CN211577471U - Reflection type geometric holographic film based on two-dimensional characteristics - Google Patents

Abstract

The utility model relates to a 3D shows the field, discloses a reflection-type geometric holography membrane based on two-dimensional characteristic, including elementary membrane and a plurality of array setting on elementary membrane surface, the cross section is right triangle's column elementary prism, the face that the hypotenuse of column elementary prism cross section is located all laminates with elementary membrane surface, and inside the elementary membrane, along the length direction of column elementary prism be equipped with a plurality of alternate arrangement's stratum lucidum and reflection stratum; the inclined plane of the right-angle side of the cross section of the columnar element prism is provided with a layer of reflecting film, and the right angle included by the cross section of the columnar element prism and the error range of the angle formed by the transparent layer, the reflecting layer and the length direction of the columnar element prism are within +/-5 degrees. The utility model discloses a simple, based on cutting and processing of two-dimensional characteristic, the processing cost is low, realizes extensive easily, and in addition the elementary membrane is preferably flexible elementary membrane, and the product goodness is high, and flexible characteristic makes moreover the utility model discloses a product can satisfy needs such as folding, coiling are accomodate.

Description

Reflection type geometric holographic film based on two-dimensional characteristics

Technical Field

The utility model belongs to the technical field of 3D shows and specifically relates to a reflection type geometric holography membrane based on two-dimensional characteristic is related to.

Background

A 3D display technology capable of spatially displaying a stereoscopic picture is a most important display technology in future life. Currently, the mainstream 3D display is also a binocular parallax-based stereoscopic image-based pseudo 3D display technology. The display method has many disadvantages, and also causes problems such as visual fatigue of users, and cannot become a mainstream display technology in the future.

The display mode of forming a real stereoscopic picture in the air can display the stereoscopic picture in the most real mode, and is a trend of developing future display technologies. There are some technologies that can display a picture in air in a floating manner, for example, a retro-reflection and spectroscope-based scheme can display the picture in air, but such technologies usually require a microstructure screen containing a series of very fine three-dimensional features. For example, in the light reflecting screen including a series of triangular cones in the prior art, since the microstructures of the three-dimensional features are very fine, numerous microstructures of the three-dimensional features are uniformly and densely arranged on one screen, which is very difficult to process, the processing precision is difficult to ensure, and the processing efficiency and the yield are difficult to ensure.

Publication No. is CN 108269511A's a sky suspension display system, this application discloses a scheme of two-dimensional plane air imaging, discloses a contrary reflective right triangle prism array, and it includes the light reflecting screen of a series of right triangle prisms, and this kind of right triangle prism can only realize the contrary formation of image function in the plane, and when light was not parallel with the cross-section, just can't realize contrary reflection function, need come the light modulation and then realize contrary formation of image with the help of other optical module in addition.

In addition, above-mentioned right triangle prism array can adopt the optical material of stereoplasm to process usually, and appears breakage easily and produce residual stress scheduling problem in the hard material course of working, causes the product yields low, can't satisfy needs such as folding, coiling accomodate.

SUMMERY OF THE UTILITY MODEL

Aiming at the defects of the prior art, the reflective geometric holographic film based on the two-dimensional characteristics is provided, simple cutting and processing are carried out on the element film adhered with the transparent film, the reflective geometric holographic film containing a series of columnar element prisms with right-angled triangle-shaped cross sections is manufactured, and retro-reflection imaging of light is realized, so that the light irradiated at any angle on the reflective geometric holographic film can realize retro-reflection imaging, and 3D imaging can be directly carried out without modulating other optical modules.

In order to solve the technical problem, the utility model provides a reflective geometric holography membrane based on two-dimensional characteristics, which comprises a basic element membrane and a plurality of columnar element prisms, wherein the columnar element prisms are arranged on the surface of the basic element membrane in an array mode and have right-angled triangle cross sections, and the columnar element prisms are used for reflecting back by contrasting light rays on the columnar element prisms;

the surface of the bevel edge of the cross section of the columnar elementary prism is attached to the surface of the elementary film, and a plurality of transparent layers and reflecting layers which are arranged at intervals are arranged in the elementary film along the length direction of the columnar elementary prism;

a layer of reflecting film is arranged on the inclined plane where the right-angle side of the cross section of the columnar element prism is positioned and is used for performing mirror reflection on light;

the cross section of the columnar element prism is a right angle contained in a right triangle, and the error range of angles formed by the transparent layer and the reflecting layer and the length direction of the columnar element prism is within +/-5 degrees.

