CN106019796B - A kind of projection screen, large scale Mosaic screen and optical projection system - Google Patents
A kind of projection screen, large scale Mosaic screen and optical projection system Download PDFInfo
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- CN106019796B CN106019796B CN201610651168.8A CN201610651168A CN106019796B CN 106019796 B CN106019796 B CN 106019796B CN 201610651168 A CN201610651168 A CN 201610651168A CN 106019796 B CN106019796 B CN 106019796B
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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
- G03B21/62—Translucent screens
- G03B21/625—Lenticular translucent screens
Abstract
The invention discloses a kind of projection screen, including Fresnel Lenses layer, and also include the microlens layer positioned at Fresnel Lenses layer light emission side, wherein microlens layer includes multiple lenticule groups in array distribution.Along projection image's beam exit direction, lenticule group includes successively：First lenticule, it is negative lens；And second lenticule, it is positive lens；Also, the abbe number of the first lenticule is less than the abbe number of the second lenticule.After projection image's light beam is transmissive at least for Fresnel Lenses layer, and finally enter human eye after microlens layer is emitted, above-mentioned technical proposal is by setting two kinds of different lens of abbe number, the deviation difference for the light beam that the latter can transmit to the former compensates, the registration of each primary lights light beam is improved, solves the color offset phenomenon that projection screen watches image frame under different visual angles.
Description
Technical field
The present invention relates to display technology field, espespecially a kind of projection screen, Mosaic screen and optical projection system.
Background technology
In field of projection display, especially field of projection display, the use of projection screen is gradually from traditional white curtain
Develop into using hard screen, currently used optical screen is the one kind shielded firmly, such as Fresnel screen, and Fresnel screen is using luxuriant and rich with fragrance
Nie Er lens arrangement principles, the incident light beam of certain angle can be subjected to collimation and become directional light, and be ultimately delivered to human eye into
Picture, the interference of ambient light can be reduced, improve screen intensity and contrast.
But in actual applications, found according to the test result of the white field of the image being emitted to projection screen, technical staff,
Center's point of screen, i.e. horizontal view angle are that the colour cast at 0 is 0, and as the increase of horizontal view angle, caused colour cast can also increase therewith
Greatly, and, with the increase of vertical angle of view, caused colour cast can also increase therewith, i.e., as visual angle increases, produce different degrees of
Colour cast.Figure 1A is using rear projection screen as test object, and Figure 1B is using front projection screen as test object, and respectively with LED
Light sources project machine and laser light source projection are tested as projector equipment, are obtained different but are deposited the color occurred with visual angle
Inclined phenomenon.
The direct vision performance of colour cast is exactly that white field is no longer default color temperature value, and relatively certain primary colours color shows
Show, so as to human eye, image frame color to be present in different visual angles or diverse location viewing display picture inconsistent, especially right
In large screen splicing is shown, more scene is used for white field, such as the PPT displayings of large conference room, different visual angles or not
Colour cast with position can substantially reduce the experience of user.
Therefore, how to effectively reduce projection screen turns into urgent problem to be solved in colour cast caused by display picture.
The content of the invention
The embodiment of the present invention provides a kind of projection screen, large scale Mosaic screen and optical projection system, to reduce projection
Color offset phenomenon during on-screen displays under different visual angles.
To realize above-mentioned technical purpose, adopt the following technical scheme that：
In a first aspect, the embodiment of the present invention provides a kind of projection screen, including at least Fresnel Lenses layer, in addition to it is located at
The microlens layer of Fresnel Lenses layer light emission side；Microlens layer includes：Multiple lenticule groups in array distribution；
Along projection image's beam exit direction, lenticule group includes successively：First lenticule, the first lenticule are negative saturating
Mirror, and the second lenticule, the second lenticule are positive lens, wherein the abbe number of the first lenticule is less than the second lenticule
Abbe number；After projection image's light beam is transmissive at least for Fresnel Lenses layer, and finally enter human eye after microlens layer is emitted；
Preferably, projection screen is front projection screen, in addition to dyed layer, diffusion layer, and reflecting layer, wherein, project shadow
It is saturating microlens layer, dyed layer, diffusion layer, Fresnel Lenses layer as light beam is incident successively, and is turned back after reflecting layer is reflected, then
It is secondary to pass through Fresnel Lenses layer, diffusion layer, dyed layer, and finally enter human eye after microlens layer is emitted；
Or, it is preferable that projection screen is rear projection screen, in addition to lens pillar layer, wherein, projection image's light beam is successively
After incident Fresnel Lenses layer, lens pillar layer, and enter human eye after final incident microlens layer and outgoing；
Preferably, the first lenticule is biconcave lens structure or plano-concave lens structure, and the second lenticule is biconvex lens knot
Structure or planoconvex spotlight structure；
Preferably, the first lenticule and the second lenticule be brought into close contact or between the gap of pre-determined distance be present；
Preferably, the abbe number of the first lenticule is 30-80；The abbe number of second lenticule is 10-30；
Preferably, the material of the first lenticule and/or the second lenticule is optics plastic cement or optical glass；
Preferably, the first lenticule, the second lenticule are non-spherical lens.
Second aspect, the embodiment of the present invention provides a kind of large scale splicing projection screen, using any of the above-described technical scheme
Projection screen.
The third aspect, the embodiment of the present invention provide a kind of optical projection system, including laser projection device, in addition to any of the above-described
Projection screen in technical scheme.
