CN204241817U - Wearable projection display optical system - Google Patents
Wearable projection display optical system Download PDFInfo
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- CN204241817U CN204241817U CN201420634558.0U CN201420634558U CN204241817U CN 204241817 U CN204241817 U CN 204241817U CN 201420634558 U CN201420634558 U CN 201420634558U CN 204241817 U CN204241817 U CN 204241817U
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Abstract
The utility model provides a kind of wearable projection display optical system, and surveyed to human eye side by thing, described wearable projection display optical system comprises: Lcos, PBS prism, catoptron, lens combination, total-reflection prism group and half-reflection and half-transmission prism; The image produced after Lcos described in one side light source irradiation enters human eye through the reflection of the transmission of the reflection of the reflection of described PBS prism, described catoptron, described lens combination, the total reflection of described total-reflection prism group and described half-reflection and half-transmission prism successively; The extraneous scene be positioned at above described half-reflection and half-transmission prism enters described human eye through described total-reflection prism group and half-reflection and half-transmission prism.Wearable projection display optical system of the present utility model is simple and compact for structure, and lens combination lens are few, prism thickness is little and volume is little, lightweight, quality of optical imaging is high.
Description
Technical field
The utility model is about optical projection display technique, particularly about the wearable projection display optical system of one.
Background technology
What Wearable device was lightweight, good carry comfort level and high performance optical system is that current optical designs requisite requirement.Wearable 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 wearable 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 wearable 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 wearable projection optical system, what substantially adopt the analysis of Optical System Design is conventional lenses formula or free form surface/refraction and diffraction hybrid structure, conventional lenses formula structure mostly is rotational symmetric goggle structure, although 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, free form surface/refraction and diffraction hybrid structure design is more difficult, spended time is longer, and the producer of element is fewer, expensive, and mainly concentrate on external.
Utility model content
To achieve these goals, the utility model provides a kind of wearable projection display optical system, to improve image quality, and reduces volume, saving cost.
To achieve these goals, the utility model provides a kind of wearable projection display optical system, surveyed to human eye side by thing, described wearable projection display optical system comprises: Lcos, PBS prism, catoptron, lens combination, total-reflection prism group and half-reflection and half-transmission prism;
The image produced after Lcos described in one side light source irradiation enters human eye through the reflection of the transmission of the reflection of the reflection of described PBS prism, described catoptron, described lens combination, the total reflection of described total-reflection prism group and described half-reflection and half-transmission prism successively;
The extraneous scene be positioned at above described half-reflection and half-transmission prism enters described human eye through described total-reflection prism group and half-reflection and half-transmission prism.
In one embodiment, described total-reflection prism group comprises: a quadrant prism and a Tp, and described quadrant prism and Tp are glued together by light-sensitive emulsion, the light path of described image in described total-reflection prism group through twice total reflection.
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 13mm to the distance of described half-reflection and half-transmission prism; The pixel of described Lcos is 640 × 360, and effective dimensions is 8.448 × 4.752mm, and Diagonal Dimension is about 9.8mm; The thickness of described total-reflection prism group and half-reflection and half-transmission prism is 7mm.
In one embodiment, described half-reflection and half-transmission prism is right-angle prism, the inclined-plane of described right-angle prism and the inclined-plane of described quadrant prism glued together, and after gummed, gummed part bias is less than or equal to 10 '; Leg-of-mutton two acute angles that described right-angle prism is corresponding are respectively 30 °, 60 °, and the inclined-plane of described right-angle prism is coated with part reflective semitransparent film; The first parallel error of described half-reflection and half-transmission prism and quadrant prism is the 5 ', the second parallel error is 10 '.
In one embodiment, lens combination comprises two panels the first lens glued together and the second lens, and described first lens are negative lens, and the second lens are positive lens.
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 80mm to the total optical path length of the image planes of described Lcos.
In one embodiment, the aperture of described first lens and the second lens is 5, local aperture be 0.5, thickness deviation is ± 0.1mm, and bias is ± 0.1mm, tilt for ± 5 '.
The beneficial effect of the utility model embodiment is, wearable projection display optical system of the present utility model is simple and compact for structure, and lens combination lens are few, prism thickness is little and volume is little, lightweight, quality of optical imaging is high.
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 wearable 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.
As shown in Figure 1, the utility model provides a kind of wearable projection display optical system, surveyed to human eye side by thing, described wearable projection display optical system comprises: liquid crystal on silicon (Liquid Crystal on Silicon is called for short Lcos) 9, PBS prism, catoptron 6, lens combination, total-reflection prism group and half-reflection and half-transmission prism 1.
Total-reflection prism group comprises: quadrant prism 2 and Tp 3, and quadrant prism 2 and Tp 3 are glued together by light-sensitive emulsion.Total-reflection prism group has lens 4 and lens 5 gummed to form.PBS prism is formed by Tp 7 and Tp 8 gummed.
