CN110794504A

CN110794504A - Flexible holographic base element film and preparation method and application thereof

Info

Publication number: CN110794504A
Application number: CN201911205198.6A
Authority: CN
Inventors: 王广军; 余为伟
Original assignee: Jingmen Exploration Dream Technology Co Ltd
Current assignee: Jingmen Exploration Dream Technology Co Ltd
Priority date: 2019-11-29
Filing date: 2019-11-29
Publication date: 2020-02-14
Anticipated expiration: 2039-11-29
Also published as: CN110794504B

Abstract

The invention relates to the field of 3D display, and discloses a flexible holographic base film and a preparation method and application thereof, wherein the whole base film is of a flexible bendable film structure and consists of a plurality of reflecting layers and transparent layers which are arranged in parallel at intervals, the reflecting layers are reflecting films with the function of reflecting light rays and are used for reflecting light rays, the transparent layers are used for transmitting light rays, the horizontal clamping sag length of the flexible holographic base film 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, compared with the extremely high processing cost of the existing high-precision optical glass processing technology, the material cost and the processing technology cost of the preparation method are low, the preparation method is suitable for large-scale popularization, and meanwhile, the 3D display holographic film prepared based on the flexible holographic element film can be made into a scroll screen, a curved screen and the like, has high flexibility, is convenient to store when not used, and occupies a small space.

Description

Flexible holographic base element film and preparation method and application thereof

Technical Field

The invention relates to the field of 3D display, in particular to a flexible holographic base film and a preparation method and application thereof.

Background

The 3D display technology is capable of displaying stereoscopic pictures in space, and is the mainstream direction of the next generation display technology. Although there are many solutions for realizing 3D display, such as volume display technology, stereo image pair technology, pepper's ear illusion, etc., there is no perfect 3D solution at present, and the main reason is the lack of optical glass element for large area light source manipulation.

The traditional optical glass processing technology can only process microstructures on a hundred-micron scale, the processing requirement of high-precision large-area optical glass and high processing cost are met, the optical glass is made of hard materials, and the problems of breakage, residual stress and the like are easily caused in the processing process.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: aiming at the problems that the processing cost of the traditional high-precision large-area optical glass is high in the prior art, and the yield is affected by the easy breakage of the glass, the residual stress and the like in the processing process, the flexible holographic base film and the preparation method and application thereof are provided.

In order to solve the technical problems, the technical scheme provided by the invention is as follows:

a flexible holographic element film is of a flexible bendable film structure and consists of a plurality of reflecting layers and transparent layers which are arranged in parallel at intervals, wherein the reflecting layers are reflecting films with the function of reflecting light rays and used for reflecting light rays, and the transparent layers are used for transmitting light rays;

the horizontal clamping sagging length of the flexible holographic base element film 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.

Furthermore, the thickness of the reflecting layer is 0.1-25 μm, the thickness of the transparent layer is 2-1 mm, and the thickness of the transparent layer is greater than that of the reflecting layer.

Further, the reflective film is any one of aluminum foil, iron foil, tin foil, zinc foil, copper foil, chromium foil, nickel foil and titanium foil.

Further, the transparent layer is a glue layer in a transparent state after being cured and/or a transmission film layer bonded by transparent glue.

Further, the transparent glue is any one of epoxy resin AB glue, UV glue, shadowless glue, transparent glass glue, transparent wood glue and transparent all-purpose glue.

Further, the transmission film is any one of a plastic film, a PMMA film, an lPMMA film, a PS film, a PC film, a styrene acrylonitrile film, an MS film, a PET film, a PETG film, an ABS film, a PP film, a PA film, an 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.

