CN211698263U - Reflection type geometric holographic film based on two-dimensional characteristics - Google Patents

Abstract

The utility model relates to the field of 3D display, and discloses a reflection type geometric holographic film based on two-dimensional characteristics, which comprises a series of pentagonal columnar elementary prisms with cross sections of a first right-angled triangle or a combination of a rectangle and a second right-angled triangle, and is used for retro-reflecting light irradiated on the prisms; the prism comprises a cylindrical element prism, wherein a plurality of transparent layers and reflecting layers which are arranged at intervals are arranged in the cylindrical element prism along the length direction, a reflecting film is arranged on an inclined plane where a right-angle side of the cross section of the cylindrical element prism is located, and the error ranges of right angles contained in a first right-angle triangle and a pentagon and the angles formed between the reflecting layers and the cylindrical element prism along the length direction 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, the reflective geometric holographic film comprising a series of columnar element prisms is prepared by simply cutting and processing the element films provided with the transparent layers and the reflecting layers which are arranged at intervals, so that the light can be reflected in the original direction by irradiating the light on the reflective geometric holographic film at any angle, 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 reflection-type geometric holographic film based on two-dimensional characteristics, which comprises a series of pentagonal columnar elementary prisms with cross sections of first right-angled triangles or a combination of a rectangle and a second right-angled triangle, and is used for retroreflecting light irradiated on the prisms;

a plurality of transparent layers and reflecting layers which are arranged at intervals are arranged in the columnar element prism along the length direction, and a reflecting film is arranged on an inclined plane where a right-angle side of the cross section of the columnar element prism is positioned and used for performing mirror reflection on light;

the error ranges of right angles contained in the first right-angle triangles and pentagons and angles formed by the reflecting layer and the length direction of the columnar elementary prisms are within +/-5 degrees.

Furthermore, the hypotenuse of the second right triangle coincides with one side of the rectangle, the length is amm, the length of the other side of the rectangle is bmm, wherein a is less than or equal to 2mm, and b is less than or equal to 0 and less than or equal to 5 mm.

Further, the first right-angle triangle and/or the second right-angle triangle are isosceles right-angle triangles.

Further, the end face of the columnar element prism is also provided with a layer of reflective film.

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

Further, the horizontal clamping sagging length of the reflection type geometric holographic film based on the two-dimensional features is L cm, the number of folding times is n, and the requirements are as follows:

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 columnar elementary prism and the reflecting film, wherein the protective film arranged on the bottom surface is a transparent protective film.

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

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

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 front view of a two-dimensional feature-based reflective geometric holographic film according to the present invention with a cross section of a first right triangle 1;

FIG. 3 is an enlarged view of a portion I of FIG. 2;

fig. 4 is an axial view of the reflection type geometric holographic film based on two-dimensional features according to the present invention, in which a part of the inclined plane 6 and the reflective film 7 on the end surface 5 are hidden, and the cross section of the reflection type geometric holographic film is a first right triangle 1, and the internal structure of the holographic film is mainly shown;

FIG. 5 is a diagram of the retro-reflection path of a prism 3 of a columnar element having a cross section of a first right-angled triangle 1 for any light ray not parallel to the cross section;

fig. 6 is a front view of a reflective geometric holographic film based on two-dimensional features according to the present invention, which has a cross section of a pentagon 2 formed by a rectangle 21 and a second right triangle 22;

FIG. 7 is an enlarged view of a portion II of FIG. 6;

fig. 8 is an axial view of a reflection type geometric holographic film based on two-dimensional features according to the present invention, in which a part of the inclined plane 6 and the reflective film 7 on the end surface 5 are hidden, and the cross section is a pentagon 2 formed by a rectangle 21 and a second right triangle 22, and the internal structure of the holographic film is mainly shown;

