Spliced holographic film and manufacturing method thereof

Abstract

The invention discloses a spliced holographic film and a manufacturing method thereof. The spliced holographic film comprises a base material; the holographic information layer is located on the base material and comprises a splicing unit array, and splicing units in the splicing unit array are arranged in a staggered mode. The manufacturing cost of the holographic film can be reduced, and meanwhile the rainbow fringe phenomenon can be restrained.

Description

Technical Field

[0001] The embodiments of the present application relate to the field of holographic optical technology, and in particular to a spliced ​​holographic film and a method for manufacturing the same. Background Art

[0002] Holographic technology is a technology that uses the principles of interference and diffraction to record and reproduce, including plane holography and volume holography. Volume holographic optical elements are diffraction optical elements that only diffract incident light that meets the Bragg conditions, and directly transmit incident light that does not meet the Bragg conditions. They have broad application prospects in display and other fields. Volume holographic optical elements are thin-film optical elements, which can also be called holographic films. Holographic films are usually made by holographic photography. In the process of making holographic films, a beam of parallel light and a beam of divergent light are usually used to illuminate the material for making the holographic film. The parallel light beam interferes with the divergent light beam to form interference fringes on the material for making the holographic film. The parallel light beam needs to be collimated by a collimating lens. Therefore, the size of the holographic film to be made will directly determine the size of the collimating lens in the optical path. In some application scenarios that require large-format holographic films, large-aperture collimating lenses are required.

[0003] However, large-aperture collimating lenses are usually expensive, which not only increases the production cost of large-format holographic films, but also hinders the application of large-format holographic films.

[0004] Therefore, the related art proposes a volume holographic optical element, including a substrate layer and a holographic information layer located on the substrate layer, and the holographic information layer includes a pixel unit array. In the process of manufacturing the volume holographic optical element, two fine light beams are used to irradiate the material for manufacturing the holographic film, and the two fine light beams interfere to form interference fringes on the holographic information layer, thereby forming a pixel unit, and by moving the material for manufacturing the holographic film, the formed pixel unit is moved away from the area irradiated by the two fine light beams, and the area in the holographic information layer where the pixel unit is not formed is moved to the area irradiated by the two fine light beams, and the pixel unit is manufactured until the entire holographic information layer is traversed to form a pixel unit array.

[0005] Although the production of such a volume holographic optical element can avoid the use of a large-aperture collimating lens, thereby reducing the production cost of the holographic film and promoting the application of the holographic film, the pixel units in the pixel unit array of such a volume holographic optical element are regularly arranged, which will produce a strong diffraction effect, causing the display of the volume holographic optical element to have a rainbow stripe phenomenon, which affects the display effect of the volume holographic optical element. Summary of the invention

[0006] The spliced ​​holographic film and the method for manufacturing the same provided by the embodiments of the present application can solve or partially solve the above-mentioned deficiencies in the prior art or other deficiencies in the prior art.

[0007] According to a first aspect of the present application, there is provided a spliced ​​holographic film, comprising: a substrate; and a holographic information layer, located on the substrate, comprising a splicing unit array, wherein the splicing units in the splicing unit array are staggered.

[0008] In one embodiment of the present application, the splicing units in the splicing unit array are randomly staggered.

[0009] In one embodiment of the present application, the shape of the splicing unit includes a rectangle, and the side length of the rectangular splicing unit is greater than 30um and less than 1000um.

[0010] In one embodiment of the present application, the sizes of the splicing units in the splicing unit array are the same or different.

[0011] In one embodiment of the present application, the misalignment between two adjacent splicing units in the splicing unit array is not greater than 10% of the minimum side length of the splicing unit.

[0012] In one embodiment of the present application, the misalignment amounts between two adjacent splicing units in the splicing unit array are the same or different.

[0013] In one embodiment of the present application, a splicing gap is provided between two adjacent splicing units in the splicing unit array, and a width of the splicing gap is not greater than 10% of the minimum side length of the splicing unit.

