CN106842799A - 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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- CN106842799A CN106842799A CN201611221178.4A CN201611221178A CN106842799A CN 106842799 A CN106842799 A CN 106842799A CN 201611221178 A CN201611221178 A CN 201611221178A CN 106842799 A CN106842799 A CN 106842799A
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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
- G03B21/602—Lenticular screens
Abstract
The invention discloses a kind of rear projection screen, including：The Fresnel Lenses layer set gradually along projection lens light direction, microlens layer and convergent lens layer, wherein microlens layer includes multiple the first lenticules in array distribution, first lenticule is positive lens, and the refractive index of the first lenticule is more than the refractive index of the convergent lens unit of convergent lens layer, process of the light beam by convergent lens layer post-concentration can be slowed down, make the degree reduction that each primary lights light beam dissipates again after assembling in light beam, reduce deviation difference of each primary lights light beam in communication process, improve the registration of each primary lights light beam, so as to reduce white light by the dimensional energy distribution change after above-mentioned rear projection screen, color offset phenomenon has been mitigated or eliminated, improve the uniformity of display picture color.The invention also discloses a kind of optical projection system of the above-mentioned projection screen of application.
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 display field, generally using the projection with micro fresnel lenses structure
Screen, as depicted in figs. 1 and 2, along projection lens light direction, sequentially passes through Fresnel lens structure layer 11 and convergent lens knot
Structure layer 12.The focal length of projector and rear projection screen are matched when in use, can on rear projection screen display picture.Specific index path
As shown in Fig. 2 the light that Fresnel lens structure layer 11 will be incident to screen enters line convergence collimation, in convergent lens structure sheaf 12
Convex lens portions tap receive collimated ray and go forward side by side line convergence, it is theoretical being imaged on the focal plane of convex lens, and it is final from
Convergent lens structure sheaf 12 with after convergence dissipate state be transmitted, and due to white light beam in each primary colours optical wavelength not
Together, the degree being refracted there is also difference, so that the divergent state of each primary lights is also inconsistent.
In actual applications, according to the test result to white field after rear projection screen, technical staff has found, as shown in fig. 6, in screen
Central point, i.e. horizontal view angle are that the colour cast at 0 is 0, and with the increase of horizontal view angle, the colour cast of generation can also increase therewith,
And, with the increase of vertical angle of view, the colour cast of generation can also increase therewith, i.e., as visual angle increases, produce different degrees of
Colour cast, the direct vision performance of colour cast is exactly that white field is no longer default color temperature value, and is shown with certain primary colours color partially, from
And human eye to there is image frame color in different visual angles or diverse location viewing display picture inconsistent, especially for large-size screen monitors
In tiled display, more scene, the PPT displayings of such as large conference room, different visual angles or diverse location are used for white field
Colour cast can substantially reduce the experience of user.
Therefore, how to effectively reduce the colour cast that rear projection screen produces in display picture turns into problem demanding prompt solution.
The content of the invention
The embodiment of the present invention provides a kind of rear projection screen and optical projection system, not when being used to reduce rear projection screen display picture
With the color offset phenomenon under visual angle.
In a first aspect, the embodiment of the present invention provides a kind of rear projection screen, including：Set gradually along projection lens light direction
Fresnel Lenses layer, convergent lens layer, and positioned at Fresnel Lenses layer and convergent lens layer between microlens layer；
Microlens layer includes：Multiple is in the first lenticule of array distribution；
First lenticule be positive lens, and the first lenticule refractive index more than convergent lens layer convergent lens unit folding
Penetrate rate；
Further, the first lenticule is biconvex lens structure or planoconvex spotlight structure；
Further, microlens layer is brought into close contact or both the gap that there is predeterminable range with lens jacket is assembled；
Further, convergent lens layer is lens pillar layer；
Further, convergent lens layer is soot layer；
Further, along projection lens light direction, projection screen also includes being set in turn in the ring of soot layer light emission side
Border light absorbing zone, substrate protective layer；
Further, the first lenticule material is optics plastic cement or optical glass；
Further, multiple the first lenticules in array distribution are integrally formed；
Further, the thickness of microlens layer is at 100 ~ 300 μm.