FIG. 9 is a diagram of the retro-reflection paths of a cylindrical elementary prism 3 having a cross section of a pentagon 2 consisting of a rectangle 21 and a second right-angled triangle 22 for any light ray not parallel to the cross section;

figure 10 is a system schematic of a reflective geometry holographic display system,

the reference numbers are as follows:

the image display device comprises a first right triangle 1, a pentagon 2, a rectangle 21, a second right triangle 22, a columnar elementary prism 3, a transparent layer 31, a reflective layer 32, a bottom surface 4, an end surface 5, an inclined surface 6, a reflective film 7, an image source 100, a reflective geometric holographic screen 101, an auxiliary imaging screen 102, a support structure 103, a controller 104, an interactive action capture 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 9, based on the above-mentioned light path principle, the present invention provides a reflective geometric holographic film based on two-dimensional features, which comprises a series of columnar element prisms 3 with cross sections of pentagons 2 combined by a first right-angled triangle 1 or a rectangle 21 and a second right-angled triangle 22, preferably, the first right-angled triangle 1 and/or the second right-angled triangle 22 are isosceles right-angled triangles;

as shown in fig. 4 and 8, a plurality of transparent layers 31 and reflective layers 32 are disposed inside a single prism 3 along the length direction, the bottom surface 4 of the prism 3 is a light incident surface, the reflective layers 32 and an inclined surface 6 where right-angle sides of the cross section of the prism 3 are located are reflective surfaces, and a reflective film 7 is disposed on the inclined surface 6 for performing mirror reflection on light.

The end face 5 of the columnar element prism 3 may be a reflecting surface, and a reflecting film 7 having a function of reflecting light may be provided thereon. If the end face 5 is the reflective layer 32 during the processing, it is not necessary to provide a reflective film 7 on the end face of the reflective layer 32, and the reflective layer 32 itself has a function of specularly reflecting light.

The pentagon 2, which has a cross section of the first right-angled triangle 1 or a combination of the rectangle 21 and the second right-angled triangle 22, has a plurality of right-angled reflecting walls, including the right-angled reflecting wall formed by two inclined planes 6 and the right-angled reflecting wall formed by the inclined plane 6 and the reflecting layer 32 or the end face 5, respectively, so that the microstructure unit has a 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. 5, when any light ray which is not parallel to the cross section of the columnar prism 3 strikes the reflective layer 32 or the reflective film 7 of the end face 5 from the incident surface, the light ray is reflected to an adjacent one of the inclined planes 6 through primary reflection, reflected to another inclined plane 6 through secondary reflection of the reflective film 7 coated on the inclined plane 6, and reflected back in parallel to the direction of the incident light after being shifted by D mm through tertiary reflection of the reflective film 7 coated on the inclined plane 6, and the retro-reflected light rays can be subjected to 3D imaging;

similarly, as shown in fig. 6, when any light ray not parallel to the cross section of the prism 3 impinges on the reflective film 7 of the reflective layer 32 or the end face 5 from the incident surface, the light ray may be reflected back for 3D imaging after multiple reflections;

for the incident light parallel to the cross section of the columnar prism 3, the light-induced retro-reflection 3D imaging can be realized by two reflections through the two inclined planes 6 according to the light path principle of fig. 1.

Consequently this column elementary prism 3 and constitute by a series of column elementary prisms 3 the utility model discloses a reflection type geometry holographic film based on two-dimensional characteristic has the light of arbitrary angle that shines on it and carries out contrary reflective function, can go back contrary retroreflection back after the light excursion distance d mm that shines on it, and d is the distance of crossing to incident ray of emergent ray and reflection type geometry holographic film bottom surface, and wherein d is less than or equal to 2 mm.

Preferably, as shown in fig. 7, the hypotenuse of the second right triangle 22 coincides with one side of the rectangle 21, the lengths of the short side and the long side of the rectangle 21 are a mm and b mm, respectively, and the length of the hypotenuse of the second right triangle 22 is a mm or b mm, wherein a is less than or equal to 2mm, and b is greater than or equal to 0 and less than or equal to 5 mm;

the allowable error range of the above-mentioned angles is within ± 5 °, including the right angles included in the first right- angled triangles 1 and 2 and the angle formed by the reflecting layer 32 and the length direction of the columnar prism 3, 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 angle error of the right angle (the right angle included in the first right triangle 1 and the pentagon 2) is within ± 5 °, the user experience is relatively satisfactory, and when the 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.

