CN109388014A - Projection screen and optical projection system - Google Patents
Projection screen and optical projection system Download PDFInfo
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- CN109388014A CN109388014A CN201710663024.9A CN201710663024A CN109388014A CN 109388014 A CN109388014 A CN 109388014A CN 201710663024 A CN201710663024 A CN 201710663024A CN 109388014 A CN109388014 A CN 109388014A
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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
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- Physics & Mathematics (AREA)
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- Overhead Projectors And Projection Screens (AREA)
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Abstract
本发明公开了一种投影屏幕，其能够将投影光线反射至观看者的视场范围内，所述投影屏幕包括从所述投影光线的入射侧依次布置的光扩散层、全反射层和光吸收层，所述光吸收层能够吸收入射的光线，所述光扩散层用于增大出射的光线的发散角，所述全反射层至少包括位于所述光扩散层侧的微结构层和位于所述光吸收层侧的内侧层，所述微结构层的折射率大于所述内侧层的折射率，所述微结构层上设置有多个微结构单元，多个所述微结构单元在所述投影屏幕的平面内连续延伸并且旋转对称，通过巧妙地设置全反射层的微结构，能够使来自超短焦投影机的投影光线和来自长焦投影机的投影光线均能够在微结构中经连续两次全反射而出射，使得一块屏幕能够兼用于超短焦投影机和长焦投影机。
The invention discloses a projection screen capable of reflecting projection light into the field of view of a viewer, the projection screen comprising a light diffusion layer, a total reflection layer and a light absorption layer arranged in sequence from the incident side of the projection light , the light absorbing layer can absorb the incident light, the light diffusing layer is used to increase the divergence angle of the outgoing light, and the total reflection layer at least includes a microstructure layer on the side of the light diffusing layer and a microstructure layer on the side of the light diffusing layer. The inner layer on the side of the light absorption layer, the refractive index of the microstructure layer is greater than the refractive index of the inner layer, the microstructure layer is provided with a plurality of microstructure units, and the plurality of the microstructure units are projected on the projection The screen continuously extends in the plane and is rotationally symmetrical. By skillfully setting the microstructure of the total reflection layer, both the projection light from the ultra-short-throw projector and the projection light from the long-throw projector can pass through two continuous lines in the microstructure. Subtotal reflection and exit, so that a screen can be used for both ultra-short-throw projectors and long-throw projectors.
Description
Technical field
The present invention relates to projection screens and optical projection system.In particular it relates to which one kind being capable of environment resistant light and energy
Enough it is suitable for the multifocal section of optical projection system with projection screen and the use projection screen of long focus projector and ultra short focal projector.
Background technique
In recent years, with the continuous improvement of projector's brightness, projection display system is in the application of large scale home theater
Advantage starts to embody.Compared to LCD TV and OLED TV, the size of projection display system is small, is easily installed, can be light
Pine nut is now greater than 100 cun of display picture, and whole system price is relatively low.
Traditional projector is referred to as long focus projector, and the picture that this projector projects 80 cun on the screen usually needs
Want 3 meters or more of distance, transmitted ray on the screen, therefore is also known as delivering directly projector with the incident angles of very little.By
Limited in the interior space, long focus projector is often difficult to transmit big projected picture indoors, then short focus even ultrashort coke
Projector comes into being.Ultra short focal projector on the market can transmit 80 cun or more of picture in the distance within 1 meter at present
Face.Due to distance and position difference that long focus projector and ultra short focal projector are put relative to screen, so needing to have not
The screen of same optical texture, causes one piece of screen that can not be shared by long focus projector and ultra short focal projector, increases user
Use cost, reduce space utilization rate.
In addition, projection display system is often installed in parlor in family's application environment.Parlor usually has well
Natural lighting condition and bright lighting source, thus there are a large amount of environment veiling glares.General projector screen can
The light of reflective projector also can reflection environment light light.In this environment, due to being affected by ambient light, through throwing
Contrast of the contrast for the picture that the light of shadow screen reflection is formed well below projector itself.In order to improve there are rings
Display Contrast in the case where the light of border, at present the projection screen of environment resistant light all use array microstructure add reflection layer or
The method of light absorbing layer is realized.