The invention also provides a preparation method of the flexible holographic base element film, which comprises the following steps:

1) preparing a cured pile:

a) stacking a plurality of pre-cut reflecting films layer by layer to form a reflecting film stack;

b) soaking the whole reflecting film stack in transparent glue water until the transparent glue water completely permeates into gaps among the reflecting films, and taking out the reflecting film stack;

c) standing and curing, wherein in the curing process, a certain pressure is applied to extrude out redundant glue in gaps between the reflecting films to control the thickness of a glue layer, and a curing stack arranged between the glue layer and the reflecting films is formed after curing, wherein the reflecting films are reflecting layers, and the glue layer is a transparent layer;

2) preparing a basic element film: grinding a smooth surface in the direction vertical to the plane of the reflecting layer, recording the smooth surface as a cutting reference surface, cutting a sheet from the solidified pile along the direction parallel to the cutting reference surface, recording the sheet as a base element film, wherein the newly cut surface on the solidified pile is the cutting reference surface for the next cutting, and repeating the cutting step to cut the solidified pile in the step 1) into a plurality of base element films.

Further, the cured pile described in step 1) may also be prepared by:

the reflecting film is placed on a plane, transparent glue is uniformly coated on the reflecting film, then another layer of reflecting film is stacked on the transparent glue layer, the stacking process is repeated to form a structure in which the reflecting film and the transparent glue are stacked alternately, and a cured pile is formed after standing and curing.

Further, at least one layer of the transmission film is added between adjacent reflection films in a stacking mode.

Further, before the cutting in the step 2), a transparent protective film is bonded on the cutting reference surface by using transparent glue, and the element film with the transparent protective film is obtained after the cutting, or one or two surfaces of the element film after cutting is bonded with a transparent protective film, wherein the transparent protective film is any one of glass, acrylic, plastic film, PMMA film, LPMMA film, PS film, PC 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, nitric acid film, EVA film, PE film, PVC film, novel amorphous thermoplastic polyester film, amorphous cycloolefin film and modified bisphenol A epoxy film.

Further, the flexible holographic element film is applied to the preparation of a flexible 3D display holographic film, and specifically comprises the following steps: the two flexible element films are bonded together up and down by using transparent glue, a flexible 3D display holographic film is formed after curing, the reflecting layers and the transparent layers on the two element films are staggered at an included angle theta to form a grid when bonding, the theta is more than or equal to 87 degrees and less than or equal to 93 degrees, and the horizontal clamping sagging length L (cm) of the flexible 3D display holographic film and the number n of folding times meet the following requirements: n L >9 or L is more than or equal to 5, and the element film is provided with a flexible transparent protective film or is not provided with the transparent protective film.

Further, the element film with the transparent protective film is applied to the preparation of a hard 3D display holographic projection screen, and specifically comprises the following steps:

one element film with a hard transparent protective film (such as glass or acrylic) is bonded with the other element film or the element film with the transparent protective film up and down by using transparent glue, and the reflecting layers and the transparent layers on the two element films are staggered at an included angle theta to form a grid, wherein the theta is more than or equal to 87 degrees and less than or equal to 93 degrees.

Compared with the prior art, the invention has the advantages that:

the flexible holographic base film with the micron-sized ultra-fine structure can be prepared without a complex film coating process, and compared with the extremely high processing cost of the existing high-precision optical glass processing process, the preparation method has the advantages that the material cost and the processing process cost are low, and the preparation method is suitable for large-scale popularization; meanwhile, the holographic element film with the grids is flexible, so that the holographic element film is not easy to break when being processed, the problems of residual stress generated in the glass processing process and the like are avoided, the yield is greatly improved, the holographic element film can be made into a scroll screen, a curved screen and the like when being specifically applied, the flexibility is higher, the holographic element film is convenient to store when not being used, and the occupied space is smaller.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings 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.

Figure 1 is a front view of a structure of a elementary film 1 in which the transparent layer 3 is a cured layer of transparent glue,

figure 2 is a front view of a structure in which a transparent layer 3 is a elementary film 1 to which a transmission film is bonded by transparent glue,

figure 3 is an enlarged view of a portion of i in figure 2,

FIG. 4 is a structural view of a cell film 1 with a transparent protective film,

figure 5 is a perspective view of a 3D display holographic film structure,

figure 6 is a front view and a top view of figure 5,

figure 7 is a diagram of an aero-levitation display system,

figure 8 is a schematic diagram of the imaging optical path of a 3D display holographic film,

figure 9 is a side view of figure 8,

figure 10 is a schematic diagram of the partial internal ray reflection at ii in figure 9,

figure 11 is a diagram of the effect of a flexible holographic screen for an air suspension display system application,

FIG. 12 is a graph showing the simulation effect of the imaging light path of the holographic film in 3D,

the reference numbers are as follows:

a base film 1, a reflective layer 2, a transparent layer 3, a grid 4, a holographic projector 10, a projection screen 20, an interactive response unit 30, a processor 40, and a motion actuator 50.

