CN111123636A - Rear projection screen and projection system - Google Patents

Abstract

The invention provides a rear projection screen and a projection system, and relates to the technical field of optical projection. The rear projection screen comprises an imaging layer, an optical structure layer and a nano-scale fine structure layer which are sequentially arranged along the thickness direction; the surface of one side, away from the optical structure layer, of the nanoscale fine structure layer is provided with a plurality of nanoscale fine structures, and each nanoscale fine structure is a concave structure or a convex structure; the cross section of the optical structure layer in the thickness direction is a plurality of rows of mutually arranged triangles, one side of each triangle is arranged on the surface of the imaging layer, and the optical structure layer is laminated with the nano-scale fine structure layer through a bonding layer; the adhesive layer fills up the optical structure layer in a thickness direction. The projection system comprises the rear projection screen and the projection device. The rear projection screen and the projection system provided by the invention have the advantages of high brightness, high light energy utilization rate, high image definition, good environment light resistance and high contrast.

Description

Rear projection screen and projection system

Technical Field

The invention relates to the technical field of optical projection, in particular to a rear 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. The projection screen is composed of a series of fine structures, so that the light intensity of the projection light beam and the light intensity of the ambient light can be redistributed in the screen structure, and the projection screen has the main functions of imaging the projection light beam emitted by the projection device to audiences, effectively shielding the ambient light and enhancing the light intensity projected by the projection device. In the present day that projection display technology is mature and projection device technology is more and more homogeneous, a projection screen is used as a carrier of pictures, and the visual experience of audiences is determined by the performance of the projection screen.

According to different projection modes, the projection screen is divided into a front projection screen and a back projection screen, wherein the front projection screen is formed by positioning the audience and the projection device at the same side of the projection screen, and the back projection screen is formed by positioning the audience and the projection device at two sides of the projection screen. As shown in fig. 1, a schematic diagram of an optical path of a conventional rear projection system; the existing rear projection screen comprises an imaging layer 100 and an optical structure layer 107 which are arranged in a laminated manner, and a projection device T and a viewer G are respectively positioned at two sides of the rear projection screen; wherein, the viewer G is located at the side of the imaging layer 100 of the rear projection screen far away from the optical structure layer 107, and the projection device T is located at the side of the optical structure layer 107 of the rear projection screen far away from the imaging layer 100; the projection device T emits a projection beam E, which is written on the optical structure layer 107, and is partially reflected to the outside of the viewing area to obtain a light ray E1 outside the viewing area, and partially refracted by the optical structure layer 107 to enter the imaging layer 100 to enter the viewing area to obtain a light ray E inside the viewing area₂. Obtaining the light E outside the viewing area in the whole optical path transmission process₁The back projection screen can not form effective energy distribution, which causes great energy loss of the projection beam E, the brightness of the back projection screen is low, the brightness uniformity, the viewing angle and the image contrast of the back projection screen are greatly limited, and the energy consumption of the projection system is increased.

Disclosure of Invention

In view of the above, an object of the present invention is to provide a rear projection screen and a projection system, so as to solve the problems of low brightness uniformity, low image contrast, severe surface reflection, low light energy utilization rate and high energy consumption of the projection system of the conventional rear projection screen and the conventional projection system when the projection light beam is not vertically incident.

In order to achieve the above purpose, the embodiment of the invention adopts the following technical scheme:

a rear projection screen comprises an imaging layer, an optical structure layer and a nano-scale fine structure layer which are sequentially arranged along the thickness direction;

the surface of one side, away from the optical structure layer, of the nanoscale fine structure layer is provided with a plurality of nanoscale fine structures, and each nanoscale fine structure is a concave structure or a convex structure;

the cross section of the optical structure layer in the thickness direction is a plurality of rows of mutually arranged triangles, one side of each triangle is arranged on the surface of the imaging layer, and the optical structure layer is laminated with the nano-scale fine structure layer through a bonding layer; the adhesive layer fills up the optical structure layer in a thickness direction.

In a preferred alternative of the embodiment of the present invention, in the rear projection screen, the linearity of the nano-scale fine structure is 20nm to 350nm, and the center distance between any adjacent nano-scale fine structures is 20nm to 700 nm.

