CN110928133A

CN110928133A - Projection screen and projection system

Info

Publication number: CN110928133A
Application number: CN201911331528.6A
Authority: CN
Inventors: 张益民; 王祖熊; 胡世加; 吴庆富
Original assignee: CHENGDU FSCREEN SCI-TECH Co Ltd
Current assignee: CHENGDU FSCREEN SCI-TECH Co Ltd
Priority date: 2019-12-21
Filing date: 2019-12-21
Publication date: 2020-03-27

Abstract

The invention provides a projection screen and a projection system, and relates to the technical field of medium and long focus optical projection. The projection screen comprises an imaging element layer, an optical structure layer and a reflecting layer which are sequentially arranged along the thickness direction, wherein the optical structure layer is composed of a plurality of rows of triangular prism structures which are mutually arranged, the cross section of the optical structure layer in the thickness direction is a plurality of rows of triangles which are mutually arranged, one side of each triangle is arranged on the surface of the imaging element layer, and the angle of each triangle far away from the imaging element layer is 70-110 degrees; the projection system comprises the projection screen and a projection device. Through the setting, diffuse reflection projection screens such as the screen is moulded to projection screen relative white have luminance height, light energy utilization rate height, the energy consumption is low, the figure definition is high, anti ambient light performance is good, the advantage that the contrast is high, solved traditional well long burnt projection system luminance low, the contrast is low, the image is unclear, anti ambient light performance is poor the problem, obtained fabulous projection display effect.

Description

Projection screen and projection system

Technical Field

The invention relates to the technical field of medium and long focus optical projection, in particular to a projection screen and a projection system.

Background

With the continuous development of projection display technology, projection is widely used as a simple and convenient display mode, for example, in the entertainment life or office needs of a family, projection devices are developed in the directions of small size, light weight, low energy consumption and the like, and projection images are also required to have good image quality, high brightness and high contrast. These requirements are not met by existing mid-tele front projection screens (e.g., white screens). The white plastic screen can only diffuse and reflect the light beams output by the projection device, the transmission direction of the light beams cannot be effectively controlled, and the transmission of ambient light cannot be controlled, so that the light energy utilization rate of the screen is low, the overall brightness of the screen is extremely low, the required power of the projection device is higher, and the energy consumption is higher; and the screen has no light resistance basically, and the problem of low screen contrast is caused.

Disclosure of Invention

In view of the above, an object of the present invention is to provide a projection screen and a projection system, so as to solve the problems of low brightness, low contrast, unclear image and poor ambient light resistance of the conventional projection screen and system.

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

a projection screen comprises an imaging element layer, an optical structure layer and a reflecting layer which are sequentially arranged along the thickness direction, wherein the optical structure layer is composed of a plurality of rows of triangular prism structures which are mutually arranged, the cross section of the optical structure layer in the thickness direction is a plurality of rows of triangles which are mutually arranged, one side of each triangle is arranged on the surface of the imaging element layer, and the angle of the triangle far away from the imaging element layer is 70-110 degrees.

In a preferred option of the embodiment of the present invention, in the projection screen, the imaging element layer includes at least one of a diffusion particle layer, a point lens layer, a diffusion surface layer, or a cylindrical microlens layer, and the imaging element layer performs functions of uniform diffusion imaging, viewing field adjustment, display color adjustment, and the like on the projection light beam.

In a preferred option of the embodiment of the present invention, in the projection screen, the diffusion particle layer includes a transparent substrate layer and a transparent resin layer that are stacked, the transparent resin layer is mixed with diffusion particles, and a scratch-resistant light-transmitting layer is disposed on a side of the transparent substrate layer away from the transparent resin layer. Further, the diffusion particles are spheres or polyhedrons.

In a preferred option of the embodiment of the present invention, in the projection screen, at least one of the dot lens layers is provided, and at least one surface of each of the dot lens layers perpendicular to the thickness direction is provided with a dot lens.

In a preferred option of the embodiment of the present invention, in the projection screen, at least one diffusion surface layer is provided, and at least one surface of each diffusion surface layer in a direction perpendicular to the thickness direction is a non-smooth surface. The diffusion surface layer can control the trend of the projection light beams and can uniformly distribute the projection light beams in a specific area. The diffusion surface layer can be directly coated or transferred on the surface of the optical structure layer, or the diffusion surface layer can be coated or transferred on the transparent substrate layer and then adhered to the optical structure layer through resin.

