CN110297387A - Screen and optical projection system - Google Patents
Screen and optical projection system Download PDFInfo
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- CN110297387A CN110297387A CN201810238988.3A CN201810238988A CN110297387A CN 110297387 A CN110297387 A CN 110297387A CN 201810238988 A CN201810238988 A CN 201810238988A CN 110297387 A CN110297387 A CN 110297387A
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Classifications
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/54—Accessories
- G03B21/56—Projection screens
- G03B21/60—Projection screens characterised by the nature of the surface
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Overhead Projectors And Projection Screens (AREA)
- Projection Apparatus (AREA)
Abstract
The invention discloses a kind of simple screen of structure with high contrast and high-gain and using the optical projection system of this screen.In the field range that projection ray from projector can be reflexed to viewer by the screen.The screen includes at least transparent substrate layer, total reflection layer and the light-absorption layer being cascading from the incident side of the projection ray.The light-absorption layer can absorb the light that the light-absorption layer is reached through the transparent substrate layer and the total reflection layer.The total reflection layer includes multiple microstructure units, there are two intersecting planes for the microstructure unit tool, the multiple microstructure unit constitutes broached-tooth design, and the total reflection layer can penetrate environment light, and be emitted at least partly described projection ray after being totally reflected.Micro-structure diffusion layer is provided at least one plane in described two intersecting planes of the microstructure unit.
Description
Technical field
The present invention relates to screen areas.In particular it relates to which a kind of structure with high contrast simply projects
Screen and optical projection system.
Background technique
In recent years, with the continuous improvement of projector's brightness, large-sized projection display system is widely used.For example,
Advantage of the projection display system in the application of large scale home theater increasingly embodies out.Compared to traditional LCD TV, throw
Shadow system overall dimensions are small, are easily installed and store, and whole system price is low, and can easily realize the display greater than 100 cun
Picture.
In projection display system, other than projector, projection screen be product most-often used in peripheral equipment it
One.In the Projection Display of projection screen, picture contrast is to evaluate an important parameter of screen-picture quality.In general, throwing
The contrast of shadow machine can achieve it is thousands of compare one, but actual in use, environment light can produce the contrast of screen-picture
Raw stronger influence, so that contrast degradation, greatly influence viewing experience.Therefore, it is necessary to be reduced by technological means
Environment light adversely affects Projection Display bring, makes projected picture contrast with higher, promotes display quality.
For example, proposing one kind in the Chinese patent application of Publication No. CN105408777A as shown in a and b of Fig. 1
The Fresnel optical screen structure of circular symmetry.The screen adds the technical solution of light-absorption layer using array microstructure.It should
The array microstructure of screen is made of lens face 32 and non-lens surface 33.Lens face 32 and the angle of screen plane are less than non-lens
The angle in face 33 and screen plane, the incident ray L1 of projector are only incident on the lens face 32 with small angle.It is incident on
Light on lens face 32 is to reflex to sight by by the reflecting layer 20 that the multiple metallic films 25 being laminated on the surface thereof are constituted
The person of seeing side.Although the incident ray of projector can be reflected into the eyes of spectators by the screen, specular layer 20 can not be kept away
Exempt from ground while can also reflect the light from other direction incidences, such as the veiling glare in environment, so projection screen can not be greatly improved
The contrast of curtain.In order to improve the contrast, it is also necessary to add one layer of coloring layer 42 in the viewer side of array microstructure.Coloring layer
42 absorb veiling glare, but also absorb part projection ray.Therefore, although improving the contrast of screen, entire throwing is reduced
The optical efficiency of shadow system is equivalent to and is compromised between contrast and optical efficiency.The use of volume production currently on the market
The screen gain that the projection screen of the structure can be realized is only about 0.9~1.1.
In addition, as shown in Fig. 2, the Chinese patent application in Publication No. CN1954260A also proposed a kind of radiation shield
Curtain.The reflective viewing screen 10, which is provided with basal part 11, light transmissive portion 12, reflecting layer 13 and light absorption department 14, can make from image source L
Image light L1, L2 of projection reflect, meanwhile, it is capable to make the outside of room lighting G from the top for being set to radiation shield 10 etc.
