CN111427229A - Projection screen and projection system - Google Patents
Projection screen and projection system Download PDFInfo
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- CN111427229A CN111427229A CN201811562170.3A CN201811562170A CN111427229A CN 111427229 A CN111427229 A CN 111427229A CN 201811562170 A CN201811562170 A CN 201811562170A CN 111427229 A CN111427229 A CN 111427229A
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/54—Accessories
- G03B21/56—Projection screens
- G03B21/60—Projection screens characterised by the nature of the surface
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/48—Laser speckle optics
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Overhead Projectors And Projection Screens (AREA)
- Optical Elements Other Than Lenses (AREA)
- Projection Apparatus (AREA)
Abstract
The embodiment of the invention provides a projection screen and a projection system, relates to the field of projection screens, and can better inhibit the appearance of speckle phenomenon on the basis of ensuring the image resolution of a projected image. The projection screen is used for reflecting the projection light beams of the projector, and comprises a light-condensing layer arranged on the light-emitting side of the coloring layer and a surface scattering layer arranged on the light-emitting side of the light-condensing layer in the reflection direction of the projection light beams; the light condensing layer is used for condensing the projection light beam emitted by the coloring layer; the roughness of the surface scattering layer, which is far away from the light-gathering layer, is more than or equal to the preset roughness; the surface scattering layer is used for scattering the projection light beams converged by the light condensation layer and then enabling the light beams to be incident to human eyes outside the projection screen.
Description
Technical Field
The invention relates to the field of projection screens, in particular to a projection screen and a projection system.
Background
"speckle" is also known as laser speckle. The speckle phenomenon is commonly existed in the optical imaging process, and the phenomenon of laser speckle is more obvious due to the high coherence of laser. When laser speckle is the diffuse reflection of laser light from the surface of a scattering body or through a transparent scattering body (such as ground glass), a randomly distributed bright and dark spot can be observed in the light field on or near the scattering surface. In the laser projection technology, since laser needs to transmit through a projection lens of a projector, and the projection lens is a transparent scatterer, when a laser beam emitted through the projection lens is projected onto a projection screen, a speckle problem occurs. At present, the most serious speckle is in an RGB three-color laser light source, because three kinds of laser have coherence, and the occurrence of the speckle has a lot of relations with the coherence of the laser, although the RGB laser light source is the most advanced, the speckle problem is the most difficult to solve.
Because the severity of speckles of the two-color laser light source is weaker than that of a three-color laser light source, and the severity of speckles of the single-color laser light source is weaker than that of the two-color laser light source, the speckle problem cannot be basically noticed by a user when the user uses the laser projection screen which is used at present although the laser projection screen has a certain inhibition effect on the speckles of the two-color laser light source and the single-color laser light source; however, when the three-color laser light source is used as the laser projection light source, the capability of suppressing speckles is much poorer, so that a user can easily perceive the speckle problem when watching the laser projection light source, and the user experience is seriously influenced.
Disclosure of Invention
Embodiments of the present invention provide a projection screen and a projection system, which can better suppress the appearance of speckle phenomenon on the basis of ensuring the image resolution of a projected image.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
in a first aspect, a projection screen for reflecting a projection beam of a projector is provided; in the reflection direction of the projection light beams, the projection screen comprises a light-condensing layer arranged on the light-emitting side of the coloring layer and a surface scattering layer arranged on the light-emitting side of the light-condensing layer;
the light condensing layer is used for condensing the projection light beam emitted by the coloring layer;
the roughness of the surface scattering layer, which is far away from the light-gathering layer, is more than or equal to the preset roughness;
the surface scattering layer is used for scattering the projection light beams converged by the light condensation layer and then enabling the light beams to be incident to human eyes outside the projection screen.
In a second aspect, there is provided a projection system comprising a projector for emitting a projection beam comprising a laser beam towards a projection screen as provided in the first aspect.
