CN215729261U

CN215729261U - Projection curtain

Info

Publication number: CN215729261U
Application number: CN202120127465.9U
Authority: CN
Inventors: 周小红; 朱鸣; 浦东林; 朱鹏飞; 朱昊枢; 孙如斌; 陈林森
Original assignee: Ivtouch Co ltd; Weiyeda Technology Jiangsu Co ltd; SVG Tech Group Co Ltd
Current assignee: Suzhou Weiyeda Technology Co ltd; Weiyeda Technology Jiangsu Co ltd; SVG Tech Group Co Ltd
Priority date: 2021-01-18
Filing date: 2021-01-18
Publication date: 2022-02-01
Anticipated expiration: 2031-01-18

Abstract

The utility model provides a projection curtain. The projection curtain at least comprises one of a coloring layer, a diffusion layer and a Fresnel lens layer and a reflecting layer; the Fresnel lens layer is a spherical Fresnel lens layer or an aspheric Fresnel lens layer, the Fresnel lens layer comprises a plurality of annular bulges which are protruded along a plane, the annular bulges are arranged in an annular zone, the section of each annular bulge is triangular or multi-step shape or free surface shape along the section perpendicular to the plane, the width of the side of each section parallel to the plane is gradually changed, and the section shape and the width of the section are gradually changed to determine the light condensation characteristic of the spherical Fresnel lens layer or the aspheric Fresnel lens layer; each annular bulge surface is provided with a scattering microstructure, the reflecting layer is a metal layer or a metal alloy layer and is prepared by adopting an electroplating process, an evaporation process, a sputtering process or a coating process. The projection curtain provided by the utility model has higher brightness and larger visual angle than the existing projection curtain.

Description

Projection curtain

Technical Field

The utility model relates to the technical field of display, in particular to a projection curtain.

Background

With the development of various display technologies, people pay more and more attention as a projection display technology capable of realizing an ultra-large display screen. In addition to requiring a high-quality projector, the projection display technology is an essential key component for achieving or exceeding the mainstream liquid crystal display technology or organic display technology in the market in terms of image display effect, and a high-quality optical projection screen is also required.

An optical projection screen is a projection screen that consists of a series of microscopic optical structures that allow the projector and ambient light intensities to be redistributed among the screen structures. The projector has the characteristics that the projector can effectively weaken the ambient light intensity and enhance the light intensity projected by the projector, improve the picture contrast, the brightness gain, the color reducibility, the resolution ratio and the like, and meet the requirements of people on ultrahigh image quality. The Fresnel screen is a common optical projection screen, and the Fresnel screen adopts a Fresnel lens structure principle, collimates light beams incident at a certain angle to form parallel light, and finally sends the parallel light to human eyes for imaging. How to further enhance the ambient light interference resistance of the fresnel screen and further improve the screen brightness and contrast is always a goal pursued by engineers and researchers.

In addition, the common preparation method of the Fresnel lens in the Fresnel screen at present is a diamond turning method. The micro-structure of the Fresnel lens manufactured by the processing method is low in refinement degree, and the groove width of the Fresnel lens is usually 20-50 um. The microstructure with the low degree of refinement is not beneficial to improving the light efficiency utilization rate. Meanwhile, the microstructure with high refinement degree is not beneficial to the processing of the Fresnel lens. How to reduce the processing difficulty of the Fresnel lens under the condition of ensuring that the light efficiency utilization rate is not changed or even improved is also a target constantly pursued by engineers and researchers.

In addition, optical projection screens currently on the market, such as those manufactured by japan printing corporation (DNP) and kyfield technologies ltd, are hard screens made of thick rigid back plates supported by accessories such as decorative frames and hanging members. The optical projection screen in the hard screen form is heavy in weight, large in size, incapable of being curled, not only not beneficial to carrying, but also occupies a large amount of space.

SUMMERY OF THE UTILITY MODEL

To address the above problems or some of the problems.

The utility model provides a Fresnel lens, which comprises a plurality of annular bulges protruding along a plane, wherein the annular bulges are arranged in a ring band and are arranged along a section perpendicular to the plane, the section of each annular bulge is triangular, the side of the triangle parallel to the plane is called a first side, and the other two sides are called a second side and a third side; wherein, the height H of the first side of each triangle is the same, and the included angle alpha 1 between the third side of each triangle and the first side is 90 degrees.

The utility model provides another Fresnel lens which comprises a plurality of annular bulges, wherein the annular bulges are arranged in an annular band and are arranged along a section perpendicular to a plane, the section of each annular bulge is in a multi-step shape, the side of the multi-step shape parallel to the plane is called a first side, the side with a step shape is called a second side, the side without the step shape is called a third side, the third side is perpendicular to the first side, and one of the two sides of each step is perpendicular to the first side, and the other side is parallel to the first side; the vertical distance from the side of the step farthest from the first side to the first side of each multi-step shape, which is parallel to the first side, is called the height H of the first side, and the height H of the first side of each multi-step shape is equal.

Optionally, the height H of the first side is:

from center to outside, the length Lj of the first side of the jth triangle or multi-step:

wherein, P is an integer larger than or equal to 1, lambda is the central wavelength, and f is the focal length of the Fresnel lens.

Optionally, the height H of the first side is 1-20 μm.

Optionally, an included angle β 1 between the second side and the first side of each triangle is 65-81 degrees.

Optionally, the length of the first edge is 0.02-0.3 mm.

Optionally, the surface of the annular protrusion has a scattering microstructure.