Second aspect, the embodiment of the present invention provides a kind of optical projection system, including laser projection device main frame, also including above-mentioned
Rear projection screen in any technical scheme.
Above example of the present invention at least has the advantages that：
Rear projection screen provided in an embodiment of the present invention, including：The Fresnel Lenses layer that sets gradually along projection lens light direction,
Convergent lens layer, and the microlens layer between Fresnel Lenses layer and convergent lens layer, microlens layer have positive lens
Characteristic, and refractive index is more than convergent lens layer.
So as to, it is parallel after Fresnel Lenses layer collimation to be incident to convergent lens layer compared in the prior art, and understood
The light beam process dissipated again after poly-, in this programme, by the light beam after Fresnel Lenses layer collimation first via the convergence of microlens layer,
Convergent lens layer is incident to the state for dissipating after convergence, then second convergence is carried out by convergent lens layer, and by convergent lens
Layer assemble process be slower than convergence process of the microlens layer to light beam so that each primary lights are gradually assembled in light beam, near or
Light beam is combined into when reaching screen exit face, light beam in the prior art is alleviated and is only realized assembling too early by convergent lens layer,
And caused by screen light emission side is presented stronger divergent state color offset phenomenon, this programme is by slowing down light beam by convergent lens layer
The process of post-concentration, makes the degree that each primary lights light beam dissipates again after assembling in light beam compared to directly from convergent lens layer outgoing
Degree of divergence reduced, so as to reduce deviation difference of each primary lights light beam in communication process, improve each base
The registration of coloured light light beam, reduces white light by the dimensional energy distribution change after above-mentioned rear projection screen, makes user in difference
Under visual angle, the colour cast degree of the image frame watched weakens or eliminates, and improves the uniformity of display picture color.
Brief description of the drawings
Fig. 1 is a kind of structure of rear projection screen and paths schematic diagram in the prior art；
Fig. 2 is the structure of another rear projection screen and paths schematic diagram in the prior art；
Fig. 3 is a kind of structure and paths schematic diagram of rear projection screen in the embodiment of the present invention；
Fig. 4 is the another structure and paths schematic diagram of rear projection screen in the embodiment of the present invention；
Fig. 5 is the structural representation of optical projection system in the embodiment of the present invention；
Fig. 6 is the colour cast change diagram measured in prior art rear projection screen；
Fig. 7 is that the change of three primary colours colour cast is illustrated in the prior art.
Specific embodiment
The embodiment of the present invention provides a kind of rear projection screen and projection arrangement, is used to reduce rear projection screen and is produced 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, below in conjunction with accompanying drawing the present invention is made into
One step ground is described in detail, it is clear that described embodiment is only a part of embodiment of the 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 discussed in detail below in conjunction with the accompanying drawings and using the rear projection screen
Optical projection system.
Embodiment one,
Rear projection screen structural representation as shown in Figure 3, the rear projection screen that the embodiment of the present invention one is provided, including：Along projection lens
Fresnel Lenses layer 31, convergent lens layer 32 that head light direction sets gradually and positioned at Fresnel Lenses layer 31 and assemble saturating
Microlens layer 33 between mirror layer 32.Wherein, microlens layer 33 includes：Multiple is in the first lenticule 331 of array distribution.Specifically
Ground, the first lenticule 331 is positive lens, and the first lenticule 331 convergent lens list of the refractive index more than convergent lens layer 32
The refractive index of unit.The Fresnel Lenses layer 31, microlens layer 33 of the emergent ray of the projection lens incident rear projection screen successively, with
And convergent lens layer 32, and finally enter human eye after screen surface outgoing, form image.
Preferably, the first lenticule is set up in parallel with lens unit is assembled, and size is suitable.
In the prior art, as shown in fig. 6, when different projection light source projects to projection screen colour cast with visual angle change color
Inclined degree is different.
It was discovered by researchers that this is due to the different base colors light in white light（Feux rouges R, green glow G, blue light B）Wavelength it is different,
Refractive index when by the convergent lens in rear projection screen is different and then causes white light by the dimensional energy distribution after screen
There occurs change.Fig. 7 is for white light W by each primary lights after the Fresnel Lenses layer and convergent lens layer of rear projection screen 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, by after screen
Dimensional energy distribution it is broader, and wavelength feux rouges R most long because refractive index minimum by the dimensional energy after screen
Distribution angle is smaller.Therefore, as visual angle increases, ratios of the blue light B in white light gradually increases, and causes colour temperature more and more higher,
White field there occurs the colour cast to high color temperature direction, be exactly partially blue image in visual performance.
