Projection screen and projection system

Abstract

The application provides a projection screen, comprising a substrate layer and a microstructure layer, wherein the substrate layer comprises a light-incident surface and a back surface; and the microstructure layer comprises a plurality of groups of triangular pyramid periodic structures, the plurality of groups of triangular pyramid periodic structures are convexly arranged on the light-incident surface or the back surface of the substrate layer along a first direction, each group of the triangular pyramid periodic structures is an array, each group of the triangular pyramid periodic structures comprises a plurality of groups of triangular pyramid units arranged along a second direction; each group of the triangular pyramid units comprises adjacent triangular pyramid units, the adjacent triangular pyramid units are in a rotationally symmetric structure; and the first direction and the second direction are at a certain angle. The application also provides a projection system.

Description

[0001] The present application is a divisional application, and its parent application is an application with the application number CN202210024544.6 and the application date of January 6, 2022, and the title of the application is “Projection screen and projection system”. TECHNICAL FIELD

[0002] The present application relates to the field of optical technology, in particular to a projection screen and a projection system. BACKGROUND

[0003] With the rapid growth of the household and portable direct projection market, the application of direct projection projectors is also becoming more and more widespread. However, due to the limitations of size and price, the luminous flux of direct projection projectors is low, resulting in low brightness when directly projected on the wall. However, a high-gain anti-environmental light screen can significantly improve the display brightness with very little cost, which is far less than the cost of selecting a larger luminous flux projector. Therefore, developing a projection screen with high brightness and high brightness uniformity can greatly improve the experience of using projectors for the audience, and the screen is suitable for all brands of direct projection products and can be quickly applied to the huge direct projection market.

[0004] The mainstream direct projection screen used by the current market direct projection projector adopts a white plastic screen and a glass bead screen, which is not resistant to environmental light. In the presence of environmental light, the display effect is prone to whitening, the color saturation is low, and the brightness uniformity of the screen is not good. SUMMARY

[0005] The purpose of the embodiments of the present application is to provide a projection screen and a projection system to solve the above problems. The embodiments of the present application achieve the above-mentioned purpose through the following technical solutions.

[0006] In a first aspect, the present application provides a projection screen, comprising a substrate layer and a microstructure layer, the microstructure layer comprising a plurality of groups of triangular pyramid periodic structures, the plurality of groups of triangular pyramid periodic structures being arranged on the substrate layer along a first direction, each group of triangular pyramid periodic structures comprising a plurality of groups of triangular pyramid units arranged along a second direction, the second direction being different from the first direction, each group of triangular pyramid units comprising an adjacent first triangular pyramid unit and a second triangular pyramid unit, the first triangular pyramid unit and the second triangular pyramid unit being arranged in rotational symmetry, the top of the first triangular pyramid unit and the top of the second triangular pyramid unit being oriented in the same direction, each first triangular pyramid unit comprising a first transmission bottom surface and three first reflection side surfaces connected to the first transmission bottom surface, each second triangular pyramid unit comprising a second transmission bottom surface and three second reflection side surfaces connected to the second transmission bottom surface, the first transmission bottom surface and the second transmission bottom surface being arranged on the substrate layer, the first transmission bottom surface and the second transmission bottom surface being arranged in central symmetry, the plurality of groups of triangular pyramid periodic structures being arranged in a staggered manner along the second direction, so that the first triangular pyramid units and the second triangular pyramid units of the plurality of groups of triangular pyramid periodic structures are arranged alternately along the second direction.

[0007] In a second aspect, the present application provides a projection system, comprising a projection device and any of the projection screens described above, the projection screen being arranged on the light emitting side of the projection device.

[0008] Compared with the prior art, the projection screen and the projection system provided by the present application have the following advantages. The projection screen comprises a substrate layer and a microstructure layer, the microstructure layer comprises a plurality of groups of triangular pyramid periodic structures, each group of triangular pyramid periodic structures comprises a plurality of groups of triangular pyramid units arranged along a second direction, the second direction is different from the first direction, most of the incident angles of ambient light cannot be reflected back to the viewing angle of the audience by the group of triangular pyramid units, so that the projection screen can resist ambient light, each group of triangular pyramid units comprises one first triangular pyramid unit and one second triangular pyramid unit arranged adjacently and rotationally symmetrically, the top of the first triangular pyramid unit and the top of the second triangular pyramid unit are directed to the same direction, each first triangular pyramid unit comprises a first transmission bottom surface and three first reflection side surfaces connected to the first transmission bottom surface, each second triangular pyramid unit comprises a second transmission bottom surface and three second reflection side surfaces connected to the second transmission bottom surface, the first transmission bottom surface and the second transmission bottom surface are arranged on the substrate layer, the first transmission bottom surface and the second transmission bottom surface are arranged centrally symmetrically, the plurality of groups of triangular pyramid periodic structures are arranged staggeredly along the second direction, so that the first triangular pyramid units and the second triangular pyramid units of the plurality of groups of triangular pyramid periodic structures are arranged alternately along the second direction. In this way, the brightness uniformity of the projection screen can be improved, the projection screen has the characteristics of high gain, and the projection screen not only supports front installation and hanging installation, but also supports front projection and side projection, so that the projection screen is suitable for various projection positions, the universality of the projection screen is improved, and the installation difficulty of the projection screen is reduced. When the projection device projects from the side, the plurality of groups of triangular pyramid periodic structures are periodically arranged on the substrate layer, and there is no fixed center of symmetry, so that six incident light beams incident on the projection screen are divided into six reflected light beams, at least one of the reflected light beams is close to the viewing field of the audience, and therefore, the brightness uniformity of the projection screen can be improved by using this method.