The utility model provides a FresnelThe Fresnel lens mold comprises a plurality of annular microstructure units which are raised along a plane, the annular microstructure units are arranged in annular zones, the cross section of each annular microstructure unit along the section perpendicular to the plane is triangular or multi-step-shaped, the side of the triangular or multi-step-shaped parallel to the plane is called a first side, the length L of the first side of the jth triangular or multi-step-shaped is counted from the center to the outside, and the length L of the first side of the jth triangular or multi-step-shaped is counted from the center to the outside_j:

Wherein P is an integer greater than or equal to 1, λ is the central wavelength, and f is the focal length of the Fresnel lens.

Similar to the definition of the height H of the first side of the triangle or the multi-step shape in examples 1 to 2, the height H of the first side of the triangle or the multi-step shape of the cross-sectional shape of the annular microstructure unit is:

wherein n is the refractive index of the Fresnel lens.

The utility model provides a projection curtain, which comprises a coloring layer, a diffusion layer, a Fresnel lens layer and a reflection layer which are sequentially stacked along the thickness direction; or,

the projection curtain includes diffusion layer, dyed layer, fresnel lens layer and the reflection stratum of range upon range of setting in proper order along thickness direction.

The utility model provides a projection curtain, which comprises a coloring layer, a Fresnel lens layer and a reflecting layer which are sequentially stacked along the thickness direction; wherein, diffusion particles are added into the Fresnel lens layer.

The utility model provides a projection curtain, which comprises a diffusion layer, a Fresnel lens layer and a reflection layer which are sequentially stacked along the thickness direction, wherein coloring particles are added into the Fresnel lens layer.

The utility model provides a projection curtain, which comprises a Fresnel lens layer and a reflecting layer which are sequentially stacked along the thickness direction; the base material layer of the Fresnel lens layer or the film with certain haze is added with coloring particles and diffusion particles, or the Fresnel lens is added with the coloring particles and the diffusion particles.

Optionally, the fresnel lens layer is disposed on a base material, wherein the base material is a high-transmittance resin material with a light transmittance of more than 75%, and the thickness of the fresnel lens layer is 10-200 μm.

Optionally, the fresnel lens layer and the substrate are integrally formed; or the Fresnel lens layer is attached to the base material through Optical Clear Adhesive (OCA).

Optionally, the fresnel lens layer is disposed on a film having a certain haze; wherein the haze value of the film is 50-90%, and the thickness is 50-200 μm.

Optionally, the fresnel lens layer is attached to a film with a certain haze through the OCA.

Optionally, the fresnel lens layer is a spherical fresnel lens layer or an aspheric fresnel lens layer.

Optionally, the thickness of the OCA is 10-200 μm.

Optionally, the thickness of the colored layer is 10-200 μm, and the light transmittance of the colored layer is 50-90%.

Optionally, the coloring layer is a nickel-plated layer, and the light transmittance of the coloring layer is 50-90%.

Alternatively, the diffusion layer is a light-transmitting resin mixed with diffusion particles.

Optionally, the thickness of the diffusion layer is 50-1000 μm.

Optionally, the diffusion layer is a micro-nano structure with a diffusion function, and the cross section of the diffusion layer is in the shape of one or a combination of two or more of an arc, a triangle, a square, a rectangle, a trapezoid or an irregular shape.

Optionally, the height of the micro-nano structure is 1-20 μm.

Optionally, the micro-nano structure is made of a flexible material.

Optionally, the diffusion layer is a semi-transparent semi-reflective film, the haze value of the diffusion layer is 50-90%, and the transmittance of the diffusion layer is 55-65%.

Optionally, the reflective layer is a metal reflective layer, or an alloy reflective layer.

Optionally, the metal reflective layer includes aluminum, silver, gold, chromium, nickel, and copper; the alloy reflecting layer comprises nickel-chromium alloy, aluminum alloy and titanium alloy.

Optionally, the reflective layer is an aluminum metal reflective layer and is prepared by a coating or spraying technology.

Optionally, when the aluminum metal reflection layer is prepared by a coating technology, the thickness of the aluminum metal reflection layer is 0.04-3 μm.

Optionally, the particle size of the aluminum particles is less than or equal to 500 nm.

Optionally, when the aluminum reflective coating is prepared by a spraying technology, the thickness of the aluminum metal reflective coating is 10-20 μm.

Optionally, the particle size of the aluminum particles is greater than 5 μm.

Optionally, the difference between the refractive index of the fresnel lens material and the refractive index of the diffusing particles is less than 0.4.

Optionally, the colored particles have a particle size of less than 200 μm.

Optionally, the diffusion particles have a particle size of 1-50 μm.

The utility model has the following advantages:

(1) the utility model provides a design of a Fresnel lens die which reduces the processing difficulty of a Fresnel lens under the condition of ensuring that the light efficiency utilization rate is not changed.

(2) The present invention provides a projection screen with higher brightness and larger viewing angle than existing projection screens.

Drawings

Fig. 1 is a schematic structural diagram of a fresnel lens according to a first embodiment of the present invention; fig. 1a is a top view, fig. 1b is a cross-sectional view, and fig. 1c is a cross-sectional view of a single microstructure unit.

Fig. 2 is a schematic structural diagram of a fresnel lens according to a second embodiment of the present invention; fig. 2a is a top view, fig. 2b is a cross-sectional view, and fig. 2c is a cross-sectional view of a single microstructure unit.

FIG. 3 is a geometric diagram of a third embodiment of a Fresnel lens design according to the present invention.

