Projection screen, projection equipment, microstructure lens mold and manufacturing method thereof

Abstract

The invention discloses a projection screen, projection equipment, a microstructure lens mold and a manufacturing method thereof, relates to the technical field of projection display, and is used for solving the problem that the light convergence effect of an existing projection screen is poor. The microstructure lens mold includes a mold body. The mold body has a plurality of microstructures. The microstructure is provided with a reflecting surface, and the reflecting surface is an inclined surface. And the plurality of microstructures are used for imprinting the surface of one side of the microstructure layer to form a microstructure surface. The micro-structural surface comprises a plurality of reflecting surfaces formed by imprinting structural surfaces. The microstructure layer is further provided with a first plane opposite to the microstructure surface. Inclination angles and inclination directions of the plurality of reflecting surfaces relative to the first plane are different, and part of the reflecting surfaces pass through the same arc. And the plurality of reflecting surfaces are used for converging part of projection light projected to the reflecting surfaces to the same observation point. The micro-structure lens mold is used for manufacturing a micro-structure lens.

Description

Technical Field

[0001] The present application relates to the field of projection display technology, and in particular to a projection screen, a projection device, a microstructure lens mold and a manufacturing method thereof. Background Art

[0002] In the field of projection display technology, projectors are generally used in conjunction with projection screens. The light emitted by the projector is projected onto the projection screen, and after being reflected by the projection screen, it reaches the audience's eyes, and the audience can then see the image formed by the light on the surface of the projection screen.

[0003] In order to improve the projection effect of the projection screen, the projection screen generally includes a Fresnel lens layer, which can converge light and thus improve the gain of the projection screen.

[0004] However, the existing Fresnel lens layer has a poor light convergence effect and cannot meet the needs of users. Summary of the invention

[0005] The present application provides a projection screen, a projection device, a microstructure lens mold and a manufacturing method thereof, which are used to solve the problem of poor light convergence effect of existing projection screens.

[0006] In order to achieve the above purpose, this application adopts the following technical solutions:

[0007] On the one hand, an embodiment of the present application provides a microstructure lens mold, including a mold body. The mold body has a plurality of microstructures. The microstructure has a reflective surface, and the reflective surface is an inclined surface. A plurality of microstructures are used to emboss the surface of one side of the microstructure layer to form a microstructure surface. The microstructure surface includes a plurality of reflective surfaces formed by embossing the structure surface. Among them, the microstructure layer also has a first plane arranged opposite to the microstructure surface. The inclination angles and inclination directions of the plurality of reflective surfaces relative to the first plane are different, and some of the reflective surfaces pass through the same arc. The plurality of reflective surfaces are used to converge part of the projection light projected onto the reflective surface to the same observation point.

[0008] The microstructure lens mold provided in the embodiment of the present application can be manufactured to form a microstructure layer, and the multiple reflective surfaces of the microstructure layer can respectively converge part of the projected light projected onto the reflective surface to the same observation point, and the formed microstructure layer has a better convergence effect. At the same time, because the formed partial reflective surfaces pass through the same arc, the microstructure surface of the microstructure layer can make the light projected onto the reflective surfaces at different positions on the same arc converge to the observation point, ensuring the convergence effect of the light.

[0009] In some embodiments, along the first direction, a plurality of reflective surfaces are arranged in a plurality of rows, and each row has a plurality of reflective surfaces arranged along the second direction, wherein the first direction and the second direction are perpendicular to each other, and both the first direction and the second direction are parallel to the first plane.

[0010] In some embodiments, the structure surface is polygonal in shape.

[0011] In some embodiments, the lengths of the side edges of the structure surface are all less than or equal to 200 um.

[0012] In some embodiments, the mold is in the shape of a plate or a cylinder.

[0013] In some embodiments, the projection light projected onto the center position of the reflection surface converges to the same observation point after being reflected.

[0014] On the other hand, an embodiment of the present application provides a projection screen, comprising a microstructure layer, wherein the microstructure layer has a reflective surface, and the reflective surface is formed by embossing any of the above-mentioned microstructure lens molds.