[0009] These and other aspects of the present application will become more apparent from the following description of embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0010] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can also be obtained by those skilled in the art without any creative effort on the basis of these drawings.

[0011] FIG. 1 FIG. 1 is a structural schematic diagram of the projection screen provided by the present application.

[0012] FIG. 2 yes FIG. 1 The diagram shows a partial structural schematic of the projection screen.

[0013] FIG. 3 yes FIG. 1 The diagram shows the structure of the triangular pyramid unit group of the projection screen.

[0014] FIG. 4 It is the light that enters FIG. 1 The diagram shows the structure at the center of the projection screen.

[0015] FIG. 5 When the projector is located FIG. 1 The diagram shows the structure at the bottom of the center line of the projection screen.

[0016] FIG. 6-1 yes FIG. 1 The diagram shows a projection screen with its microstructure layer protruding from the backlight surface.

[0017] FIG. 6-2 yes FIG. 1 The diagram shows a projection screen with its microstructure layer protruding from the light-incident surface.

[0018] FIG. 6-3 yes FIG. 1 The diagram shows a projection screen with its microstructure layer recessed into the backlight surface.

[0019] FIG. 6-4 yes FIG. 1 The diagram shows a projection screen with its microstructure layer recessed into the light-incident surface.

[0020] FIG. 7-1 to FIG. 7-6 yes FIG. 5 The diagram shows the light path of the first prism unit of the projection screen reflecting the incident light.

[0021] FIG. 8-1 to FIG. 8-6 yes FIG. 5 The diagram shows the light path of the first prism unit of the projection screen reflecting the incident light.

[0022] FIG. 9 The incident light from the projector is incident on... FIG. 1 The diagram shows the structure at one edge of the projection screen.

[0023] FIG. 10-1 to FIG. 10-6 yes FIG. 9 The diagram shows the light path of the first prism unit of the projection screen reflecting the incident light.

[0024] FIG. 11 When the projector projects from the side, the incident light is incident on the... FIG. 1The diagram shows the structure at one edge of the projection screen.

[0025] FIG. 12 When the projector projects from the side, the incident light is incident on the... FIG. 1 The diagram shows the structure when the projection screen is in the middle.

[0026] FIG. 13 When the projector is mounted upright, the incident light is incident on the... FIG. 1 The light path diagram shown is for projection onto the screen.

[0027] FIG. 14 When the projector is ceiling-mounted, the incident light is incident on the... FIG. 1 The light path diagram shown is for projection onto the screen.

[0028] FIG. 15-1 to FIG. 15-3 yes FIG. 1 The diagram shows the structure of the triangular pyramid unit group of the projection screen when the aspect ratio changes.

[0029] FIG. 16 yes FIG. 1 A side view of another projection screen is shown.

[0030] FIG. 17 yes FIG. 1 The image shows a side view of another projection screen.

[0031] FIG. 18 This is a schematic diagram of the projection system provided by the present invention. Detailed Implementation

[0032] To facilitate understanding of the embodiments of the present invention, a more complete description of the embodiments will be given below with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a thorough and complete understanding of the disclosure of the present invention.

[0033] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein in the embodiments of the invention is for the purpose of describing particular implementations only and is not intended to limit the invention.

[0034] The inventors of this application discovered that the display chip and lens of mainstream smart micro-projectors on the market are designed with an offset of more than 100%, and the projector's horizontal position is located below the center of the screen. Without an optical structure to adjust the angle of the emitted light, the direction of the emitted light will deviate from the viewer's field of view, affecting the screen's brightness and uniformity.

[0035] In addition, in actual use, the projector has multiple installation positions, which can be installed vertically or hung; it can be projected vertically or laterally, so the directional anti-light screen needs to pay attention to the installation direction, otherwise the screen will be mismatched with the projector, and the designed realistic effect cannot be achieved. In order to reduce the difficulty of screen installation, a screen that can support vertical installation and hanging, as well as vertical projection and lateral projection, can greatly simplify the difficulty of screen processing and installation.

[0036] Since a high-gain anti-environmental light screen can significantly improve the display brightness, and the cost increase is much less than selecting a larger light flux projector, developing a high-brightness and high-brightness uniformity projection screen can greatly improve the experience of the audience using the projector. The mainstream direct projection projector on the market uses a direct projection screen, which uses a white plastic screen and a glass bead screen.

[0037] The existing white plastic screen is internally woven by plastic fibers, and then pressed by front and rear two layers of PVC (Polyvinyl chloride) film to form a "sandwich" structure. Generally, the front surface uses white PVC film, and the back surface uses black PVC film. The incident projection light is reflected by the way of diffuse reflection. The advantage of diffuse reflection is that the brightness consistency in all directions is good, so the viewing angle is large; but because the incident light energy is diffused at a large angle, even in the case of 100% reflectivity of diffuse reflection, the central gain is only 1.0. At the same time, the incident environmental light is also diffused at a large angle, which is very easy to enter the field of view of the audience, so it basically has no anti-environmental light ability.