[0014] In one embodiment of the present application, widths of the splicing gaps between two adjacent splicing units in the splicing unit array are the same or different.

[0015] In one embodiment of the present application, all the splicing units in the splicing unit array have the same focus for parallel incident light.

[0016] In one embodiment of the present application, the holographic information layer comprises a photopolymer that is transparent in the visible light range.

[0017] In one embodiment of the present application, the substrate comprises glass or plastic that is transparent in the visible light range.

[0018] According to a second aspect of the present application, a method for manufacturing a spliced ​​holographic film is provided, which is used to manufacture the spliced ​​holographic film described in the first aspect, and the method comprises: moving a movable platform in a horizontal direction and / or a vertical direction to move a target area of ​​a target material placed on the movable platform to an illumination position; wherein the target material comprises a substrate and a holographic information layer located on the substrate; collimating a target light beam through a centimeter-level collimating lens to obtain a parallel light beam, irradiating the target area with the parallel light beam and a divergent light beam, wherein the parallel light beam and the divergent light beam interfere with each other to form a splicing unit in the holographic information layer in the target area; and continuing to execute the step of moving the movable platform in a horizontal direction and / or a vertical direction until the target material is traversed to form a splicing unit array in the holographic information layer, wherein the splicing units in the splicing unit array are arranged in a staggered manner by controlling the distance that the movable platform moves in the horizontal direction and / or the vertical direction each time.

[0019] In one embodiment of the present application, it also includes: controlling the size of the splicing unit in the splicing unit array by controlling the size of the light spot formed each time the parallel light beam and the divergent light beam interfere with each other.

[0020] In one embodiment of the present application, it further includes: by controlling the distance that the movable platform moves each time along the horizontal direction and / or the vertical direction, a splicing gap is provided between two adjacent splicing units in the splicing unit array.

[0021] According to the splicing holographic film and its manufacturing method of the implementation mode of the present application, by forming a splicing unit array in the holographic information layer, the production of a large-format holographic film can be converted into the production of multiple small-format splicing units, thereby avoiding the use of large-aperture collimating lenses in the process of manufacturing the holographic film, reducing the production cost of the holographic film, and promoting the application of the holographic film; by staggering the splicing units in the splicing unit array, the diffraction effect can be weakened, the rainbow stripe phenomenon can be suppressed, and a better display effect can be obtained.

[0022] The content described in this section is not intended to identify the key or important features of the embodiments of the present disclosure, nor is it intended to limit the scope of the present disclosure. Other features of the present disclosure will become easily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Other features, purposes and advantages of the present application will become more apparent by reading the detailed description of the non-limiting embodiments made with reference to the following drawings. The drawings are used to better understand the present solution and do not constitute a limitation of the present application. Among them:

[0024] Figure 1AIt is a schematic diagram of the optical path of the holographic film produced by the related technology;

[0025] Figure 1B is a schematic diagram of interference fringes of a holographic film produced by a related technology;

[0026] Figure 2A is a partial schematic diagram of the composition structure of a spliced ​​holographic film according to an embodiment of the present application;

[0027] Figure 2B is a schematic diagram of a splicing unit array according to an embodiment of the present application;

[0028] Figure 2C is a schematic diagram of two adjacent splicing units in a splicing unit array according to an embodiment of the present application;

[0029] Figure 2D and Figure 2E is a schematic diagram of the optical characteristics of a spliced ​​holographic film according to an embodiment of the present application;

[0030] Figure 3A is a schematic diagram of the optical path for making the spliced ​​holographic film of the embodiment of the present application;

[0031] Figure 3B It is a schematic diagram of the staggered arrangement of the splicing units on the movable platform;

[0032] Figure 3C It is a schematic diagram of the regular arrangement of the splicing units on the movable platform;

[0033] Figure 3D yes Figure 3B The simulated diffraction effect diagram of the arrangement of the splicing units;

[0034] Figure 3E yes Figure 3C The simulated diffraction effect diagram of the arrangement of the splicing units;

[0035] Figure 4A is a schematic diagram of the focus of a spliced ​​holographic film according to an embodiment of the present application;

