CN110824825A - Projection screen and projection system - Google Patents
Projection screen and projection system Download PDFInfo
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- CN110824825A CN110824825A CN201911331533.7A CN201911331533A CN110824825A CN 110824825 A CN110824825 A CN 110824825A CN 201911331533 A CN201911331533 A CN 201911331533A CN 110824825 A CN110824825 A CN 110824825A
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/54—Accessories
- G03B21/56—Projection screens
- G03B21/60—Projection screens characterised by the nature of the surface
- G03B21/62—Translucent screens
- G03B21/625—Lenticular translucent screens
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- 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
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- Overhead Projectors And Projection Screens (AREA)
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Abstract
The invention provides a projection screen and a projection system, belonging to the technical field of optical projection, wherein the projection screen comprises a circular Fresnel lens layer, an imaging element layer, an optical structure layer and a reflecting layer which are sequentially arranged along the thickness direction; the circular Fresnel lens layer is composed of a plurality of circular Fresnel lens structures with the circle centers at the same point; the optical structure layer is composed of a plurality of linear triangular optical structures which are mutually arranged in a row, the cross section of the optical structure layer along the thickness direction is in a sawtooth shape, and the vertex angle of the linear triangular optical structure far away from the imaging element layer is 70-110 degrees. The projection system is composed of the projection screen and the projection device. The projection screen and the projection system have the advantages of high brightness, high light energy utilization rate, high image definition, good ambient light resistance, high contrast and excellent projection display effect.
Description
Technical Field
The invention relates to the technical field of optical projection, in particular to a projection screen and a projection system.
Background
With the continuous development of screen display technology, projection is widely used as a simple and convenient display mode, for example, for family entertainment life or office needs. Among them, when displaying by projection, one indispensable device is a projection screen. Thus, the level of projection screen performance directly determines how well the projection display is acceptable to the viewer.
The conventional projection screen such as a white plastic screen can only perform diffuse reflection on a light beam output by a projection device, cannot effectively control the transmission direction of the light beam, and cannot effectively control the transmission of ambient light, so that the brightness of the projection screen is uneven, the overall brightness coefficient is low, and the light energy utilization rate is low; because the traditional projection screen has no light resistance, the displayed image has poor definition and poor controllability of viewing angle; projection systems formed from commonly used projection screens require the projection device to be relatively powerful in order to meet the image display requirements, resulting in higher energy consumption losses.
In the projection system shown in fig. 1, the projection screen adopts a linear micro-optical structure 104 arranged perpendicular to the horizontal direction, the projection device T emits a projection beam E to the projection screen, and when the projection beam E is incident perpendicular to the linear micro-optical structure 104, the projection beam E is totally reflected to the viewing area to obtain a light beam E in the viewing area1(ii) a When the projection beam is not incident perpendicular to the linear micro-optical structure 104, the projection beam E is reflected to the outside of the viewing area from the surface of the projection screen deviating from the incident direction to obtain a light E outside the viewing area2. Similarly, in the projection system shown in fig. 2, the projection screen adopts the linear micro-optical structure 104 arranged along the horizontal direction, the projection device T emits the projection light beam E to the projection screen, and when the projection light beam E is incident perpendicularly to the linear micro-optical structure 104, the projection light beam E is totally reflected to the viewing area to obtain the light beam E in the viewing area1(ii) a When the projection beam is not incident perpendicular to the linear micro-optical structure 104, the projection beam E is reflected to the outside of the viewing area from the surface of the projection screen deviating from the incident direction to obtain a light E outside the viewing area2. Both of these two projection systems can cause the projection beam E not to be fully utilized effectively, increasing the energy consumption of the projection device. The concrete expression is as follows: the display brightness of the projection screen is high at the position where the projection screen is opposite to the incident projection beam E of the projection device T, the display brightness is low at the position deviated from the incident projection beam E of the projection device, and the display brightness is lower at the position deviated from the incident projection beam E on the projection screen, so that the uniformity of the brightness of the projection screen is greatly limitedThe performance, viewing angle, and image contrast increase the power consumption of the projection system.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a projection screen and a projection system, so as to solve the problems of low brightness uniformity, low image contrast, low light energy utilization rate and high energy consumption of the projection system of the conventional projection screen and system.
