CN204166198U - A kind of HMD projection display optical system - Google Patents
A kind of HMD projection display optical system Download PDFInfo
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- CN204166198U CN204166198U CN201420682103.6U CN201420682103U CN204166198U CN 204166198 U CN204166198 U CN 204166198U CN 201420682103 U CN201420682103 U CN 201420682103U CN 204166198 U CN204166198 U CN 204166198U
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Abstract
The utility model provides a kind of HMD projection display optical system, and surveyed to human eye side by thing, described HMD projection display optical system comprises: Lcos, PBS prism, the first prism and the second prism; Described second prism is convex surface prism, and one side is convex spherical, scribbles part reflective semitransparent film with on the relative inclined-plane of described convex spherical; Described second prism is glued together by the inclined-plane of described part reflective semitransparent film and described first prism; Described Lcos is irradiated after the PBS prism described in light transmission that one area source produces, produce image, the light of described image enters human eye through the reflection of the reflection of described PBS prism, the transmission of described first prism, the reflection of described convex spherical and described part reflective semitransparent film successively; The extraneous scene be positioned at above described first prism enters described human eye through described first prism and the second prism.HMD projection display optical system of the present utility model is simple and compact for structure, prism thickness is little, volume is little, lightweight, quality of optical imaging is high.
Description
Technical field
The utility model is about optical projection display technique, particularly about a kind of HMD projection display optical system.
Background technology
Wear-type visual device (Head Mount Display HMD) weight of equipment carries comfort level gently, preferably and high-performance is that current optical designs requisite requirement, and these factors cause the design of its optical system to be a very challenging job.HMD projector equipment appears at military field the earliest, can show tactical information in real time, and auxiliary mark aims at and identifies, also can be used for night vision system.Along with the continuous progress of design concept, manufacture level and micro-display technique, the more and more miniaturization of HMD projector equipment, and progress into daily life, be now widely used in the every field of the virtual reality technologies such as amusement, analog simulation training, operation.The optical system of HMD projection display apparatus is an image enhancement system, the image that micro-display produces amplifies by optical system, a virtual image of amplifying is presented in the front a distance of human eye, user can be immersed among virtual situation completely, also can combine with reality, form a kind of expansion reality scene.In document at present about the optical system of HMD projection display apparatus, what substantially adopt the analysis of Optical System Design is conventional lenses formula or free form surface/refraction and diffraction hybrid structure, although the first mechanism mostly is rotational symmetric goggle structure optical property can be also correcting distorted preferably close to diffraction limit, but the complex structure of multiple lens, debug with processing request precision high, volume weight is also very large, wear for a long time and can cause neck fatigue, the second free form surface type structure and folding/hybrid mechanism design more difficult, spended time is longer, and the producer of element is fewer, expensive.
Utility model content
To achieve these goals, the utility model provides a kind of HMD projection display optical system, to improve image quality, and reduces volume, saving cost.
To achieve these goals, the utility model provides a kind of HMD projection display optical system, and surveyed to human eye side by thing, described HMD projection display optical system comprises: Lcos, PBS prism, the first prism and the second prism; Described second prism is convex surface prism, and one side is convex spherical, scribbles part reflective semitransparent film with on the relative inclined-plane of described convex spherical; Described second prism is glued together by the inclined-plane of described part reflective semitransparent film and described first prism;
Described Lcos is irradiated after the PBS prism described in light transmission that one area source produces, produce image, the light of described image enters human eye through the reflection of the reflection of described PBS prism, the transmission of described first prism, the reflection of described convex spherical and described part reflective semitransparent film successively;
The extraneous scene be positioned at above described first prism enters described human eye through described first prism and the second prism.
In one embodiment, described PBS prism is formed by two pieces of prisms gummeds, when the irradiation of described image is on described PBS prism, the cemented surface of two pieces of described prisms reflects.
In one embodiment, the horizontal field of view angle of described human eye is ± 10 °, and vertical field of view angle is ± 8.7 °, and described horizontal field of view angle and described vertical field of view tangent of an angle ratio should be 16:9.
In one embodiment, described human eye is 15mm to described second prism.