Further, the length of the hypotenuse of the right triangle of the cross section of the columnar element prism is a mm, and a is less than or equal to 2 mm.

Further, the cross section of the columnar element prism is an isosceles right triangle.

Further, the end face of the columnar element prism and/or the end face of the element film parallel to the transparent layer is also provided with a reflective film.

Further, the two-dimensional feature-based reflective geometric holographic film is a flexible film.

Further, the reflective geometric holographic film based on the two-dimensional features has the horizontal clamping drooping length of L cm and the folding times of n, and meets the following requirements:

l is more than or equal to 5 or n L is more than 9.

Further, protective films are respectively arranged on the bottom surface of the element film and the reflecting film, wherein the protective films arranged on the bottom surface of the element film are transparent protective films.

Compared with the prior art, the utility model has the advantages of:

1. the preparation of large-scale and high-precision reflective holographic film is easy to realize based on two-dimensional characteristics, the production speed is high, the product goodness rate is high, the process cost is low, and the imaging quality is excellent;

2. the retro-reflection imaging function can be realized without an additional lens element;

3. the flexible screen can be prepared, and the application form is flexible.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments described in the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.

FIG. 1 is a schematic diagram of the reflected light path of light rays on mutually perpendicular surfaces, i.e. right-angle reflecting walls,

FIG. 2 is a schematic structural diagram of a two-dimensional feature-based reflective geometric holographic film according to the present invention after a part of the reflective film 3 is hidden,

figure 3 is a front view of figure 2,

figure 4 is a diagram of the retro-reflection paths of a single columnar element prism 2 and a film 1 for any light ray not parallel to their cross-sections,

figure 5 is a system schematic of a reflective geometry holographic display system,

the reference numbers are as follows:

the device comprises a base element film 1, a transparent layer 11, a reflecting layer 12, a columnar base prism 2, an inclined surface 21, a reflecting film 3, an image source 100, a reflective geometric holographic screen 101, an auxiliary imaging screen 102, a supporting structure 103, a controller 104, an interactive action capturing unit 105 and a human eye tracking unit 106.

Detailed Description

In order to make the technical solution of the present invention better understood, the present invention is described in detail below with reference to the accompanying drawings, and the description of the present invention is only exemplary and explanatory, and should not be construed as limiting the scope of the present invention.

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

It should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like refer to the orientation or positional relationship shown in the drawings, or the orientation or positional relationship that the utility model is usually placed when in use, and are used for convenience of description and simplification of description, but do not refer to or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

Furthermore, the terms "horizontal", "vertical", "overhang" and the like do not imply that the components are required to be absolutely horizontal or overhang, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

First, referring to fig. 1, when a light beam is irradiated on two reflecting walls forming a right angle, after two reflections, the outgoing light beam propagates along a direction parallel to the incoming light beam. When the right-angle reflecting wall is small enough, the distance between the emergent ray and the incident ray is also very small and cannot be distinguished by human eyes, and the visual effect is just like the ray returning in the original path. Of course, the two-dimensional planar rectangular reflecting wall can only reflect light in a plane, and if a rectangular triangular pyramid-shaped reflecting wall can be formed in a space, light in the space can be reflected.

Referring to fig. 2 to 4, based on the above light path principle, the present invention provides a reflective geometric holographic film based on two-dimensional features, which includes a base film 1 and a plurality of columnar prism elements 2 with right triangle cross section, which are arranged on the surface of the base film 1, and are used for reflecting light rays with any angle thereon;

as shown in fig. 2, the surfaces of the oblique sides of the cross section of the columnar elementary prisms 2 are attached to the surface of the elementary film 1, and a plurality of transparent layers 11 and reflecting layers 12 which are arranged at intervals are arranged in the elementary film 1 along the length direction of the columnar elementary prisms 2;

the bottom surface of the element film 1 is a light incident surface, the reflecting layer 12 and the inclined surface 21 where the right-angle side of the cross section of the columnar element prism 2 is located are reflecting surfaces, and the inclined surface 21 where the right-angle side of the cross section of the columnar element prism 2 is located is used for performing mirror reflection on light.

The end face of the element film 1 parallel to the transparent layer 11 and the end face of the columnar element prism 2 may also be reflective surfaces, and a reflective film 3 having a reflective light ray may be provided thereon, and it should be noted that, if the end face of the element film 1 parallel to the transparent layer 11 is the reflective layer 12 during the processing, it is not necessary to plate the reflective film 3 on the end face of the reflective layer 12, because the reflective layer 12 itself has a function of specular reflection of light rays.