In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:
a projection screen comprises a circular Fresnel lens layer, an imaging element layer, an optical structure layer and a reflecting layer which are sequentially arranged along the thickness direction; the circular Fresnel lens layer is composed of a plurality of circular Fresnel lens structures with the circle centers at the same point; the optical structure layer is composed of a plurality of linear triangular optical structures which are mutually arranged in a row, the cross section of the optical structure layer along the thickness direction is in a sawtooth shape, and the vertex angle of the linear triangular optical structure far away from the imaging element layer is 70-110 degrees.
In a preferable selection of the embodiment of the present invention, in the projection screen, a scratch resistant layer is further included, and the scratch resistant layer is disposed on a side of the circular fresnel lens layer away from the imaging element layer.
In a preferable selection of the embodiment of the present invention, in the projection screen, a cross section of the circular fresnel lens layer in a thickness direction is saw-toothed.
In a preferred option of the embodiment of the present invention, in the projection screen, the imaging element layer includes at least one of a diffusion particle layer, a dot lens layer, a diffusion surface layer, and a cylindrical microlens layer.
In a preferred option of the embodiment of the present invention, in the projection screen, the diffusion particle layer includes a transparent resin layer mixed with diffusion particles, and the diffusion particles are spheres or polyhedrons.
In a preferred option of the embodiment of the present invention, in the projection screen, at least one of the dot lens layers is provided, and at least one surface of each of the dot lens layers perpendicular to the thickness direction is provided with a dot lens.
In a preferred option of the embodiment of the present invention, in the projection screen, at least one diffusion surface layer is provided, and at least one surface of each diffusion surface layer in a direction perpendicular to the thickness direction is a non-smooth surface.
In a preferred option of the embodiment of the present invention, in the projection screen, the number of the lenticular microlens layers is not less than one, each lenticular microlens layer includes a plurality of linear lenticular microlenses arranged in rows, and a cross section of each lenticular microlens layer in a thickness direction is a plurality of circles, ellipses, paraboloids, arches, or polygons arranged in each row.
In a preferred option of the embodiment of the present invention, in the projection screen, the reflective layer is disposed on the optical structure layer by at least one of electroplating, vacuum plating, printing, spraying, or coating and transferring.
A projection system comprises a projection device and a projection screen for imaging display based on projection light beams output by the projection device, wherein the projection screen comprises a circular Fresnel lens layer, an imaging element layer, an optical structure layer and a reflecting layer which are sequentially arranged along the thickness direction; the circular Fresnel lens layer is composed of a plurality of circular Fresnel lens structures with the circle centers at the same point; the optical structure layer is composed of a plurality of linear triangular optical structures which are mutually arranged in a row, the cross section of the optical structure layer along the thickness direction is in a sawtooth shape, and the vertex angle of the linear triangular optical structure far away from the imaging element layer is 70-110 degrees.
According to the projection screen provided by the embodiment of the invention, by arranging the optical structure layer, the imaging element layer and the circular Fresnel lens layer, projection beams can be uniformly diffused and imaged on the imaging element layer, and the brightness uniformity and the image definition of the projection screen are effectively improved; the arrangement of the optical structure layer can effectively control the transmission direction of the projection light beam, effectively control the viewing angle and improve the optical utilization rate of the projection screen; the arrangement of the circular Fresnel lens layer, the optical structure layer and the reflection layer weakens the reflection of the surface of the projection screen; through set up the scratch resistance layer in circular fresnel lens layer keeps away from one side on imaging element layer, prevented that projection screen from by the fish tail in transportation, use maintenance process, further guarantee projection screen's outward appearance. The projection system formed by the projection screen and the projection device effectively improves the utilization rate of light energy, reduces the power required by the projection device, further reduces the energy consumption of the whole projection system, and has the advantages of high brightness, high utilization rate of light energy, high image definition, good ambient light resistance, high contrast and excellent projection display effect.