According to the projection screen and the projection system provided by the embodiment of the invention, the projection screen comprises a light-condensing layer arranged on the light-emitting side of the coloring layer and a surface scattering layer arranged on the light-emitting side of the light-condensing layer in the reflection direction of the projection light beam; the light condensing layer is used for condensing the projection light beam emitted by the coloring layer; the roughness of the surface scattering layer, which is far away from the light-gathering layer, is more than or equal to the preset roughness; the surface scattering layer is used for scattering the projection light beams converged by the light condensation layer and then enabling the light beams to be incident to human eyes outside the projection screen. Because the light-emitting side of the projection screen is provided with the surface scattering layer with the roughness more than or equal to the preset roughness, the larger the surface roughness of the projection screen is, the higher the scattering degree of the reflected projection light beam is, and the higher the scattering degree is, the better scattering effect on speckles existing in the projection light beam is realized, the occurrence of speckle phenomena is better inhibited, and the experience of a user using the projection screen is improved; however, if only the roughness of the projection screen is increased, although the generation of speckles is better inhibited, because the rough surface has a scattering effect on the projection light beams, the gain and the resolution of the projection screen per se are reduced, that is, the blurred resolution of the projected image is reduced, so in order to avoid this, in the technical scheme provided by the embodiment of the invention, a light condensing layer is further arranged on one side of the surface scattering layer, which is close to the colored layer, and is used for condensing the projection light beams emitted from the colored layer, that is, the projection light beams reflected by the projection screen, converging the angle of the projection light beams, increasing the gain of the projection screen, and reducing the size of the projected image to achieve the purpose of improving the resolution, thereby offsetting the reduced gain of the projection screen and the reduced resolution of the projected image caused by the surface scattering layer. Therefore, the technical scheme provided by the embodiment of the invention can better inhibit the appearance of the speckle phenomenon on the basis of ensuring the clear imaging of the projection screen.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a laser projection screen according to the prior art;
fig. 2 is a schematic structural diagram of a projection screen according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of another projection screen provided in an embodiment of the present invention;
FIG. 4 is a schematic structural diagram of a convergence structure layer provided in an embodiment of the present invention;
fig. 5 is a schematic structural diagram of another projection screen according to an embodiment of the present invention;
fig. 6 is a schematic structural diagram of a projection system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, in the embodiments of the present invention, words such as "exemplary" or "for example" are used to indicate examples, illustrations or explanations. Any embodiment or design described as "exemplary" or "e.g.," an embodiment of the present invention is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, use of the word "exemplary" or "such as" is intended to present concepts related in a concrete fashion.
It should be noted that, in the embodiments of the present invention, "of", "corresponding" and "corresponding" may be sometimes used in combination, and it should be noted that, when the difference is not emphasized, the intended meaning is consistent.
For the convenience of clearly describing the technical solutions of the embodiments of the present invention, in the embodiments of the present invention, the words "first", "second", and the like are used for distinguishing the same items or similar items with basically the same functions and actions, and those skilled in the art can understand that the words "first", "second", and the like are not limited in number or execution order.
Referring to fig. 1, in a conventional laser projection screen 10, a hard mask layer HardCoat L a layer 11, a coloring layer Tint L a layer 12, a diffusion layer diffuiser L a layer 13, a Fresnel projection layer Fresnel lens14 and a reflection layer Reflective layer15 are sequentially arranged along an incident direction of a projection beam, the projection beam incident into the laser projection screen is reflected to the Fresnel lens layer 14 through the reflection layer15, the Fresnel lens layer 14 uniformly focuses the projection beam and then emits the projection beam to the diffusion layer 13, the diffusion layer 13 diffuses the projection beam and then emits the projection beam to the coloring layer 12, the coloring layer 12 removes background light from the projection beam and then emits the projection beam to the hard mask layer 11, because one surface of a light-emitting side of the hard mask layer 11 has a certain roughness, the projection beam after being diffused through the hard mask layer will scatter the speckle of the projection beam itself, and the phenomenon of laser projection on the projection screen is suppressed, but the conventional laser projection screen has a better two-color forming laser speckle degree of speckle, and therefore, the conventional laser projection screen has a better speckle suppression effect on the monochromatic laser light source, and the conventional laser projection screen has a better speckle effect of suppressing the speckle phenomenon, and the monochromatic speckle effect of the monochromatic speckle phenomenon is better than that the monochromatic speckle phenomenon is not suppressed.
