CN107728420A - A kind of rear projection screen and optical projection system - Google Patents
A kind of rear projection screen and optical projection system Download PDFInfo
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- CN107728420A CN107728420A CN201610654119.XA CN201610654119A CN107728420A CN 107728420 A CN107728420 A CN 107728420A CN 201610654119 A CN201610654119 A CN 201610654119A CN 107728420 A CN107728420 A CN 107728420A
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- lenticule
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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
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Abstract
The invention discloses a kind of rear projection screen and optical projection system, including：The Fresnel Lenses layer and microlens layer set gradually along light direction；Lenticule group in microlens layer includes：The first lenticule and the second lenticule set gradually along light direction；The abbe number of first lenticule is more than the abbe number of the second lenticule, first lenticule is used to enter line convergence to each primary lights in incident ray, second lenticule is used to dissipate each primary lights, to reduce the deviation difference of each primary lights after the convergence of the first lenticule.Because the second lenticule relative to the first lenticule has less abbe number, therefore a greater degree of disperse function can be carried out to each primary colours light after the convergence of incidence relative to the first lenticule, so as to which to white light, caused each primary colours light deflection difference compensates in the first lenticule, essentially coincide each primary lights of outgoing, reduce dimensional energy distribution change of the white light after rear projection screen, reduce colour cast.
Description
Technical field
The present invention relates to display technology field, espespecially a kind of rear projection screen and optical projection system.
Background technology
In rear-projection display field, especially rear-projection tiled display field, generally use has micro fresnel lenses structure
Rear projection screen, as shown in Figure 1a, for the optical texture of the conventional rear projection screen with Fresnel Lenses and lens pillar, make
Used time by the focal length of the focal length of projector and rear projection screen match, can on rear projection screen display picture.
But using the test of colour cast and colour temperature after LED projection machine and laser projection collocation rear projection screen in actual measurement
As a result as shown in fig. 1b and fig. lc, from Fig. 1 b and Fig. 1 c test structure, in center's point of screen, i.e. horizontal view angle is at 0
Colour cast be 0, white colour temperature is minimum, and as the increase of horizontal view angle, caused colour cast and colour temperature can also increase therewith.Carrying on the back
Throw in display field, especially rear-projection tiled display field, no matter white field on rear projection screen with horizontal view angle or vertically regards
Angle can all have the problem of colour cast, i.e., as visual angle increases, white field chromaticity coordinates moves to the lower left corner of CIE1931 chromatic diagrams, makes
Gradually increase into white colour temperature, this results in human eye and colour cast be present in different visual angles or diverse location viewing display picture, especially
It is in being shown for large screen splicing, uses more scene, such as the PPT displayings of large conference room, difference to regard for white field
The colour cast of angle or diverse location can substantially reduce the experience of user.
Therefore, how to effectively reduce rear 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 rear projection screen and projection arrangement, to reduce rear projection screen in display picture
Colour cast phenomenon under different visual angles.
In a first aspect, the embodiment of the present invention provides a kind of rear projection screen, including：The Fresnel set gradually along light direction
Lens jacket and microlens layer；
The microlens layer includes：Multiple is in the compact arranged lenticule group of array distribution；
The lenticule group includes：The first lenticule and the second lenticule set gradually along light direction；Described first
The abbe number of lenticule is more than the abbe number of second lenticule；
First lenticule is used to enter line convergence to each primary lights in incident ray；Second lenticule be used for pair
Each primary lights are dissipated, to reduce the deviation difference of each primary lights after first lenticule convergence；
The incident ray is incident to human eye after the microlens layer.
In a kind of possible implementation, in above-mentioned rear projection screen provided in an embodiment of the present invention, described first is micro-
The abbe number of lens is 40-80；The abbe number of second lenticule is 10-40.
In a kind of possible implementation, in above-mentioned rear projection screen provided in an embodiment of the present invention, described first is micro-
Lens are brought into close contact with second lenticule.
In a kind of possible implementation, in above-mentioned rear projection screen provided in an embodiment of the present invention, described first is micro-
The gap of pre-determined distance between lens and second lenticule be present.
In a kind of possible implementation, in above-mentioned rear projection screen provided in an embodiment of the present invention, described first is micro-
The material of lens and second lenticule is optics plastic cement or optical glass.