Above example of the present invention at least has the advantages that：
Projection screen provided in an embodiment of the present invention, it is Fresnel screen, including positioned at the micro- of Fresnel Lenses layer light emission side
Lens jacket, after projection image's light beam is transmissive at least for Fresnel Lenses layer, and finally enter human eye after microlens layer is emitted.Edge
Projection image's beam exit direction, microlens layer include the first lenticule, and the first lenticule is negative lens, and second micro-
Mirror, the second lenticule are positive lens, wherein, the abbe number of the first lenticule is less than the abbe number of the second lenticule, projection
After image strip is transmissive at least for the Fresnel Lenses layer, and finally enter human eye after microlens layer outgoing.Pass through
First lenticule and the different abbe number of the second lenticule are set, form the difference of refractive index, the first lenticule enters to light beam
The larger deviation degree diverging of row, and the second lenticule carries out the convergence of smaller deviation degree to light beam, with to each of different wave length
The deviation difference that primary lights occur in the first lenticule compensated during reverse deviation, makes each primary colours of outgoing
The light of light essentially coincides, and substantially reduces the degree of separation of the primary lights of different wave length, reduces white light W after projection screen
Dimensional energy distribution change so that colour cast of the white light under different visual angles reduces, lifting shows the uniformity of color.
And scheme of the embodiment of the present invention additionally provides a kind of large scale splicing projection screen, using above-mentioned technical proposal
Projection screen, can reduce during so as to realize multi-screen splicing because splicing picture caused by unit mosaic screen color offset phenomenon is serious
Irregular colour is even, colour cast, and lifting large scale projected picture shows the uniformity of color.
, can using the projection screen of above-mentioned technical proposal and scheme of the embodiment of the present invention additionally provides optical projection system
Color offset phenomenon is reduced, lifting projected picture shows the uniformity of color, also improves Consumer's Experience.
Brief description of the drawings
Figure 1A is colour cast variation diagram schematic diagram existing for a kind of projection screen in the prior art；
Figure 1B is colour cast variation diagram schematic diagram existing for another projection screen in the prior art；
Fig. 1 C are each luminance primary change schematic diagram in color offset phenomenon；
Fig. 2A is front projection screen structural representation in the prior art；
Fig. 2 B are front projection screen light path schematic diagram in the prior art；
Fig. 2 C are rear projection screen structural representation in the prior art；
Fig. 2 D are rear projection screen light path schematic diagram in the prior art；
Fig. 3 A are a kind of structural representation of projection screen in the embodiment of the present invention one；
Fig. 3 B are the index path that the light beam process based on Fig. 3 A is lens jacket；
Fig. 3 C are the projection screen light path schematic diagram based on Fig. 3 A；
Fig. 3 D are another microlens layer light path schematic diagram in the embodiment of the present invention one；
Fig. 4 A are the structural representation of projection screen in the embodiment of the present invention two；
Fig. 4 B are the index path that the light beam based on Fig. 4 A passes through microlens layer；
Fig. 4 C are another microlens layer light path schematic diagram in the embodiment of the present invention two；
Fig. 5 is the large scale Mosaic screen schematic diagram of the embodiment of the present invention three；
Fig. 6 is projection system architecture schematic diagram in the embodiment of the present invention four；
Fig. 7 is projection system architecture schematic diagram in the embodiment of the present invention five.
Embodiment
The embodiment of the present invention provides a kind of projection screen and projection arrangement, is produced to reduce projection screen in display picture
Colour cast of the raw white light under different visual angles.
In order that the object, technical solutions and advantages of the present invention are clearer, the present invention is made below in conjunction with accompanying drawing into
One step it is described in detail, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole implementation
Example.Based on the embodiment in the present invention, what those of ordinary skill in the art were obtained under the premise of creative work is not made
All other embodiment, belongs to the scope of protection of the invention.
The projection screen of specific embodiment of the invention offer is discussed in detail below in conjunction with the accompanying drawings and using the projection screen
Optical projection system.
Embodiment one,
As shown in Figure 2 A, it is a kind of structural representation of front projection screen in the prior art, including：Dyed layer 21, diffusion layer
22nd, Fresnel Lenses layer 23 and reflecting layer 24, wherein, dyed layer 21 is located at the outermost of projection screen, and projection image's light beam is most
It is first incident, also it is emitted eventually through the layer, the main function of dyed layer is to improve the color restoration capability of projection screen, have
When dyed layer 21 can also be substituted by substrate layer, substrate layer includes dyed layer and hard film layer, and hard film layer primarily serves protection and made
With.
Diffusion layer 22 is mainly used in uneven incident light and homogenized, and the angle of emergent light is enlarged.
Fresnel Lenses layer 23 is used to carry out the light beam in the range of the certain angle of incidence to collimate parallel injection, and will be anti-
The light beam for penetrating the reflection of layer 24 is dissipated.
Reflecting layer 24 is usually aluminium mirror coating layer, is plated on the outside of Fresnel Lenses layer 23.
Because the primary lights refractive index in media as well of different wave length in the white light W on projector to projection screen has
Institute's difference, so that different changes occurs by the deviation angle of the light of the different wave length of Fresnel Lenses layer 12, wherein,
Blue light B wavelength is most short, thus refractive index is maximum, and the dimensional energy distribution after screen is broader, and the feux rouges R that wavelength is most long
Because refractive index is minimum the dimensional energy distribution angle after screen is smaller, by existing in actual measurement as shown in Figure 2 A
After projection screen in technology each primary lights with visual angle brightness curve, as visual angle increases it can be seen from Figure 1B and Fig. 1 C,
White light W after the Fresnel Lenses layer and lens pillar layer of projection screen each primary lights with visual angle brightness change schematic diagram,
Wherein, blue light B wavelength is most short, and refractive index is maximum, and relative luminance change is relatively slow, and the dimensional energy distribution after screen is more
Broadness, and the most long feux rouges R of wavelength because refractive index minimum the dimensional energy distribution angle after screen is smaller.Cause
This, as visual angle increases, ratios of the blue light B in white light gradually increases, and causes colour temperature more and more higher, there occurs Xiang Gaose for white field
The colour cast in warm direction.
