CN103513424B - Perspective display device - Google Patents
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- CN103513424B CN103513424B CN201310454506.5A CN201310454506A CN103513424B CN 103513424 B CN103513424 B CN 103513424B CN 201310454506 A CN201310454506 A CN 201310454506A CN 103513424 B CN103513424 B CN 103513424B
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Abstract
The invention discloses a perspective display device based on plane expanding optical waveguide. The perspective display device is characterized by comprising a display light source, a collimating lens, a light wave coupling input lens, a plane waveguide substrate, a light wave coupling output lens and a light wave beam expanding set in sequence. The display light source is used for emitting image light waves needed for displaying. The collimating lens carries out collimation on the image light waves and then emits collimation light waves. The light wave coupling input lens carries out coupling on the collimation light waves and then emits coupling light waves. The plane waveguide substrate carries out reflecting transmission on the coupling light waves to form full reflecting waves. The light wave coupling output lens carries out coupling on the full reflecting waves and outputs display light waves. The light wave beam expanding set carries out plane expanding on the display waves, and accordingly images enter the view field range of a user. The whole perspective display device has the advantages of being compact in structure, small in size, light in weight, simple in manufacturing technology and large in view field, the lenses are used as light wave coupling input and output devices, coupling efficiency is high, light energy loss is low, the output images are clear, and displayed images are high in quality.
Description
Technical field
The present invention relates to a kind of display system, be specifically related to a kind of perspective display device based on the waveguide of plane expansion optical.
Background technology
At present, the display technique such as flat pannel display, wearable display, notebook display relies on optical device to transmit the image information needing display usually.Such as, the crown is dressed display system and is relied on optical lens and prism to be presented at a distance, human eye front by virtual for picture, is not affecting human eye under the visibility prerequisite of surrounding scenes, can walk on browsing information limit, limit, enhances presence.The main core optical assembly of this type systematic is made up of three parts: light wave input coupling device, light wave transmissions substrate and light wave output coupling device.Although adopt conventional formation method can obtain large visual field, along with the increase of visual field, the weight and volume of optical system entirety sharply increases thereupon, causes the application under many circumstances of this type of optical system to be restricted.Seek light structure for this reason, compact in design, the visual optical system that has Large visual angle and a high resolving power display image become the development trend of this type of imaging display system gradually.
Summary of the invention
In order to solve the problem, the invention provides and a kind of there is Large visual angle, the perspective display device based on the waveguide of plane expansion optical that display frame quality is high.
To achieve these goals, perspective display device provided by the invention adopts following technical scheme.
Based on a perspective display device for plane expansion optical waveguide, there is such feature: comprise successively: display light source, for sending the image light waves needed for display, collimation lens, sends collimated light waves after collimating to image light waves, light wave coupling input prism, sends coupling light wave after collimation light wave is coupled, slab guide substrate, carries out reflections propagate to coupling light wave and forms the ejected wave that is all-trans, light wave coupling output prism, output display light wave after the ejected wave that is all-trans is coupled, and light wave expands group, planar development is carried out to disclosing solution, wherein, collimation lens is arranged on display light source and is coupled with light wave and inputs between prism, collimation lens collimates image light waves, and make collimated light waves incide light wave coupling input prism with certain angle, light wave coupling input prism is connected to one end of slab guide substrate, collimated light waves is coupled in slab guide substrate, make coupling light wave in slab guide substrate, form the ejected wave that is all-trans to propagate, light wave coupling output prism is connected to the other end of slab guide substrate, Wave coupling out-of-plane optical waveguide substrates will be totally reflected, thus form the disclosing solution expanding group output to light wave, light wave expands group and is connected on light wave coupling output prism, mirror imaging principle is utilized to launch disclosing solution.
In perspective display device provided by the invention, such feature can also be had: wherein, collimation lens adopts column prism, collimation lens has light wave input face, light wave output face, and light wave input face is plane, and light wave output face is arc surface, light wave input face alignment image light wave, light wave output face alignment light Wave coupling input prism, the image light waves received collimates by collimation lens, then by light wave output face, the light wave after collimation is incided light wave coupling input prism obliquely.