Light G1, G2 are absorbed by light absorption department 14.In addition, reflective viewing screen is additionally provided with previous processed layer 15.Previous processed layer 15 can root
According to need select setting, thus realize anti-dazzle light processing, scattering processing, antireflection process, anti-on-line treatment, hard conating process,
The various technical effects such as antifouling process.
As it can be seen that in the above prior art, on the one hand, be difficult to effectively while providing optical gain and the comparison of screen
Degree, on the other hand, existing screen generally have multilayered structure, and structure is complicated, causes at high cost and yield rate lower.
Summary of the invention
In view of the above-mentioned problems, present invention contemplates that providing one kind has both high contrast and high screen gain, and structure it is simple,
The screen and optical projection system of low cost.
First embodiment according to the present invention provides a kind of screen.The screen can be by the projected light from projector
In line reflection to the field range of viewer.The screen is included at least and is cascading from the incident side of the projection ray
Transparent substrate layer, total reflection layer and light-absorption layer.The light-absorption layer can be absorbed through the transparent substrate layer and described is all-trans
The light that layer reaches the light-absorption layer is penetrated, the total reflection layer includes multiple microstructure units, and there are two the microstructure unit tools
Intersecting plane, the multiple microstructure unit constitute broached-tooth design, and the total reflection layer can penetrate environment light, and make at least
The part projection ray is emitted after being totally reflected.At least one in described two intersecting planes of the microstructure unit
Micro-structure diffusion layer is provided in a plane.
Preferably, the difference of the refractive index of the micro-structure diffusion layer and the totally reflected refractive index is not more than 0.1.
Preferably, the micro-structure diffusion layer is provided on described two intersecting planes of the microstructure unit.
Preferably, the thickness of the micro-structure diffusion layer is less than 50 microns.
For example, the micro-structure diffusion layer is formed and carrying out blasting treatment on the total reflection layer.It can replace
Dai Di, the micro-structure diffusion layer are the glue transfers being formed on the total reflection layer by die surface roughening treatment
Structure.Alternatively, the micro-structure diffusion layer is by the spraying when carrying out smooth treatment to the totally reflected surface
Glue with scattering particles and formed.
The total reflection screen can also include la m, and the la m is located at the total reflection layer and the light-absorption layer
Between, the la m has the laciniation to match with the totally reflected microstructure unit, described to be all-trans
Penetrate the refractive index n of layer1With the refractive index n of the la m2Meet relationship: n2<n1-0.2。
Each microstructure unit is arranged to the total reflection prism of rotational symmetry, and two intersections of the microstructure unit are flat
The angle of the plane of face and the screen is respectively θ1And θ2, and θ1And θ2Meet relationship: θ1+θ2< 90.For example, multiple described
In microstructure unit, each θ1With different angles and each θ2It is equal to 45 degree.Alternatively, in multiple micro-structures
In unit, each θ1With different angles, and each θ2Also there is different angles.
Preferably, described two intersecting planes are provided so that the projection ray in described two intersecting planes
It advances after being totally reflected in one plane along the direction parallel with the plane of the screen.
Preferably, plane of the center of rotation axis of multiple microstructure units of rotational symmetry perpendicular to the screen
And it is located at the lower section of the screen.
Second embodiment according to the present invention provides a kind of optical projection system.The optical projection system includes projector and above-mentioned
Screen.
As described above, screen according to the present invention and optical projection system at least have the advantage that
1, simplify the structure of projection screen, it is only necessary to by the way that the bilayer letter including optical functional layer and black light-absorption layer is arranged
Single structure can be realized as improving the technical effect of gain and contrast；
2, compared to thick and heavy scattering film is separately provided, the scattering material being set in the microstructure unit of optical functional layer
Layer is more frivolous and is easier to process, and reduces costs, improves yield rate；
It 3, both can be by the projection ray from projector and from environment by the design to optical functional layer angle
Ambient light distinguishes, and improves the contrast of screen, and projection ray can be reflexed to the visual field of spectators with certain angle of scattering
In, increase the field angle of projection screen.