Second aspect, the embodiment of the present invention provide a kind of rear projection screen, including：The Fresnel set gradually along light direction
Lens jacket, the first microlens layer and the second microlens layer；
First microlens layer includes：Multiple the first lenticule groups in array distribution；
The first lenticule group includes：The first lenticule and the second lenticule set gradually along light direction；It is described
The abbe number of first lenticule is more than the abbe number of second lenticule；
Second microlens layer includes：Multiple the second lenticule groups in array distribution；
The second lenticule group includes：The 3rd lenticule and the 4th lenticule set gradually along light direction；It is described
The abbe number of 3rd lenticule is less than the abbe number of the 4th lenticule；
First lenticule is used to enter line convergence to each primary lights in incident ray；Second lenticule be used for pair
Each primary lights are dissipated, to reduce the deviation difference of each primary lights after first lenticule convergence；
3rd lenticule is used for being dissipated by each primary lights of second lenticule；Described 4th is micro-
Mirror is used to enter line convergence to each primary lights, to reduce the inclined of each primary lights after the 3rd lenticule diverging
Roll over difference；
The incident ray is incident to human eye after first microlens layer and second lenticule.
In a kind of possible implementation, in above-mentioned rear projection screen provided in an embodiment of the present invention, described first is micro-
The abbe number of lens is equal with the abbe number of the 4th lenticule；Or
The abbe number of first lenticule is less than the abbe number of the 4th lenticule.
In a kind of possible implementation, in above-mentioned rear projection screen provided in an embodiment of the present invention, described first is micro-
There is prepsetting gap between lens jacket and second microlens layer.
The third aspect, the embodiment of the present invention provide a kind of optical projection system, including any of the above-described rear projection screen.
Fourth aspect, the embodiment of the present invention provide a kind of optical projection system, including any of the above-described rear projection screen.
The present invention has the beneficial effect that：
Rear projection screen provided in an embodiment of the present invention and optical projection system, including：The Fresnel set gradually along light direction
Lens jacket and microlens layer；Microlens layer includes：Multiple lenticule groups in array distribution；Lenticule group includes：Along light extraction side
To the first lenticule and the second lenticule set gradually, the first lenticule is used to enter guild to each primary lights in incident ray
Poly-, the second lenticule is used to dissipate each primary lights, to reduce each primary lights after the convergence of the first lenticule because
Refractive index is different and caused deviation difference.The light of different wave length is rolled in lens in white light due to projecting rear projection screen
The difference of rate is penetrated, causes the refractive direction of the primary colours light of the different wave length through lens that difference occurs and produces colour cast.
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
Converging action is produced to each primary lights when light passes through the first lenticule, each primary lights is incided after different degrees of deviation occurs
Second lenticule, because the second lenticule has less abbe number, therefore can be to the meeting of incidence relative to the first lenticule
Each primary colours light after poly- carries out a greater degree of disperse function, reduces the deviation of each primary lights as caused by the first lenticule
Difference, so as to which caused each primary colours light deflection difference compensates in the first lenticule to white light, make the different wave length of outgoing
Each primary lights essentially coincide, cause dimensional energy distribution to change due to deviation difference so as to reduce each primary lights in white light,
Thus, each primary lights proportion in white light keeps constant, colour temperature difference can't occur with the increase at visual angle, also not
Colour cast of the white light under different visual angles can be caused, lifting shows the uniformity of color.
Brief description of the drawings
Fig. 1 a are the structural representation of rear projection screen in the prior art；
Change curves of Fig. 1 b for the white field colour cast of rear projection screen in the prior art with horizontal view angle；
Change curves of Fig. 1 c for rear projection screen white colour temperature in the prior art with horizontal view angle；
Fig. 2 is one of structural representation of rear projection screen in the embodiment of the present invention；
Fig. 3 a are the index path of rear projection screen in the prior art；
Fig. 3 b be white light after rear projection screen in the prior art each primary colours brightness with horizontal view angle change curve；
Fig. 4 is one of the index path of white light Jing Guo lenticule group in the embodiment of the present invention；
Fig. 5 is the index path that white light passes through rear projection screen in Fig. 2；
Fig. 6 is two of index path of the white light Jing Guo lenticule group in the embodiment of the present invention；
Fig. 7 is two of the structural representation of rear projection screen in the embodiment of the present invention；
Fig. 8 is three of index path of the white light Jing Guo lenticule group in the embodiment of the present invention；
Fig. 9 is the index path for the rear projection screen that white light passes through in Fig. 7.
Embodiment
The embodiment of the present invention provides a kind of rear projection screen and projection arrangement, is produced to reduce rear 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 rear projection screen of specific embodiment of the invention offer is provided below in conjunction with the accompanying drawings.