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 good;

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

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

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 utility model discloses a reflection type geometry holographic membrane based on two-dimensional characteristic is preferred to adopt the flexible membrane that flexible material made, and the screen that makes like this not only can satisfy folding, the coiling and accomodate the demand, and based on the characteristic of flexibility, in production course of working, difficult easy breaking that appears and produce residual stress scheduling problem, consider that the utility model discloses a reflection type geometry holographic membrane based on two-dimensional characteristic includes that flexible material is preferred PMMA membrane, IPMMA 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, cellulose nitrate membrane, EVA membrane, PE membrane, PVC membrane, novel amorphous type thermoplasticity, polyester film, Any one of an amorphous cycloolefin film and a modified bisphenol A epoxy resin film.

In order to further guarantee reliability, it is necessary to satisfy at the same time: its flagging length of horizontal centre gripping is L cm, and the number of times of can fifty percent discount is n, satisfies: l is more than or equal to 5 or n L is more than 9.

Wherein n is the number of times of folding, and the area is 100cm during test²The small sample is folded into a rectangle along the middle line position of the square (or within 1cm near the middle line position), then two flat plates are used for clamping the folded elementary membrane in the middle, a force not less than 10N is applied, the pressurizing maintaining time is more than or equal to 5s, then the sample is opened (at the moment, a folding test is completed once), whether the small sample generates local micro-cracks or is cut into two parts along the crease is checked, if the small sample does not generate the local micro-cracks or is cut into two parts is checked, the test is stopped, 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: taking a narrow strip with the width of 5cm +/-0.5 cm and the length of about 25cm, enabling one end of the narrow strip to be tightly attached to the horizontal reference table top, ensuring that the length of the narrow strip extending out of the table top is 20cm +/-1 cm, standing, and measuring the vertical height difference between the end point of the narrow strip extending out of the table top and the horizontal reference table top after the narrow strip is stabilized to be recorded as a 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 cylinder with the diameter less than 5cm, the whole elementary membrane is relatively flexible, and the fracture loss in the processing process is small. Generally, when L.gtoreq.5 cm, the elementary film can be wound into a cylindrical shape having a diameter of less than 5cm 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 can be obtained by simple experiments, and 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 7 disposed on the bottom surface 4, the end surface 5 and the inclined surface 6, wherein the bottom surface 4 is a light incident surface, so that the protective film disposed on the bottom surface 4 is a transparent protective film, and the end surface 5 and the inclined surface 6 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 a PMMA film, an IPMMA film, a PS film, a PC film, a PE film, a styrene acrylonitrile film, an MS film, a PET film, a PETG film, an ABS film, a PP film, a PA film, a SAN film, an MS film, an MBS film, a PEs film, a CR-39 film, a TPX film, a HEMA film, an F4 film, an F3 film, an EFP film, a PVF film, a PVDF film, an EP film, a PF film, an UP film, a cellulose acetate film, a cellulose nitrate film, an EVA film, a PE film, a PVC film, a novel amorphous thermoplastic polyester film, an amorphous cycloolefin film, and a 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 base element film: preparing a flexible holographic element film with transparent layer 31 and reflecting layer 32 arranged alternately, preferably a flexible holographic element film of publication No. CN110794504A, and its preparation method and application;

2) processing a right-angle triangular microstructure: a film having an undulating serrated surface formed by arranging the columnar element prisms 3 whose one surface is a flat surface and whose other surface is a pentagon 2 having a cross section of a first right-angled triangle 1 or a combination of a rectangle 21 and a second right-angled triangle 22 is cut in a direction perpendicular to the transparent layer 31 and the reflective layer 32 (a small error ± 5 ° is allowed in practical production), and a transparent protective film may be coated on the bottom surface 4 before or after this step;

3) coating a reflecting film: a reflection type geometric holographic film based on two-dimensional characteristics can be obtained by plating a layer of reflection film 7 on the end face 5 of the columnar element prism 3 and the inclined plane 6 where the right-angle side of the cross section is located, and in addition, a layer of protection film can be plated on the reflection film 7 after the reflection film 7 is plated.