[0038] The existing metal screen also uses PVC as the base material of the screen, and a reflective coating is made on the PVC base material. The reflective coating is mixed by resin and metal particles and some adhesion and flowability additives. The metal screen can provide higher brightness gain, from 1.0 to 3.0, there are corresponding products; because the diffusion angle of metal is small, and the reflectivity can be more than 80%, the energy of reflected light is concentrated. However, considering the use scene of intelligent micro projection, the projector is generally placed in the center of the screen, parallel to the bottom, and projects from below. In this case, since the metal screen has no ability to correct the main light, that is, the direction of the central light intensity of the reflected light deviates from the audience's market, mainly reflected to the ceiling, so the screen brightness uniformity perceived by the human eye is poor. From the perspective of anti-environmental light, the diffusion angle of the metal screen is small, generally only 40-60 degrees, and most of the environmental light comes from the lamps on the ceiling, a large part of the environmental light is also reflected to the bottom, not into the audience's field of view, so the metal screen has certain anti-environmental light ability.

[0039] However, the brightness uniformity of the above screen is not good, and the screen cannot support the hanging and vertical installation of the projector at the same time, and cannot support the front projection and side projection of the projector at the same time, which increases the difficulty of screen processing and installation.

[0040] In order to improve at least part of the above problems, the applicant proposes a projection screen and a projection system, which not only can resist environmental light, but also supports vertical installation and front projection at the same time, and is suitable for various projector positions, improves universality, and reduces the installation difficulty of the projection screen. In addition, the brightness uniformity of the projection screen is good, and has the characteristics of high gain. The projection screen and the projection system provided by the present application are described in detail below in combination with the specific embodiments and the drawings of the specification.

[0041] Please refer to FIG. 1 to FIG. 4 The present application provides a projection screen 10, which comprises a substrate layer 100 and a microstructure layer 200, the microstructure layer 200 comprises a plurality of groups of triangular pyramid periodic structures 210, the plurality of groups of triangular pyramid periodic structures 210 are arranged on the substrate layer 100 along a first direction D1, each group of triangular pyramid periodic structures 210 comprises a plurality of groups of triangular pyramid units 211 arranged along a second direction D2, the second direction D2 is different from the first direction D1, each group of triangular pyramid units 211 comprises an adjacent first triangular pyramid unit 213 and a second triangular pyramid unit 215, the first triangular pyramid unit 213 and the second triangular pyramid unit 215 are arranged in rotational symmetry, the top of the first triangular pyramid unit 213 and the top of the second triangular pyramid unit 215 are directed to the same direction, each first triangular pyramid unit 213 comprises a first transmission bottom surface 2131 and three first reflection side surfaces connected to the first transmission bottom surface 2131, each second triangular pyramid unit 215 comprises a second transmission bottom surface 2151 and three second reflection side surfaces connected to the second transmission bottom surface 2151, the first transmission bottom surface 2131 and the second transmission bottom surface 2151 are arranged on the substrate layer 100, the first transmission bottom surface 2131 and the second transmission bottom surface 2151 are arranged in central symmetry, and the plurality of groups of triangular pyramid periodic structures 210 are arranged in staggered manner along the second direction D2, so that the first triangular pyramid units 213 and the second triangular pyramid units 215 of the plurality of groups of triangular pyramid periodic structures 210 are arranged alternately along the second direction D2.

[0042] In the present embodiment, the projection screen 10 is generally in the form of a rectangular plate, having a length direction and a width direction. For ease of description, the length direction of the projection screen 10 is defined as consistent with the horizontal direction, the width direction of the projection screen 10 is defined as consistent with the vertical direction, and the thickness direction of the projection screen 10 is defined as consistent with the perpendicular direction.

[0043] The substrate layer 100 can be used to set the microstructure layer 200. In the embodiment, the substrate layer 100 can be directly prepared by laser direct writing or precision lathe processing. The material of the substrate layer 100 can be a transparent organic material such as PC (Polycarbonate) or PMMA (poly methyl methacrylate).

[0044] Please refer to FIG. 5 In an embodiment, the substrate layer 100 includes an incident light surface 110 and a back light surface 130 opposite to each other, wherein the incident light surface 110 faces the incident light emitted by the projection device, and the back light surface 130 is away from the incident light.

[0045] Please refer to FIG. 6-1 to FIG. 6-4 In the embodiment, the microstructure layer 200 is convex on the substrate layer 100, for example, the microstructure can be convex on the incident light surface 110 or the back light surface 130. In an embodiment, the microstructure layer 200 can also be set in the substrate layer 100, the bottom of the microstructure layer 200 can face the incident light, that is, the microstructure layer 200 is concave on the back light surface 130; or the bottom of the microstructure layer 200 can be away from the incident light, that is, the microstructure layer 200 is concave on the incident light surface 110. The setting mode of the microstructure layer 200 is different, and the control principle of the light is the same. For the convenience of description, the following will be described by taking the microstructure layer 200 convex on the back light surface 130 as an example.