[0036] Figure 4B is a schematic diagram of imaging of a spliced ​​holographic film according to an embodiment of the present application;

[0037] Figure 5 is a schematic diagram of a splicing unit array according to an embodiment of the present application;

[0038] Figure 6 is a schematic diagram of a splicing unit array according to another embodiment of the present application;

[0039] Figure 7It is a flow chart of a method for producing a spliced ​​holographic film according to an embodiment of the present application. DETAILED DESCRIPTION

[0040] The following is a description of exemplary embodiments of the present application in conjunction with the accompanying drawings, including various details of the embodiments of the present application to facilitate understanding, which should be considered as merely exemplary. Therefore, it should be recognized by those of ordinary skill in the art that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present application. Similarly, for the sake of clarity and conciseness, the description of well-known functions and structures is omitted in the following description.

[0041] In the drawings, the thickness, size and shape of the components have been slightly adjusted for ease of illustration. The drawings are for illustration only and are not drawn strictly to scale. As used herein, the terms "substantially," "approximately," and similar terms are used as terms of approximation, not as terms of degree, and are intended to account for the inherent deviations in measurements or calculations that would be recognized by one of ordinary skill in the art.

[0042] It should also be understood that expressions such as "include", "including", "have", "contain" and / or "comprising" are open rather than closed expressions in this specification, which indicate the presence of the stated features, elements and / or components, but do not exclude the presence of one or more other features, elements, components and / or combinations thereof. In addition, when expressions such as "at least one of..." appear after a list of listed features, they modify the entire list of features rather than just the individual elements in the list. In addition, when describing embodiments of the present application, "may" is used to mean "one or more embodiments of the present application". And, the term "exemplary" is intended to refer to an example or illustration.

[0043] Unless otherwise specified, all words (including engineering terms and scientific and technological terms) used in this article have the same meaning as those commonly understood by ordinary technicians in the field to which this application belongs. It should also be understood that, unless clearly stated in this application, words defined in common dictionaries should be interpreted as having the same meaning as their meaning in the context of the relevant technology, and should not be interpreted in an idealized or overly formal sense.

[0044] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments in this application can be combined with each other. In addition, unless explicitly limited or contradictory to the context, the specific steps included in the method recorded in this application are not necessarily limited to the recorded order, but can be performed in any order or in parallel.

[0045] In addition, those skilled in the art will appreciate that the quantities shown in the drawings and below of the present application, such as the number of light films, are only shown for ease of illustration, and the specific quantities may be set according to actual needs without departing from the teachings of the disclosure of the present application.

[0046] Holographic technology is a technology that uses the principles of interference and diffraction to record and reproduce, including plane holography and volume holography. Volume holographic optical elements are diffraction optical elements that only diffract incident light that meets the Bragg conditions and directly transmit incident light that does not meet the Bragg conditions. They have broad application prospects in display and other fields. Volume holographic optical elements are thin-film optical elements, which can also be called holographic films. Holographic films are usually made by holographic photography.

[0047] like Figure 1A As shown, in the process of making a holographic film, a beam of parallel light 130 and a beam of divergent light 150 are usually used to illuminate the material 140 for making the holographic film. The parallel light beam and the divergent light beam interfere with each other to form interference fringes on the material for making the holographic film, such as Figure 1B As shown, the parallel light beam needs the light beam 110 to be collimated by the collimating lens 120. Therefore, Figure 1A As shown, the size of the holographic film to be produced will directly determine the size of the collimating lens in the optical path. In some application scenarios that require large-format holographic films, such as augmented reality head-up display (AR-HUD), the required holographic film format can reach more than 300mm, and a large-diameter collimating lens is required. Since the edge aberration of the geometric optical lens is relatively serious, in order to suppress the influence of the edge aberration of the lens and obtain a holographic film with good performance, the aperture of the collimating lens in the holographic shooting optical path is usually made larger than the format of the holographic film to be produced. For example, when producing a holographic film with a format of 300mm, it is usually necessary to use a collimating lens with a diameter greater than or equal to 400mm.

