CN202433602U - Optical system using holographic element and head mounted display having the optical system - Google Patents
Optical system using holographic element and head mounted display having the optical system Download PDFInfo
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- CN202433602U CN202433602U CN201120511434XU CN201120511434U CN202433602U CN 202433602 U CN202433602 U CN 202433602U CN 201120511434X U CN201120511434X U CN 201120511434XU CN 201120511434 U CN201120511434 U CN 201120511434U CN 202433602 U CN202433602 U CN 202433602U
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Abstract
The utility model provides an optical system using a holographic element. The optical system comprises a microdisplay and an optical combiner, the microdisplay and a glued lens are glued to be a whole, the optical combiner comprises two right-angle prisms which have 45 degree angles, a holographic optical element and a narrow-band high-reflectivity optical surface. The two right-angle prisms having 45 degree angles are closely adhered together, the holographic optical element and the right-angle prism are glued to be a whole, the holographic optical element is located on one surface of the optical combiner which is close to the glued lens, the narrow-band high-reflectivity optical surface is located at a joint of the two right-angle prisms, and forms 45 degree angles both with a horizontal optical axis and a vertical optical axis. The utility model also provides a head mounted display having the abovementioned optical system. The utility model has the advantages of a compact system, convenient correction, good aberration correction and high reliability.
Description
Technical field
The utility model belongs to the optical design field, relates to a kind of optical system of Helmet Mounted Display, particularly uses the Helmet Mounted Display of holographic element.
Technical background
(HMD HeadMountedDisplay) is divided into half throwing type and full throwing type to Helmet Mounted Display, is a kind of emerging airborne demonstration/sighting system.The image that it can be produced the small two-dimension display becomes the virtual image in human eye the place ahead via optical system.Particularly, light that the small two-dimension display is launched makes image produce similar distant place effect because of refraction or diffraction through lens combination, utilizes this effect that near objects is amplified to and observes at a distance or aiming and reach so-called full figure vision.
Nineteen sixty-eight in the world first Helmet Mounted Display truly be the military helmet display, i.e. " sword of Damocles " Helmet Mounted Display of U.S. ARPA Information Processing Technology Office director Ivan Sutherland exploitation.Originally being mainly opportunity of combat and battlebus driver is equipped with; And now; No matter be that fighter plane, helicopter or the helmet that the individual soldier wore singly are not protective devices; The science and technology of develop rapidly condense upon multiple function in the helmet, make it become the competent assistant who helps user's operating aircraft, aims at, obtains equipment such as cartographic information, the important tie between the person of being to use and its weapon, the base.In addition, the status of civilian Helmet Mounted Display in the virtual technology application system is also very important.
Because Helmet Mounted Display is fixed on the helmet, Helmet Mounted Display key for design point is under the situation that satisfies each item optical property, and the volume of system is as far as possible little, compact conformation, weight are little.In military field, no matter be pilot or individual soldier especially, the small increase of the volume or weight of helmet-mounted display system can both bring great inconvenience to the user.
Holographic optical elements (HOE) (Holographic Optical Element, HOE) be a kind of diffraction optical element (Diffractive Optical Element, DOE).The chromatic dispersion of diffraction imaging optical element has negative tropism, and irrelevant with material, and this is very beneficial for achromatism, can same refracting element.Diffraction optical element is as a kind of imaging optic element; The arbitrary phase distribution that is possessed, especial dispersion, flattened field and slim component properties have determined its status and effect in imaging optical system. roll over/spread out hybrid imaging system and made full use of conventional geometric optical element and diffraction optical element advantage separately; Can effectively simplify optical system structure; Weight reduction; Reduced volume with improve image quality, realize the inaccessiable target of many traditional image opticss, be major transformation to traditional image optics. the advantage of rolling over/spreading out hybrid imaging system at first is applied it in the hi-tech optical imaging system in military affairs, space industry.
A kind of optical system of Helmet Mounted Display has been proposed at patent documentation CN200510008494.9 (open day is on September 7th, 2005); Like Fig. 2; Positive lens of its usefulness 42, a micro-display 41 and an optical elements sets 43 are formed optical systems, turn back through 44 pairs of light of semi-transparent semi-reflecting optical surface.Because the distance between positive lens 42 and micro-display 41, the optical elements sets 43 is less, this brings some troubles for actual installation and debugging, reduces its reliability.In addition, owing to use semi-transparent semi-reflecting optical surface 44, do not considering that the luminous energy that micro-display 41 reaches human eye 46 is up to 25% under the situation that medium absorbs, the luminous energy that extraneous light arrives human eye is up to 50%, is not used in to observe extraneous scenery.