For problems of the prior art, the embodiment of the present invention one provides a kind of projection screen, be specifically it is a kind of just
Projection screen, as shown in Figure 3A, include microlens layer 31, dyed layer 32, diffusion layer successively along projection image's light beam incident direction
33rd, Fresnel Lenses layer 34 and reflecting layer 35.Wherein, projection image's light beam incident microlens layer 31, dyed layer 32, diffusion successively
Layer 33, Fresnel Lenses layer 34, and turned back after reflecting layer 35 is reflected, again pass by Fresnel Lenses layer 34, diffusion layer 33,
Chromatograph 32, and finally enter human eye after the outgoing of microlens layer 31.
Microlens layer 31 includes：Multiple lenticule groups in array distribution.
Along projection image's beam exit direction, lenticule group includes：First lenticule 311, the first lenticule 311 are negative saturating
Mirror, and the second lenticule 312 being set up in parallel with the first lenticule 311, the second lenticule are positive lens.First lenticule
311 abbe number is less than the abbe number of the second lenticule 312.
For incident ray, the second lenticule 312 is used to enter line convergence deviation to the white light of incidence；First lenticule 311
For dissipating each primary lights for occurring deviation difference after the deviation of the second lenticule 312.
For emergent ray, the first lenticule 311 is used to dissipate each primary lights in emergent ray；Second is micro-
Mirror 312 is used to enter line convergence to each primary lights, poor to reduce the deviation of each primary lights after the diverging of the first lenticule 311
It is different.
The light path schematic diagram by above-mentioned microlens layer as shown in Figure 3 B.
Wherein, W represents the white light being emitted by projector, and R, G, B represent the feux rouges, green with different wave length in white light respectively
Light and blue light.The primary lights of different wave length refractive index in lens has differences in white light W, therefore, has the red of different wave length
Light R, green glow G and blue light B form each primary lights meeting of white light in incident most the second lenticule 312 of lens jacket 31 first
Focal length after poly- is also different, wherein, blue light B wavelength is most short, by its deviation during the second lenticule 312 degree most
Greatly, therefore its focal length is most short；It is minimum by the degree of its deviation during the second lenticule 312 and feux rouges R wavelength is most long, its focal length
It is maximum.Thus, after the converging action by the second lenticule 312, the deviation of feux rouges R, green glow G and blue light B in white light
Difference occurs for degree.And the first lenticule 311 has a less abbe number relative to the second lenticule 312, therefore relative to
Second lenticule 311 can be to each primary colours light after the convergence of incidence（Feux rouges R, green glow G and blue light B）Greatly sent out
Effect is dissipated, when white light is incident to the first lenticule 311 by the second lenticule 312, the first lenticule 311 is micro- for second
Lens 312, the deviation difference that each primary lights of different wave length occur in the second lenticule 312 compensate, and make outgoing
The light of each primary lights（R、G、B）Essentially coincide, substantially reduce the degree of separation of the primary lights of different wave length.
Entered again by 311 lateral microlens layer 31 of the first lenticule after the reflection in reflecting layer 35 in above-mentioned coincidence light
When penetrating, the process phase for being incident upon microlens layer 31 is reentered because white light is incident to microlens layer 31 and reflected by reflecting layer 35
Instead, its index path is incident to the first lenticule first as shown in Fig. 3 B return light path in R, G, B tri-color beam of divergent state
311, the first lenticule 311 is negative lens, and light beam is dissipated, and due to relatively low abbe number, to each primary colours
Light beam has higher refractive index, and each primary lights are also different when by the diverging of the second lenticule 311, specifically
, the blue light B degrees of divergence in white light are maximum, next to that green glow G, is finally feux rouges R.In hair after the first lenticule 311
Each primary lights of bulk state, which reenter, is incident upon the second lenticule 312, and the second lenticule 312 is positive lens, and abbe number is more than the
One lenticule 311, so as to which refractive index is less than the first lenticule 311, i.e., to the deviation degree in the aggregation procedure of light beam relatively
It is small.R, G, B three primary colours light are incident to the second lenticule 312 and reach the same point of exiting surface, and during outgoing, deviation degree still suffers from
B light is maximum, the minimum difference of R light, but is respectively less than the deviation degree through the first lenticule 311 so that originally deviation is most strict
Harmful B light, the downward deviation of the G light and R light of next are assembled, make the light direction of three primary colours light consistent, be finally converged to a branch of
White light.Twice by the light path of microlens layer 31 to be reversible, according to reversibility of optical path principle iting can be seen from, the light that is finally emitted with
Initially incident light is identical, all for the white light of primary colours deviation does not occur.
When being projected using above-mentioned projection screen provided in an embodiment of the present invention, by projector to projection screen
White light index path as shown in Figure 3 C, by white light W it can be seen from Fig. 3 C in the white light W after projection screen different wave length
The light of each primary lights（R、G、B）It is completely superposed.Thus can be effective using above-mentioned projection screen provided in an embodiment of the present invention
Reduce each primary lights in white light causes dimensional energy distribution to change due to deviation difference, thus, each primary lights institute in white light
Accounting example keeps constant, and colour temperature difference can't occur with the increase at visual angle, will not also cause white light under different visual angles
Colour cast, lifting show color uniformity.
In the specific implementation, the first lenticule 311 in lenticule group can use concavees lens structure, the second lenticule 312
Convex lens structures can be used, the first lenticule 311 of concavees lens structure has disperse function, and abbe number is small, to light beam
Deviation degree is higher, and larger deflection of light difference reduces caused by each primary lights after the second lenticule 312 of convex lens structures, makes
It must reduce by the degree of separation of each primary lights in the white light after lenticule group.