It should be appreciated that beneficial effects of the present invention are not limited to said effect, and can be described herein any beneficial
Effect.
Detailed description of the invention
Fig. 1 is to show the exemplary schematic diagram of projection screen in the prior art；
Fig. 2 is to show another exemplary schematic diagram of projection screen in the prior art；
Fig. 3 is to show the structural schematic diagram of optical projection system according to an embodiment of the present invention；
Fig. 4 is to show the rotational symmetry structure of the optical functional layer of total reflection screen according to an embodiment of the present invention
Schematic diagram；
Fig. 5 is to show the cross section structure of the microstructure unit of optical functional layer of screen according to an embodiment of the present invention to show
It is intended to；
Fig. 6 is to show the signal of the optical principle of the micro-structure of optical functional layer of screen according to an embodiment of the present invention
Figure；
Fig. 7 is to show the signal of the selection of the optical tilt of microstructure unit of screen according to an embodiment of the present invention
Figure；
Fig. 8 is to show the simulative example of the optical angle of microstructure unit of screen according to an embodiment of the present invention；
Fig. 9 is to show the choosing of the Refractive Index of Material of optical functional layer and light-absorption layer of screen according to an embodiment of the present invention
Select range schematic diagram；
Figure 10 is to show the schematic diagram of the micro-structure diffusion layer of screen according to an embodiment of the present invention；
Figure 11 shows the scatter distributions of screen according to an embodiment of the present invention and the simulation results of screen gain；
Figure 12 shows the scatter distributions of screen according to an embodiment of the present invention and the simulation results of screen gain；
Figure 13 shows the scatter distributions of the screen of embodiment according to the present invention and the simulation results of screen gain；
Figure 14 shows the simulation results of the optical contrast of screen according to an embodiment of the present invention.
Specific embodiment
Each specific embodiment according to the present invention is described in detail next, with reference to attached drawing.It is emphasized that in attached drawing
All sizes are only illustrative and are not necessarily according to actual proportions diagram, because without limited.For example, should
Understand, in the multilayered structure of the projection screen illustrated the thickness of each layer and thickness proportion be not according to actual size and
Than what is exemplified, merely to diagram is convenient.
One, total reflection optical projection system is summarized
Fig. 3 is to show the structural schematic diagram of optical projection system according to an embodiment of the present invention.As shown in Figure 3, projection system
System includes screen 10 and projector 20.Screen 10 includes the light-absorption layer 11 and optical functional layer 12 being cascading, optics function
Ergosphere 12 is located at the incident side of the projection ray of projector relative to light-absorption layer 11.Hereinafter, also by the projected light of screen 10
The incident side of line is known as the outside (that is, towards viewer) of screen, and light-absorption layer side is known as the inside of screen (that is, backwards to seeing
Many sides).Optical functional layer 12 is formed with microstructure unit array.Each microstructure unit includes two clinoplains.This two
The tilt angle of a clinoplain is by accurate design, so that at least most of projection ray 31 incident from 10 lower section of screen
It is totally reflected at two clinoplains, eventually becomes the emergent ray 33 in the field range for being reflected onto viewer, and
The angle of 32 overwhelming majority of environment veiling glare above screen 10 is unable to satisfy total reflection condition and penetrates the optics function
Ergosphere 12 is absorbed by light-absorption layer 11.That is, at least partly being absorbed through the environment light of the optical functional layer by light-absorption layer.Its
In, the light absorbent of the light-absorption layer 11 containing black.
Optical functional layer 12 includes multiple microstructure units, wherein each microstructure unit is preferably the cross with triangle
Cross section structure may also include the structure of other shapes, such as: two-dimensional structure is trapezium structure.
As shown in figure 4, the microstructure unit of optical functional layer 12 is in screen plane with the array arrangement of rotational symmetry
Structure.Rotation center (optical centre) the axis normal to screen plane of the array arrangement structure of the rotational symmetry and be located at screen
Lower section.Preferably, projector 20 is arranged in the center of rotation axis.