In a preferred option of the embodiment of the present invention, in the rear projection screen, a distance between any adjacent nano-scale fine structures is at least one of 100nm, 150nm, 200nm and 250 nm.

In a preferred option of the embodiment of the present invention, in the rear projection screen, the nano-scale fine structure is a concave structure, the concave structure is at least one of a cylinder, a cone, a truncated pyramid, a pyramid, and a partial or parabolic shape of a sphere, and a size of a bottom of a concave surface of the concave structure is smaller than or equal to a size of a surface of the concave surface.

In a preferred option of the embodiment of the present invention, in the rear projection screen, the nano-scale fine structure is a convex structure, the convex structure is at least one of a cylinder, a cone, a truncated pyramid, a pyramid, and a partial or parabolic shape of a sphere, and a bottom size of a convex surface of the convex structure is greater than or equal to a surface size of the convex surface.

In a preferred option of the embodiment of the present invention, in the rear projection screen, the nano-scale fine structure is fabricated on a surface of the nano-scale fine structure layer by at least one of a material removal processing method, a mold coating transfer printing, an anodic oxidation method, and a photolithography method.

In a preferred option of the embodiment of the present invention, in the rear projection screen, the imaging layer includes at least one of a diffusion particle layer, a point lens layer, a diffusion surface layer, and a cylindrical microlens layer.

In a preferred option of the embodiment of the present invention, in the rear projection screen, the diffusion particle layer includes a transparent substrate layer and a transparent resin layer, the transparent resin layer is 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 rear projection screen, the optical structure layer includes at least one of a linear fresnel lens structure, a circular fresnel lens structure, a linear grating structure and an arc grating structure.

A projection system comprises a projection device and the rear projection screen for imaging display based on the projection light beam output by the projection device; the projection device is arranged on one side of the nano-scale fine structure layer of the rear projection screen; the rear projection screen comprises an imaging layer, an optical structure layer and a nano-scale fine structure layer which are sequentially arranged along the thickness direction; the surface of one side, away from the optical structure layer, of the nanoscale fine structure layer is provided with a plurality of nanoscale fine structures, and each nanoscale fine structure is a concave structure or a convex structure; the cross section of the optical structure layer in the thickness direction is a plurality of rows of mutually arranged triangles, one side of each triangle is arranged on the surface of the imaging layer, and the optical structure layer is laminated with the nano-scale fine structure layer through a bonding layer; the adhesive layer fills up the optical structure layer in a thickness direction.

The rear projection screen provided by the embodiment of the invention is provided with the nanoscale fine structure layer, the imaging layer and the optical structure layer, so that projection beams are uniformly diffused and imaged on the imaging layer, and the brightness uniformity and the image definition of the rear projection screen are effectively improved; the nano-scale fine structure layer and the optical structure layer can effectively control the transmission direction of the projection light beam, effectively control the viewing angle, weaken the reflection of the rear projection screen and improve the optical utilization rate of the rear projection screen. The projection system formed by the rear 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 optical path diagram of a prior art rear projection system;

FIG. 2 is a schematic diagram of a rear projection screen according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of various parameters of nanoscale microstructures of different shapes provided by an embodiment of the present invention;

fig. 4 is a first schematic view of a nano-scale fine structure layer provided in an embodiment of the present invention;

fig. 5 is a second schematic view of a nano-scale fine structure layer provided by an embodiment of the present invention;

fig. 6 is a third schematic view of a nano-scale fine structure layer provided by an embodiment of the present invention;

fig. 7 is a fourth schematic view of a nano-scale fine structure layer provided by the embodiment of the present invention;

fig. 8 is a fifth schematic view of a nano-scale fine structure layer provided by an embodiment of the present invention;

fig. 9 is a sixth schematic view of a nano-scale fine structure layer provided in the embodiment of the present invention;

fig. 10 is a first position distribution diagram of the nano-scale fine structure provided by the embodiment of the present invention;

fig. 11 is a second location distribution diagram of the nano-scale fine structure provided by the embodiment of the present invention;

fig. 12 is a third position distribution diagram of the nano-scale fine structure provided by the embodiment of the present invention;

fig. 13 is a fourth location distribution diagram of the nano-scale fine structure provided by the embodiment of the present invention;