Further, in above-mentioned projection screen provided in an embodiment of the present invention, the abbe number of the first lenticule 311 is small
In the abbe number of the second lenticule 312.Abbe number has reacted the primary colours that white light incides different wave length when in transparent medium
Optical index with wavelength change difference degree, abbe number it is smaller represent primary lights in the medium refractive index with wavelength change
Change degree is bigger, i.e. the degree of the generation deviation of primary lights in the medium is bigger.For example, do not planting transparent Jie of abbe number
In matter, the blue light B in white light W is bigger in high dispersive medium, i.e., the degree of the generation deviation in the less medium of abbe number.
In above-mentioned lenticule group in embodiments of the present invention, using different materials, make the dispersion of the first lenticule 311
Coefficient is less than the abbe number of the second lenticule 312.Specifically, in above-mentioned projection screen provided in an embodiment of the present invention, the
The abbe number of two lenticules 312 can be 30-80, and the abbe number of the first lenticule 311 can be 10-30.
From foregoing to explanation of the white light Jing Guo lenticule group light path, when projection image's beam exit, first is micro-
Mirror 312 acts on divergence of beam and with higher dispersion（Abbe number is smaller）, the convergence of rays effect of the second lenticule 312
With low dispersion（Abbe number is larger）So that each primary lights in white light W（R、G、B）Degree of separation it is smaller, and cause original separate
Each primary lights（R、G、B）Light essentially coincide together.Therefore, the second lenticule 312 and the first lenticule 311 are in dispersion
Difference on coefficient, the second lenticule 312 is set to there is compensation to make the deviation difference of each primary lights by the first lenticule 311
With.In the specific implementation, above-mentioned the first lenticule 311 and the second lenticule can be made using different materials according to being actually needed
312, so that the abbe number of the first lenticule 311 is less than the abbe number of the second lenticule 312, so that the first lenticule
311 be low dispersion concavees lens, and the second lenticule 312 is high dispersion convex lens.
In addition, the dispersion of the first lenticule 311 and the second lenticule 312 can be also adjusted in the range of above-mentioned abbe number
Coefficient, the embodiment of the present invention are not defined to the specific value of the abbe number of each lenticule.
In the specific implementation, in above-mentioned projection screen provided in an embodiment of the present invention, as shown in figs.3 a and 3b, first is micro-
Lens 311 are brought into close contact with the second lenticule 312.In actual applications, the first lenticule 311 and the second lenticule 312 can be adopted
Fit together with the mode of gluing, its depolarized principle is as described above, here is omitted.
In addition, as shown in Figure 3 D, there may be between the first lenticule 311 and the second lenticule 312 in lenticule group
The gap of pre-determined distance, now, as shown in Figure 3 D, specifically, white light W is entering index path when white light W incides lenticule group
It is mapped to the second lenticule 312 to assemble afterwards, due to each primary lights in white light W（R、G、B）In the second lenticule 312
Refractive index difference causes the deviation degree of each primary lights that difference, each primary lights after the second lenticule 312 occur（R、G、B）
Incided behind the air gap through the secondth lenticule 312 and the first lenticule 311 in the first lenticule 311, first
Lenticule 311 has relatively low abbe number relative to the second lenticule 312 so that each primary lights are in the first lenticule 311
Diverging, and largely reverse deviation occurs, so that each primary lights in the white light W of outgoing（R、G、B）Essentially coincide.
Light after being reflected by reflecting layer 35 is incident to the light path of microlens layer 31 as shown in Figure 3 D again, its process
With being incident to the light path process of microlens layer 31 for the first time on the contrary, therefore, the light being finally emitted and initial incident light are equal
For the refractive power of primary colours deviation does not occur.Exist it can be seen from Fig. 3 D between the first lenticule 311 and the second lenticule 312
During certain interval, lenticule group can carry out deviation to inciding lenticule group close to the light of edge, therefore, be set using gap
Put the first lenticule 311 and the second lenticule 312 is applied to lenticule microscope group and has a case that larger aperture, in practical application
When, the white light Jing Guo lenticule group can be eliminated according to any setting lenticule group being actually needed using above two mode
Colour cast.
Further, in above-mentioned projection screen provided in an embodiment of the present invention, the first lenticule 311 and the second lenticule
312 material is optics plastic cement or optical glass., can be by mould by microlens layer 31 all first in manufacturing process
Lenticule 311 is integrally formed, then the second all lenticules 312 is integrally formed, then by each first lenticule 311 of shaping
Gluing is carried out to form microlens layer 31 by optical cement with each second lenticule；Or can also to make each first respectively micro-
The lenticule 312 of lens 311 and second, then each lenticule 312 of first lenticule 311 and second is subjected to glued composition microlens layer
31.In practical application, carrying out the making of microlens layer 31 to simplify the preferable first way of process complexity, and form micro-
The first lenticule 311 and the second lenticule 312 of lens jacket 31 can use optics plastic cement or optical glass to be made.In addition,
Above-mentioned microlens layer is made using other preparation methods and material and reaches the situation of respective action of the present invention, is not limited herein
It is fixed.
In the specific implementation, in above-mentioned projection screen provided in an embodiment of the present invention, the thickness of Fresnel Lenses layer 34
It can be 100-200 μm.In practical application, Fresnel Lenses layer 34 can be the thin slice formed by the material injection pressure such as polyolefin,
The integral thickness of projection screen can be adapted it in manufacturing process by its thickness control within 100-200 μm.Certainly, also
The thickness of Fresnel Lenses layer 34 can be adjusted according to the actual requirements, and the embodiment of the present invention is not limited its specific Thickness
It is fixed.