In view of the above problem, referring to fig. 2, an embodiment of the present invention provides a projection screen 20, where the projection screen 20 is used for reflecting a projection beam of a projector; the projection screen 20 includes a light-condensing layer 22 disposed on the light-exit side of the colored layer 21, and a surface scattering layer 23 disposed on the light-exit side of the light-condensing layer 22 in the reflection direction of the projection light beam;
the light-condensing layer 22 is used for condensing the projection light beam emitted by the colored layer 21;
the roughness of the surface scattering layer 23 away from the light-condensing layer 22 is greater than or equal to the preset roughness; the surface scattering layer 23 is used for scattering the projection light beam condensed by the condensing layer 22 and then is incident on human eyes outside the projection screen.
For example, the predetermined roughness may be 0.5 μm, that is, the surface of the surface scattering layer away from the light-condensing layer provided by the embodiment of the present invention has a roughness Ra value of 0.5 μm or more.
According to the projection screen provided by the embodiment, because the light-emitting side of the projection screen is provided with the surface scattering layer with the roughness more than or equal to the preset roughness, when the surface roughness of the projection screen is larger, the reflected projection light beam is higher in scattering degree, and the higher the scattering degree is, the better scattering effect is achieved on speckles existing in the projection light beam, the appearance of the speckle phenomenon is better inhibited, and the experience degree of a user using the projection screen is improved; however, if only the roughness of the projection screen is increased, although the generation of speckles is better inhibited, because the rough surface has a scattering effect on the projection light beams, the gain and the resolution of the projection screen per se are reduced, that is, the blurred resolution of the projected image is reduced, so in order to avoid this, in the technical scheme provided by the embodiment of the invention, a light condensing layer is further arranged on one side of the surface scattering layer, which is close to the colored layer, and is used for condensing the projection light beams emitted from the colored layer, that is, the projection light beams reflected by the projection screen, converging the angle of the projection light beams, increasing the gain of the projection screen, and reducing the size of the projected image to achieve the purpose of improving the resolution, thereby offsetting the reduced gain of the projection screen and the reduced resolution of the projected image caused by the surface scattering layer. Therefore, the technical scheme provided by the embodiment of the invention can better inhibit the appearance of the speckle phenomenon on the basis of ensuring the clear imaging of the projection screen.
Specifically, referring to fig. 3, the surface scattering layer 23 includes a first substrate 231 and a surface coating layer 232 disposed on a side of the first substrate 231 away from the light-condensing layer 22;
for example, in view of cost reduction, the material of the first substrate 231 may be PET (polyethylene terephthalate), and the material of the surface coating layer 232 may be a shadowless glue (UV glue);
the roughness of the surface coating layer 232 away from the first substrate 231 is greater than or equal to a preset roughness;
the surface coating layer 232 is used for scattering the projection beam emitted from one surface of the first substrate 231 close to the surface coating layer 232 and then is incident to human eyes outside the projection screen;
specifically, the surface coating layer 232 is formed on the first substrate 231 using a shadow-free adhesive by a roll imprinting process.
Specifically, as shown in fig. 3, the light-condensing layer 22 includes a second substrate 221 and a condensing structure layer 222 disposed on a surface of the second substrate 221 away from the colored layer 21;
the converging structure layer 222 comprises at least two converging structures, and the at least two converging structures are arranged in parallel on the side of the second substrate 221 away from the reflective layer 26;
for example, in view of cost reduction, the material of the second substrate 221 may be PET, and the material of the convergence structure layer 222 may be shadowless glue (UV glue);
the converging structure is used for converging the projection light beam emitted from one surface of the second substrate 221 close to the converging structure layer 222;
exemplary, converging structures include, but are not limited to, any of the following: triangular prisms, cylindrical, saw-tooth prisms; when the converging structure is a triangular prism, the specific structure of the converging structure layer 222 is shown in fig. 4, and when a light beam enters from the second substrate and exits from the converging structure layer, each converging structure can converge the light beam according to the refraction principle.
Specifically, the converging structure layer 222 is formed on the second substrate 221 by a roll embossing process using a shadow-free glue.