Patent documentation CN200610034306.4 (open day is on September 12nd, 2007) proposes a kind of optical imaging system of Helmet Mounted Display; Like Fig. 3; Comprise image information display source 1, free curved surface prism 2 and combined prism 17, first light 4 that image information display source 1 is sent gets into combined prism 17 through free curved surface prism 2, includes a half-reflecting half mirror 8 in the combined prism 17 at least; Half-reflecting half mirror 8 is positioned at by first direction and incides on the light path of first light 4 on it; And be positioned at by second direction and incide on the light path of second light of injecting the outside on it 9, being got into observers' pupil 5 by second light 9 of first light 4 after half-reflecting half mirror 8 reflections and transmission synthetic the 3rd light 16 backs on the half-reflection and half-transmission minute surface, eyepiece 12 fits together with combined prism 17 closely; Free curved surface prism 2 is a concave surface with image information display source 1 adjacent surface; Wherein 3 represent optical surface, the protruding face of 15 representatives, 20 is the emergent pupil distance.Compare with patent documentation CN200510008494.9 and to have lacked a reflecting surface 45.Although the luminous energy of entering human eye 55 has with under the situation increase, its free curved surface prism 2 makes processing cost improve greatly, reduces its reliability simultaneously.
And in above-mentioned two kinds of structures, all have three optical elements or optical module, therefore, after machining, need three parts of assembling, assembling process is complicated.
In addition; Because demonstration source (micro-display 41 and image information display source 1) is apart from the close together of optical module (optical elements sets 43 and combined prism 17); Usually have only 20 to 30mm; So when adjustment, the mobile difficulty of the optical element between demonstration source and optical module (positive lens 42 and free curved surface prism 2) is very big.
The utility model content
One of the utility model technical matters to be solved provides a kind of light-duty, compact, aberration correction is good and reliability is high helmet display optical system.
Two of the utility model technical matters to be solved provides a kind of Helmet Mounted Display with above-mentioned optical system.
The utility model one of solves the problems of the technologies described above through following technical scheme: a kind of optical system of using holographic element; Comprise micro-display and optical combiner; Also comprise the gummed mirror between micro-display and optical combiner, said micro-display is an integral body with gummed mirror gummed, and said optical combiner comprises the right-angle prism of two miter angles, a holographic optical elements (HOE); And the high anti-optical surface in arrowband; The right-angle prism of two miter angles fits tightly together, and said holographic optical elements (HOE) and right-angle prism gummed are an integral body, are positioned at the one side of optical combiner near the gummed mirror; The high anti-optical surface in arrowband is positioned at two right-angle prism junctions, all becomes miter angle with horizontal optical axis and vertical optical axis.
The utility model further is specially:
Said optical axis is perpendicular to the pixel faces of micro-display, and through its center, the optical surface that the optical surface near the human eye pupil of holographic optical elements (HOE), optical combiner reaches near extraneous light is the plane, and all vertical with optical axis.
The reflection of light rate that the 494-544nm wave band is faced in high reflective in described arrowband is greater than 70%, and the transmitance of other visible light wave range is greater than 90%.
Described gummed mirror is a plano-convex lens, and flat one side is with the micro-display gummed and perpendicular to optical axis, protruding one side is aspheric curved surface.
Described micro-display is a display of organic electroluminescence.
The utility model through following technical scheme solve the problems of the technologies described above two: a kind of Helmet Mounted Display with optical system of using holographic element; The optical system of this Helmet Mounted Display comprises micro-display and optical combiner; Also comprise the gummed mirror between micro-display and optical combiner, said micro-display is an integral body with gummed mirror gummed, and said optical combiner comprises the right-angle prism of two miter angles, a holographic optical elements (HOE); And the high anti-optical surface in arrowband; The right-angle prism of two miter angles fits tightly together, and said holographic optical elements (HOE) and right-angle prism gummed are an integral body, are positioned at the one side of optical combiner near the gummed mirror; The high anti-optical surface in arrowband is positioned at two right-angle prism junctions, all becomes miter angle with horizontal optical axis and vertical optical axis.
The utility model and present compared with techniques have the following advantages:
1, since two prisms with holographic optical elements (HOE) is glued together, image source screen and a planoconvex lens are glued together.Optical texture is simpler, after optical element machines, is equivalent to only with two opticses of assembling.
2, whole optical system has only two curved surfaces, is easy to processing.