The combination of the single prism 2 with right-angled triangular cross section and the base film 1 has a plurality of right-angled reflecting walls, so that the microstructure unit has the function of retroreflecting spatial light, and thus, if a plurality of microstructures are densely arranged on one plane, a large area of incident light can be retroreflected.

As shown in fig. 4, when any light ray not parallel to the cross section of the columnar prism 2 strikes the reflective layer 12 or the reflective film 3 on the end face of the columnar prism 2 from the incident surface, the light ray is reflected to an adjacent one of the inclined surfaces 21 by a first reflection, reflected to the other inclined surface 21 by a second reflection of the reflective film 3 coated on the inclined surface 21, and reflected back in a direction parallel to the incident light after being shifted by D mm by a third reflection of the reflective film 3 coated on the inclined surface 21, and the retro-reflected light rays can be subjected to 3D imaging;

the above-mentioned allowable error range of the angle is within ± 5 °, including the right angle of the right triangle of the cross section of the columnar prism 2 and the angle between the transparent layer 11 and the reflective layer 12 and the length direction of the columnar prism 2, and although the above principle is implemented based on the ideal geometry, in practical cases, the machining process may not produce the perfect geometry, the angle may have a certain error, and the vertex may not be a perfect geometric point but a round corner with a very small radius. When the manufacturing error is small, the direction of the reflected light slightly deviates from the ideal retroreflection situation, the deviations cannot be distinguished by human eyes, and the aberration caused by the errors is very small, so that the good imaging effect can be realized.

For example, when the right angle error of the cross section of the columnar prism 2 is within ± 5 °, the user experience is relatively satisfactory, and when the right angle error is beyond the range, the user starts to feel that the imaging effect is not acceptable. Also the geometrical apex allows for a relatively small rounded corner (e.g. less than 0.1mm radius), then a relatively good imaging function can be achieved as well. Of course, the smaller the error, the higher the user rating, so the error should be reduced as much as possible in production.

Of course, the smaller the error, the higher the user rating, so the error should be reduced as much as possible in production. Similar machining tolerances apply for the cutting direction and the bonding direction.

When the method is applied specifically, when the angle error of the living room application is within +/-2.5 degrees, the user experience is relatively satisfactory;

when the angle error of the desktop application is within +/-1 degree, the user experience is relatively satisfactory;

when the angle error of the mobile terminal application is within +/-0.5 degrees, the user experience is relatively satisfactory.

For the incident light parallel to the cross section of the columnar prism 2, the light-induced retro-reflection 3D imaging can be realized through two reflections of the two inclined planes 21 according to the light path principle of FIG. 1.

Therefore, the column-shaped element prism 2 and the reflection-type geometric holographic film based on the two-dimensional characteristics of the utility model, which is composed of a series of column-shaped element prisms 2, have the function of retroreflection compared with any light on the reflection-type geometric holographic film, and can retroreflect back the light irradiated on the reflection-type geometric holographic film after the light deviation distance d mm, wherein d is not more than 2 mm, and d is the distance from the intersection point of the emergent light and the bottom surface of the reflection-type geometric holographic film to the incident light;

preferably, as shown in fig. 3, the length of the hypotenuse of the cross section of the right-angled triangle of the above columnar elementary prism 3 is a mm, and a is ≦ 2 mm;

considering that the flexible film has a relatively more flexible application form, the application range can be wider, and meanwhile, the processing process of the flexible material cannot be damaged due to collision, falling, vibration and the like. Therefore, the two-dimensional characteristic-based reflective geometric holographic film of the present invention preferably adopts a flexible film made of flexible material, the screen manufactured in this way not only can meet the requirements of folding, winding and containing, but also is based on the characteristic of flexibility, in the production and processing process, difficult easy breaking that appears and produce residual stress scheduling problem, the utility model discloses a flexible material that reflection type geometry holography membrane based on two-dimensional characteristic includes is preferred PMMA membrane, lPMMA membrane, PS membrane, PC membrane, PE membrane, styrene acrylonitrile membrane, MS membrane, PET membrane, PETG membrane, ABS membrane, PP membrane, PA membrane, SAN membrane, MS membrane, MBS membrane, PES membrane, CR-39 membrane, TPX membrane, HEMA membrane, F4 membrane, F3 membrane, EFP membrane, PVF membrane, PVDF membrane, EP membrane, PF membrane, UP membrane, cellulose acetate membrane, nitric acid, EVA membrane, PE membrane, PVC membrane, novel amorphous thermoplastic polyester film, amorphous cycloolefin membrane and the arbitrary one in the modified bisphenol A epoxy resin membrane.