[0046] Please continue to refer to FIG. 1 to FIG. 3 The microstructure layer 200 includes a plurality of groups of triangular pyramid periodic structures 210, the plurality of groups of triangular pyramid periodic structures 210 are arranged on the substrate layer 100 along a first direction D1, and the plurality of groups of triangular pyramid periodic structures 210 are arranged on the substrate layer 100 in a plurality of rows, wherein each group of triangular pyramid periodic structures 210 is a row. Each group of triangular pyramid periodic structures 210 includes a plurality of groups of triangular pyramid units 211 arranged along a second direction D2, and the second direction D2 is different from the first direction D1, so that the plurality of groups of triangular pyramid periodic structures 210 are periodically arranged on the substrate layer 100. In the embodiment, the first direction D1 is perpendicular to the second direction D2, wherein the first direction D1 is consistent with the length direction of the projection screen 10, and the second direction D2 is consistent with the width direction of the projection screen 10. In other embodiments, the first direction D1 and the second direction D2 can also be not perpendicular, for example, the included angle between the first direction D1 and the second direction D2 can be 45°, etc.

[0047] Each of the triangular pyramid unit groups 211 comprises one first triangular pyramid unit 213 and one second triangular pyramid unit 215 which are adjacent to each other, and the top of the first triangular pyramid unit 213 and the top of the second triangular pyramid unit 215 are oriented to the same direction, for example, the microstructure layer 200 is convex to the incident surface, and the top of the first triangular pyramid unit 213 and the top of the second triangular pyramid unit 215 are both oriented to the incident light, for another example, the microstructure layer 200 is arranged in the base layer 100, and the top of the first triangular pyramid unit 213 and the top of the second triangular pyramid unit 215 are both away from the incident light. The plurality of triangular pyramid periodic structures 210 are arranged in the second direction D2 with a staggered manner, so that the first triangular pyramid units 213 and the second triangular pyramid units 215 of the plurality of triangular pyramid periodic structures 210 are arranged alternately in the second direction D2, for example, in the first direction D1, the first triangular pyramid unit of the first triangular pyramid periodic structure 210, the second triangular pyramid unit of the second triangular pyramid periodic structure 210, the first triangular pyramid unit of the third triangular pyramid periodic structure 210, the second triangular pyramid unit of the fourth triangular pyramid periodic structure 210, and so on are arranged in sequence from the first row, and so on.

[0048] In an embodiment, the first triangular pyramid unit 213 and the second triangular pyramid unit 215 are arranged in a rotational symmetry manner, that is, the first triangular pyramid unit 213 can coincide with the second triangular pyramid unit 215 after being rotated by 180° around a center point, so that the display effect of the projection screen 10 does not change no matter the projection device is installed in a normal or upside-down manner, so that the projection screen 10 can be adapted to the installation scenarios of the projection device in the normal or upside-down manner. The first triangular pyramid unit 213 and the second triangular pyramid unit 215 are arranged in a central symmetry manner, so that the first triangular pyramid unit 213 and the second triangular pyramid unit 215 can be manufactured by the same process parameters, thereby simplifying the manufacturing process of the microstructure layer 200. In other embodiments, the first triangular pyramid unit 213 and the second triangular pyramid unit 215 can not be mirror-symmetric, but the inclination angles of each triangular pyramid plane are designed separately to meet the viewing requirements of special projection installation positions.

[0049] Each of the first triangular pyramid units 213 comprises a first transmission bottom surface 2131 and three first reflection side surfaces connected to the first transmission bottom surface 2131, wherein the first transmission bottom surface 2131 is used for transmitting the incident light, and the first reflection side surfaces are used for reflecting the incident light, for example, when the top of the first triangular pyramid unit 213 is away from the incident light, the incident light transmits through the first transmission bottom surface 2131 and is incident to the first reflection side surfaces, and the reflected light formed after the reflection of the first reflection side surfaces is at an angle with the incident light. For another example, when the top of the first triangular pyramid unit 213 is oriented to the incident light, the incident light is directly reflected by the first reflection side surfaces to form the reflected light at an angle with the incident light.

[0050] The three first reflective sides are a first side 2133, a second side 2135 and a third side 2137, the first side 2133, the second side 2135 and the third side 2137 are connected to each other in pairs, wherein the first side 2133 can be used to deflect the vertical angular component of the incident light, wherein the vertical angular component refers to the component of the reflected light in the vertical direction. The second side 2135 and the third side 2137 have the ability to change the vertical and horizontal direction components of the incident light.

[0051] In an embodiment, the plane angle of the second side 2135 is equal to the plane angle of the third side 2137, and the plane angle of the first side 2133 is less than the plane angle of the second side 2135, wherein the plane angle here refers to the angle between the first reflective side and the first transmissive bottom surface 2131. Define the plane angle of the first side 2133 as the first plane angle, the plane angle of the second side 2135 as the second plane angle, and the plane angle of the third side 2137 as the third plane angle. In order to facilitate processing, the plane angle of each side can be constant, and for different projection systems with different projection ratios, the setting range of the plane angle of each side of the first triangular prism unit 213 in the projection screen 10 will be different. The relationship between the plane angle of each side of the first triangular prism unit 213 and the projection ratio is shown in Table 1.

[0052] Table 1

[0053] Projection ratio First plane angle Second plane angle Third plane angle Fourth plane angle Fifth plane angle Sixth plane angle 1.2 3 to 12 degrees 5 to 15 degrees 5 to 15 degrees 3 to 12 degrees 5 to 15 degrees 5 to 15 degrees 1.2 3 to 12 degrees 5 to 15 degrees 5 to 15 degrees 3 to 12 degrees 5 to 15 degrees 5 to 15 degrees 0.2 3 to 30 degrees 5 to 50 degrees 5 to 50 degrees 3 to 30 degrees 5 to 50 degrees 5 to 50 degrees 0.2 3 to 30 degrees 5 to 50 degrees 5 to 50 degrees 3 to 30 degrees 5 to 50 degrees 5 to 50 degrees

[0054] As shown in Table 1, for a projection system with a projection ratio of 1.2, the setting range of the first plane angle can be 3-12°, the setting range of the second plane angle can be 5-15°, and the setting range of the third plane angle can be 5-15°. For a projection system with a projection ratio of 0.2, the setting range of the first plane angle can be 3-30°, the setting range of the second plane angle can be 5-50°, and the setting range of the third plane angle can be 5-50°.

