CN114721081A - Low-adhesion holographic film, preparation method thereof and application of low-adhesion holographic film in preparation of AR (augmented reality) display element - Google Patents
Low-adhesion holographic film, preparation method thereof and application of low-adhesion holographic film in preparation of AR (augmented reality) display element Download PDFInfo
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/32—Holograms used as optical elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/14—Protective coatings, e.g. hard coatings
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
- G02B27/0103—Head-up displays characterised by optical features comprising holographic elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
- G02B27/0172—Head mounted characterised by optical features
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
- G02B27/0172—Head mounted characterised by optical features
- G02B2027/0174—Head mounted characterised by optical features holographic
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Abstract
The invention provides a low-adhesion holographic film for preparing an AR display element, which comprises the following components in sequence: the holographic optical film comprises a substrate, a low-bonding-force layer, an optical film layer, a holographic exposed photopolymer thin layer and a protective film layer. Compared with the prior art, the low-bonding-force holographic film provided by the invention adopts a structure of the low-bonding-force layer and the holographic film layer, so that the exposure uniformity of the holographic film can be ensured, and the holographic film has the advantages of low viscosity, easiness in tearing, no adhesive residue and the like after holographic exposure treatment. The invention also provides a holographic film preparation method which is friendly in process and strong in universality, and particularly meets the application of the holographic film on novel curved surface display devices such as AR glasses, AR-HUDs and the like.
Description
Technical Field
The invention belongs to the technical field of optical materials, and particularly relates to a low-bonding-force holographic film, a preparation method thereof and application thereof in preparing an AR display element.
Background
Photosensitive holographic materials have been widely used as a special information storage material in the field of laser anti-counterfeiting technology. The holographic material forms a volume holographic grating with refractive index difference after laser interference holographic exposure treatment, and the structure formed by the holographic grating is an AR display element with excellent performance, so that the application of the holographic grating in the fields of AR glasses, AR head-up display (AR-HUD) and the like has been widely focused and researched.
The application of the holographic material in AR display is to form a holographic grating through holographic exposure, and the holographic material is required to have a flat surface during exposure, so that stray light interference is avoided, and interference fringes caused by reflection are prevented from being influenced. The general practice is to coat the holographic material directly onto a planar substrate on which the holographic grating is formed after exposure, but this method is only to use the layer of holographic material together with the planar substrate as the final AR display element, greatly limiting its application. For example, some non-planar interfaces such as lenses with refractive correction and automobile windshields cannot be used as substrates for holographic material coating and exposure (the substrates for exposure must be planar), and AR display of a curved interface cannot be realized, so that a holographic film with a holographic volume grating structure is required for curved surface fitting in practical application.
The photosensitive holographic film is suitable for roll-to-roll coating in a production line, and good in mass production, so that the photosensitive holographic film is the preferable scheme for AR display. The holographic film is attached to a planar substrate to guarantee the exposure effect, can be detached from the planar substrate after exposure to be attached to other planar interfaces such as an optical prism, planar glass or resin and the like again, and can also be attached to non-planar interfaces such as a dioptric lens and an automobile windshield and the like, so that various forms of AR display elements such as AR glasses or AR-HUD and the like can be obtained. In addition, because the plane substrate originally used for exposure can be removed, the holographic film with the holographic body grating structure does not additionally increase the thickness and the weight of the AR display element, which is very helpful for the wearing comfort of AR glasses and also greatly beneficial for the display of AR-HUD. Therefore, a holographic film with low adhesive force and easy tearing has been developed.
Disclosure of Invention
In view of the above, the present invention provides a low adhesion holographic film, a method for preparing the same, and applications of the low adhesion holographic film in preparing AR display elements.
The invention provides the application of a low-adhesion holographic film in preparing an AR display element, wherein the low-adhesion holographic film comprises the following components in sequence:
the film comprises a substrate, a low-adhesion layer, an optical film layer, a holographic exposed photopolymer film layer and a protective film layer.
Preferably, the low adhesion holographic film is used to make non-planar AR display elements.
Preferably, the low adhesive force layer has a peel force of less than 20gf/25 mm.