3, this optical system has symmetry, reduces the difficulty and the processing cost of Design of Mechanical Structure greatly.
4, the workplace of whole optical system (comprising screen) has only four faces to be exposed in the air altogether, and wherein two faces are in the inside of physical construction, and two other is positioned at the outside.And be that three planes add a curved surface altogether, be exposed to two outside workplaces of physical construction and be the plane.This will improve the reliability of optical element surface cleanliness greatly.
6, screen-plano-convex lens combiner increases with respect to the distance of prism to some extent, and this can be so that the adjustment scope be bigger.
7, optical material uses optical plastic PMMA, makes whole optical system weight alleviate greatly.
8, use high anti-optical surface in arrowband and holographic optical elements (HOE), make the efficiency of light energy utilization of inside and outside passage improve greatly.
Through following description and example of giving you, and also through appended claim, embodiment of the utility model and benefit thereof will become obvious to those skilled in the art.
Description of drawings
The optical structure chart of Fig. 1 the utility model optical system
The optical structure chart of a kind of Helmet Mounted Display that Fig. 2 is present
The optical structure chart of the another kind of Helmet Mounted Display that Fig. 3 is present
The optics software simulation figure of Fig. 4 the utility model.
Specific embodiment
See also shown in Figure 1ly, the optical system that the utility model is used holographic element comprises micro-display 32, gummed mirror 31 and an optical combiner 20.
Said optical axis is perpendicular to the pixel faces of micro-display 32, and its center of process.Described micro-display 32 is Gao Liang, high-resolution miniature display screen.
Described gummed mirror 31 is a plano-convex lens, and flat one side is with micro-display 32 gummeds and perpendicular to optical axis, protruding one side is aspheric curved surface.
The utility model adopts micro-display 32 to show the inner passage, and gummed mirror 31 reaches the effect of optically focused and aberration correction, and holographic optical elements (HOE) 21 is used for imaging, and the arrowband anti-optical surface 22 of height is used for the light path of turning back; In order to realize the measurement of external channel, one of them right-angle prism 23 is prism by way of compensation.
Above-mentioned gummed material therefor is cold refined resin.
The light of 22 pairs of specific wavelengths of the high anti-optical surface in described arrowband mainly reflects, and the light of its commplementary wave length carries out transmission, and is concrete; Be employed in 494-544nm wave band plating high-reflecting film (reflectivity is greater than 70%); Other visible light wave range plating anti-reflection film (transmitance is greater than 90%), but observe the influence of color red shift in order to compensate the high anti-scene that causes of 494-544 wave band plating, begin to 780nm from 600nm; Transmitance descends gradually, reduces the red spectral band transmitance.
The principle of work of the utility model is: light beam sends from micro-display 32; Through gummed mirror 31 post-concentrations; Holographic optical elements (HOE) 21 through optical combiner 20 is carried out to picture; Behind the high anti-optical surface 22 in arrowband, some beam reflection, a part of transmission; Folded light beam is through becoming parallel beam behind optical surface 24; Emergent pupil is positioned at human eye pupil 10 places, and extraneous light directly gets into optical combiner 20, behind the high anti-optical surface 22 in arrowband, and a part of beam reflection, a part of transmission, transmitted light beam arrives human eye pupil 10 through optical surface 24 backs.
When image planes were positioned at the infinite distance, the angular resolution of Helmet Mounted Display was:
In the formula: ω, v are respectively the full field angle of vertical and horizontal direction; M, n are respectively level and the pixel counts of vertical direction on the effective display surface of figure image source (square 4: 3).If the pixel count of selection figure image source level and vertical direction is 800 * 600, pel spacing is 2.4 μ m.Calculating the corresponding angular resolution of system by following formula is 0. 77mrad, near minimum resolution 0. 5 mrad of human eye.If be designed to 30 mm to the effective focal length of helmet display optical system, this moment, the spatial frequency of the optical system that angular resolution is complementary should reach 30 lp/ mm.
Then the design of Optical System input is as shown in table 1:
Table 1 optical design input
| Effective focal length | About 30mm |
| Field angle | 25
 |
| The emergent pupil distance | 21mm |
| Exit pupil diameter | 10mm |
| Wavelength | 494
 |
| Resolution | Each visual field is all greater than 0.3 during 30 lp/ mm |
| Luminance non |
 |
| Distortion |
 |
Angle from mathematics; The reality of holographic optical elements (HOE)-void imaging character can be explained like this: the complex amplitude of supposition reference beam is R; The conjugation reference beam, promptly the complex amplitude of reconstruction beam is exactly-R, and symbol "-" means direction and former reference beam in the opposite direction of reconstruction beam.The complex amplitude of definition thing light is O.The definition light intensity is I.Therefore be exactly (* representes conjugate complex number) through light wave amplitude behind the optical hologram diffraction:
This formulate, when reconstruction beam is a conjugate direction with the record reference beam when shining on the holographic optical elements (HOE), the light beam behind the diffraction also will be propagated along the conjugate direction of record object beam, form a real image, and, energy is converged to a point.