[0055] In an embodiment, the projection of the edge line between the second side 2135 and the third side 2137 on the base layer 100 is parallel to the first direction D1, so that the light reflected by the second side 2135 and the light reflected by the third side 2137 can be symmetric about the center symmetry plane of the projection screen 10, wherein the center symmetry plane of the projection screen 10 refers to a vertical plane perpendicular to the plane where the base layer 100 is located, so that the number and intensity of the light reflected to the center symmetry plane of the projection screen 10 are approximately equal, improving the uniformity of the projection screen 10.

[0056] Each second triangular pyramid unit 215 comprises a second transmissive bottom surface 2151 and three second reflective side surfaces connected to the second transmissive bottom surface 2151, the three second reflective side surfaces are respectively a fourth side surface 2153, a fifth side surface 2155 and a sixth side surface 2157, the fourth side surface 2153, the fifth side surface 2155 and the sixth side surface 2157 are connected to each other in pairs, wherein the fourth side surface 2153 can be used to deflect the vertical angular component of the incident light, the fifth side surface 2155 and the sixth side surface 2157 have the ability to deflect the vertical and horizontal angular components of the incident light, wherein the horizontal angular component refers to the component of the reflected light along the horizontal direction. The triangular pyramid unit group 211 can enhance the control of the projection screen 10 on the angle of the reflected light, improve the brightness uniformity of the projection screen 10, and at the same time, due to the horizontal angle deflection ability of the first triangular pyramid unit 213 and the second triangular pyramid unit 215, the projection screen 10 can be applied to the side projection of the projection device.

[0057] In an embodiment, the plane angle of the fifth side surface 2155 is equal to the plane angle of the sixth side surface 2157, and the plane angle of the fourth side surface 2153 is less than the plane angle of the fifth side surface 2155, wherein the plane angle here refers to the angle between the second reflective side surface and the second transmissive bottom surface 2151. Define the plane angle of the fourth side surface 2153 as the fourth plane angle, the plane angle of the fifth side surface 2155 as the fifth plane angle, and the plane angle of the sixth side surface 2157 as the sixth plane angle. In order to facilitate processing, the plane angle of each side surface can be constant, and for different projection systems with different projection ratios, the setting range of the plane angle of each side surface of the second triangular pyramid unit 215 in the projection screen 10 will be different. The relationship between the plane angle of each side surface of the second triangular pyramid unit 215 and the projection ratio is shown in Table 1.

[0058] As shown in Table 1, for a projection system with a projection ratio of 1.2, the setting range of the fourth plane angle can be 3-12°, the setting range of the fifth plane angle can be 5-15°, and the setting range of the sixth plane angle can be 5-15°. For a projection system with a projection ratio of 0.2, the setting range of the fourth plane angle can be 3-30°, the setting range of the fifth plane angle can be 5-50°, and the setting range of the sixth plane angle can be 5-50°.

[0059] In an embodiment, the projection of the edge line between the fifth side surface 2155 and the sixth side surface 2157 on the base layer 100 is parallel to the first direction D1, so that the light reflected by the fifth side surface 2155 and the light reflected by the sixth side surface 2157 can be symmetric about the center symmetry plane of the projection screen 10, so that the number and intensity of the light reflected to the center symmetry plane of the projection screen 10 are approximately equal, thereby improving the uniformity of the projection screen 10.

[0060] The first transmission bottom surface 2131 and the second transmission bottom surface 2151 are arranged on the base layer 100, and the first transmission bottom surface 2131 and the second transmission bottom surface 2151 are arranged in a central symmetry, that is, the first transmission bottom surface 2131 is rotated by 180° along the center point on the base layer 100 to coincide with the second transmission bottom surface 2151, so that the first transmission bottom surface 2131 and the second transmission bottom surface 2151 have the same shape and opposite directions.

[0061] When the microstructure layer 200 is arranged on the backlight surface 130, the first transmission bottom surface 2131 and the second transmission bottom surface 2151 are arranged on the backlight surface 130. When the microstructure layer 200 is arranged in the base layer 100, the first transmission bottom surface 2131 and the second transmission bottom surface 2151 are arranged on the light-incident surface 110; or, the first transmission bottom surface 2131 and the second transmission bottom surface 2151 are arranged on the backlight surface 130.

[0062] In an embodiment, the edge profile shape of the first transmission bottom surface 2131 and the second transmission bottom surface 2151 is an isosceles triangle.