Further, setting protective layer can also be added in the outside of optical functional layer 12 to prevent scratch or chemistry rotten
Erosion, the protective layer can be polyimides (PI) film, polyester (PET) film, poly- naphthalene ester (PEN) film, polyvinyl chloride (PVC) film, gather
The one or more of carbonic ester (PC) film or liquid crystal polymer (LCP) film, glass plate, PC plate, cloth etc., such as on glass plate
Poly- naphthalene ester (PEN) film.It is, of course, also possible to which other auxiliary functional layers are arranged according to the design needs.
The cross section structure that Fig. 5 shows the microstructure unit of the optical functional layer 12 of screen according to an embodiment of the present invention shows
It is intended to.Shown in institute Fig. 5, optical functional layer 12 includes transparent substrate layer 120, total reflection layer 121 and the la m being stacked
122.Transparent substrate layer 120 is located at the outermost of optical functional layer 12, wherein the transparent substrate layer 120 include PET, PC or
The transparent materials such as PMMA.The side opposite with light incident side of transparent substrate layer 120 is arranged in total reflection layer 121.Wherein, described
Total reflection layer 121 uses resin material, and the resin is usually epoxide-resin glue system, acrylic adhesive system, polyester adhesive system, poly- ammonia
Ester gum system or polyimides glue system etc..Transparent substrate layer 120 and total reflection layer 121 pass through UV coating apparatus or thermal forming device
Form one.La m 122 is formed in the side of the close light-absorption layer 11 of total reflection layer 121, and is in contact with light-absorption layer 11.
The refractive index for forming the material of la m 122 is lower than the refractive index for forming the material of total reflection layer 121.Total reflection layer 121 is arranged
There are multiple microstructure units.Wherein, in each microstructure unit, total reflection layer 121 be formed total reflection prism and
There are two inclined intersecting planes 124 and 125 for tool.In other words, it in each microstructure unit of total reflection layer 121, is all-trans
The prism that layer 121 is the row's rotational symmetry formed on the surface of transparent substrate layer 120 is penetrated, intersection surface 124 and 125 is complete
Interface between reflecting layer 121 and both the different material layers of la m 122, wherein total reflection layer 121 is first material layer,
The la m 122 is second material layer.In cross section described in Fig. 5, total reflection layer 121 and la m 122 all have saw
The structure of dentation.For example, such prism is by being used in transparent substrate layer 120 to coating resin and UV solidification or thermosetting
Chemical industry skill is process.It is clear in order to illustrate in Fig. 5, illustrate only two microstructure units.Projection below screen
Primary total reflection occurs respectively at two inclined surfaces 124 and 125 for the incident ray 31 of machine, is finally reflected into the eye of viewer
Eyeball direction becomes the emergent ray 33 of screen 10.Environment veiling glare 32 mostlys come from the ceiling light in room.In most situations
Under, the rotation axis of the rotational symmetry structure of microstructure unit of the ceiling light far from the screen and incidence angle of environment veiling glare 32 is far small
In the incident angle of projection ray.Therefore, environment veiling glare 32, which is unable to satisfy, is totally reflected on surface 124 and surface 125
Condition, the overwhelming majority have penetrated microstructure unit and have been absorbed by light-absorption layer 11.Since light-absorption layer 11 is integrally provided at optics function
The inside of ergosphere 12 so manufacturing process is simple, and not will lead to projection ray's loss.Wherein, la m 122 can be air
Or quartzy or glass.
In addition, as shown in figure 5, screen according to an embodiment of the present invention 10 is gone back in the microstructure unit of total reflection layer 121
It is provided with micro-structure diffusion layer 123.Two inclinations of the microstructure unit of total reflection layer 121 are arranged in micro-structure diffusion layer 123
122 side of la m of plane 124 and 125.For example, the back of two clinoplains 124 and 125 in microstructure unit can be passed through
Face processing diffusion micro-structure or plating irregular scattering film, to form micro-structure diffusion layer 123.Micro-structure diffusion layer
123 for being totally reflected incident projection ray 31 at the clinoplain of total reflection layer 121 while, additionally it is possible to expanded
It dissipates.The refractive index of micro-structure diffusion layer 123 and the refractive index of total reflection layer 121 are close, and the difference of the two is less than or equal to 0.1.It is excellent
Selection of land, the thickness of micro-structure diffusion layer 123 is less than 50 microns.Through this structure, screen 10 according to an embodiment of the present invention
It is not necessary that individual diffusion layer is additionally arranged in screen surface as screen in the prior art, but make total reflection layer 121
Microstructure unit has both light diffusion function, to simplify the structure of screen.