At the same time, to ensure that the integral thickness of projection screen is unlikely to excessive, the thickness of microlens layer 31 can be 150-
300μm.In actual applications, the first lenticule 311 and the second lenticule 312 in each lenticule group of microlens layer 31 are formed
Can be low dispersion concavees lens structure and high dispersion convex lens structures combination, can will be above-mentioned convex to be adapted to concrete application
Lens arrangement can be made as biconvex lens structure or planoconvex spotlight structure；Concavees lens structure can be made as biconcave lens structure or flat
Concavees lens structure, both single thickness are to be adapted to application to be defined, the requirement of no strict numerical, and be by the weight of projection screen and
Fixing fabric structure between the thickness after two kinds of lenticule gluings being can be controlled in into 150-300 μm, is making within zone of reasonableness
During, the thickness of the first lenticule 311 and the second lenticule 312 can be adjusted according to the actual requirements, so that lenticule group is whole
Body thickness meets the requirements.
Embodiment two,
As shown in Figure 2 C, a kind of rear projection screen structural representation of the prior art, camera lens projecting direction and screen image
Beam exit direction is consistent.As illustrated, along projection image's beam exit direction, successively by the He of Fresnel lens structure layer 11
Cylindrical lens configuration layer 12, the focal length of the focal length of projector and rear projection screen is matched during use, can be shown on rear projection screen
Picture.As shown in Figure 2 D, the light for being incident to screen is entered line convergence and collimated specific index path by Fresnel lens structure layer 11, post
Convex lens portions tap in shape lens arrangement layer 12 is received collimated ray and gone forward side by side line convergence, theoretical enterprising in the focal plane in convex lens
Row imaging, and be finally transmitted from cylindrical lens configuration layer 12 with the state dissipated after convergence.
It is improved, another projection screen that the embodiment of the present invention two provides, such as schemes for above-mentioned existing rear projection screen
Shown in 4A, including：Fresnel Lenses layer 41, lens pillar layer 42 and the microlens layer set gradually along projection lens light direction
43.The lenticule group of microlens layer 43 be set up in parallel including the first lenticule 431 and with the first lenticule 431 it is second micro-
Lens 432, wherein, the first lenticule 431 is negative lens, and the second lenticule 432 is positive lens, and the first lenticule 431
Abbe number is less than the abbe number of the second lenticule 432.
Specifically, the abbe number of the first lenticule 431 is less than the abbe number of the second lenticule 432, as it was previously stated, color
It is relevant with the making material of eyeglass to dissipate coefficient, and influences the refractive index of light beam, in embodiments of the present invention, the first lenticule 431
Refractive index be more than the second lenticule 432 refractive index.
In one embodiment, the first lenticule 431 can be biconcave lens, and the second lenticule 432 is planoconvex spotlight
Or it is biconvex lens；Or first lenticule 431 can be plano-concave lens, the second lenticule 432 is that biconvex lens or plano-convex are saturating
Mirror, those skilled in the art can select combinations thereof according to demand, to meet the needs of light path adjustment, and, further,
Above-mentioned first lenticule and the second lenticule can be non-spherical lens, or, the respective exiting surface of at least the above two lens
Surface is aspherical, can improve adjustability and the flexibility of light path design.
As shown in Figure 4 A, first lenticule 431 is plano-concave lens in microlens layer 43, the, two lenticules 432 are lenticular
Mirror.
Describe the operation principle of projection screen in detail below in conjunction with Fig. 4 A, Fig. 4 B.
Color offset phenomenon and reason according to described by embodiment one, from each primary color light bundles that lens pillar layer 42 is emitted in not
With the divergent state of degree, and cause the generation of color offset phenomenon, Producing reason and phenomenon in embodiment one it is stated that
This is repeated no more.
When each primary lights of diverging pass through microlens layer 43, light path schematic diagram is as shown in Figure 4 B.
The first lenticule 431 is incident to first in R, G, B tri-color beam of divergent state, and the first lenticule 431 is negative saturating
Mirror, light beam is dissipated, and due to relatively low abbe number, there is higher refractive index to each primary color light bundles, and
And each primary lights are also different when by the diverging of the first lenticule 431, specifically, the blue light B degrees of divergence in white light
Maximum, next to that green glow G, is finally feux rouges R, so as to the blue light B shown in Fig. 4 B, to dissipate deviation upwards the most serious.By
Being reentered after one lenticule 431 in each primary lights of divergent state and be incident upon the second lenticule 432, the second lenticule 432 is positive lens,
And abbe number is more than the first lenticule 431, so as to which refractive index is less than the first lenticule 431, i.e., in the aggregation procedure of light beam
Deviation degree it is relatively small.R, G, B three primary colours light are incident to the second lenticule 432 and reach the same point of exiting surface, outgoing
When, deviation degree still suffers from B light maximum, the minimum difference of R light, but is respectively less than the deviation degree through the first lenticule 431,
So that the most severe B light of original deviation, the downward deviation of the G light and R light of next is assembled, and makes the light direction one of three primary colours light
Cause, be finally converged to beam of white light.
By above-mentioned light path process, the first lenticule 431 and the second lenticule 432 are by setting different dispersion systems
Number, forms the difference of refractive index, the first lenticule 431 to the severity of beam divergence, and the second lenticule 432 light beam is carried out compared with
The convergence of low deviation degree, with the deviation difference that each primary lights to different wave length occur in the first lenticule 431 by compared with
The reverse deviation of small degree compensates, and makes the light of each primary lights of outgoing（R、G、B）Essentially coincide, substantially reduce difference
The degree of separation of the primary lights of wavelength, reduce dimensional energy distribution changes of the white light W after projection screen, so that white light
Colour cast under different visual angles reduces, and lifting shows the uniformity of color.
Schematic illustration is carried out in above-mentioned example only by taking beam of white light as an example, because projection screen is incided in projector
Light beam whether there is several, passes through the beam treatment of said process so that degree of divergence drops when being incident to the beam exit of projection screen
Low or elimination, so as to which when observing under different viewing angles, the light beam of human eye will not be entered because of primary lights light beam difference deviation
It is limited in scope and causes the phenomenon of colour cast.