In order to further guarantee reliability, it is necessary to satisfy at the same time: the horizontal clamping drooping length is L cm, the folding times are n, and the requirements are met: l is more than or equal to 5 or n L is more than 9.

Wherein n is the number of foldable times, and the sampling area is 100 cm during testing²The square sample is folded into a rectangle along the middle line position of the square (or within 1 cm around the middle line position), then the folded elementary membrane is clamped in the middle by two flat plates, and the application is not less than>The pressure maintaining time is more than or equal to 5s under the action of 10N of force, then the sample is opened (a doubling-up test is completed at the moment), whether a small sample generates local micro-cracks or is cut into two parts along a crease is checked, if the small sample does not generate the local micro-cracks or is cut into two parts along the crease, the test is stopped until the local micro-cracks are generated or the small sample is cut into two parts, and the total folding times in the test process are recorded as N;

wherein L is the horizontal clamping sagging length, the test method comprises the following steps: the method comprises the steps of (1) taking a narrow strip with the width of 5 cm +/-0.5 cm and the length of about 25 cm, enabling one end of the narrow strip to be attached to a horizontal reference desktop, ensuring that the length of the narrow strip extending out of the desktop is 20 cm +/-1 cm, and then standing to measure the vertical height difference between the end point of the narrow strip extending out of the desktop and the horizontal reference desktop after the narrow strip is stabilized to be recorded as the horizontal drooping length L;

the test is an accelerated test means, the reliability of the sample in the long-term use process can be rapidly judged, the flexible film needs to bear operations such as winding, storage, opening and the like for many times when being applied, the service life is calculated according to the design 5 years, the whole life cycle needs to be stored and unfolded for about 10000 times, and in order to evaluate the use reliability in an accelerated way, the utility model adopts the above-mentioned folding test and the horizontal clamping sagging length test;

when n is larger than L & gt 9, the larger n is, the smaller the ultimate bending curvature radius of the base element film is, the stronger the breaking resistance is, meanwhile, the larger L is, the better the flexibility of the base element film is, the more difficult the structure of the film is damaged due to winding, experiments show that the opening and closing tests of 10000 times are basically equivalent when n is larger than L & gt 9, the requirement on the minimum design life is met, and if the n is smaller, the quality problem is easy to occur in the service cycle of the product, and the customer experience is reduced;

in practical application, some winding screens which cannot be folded safely can be used, but the structure cannot be damaged after winding, so that the winding screens are also suitable. For the material, as long as the prepared elementary membrane can be wound into a cylindrical shape with the diameter less than 5 cm, the whole elementary membrane is relatively flexible, and the fracture loss in the processing process is relatively small. Usually, when L is more than or equal to 5 cm, the elementary membrane can be wound into a cylindrical shape with the diameter less than 5 cm without breaking.

The following table is some of the data at the time of validation:

it is added that the flexibility characteristics of the holographic film greatly depend on the raw material, and the flexibility characteristics of the holographic film can be adjusted in a wide range by controlling the thickness of the raw material. These data can be obtained by simple experiments, which are not described herein.

Although the above accelerated test method can provide a relatively suitable design guide, the test process is still relatively troublesome in actual operation, and in the case that the design requirement is not particularly strict, the determination can be made in a very rapid manner as follows. Generally, the goodness to the flexible material course of working is relatively easy to guarantee, so the screen application scenario is considered preferentially, practical application tests find that the screen is stored in the reel, the reel storage screen form can be well realized when L is greater than twice the radius of the innermost layer of the reel, and L can be greater than 3 times or even 5 times the radius of the innermost layer of the reel for designing in order to leave enough design margin.

In order to protect the internal microstructure, protective films are respectively disposed on the reflective films 3 disposed on the bottom surface and the end surface of the element film 1 and the inclined surface 21, wherein the bottom surface of the element film 1 is a light incident surface, so that the protective film disposed on the bottom surface of the element film 1 is a transparent protective film, and the end surface and the inclined surface 21 are reflective surfaces, and the protective film disposed thereon is not necessarily transparent, and is not limited herein.