Detailed Description

The following detailed description of the present invention is given for the purpose of better understanding technical solutions of the present invention by those skilled in the art, and the present description is only exemplary and explanatory and should not be construed as limiting the scope of the present invention in any way.

Referring to fig. 1 to 12, the present invention provides a flexible holographic element film, wherein the whole element film 1 is a flexible bendable film structure, the horizontal clamping sagging length is l (cm), the number of folding times is n, and the following requirements are satisfied: l is more than or equal to 5 or n L is more than 9;

in practical application, in order to ensure the reliability as much as possible, n is preferably more than or equal to 2 and L is more than 9;

it should be noted that, where n is the number of times of folding, the area taken during the test is 100cm²The square flexible holographic base film 1 is characterized in that the base film 1 is folded into a rectangle along the middle line position of the square (or within 1cm near the middle line position), then the folded base film 1 is clamped between two flat plates, 10-20N of force is applied to pressurize for 3-5 s, then the base film 1 is opened (at the moment, a folding test is completed once), whether the base film 1 generates local micro-cracks or is broken into two parts along creases is checked, if not, the test is repeated until the base film 1 generates local micro-cracks or is broken into two parts, 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 element film 1 with the width of 5cm +/-0.5 cm and the length of about 25cm, enabling one end of the narrow strip element film to be tightly attached to a 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 droop length L;

the test is an accelerated test means, the reliability of a sample in a long-term use process can be rapidly judged, the flexible 3D display base element film 1 needs to bear operations such as winding, storage, opening and the like for many times when being applied, the operation is calculated according to the designed 5-year service life, the whole life cycle needs to be stored and unfolded for about 10000 times, and in order to accelerate the evaluation of the service life of the base element film 1, the folding test and the horizontal clamping droop length test are adopted in the invention;

when n is greater than L9, the larger n is, the smaller the ultimate bending curvature radius of the base element film 1 is, the stronger the breaking resistance is, and meanwhile, the larger L is, the better the flexibility of the base element film 1 is, the more difficult the base element film 1 structure is to be damaged due to winding, experiments show that the base element film 1 structure is basically equivalent to 10000 times of opening and closing tests when n is greater than L9, 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 a product, and the customer experience is reduced;

in practical application, some transparent adhesive tapes and transparent films which are relatively hard after being cured can be used, so that the prepared flexible holographic base film 1 can be broken when being folded in half, but the structure can not be damaged when being wound, and the flexible holographic base film is also suitable for winding screens. For such materials, as long as the prepared base membrane 1 can be wound into a cylinder with the diameter less than 5cm, the whole base membrane 1 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.

As shown in fig. 1 to 3, the substrate film 1 is composed of a plurality of reflective layers 2 and transparent layers 3 arranged alternately, the reflective layers 2 are metal foils capable of reflecting light or other reflective films with reflective function, the reflective layers 2 are used for reflecting light, it should be noted that if the reflective layers are too thick, too much light is shielded, the thinner the reflective layers are, but in consideration of the difficulty and cost of the process preparation, the reflective films are aluminum foils, iron foils, tin foils, zinc foils, copper foils, chromium foils, nickel foils, titanium foils or other reflective films capable of reflecting light, and the thickness of the reflective films is 0.1 μm to 25 μm;

the transparent layer 3 is a transparent glue layer or a transmission film adhered between adjacent reflecting layers and used for transmitting light, and the thickness of the transparent layer 3 is always larger than that of the reflecting layer 2;

wherein the transparent glue can be any one of UV glue, shadowless glue, transparent glass glue, transparent wood glue and transparent all-purpose glue, and the thickness of the transparent layer can be controlled to be 2 mu m-1 mm;

the transmission film may be any one of a transparent plastic film, a PMMA film, an lPMMA 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.