FIGS. 4a and 4b are three-dimensional model diagrams of a Fresnel lens-manufacturing mold according to a fourth embodiment of the present invention; fig. 4a is a perspective view of a tapered three-dimensional model, and fig. 4b is an axial cross section of the tapered shape.

Fig. 5a-5c are schematic views of a projection screen according to a sixth embodiment of the present invention.

Fig. 6 is a schematic view of a projection screen according to a seventh embodiment of the present invention.

Fig. 7 is a schematic view of a projection screen according to an eighth embodiment of the present invention.

Fig. 8 is a schematic view of a projection screen according to a ninth embodiment of the present invention.

Fig. 9 is a schematic view of a projection screen according to a tenth embodiment of the present invention.

FIG. 10 shows the test results of Fresnel lens surface with random spots and reflective layer prepared by coating process.

Detailed Description

Embodiments of the present application will be described in detail by examples, so that how to apply technical means to solve technical problems and achieve technical effects of the present application can be fully understood and implemented.

The raw materials and equipment used in the present application are all common raw materials and equipment in the field, and are all from commercially available products, unless otherwise specified. The methods used in this application are conventional in the art unless otherwise indicated.

Example 1

Fig. 1 is a schematic structural diagram of a first fresnel lens provided in the present invention; fig. 1a is a plan view and fig. 1b is a sectional view. As shown in fig. 1a-1b, the fresnel lens includes a plurality of annular protrusions protruding along a plane, the annular protrusions are arranged in annular zones, and along a cross section perpendicular to the plane, the cross section of each annular protrusion is triangular, the side of the triangle parallel to the plane is referred to as a first side a1, and the other two sides are referred to as a second side b1 and a third side c1, as shown in fig. 1 c; wherein the height H of the first side a1 of each triangle is the same. Meanwhile, in order to facilitate the preparation of the mold for the fresnel lens by the micro-nano lithography method described later, the included angle α 1 between the third side c1 and the first side a1 of each triangle is preferably 90 degrees. The width of the first side a1 of each triangular section is gradually changed, and the height of the first side a1 is unchanged, so that the triangular section is gradually changed, the shape of the section and the width of the section are gradually changed, and the light condensation characteristic of the spherical Fresnel lens layer or the aspheric Fresnel lens layer is determined.

The height H of the first side a1 of the triangle is:

wherein, P is an integer larger than or equal to 1, lambda is the central wavelength, and n is the refractive index of the Fresnel lens.

The length Lj, from the center outwards, of the first side a1 of the jth triangle is:

As an alternative embodiment, the included angle β 1 between the second side b1 and the first side a1 of each triangle is preferably 65-81 degrees, the height of the first side a1 is preferably 1-20 μm, and the length of the first side a1 is preferably 0.02-0.3 mm.

Example 2

FIG. 2 is a schematic structural diagram of a Fresnel lens provided by the present invention; fig. 2a is a plan view and fig. 2b is a sectional view. As shown in fig. 2a-2b, the fresnel lens includes a plurality of annular protrusions protruding along a plane, the plurality of annular protrusions are arranged in a ring-shaped manner, and along a cross section perpendicular to the plane, a cross-sectional shape of each annular protrusion is a multi-step shape, a side of the multi-step shape parallel to the plane is referred to as a first side a2, a side having a step shape is referred to as a second side b2, and a side having no step shape is referred to as a third side c2, as shown in fig. 2 c. In order to prepare the mold of the fresnel lens by using the micro-nano lithography method described later, the third side c2 is perpendicular to the first side a2, and of the two sides of each step, one side d1 is perpendicular to the first side a2, and the other side d2 is parallel to the first side a2, as shown in fig. 2 c. Meanwhile, the side d2 of the step farthest from the first side a2 in each multi-step shape parallel to the first side a2, the vertical distance to the first side a2 is referred to as the height H of the first side a2, and the height H of the first side a1 in each multi-step shape is the same. The first side a2 of each multi-step section has a gradually changing width and a constant height, so that the multi-step section is gradually changed, and the light-gathering characteristics of the spherical Fresnel lens layer or the aspheric Fresnel lens layer are determined by the shape of the section and the gradual change of the width.

The height H is:

Length Lj of the j-th multi-step first side a2, counted from the center to the outside:

As an alternative embodiment, the height of the first side a2 is preferably 1-20 μm, and the length of the first side a2 is preferably 0.02-0.3 mm.

In other embodiments of the present invention, the cross-sectional shape of the annular protrusion may also be a free surface. Specifically, the fresnel lens includes a plurality of annular protrusions protruding along a plane, the annular protrusions are arranged in an annular zone, and along a section perpendicular to the plane, the section of each annular protrusion is a free surface shape, an edge of the free surface shape parallel to the plane is called a first edge, an edge of the free surface shape which changes freely is called a second edge, and the other edge of the free surface shape is called a third edge; the perpendicular distance from the intersection point of the second edge and the third edge to the first edge is called the height H of the first edge, and the height H of the first edge of each free surface shape is equal. Meanwhile, in order to facilitate the preparation of the mold of the fresnel lens by the micro-nano lithography method described later, the included angle α 1 between each third side and the first side is preferably 90 degrees. The width of the first side a1 of each free-form section is gradually changed, and the height of the first side is unchanged, so that the free-form section is gradually changed, and the light condensation characteristics of the spherical Fresnel lens layer or the aspheric Fresnel lens layer are determined by the gradual change of the section shape and the width of the section shape.