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 for ultra short focal projector.The screen adds light using array microstructure
The technical solution of absorbed layer.The array microstructure of the screen is made of lens face 32 and non-lens surface 33.Lens face 32 and screen
The angle of plane is less than the angle of non-lens surface 33 and screen plane, and the incident ray of projector is only incident on small angle
On lens face 32.The light being incident on lens face 32 is constituted by by the multiple metallic films 25 for being laminated on the surface thereof
Reflecting layer 20 reflexes to viewer side.Although the incident ray of projector can be reflected into the eyes of spectators, mirror by the screen
Face reflecting layer 20 can inevitably while also reflect the light from other direction incidences, such as the veiling glare in environment, so nothing
Method greatly improves the contrast of projection screen.In order to improve the contrast, it is also necessary to add one in the viewer side of array microstructure
Layer coloring layer 42.Coloring layer 42 absorbs veiling glare, but also absorbs part projection ray.Therefore, although improving the comparison of screen
Degree, but the optical efficiency of entire optical projection system is reduced, it is equivalent to and is compromised between contrast and optical efficiency.At present
The screen gain that can be realized using the projection screen of the structure of volume production is only about 0.9~1.1 in the market.
A kind of reflection for ultra short focal projector is disclosed in the Chinese patent application of Publication No. CN1670618A
Formula screen, the reflective viewing screen have the micro-structure as shown in a of Fig. 2.The unit of the micro-structure is made of two inclined-planes, by white
The inclined-plane 3 that the reflection resin of color is formed is towards projector, and for reflecting the light from projector, chamfered surface upward is applied
There is the light absorbing layer 4 of black, for absorbing incident ambient light above screen.Publication No. CN1693989A Chinese patent
Screen disclosed in application is also for ultra short focal projector and there is similar structure to constitute micro- knot as shown in the b of Fig. 2
The base material of structure is light absorbing material, is reflected coated with white resin layer 6 from projector in chamfered surface directed downwardly
Light.In addition, the Chinese patent application of Publication No. CN1954260A proposes a kind of radiation shield for long focus projector
Curtain.As shown in the c of Fig. 2, light absorption department 14 and reflecting layer 13 form the micro-structure with isosceles trapezoid section, and environment light is inhaled by light
Receipts portion 14 absorbs, and throw light is totally reflected on the surface of light absorption department 14, is reflected in trapezoidal narrow side bottom surface by reflecting layer 13.
In order to realize the purpose for improving contrast, it is respectively provided in the micro-structure of above-mentioned screen for absorbing light and/or anti-
Penetrate the optical functional layer of light.But since the size of micro-structure is very small, spacing generally in the range of 25 to 250 microns,
The technique of the coating optical functional layer of micro-structure surface selectivity is extremely complex, and yield rate is low, and optical efficiency is not high.
Summary of the invention
In view of the above-mentioned problems, present invention contemplates that provide it is a kind of it is being shared by long focus projector and ultra short focal projector,
Environment resistant light and the simple projection screen of processing technology and optical projection system.
According to an embodiment of the invention, disclosing a kind of projection screen, projection ray can be reflexed to viewer's
In field range, the projection screen includes light diffusion layer, the total reflection layer being sequentially arranged from the incident side of the projection ray
And light absorbing layer, the light absorbing layer can absorb incident light, the light diffusion layer is used to increase the hair of the light of outgoing
Angle is dissipated,
The total reflection layer is included at least positioned at the microstructured layers of the light diffusion layer side and positioned at the light absorbing layer side
La m, the refractive index of the microstructured layers is greater than the refractive index of the la m, is provided on the microstructured layers multiple
Microstructure unit, multiple microstructure units are extended continuously in the plane of the projection screen and rotational symmetry,
Wherein: each microstructure unit include the first plane, the second plane, third plane and fourth plane, described first
Plane and second plane relative to different from the inclined direction of the parallel plane of the projection screen, the third plane and
The fourth plane is relative to, first plane, described different from the inclined direction of the parallel plane of the projection screen
Two planes, the third plane and the fourth plane are set relative to the inclination angle of the plane parallel with the projection screen
To make:
With the projection ray of the incident angles within the scope of first angle continuously in first plane and described
It is totally reflected at two planes, it is continuously flat in the third with the projection ray of the incident angles within the scope of second angle
It is totally reflected at face and the fourth plane.