Preferably, the low-adhesion layer is an electrostatic adsorption layer, a low-adhesion adhesive layer or a UV (ultraviolet) viscosity-reducing adhesive layer;
the protective film layer is selected from a TAC film, a PMMA film, a COP film, a PET film, a PE film or an OCA film.
Preferably, the thickness of the optical film layer is 20-80 μm.
Preferably, the thickness of the photopolymer film layer after holographic exposure is 15-50 μm.
The invention also provides a preparation method of the low-adhesion holographic film, which comprises the following steps:
s1) coating the photopolymer material on the optical film layer under the condition of keeping out of the sun, and curing at low temperature to form a film to obtain the optical film layer of the composite photopolymer film layer;
s2) attaching a protective film to the surface of the photopolymer film layer of the optical film layer of the composite photopolymer film layer to obtain a holographic film;
s3) coating low-adhesion-force glue on the surface of the substrate, then attaching the holographic film, and attaching the surface of the optical film layer of the holographic film with the low-adhesion-force glue to obtain the holographic film of the composite substrate;
or coating low-adhesion glue on the surface of the optical film layer of the holographic film, and attaching the holographic film to the substrate to obtain the holographic film of the composite substrate;
or performing corona treatment on the surface of the optical film layer of the holographic film, and attaching the optical film layer to the substrate to obtain the holographic film of the composite substrate;
s4) carrying out holographic exposure on the holographic film of the composite substrate to obtain a low-adhesion holographic film with a display function;
s5) separating the holographic film obtained in step S4 from the substrate, and directly bonding the separated holographic film to the surface of the terminal substrate to obtain various forms of AR display elements.
Preferably, the linear speed of coating in the step S1) is 10-60 m/min; the temperature for low-temperature curing film forming is 40-80 ℃.
Preferably, the speed of adhering the protective film in the step 2) is 20-60 m/min.
Preferably, the step S2) of attaching the protective film further includes rolling to obtain a holographic film; the tension of the winding is 6 multiplied by 10 to 18 multiplied by 10N.
The invention provides the use of a low adhesion holographic film in the manufacture of a non-planar AR display element, the low adhesion holographic film comprising, stacked in sequence: the film comprises a substrate, a low-adhesion layer, an optical film layer, a holographic exposed photopolymer film layer and a protective film layer. Compared with the prior art, the low-bonding-force holographic film provided by the invention adopts a structure of the low-bonding-force layer and the holographic film layer, so that the exposure uniformity of the holographic film can be ensured, and the holographic film has the advantages of low viscosity, easiness in tearing, no adhesive residue and the like after holographic exposure treatment. The invention also provides a holographic film preparation method which is friendly in process and strong in universality, and particularly meets the application of the holographic film on novel curved surface display devices such as AR glasses, AR-HUDs and the like.
Drawings
FIG. 1 is a schematic flow diagram illustrating the preparation of a low adhesion holographic film provided by the present invention;
fig. 2 is a photograph of a scene showing a combination of real and virtual images displayed by the AR smart glasses prepared in embodiment 2 of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides the application of a low-adhesion holographic film in preparing an AR display element, wherein the low-adhesion holographic film comprises the following components in sequence: the film comprises a substrate, a low-adhesion layer, an optical film layer, a holographic exposed photopolymer film layer and a protective film layer.
Further preferably, the present invention provides the use of a low adhesion holographic film in the manufacture of a non-planar AR display element.
In the present invention, the substrate serves as a flat plane to support the film when used for holographic exposure, and thus the substrate is preferably a transparent planar substrate, more preferably glass or plastic.
A low adhesion layer is arranged on the surface of the substrate; the peeling force of the low-adhesion layer is preferably less than 20gf/25mm, so that the holographic film can be removed from the substrate in the subsequent use process, and the technical problem of the AR holographic film in the attaching and transferring processes before and after holographic exposure is solved; the low-adhesion layer is preferably an electrostatic adsorption layer, a low-adhesion adhesive layer or a UV adhesive layer.