FIG. 14 is a schematic structural diagram of an imaging layer provided by an embodiment of the invention;

FIG. 15 is a schematic structural diagram of a diffusion particle layer provided by an embodiment of the present invention;

fig. 16 is a schematic view of a first structure of a dot lens layer according to an embodiment of the present invention;

fig. 17 is a schematic structural diagram of a second dot lens layer provided in the embodiment of the present invention;

FIG. 18 is a schematic view of a first structure of a diffusion surface layer provided in accordance with an embodiment of the present invention;

FIG. 19 is a schematic diagram of a second structure of a diffusion surface layer provided in accordance with an embodiment of the present invention;

FIG. 20 is a schematic diagram of a first structure of a lenticular microlens layer according to an embodiment of the present invention;

FIG. 21 is a schematic diagram of a second structure of a lenticular microlens layer according to an embodiment of the present invention;

FIG. 22 is a schematic diagram of a third structure of a lenticular microlens layer according to an embodiment of the present invention;

FIG. 23 is a schematic diagram of a first structure of an optical structure layer provided in an embodiment of the invention;

FIG. 24 is a schematic diagram of a second structure of an optical structure layer provided in an embodiment of the invention;

FIG. 25 is a schematic diagram of a third structure of an optical structure layer provided in an embodiment of the invention;

FIG. 26 is a diagram illustrating a fourth structure of an optical structure layer according to an embodiment of the present invention;

fig. 27 is a schematic optical path diagram of a projection system according to an embodiment of the present invention.

Icon: 10-rear projection screen; 20-a projection system; 100-an imaging layer; 101-a diffusion particle layer; 102-a diffusion surface layer; 103-a lenticular layer; 104-a spot lens layer; 105-a tie layer; 106-nanoscale fine structure layer; 107-optical structure layer; 111-diffusion particles; 112-non-smooth face; 113-linear cylindrical microlenses; 114-point lens; 115-nanoscale microstructures; 116-a linear fresnel lens structure; 117-circular fresnel lens structure; 118-a line grating structure; 119-arc grating structure; 120-a transparent substrate layer; 140-a transparent resin layer; e-projecting the light beam; e1-light outside the viewing area; e2-light in the viewing area; g-audience; a T-projection device; d-linear degree; p-spacing distance; a-enlarged partial view.

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 "one side" and the like are used only for distinguishing the description, and are not to be construed as merely or implying relative importance.

In the description of the present invention, the terms "stacked" and "disposed" are to be construed broadly unless otherwise expressly specified or limited. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Example one

As shown in fig. 2, an embodiment of the present invention provides a projection screen 10, including an imaging layer 100, an optical structure layer 107, and a nano-scale fine structure layer 106, which are sequentially arranged in a thickness direction; the surface of the nano-scale fine structure layer 106 on the side away from the optical structure layer 107 is provided with a plurality of nano-scale fine structures 115, the cross section of the optical structure layer 107 in the thickness direction is a plurality of rows of triangles arranged mutually, one side of each triangle is arranged on the surface of the imaging layer 100, and the optical structure layer 107 is laminated with the nano-scale fine structure layer 106 through a bonding layer 105; the adhesive layer 105 fills up the optical structure layer 107 in the thickness direction.

Alternatively, the nano-scale fine structure 115 may be at least one of a cylinder, a cone, a truncated pyramid, and a partial or parabolic shape of a sphere. As shown in fig. 3, the nano-sized fine structure 115 may have a convex structure or a concave structure; the spherical surface can be a cylinder, a prism, a prismoid, a truncated cone, a sphere part, or a combination of a cylinder and a sphere part. The nano-scale fine structures 115 on the surface of the nano-scale fine structure layer 106 may be uniformly distributed or irregularly distributed. The nano-scale fine structures 115 disposed on the surface of the nano-fine structure layer 106 may be the same or may not be completely the same.