Embodiment one
As shown in Fig. 2 rear projection screen provided in an embodiment of the present invention, including：The Fresnel set gradually along light direction
Lens jacket 21 and microlens layer 22；
Microlens layer 22 includes：Multiple lenticule groups in array distribution；
Lenticule group includes：The first lenticule 221 and the second lenticule 222 set gradually along light direction；
Second lenticule 222 is used to reduce each primary lights in the incident ray for entering line convergence by the first lenticule 221
Deviation difference；
Incident ray is incident to human eye after microlens layer.
Can be in the white field colour cast of life of the diverse location of screen when rear projection screen uses post lens in the prior art, this is due to
The wavelength of different base colors light (feux rouges R, green glow G, blue light B) in white light is different, in the post lens in by rear projection screen
Refractive index is different and then causes dimensional energy distribution of the white light after screen to be changed.As shown in Figure 3 a, passed through for white light W
The light path schematic diagram of each primary lights after the Fresnel Lenses layer and lens pillar layer of rear projection screen is crossed, wherein, blue light B wavelength is most
Short, thus refractive index is maximum, the extent of refraction after screen is maximum so that dimensional energy distribution is more after screen by blue light B
Broadness, and the most long feux rouges R of wavelength because refractive index minimum the dimensional energy distribution angle after screen is smaller.Such as figure
The brightness of each primary lights of 3b is as the change curve of horizontal view angle is it can also be seen that white light blue light B angular distribution maximum, feux rouges
Angular distribution it is minimum.Therefore, gradually increase as visual angle increases ratios of the blue light B in white light, colour temperature more and more higher, white field
There occurs the colour cast to high color temperature direction.
In above-mentioned rear projection screen provided in an embodiment of the present invention, using the lenticule group of array distribution, thrown by projector
The white light index path being mapped in lenticule group is as shown in figure 4, wherein, W represents the white light being emitted by projector, R, G, B difference table
Showing has feux rouges, green glow and the blue light of different wave length in white light.As shown in figure 4, the primary lights of different wave length are in lens in white light W
Middle refractive index has differences, and therefore, feux rouges R, green glow G and the blue light B with different wave length assemble by the first lenticule 221
Focal length afterwards is also different, wherein, blue light B wavelength is most short, maximum by the degree of its deviation during the first lenticule 221,
Therefore its focal length is most short；And feux rouges R wavelength is most long, minimum by the degree of its deviation during the first lenticule 221, its focal length is most
Greatly.Thus, after the converging action by the first lenticule 221, the deviation journey of feux rouges R, green glow G and blue light B in white light
Difference occurs for degree.And the second lenticule 222 has less abbe number relative to the first lenticule 221, therefore relative to
One lenticule can carry out a greater degree of diverging to each primary colours light (feux rouges R, green glow G and blue light B) after the convergence of incidence and make
With when white light is incident to the second lenticule by the first lenticule 221, the second lenticule is directed to the first lenticule 221, right
The deviation difference that each primary lights of different wave length occur in the first lenticule 221 compensates, and makes each primary lights of outgoing
Light (R, G, B) essentially coincides, and substantially reduces the degree of separation of the primary lights of different wave length, makes each primary lights in white light W
Deviation angle is basically identical, causes dimensional energy distribution to change due to deviation difference so as to reduce each primary lights in white light W, by
This, each primary lights proportion in white light keeps constant, and colour temperature difference can't occur with the increase at visual angle, also will not
Cause colour cast of the white light under different visual angles, lifting shows the uniformity of color.
In the specific implementation, as shown in figure 4, the first lenticule 221 in above-mentioned lenticule group can use convex lens knot
Structure, the second lenticule can use concavees lens structure, and the lenticule of concavees lens structure second has disperse function, can will pass through convex lens
Larger deflection of light difference reduces caused by each primary lights after first lenticule 221 of structure so that after lenticule group
The degree of separation of each primary lights in white light reduces.As shown in figure 5, white light passes through above-mentioned rear projection screen provided in an embodiment of the present invention
Backstage, the deviation degree of each primary lights of different wave length is basically identical, thus, when watching above-mentioned rear projection screen under different visual angles
Caused colour cast reduces, and improves the uniformity of display color.