In rear projection screen provided in an embodiment of the present invention, using the lenticule group of array distribution, by projector to
As shown in figure 3, wherein, W is represented by the white light of projector's outgoing, R, G, B represent white respectively for white light index path in lenticule group
Feux rouges with different wave length, green glow and blue light three primary colours light in light.Illustrated according to index path, the base of different wave length in white light W
Coloured light refractive index in lens has differences, therefore, feux rouges R, green glow G and blue light B with different wave length are saturating through overconvergence
The focal length dissipated after mirror layer is also different, wherein, the wavelength of blue light B is most short, the degree of its deviation during by convergent lens layer
Maximum, therefore its focal length is most short；And the wavelength of feux rouges R is most long, the degree of its deviation is minimum, and its focal length is maximum, this resulted in from
Burnt phenomenon deviation difference in other words, the beam focus of each wavelength can not be completely superposed, cause with the different color offset phenomenon in visual angle.
Structure as shown in Figure 3 and paths schematic diagram, in embodiment of the present invention scheme, Fresnel Lenses layer 31 will
The white light that projector sends（W）After collimation, light is set to incide the preceding surface of microlens layer 33 first, microlens layer 33 has just
Lens peculiarity, can play converging action to light.Simultaneously because microlens layer 33 is different to the refractive index of different wavelengths of light, cause
White light（W）It is divided into R, G, B three-beam, due to blue light（B）Wavelength it is most short, its refractive index in microlens layer 33 is maximum, because
And have the deviation of greater angle relative to incident collimated light beam, and it is successively blue light B according to deviation degree size specifically, it is green
Light G, feux rouges R.The refractive index of microlens layer 33 is bigger simultaneously, specifically, more than the refractive index of convergent lens layer 32 so that occur
R, G, B three primary colours light of deviation converge at the inside of microlens layer 33 earlier, afterwards again in the form of dissipating from lenticule
The rear surface outgoing of layer 33.After three primary colours light beam incides convergent lens layer 32, convergent lens 32 pairs of each primary color light bundles of layer are same
Sample plays a part of to assemble, but relative to parallel beam incident in Fig. 1 to the convergent lens 32 pairs of aggregation procedure of light of layer, this hair
In bright embodiment, the light of incident convergent lens layer 32 is diverging, then in allowing for relative to Fig. 1, each primary colours light is not
Can earlier assemble, i.e., will not too early converge at the inside of convergent lens layer 32.Namely by setting up microlens layer 33, alleviate
Light beam is only realized assembling too early by convergent lens layer in the prior art, and stronger divergent state is presented in screen light emission side causes
Color offset phenomenon.
Embodiment of the present invention scheme makes each primary colours in light beam by slowing down process of the light beam by convergent lens layer post-concentration
The degree that light light beam dissipates again after assembling is reduced compared to the degree of divergence directly from convergent lens layer outgoing, so may be used
To mitigate the otherness of the colour cast degree observed in different visual angles.
Also, when convergent lens 32 surface of layer is incided from the light of the outgoing of microlens layer 33,32 pairs, convergent lens layer
The refractive index of blue light B light is still more than the refractive index for green glow G and feux rouges R, although so blue light B light incidence convergent lens
Dispersion angle during layer 32 is maximum, but because blue light B light has bigger refractive index relative to green glow G and feux rouges R in lens
And make its accelerate assemble, although and green glow G and feux rouges R convergent lens layer 32 in refractive index it is small, due to incidence assemble
Dispersion angle is relatively small during lens jacket 32, that is, the degree that the big blue light of dispersion angle is assembled by deviation is more than dispersion angle
The degree that relatively small green glow and feux rouges is assembled by deviation so that final three primary colours light can reach coincidence status.Due to three
Shu Guang is to overlap in human eye viewing space, thus is not resulted in the colour cast at visual angle.