The material of the protective film is preferably flexible material, such as any one of PMMA film, PS film, PC film, PE film, styrene acrylonitrile film, MS film, PET film, PETG film, ABS film, PP film, PA film, SAN film, MS film, MBS film, PEs film, CR-39 film, TPX film, HEMA film, F4 film, F3 film, EFP film, PVF film, PVDF film, EP film, PF film, UP film, cellulose acetate film, cellulose nitrate film, EVA film, PE film, PVC film, novel amorphous thermoplastic polyester film, amorphous cycloolefin film, and modified bisphenol a epoxy resin film;

or may be rigid, such as plastic film, glass, etc.

The preparation method of the reflective geometric holographic film based on the two-dimensional characteristics comprises the following steps:

1) preparing a basic element film 1 with a transparent layer 11 and a reflecting layer 12 arranged alternately and a transparent film corresponding to the basic element film 1, preferably a flexible holographic basic element film with the publication number of CN110794504A and a preparation method and a flexible holographic basic element film in application thereof;

2) adhering a transparent film on the surface of the base film 1, cutting the transparent film along the direction vertical to the transparent layer 11 and the reflecting layer 12 to form a film with an undulating sawtooth-shaped surface formed by arranging columnar base prisms 2 with right-angled triangle-shaped cross sections in an array, wherein one layer is the base film 1;

3) and plating a layer of reflecting film 3 on the end surface of the columnar element prism 2 and the inclined plane 21 where the right-angle side of the cross section is positioned, thus obtaining the reflecting type geometric holographic film based on the two-dimensional characteristics.

It should be noted that, according to the actual requirement, the element film 1 adopted in step 1) may not use a flexible element film, and the element film is prepared from a material meeting the requirement according to the publication number CN110794504A, the preparation method thereof and the preparation method in the application, and can be applied to the utility model.

In addition to the above-mentioned preparation method, a two-step preparation method can be used, for example, a series of columnar prisms with right-angled triangular cross sections are directly arranged on the surface of the elementary film formed by alternately arranging the transparent layer and the reflecting layer in the direction orthogonal to the interlayer interface in the elementary film, the surface of the hypotenuse of the right-angled triangular cross section is connected with the elementary film 1, and the surface of the right-angled side is provided with the reflecting film 3, so that the function of the reflective holographic film can be realized. The method specifically comprises the following steps: firstly, preparing a piece of element film 1 with a transparent layer 11 and a reflection layer 12 arranged alternately and a piece of transparent film corresponding to the element film 1 (or a plurality of cut columnar element prisms 2 corresponding to the element film 1), then cutting the transparent film into a plurality of columnar element prisms 2 corresponding to the element film 1, then adhering the columnar element prisms 2 on the surface of the element film 1 in an array mode along the direction vertical to the transparent layer 11 and the reflection layer 12 (a certain error is allowed in the actual processing process, and the error range of +/-5 degrees is preferred), and then carrying out the film coating process in the method.

The following embodiments are further described and illustrated in the following, which are not intended to limit the invention:

example 1

Preparing a rectangular flexible substrate film 1 with the thickness of 1mm and alternately arranged transparent layers 11 and reflecting layers 12 and a transparent film with the thickness of 1mm corresponding to the rectangular substrate film 1, wherein the transparent layers 11 are made of PC films, the reflecting layers 12 are made of aluminum foil reflecting films, and the transparent film is a PC film;

bonding the transparent film on the surface of the base element film 1, cutting the transparent film along the direction vertical to the transparent layer 11 and the reflecting layer 12 to obtain a waste material, wherein the section of the waste material is an isosceles right triangle prism with the height of 1mm, and obtaining a plurality of columnar element prisms 2 with the cross sections of 1mm isosceles right triangles which are arrayed on the surface of the base element film 1 and have an undulating zigzag shape; then a layer of reflecting film 3 is plated on the end face and the inclined plane 21 of the film, so that a reflecting type geometric holographic film based on two-dimensional characteristics is prepared, and finally a layer of protective film is plated on the reflecting film 3 to protect the internal microstructure of the holographic film. In order to increase the strength of the film, a transparent protective film may be plated on the bottom surface of the element film before cutting.

The hologram film manufactured in example 1 includes a series of isosceles right triangle columnar element prisms 2 having a cross section of a hypotenuse of 2 mm, and based on the optical path principle of fig. 1, light is incident from an incident surface and then retroreflected back through a right-angle reflecting wall, and an offset d is not larger than the length of the hypotenuse of the cross section by 2 mm, that is, d is not larger than 2 mm.