[0015] The reflective surface of the microstructure layer of the projection screen provided in the embodiment of the present application is formed by embossing the above-mentioned microstructure lens mold, which can solve the same technical problems as the above-mentioned microstructure lens mold and achieve the same technical effects, and will not be repeated here.

[0016] In another aspect, an embodiment of the present application provides a projection device, comprising a projector and the above-mentioned projection screen. The projector is located on one side of the projection screen and is used to project projection light toward the projection screen.

[0017] The projection device provided in the embodiment of the present application includes the above-mentioned projection screen, which can solve the same technical problems as the above-mentioned projection screen and achieve the same technical effects, and will not be repeated here.

[0018] On the other hand, the embodiment of the present application provides a method for making a microstructure lens mold, including the steps of: determining the size of the projection screen, the observation point, the projection ratio of the projector, and the eccentricity. Calculating the inclination angle and inclination direction that the reflective surface in the microstructure layer of the projection screen should correspond to when the projector is projected to different positions of the projection screen and then reflected to the observation point. According to the inclination angles and inclination directions of the multiple reflective surfaces, a plurality of microstructures for imprinting the reflective surface are made on the mold body.

[0019] In some embodiments, based on the inclination angles and inclination directions of multiple reflective surfaces, multiple microstructures for imprinting reflective surfaces are produced on the mold body, including: taking the position where the projector projects onto the projection screen and reflects to the observation point as the center position of the reflective surface, and producing microstructures at the corresponding positions on the mold body. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 A schematic diagram of the structure of a Fresnel lens layer in the related art;

[0021] Figure 2A schematic diagram of the optical path of the projection light reflected by the Fresnel lens layer in the related art;

[0022] Figure 3 A schematic diagram of the use status of the projection device provided in the embodiment of the present application;

[0023] Figure 4 A schematic diagram of the structure of a projection screen provided in an embodiment of the present application;

[0024] Figure 5 A schematic diagram of the structure of a microstructure layer provided in an embodiment of the present application;

[0025] Figure 6 A schematic diagram of a light path of a microstructure layer provided in an embodiment of the present application;

[0026] Figure 7 A schematic structural diagram of a microstructure lens mold provided in an embodiment of the present application;

[0027] Figure 8 It is a structural schematic diagram of the microstructure lens mold during processing;

[0028] Fig. 9 A schematic structural diagram of another microstructure lens mold provided in an embodiment of the present application;

[0029] Fig.10 A schematic structural diagram of another microstructure lens mold provided in an embodiment of the present application;

[0030] Fig.11 A schematic structural diagram of another microstructure lens mold provided in an embodiment of the present application;

[0031] Fig.12 Schematic diagram of the process of manufacturing a microstructure lens mold provided in the embodiment of the present application Figure 1 ;

[0032] Fig.13 Schematic diagram of the process of manufacturing a microstructure lens mold provided in the embodiment of the present application Figure 2 ;

[0033] Fig.14 for Figure 6 an orthographic view of the microstructure layer shown;

[0034] Fig.15 Schematic diagram of the structure of a single microstructure surface.

[0035] Reference numerals:

[0036] 010-Fresnel lens layer; 011-Fresnel microstructure;

[0037] 100-projection device; 1-projection screen; 11-surface layer; 12-microstructure layer; 121-reflection surface; 122-first plane; 13-reflection layer; 14-coloring layer; 15-diffusion layer; 151-diffusion particles; 2-projector; 21-incident light; 22-exiting light; 3-audience; 200-microstructure lens mold; 201-mold body; 202-microstructure; 203-structure surface. DETAILED DESCRIPTION

[0038] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0039] In the description of the present application, it should be understood that the terms, "up", "down", "left", "right", "front", "back", "inside", "outside", "center", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0040] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features.

[0041] In the description of this application, unless otherwise specified, " / " means "or", for example, A / B can mean A or B. "And / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, "at least one" means one or more, and "multiple" means two or more.

[0042] In the present application, unless otherwise clearly specified and limited, the term "connection" should be understood in a broad sense. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection or an indirect connection through an intermediate medium.

[0043] In the embodiments of the present application, the terms "include", "comprises" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0044] In the embodiments of the present application, words such as "exemplary" or "for example" are used to indicate examples, illustrations or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary" or "for example" is intended to present related concepts in a specific way.