The invention also provides a preparation method of the flexible holographic base element film, which comprises the following specific steps:

1) preparing a cured pile:

b) the whole reflecting film stack is soaked in transparent glue water until the transparent glue water completely permeates into gaps among the reflecting films and then is taken out, and it is required to be explained that the reflecting films are stacked and then are fluffy, gaps exist among the layers, so that when the reflecting films are contacted with the transparent glue water, the transparent glue water can go deep into the layers under the action of surface tension and is completely filled, bubbles are not easy to appear, and the glue water has a bonding effect on various materials, so that the reflecting films are very easy to infiltrate the surfaces of the reflecting films, and the transparent glue water can be filled among the reflecting films under the action of the surface tension and is similar to a capillary phenomenon;

c) standing and curing, wherein in the curing process, a certain pressure is applied to extrude out redundant glue in gaps between the reflecting films so as to control the thickness of a glue layer, and a curing stack arranged between the glue layer and the reflecting films is formed after curing, wherein the reflecting films are reflecting layers 2, and the glue layer is a transparent layer 3;

2) preparing a basic element film: grinding a smooth surface in the direction vertical to the plane of the reflecting layer, marking the smooth surface as a cutting reference surface, cutting a sheet from the solidified pile along the direction parallel to the cutting reference surface, marking the sheet as a base element film 1, wherein the newly cut surface on the solidified pile is the cutting reference surface of the next cutting, and repeating the cutting step to cut the solidified pile in the step 1) into a plurality of base element films 1.

Wherein, the preparation of the curing stack in the step 1) can also adopt the following mode:

In order to reduce the amount of transparent glue and further increase the thickness of the transparent layer 3, at least one transparent transmission film as described above may also be adhered between the two reflective layers 2 by transparent glue.

It should be noted that the transparent layer 3 is formed by curing transparent glue or by bonding one or more layers of transparent transmission films as described above with transparent glue, and based on the materials of the transparent glue and the transmission films selected above, the cured transparent layer 3 has better flexibility, and the substrate film 1 has better flexibility after being cut into the substrate film 1.

Reference may be made in particular to the thicknesses of the reflective layer 2, the transparent layer 3 and the elementary film 1 in the following table:

thickness of reflecting layer (mum)	Thickness of transparent layer (μm)	Elementary film thickness (. mu.)m)
			0.1	1	1
1	2	2
			5	10	10
10	20	20
			15	30	30
20	50	50
			25	100	100
25	300	300
			25	1000	1000

The following examples are further illustrative of the method for manufacturing a flexible holographic element film according to the present invention, wherein the flexible holographic element film is made of transparent epoxy resin AB glue with a thickness of 20 μm and a reflective layer 2 of 10 μm aluminum foil and a transparent layer 3 of 20 μm, and the method comprises the following steps:

example 1

1) Preparing a cured pile:

a) 10000 pre-cut aluminum foil reflecting films with the size of 50cmX50cm and the thickness of 10 mu m are stacked layer by layer to form an aluminum foil reflecting film stack;

b) the aluminum foil reflecting film stack is wholly soaked in transparent epoxy resin AB glue until the epoxy resin AB glue completely permeates into gaps among the aluminum foil reflecting films and then is taken out;

c) standing and curing for 3 hours, wherein in the curing process, as the epoxy resin AB glue is permeated between the aluminum foil reflecting films, the thickness of the aluminum foil reflecting film stack is increased, the thickness of the aluminum foil reflecting film stack is controlled by applying a certain pressure, so as to control the thickness of the glue layer, in the embodiment, the thickness of the reflecting film stack is controlled to be 30cm by the pressure, a cured stack with the thickness of 30cm is formed after curing, wherein the reflecting layer 2 and the transparent layer 3 are arranged alternately, the average thickness of the transparent layer 3 formed by curing the epoxy resin AB glue is 20 μm,

the thickness of the reflecting layer 2 formed by the aluminum foil reflecting film is 10 μm;

2) preparing a basic element film: grinding a smooth surface in the direction vertical to the plane of the reflecting layer, marking as a cutting reference surface, cutting a sheet with the thickness of 100 mu m from the solidified pile along the direction parallel to the cutting reference surface by using a laser cutting machine, then grinding and polishing the sheet into 20 mu m, marking as a base element film 1, wherein the newly cut surface on the solidified pile is the cutting reference surface for the next cutting, repeating the cutting step, and cutting, grinding and polishing the solidified pile in the step 1) into a plurality of base element films 1.

