A high-definition projection screen and projection system

Abstract

This invention discloses a high-definition projection screen and projection system, relating to the field of projection screen technology, and is used to solve the problem of poor clarity in existing projection screens. The projection system includes a projector and a high-definition projection screen. The high-definition projection screen includes a surface layer, a diffusion layer, a Fresnel lens layer, and a reflective layer arranged in sequence. The diffusion layer is used to diffuse light, and the haze value of the surface layer furthest from the diffusion layer is less than 20%.

Description

Technical Field

[0001] This invention relates to the field of projection screen technology, and more particularly to a high-definition projection screen and projection system. Background Technology

[0002] In the field of projection display, especially in the field of ultra-short-throw laser projection display, in order to achieve better brightness and display effect, projectors are generally used with projection screens with Fresnel microstructures.

[0003] Many existing projection screens consist of a surface layer, a Fresnel lens layer, and a reflective layer arranged in sequence. The surface layer protects the entire projection screen from scratches. The haze value of the surface layer away from the Fresnel lens layer is greater than or equal to 20% to facilitate light diffusion. The Fresnel lens layer has a reflective surface. The reflective layer is a metal layer coated on the reflective surface of the Fresnel lens layer. The material of the reflective layer can be aluminum, silver, or a combination of both.

[0004] In the aforementioned projection screen, the surface of the surface layer away from the Fresnel lens layer is used to diffuse light. Therefore, when light passes through the diffused position (i.e., the surface of the surface layer away from the Fresnel lens layer) twice, it needs to pass through the surface layer twice. This results in a large optical path between the two diffused positions. The larger the optical path between the two diffused positions, the higher the degree of light diffusion, and the worse the overall clarity of the projection screen. Summary of the Invention

[0005] The purpose of this invention is to provide a high-definition projection screen to solve the problem of poor clarity in existing projection screens; another purpose of this invention is to provide a projection system using the above-mentioned high-definition projection screen.

[0006] To achieve the above objectives, the high-definition projection screen provided by this invention adopts the following technical solution:

[0007] In some embodiments of this application, the high-definition projection screen includes a surface layer, a diffusion layer, a Fresnel lens layer, and a reflective layer arranged in sequence. The diffusion layer is used to diffuse light, and the haze value of the surface of the surface layer away from the diffusion layer is less than 20%.

[0008] In the aforementioned high-definition projection screen, a diffusion layer for diffusing light is set between the surface layer and the Fresnel lens layer. At the same time, the haze value of the surface layer away from the diffusion layer is set to less than 20%. Thus, the light mainly diffuses when it passes through the diffusion layer after passing through the surface layer. In this way, the light does not need to pass through the surface layer twice when it passes through the diffusion position. Therefore, the optical path between the two diffusion positions is shorter, so the degree of light diffusion is not too high, resulting in high definition of the high-definition projection screen.

[0009] In some embodiments of this application, the diffusion layer includes a light-diffusing layer and two support layers. The light-diffusing layer is disposed between the two support layers. The light-diffusing layer has a light-transmitting surface for diffusing light. The light-transmitting surface has a tapered portion and / or a widening portion in a direction away from the surface layer. The tapered portion and / or the widening portion and the support layers form a cavity for accommodating air. Two support layers can serve as the assembly base for the entire high-definition projection screen. The surface layer, astigmatism layer, and Fresnel lens layer can be attached to the nearby support layers respectively. The astigmatism layer has a light-transmitting surface. Because the light-transmitting surface has a tapered and / or expanded portion along the direction away from the surface layer, the tapered and / or expanded portion and the support layer form a cavity for accommodating air. Light will enter the air after passing through the astigmatism layer, so refraction will occur. Since the refractive index of the astigmatism layer is necessarily greater than the refractive index of air, light can diffuse when it enters the cavity after passing through the astigmatism layer. Specifically, if the tapered and / or expanded portion on the light-transmitting surface extends along direction A, and the direction away from the surface layer is direction B, then the light will tend to diffuse in direction C when passing through the light-transmitting surface. Direction C is perpendicular to directions A and B. Therefore, by reasonably setting the extension direction of the tapered and / or expanded portion on the light-transmitting surface, the diffusion direction of light can be controlled, and thus the viewing angle of the high-definition projection screen can be directionally controlled.

[0010] In some embodiments of this application, the diffuser layer includes a plurality of light-transmitting protrusions disposed on a support layer, the surfaces of the light-transmitting protrusions forming a light-transmitting surface; or, the diffuser layer includes a base layer, the base layer having a plurality of grooves, the groove walls forming a light-transmitting surface.

[0011] In some embodiments of this application, the light-transmitting protrusions are elongated protrusions, with their length extending parallel to the support layer; the grooves are elongated slots, with their length extending parallel to the support layer. Because the elongated protrusions and slots have relatively long lengths, for a high-definition projection screen of the same size, the number of light-transmitting protrusions or grooves in the diffuser layer can be relatively small, thereby reducing the difficulty of manufacturing the mold for the diffuser layer and reducing the manufacturing difficulty of the high-definition projection screen.

[0012] In some embodiments of this application, the elongated protrusions are straight lines, and the elongated protrusions are arranged in parallel; the long grooves are straight grooves, and the long grooves are arranged in parallel. This arrangement makes the distribution of elongated protrusions or long grooves in the diffuser layer more uniform, thereby improving the diffuser effect of the diffuser layer. In addition, the diffuser layer is generally formed by molding after coating the surface of the support layer with a mold. Setting the elongated protrusions or long grooves to be straight and parallel can reduce the complexity of the corresponding mold shape, thereby reducing the processing difficulty of the mold.