In perspective display device provided by the invention, can also have such feature: wherein, slab guide substrate is made up of the upper glass planar be parallel to each other and lower-glass plane, and coupling light wave forms the ejected wave that is all-trans between upper glass planar and lower-glass plane.
In perspective display device provided by the invention, such feature can also be had: wherein, light wave coupling input prism has the collimated light waves plane of incidence, the output face of coupling light wave, the first reflecting surface, first reflecting surface and the output face of coupling light wave form the first angle, and the first reflecting surface flushes with upper glass planar, by coupling light wave reflection to slab guide substrate.
In perspective display device provided by the invention, such feature can also be had: wherein, light wave coupling output prism has the second reflecting surface and display plane, and the second reflecting surface and display plane form the second angle, display plane and lower-glass planes align, light wave coupling output prism will be totally reflected after Wave coupling by display plane output display ripple.
In perspective display device provided by the invention, can also have such feature: wherein, light wave expands group and is made up of row's microprism unit, and there is plane of incidence and launch plane, plane of incidence overlaps with display plane, launches plane and carries out planar development to disclosing solution, expand visual field.
In perspective display device provided by the invention, such feature can also be had: wherein, the collimated light waves plane of incidence and the output face of coupling light wave are coated with anti-reflection film, first reflecting surface is coated with reflectance coating, the upper glass planar surface corresponding with lower-glass plane is coated with reflectance coating, second reflecting surface is coated with reflectance coating, and display plane is coated with anti-reflection film.
In perspective display device provided by the invention, can also have such feature: wherein, the projected area of coupling light wave output face in lower-glass plane is half first time inciding the light wave overlay area area in lower-glass plane; Coupling light ripple forms coboundary light wave and lower limb light wave, image light waves after coupling is between coboundary light wave and lower limb light wave, coboundary light wave after coupling through lower-glass plane reflection to upper glass planar, coboundary light wave forms the first incidence point on upper glass planar, lower limb light wave after coupling is refracted to lower-glass plane through the output face of coupling light wave, lower limb light wave forms the second incidence point on the light wave output plane of light wave coupling input prism, first incidence point is adjacent with the second incidence point position
In perspective display device provided by the invention, can also have such feature: wherein, the angle of the first angle and the second angle is equal.
In perspective display device provided by the invention, such feature can also be had:
Wherein, following relation is met between the expansion plane L of described single prism unit and the length S of described display plane:
S=N × L wherein, quantity N >=10.
The effect of invention and effect
According to the perspective display device based on the waveguide of plane expansion optical provided by the invention, collimation lens is utilized to collimate light wave; Light wave is coupled to slab guide substrate by coupling output prism; Slab guide substrate carries out total reflection to light wave and propagates; Light wave is reflected slab guide substrate by coupling output prism; And light wave expands group and positions expansion to light wave.Especially use light wave to expand group and position expansion to light wave, therefore, the present invention has Large visual angle, outstanding advantages that display frame quality is high.In addition, also adopt prism as light wave coupling input, output device, therefore also have coupling efficiency high, light-wave energy loss is few, output image picture advantage clearly.
Accompanying drawing explanation
Fig. 1 is the structural representation of perspective display device in embodiments of the invention;
Fig. 2 is the partial enlarged drawing that in Fig. 1, in perspective display device, letter b is corresponding;
Fig. 3 is the partial enlarged drawing that in Fig. 1, in perspective display device, alphabetical A is corresponding;
Fig. 4 is that in Fig. 1, in perspective display device, light wave expands the structural representation of group;
Fig. 5 adopts convex lens as the light wave propagation schematic diagram of light wave coupling input prism in comparative example; And
Fig. 6 is the structural representation of the wearing display article including perspective display device in embodiments of the invention.