In one embodiment, the gummed part bias formed after described second prism and described first prism cementing is less than or equal to 10 '; The first parallel error of described first prism and described second prism is the 5 ', the second parallel error is 10 '; The thickness of described second prism and described first prism is 9mm; The inclination angle on the inclined-plane of described second prism and described first prism is 45 °.
In one embodiment, the pixel of described Lcos is 640 × 360, and effective dimensions is 8.448 × 4.752mm, and Diagonal Dimension is about 9.8mm.
In one embodiment, described first prism is six prisms, and except the inclined-plane of described first prism, all the other four faces are all mutually vertical with bottom surface; The reflection and transmission of described part reflective semitransparent film is than being 1:1,1:2 or 2:1; Described convex spherical is the one in aspheric surface, quadric surface, free form surface or sphere.
In one embodiment, the directional light that described area source produces enters described Lcos through P light after described PBS prism, and after described Lcos modulation, the image of outgoing S light, enters described PBS prism back reflection again.
In one embodiment, described human eye is less than 60mm to the total optical path length of the image planes of described Lcos.
In one embodiment, the aperture of described first prism and the second prism is 5, and local aperture is 0.5.
The beneficial effect of the utility model embodiment is, HMD projection display optical system of the present utility model is simple and compact for structure, and prism thickness is little and volume is little, lightweight, quality of optical imaging is high, processing cost is low.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only embodiments more of the present utility model, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of the HMD projection display optical system of the utility model embodiment;
Fig. 2 is the light path schematic diagram that the image of the utility model embodiment produces;
Fig. 3 A is that in the utility model embodiment, vertical field of view angle is the vertical axial aberration family curve of 0 °;
Fig. 3 B is that in the utility model embodiment, vertical field of view angle is the vertical axial aberration family curve of 8.7 °;
Fig. 3 C is that in the utility model embodiment, vertical field of view angle is the vertical axial aberration family curve of-8.7 °;
Fig. 3 D is that in the utility model embodiment, vertical field of view angle is the vertical axial aberration family curve of-7.07 °;
Fig. 3 E is that in the utility model embodiment, vertical field of view angle is the vertical axial aberration family curve of 7.07 °;
Fig. 4 is the curvature of field and the distortion performance curve of the utility model embodiment;
Fig. 5 is the chromatic longitudiinal aberration family curve of the utility model embodiment;
Fig. 6 is the modulation transfer function family curve MTF of the utility model embodiment;
Fig. 7 is the relative distortion schematic diagram of the utility model embodiment;
Fig. 8 A is point range figure when vertical field of view angle is 0 ° in the utility model embodiment;
Fig. 8 B is point range figure when vertical field of view angle is 8 ° in the utility model embodiment;
Fig. 8 C is point range figure when vertical field of view angle is-8 ° in the utility model embodiment;
Fig. 8 D is point range figure when vertical field of view angle is-7.07 ° in the utility model embodiment;
Fig. 8 E is point range figure when vertical field of view angle is 7.07 ° in the utility model embodiment.
Embodiment
Below in conjunction with the accompanying drawing in the utility model embodiment, be clearly and completely described the technical scheme in the utility model embodiment, obviously, described embodiment is only the utility model part embodiment, instead of whole embodiments.Based on the embodiment in the utility model, those of ordinary skill in the art are not making the every other embodiment obtained under creative work prerequisite, all belong to the scope of the utility model protection.
The utility model provides a kind of HMD projection display optical system, based on PBS polarization, reflection, energy beam splitting, light synthesis, light path principle of reversibility, improve optical system quality, reduce difficulty of processing, reduce optical system size, the following detailed description of as follows:
As shown in Figure 1, the utility model provides a kind of HMD projection display optical system, surveyed to human eye side by thing, described HMD projection display optical system comprises: liquid crystal on silicon (Liquid Crystal on Silicon is called for short Lcos) 7, PBS prism, the first prism 3 and the second prism 2.