In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
FIG. 1 is a schematic diagram of an optical path of a first prior art projection system;
FIG. 2 is a schematic diagram of an optical path of a second prior art projection system;
FIG. 3 is a schematic view of a projection system according to an embodiment of the present invention;
FIG. 4 is a schematic cross-sectional view of a circular Fresnel lens layer of a projection screen according to an embodiment of the present invention along the thickness direction;
FIG. 5 is a first schematic view of a circular Fresnel lens layer of a projection screen according to an embodiment of the present invention;
FIG. 6 is a second schematic diagram of a circular Fresnel lens layer of a projection screen according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a light path of a projection beam of a circular Fresnel lens layer of a projection screen according to an embodiment of the present invention;
FIG. 8 is a schematic structural diagram of an imaging element layer provided in accordance with an embodiment of the present invention;
fig. 9 is a schematic structural diagram of a diffusion particle layer provided in an embodiment of the present invention;
fig. 10 is a schematic structural diagram of a dot lens layer according to an embodiment of the invention;
FIG. 11 is a schematic structural diagram of a diffusion surface layer according to an embodiment of the present invention;
FIG. 12 is a schematic structural diagram of a lenticular microlens layer according to an embodiment of the present invention;
FIG. 13 is a schematic cross-sectional view of an optical structure layer provided in accordance with an embodiment of the present invention;
FIG. 14 is a schematic diagram of a front projection screen according to an embodiment of the present invention reflecting ambient light above the screen;
fig. 15 is a schematic diagram of a front projection system according to an embodiment of the present invention.
Icon: 10-a projection system; 20-a projection screen; 100-a circular fresnel lens layer; 101-an optical structure layer; 102-a reflective layer; 103-an imaging element layer; 104-linear micro-optical structure; 105-a layer of diffusing particles; 106-dot lens layer; 107-diffusion surface layer; 108-a lenticular layer; 111-circular fresnel lens structure; 112-linear triangular optical structures; 113-diffusion particles; 114-point lens; 115-non-smooth face; 116-linear cylindrical microlenses; 140-a transparent resin layer; 150-rough surface; c-circle center; c1-a geometric center; e-projecting the light beam; e1-light within the viewing area; e2-light outside the viewing zone, F-ambient light, G-viewer, T-projector, α -linear triangular optical structure apex angle, β -circular fresnel lens structure tooth apex angle, P-tooth intercept, H-tooth height.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, 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. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. 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: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures. In the description of the present invention, the terms "remote", "one side", and the like are used for distinguishing descriptions only and are not to be construed as limiting or implying relative importance.
In the description of the present invention, the terms "disposed" and the like are to be understood broadly unless otherwise explicitly specified and defined. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 3, an embodiment of the present invention provides a projection screen 20, which includes a circular fresnel lens layer 100, an imaging element layer 103, an optical structure layer 101, and a reflective layer 102 sequentially arranged along a thickness direction; the circular Fresnel lens layer is composed of a plurality of circular Fresnel lens structures 111 with the centers of circles at the same point; the optical structure layer 101 is composed of a plurality of linear triangular optical structures 112 arranged in a row, the cross section of the optical structure layer along the thickness direction is in a sawtooth shape, and the vertex angle of the linear triangular optical structure far away from the imaging element layer is 70-110 degrees.
As an alternative, in order to further improve the contrast and the appearance color effect of the projection screen, a toner or a dye may be added to the circular fresnel lens structure 111 of the circular fresnel lens layer 100, a toner or a dye may also be added to the imaging element layer 103, and a colored layer including a toner or a dye may also be disposed between the circular fresnel lens layer 100 and the optical structure layer 101, and the colored layer may be located on any side of the imaging element layer; the toner or dye has the function of absorbing ambient light to further adjust the image display color of the projection screen 20.
As an alternative, fine particles with different refractive indexes may be added to the circular fresnel lens structure 111 to enhance the brightness uniformity and the viewing angle range of the projection screen 20.