Alternatively, the degree of linearity d of the nano-scale fine structure 115 is set to 20nm to 350nm, and the center distance p between any adjacent nano-scale fine structures 115 is set to 20nm to 700 nm. The linearity herein, as a general understanding, intuitively refers to the size of the object, and particularly to the maximum long width of the object as measured from various directions.

In a preferred embodiment, the nano-scale fine structure 115 is provided with a linearity d of 45nm, 65nm, or 100nm in a direction parallel to the nano-scale fine structure layer 106.

As a preferable mode, the center distance p between any adjacent nano-scale fine structures 115 may be at least one of 100nm, 150nm, 200nm, and 250nm, that is: the center distance p of any adjacent nano-scale fine structures 115 may be set to 100 nm; the center distance p of any adjacent nano-scale fine structures 115 may be set to 150 nm; the center distance p between any adjacent nano-scale fine structures 115 may be set to 200 nm; the center distance p between any adjacent nano-scale fine structures 115 may be set to 250 nm; the distance p between the centers of any adjacent nano-scale fine structures 115 may be partially 100nm and the remaining part may be 150 nm; the distance p between the centers of any adjacent nano-scale fine structures 115 may be partially 100nm and the remaining part may be 200 nm; the distance p between the centers of any adjacent nano-scale fine structures 115 may be partially 100nm and the remainder 250 nm; the distance p between the centers of any adjacent nano-scale fine structures 115 may be partially 150nm and the remaining part may be 200 nm; the distance p between the centers of any adjacent nano-scale fine structures 115 may be partially 150nm and the remainder 250 nm; the distance p between the centers of any adjacent nano-scale fine structures 115 may be set to 200nm in part and 250nm in the remainder; the center distance p between any adjacent nano-scale fine structures 115 may be partially 100nm, partially 150nm, and the balance 200 nm; the center distance p between any adjacent nano-scale fine structures 115 may be partially 100nm, partially 150nm, and the balance 250 nm; the center distance p between any adjacent nano-scale fine structures 115 may be partially 100nm, partially 200nm, and the balance 250 nm; the center distance p between any adjacent nano-scale fine structures 115 may be set to be partially 150nm, partially 200nm, and the balance 250 nm; the center distance p between any adjacent nano-scale fine structures 115 may be partially 100nm, partially 150nm, partially 200nm, and the balance 250 nm.

Fig. 4 to 9 are six schematic views of the nano-scale fine structure layer according to the embodiment of the present invention; a plurality of nano-scale fine structures 115 are disposed on a surface of one side of the nano-scale fine structure layer 106, and the nano-scale fine structures 115 are uniformly distributed on the nano-scale fine structure layer 106. As shown in fig. 4, the nano-scale fine structure 115 is a convex structure and is a cylinder; as shown in fig. 5, the nano-scale fine structure 115 is a convex structure and is a prismoid; as shown in fig. 6, the nano-scale fine structure 115 is a convex structure and is a truncated cone; as shown in fig. 7, the nano-scale fine structure 115 is a convex structure and is a prism; as shown in fig. 8, the nano-scale fine structure 115 is a convex structure and is a prismoid; as shown in fig. 9, the nano-scale fine structure 115 is a concave structure and is a part of a sphere.

As a preferable mode, when the nano-scale minute structure 115 is a concave structure, the size of the bottom of the concave surface of the concave structure is defined to be not more than the size of the surface of the concave surface; when the nano-scale fine structure 115 is a convex structure, the size of the bottom of the convex surface of the convex structure is not less than the size of the surface of the convex surface.

Alternatively, the nano-scale fine structure 115 may be fabricated on the surface of the nano-scale fine structure layer 106 by a material removal process, or may be fabricated on the surface of the nano-scale fine structure layer 106 by a mold coating and transfer method, or may be fabricated on the surface of the nano-scale fine structure layer 106 by an anodic oxidation method, or may be fabricated on the surface of the nano-scale fine structure layer 106 by a photolithography method; the nano-scale fine structure layer 106 may be fabricated on the surface thereof by any combination of the above methods.