An optical film layer is arranged on the surface of the low-adhesion layer; the thickness of the optical film layer is preferably 20-80 μm, and more preferably 40-80 μm; in the embodiments provided by the present invention, the thickness of the optical film layer is specifically 40 μm, 60 μm, or 80 μm; the type of the optical film layer is not particularly limited as long as it is known to those skilled in the art, and a TAC film or a PMMA film is preferred in the present invention.
The surface of the optical film layer is provided with a holographic exposed photopolymer film layer; the photopolymer film layer is formed of a photopolymer material; the photopolymer material is not particularly limited as long as it is a photopolymer material known to those skilled in the art, and is preferably a photopolymer layer disclosed in chinese patent publication No. CN 110603495A; the thickness of the photopolymer film layer after holographic exposure is preferably 10-80 μm, more preferably 20-80 μm, and further preferably 40-80 μm.
Because the photopolymer film layer is sensitive to the environment, a protective film is arranged on the surface of the photopolymer film layer after holographic exposure; the protective film is preferably a TAC film, a PMMA film or a COP film; the thickness of the protective film is preferably 10-80 μm, more preferably 20-80 μm, and still more preferably 40-60 μm.
The low-bonding-force holographic film provided by the invention adopts a structure of adding the low-bonding-force layer and the holographic film layer, so that the exposure performance of the holographic film can be ensured, and the low-bonding-force holographic film has the advantages of low viscosity, easiness in tearing, no adhesive residue and the like after holographic exposure treatment. The method can be well attached to a plane interface or a curved interface, solves the technical problem of the attachment and transfer process of the AR holographic film before and after holographic exposure, provides a general holographic film preparation method, and meets the application requirements of the AR holographic film preparation method on novel display devices such as AR glasses and AR-HUD.
The invention also provides a low-adhesion holographic film, comprising, stacked in sequence: the film comprises a substrate, a low-adhesion layer, an optical film layer, a holographic exposed photopolymer film layer and a protective film layer.
The substrate, the low adhesion layer, the optical film layer, the holographically exposed photopolymer film layer and the protective film layer are the same as above, and are not described herein again.
The invention also provides a preparation method of the low-adhesion holographic film, which comprises the following steps: s1) coating the photopolymer material on the optical film layer under the condition of keeping out of the sun, and curing at low temperature to form a film to obtain the optical film layer of the composite photopolymer film layer; s2) attaching a protective film to the surface of the photopolymer film layer of the optical film layer of the composite photopolymer film layer to obtain a holographic film; s3) coating low-adhesion-force glue on the surface of the substrate, then attaching the holographic film, and attaching the surface of the optical film layer of the holographic film with the low-adhesion-force glue to obtain the holographic film of the composite substrate; or coating a low-adhesion adhesive on the surface of the optical film layer of the holographic film, and attaching the optical film layer to the substrate to obtain the holographic film of the composite substrate; or performing corona treatment on the surface of the optical film layer of the holographic film, and attaching the optical film layer to the substrate to obtain the holographic film of the composite substrate; s4) carrying out holographic exposure on the holographic film of the composite substrate to obtain a low-adhesion holographic film; s5) separating the holographic film obtained in step S4 from the substrate, and directly bonding the separated holographic film to the surface of the terminal substrate to obtain various forms of AR display elements.
Referring to fig. 1, fig. 1 is a schematic view of a process for preparing a low adhesion holographic film according to the present invention.
Wherein, the sources of all raw materials are not specially limited and can be sold in the market; the types and thicknesses of the optical film layer and the protective layer are the same as those described above and are not described herein again.
Coating a photopolymer material on the optical film layer under the condition of keeping out of the sun, and curing at low temperature to form a film to obtain the optical film layer of the composite photopolymer film layer; in the present invention, the coating is preferably performed by a method of dimple coating and/or slit extrusion coating; the linear speed of the coating is preferably 10-60 m/min, more preferably 10-40 m/min, still more preferably 10-30 m/min, and most preferably 10-20 m/min; the thickness of the coating is preferably 10-80 μm, more preferably 20-80 μm, and further preferably 40-80 μm; the temperature of the low-temperature curing film forming is preferably 40-80 ℃, and more preferably 40 ℃; in the invention, the film is preferably cured at low temperature in a drying tunnel to form a film; the length of the drying channel is preferably 20-50 m, more preferably 30-40 m, and further preferably 35 m; and a plurality of sections of drying ovens are arranged in the drying tunnel, the temperature is gradually raised and the curing is carried out, and the whole process is carried out in a dark place.