In a preferred option of the embodiment of the present invention, in the projection screen, the number of the lenticular layers is not less than one, each of the lenticular layers includes a plurality of linear lenticular microlenses arranged in a row, and a cross section of each of the lenticular layers in the thickness direction is a plurality of circles, ellipses, parabolas, arches, or polygons arranged in a row. The columnar microlens layer can be directly coated or transferred on the surface of the optical structure layer, or the columnar microlens layer is firstly coated or transferred on the transparent substrate layer and then is adhered to the optical structure layer through resin.

In a preferred option of the embodiment of the present invention, in the projection screen, an angle of the triangle away from the element layer is 90 °, and the triangular prism structure can reflect light projected onto the optical structure surface by the projection apparatus back along the original direction, thereby effectively reducing incident light reflected outside the viewing area, and improving the brightness of the screen. Meanwhile, ambient light incident above the screen is reflected by the mirror surface to the outside of the viewing area, so that the purpose of improving the contrast of the screen is achieved.

In a preferred option of the embodiment of the present invention, in the projection screen, the reflective layer may be disposed on a surface of the optical structure layer by a physical method, where the physical method includes electroplating, vacuum plating, printing, spraying, or coating transfer printing.

The embodiment of the invention also provides a projection system, which comprises a projection device and a projection screen for performing imaging display based on the projection light beam output by the projection device, wherein the projection screen comprises an imaging element layer, an optical structure layer and a reflecting layer which are sequentially arranged along the thickness direction, the optical structure layer consists of a plurality of rows of triangular prism structures which are mutually arranged, the cross section of the optical structure layer in the thickness direction is a plurality of rows of triangles which are mutually arranged, one side of each triangle is arranged on the surface of the imaging element layer, and the angle of each triangle far away from the imaging element layer is 70-110 degrees.

The embodiment of the invention has the following beneficial effects: the projection screen comprises the imaging element layer, the optical structure layer and the reflecting layer, wherein the imaging element layer, the optical structure layer and the reflecting layer are sequentially arranged in the thickness direction, and the optical structure layer and the reflecting layer are composed of a plurality of rows of triangular prism structures which are mutually arranged. The projection system provided by the embodiment of the invention comprises the projection screen and the projection device, the utilization rate of light energy is effectively improved, the power required by the projection device is reduced, and the energy consumption of the projection system is further reduced.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

Fig. 1 is a schematic structural diagram of a projection screen according to an embodiment of the present invention;

FIG. 2 is a schematic diagram of a layer structure for providing an imaging element according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a diffusion particle layer provided in an embodiment of the present invention;

fig. 4 is a schematic view of a first structure of a dot lens layer according to an embodiment of the present invention;

fig. 5 is a schematic structural diagram of a second dot lens layer according to an embodiment of the present invention;

FIG. 6 is a schematic view of a first structure of a diffusion surface layer according to an embodiment of the present invention;

FIG. 7 is a schematic diagram of a second structure of a diffusion surface layer according to an embodiment of the present invention;

FIG. 8 is a schematic diagram of a first structure of a lenticular microlens layer according to an embodiment of the present invention;

FIG. 9 is a schematic diagram illustrating a second structure of a lenticular microlens layer according to an embodiment of the present invention;

FIG. 10 is a schematic diagram illustrating a third structure of a lenticular microlens layer according to an embodiment of the present invention;

FIG. 11 is a cross-sectional view of two structures of an optical structure layer according to an embodiment of the present invention;

FIG. 12 is an optical path diagram of a projection beam passing through a projection screen of a first configuration according to an embodiment of the present invention;

FIG. 13 is a diagram of an optical path formed by a projection beam passing through a projection screen of a second configuration according to an embodiment of the present invention;

FIG. 14 is a diagram of an optical path formed by a projection beam passing through a projection screen having a third configuration according to an embodiment of the present invention;

FIG. 15 is a diagram of an optical path formed by a projection beam passing through a projection screen of a fourth configuration according to an embodiment of the present invention;

FIG. 16 is a diagram illustrating an optical path of ambient light above a reflective screen of a projection screen according to an embodiment of the present invention;

fig. 17 is a schematic diagram of a projection system according to an embodiment of the invention.