[0045] In the field of projection display technology, especially in the field of ultra-short-throw laser projection display, in order to achieve better brightness and display effects, the projector can be used with a projection screen with a Fresnel lens layer, so that the projection screen has a certain ability to resist ambient light and enhance the user's viewing experience.

[0046] The key to the Fresnel lens layer lies in the processing and design of the Fresnel microstructure, such as Figure 1 As shown, Figure 1 The structure diagram of a Fresnel lens layer 010 of the related art is shown in FIG. 010 . The Fresnel lens layer 010 has a plurality of Fresnel microstructures 011 . The plurality of Fresnel microstructures 011 are a plurality of circular ring structures arranged concentrically. When the projection light passes through the Fresnel microstructures 011 , the light will converge toward the center under the action of the Fresnel microstructures 011 , so that the position facing the projection screen 1 has a better viewing effect.

[0047] Knowable, such as Figure 1 As shown, a single annular Fresnel microstructure 011 is distributed at different positions of the Fresnel lens layer 010, and the inclination angles of the inclined surfaces of the Fresnel microstructure 011 for reflecting light at various positions are generally the same.

[0048] However, the incident angles of the projection light projected onto the Fresnel lens layer 010 at different positions are different. Only a portion of the projection light projected onto the same Fresnel microstructure 011 can be reflected to the central area where the audience is watching, and most of the projection light will converge onto a larger plane. The overall convergence effect of the projection light is poor, and the picture effect cannot reach the best.

[0049] like Figure 2 As shown, Figure 2Schematic diagram of the optical path of the projection light reflected by the Fresnel lens layer 010 in the related art, the projection light a1 projected onto the central axis position of the Fresnel lens layer 010 can be reflected to the center point O. However, the projection light a2 projected onto the position outside the central axis of the Fresnel lens layer 010 cannot be reflected to the center point after reflection, and the light path after reflection deviates far from the center point O, and the light convergence effect is poor.

[0050] Based on this, the present application embodiment provides a projection device 100, see Figure 3 , Figure 3 The following is a schematic diagram of the use state of the projection device 100 provided in the embodiment of the present application. The projection device 100 may include a projection screen 1 and a projector 2. The projector 2 is located at one side of the projection screen 1 and is used to project projection light toward the projection screen 1.

[0051] like Figure 3 As shown, when the projection device 100 is in use, the projector 2 can be placed in front of and below the projection screen 1, and the audience 3 is located in front of the projection screen 1 and looks at the projection screen 1. The incident light 21 emitted by the projector 2 is directed toward the projection screen 1, and the incident light 21 is reflected by the projection screen 1 and finally forms an outgoing light 22 that is directed toward the audience 3, while forming an image on the projection screen 1.

[0052] Figure 3 The projector 2 shown may include a laser, which may be one of a monochromatic laser, a two-color laser, and a three-color laser. The three-color laser may emit a blue laser, a red laser, and a green laser. The wavelength range of the blue laser emitted by the laser may be set to 430nm-460nm, the wavelength range of the green laser emitted may be set to 500nm-540nm, and the wavelength range of the red laser emitted may be set to 610nm-650nm.

[0053] Since the three-color laser has the advantages of color authenticity and high color gamut, the laser in the projector 2 provided in the embodiment of the present application can be a three-color laser. Of course, the laser in the projector 2 provided in the embodiment of the present application can also be a monochromatic laser or a two-color laser.

[0054] The specific structure of the projection screen 1 provided in the embodiment of the present application is further described below. Figure 4 , Figure 4 The schematic diagram of the structure of a projection screen 1 provided in an embodiment of the present application is as follows: The projection screen 1 may include a surface layer 11, a microstructure layer 12 and a reflective layer 13 which are stacked in sequence.

[0055] like Figure 4As shown, the projector 2 is located on the side where the surface layer 11 of the projection screen 1 is located, and emits light toward the projection screen 1. The light passes through the interior of the projection screen 1 and is re-emitted from the surface layer 11.

[0056] The surface layer 11 can be used to protect the projection screen 1, so that the projection screen 1 is not easily damaged. The surface layer 11 can be made of a hard material to form a hard protective layer. For example, the surface layer 11 can be made of a methyl methacrylate-styrene copolymer (MS) material.

