasing to the eye high brightness using OLED micro display screen.Also, this
Utility model can further use sony company 2000nit and highlight OLED micro display screen, and the pleasing to the eye brightness of user can reach
500-1000nit, can satisfy the demand of various AR application scenarios, and image quality is clearly fine and smooth.As shown in figure 3, ideally, when
The virtual image brightness that the position P1 OLED micro display screen provides is 2000nit, and the light of the position P2 does not pass through high refractive index polarization
The light splitting surface of Amici prism, the brightness of the position P2 is up to 2000nit, and the light of the position P3 passes through light splitting surface, and polarizing diaphragm penetrates
Up to 1000nit, human eye is reachable in the theoretical brightness that the position P4 is observed to be rate T=50%, P3 position brightness
1000nit。
It should be noted that the low index prisms, high refractive index polarization splitting prism in the utility model are for convenience of table
The title stated, low index prisms can also be called first refractive index prism, and high refractive index polarization splitting prism can also be called
Second index prism, the refractive index of first refractive index prism are lower than the refractive index of the second index prism.
It can be improved image quality (resolution ratio for improving display) using low index prisms 2, it is preferable that be so that the AR
Display device reaches better imaging effect, and the refractive index of low index prisms 2 is 1.5~1.7, preferably 1.5, high refractive index
The refractive index of polarization splitting prism 3 is 1.7~1.9, preferably 1.8.It is further preferred that H- can be used in low index prisms 2
K9L glass material is made, and high refractive index polarization splitting prism 3 can be used H-ZF52A glass material and be made.
To realize better imaging effect, it is ensured that all elements can cooperate well, it is preferable that low-refraction
Prism 2 with a thickness of 12.59mm, i.e., the distance between incidence surface Yu light-emitting surface of low index prisms 2 are 12.59mm, height folding
Penetrate rate polarization splitting prism 3 with a thickness of 12mm, i.e. the first incidence surface and the first light-emitting surface of high refractive index polarization splitting prism 3
The distance between be 12mm.Thickness herein refers to the distance that each element is occupied along first axle.
To make close-coupled AR display device compact overall structure, facilitates processing and encapsulation, improve yields, preferably
Ground, low index prisms 2 and high refractive index polarization splitting prism 3 are rectangular parallelepiped structure, and low index prisms 2, height reflect
Rate polarization splitting prism 3, quarter-wave plate 4 are equal perpendicular to the section of first axle, and are equal to the plane of reflective lens 5
Incidence surface.
It is further preferred that low index prisms 2, high refractive index polarization splitting prism 3, quarter-wave plate 4 and reflection
The height of formula lens 5 is 10mm, and width is 12mm.The radius of curvature of 5 curved-surface reflection side of reflective lens is 52.06mm.
When encapsulation, the distance of exit pupil of close-coupled AR display device is 18mm, when the eye distance high refractive index polarization splitting prism 3 of user
When the distance of second light-emitting surface is 18mm, best user experience can be obtained.
Illustrate for aspect, the parameters in a preferred embodiment are given below, this group of parameter is to utilize software optimization
Optimal result, as shown in the table.
1 each face parameter of close-coupled AR display device of table
Note: " STOP " indicates emergent pupil face in upper table, and " Infinity " indicates infinitely great, i.e., its corresponding surface is plane,
" STANDARD " indicates that index plane, " COORDBRK " indicates coordinate breakpoint face, " IMA " indicate image planes, and " MIRROR " indicates reflection
Face, " thickness (interval) " indicate the interval of two optical surfaces；" H-ZF52A ", " H-K9L ", " H-K10 ", " PC " indicate material,
Wherein " H-ZF52A " is the glass material of high refractive index polarization splitting prism, and " H-K9L " is the glass material of low index prisms
Matter, " H-K10 " are the glass material of the backplate glass of OLED micro display screen, and " PC " is the optical material material of quarter-wave plate
Matter.