Icon: 10-a projection system; 20-a projection screen; 100-an imaging element layer; 101-a diffusion particle layer; 102-a diffusion surface layer; 103-a lenticular layer; 104-optical structure layer; 105-a reflective layer; 106-dot lens layer; 111-diffusion particles; 112-non-smooth face; 113-linear cylindrical microlenses; 114-triangular optical structures; 115-point lens; 120-a transparent substrate layer; 130-a light transmitting layer; 140-a transparent resin layer; 150-rough surface; e-projecting the light beam; e1 — first ray; e2 — second ray; f-ambient light; g-audience; t-projection device.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

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

The technical scheme of the invention is further explained by combining the attached drawings.

As shown in fig. 1, an embodiment of the present invention provides a projection screen 20, which includes an imaging element layer 100, an optical structure layer 104, and a reflective layer 105 sequentially disposed along a thickness direction, where the optical structure layer 104 is composed of a plurality of rows of triangular prism structures 114, the cross section of the optical structure layer 104 in the thickness direction is a plurality of rows of triangles, one side of each triangle is disposed on a surface of the imaging element layer 100, and an angle of each triangle away from the imaging element layer 100 is 70 ° to 110 °.

It is to be understood that the triangle in the cross section of the optical structure layer 104 in the thickness direction may be any angle in the range of 70 ° to 110 ° away from the imaging element layer 100, and is not limited to 70 ° or 110 °.

In particular, the projection screen 20 may further include a speckle suppression layer disposed on a side of the imaging element layer 100 away from the optical structure layer 104, where each position of the speckle suppression layer is different from a phase of the projection beam, so as to eliminate alternate bright and dark irregular spots generated by interference of the projection beam on the screen, and improve the definition of image display of the projection screen.

In the present embodiment, as shown in fig. 2 to 10, the imaging element layer 100 includes at least one of a diffusion particle layer 101, a dot lens layer 106, a diffusion surface layer 102, or a pillar microlens layer 103. That is, the imaging element layer 100 may be any one of the diffusing particle layer 101, the dot lens layer 106, the diffusing surface layer 102, and the lenticular lens layer 103; any two of the diffusion particle layer 101, the dot lens layer 106, the diffusion surface layer 102, and the pillar microlens layer 103 may be laminated; any three of the diffusion particle layer 101, the dot lens layer 106, the diffusion surface layer 102, and the pillar microlens layer 103 may be laminated without limiting the positional relationship; the diffusion particle layer 101, the dot lens layer 106, the diffusion surface layer 102, and the pillar microlens layer 103 may be laminated, and the positional relationship between the layers is not limited.

In particular, the imaging element layer 100 may also be uniformly doped with pigment or toner, or a colored layer may be separately provided in the structure of the imaging element layer 100, and the position of the colored layer may be adjusted as needed, and may be located between the structures of the imaging element layer 100, or may be located outside the structures of the imaging element layer 100.

In the present embodiment, as shown in fig. 2, the imaging element layer 100 is formed by sequentially laminating the diffusion surface layer 102, the diffusion particle layer 101, and the lenticular lens layer 103 in the thickness direction; the diffusion surface layer 102, the diffusion particle layer 101, and the lenticular lens layer 103 may have a single-layer structure or a multilayer structure.

In the present embodiment, as shown in fig. 3, the diffusion particle layer 101 includes a transparent substrate layer 120 and a transparent resin layer 140 stacked, the diffusion particles 111 are mixed in the transparent resin layer 140, and a scratch-resistant light-transmitting layer 130 is provided on a side of the transparent substrate layer 120 away from the transparent resin layer 140.

In this embodiment, the light-transmitting layer 130 may have scratch resistance, may be a protective film that is scratch resistant, or may be a light-transmitting resin material having a high hardness in a cured state. The light-transmitting layer 130 is laminated on one side of the transparent substrate layer 120, so that the effects of glare resistance and speckle suppression on the surface of the screen can be achieved.