Example 3

The utility model provides a design method of a Fresnel lens. The Fresnel lens comprises a plurality of annular protrusions protruding along a plane, the annular protrusions are arranged in annular zones, and along a section perpendicular to the plane, the section of each annular protrusion is in the shape of a triangle or a multi-step shape or a free surface shape, the side of the triangle or the multi-step shape or the free surface shape parallel to the plane is called a first side, and the length Lj of the first side of the jth triangle or the multi-step shape or the free surface shape is counted from the center:

As shown in fig. 3, the length Lj of the first side of the jth triangle or multi-step shape or free-form shape is obtained by the following steps:

step 1: assuming that the radius of the spherical lens is R and the refractive index of the lens material is n, the focal length f of the spherical lens is:

step 2: collapsing the curved surface of the lens, wherein the height H of each collapse is as follows:

the jth ring, collapsed j times;

and step 3: assuming that the radius of the jth zone is aj, according to the triangular relationship:

unfolding to obtain:

wherein

Small relative to 2R, and can be neglected to approximate, then the radius after approximation is expressed as:

and 4, step 4: length Lj of first side of jth triangle or multiple step shape or free surface shape:

as can be seen from the above formula 3-4 or 3-5, the period of the microstructure unit of the Fresnel lens mold with the structure is obviously enlarged by the magnification of

And (4) doubling. Therefore, the processing difficulty can be reduced to some extent.

Example 4

The utility model provides a method for preparing a Fresnel lens mould. The Fresnel lens mold comprises a plurality of annular microstructure units which are raised along a plane, the annular microstructure units are arranged in annular zones, the section of each annular microstructure unit along the section perpendicular to the plane is triangular or multi-step-shaped or free-form surface, the side of the triangular or multi-step-shaped or free-form surface parallel to the plane is called a first side, the number of the first sides is from the center to the outside, and the length L of the first side of the jth triangular or multi-step-shaped or free-form surface_j:

Similar to the definition of the height H of the first side of the triangular or multi-step shape or free surface shape in examples 1-2, the height H of the first side of the triangular or multi-step shape or free surface shape of the cross-sectional shape of the annular microstructure unit is:

wherein n is the refractive index of the Fresnel lens.

The preparation method of the Fresnel lens mould comprises the following steps:

step 1, providing a three-dimensional model diagram. Specifically, the three-dimensional model of the three-dimensional model map is preferably conical, as shown in fig. 4 a.

The radius R of the conical base circle is:

the included angle alpha between the length L of the conical generatrix and the bottom circle is as follows:

wherein:

p is an integer larger than or equal to 1, lambda is a central wavelength, N is the refractive index of the Fresnel lens material, f is the focal length of the Fresnel lens, and N is the total number of the annular microstructure units.

As an alternative embodiment, the three-dimensional model of the three-dimensional model map is preferably hemispherical. The radius R of the hemisphere base circle, i.e. the radius of the hemisphere, is:

Step 2: setting at least one curvature function f1(x), and determining the height of the midpoint of the three-dimensional model according to the curvature function f1 (x). Specifically, the curvature function f1(x) is preferably:

f₁(x)＝xtanα…………4-5

where the argument x refers to the distance from a point on a certain radius of the conical base circle to the end of the radius remote from the center of the base circle.

As an alternative embodiment, the curvature function f1(x) is preferably:

wherein,

the argument x refers to the distance from a point on a certain radius of the hemisphere base circle to the end of the radius remote from the center of the hemisphere base circle.

And step 3: and dividing the three-dimensional model diagram in the height direction to obtain a plurality of height sections. Specifically, the cone is divided into N parts by a plane parallel to the bottom surface of the cone, as shown in fig. 4 b. The length delta Lj +1 of a truncated cone generatrix of the j +1 th section counted from the top of the cone is as follows:

as an alternative embodiment, the hemisphere is divided into N equal parts by a plane parallel to the base circle of the hemisphere. Length of each portion:

and 4, step 4: and projecting the three-dimensional model image on a plane to obtain a gray level image. The gray level image comprises a plurality of pixel points, and each pixel point comprises the position of the pixel point and a gray level value; the projection of the three-dimensional model map on the horizontal plane includes a plurality of points, each point including a location, and a height value. And the position of each point corresponds to the position of a pixel point in the gray scale image, and each height interval of the three-dimensional model image corresponds to a gray scale value range. For example, the grayscale range is 0 to 64, or 0 to 256. According to the height range of the height interval in which the height value of the three-dimensional model graph is located and a corresponding function f2(x) of the gray value range, the gray value corresponding to the height value is obtained through calculation, and the gray value of the corresponding pixel point of the gray map is obtained. Specifically, the function f2(x) corresponding to the gray value in the gray value range and the height value in the height range of the j +1 th interval is preferably:

as an optional embodiment, the function f2(x) corresponding to the gray value in the gray value range and the height value in the height range of the j +1 th interval is preferably:

wherein, the gray scale value range is more than or equal to 0 and less than or equal to Qmax. Where Qmax is the maximum gray value in the range of gray values, and the argument x refers to the height value in the height range.