Second prism 2 is convex surface prism, and one side is convex spherical 8, is inclined-plane 9, inclined-plane 9 scribbles part reflective semitransparent film with the relative one side of convex spherical.This second prism 2 is glued together by the inclined-plane of part reflective semitransparent film and the first prism 3, namely the second prism 2 and the first prism 3 glued together.Light path, image can be transmitted between the second prism 2 and PBS prism after gummed.
The design of convex spherical 8 is as follows: the one side of the second prism 2 is coated with internal reflection film, and face type is the one in aspheric surface, quadric surface, free form surface or sphere, and internal reflection film is metallic reflective coating, and reflectivity is greater than 98%.
The convex spherical 8 of the second prism 2, as imaging optical path part, is play by convex refractive and converges the effect of light enlarged image, be equivalent to image in infinite point.In the distance that human eye front is very little, human eye does not see object, and after adding convex spherical 8, the object before human eye enters human eye through half-reflection and half-transmission convex surface prism outgoing directional light, be equivalent to infinite point object and enter human eye, in human eye focal-distance tuning range, can object be seen clearly.
Irradiate Lcos7 after the light transmission PBS prism that one area source 6 produces, produce image.Fig. 2 is the travel path schematic diagram of the light path that image produces, as shown in Figures 1 and 2, the light of image is successively through reflection and the aberration correction of the reflection of PBS prism, the transmission of the first prism 3, the convex spherical 8 of the second prism 2, the reflection eventually passing part reflective semitransparent film 13 enters human eye (i.e. entrance pupil) 1, and what now human eye was seen is virtual scene.
As shown in Figure 1, the extraneous scene be positioned at above the first prism 3 enters human eye 1 through the first prism 3 and the second prism 2, and what now human eye was seen is real scene.
Adopt light path principle of reversibility reverse design during the design of HMD projection display optical system of the present utility model, the gummed that the directional light that extraneous scene sends entered the second prism 2 and the first prism 3 enters people's human eye, and human eye can see external scene.Simultaneously, the image planes that the image planes that Lcos7 produces produce are through the reflection of PBS reflection, the transmission of the first prism 3, the convex spherical 8 of the second prism 2, the reflection eventually passing the part reflective semitransparent film of the second prism 2 enters human eye, like this while human eye sees extraneous infinite distance object, also clearly can see the image information that image source (Lcos7) produces, achieve combination that is virtual and reality.
For realizing combination that is virtual and reality, HMD projection display optical system of the present utility model have employed the gummed (i.e. the gummed of the second prism 2 and the first prism 3 formed cemented prism) of half-reflection and half-transmission convex surface prism and common prism.Can enter human eye for realizing virtual image, human eye can see image clearly, devises cemented prism; For simulating the infinite distance imaging design convex spherical 8 of the second prism 2.Computer image genration part, HMD projection display optical system of the present utility model have employed Lcos projection display technique, Lcos produces image needs even collimated ray to irradiate and PBS prism, therefore area source is devised, what adopt is the mode that led adds even photoconduction tabula rasa or OLED backlight, due to wave band, comparatively wide angle of incidence is comparatively large, devises the PBS prism of ZF2 material.In other words, in the light path of HMD projection display optical system of the present utility model, the function of each optical element is as follows: the effect in the half-reflection and half-transmission face (face at part reflective semitransparent film place) of the second prism 2 is the combinations realizing external scene and image source; The effect of convex spherical 8 is that process image is equivalent to image in infinite point, achieves the effect of amplification and aberration balancing; The effect of the first prism 3 is the transmission realizing light path, realizes the minimized requirement of optic thickness yardstick before human eye simultaneously, can reduce space, more easily wear, also more attractive in appearance in appearance.PBS prism, area source (Oled backlight or led light guide plate) 6 and Lcos7 are image source generation modules.
In one embodiment, PBS prism is formed by two pieces of prisms 4,5 gummed, when the light of image is radiated on PBS prism, the cemented surface 11 of two pieces of prisms 4,5 reflects.
The mode that second prism 2 and the first prism 3 glue together can have multiple, and in one embodiment, it is glued together that the second prism 2 and the first prism 3 pass through light-sensitive emulsion.When it should be noted that the second prism 2 and the first prism 3 glue together, cemented surface must not have bubble dust and spot.