[0057] Of course, in other embodiments, the surface layer 11 may also be made of a flexible material so that the projection screen 1 can be rolled up for easy transportation. Exemplarily, the surface layer 11 may also be made of UV glue.

[0058] The reflective layer 13 is used to reflect light so that the light is re-emitted from the surface layer 11. It is understood that in order to enable the light to be reflected in the reflective layer 13, a reflective material is distributed in the reflective layer 13. Exemplarily, the reflective material can be aluminum, silver, or a combination of aluminum and silver.

[0059] The microstructure layer 12 can be used to converge light, so that the light projected by the projector 2 can be effectively reflected to the viewing area of ​​the audience 3, thereby improving the viewing effect of the audience 3. Figure 4 As shown, the microstructure layer 12 has a microstructure surface (i.e. Figure 4 The surface on the right side of the microstructure layer 12) and a first plane 122 arranged opposite to the microstructure surface.

[0060] The microstructure surface includes a plurality of reflective surfaces 121. The plurality of reflective surfaces 121 have different inclination angles and inclination directions relative to the first plane 122, and are respectively used to converge a portion of the projection light projected onto the reflective surfaces 121 to the same observation point.

[0061] Therefore, the projection screen 1 provided in the embodiment of the present application sets the reflection surface 121 with different inclination angles and inclination directions according to the relative position of the reflection surface 121 and the projector 2. When the projection light projected by the projector 2 is projected onto different reflection surfaces 121, part of the projection light converges to the same observation point, thereby ensuring the convergence effect of the projection light.

[0062] In addition, if Figure 5 As shown, Figure 5 The schematic diagram of the structure of a microstructure layer 12 provided in an embodiment of the present application is that a part of the reflection surface 121 passes through the same arc, wherein the arc can be the position corresponding to the arc-shaped Fresnel microstructure in the microstructure layer 12 .

[0063] Therefore, the projection screen 1 provided in the embodiment of the present application further subdivides the reflective surface 121, and designs corresponding inclination angles and inclination directions according to the different positions of the reflective surface 121 in the microstructure layer 12. When the projection light is projected onto different reflective surfaces 121 on the same arc of the microstructure layer 12, part of the projection light can be reflected to the observation point, and the overall convergence effect of the projection light is better.

[0064] For example, Figure 6 As shown, Figure 6 A schematic diagram of the optical path of a microstructure layer 12 provided in an embodiment of the present application shows that part of the incident light 21 projected onto the reflective surface 121 of the microstructure layer 12 outside the central axis can also be reflected to the observation point where the audience 3 is located after reflection.

[0065] Optionally, the vertical projection of the observation point on the microstructure layer 12 may be located at the center of the microstructure layer 12. In this way, the audience 3 may have a better viewing effect when facing the projection screen 1.

[0066] In some embodiments, Figure 4 As shown, the projection screen 1 may further include a coloring layer 14. Dark dye is distributed in the coloring layer 14. When external ambient light passes through the coloring layer 14, it will be absorbed by the dark dye, thereby improving the contrast of the projection screen 1.

[0067] In some embodiments, Figure 4 As shown, the projection screen 1 may further include a diffusion layer 15. Diffusion particles 151 are distributed in the diffusion layer 15. Light diffuses when passing through the diffusion particles 151, thereby increasing the viewing angle of the projection screen 1. Of course, in order to ensure the convergence effect of the light of the projection screen 1, the projection screen 1 may not be provided with the diffusion layer 15.

[0068] In order to manufacture the above-mentioned microstructure layer 12, the present application embodiment also provides a microstructure lens mold, such as Figure 7 As shown, Figure 7 This is a schematic structural diagram of a microstructure lens mold 200 provided in an embodiment of the present application. The microstructure lens mold 200 includes a mold body 201 .

[0069] like Figure 7 As shown, the mold body 201 has a plurality of microstructures 202. The microstructures 202 have a structure surface 203, and the structure surface 203 is an inclined surface.