It should be noted that, according to the actual requirement, the element film 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 preparation method of the flexible holographic element film of the publication number CN110794504A and the preparation method in the application, and can be applied to the utility model.

The present invention will be further described with reference to the following examples, which are intended to illustrate, but not limit the present invention: example 1

Preparing a flexible element film with the thickness of 1mm and arranged alternately between a transparent layer 31 and a reflecting layer 32, wherein the transparent layer 31 is made of a PC film, and the reflecting layer 32 is made of an aluminum foil reflecting film; cutting along the direction vertical to the transparent layer 31 and the reflecting layer 32 to obtain isosceles right triangle prisms with the section of the waste material being 1mm high, wherein the cut substrate film is a film with an undulating sawtooth-shaped surface formed by connecting a plurality of columnar substrate prisms 3 with the cross sections being 1mm high; then plating a layer of reflecting film 7 on the end face 5 and the inclined plane 6 of the film to obtain a reflecting type geometric holographic film based on two-dimensional characteristics, and finally plating a layer of protective film on the reflecting film 7 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 4 of the element film before cutting.

The holographic film prepared in the embodiment 1 comprises a series of isosceles right triangle columnar element prisms 3 with the cross section of 2mm of the hypotenuse, based on the light path principle of fig. 1, light is emitted from an incident surface, namely a bottom surface 4, and then is reflected back through a right-angle reflecting wall, and the existing offset d is not more than 2mm longer than the hypotenuse of the cross section, namely d is less than or equal to 2 mm.

Example 2

Preparing a flexible substrate film with the thickness of 0.5mm and arranged alternately between a transparent layer 31 and a reflecting layer 32, wherein the transparent layer 31 is made of a PC film, and the reflecting layer 32 is made of an aluminum foil reflecting film; cutting along the direction vertical to the transparent layer 31 and the reflecting layer 32 to obtain isosceles right triangle prisms with the cross section of the waste material being 0.5mm high, wherein the cut substrate film is a film with an undulating serrated surface formed by connecting a plurality of columnar substrate prisms 3 with the cross section being 0.5mm high isosceles right triangle; then plating a layer of reflecting film 7 on the end face 5 and the inclined plane 6 of the film to obtain a reflecting type geometric holographic film based on two-dimensional characteristics, and finally plating a layer of protective film on the reflecting film 7 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 4 of the element film before cutting.

The holographic film prepared in the embodiment 2 comprises a series of isosceles right triangle columnar element prisms 3 with the cross section of a hypotenuse of 1mm, based on the light path principle of fig. 1, light is emitted from an incident surface, namely a bottom surface 4, and then is reflected back through a right-angle reflecting wall, and the existing offset d is not larger than the length of the hypotenuse of the cross section by 1mm, namely d is not more than 1 mm.

Example 3

Preparing a flexible substrate film with the thickness of 0.1mm and arranged alternately between a transparent layer 31 and a reflecting layer 32, wherein the transparent layer 31 is made of a PC film, and the reflecting layer 32 is made of an aluminum foil reflecting film; cutting along the direction vertical to the transparent layer 31 and the reflecting layer 32 to obtain isosceles right triangle prisms with the cross section of the waste material being 0.1mm high, wherein the cut substrate film is a film with an undulating serrated surface formed by connecting a plurality of columnar substrate prisms 3 with the cross section being 0.1mm high isosceles right triangle; then plating a layer of reflecting film 7 on the end face 5 and the inclined plane 6 of the film to obtain a reflecting type geometric holographic film based on two-dimensional characteristics, and finally plating a layer of protective film on the reflecting film 7 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 4 of the element film before cutting.