As an alternative, the projection screen 20 further includes a scratch resistant layer disposed on a side of the circular fresnel lens layer 100 away from the imaging element layer. The scratch-resistant layer can be a scratch-resistant protective film or a light-transmitting resin layer with higher hardness in a cured state, so that the projection screen 20 can be prevented from being scratched in the actual use process, the appearance integrity of the projection screen 20 is ensured, and the later-stage use and maintenance of the projection screen 20 are facilitated; the scratch-resistant layer is a microstructure manufactured by adopting an optical micromachining technology, and can also realize the effects of glare resistance and speckle inhibition on the surface of the projection screen.
It is understood that the reflectivity of the reflective layer 102 to visible light can be set according to the practical application requirement, i.e. according to the requirement for the imaging display effect. In particular, to ensure the best imaging effect, the reflectivity of the reflective layer 102 to visible light is greater than or equal to 60%. In addition, the thickness of the reflective layer 102 is not determined accordingly, and the thickness of the reflective layer 105 can be controlled to be 50nm to 50000nm for the best effect. The reflective layer 102 may be a metal reflective layer, an alloy reflective layer, or a non-metal composite reflective layer, as long as it has a certain reflective capability to visible light; the metal reflective layer includes, but is not limited to: aluminum, silver, gold, chromium, nickel, copper; the alloy reflective layer includes, but is not limited to: nichrome, aluminum alloy, titanium alloy; the non-metallic composite reflective layer includes, but is not limited to: TiO 22/SiO2，Nb2O5/SiO2，Ta2O5/SiO2，Al2O3/SiO2，HfO2/SiO2，TiO2/MgF2，Nb2O5/MgF2，Ta2O5/MgF2，Al2O3/MgF2，HfO2/MgF2The film stack structure is formed by alternately combining materials with equal height and low refractive index.
In this embodiment, the reflective layer 102 is prevented from being oxidized and deteriorated and falling off after long-term use, and the operation is prolongedThe service life of the projection screen, the projection screen 20 may further include a protective layer disposed on the surface of the reflective layer 102 away from the optical structure layer 101; the materials of the protective layer include, but are not limited to: SiO 22、Si3N4、Al2O3、SiCN、TiO2SiN, SiC, chromium, nickel, stainless steel, aluminum plates, glass plates, ceramic plates and iron plates, scratch-resistant resin, PET protective films, hot melt adhesives and the like.
Alternatively, the reflective layer 102 may be disposed on the optical structure layer 101 by at least one of electroplating, vacuum plating, printing, spraying, and coating transfer.
As shown in fig. 4, the cross section of the circular fresnel lens structure layer 100 in the thickness direction is saw-toothed, the circular fresnel lens structure layer is composed of a plurality of circular fresnel lens structures 111, and the tooth vertex angles β of the circular fresnel lens structures 111 may be all the same, or may be partially the same, or may be all different, and the angle of the tooth vertex angle β of the circular fresnel lens structure 111 may be adjusted according to the requirements of actual viewing field and light energy utilization, so as to obtain the best image display effect.
In practical application, the tooth profile vertex angle β, the tooth profile intercept P and the tooth profile height H of the circular Fresnel lens structure 111 can be adjusted according to the position of a projection light beam and the requirement of a viewing field, that is, parameters of the circular Fresnel lens structure 111 are used for matching the direction of the projection light beam, so that the projection light beams of various angles incident on the projection screen can be adjusted in the transmission direction by the circular Fresnel lens structure 111, and the transmission direction of the emergent projection light beam to a specific viewing field is adjusted.
As an optional mode, the tooth tips of the circular fresnel lens structure 111 may be made into an arc shape, so that the tooth tips of the arc fresnel lens structure 111 are smoother, the possibility that the tooth tips are worn due to being too sharp in the process of cleaning and wiping the surface of the projection screen is effectively reduced, and the protection of the tooth shape of the circular fresnel lens structure 111 is facilitated, so as to protect the projection screen.
Alternatively, a rough surface 150 may be formed on the tooth surface of the circular fresnel lens structure 111 by a micro-structure processing technique, so as to perform appropriate diffuse reflection on the incident projection light beam, prevent the projection light beam from being directionally reflected, and form bright interference fringes.