Invention additionally discloses a kind of optical projection systems, and the system comprises projection screen as described above and projectors.
As described above, projection screen according to the present invention and optical projection system at least have the advantages that
(1) by the way that totally reflected micro-structure is dexterously arranged, can make projection ray from ultra short focal projector and
Projection ray from long focus projector can be emitted in micro-structure through being totally reflected twice in succession, enable one piece of screen
Enough it is used for ultra short focal projector and long focus projector.
(2) back side for being integrally provided at micro-structure for absorbing the light absorbing layer of environment veiling glare, does not need in micro-structure
Middle coated metal reflectance coating or light absorbing layer, reduce costs, improve yield rate.
(3) micro-structure using the angle selective properties of total reflection but base while reflecting throw light from projector
This is not towards the viewing areas reflection environment veiling glare of viewer.Environment veiling glare from top largely penetrates total reflection micro-structure,
It is absorbed by the light absorbing layer at the back side, fraction is reflected onto except the viewing areas of viewer, therefore is improving projected image
Optical efficiency is improved while contrast.
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 the schematic diagram of the other examples 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 signal of the totally reflected rotational symmetry structure of projection screen according to an embodiment of the present invention
Figure.
Fig. 5 is to show the main cross section knot of the totally reflected microstructure unit of projection screen according to an embodiment of the present invention
Structure schematic diagram.
Fig. 6 is to show the main cross section structure of the microstructure unit of projection screen according to an embodiment of the present invention and be used for
The schematic diagram of optical path when ultra short focal projector.
Fig. 7 is to show the main cross section structure of the microstructure unit of projection screen according to an embodiment of the present invention and be used for
The schematic diagram of optical path when long focus projector.
Fig. 8 is the light path schematic diagram shown when environment veiling glare is radiated at projection screen according to an embodiment of the present invention.
Fig. 9 be show the microstructure unit of projection screen according to another embodiment of the present invention main cross section structure and
The schematic diagram of optical path when for ultra short focal projector and long focus projector.
Figure 10 is to show the schematic diagram of the scattering film layer of projection 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, thickness, thickness proportion and the angle for illustrating each layer in each layer structure in projection screen are not according to actual
What size and ratio 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 projection screen 10 and projector 20.It should be noted that be shown in FIG. 3 be projector 20 be ultra short focal projector
Example, but as described hereinafter, projection screen 10 can be used for long focus projector.Projection screen 10 includes from projector
The incident side of projection ray stack gradually surface micro-structure layer 14, body diffused layer 13, total reflection layer 12 and the light absorption of arrangement
Layer 11.Projection ray from projector 20 is incident to total reflection layer 12 through surface micro-structure layer 14, body diffused layer 13.Under
The incident side of the projection ray of projection screen 10 is also known as the outside (that is, towards viewer) of screen, by light absorption by Wen Zhong
Layer side is known as the inside (that is, backwards to viewer) of screen.Total reflection layer 12 is formed with microstructure unit array.Each micro-structure
Unit includes the optical texture (being discussed in detail below) by ingehious design, so that either from long focus projector
The projection ray that projection ray also comes from ultra short focal projector can be totally reflected in microstructure unit, finally quilt
It reflexes in the field range of viewer, and the environment veiling glare above projection screen 10 is unable to satisfy in microstructure unit
In the only condition that is totally reflected, thus transmission total reflection layer 12 is absorbed by light absorbing layer 11.Light absorbing layer 11 is, for example, black
's.
As shown in figure 4, the microstructure unit of total reflection layer 12 is in screen plane with the array arrangement knot of rotational symmetry
Structure.Rotation center (optical centre) the axis normal to screen plane of the array arrangement structure of the rotational symmetry and it is located at screen
Lower section.Preferably, projector 20 is arranged in the center of rotation axis.