Attaching a protective film to the surface of the photopolymer film layer of the optical film layer of the composite photopolymer film layer to obtain a holographic film; the preferred speed of the bonding is 20-60 m/min, and the more preferred speed is 20-40 m/min; preferably, rolling is carried out after the protective film is attached; the rolling is carried out through a rolling mechanism; the winding tension is preferably 6 × 10-18 × 10N, more preferably 8 × 10-15 × 10N, and still more preferably 10 × 10-12 × 10N; the tension of rolling is not too large, otherwise the holographic film is deformed.
Coating low-adhesion glue on the surface of the substrate, then attaching the holographic film, and attaching the surface of the optical film layer of the holographic film to the low-adhesion glue to obtain the holographic film of the composite substrate; in the present invention, this step is preferably embodied as follows: vacuum adsorbing a substrate on a flat plate coating machine, uniformly coating low-adhesion glue on the surface of the substrate by adopting a wire rod, micro-concave, slit coating and other modes, curing and curing after low-temperature baking to ensure that the low-adhesion glue is perfectly attached to the substrate, then attaching a holographic film, and attaching the surface of an optical film layer of the holographic film to the low-adhesion glue; when the low-adhesion-force glue is a non-UV (ultraviolet) glue reducing glue, the peeling force is less than 10gf/25 mm; the purpose of using low adhesion adhesive is to facilitate removal of the planar substrate in subsequent steps; the preferable laminating process specifically comprises the steps of adsorbing a glass or plastic planar substrate by using an upper suction plate of a flat laminating machine, adsorbing the holographic film by using a lower suction plate in vacuum, and laminating an optical film layer of the holographic film with the planar substrate.
Or coating low-adhesion glue on the surface of the optical film layer of the holographic film, and attaching the holographic film to the substrate to obtain the holographic film of the composite substrate; the steps are similar to the steps, the holographic film which is cut into a certain number is absorbed on a flat plate coating machine, the surface of the optical film layer of the holographic film is coated with low-adhesion glue, and other steps are the same.
Or performing corona treatment on the surface of the optical film layer of the holographic film, and attaching the optical film layer to the substrate to obtain the holographic film of the composite substrate; at this time, the surface of the optical film layer of the holographic film is attached to the substrate by electrostatic adsorption.
And after the holographic film of the composite substrate is subjected to holographic exposure, the low-adhesion holographic film with the display function is obtained. When the low-adhesion adhesive is a UV (ultraviolet) adhesive reducing adhesive, preferably performing irradiation treatment by using a UV light source after holographic exposure; the power of the UV light source is preferably 2000-4000 mW/cm2More preferably 2500-3500 mW/cm2More preferably 3000mW/cm2(ii) a The irradiation treatment time is preferably 1-5 min; the adhesive force of the UV adhesive is sharply reduced under the action of UV light; the low adhesion holographic film may be used to tear off the optical film, the holographically exposed photopolymer film and the protective film from the substrate.
To further illustrate the present invention, a low adhesion holographic film, a method for preparing the same, and its use in preparing an AR display element are described in detail below with reference to the examples.
The reagents used in the following examples are all commercially available; the photosensitive material glue solution used in the examples was prepared according to the preparation method of the photopolymer layer in the example of the chinese patent publication No. CN110603495 a.
Example 1
Step 1, coating of photosensitive material glue solution: and (3) coating the photosensitive material glue solution on a 60-mu mTAC film in a light-resistant environment by adopting a micro-concave coating mode, wherein the coating solution is automatically fed, the linear speed of a coating substrate is 20m/min, and the thickness of a wet film formed by the glue solution is controlled to be 40 mu m.