Further, in above-mentioned rear projection screen provided in an embodiment of the present invention, the abbe number of the first lenticule 221 is big
In the abbe number of the second lenticule 222.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 221
Coefficient is more than the abbe number of the second lenticule 222, with reference to above-mentioned convex lens structures and concavees lens structure, makes white light by the
One lenticule 221, line convergence is entered to its each primary lights (R, G, B), because the abbe number of the first lenticule is larger, each primary lights
The difference that deviation occurs will not be excessive, and blue light B deviation degree is maximum, and feux rouges R deviations degree is minimum；It is incident in each primary lights
During to the second lenticule 222, because the second lenticule 222 is the concavees lens structure with less abbe number so that
It is maximum that refractive indexes of the blue light B of at utmost deviation when by the second lenticule 222 occurs in one lenticule 221, concavees lens
Second lenticule 222 of structure is also maximum to its more other primary lights of disperse function, similarly, to feux rouges R disperse function most
Small, so that focal lengths of the blue light B in the second lenticule 222 is elongated, focal lengths of the feux rouges R in the second lenticule 222 shortens,
Thus, approach the focal length of each primary lights of outgoing, reduce degree of separation during each primary lights outgoing.
Specifically, in above-mentioned rear projection screen provided in an embodiment of the present invention, the abbe number of the first lenticule 221 can be
40-80；The abbe number of second lenticule 222 can be 10-40.By it is foregoing can to explanation of the white light Jing Guo lenticule group light path
Know, because the convergence of rays effect and low dispersion (abbe number is larger) of the first lenticule 221 cause each primary lights in white light W
The degree of separation of (R, G, B) is smaller, and the second lenticule 222 acts on divergence of beam and with higher dispersion (abbe number
It is smaller) so that the light of separated each primary lights (R, G, B) essentially coincided together originally.Therefore, the second lenticule 222 with
Difference of first lenticule 221 on abbe number, make the second lenticule 222 to each primary lights by the first lenticule 221
Deviation difference there is compensating action.In the specific implementation, above-mentioned first can be made using different materials according to being actually needed
The lenticule 222 of lenticule 221 and second, so that the abbe number of the first lenticule 221 is more than the dispersion system of the second lenticule 222
Number, so that the first lenticule 221 is low dispersion convex lens, the second lenticule 222 is high dispersion concavees lens.In addition, can also be
The abbe number of the first lenticule 221 and the second lenticule 222 is adjusted in the range of above-mentioned abbe number, the embodiment of the present invention is not
The specific value of the abbe number of each lenticule is defined.
In the specific implementation, in above-mentioned rear projection screen provided in an embodiment of the present invention, as shown in figure 4, the first lenticule
221 are brought into close contact with the second lenticule 222.In actual applications, the first lenticule 221 and the second lenticule 222 can use glue
The mode of conjunction fits together, and its depolarized principle is as described above, here is omitted.
In addition, as shown in fig. 6, there may be between the first lenticule 221 and the second lenticule 222 in lenticule group pre-
If the gap of distance, now, index path when white light W incides lenticule group is as shown in fig. 6, specifically, white light W is being incided
Assembled after first lenticule 221, due to refraction of each primary lights (R, G, B) in the first lenticule 221 in white light W
Rate difference causes the deviation degree of each primary lights that difference occurs, and each primary lights (R, G, B) after the first lenticule 221 pass through
Incided behind the air gap between first lenticule 221 and the second lenticule 222 in the second lenticule 222, the second lenticule
222 have relatively low abbe number relative to the first lenticule 221 so that and each primary lights dissipate in the second lenticule 222, and
Largely reverse deviation occurs, so that each primary lights (R, G, B) essentially coincide in the white light W of outgoing.It can be seen by Fig. 6
Go out, when certain interval be present between the first lenticule 221 and the second lenticule 222, lenticule group can be to inciding lenticule
Group carries out deviation close to the light of edge, therefore, is applicable using gap setting the first lenticule 221 and the second lenticule 222
There is larger aperture in lenticule microscope group, in practical application, above two mode can be used according to being actually needed
Any setting lenticule group, eliminates the white light colour cast Jing Guo lenticule group.