Body diffused layer 13 and surface micro-structure layer 14 have been orderly arranged outside each in total reflection layer 12.Body diffused layer 13 and table
Face microstructured layers 14 may be collectively referred to as light diffusion layer, be used to spread the collimated light beam reflected from total reflection layer 12, so as to throw
Shadow screen 10 has bigger visible angle.Although it should be appreciated that illustrated in Fig. 3 while being provided with body diffused layer 13 and surface
The example of microstructured layers 14, but projection screen 10 can be provided only with body diffused layer 13 or surface micro-structure layer 14.In addition,
The outside of surface micro-structure layer 14 can also add setting protective layer to prevent scratch or chemical attack.It is, of course, also possible to root
Need to be arranged other auxiliary functional layers according to design.
Fig. 5 shows the cross section structure of the microstructure unit of the total reflection layer 12 of projection screen according to an embodiment of the present invention
Schematic diagram.Shown in institute Fig. 5, total reflection layer 12 includes transparent substrate 120, microstructured layers 121 and la m 122.Transparent substrate 120
It contacts near light diffusion layer side and positioned at total reflection layer 12 with light diffusion layer, wherein the transparent substrate 120 includes
The transparent materials such as PET, PC or PMMA.The phase for the side of transparent substrate 120 contacted with light diffusion layer is arranged in microstructured layers 121
Opposite side.Wherein, the microstructured layers 121 use resin material, and the resin is usually epoxide-resin glue system, acrylic adhesive
System, polyester adhesive system, polyurethane adhesive system or polyimides glue system etc..Transparent substrate 120 and microstructured layers 121 pass through UV coating apparatus
Or thermal forming device forms one.La m 122 is formed in the close light absorbing layer side of microstructured layers 121, and inhales with light
Layer 11 is received to be in contact.The refractive index for forming the material of la m 122 is lower than the refractive index for forming the material of microstructured layers 121.Institute
It states the surface adjacent with la m 122 of microstructured layers 121 and is provided with multiple microstructure units.Wherein, in the every of total reflection layer 12
In one microstructure unit, microstructured layers 121 are formed total reflection prism.Fig. 5 shows micro- in two microstructure units
The main cross section diagram of the prism structure of structure sheaf 121.The side of each prism structure is by 4 intersecting planes 1241,1243,1244
It is constituted with 1242.In main cross section diagram shown in Fig. 5, this 4 intersecting planes are illustrated as relative to parallel with projection screen
Plane (hereinafter referred to as " screen plane ") have different inclination angle 4 sequentially connected line segments 1241 to 1244.Its
Middle plane 1241 and 1243, it is different relative to screen inclination angle with plane 1242 and 1244.In other words, in total reflection layer 12
In each microstructure unit, microstructured layers 121 are the ribs of the row's rotational symmetry formed on the surface of transparent substrate 120
Mirror, plane 1241,1243,1244 and 1244 are the boundaries between microstructured layers 121 and both the different material layers of la m 122
Face, wherein microstructured layers 121 are first material layer, and the la m 122 is second material layer.For example, such prism is logical
It crosses using solidifying to coil coating cloth resin and UV or heat curing process is process.It is clear in order to illustrate in Fig. 5, illustrate only two
A microstructure unit.It will more detail subsequently, since the projection ray of ultra short focal projector is incident to projection screen in as follows
Incident angle range (first angle range, such as 30 degree to 80 degree) and the projection ray of long focus projector be incident to projection screen
Incident angle range (second angle range, such as 0 degree to the 30 degree) difference of curtain is larger, so by the way that plane is dexterously arranged
1241,1243,1244 and 1244 inclined direction and tilt angle can make the incident ray 123 from ultra short focal projector
(as shown in Figure 5) recurs at two planes 1241 and 1242 and is totally reflected twice, is finally reflected into the visual field of viewer
In range, and make the incident ray 123 (being not shown in Fig. 5, please refer to Fig. 7) from long focus projector can be respectively at two
It is totally reflected, is finally reflexed in the field range of viewer at plane 1243 and 1244.That is, in microstructured layers 121, it is micro-
Interface between structure sheaf 121 and la m 122 includes two groups of planes, and one group (1241 and 1242) for making from ultrashort burnt throwing
The incident ray of shadow machine occurs total reflection and enters in the field range of viewer, and another group (1243 and 1244) for making to come from
The incident ray of long focus projector occurs total reflection and enters in the field range of viewer.