In this embodiment, the specific material composition of the transparent substrate layer 120 is not limited, and may be set according to the actual application requirement. That is, the transparent substrate layer may be a flexible structure or a structure having a certain rigidity. The transparent substrate layer 120 of the flexible structure includes, but is not limited to, flexible transparent plastic or rubber films such as PE, PVC, CPP, BOPP, PC, PET, PMMA, polycarbonate, PA, TPU, etc. The transparent substrate layer 120 having a certain rigid structure includes, but is not limited to, a transparent substrate such as glass, acryl, ceramic, and the like. In addition, the visible light transmittance of the transparent substrate layer 120 is not particularly limited, and may be set according to the actual application requirements; in this embodiment, for the excellent effect of the imaging display, the visible light transmittance of the transparent substrate layer 120 may be ensured to be greater than or equal to 75%.

In this embodiment, the transparent resin layer 140 may be a thermosetting resin, a radiation-curable resin, or a reaction-curable resin, and the transparent resin layer 140 may be selected according to actual production requirements.

In this embodiment, the material, the number, and the ratio of the diffusion particles 111 are not limited, and specific materials may be selected and specific number ratios may be set according to the actual viewing field and the requirement of the uniformity of the screen display brightness. Specifically, the material of the diffusion particles 111 is not limited, and may be a metal material or a non-metal material, and in actual production, the refractive index of the diffusion particles 111 may be as different as possible from the refractive index of the transparent resin layer 140 so as to diffuse the projection light beam entering the transparent resin layer 140.

In this embodiment, the manner of mixing the diffusion particles 111 in the transparent resin layer 140 is not limited, and may be specifically set according to the requirements of the actual viewing field and the uniformity of the screen display brightness. The setting mode includes but is not limited to: the diffusion particles 111 are mixed with a liquid resin, and then are formed on the surface of the transparent substrate layer 120 away from the light-transmitting layer by coating.

In this embodiment, the distribution manner of the diffusion particles 111 in the transparent resin layer 140 is not limited, and for example, the diffusion particles 111 may be distributed in the transparent resin layer 140 in an ordered manner, or may be arranged in the transparent resin layer 140 in a disordered and disordered manner. In order to have better imaging display effect and enable the projection light beam to be better diffused, the diffusion particles 111 are orderly arranged in the transparent resin layer 140 according to a multilayer array.

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

In this embodiment, as shown in fig. 4, the point-shaped lens layer 106 is a single layer, the point-shaped lenses 115 are disposed on the plane of the point-shaped lens layer 106 in the vertical thickness direction, and the point-shaped lenses 115 are uniformly distributed on the plane of the point-shaped lens layer 106 in the vertical thickness direction, so as to uniformly diffuse the projection light beam and achieve better imaging.

In this embodiment, as shown in fig. 5, the dot-shaped lens layers 106 are arranged in a multi-layer structure, each layer of the dot-shaped lens layers 106 is provided with dot-shaped lenses 115 on a plane perpendicular to the thickness direction, the dot-shaped lenses 115 are uniformly distributed on the plane perpendicular to the thickness direction of the dot-shaped lens layers 106, and the multi-layer structure of the dot-shaped lens layers 106 plays a role in more uniformly diffusing incident light.

In the present embodiment, as shown in fig. 6, the diffusion surface layer 102 is provided as a single layer, the diffusion surface layer 102 has a non-smooth surface 112 on one side perpendicular to the thickness direction, and the projection light beam can be diffused on the non-smooth surface 112 when entering the diffusion surface layer 102.

In this embodiment, as shown in fig. 7, the diffusion surface layer 102 is provided as a multi-layer structure, and one surface of each diffusion surface layer 102 perpendicular to the thickness direction is a non-smooth surface 112, so that the projection light beam entering the diffusion surface layer 102 is diffused more sufficiently, and a more uniform luminance display is obtained.

It is understood that the diffusion surface layer 102 can be directly used as the imaging element layer 100, directly coated or transferred on the side of the optical structure layer 104 away from the reflective layer 105, and sequentially laminated with the optical structure layer 104 and the reflective layer 105 to form the projection screen 20; the diffusion surface layer 102 may be combined with at least one of the diffusion particle layer 101, the dot-shaped lens structure layer 106, and the lenticular lens layer 130, which are formed of the transparent substrate layer 120 and the transparent resin layer 140, to form the image forming element layer 100, and the diffusion surface layer 102 may be applied or transferred to the transparent substrate layer 120 on the side away from the transparent resin layer 140 to form the image forming element layer.