Alternatively, the nano-scale fine structure 115 may be regularly arranged or irregularly arranged on the surface of the nano-scale fine structure layer 106. As shown in fig. 10, the nano-scale fine optical structure 115 exhibits an elliptical arrangement on the nano-scale fine-structure layer 106; as shown in fig. 11, the nano-scale fine optical structure 115 exhibits a parabolic arrangement on the nano-scale fine structure layer 106; as shown in fig. 12, the nano-scale fine optical structure 115 presents a circular arrangement of several concentric circles on the nano-scale fine structure layer 106, and the center of the concentric circles is located on the nano-scale fine structure layer 106; as shown in fig. 13, the nano-scale fine optical structure 115 presents a circular arrangement of several concentric circles on the nano-scale fine structure layer 106, the centers of the concentric circles not being on the nano-scale fine structure layer 106.

Alternatively, the imaging layer 100 includes at least one of a diffusion particle layer 101, a dot lens layer 104, a diffusion surface layer 102, and a lenticular microlens layer 103. That is, the imaging layer 100 may be any one of the diffusing particle layer 101, the dot lens layer 104, the diffusing surface layer 102, and the lenticular microlens layer 103; any two of the diffusion particles 101, the dot lens layers 104, the diffusion surface layers 102, and the columnar microlens layers 103 may be stacked; any three of the diffusion particle layer 101, the dot lens layer 104, the diffusion surface layer 102, and the pillar microlens layer 103 may be laminated without limiting the positional relationship; the diffusion particle layer 101, the dot lens layer 103, the diffusion surface layer 102, and the pillar microlens layer 103 may be laminated, and the positional relationship between the layers is not limited.

In particular, the imaging layer 100 may also be uniformly added with pigment or toner, or a colored layer may be separately provided in the imaging layer 100, and the position of the colored layer may be adjusted as required, and the colored layer may be located between the structures of the imaging layer 100 or outside the structures of the imaging layer 100; the light with corresponding wavelength can be selectively absorbed, and the effect of improving the contrast of the projection screen is further realized.

Alternatively, as shown in fig. 14, the imaging layer 100 is formed by laminating a diffusion surface layer 102, a diffusion particle layer 101, and a lenticular microlens layer 103, which are sequentially arranged in the thickness direction; the diffusion surface layer 102, the diffusion particle layer 101, and the lenticular layer 103 may be of a single-layer structure or a multi-layer structure; that is, the diffusion surface layer 102, the diffusion particle layer 101, and the lenticular lens layer 103 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. 15, the diffusion particle layer 101 preferably includes a transparent base material layer 120 and a transparent resin layer 140, and the diffusion particles 111 are mixed in the transparent resin layer 140. The specific type of the transparent substrate layer 120 is not limited, and may be set according to the actual application requirements, for example, the transparent substrate layer may be a flexible structure, or may be a structure with certain rigidity; the flexible structure may include, but is not limited to, flexible transparent plastic or rubber film such as polyethylene, polyvinyl chloride, chlorinated polypropylene, biaxial polypropylene, polycarbonate, polyethylene, polymethyl methacrylate, polycarbonate, polyamide (nylon), thermoplastic polyurethane resin, etc., and the structure having a certain rigidity may include, but is not limited to, a transparent substrate such as glass, acryl, ceramic, etc. In addition, the transmittance of the transparent substrate layer 120 to visible light is not limited, and may be set according to the actual application requirements. In this embodiment, in order to ensure the best imaging display, the light transmittance of the transparent substrate layer 120 is selected to be not less than 75%. 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.

As an optional way, the material, the number, and the proportion of the diffusion particles 111 are not limited, and a specific material may be selected and a specific number proportion may be set according to the requirements of the actual viewing field and the uniformity of the screen display brightness. Specifically, the material of the diffusion particles 111 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 111 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 111 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 111 are mixed with a liquid resin, and then the mixture is coated on the diffusion particle layer 101.

In this embodiment, the distribution manner of the diffusion particles 111 in the transparent resin layer 140 is not limited, and for example, the diffusion particles 111 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 111 are orderly arranged in the transparent resin layer 140 according to a multilayer array.

It is understood that the diffusion particles 111 may be in any shape, for example, spheres or polyhedrons, and specifically, the diffusion particles 111 may be elliptical spheres, spheres or polyhedrons with certain edges.