In addition, environment veiling glare 127 mostlys come from the ceiling light in room.In most cases, ceiling light is far from screen
Microstructure unit rotational symmetry structure rotation axis.Therefore, the incidence angle of environment veiling glare 127 is less than from ultrashort burnt throwing
The incident angle of the projection ray of shadow machine, but it is much larger than the incident angle of the projection ray from long focus projector.Therefore, ring
Border veiling glare 127 is unable to satisfy in plane 1241 and plane 1242 or occurs to be totally reflected twice in succession in plane 1243 and 1244
Condition, the overwhelming majority penetrated microstructure unit and absorbed by light absorbing layer 11.
As described above, the angle Selection sexual reflex of total reflection layer 12 is utilized in projection screen 10 according to an embodiment of the present invention
Characteristic, so that in the field range that the projection ray from ultra short focal projector can either be reflexed to viewer by screen, and energy
In enough field ranges that the projection ray from focal length projector is reflexed to viewer.Meanwhile projection screen 10 can also be certainly
It is dynamic to distinguish projection ray and ambient light, and the light absorbing layer 11 for absorbing environment veiling glare is integrally provided at total reflection layer
12 inside reduces costs to realize high contrast and simplify processing technology, improves yield rate.
Two, the optical principle and angle Selection of microstructure unit are totally reflected
The total reflection micro-structure of projection screen 10 according to an embodiment of the present invention is described in detail next, with reference to Fig. 6 to Fig. 8
The optical principle of unit.Wherein, Fig. 6 shows the optical path example when projection screen 10 is for ultra short focal projector, and Fig. 7 is shown
Optical path example when projection screen 10 is used for long focus projector, Fig. 8 are shown when environment veiling glare is incident to projection screen 10
When optical path example.
As shown in fig. 6, the refractive index of microstructured layers 121 is n1Refractive index with la m 122 is n2, the 4 of microstructure unit
A inclined intersecting plane 1241,1242,1243 and 1244 is respectively θ relative to the inclination angle of screen plane1、θ2、θ3And θ4
(unit is degree, similarly hereinafter).Incident ray and the angle of reflection light and vertical direction are respectively α and β (unit is degree, similarly hereinafter).
Wherein, when reflection light horizontal exit, β is obviously 0 degree, and is set: when reflection light below horizontal line (that is, be biased to
Ground) when β be negative value, when reflection light (that is, be biased to ceiling) above the horizon, β is positive value.
It is complete twice in order to occur that the incident ray 123 from ultra short focal projector 20 on clinoplain 1241 and 1242
It is emitted after reflection towards the eyes direction of viewer, according to geometric optical theory and optical total-reflection condition, it is necessary to meet such as
Under 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 viewer side, γ is negative value.Then according to geometric optics
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 1241 and 1242 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 according to different application demands, by adjusting intermediate rays optical path (that is, value of adjustment γ) certain
To θ in range1And θ2Value selected.For example, projector is located at the lower section of screen, institute in the application of ultrashort out-of-focus projection
It is always set up with α > 0；And the eyes of spectators are located at the top of projector, in order to guarantee that emergent ray is incident to spectators' eyes, institute
It is also always set up with alpha+beta > 0；In the case, available by formula (1):
θ1+θ2< 90 (6)
By formula (6) it is found that in the application of ultrashort out-of-focus projection, the microstructure unit of projection screen according to the present invention
The angle that two clinoplains 1241 and 1242 are formed is necessary for obtuse angle.
In addition, as the above analysis, the incident ray 123 from ultra short focal projector passes through the inclination of microstructure unit
It is preferred that intermediate rays after the total reflection of plane 1241, which are advanced in microstructured layers 121 along the direction parallel with screen plane,
's.