Specifically, the non-smooth surface 112 may be a surface with a rugged structure, where the specific shape, number and distribution of the rugged structure may be set according to the actual application requirement. For example: the non-smooth surface 112 may be formed of an irregular concave-convex shape, may be formed of a regular concave-convex shape, or may be formed of a combination of an irregular concave-convex shape and a regular concave-convex shape; the asperities in the non-smooth surface 112 can be tens, hundreds, or thousands; the non-smooth portions 112 may be arranged orderly according to a certain rule, may be arranged randomly according to a certain rule, may be arranged orderly according to a certain rule, and may be arranged randomly according to a certain rule. In order to improve the diffusion capability of the diffusion surface layer 102 to the projection light beam, the non-smooth surface 112 may be randomly arranged.

In this embodiment, as shown in fig. 8, the lenticular lens layer 103 is a one-layer structure, the lenticular lens layer 103 is formed by a plurality of linear lenticular lenses 113 arranged in rows, and the cross section of the lenticular lens layer 103 in the thickness direction is a plurality of circular, arc, or bow shapes arranged in rows.

In this embodiment, as shown in fig. 9, the lenticular lens layer 103 is a multilayer structure, the lenticular lens layer 103 is composed of a plurality of linear lenticular lenses 113 arranged in rows, and the cross section of the lenticular lens layer 103 in the thickness direction is a plurality of circles or arcs or arches arranged in rows; the shape and arrangement of each layer of the lenticular microlens layers 103 are the same, that is, the lenticular microlens layers 103 of each layer are the same, and the lenticular microlens layers 103 of each layer are stacked in the same direction.

In this embodiment, as shown in fig. 10, the first layer of the lenticular microlens layer 103 is disposed in the same manner as in fig. 9, except that: the second layer of the lenticular microlens layer 103 is rotated 90 ° along the plane and then laminated with the first layer of the lenticular microlens layer 103; the third layer of the lenticular microlens layer 103 is arranged in the same direction as the first layer of the lenticular microlens layer 103, and is laminated with the second layer of the lenticular microlens layer 103; the fourth layer of the lenticular microlens layer 103 is arranged in the same direction as the second layer of the lenticular microlens layer 103, and is laminated with the second layer of the lenticular microlens layer 103 in sequence according to the above rule.

Specifically, the linear lenticular microlens layer 103 may be directly coated or transferred on the side of the optical structure layer 104 away from the reflective layer 105, or bonded to at least one of other structures such as the diffusion particle layer 101, the point lens layer 106, or the diffusion surface layer 102, and then the side of the optical structure layer 104 away from the reflective layer 105 is adhered.

In this embodiment, as shown in fig. 11, the optical structure layer 104 is composed of a plurality of triangular prism structures 114 arranged in a row, a cross section of the optical structure layer 104 in the thickness direction is a triangle formed by a plurality of triangular prism structures 114 arranged in a row, one side of the triangle is disposed on the surface of the imaging element layer 100, and an angle α of the triangle away from the imaging element layer 100 is 70 ° to 110 °.

It is understood that the triangular prism structures 114 may be the same or different, and that the two sides forming the angle α may or may not be equal, and that the angle α of the triangle away from the imaging element layer 100 may be set between 70 ° and 110 ° according to practical requirements, so as to achieve the purpose of adjusting the reflection of the projected light to a specific viewing area.

Specifically, the angle α is preferably selected to be 90 °, and when the angle α is 90 °, the incident light to the triangular prism structure 114 can be all returned in a direction parallel to the incident light, so that the projection screen obtains the best brightness and contrast.