[0013] In some embodiments of this application, the cross-sectional shape and size of the elongated protrusions are the same at all points along their extension direction; the cross-sectional shape and size of the elongated grooves are also the same at all points along their extension direction. This configuration allows the light passing through the diffuser layer to diffuse more uniformly, thereby improving the viewing effect of the high-definition projection screen; in addition, it can reduce the shape complexity of the mold used to manufacture the diffuser layer, thereby reducing the difficulty of mold processing.

[0014] In some embodiments of this application, the elongated protrusions are arranged continuously. This arrangement ensures that all light passing through the astigmatism layer is diffused through the elongated protrusions, thereby expanding the diffusion range of the astigmatism layer and improving its diffusion effect.

[0015] In some embodiments of this application, the cross-section of the elongated protrusion, taken by a surface perpendicular to its extension direction, is semi-circular, trapezoidal, or triangular, and the semi-circular, trapezoidal, and triangular shapes gradually taper away from the surface layer; the cross-sectional shape of the long groove is semi-circular, trapezoidal, or triangular, and the semi-circular, trapezoidal, and triangular shapes gradually expand away from the surface layer. This structural form of elongated protrusion and long groove is simple and easy to manufacture.

[0016] In some embodiments of this application, the diameter of the semicircle ranges from 20 μm to 300 μm.

[0017] In some embodiments of this application, dark dyes are distributed in the surface layer, support layer, or diffuser layer. This configuration can improve the contrast of the high-definition projection screen, while eliminating the need for a dedicated coloring layer, reducing the number of layers and thickness of the high-definition projection screen, and making it easier to roll up.

[0018] In some embodiments of this application, the support layer is made of a flexible material. The surface layer can be made of flexible materials such as UV adhesive (UV is short for Ultra-Violet ray, also known as photosensitive adhesive, UV curing adhesive, shadowless adhesive, UV light curing adhesive, etc.) or thermosetting adhesive, thus possessing flexibility. The support layer can be made of flexible materials such as PET (Polyethylene terephthalate), thus possessing flexibility. The diffuser layer can be made of flexible materials such as UV adhesive, thus possessing flexibility. The Fresnel lens layer can be made of flexible materials such as UV adhesive, thus possessing flexibility. The reflective layer is a very thin metal layer coated on the Fresnel lens layer, so it is flexible. After the flexible reflective layer is coated on the Fresnel lens layer, the Fresnel lens layer and the reflective layer as a whole still possess flexibility, thus making the entire high-definition projection screen flexible and rollable. The rollable high-definition projection screen is very convenient in transportation, installation and use.

[0019] The projection system provided by this invention adopts the following technical solution:

[0020] In some embodiments of this application, the projection system includes a projector and a high-definition projection screen. The high-definition projection screen includes a surface layer, a diffusion layer, a Fresnel lens layer, and a reflective layer arranged in sequence. The diffusion layer is used to diffuse light, and the haze value of the surface of the surface layer away from the diffusion layer is less than 20%.

[0021] In the high-definition projection screen of the aforementioned projection system, a diffusion layer for diffusing light is set between the surface layer and the Fresnel lens layer. At the same time, the haze value of the surface layer far from the diffusion layer is set to less than 20%. Thus, the light mainly diffuses when it passes through the diffusion layer after passing through the surface layer. In this way, the light does not need to pass through the surface layer twice when it passes through the diffusion position. Therefore, the optical path between the two diffusion positions is shorter, so the degree of light diffusion is not too high, thereby making the high-definition projection screen more clear.

[0022] In some embodiments of this application, the diffusion layer includes a light-diffusing layer and two support layers. The light-diffusing layer is disposed between the two support layers. The light-diffusing layer has a light-transmitting surface for diffusing light. The light-transmitting surface has a tapered portion and / or a widening portion in a direction away from the surface layer. The tapered portion and / or the widening portion and the support layers form a cavity for accommodating air. Two support layers can serve as the assembly base for the entire high-definition projection screen. The surface layer, astigmatism layer, and Fresnel lens layer can be attached to the nearby support layers respectively. The astigmatism layer has a light-transmitting surface. Because the light-transmitting surface has a tapered and / or expanded portion along the direction away from the surface layer, the tapered and / or expanded portion and the support layer form a cavity for accommodating air. Light will enter the air after passing through the astigmatism layer, so refraction will occur. Since the refractive index of the astigmatism layer is necessarily greater than the refractive index of air, light can diffuse when it enters the cavity after passing through the astigmatism layer. Specifically, if the tapered and / or expanded portion on the light-transmitting surface extends along direction A, and the direction away from the surface layer is direction B, then the light will tend to diffuse in direction C when passing through the light-transmitting surface. Direction C is perpendicular to directions A and B. Therefore, by reasonably setting the extension direction of the tapered and / or expanded portion on the light-transmitting surface, the diffusion direction of light can be controlled, and thus the viewing angle of the high-definition projection screen can be directionally controlled.

[0023] In some embodiments of this application, the diffuser layer includes a plurality of light-transmitting protrusions disposed on a support layer, the surfaces of the light-transmitting protrusions forming a light-transmitting surface; or, the diffuser layer includes a base layer, the base layer having a plurality of grooves, the groove walls forming a light-transmitting surface.