[0063] The principle of the projection screen 10 provided by the present application is described below by taking the microstructure layer 200 arranged on the backlight surface 130 as an example:

[0064] Please refer to FIG. 4 and FIG. 5 When the projection device is located at the bottom of the central axis of the projection screen 10, and the light is incident on the center of the projection screen 10, that is, the installation mode of the projection device is portrait and the projection mode is orthographic projection, the incident light emitted by the projection device is reflected by the microstructure layer 200 after passing through the base material layer. In order to facilitate description, the incident light incident on the first side surface 2133, the second side surface 2135, the third side surface 2137, the fourth side surface 2153, the fifth side surface 2155 and the sixth side surface 2157 is defined as the first incident light I1, the second incident light I2, the third incident light I3, the fourth incident light I4, the fifth incident light I5 and the sixth incident light I6, respectively, and the light reflected after the first side surface 2133, the second side surface 2135, the third side surface 2137, the fourth side surface 2153, the fifth side surface 2155 and the sixth side surface 2157 are defined as the first reflected light R1, the second reflected light R2, the third reflected light R3, the fourth reflected light R4, the fifth reflected light R5 and the sixth reflected light R6, respectively.

[0065] Please refer to FIG. 7-1 to FIG. 7-6For the first triangular pyramid unit 213, the first side 2133 of the first triangular pyramid unit 213 mainly deflects the vertical component of the first incident light I1, and the first reflected light R1 is still in the center symmetry plane of the projection screen 10, and the vertical component of the direction reflected to the audience is increased, wherein in the embodiment, the direction of the audience refers to the normal direction of the projection display side of the projection screen 10 facing the audience; the second side 2135 and the third side 2137 of the first triangular pyramid unit 213 can change the vertical component of the second incident light I2 and the third incident light I3, so that the vertical component of the second reflected light R2 and the third reflected light R3 is increased, and the second reflected light R2 and the third reflected light R3 are shot to the ceiling, wherein the direction towards the ceiling refers to the direction of tilting upwards, so that the audience corresponding to the top of the projection screen 10 can also enjoy a clear picture, at the same time, the second reflected light R2 and the third reflected light R3 deviate from the center symmetry plane of the projection screen 10, and form an angle with each other, thereby increasing the horizontal viewing angle of the projection screen 10, so that the audience located at the edge of the screen can also enjoy a clear picture, and the picture will not appear blue or yellow due to uneven diffuse reflection.

[0066] Please refer to FIG. 8-1 to FIG. 8-6 For the second triangular pyramid unit 215, the fourth side 2153 of the second triangular pyramid unit 215 mainly deflects the vertical component of the fourth incident light I4, and the fourth reflected light R4 is still in the center symmetry plane of the projection screen 10, and the vertical component is increased, and reflected to the direction of the ceiling. The second reflected light R2, the third reflected light R3 and the fourth reflected light R4 cooperate, so that in the direction towards the ceiling, there are reflected lights in the center symmetry plane and on both sides of the projection screen 10, therefore, the audience corresponding to the top of the projection screen 10 (whether in the middle or on both sides) can also enjoy a clear picture. The fifth side 2155 and the sixth side 2157 of the second triangular pyramid unit 215 change the vertical component of the fifth incident light I5 and the sixth incident light I6, so that the vertical component of the fifth reflected light R5 and the sixth reflected light R6 reflected to the direction of the audience is increased, at the same time, the fifth reflected light R5 and the sixth reflected light R6 deviate from the center symmetry plane of the projection screen 10, and form an angle with each other, thereby increasing the horizontal viewing angle of the projection screen 10, so that the audience located at the edge of the screen can also enjoy a clear picture. The first reflected light R1, the fifth reflected light R5 and the sixth reflected light R6 cooperate, so that in the direction towards the audience, there are reflected lights in the center symmetry plane and on both sides of the projection screen 10, and since the projection device is a positive one, therefore, the audience corresponding to the bottom and the middle of the projection screen 10 (whether in the middle or on both sides) can also enjoy a clear picture. In summary, the audience corresponding to any position of the projection screen 10 can enjoy a clear picture, and the viewing experience of the audience is improved.

[0067] Referring to FIG. 9 and FIG. 10-1 to FIG. 10-6 When the projection device is front projection, and the light of the projection device is incident to one side edge of the projection screen 10, the first side surface 2133 of the first triangular prism unit 213 mainly deflects the vertical component of the first incident light I1, and the first reflected light R1 is still in the central symmetry plane, and the vertical component of the first reflected light R1 is increased, and the first reflected light R1 is reflected to the direction of the audience; the second side surface 2135 and the third side surface 2137 of the first triangular prism unit 213 change the vertical component of the second incident light I2 and the third incident light I3, and the vertical component of the second reflected light R2 and the third reflected light R3 is increased, and the second reflected light R2 and the third reflected light R3 are reflected to the ceiling; at the same time, the horizontal component of the second reflected light R2 reflected to the direction of the audience is increased, and the horizontal component of the third reflected light R3 is higher than that of the first reflected light R1, and the third reflected light R3 is reflected to one side of the projection screen 10.

[0068] The oblique incident light of the second triangular prism unit 215 has similar reflection effect. The fourth side surface 2153 of the second triangular prism unit 215 mainly deflects the vertical component of the fourth incident light I4, and the fourth reflected light R4 is still in the central symmetry plane, and the vertical component is increased, and the fourth reflected light R4 is reflected to the direction of the ceiling; the fifth side surface 2155 and the sixth side surface 2157 of the second triangular prism unit 215 change the vertical component of the fifth incident light I5 and the sixth incident light I6, and the vertical component of the fifth reflected light R5 and the sixth reflected light R6 reflected to the direction of the audience is increased; at the same time, the horizontal component of the fifth reflected light R5 reflected to the direction of the audience is increased, and the horizontal component of the sixth reflected light R6 is higher than that of the fourth reflected light R4, and the sixth reflected light R6 is reflected to one side of the projection screen 10.