In figure, 1. display light source, 2. image light waves, 3. collimation lens, 31. light wave input faces, 32. light wave output faces, 4. light wave coupling input prism, the 41. collimated light waves planes of incidence, 42. first reflectings surface, 43. coupling light wave output faces, 5. slab guide substrate, glass planar on 51., 52. lower-glass planes, 6. light wave coupling output prism, 61. second reflectings surface, 62. display planes, 7. light wave expands group 71. plane of incidence, 72. launch plane, 8. microprism unit, 9. light source, 10. display module, 201. pointolite, 202. image light waves, 203. biconvex lens, 204. light wave coupling input prisms, 205. slab guide substrates.
Embodiment
Following examples are specifically addressed the present invention by reference to the accompanying drawings.
Embodiment one
Fig. 1 is the structural representation of perspective display device in embodiments of the invention.
As shown in Figure 1, this perspective display device 100 based on the waveguide of plane expansion optical comprises successively: display light source 1, for sending the image light waves 2 needed for display, collimation lens 3, sends collimated light waves after collimating to image light waves 2, light wave coupling input prism 4, sends coupling light wave after collimation light wave is coupled, slab guide substrate 5, carries out reflections propagate to coupling light wave and forms the ejected wave that is all-trans, light wave coupling output prism 6, output display light wave after the ejected wave that is all-trans is coupled, and light wave expands group 7, planar development is carried out to disclosing solution, wherein, collimation lens 3 is arranged on display light source 1 and is coupled with light wave and inputs between prism 3, collimation lens 3 pairs of image light waves 2 collimate, and make collimated light waves 2 incide light wave coupling input prism 4 with certain angle, light wave coupling input prism 4 is connected to one end of slab guide substrate 5, collimated light waves is coupled in slab guide substrate 5, make coupling light wave in slab guide substrate 5, form the ejected wave that is all-trans to propagate, light wave coupling output prism 6 is connected to the other end of slab guide substrate 5, Wave coupling out-of-plane optical waveguide substrates 5 will be totally reflected, thus form the disclosing solution expanding group 7 output to light wave, light wave expands group 7 and is connected on light wave coupling output prism 6, mirror imaging principle is utilized to launch disclosing solution.
Display light source 1, is made up of the display light source of the current main flow such as OLED, Lcos, LCD.Display light source 1 is mainly used in sending the image light waves 2 provided needed for display.Because light source contrast is different with resolution, need when carrying out light source and selecting to choose according to the requirement of slab guide substrate 5 pairs of Different Light lightwave transmission characteristics and the requirement of final display image, otherwise will the appearance of image ghost image be caused, reduce the display quality that image is last.
Collimation lens 3, is made up of the lens pillar after cutting.Collimation lens 3 has light wave input face 31, light wave output face 32, light wave input face 31 is plane, light wave output face 32 is arc surface, light wave input face 31 alignment image light wave, light wave output face 32 alignment light Wave coupling input prism 4, collimation lens 3 according to the size of light source in system and in order to enable light wave utilize total reflection to transmit in slab guide substrate 5, and designs accordingly and processes.Utilize collimation lens 3 to collimate the image glistening light of waves 2 from display light source 1, make it incide in light wave coupling input prism 4.
Light wave coupling input prism 4 has the collimated light waves plane of incidence 41, coupling light wave output face 43, first reflecting surface 42, first reflecting surface 42 and coupling light wave output face 43 form the first angle, and the first reflecting surface 42 flushes with upper glass planar 51, by coupling light wave reflection to slab guide substrate 5.Light wave coupling input prism 4 is as input coupling assembly, and the collimated light waves being mainly used in self-focus lens 3 is in the future coupled in slab guide substrate 5.Carrying out in the process be coupled, mainly utilizing principle of reflection to change light wave propagation direction, meet total reflection condition when light wave is transmitted in slab guide substrate 5 and transmit.In order to can as much as possible collimated light waves Energy Coupling to slab guide substrate 5 and form virtual image, need 43 evaporation one deck anti-reflection films in the collimated light waves plane of incidence 41, coupling light wave output face.