In the present embodiment, as shown in fig. 12 to 15, light path diagrams of projection screens having four different structures are shown. The projection screen comprises an imaging element layer 100, an optical structure layer 104 and a reflecting layer 105 which are sequentially arranged along the thickness direction; the optical structure layer 104 is composed of a plurality of rows of mutually arranged triangular prism structures 114; the reflective layer 105 is disposed on the plane formed by the two edges of the rhomboid column structure 114. As shown in fig. 12, the imaging element layer 100 is formed of a diffusion particle layer 101 mixed with diffusion particles 111; as shown in fig. 13, the imaging element layer 100 is formed of a dot lens layer 106, and a row of dot lenses 115 arranged in a row are provided on one surface of the dot lens layer 106 perpendicular to the thickness direction; as shown in fig. 14, the imaging element layer 100 is formed from a diffusion surface layer 102, the diffusion surface layer 102 being a matte surface 112 on the side away from the optical structure layer 104; as shown in fig. 15, the imaging element layer 100 is formed of a lenticular lens layer 103, the lenticular lens layer 103 is formed of linear lenticular lenses 113 arranged in rows, and the cross section of the lenticular lens layer 103 in the thickness direction is formed of arcuate shapes arranged in rows. The projection light beam E strikes the projection screen, sequentially passes through the imaging element layer 100 and the optical structure layer 104 to reach the reflection layer 105 for reflection, and enters the imaging element layer 100 again to diffuse and image a specific optical path, which is shown in fig. 12 to 15. Wherein the projection light beam E enters the optical structure layer 104 through the imaging element layer 100 as a first light ray E1; the first light ray E1 is reflected by the optical structure layer 104 and the reflective layer 105 to obtain a second light ray E2.

Specifically, the cross section of the optical structure layer 104 in the thickness direction is a plurality of triangles arranged in a row, and the angle α of the triangle far from the imaging element layer 100 is 90 °, so that a first light ray E1 of the projection light beam E entering the optical structure layer 104 through the imaging element layer 100 and a second light ray E2 obtained by reflecting the first light ray E1 through the optical structure layer 104 and the reflection layer 105 are parallel to each other, but the transmission directions are opposite, and the first light ray E1 and the second light ray E2 cannot be reflected outside a specific viewing field.

It is understood that the reflectivity of the reflective layer 105 to visible light can be set according to the requirements of practical application, that is, according to the requirements of imaging display effect. In particular, the reflectivity of the reflective layer 105 to visible light is greater than or equal to 60% to ensure the best imaging effect. In addition, no corresponding convention is made on the thickness of the reflecting layer 105, and the thickness of the reflecting layer 105 can be controlled to be 50 nm-50000 nm for the best effect. The reflective layer 105 may be a metal reflective layer, an alloy reflective layer, or a non-metal composite reflective layer, as long as it has a certain reflective capability to visible light; the metal reflective layer includes, but is not limited to: aluminum, silver, gold, chromium, nickel, copper; the alloy reflective layer includes, but is not limited to: nickel-chromium alloy and aluminium alloyGold, titanium alloys; the non-metallic composite reflective layer includes, but is not limited to: TiO 2₂/SiO₂，Nb₂O₅/SiO₂， Ta₂O₅/SiO₂，Al₂O₃/SiO₂，HfO₂/SiO₂，TiO₂/MgF₂，Nb₂O₅/MgF₂，Ta₂O₅/MgF₂，Al₂O₃/MgF₂，HfO₂/MgF₂The film stack structure is formed by alternately combining materials with equal height and low refractive index.

In this embodiment, in order to prevent the reflective layer 105 from being oxidized and deteriorated and falling off after long-term use, and to prolong the service life of the projection screen, the projection screen 20 may further include a protective layer, and the protective layer is disposed on the surface of the reflective layer 105 away from the optical structure layer 104; the materials of the protective layer include, but are not limited to: SiO 2₂、Si₃N₄、Al₂O₃、SiCN、TiO₂SiN, SiC, chromium, nickel, stainless steel, aluminum plates, glass plates, ceramic plates and iron plates, scratch-resistant resin, PET protective films, hot melt adhesives and the like.

In this embodiment, as shown in fig. 16, an ambient light F incident on the optical structure layer 104 from above the projection screen 20 passes through the reflective layer 105 on the surface of the optical structure layer 104 and undergoes specular reflection along the direction of the triangular prism structure 114 of the optical structure layer 104, and the ambient light F is reflected and then is far away from the viewing area, so that the projection light beam E is not affected by the ambient light F, and the contrast of the projection screen is effectively improved.