[0070] The plurality of microstructures 202 are used to emboss the surface of one side of the microstructure layer 12 to form the above-mentioned microstructure surface. Figure 5As shown, the multiple reflective surfaces 121 of the microstructure layer 12 can be formed by embossing multiple structure surfaces 203. For example, the microstructure layer 12 can be made of UV adhesive material, and the UV adhesive material is directly embossed during the manufacturing process to form the above microstructure layer 12.

[0071] Therefore, the microstructure lens mold 200 provided in the embodiment of the present application can be used to form a microstructure layer 12, and the multiple reflective surfaces 121 of the microstructure layer can respectively converge part of the projection light projected onto the reflective surfaces 121 to the same observation point, so that the formed microstructure layer 12 has a better convergence effect.

[0072] At the same time, since the formed partial reflection surface 121 passes through the same arc, the microstructure surface of the microstructure layer 12 can make the light projected onto the reflection surface 121 at different positions on the same arc converge to the observation point, ensuring the light convergence effect.

[0073] It is understandable that if Figure 4 As shown, the reflective layer 13 may be disposed on the reflective surface 121 so that the light can be reflected after reaching the reflective surface 121 and emitted out of the projection screen 1 from the side where the projector 2 is located.

[0074] In some embodiments, the projection light projected to the center position of the reflective surface 121 converges to the same observation point after reflection. In this way, the projection light projected to the reflective surface 121 is based on the center position, so that the projection light projected to the reflective surface 121 can be more effectively converged to the vicinity of the observation point after reflection. Of course, in other embodiments, the projection light converged to the observation point after reflection can also be reflected at other positions of the reflective surface 121.

[0075] When designing the inclination angle of the reflecting surface 121, the center position of the reflecting surface 121 can be determined first, and then the center position can be used as a reference to calculate the corresponding inclination angle and inclination direction when the projection light passes through the center position and is reflected to the observation point, and the microstructure 202 of the microstructure lens mold 200 can be designed accordingly based on this angle.

[0076] The mold body 201 of the microstructure lens mold 200 provided in the embodiment of the present application can have different shapes. In some embodiments, for example Figure 7 As shown, the mold body 201 can be in a plate shape. In this case, the overall structure of the mold body 201 is relatively simple, which is convenient for manufacturing and production. At the same time, when the mold body 201 is used to make the microstructure layer 12, the microstructure layer 12 can be formed by direct embossing, which is also convenient for manufacturing the microstructure layer 12.

[0077] It is understandable that the mold body 201 can be processed and produced in different ways. For example, when manufacturing the mold body 201, it can be manufactured on the surface of one side of the plate-shaped mold body 201 by mechanical processing, photolithography or inkjet printing, etc. The processing methods are diverse, simple and convenient.

[0078] For example, Figure 8 As shown, Figure 8 The schematic diagram of the structure of the microstructure lens mold during processing is shown in FIG. 3 . The tool 300 is rotated along its own axis direction A to adjust the cutting angle. Figure 8 The tool 300 can be moved in the X direction and the Y direction to process the microstructure 202 by adjusting the feed depth.

[0079] When photolithography is used, the laser beam can be used as a processing tool to perform laser etching on the mold body 201, and the processing process is similar to mechanical processing. When inkjet printing is used, UV glue can be sprayed layer by layer onto the mold surface by an inkjet printer to solidify and form the microstructure 202.

[0080] In other embodiments, Fig. 9 As shown, Fig. 9 This is a schematic diagram of the structure of another microstructure lens mold 200 provided in an embodiment of the present application, wherein the mold body 201 may also be cylindrical. In this case, a structural surface 203 is formed on the side of the mold body 201 .

[0081] based on Fig. 9 The solution shown can facilitate continuous production and improve production efficiency when using the mold body 201 to make the microstructure layer 12. When the mold body 201 is cylindrical, the mold body 201 can also be made by mechanical processing.

[0082] Understandably, Figure 7 and Fig. 9 The microstructure lens mold 200 shown is only used as a schematic diagram for explanation and does not represent the actual structure of the microstructure lens mold 200 .