The upper glass planar 51 that slab guide substrate 5 is parallel to each other by two sides and lower-glass plane 52 form.The glass material that can be used as optical waveguide substrates at present has many types (as K9, BK7 etc.), and the refractive index of often kind of material the cause transmitance of the angle of total reflection and material, absorption coefficient different from Abbe number is different.Because slab guide substrate 5 is in the process of transmission total reflection light wave, need while satisfied total reflection light wave does not reflect slab guide substrate 5, reduce material itself as far as possible to the absorption of light-wave energy, otherwise will a large amount of light-wave energies be caused to lose in transmitting procedure, the visibility that effect diagram picture is final.Moreover the material of slab guide substrate 5 itself limits the scope of image and the brightness of image that can transmit in slab guide substrate 5, in order to expand the scope of transmitting image, usual needs according to the certain reflective coating of demand evaporation, give certain expansion to the angle of total reflection of slab guide substrate 5 material in upper glass planar 51 and lower-glass plane 52.
Fig. 2 is the partial enlarged drawing that in Fig. 1, in perspective display device, letter b is corresponding.
As shown in Figure 1 and Figure 2, light wave coupling output prism 6 has the second reflecting surface 61 and display plane 62, and the second reflecting surface 61 forms the second angle with display plane 62, display plane 62 flushes with lower-glass plane 52, and light wave coupling output prism 6 is mainly used to total reflection light Wave coupling out-of-plane optical waveguide substrates 5.Owing to meeting total reflection principle when total reflection light wave transmits in slab guide substrate 5, for making total reflection light Wave coupling output plane optical waveguide substrates 5, total reflection light wave and the angle of lower-glass plane 52 normal should be less than the angle of total reflection (be 41.8 ° for the BK7 glass angle of total reflection).Introducing light wave coupling output prism 6 to realize above-mentioned condition, making total reflection light wave be less than angle, total reflection zero boundary thus coupling output planar substrate 6 by the reflection angle after the reflection of light wave coupling output prism 6 on display plane.In order to make light-wave energy coupling output as much as possible, usually need evaporation one deck reflectance coating on the second reflecting surface 61, evaporation one deck anti-reflection film on display plane 62.
Fig. 4 is that in Fig. 1, in perspective display device, light wave expands the structural representation of group.
As Figure 1 and Figure 4, light wave expands group 7 and is made up of microprism unit 8, it has plane of incidence 71 and launches plane 72, plane of incidence overlaps with display plane, for the display light wave of coupling output, due to the change of direction in space and the angle of divergence is excessive cause and directly observe time only have local light wave can enter observer's pupil, thus cause observing visual field too little, therefore need to introduce light wave and expand group 7.Utilize the light wave of mirror imaging principle to coupling output to launch, thus expand observation visual field.Light wave in the present embodiment expands group 7, utilizes prism group to be expanded by the light wave of coupling output, makes its each microprism unit 8 all can imaging ground output optical signal separately, thus overall expansion observes visual field.There is gap in order to avoid output image or there is lap, the projection of each microprism unit in expansion plane 72 should be connected mutually, the number that composition light wave expands the microprism unit 8 of group 7 can increase and decrease according to specific requirement, in order to reach the effect expanded, light wave expands between the length of plane of incidence 71 in group 7 and the length of lower-glass plane 52 and meets following relation:
S＝n×L
Wherein, S is the length of display plane 62, and L is the length of the expansion plane of single prism unit, and n is ratio between the two, and usual n is greater than 10.
The job step of waveguide device of the present invention and exemplary application:
Fig. 3 is the partial enlarged drawing that in Fig. 1, in perspective display device, alphabetical A is corresponding.