In this embodiment, as shown in fig. 17, a projection system 10 provided by the present invention includes a projection screen 20 and a projection apparatus T, where the projection screen 20 includes an imaging element layer 100, an optical structure layer 104 and a reflective layer 105 that are sequentially disposed along a thickness direction, the optical structure layer 104 is composed of a plurality of triangular prism structures 114 arranged in rows, a cross section of the optical structure layer 104 in the thickness direction is a triangle formed by a plurality of triangles arranged in rows, one side of the triangle is disposed on a surface of the imaging element layer 100, and an angle of the triangle away from the imaging element layer 100 is 70 ° to 110 °. The projection device T emits a projection light beam E which is diffused and imaged based on the imaging element layer 100 of the projection screen 20, and is reflected based on the optical structure layer 104 and the reflective layer 105. It can be understood that the transmission path of the projection light beam E in the projection screen 20 can be controlled by adjusting the angle of the triangle away from the imaging element layer 100, so as to reduce the energy reflected by the projection light beam E to the outside of the viewing range of the viewer G, and effectively improve the display brightness of the projection screen. Under the condition that the brightness of the projection beam E emitted by the projection device T is low, the angle adjustment variation of the angle of the triangle far from the imaging element layer 100 is not too large, so as to prevent the light from being too dispersed, and the display brightness of the projection screen is too low.

In particular, the imaging element layer 100 may be formed by alternately laminating the diffusion particle layer 101, the dot lens layer 106, the diffusion surface layer 102, and the pillar microlens layer 103, and the light beam diffusing capability of the imaging element layer 100 may be further improved, so as to further improve the imaging display effect.

In this embodiment, the projection screen 20 further includes a scratch-resistant layer, the scratch-resistant layer is disposed on one side of the imaging element layer 100 away from the optical structure layer 104, so as to effectively prevent the projection screen 20 from being scratched during the production, manufacture, packaging, transportation, use and cleaning processes to affect the viewing effect, and improve the utility value of the screen.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A projection screen is characterized by comprising an imaging element layer, an optical structure layer and a reflecting layer which are sequentially arranged along the thickness direction, wherein the optical structure layer is composed of a plurality of rows of triangular prism structures which are mutually arranged, the cross section of the optical structure layer in the thickness direction is a plurality of rows of triangles which are mutually arranged, one side of each triangle is arranged on the surface of the imaging element layer, and the angle of each triangle far away from the imaging element layer is 70-110 degrees.

2. A projection screen according to claim 1 wherein the imaging element layer comprises at least one of a diffusing particle layer, a dot lens layer, a diffusing surface layer and a lenticular layer.

3. The projection screen of claim 2 wherein the diffusing particle layer comprises a transparent substrate layer and a transparent resin layer laminated together, the transparent resin layer having diffusing particles mixed therein, the transparent substrate layer being provided with a scratch-resistant light transmitting layer on a side thereof remote from the transparent resin layer.

4. A projection screen according to claim 3 wherein the diffusing particles are spheres or polyhedrons.

5. A projection screen according to claim 2 wherein said dot lens layers are not less than one layer, each of said dot lens layers having dot lenses on at least one side perpendicular to the thickness direction.

6. A projection screen according to claim 2 wherein said diffusing surface layer is not less than one layer, each said diffusing surface layer having at least one non-smooth surface perpendicular to the thickness direction.

7. The projection screen of claim 2, wherein the lenticular layer is not less than one layer, each layer of lenticular layer comprises a plurality of rows of linear lenticular lenticules, and the cross section of each layer of lenticular lenticules in the thickness direction is a plurality of mutually arranged circles, ellipses, parabolas, arches or polygons.

8. A projection screen according to claim 1 wherein the angle of the triangle away from the layer of imaging elements is 90 °.

9. The projection screen of claim 1 wherein the reflective layer is disposed on the surface of the optical structure layer by a physical process comprising at least one of electroplating, vacuum plating, printing, spraying, or coating transfer.

10. A projection system is characterized by comprising a projection device and a projection screen for carrying out imaging display on the basis of projection beams output by the projection device, wherein the projection screen comprises an imaging element layer, an optical structure layer and a reflection layer which are sequentially arranged along the thickness direction, the optical structure layer is composed of a plurality of rows of triangular prism structures which are mutually arranged, the cross section of the optical structure layer in the thickness direction is a plurality of rows of triangles which are mutually arranged, one side of each triangle is arranged on the surface of the imaging element layer, and the angle of each triangle far away from the imaging element layer is 70-110 degrees.