At this point, θ is worked as in γ=0 degree, β=0 degree2=45 degree, emergent ray along outgoing, that is, β=0 degree with screen vertical,
Again according to θ known to above-mentioned formula (6)1< 45 degree namely θ1<θ2。
Since one group of clinoplain 1241 and 1242 of microstructure unit has optical texture as described above, in Fig. 6
It is shown, one group clinoplain 1241 He of a part of incident ray 123 from ultra short focal projector 20 in microstructure unit
Occur to be totally reflected twice at 1242, be reflected onto the field range of viewer；And another portion from ultra short focal projector 20
Incident ray 123 is divided to be radiated on another group of clinoplain 1243 and 1244 of microstructure unit, due to 1243 He of clinoplain
1244 do not have above-mentioned optical texture, so the incident ray 123 from ultra short focal projector 20 is in 1243 He of clinoplain
Total reflection condition is unsatisfactory at least one of 1244, then this some light penetrates total reflection layer, by the light absorbing layer of inside
11 absorb.
Fig. 7 illustrates the optical path example when projection screen 10 is for long focus projector.When projection screen 10 be used to grow
When focus projector, as shown in fig. 7, a part of incident ray 123 is at one group of clinoplain 1243 and 1244 of microstructure unit
Generation is totally reflected twice, is reflected onto the field range of viewer.Since the incident ray of long focus projector may be considered
With the approximate angle incidence with vertical screen plane, so in order to reflex to incident ray in the field range of viewer,
Clinoplain 1243 and 1244 needs to meet following relational expression relative to the inclination angle of screen plane:
θ3+θ4=90 (6)
In addition, another part incident ray 123 is radiated on another group of clinoplain 1241 and 1242 of microstructure unit,
Since the inclination angle of clinoplain 1241 and 1242 is unsatisfactory for relational expression (6), so the incident ray 123 from long focus projector
Total reflection condition is unsatisfactory at least one of clinoplain 1241 and 1242, then this some light penetrates total reflection layer,
It is absorbed by the light absorbing layer 11 of inside.
In microstructure unit, other than the tilt angle relative to screen plane, ultrashort coke is come from for being totally reflected
The plane 1241 and 1242 of the projection ray of projector and the plane for being totally reflected the projection ray from long focus projector
The relationship of the development length of 1243 and 1244 this two groups of planes also has large effect to the optical property of screen.Pass through experiment
It is found that when plane 1243 and 1244 development length and plane 1241,1242,1243 and 1244 the ratio between extension total length (that is,
In the main cross section figure of Fig. 6 to Fig. 8, the sum of length of line segment 1243 and line segment 1244 and 1241 line segment 1242 of line segment, line segment
1243 and line segment 1244 total length ratio) 0.2 and less than 0.8 should be greater than.
It compares with above situation, Fig. 8 illustrates the optical path example when environment veiling glare is incident to projection screen 10.It is throwing
In the practical service environment of shadow system, environment veiling glare is generally mainly derived from the lamps and lanterns above ceiling or wall.Thus, environment
What the incident angle of veiling glare on the projection screen will be issued much smaller than the ultra short focal projector from being located at screen lower section short distance
The incidence angle of projection ray.Therefore, when environment veiling glare 127 is incident on projection screen from ceiling side, environment is miscellaneous
Light is unable to satisfy in plane 1241 and 1242 or recurs the condition being totally reflected twice in plane 1243 and 1244, but
It is fully absorbed through total reflection layer by the light absorbing layer 11 of inside.
In addition, being to set gradually 1241,1243,1244 and in the figure of main cross section from top to bottom in the above description
The explanation carried out in case where 1242.However, by analysis above it is found that the order of placement of four planes is without being limited thereto.Example
Such as, as shown in figure 9, can also by be used for be totally reflected from the projection ray of long focus projector one group of plane (that is,
1243 and 1244) be set to outside, in other words, according to be followed successively by from top to bottom 1243,1241,1242 and 1244 sequence arrange
This four planes.Wherein, as described above, the angle of plane 1243 and plane 1244 is 90 degree, plane 1241 and plane 1241
Angle is obtuse angle.
In addition, and including multiple micro-structures as described above, projection screen according to the present invention 10 has rotational symmetry structure
Unit.Therefore, the angle design of each microstructure unit can be same or different.For example, in order to make emergent ray begin
The direction of whole horizontally directive viewer, so β=0 degree and θ2=45 degree are set up always.According to analog result it is found that micro-structure
The θ of unit1It is gradually reduced with the top of close screen, and θ1<θ2, thus meet above-mentioned formula (6).Alternatively, can also be
Under the premise of meeting above-mentioned formula (1) to (6), along the direction from screen center to screen edge, the micro-structure of projection screen
The θ of unit1Value constantly reduce and θ2Value constantly increase.