[0083] In some embodiments, Figure 5 As shown, along the first direction X, a plurality of reflective surfaces 121 are arranged in a plurality of rows, and each row has a plurality of reflective surfaces 121 arranged along the second direction Y. The first direction X and the second direction Y are perpendicular to each other, and both the first direction X and the second direction Y are perpendicular to the first plane 122 ( Figure 4 ) vertically. For example, Figure 5 As shown, the microstructure layer 12 is generally rectangular, the first direction X may be the width direction of the microstructure layer 12 , and the second direction Y may be the width direction of the microstructure layer 12 .

[0084] When the reflecting surface 121 is Figure 5 When the arrangement is performed in the manner shown, the production of the microstructure lens mold 200 can be made more convenient and simple. Figure 7 As shown, when the mold body 201 is a rectangular flat plate, the multiple microstructures 202 can be arranged along the length direction and the width direction of the mold body 201. In this way, when making the microstructure 202, it is only necessary to make the multiple microstructures 202 in the above two directions.

[0085] Or, if Fig. 9 As shown, when the mold body 201 is cylindrical, the plurality of microstructures 202 can be arranged along the height direction of the cylinder and the circumference direction of the bottom surface. In this way, during production, it is only necessary to produce in the above two directions.

[0086] In some embodiments, Figure 7 and Fig. 9 As shown, the shape of the structural surface 203 can be a polygon. Figure 5 As shown, there are multiple structural surfaces 203 ( Figure 7 ) The distribution of the reflective surface 121 formed by embossing is more reasonable, and there is less likely to be a gap between the multiple reflective surfaces 121, so that the projection light can be projected onto the reflective surface 121 for reflection, ensuring the utilization rate of the projection light. At the same time, when the shape of the structure surface 203 is a polygon, the design of the microstructure 202 is also relatively simple, which is convenient for processing.

[0087] It is understandable that the specific shape of the structural surface 203 can be selected according to actual conditions. Figure 7 and Fig. 9 As shown, the shape of the structural surface 203 can be a rectangle. Figure 5 As shown, the reflective surface 121 formed by embossing the structure surface 203 is also rectangular.

[0088] Or, if Fig.10 and Fig.11 As shown, Fig.10 This is a schematic structural diagram of another microstructure lens mold 200 provided in an embodiment of the present application. Fig.11 This is a schematic structural diagram of another microstructure lens mold 200 provided in an embodiment of the present application. The shape of the structural surface 203 may also be a triangle or a hexagon.

[0089] Of course, the shape of the structural surface 203 may not be a polygon. For example, the shape of the structural surface 203 may also be a circle or an arc, which can be designed according to actual conditions, and is only described as an example here.

[0090] In some embodiments, the shapes of the plurality of structural surfaces 203 may be the same. Fig.10 and Fig.11 As shown, the shapes of the structural surfaces 203 can all be regular hexagons or triangles of the same size. Of course, the shapes of the structural surfaces 203 can also be different.

[0091] As can be seen from the above, the projection light can be reflected to the observation point after being projected to a certain point on the reflection surface 121. The farther the projection light is from the above point on the reflection surface 121, the farther it deviates from the observation point after reflection.

[0092] Therefore, in order to ensure the focusing effect of the projected light, in some embodiments, the length of the side edges of the structure surface 203 may be less than 200 um. At this time, the length of the side edges of the reflective surface 121 formed by embossing the structure surface 203 is also less than 200 um.

[0093] In this way, the size of each reflecting surface 121 is small, and the distance between the point on the reflecting surface 121 that can reflect the observation point and other points on the reflecting surface 121 is small, so that the projection light projected onto each reflecting surface 121 can be better concentrated near the observation point after reflection, and the light effect is better.

[0094] It is understandable that when the length of the side of the structure surface 203 is too long, the length of the side of the embossed reflective surface 121 is also large. At this time, the range of light reflected from each reflective surface 121 and focused around the observation point is also increased, which reduces the light gathering effect.

[0095] In addition, the length of the side of the structural surface 203 can be selected according to actual conditions. For example, when the structural surface 203 is a regular polygon, the length of the side of the structural surface 203 can be 200um, 190um, 180um, 150um, 100um or 50um, etc. Of course, the length of the side of the structural surface 203 can also be other values, which are only described as examples here.