Alternatively, as shown in fig. 16, a first structure diagram of the dot lens layer 104 is provided. The point-shaped lens layer 104 is a single layer, the point-shaped lens 114 is arranged on at least one plane of the point-shaped lens layer 104 perpendicular to the thickness direction, and the point-shaped lenses 114 are uniformly distributed on the plane of the point-shaped lens layer 104 perpendicular to the thickness direction, so that the projection light beams are uniformly diffused and the image is better formed.

Alternatively, as shown in fig. 17, a second structure diagram of the dot lens layer 104 is provided. The point-shaped lens layers 104 are arranged in a multilayer structure, each point-shaped lens layer 104 is provided with point-shaped lenses 114 on a plane perpendicular to the thickness direction, the point-shaped lenses 114 are uniformly distributed on the plane perpendicular to the thickness direction of the point-shaped lens layers 104, and the multilayer structure of the point-shaped lens layers 104 plays a role in more uniformly diffusing incident light.

As an alternative, as shown in fig. 18, a first structural diagram of the diffusion surface layer 102 is provided, the diffusion surface layer 102 is provided as a single layer, a non-smooth surface 112 is provided on one side of the diffusion surface layer 102 perpendicular to the thickness direction, and the projection light beam can be diffused on the non-smooth surface 112 when entering the diffusion surface layer 102.

Alternatively, as shown in fig. 19, a second structural diagram of the diffusion surface layer 102 is provided, the diffusion surface layer 102 is provided as a multi-layer structure, and one surface of each diffusion surface layer 102 perpendicular to the thickness direction is a non-smooth surface 112, so that the projection light beam entering the diffusion surface layer 102 is diffused more sufficiently, and a more uniform luminance display is obtained.

It is understood that the diffusion surface layer 102 can be directly applied or transferred on the surface of the optical structure layer 107 as the imaging layer 100, and sequentially stacked with the bonding layer 105 and the nanoscale fine structure layer 106 to form the rear projection screen 10; the diffusion surface layer 102 may be combined with at least one of the diffusion particle layer 101, the point lens layer 104, and the pillar microlens layer 103, which are formed by the transparent substrate layer 120 and the transparent resin layer 140, to form the imaging layer 100, and the diffusion surface layer 102 is coated or transferred onto the transparent substrate layer 120, and then is adhered to the optical structure layer 107.

Specifically, the non-smooth surface 112 may be a surface with a rugged structure, where 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 112 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 asperities in the non-smooth surface 112 can be tens, hundreds, or 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 102 to the projection light beam, the non-smooth surface 112 may be randomly arranged.

Alternatively, as shown in fig. 20, a first structural diagram of the pillar microlens layer 103 is provided, the pillar microlens layer 103 is a single-layer structure, the pillar microlens layer 103 is composed of a plurality of linear pillar microlenses 113 arranged in rows, and the cross section of the pillar microlens layer 103 in the thickness direction is a plurality of circles, ellipses, parabolas, arches, or polygons arranged in rows.

As an alternative, as shown in fig. 21, a second structural diagram of the pillar microlens layer 103 is provided, the pillar microlens layer 103 is a multilayer structure, the pillar microlens layer 103 is composed of a plurality of linear pillar microlenses 113 arranged in rows, and the cross section of the pillar microlens layer 103 in the thickness direction is a plurality of circles, ellipses, parabolas, arches, or polygons arranged in rows; the shape and arrangement of each layer of the lenticular microlens layers 103 are the same, that is, the lenticular microlens layers 103 of each layer are the same, and the lenticular microlens layers 103 of each layer are stacked in the same direction.

As an alternative, as shown in fig. 22, a third structure of the lenticular microlens layer 103 is provided, which is different from the second structure of the lenticular microlens layer 103 in fig. 22 in that: the second layer of the lenticular microlens layer 103 is rotated 90 ° along the plane and then laminated with the first layer of the lenticular microlens layer 103; the third layer of the lenticular microlens layer 103 is arranged in the same direction as the first layer of the lenticular microlens layer 103, and is laminated with the second layer of the lenticular microlens layer 103; the fourth layer of the lenticular microlens layer 103 is arranged in the same direction as the second layer of the lenticular microlens layer 103, and is laminated with the second layer of the lenticular microlens layer 103 in sequence according to the above rule.