In one embodiment, the gummed part bias that the second prism 2 and the first prism 3 glue together rear formation is less than or equal to 10 ', and the first parallel error of the first prism 3 and the second prism 2 is the 5 ', the second parallel error is 10 '.
In one embodiment, the thickness of the second prism 2 and the first prism 3 is 9mm.In the design of the second prism 2 and the first prism 3, the second prism 2 and the first prism 3 generally need to be less than 10mm.
The peripheral field of HMD projection display optical system is greater than 0.3 at the MTF at 30lp/mm spatial frequency place, and the relative distortion of system is less than 1.5%.
In one embodiment, the aperture of the first prism 3 and the second prism 2 is 5, and local aperture is 0.5.
In one embodiment, the inclination angle on the inclined-plane of the second prism 2 and the first prism 3 is 45
°, namely the number of degrees of angle A are 45 °, and in addition, as shown in Figure 1, angle B and angle C is 145 °, and the utility model is not as limit.On the cemented surface of the second prism 2 and the first prism 3, the Images uniting that extraneous scene and Lcos7 produce, enters human eye jointly.
In one embodiment, the material that the second prism 2 and the first prism 3 adopt is optical grade acrylic PMMA or CAF2 or K9, and convex surface has the effect of amplification, reversing image planes.The density of PMMA is 1.19g/cm
3, the density of K9 glass is 3.18g/cm
3, can find out and adopt PMMA left and right more half as large than the weight of employing K9 glass, and also little from quality of optical imaging difference.
In one embodiment, the first prism 3 is six prisms, and except the inclined-plane 10 of the first prism 3, all the other four faces are all mutually vertical with bottom surface 12, and six faces of the first prism 3 all can plate anti-reflection film.
In one embodiment, the reflection and transmission of part reflective semitransparent film is than being 1:1,1:2 or 2:1, and the utility model is not as limit.
In one embodiment, in order to increase the transmitance of light path, for all prisms in HMD projection display optical system, light path, through part, needs all to plate anti-reflection film, transmitance >=98% at exiting surface and incidence surface, and rete requires firmly evenly without spot.
Visual field for human eye is designed, and in one embodiment, the horizontal field of view angle of human eye is ± 10 °, and vertical field of view angle is ± 8.7 °.When human eye horizontal field of view angle is ± 10 °, when vertical field of view angle is ± 8.7 °, far can sees the image of long 1.4m, wide 1.2m at 4m clearly, be equivalent to the TV of 73 inches.When adopt LCOS be image source time, the ratio of width to height due to its output image is 16:9, so in HMD projection display optical system of the present utility model, human eye horizontal field of view angle and vertical field of view tangent of an angle ratio should be 16:9.
In one embodiment, human eye is 15mm to the distance (entrance pupil distance) of half-reflection and half-transmission prism 1, and mentality of designing is as follows: consider the ciliary length of people, entrance pupil distance should be more than or equal to 6mm; Consider the crowd of wearing glasses, entrance pupil distance should be less than or equal to 20mm, but along with the increase of distance, the one-piece construction of optical system will increase, and considers, and entrance pupil distance is designed to 15mm.
For the design of Lcos, in one embodiment, the pixel of Lcos is 640 × 360, and effective dimensions is 8.448 × 4.752mm, and Diagonal Dimension is about 9.8mm.The directional light that area source produces through P light, enters Lcos after P light after PBS prism, and the image of outgoing S light after Lcos modulation, the image of S light enters PBS prism back reflection, enters HMD projection display optical system, forms light path path.
In one embodiment, in order to meet the requirement that volume is little and image quality is high simultaneously, human eye is less than 60mm to the total optical path length of the image planes of Lcos, and optical element portion total length is less than 40mm.In order to user can wear easily, and can not produce very heavy sensation after the wearing, HMD projection display optical system of the present utility model reduces the volume of optical system, alleviates the weight of optical system.
HMD projection display optical system of the present utility model needs to be designed into pupil of the eye eyelet footpath, in one embodiment, need secretly bright according to object, pupil diameter can change (2 ~ 8mm) automatically, to regulate the luminous energy entering human eye, consider from optical system structure, the less then structure of entrance pupil is less; From Power supply consider, entrance pupil is larger, and the brightness of lighting source is less, considers, entrance pupil human eye aperture be designed to 5mm.