And 2, curing the photosensitive adhesive layer at a low temperature to form a film: and (3) enabling the film obtained by coating in the step (1) to pass through a drying tunnel which is long by 35 meters, setting the temperature of the drying tunnel to be 40-80 ℃, arranging a plurality of sections of drying ovens in the drying tunnel, and gradually heating and curing. The whole process is carried out in dark.
Step 3, laminating the protective film layer: and (3) bonding the film obtained in the step (2) and a 40 mu mTAC protective film by a bonding roller at a bonding speed of 20 m/min.
Step 4, rolling: and (4) rolling the holographic film obtained in the step (3) by using a rolling mechanism, and rolling the tension of 10 multiplied by 10N to obtain the holographic film coiled material.
And 5, coating a low-adhesion adhesive (Jiangxi Tayilai polymer material Co., Ltd., model: TB-900) on the planar glass substrate: the glass substrate is adsorbed on a flat plate coating machine in vacuum, and the low-adhesion adhesive is uniformly coated on the flat glass substrate in a wire rod coating mode, wherein the coating thickness is 40 mu m. Curing and curing for 12 hours after baking at 140 ℃ for 5min to ensure that the low-adhesion adhesive is perfectly attached to the plane glass substrate. The peeling force of the low-adhesion adhesive is less than 10gf/25 mm.
Step 6, attaching the holographic film to the plane glass substrate: cutting the holographic film into the size same as that of the glass substrate, adsorbing the glass substrate by an upper suction plate of a flat plate laminating machine, allowing the low-viscosity glue surface to face downwards, allowing a lower suction plate to adsorb the holographic film in vacuum, and laminating the holographic film and the plane substrate to obtain the low-viscosity-force holographic film material with the plane substrate.
And 7, after the holographic film with the plane substrate obtained in the step 6 is subjected to holographic exposure, obtaining the holographic film recorded with interference fringe information.
The holographic film obtained by the method can be torn off from the glass substrate, the low-adhesion adhesive layer is left on the plane glass substrate, the holographic film is attached to the automobile windshield by using optical adhesive to form the AR-HUD display element, and the formed AR-HUD display element helps a driver to display road conditions or other information in front of the windshield, so that the driving experience and safety are improved.
Example 2
Step 1, coating of photosensitive material glue solution: and (3) coating the photosensitive material glue solution on an 80-micron-diameter mMMA film in a light-resistant environment by adopting a micro-concave coating mode, wherein the coating solution is automatically fed, the linear speed of a coating substrate is 15m/min, and the thickness of a wet film formed by the glue solution is controlled to be 60 microns.
And 2, curing the photosensitive adhesive layer at a low temperature to form a film: and (2) enabling the film obtained by coating in the step (1) to pass through a drying tunnel which is long by 35 meters, setting the temperature of the drying tunnel to be 40-80 ℃, arranging a plurality of sections of drying ovens in the drying tunnel, and gradually heating and curing. The whole process is carried out in dark.
Step 3, laminating the protective film layer: and (3) bonding the film obtained in the step (2) and a 40 mu m PMMMA protective film through a bonding roller at the bonding speed of 20 m/min.
Step 4, rolling: and (4) rolling the holographic film obtained in the step (3) through a rolling mechanism, wherein the rolling tension is 10 multiplied by 10N, and thus obtaining the holographic film coiled material.
And 5, coating a low-adhesion adhesive (Jiangxi Tayilai polymer material Co., Ltd., type: TB-900) on the holographic film: and (3) adsorbing the photosensitive holographic film on a flat plate coating machine in vacuum, and uniformly coating the low-adhesion adhesive on the PMMA surface on one side of the holographic film by adopting a line bar coating mode, wherein the coating thickness is 20 micrometers. Curing and curing for 12 hours after baking at the low temperature of 100 ℃ for 5min to ensure that the low-adhesion adhesive is perfectly attached to the holographic film. The peeling force of the low-adhesion adhesive is less than 10gf/25 mm.
Step 6, the holographic film is attached to the plane: cutting the holographic film into the size same as that of the glass substrate, adsorbing the glass substrate by an upper suction plate of a flat plate laminating machine, adsorbing the holographic film in vacuum by a lower suction plate, enabling the low-adhesive-force surface to face upwards, and laminating the holographic film and the plane substrate to obtain the low-adhesive-force holographic film material with the plane substrate.