Referring to fig. 2, a projection screen provided in an embodiment of the present invention further includes: a diffusion layer 24, a fresnel lens layer 25, and a reflection layer 26;
the diffusion layer 24 is arranged on one surface of the coloring layer 21 far away from the light-condensing layer 22; in addition, the diffusion layer 24 includes at least two scattering particles, and the material of the scattering particles includes organic glass;
the fresnel lens layer 25 is provided on a surface of the diffusion layer 24 away from the colored layer 21;
the reflective layer 26 is disposed on a side of the fresnel lens layer 25 remote from the diffuser layer 24.
Illustratively, the colored layer 23 is specifically configured to filter out background light other than the projection light beam in practice, so as to ensure the imaging quality, and the material of the colored layer 23 may be an MS plate (a copolymer synthesized by Polymethyl Methacrylate (PMMA) and 50% styrene (PS), and the material of the diffusion layer 24 other than the scattering particles is the same as the material of the colored layer 23.
Alternatively, taking the converging structure as a triangular prism as an example, referring to fig. 5, the coloring layer 21, the light-gathering layer 22 and the surface scattering layer 23 are fixed by adhering with a transparent optical adhesive 27; meanwhile, in order to ensure that the light-condensing layer 22 refracts the optical fiber, an air layer must be left on the surface of the light-condensing layer 22 close to the surface scattering layer 23.
The projection screen provided by the embodiment of the invention comprises a light-condensing layer arranged on the light-emitting side of a coloring layer and a surface scattering layer arranged on the light-emitting side of the light-condensing layer in the reflection direction of a projection beam; the light condensing layer is used for condensing the projection light beam emitted by the coloring layer; the roughness of the surface scattering layer, which is far away from the light-gathering layer, is more than or equal to the preset roughness; the surface scattering layer is used for scattering the projection light beams converged by the light condensation layer and then enabling the light beams to be incident to human eyes outside the projection screen. Because the light-emitting side of the projection screen is provided with the surface scattering layer with the roughness more than or equal to the preset roughness, the larger the surface roughness of the projection screen is, the higher the scattering degree of the reflected projection light beam is, and the higher the scattering degree is, the better scattering effect on speckles existing in the projection light beam is realized, the occurrence of speckle phenomena is better inhibited, and the experience of a user using the projection screen is improved; however, if only the roughness of the projection screen is increased, although the generation of speckles is better inhibited, because the rough surface has a scattering effect on the projection light beams, the gain and the resolution of the projection screen per se are reduced, that is, the blurred resolution of the projected image is reduced, so in order to avoid this, in the technical scheme provided by the embodiment of the invention, a light condensing layer is further arranged on one side of the surface scattering layer, which is close to the colored layer, and is used for condensing the projection light beams emitted from the colored layer, that is, the projection light beams reflected by the projection screen, converging the angle of the projection light beams, increasing the gain of the projection screen, and reducing the size of the projected image to achieve the purpose of improving the resolution, thereby offsetting the reduced gain of the projection screen and the reduced resolution of the projected image caused by the surface scattering layer. Therefore, the technical scheme provided by the embodiment of the invention can better inhibit the appearance of the speckle phenomenon on the basis of ensuring the clear imaging of the projection screen.
Referring to fig. 6, an embodiment of the present invention further provides a projection system, which includes a projector 61 and a projection screen 62 provided in the above embodiment, wherein the projector 61 is configured to emit a projection beam to the projection screen 62, and the projection beam includes a laser beam.
Because the projection screen provided by the embodiment of the invention is adopted in the projection system provided by the embodiment of the invention, the generation of the speckle phenomenon can be better inhibited on the basis of ensuring the image quality of the projected image.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A projection screen for reflecting a projection beam of a projector; in the reflection direction of the projection light beams, the projection screen comprises a light-condensing layer arranged on the light-emitting side of the coloring layer and a surface scattering layer arranged on the light-emitting side of the light-condensing layer;
the light condensing layer is used for condensing the projection light beam emitted by the colored layer;
the roughness of one surface of the surface scattering layer, which is far away from the light-gathering layer, is more than or equal to the preset roughness;
the surface scattering layer is used for scattering the projection light beams converged by the light condensation layer and then enabling the light beams to be incident to human eyes outside the projection screen.