[0048] The large-aperture collimating lenses used in the existing large-format holographic film production process are usually expensive, which not only increases the production cost of the large-format holographic film, but also hinders the application of the large-format holographic film.

[0049] Therefore, the related art proposes a volume holographic optical element, including a substrate layer and a holographic information layer located on the substrate layer, and the holographic information layer includes a pixel unit array. In the process of manufacturing the volume holographic optical element, two fine light beams are used to irradiate the material for manufacturing the holographic film, and the two fine light beams interfere to form interference fringes on the holographic information layer, thereby forming a pixel unit, and by moving the material for manufacturing the holographic film, the formed pixel unit is moved away from the area irradiated by the two fine light beams, and the area in the holographic information layer where the pixel unit is not formed is moved to the area irradiated by the two fine light beams, and the pixel unit is manufactured until the entire holographic information layer is traversed to form a pixel unit array.

[0050] Although this volume holographic optical element converts the production of a large-format holographic film into the production of multiple small-format pixel units, it can avoid the use of a large-aperture collimating lens in the process of making the holographic film, which can reduce the production cost of the holographic film and promote the application of the holographic film. However, the pixel units in the pixel unit array of this volume holographic optical element are regularly arranged, which will produce a strong diffraction effect, so that the display of the volume holographic optical element has a rainbow stripe phenomenon, which affects the display effect of the volume holographic optical element.

[0051] In order to solve the above problems, an embodiment of the present application provides a spliced ​​holographic film 200 .

[0052] Figure 2A A partial schematic diagram of the composition structure of the spliced ​​holographic film 200 according to an embodiment of the present application is shown. Figure 2B Schematic diagram of a splicing unit array 230 according to an embodiment of the present application is shown. Figure 2C FIG. 2 shows a schematic diagram of two adjacent splicing units 231 and 232 in a splicing unit array 230 according to an embodiment of the present application. Figure 2D and Figure 2E Schematic diagram showing the optical properties of the spliced ​​holographic film 200 according to an embodiment of the present application. Figure 2A and Figure 2B As shown, the spliced ​​holographic film 200 of the embodiment of the present application may include: a substrate 210 and a holographic information layer 220 located on the substrate 210. The substrate 210 serves as a support layer of the spliced ​​holographic film 200, and the holographic information layer 220 may include a splicing unit array 230. The splicing unit array 230 may include a plurality of splicing units 2311, 2312, 2313, and 2314. The plurality of splicing units 2311, 2312, 2313, and 2314 are staggered in the splicing unit array 230. For the convenience of explanation, Figure 2BOnly four splicing units 2311, 2312, 2313, and 2314 are marked in the splicing unit array 230, and other unmarked splicing units in the splicing unit array 230 have the same characteristics as the marked four splicing units 2311, 2312, 2313, and 2314. Figure 2C As shown, each splicing unit 2311, 2312 in the splicing unit array 230 has interference fringes 2311a, 2312a, and the interference fringes 2311a, 2312a may have the following optical properties: diffracting the incident light 310 that meets the Bragg condition, such as Figure 2D As shown; and the incident light 320 that does not meet the Bragg condition is directly transmitted, such as Figure 2E shown.

[0053] Figure 3A FIG. 2 shows a schematic diagram of the optical path for making the spliced ​​holographic film 200 according to the embodiment of the present application. Figure 3B FIG. 4 shows a schematic diagram of the staggered arrangement of the splicing units on the movable platform 450. Figure 3A and Figure 3B As shown, in the process of manufacturing the spliced ​​holographic film 200 of the embodiment of the present application, the material 440 for manufacturing the spliced ​​holographic film 200 may be placed on the movable platform 450, wherein the material 440 for manufacturing the spliced ​​holographic film 200 may include a substrate 210 and a holographic information layer 220 located on the substrate 210. Then, a centimeter-level collimating lens 420 is used to collimate the light beam 410 to obtain a parallel light beam 430, and the parallel light beam 430 and the divergent light beam 460 are used to irradiate the material 440 on the movable platform 450, and the parallel light beam 430 and the divergent light beam 460 interfere with each other, and the holographic information layer 220 in the irradiated area of ​​the material 440 forms a splicing unit 2321 with interference fringes. Then, the movable platform 450 is moved along the horizontal direction x and / or the vertical direction y, and the area in the holographic information layer 220 of the material 440 where no splicing unit is formed is moved to the illumination position, and the splicing unit is produced, until the material 440 on the movable platform 450 is traversed to form the splicing unit array 230 on the holographic information layer 220. By controlling the distance that the movable platform 450 moves along the horizontal direction x and / or the vertical direction y each time, the splicing units 2321, 2322, 2323, and 2324 in the splicing unit array 230 can be arranged in a staggered manner.