Three, it is totally reflected the refractive index selection of microstructure unit
In addition to θ1To θ4Value 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 microstructured layers 1211With the refractive index n of la m 1222Influence.Projection screen according to the present invention
The microstructured layers 121 of curtain are usually made of transparent resin material, and refractive index is in the range of 1.3~1.7.Alternatively, micro-
Structure sheaf 121 also can be used the other materials with similar refractive index and be made.Furthermore it is also possible to microstructured layers 121 are made
Material in adulterate scattered ion(s) or absorbing material etc..Thus, in order to meet the condition of total reflection, need to consider la m 122
Refractive index n2Selection.Incident ray V can be expressed as (Vx,Vy,Vz), wherein z-axis normal to screen, and X, Y-axis are 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 microstructured layers 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.With n2Increase, meet the incident ray that is totally reflected on two inclined-planes of microstructure unit
Region constantly reduce.In other words, with n2Increase, the light issued from projector can not be at two of microstructure unit tiltedly
Face occurs the probability being totally reflected twice and increases.Therefore, it in order to guarantee certain screen reflection efficiency, needs to 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.In the case, micro- knot
The tip of the reflecting prism of structure layer 121 can directly be bonded to light absorbing layer 11.
Four, the selection of light diffusion layer
As described above, projection ray is after the reflection of total reflection layer 12, the angle of divergence of emergent ray generally all very little, in order to
Increase the visual range of projected picture, light diffusion layer can be set in the outside of total reflection layer 12.In the example depicted in fig. 3,
Total reflection layer 12 has been orderly arranged outside each body diffused layer 13 and surface micro-structure layer 14 as light diffusion layer.However, it is also possible to
It is provided only with one layer of light diffusion layer.A~c of Figure 10 respectively illustrates 3 kinds of commercialization optical scatterings that may be used as light diffusion layer
Membrane structure: volume scattering film, irregular surface scatter film and regular surfaces microlens array film.These types scattering film
Material may serve to increase the visual range of screen, and can according to need exclusive use or stacking use.For example, can be with
The micro- knot of body diffused layer 13 and surface in Fig. 3 is formed using volume scattering film and regular surfaces microlens array film by superposition
Structure layer 14.The value volume and range of product of stacking is without being limited thereto.
In the case where using optical scattering film as light diffusion layer, total reflection layer and light diffusion layer is first respectively prepared,
Then optics is bonded.Alternatively, different surfaces can also be carried out by two surfaces to same substrate (for example, PET)
Processing, is respectively formed light scattering layer and total reflection layer.
Although above, with reference to the accompanying drawings of luminaire according to the present invention, but the invention is not restricted to this,
And it will be understood by those skilled in the art that in the case where the spirit or scope limited without departing from appended claim of the present invention,
Various changes, combination, secondary combination and modification can be made.
Claims (14)
1. a kind of projection screen can reflex to projection ray in the field range of viewer, which is characterized in that
The projection screen includes light diffusion layer, total reflection layer and the light absorption being sequentially arranged from the incident side of the projection ray
Layer, the light absorbing layer can absorb incident light, and the light diffusion layer is used to increase the angle of divergence of the light of outgoing,
The total reflection layer is included at least positioned at the microstructured layers of the light diffusion layer side and in the light absorbing layer side
Side layer, the refractive index of the microstructured layers are greater than the refractive index of the la m, are provided with multiple micro- knots on the microstructured layers
Structure unit, multiple microstructure units are extended continuously in the plane of the projection screen and rotational symmetry,
Wherein: each microstructure unit includes the first plane, the second plane, third plane and fourth plane, first plane
It is different relative to the inclined direction of the plane parallel from the projection screen with second plane, the third plane and described
Fourth plane is first plane, described second flat relative to different from the inclined direction of the parallel plane of the projection screen
Face, the third plane and the fourth plane are arranged to make relative to the inclination angle of the plane parallel with the projection screen
:
With the projection ray of the incident angles within the scope of first angle continuously in first plane and described second flat
Be totally reflected at face, with the projection ray of the incident angles within the scope of second angle continuously in the third plane and
It is totally reflected at the fourth plane.