HMD projection display optical system of the present utility model needs aberration correction: first correct aberration when not adding prism, adds the change of prism aberration not quite after correction.Dominant aberration has spherical aberration, coma, astigmatism, the curvature of field, distortion.Utilize cemented prism group aberration correction.
The wavelength coverage of image that Lcos produces, at visible light wave range, is about 400 to 700nm, and in the utility model embodiment, sampling adopts F, C, D light in optics, and the visible ray that namely wavelength is respectively 486nm, 588nm, 656nm carries out design analysis.
As Fig. 3 A ~ 5 sets forth the aberration characteristic curve of HMD projection display optical system of the present utility model.From Fig. 3 A ~ Fig. 3 E, the axial aberration that hangs down all is less than 20um in whole visual field.According to Fig. 4, maximum distortion is 1.4%, and the maximum curvature of field is 0.16mm.Known from Fig. 5 (horizontal ordinate is chromatic longitudiinal aberration size, and ordinate is visual field size), chromatic longitudiinal aberration is less than 16um, and this shows that the aberration characteristic of HMD projection display optical system of the present utility model meets the demands.
Fig. 6 gives the central vision of HMD projection display optical system of the present utility model and modulation transfer function (MTF) curve of peripheral field.Known central vision and peripheral field are all greater than 0.3 at the MTF at 30lp/mm spatial frequency place.The relative distortion of native system is less than 1.4% as can be seen from Figure 7.Known according to Fig. 8 A ~ Fig. 8 E (point range figure), in whole visual field, the maximum radius of the root mean square disc of confusion of HMD projection display optical system of the present utility model is 9.8um.The aberration of HMD projection display optical system of the present utility model is obtained for control substantially, and quality of optical imaging is higher.
The beneficial effect of the utility model embodiment is:
The basis of the first traditional mechanism disclosed in the introduction is improved, provides reflection, folding spreads out hybrid HMD projection display optical system.At present, the thickness of glass of the HMD projection optical system that Google of the U.S. and Sony corporation of Japan adopt is all at more than 10mm, and the device thickness in the utility model only has 9mm, have employed the paths principle being different from Google, makes structure more simply compact.
In addition, HMD projection display optical system of the present utility model simplifies paths, and reduce optical system size and volume, reduce bulking value, quality of optical imaging is high, and processing cost is low.
Those skilled in the art should understand, embodiment of the present utility model can be provided as method, system or computer program.Therefore, the utility model can adopt the form of complete hardware embodiment, completely software implementation or the embodiment in conjunction with software and hardware aspect.And the utility model can adopt in one or more form wherein including the upper computer program implemented of computer-usable storage medium (including but not limited to magnetic disk memory, CD-ROM, optical memory etc.) of computer usable program code.
The utility model describes with reference to according to the process flow diagram of the method for the utility model embodiment, equipment (system) and computer program and/or block scheme.Should understand can by the combination of the flow process in each flow process in computer program instructions realization flow figure and/or block scheme and/or square frame and process flow diagram and/or block scheme and/or square frame.These computer program instructions can being provided to the processor of multi-purpose computer, special purpose computer, Embedded Processor or other programmable data processing device to produce a machine, making the instruction performed by the processor of computing machine or other programmable data processing device produce device for realizing the function of specifying in process flow diagram flow process or multiple flow process and/or block scheme square frame or multiple square frame.
These computer program instructions also can be stored in can in the computer-readable memory that works in a specific way of vectoring computer or other programmable data processing device, the instruction making to be stored in this computer-readable memory produces the manufacture comprising command device, and this command device realizes the function of specifying in process flow diagram flow process or multiple flow process and/or block scheme square frame or multiple square frame.
These computer program instructions also can be loaded in computing machine or other programmable data processing device, make on computing machine or other programmable devices, to perform sequence of operations step to produce computer implemented process, thus the instruction performed on computing machine or other programmable devices is provided for the step realizing the function of specifying in process flow diagram flow process or multiple flow process and/or block scheme square frame or multiple square frame.