[0054] Figure 3C A schematic diagram showing a regular arrangement of splicing units on a movable platform 450 is shown. Figure 3D Shows Figure 3B The simulated diffraction effect diagram of the arrangement of the splicing units. Figure 3E Shows Figure 3CThe simulated diffraction effect diagram of the arrangement of the splicing units in the image. Since the interaction between the splicing units will cause diffraction, the rainbow stripe phenomenon is a manifestation of diffraction, that is, the stronger the diffraction effect, the more serious the rainbow stripes. In order to obtain a better display effect, it is necessary to suppress the rainbow stripe phenomenon. Therefore, it is necessary to weaken the diffraction effect, destroy the conditions for diffraction, and make differences between the splicing units. Figure 3B In the spliced ​​holographic film shown, the splicing units 2321, 2322, 2323, and 2324 are arranged in a staggered manner, that is, there is a staggered situation between adjacent splicing units. Figure 3C The splicing units 2321', 2322', 2323', and 2324' in the spliced ​​holographic film are arranged regularly, that is, the adjacent splicing units are completely aligned and there is no misalignment. Figure 3B and Figure 3C The diffraction effects of the two spliced ​​holographic films are simulated, such as Figure 3D and Figure 3E As shown. Among them, Figure 3D There is no obvious diffraction effect. Figure 3E A stronger diffraction effect occurs. Figure 3C Each splicing unit shown is a splicing holographic film arranged regularly. Figure 3B The spliced ​​holographic film with staggered arrangement of each splicing unit shown has obvious advantages in suppressing the rainbow fringe phenomenon.

[0055] The spliced ​​holographic film 200 provided in the embodiment of the present application can convert the production of a large-format holographic film into the production of multiple small-format splicing units by forming a splicing unit array 230 on the holographic information layer 220, thereby avoiding the use of a large-aperture collimating lens in the process of producing the holographic film, reducing the production cost of the holographic film, and promoting the application of the holographic film; by staggering the splicing units in the splicing unit array 230, the diffraction effect can be weakened, the rainbow stripe phenomenon can be suppressed, and a better display effect can be obtained.

[0056] It should be understood that the substrate 210 in the embodiments of the present application may be a material that is transparent in the visible light range, that is, a material with good optical transmittance. For example, the substrate 210 may include glass or plastic that is transparent in the visible light range, and the embodiments of the present application are not limited to this.

[0057] It should be understood that the holographic information layer 220 in the embodiments of the present application may be a holographic photosensitive material that is transparent in the visible light range. For example, the holographic information layer 220 may include a photopolymer that is transparent in the visible light range, etc. The embodiments of the present application are not limited to this.

[0058] It should be understood that the embodiments of the present application are described using a splicing unit array 230 arranged in a rectangular shape, but the splicing unit array of the embodiments of the present application is not limited to a rectangle. For example, the splicing unit array of the embodiments of the present application may also be other shapes such as a rhombus or a parallelogram.

[0059] It should be understood that the number, shape, size, staggered arrangement, etc. of the splicing units in the splicing unit array 230 in the embodiments of the present application can be determined according to actual needs, and the embodiments of the present application do not limit this.