Further, in above-mentioned rear projection screen provided in an embodiment of the present invention, the first lenticule 221 and the second lenticule
222 material is optics plastic cement or optical glass., can be by mould by microlens layer 22 all first in manufacturing process
Lenticule 221 is integrally formed, then the second all lenticules 222 is integrally formed, then by each first lenticule 221 of shaping
Gluing is carried out to form microlens layer 22 by optical cement with each second lenticule；Or can also to make each first respectively micro-
The lenticule 222 of lens 221 and second, then each lenticule 222 of first lenticule 221 and second is subjected to glued composition microlens layer
22.In practical application, carrying out the making of microlens layer 22 to simplify the preferable first way of process complexity, and form micro-
The first lenticule 221 and the second lenticule 222 of lens jacket 22 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 rear projection screen provided in an embodiment of the present invention, as shown in Fig. 2 Fresnel Lenses
Certain spacing may be present between layer 21 and microlens layer 22, for example, can phase between Fresnel Lenses layer 21 and microlens layer 22
Away from 3-5mm.In actual applications, the gap between Fresnel Lenses layer 21 and microlens layer 22 can use refractive index for 1 it is saturating
Bright material filling；Or also Fresnel Lenses layer 21 and microlens layer 22 can be kept above-mentioned by outer peripheral fixture between
Away from being fixed, now, air between the two serves as the transparent material that above-mentioned refractive index is 1.The He of Fresnel Lenses layer 21
Both the distance between microlens layer 22 can be adjusted according to the making demand and imaging standards of rear projection screen, under normal circumstances
Between in practical application, can be adjusted flexibly, can not limit herein at a distance of 3-5mm.
Further, in above-mentioned rear projection screen provided in an embodiment of the present invention, the thickness of Fresnel Lenses layer 21 can be
50-200μm.In practical application, Fresnel Lenses layer 21 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 rear projection screen by Cheng Zhongke.Certainly, can also be according to reality
The thickness of border demand adjustment Fresnel Lenses layer 21, the embodiment of the present invention are not defined to its specific Thickness.
At the same time, it is micro- only including one in rear projection screen to ensure that the integral thickness of rear projection screen is unlikely to excessive
During mirror layer 22, the thickness of single microlens layer can be 100-300 μm.In actual applications, each micro- of microlens layer 22 is formed
The first lenticule 221 and the second lenticule 222 in microscope group can be the convex lens structures of low dispersion and the concavees lens knot of high dispersion
The combination of structure, to be adapted to concrete application, above-mentioned convex lens structures can be made as to biconvex lens structure or planoconvex spotlight knot
Structure；Concavees lens structure can be made as biconcave lens structure or plano-concave lens structure, and both single thickness are defined by suitable application,
Without strict numerical requirement, and it is to control the weight and volume of rear 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 221 according to the actual requirements
With the thickness of the second lenticule 222 so that the integral thickness of lenticule group meets the requirements.
Embodiment two
Based on same inventive concept, the embodiment of the present invention provides a kind of optical projection system, and the optical projection system includes any of the above-described
Rear projection screen.The optical projection system can be rear-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 rear projection screen is matched to show.Using the embodiment of the present invention
When the optical projection system of offer carries out image display, dimensional energy distribution difference of the white light after rear projection screen can be effectively reduced,
Its white light colour cast is relatively low, and lifting shows the uniformity of color.
Embodiment three
Further to improve depolarized color effect, as shown in fig. 7, rear projection screen provided in an embodiment of the present invention includes：Including：
Fresnel Lenses layer 71, the first microlens layer 72 and the second microlens layer 73 set gradually along light direction；
First microlens layer 72 includes：Multiple the first lenticule groups in array distribution；
First lenticule group includes：The first lenticule 721 and the second lenticule 722 set gradually along light direction；The
The abbe number of one lenticule 721 is more than the abbe number of the second lenticule 722；
Second microlens layer 73 includes：Multiple the second lenticule groups in array distribution；
Second lenticule group includes：The 3rd lenticule 731 and the 4th lenticule 732 set gradually along light direction；The
The abbe number of three lenticules 731 is less than the abbe number of the 4th lenticule 732；
First lenticule 721 is used to enter line convergence to each primary lights in incident ray；Second lenticule 722 is used for each
Primary lights are dissipated, to reduce the deviation difference of each primary lights after the convergence of the first lenticule 721；
3rd lenticule 731 is used for being dissipated by each primary lights of the second lenticule 722；4th lenticule 732
For entering line convergence to each primary lights, to reduce the deviation difference of each primary lights after the diverging of the 3rd lenticule 731；
Incident ray is incident to human eye after the first microlens layer 72 and the second lenticule 73.