Apply specific embodiment in the utility model to set forth principle of the present utility model and embodiment, the explanation of above embodiment just understands method of the present utility model and core concept thereof for helping; Meanwhile, for one of ordinary skill in the art, according to thought of the present utility model, all will change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model.
Claims (10)
1. a HMD projection display optical system, is characterized in that, surveyed to human eye side by thing, described HMD projection display optical system comprises: Lcos, PBS prism, the first prism and the second prism; Described second prism is convex surface prism, and one side is convex spherical, scribbles part reflective semitransparent film with on the relative inclined-plane of described convex spherical; Described second prism is glued together by the inclined-plane of described part reflective semitransparent film and described first prism;
Described Lcos is irradiated after the PBS prism described in light transmission that one area source produces, produce image, the light of described image enters human eye through the reflection of the reflection of described PBS prism, the transmission of described first prism, the reflection of described convex spherical and described part reflective semitransparent film successively;
The extraneous scene be positioned at above described first prism enters described human eye through described first prism and the second prism.
2. HMD projection display optical system according to claim 1, is characterized in that, described PBS prism is formed by two pieces of prisms gummeds, when the irradiation of described image is on described PBS prism, the cemented surface of two pieces of described prisms reflects.
3. HMD projection display optical system according to claim 1, is characterized in that, the horizontal field of view angle of described human eye is ± 10 °, and vertical field of view angle is ± 8.7 °, and described horizontal field of view angle and described vertical field of view tangent of an angle ratio should be 16:9.
4. HMD projection display optical system according to claim 1, is characterized in that, described human eye is 15mm to described second prism.
5. HMD projection display optical system according to claim 2, is characterized in that, the gummed part bias formed after described second prism and described first prism cementing is less than or equal to 10 '; The first parallel error of described first prism and described second prism is the 5 ', the second parallel error is 10 '; The thickness of described second prism and described first prism is 9mm; The inclination angle on the inclined-plane of described second prism and described first prism is 45 °.
6. HMD projection display optical system according to claim 1, is characterized in that, the pixel of described Lcos is 640 × 360, and effective dimensions is 8.448 × 4.752mm, and Diagonal Dimension is about 9.8mm.
7. HMD projection display optical system according to claim 1, is characterized in that, described first prism is six prisms, and except the inclined-plane of described first prism, all the other four faces are all mutually vertical with bottom surface; The reflection and transmission of described part reflective semitransparent film is than being 1:1,1:2 or 2:1; Described convex spherical is the one in aspheric surface, quadric surface, free form surface or sphere.
8. HMD projection display optical system according to claim 1, it is characterized in that, the directional light that described area source produces enters described Lcos through P light after described PBS prism, and after described Lcos modulation, the image of outgoing S light, enters described PBS prism back reflection again.
9. HMD projection display optical system according to claim 1, is characterized in that, described human eye is less than 60mm to the total optical path length of the image planes of described Lcos.
10. HMD projection display optical system according to claim 7, is characterized in that, the aperture of described first prism and the second prism is 5, and local aperture is 0.5.
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| CN201420682103.6U CN204166198U (en) | 2014-11-14 | 2014-11-14 | A kind of HMD projection display optical system |
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| CN201420682103.6U CN204166198U (en) | 2014-11-14 | 2014-11-14 | A kind of HMD projection display optical system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105652440A (en) * | 2014-11-14 | 2016-06-08 | 北京云豆科技有限公司 | HMD projection display optical system |
| CN106526848A (en) * | 2015-09-09 | 2017-03-22 | 宁波舜宇光电信息有限公司 | Near-to-eye display equipment, display device thereof and image display method |
-
2014
- 2014-11-14 CN CN201420682103.6U patent/CN204166198U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105652440A (en) * | 2014-11-14 | 2016-06-08 | 北京云豆科技有限公司 | HMD projection display optical system |
| CN106526848A (en) * | 2015-09-09 | 2017-03-22 | 宁波舜宇光电信息有限公司 | Near-to-eye display equipment, display device thereof and image display method |
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