And 5: and coating photoresist on the target carrier, and carrying out photoetching according to the gray-scale image to obtain a patterned structure. The gradation pattern may be divided into a plurality of unit patterns and then subjected to photolithography, and a ramp may be formed on the target carrier by exposure and development according to a corresponding function f3(x) of gradation value and photolithography time. The higher the gray value of the pixel point of the gray image is, the longer the photoetching time is, the deeper photoetching can be carried out, and the lower the gray value of the pixel point of the gray image is, the shorter the photoetching time is, the shallower photoetching can be carried out. Specifically, the lithography time and gray value correspondence function f3(x) is preferably:

wherein η is the photoetching rate, i.e. the photoetching depth per unit time; the argument x refers to the gray value.

As an alternative embodiment, the lithography time is not changed when the gray value takes a certain range. Namely:

f₃(x)＝f₃(x₂)…………4-13

wherein,

x₁≤x＜x₂

as an alternative to the above-described embodiment,

wherein M is the number of steps, and i is an integer having a value of 0 or more and less than M.

Step 6: the patterned structure is transferred to another carrier by means of UV transfer or metal growth, forming a mold complementary to the pattern of the fresnel lens.

Compared with the prior art, the method for preparing the fresnel lens mold of the embodiment includes the steps of obtaining a gray scale image by projecting the three-dimensional model image on a plane, dividing the three-dimensional model image into a plurality of height intervals according to height, wherein the height range of each height interval corresponds to a gray scale value range, and easily converting the three-dimensional model image into the gray scale image, so that the fresnel lens mold is easily manufactured.

Example 5

The utility model provides a preparation method of a Fresnel lens mold. The preparation method of the Fresnel lens mould comprises the following steps:

step 1: providing a three-dimensional model map.

Step 2: setting at least one curvature function, and determining the height of the midpoint of the three-dimensional model according to the curvature function.

And step 3: and dividing the three-dimensional model diagram in the height direction to obtain a plurality of height sections.

And 4, step 4: and projecting the three-dimensional model image on a plane to obtain a gray level image.

The specific procedures of steps 1 to 4 are the same as those of steps 1 to 4 of example 4, and will not be described again.

And 5: and sampling a plurality of sets of binary images according to the gray level images. In particular to a method for preparing a high-performance nano-silver alloy,

sampling M-1 sets of binary images according to the number M of steps;

assigning the pixel points with the gray values in the first range as black (or white), and assigning the pixel points with the gray values in other ranges as white (or black) to obtain a first set of second-value images;

assigning the pixel points with the gray values in the second range as black (or white), and assigning the pixel points with the gray values in other ranges as white (or black) to obtain a second set of second value image;

assigning the pixel points with the gray values in the kth range as black (or white), and assigning the pixel points with the gray values in other ranges as white (or black) to obtain a kth set of binary image;

wherein, the kth range section at least partially covers the kth-1 range section, M is an integer greater than or equal to 2, black represents 1 in the binary values, and white represents 0 in the binary values.

Step 6: and coating photoresist on the target carrier, performing superposition lithography based on the sets of binary images, and forming a multi-step patterned structure on the target carrier through exposure and development.

As a preferred embodiment, the object carrier is baked after overlay lithography to obtain a smooth patterned structure.

And 7: the patterned structure is transferred to another carrier by means of UV transfer or metal growth, forming a mold complementary to the pattern of the fresnel lens.

In this embodiment, a plurality of sets of binary images are used for performing overlay lithography to prepare the fresnel lens mold. Therefore, the problems of long time consumption and low efficiency of the Fresnel lens mould prepared by the gray scale photoetching method can be effectively solved.

Example 6

The utility model provides a projection curtain, as shown in fig. 5a-5b, the projection curtain comprises a coloring layer, a diffusion layer, a Fresnel lens layer and a reflecting layer which are sequentially stacked along the thickness direction. The Fresnel lens layer is a spherical Fresnel lens layer or an aspheric Fresnel lens layer.

As an alternative embodiment, as shown in fig. 5c, the projection curtain includes a diffusion layer, a colored layer, a fresnel lens layer, and a reflective layer, which are sequentially stacked in the thickness direction.

As an alternative embodiment, the projection curtain includes a diffusion layer, a fresnel lens layer, a colored layer, and a reflective layer, which are sequentially stacked in the thickness direction. Wherein, the dyed layer sets up a plurality of cyclic annular convex surfaces on fresnel lens layer, and the reflection stratum sets up the surface at the dyed layer.

The colored layer has functions of absorbing ambient light incident on the projection screen, reducing black brightness of an image, improving contrast of the image, and the like. The colored layer is usually formed by uniformly mixing a colorant with a high-transmittance resin having a light transmittance of more than 75%, and then subjecting the mixture to injection molding, extrusion, drawing, heat curing, or the like. As the colorant, dark dyes, pigments, and the like such as gray-based dyes, black-based dyes, and the like; for example, carbon black, graphite, metal salts such as black iron oxide, and the like. Examples of the resin having high light transmittance include PET (polyethylene terephthalate) resin, PC (polycarbonate) resin, MS (methyl methacrylate styrene) resin, MBS (methyl methacrylate butadiene styrene) resin, TAC (triethylcellulose) resin, PEN (polyethylene naphthalate) resin, and acrylic resin. The thickness of the colored layer is preferably 10 to 200 μm, and the light transmittance thereof is preferably 50 to 90%.

As an optional embodiment, the coloring layer is a nickel plating layer, and the light transmittance of the coloring layer is preferably 50-90%.