[0024] In some embodiments of this application, the light-transmitting protrusions are elongated protrusions, with their length extending parallel to the support layer; the grooves are elongated slots, with their length extending parallel to the support layer. Because the elongated protrusions and slots have relatively long lengths, for a high-definition projection screen of the same size, the number of light-transmitting protrusions or grooves in the diffuser layer can be relatively small, thereby reducing the difficulty of manufacturing the mold for the diffuser layer and reducing the manufacturing difficulty of the high-definition projection screen.

[0025] In some embodiments of this application, the elongated protrusions are straight lines, and the elongated protrusions are arranged in parallel; the long grooves are straight grooves, and the long grooves are arranged in parallel. This arrangement makes the distribution of elongated protrusions or long grooves in the diffuser layer more uniform, thereby improving the diffuser effect of the diffuser layer. In addition, the diffuser layer is generally formed by molding after coating the surface of the support layer with a mold. Setting the elongated protrusions or long grooves to be straight and parallel can reduce the complexity of the corresponding mold shape, thereby reducing the processing difficulty of the mold.

[0026] In some embodiments of this application, the cross-sectional shape and size of the elongated protrusions are the same at all points along their extension direction; the cross-sectional shape and size of the elongated grooves are also the same at all points along their extension direction. This configuration allows the light passing through the diffuser layer to diffuse more uniformly, thereby improving the viewing effect of the high-definition projection screen; in addition, it can reduce the shape complexity of the mold used to manufacture the diffuser layer, thereby reducing the difficulty of mold processing.

[0027] In some embodiments of this application, the elongated protrusions are arranged continuously. This arrangement ensures that all light passing through the astigmatism layer is diffused through the elongated protrusions, thereby expanding the diffusion range of the astigmatism layer and improving its diffusion effect.

[0028] In some embodiments of this application, the cross-section of the elongated protrusion, taken by a surface perpendicular to its extension direction, is semi-circular, trapezoidal, or triangular, and the semi-circular, trapezoidal, and triangular shapes gradually taper away from the surface layer; the cross-sectional shape of the long groove is semi-circular, trapezoidal, or triangular, and the semi-circular, trapezoidal, and triangular shapes gradually expand away from the surface layer. This structural form of elongated protrusion and long groove is simple and easy to manufacture.

[0029] In some embodiments of this application, the diameter of the semicircle ranges from 20 μm to 300 μm.

[0030] In some embodiments of this application, dark dyes are distributed in the surface layer, support layer, or diffuser layer. This configuration can improve the contrast of the high-definition projection screen, while eliminating the need for a dedicated coloring layer, reducing the number of layers and thickness of the high-definition projection screen, and making it easier to roll up.

[0031] In some embodiments of this application, the support layer is made of a flexible material. The surface layer can be made of flexible materials such as UV adhesive (UV is short for Ultra-Violet ray, also known as photosensitive adhesive, UV curing adhesive, shadowless adhesive, UV light curing adhesive, etc.) or thermosetting adhesive, thus possessing flexibility. The support layer can be made of flexible materials such as PET (Polyethylene terephthalate), thus possessing flexibility. The diffuser layer can be made of flexible materials such as UV adhesive, thus possessing flexibility. The Fresnel lens layer can be made of flexible materials such as UV adhesive, thus possessing flexibility. The reflective layer is a very thin metal layer coated on the Fresnel lens layer, so it is flexible. After the flexible reflective layer is coated on the Fresnel lens layer, the Fresnel lens layer and the reflective layer as a whole still possess flexibility, thus making the entire high-definition projection screen flexible and rollable. The rollable high-definition projection screen is very convenient in transportation, installation and use. Attached Figure Description

[0032] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] Figure 1 This is a cross-sectional structural schematic diagram of Embodiment 1 of the high-definition projection screen provided by the present invention;

[0034] Figure 2 This is a schematic diagram of the structure of the first support layer and the diffuser layer in Embodiment 1 of the high-definition projection screen provided by the present invention (the cross-section of the elongated protrusion is semi-circular);

[0035] Figure 3 This is a schematic diagram of the path of light passing through the first support layer and the elongated protrusion in Embodiment 1 of the high-definition projection screen provided by the present invention.

[0036] Figure 4 This is a schematic diagram of the structure of the first support layer and the diffuser layer in Embodiment 2 of the high-definition projection screen provided by the present invention (the simulated cross-section of the long groove is semi-circular);

[0037] Figure 5 This is a cross-sectional structural schematic diagram of Embodiment 3 of the high-definition projection screen provided by the present invention;

[0038] Figure 6 This is a schematic diagram of the structure of the first support layer and the diffuser layer in some other embodiments of the high-definition projection screen provided by the present invention (the cross-section of the elongated protrusion is triangular);

[0039] Figure 7 This is a schematic diagram of the structure of the first support layer and the diffuser layer in some other embodiments of the high-definition projection screen provided by the present invention (the cross-section of the elongated protrusion is trapezoidal);

[0040] Figure 8 This is a schematic diagram of the structure of the first support layer and the elongated protrusion in some other embodiments of the high-definition projection screen provided by the present invention (the cross section of the elongated protrusion has an expanding profile section and a contracting profile section along the frontal view direction);

[0041] Figure 9 This is a schematic diagram of the structure of the first support layer and the diffuser layer in some other embodiments of the high-definition projection screen provided by the present invention (the simulated cross section of the long groove has an expanding profile section and a contracting profile section along the frontal view direction). Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] In the description of this invention, it should be understood that the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0044] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "a plurality of" means two or more.