In the specific implementation, as shown in fig. 7, the first microlens layer 72 and the second microlens layer 73 are with micro- positioned at two
It is symmetrical set between mirror layer and perpendicular to the plane of optical axis.It is located at the first microlens layer by symmetrically arranged in white light W
72 and during second two lenticule groups in microlens layer 73, its index path is as shown in Figure 8.Due to each primary lights in white light
The refractive index difference of (R, G, B) in lens so that white light W is after the converging action of the first lenticule 721, each primary lights
The deviation degree of (R, G, B) produces different, wherein, blue light B deviation degree is maximum, and feux rouges R deviation degree is minimum；
Each primary lights are again after the disperse function of the second lenticule 722, because the second lenticule 722 is compared to the first lenticule 721
With less abbe number, therefore, the second lenticule 722 can be to having necessarily partially after the convergence of the first lenticule 721
Each primary lights for rolling over difference carry out a greater degree of disperse function, so that when having each primary lights outgoing of deviation difference originally
Deviation difference reduce, essentially coincide each primary lights during outgoing, so as to reach to the effect of the depolarized colors of white light entrance lens.
And when each primary lights (R, G, B) essentially coincided are again incident in the 3rd lenticule 731, due to the 3rd lenticule 731 and
As two lenticules 722, there is smaller abbe number, therefore, can be carried out to inciding each primary lights in the 3rd lenticule 731
Largely disperse function, so that each primary lights essentially coincided largely separate again, last each primary lights
Incide in the 4th larger lenticule 732 of abbe number and enter line convergence, because each primary lights are passing through the He of the 3rd lenticule 731
The process of 4th lenticule 732 is by the opposite process of the first lenticule 721 and the second lenticule 722, therefore, is essentially coincided
Or each primary lights with lesser degree deviation difference of speech can enter after the 3rd lenticule 731 and the 4th lenticule 732
Coincide together to one step, so that each primary lights being emitted by the 4th lenticule 732 are completely superposed.By projector to
The white light index path of rear projection screen is as shown in figure 9, as seen from Figure 9, in rear projection screen using the first microlens layer 72 and the
During the combination of two microlens layers 73, the light of white light W each primary lights of different wave length in the white light W after rear projection screen (R,
G, B) it is completely superposed.Thus, make the deviation angle of each primary lights in white light W basically identical, so as to reduce each primary lights in white light W
Dimensional energy distribution is caused to change due to deviation difference, each primary lights proportion in white light keeps constant, can't be with
The increase at visual angle and colour temperature difference occurs, will not also cause colour cast of the white light under different visual angles, lifting shows the one of color
Cause property.
In the specific implementation, low dispersion can be used positioned at the first lenticule 721 of both sides position and the 4th lenticule 732
Convex lens structures, two second lenticules 722 in position centre position and the 3rd lenticule 731 can use the concavees lens of high dispersion
Structure.Also, the parameter setting of the second microlens layer 72 and the 3rd lenticule 73 is slightly different.
In the specific implementation, the abbe number of the first lenticule 721 can be equal with the abbe number of the 4th lenticule 732；
Or first the abbe number of lenticule 721 be smaller than the abbe number of the 4th lenticule 732.In actual applications, first is micro-
The lenticule 732 of lens 721 and the 4th can use identical material, and its abbe number can be identical, and the curvature of the 4th lenticule 732
More than the curvature of the first lenticule 721, thus, the first lenticule 721 of the first convex lens structures and the shape of the 4th lenticule 732
Shape is different, makes the deviation that non-flat line direction occurs by the light of two microlens layers.Or first lenticule 721 and the 4th
Lenticule 732 can use the identical lens arrangement of shape, and now, the refractive index of the 4th lenticule 732 is less than first
The refractive index of lenticule 721, the i.e. abbe number of the 4th lenticule 732 are more than the abbe number of the first lenticule 721.
It should be noted that in above-mentioned rear projection screen provided in an embodiment of the present invention, light direction refers to projected-beam entrance
The direction being emitted into rear projection screen；The optical axis of the microlens layer 72 of Fresnel Lenses layer 71 and first and the 3rd lenticule 73
Answer keeping parallelism.The gap of pre-determined distance may be present between first microlens layer 72 and the second microlens layer 73.To ensure rear-projection
Within zone of reasonableness, the integral thickness of the first microlens layer 72 and the second microlens layer 73 may be provided at the integral thickness of screen
Within 200-800 μ ms.The thickness refers to through gap between a microlens layer 72, the second microlens layer 73 and two lens jackets
General thickness, when including two microlens layers due to rear projection screen, inevitably increase rear projection screen weight or body
Product, to make the integral thickness of rear projection screen, weight and volume be maintained within zone of reasonableness, preferably by two microlens layers
Integral thickness control at 200-800 μm.In manufacturing process, Reasonable adjustment above-mentioned two microlens layer can be needed according to light path
Thickness or the gap between it, and the distance between microlens layer 72 of Fresnel Lenses layer 71 and first so that rear projection screen
Integral thickness in more suitable scope, the weight and volume of rear projection screen is unlikely to excessive, and the embodiment of the present invention is not right
The specific Thickness of microlens layer is defined.