When this system of design, adopt the method for " continuous lens ".In fact, continuous lens can be defined as the limit of an array of being made up of infinitely small size holographic optical elements (HOE).In order to realize the record of continuous lens, must use two RP light sources, rather than a pointolite and a branch of planar light beam.
For the better curvature of field of proofreading and correct, a face of the utility model gummed mirror adopts aspheric surface.The circular cone equation is provided by following equation:
Be applied to the small-sized flat-panel monitor of Helmet Mounted Display at present, comprise display of organic electroluminescence (OLED) and LCD (LCD).Owing to need during liquid crystal display displays backlightly, and, subzero also need increase temperature control circuit when work, cause the increase of power consumption for displays and volume, so present embodiment selection OLED is display screen, its detail parameters such as table 2:
Table 2 OLED shields parameter
| Effective display area | 12mm×9mm |
| Resolution | 852×600 |
| Display brightness | 1500cd/m 2 |
| Contrast | Be not less than 300 :1 |
| Gray shade scale | ? 256 |
| Working temperature | -40℃～+65℃ |
| Half spectral width | 50nm(494nm-544nm) |
The optics detail parameters is shown in table 3, table 4:
Table 3 optical texture parameter
| Sequence number | The face type | Radius | Thickness | Glass | Type | Eccentric | |
| Object plane | Sphere |
 |
 |
? | Refraction | ? | |
| | Sphere |
 |
21 | ? | Refraction | ? | |
| 2 | Sphere | 12.6 | PMMA | Refraction | ? | ||
| 3 | Sphere |
 |
-12.6 | PMMA | Reflection | -45 | |
| 4 | Sphere |
 |
-30 | ? | Holographic | ? | |
| 5 | Oblate spheroid | -27.89 | -3 | Lak7 | Refraction | ? | |
| Image planes | Sphere | 0 | ? | Refraction | ? |
The holographic parameter of table 4
| ? | X | y | z |
| Reference light | 0 | 0 | -78.16 |
| Thing light | 0 | 0 | -74.16 |
Because OLED figure image source be monochromatic the demonstration, show that half spectral width of spectrum is about 50nm (being 494nm-544nm), therefore the time to anti-optical surface 22 plated films of arrowband height; Be employed in 494-544nm wave band plating high-reflecting film (reflectivity is greater than 70%); Other visible light wave range plating anti-reflection film (transmitance is greater than 90%), but observe the influence of color red shift in order to compensate the high anti-scene that causes of 494-544 wave band plating, begin to 780nm from 600nm; Transmitance descends gradually, reduces the red spectral band transmitance.As do not consider influence such as absorption, and its transmitance reaches more than 90% for exterior light, and its transmitance reaches 70% for the OLED screen.If adopt five or five beam split, then the highest of its transmitance reaches 50% for exterior light, and its transmitance reaches 50% for the OLED screen.Therefore when using the high anti-optical surface 22 in arrowband users'comfort is improved greatly.
Fig. 4 is the optics software simulation figure of the utility model.
To those skilled in the art, should understand according to the utility model and can know for the adjustment and the variation of said equipment and method.Above-mentionedly be merely exemplary with reference to the described specific implementations of accompanying drawing, and be not intended to limit the scope of the utility model, this scope is defined by appending claims.
Claims (10)
1. an optical system of using holographic element comprises micro-display and optical combiner, it is characterized in that: also comprise the gummed mirror between micro-display and optical combiner; Said micro-display is an integral body with gummed mirror gummed; Said optical combiner comprises the right-angle prism of two miter angles, a holographic optical elements (HOE), and the high anti-optical surface in arrowband, and the right-angle prism of two miter angles fits tightly together; Said holographic optical elements (HOE) and right-angle prism gummed are an integral body; Be positioned at the one side of optical combiner near the gummed mirror, the high anti-optical surface in arrowband is positioned at two right-angle prism junctions, all becomes miter angle with horizontal optical axis and vertical optical axis.
