CN109725484A - A kind of off-axis short focus orthographic projection optical screen and projection display system - Google Patents
A kind of off-axis short focus orthographic projection optical screen and projection display system Download PDFInfo
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- CN109725484A CN109725484A CN201910017661.8A CN201910017661A CN109725484A CN 109725484 A CN109725484 A CN 109725484A CN 201910017661 A CN201910017661 A CN 201910017661A CN 109725484 A CN109725484 A CN 109725484A
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Abstract
The invention discloses a kind of off-axis short focus orthographic projection optical screen and projection display system, optical screen successively includes the first reflecting layer (1), functional layer (2), Fresnel Lenses layer (3), the second reflecting layer (4), protective layer (5) and bearing plate layer (6)；First reflecting layer (1) is mirror surface antireflecting layer；The functional layer (2) includes cylindrical lenses layer (21), coloring layer (22) and the diffusion layer (23) that sequence can be converted arbitrarily.Display system includes above-mentioned optical screen, and the off-axis short focus projector (9) positioned at optical screen side.There is the present invention high-gain, wide horizontal view angle, image high-definition to show, breaches defect of the image without the depth of field that conventional projection is shown, obtains the high depth image display effect for the liquid crystal display that can match in excellence or beauty completely.
Description
Technical field
The invention belongs to projection display technique field, in particular to a kind of off-axis short focus orthographic projection optical screen and projection are aobvious
Show system.
Background technique
In recent years, with the raising of projector light emission luminance itself, most of projection screens are needed in natural light or non-
Often used in bright environment.The problem of due to technical principle, carrys out perspective view using general glass bead screen, white plastic curtain, grey curtain etc.
When picture, the black pattern in the stronger projected image of environment light is brighter therewith, the contrast degradation of projected image, image color
It is thin out because being superimposed environment light, cause color reducibility very unsatisfactory, image shows also very unintelligible, lacks stereoscopic depth
Visual experience.
Projection screen, especially forward projection's screen are thus used under bright light environments, solve the color of projected image also
The true reappearance ability of originality energy and the depth of field, especially black pattern, it appears particularly important.Thus need one kind can really again
Existing black image, there is forward projection's screen of high contrast, Gao Jingshen under bright light environments.
In existing forward projection's screen, U.S. patent Nos US6023369 uses basal layer 11 and reflective surface layer
12 structures combined, as shown in Figure 1, the image light of 12 reflective projector 20 of reflective surface layer is utilized, and with basal layer
The image light E of reflection in horizontal, vertical direction scatter distributions, is increased image aspects and brightness uniformity by outer surface 14.
Simultaneously using the basal layer 11 for having stronger absorption to luminous ray, incidence angle ambient light A small to top absorbs, from
And improve the contrast of projected image.However the ambient light R1 of the level of approximation of the directive screen upper area and by this
The light R2 come is penetrated in the bigger incident angular direction of side direction on screen, is emitted after the screen reflection, eventually enters into observer 30
Eyes, so as to cause the decline of projected image contrast, thus can not reach higher and display contrast.
Summary of the invention
It is an object of the invention to overcome the deficiencies of the prior art and provide one kind to have high-gain, wide horizontal view angle, high definition
The image of clear degree is shown, can obtain the off-axis short focus orthographic projection light of the high depth image display effect for the liquid crystal display that can match in excellence or beauty
Learn screen, and the projection display system comprising the optical screen.
The purpose of the present invention is achieved through the following technical solutions: a kind of off-axis short focus orthographic projection optical screen, according to
Secondary includes the first reflecting layer, functional layer, Fresnel Lenses layer, the second reflecting layer, protective layer and bearing plate layer；
First reflecting layer is mirror surface antireflecting layer；The functional layer includes the coloring that sequence can be converted arbitrarily
Layer, cylindrical lenses layer and diffusion layer.