[0069] Referring to FIG. 11 and FIG. 12 When the projection device is side projection, the situation is similar to that when the projection device is front projection, because the multiple groups of triangular prism periodic structures 210 are periodically arranged on the base layer 100, and there is no fixed symmetry center, so the six incident lights incident to the projection screen 10 will be divided into six reflected lights by the first side surface 2133, the second side surface 2135, the third side surface 2137, the fourth side surface 2153, the fifth side surface 2155 and the sixth side surface 2157 of each triangular prism unit group 211, and at least one reflected light will be close to the field of view of the audience, so that the brightness uniformity of the projection screen 10 can be improved by using this way.

[0070] Referring to FIG. 13 and FIG. 14When the installation mode of the projection device is the front installation, the first reflected light R1, the fifth reflected light R5 and the sixth reflected light R6 are towards the direction of the audience, while the second reflected light R2, the third reflected light R3 and the fourth reflected light R4 are towards the direction of the ceiling; when the installation mode of the projection device is the hanging installation, the second reflected light R2, the third reflected light R3 and the fourth reflected light R4 are towards the direction of the audience, while the first reflected light R1, the fifth reflected light R5 and the sixth reflected light R6 are towards the direction of the floor. Since there is always a reflected light towards the direction of the audience no matter the front installation or the hanging installation, the brightness uniformity of the projection picture is improved, the brightness uniformity of the projection screen 10 is improved, and the projection screen 10 supports the front installation and the hanging installation of the projection device.

[0071] Referring to FIG. 15-1 to FIG. 15-3 In an embodiment, the aspect ratio of the microstructure layer 200 can be adjusted according to the requirements of specific application scenarios to form a suitable reflected light field distribution, wherein the aspect ratio refers to the ratio of the middle line of the first transmission bottom surface 2131 (the second transmission bottom surface 2151) to the bottom edge, that is, the greater the aspect ratio, the narrower the first transmission bottom surface 2131 (the second transmission bottom surface 2151), and vice versa. Changing the aspect ratio of the microstructure layer 200 does not affect the processability of the microstructure layer 200. If the angles of the first plane angle to the sixth plane angle do not change, the light refraction ability of the first side surface 2133 does not change, and the angle of the reflected light does not change. However, the horizontal angle deflection ability of the light of the fifth side surface 2155 and the sixth side surface 2157 increases with the increase of the aspect ratio, and the vertical angle deflection ability of the light decreases with the increase of the aspect ratio.

[0072] In an embodiment, the microstructure layer 200 can be combined with other functional layers to better improve the viewing effect of the projection screen 10.

[0073] Referring to FIG. 16 In an embodiment, the microstructure layer 200 is arranged on the light-incident surface 110. The projection screen 10 further comprises a reflective layer 300 arranged on the first reflective side surface and the second reflective side surface of the plurality of groups of three-prism periodic structures 210. The reflective layer 300 can adopt a coating material mixed with aluminum silver powder, resin, color paste and other raw materials, which is sprayed and / or roll-coated on the first reflective side surface and the second reflective side surface of the plurality of groups of three-prism periodic structures 210.

[0074] Referring to FIG. 17In an embodiment, the projection screen 10 further comprises a protective layer (not shown in the figure) arranged on the side of the reflective layer 300 away from the microstructure layer 200, which can protect the reflective layer 300 from being scratched during transportation or use. The protective layer can be arranged on the side of the reflective layer 300 away from the microstructure layer 200 by using double-sided adhesive tape to paste a protective film material, or by using UV printing or spraying a protective coating layer.

[0075] In an embodiment, the microstructure layer 200 is arranged on the backlight surface 130, and the projection screen 10 further comprises an anti-glare layer 500 arranged on the side of the base layer 100 away from the microstructure layer 200, the anti-glare layer 500 facing the incident light. The anti-glare layer 500 can be made of silica material, and the surface of the anti-glare layer 500 can be formed with high and low optical microstructures by using processes such as sandblasting, acid etching, and surface full-system exposure, so as to improve the diffusion of light and prevent the user from feeling dizzy after long-term viewing.

[0076] In the embodiment, the base layer 100 can be a bulk diffusion layer, which can specifically include a resin base material and diffusion particles such as aluminum powder or PMM particles doped therein. In other embodiments, the base layer 100 can also be a transparent resin layer or a layer of other transparent materials.