As described above, the angle Selection sexual reflex that optical functional layer 12 is utilized in screen 10 according to an embodiment of the present invention is special
Property, enable screen automatic distinguishing projection ray and ambient light, and the light-absorption layer 11 for absorbing environment veiling glare is whole
The inside of optical functional layer 12 is arranged in ground, to realize high contrast, the optical characteristics of high-gain.In addition, complete by making
The microstructure unit in reflecting layer has both light diffusion function, simplifies device architecture, reduces costs, improve yield rate.
Two, the optical principle and angle Selection of microstructure unit are totally reflected
Fig. 6 illustrates the optical principle of the total reflection microstructure unit of screen according to an embodiment of the present invention.Such as Fig. 6 institute
Show, the refractive index of total reflection layer 121 is n1Refractive index with la m 122 is n2, two inclined-planes and screen of microstructure unit are put down
The angle in face (that is, vertical direction) is respectively θ1And θ2(unit is degree, similarly hereinafter).Incident ray and reflection light and horizontal direction
Angle be respectively α and β (unit is degree, similarly hereinafter).Wherein, when reflection light horizontal exit, β is obviously 0 degree, and is set
Fixed: when reflection light below horizontal line (that is, being biased to ground), β is negative value, when reflection light above the horizon (that is, partially
To ceiling) when β be positive value.After making the incident ray from projector 20 occur to be totally reflected twice on two inclined surface
It is emitted towards the eyes direction of viewer, according to geometric optical theory and optical total-reflection condition, it is necessary to meet following public affairs
Formula (1)~(3):
θ can not be determined completely based on above-mentioned formula (1)~(3)1And θ2Value, also there are certain design freedoms.It is false
If the angle of intermediate rays and screen plane (that is, vertical direction) between incident ray and emergent ray is γ, and is set
When intermediate rays are biased to viewer side, γ is positive value, and when intermediate rays are biased to far from viewer side, γ is negative value.Then according to geometry
Optical principle and optical total-reflection condition can calculate:
By formula (4) and (5) as long as it is found that having determined the optical path of incident ray, emergent ray and intermediate rays (that is, really
Determine α, β and γ), so that it may the tilt angle theta of two intersecting planes of micro-structure is determined completely1And θ2。
In addition, being also known by formula (4) and (5), even if the case where the optical path of incident ray, emergent ray has been determined
Under, can also according to different application demands, by adjusting intermediate rays optical path (that is, value of adjustment γ) in a certain range
It is interior to θ1And θ2Value selected.For example, projector is located at the lower section of screen in the application of ultrashort out-of-focus projection, so α >
0 always sets up；And the eyes of spectators are located at the top of projector, in order to guarantee that emergent ray is incident to spectators' eyes, so alpha+beta
> 0 also always sets up；In the case, available by formula (1):
θ1+θ2< 90 (6)
By formula (4) it is found that in the application of ultrashort out-of-focus projection, two of the microstructure unit of screen according to the present invention
Angle between inclined surface 124 and 125 is necessary for obtuse angle.
A kind of ideal optical path situation is shown in a of Fig. 7, wherein incident projection ray Vin passes through microstructure unit
An inclined-plane total reflection after intermediate rays Vmid in total reflection layer 121 along the direction row parallel with screen plane
Into Vmid becomes the outgoing towards viewer direction horizontal exit after the total reflection by another inclined-plane of microstructure unit
Light Vout.