As shown in fig. 5, a first schematic diagram of a circular fresnel lens layer of a projection screen according to an embodiment of the present invention is shown. The circular fresnel lens structures 111 of the circular fresnel lens layer 100 are arranged in concentric circles. The center C of the circular fresnel lens structure 111 on the projection screen 20 is at the geometric center C of the projection screen 201。
Fig. 6 is a second schematic diagram of a circular fresnel lens layer of a projection screen according to an embodiment of the present invention. The circular fresnel lens structures 111 of the circular fresnel lens layer 100 are arranged in concentric circles, and the center C of the circular fresnel lens structure 111 is located at the geometric center C of the projection screen 201And (3) outside.
It can be understood that the circle center of the circular fresnel lens structure 111 can be adjusted according to actual conditions, so that the circular fresnel lens structure 111 is more matched with the projection light beams, and the transmission directions of the projection light beams in different directions can be adjusted.
As shown in fig. 7, a projection beam optical path diagram of a circular fresnel lens layer of a projection screen according to an embodiment of the present invention; the projection light beam E is incident on the circular Fresnel lens structure 111 of the circular Fresnel lens layer from various directions, is refracted by the circular Fresnel lens structure 111 to enter the projection screen, and is finally reflected to the viewing area to obtain the light E in the viewing area1. Through the setting of circular fresnel lens structure 111, match projection beam E more for the projection beam E that different directions were incited is adjusted to the viewing zone by corresponding circular fresnel lens structure 111.
Alternatively, as shown in fig. 8 to 12, the image forming element layer 103 in the projection screen 20 includes at least one of a diffusion particle layer 105, a dot lens layer 106, a diffusion surface layer 107, and a pillar microlens layer 108. That is, the imaging element layer 103 may be any one of the diffusion particle layer 105, the dot lens layer 106, the diffusion surface layer 107, and the pillar microlens layer 108; any two of the diffusion particle layer 105, the dot lens layer 106, the diffusion surface layer 107, and the pillar microlens layer 108 may be laminated; any three of the diffusion particle layer 105, the dot lens layer 106, the diffusion surface layer 107, and the pillar microlens layer 108 may be laminated without limiting the positional relationship; the diffusion particle layer 105, the dot lens layer 106, the diffusion surface layer 107, and the pillar microlens layer 108 may be laminated, and the positional relationship between the layers is not limited.
Specifically, the imaging element layer 103 may also be uniformly doped with pigment or toner, or a colored layer may be separately provided in the imaging element layer 103, and the position of the colored layer may be adjusted as needed, and the colored layer may be located between the structures of the imaging element layer 103 or outside the structures of the imaging element layer 103; the light with corresponding wavelength can be selectively absorbed, and the effect of improving the contrast of the projection screen is further realized.
Particularly, a speckle suppression layer is arranged on the surface of the imaging element layer 103 close to the circular fresnel lens layer 100, the speckle suppression layer is a microstructure manufactured by adopting an optical micromachining technology, and the positions of the speckle suppression layer are different from each other in phase of the projection beam, so that alternate bright and dark irregular spots generated by interference during imaging of the projection screen can be eliminated, and the image display definition of the projection screen 20 is improved.
As shown in fig. 8, the imaging element layer 103 is formed by laminating a diffusion surface layer 107, a diffusion particle layer 105, and a columnar microlens layer 108, which are provided in this order in the thickness direction; the diffusion surface layer 107, the diffusion particle layer 105, and the columnar microlenses 108 may have a single-layer structure or a multi-layer structure; that is, the diffusion surface layer 107, the diffusion particle layer 105, and the columnar microlens 108 may all have a single-layer structure, may all have a multilayer structure, or may partially have a single-layer structure or may partially have a multilayer structure.