[0045] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection. They can refer to a direct connection or an indirect connection through an intermediate medium, or a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0046] Embodiment 1 of the high-definition projection screen provided by the present invention:

[0047] In the field of ultra-short-throw laser projection displays, to achieve better brightness and display effects, projection screens including Fresnel lens layers are generally selected and used in conjunction with projectors. These projection screens are characterized by high gain, narrow viewing angle, and some resistance to ambient light. The aforementioned projection screen comprises a surface layer, a Fresnel lens layer, and a reflective layer arranged in sequential layers. The haze value of the surface layer, away from the Fresnel lens layer, is generally set to be greater than or equal to 20%, and light diffusion is achieved through this surface layer. In this projection screen, light needs to pass through the surface layer twice during its two passes through the diffusion point (i.e., the surface layer away from the Fresnel lens layer). This results in a longer optical path between the two diffusion points. The longer the optical path between the two diffusion points, the greater the light diffusion, and the worse the overall clarity of the projection screen.

[0048] In view of the above reasons, the present invention provides a high-definition projection screen to improve the clarity of the projection screen and thus improve the viewing experience for the viewer; the high-definition projection screen provided in this embodiment 1 is suitable for projectors that emit monochromatic lasers. To facilitate the explanation of the structure of this high-definition projection screen, this embodiment 1 is described in the state when the high-definition projection screen is unfolded and in use. When the high-definition projection screen is unfolded and in use, it is defined as unfolded along a vertical plane, and the direction in which the viewer looks at the high-definition projection screen is the frontal viewing direction.

[0049] like Figure 1 As shown, the high-definition projection screen includes a surface layer 1, a first support layer 2, a diffuser layer 3, a second support layer 4, a Fresnel lens layer 5, and a reflective layer 6 arranged sequentially along the viewing direction. The first support layer 2, the diffuser layer 3, and the second support layer 4 together constitute the diffusion layer in the high-definition projection screen.

[0050] Both sides of the first support layer 2 and the second support layer 4 are planar along the frontal viewing direction, so that the first support layer 2 and the second support layer 4 serve as the assembly base for the entire high-definition projection screen. Both the first support layer 2 and the second support layer 4 are made of PET, which has good flexibility, allowing both the first support layer 2 and the second support layer 4 to be rolled up. Of course, in other embodiments, the first support layer 2 and the second support layer 4 can also be made of SBC (Styrenic Block Copolymers), which also has flexibility, enabling the first support layer 2 and the second support layer 4 to be rolled up.

[0051] like Figure 2As shown, the astigmatism layer 3 includes multiple elongated protrusions 7, each of which is a straight, semi-cylindrical structure. Specifically, the cross-section of each elongated protrusion 7 taken from a surface perpendicular to its extension direction is semi-circular. The size of the semi-circular cross-section is the same at all points along the extension direction of each elongated protrusion 7. All elongated protrusions 7 in the astigmatism layer 3 have the same shape and size. Figure 1 and Figure 2 As shown, each elongated protrusion 7 extends vertically and is arranged in parallel horizontally. In this embodiment 1, the horizontal direction refers to a direction that is perpendicular to both the viewing direction and the vertical direction. The extension direction of each elongated protrusion 7 is parallel to the first support layer 2, and the elongated protrusions 7 are arranged continuously in the horizontal direction, that is, adjacent elongated protrusions 7 are connected in sequence. The elongated protrusions 7 constitute the light-transmitting protrusions in the light-diffusing layer 3.

[0052] The diffuser layer 3 is made of UV adhesive. Because UV adhesive is elastic, the diffuser layer 3 can be rolled up. To prevent the diffuser layer 3 from becoming too flexible due to the excessively large cross-sectional size of the elongated protrusion 7, the diameter of the semi-circular cross-section of the elongated protrusion 7 taken from a surface perpendicular to its extension direction in this embodiment 1 ranges from 20μm to 300μm. To improve the contrast of the high-definition projection screen, a dark dye is also added to the diffuser layer 3 in this embodiment 1.

[0053] like Figure 1 and Figure 2 As shown, the arc surface of each elongated protrusion 7 faces the second support layer 4, and the plane opposite to the arc surface of each elongated protrusion 7 faces the first support layer 2. This is equivalent to the straight line of the semi-circular cross section of the elongated protrusion 7 cut by the plane perpendicular to its extension direction being located on the side of the arc line closer to the first support layer 2. Then the outline of the semi-circular cross section gradually shrinks in the frontal view direction. Correspondingly, the arc surface of the entire elongated protrusion 7 is gradually shrinking in the frontal view direction.

[0054] When fabricating the diffuser layer 3, UV adhesive is directly applied to the side of the first support layer 2 facing the second support layer 4. Then, a mold with a shape adapted to the elongated protrusions 7 on the diffuser layer 3 is used to imprint the diffuser layer 3. The UV adhesive is then cured using a UV light source, and the diffuser layer 3 is demolded to complete its fabrication. After demolding, the diffuser layer 3 is bonded to the second support layer 4 using OCA adhesive. OCA adhesive is an optical adhesive that is colorless and transparent with a light transmittance of over 90%, good bonding strength, and can be cured at room temperature. It also has advantages such as high weather resistance, water resistance, high temperature resistance, UV resistance, easy thickness control, uniform spacing, and no yellowing after long-term use. After the diffuser layer 3 is bonded to the second support layer 4, the elongated protrusions 7 and the second support layer 4 together form multiple cavities for accommodating air. It should be noted that when bonding the diffuser layer 3 to the second support layer 4, the OCA adhesive should not fill the cavities.