Example 2

Preparing a rectangular flexible substrate film 1 with the thickness of 0.5mm and the alternate arrangement of a transparent layer 11 and a reflecting layer 12 and a transparent film with the thickness of 1mm corresponding to the rectangular substrate film 1, wherein the transparent layer 11 is made of a PC film, the reflecting layer 12 is made of an aluminum foil reflecting film, and the transparent film is a PC film;

bonding the transparent film on the surface of the base element film 1, cutting the transparent film along the direction vertical to the transparent layer 11 and the reflecting layer 12 to obtain a waste material, wherein the section of the waste material is an isosceles right triangle prism with the height of 0.5mm, and obtaining a plurality of columnar base element prisms 2 arrays with the cross sections of 0.5mm isosceles right triangles on the surface of the base element film 1 and a wavy and zigzag film; then a layer of reflecting film 3 is plated on the end face and the inclined plane 21 of the film, so that a reflecting type geometric holographic film based on two-dimensional characteristics is prepared, and finally a layer of protective film is plated on the reflecting film 3 to protect the internal microstructure of the holographic film. In order to increase the strength of the film, a transparent protective film may be plated on the bottom surface of the element film before cutting.

The holographic film manufactured in embodiment 2 includes a series of isosceles right triangle columnar element prisms 2 having a cross section of a hypotenuse of 1mm, and based on the optical path principle of fig. 1, light is incident from an incident surface and then reflected back by a right-angle reflecting wall, and an offset d existing is not greater than the length of the hypotenuse of the cross section by 1mm, that is, d is not greater than 1 mm.

Example 3

Preparing a rectangular flexible substrate film 1 with the thickness of 0.2 mm and the alternate arrangement of a transparent layer 11 and a reflecting layer 12 and a transparent film with the thickness of 1mm corresponding to the rectangular substrate film 1, wherein the transparent layer 11 is made of a PC film, the reflecting layer 12 is made of an aluminum foil reflecting film, and the transparent film is a PC film;

bonding the transparent film on the surface of the base element film 1, cutting the transparent film along the direction vertical to the transparent layer 11 and the reflecting layer 12 to obtain a waste material, wherein the section of the waste material is an isosceles right triangle prism with the height of 0.2 mm, and obtaining a plurality of columnar base element prisms 2 arrays with the cross sections of 0.2 mm isosceles right triangles on the surface of the base element film 1 and a wavy and zigzag film; then a layer of reflecting film 3 is plated on the end face and the inclined plane 21 of the film, so that a reflecting type geometric holographic film based on two-dimensional characteristics is prepared, and finally a layer of protective film is plated on the reflecting film 3 to protect the internal microstructure of the holographic film. In order to increase the strength of the film, a transparent protective film may be plated on the bottom surface of the element film before cutting.

The hologram film manufactured in example 3 includes a series of isosceles right triangle-shaped columnar element prisms 2 having a cross section of a hypotenuse of 0.4 mm, and based on the optical path principle of fig. 1, light is incident from the incident surface and then reflected back through the right-angle reflecting wall, and an offset d exists that is not greater than the length of the hypotenuse of the cross section by 0.4 mm, that is, d is not greater than 0.4 mm.

Example 4

Preparing a rectangular flexible substrate film 1 with the thickness of 0.1mm and the alternate arrangement of a transparent layer 11 and a reflecting layer 12 and a transparent film with the thickness of 1mm corresponding to the rectangular substrate film 1, wherein the transparent layer 11 is made of a PC film, the reflecting layer 12 is made of an aluminum foil reflecting film, and the transparent film is a PC film;

bonding the transparent film on the surface of the base element film 1, cutting the transparent film along the direction vertical to the transparent layer 11 and the reflecting layer 12 to obtain a waste material, wherein the section of the waste material is an isosceles right triangle prism with the height of 0.1mm, and obtaining a plurality of columnar base element prisms 2 arrays with the cross sections of 0.1mm isosceles right triangles on the surface of the base element film 1 and a wavy and zigzag film; then a layer of reflecting film 3 is plated on the end face and the inclined plane 21 of the film, so that a reflecting type geometric holographic film based on two-dimensional characteristics is prepared, and finally a layer of protective film is plated on the reflecting film 3 to protect the internal microstructure of the holographic film. In order to increase the strength of the film, a transparent protective film may be plated on the bottom surface of the element film before cutting.