As shown in fig. 9, the diffusion particle layer 105 includes a transparent resin layer 140 and diffusion particles 113 mixed in the transparent resin layer 140. The transparent resin layer 140 may be a thermosetting resin, a radiation-curable resin, or a reaction-curable resin, and the transparent resin layer 140 may be selected according to actual production requirements. The material, the number and the proportion of the diffusion particles 113 are not limited, and specific materials can be selected according to the requirements of actual viewing fields and screen display brightness uniformity, and the specific number proportion is set. Specifically, the material of the diffusion particles 113 is not limited, and may be a metal material or a non-metal material, and in actual production, the refractive index of the diffusion particles 113 may be as different as possible from the refractive index of the transparent resin layer 140 so as to diffuse the projection light beam entering the transparent resin layer 140.
As an alternative, the manner of mixing the diffusion particles 113 in the transparent resin layer 140 is not limited, and may be specifically set according to the requirements of the actual viewing field and the brightness uniformity of the screen display. The setting mode includes but is not limited to: the diffusion particles 113 are mixed with a liquid resin, and then the mixture is coated on the diffusion particle layer 105.
In this embodiment, the distribution manner of the diffusion particles 113 in the transparent resin layer 140 is not limited, and for example, the diffusion particles 113 may be distributed in the transparent resin layer 140 in an ordered manner, or may be arranged in the transparent resin layer 140 in a disordered and disordered manner. In order to have better imaging display effect and enable the projection light beam to be better diffused, the diffusion particles 113 are orderly arranged in the transparent resin layer 140 according to a multi-layer array.
It is understood that the diffusion particles 113 may be in any shape, for example, spheres or polyhedrons, and specifically, the diffusion particles 113 may be oval spheres, spheres or polyhedrons with certain edges and corners.
As shown in fig. 10, the dot-shaped lens layer 106 is provided with dot-shaped lenses 114 on at least one plane perpendicular to the thickness direction, and the dot-shaped lenses 114 are uniformly distributed on the plane perpendicular to the thickness direction of the dot-shaped lens layer 106 to achieve the effects of uniformly diffusing the projection beam and better imaging. The dot lens layer 106 may have a single-layer structure or a multi-layer structure. The arrangement of the multi-layer structure of the dot-shaped lens layer 106 can provide a more uniform diffusion effect for the projection light beam.
As shown in fig. 11, the diffusion surface layer 107 has a non-smooth surface 115 on one side perpendicular to the thickness direction, and the projection light beam can be diffused on the non-smooth surface 115 when entering the diffusion surface layer 107. The diffusion surface layer 107 may have a single-layer structure or a multi-layer structure. The arrangement of the multi-layer structure of the diffusion surface layer 107 can provide more sufficient diffusion effect for the projection light beam to obtain more uniform brightness display.
It is understood that the diffusion surface layer 107 can be directly applied or transferred to the surface of the optical structure layer 101 as the imaging element layer 103; the diffusion surface layer 107 may be combined with at least one of a diffusion particle layer 105 composed of a transparent resin layer 140 and diffusion particles 113, a dot lens layer 106, and a columnar microlens layer 108 to form an image forming element layer 103, and the diffusion surface layer 107 may be applied or transferred to the surface of the optical structure layer 101.
Particularly, the non-smooth surface 115 may be a surface with a rugged structure, and the specific shape, number and distribution of the rugged structure may be set according to the actual application requirement. For example: the non-smooth surface 115 may be formed of an irregular concave-convex shape, may be formed of a regular concave-convex shape, or may be formed of a combination of an irregular concave-convex shape and a regular concave-convex shape; the uneven structure in the non-smoothness 115 may be several tens, several hundreds, or several thousands; the non-smooth portions 112 may be arranged orderly according to a certain rule, may be arranged randomly according to a certain rule, may be arranged orderly according to a certain rule, and may be arranged randomly according to a certain rule. In order to improve the diffusion capability of the diffusion surface layer 107 to the projection light beam, the non-smooth surface 115 may be randomly arranged.