And 7, after the holographic film with the plane substrate obtained in the step 6 is subjected to holographic exposure, obtaining the holographic film with the recorded interference fringe information.
The holographic film obtained by the method of the embodiment can be torn off from the glass substrate, the low-adhesion adhesive layer is left on the PMMA surface on one side of the holographic film, so that the low-adhesion adhesive layer is arranged on one surface of the holographic film, the holographic film is directly attached to the dioptric lens to form the AR glasses diffraction optical waveguide display element, the AR glasses diffraction optical waveguide display element is applied to AR glasses, and the AR intelligent glasses with clear display and uniform brightness are obtained, wherein the graph shown in the attached figure 2 is a scene combining a real image and a virtual image displayed by the AR intelligent glasses prepared by the embodiment.
Example 3
Step 1, coating of photosensitive material glue solution: coating a photosensitive material glue solution on a film with the thickness of 40 mu mTAC in a slit coating mode in a dark environment, automatically feeding the coating solution, coating a substrate at the linear speed of 10m/min, and controlling the thickness of a wet film formed by the glue solution to be 80 mu m.
And 2, curing the photosensitive adhesive layer at a low temperature to form a film: and (3) enabling the film obtained by coating in the step (1) to pass through a drying tunnel which is long by 35 meters, setting the temperature of the drying tunnel to be 40-80 ℃, arranging a plurality of sections of drying ovens in the drying tunnel, and gradually heating and curing. The whole process is carried out in dark.
Step 3, laminating the protective film layer: and (3) attaching the film obtained in the step (2) and a TAC protective film of 40 micrometers by an attaching roller at the attaching speed of 20 m/min. The whole process is carried out in dark.
Step 4, rolling: and (4) rolling the holographic film obtained in the step (3) through a rolling mechanism, wherein the rolling tension is 10 multiplied by 10N, and thus obtaining the holographic film coiled material.
Step 5, coating UV (ultraviolet) viscosity-reducing glue on the glass substrate (New Material technology development Co., Ltd., model number: TS-108, available in Dongguan city): the UV viscosity reducing adhesive is a material with the adhesive force which is sharply reduced after UV light irradiation, and has a certain adhesive force when not irradiated by the UV light. And (3) adsorbing the glass substrate on a flat plate coating machine in vacuum, and uniformly coating the UV viscosity-reducing adhesive on the glass substrate by adopting a wire bar coating mode, wherein the coating thickness is 30 micrometers. Curing the glass substrate after baking at the low temperature of 90 ℃ for 5min, wherein the UV adhesive is well attached to the glass substrate.
Step 6, the holographic film is attached to the plane glass substrate: cutting the holographic film into the size same as that of the glass substrate, adsorbing the glass substrate by using an upper suction plate of a flat plate laminating machine, enabling the UV viscosity reducing glue surface to face downwards, adsorbing the holographic film in vacuum by using a lower suction plate, and laminating the holographic film and the plane substrate to obtain the UV viscosity reducing glue low-adhesion holographic film material with the plane substrate.
And 7, after the holographic film with the plane substrate obtained in the step 6 is subjected to holographic exposure, obtaining the holographic film with the recorded interference fringe information. At this time, 3000mW/cm was used2After the UV light source irradiates for 1min, the bonding force of the UV viscosity-reducing adhesive layer is sharply reduced under the action of UV light, the holographic film can be easily torn off from the glass substrate, and the UV viscosity-reducing adhesive layer is left on the glass substrate.
The holographic film that obtains through this embodiment separates with the glass substrate very easily, and it is inboard with optical cement with the laminating of holographic film to car windshield, forms AR-HUD display element, and the AR-HUD display element who forms helps navigating mate to show road conditions or other information in windshield's the place ahead, has promoted and has driven experience sense and security.
Claims (10)
1. Use of a low adhesion holographic film for the manufacture of an AR display element, the low adhesion holographic film comprising, stacked in sequence:
the film comprises a substrate, a low-adhesion layer, an optical film layer, a holographic exposed photopolymer film layer and a protective film layer.