[0077] In summary, the projection screen 10 provided by the present application comprises a substrate layer 100 and a microstructure layer 200, the microstructure layer 200 comprises a plurality of groups of triangular pyramid periodic structures 210, the plurality of groups of triangular pyramid periodic structures 210 are arranged on the substrate layer 100 along a first direction D1, each group of triangular pyramid periodic structures 210 comprises a plurality of groups of triangular pyramid units 211 arranged along a second direction D2, the second direction D2 is different from the first direction D1, since the triangular pyramid periodic structures 210 are arranged for incident light of a specific projection ratio or a specific incident angle, the incident angle of most ambient light will not be reflected back to the viewing angle of the audience by the group of triangular pyramid units 211, so that the projection screen 10 can resist ambient light, each group of triangular pyramid units 211 comprises one first triangular pyramid unit 213 and one second triangular pyramid unit 215 which are adjacent to each other, the first triangular pyramid unit 211 and the second triangular pyramid unit 213 are arranged in rotational symmetry, the top of the first triangular pyramid unit 213 and the top of the second triangular pyramid unit 215 are directed to the same direction, each first triangular pyramid unit 213 comprises a first transmission bottom surface 2131 and three first reflection side surfaces connected to the first transmission bottom surface 2131, each second triangular pyramid unit 215 comprises a second transmission bottom surface 2151 and three second reflection side surfaces connected to the second transmission bottom surface 2151, the first transmission bottom surface 2131 and the second transmission bottom surface 2151 are arranged on the substrate layer 100, the first transmission bottom surface 2131 and the second transmission bottom surface 2151 are arranged in central symmetry, the plurality of groups of triangular pyramid periodic structures 210 are arranged in staggered manner along the second direction D2, so that the first triangular pyramid units 213 and the second triangular pyramid units 215 of the plurality of groups of triangular pyramid periodic structures 210 are arranged in alternating manner along the second direction D2. In this way, the brightness uniformity of the projection screen 10 can be improved, and the projection screen 10 has the characteristics of high gain, in addition, the projection screen 10 not only supports front installation and hanging installation, but also supports front projection and side projection, which is suitable for various projector positions, improves the universality, and reduces the installation difficulty of the projection screen 10. When the projection device is used for side projection, since the plurality of groups of triangular pyramid periodic structures 210 are periodically arranged on the substrate layer 100, there is no fixed center of symmetry, therefore, six beams of incident light on the projection screen 10 will be divided into six beams of reflected light, at least one of the six beams of reflected light will be close to the viewing field of the audience, therefore, the brightness uniformity of the projection screen 10 can be improved by using this method.

[0078] In the present application, the parallel can be explained as approximately parallel in a certain plane, the central symmetry can be explained as approximately central symmetry along a point in a certain plane, and the rotational symmetry can be explained as symmetry after rotating by a certain angle in a certain space or a certain plane.

[0079] Please refer to FIG. 18 The present application also provides a projection system 1, comprising a projection device 60 and a projection screen 10, the projection screen 10 is arranged on the light emitting side of the projection device 60.

[0080] In conclusion, the projection system 1 provided by the present application comprises the projection device 60 and the projection screen 10, the projection screen 10 is arranged on the light emitting side of the projection device 60, the brightness uniformity of the projection system 1 not only supports the front installation and the hanging installation, but also supports the front projection and the side projection, is suitable for various projection positions, improves the universality, reduces the installation difficulty of the projection system 1, and has the characteristics of high gain, and can resist the environmental light.

[0081] The above-mentioned embodiments only express several embodiments of the present application, the description is more specific and detailed, but it cannot be understood as the limitation of the patent scope of the present application. It should be pointed out that for ordinary skilled in the art, without departing from the concept of the present application, several modifications and improvements can be made, which belong to the protection scope of the present application. Therefore, the protection scope of the present application patent should be subject to the appended claims.

Claims

1. A projection screen, characterized in that, include: The substrate layer includes an incident light surface and a back light surface that are opposite to each other; as well as The microstructure layer includes multiple sets of triangular pyramidal periodic structures. The multiple sets of triangular pyramidal periodic structures are convexly disposed on the light-incident surface or backlight surface of the substrate layer along a first direction. Each set of triangular pyramidal periodic structures is a row, and each set of triangular pyramidal periodic structures includes multiple sets of triangular pyramidal units disposed along a second direction. Each of the said triangular pyramidal unit groups includes adjacent triangular pyramidal units, which are rotationally symmetric in structure; The first direction and the second square are at a certain angle.

2. The projection screen according to claim 1, characterized in that, Each of the prism units includes a first transmissive bottom surface and three reflective side surfaces, wherein the first transmissive bottom surface is disposed on the base layer.

3. The projection screen according to claim 1, characterized in that, The base layer comprises a transparent organic material, such as polycarbonate or polymethyl methacrylate.

4. The projection screen according to claim 1, characterized in that, The angle between the first direction and the second direction is 90° or 45°.

5. The projection screen according to claim 2, characterized in that, The three reflective sides are the first side, the second side, and the third side, respectively. The first side surface and the first transmissive bottom surface form a first planar angle, the second side surface and the second transmissive bottom surface form a second planar angle, and the third side surface and the third transmissive bottom surface form a third planar angle; The first plane angle, the second plane angle, and the third plane angle are not equal.

6. The projection screen according to claim 2, characterized in that, The projection screen also includes a reflective layer disposed on the reflective side surfaces of the plurality of the triangular pyramidal periodic structures.

7. The projection screen according to claim 6, characterized in that, The projection screen also includes a protective layer or an anti-glare layer, wherein the protective layer is disposed on the side of the reflective layer opposite to the microstructure layer; The anti-glare layer is disposed on the side of the base layer away from the microstructure layer, and the anti-glare layer faces the incident light.

8. The projection screen according to claim 1, characterized in that, The edge contour shape of the first transmissive bottom surface is an isosceles triangle.

9. The projection screen according to claim 1, characterized in that, The projection screen also includes an anti-glare layer, which is disposed on the side of the substrate layer away from the microstructure layer and facing the incident light.

10. A projection system, characterized in that, It includes a projection device and a projection screen as described in any one of claims 1-9, wherein the projection screen is disposed on the light-emitting side of the projection device.

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