[0060] It should be understood that in the embodiments of the present application, the divergent light beam 460 that forms the interference fringes, the light beam 410 that obtains the parallel light beam 430 through the collimating lens 420, and the specifications of the collimating lens 420 can be determined according to actual needs, and the embodiments of the present application do not limit this.

[0061] It should be understood that in the embodiments of the present application, in order to form staggered splicing units, the distance that the movable platform 450 is controlled to move horizontally and / or vertically each time can be determined according to actual needs, and the embodiments of the present application do not limit this.

[0062] In some optional embodiments of the present application, Figure 2B As shown, the plurality of splicing units 2311, 2312, 2313, and 2314 in the splicing unit array 230 can be randomly staggered, that is, the position of the center point of each splicing unit is random, and there is a random staggering between adjacent splicing units. This embodiment destroys the periodicity of the splicing unit arrangement by randomly staggering the splicing units in the splicing unit array, thereby making differences between the splicing units, and further weakening the diffraction effect and suppressing the rainbow stripe phenomenon.

[0063] In the process of making the spliced ​​holographic film 200, as Figure 3A As shown, by controlling the distance that the movable platform 450 moves each time, the position of each splicing unit can be randomly moved to a certain extent, so that there is a random misalignment between two adjacent splicing units. Since the random movement of the splicing unit is too large, additional problems may arise, so it is necessary to set a certain limit on the random movement of the position of the splicing unit. In an optional example, as Figure 2B As shown, the shape of the splicing unit includes a rectangle, and the misalignment between two adjacent splicing units in the splicing unit array 230 should not be greater than 10% of the minimum side length of the splicing unit.

[0064] Alternatively, if Figure 2BAs shown, since the movement of the position of the splicing unit is random, the misalignment between two adjacent splicing units in the splicing unit array 230 can be the same or different.

[0065] In some other optional implementations of the present application, the sizes of the splicing units in the splicing unit array may be the same or different. In an optional example, Figure 2B As shown, the shape of the splicing units in the splicing unit array 230 includes a rectangle, and the length and width of each rectangular splicing unit can be equal or unequal. In this embodiment, by making the sizes of the splicing units in the splicing unit array different, the size differences between the splicing units can be generated, so that there are differences between the splicing units, thereby reducing the diffraction effect and suppressing the rainbow stripe phenomenon.

[0066] In the process of making the spliced ​​holographic film 200, as Figure 3A As shown, the size of each splicing unit can be controlled by controlling the size of the light spot formed by the interference between the parallel light beam 430 and the divergent light beam 440, so that the size of each splicing unit in the splicing unit array is different. If the size of the splicing unit is too large, the size difference between the splicing units is too large, which may cause additional problems, so it is necessary to limit the size of the splicing unit. In an optional example, as Figure 2B As shown, the shape of the splicing unit includes a rectangle, and the side length of the rectangular splicing unit should be greater than 30um and less than 1000um.

[0067] In some other optional embodiments of the present application, Figure 2C As shown, there is a splicing gap 231, i.e., a splicing seam, between two adjacent splicing units 2311 and 2312 in the splicing unit array 230. In this embodiment, by providing a splicing gap between the splicing units in the splicing unit array, the transmittance of light can be improved, thereby reducing the diffraction effect and suppressing the rainbow stripe phenomenon.

[0068] In the process of making the spliced ​​holographic film 200, as Figure 3A As shown, by controlling the distance that the movable platform 450 moves each time, a seam can be formed between two adjacent splicing units in the splicing unit array. Since the gap between the splicing units visible to the naked eye may change the original function of the holographic film, it is necessary to set a certain limit on the size of the splicing gap between the splicing units. In an optional example, as Figure 2B As shown, the shape of the splicing unit includes a rectangle, and the width of the splicing gap between two adjacent splicing units in the splicing unit array 230 should not be greater than 10% of the minimum side length of the splicing unit.

[0069] Alternatively, if Figure 2BAs shown, the width of the splicing gap between two adjacent splicing units in the splicing unit array 230 may be the same or different, and the width of the splicing gap may be controlled by controlling the moving distance of the movable platform.