Example 2

The difference from example 1 is that the cured mass is prepared:

when the aluminum foil reflecting films are stacked layer by layer, a PE transmission film with the thickness of 10 micrometers is added between the adjacent aluminum foil reflecting films, when the aluminum foil reflecting films are cured, the thickness of the aluminum foil reflecting film stack is controlled to be 30cm by applying pressure to the aluminum foil reflecting film stack, the applied pressure extrudes redundant glue in gaps between the reflecting films, so that the thickness of the reflecting layer 2 of the finally cured stack is 10 micrometers, the thickness of the transparent layer 3 is 20 micrometers, and the transparent layer 3 consists of an epoxy resin AB glue curing layer and a PE transmission film;

the rest of the procedure was the same as in example 1.

Example 3

1) Preparing a cured pile:

placing an aluminum foil reflecting film which is cut in advance and has the size of 50cmX50cm and the thickness of 10 mu m on a plane, then uniformly coating a layer of transparent epoxy resin AB glue on the aluminum foil reflecting film, then stacking another layer of aluminum foil reflecting film on a glue layer, repeating the stacking process to obtain a structure with alternately stacked reflecting layers 2 and transparent layers 3, obtaining a cured stack after the glue is cured, and controlling the thickness of the transparent layer 3 to be 20 mu m by controlling the glue coating amount of each layer;

the rest of the procedure was the same as in example 1.

Example 4

According to the procedure of example 3, a PE transmission film with a thickness of 10 μm was added between adjacent aluminum foil reflection films during the preparation of the cured stack, the thickness of the transparent layer 3 in the obtained cured stack was 20 μm, the transparent layer 3 was composed of the cured layer of the epoxy AB glue and the PE transmission film, the thickness of the transparent layer 3 was controlled to be 20 μm by the same glue application amount, and the rest of the procedure was the same as that of example 3.

In the actual preparation process, different glues are adopted, the standing and curing time is different, the glue can be properly heated according to the glue characteristics when used, for example, when epoxy resin AB glue is used, the glue can be heated to about 28 ℃, the curing process is accelerated, and meanwhile, bubbles can be prevented from being generated;

in the actual cutting process, a high-precision wire cutting machine can be used for cutting, and a transparent protective film can be bonded on the cutting reference surface by using transparent glue before cutting, as shown in fig. 4, the element film 1 with the transparent protective film is obtained after cutting, and the transparent protective film is a transparent glass, acrylic, plastic film, PMMA film, lPMMA film, PS film, PC 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, nitrate film, EVA film, PE film, PVC film, amorphous cycloolefin film, and modified bisphenol a epoxy resin film;

the base film 1 can be further thinned by grinding and polishing or other means in actual application;

the thickness of the element film 1 without the transparent protective film can be reduced by grinding and polishing on both sides or one side;

for the element film 1 with the transparent protective film, thinning can be performed by grinding and polishing the non-transparent protective film side;

by adopting the preparation method, the holographic elementary film with the micron-sized ultra-fine structure can be prepared without a complex film coating process, and compared with the extremely high processing cost of the existing high-precision optical glass processing process, the preparation method provided by the invention has the advantages that the material cost and the processing process cost are low, the method is suitable for large-scale popularization, and meanwhile, the holographic elementary film with the grid is flexible, so that the holographic elementary film is not easy to break when being processed, the problems of residual stress and the like generated in the glass processing process can be avoided, the yield is greatly improved, when in specific application, the holographic elementary film can be made into a scroll type screen, a curved screen and the like, the flexibility is high, the storage is convenient when not being used, and the occupied space is small.