Further, the mirror surface antireflecting layer and functional layer are electroplated respectively or print or be sprayed on first base material
Tow sides, the refractive index of the mirror surface antireflecting layer are less than the refractive index of first base material.
Further, the cylindrical lenses layer is arranged by vertical array, the refractive index of cylindrical lenses layer be less than coloring layer and
The refractive index of diffusion layer.
Further, the Fresnel Lenses layer is coated on the second substrate；
The section of Fresnel Lenses layer is jagged trigone lens array, and each prism array structure is by two plane structures
At being directed towards projector's incident ray and the reflecting surface with the second substrate surface at angle α respectively, and enter away from projector
Penetrate light and the anti-light surface with horizontal plane at angle β；The angle α of Fresnel Lenses layer reflecting surface and substrate surface is along far from throwing
The direction of shadow machine remains unchanged or is gradually increased；The angle β of the anti-light surface of Fresnel Lenses layer and horizontal plane is equal to projector
The angle of incident ray and horizontal plane, and be gradually increased or angle β is remained unchanged along the direction far from projector, or
Person is the gradual variation in part or local burst mode variation.
Fresnel Lenses layer is arranged by circle ring array or linear array arrangement, the section indention of Fresnel Lenses layer
Shape；The angle α of Fresnel Lenses layer reflecting surface and substrate surface is remained unchanged or is gradually increased along the direction far from projector；It is luxuriant and rich with fragrance
The angle β of the anti-light surface of Nie Er lens jacket and horizontal plane is equal to the incident ray of projector and the angle of horizontal plane.
Further, the Fresnel Lenses layer reflecting surface uses the height for having high specular reflectivity to visible light anti-
Film is penetrated to be made, within the scope of visible light 380nm~780nm highest reflectivity be more than or equal to 90%, average reflectance be greater than etc.
In 80%, highly reflecting films with a thickness of 0.05 μm~1 μm；
The anti-light surface of Fresnel Lenses layer is made of black material, for absorbing environment spurious rays, improves screen pair
Degree of ratio；
The adjacent prism tooth tip spacing γ of Fresnel Lenses layer along far from projector direction remain unchanged or by
It is decrescence small, and the spacing meets L1/10≤γ≤L1/ 2, L1For projected image pixel wide.
Further, second substrate is closed using hard high molecular material and functional layer and Fresnel Lenses lamination with shape
At hard curtain, or using soft material and cylindrical lenses layer and functional layer pressing to form supporting part.
The present invention also provides a kind of off-axis short focus front projection display systems, including above-mentioned optical projection screen, and
Off-axis short focus projector positioned at optical screen side.
The beneficial effects of the present invention are: optical screen of the invention is under bright light environments, have high-gain, high contrast,
The advantages of high color reproduction degree.Optical screen and off-axis short focus projector of the invention forms projection display system, has high increase
Benefit, wide horizontal view angle, image high-definition are shown, are breached defect of the image without the depth of field that conventional projection is shown, are obtained
Can match in excellence or beauty the high depth image display effect of liquid crystal display completely.
Detailed description of the invention
Fig. 1 is forward projection's screen construction schematic diagram of the prior art of the invention；
Fig. 2 is off-axis short focus orthographic projection optical screen structural schematic diagram of the invention；
Fig. 3 is cylindrical lenses schematic diagram of a layer structure of the invention；
Fig. 4 is that Fresnel Lenses layer circle ring array of the invention arranges schematic diagram；
Fig. 5 is that Fresnel Lenses layer linear array of the invention arranges schematic diagram；
Fig. 6 is that Fresnel Lenses reflecting surface angle α of the invention changes schematic diagram；
Fig. 7 is the angle β variation schematic diagram of the anti-light surface of Fresnel Lenses layer of the invention and substrate surface；
Fig. 8 is Fresnel Lenses applying structure schematic diagram of the invention；
Fig. 9 is the adjacent prism tooth tip spacing schematic diagram of the present invention of the invention；
Figure 10 be oblique incidence ambient light of the invention on the screen move towards schematic diagram；
Figure 11 is that level of approximation incident ambient light of the invention moves towards schematic diagram on the screen；
Description of symbols: the first reflecting layer 1-, 2- functional layer, 21- cylindrical lenses layer, 22- coloring layer, 23- diffusion layer,
3- Fresnel Lenses layer, the second reflecting layer 4-, 5- protective layer, 6- bearing plate layer, 7- first base material, the second substrate of 8-, 9- are inclined
Axis short focus projector.