As shown in fig. 12, the lenticular lens layer 108 is formed by a plurality of linear lenticular lenses 116 arranged in rows, and the cross section of the lenticular lens layer 108 in the thickness direction is a plurality of circular, elliptical, parabolic, arcuate, or polygonal shapes arranged in rows. The lenticular microlens layer 108 may have a single-layer structure or a multi-layer structure. The linear lenticular microlenses 116 of the same layer of the lenticular layer 108 have the same shape and arrangement. When the lenticular microlens layers 108 have a multi-layer structure, the arrangement of the shapes of the lenticular microlens layers 108 may be the same for each layer, that is, the lenticular microlens layers 108 are the same for each layer, and the lenticular microlens layers 108 are stacked in the same direction for each layer; it is also possible that the second layer of the lenticular microlens layer 108 is rotated 90 ° along the plane and then laminated with the first layer of the lenticular microlens layer 108; the third layer of the lenticular microlens layer 108 has the same discharge direction as the first layer of the lenticular microlens layer 108, and is laminated with the second layer of the lenticular microlens layer 108; the fourth layer of the pillar-shaped microlens layer 108 is arranged in the same direction as the second layer of the pillar-shaped microlens layer 108, and is laminated with the second layer of the pillar-shaped microlens layer 108 in sequence according to the rule.
Specifically, the lenticular microlens layer 108 may be directly coated or transferred onto the surface of the optical structure layer 101, or may be combined with at least one of other structures such as the diffusion particle layer 105, the dot lens layer 106, or the diffusion surface layer 107 to form the imaging element layer 103, and the imaging element layer 103 is coated or transferred onto the surface of the optical structure layer 101.
As shown in fig. 13, a schematic cross-sectional view of an optical structure layer, where the optical structure layer 101 is composed of a plurality of linear triangular optical structures 112 arranged in rows, and a cross-section of the optical structure layer 101 in a thickness direction is a plurality of triangles arranged in rows, and the triangles may be isosceles triangles or non-isosceles triangles, where a vertex angle of the linear triangular optical structure 112 is 70 ° to 110 °, and a purpose of adjusting reflection of a projection beam toward a viewing area can be achieved by controlling a vertex angle of the linear triangular optical structure 112 to be 70 ° to 110 °.
Alternatively, a rough surface 150 may be formed on the plane formed by the two sides of the linear triangular optical structure 112 by a micro-structure processing technique to perform appropriate diffuse reflection on the projection beam and prevent the projection beam from being directionally reflected.
As shown in fig. 14, a schematic view of the projection screen according to the embodiment of the present invention reflecting ambient light is provided. The ambient light F is incident from above the projection screen 20, and the projection screen 20 is composed of a reflection layer 102, an optical structure layer 101, an imaging element layer 103, and a circular fresnel lens layer 100, which are sequentially arranged in the thickness direction. The ambient light F enters the circular fresnel lens layer 100, is refracted on the circular fresnel lens layer 100, enters the imaging element layer 103, the optical structure layer 101, and the reflection layer 102 after being refracted, is finally reflected by the reflection layer 102, and exits from the lower side of the projection screen 20 to the outside of the viewing area, so that a light E2 outside the viewing area is obtained. In the incident and reflection process, the ambient light F is lost or far away from the viewing area after being refracted and reflected for many times, and the image display of the projection screen 20 is hardly affected by the ambient light F through the matching of the circular fresnel lens layer 100 and the optical structure layer 101, so that the image display contrast of the projection screen is effectively improved.
Fig. 15 is a schematic diagram of a projection system according to an embodiment of the present invention. The projection system 10 comprises a projection device T and a projection screen 20 for performing imaging display based on a projection light beam E output by the projection device T, wherein the projection screen 20 comprises a reflection layer 102, an optical structure layer 101, an imaging element layer 103 and a circular fresnel lens layer 100 which are sequentially arranged along the thickness direction, the circular fresnel lens layer is composed of a plurality of circular fresnel lens structures with circle centers at the same point, the optical structure layer 101 is composed of a plurality of linear triangular optical structures 112 which are mutually arranged in a row, the cross section of the optical structure layer along the thickness direction is in a sawtooth shape, and the vertex angle of the linear triangular optical structure far away from the imaging element layer is 70-110 degrees. The projection light beam E is refracted by the circular Fresnel lens layer 100, diffused and imaged by the imaging element layer 103, and the transmission direction of the light beam is controlled based on the optical structure layer 101 and the reflection layer 102, so that the projection light beam E is reduced from being reflected to the outside of a view field which can be watched by a viewer G, the display brightness and the light energy utilization rate of the projection screen are effectively improved, the viewing angle controllability of the projection screen can be enhanced, and the reflection of the incident projection light beam by the surface of the projection screen is effectively reduced; through circular fresnel lens structure collocation linear triangle optical structure, can reflect the ambient light of screen top outside watching the visual field along the approximate vertical decurrent direction to reduce ambient light to the interference of projection light, realize promoting the purpose of projection screen contrast.