In above-mentioned lenticule group in embodiments of the present invention, using different materials, make the dispersion of the first lenticule 431
Coefficient is more than the abbe number of the second lenticule 432, and with reference to above-mentioned concavees lens structure and convex lens structures, white light passes through first
Lenticule 431, to its each primary lights（R、G、B）Dissipated, because the abbe number of the first lenticule is smaller, each primary lights hair
Raw deviation differs greatly, and blue light B deviation degree is maximum, and feux rouges R deviations degree is minimum；Reentered in each primary lights and be incident upon
During two lenticules 432, because the second lenticule 432 is the convex lens structures with higher abbe number so that micro- second
It is also maximum that refractive indexes of the blue light B of at utmost deviation when by the first lenticule 431 occurs in lens 432, convex lens knot
Converging action more other primary lights of first lenticule 431 of structure to it are also maximum, and similarly, the converging action to feux rouges R is minimum,
So that focal lengths of the blue light B in the first lenticule 431 is elongated, focal lengths of the feux rouges R in the first lenticule 431 shortens, by
This, approaches the focal length of each primary lights of outgoing, so as to reduce degree of separation during each primary lights outgoing.
Specifically, in above-mentioned projection screen provided in an embodiment of the present invention, the abbe number of the first lenticule 431 can be
10-40；The abbe number of second lenticule 432 can be 40-80.By it is foregoing can to explanation of the white light Jing Guo lenticule group light path
Know, divergence of beam effect and high dispersion due to the first lenticule 431（Abbe number is smaller）So that each primary lights in white light W
（R、G、B）Degree of separation it is larger, and the second lenticule 432 with convergence of rays act on and with relatively low dispersion（Abbe number
It is larger）So that separated each primary lights originally（R、G、B）Light essentially coincided together after convergence.Therefore, second is micro-
Difference of the lenticule 431 of mirror 432 and first on abbe number, make the first lenticule 431 to by each of the second lenticule 432
The deviation difference of primary lights has compensating action.In the specific implementation, can be above-mentioned using different materials making according to being actually needed
The first lenticule 431 and the second lenticule 432 so that the abbe number of the first lenticule 431 is less than the second lenticule 432
Abbe number, so that the first lenticule 431 is high dispersion concavees lens, the first lenticule 432 is low dispersion convex lens.In addition,
The abbe number of the first lenticule 431 and the second lenticule 432 can be also adjusted in the range of above-mentioned abbe number, the present invention is real
Example is applied not to be defined the specific value of the abbe number of each lenticule.
In the specific implementation, in above-mentioned projection screen provided in an embodiment of the present invention, as illustrated in figures 4 a and 4b, first is micro-
Lens 431 are brought into close contact with the second lenticule 432.In actual applications, the first lenticule 431 and the second lenticule 432 can be adopted
Fit together with the mode of gluing, its depolarized principle is as described above, here is omitted.
In addition, as shown in Figure 4 C, there may be between the first lenticule 431 and the second lenticule 432 in lenticule group
The gap of pre-determined distance, now, as shown in Figure 4 C, specifically, white light W is entering index path when white light W incides lenticule group
It is mapped to the first lenticule 431 to dissipate afterwards, due to each primary lights in white light W（R、G、B）In the first lenticule 431
Refractive index difference causes the deviation degree of each primary lights that difference, each primary lights after the first lenticule 431 occur（R、G、B）
Incided behind the air gap through the first lenticule 431 and the second lenticule 432 in the second lenticule 432, first is micro-
Lens 431 have higher abbe number relative to the second lenticule 432 so that the meeting in the first lenticule 432 of each primary lights
It is poly-, and lesser degree of reverse deviation occurs, so that each primary lights in the white light W of outgoing（R、G、B）Essentially coincide.
It is micro- when certain interval be present between the first lenticule 431 and the second lenticule 432 it can be seen from Fig. 4 C
Microscope group can carry out deviation to inciding lenticule group close to the light of edge, therefore, using the second lenticule of gap setting 432
Being applied to lenticule microscope group with the first lenticule 431 has a case that larger aperture, in practical application, can be according to being actually needed
Using any setting lenticule group of above two mode, the white light colour cast Jing Guo lenticule group is eliminated.
Further, in above-mentioned projection screen provided in an embodiment of the present invention, the first lenticule 431 and the second lenticule
432 material is optics plastic cement or optical glass., can be by mould by microlens layer 43 all first in manufacturing process
Lenticule 431 is integrally formed, and the second all lenticules 432 is integrally formed, then by each first lenticule of shaping
431 and each second lenticule 432 carry out glued forming microlens layer 43 by optical cement；Or it can also make respectively each
First lenticule 431 and the second lenticule 432, then that each lenticule 432 of first lenticule 431 and second is carried out into glued composition is micro-
Lens jacket 43.In practical application, to simplify the making that the preferable first way of process complexity carries out microlens layer 43, and
The first lenticule 431 and the second lenticule 432 for forming microlens layer 43 can use optics plastic cement or optical glass to be made.
In addition, above-mentioned microlens layer is made using other preparation methods and material and reaches the situation of respective action of the present invention, herein
Do not limit.
And in scheme of the embodiment of the present invention, by the first lenticule in microlens layer and the second lenticule
Abbe number carries out different settings so that two positive and negative lens carry out disparity compensation during the deviation to light beam, improve different
The registration of primary color light bundles.
And in the specific implementation, in above-mentioned projection screen provided in an embodiment of the present invention, lens pillar layer 42 with it is micro-
Certain spacing may be present between lens jacket 43, for example, can be at a distance of 1-5mm between lens pillar layer 42 and microlens layer 43.