[0055] The Fresnel lens layer 5 is made of UV-cured adhesive. Because UV adhesive is elastic, the Fresnel lens layer 5 can be rolled up. Figure 1 As shown, the Fresnel lens layer 5 has multiple reflective surfaces 9 arranged in the vertical direction on the side away from the second support layer 4. Each reflective surface 9 is a plane that is inclined from top to bottom along the frontal view direction. The angle θ between each reflective surface 9 and the horizontal plane gradually increases from top to bottom, and the angle θ is in the range of 5°-85°.

[0056] When fabricating the Fresnel lens layer 5, UV adhesive is applied to the side of the second support layer 4 away from the first support layer 2. Then, a special mold is used to press the Fresnel lens layer 5 to form it. The UV adhesive is then cured using a UV light source, and the layer is demolded to complete the fabrication of the Fresnel lens layer 5. After the Fresnel lens layer 5 is formed, a reflective layer 6 is coated on each reflective surface 9. The reflective layer 6 is made of aluminum. Of course, in some other embodiments, the reflective layer 6 can also be made of silver, or a combination of silver and aluminum.

[0057] The surface layer 1 is used to protect the high-definition projection screen and prevent it from being scratched, thus reducing its performance. The surface layer 1 is made of UV adhesive and is elastic, so the surface layer 1 can be rolled up.

[0058] When fabricating surface layer 1, UV adhesive is applied to the side of the first support layer 2 away from the second support layer 4. Then, a special mold is used to press surface layer 1 to form it. A UV light source is then used to cure the UV adhesive, and finally, the surface layer 1 is demolded to complete the fabrication. Alternatively, in other embodiments, surface layer 1 can also be formed on the first support layer 2 by curing a hardened coating through heat or UV adhesive, and this method is equally effective.

[0059] In this embodiment 1, in order to improve the clarity of the high-definition projection screen, such as... Figure 1 As shown, the haze value of the surface layer 1 away from the first support layer 2 is set to be less than 20%. When light passes through the surface layer 1, most of it can pass through the surface layer 1 and enter the high-definition projection screen, thereby reducing the degree of light diffusion when entering the high-definition projection screen and thus improving the clarity of the high-definition projection screen.

[0060] Because the surface layer 1, the first support layer 2, the astigmatism layer 3, the second support layer 4, and the Fresnel lens layer 5 are all flexible and rollable, and under normal circumstances, the reflective layer 6 is only a very thin metal layer coated on the reflective surface 9 of the Fresnel lens layer 5, it can be bent. After the flexible reflective layer 6 is coated on the Fresnel lens layer 5, the Fresnel lens layer 5 and the reflective layer 6 can still be rolled up together, so the entire high-definition projection screen can be rolled up.

[0061] like Figure 1 As shown in the figure, the arrows and dashed lines represent the path of the light emitted by the projector 8 after passing through the high-definition projection screen and reaching the viewer. The light emitted by the projector 8 passes through the surface layer 1, the first support layer 2, the scattering layer 3, the second support layer 4, and the Fresnel lens layer 5 in sequence, and is reflected by the reflective surface 9 on the Fresnel lens layer 5 before reaching the viewer.

[0062] like Figure 3 As shown, when light passes through the diffuser layer 3 during its incidence, the light enters the cavity at the corresponding position from each elongated protrusion 7, thereby refracting and diffusing the light. Furthermore, each elongated protrusion 7 has an arc surface that tapers in the frontal view and extends vertically, causing the light to tend to diffuse horizontally. The arc surface of each elongated protrusion 7 constitutes the light-transmitting surface in the diffuser layer 3, and in this embodiment 1, each part of the light-transmitting surface tapers in the frontal view.

[0063] Of course, in other embodiments, the diffusing layer 3 can also be formed by coating the side of the second support layer 4 near the first support layer 2 with UV adhesive. In this case, the arc surface of the elongated protrusion 7 faces the first support layer 2. After the light is reflected by the Fresnel lens layer 5, it can re-enter the diffusing layer 3. When the light passes through the diffusing layer 3 during its outgoing process, the light will also enter the cavity at the corresponding position from each elongated protrusion 7, thereby refracting and diffusing the light. Moreover, the elongated protrusion 7 has an arc surface that gradually expands in the frontal view and extends in the vertical direction, so the light tends to diffuse in the horizontal direction. In this case, the arc surface of each elongated protrusion 7 constitutes the light-transmitting surface in the diffusing layer 3, and each part of the light-transmitting surface gradually expands in the frontal view.

[0064] Using this high-definition projection screen, light does not need to pass through surface layer 1 during its two passes through the diffusion layer, thus shortening the optical path between the two passes of the light through the diffusion layer. The shorter the optical path between the two passes of the light through the diffusion layer, the lower the degree of light diffusion, and the higher the definition of the high-definition projection screen.

[0065] like Figure 1As shown in Embodiment 1, each elongated protrusion 7 in the diffuser layer 3 extends vertically. Therefore, when light passes through the diffuser layer 3, it tends to diffuse horizontally, thus improving the viewing angle of the high-definition projection screen in the horizontal direction. In other embodiments, the elongated protrusions 7 can extend in any other direction. Correspondingly, when light passes through the diffuser layer 3, it can tend to diffuse in another predetermined direction. This predetermined direction is perpendicular to both the viewing direction and the extension direction of the elongated protrusions 7, thus improving the viewing angle of the high-definition projection screen in this predetermined direction.