Specifically, the lenticular microlens layer 103 may be directly coated or transferred on the side of the optical structure layer 107 away from the nano-scale fine structure layer 106, or may be bonded to at least one of the diffusion particle layer 101, the point lens layer 104, or the diffusion surface layer 102, and then the optical structure layer 107 is attached to the side far away from the nano-scale fine structure layer 106.

As an alternative, as shown in fig. 23, the optical structure layer 107 is a linear fresnel lens structure 116, and a cross section of the linear fresnel lens structure 116 in the thickness direction is a plurality of triangles arranged mutually and presenting a saw-tooth shape. The tooth form apex angles of the triangles may be all the same, may be partially the same, or may be all different. The fresnel lens structure 116 is an asymmetric structure, and the boundary of the asymmetric arrangement may be within the geometric dimension of the linear fresnel lens structure 116 or outside the geometric dimension. As a preferable mode, the vertex angle of the triangular tooth shape of the linear fresnel lens structure 116 may be set to be a right angle, and the hypotenuse of the right triangle is used to adjust the transmission direction of the projection light beam.

As an alternative, as shown in fig. 24, the optical structure layer 107 is a circular fresnel lens structure 117, the circular fresnel lens structure 117 is composed of a plurality of circular prisms, and the centers of the circular prisms are located at the same point, i.e., arranged in concentric circles; the circular fresnel lens structure 117 has a saw-toothed shape in cross section in the thickness direction. In a preferred embodiment, the cross-section of the circular fresnel lens structure 117 along the thickness direction has a sawtooth angle of 90 °, and the hypotenuse of the right angle is used to adjust the transmission direction of the projection light beam.

Alternatively, as shown in fig. 25, the optical structure layer 107 is a line grating structure 118, the line grating structure 118 is a prism arranged in a linear array in a direction parallel to the imaging layer, the cross-sectional shape of the prism is a non-right triangle, and two short sides of the non-right triangle function to adjust the transmission direction of the projection beam.

Alternatively, as shown in fig. 26, the optical structure layer 107 is an arc-shaped grating structure 119, the arc-shaped grating structure is an arc-shaped prism, the cross-sectional shape of the prism in the thickness direction is a non-right triangle, and two short sides of the non-right triangle play a role in adjusting the transmission direction of the projection beam.

As a preferable mode, the optical structure layer 107 may be made by combining at least two of a linear fresnel lens structure 116, a circular fresnel lens structure 117, a linear grating structure 118 and an arc grating structure 119, so as to achieve a better projection light beam control effect and obtain a better image display effect.

The rear projection screen provided by the embodiment of the invention is provided with the nanoscale fine structure layer, the imaging layer and the optical structure layer, so that projection beams are uniformly diffused and imaged on the imaging layer, and the brightness uniformity and the image definition of the rear projection screen are effectively improved; the nano-scale fine structure layer and the optical structure layer can effectively control the transmission direction of the projection light beam, effectively control the viewing angle, weaken the reflection of the rear projection screen and improve the optical utilization rate of the rear projection screen.

Example 2

As shown in fig. 27, a projection system 20 includes a projection device T and the rear projection screen of embodiment 1 that performs image display based on a projection light beam E output by the projection device T, the projection device T is disposed on one side of a nano-scale fine structure 115 of a nano-scale fine structure layer 106 of the rear projection screen, the rear projection screen includes an imaging layer 100, an optical structure layer 107 and a nano-scale system structure layer 106 sequentially disposed along a thickness direction, a surface of one side of the nano-scale fine structure layer 106 away from the imaging layer 100 is provided with a plurality of nano-scale fine structures 115, and the nano-scale fine structures 115 are concave structures or convex structures; the cross section of the optical structure layer 107 in the thickness direction is a triangle with a plurality of rows and a plurality of rows arranged mutually, one side of the triangle is arranged on the surface of the imaging layer 100, and the optical structure layer 107 is laminated with the nanoscale fine structure layer 106 through an adhesive layer 105; the adhesive layer 105 fills up the optical structure layer 107 in the thickness direction.