Specific embodiment
Technical solution of the present invention is further illustrated with reference to the accompanying drawing.
As shown in Fig. 2, a kind of off-axis short focus orthographic projection optical screen, successively includes the first reflecting layer 1, functional layer 2, Fei Nie
That lens jacket 3, the second reflecting layer 4, protective layer 5 and bearing plate layer 6；
First reflecting layer 1 is mirror surface antireflecting layer；The functional layer 2 includes the column that sequence can be converted arbitrarily
Lens jacket 21, coloring layer 22 and diffusion layer 23 (Fig. 2 shows only a kind of implementation, be followed successively by cylindrical lenses layer, coloring layer and
Diffusion layer).
Further, the mirror surface antireflecting layer and functional layer are electroplated respectively or print or be sprayed on first base material
Tow sides, the refractive index of the mirror surface antireflecting layer are less than the refractive index of first base material, can effectively increase injection
The light of inside screen promotes the utilization rate of projector's emergent light, obtains higher picture display brightness.
Further, the cylindrical lenses layer is arranged by vertical array, so that the orthographic projection optical screen is obtained higher
Viewing visual angle, as shown in Figure 3；The refractive index of cylindrical lenses layer is less than the refractive index of coloring layer and diffusion layer, low-refraction
Cylindrical lenses can converge the light for injecting inside screen, reduce light and reflect screen, improve the brightness of screen.
Further, the Fresnel Lenses layer is coated on the second substrate；
The section of Fresnel Lenses layer is jagged trigone lens array, and each prism array structure is by two plane structures
At being directed towards projector's incident ray and the reflecting surface with the second substrate surface at angle α respectively, and enter away from projector
Penetrate light and the anti-light surface with horizontal plane at angle β；The angle α of Fresnel Lenses layer reflecting surface and substrate surface is along far from throwing
The direction of shadow machine remains unchanged or is gradually increased, respectively as shown in Fig. 4 (a) and 4 (b)；The anti-light surface of Fresnel Lenses layer and water
The angle β of plane is equal to the incident ray of projector and the angle of horizontal plane；Angle β can be along the direction far from projector
It is gradually reduced, is also possible to angle β and remains unchanged, as shown in Fig. 5 (a)；Either part is gradual becomes smaller, or part
Segmented becomes smaller, as shown in Fig. 5 (b).
Fresnel Lenses layer is by circle ring array arrangement (as shown in Figure 6) or linear array arrangement (as shown in Figure 7), Fresnel
The section indention shape of lens jacket；The angle α of Fresnel Lenses layer reflecting surface and substrate surface is along the direction far from projector
It remains unchanged or is gradually increased；The angle β of the anti-light surface of Fresnel Lenses layer and substrate surface be equal to projector incident ray with
The angle of horizontal plane.The Fresnel Lenses layer 3 is either be coated on the second substrate 8, then the second substrate 8 and diffusion
Layer 23 is laminating, as shown in Fig. 8 (a)；It can also be coated on the second substrate 8, then the other side and diffusion layer 23 are laminating, such as Fig. 8
(b) shown in.