[0070] In some other optional embodiments of the present application, according to the imaging principle, the object distance is the same during the use of the holographic film, and only when the focal lengths of the various parts of the holographic film are the same can a complete virtual image be formed. Figure 4A As shown, it is required that all the splicing units 2331, 2332 in the splicing unit array 230 of the splicing holographic film 200 have the same focus F for the parallel incident light 310, so that the incident light 310 that meets the Bragg condition will be diffracted to the focus F after reaching the splicing holographic film 200, and the incident light 320 that does not meet the Bragg condition will be diffracted to the focus F after reaching the splicing holographic film 200. Figure 2E As shown, the spliced ​​holographic film 200 is directly transparent, and at this time, it is equivalent to a transparent glass. Figure 4B As shown, by placing object A within the focal length F on one side of the spliced ​​holographic film 200, according to the object-image relationship, a virtual image A' of object A is formed at a distance on the other side of the spliced ​​holographic film 200. In this embodiment, a virtual image with a sense of depth can be formed on the holographic film 200 by making all the splicing units in the splicing unit array have the same focal point for parallel incident light.

[0071] In an optional example of the present application, Figure 5As shown, the splicing unit array 230 of the splicing holographic film 200 may be composed of square splicing units of which the length and width of each splicing unit are equal, and there is a misalignment and a seam between two adjacent square splicing units 2341 and 2342. The side length of each square splicing unit may be 50um, the misalignment h between two adjacent square splicing units may be one of 4um, 3um, 2um, etc., and the width d of the seam between two adjacent square splicing units may be one of 4um, 3um, 2um, etc. Optionally, in the splicing unit array 230, the misalignment h between two adjacent square splicing units in different parts may be different, and the width d of the seam between two adjacent square splicing units in different parts may also be different. For example, the misalignment h between the first part of the square splicing units in the splicing unit array 230 is 4um, and the width d of the seam between two adjacent square splicing units is also 4um, the misalignment h between the second part of the square splicing units is 3um, and the width d of the seam between two adjacent square splicing units is also 3um, and the misalignment h between the third part of the square splicing units is 2um, and the width d of the seam between two adjacent square splicing units is also 2um. This embodiment does not limit the number of components in the splicing unit array 230 and the division method of each component, the value of the misalignment of each part of the splicing unit, and the value of the seam width.

[0072] In another optional example of the present application, Figure 6As shown, the splicing unit array 230 of the splicing holographic film 200 can be composed of rectangular splicing units with unequal length and width, and there is a misalignment and a seam between two adjacent rectangular splicing units 2351 and 2352. The length of each rectangular splicing unit can be 100um, the width can be 40um, the misalignment amount h between two adjacent rectangular splicing units can be one of 3um, 2um, 1um, etc., and the width d of the seam between two adjacent rectangular splicing units can be one of 3.5um, 2.5um, 1.5um, etc. Optionally, in the splicing unit array 230, the misalignment amount h between two adjacent rectangular splicing units in different parts can be different, and the width d of the seam between two adjacent rectangular splicing units in different parts can also be different. For example, the offset h between the first part of the rectangular splicing units in the splicing unit array 230 is 3um, and the width d of the seam between two adjacent rectangular splicing units is 3.5um, the offset h between the second part of the rectangular splicing units is 2um, and the width d of the seam between two adjacent rectangular splicing units is 2.5um, and the offset h between the third part of the rectangular splicing units is 1um, and the width d of the seam between two adjacent rectangular splicing units is 1.5um. This embodiment does not limit the number of components in the splicing unit array 230 and the division method of each component, the value of the offset of each part of the splicing unit, and the value of the seam width.

[0073] The embodiment of the present application also provides a method 500 for manufacturing a spliced ​​holographic film. Figure 7 FIG. 5 is a flow chart of a method 500 for manufacturing a spliced ​​holographic film according to an embodiment of the present application. The method 500 for manufacturing a spliced ​​holographic film according to an embodiment of the present application can be used to manufacture the spliced ​​holographic film 200 of any of the above embodiments. Figure 7 As shown, the method 500 for manufacturing a spliced ​​holographic film according to an embodiment of the present application may include the following steps:

[0074] S510, moving the movable platform in a horizontal direction and / or a vertical direction so as to move a target area of ​​a target material placed on the movable platform to an illumination position; wherein the target material includes a substrate and a holographic information layer located on the substrate.