The holographic film prepared in embodiment 3 includes a series of isosceles right triangle prism elements 3 with a cross section of 0.2mm hypotenuse, based on the light path principle of fig. 1, light is incident from the incident surface, i.e., the bottom surface 4, and then is reflected back through the right-angle reflecting wall, and the existing offset d is not greater than 0.2mm of the length of the hypotenuse of the cross section, i.e., d is not greater than 0.2 mm.

Example 4

Preparing a flexible element film with the thickness of 6mm and arranged alternately between transparent layers 31 and reflecting layers 32, wherein the transparent layers 31 are made of PC films, and the reflecting layers 32 are made of aluminum foil reflecting films; cutting along the direction vertical to the transparent layer 31 and the reflecting layer 32 to obtain isosceles right triangle prisms with the section of the waste material being 1mm high, wherein the cut substrate film is a film with an undulating zigzag surface formed by connecting a plurality of pentagonal 2 columnar substrate prisms 3 with the cross section being 1mm high isosceles right triangles and the rectangles with the short sides being 2mm and the long sides being 6 mm; and then plating a layer of reflecting film 7 on the end surface 5 of the film and the inclined plane 6 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, and finally plating a layer of protective film on the reflecting film 7 to protect the internal microstructure of the holographic film.

The holographic film prepared in embodiment 4 includes a series of cylindrical element prisms 3 having cross sections of pentagon 2 composed of an isosceles right triangle having a hypotenuse of 2mm and a rectangle having a short side of 2mm and a long side of 6mm, based on the optical path principle of fig. 1, light is incident from an incident surface, i.e., a bottom surface 4, and then is reflected back through a plurality of right-angle reflecting walls, and the existing offset d is not greater than 2mm, i.e., d is not greater than 2 mm.

Example 5

Preparing a flexible element film with the thickness of 2mm and arranged alternately between a transparent layer 31 and a reflecting layer 32, wherein the transparent layer 31 is made of a PC film, and the reflecting layer 32 is made of an aluminum foil reflecting film; cutting along the direction vertical to the transparent layer 31 and the reflecting layer 32 to obtain isosceles right triangle prisms with the cross section of the waste material being 0.5mm high, wherein the cut substrate film is a film with an undulating zigzag surface formed by connecting a plurality of pentagonal 2 columnar substrate prisms 3 formed by isosceles right triangles with the cross section being 0.5mm high and rectangles with the short sides being 1mm and the long sides being 1.5 mm; and then plating a layer of reflecting film 7 on the end surface 5 of the film and the inclined plane 6 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, and finally plating a layer of protective film on the reflecting film 7 to protect the internal microstructure of the holographic film.

The holographic film prepared in embodiment 5 includes a series of cylindrical element prisms 3 having cross sections of pentagons 2 formed by isosceles right triangles having a hypotenuse of 1mm and rectangles having a short side of 1mm and a long side of 1.5mm, and based on the principle of the optical path in fig. 1, light is emitted from an incident surface, i.e., a bottom surface 4, and then is reflected back by a plurality of right-angle reflecting walls, and the existing offset d is not greater than the length of the hypotenuse of the cross section by 1mm, i.e., d is not greater than 1 mm.

Example 6

Preparing a flexible element film with the thickness of 1mm and arranged alternately between a transparent layer 31 and a reflecting layer 32, wherein the transparent layer 31 is made of a PC film, and the reflecting layer 32 is made of an aluminum foil reflecting film; cutting along the direction vertical to the transparent layer 31 and the reflecting layer 32 to obtain isosceles right triangle prisms with the cross section of the waste material being 0.1mm high, wherein the cut substrate film is a film with an undulating sawtooth-shaped surface formed by connecting a plurality of columnar substrate prisms 3 of pentagon 2, the columnar substrate prisms 3 are formed by rectangles with the cross section being 0.1mm high and the short side being 0.2mm and the long side being 0.9 mm; and then plating a layer of reflecting film 7 on the end surface 5 of the film and the inclined plane 6 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, and finally plating a layer of protective film on the reflecting film 7 to protect the internal microstructure of the holographic film.