2. projection screen according to claim 1, which is characterized in that the total reflection layer further includes transparent substrate layer, institute
Microstructure unit is stated by coating resin, and solidify in the transparent substrate layer by UV solidification or thermoforming mode.
3. projection screen according to claim 1, which is characterized in that the first material layer of each microstructure unit
It is arranged to the total reflection prism of rotational symmetry, first plane, second plane, the third plane and described Siping City
Face is respectively θ relative to the inclination angle of the plane parallel with the projection screen1、θ2、θ3And θ4, wherein
θ1And θ2Meet relationship: θ1+θ2< 90, and
θ3And θ4Meet relationship: θ3+θ4=90.
4. projection screen according to claim 3, which is characterized in that in multiple microstructure units, the θ2It is
45 degree.
5. projection screen according to claim 3, which is characterized in that in multiple microstructure units, the θ1It is not
With, the θ2It is different, the θ3It is different, and the θ4Also it is different.
6. projection screen according to claim 1, which is characterized in that the refractive index n of the first material layer1With described
The refractive index n of two material layers2Meet relationship: n2<n1-0.2。
7. projection screen according to claim 1, which is characterized in that first plane, second plane, described
Three planes and the fourth plane totally reflected along vertical direction and are being parallel to the plane of the projection screen just described
The first length L is respectively provided in the main cross section of friendship1, the second length L2, third length L3With the 4th length L4, the L1, the L2、
The L3With the L4Meet following relationship:
8. projection screen according to any one of claim 1 to 6, which is characterized in that the light diffusion layer is dissipated by body
Penetrate film, irregular surface scattering one of film and regular surfaces microlens array film are formed；Or
The light diffusion layer is thin by stacking volume scattering film, irregular surface scattering film and regular surfaces microlens array
At least one of film and formed.
9. projection screen according to any one of claim 1 to 8, which is characterized in that the second material layer is air
Layer.
10. projection screen according to any one of claim 1 to 8, which is characterized in that first plane and described
Two planes are provided so that place occurs after being totally reflected for the first time one of in both for the projection ray, along with institute
The parallel direction of projection screen is stated to advance.
11. projection screen according to any one of claim 1 to 8, which is characterized in that rotational symmetry it is multiple described micro-
The center of rotation axis of structural unit is perpendicular to the plane parallel with the projection screen and positioned at the lower section of the projection screen.
12. a kind of optical projection system, the system comprises as described in any one of claims 1 to 11 projection screen and projection
Machine.
13. optical projection system as claimed in claim 12, which is characterized in that the projector is located at below the projection screen
Ultra short focal projector, the projection ray from the projector with the incident angles within the scope of the first angle extremely
The projection screen.
14. optical projection system as claimed in claim 12, which is characterized in that the projector is long focus projector, from described
The projection ray of projector is with the incident angles within the scope of the second angle to the projection screen.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710663024.9A CN109388014B (en) | 2017-08-04 | 2017-08-04 | Projection Screens and Projection Systems |
| PCT/CN2017/114725 WO2019024366A1 (en) | 2017-08-04 | 2017-12-06 | Projection screen and projection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710663024.9A CN109388014B (en) | 2017-08-04 | 2017-08-04 | Projection Screens and Projection Systems |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109388014A true CN109388014A (en) | 2019-02-26 |
| CN109388014B CN109388014B (en) | 2021-07-06 |
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ID=65232229
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710663024.9A Active CN109388014B (en) | 2017-08-04 | 2017-08-04 | Projection Screens and Projection Systems |
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| CN (1) | CN109388014B (en) |
| WO (1) | WO2019024366A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112180673A (en) * | 2019-07-05 | 2021-01-05 | 深圳光峰科技股份有限公司 | Projection screen |
| WO2021088883A1 (en) * | 2019-11-04 | 2021-05-14 | 深圳光峰科技股份有限公司 | Projection screen and projection system |
| US20220221780A1 (en) * | 2019-05-30 | 2022-07-14 | Appotronics Corporation Limited | Projection screen |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN109388014B (en) | 2021-07-06 |
| WO2019024366A1 (en) | 2019-02-07 |
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