Shown in a of Fig. 7, at this point, θ is worked as in γ=0 degree, β=0 degree2=45 degree, emergent ray along with
Outgoing, that is, β=0 degree of screen vertical, then according to θ known to above-mentioned formula (6)1< 45 degree namely θ1<θ2。
But in practical applications, it is also possible to there is the such as b and c of Fig. 7 and show nonideal optical path situation.In the b of Fig. 7
In, incident ray Vin produces intermediate rays Vmid, but the traveling of Vmid after the total reflection on the first inclined-plane of microstructure unit
Direction is not parallel to screen plane, but is partial to viewer side (γ is positive value at this time).Therefore, part Vmid may not be by
Second slant reflection and be directly emitted, be unable to fully the first inclined-plane using microstructure unit.In the c of Fig. 7, incident ray
Vin produces intermediate rays Vmid after the total reflection on the first inclined-plane of microstructure unit, but the direction of travel of Vmid is not parallel
In screen plane, but it is partial to backwards to the side of viewer (γ is negative value at this time).Therefore, it is impossible to make full use of micro-structure list
Second inclined-plane of member.
In addition, and including multiple micro-structure lists as described above, screen according to the present invention 10 has rotational symmetry structure
Member.Therefore, the angle design of each microstructure unit can be same or different.For example, Fig. 8 is illustrated according to the present invention
Screen microstructure unit optical angle simulative example.The focus of screen shown in a of Fig. 8 is located at infinite point,
I other words in all microstructure units of screen, the emergent ray horizontally direction of directive viewer, so β=0 degree and
θ2=45 degree are set up always.According to analog result it is found that the θ of microstructure unit1It is gradually reduced with the top of close screen,
And θ1<θ2, thus meet above-mentioned formula (6).In the screen shown in the b of Fig. 8, the focus of screen is no longer at infinite point.?
In this case, along the direction from the center of screen to screen edge, the θ of the microstructure unit of screen1Value constantly reduce
And θ2Value constantly increase.
Three, it is totally reflected the refractive index selection of microstructure unit
In addition to θ1And θ2Value except, by optical total-reflection formula it is found that meeting the total reflection micro-structure that is totally reflected twice
Unit is also by the refractive index n of total reflection layer 1211With the refractive index n of la m 1222Influence.Screen according to the present invention
Total reflection layer 121 is usually made of transparent resin material, and refractive index is in the range of 1.3~1.7.Alternatively, total reflection
Layer 121 also can be used the other materials with similar refractive index and be made.Furthermore it is also possible in the material that total reflection layer 121 is made
Scattered ion(s) or absorbing material etc. are adulterated in material.Thus, in order to meet the condition of total reflection, need to consider the folding of la m 122
Penetrate rate n2Selection.Fig. 9 shows the different refractivity n of la m 1222Total reflection for the incident ray of microstructure unit
The influence in region.As shown in a of Fig. 9, incident ray V can be expressed as (Vx,Vy,Vz), wherein z-axis normal to screen, and X, Y
Axis is parallel to screen.Obviously, the total reflection region of incident ray depends on VxAnd VyValue range.VzMeet:
It is assumed that emergent ray is towards the eyes of viewer and the refractive index n of total reflection layer 1211It is 1.6, according to above-mentioned formula
(2) and (3) can obtain the component (V for meeting the incident ray of total reflection conditionx,Vy) value range with la m 122 folding
Penetrate rate n2Variation tendency.As shown in the b of Fig. 9, with n2Increase, satisfaction occur entirely on two inclined-planes of microstructure unit
It constantly reduces in the region of the incident ray of reflection.In other words, with n2Increase, from projector issue light can not be in micro- knot
Two inclined-planes of structure unit occur the probability being totally reflected twice and increase.Therefore, it in order to guarantee certain screen reflection efficiency, needs
Make n1And n2Meet:
n2<n1-0.2 (8)
It should be appreciated that la m 122 can be air layer in the case where meeting above-mentioned condition.