The projection device T outputs a projection light beam E, which sequentially passes through the nanoscale fine structure layer 106, the adhesive layer 105, the optical structure layer 107, and the imaging layer 100, and then exits into a viewing area to obtain a light ray E2 in the viewing area, and enters the viewing range of the audience G.

The projection system formed by the rear 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.

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 rear projection screen is characterized by comprising an imaging layer (100), an optical structure layer (107) and a nano-scale fine structure layer (106) which are sequentially arranged along the thickness direction;

the surface of one side, away from the optical structure layer (107), of the nanoscale fine structure layer (106) is provided with a plurality of nanoscale fine structures (115), and the nanoscale fine structures (115) are concave structures or convex structures;

the cross section of the optical structure layer (107) in the thickness direction is a plurality of rows of triangles arranged mutually, one side of each triangle is arranged on the surface of the imaging layer (100), and the optical structure layer (107) is laminated with the nanoscale fine structure layer (106) through an adhesive layer (105); the adhesive layer (105) fills up the optical structure layer (107) in the thickness direction.

2. A rear projection screen according to claim 1, characterized in that the nanometric scale (d) of the micrometric structure (115) is comprised between 20nm and 350nm and the distance (p) between the centres of any adjacent nanometric micrometric structures (115) is comprised between 20nm and 700 nm.

3. A rear projection screen according to claim 2, characterized in that the distance (p) between the centers of any adjacent nanoscale microstructures (115) is at least one of 100nm or 150nm or 200nm or 250 nm.

4. A rear projection screen according to claim 1, characterized in that the nano-scale micro-texture (115) is a concave texture of at least one of a cylinder, a cone, a truncated pyramid, a part of a sphere or a paraboloid shape, the concave texture having a concave bottom dimension ≤ a concave surface dimension.

5. The rear projection screen of claim 1, wherein the nano-scale fine structure (115) is a convex structure, the convex structure is at least one of a cylinder, a cone, a truncated pyramid, a part of a sphere or a paraboloid, and the convex bottom dimension of the convex structure is greater than or equal to the convex surface dimension.

6. The rear projection screen of claim 1, wherein the nano-scale fine structure (115) is fabricated on the surface of the nano-scale fine structure layer (106) by at least one of material removal processing, mold coating transfer, anodization, or photolithography.

7. A rear projection screen according to claim 1, characterized in that the imaging layer (100) comprises at least one of a diffusing particle layer (101), a dot lens layer (104), a diffusing surface layer (102) and a lenticular layer (103).

8. A rear projection screen according to claim 7, wherein the diffusing particle layer (101) comprises a transparent substrate layer (120) and a transparent resin layer (140), the transparent resin layer (140) having diffusing particles (111) mixed therein, the diffusing particles (111) being spheres or polyhedrons.

9. A rear projection screen according to claim 1, wherein the optical structure layer (107) comprises at least one of a linear fresnel lens structure (116), a circular fresnel lens structure (117), a line grating structure (118) and an arc grating structure (119).

10. A projection system comprising a projection device (T) and a rear projection screen (10) according to any one of claims 1 to 9 for image-wise display on the basis of a projection beam (E) output by the projection device (T);

the projection device (T) is arranged on one side of the nano-scale fine structure (115) of the nano-scale fine structure layer (106) of the rear projection screen;

the rear projection screen comprises an imaging layer (100), an optical structure layer (107) and a nano-scale fine structure layer (106) which are sequentially arranged along the thickness direction;

the surface of one side, away from the optical structure layer (107), of the nanoscale fine structure layer (106) is provided with a plurality of nanoscale fine structures (115), and the nanoscale fine structures (115) are concave structures or convex structures;

the cross section of the optical structure layer (107) in the thickness direction is a plurality of rows of triangles arranged mutually, one side of each triangle is arranged on the surface of the imaging layer (100), and the optical structure layer (107) is laminated with the nanoscale fine structure layer (106) through an adhesive layer (105); the adhesive layer (105) fills up the optical structure layer (107) in the thickness direction.

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