[0066] Embodiment 2 of the high-definition projection screen provided by the present invention:

[0067] The difference from Example 1 is as follows: Figure 4 As shown, the diffuser layer 3 includes a base layer 12, which is made of UV adhesive. Because UV adhesive is elastic, the base layer 12 can be rolled up, thus allowing the diffuser layer 3 to be rolled up. Multiple long grooves 13 are provided on the side of the base layer 12 away from the first support layer 2. Each long groove 13 is a straight groove or a semi-circular groove, meaning that the simulated cross-section of the long groove 13 cut by a plane perpendicular to its extension direction is semi-circular. Furthermore, the size of the simulated cross-section is the same at all points along the length extension direction of the long groove 13. The straight line of the semi-circular simulated cross-section cut by the plane perpendicular to the extension direction of the long groove 13 is located on the side of the arc away from the first support layer 2. Therefore, the outline of this semi-circular simulated cross-section gradually widens in the frontal view. Correspondingly, the groove wall surface of the long groove 13 also gradually widens in the frontal view. Each long groove 13 extends vertically and is arranged parallel to the horizontal direction. The length extension direction of the long groove 13 is parallel to the first support layer 2. The long grooves 13 provided on the base layer 12 have the same structure. The long groove 13 forms a groove on the base layer 12.

[0068] When making the base layer 12, UV adhesive is applied to the side of the first support layer 2 facing the second support layer 4. Then, a mold with a shape that matches the long grooves 13 on the diffuser layer 3 is used to imprint the base layer 12. The UV adhesive is then cured using a UV light source lamp. Finally, the base layer 12 is demolded to complete the production.

[0069] In this embodiment 2, the base layer 12 is bonded and fixed to the second support layer 4 using OCA adhesive. Each long groove 13 and the second support layer 4 form a cavity for containing air. It should be noted that the OCA adhesive is only used for bonding the base layer 12 and the second support layer 4, and should not enter the long groove 13 in excess.

[0070] Because the diffuse layer 3 is also rollable, the high-definition projection screen in this embodiment 2 can be rolled up as a whole.

[0071] When light passes through the base layer 12 during its incident process, it enters the corresponding cavity from the groove wall surface of each long groove 13, thereby undergoing refraction and achieving light diffusion. Moreover, because the groove wall surface of the long groove 13 gradually expands in the frontal view and extends vertically, the light tends to diffuse in the horizontal direction. The groove wall surface of each long groove 13 constitutes the light-transmitting surface in the light-diffusing layer 3, and in this embodiment 2, each part of the light-transmitting surface gradually expands in the frontal view.

[0072] In this embodiment 2, each long groove 13 in the base layer 12 extends vertically, so the light tends to diffuse horizontally when passing through the diffuser layer 3, thereby improving the viewing angle of the high-definition projection screen in the horizontal direction. In other embodiments, the long grooves 13 can extend in any other direction. Correspondingly, when the light passes through the diffuser layer 3, it can tend to diffuse in a certain set direction. This set direction is perpendicular to both the viewing direction and the extension direction of the long grooves 13, thereby improving the viewing angle of the high-definition projection screen in that set direction.

[0073] Embodiment 3 of the high-definition projection screen provided by the present invention:

[0074] The difference from Example 1 is as follows: Figure 5 As shown, the diffuser layer 3 consists of two layers, both positioned between the first support layer 2 and the second support layer 4. One diffuser layer 3 is attached to the first support layer 2, and the other diffuser layer 3 is attached to the second support layer 4. The two diffuser layers 3 are bonded together using OCA adhesive. After the two diffuser layers 3 are bonded together, the elongated protrusions of the two diffuser layers 3 together form multiple cavities for accommodating air.

[0075] It should be noted that the elongated protrusions of the two light-diffusing layers 3 in this embodiment 3 extend perpendicularly to each other. Specifically, each elongated protrusion in the light-diffusing layer 3 attached to the first support layer 2 extends in the vertical direction, and each elongated protrusion in the light-diffusing layer 3 fixed to the second support layer 4 extends in the horizontal direction.

[0076] When light passes through the diffuser layer 3 attached to the first support layer 2 during its incident process, the light will enter the cavity at the corresponding position from each elongated protrusion, thereby refracting and diffusing the light. Moreover, the elongated protrusion has an arc surface that tapers in the frontal view and extends in the vertical direction, so the light tends to diffuse in the horizontal direction.

[0077] When light passes through the diffuser layer 3 attached to the second support layer 4 during its emission, the light enters the cavity at the corresponding position from each elongated protrusion, thereby refracting and diffusing the light. Moreover, the elongated protrusion has an arc surface that gradually expands in the frontal view and extends in the horizontal direction, so the light tends to diffuse in the vertical direction.

[0078] It should be noted that the OCA adhesive between the two light-diffusing layers 3 is only used for bonding between the two layers, and the OCA adhesive should not be excessively applied to the cavities between the elongated protrusions.

[0079] The high-definition projection screen provided in this embodiment 3 is applicable to projectors that emit monochromatic lasers, dual-color lasers, and tri-color lasers.

[0080] In the above embodiments, a dark dye is added to the astigmatism layer to improve the contrast of the high-definition projection screen. In other embodiments, the dark dye may not be added to the astigmatism layer, but may be added to any one of the surface layer, the first support layer, the second support layer, and the Fresnel lens layer; it can also be used without adding dark dye to any of the layers in the high-definition projection screen.

[0081] In the above embodiments, the diffusion layer consists of a first support layer, a light-diffusing layer, and a second support layer. In other embodiments, the diffusion layer may also be of other types, such as a substrate layer formed of MS (methylmethacrylate-styrene copolymer) material, in which diffusion particles PMMA (polymethyl methacrylate) are distributed. The diffusion particles can diffuse light, and MS has a relatively high hardness, which can serve as the attachment base for the surface layer and the Fresnel lens layer.