Further, the Fresnel Lenses layer reflecting surface uses the height for having high specular reflectivity to visible light anti-
It penetrates film to be made, can be made of silver, aluminium, gold, highly reflecting films, highest reflectivity is big within the scope of visible light 380nm~780nm
In be equal to 90%, average reflectance be more than or equal to 80%, highly reflecting films with a thickness of 0.05 μm~1 μm；
The anti-light surface of Fresnel Lenses layer is made of black material, for absorbing environment spurious rays, improves screen pair
Than degree, which can be smooth surface, is also possible to rough surface；
The adjacent prism tooth tip spacing γ of Fresnel Lenses layer along far from projector direction remain unchanged or by
It is decrescence small, and the spacing meets L1/10≤γ≤L1/ 2, L1For projected image pixel wide, as shown in Figure 9.
Further, second substrate uses hard high molecular material (such as PMMA, PC, PVC) and functional layer and phenanthrene
The pressing of Nie Er lens jacket is to form hard curtain, or uses soft material (such as TPU, EVA, PET, silicon rubber) and cylindrical lenses layer
It presses with functional layer to form supporting part.
The backplanes support layer of the orthographic projection optical screen can be aluminium-plastic panel, honeycomb aluminum plate, the PS hair of 1mm~20mm thickness
The composition such as plate, glass plate is steeped, backplanes support layer has very high-flatness and rigidity, guarantees that screen is indeformable after prolonged use
Or deflection is less than 5mm.
Protective layer in the orthographic projection optical screen structure, the scratch resistance material that can be electroplated or spray or be coated with can also
To be the soft protective films such as PET, the PVC pasted, effectively reflecting layer can be prevented to be scratched, influence reflecting effect.
The invention also discloses a kind of off-axis short focus front projection display system, including above-mentioned optical projection screen, Yi Jiwei
Off-axis short focus projector 9 in optical screen side.
Pusher side is projected by the orthographic projection optical screen and off-axis, one higher position of top incident ambient light obliquely,
Just directive has the anti-light surface of Fresnel Lenses layer, is more than or equal to 90% to the absorptivity of visible light, only seldom part quilt
The anti-light surface reflection of Fresnel Lenses layer, into point of observation side.To effectively raise under bright light environments, projected image
Contrast and color rendition degree.As shown in Figure 10.
Pusher side, the ambient light of one higher position level of approximation incidence of top are projected by the orthographic projection optical screen and off-axis
R3, R4, just directive Fresnel Lenses layer reflecting surface and the anti-light surface of Fresnel Lenses layer, are greater than the absorptivity of visible light
Equal to 90%, environment light R4 is almost completely absorbed.Only environment light R3 is reflected via Fresnel Lenses layer reflecting surface, and again
Secondary to absorb via diffusion layer and coloring layer, final few ambient light, which projects, enters point of observation side, to more preferably efficiently mention
It is high under bright light environments, the contrast and color rendition degree of projected image.As shown in figure 11.
Those of ordinary skill in the art will understand that the embodiments described herein, which is to help reader, understands this hair
Bright principle, it should be understood that protection scope of the present invention is not limited to such specific embodiments and embodiments.This field
Those of ordinary skill disclosed the technical disclosures can make according to the present invention and various not depart from the other each of essence of the invention
The specific variations and combinations of kind, these variations and combinations are still within the scope of the present invention.
Claims (7)
1. a kind of off-axis short focus orthographic projection optical screen, which is characterized in that successively include the first reflecting layer (1), functional layer (2),
Fresnel Lenses layer (3), the second reflecting layer (4), protective layer (5) and bearing plate layer (6)；
First reflecting layer (1) is mirror surface antireflecting layer；The functional layer (2) includes the column that sequence can be converted arbitrarily
Lens jacket (21), coloring layer (22) and diffusion layer (23).
2. a kind of off-axis short focus orthographic projection optical screen according to claim 1, the mirror surface antireflecting layer and function
Ergosphere is electroplated respectively or prints or be sprayed on the tow sides of first base material (7), the refractive index of the mirror surface antireflecting layer
Less than the refractive index of first base material.