Specifically, three primary colours can be realized by the collocation of microlens layer 33 and convergent lens 32 focal length of layer and refractive index
Light is realizing converging at some coincidence near screen or screen exiting surface, realizes the degree of divergence from screen exit light beam,
The deviation difference of each primary lights is also reduced, beneficial to reduction colour cast.Preferably, in embodiments of the present invention, three primary colours light is final
Realize converging at a bit in screen exiting surface.
From principle, achromatism or colour cast（Reduce the different degree of divergence of each primary lights）Effect and above-mentioned lenticule
First lenticule of layer（Positive lens）It is bent with the refractive index of the convergent lens unit of convergent lens layer, focal length, abbe number, sphere
Rate radius has relation, and achromatism or colour cast basic ideas exactly show aberration with parameters, then according to aberration
Parameters are solved for 0.Achromatism formula can be simply expressed as follows：
It is 0 to make the aberration after two lens combinations, formula should be met：
A1/B1+A2/B2=0；--- formula（1）
Wherein A1 is the focal power of lens 1, and A2 is the focal power of lens 2, and B1, B2 are respectively two abbe numbers of lens.
In this example, the first lenticule and convergent lens unit are respectively lens 1, lens 2.
And focal power can approximate representation be：A=1/f=(n-1) (1/r1-1/r2), wherein f are focal lengths, and n is refractive index, right
In two lens respectively from the point of view of be two formula：
A1=（n1-1）(1/r1-1/r2)
A2=(n2-1)(1/r3-1/r4)
Wherein n1, n2 are respectively two refractive indexes of lens, and r1, r2 are two radius of curvature in face of lens 1, and r3, r4 are
Two radius of curvature in face of mirror 2.
Thus there is formula：（n1-1）(1/r1-1/r2)/ B1+(n2-1)(1/r3-1/r4)/ B2=0
Relational expression between each parameter that above-mentioned formula represents achromatism and produces.
And, the focal length of lens is related with refractive index in theory, and specific formula is：f=1/((n-1)(1/r1-1/
R2)) --- formula（2）, wherein f is focal length, and n is refractive index, and r1, r2 are two spherical radius, it can be seen that determined in r1, r2
On the premise of, f is inversely proportional with n, and refractive index is bigger, and focal length can be smaller, so that convergence of rays is obtained earlier.
It is applied in this programme embodiment, the first lenticule is positive lens, but refractive index is big, according to formula（2）, also
It is that the first lenticule focal length is very short, assembles quickly, and from the light of the first lenticule outgoing is presented after being assembled inside it
The light of divergent state, for the convergent lens unit being arranged on rear side of the first lenticule, its receive in divergent shape
The light of state, from the angle of convergent lens unit, focal length is considered as in other words can be regarded as a negative lens, i.e. its focal power
Negative value, and convergent lens unit is positive lens, its focal power or focal length are on the occasion of and the abbe number of two lens is just
Value.According to formula（1）, a lens strength is for just, a lens strength is negative, then the cooperation for passing through other specification, can
To realize aberration as 0, that is, reach the purpose for eliminating colour cast.
It is, by embodiment of the present invention scheme, can either mitigate each primary lights from screen exit when degree of divergence,
Further, deviation difference of each primary lights light beam in communication process can be reduced, the registration of each primary lights light beam is improved,
White light is reduced by the dimensional energy distribution change after above-mentioned rear projection screen, makes user under different visual angles, the figure watched
As the colour cast degree of picture weakens or eliminates, the uniformity of display picture color is improve.
In embodiments of the present invention, convergent lens layer 32 is specially soot layer, and soot layer 32 has multiple glass
Glass microballon unit, each glass microballoon unit equivalent to a convex lens, with positive lens characteristic.In being embodied one, edge
Projection lens light direction, also including being set in turn in the environment light absorbing zone 34 of soot layer light emission side.Wherein, ambient light
Absorbed layer 34 is used to absorb from screen front, the i.e. ambient light of user's side, prevents interference of the ambient light to image strip,
But the image strip to camera lens outgoing is transmitted, the contrast of projected image is improved.And, further, can also include
Substrate protective layer 35, can be Hard film structure, the outermost of projection screen is covered in, for being environment light absorbing zone 34 and glass
Glass microbead layer 32 provides support, and plays certain protective effect, and the image strip to camera lens outgoing is also carried out transmission.