[0082] In the above embodiments, the first support layer and the second support layer are made of flexible materials. In other embodiments, the first support layer and the second support layer can also be made of rigid materials, such as MS, which can also be used.

[0083] In Embodiment 1 above, the light-transmitting protrusion is an elongated protrusion with its length extending parallel to the first support layer. In other embodiments, the light-transmitting protrusion can also be a protrusion of other shapes, such as a columnar structure with its axis perpendicular to the first support layer and its length extending in a direction perpendicular to the first support layer. At the end of the columnar structure away from the first support layer, there is an arc surface that gradually narrows or widens in the frontal view, and the arc surface is an elongated arc surface with its length extending in a direction parallel to the first support layer. Adjacent light-transmitting protrusions and the second support layer can also form a cavity for accommodating air, thus achieving light diffusion. This arc surface constitutes a light-transmitting surface.

[0084] In Embodiment 1 above, each elongated protrusion is a semi-cylindrical structure, and the cross-section of each elongated protrusion taken by a surface perpendicular to its extension direction is semi-circular. In other embodiments, each elongated protrusion may also be a structure of other shapes, such as... Figure 6 As shown, the cross-section of each elongated protrusion 7 taken by a plane perpendicular to its extension direction can also be triangular, and the corresponding elongated protrusion 7 is a triangular prism structure. One side of the elongated protrusion 7 faces the first support layer 2, and the edge opposite to that side faces the second support layer. Then, the elongated protrusion 7 gradually tapers along the frontal view, and adjacent elongated protrusions 7 can also form a cavity with the second support layer to accommodate air; or, as Figure 7 As shown, the cross-section of each elongated protrusion 7, taken by a plane perpendicular to its extension direction, is trapezoidal. The planes containing two parallel straight lines in the trapezoidal cross-section are defined as the first side and the second side, respectively. The area of ​​the first side is larger than the area of ​​the second side. The first side faces the first support layer 2, and the second side faces the second support layer. Thus, the elongated protrusion 7 tapers gradually along the frontal view direction. Adjacent elongated protrusions 7 can also form a cavity with the second support layer to accommodate air. Of course, in other embodiments, the shape of the cross-section taken by the plane perpendicular to its extension direction is not limited to the three shapes mentioned above; other shapes are also possible, as long as the cross-section has a tapering section and / or a widening section along the frontal view direction (the cross-sections mentioned above are semicircular, triangular, and trapezoidal, all of which have only a tapering section along the frontal view direction). Figure 8 As shown in the figure, the figure shows a strip-shaped protrusion 7 disposed on the first support layer 2. The cross section of the strip-shaped protrusion 7, which is cut by a surface perpendicular to its extension direction, has both an expanding profile section 10 and a contracting profile section 11. Adjacent strip-shaped protrusions 7 can also form a cavity for containing air together with the second support layer and can also be used.

[0085] In Embodiment 1 above, each elongated protrusion is a parallel semi-cylindrical structure, and the semi-cylindrical structure is straight. In other embodiments, the elongated protrusions may not be straight structures; for example, the elongated protrusions may be bent or curved structures, which can also be used.

[0086] In Embodiment 1 above, the elongated protrusions are arranged continuously along their arrangement direction. In other embodiments, the elongated protrusions can also be arranged at intervals along their arrangement direction, and the same method can be used.

[0087] In Embodiment 1 above, each elongated protrusion is a semi-cylindrical structure, and the cross-section of each elongated protrusion at each point along its extension direction, when cut by a surface perpendicular to its extension direction, is the same. In other embodiments, each elongated protrusion may not be a regular structure, and the cross-section of each elongated protrusion at each point along its extension direction, when cut by a surface perpendicular to its extension direction, may be different, and it can still be used.

[0088] In Embodiment 1 above, each elongated protrusion in the astigmatism layer is a semi-cylindrical structure, meaning that the elongated protrusions in the astigmatism layer have the same structure. In other embodiments, the elongated protrusions in the astigmatism layer may not be completely identical. For example, they may include semi-cylindrical structures, triangular prism structures, quadrangular prism structures, etc., or they may be structures with the same shape but different sizes, all of which can be used.

[0089] In Embodiment 2 above, the groove is a long groove parallel to the length of the first support layer. In other embodiments, the long groove can also be a groove of other shapes, such as a cylindrical groove with its axis perpendicular to the first support layer. The cylindrical groove has an irregularly shaped segment at one end near the first support layer. The groove wall of this irregularly shaped segment is an arc surface that gradually expands along the frontal view direction and is a long, narrow arc surface. Its length extends in the direction parallel to the first support layer, thus achieving light diffusion. This arc surface constitutes a light-transmitting surface.

[0090] In Embodiment 2 above, the long grooves are semi-circular, and the simulated cross-section of each long groove cut by a surface perpendicular to its extension direction is semi-circular. In other embodiments, each long groove can also be a long groove of other shapes, such as: the simulated cross-section of each long groove cut by a surface perpendicular to its extension direction can also be triangular, or the simulated cross-section of each long groove cut by a surface perpendicular to its extension direction can also be trapezoidal, all of which can be used. Of course, in some other embodiments, the shape of the simulated cross-section of each long groove cut by a surface perpendicular to its extension direction is not limited to the above three, and can also be other shapes, as long as the simulated cross-section has a contour tapering section and / or a contour expanding section along the frontal viewing direction (the simulated cross-sections of semi-circle, triangle, and trapezoid are all simulated cross-sections with only a contour expanding section along the frontal viewing direction), such as Figure 9As shown in the figure, the simulated cross section of the long groove 13 set on the base layer 12 shown in the figure, which is cut by a surface perpendicular to its extension direction, has both an expanding profile section 14 and a contracting profile section 15, and can also be used.