3. a kind of off-axis short focus orthographic projection optical screen according to claim 1, the cylindrical lenses layer presses vertical array
Arrangement, the refractive index of cylindrical lenses layer are less than the refractive index of coloring layer and diffusion layer.
4. a kind of off-axis short focus orthographic projection optical screen according to claim 1, Fresnel Lenses layer (3) coating the
On two substrates (8)；
The section of Fresnel Lenses layer is jagged trigone lens array, and each prism array structure is made of two planes,
It is directed towards projector's incident ray and the reflecting surface with the second substrate surface at angle α respectively, and incident away from projector
Light and with horizontal plane at the anti-light surface of angle β；The angle α of Fresnel Lenses layer reflecting surface and substrate surface is along far from projection
The direction of machine remains unchanged or is gradually increased；The angle β of the anti-light surface of Fresnel Lenses layer and horizontal plane is equal to entering for projector
The angle of light and horizontal plane is penetrated, and is gradually increased along the direction far from projector.
Fresnel Lenses layer is arranged by circle ring array or linear array arrangement, the section indention shape of Fresnel Lenses layer；It is luxuriant and rich with fragrance
The angle α of Nie Er lens jacket reflecting surface and substrate surface is remained unchanged or is gradually increased along the direction far from projector；Fresnel
The angle β of the anti-light surface of lens jacket and horizontal plane is equal to the incident ray of projector and the angle of horizontal plane.
5. a kind of off-axis short focus orthographic projection optical screen according to claim 4, which is characterized in that the Fresnel Lenses
Layer reflecting surface to visible light using there is the highly reflecting films of high specular reflectivity to be made, in visible light 380nm~780nm model
Enclose interior highest reflectivity more than or equal to 90%, average reflectance be more than or equal to 80%, highly reflecting films with a thickness of 0.05 μm~1
μm；
The anti-light surface of Fresnel Lenses layer is made of black material, for absorbing environment spurious rays, improves Display Contrast；
The adjacent prism tooth tip spacing γ of Fresnel Lenses layer is remained unchanged along the direction far from projector or is gradually subtracted
It is small, and the spacing meets L1/10≤γ≤L1/ 2, L1For projected image pixel wide.
6. a kind of off-axis short focus orthographic projection optical screen according to claim 4, which is characterized in that second substrate makes
It is closed with hard high molecular material and functional layer and Fresnel Lenses lamination to form hard curtain, or saturating using soft material and column
Mirror layer and functional layer pressing are to form supporting part.
7. a kind of off-axis short focus front projection display system, which is characterized in that including light described in claim 1~6 any one
Learn projection screen, and the off-axis short focus projector positioned at optical screen side.
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| CN201910017661.8A CN109725484B (en) | 2019-01-08 | 2019-01-08 | Off-axis short-focus orthographic projection optical screen and projection display system |
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| CN201910017661.8A CN109725484B (en) | 2019-01-08 | 2019-01-08 | Off-axis short-focus orthographic projection optical screen and projection display system |
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| CN109725484B CN109725484B (en) | 2022-03-04 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110161756A (en) * | 2019-06-20 | 2019-08-23 | 山东公信安全科技有限公司 | A kind of color liquid crystal screen back light for outdoor instrument |