Example IV
Based on same inventive concept, the embodiment of the present invention provides a kind of optical projection system, and the optical projection system includes any of the above-described
Rear projection screen.The optical projection system can be rear-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 rear projection screen is matched to show.Using the embodiment of the present invention
When the optical projection system of offer carries out image display, dimensional energy distribution difference of the white light after rear projection screen can be effectively reduced,
Its white light colour cast is relatively low, and lifting shows the uniformity of color.
Rear projection screen provided in an embodiment of the present invention and optical projection system, including：The Fresnel set gradually along light direction
Lens jacket and microlens layer；Microlens layer includes：Multiple lenticule groups in array distribution；Lenticule group includes：Along light extraction side
To the first lenticule and the second lenticule set gradually, the first lenticule is used to enter guild to each primary lights in incident ray
Poly-, the second lenticule is used to dissipate each primary lights, to reduce the inclined of each primary lights after the convergence of the first lenticule
Roll over difference.The difference of light refractive index in lens of different wave length, causes to pass through in white light due to projecting rear projection screen
The refractive direction of the primary colours light of the different wave length of lens occurs difference and produces colour cast.It is provided in an embodiment of the present invention above-mentioned micro-
In each lenticule group in mirror layer, meeting is produced to each primary lights when each primary lights in white light incident ray pass through the first lenticule
Poly- effect, each primary lights are made to incide the second lenticule after different degrees of deviation occurs, because the second lenticule is with smaller
Abbe number, therefore relative to the first lenticule can to incidence convergence after each primary colours light greatly dissipated
Effect, the deviation difference of each primary lights as caused by the first lenticule is reduced, so as to be produced to white light in the first lenticule
Each primary colours light deflection difference compensate, essentially coincide each primary lights of the different wave length of outgoing, make each primary colours in white light
The deviation angle of light is basically identical, causes dimensional energy distribution to become due to deviation difference so as to reduce each primary lights in white light
Change, thus, each primary lights proportion in white light keeps constant, and colour temperature difference can't occur with the increase at visual angle,
Also colour cast of the white light under different visual angles will not be caused, lifting shows the uniformity of color.
And when rear projection screen includes two microlens layers, i.e., when the first above-mentioned microlens layer and the second microlens layer,
For white light after the converging action of the first lenticule, the deviation degree of each primary lights produces different；In each primary lights again
After the disperse function of the second lenticule, compared due to the second lenticule has less abbe number to the first lenticule,
Therefore, the second lenticule can carry out more great Cheng to each primary lights with certain deviation difference after the convergence of the first lenticule
The disperse function of degree, so that there is deviation difference during each primary lights outgoing of deviation difference to reduce originally, when making outgoing
Each primary lights essentially coincide, so as to reach the depolarized color effect to white light entrance lens.And in each primary lights essentially coincided again
When inciding in the 3rd lenticule, because the 3rd lenticule is as the second lenticule, there is smaller abbe number, therefore, can
Largely disperse function is carried out to inciding each primary lights in the 3rd lenticule, so that each primary lights essentially coincided
Largely separating again, last each primary lights, which are incided in the 4th larger lenticule of abbe number, enters line convergence, by
In the process by the 3rd lenticule and the 4th lenticule it is opposite by the first lenticule and the second lenticule in each primary lights
Process, therefore, essentially coincide or each primary lights with lesser degree deviation difference of speech be by the 3rd lenticule and the
After four lenticules, can further it coincide together, so that each primary lights being finally emitted by the 4th lenticule are completely heavy
Close, thus, be consistent the deviation angle of each primary lights in white light, so as to eliminate in white light each primary lights due to deviation difference
And causing dimensional energy distribution to change, each primary lights proportion in white light keeps constant, can't be with the increase at visual angle
And colour temperature difference occurs, it will not also cause colour cast of the white light under different visual angles, further lifting shows the uniformity of 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 (10)
- A kind of 1. rear projection screen, it is characterised in that including：The Fresnel Lenses layer and lenticule set gradually along light direction Layer；The microlens layer includes：Multiple lenticule groups in array distribution；The lenticule group includes：The first lenticule and the second lenticule set gradually along light direction；Described first is micro- The abbe number of mirror is more than the abbe number of second lenticule；First lenticule is used to enter line convergence to each primary lights in incident ray；Second lenticule is used for each institute State primary lights to be dissipated, to reduce the deviation difference of each primary lights after first lenticule convergence；The incident ray is incident to human eye after the microlens layer.