[0091] In embodiment 2 above, each long groove is a straight groove that is parallel to each other. In other embodiments, the long grooves may not be straight grooves; for example, the long grooves may be bent grooves or curved grooves, which can also be used.

[0092] In Embodiment 2 above, each long groove is a semi-circular groove, and the cross-sectional shape of the long groove at each point along its extension direction, when cut by a surface perpendicular to its extension direction, is the same. In other embodiments, each long groove may not be a regular groove, and the cross-sectional shape of the long groove at each point along its extension direction, when cut by a surface perpendicular to its extension direction, may be different, and it can still be used.

[0093] In Embodiment 2 above, the long grooves on the base layer have the same structure. In other embodiments, the structures of the long grooves on the base layer may not be exactly the same. For example, they may include long grooves with cross-sectional shapes such as semi-circular, trapezoidal, and triangular. The long grooves on the base layer may also be grooves with the same structure but different sizes, which can also be used.

[0094] In embodiment 3 above, the elongated protrusions of the two astigmatism layers extend perpendicularly to each other. In other embodiments, the elongated protrusions of the two astigmatism layers may not extend perpendicularly. For example, the projection of the axis of one elongated protrusion in one astigmatism layer onto the side of the first support layer facing the second support layer is defined as a first straight line, and the projection of the axis of one elongated protrusion in the other astigmatism layer onto the side of the first support layer facing the second support layer is defined as a second straight line. The extension directions of the first and second straight lines form an acute angle, and the value of this acute angle can be selected within the range of greater than or equal to 30° and less than 90°.

[0095] In Embodiment 3 above, the structure of the two astigmatism layers is the same as that of the astigmatism layer in Embodiment 1 above. In other embodiments, the structure of the two astigmatism layers can also be the same as that of the astigmatism layer in Embodiment 2 above, and can also be used in the same way.

[0096] The present invention also provides a projection system, which includes a high-definition projection screen and a projector. The structure of the high-definition projection screen is the same as that of the high-definition projection screen in the above embodiments, and will not be described again here.

[0097] In the description of this specification, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0098] The above are merely specific embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of protection described in the claims.

Claims

1. A high-definition projection screen, characterized in that, It comprises a surface layer, a diffusion layer, a Fresnel lens layer, and a reflective layer arranged in sequence. The diffusion layer is used to diffuse light, and the haze value of the surface layer away from the diffusion layer is less than 20%. The diffusion layer includes a first support layer, a light-diffusing layer, and a second support layer arranged in sequence. The light-diffusing layer has a light-transmitting surface for diffusing light. The light-transmitting surface has a tapered portion and / or a widening portion in a direction away from the surface layer. The tapered portion and / or the widening portion together with the support layer form a cavity for accommodating air. The first support layer is connected between the surface layer and the astigmatic layer, and the second support layer is connected between the astigmatic layer and the Fresnel lens layer. The surface of the first support layer facing the surface layer is a plane, and the surface of the second support layer facing the Fresnel lens layer is a plane; the surface of the Fresnel lens layer facing the second support layer is a plane.

2. The high-definition projection screen according to claim 1, characterized in that, The diffuser layer includes a plurality of light-transmitting protrusions disposed on a support layer, the surfaces of the light-transmitting protrusions constituting the light-transmitting surface; or, the diffuser layer includes a base layer, the base layer having a plurality of grooves, the groove walls constituting the light-transmitting surface.

3. The high-definition projection screen according to claim 2, characterized in that, The light-transmitting protrusion is an elongated protrusion, and the length of the elongated protrusion extends parallel to the support layer; the groove is an elongated groove, and the length of the groove extends parallel to the support layer.

4. The high-definition projection screen according to claim 3, characterized in that, The elongated protrusions are straight and arranged in parallel; the long grooves are straight grooves and arranged in parallel.

5. The high-definition projection screen according to claim 4, characterized in that, The elongated protrusions have the same cross-sectional shape and size at all points along their extension direction; the elongated grooves have the same cross-sectional shape and size at all points along their extension direction.

6. The high-definition projection screen according to claim 4 or 5, characterized in that, The elongated protrusions are arranged in a continuous pattern.

7. The high-definition projection screen according to claim 3, 4, or 5, characterized in that, The elongated protrusion has a semi-circular, trapezoidal, or triangular cross-section cut by a surface perpendicular to its extension direction, and the semi-circle, trapezoid, and triangle gradually taper away from the surface layer; the long groove has a semi-circular, trapezoidal, or triangular cross-section, and the semi-circle, trapezoid, and triangle gradually expand away from the surface layer.

8. The high-definition projection screen according to claim 7, characterized in that, The diameter of the semicircle ranges from 20μm to 300μm.

9. The high-definition projection screen according to any one of claims 1-5, characterized in that, Dark dyes are distributed in the surface layer, the support layer, or the diffuser layer.

10. The high-definition projection screen according to any one of claims 1-5, characterized in that, The support layer is made of a flexible material.

11. A projection system, characterized in that, Includes a projector and a high-definition projection screen as described in any one of claims 1-10.

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