The hologram film manufactured in example 4 includes a series of isosceles right triangle-shaped columnar element prisms 2 having a cross section of a hypotenuse of 0.2 mm, and based on the optical path principle of fig. 1, light is incident from the incident surface and then reflected back through the right-angle reflecting wall, and an offset d exists that is not greater than the length of the hypotenuse of the cross section by 0.2 mm, that is, d is not greater than 0.2 mm.

The above embodiment may also be implemented by cutting to obtain the intermediate product columnar element prisms 2, and then adhering the columnar element prisms 2 to the surface of the base film 1 perpendicularly to the transparent layer 11 and the reflective layer 12 array, wherein the error range of the adhesion direction is within ± 5 ° during actual adhesion.

In a specific application, generally, the closer the display device is to the human eye, the higher the resolution is required, for example, for a desktop-like display, the thickness of the transparent layer 11 of the preferable substrate film 1 is less than or equal to 1mm, and d is less than or equal to 1 mm;

it is preferable for the display-demanding device that the transparent layer 11 of the base film 1 has a thickness of 0.5mm or less while d is 0.5mm or less;

for devices with higher display detail requirements, the transparent layer 11 is preferably less than or equal to 0.3mm thick, while d is less than or equal to 0.3 mm;

the transparent film adhered to the surface of the base element film 1 is cut or is cut firstly to obtain the columnar element prism 2 with the cross section of a right triangle, and then the direction arrays vertical to the transparent layer 11 and the reflecting layer 12 are adhered to the surface of the base element film 1, and the cutting processing based on the two-dimensional characteristics is adopted, so that the operation is simple, the large-scale and high-precision production is realized easily, the production speed is high, the process cost is low, in addition, the base element film is preferably a flexible base element film, the problems of frequent breakage and residual stress generation and the like in the hard material processing process can not occur in the cutting processing process, the excellent rate of products is high, and the flexible characteristic ensures that the utility model discloses a product can meet the requirements of folding, winding and storage and the like;

based on the light path principle of right angle reflection wall, the utility model discloses a reflection type geometric sense holographic membrane product self based on two-dimensional characteristic has modulation light, can realize contrary reflection formation of image, need not to realize contrary reflection formation of image function with the help of extra lens component.

Will reflection type geometric sense holographic film based on two-dimensional characteristic be applied to reflection type geometric sense holographic display system, specifically do:

referring to FIG. 5, a reflective geometric holographic display system includes an image source 100, a reflective geometric holographic screen 101, an auxiliary imaging screen 102, a support structure 103, and a controller 104;

the image source 100 is used for providing a projection picture, and may be an element capable of generating an image, such as an LCD display screen, an LED display screen, a projector, a holographic projector, and the like, preferably a projector or a holographic projector;

the reflective geometric holographic screen 101 is used for retroreflecting light irradiated on the reflective geometric holographic screen, and the reflective geometric holographic film based on the two-dimensional characteristics prepared by the utility model is adopted;

the auxiliary imaging screen 102 is used for light splitting, and is preferably made of a semitransparent and semi-reflecting material;

the supporting structure 103 is respectively matched with the image source 100, the reflective geometric holographic screen 101 and the auxiliary imaging screen 102 to provide physical structural support for the three;

the controller 104 is electrically connected to the image source 100, and is configured to control the image source 100 to adjust a depth of field and display content of the projection image;

in order to increase the flexibility of the display system, we can also set the supporting structure 103 as a movable or deformable structure, electrically connect the supporting structure 103 and the controller 104, the supporting structure 103 makes corresponding response actions according to the control information of the controller 104, and implement the relative movement and/or the overall movement of the image source 100, the reflective geometric holographic screen 101 and the auxiliary imaging screen 102, so that the visual window of the system always covers the eyes of the user, so that the user can normally view the picture in different orientations, it should be noted that the supporting structure 103 is a general prior art, and those skilled in the art can design by themselves according to the spatial conditions of the practical application, for example: the deformable structure can be easily designed by using a plurality of hinge structures and structures similar to the umbrella shaft, and is not particularly limited;