In practical application, the gap between lens pillar layer 42 and microlens layer 43 can use refractive index to be filled for 1 transparent material；Or
Person, also above-mentioned spacing can be kept to be fixed lens pillar layer 42 and microlens layer 43 by outer peripheral fixture, now,
Air between the two serves as the transparent material that above-mentioned refractive index is 1.Between lens pillar layer 42 and microlens layer 43 away from
Can be adjusted from the making demand and imaging standards according to projection screen, under normal circumstances between the two can at a distance of 3-5mm,
During practical application, it can be adjusted flexibly, not limit herein.
Further, in above-mentioned projection screen provided in an embodiment of the present invention, the thickness of Fresnel Lenses layer 41 can be
50-200μm.In practical application, Fresnel Lenses layer 41 can be the thin slice formed by the material injection pressure such as polyolefin, making
Its thickness control within 50-200 μm, is adapted it to the integral thickness of projection screen by Cheng Zhongke.Certainly, can also be according to reality
The thickness of border demand adjustment Fresnel Lenses layer 41, the embodiment of the present invention are not defined to its specific Thickness.
At the same time, to ensure that the integral thickness of projection screen is unlikely to excessive, the thickness of microlens layer can be 100-300
μm.In actual applications, as shown in Figure 4 A, the first lenticule 431 and second in each lenticule group of microlens layer 43 is formed
Lenticule 432 can be low dispersion concavees lens structure and high dispersion convex lens structures combination, for be adapted to concrete application, can will
Above-mentioned convex lens and the concrete shape of concavees lens structure are combined use, and both single thickness are defined by suitable application,
Without strict numerical requirement, and it is to control the weight and volume of projection screen within zone of reasonableness, can be by two kinds of lenticule glue
Thickness after conjunction is can be controlled between 100-300 μm, in manufacturing process, can adjust the first lenticule 431 according to the actual requirements
With the thickness of the second lenticule 432 so that the integral thickness of lenticule group meets the requirements.
It should be noted that in above-mentioned projection screen provided in an embodiment of the present invention, light direction refers to projected-beam entrance
The direction being emitted into projection screen；The optical axis of Fresnel Lenses layer, lens pillar layer and microlens layer should keep flat
OK, each microlens structure being set up in parallel preferably.
Embodiment three,
The embodiment of the present invention three is based on the basis of embodiment one, it is proposed that a kind of large scale splices projection screen, such as Fig. 5 institutes
Show.
Large scale Mosaic screen shown in Fig. 5, can be with the positive throwing projection screen in Application Example one, i.e. projector equipment
Projection screen side is respectively positioned on user, what user observed is the image for entering human eye formation by screen reflection.
Or the large scale Mosaic screen shown in Fig. 5, can be with the rear-projection projection screen in Application Example one, i.e. projection
Equipment and user are located at projection screen both sides respectively, and what user observed is to transmit the image formed into human eye by screen.
Because the large scale Mosaic screen applies the projection screen technical scheme described in embodiment one or embodiment two,
It can reduce during so as to realize multi-screen splicing because splicing picture color is uneven caused by unit mosaic screen color offset phenomenon is serious,
Colour cast, lifting large scale projected picture show the uniformity of color.
Example IV,
Projection screen embodiment based on embodiment one, the embodiment of the present invention provide a kind of optical projection system.
In actual applications, after the focal length of the focal length of projector and projection screen is matched image can be carried out to show.Adopt
When carrying out image display with optical projection system provided in an embodiment of the present invention, space of the white light after projection screen can be effectively reduced
Energy distribution difference, its white light colour cast is relatively low, and lifting shows the uniformity of color.
As shown in fig. 6, in above-mentioned optical projection system provided in an embodiment of the present invention, including during laser projection, the projection
System is laser projection system.Wherein, laser projection can be ultrashort burnt laser projection.
Projection screen provided in an embodiment of the present invention and optical projection system, including：Along projected-beam entrance to projection screen
Microlens layer 61, dyed layer 62, diffusion layer 63, Fresnel Lenses layer 64 and the reflecting layer 65 that direction is set gradually.Lenticule
Layer 61 includes：Multiple is in the compact arranged lenticule group of array distribution；Lenticule group includes：Along projected light beam exit direction successively
The first lenticule 611 and the second lenticule 612 set；The abbe number of first lenticule 611 is less than the second lenticule 612
Abbe number；First lenticule 611 is used to dissipate each primary lights in incident ray；Second lenticule 612 be used for pair
Each primary lights enter line convergence, to reduce the deviation difference of each primary lights after the convergence of the first lenticule；It is anti-by reflecting layer
The light penetrated is incident to human eye after microlens layer again.
The process for carrying out eliminating colour cast and principle are combined foregoing for the first microlens layer 611 and the second lenticule 612
It is stated that will not be repeated here in embodiment.
Thus, above-mentioned projection screen provided in an embodiment of the present invention reduce in white light each primary lights due to deviation difference and
Dimensional energy distribution is caused to change, thus, each primary lights proportion in white light keeps constant, can't be with the increasing at visual angle
Add and colour temperature difference occurs, will not also cause colour cast of the white light under different visual angles, lifting shows the uniformity of color.
Embodiment five,
Projection screen embodiment based on embodiment two, the embodiment of the present invention provide a kind of optical projection system.
The optical projection system can be projection splice displaying system, and the projector of optical projection system can be laser projection, in reality
Image can be carried out in, after the focal length of the focal length of projector and projection screen is matched to show.
Specifically, can with as shown in fig. 7,
Specifically, projection screen provided in an embodiment of the present invention and optical projection system, including：Set gradually along light direction
Fresnel Lenses layer 71, lens pillar layer 72 and microlens layer 73.
Microlens layer includes：Multiple lenticule groups in array distribution；Lenticule group includes：Along projection image's beam exit
The first lenticule 731 and the second lenticule 732 that direction is set gradually, the first lenticule 731 are used for each in incident ray
Primary lights are dissipated, and the second lenticule 732 is used to enter line convergence to each primary lights.