Four, the example of micro-structure diffusion layer
As described above, micro-structure diffusion layer is arranged in totally reflected outside in order to increase the visual range of projected picture
123.It is shown in Fig. 5 and is provided with micro-structure expansion at the back side of two intersecting planes of the microstructure unit of total reflection layer 121
Dissipate the example of layer 123.However, the invention is not limited thereto.As shown in Figure 10, it can according to need selection micro-structure diffusion layer 123
Specific setting position in microstructure unit.The a of Figure 10 is shown a case that with similar in Fig. 5, by microstructure unit
Two intersecting planes on micro-structure diffusion layer 123 is all set, can be realized field angle it is bigger light output.The b of Figure 10 shows
The example of micro-structure diffusion layer 123 is gone out to be arranged on the upper side plane in two intersecting planes of microstructure unit.In this feelings
Under condition, the angle of flare of the emergent ray in vertical screen direction is equal to the expansion for being used to form the diffusion material of micro-structure diffusion layer 123
Dissipate angle.The c of Figure 10 shows the setting micro-structure diffusion layer 123 on the underside plan in two intersecting planes of microstructure unit
Example.
Micro-structure diffusion layer 123 can for example be obtained by following three kinds of modes: 1. carry out on totally reflected surface
Blasting treatment；2. forming glue by die surface roughening treatment on totally reflected surface and transferring structure；3. being all-trans
When penetrating the surface progress smooth treatment of layer, the glue with particle is sprayed.
Five, the simulation result of the performance of screen
Figure 11 to Figure 13 respectively illustrates the scatter distributions of the screen of embodiment according to the present invention and imitating for screen gain
True analog result.
Figure 11 illustrate use 15 degree Gauss scatter film as light diffusion layer in the case where screen to projector
The analogue simulation of the reflection of light.The a of Figure 11 shows distribution of the projection ray of screen reflection in full filed, the b of Figure 11
Show the screen gain of screen.By a of Figure 11 it is found that most of light from projector is all concentrated on close to screen center
Round effective viewing field region in；Fraction light is reflected onto the direction of ceiling because of the Fresnel reflection of screen surface.
By the b of Figure 11 it is found that in the case where 20 degree of gain angles, the level of peak gain 5.5 may be implemented.Figure 12, which is illustrated, to be used
Analogue simulation of the screen to the reflection of ambient light in the case that 15 degree of Gauss scatters film as light diffusion layer.Simulation result
Show that most of ambient light is absorbed through after optical functional layer by the light-absorption layer of black, only fraction ambient light is because of screen
The Fresnel reflection on surface and the direction for being reflected onto ground.Thus, only extremely least a portion of ambient light can enter viewing
In the effective viewing field of person, therefore the contrast of projected picture will not be impacted.
In actual application scenarios, the horizontal view angle that spectators watch screen is greater than vertical angle of view.Therefore using oval high
The scattering film of this scatter distributions can effectively increase the horizontal dispersion distribution of the reflected beams as light diffusion layer, to increase
The utilization rate of reflected light.The simulation result of Figure 13 shows that the screen using elliptical Gaussian Profile scattering film can will shield
The horizontal view angle of curtain is expanded to 35~40 degree, and vertical angle of view is in the range of 20 degree, and the peak value of gain still can be up to 3~
5 or higher.
Figure 14 shows the simulation results of the contrast carried out to screen according to the present invention.As shown in a of Figure 14,
Screen is divided into several regions, and on the screen in the projector being located at below screen and parlor ceiling light above screen
The contrast of wherein 9 points is tested in the identical situation of illumination.As shown in the b of Figure 14, what simulation result displayed contrast is averaged
Value can be higher than 20, considerably beyond the level of projection screen currently on the market.In the case where actual use, projector
Projection ray's illumination on the screen can be greater than the illumination of environment light.Thus, with the increase of the illumination of projection ray, relatively
It can also be further increased in the contrast of environment light, can satisfy family's projection and commercial projection completely to projected picture contrast
Demand.
Although above, with reference to the accompanying drawings of screen according to the present invention and optical projection system, the present invention is unlimited
In this, and it will be understood by those skilled in the art that the spirit or scope limited without departing from appended claim of the present invention feelings
Under condition, various changes, combination, secondary combination and modification can be made.