The diffusion layer is used for enlarging the visual angle and increasing the uniformity of the brightness in the screen surface. The diffusion layer may be a film in which diffusion particles having a function of diffusing light are uniformly mixed in a resin having light transmittance, as shown in fig. 5 a. Wherein, in order to enlarge the visual angle and increase the surface uniformity of the brightness, the difference between the refractive index of the resin and the refractive index of the diffusion particles is less than 0.4. As the resin, for example, a PET (polyethylene terephthalate) resin, a PC (polycarbonate) resin, an MS (methyl methacrylate styrene) resin, an MBS (methyl methacrylate butadiene styrene) resin, a TAC (triethylene cellulose) resin, a PEN (polyethylene naphthalate) resin, an acrylic resin, or the like is preferably used. The diffusion particles can be inorganic diffusion particles and/or organic diffusion particles, and the inorganic diffusion particles are particles formed by one or more materials of aluminum oxide, antimony oxide, cadmium oxide, tantalum oxide, zirconium oxide, iron oxide, copper oxide, lead oxide, manganese oxide, tin oxide, tungsten oxide, zinc selenide, niobium oxide, zinc telluride, vanadium oxide, molybdenum oxide, zinc sulfide, zinc oxide, cadmium sulfide, cadmium selenide, titanium oxide and lead sulfide; the organic diffusion particles may be selected from particles formed of one or more materials of polystyrene, acrylic resin, polyurethane, polytetrafluoroethylene, melamine resin, benzoguanamine resin, epoxy resin, or silicone resin. The particle diameter of the diffusion particles is 1 to 50 μm, preferably 5 to 30 μm. The thickness of the diffusion layer is 50 to 1000 μm, preferably 188 μm.

As an optional embodiment, as shown in fig. 5b, the diffusion layer is a micro-nano structure with a diffusion function, the height of the micro-nano structure is 1 to 20 μm, and the cross section of the micro-nano structure is one or a combination of two or more of an arc shape, a triangle shape, a square shape, a rectangle shape, a trapezoid shape and an irregular shape. For the purpose of the projection screen having flexibility and being able to be curled, the micro-nano structure is preferably made of a flexible material, such as resin.

As an optional embodiment, the diffusion layer can be a semi-transparent semi-reflective film, and the haze value is preferably 50-90%, and the transmittance is preferably 55-65%.

The reflecting layer can be a metal reflecting layer or an alloy reflecting layer. 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.

In a preferred embodiment, the reflective layer is preferably an aluminum metal reflective layer, and is formed by electroplating or spray coating. When the aluminum alloy is prepared by adopting an electroplating technology, the thickness of the aluminum alloy is preferably 0.04-3 mu m, and the particle size of aluminum particles is preferably within 500 nm; when the coating is prepared by adopting a spraying technology, the thickness of the coating is less than 10-20 mu m, and the particle size is more than 5 mu m.

The Fresnel lens layer plays a role in adjusting the transmission direction of the projection light beam. The fresnel lens layer is the fresnel lens described in embodiments 1-2.

As an alternative embodiment, in order to provide the projection screen with greater brightness (i.e. gain) and greater viewing angle (i.e. half viewing angle), the convex surface of the fresnel lens layer has a scattered point microstructure, as shown in fig. 5 c.

As an alternative embodiment, the fresnel lens layer is disposed on the substrate. The base material is preferably a high-transmittance resin material having a light transmittance of more than 75%, and the thickness thereof is preferably 10 to 200 μm.

As an alternative embodiment, the fresnel lens layer may be formed integrally with the substrate.

As an optional embodiment, the Fresnel lens layer can be adhered to the substrate through an Optically Clear Adhesive (OCA), and the thickness of the optically clear adhesive is preferably 10-200 μm.

As an alternative embodiment, the fresnel lens layer is disposed on a film having a certain haze. Wherein the haze value of the film is preferably 50 to 90%, and the thickness is preferably 50 to 200 μm.

As an optional embodiment, the Fresnel lens layer is attached to a film or plate with certain haze through an OCA, and the thickness of the OCA is preferably 10-200 μm.

The utility model also provides a preparation method of the projection curtain.

The diffusion layer, the coloring layer and the Fresnel lens layer are sequentially bonded through the OCA; or the coloring layer, the diffusion layer and the Fresnel lens layer are sequentially bonded through the OCA; wherein the thickness of the OCA is 10 to 200 μm.

As an optional embodiment, the diffusion layer and the colored layer are sequentially prepared in a coating manner, and then are attached to the fresnel lens layer through the OCA; or the coloring layer and the diffusion layer are sequentially prepared in a coating mode and then are attached to the Fresnel lens layer through the OCA; wherein the thickness of the OCA is 10-200 μm.

As an alternative embodiment, the fresnel lens layer is made using a roll-to-roll process. Specifically, firstly, a glue layer is coated on a base material, a film with certain haze, a diffusion layer or a coloring layer; then, a roll-to-roll imprinting process is adopted on the adhesive layer by using the Fresnel lens mould described in the embodiment 4-5, and a Fresnel lens layer is formed by imprinting; and finally drying and curing.

As an alternative implementation manner, in order to make the projection curtain have stronger brightness (i.e. gain) and larger viewing angle (i.e. half viewing angle), when the fresnel lens mold of examples 4-5 is manufactured, the surface of the fresnel lens mold has a random dot structure prepared by using a laser direct writing process, and then the mold is used to stamp and form the fresnel lens layer, so that the surface of the annular protrusion of the fresnel lens layer has a scattered dot microstructure.

As an alternative embodiment, the coloring layer is plated on one surface of the diffusion layer, and then the other surface of the diffusion layer is attached to the fresnel lens layer through the OCA; or the coloring layer is plated on one surface of the diffusion layer, and then one surface of the coloring layer, which is far away from the diffusion layer, is attached to the Fresnel lens layer through the OCA; wherein the thickness of the OCA is 10-200 μm.