As shown in fig. 5 and 6, the flexible holographic substrate film 1 prepared by the method for preparing a flexible holographic substrate film according to the present invention is applied to preparing a flexible 3D display holographic film, and specifically includes:

two flexible substrate films 1 are bonded together up and down by using transparent glue, a flexible 3D display holographic film is formed after curing, the substrate films 1 are provided with flexible transparent protective films or are not provided with the transparent protective films, the reflecting layers 2 and the transparent layers 3 on the two substrate films 1 are staggered at an included angle theta to form grids 4 during bonding, wherein the theta is more than or equal to 87 degrees and less than or equal to 93 degrees, and preferably 90 degrees;

the horizontal clamping sagging length of the flexible holographic base element film 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, the whole flexible 3D display holographic film is flexible, so the flexible 3D display holographic film can be applied to a scroll screen, can be wound and stored on a scroll when not used, and can be unfolded to form a plane when used, and meanwhile, the flexible 3D display holographic film can be adhered to a transparent flat plate to be changed into a hard screen when used.

In view of the practical application, it may be necessary to produce an oversized 3D display holographic film, where the microstructure of the elementary film 1 is correspondingly relatively "rough", and the thickness of the transparent layer 3 may be up to 1mm or even thicker.

In practical application, the elementary film 1 with the transparent protective film can be directly applied to a hard 3D display holographic projection screen, specifically:

one element film 1 with a hard transparent protective film (such as glass or acrylic) is vertically bonded with the other element film 1 or the element film 1 with the transparent protective film by using transparent glue, and the reflecting layers 2 and the transparent layers 3 on the two element films 1 are staggered at an included angle theta to form a grid 4, wherein theta is more than or equal to 87 degrees and less than or equal to 93 degrees, preferably 90 degrees, and when the transparent protective film is made of other materials except for hard glass or acrylic materials, when the thickness of the transparent protective film is larger, the hard transparent protective film is formed, and the hard 3D display holographic projection screen is also suitable.

Although the transparent protective film of the element film 1 with the transparent protective film is attached before cutting, in actual use, the transparent protective film may be attached after cutting, and one or both sides may be attached, and the material of the transparent protective film is selected according to the actual use requirements.

As shown in fig. 7, the flexible 3D display holographic film or the rigid 3D display holographic projection screen is applied to an air suspension display:

the air suspension display system comprises a holographic projector 10, a projection screen 20 prepared on the basis of the flexible holographic base film 1, an interactive response unit 30 and a processor 40, wherein the holographic projector 10 is used for projecting a 3D holographic image with depth in a space, the 3D holographic image is positioned on one side of the projection screen 20, the projection screen 20 is used for converting the 3D image with depth information projected by the holographic projector 10 to a conjugate position, a movement executing mechanism 50 is arranged on the holographic projector 10 and/or the projection screen 20, and the interactive response unit 30 is used for sensing user interactive action information and the position of eyes of a user;

the holographic projector 10, the interactive response unit 30 and the motion actuator 50 are respectively electrically connected with the processor 40, the processor 40 sends projection data information to the holographic projector 10 to control the projection picture and the picture depth of the holographic projector 10, and controls the motion actuator 50 to adjust the relative position of the holographic projector 10 and the projection screen 20 according to the received positioning information of the human eyes acquired by the interactive response unit 30, or controls the system to make corresponding response according to the identified interactive action information of the user;

preferably, the projection screen 20 is the flexible 3D display holographic film, and is flexible, so that it can be designed as a scroll screen, and can be rolled and stored on a scroll when not in use, and can be unfolded to form a plane when in use;

the projection screen 20 may also be a rigid 3D display holographic projection screen as described above, and may also be attached to a transparent plate to become a rigid screen in use, based on the flexibility of the flexible 3D display holographic film.

Imaging principle: as shown in fig. 8 to 12, the projection light is reflected by the reflective layer inside the 3D display hologram film, and there is one or more reflections, and a 3D image is formed at a conjugate position with respect to the 3D display hologram film, and the final imaging effect of the imaging principle is consistent with that of a flat lens made of a negative refractive index material.

The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.

Claims

1. A flexible holographic base film, comprising: the whole element film (1) is of a flexible bendable film structure and consists of a plurality of reflecting layers (2) and transparent layers (3) which are arranged in parallel at intervals, wherein the reflecting layers (2) are reflecting films with light reflecting functions and used for reflecting light, and the transparent layers (3) are used for transmitting light;

2. A flexible holographic element film according to claim 1, wherein: the thickness of the reflecting layer (2) is 0.1-25 mu m, the thickness of the transparent layer (3) is 2-1 mm, and the thickness of the transparent layer (3) is larger than that of the reflecting layer (2).