| CN110908235A (en) * | 2019-12-21 | 2020-03-24 | 成都菲斯特科技有限公司 | Projection screen and projection system |
| CN111538204A (en) * | 2020-06-22 | 2020-08-14 | 成都菲斯特科技有限公司 | Reflection-type projection screen and projection system |
| WO2021103968A1 (en) * | 2019-11-25 | 2021-06-03 | 深圳光峰科技股份有限公司 | Projection screen and projection system |
| CN113238452A (en) * | 2021-05-24 | 2021-08-10 | 青岛海信激光显示股份有限公司 | Speckle-dissipating projection screen and projection system |
| CN114002907A (en) * | 2020-07-28 | 2022-02-01 | 华为技术有限公司 | Light-resistant curtain and projection system |
| WO2022036554A1 (en) * | 2020-08-18 | 2022-02-24 | 深圳市光科全息技术有限公司 | Projection screen and production process therefor |
| WO2022152310A1 (en) * | 2021-01-18 | 2022-07-21 | 维业达科技(江苏)有限公司 | Projector curtain |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1670618A (en) * | 2004-03-15 | 2005-09-21 | 株式会社有泽制作所 | Reflex-type screen assembly |
| CN1791809A (en) * | 2003-05-20 | 2006-06-21 | 汤姆森特许公司 | Fresnel lens, projection screen, corresponding projection device and system. |
| JP2012252057A (en) * | 2011-05-31 | 2012-12-20 | Dainippon Printing Co Ltd | Reflection screen and image display system |
| CN104076589A (en) * | 2014-07-21 | 2014-10-01 | 成都菲斯特科技有限公司 | Positive projection optical screen projection system short in projection distance |
| JP2014199380A (en) * | 2013-03-30 | 2014-10-23 | 大日本印刷株式会社 | Reflective screen and image display system |
| CN208334896U (en) * | 2018-06-28 | 2019-01-04 | 成都菲斯特科技有限公司 | A kind of the Fresnel orthographic projection optical screen and projection display system of cylindrical optic structure |
-
2019
- 2019-01-08 CN CN201910017661.8A patent/CN109725484B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1791809A (en) * | 2003-05-20 | 2006-06-21 | 汤姆森特许公司 | Fresnel lens, projection screen, corresponding projection device and system. |
| CN1670618A (en) * | 2004-03-15 | 2005-09-21 | 株式会社有泽制作所 | Reflex-type screen assembly |
| JP2012252057A (en) * | 2011-05-31 | 2012-12-20 | Dainippon Printing Co Ltd | Reflection screen and image display system |
| JP2014199380A (en) * | 2013-03-30 | 2014-10-23 | 大日本印刷株式会社 | Reflective screen and image display system |
| CN104076589A (en) * | 2014-07-21 | 2014-10-01 | 成都菲斯特科技有限公司 | Positive projection optical screen projection system short in projection distance |
| CN208334896U (en) * | 2018-06-28 | 2019-01-04 | 成都菲斯特科技有限公司 | A kind of the Fresnel orthographic projection optical screen and projection display system of cylindrical optic structure |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110161756A (en) * | 2019-06-20 | 2019-08-23 | 山东公信安全科技有限公司 | A kind of color liquid crystal screen back light for outdoor instrument |
| WO2021103968A1 (en) * | 2019-11-25 | 2021-06-03 | 深圳光峰科技股份有限公司 | Projection screen and projection system |
| CN110908235A (en) * | 2019-12-21 | 2020-03-24 | 成都菲斯特科技有限公司 | Projection screen and projection system |
| CN111538204A (en) * | 2020-06-22 | 2020-08-14 | 成都菲斯特科技有限公司 | Reflection-type projection screen and projection system |
| CN114002907A (en) * | 2020-07-28 | 2022-02-01 | 华为技术有限公司 | Light-resistant curtain and projection system |
| WO2022036554A1 (en) * | 2020-08-18 | 2022-02-24 | 深圳市光科全息技术有限公司 | Projection screen and production process therefor |
| CN114450629A (en) * | 2020-08-18 | 2022-05-06 | 深圳市光科全息技术有限公司 | Projection screen and production process thereof |
| WO2022152310A1 (en) * | 2021-01-18 | 2022-07-21 | 维业达科技(江苏)有限公司 | Projector curtain |
| CN113238452A (en) * | 2021-05-24 | 2021-08-10 | 青岛海信激光显示股份有限公司 | Speckle-dissipating projection screen and projection system |
| WO2022247429A1 (en) * | 2021-05-24 | 2022-12-01 | 青岛海信激光显示股份有限公司 | Speckle-reducing projection screen and projection system |
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