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, by the beam treatment of said process so that degree of divergence drop when being incident to the beam exit of projection screen
Low or elimination, so that 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 being embodied one, the material of each first lenticule of microlens layer 32 can be optics plastic cement or optics glass
Glass.In manufacturing process, all of first lenticule in microlens layer 32 can be integrally formed by mould；Or, can also divide
Each first lenticule is not made, then each first lenticule is carried out into glued composition microlens layer 32.In practical application, being letter
Changing the preferable first way of process complexity carries out the making of microlens layer 32.Additionally, using other preparation methods and material
Make above-mentioned microlens layer and reach the situation of respective action of the present invention, do not limit herein.
And, each first lenticule of microlens layer 32 can be biconvex lens structure or planoconvex spotlight structure.Specific
Using can be to be designed according to the shape of the convergent lens unit of convergent lens layer 32, can be in order to the poly- lens jacket 32 of participant
By optics glue bond, or assembled by structure member stitched together.
It should be noted that microlens layer 33 can be brought into close contact with convergence lens jacket 32, it is also possible to which both exist pre-
If the gap of distance, the gap can be the dielectric layer that refractive index is 1, such as air layer.For example, convergent lens layer 32 with it is micro-
Can be at a distance of 1-5mm between mirror layer 33.In actual applications, the gap between convergent lens layer 32 and microlens layer 33 can be using folding
The rate of penetrating is 1 transparent material filling；Or, also lens jacket 32 and microlens layer 33 can will be assembled by outer peripheral fixture and protected
Hold above-mentioned spacing to be fixed, now, air between the two serves as the transparent material that above-mentioned refractive index is 1.Convergent lens
Layer the distance between 32 and microlens layer 33 can be adjusted according to the making demand and imaging standards of rear projection screen, normal conditions
Under in practical application, can be adjusted flexibly, can not limit herein at a distance of 3-5mm between the two.
Further, in above-mentioned rear projection screen provided in an embodiment of the present invention, the thickness of Fresnel Lenses layer 31 can be
50-200μm.In practical application, Fresnel Lenses layer 31 can be, by the thin slice of the material injection pressure such as polyolefin, to make
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 31, the embodiment of the present invention is not defined to its specific Thickness.
At the same time, it is unlikely to excessive to ensure the integral thickness of rear projection screen, the thickness of microlens layer can be 100-300
μm。
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 of outgoing is carried out after into rear projection screen by each optical structure layers；Fresnel Lenses layer, convergent lens layer and it is micro-
The optical axis of mirror layer answers keeping parallelism, each microlens structure being set up in parallel preferably.
Embodiment two,
As described in Figure 4, another rear projection screen that the embodiment of the present invention two is provided, and unlike embodiment one, in this example
Convergent lens layer is specially lens pillar layer.
Specifically, as shown in figure 4, rear projection screen includes：Along the Fresnel Lenses that projection lens light direction sets gradually
Layer 41, lens pillar layer 42, and the microlens layer 43 between Fresnel Lenses layer 41 and lens pillar layer 42.By projecting
The white light beam propagation path of camera lens outgoing is as follows：
The white light that Fresnel Lenses layer 41 sends projector（W）After collimation, before light is incided microlens layer 43 first
Surface, microlens layer 43 has positive lens characteristic, can play converging action to light.Simultaneously because the different ripples of microlens layer 43 pairs
The refractive index of light long is different, causes white light（W）It is divided into R, G, B three-beam, due to blue light（B）Wavelength it is most short, it is in lenticule
Refractive index in layer 43 is maximum, thus has the deviation of greater angle relative to incident collimated light beam, specifically, according to deviation journey
Degree size is successively blue light B, green glow G, feux rouges R.The refractive index of microlens layer 43 is bigger simultaneously, specifically, more than lens pillar
The refractive index of layer 42 so that R, G, B three primary colours light that deviation occurs converge at the inside of microlens layer 43, Zhi Houzai earlier
From the rear surface outgoing of microlens layer 43 in the form of dissipating.After three primary colours light beam incides lens pillar layer 42, column is saturating
42 pairs of each primary color light bundles of mirror layer equally play convergence, but relative to parallel beam incident in Fig. 1 to lens pillar layer 42
To the aggregation procedure of light, in the embodiment of the present invention, the light of incident lens pillar layer 42 is diverging, then allowed for relative
In Fig. 1, each primary colours light will not be assembled earlier, i.e., will not too early converge at the inside of lens pillar layer 42.Namely pass through
Microlens layer 43 is set up, light beam in the prior art is alleviated and is only realized assembling too early by lens pillar layer, and in screen light extraction
Side is presented color offset phenomenon caused by stronger divergent state.