3. A flexible holographic element film according to claim 1, wherein: the reflecting film is any one of aluminum foil, iron foil, tin foil, zinc foil, copper foil, chromium foil, nickel foil and titanium foil.

4. A flexible holographic element film according to claim 1, wherein: the transparent layer (3) is a glue layer which is in a transparent state after being cured and/or a transmission film layer which is bonded through transparent glue.

5. A flexible holographic base film according to claim 4, wherein: the transparent glue is any one of epoxy resin AB glue, UV glue, shadowless glue, transparent glass glue, transparent wood glue and transparent all-purpose glue.

6. A flexible holographic base film according to claim 4, wherein: the transmission film is any one of a plastic film, a PMMA film, an lPMMA film, a PS film, a PC film, a styrene acrylonitrile film, an MS film, a PET film, a PETG film, an ABS film, a PP film, a PA film, an 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, an amorphous cycloolefin film and a modified bisphenol A epoxy resin film which are made of transparent materials.

7. The method of claim 1, comprising the steps of:

1) preparing a cured pile:

c) standing and curing, wherein in the curing process, a certain pressure is applied to extrude out redundant glue in gaps between the reflecting films to control the thickness of a glue layer, and a curing stack arranged between the glue layer and the reflecting films is formed after curing, wherein the reflecting films are reflecting layers (2), and the glue layer is a transparent layer (3);

2) preparing a basic element film: grinding a smooth surface in the direction vertical to the plane of the reflecting layer (2) to be recorded as a cutting reference surface, cutting a sheet from the solidified pile along the direction parallel to the cutting reference surface to be recorded as a substrate film (1), wherein the newly cut surface on the solidified pile is the cutting reference surface of the next cutting, repeating the cutting step, and cutting the solidified pile of the step 1) into a plurality of substrate films (1).

8. The method of claim 7, wherein the method comprises: the cured mass described in step 1) can also be prepared by:

9. The method of producing a flexible holographic base film according to claim 7 or 8, wherein: adding at least one transmissive film according to claim 6 between two adjacent reflective films in a stacked manner.

10. The method of producing a flexible holographic base film according to claim 7 or 8, wherein: before the cutting in the step 2), a transparent protective film is bonded on the cutting reference surface by using transparent glue, and the cutting is performed to obtain a basic element film (1) with the transparent protective film, or one surface or two surfaces of the basic element film (1) after the cutting is completed are bonded with a transparent protective film, wherein the transparent protective film is any one of transparent glass, acrylic, plastic film, PMMA film, lPMMA film, PS film, PC 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, amorphous cycloolefin film and modified bisphenol A epoxy film.

11. Use of a flexible holographic substrate film prepared by a method of preparation of a flexible holographic substrate film according to claim 7 or 8, wherein: the flexible holographic base film (1) is applied to preparing a flexible 3D display holographic film, and specifically comprises the following steps:

two flexible substrate films (1) are bonded together up and down by using transparent glue, a flexible 3D display holographic film is formed after curing, the reflecting layer (2) and the transparent layer (3) on the two substrate films (1) are staggered by an included angle theta to form a grid (4) during bonding, the theta is more than or equal to 87 degrees and less than or equal to 93 degrees, and the horizontal clamping sagging length L (cm) of the flexible 3D display holographic film and the folding times n meet the following requirements: n L >9 or L is more than or equal to 5, and the element film (1) is provided with a flexible transparent protective film or is not provided with the transparent protective film.

12. Use of a base film with a transparent protective film according to claim 10, wherein: the application of the base element film (1) with the transparent protective film in the preparation of the hard 3D display holographic projection screen specifically comprises the following steps:

one element film (1) with a hard transparent protective film is adhered to the other element film (1) or the element film (1) with the transparent protective film up and down by using transparent glue, and the reflecting layer (2) and the transparent layer (3) on the two element films (1) are staggered at an included angle theta to form a grid (4), wherein the theta is more than or equal to 87 degrees and less than or equal to 93 degrees.