As shown in Figure 1, be arranged on PBS prism side area source 9 and irradiate Lcos generation image by PBS prism.Fig. 2 is the light path schematic diagram that image produces.As shown in Figures 1 and 2, the image that Lcos is illuminated rear generation successively in the transmission of lens 4 and lens 5 in the reflection of the reflection of PBS prism intermediate cam shape prism 7 and the cemented surface of Tp 8, catoptron 6, lens combination, total-reflection prism group quadrant prism 2 and the total reflection of Tp 3 and the reflection of half-reflection and half-transmission prism 1 enter human eye (i.e. entrance pupil), what now human eye was seen is virtual scene.
Be arranged in the extraneous scene above half-reflection and half-transmission prism 1 and enter human eye through the quadrant prism 2 of half-reflection and half-transmission prism 1 and total-reflection prism group, now the scene for reality seen of human eye.
Light channel structure of the present utility model adopts the reverse design of light path principle of reversibility when designing, the gummed that the directional light that external scene sends entered half-reflection and half-transmission prism 1 and quadrant prism 2 enters human eye, and human eye can see external scene.Simultaneously, the image planes that Lcos produces are amplified through PBS prismatic reflection, catoptron reflection, lens combination, the transmission of total-reflection prism group and half-reflection and half-transmission prism, eventually pass half-reflection and half-transmission prism 1 reflection and enter human eye, like this while human eye sees extraneous infinite distance object, also clearly can see the image information that image source produces, achieve combination that is virtual and reality.
In light channel structure, the function of each optical element is as follows: half-reflection and half-transmission prism 1 realizes external scene and image source image and combination, each prism is the transmission realizing light path, realize the minimized requirement of optic thickness yardstick before human eye simultaneously, lens combination plays a part to converge optics enlarged image, can correct multiple aberration simultaneously.Catoptron 6 works light path of turning back, and can reduce space, more easily wear, also more attractive in appearance in appearance.PBS prism, area source (led+ light guide plate) 9 and Lcos are the generation modules of image source.
Half-reflection and half-transmission prism 1, quadrant prism 2 and Tp 3 three prism cementings together, half-reflection and half-transmission prism 1 is right-angle prism, it is glued together that the inclined-plane of right-angle prism and the inclined-plane of quadrant prism 3 pass through light-sensitive emulsion, and gummed part bias is less than or equal to 10 ' after gummed, the gummed design of prism makes virtual image to enter human eye, and human eye can see image clearly.The first parallel error of half-reflection and half-transmission prism 1 and quadrant prism 2 is the 5 ', the second parallel error is 10 '.At half-reflection and half-transmission prism 1 with on the cemented surface of quadrant prism 2, the Images uniting that extraneous scene and Lcos produce, enters human eye jointly.
Quadrant prism 2 and Tp 3 are glued together by light-sensitive emulsion, and the light path of image can through twice total reflection in quadrant prism 2 with Tp 3.It should be noted that when gluing together between above-mentioned each prism, cemented surface must not have bubble dust and spot.
The material that half-reflection and half-transmission prism 1, quadrant prism 2 and Tp 3 three prisms adopt is all the density of optical grade acrylic PMMA, PMMA is 1.19g/cm
3, the density of K9 glass is 3.18g/cm
3, 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 thickness of half-reflection and half-transmission prism 1, quadrant prism 2 and Tp 3 is all 7mm.
Leg-of-mutton two acute angles of half-reflection and half-transmission prism 1 correspondence be respectively 30 ° the angle of the upper right corner (in figure), 60 °, part reflective semitransparent film is coated with on the inclined-plane of this right-angle prism, the angle of quadrant prism 2 be respectively ∠ a=30 °, ∠ b=120 °, ∠ c=25.39 °, ∠ d=154.61 °, the angle of Tp 3 is respectively ∠ e=59.48 °, ∠ f=34.61 °, ∠ g=85.91 °.
In one embodiment, lens 4 and lens 5 adopt light-sensitive emulsion to glue together, and form balsaming lens.The material of lens 4 and lens 5 is respectively German Xiao Te glass BK7 and SF5, and lens 4 are positive lens, and lens 5 are negative lens, and this balsaming lens is mainly used to color difference eliminating, also other aberration of correction portion.
In one embodiment, the design parameter of lens 4 and lens 5 is as follows: aperture is 5, local aperture be 0.5, thickness deviation is ± 0.1mm, and bias is ± 0.1mm, tilt for ± 5 '.
In one embodiment, in order to increase the transmitance of light path, for all prisms in wearable projection display optical system and lens, light path is through part, need to plate anti-reflection film at exiting surface and incidence surface, transmitance >=98%, 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 wearable 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 13mm 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 13mm.
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 wearable 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 80mm to the total optical path length of the image planes of Lcos.
Wearable 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.