preferably, the holographic display system of the present invention further includes an interactive action capturing unit 105 electrically connected to the controller 104, the interactive action capturing unit 105 is configured to recognize the interactive action of the user and send the user interactive action information to the controller 104, the controller 104 adjusts the content of the display screen according to the received user interactive action information obtained by the interactive action capturing unit 105, so as to implement the interactive action between the user and the screen, specifically, the user interactive information is obtained by recognizing the gesture action of the user by using a camera in combination with a machine vision technique, so as to control the content of the display screen or control the movement of the supporting structure 103 to adjust the spatial position and posture of the image source 100, the reflective geometric holographic screen 101 and/or the auxiliary imaging screen 102, and the controller 104 can also adjust the content of the display screen in real time according to the received user interactive action information obtained by the interactive action capturing unit 105, the method includes the steps that interaction between a user and a picture is achieved, for example, the picture is controlled to translate according to a translation gesture signal, or operations such as amplification, zooming-in, zooming-out and touch of the picture are controlled according to other corresponding interaction;

the setting of the interactive motion capture unit 105 has positive significance for application scenarios like wearable applications where the spatial position of the user relative to the display system is fixed;

in addition, for an application scenario that the spatial position of the user changes in real time relative to the display system, a human eye tracking unit 106 electrically connected to the controller 104 needs to be further provided, the human eye tracking unit 106 is configured to track the position of human eyes and send the positioning information of the human eyes to the controller 104, and the controller 104 controls the support structure 103 to make a corresponding action response according to the received human eye positioning information acquired by the human eye tracking unit 106, so as to adjust the relative position and/or the overall spatial position of the image source 100, the reflective geometric holographic screen 101 and/or the auxiliary imaging screen 102, so that the eyes of the user are always located in the visible space of the system, and thus the user can always receive the projection information even in a moving state, and can normally watch the image.

In practical applications, the interactive motion capture unit 105 and the human eye tracking unit 106 may be integrated in the same device, for example, a machine vision camera device.

The image source 100 projects a picture, light irradiates on the auxiliary imaging screen 102, part of the light directly penetrates through the auxiliary imaging screen 102, the part of the light does not participate in imaging, the other part of the light is reflected to the reflective geometric holographic screen 101 through the auxiliary imaging screen 102, the part of the light is subjected to optical transformation through the reflective geometric holographic screen 101, the original direction is reflected back after the light deviates by a small distance d and penetrates through the auxiliary imaging screen 102, and an off-screen picture which can be observed is formed in space.

The foregoing is a more detailed description of the present invention, taken in conjunction with the specific preferred embodiments thereof, and it is not intended that the invention be limited to the specific embodiments shown and described. To the utility model belongs to the technical field of ordinary technical personnel, do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.

Claims (7)

1. Reflection type geometric holographic film based on two-dimensional characteristics is characterized in that: comprises a base element film (1) and a plurality of columnar base element prisms (2) which are arranged on the surface of the base element film (1) in an array mode and have right-angled triangle-shaped cross sections;

the surface of the oblique side of the cross section of the columnar elementary prism (2) is attached to the surface of the elementary film (1), and a plurality of transparent layers (11) and reflecting layers (12) which are arranged at intervals are arranged in the elementary film (1) along the length direction of the columnar elementary prism (2);

a layer of reflecting film (3) is arranged on an inclined plane (21) where the right-angle side of the cross section of the columnar element prism (2) is located and used for performing mirror reflection on light;

the cross section of the columnar elementary prism (2) comprises right angles, and the error range of the angles formed by the transparent layer (11) and the reflecting layer (12) and the length direction of the columnar elementary prism (2) is within +/-5 degrees.

2. The two-dimensional feature-based reflective geometric holographic film of claim 1, wherein: the length of the hypotenuse of the right triangle of the cross section of the columnar elementary prism (2) is a mm, and a is less than or equal to 2 mm.

3. The two-dimensional feature-based reflective geometric holographic film of claim 1, wherein: the cross section of the columnar elementary prism (2) is an isosceles right triangle.

4. The two-dimensional feature-based reflective geometric holographic film of claim 1, wherein: the end face of the columnar element prism (2) and/or the end face of the element film (1) parallel to the transparent layer (11) is also provided with a layer of reflecting film (3).

5. The two-dimensional feature-based reflective geometric holographic film of claim 1, wherein: the reflective geometric holographic film based on two-dimensional features is a flexible film.

6. The two-dimensional feature-based reflective geometric holographic film of claim 5, wherein: the reflective geometric holographic film based on the two-dimensional features has the horizontal clamping droop length of L cm and the folding times of n, and meets the following requirements:

l is more than or equal to 5 or n L is more than 9.

7. The two-dimensional feature-based reflective geometric holographic film of claim 1, wherein: protective films are respectively arranged on the bottom surface of the base element film (1) and the reflecting film (3), wherein the protective film arranged on the bottom surface of the base element film (1) is a transparent protective film.

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