- 2. rear projection screen as claimed in claim 1, it is characterised in that the abbe number of first lenticule is 40-80；Institute The abbe number for stating the second lenticule is 10-40.
- 3. rear projection screen as claimed in claim 1, it is characterised in that first lenticule and second lenticule are close Fitting.
- 4. rear projection screen as claimed in claim 1, it is characterised in that between first lenticule and second lenticule The gap of pre-determined distance be present.
- 5. the rear projection screen as described in claim any one of 1-4, it is characterised in that first lenticule and described second micro- The material of lens is optics plastic cement or optical glass.
- A kind of 6. rear projection screen, it is characterised in that including：It is the Fresnel Lenses layer that is set gradually along light direction, first micro- Mirror layer and the second microlens layer；First microlens layer includes：Multiple the first lenticule groups in array distribution；The first lenticule group includes：The first lenticule and the second lenticule set gradually along light direction；Described first The abbe number of lenticule is more than the abbe number of second lenticule；Second microlens layer includes：Multiple the second lenticule groups in array distribution；The second lenticule group includes：The 3rd lenticule and the 4th lenticule set gradually along light direction；Described 3rd The abbe number of lenticule is less than the abbe number of the 4th lenticule；First lenticule is used to enter line convergence to each primary lights in incident ray；Second lenticule is used for each institute State primary lights to be dissipated, to reduce the deviation difference of each primary lights after first lenticule convergence；3rd lenticule is used for being dissipated by each primary lights of second lenticule；4th lenticule is used It is poor to reduce the deviation of each primary lights after the 3rd lenticule diverging in entering line convergence to each primary lights It is different；The incident ray is incident to human eye after first microlens layer and second lenticule.
- 7. rear projection screen as claimed in claim 6, it is characterised in that the abbe number of first lenticule and the described 4th The abbe number of lenticule is equal；OrThe abbe number of first lenticule is less than the abbe number of the 4th lenticule.
- 8. rear projection screen as claimed in claim 6, it is characterised in that first microlens layer and second microlens layer Between there is prepsetting gap.
- 9. a kind of optical projection system, it is characterised in that including the rear projection screen as described in claim any one of 1-5.
- 10. a kind of optical projection system, it is characterised in that including the rear projection screen as described in claim any one of 6-8.
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| CN201610654119.XA CN107728420A (en) | 2016-08-11 | 2016-08-11 | A kind of rear projection screen and optical projection system |
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| CN201610654119.XA CN107728420A (en) | 2016-08-11 | 2016-08-11 | A kind of rear projection screen and optical projection system |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5876825A (en) * | 1981-10-30 | 1983-05-10 | Sony Corp | Transmittable video screen |
| JPH02304542A (en) * | 1989-05-19 | 1990-12-18 | Dainippon Printing Co Ltd | Transmission screen |
| CN1341870A (en) * | 2000-08-30 | 2002-03-27 | 松下电器产业株式会社 | Back projection type screen and back projection display |
| CN1743899A (en) * | 2004-09-03 | 2006-03-08 | Lg电子株式会社 | Projection display screen having microlens array |
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2016
- 2016-08-11 CN CN201610654119.XA patent/CN107728420A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5876825A (en) * | 1981-10-30 | 1983-05-10 | Sony Corp | Transmittable video screen |
| JPH02304542A (en) * | 1989-05-19 | 1990-12-18 | Dainippon Printing Co Ltd | Transmission screen |
| CN1341870A (en) * | 2000-08-30 | 2002-03-27 | 松下电器产业株式会社 | Back projection type screen and back projection display |
| CN1743899A (en) * | 2004-09-03 | 2006-03-08 | Lg电子株式会社 | Projection display screen having microlens array |
Non-Patent Citations (1)
| Title |
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| 拉尔夫·伊·雅格布逊 等: "《大不列颠摄影教程》", 31 March 2002 * |
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