[0075] S520, collimating the target light beam through a centimeter-level collimating lens to obtain a parallel light beam, irradiating the target area with the parallel light beam and the divergent light beam, and the parallel light beam and the divergent light beam interfere with each other to form a splicing unit in the holographic information layer of the target area.

[0076] S530, continue to execute the step of moving the movable platform in the horizontal direction and / or the vertical direction until the target material is traversed to form a splicing unit array in the holographic information layer, wherein the splicing units in the splicing unit array are staggered by controlling the distance that the movable platform moves in the horizontal direction and / or the vertical direction each time.

[0077] Optionally, the method 500 for manufacturing a spliced ​​holographic film according to the embodiment of the present application can also control the size of the splicing unit in the splicing unit array by controlling the size of the light spot formed each time when the parallel light beam and the divergent light beam interfere with each other.

[0078] Optionally, the method 500 for manufacturing a spliced ​​holographic film according to the embodiment of the present application can also control the distance that the movable platform moves in the horizontal direction and / or vertical direction each time, so that there is a splicing gap between two adjacent splicing units in the splicing unit array.

[0079] The above specific implementations do not constitute a limitation on the protection scope of the present disclosure. It should be understood by those skilled in the art that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent substitution and improvement made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A spliced ​​holographic film, characterized in that: include: Base material; as well as The holographic information layer is located on the substrate and comprises a splicing unit array, wherein the splicing units in the splicing unit array are arranged in a staggered manner.

2. The spliced ​​holographic film according to claim 1, characterized in that: The splicing units in the splicing unit array are randomly staggered.

3. The spliced ​​holographic film according to claim 1 or 2, characterized in that: The shape of the splicing unit includes a rectangle, and the side length of the rectangular splicing unit is greater than 30um and less than 1000um.

4. The spliced ​​holographic film according to claim 3, characterized in that: The sizes of the splicing units in the splicing unit array are the same or different.

5. The spliced ​​holographic film according to claim 3, characterized in that: The misalignment between two adjacent splicing units in the splicing unit array is not greater than 10% of the minimum side length of the splicing unit.

6. The spliced ​​holographic film according to claim 5, characterized in that: The misalignment amounts between two adjacent splicing units in the splicing unit array are the same or different.

7. The spliced ​​holographic film according to claim 5, characterized in that: There is a splicing gap between two adjacent splicing units in the splicing unit array, and the width of the splicing gap is no greater than 10% of the minimum side length of the splicing unit.

8. The spliced ​​holographic film according to claim 7, characterized in that: The widths of the splicing gaps between two adjacent splicing units in the splicing unit array are the same or different.

9. The spliced ​​holographic film according to claim 1 or 2, characterized in that: All the splicing units in the splicing unit array have the same focus for parallel incident light.

10. A method for producing a spliced ​​holographic film, characterized in that: For making a spliced ​​holographic film according to any one of claims 1 to 9, the method comprises: Move the movable platform in a horizontal direction and / or a vertical direction to move a target area of ​​a target material placed on the movable platform to an illumination position; wherein the target material comprises a substrate and a holographic information layer on the substrate; The target light beam is collimated by a centimeter-level collimating lens to obtain a parallel light beam, and the parallel light beam and the divergent light beam are used to illuminate the target area, and the parallel light beam and the divergent light beam interfere with each other to form a splicing unit in the holographic information layer in the target area; and Continue to execute the step of moving the movable platform in the horizontal direction and / or the vertical direction until the target material is traversed to form a splicing unit array in the holographic information layer, wherein the splicing units in the splicing unit array are staggered by controlling the distance that the movable platform moves in the horizontal direction and / or the vertical direction each time.

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