[0096] When the length of the side of the structure surface 203 is too small, the microstructure layer 12 of the same size has more reflective surfaces 121, and the light can be more focused near the observation point. At the same time, the number of structure surfaces 203 of the microstructure lens mold 200 is also large, and the manufacturing accuracy and difficulty will increase accordingly.

[0097] Therefore, in actual application, the size of the structure surface 203 can be determined according to actual conditions. For example, when it is necessary to ensure that the microstructure layer 12 has a better light converging effect, the size of the structure surface 203 can be designed to be relatively small, so that the light projected onto each reflection surface 121 can be converged into a smaller range near the observation point.

[0098] When the requirement for the light convergence effect is relatively low, the size of the structure surface 203 can be designed to be relatively large, so that the number of microstructures 202 of the microstructure lens mold 200 is small, which facilitates the production of the microstructure 202 lens mold 200.

[0099] The present application also provides a method for making a microstructure lens mold. Fig.12 As shown, Fig.12 Schematic diagram of the process of manufacturing a microstructure lens mold provided in the embodiment of the present application Figure 1 , including steps S100 to S300.

[0100] S100: Determine the size of the projection screen, the observation point, the throw ratio and the off-axis of the projector.

[0101] According to the above data, the projection point of the projector relative to the projection screen can be determined, so that the projection light and the reflected light projected by the projector to the corresponding position of the projection screen can be obtained.

[0102] S200: Calculating the inclination angle and inclination direction that the reflection surface in the microstructure layer of the projection screen should correspond to when the projector projects light to different positions of the projection screen and then reflects to the observation point.

[0103] According to the law of reflection, after the projection light and the reflected light are determined, the inclination angle and the inclination direction of the reflection surface can be determined based on the projection light and the reflected light.

[0104] It is understandable that after the projection light and the incident light are reflected by the reflective surface, the angles between the projection light and the incident light and the normal line of the reflective surface are the same. The normal line of the reflective surface and the reflective surface are perpendicular to each other, so the inclination angle and inclination direction of the reflective surface can be determined.

[0105] S300: According to the inclination angles and inclination directions of the multiple reflective surfaces, a plurality of microstructures for imprinting the reflective surfaces are manufactured on the mold body.

[0106] After determining the inclination angle and inclination direction corresponding to the reflective surface at each position in the microstructure layer, mechanical processing or the like can be used to manufacture the corresponding microstructure capable of imprinting the corresponding reflective surface on the mold body according to the calculated inclination angle and inclination direction, thereby completing the manufacture of the microstructure lens mold.

[0107] In some embodiments, Fig.13 Schematic diagram of the process of manufacturing a microstructure lens mold provided in the embodiment of the present application Figure 2 According to the inclination angles and inclination directions of the multiple reflective surfaces, a plurality of microstructures for imprinting the reflective surfaces are manufactured on the mold body, including step S301.

[0108] S301: The position where the projector is projected onto the projection screen and then reflected to the observation point is taken as the center position of the reflection surface, and a microstructure is manufactured at the corresponding position on the mold body. In this way, the reflection surface formed by the manufactured microstructure is printed, and the light projected by the projector is reflected to the observation point at the center position of the reflection surface, so that the projection light projected to other positions of the reflection surface can be gathered near the periphery of the observation point after reflection, and the gathering effect is better.

[0109] Below, Figure 6 Taking the microstructure layer shown in FIG. 1 as an example, the determination of the inclination angle and the inclination direction of the reflective surface is described as an example. The length of the microstructure layer is L and the height is H. Fig.14 As shown, Fig.14 for Figure 6 In the orthographic projection view of the microstructure layer 12 shown, the projection of the reflective surface 121 on the first plane is a square with a length of d.

[0110] At this time, if Fig.15 As shown, Fig.15 1 is a schematic diagram of the structure of a single microstructure surface 121. The microstructure surface 121 has two inclination angles α and β relative to the first plane 122. Fig.14 , Fig.14 The XY coordinate plane shown is parallel to the first plane and passes through a reflection point on the reflection surface 121 , and the coordinates of the reflection point are (x, y, 0).

[0111] The origin is located at Fig.14 The center position of the lower side length of the microstructure layer 12 is shown. Then the coordinates of the two non-parallel vectors in the plane where the reflection surface is located can be a1 (d, 0, dtanα) and a2 (0, d, dtanβ).