After the projection light beam E emitted by the projection device T enters the circular fresnel lens layer 100, the projection light beam E is refracted to enter the imaging element layer 103 inside the projection screen, so that the projection light beam E incident on the projection screen 20 at various angles can be adjusted in transmission direction by the circular fresnel lens structure. The trend of light beams is controlled by adjusting the tooth profile parameters of the circular Fresnel lens structure and matching the linear triangular optical structure, so that incident light beams can be prevented from being reflected outside a viewing area, more projection light beams are enabled to be refracted inside the projection screen for displaying, the brightness and the light energy utilization rate of the projection screen are improved, ambient light can be prevented from being emitted into the viewing area, and the effect of adjusting the brightness uniformity of all parts of the projection screen is achieved.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A projection screen is characterized by comprising a circular Fresnel lens layer, an imaging element layer, an optical structure layer and a reflecting layer which are sequentially arranged along the thickness direction; the circular Fresnel lens layer is composed of a plurality of circular Fresnel lens structures with the circle centers at the same point; the optical structure layer is composed of a plurality of linear triangular optical structures which are mutually arranged in a row, the cross section of the optical structure layer along the thickness direction is in a sawtooth shape, and the vertex angle of the linear triangular optical structure far away from the imaging element layer is 70-110 degrees.
2. The projection screen of claim 1, further comprising a scratch resistant layer disposed on a side of the circular fresnel lens layer away from the imaging element layer.
3. The projection screen of claim 1 wherein the circular fresnel lens layer is serrated in cross-section in the thickness direction.
4. The projection screen of claim 1 wherein the imaging element layer comprises at least one of a diffusing particle layer, a spot lens layer, a diffusing surface layer, and a lenticular layer.
5. The projection screen of claim 4 wherein the diffusing particle layer comprises a transparent resin layer mixed with diffusing particles that are spheres or polyhedrons.
6. The projection screen of claim 4 wherein the spot lens layers are not less than one layer, each layer of the spot lens layers having a spot lens disposed on at least one side perpendicular to the thickness direction.
7. The projection screen of claim 4 wherein the diffusion surface layer is not less than one layer, each of the diffusion surface layers having at least one non-smooth surface perpendicular to the thickness direction.
8. The projection screen of claim 4 wherein the lenticular layer is not less than one layer, each layer of lenticular layer comprises a plurality of rows of linear lenticular lenticules, and the cross-section of each layer of lenticular lenticules in the thickness direction is a plurality of circular, elliptical, parabolic, arcuate, or polygonal shapes.
9. The projection screen of claim 1 wherein the reflective layer is disposed on the optical structure layer by at least one of electroplating or vacuum plating or printing or spray coating or coating transfer.
10. A projection system is characterized by comprising a projection device and a projection screen for performing imaging display based on a projection light beam output by the projection device, wherein the projection screen comprises a circular Fresnel lens layer, an imaging element layer, an optical structure layer and a reflecting layer which are sequentially arranged in the thickness direction; the circular Fresnel lens layer is composed of a plurality of circular Fresnel lens structures with the circle centers at the same point; the optical structure layer is composed of a plurality of linear triangular optical structures which are mutually arranged in a row, the cross section of the optical structure layer along the thickness direction is in a sawtooth shape, and the vertex angle of the linear triangular optical structure far away from the imaging element layer is 70-110 degrees.
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| CN112255878A (en) * | 2020-11-10 | 2021-01-22 | 成都菲斯特科技有限公司 | Catadioptric lateral 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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