As shown in Figures 1 to 4, from the image light waves 2 of display light source 1 after collimation lens 3 standard, oblique incidence is to inner to coupling input prism 4.After collimated light waves enters coupling input prism 4, in order to ensure that collimated light waves energy reduces loss as much as possible, the angle between the normal that must ensure collimated light waves and the first reflecting surface 42 is greater than the cirtical angle of total reflection.Reflected by the first reflecting surface 42 of coupling input prism 4, meeting with the coupling light wave output face 43 that inputs prism 4 of being coupled there is refraction and enters in slab guide substrate 5.In slab guide substrate 5, because the angle of coupling light wave and the normal between upper glass planar 51 and lower-glass plane 52 is greater than the cirtical angle of total reflection, thus ensure that total reflection light wave does not cause energy loss because refraction leaks out slab guide substrate 5, thus ensure that the brightness that image is final and visual field.Owing to cannot ensure to make it constrain in slab guide substrate 5 completely, total reflection transmission is carried out for part light wave, the loss that reflectance coating reduces reflecting surface light-wave energy can be plated for this reason on upper glass planar 51 and lower-glass plane 52.Total reflection light wave enters coupling output prism 6 through the transmission in slab guide substrate 5, meet with the second reflecting surface 61 of coupling output prism 6, through the reflection of the second reflecting surface 61, angle between total reflection light wave and the normal of display plane 62 is less than the cirtical angle of total reflection, thus total reflection light wave refraction out-of-plane optical waveguide substrates 5, enter light wave and expand group 7, expand the reorientation of group 7 by light wave and expand, the image of transmission is launched through row, has reached the effect expanding visual field.
In order to avoid light wave expands the expansion that there is dark space and can realize input picture between the image of group 7 output, two conditions must be had to be met:
One, the projected area of light wave output face 43 in lower-glass plane 52 that be coupled is half first time inciding the light wave overlay area area in lower-glass plane 52, namely satisfies condition:
2×S2＝S1
Wherein, S2 is the projected area of coupling light wave output face 43 in lower-glass plane 52, and S1 is light wave overlay area area first time inciding in lower-glass plane 52.
Two, the image light waves after coupling is between coboundary light wave and lower limb light wave, coboundary light wave after coupling reflexes to upper glass planar 51 through lower-glass plane 52, coboundary light wave forms the first incidence point on upper glass planar 51, lower limb light wave after coupling is refracted to lower-glass plane 52 through coupling light wave output face 43, lower limb light wave forms the second incidence point in coupling light wave output face 43, and the first incidence point is adjacent with the second incidence point position.
Light wave is after the collimation of collimation lens 3, and refraction enters light wave coupling input prism 4 obliquely, and light wave coupling input prism 4 ensures that light wave enters slab guide substrate 5 in total reflection.Due to the existence of collimation lens 3, make the oblique incidence of collimated light waves to the collimated light waves plane of incidence 41 of light wave coupling input prism 4.
Fig. 5 adopts convex lens as the light wave propagation schematic diagram of light wave coupling input prism in comparative example.
As shown in Figure 5, coupling input prism 204 is refracted into after the image light waves 202 that perspective display device 200 in comparative example only adopts common biconvex lens 203 to be sent by pointolite 201 collimates, light wave is totally reflected in light wave coupling input prism 204, light wave cannot enter slab guide substrate 205 and carry out total reflection transmission, thus do not have the effect of collimation lens in the present embodiment, therefore the existence of collimation lens 3 greatly facilitates collimated light waves and is directly incident in slab guide substrate 5.
As shown in Figure 2 and Figure 3, usually in optical design, with main shaft light wave for reference light wave carries out the determination of parameter, for making main shaft light wave meet above-mentioned transmission conditions, each parameters relationship meets:
α
sur1＝α
in＜45°
Wherein, α
inthe angle between coupling light wave output face 43 and the first reflecting surface 42, α
sur1it is the angle between coupling light wave output face 43 and lower-glass plane 52.For different decoupling calls, light wave coupling input prism can do corresponding rotation, and now drift angle becomes:
α'
in＝α
in+α
rotate
Wherein, α '
inthe angle after rotating between coupling light wave output face 43 and the first reflecting surface 42, α
rotatefor the angle that light wave coupling input prism 4 rotates.