Embodiment of the present invention scheme makes each primary colours in light beam by slowing down process of the light beam by lens pillar layer post-concentration
The degree that light light beam dissipates again after assembling is reduced compared to the degree of divergence directly from lens pillar layer outgoing, so may be used
To mitigate the otherness of the colour cast degree observed in different visual angles.
Also, when lens pillar 42 surface of layer is incided from the light of the outgoing of microlens layer 43,42 pairs, lens pillar layer
The refractive index of blue light B light is still more than the refractive index for green glow G and feux rouges R, although so blue light B light incidence lens pillar
Dispersion angle during layer 42 is maximum, but because blue light B light has bigger refractive index relative to green glow G and feux rouges R in lens
And make its accelerate assemble, although and green glow G and feux rouges R lens pillar layer 42 in refractive index it is small, due in incident column
Dispersion angle is relatively small during lens jacket 42, that is, the degree that the big blue light of dispersion angle is assembled by deviation is more than dispersion angle
The degree that relatively small green glow and feux rouges is assembled by deviation so that final three primary colours light can reach coincidence status.Due to three
Shu Guang is to overlap in human eye viewing space, thus is not resulted in the colour cast at visual angle.
Specifically, embodiment in similar embodiment one, can by microlens layer 43 and lens pillar layer 42 focal length and
The collocation of refractive index, realizes that three primary colours light is realizing converging at some coincidence near screen or screen exiting surface.
It is, by embodiment of the present invention scheme, can either mitigate each primary lights from screen exit when degree of divergence,
Further, deviation difference of each primary lights light beam in communication process can be reduced, the registration of each primary lights light beam is improved,
White light is reduced by the dimensional energy distribution change after above-mentioned rear projection screen, makes user under different visual angles, the figure watched
As the colour cast degree of picture weakens or eliminates, the uniformity of display picture color is improve.
And, the present embodiment from embodiment one difference be convergent lens layer specific constructive form it is different, in this reality
Apply in example, convergent lens layer is specially lens pillar layer, and for the setting of microlens layer, including material, lens face type is designed,
Lens jacket thickness, processing and fabricating etc. can be found in described in embodiment one, will not be repeated here.
Embodiment three,
Based on same inventive concept, the embodiment of the present invention provides a kind of optical projection system, and the optical projection system includes above-described embodiment
Rear projection screen.The optical projection system can be rear-projection display system, in actual applications, by the focal length of projector and Jiao of rear projection screen
Image can be carried out after matching to show.
And, the optical projection system that the present embodiment is provided can be shown with single screen rear-projection display system, or multi-screen rear-projection
System.
Specifically, can be so that as shown in figure 5, the optical projection system includes projector 50, rear projection screen 51, projector 50 can have
Body is laser projection device, or ultrashort burnt laser projection device, and the mixed light white light beam that it sends is incident to rear projection screen 51,
Rear projection screen 51 carries out image as a result of the projection screen in above-described embodiment one or two, embodiment of the present invention optical projection system
During display, by slowing down process of each primary lights light beam by convergent lens layer post-concentration, make each primary lights light beam meeting in light beam
The degree dissipated again after poly- is reduced compared to the degree of divergence directly from convergent lens layer outgoing, so as to reduce each base
Deviation difference of the coloured light light beam in communication process, improves the registration of each primary lights light beam, reduces white light by above-mentioned
Dimensional energy distribution change after rear projection screen, makes user under different visual angles, and the colour cast degree of the image frame watched subtracts
Weak or elimination, improves the uniformity of display picture color.
Obviously, those skilled in the art can carry out various changes and modification without deviating from essence of the invention to the present invention
God and scope.So, if these modifications of the invention and modification 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 these changes and modification.