[0112] Reference Figure 6 Taking a projector with an eccentricity of m and a projection ratio of n as an example, the coordinates of the incident point O are (0, -(m-1)H / 2, nL), and the incident light is reflected at (x, y, 0) and converges to the coordinate point (0, H / 2, D).

[0113] Based on the above data, the vector coordinates of the incident light can be expressed as (x, y+(m-1)H / 2, -nL), and the vector coordinates of the reflected light can be expressed as (-x, H / 2-y, D). From this, the unit vector n1 of the incident light can be calculated as The unit vector n2 of the reflected light is The normal vector of the plane is the angle bisector n3 of the unit vectors n1 and n2, and its vector is

[0114]

[0115] According to the law of reflection, n3, a1 and a2 satisfy: n3·a1=0; n3·a2=0, that is:

[0116]

[0117]

[0118]

[0119] Thus, the above formula can be used to calculate the size of α and β, and then calculate the tilt angle and tilt direction of a single reflective surface, and according to this result, the corresponding microstructure can be made on the mold body. Then, after calculating the tilt angles and tilt directions of the reflective surfaces at other positions in turn according to the above method, the microstructure lens mold can be made according to the above results.

[0120] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A microstructure lens mold, characterized in that: include: The mold body has a plurality of microstructures; the microstructures have structure surfaces, and the structure surfaces is an inclined surface; The plurality of microstructures are used to emboss the surface of one side of the microstructure layer to form a microstructure surface; the microstructure surface includes a plurality of reflective surfaces formed by embossing the structure surface; Among them, the microstructure layer also has a first plane arranged opposite to the microstructure surface; the inclination angles and inclination directions of the multiple reflection surfaces relative to the first plane are different, and some of the reflection surfaces pass through the same arc; the multiple reflection surfaces are respectively used to converge part of the projection light projected onto the reflection surfaces to the same observation point.

2. The microstructure lens mold according to claim 1, characterized in that: Along the first direction, the plurality of reflecting surfaces are arranged in a plurality of rows, and each row has a plurality of reflecting surfaces arranged along the second direction; The first direction and the second direction are perpendicular to each other, and both the first direction and the second direction are parallel to the first plane.

3. The microstructure lens mold according to claim 1, characterized in that: The shape of the structural surface is a polygon.

4. The microstructure lens mold according to claim 3, characterized in that: The lengths of the side edges of the structural surface are all less than or equal to 200um.

5. The microstructure lens mold according to claim 1, characterized in that: The mold body is plate-shaped or cylindrical.

6. The microstructure lens mold according to any one of claims 1 to 5, characterized in that: The projection light projected onto the center position of the reflection surface converges to the same observation point after reflection; and / or, The vertical projection of the observation point on the microstructure layer is located at the center of the microstructure layer.

7. A projection screen, characterized in that: The invention comprises a microstructure layer; the microstructure layer has a reflective surface; the reflective surface is formed by embossing the microstructure lens mold according to any one of claims 1 to 6.

8. A projection device, characterized in that: It comprises a projector and the projection screen as claimed in claim 7; the projector is located at one side of the projection screen, and is used to project projection light toward the projection screen.

9. A method for manufacturing a microstructure lens mold according to any one of claims 1 to 6, characterized in that: include: determining the size of the projection screen, the observation point, the throw ratio of the projector, and the off-axis of the projector; Calculating the inclination angle and inclination direction that the reflective surface in the microstructure layer of the projection screen should correspond to when the projector projects to different positions of the projection screen and then reflects to the observation point; According to the inclination angles and inclination directions of the plurality of reflecting surfaces, a plurality of microstructures for imprinting the reflecting surfaces are manufactured on the mold body.

10. The method for manufacturing a microstructure lens mold according to claim 9, characterized in that: According to the inclination angles and inclination directions of the plurality of reflection surfaces, manufacturing a plurality of microstructures for imprinting the reflection surfaces on the mold body comprises: The position where the light projected by the projector onto the projection screen is reflected to the observation point is taken as the center position of the reflection surface, and the microstructure is manufactured at the corresponding position on the mold body.

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