The holographic film prepared in the embodiment 6 includes a series of cylindrical element prisms 3 having cross sections of pentagons 2 formed by isosceles right triangles having a hypotenuse of 0.2mm and rectangles having a short side of 1mm and a long side of 1.5mm, based on the principle of the light path in fig. 1, light is emitted from an incident surface, i.e., a bottom surface 4, and then is reflected back by a plurality of right-angle reflecting walls, and there is an offset d which is not greater than the length of the hypotenuse of the cross section by 0.2mm, i.e., d is not greater than 0.2 mm.

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

for devices with higher display requirements, it is preferable that the transparent layer thickness of the elemental film is 0.5mm or less, while d is 0.5mm or less;

for the device with higher display detail requirement, the thickness of the transparent layer is preferably less than or equal to 0.3mm, and d is less than or equal to 0.3 mm;

the element film provided with the transparent layers 31 and the reflecting layers 32 which are arranged alternately is simply cut and processed based on two-dimensional characteristics, the operation is simple, large-scale and high-precision production is easy to realize, the production speed is high, the process cost is low, in addition, the element film is preferably a flexible element film, the problems of breakage, residual stress and the like which often occur in the hard material processing process can not occur in the cutting processing process, the product goodness is high, and the flexible characteristic ensures that the product of the utility model can meet the requirements of folding, winding, storage and the like;

based on the light path principle of right angle reflection wall, the utility model discloses a reflection-type geometry holographic membrane product based on two-dimensional characteristic can realize going back to the former direction reflection after a distance d of light skew that will shine on it, need not to realize contrary reflection imaging function with the help of extra lens component.

Reflection type geometric sense holographic membrane based on two-dimensional characteristic in reflection type geometric sense holographic display system's application, specifically do:

as shown in fig. 10, the reflective geometry holographic display system comprises an image source 100, a reflective geometry 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 reflection type geometric holographic screen 101 is used for reflecting light irradiated on the reflection type geometric holographic screen back in the original direction after the light is deviated by a distance d, and the reflection type geometric holographic film based on the two-dimensional characteristics is prepared by adopting the utility model;

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: a prismatic elementary prism (3) comprising a series of pentagons (2) having a cross-section of a first right triangle (1) or a combination of a rectangle (21) and a second right triangle (22);

a plurality of transparent layers (31) and reflecting layers (32) which are arranged at intervals are arranged in the columnar element prism (3) along the length direction, and a reflecting film (7) is arranged on an inclined plane (6) where a right-angle side of the cross section of the columnar element prism (3) is located and is used for performing mirror reflection on light;

the error ranges of right angles contained in the first right-angle triangle (1) and the pentagon (2) and angles formed by the reflecting layer (32) and the length direction of the columnar elementary prism (3) are within +/-5 degrees.

2. The two-dimensional feature-based reflective geometric holographic film of claim 1, wherein: the hypotenuse of the second right triangle (22) is coincident with one side of the rectangle (21) and has a mm length, the other side of the rectangle (21) has b mm length, wherein a is less than or equal to 2mm, and b is less than or equal to 0 and less than or equal to 5 mm.

3. The two-dimensional feature-based reflective geometric holographic film of claim 1, wherein: the first right-angle triangle (1) and/or the second right-angle triangle (22) are isosceles right-angle triangles.

4. The two-dimensional feature-based reflective geometric holographic film of claim 1, wherein: the end face (5) of the columnar elementary prism (3) is also provided with a layer of reflecting film (7).

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 sagging length of horizontal centre gripping of reflection-type geometry holographic film based on two-dimensional characteristic is L cm, and the number of times of can fifty percent discount is n, satisfies:

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 (4) of the columnar element prism (3) and the reflecting film (7), wherein the protective film arranged on the bottom surface (4) is a transparent protective film.

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