In upper table, No. 1 face is at user's observation, and No. 2 faces are the second light-emitting surface of high refractive index polarization splitting prism, No. 3
Face is secondary surface, and No. 4 faces are the light splitting surface of high refractive index polarization splitting prism, and No. 5 faces are secondary surface, since light has mistake twice
Quarter-wave plate, when No. 6 faces are that virtual image light passes through quarter-wave plate for the second time, quarter-wave plate and high refractive index
The face of polarization splitting prism fitting, No. 7 faces are the plane incidence surface of reflective lens, and No. 8 faces are secondary surface, and No. 9 faces are reflection
The curved-surface reflection side of formula lens, No. 10 faces are secondary surface, cross quarter-wave plate twice since light has, No. 11 faces are virtual graph
When passing through quarter-wave plate for the first time as light, the face that quarter-wave plate is bonded with reflective lens, No. 12 faces are high refraction
First light-emitting surface of rate polarization splitting prism, No. 13 faces are the light-emitting surface of low index prisms, and No. 14 faces are low index prisms
Incidence surface, No. 15 faces are the light-emitting surface of the backplate glass of OLED micro display screen, and No. 16 faces are the image planes of OLED micro display screen.
The image quality of close-coupled AR display device is tested in the utility model, close-coupled AR display dress
The imaging standards set are better than other nearly eye displaying schemes up to 111lp/mm@MTF=0.1, imaging standards MTF.Also, it is imaged
Distortion as shown in figure 4, in Fig. 4 ordinate be visual field/°, abscissa is distortion percentage, and 10.03 ° of angle of half field-of view, curve indicates
Distortion, distortion < 2%.The curvature of field as shown in figure 5, in Fig. 5 ordinate be visual field/°, abscissa be defocus/mm, angle of half field-of view
10.03 °, six curves are divided into three groups of G1, G2 and G3 in Fig. 5, and every group includes a solid line and a dotted line, from left to right, G1,
G2 and G3 is followed successively by the light of different wave length, and wavelength is respectively 656nm, 587nm and 486nm, wherein solid line indicates meridian direction
Light, dotted line indicate the light in sagitta of arc direction.
Close-coupled AR display device provided by the utility model is encapsulated into the users such as the helmet and wears structure, in use, adjusting
Behind whole position, virtual image light is issued using OLED micro display screen, virtual image light is inclined through low index prisms, high refractive index
Shake Amici prism, quarter-wave plate and reflective lens back reflection, and again passing by quarter-wave plate, to enter high refractive index inclined
Shake Amici prism, realizes and retains very into the eyes of user with external environment actinic light in high refractive index polarization splitting prism
While the information in the real world, virtual information is shown.
Finally, it should be noted that above embodiments are only to illustrate the technical solution of the utility model, rather than its limitations；
Although the utility model is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that:
It is still possible to modify the technical solutions described in the foregoing embodiments, or part of technical characteristic is carried out etc.
With replacement；And these are modified or replaceed, various embodiments of the utility model technology that it does not separate the essence of the corresponding technical solution
The spirit and scope of scheme.
Claims (10)
1. a kind of close-coupled AR display device characterized by comprising
OLED micro display screen, low index prisms, the high refractive index polarization splitting prism, a quarter set gradually along first axle
Wave plate and reflective lens；
The low index prisms have the incidence surface being bonded with the OLED micro display screen, and opposite with the incidence surface
Light-emitting surface；
The high refractive index polarization splitting prism include the first incidence surface, the second incidence surface, the first light-emitting surface, the second light-emitting surface and
Light splitting surface；First incidence surface is bonded with the light-emitting surface of the low index prisms, and the optical axis coincidence of the two, and described first
Light-emitting surface is opposite with first incidence surface；The optical axis of second incidence surface is vertical with the optical axis of first incidence surface, and
Second incidence surface is opposite with second light-emitting surface；
The reflective lens have plane incidence surface and curved-surface reflection side；The side of the quarter-wave plate and the high folding
The first light-emitting surface fitting of rate polarization splitting prism is penetrated, the other side is bonded with the plane incidence surface of the reflective lens；
The virtual image light of the OLED micro display screen is after the low index prisms, described in first incidence surface entrance
High refractive index polarization splitting prism, wherein P-polarized light passes through the first light-emitting surface after the light splitting surface, and P-polarized light passes through four points
One of reflected through the reflective lens after wave plate, again pass through after quarter-wave plate into S polarized light, S polarized light with from the
Human eye is transmitted through by the second light-emitting surface after the environment actinic light of two incidence surfaces incidence.
2. close-coupled AR display device according to claim 1, it is characterised in that: the high refractive index polarization splitting prism
Refractive index be higher than the refractive index of the low index prisms, the refractive index of the low index prisms is 1.5~1.7, described
The refractive index of high refractive index polarization splitting prism is 1.7~1.9.
3. close-coupled AR display device according to claim 2, it is characterised in that: the refractive index of the low index prisms
It is 1.5, the refractive index of the high refractive index polarization splitting prism is 1.8.