When light path design, in order to keep key light wave line of propagation not to be changed when waveguide becomes input and output, therefore
α
out＝α
in
Wherein, α
outit is the angle between the second reflecting surface 61 and display plane 62.
Expand group 7 to make light wave and play the effect expanded, avoid there is dark space between the appearance of ghost image and display image simultaneously, light wave is expanded to the inclined angle alpha of group
sur2should meet:
α
sur2＞45°
Under the prerequisite meeting above-mentioned relation, work as α
sur1when=30 °,
α
in＝30°
α
out＝30°
α
sur2＝60°
With above-mentioned parameter designing waveguide device, collimated light waves refraction enters coupling input prism 4, and the slab guide substrate 5 that is coupled into through overcoupling input prism 4 is transferred to coupling output prism 6, directly enters light wave expand group 7 by coupling output prism 6 reflection coupling.Utilize mirror imaging principle because light wave expands group 7, each microprism unit 8 can export again the light signal from light source individually.For observer, the light wave of the image collected due to different angle views persons is different, cause observer can between see whole image frame, thus increase image planes and observe visual field.
Fig. 6 is the structural representation of the wearing display article including perspective display device in embodiments of the invention.
As shown in Figure 6, by perspective display device of the present invention being used for dress display article 300, real-time display is given to display module 10 on the one hand by the display information transmission from display light source 9, simultaneously because the assembly in the present embodiment does not adopt special diaphragm to stop entering of extraneous natural light completely, the change of outside scenery therefore can also be observed.
The effect of embodiment and effect
According to the perspective display device based on the waveguide of plane expansion optical that the present embodiment relates to, coupling input, output device using prism as light wave, coupling efficiency is high, and light-wave energy loss is few, output image picture advantage clearly; Adopt light wave to expand group in the present embodiment and expansion is positioned to light wave, therefore there are Large visual angle, display frame quality these outstanding advantages high.
Due in the perspective display device based on the waveguide of plane expansion optical that the present embodiment relates to, its assembly does not adopt special diaphragm to stop completely, and the perspective display device related to by the present embodiment that enters of extraneous natural light applies to wearable display article, both can watch the realtime graphic picture from display light source, can also external scene have been observed.
The perspective display device based on the waveguide of plane expansion optical that the present embodiment relates to only adopts collimation lens, coupling input prism, optical waveguide substrates, coupling output prism and light wave expand group, therefore, also there is compact conformation on the whole, small in volume based on the perspective display device of plane expansion optical waveguide in the present embodiment, the simple advantage of manufacturing process.
Certainly the perspective display device based on the waveguide of plane expansion optical involved in the present invention is not merely defined in structure described in the present embodiment.
Claims (9)
1., based on a perspective display device for plane expansion optical waveguide, it is characterized in that,
Comprise successively:
Display light source, for sending the image light waves needed for display;
Collimation lens, sends collimated light waves after collimating to described image light waves;
Light wave coupling input prism, sends coupling light wave after being coupled to described collimated light waves;
Slab guide substrate, carries out reflections propagate to described coupling light wave and forms the ejected wave that is all-trans;
Light wave coupling output prism, output display ripple after the described ejected wave that is all-trans is coupled;
Light wave expands group, carries out planar development to described disclosing solution,
Wherein, described collimation lens is arranged on described display light source and is coupled with described light wave and inputs between prism, described collimation lens collimates described image light waves, and make described collimated light waves incide described light wave coupling input prism with certain angle, described collimation lens adopts column prism, described collimation lens has light wave input face, light wave output face, described light wave input face is plane, described light wave output face is arc surface, described light wave input face aims at described image light waves, described light wave coupling input prism is aimed in described light wave output face, and the incident angle of light wave in described light wave output face that be coupled is less than the cirtical angle of total reflection, the image light waves received collimates by described collimation lens, by described light wave output face, the light wave after collimation is incided described light wave coupling input prism obliquely again,
Described light wave coupling input prism is connected to one end of described slab guide substrate, described collimated light waves is coupled in described slab guide substrate, make described coupling light wave formed in described slab guide substrate described in the ejected wave that is all-trans propagate,
Described light wave coupling output prism is connected to the other end of described slab guide substrate, and described total reflection Wave coupling is gone out described slab guide substrate, thus forms the described disclosing solution expanding group output to described light wave,
Described light wave expands group and is made up of row's prism unit, is connected on described light wave coupling output prism, launches affiliated disclosing solution.