2. The projection screen of claim 1 wherein the surface scattering layer comprises a first substrate and a surface coating layer disposed on a side of the first substrate distal from the light-concentrating layer;
the roughness of one surface of the surface coating layer, which is far away from the first base material, is greater than the preset roughness;
the surface coating layer is used for scattering the projection light beam emitted from one surface of the first substrate, which is close to the surface coating layer, and then the projection light beam is incident to human eyes outside the projection screen.
3. The projection screen of claim 1 wherein the light-concentrating layer comprises a second substrate and a concentrating structure layer disposed on a side of the second substrate distal from the colored layer;
the converging structure layer comprises at least two converging structures, and the at least two converging structures are arranged on one side, far away from the reflecting layer, of the second substrate in parallel;
the converging structure is used for converging the projection light beam emitted from one surface of the second substrate close to the converging structure layer.
4. The projection screen of claim 1, further comprising: a diffusion layer, a Fresnel lens layer and a reflective layer;
the diffusion layer is arranged on one surface of the coloring layer far away from the light-gathering layer;
the Fresnel lens layer is arranged on one surface of the diffusion layer, which is far away from the coloring layer;
the reflecting layer is arranged on one surface of the Fresnel lens layer far away from the diffusion layer.
5. The projection screen of claim 1 wherein the colored layer, the light-concentrating layer, and the surface scattering layer are affixed using a transparent optical adhesive.
6. The projection screen of claim 2 wherein the surface coating is formed on the first substrate using a roll embossing process using a shadowless glue.
7. The projection screen of claim 3 wherein the collection structure layer is formed on the second substrate using a roll embossing process using a shadowless glue.
8. The projection screen of claim 3 wherein the convergence structure comprises any one of: triangular prism, cylindrical, saw-tooth prism.
9. The projection screen of claim 4 wherein the diffusion layer comprises at least two scattering particles, the material of the scattering particles comprising plexiglass.
10. A projection system comprising a projector and a projection screen according to any one of claims 1 to 8, wherein the projector is adapted to emit a projection beam towards the projection screen, the projection beam comprising a laser beam.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811562170.3A CN111427229A (en) | 2018-12-20 | 2018-12-20 | Projection screen and projection system |
| PCT/CN2019/125890 WO2020125610A1 (en) | 2018-12-20 | 2019-12-17 | Projection screen and projection system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811562170.3A CN111427229A (en) | 2018-12-20 | 2018-12-20 | Projection screen and projection system |
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| CN111427229A true CN111427229A (en) | 2020-07-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811562170.3A Pending CN111427229A (en) | 2018-12-20 | 2018-12-20 | Projection screen and projection system |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN111427229A (en) |
| WO (1) | WO2020125610A1 (en) |
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| CN113641076A (en) * | 2021-10-18 | 2021-11-12 | 成都菲斯特科技有限公司 | Projection screen and projection system |
| CN114660882A (en) * | 2020-12-22 | 2022-06-24 | 宁波激智科技股份有限公司 | Speckle-dispelling laser television screen and preparation method thereof |
| CN114660885A (en) * | 2020-12-22 | 2022-06-24 | 宁波激智科技股份有限公司 | Speckle-dispelling laser television screen and preparation method thereof |
| WO2022166411A1 (en) * | 2021-02-04 | 2022-08-11 | 青岛海信激光显示股份有限公司 | Projection screen and projection system |
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| CN114660882A (en) * | 2020-12-22 | 2022-06-24 | 宁波激智科技股份有限公司 | Speckle-dispelling laser television screen and preparation method thereof |
| CN114660885A (en) * | 2020-12-22 | 2022-06-24 | 宁波激智科技股份有限公司 | Speckle-dispelling laser television screen and preparation method thereof |
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| WO2022166411A1 (en) * | 2021-02-04 | 2022-08-11 | 青岛海信激光显示股份有限公司 | Projection screen and projection system |
| CN113641076A (en) * | 2021-10-18 | 2021-11-12 | 成都菲斯特科技有限公司 | Projection screen and projection system |
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| Publication number | Publication date |
|---|---|
| WO2020125610A1 (en) | 2020-06-25 |
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