4. close-coupled AR display device according to claim 2, it is characterised in that: the low index prisms use H-
K9L glass material is made, and the high refractive index polarization splitting prism is made of H-ZF52A glass material.
5. close-coupled AR display device according to claim 1, it is characterised in that: the low index prisms and high refraction
Rate polarization splitting prism is rectangular parallelepiped structure, and the low index prisms, high refractive index polarization splitting prism, a quarter
Wave plate is equal perpendicular to the section of the first axle.
6. close-coupled AR display device according to claim 1, it is characterised in that: the high refractive index polarization splitting prism
Including the first prism and the second prism being arranged successively, first prism and the second prism are triangular prism structure；
The slant edge face of first prism and the slant edge face of second prism are glued, and cemented surface is coated with polarizing diaphragm to be formed
The light splitting surface of the high refractive index polarization splitting prism；
First prism is close to the low index prisms, and the face vertical with the first axle is first incidence surface,
The optical axis face vertical with the first axle is second light-emitting surface；
Second prism is close to the quarter-wave plate, and the face vertical with the first axle is first light-emitting surface,
The optical axis face vertical with the first axle is second incidence surface.
7. close-coupled AR display device according to claim 6, it is characterised in that: the low index prisms with a thickness of
12.59mm, the high refractive index polarization splitting prism with a thickness of 12mm.
8. close-coupled AR display device according to claim 7, it is characterised in that: the reflective lens curved-surface reflection side
Radius of curvature be 52.06mm.
9. close-coupled AR display device according to claim 8, it is characterised in that: the low index prisms, the height
The height of refractive index polarization splitting prism, the quarter-wave plate and the reflective lens is 10mm, and width is
12mm。
10. close-coupled AR display device according to claim 9, it is characterised in that: the close-coupled AR display device
Distance of exit pupil is 18mm.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109387947A (en) * | 2018-12-12 | 2019-02-26 | 深圳珑璟光电技术有限公司 | A kind of nearly eye optimization display device of 3D and method |
| CN110031978A (en) * | 2019-05-28 | 2019-07-19 | 深圳市思坦科技有限公司 | A kind of nearly eye display device |
| CN110088665A (en) * | 2019-03-13 | 2019-08-02 | 香港应用科技研究院有限公司 | Compact optical structure for big visual field optical perspective type head-mounted display designs |
| WO2020181564A1 (en) * | 2019-03-13 | 2020-09-17 | Hong Kong Applied Science and Technology Research Institute Company Limited | Compact optical structure design for large field of view optical see through head mounted display |
| CN112147783A (en) * | 2020-09-28 | 2020-12-29 | 维沃移动通信有限公司 | Wearable device |
| CN112346252A (en) * | 2020-11-09 | 2021-02-09 | 京东方科技集团股份有限公司 | Near-to-eye display device |
| CN112415753A (en) * | 2020-12-14 | 2021-02-26 | 北京灵犀微光科技有限公司 | Near-to-eye display device and preparation method |
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2018
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109387947A (en) * | 2018-12-12 | 2019-02-26 | 深圳珑璟光电技术有限公司 | A kind of nearly eye optimization display device of 3D and method |
| WO2020119003A1 (en) * | 2018-12-12 | 2020-06-18 | 深圳珑璟光电技术有限公司 | 3d near-eye optimization display apparatus and method |
| CN110088665A (en) * | 2019-03-13 | 2019-08-02 | 香港应用科技研究院有限公司 | Compact optical structure for big visual field optical perspective type head-mounted display designs |
| WO2020181564A1 (en) * | 2019-03-13 | 2020-09-17 | Hong Kong Applied Science and Technology Research Institute Company Limited | Compact optical structure design for large field of view optical see through head mounted display |
| US11435584B2 (en) | 2019-03-13 | 2022-09-06 | Hong Kong Applied Science And Technology Research Institute Co., Ltd. | Large field of view see through head mounted display having magnified curved intermediate image |
| CN110031978A (en) * | 2019-05-28 | 2019-07-19 | 深圳市思坦科技有限公司 | A kind of nearly eye display device |
| CN112147783A (en) * | 2020-09-28 | 2020-12-29 | 维沃移动通信有限公司 | Wearable device |
| CN112346252A (en) * | 2020-11-09 | 2021-02-09 | 京东方科技集团股份有限公司 | Near-to-eye display device |
| CN112415753A (en) * | 2020-12-14 | 2021-02-26 | 北京灵犀微光科技有限公司 | Near-to-eye display device and preparation method |
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