2. The use of claim 1, wherein the low adhesion holographic film is used to make a non-planar AR display element.
3. Use according to claim 1, characterized in that the low adhesion layer has a peel force of less than 20gf/25 mm.
4. Use according to claim 1, wherein the low adhesion layer is an electrostatic adsorption layer, a low adhesion adhesive layer or a UV detackifying adhesive layer;
the protective film layer is selected from a TAC film, a PMMA film, a COP film, a PET film, a PE film or an OCA film.
5. The use according to claim 1, wherein the optical film layer has a thickness of 20 to 80 μm.
6. The use according to claim 1, wherein the holographically exposed photopolymer film layer has a thickness of 15 to 50 μm.
7. A method of making a low adhesion holographic film, comprising:
s1) coating the photopolymer material on the optical film layer under the condition of keeping out of the sun, and curing at low temperature to form a film to obtain the optical film layer of the composite photopolymer film layer;
s2) attaching a protective film to the surface of the photopolymer film layer of the optical film layer of the composite photopolymer film layer to obtain a holographic film;
s3) coating low-adhesion-force glue on the surface of the substrate, then attaching the holographic film, and attaching the surface of the optical film layer of the holographic film with the low-adhesion-force glue to obtain the holographic film of the composite substrate;
or coating low-adhesion glue on the surface of the optical film layer of the holographic film, and attaching the holographic film to the substrate to obtain the holographic film of the composite substrate;
or performing corona treatment on the surface of the optical film layer of the holographic film, and attaching the optical film layer to the substrate to obtain the holographic film of the composite substrate;
s4) carrying out holographic exposure on the holographic film of the composite substrate to obtain a low-adhesion holographic film with a display function;
s5) separating the holographic film obtained in step S4 from the substrate, and directly bonding the separated holographic film to the surface of the terminal substrate to obtain various forms of AR display elements.
8. The method according to claim 7, wherein the linear speed of the coating in step S1) is 10-60 m/min; the temperature for low-temperature curing film forming is 40-80 ℃.
9. The method according to claim 7, wherein the speed of applying the protective film in the step 2) is 20 to 60 m/min.
10. The preparation method of claim 7, wherein the step S2) of adhering a protective film further comprises rolling to obtain a holographic film; the tension of the winding is 6 multiplied by 10 to 18 multiplied by 10N.
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| CN202210422005.8A CN114721081A (en) | 2022-04-21 | 2022-04-21 | Low-adhesion holographic film, preparation method thereof and application of low-adhesion holographic film in preparation of AR (augmented reality) display element |
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| CN202210422005.8A CN114721081A (en) | 2022-04-21 | 2022-04-21 | Low-adhesion holographic film, preparation method thereof and application of low-adhesion holographic film in preparation of AR (augmented reality) display element |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115122688A (en) * | 2022-08-08 | 2022-09-30 | 杭州光粒科技有限公司 | Functional film, manufacturing method thereof and grating |
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| CN106094435A (en) * | 2016-06-03 | 2016-11-09 | 深圳市深大极光科技有限公司 | A kind of photopolymer thin film sensitive material that can be used for holographic recording and preparation method thereof |
| CN113829745A (en) * | 2021-10-15 | 2021-12-24 | 北京光谱印宝科技有限责任公司 | Transfer printing method and transfer printing system for holographic image |
| CN114055974A (en) * | 2021-11-17 | 2022-02-18 | 瞬彩视觉科技(上海)有限公司 | Photopolymer film and application thereof, photopolymer printing stock and preparation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106094435A (en) * | 2016-06-03 | 2016-11-09 | 深圳市深大极光科技有限公司 | A kind of photopolymer thin film sensitive material that can be used for holographic recording and preparation method thereof |
| CN113829745A (en) * | 2021-10-15 | 2021-12-24 | 北京光谱印宝科技有限责任公司 | Transfer printing method and transfer printing system for holographic image |
| CN114055974A (en) * | 2021-11-17 | 2022-02-18 | 瞬彩视觉科技(上海)有限公司 | Photopolymer film and application thereof, photopolymer printing stock and preparation method |
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