And after the Fresnel lens layer is well adhered, preparing a reflecting layer on the surface of the Fresnel lens layer.

As a preferred embodiment, the reflective layer is prepared on the surface of the fresnel lens layer before it is attached.

As an alternative embodiment, the above-mentioned attaching uses a roll-to-roll process.

Example 7

The utility model provides a projection curtain, as shown in fig. 6, the projection curtain comprises a coloring layer, a Fresnel lens layer and a reflecting layer which are sequentially stacked along the thickness direction. The Fresnel lens layer is a spherical Fresnel lens layer or an aspheric Fresnel lens layer.

The colored layer and the reflective layer are as described in example 6, and will not be described again here. The method of fabricating the fresnel lens layer is as described in example 6, and no further description is given here, except that the diffusing particles are added to the adhesive layer used to fabricate the fresnel lens layer. The difference between the refractive index of the material of the Fresnel lens layer and the refractive index of the diffusing particles is less than 0.4. The diffusion particles may be those of the inorganic or organic material described in example 5, and will not be described herein.

The projection curtain of the embodiment has the advantages that on one hand, the diffusion layer is omitted, so that the projection curtain becomes thinner and softer, and the curling is facilitated; on the other hand, the Fresnel lens layer is added with the diffusion particles, so that the view angle of an image projected on the projection screen is larger, and the surface uniformity of the brightness is better.

The utility model also provides a projection curtain preparation method.

The coloring layer and the Fresnel lens layer are sequentially bonded through the OCA; wherein the thickness of the OCA is 10-200 μm.

As an alternative embodiment, the reflective layer is prepared on the surface of the fresnel lens layer before it is attached.

Example 8

The utility model provides a projection curtain, as shown in fig. 7, the projection curtain comprises a diffusion layer, a Fresnel lens layer and a reflection layer which are sequentially stacked along the thickness direction. The Fresnel lens layer is a spherical Fresnel lens layer or an aspheric Fresnel lens layer.

The diffusion layer and the reflective layer are as described in example 6, and will not be described in detail here. The method of fabricating the fresnel lens layer is as described in example 6, and no further description is given here, except that colored particles are added to the glue layer used to fabricate the fresnel lens layer. The colored particle material is preferably a dark-colored dye such as a gray-colored dye or a black-colored dye or a pigment; for example, carbon black, graphite, metal salts such as black iron oxide, and the like. The particle diameter of the colored particles is preferably less than 200 μm.

The projection curtain of the embodiment reduces the coloring layer, so that the projection curtain becomes thinner and softer, and is more beneficial to curling; on the other hand, the Fresnel lens layer is added with the coloring particles, so that the black brightness of the image caused by ambient light is obviously reduced, and the contrast of the image is greatly improved.

The utility model also provides a projection curtain preparation method.

The diffusion layer and the Fresnel lens layer are sequentially bonded through the OCA; wherein the thickness of the OCA is 10-200 μm.

And after the Fresnel lens layer is laminated, preparing a reflecting layer on the surface of the Fresnel lens.

Example 9

The utility model provides a projection curtain, as shown in fig. 8, the projection curtain comprises a Fresnel lens layer and a reflecting layer which are sequentially stacked along the thickness direction. The Fresnel lens layer is a spherical Fresnel lens layer or an aspheric Fresnel lens layer.

The reflective layer is as described in example 6 and will not be described again here. The method for producing the fresnel lens layer is as described in example 6, and no description is given here, except that colored particles and diffusing particles are added to the base material layer of the fresnel lens layer or the film having a certain haze. As the material of the colored particles, dark dyes, pigments, and the like such as gray-based and black-based dyes; for example, carbon black, graphite, metal salts such as black iron oxide, and the like. The diffusion particles may be selected from inorganic diffusion particles and/or organic diffusion particles, and the material thereof is as described in example 6, and will not be described again here. The colored particles have a particle diameter of less than 200 μm. The particle size of the diffusion particles is 1 to 50 μm, preferably 5 to 30 μm. The thickness of the substrate layer is preferably 50 to 200 μm.

The projection curtain of the embodiment reduces the coloring layer and the diffusion layer, so that the projection curtain becomes thinner and softer, and is more beneficial to curling; on the other hand, the projection curtain prepared in the way not only obviously reduces the black brightness of the image caused by ambient light and greatly improves the contrast of the image, but also can expand the viewing angle of the image projected on the projection curtain and greatly improve the surface uniformity of the brightness.

Example 10

The utility model provides a projection curtain, as shown in fig. 9, the projection curtain comprises a Fresnel lens layer and a reflecting layer which are sequentially stacked along the thickness direction. The Fresnel lens layer is a spherical Fresnel lens layer or an aspheric Fresnel lens layer.

The reflective layer is as described in example 6 and will not be described again here. The method of fabricating the fresnel lens layer is as described in example 6, and no further description is made herein, except that the coloring particles and the diffusing particles are added to the adhesive layer used to fabricate the fresnel lens layer. The diffusing particles and coloring particles are as described in example 9, and will not be described again here.