2. perspective display device according to claim 1, is characterized in that:
Wherein, described slab guide substrate is made up of the upper glass planar be parallel to each other and lower-glass plane, and be all-trans described in described coupling light wave is formed between glass planar and described lower-glass plane on described ejected wave.
3. perspective display device according to claim 2, is characterized in that:
Wherein, described light wave coupling input prism has the collimated light waves plane of incidence, the output face of coupling light wave, the first reflecting surface, described first reflecting surface and the output face of coupling light wave form the first angle, and described first reflecting surface flushes with described upper glass planar, by described coupling light wave reflection to described slab guide substrate.
4. perspective display device according to claim 3, is characterized in that:
Wherein, described light wave coupling output prism has the second reflecting surface and display plane, and the second reflecting surface and described display plane form the second angle, described display plane and described lower-glass planes align, described light wave coupling output prism by after described total reflection Wave coupling by described display plane output display ripple.
5. perspective display device according to claim 4, is characterized in that:
Wherein, described light wave expands group to be had plane of incidence and launches plane, and described plane of incidence overlaps with described display plane, and described expansion plane carries out planar development to disclosing solution, expands visual field.
6. follow according to perspective display system according to claim 5, it is characterized in that:
Wherein, the described collimated light waves plane of incidence and the output face of coupling light wave are coated with anti-reflection film, and the first reflecting surface is coated with reflectance coating,
The described upper glass planar surface corresponding with described lower-glass plane is coated with reflectance coating,
Described second reflecting surface is coated with reflectance coating, and described display plane is coated with anti-reflection film.
7. follow according to perspective display system according to claim 5, it is characterized in that:
Wherein, the projected area of described coupling light wave output face in described lower-glass plane is half first time inciding the light overlay area area in described lower-glass plane;
Described coupling light ripple forms coboundary light wave and lower limb light wave, the described image light waves after coupling between described coboundary light wave and described lower limb light wave,
Described coboundary light wave after coupling is through described lower-glass plane reflection to described upper glass planar, and described coboundary light wave glass planar forms the first incidence point on described,
Described lower limb light wave after coupling is refracted to described lower-glass plane through the output face of described coupling light wave, and described lower limb light wave forms the second incidence point on the light wave output plane of described light wave coupling input prism,
Described first incidence point is adjacent with described second incidence point position.
8. follow according to perspective display system according to claim 4, it is characterized in that:
Wherein, the angle of described first angle and described second angle is equal.
9. follow according to perspective display system according to claim 5, it is characterized in that:
Wherein, following relation is met between the length L of the expansion plane of described single prism unit and the length S of described display plane:
S＝N×L
Wherein, quantity N >=10.
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| FI20045513A (en) * | 2004-12-31 | 2006-07-01 | Nokia Corp | Pen-type virtual display |
| JP2011039490A (en) * | 2009-07-17 | 2011-02-24 | Sony Corp | Image display device, head-mounted display, and light beam extending device |
| JP2011059444A (en) * | 2009-09-10 | 2011-03-24 | Olympus Corp | Spectacles-type image display device |
| JP5678460B2 (en) * | 2010-04-06 | 2015-03-04 | ソニー株式会社 | Head-mounted display |
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