Wearable 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 balsaming lens 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 ~ Fig. 5 sets forth the aberration characteristic curve of wearable 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 100um in whole visual field.According to Fig. 4, maximum distortion is 2.5%, and the maximum curvature of field is 0.5mm.Known from Fig. 5 (horizontal ordinate is chromatic longitudiinal aberration size, and ordinate is visual field size), chromatic longitudiinal aberration is less than 1.7um, shows that the aberration characteristic of wearable projection display optical system of the present utility model meets the demands.
Fig. 6 gives the central vision of this wearable projection display optical system and modulation transfer function (MTF) curve of peripheral field.Known central vision and peripheral field are all greater than 0.4 at the MTF at 30lp/mm spatial frequency place.As can be seen from Figure 7, the relative distortion of wearable projection display optical system of the present utility model is less than 2.5%.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 wearable projection display optical system of the present utility model is 16um.The aberration of this wearable projection display optical system is obtained for control substantially, and quality of optical imaging is higher.
In the design of wearable projection display optical system of the present utility model, before human eye, the thickness of optical element prism is thin, only has the thickness of 7mm, simple and compact for structure, and the quantity of lens combination is few and volume is little, lightweight.Handling ease cost is low, and quality of optical imaging is high.
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 wearable projection display optical system, is characterized in that, surveyed to human eye side by thing, described wearable projection display optical system comprises: Lcos, PBS prism, catoptron, lens combination, total-reflection prism group and half-reflection and half-transmission prism;
The image produced after Lcos described in one side light source irradiation enters human eye through the reflection of the transmission of the reflection of the reflection of described PBS prism, described catoptron, described lens combination, the total reflection of described total-reflection prism group and described half-reflection and half-transmission prism successively;
The extraneous scene be positioned at above described half-reflection and half-transmission prism enters described human eye through described total-reflection prism group and half-reflection and half-transmission prism.
2. wearable projection display optical system according to claim 1, it is characterized in that, described total-reflection prism group comprises: a quadrant prism and a Tp, described quadrant prism and Tp are glued together by light-sensitive emulsion, the light path of described image in described total-reflection prism group through twice total reflection.
3. wearable 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. wearable projection display optical system according to claim 1, is characterized in that, described human eye is 13mm to the distance of described half-reflection and half-transmission prism; The thickness of described total-reflection prism group and half-reflection and half-transmission prism is 7mm.
5. wearable projection display optical system according to claim 2, it is characterized in that, described half-reflection and half-transmission prism is right-angle prism, the inclined-plane of described right-angle prism and the inclined-plane of described quadrant prism glued together, and after gummed, gummed part bias is less than or equal to 10 '; Leg-of-mutton two acute angles that described right-angle prism is corresponding are respectively 30 °, 60 °, and the inclined-plane of described right-angle prism is coated with part reflective semitransparent film; The first parallel error of described half-reflection and half-transmission prism and quadrant prism is the 5 ', the second parallel error is 10 '.
6. wearable 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 9.8mm.
7. wearable projection display optical system according to claim 1, is characterized in that, lens combination comprises two panels the first lens glued together and the second lens, and described first lens are negative lens, and the second lens are positive lens.
8. wearable 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. wearable projection display optical system according to claim 1, is characterized in that, described human eye is less than 80mm to the total optical path length of the image planes of described Lcos.
10. wearable projection display optical system according to claim 7, is characterized in that, the aperture of described first lens and the second lens is 5, local aperture be 0.5, thickness deviation is ± 0.1mm, and bias is ± 0.1mm, tilt for ± 5 '.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420634558.0U CN204241817U (en) | 2014-10-29 | 2014-10-29 | Wearable projection display optical system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420634558.0U CN204241817U (en) | 2014-10-29 | 2014-10-29 | Wearable projection display optical system |
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| CN204241817U true CN204241817U (en) | 2015-04-01 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105629641A (en) * | 2014-10-29 | 2016-06-01 | 北京云豆科技有限公司 | Wearable projection display optical system |
| CN108132538A (en) * | 2018-01-09 | 2018-06-08 | 歌尔科技有限公司 | AR optical systems and AR show equipment |
| CN108319015A (en) * | 2017-04-21 | 2018-07-24 | 北京耐德佳显示技术有限公司 | The nearly eye display device of retinal projection's formula |
-
2014
- 2014-10-29 CN CN201420634558.0U patent/CN204241817U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105629641A (en) * | 2014-10-29 | 2016-06-01 | 北京云豆科技有限公司 | Wearable projection display optical system |
| CN108319015A (en) * | 2017-04-21 | 2018-07-24 | 北京耐德佳显示技术有限公司 | The nearly eye display device of retinal projection's formula |
| CN108132538A (en) * | 2018-01-09 | 2018-06-08 | 歌尔科技有限公司 | AR optical systems and AR show equipment |
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Granted publication date: 20150401 Termination date: 20171029 |