Claims (10)
1. a kind of rear projection screen, at least includes：Fresnel Lenses layer, the convergent lens set gradually along projection lens light direction
Layer, it is characterised in that also including the microlens layer between Fresnel Lenses layer and convergent lens layer；
The microlens layer includes：Multiple is in the first lenticule of array distribution；
First lenticule be positive lens, and first lenticule refractive index more than the convergent lens layer convergence
The refractive index of lens unit.
2. rear projection screen as claimed in claim 1, it is characterised in that first lenticule is biconvex lens structure or plano-convex
Lens arrangement.
3. rear projection screen as claimed in claim 1, it is characterised in that the tight patch of the microlens layer and convergent lens layer
There is the gap of predeterminable range in conjunction or both.
4. rear projection screen as claimed in claim 1, it is characterised in that the convergent lens layer is lens pillar layer.
5. rear projection screen as claimed in claim 1, it is characterised in that the convergent lens layer is soot layer.
6. rear projection screen as claimed in claim 5, it is characterised in that along projection lens light direction, the projection screen is also
Environment light absorbing zone including being set in turn in the soot layer light emission side, substrate protective layer.
7. rear projection screen as claimed in claim 1, it is characterised in that the first lenticule material is optics plastic cement or optics
Glass.
8. rear projection screen as claimed in claim 1, it is characterised in that the multiple the first lenticule in array distribution is integrally
Shaping.
9. the rear projection screen as described in claim 1 or 8, it is characterised in that the thickness of the microlens layer is at 100 ~ 300 μm.
10. a kind of optical projection system, including laser projection device main body, it is characterised in that also including such as any one of claim 1-9
Described rear projection screen.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611221178.4A CN106842799A (en) | 2016-12-27 | 2016-12-27 | A kind of rear projection screen and optical projection system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611221178.4A CN106842799A (en) | 2016-12-27 | 2016-12-27 | A kind of rear projection screen and optical projection system |
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| Publication Number | Publication Date |
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| CN106842799A true CN106842799A (en) | 2017-06-13 |
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|---|---|---|---|
| CN201611221178.4A Pending CN106842799A (en) | 2016-12-27 | 2016-12-27 | A kind of rear projection screen and optical projection system |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5990835A (en) * | 1982-11-16 | 1984-05-25 | Asahi Glass Co Ltd | Transmission screen |
| US6239907B1 (en) * | 1999-09-03 | 2001-05-29 | 3M Innovative Properties Company | Rear projection screen using birefringent optical film for asymmetric light scattering |
| CN1488992A (en) * | 2002-08-30 | 2004-04-14 | ������������ʽ���� | Transmission-type screen and rear-projection projector |
| CN201876559U (en) * | 2010-11-30 | 2011-06-22 | 杭州中科新松光电有限公司 | Curved pyramid-shaped microlens array and rear projection screen with same |
| CN106019796A (en) * | 2016-08-10 | 2016-10-12 | 海信集团有限公司 | Projection screen, large-size spliced screen and projection system |
| CN106019795A (en) * | 2016-08-10 | 2016-10-12 | 海信集团有限公司 | Rear projection screen and projection system |
-
2016
- 2016-12-27 CN CN201611221178.4A patent/CN106842799A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5990835A (en) * | 1982-11-16 | 1984-05-25 | Asahi Glass Co Ltd | Transmission screen |
| US6239907B1 (en) * | 1999-09-03 | 2001-05-29 | 3M Innovative Properties Company | Rear projection screen using birefringent optical film for asymmetric light scattering |
| CN1488992A (en) * | 2002-08-30 | 2004-04-14 | ������������ʽ���� | Transmission-type screen and rear-projection projector |
| CN201876559U (en) * | 2010-11-30 | 2011-06-22 | 杭州中科新松光电有限公司 | Curved pyramid-shaped microlens array and rear projection screen with same |
| CN106019796A (en) * | 2016-08-10 | 2016-10-12 | 海信集团有限公司 | Projection screen, large-size spliced screen and projection system |
| CN106019795A (en) * | 2016-08-10 | 2016-10-12 | 海信集团有限公司 | Rear projection screen and projection system |
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