The inventors have discovered unintentionally that when the fresnel lens layer in examples 5 to 10 is embossed using the fresnel lens mold shown in examples 4 to 5, and the surface of the fresnel lens mold shown in examples 4 to 5 has a random dot structure prepared by a laser direct writing process, the reflective layer uses a coating (e.g., electroplating, evaporation, or sputtering) process, which exhibits higher brightness (i.e., gain) and a larger viewing angle (i.e., half viewing angle) than the existing projection screen. The fresnel lens layer of the existing projection curtain is embossed by using the fresnel lens mold described in embodiments 4 to 5, but the surface of the fresnel lens mold does not have a random dot structure prepared by a laser direct writing process, and the reflective layer adopts an aluminum spraying process. The experimental data are shown in fig. 10. The reason for this is not detailed and is under further investigation.

There are many other possible embodiments of the present invention, which are not listed here, and the embodiments claimed in the claims of the present invention can be implemented.

The details not described in the specification of the present application belong to the common general knowledge of those skilled in the art.

In the following description and in the claims, the terms "include" and "comprise" are used in an open-ended fashion, and thus should be interpreted to mean "include, but not limited to. "substantially" means within an acceptable error range, and a person skilled in the art can solve the technical problem within a certain error range to substantially achieve the technical effect.

It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a good or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such good or system. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in a commodity or system that includes the element.

The foregoing description shows and describes several preferred embodiments of the present application, but as aforementioned, it is to be understood that the application is not limited to the forms disclosed herein, but is not to be construed as excluding other embodiments and is capable of use in various other combinations, modifications, and environments and is capable of changes within the scope of the inventive concept as expressed herein, commensurate with the above teachings, or the skill or knowledge of the relevant art. And that modifications and variations may be effected by those skilled in the art without departing from the spirit and scope of the application, which is to be protected by the claims appended hereto.

Claims

1. A projection curtain is characterized by comprising a coloring layer, a diffusion layer, a Fresnel lens layer and a reflecting layer which are sequentially stacked along the thickness direction; or the projection curtain comprises a diffusion layer, a coloring layer, a Fresnel lens layer and a reflecting layer which are sequentially stacked along the thickness direction; the Fresnel lens layer comprises a plurality of annular bulges protruding along a plane, the annular bulges are arranged in annular zones, and the cross section of each annular bulge along the section perpendicular to the plane is in a multi-step shape or a free surface shape.

2. A projection curtain is characterized by comprising a coloring layer, a diffusion layer, a Fresnel lens layer and a reflecting layer which are sequentially stacked along the thickness direction; or the projection curtain comprises a diffusion layer, a coloring layer, a Fresnel lens layer and a reflecting layer which are sequentially stacked along the thickness direction; the Fresnel lens layer comprises a plurality of annular bulges protruding along a plane, the annular bulges are arranged in an annular band and are perpendicular to the section of the plane, the section of each annular bulge is triangular, and the surface of each annular bulge of the Fresnel lens layer is provided with a scattering point microstructure.

3. A projection curtain is characterized by comprising a coloring layer, a Fresnel lens layer and a reflecting layer which are sequentially stacked along the thickness direction; the Fresnel lens layer comprises a plurality of annular bulges protruding along a plane, the annular bulges are arranged in annular zones, and the cross section of each annular bulge along the plane is triangular or multi-step-shaped or free-form; diffusing particles are added to the annular protrusions of the Fresnel lens layer.

4. A projection curtain is characterized by comprising a diffusion layer, a Fresnel lens layer and a reflection layer which are sequentially stacked in the thickness direction; the Fresnel lens layer comprises a plurality of annular bulges protruding along a plane, the annular bulges are arranged in annular zones, and the cross section of each annular bulge along the plane is triangular or multi-step-shaped or free-form; colored particles are added to the annular protrusions of the Fresnel lens layer.

5. The projection curtain of any of claims 1-4, wherein the Fresnel lens layer further comprises a substrate layer disposed on the bottom of the plurality of annular protrusions, or a film layer having a haze.

6. A projection curtain is characterized by comprising a Fresnel lens layer and a reflecting layer which are sequentially stacked in the thickness direction, wherein the Fresnel lens layer comprises a plurality of annular protrusions protruding along a plane, the annular protrusions are arranged in annular zones, and the cross section of each annular protrusion along the section perpendicular to the plane is in a multi-step shape or a free surface shape; the base material layer at the bottom of the Fresnel lens layer, or the film with a certain haze at the bottom, is added with coloring particles and diffusing particles, or the annular protrusions are added with coloring particles and diffusing particles.

7. A projection curtain is characterized by comprising a Fresnel lens layer and a reflecting layer which are sequentially stacked along the thickness direction, wherein the Fresnel lens layer comprises a plurality of annular bulges which protrude along a plane, the annular bulges are arranged in annular zones, and the cross section of each annular bulge is triangular along the cross section perpendicular to the plane; the base material layer at the bottom of the Fresnel lens layer, or the film with certain haze at the bottom is added with coloring particles and diffusion particles, or the annular bulges are added with coloring particles and diffusion particles, and the surface of the annular bulges of the Fresnel lens layer is provided with a scattered point microstructure.

8. The projection curtain of any of claims 1, 3, 4, or 6, wherein the surface of the annular ridge of the Fresnel lens layer has a scatter microstructure.

9. The projection curtain of claim 8, wherein the reflective layer is a metallic reflective layer, or an alloy reflective layer; the metal reflecting layer comprises aluminum, silver, gold, chromium, nickel and copper; the alloy reflecting layer comprises nickel-chromium alloy, aluminum alloy and titanium alloy.

10. The projection curtain of claim 9, wherein the reflective layer is fabricated using an electroplating, evaporation, sputtering, or coating process.