In each lenticule group in above-mentioned microlens layer provided in an embodiment of the present invention, each primary colours in white light incident ray
Disperse function is produced to each primary lights when light passes through the first lenticule, makes each primary lights that different degrees of and larger deviation occur
After incide the second lenticule, because the second lenticule has higher abbe number, therefore can be right relative to the first lenticule
Each primary colours light after incident diverging carries out the converging action of lower degree, reduces each primary colours as caused by the first lenticule
The deviation difference of light, so as to white light in the first lenticule caused each primary colours light deflection difference pass through it is lesser degree of reversely
Compensated after deviation, essentially coincide each primary lights of the different wave length of outgoing, reduce white light after above-mentioned projection screen
Dimensional energy distribution change so that colour cast of the white light under different visual angles reduces, lifting shows the uniformity of color.
As a result of the projection screen in above-described embodiment two, optical projection system of the embodiment of the present invention carries out image and shown
When, dimensional energy distribution difference of the white light after projection screen can be effectively reduced, white light colour cast is relatively low under different visual angles, carries
Rise the uniformity for showing color.
Obviously, those skilled in the art can carry out the essence of various changes and modification without departing from the present invention to the present invention
God and scope.So, if these modifications and variations of the present invention belong to the scope of the claims in the present invention and its equivalent technologies
Within, then the present invention is also intended to comprising including these changes and modification.
Claims (8)
1. it is front projection screen a kind of projection screen, including dyed layer, diffusion layer, Fresnel Lenses layer and reflecting layer, its feature
It is, in addition to the microlens layer positioned at Fresnel Lenses layer light emission side；The microlens layer includes：Multiple is in array distribution
Lenticule group；
Along projection image's beam exit direction, the lenticule group includes successively：First lenticule, first lenticule is negative
Lens, and the second lenticule, second lenticule are positive lens,
The abbe number of first lenticule is less than the abbe number of the second lenticule；
Wherein, the projection image's light beam incident microlens layer, dyed layer, diffusion layer, Fresnel Lenses layer, and described in warp successively
Turned back after the reflection of reflecting layer, again pass by the Fresnel Lenses layer, diffusion layer, dyed layer, and finally through the microlens layer
Enter human eye after outgoing.
2. projection screen as claimed in claim 1, it is characterised in that first lenticule is biconcave lens structure or plano-concave
Lens arrangement, second lenticule are biconvex lens structure or planoconvex spotlight structure.
3. projection screen as claimed in claim 1, it is characterised in that first lenticule and second lenticule are close
Fitting or between the gap of pre-determined distance be present.
4. projection screen as claimed in claim 1, it is characterised in that the abbe number of second lenticule is 30-80；Institute
The abbe number for stating the first lenticule is 10-30.
5. projection screen as claimed in claim 1, it is characterised in that first lenticule and/or second lenticule
Material be optics plastic cement or optical glass.
6. projection screen as claimed in claim 1, it is characterised in that first lenticule, the second lenticule are aspherical
Lens.
7. a kind of large scale Mosaic screen, it is characterised in that including any described projection screens of polylith such as claim 1-6.
8. a kind of optical projection system, including laser projection device, it is characterised in that also include as described in claim any one of 1-7
Projection screen.
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| CN107728419A (en) * | 2016-08-11 | 2018-02-23 | 海信集团有限公司 | A kind of projection screen and optical projection system |
| CN106647138A (en) * | 2016-10-31 | 2017-05-10 | 海信集团有限公司 | Projection screen and projection system |
| CN106647140A (en) * | 2016-10-31 | 2017-05-10 | 海信集团有限公司 | Projection screen and projection system |
| CN106338878A (en) * | 2016-11-16 | 2017-01-18 | 四川长虹电器股份有限公司 | Short-focus positive-projection display screen |
| CN106842799A (en) * | 2016-12-27 | 2017-06-13 | 海信集团有限公司 | A kind of rear projection screen and optical projection system |
| CN106652807A (en) * | 2017-01-03 | 2017-05-10 | 京东方科技集团股份有限公司 | Splicing display screen and display method thereof and display device |
| CN108150966A (en) * | 2017-12-26 | 2018-06-12 | 汉舟四川环保科技有限公司 | Optical illumination lenses based on micro-nano structure |
| CN111427229A (en) * | 2018-12-20 | 2020-07-17 | 青岛海信激光显示股份有限公司 | Projection screen and projection system |
| CN110209007A (en) * | 2019-05-28 | 2019-09-06 | 深圳市真屏科技发展有限公司 | Reflective anti-light projection screen |
| CN112485902B (en) * | 2019-09-11 | 2023-07-21 | 深圳光峰科技股份有限公司 | Optical film and optical imaging system |
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| JPS60209728A (en) * | 1984-04-03 | 1985-10-22 | Mitsubishi Electric Corp | Screen |
| KR960015507B1 (en) * | 1991-12-24 | 1996-11-14 | 가부시끼가이샤 히다찌세이사꾸쇼 | An image display apparatus of back projector type and a screen of back projector type |
| JPH06250291A (en) * | 1993-02-26 | 1994-09-09 | Hitachi Ltd | Two-dimensional moire decreasing type projection type display |
| DE60034283T2 (en) * | 1999-08-26 | 2007-08-30 | KURARAY CO., LTD, Kurashiki | Method for producing a curved film for transmitted-light projection screens |
| JP2003004905A (en) * | 2001-06-18 | 2003-01-08 | Toppan Printing Co Ltd | Both-side lens sheet, rear type projection screen and display device using it |
| KR100841438B1 (en) * | 2006-12-29 | 2008-06-26 | 정현인 | Positive lens sheet of flat surface |
| CN203786458U (en) * | 2014-04-21 | 2014-08-20 | 刘文华 | Self-cleaning laser orthographic projection screen |
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