2. the optical system of application holographic element according to claim 1; It is characterized in that: said optical axis is perpendicular to the pixel faces of micro-display; And through its center; The optical surface that the optical surface near the human eye pupil of holographic optical elements (HOE), optical combiner reaches near extraneous light is the plane, and all vertical with optical axis.
3. the optical system of application holographic element according to claim 1 is characterized in that: the reflection of light rate that the 494-544nm wave band is faced in high reflective in described arrowband is greater than 70%, and the transmitance of other visible light wave range is greater than 90%.
4. the optical system of application holographic element according to claim 1 is characterized in that: described gummed mirror is a plano-convex lens, and flat one side is with the micro-display gummed and perpendicular to optical axis, protruding one side is aspheric curved surface.
5. the optical system of application holographic element according to claim 1 is characterized in that: described micro-display is a display of organic electroluminescence.
6. Helmet Mounted Display with optical system of using holographic element; The optical system of this Helmet Mounted Display comprises micro-display and optical combiner; It is characterized in that: also comprise the gummed mirror between micro-display and optical combiner, said micro-display is an integral body with gummed mirror gummed, and said optical combiner comprises the right-angle prism of two miter angles, a holographic optical elements (HOE); And the high anti-optical surface in arrowband; The right-angle prism of two miter angles fits tightly together, and said holographic optical elements (HOE) and right-angle prism gummed are an integral body, are positioned at the one side of optical combiner near the gummed mirror; The high anti-optical surface in arrowband is positioned at two right-angle prism junctions, all becomes miter angle with horizontal optical axis and vertical optical axis.
7. the Helmet Mounted Display with optical system of using holographic element according to claim 6; It is characterized in that: said optical axis is perpendicular to the pixel faces of micro-display; And through its center; The optical surface that the optical surface near the human eye pupil of holographic optical elements (HOE), optical combiner reaches near extraneous light is the plane, and all vertical with optical axis.
8. the Helmet Mounted Display with optical system of using holographic element according to claim 6 is characterized in that: the reflection of light rate that the 494-544nm wave band is faced in high reflective in described arrowband is greater than 70%, and the transmitance of other visible light wave range is greater than 90%.
9. the Helmet Mounted Display with optical system of using holographic element according to claim 6, it is characterized in that: described gummed mirror is a plano-convex lens, flat one side is with the micro-display gummed and perpendicular to optical axis, protruding one side is aspheric curved surface.
10. the Helmet Mounted Display with optical system of using holographic element according to claim 6, it is characterized in that: described micro-display is a display of organic electroluminescence.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201120511434XU CN202433602U (en) | 2011-12-09 | 2011-12-09 | Optical system using holographic element and head mounted display having the optical system |
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| CN201120511434XU CN202433602U (en) | 2011-12-09 | 2011-12-09 | Optical system using holographic element and head mounted display having the optical system |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104407440A (en) * | 2014-11-19 | 2015-03-11 | 东南大学 | Holographic display device with sight tracking function |
| WO2016101861A1 (en) * | 2014-12-26 | 2016-06-30 | 成都理想境界科技有限公司 | Head-worn display device |
| CN106249415A (en) * | 2016-08-31 | 2016-12-21 | 深圳超多维科技有限公司 | A kind of AR display device and wear-type AR display device |
| CN110161683A (en) * | 2018-02-12 | 2019-08-23 | 杭州太若科技有限公司 | Image projection apparatus and AR show equipment |
| CN110161685A (en) * | 2018-02-12 | 2019-08-23 | 杭州太若科技有限公司 | AR display device and wearable AR equipment |
-
2011
- 2011-12-09 CN CN201120511434XU patent/CN202433602U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104407440A (en) * | 2014-11-19 | 2015-03-11 | 东南大学 | Holographic display device with sight tracking function |
| WO2016101861A1 (en) * | 2014-12-26 | 2016-06-30 | 成都理想境界科技有限公司 | Head-worn display device |
| CN106249415A (en) * | 2016-08-31 | 2016-12-21 | 深圳超多维科技有限公司 | A kind of AR display device and wear-type AR display device |
| CN106249415B (en) * | 2016-08-31 | 2019-03-26 | 深圳超多维科技有限公司 | A kind of AR display device and wear-type AR show equipment |
| CN110161683A (en) * | 2018-02-12 | 2019-08-23 | 杭州太若科技有限公司 | Image projection apparatus and AR show equipment |
| CN110161685A (en) * | 2018-02-12 | 2019-08-23 | 杭州太若科技有限公司 | AR display device and wearable AR equipment |
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Granted publication date: 20120912 |