Claims (12)
1. a kind of screen, in the field range that the projection ray from projector can be reflexed to viewer, feature exists
In, the screen include at least the transparent substrate layer being cascading from the incident side of the projection ray, total reflection layer and
Light-absorption layer,
The light-absorption layer can absorb the light that the light-absorption layer is reached through the transparent substrate layer and the total reflection layer,
The total reflection layer includes multiple microstructure units, and there are two intersecting planes for the microstructure unit tool, the multiple micro-
Structural unit constitutes broached-tooth design, and the total reflection layer can penetrate environment light, and at least partly described projection ray is made to exist
It is emitted after being totally reflected, and
Micro-structure diffusion layer is provided at least one plane in described two intersecting planes of the microstructure unit.
2. screen as described in claim 1, which is characterized in that the refractive index of the micro-structure diffusion layer and the total reflection layer
Refractive index difference be not more than 0.1.
3. screen as described in claim 1, which is characterized in that be all provided on described two intersecting planes of the microstructure unit
It is equipped with the micro-structure diffusion layer.
4. screen as claimed in claim 1 or 2, which is characterized in that the thickness of the micro-structure diffusion layer is less than 50 microns.
5. screen according to claim 4, which is characterized in that the micro-structure diffusion layer is by the total reflection layer
Upper progress blasting treatment and formed；Or
The micro-structure diffusion layer is the glue transfer being formed on the total reflection layer by die surface roughening treatment
Structure；Or
The micro-structure diffusion layer is that have scattering grain by spraying when carrying out smooth treatment to the totally reflected surface
Son glue and formed.
6. screen according to claim 1 or 2, which is characterized in that the total reflection screen further includes la m, described interior
Between the total reflection layer and the light-absorption layer, the la m has and the totally reflected micro-structure side layer
The laciniation that unit matches, the totally reflected refractive index n1With the refractive index n of the la m2Meet relationship: n2
<n1-0.2。
7. screen according to claim 1 or 2, which is characterized in that each microstructure unit is arranged to rotational symmetry
The angle of total reflection prism, the plane of the two intersecting planes and screen of the microstructure unit is respectively θ1And θ2, and θ1
And θ2Meet relationship: θ1+θ2< 90.
8. screen according to claim 7, which is characterized in that in multiple microstructure units, each θ1With not
Same angle and each θ2It is equal to 45 degree.
9. screen according to claim 7, which is characterized in that in multiple microstructure units, each θ1With not
Same angle, and each θ2Also there is different angles.
10. screen according to claim 7, which is characterized in that described two intersecting planes are provided so that the throwing
Shadow light be totally reflected in a plane in described two intersecting planes after along parallel with the plane of the screen
Direction advance.
11. screen according to claim 7, which is characterized in that the rotation of multiple microstructure units of rotational symmetry
Plane of the central axis upright in the screen and the lower section positioned at the screen.
12. a kind of optical projection system, the optical projection system includes projector and the screen as described in any one of claims 1 to 11
Curtain.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810238988.3A CN110297387A (en) | 2018-03-22 | 2018-03-22 | Screen and optical projection system |
| PCT/CN2018/113877 WO2019179124A1 (en) | 2018-03-22 | 2018-11-05 | Screen and projection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810238988.3A CN110297387A (en) | 2018-03-22 | 2018-03-22 | Screen and optical projection system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110297387A true CN110297387A (en) | 2019-10-01 |
Family
ID=67986769
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810238988.3A Pending CN110297387A (en) | 2018-03-22 | 2018-03-22 | Screen and optical projection system |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN110297387A (en) |
| WO (1) | WO2019179124A1 (en) |
Cited By (3)
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| CN110618574A (en) * | 2018-06-19 | 2019-12-27 | 深圳光峰科技股份有限公司 | Light source module and projection device thereof |
| WO2021169597A1 (en) * | 2020-02-28 | 2021-09-02 | 深圳光峰科技股份有限公司 | Transparent projection screen, and manufacturing method for same |
| CN113467178A (en) * | 2021-07-20 | 2021-10-01 | 安波福电子(苏州)有限公司 | Projection film and projection system |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112180673B (en) * | 2019-07-05 | 2023-06-16 | 深圳光峰科技股份有限公司 | Projection screen |
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Also Published As
| Publication number | Publication date |
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| WO2019179124A1 (en) | 2019-09-26 |
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Application publication date: 20191001 |