CN117518667A - Double stripping sheet and manufacturing method and application thereof - Google Patents
Double stripping sheet and manufacturing method and application thereof Download PDFInfo
- Publication number
- CN117518667A CN117518667A CN202210933249.2A CN202210933249A CN117518667A CN 117518667 A CN117518667 A CN 117518667A CN 202210933249 A CN202210933249 A CN 202210933249A CN 117518667 A CN117518667 A CN 117518667A
- Authority
- CN
- China
- Prior art keywords
- layer
- glue
- glue layer
- electro
- release film
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
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- JDSQBDGCMUXRBM-UHFFFAOYSA-N 2-[2-(2-butoxypropoxy)propoxy]propan-1-ol Chemical compound CCCCOC(C)COC(C)COC(C)CO JDSQBDGCMUXRBM-UHFFFAOYSA-N 0.000 description 8
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- JKNCOURZONDCGV-UHFFFAOYSA-N 2-(dimethylamino)ethyl 2-methylprop-2-enoate Chemical compound CN(C)CCOC(=O)C(C)=C JKNCOURZONDCGV-UHFFFAOYSA-N 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
- C09J11/02—Non-macromolecular additives
- C09J11/06—Non-macromolecular additives organic
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J123/00—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers
- C09J123/02—Adhesives based on homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Adhesives based on derivatives of such polymers not modified by chemical after-treatment
- C09J123/04—Homopolymers or copolymers of ethene
- C09J123/08—Copolymers of ethene
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J131/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by an acyloxy radical of a saturated carboxylic acid, of carbonic acid, or of a haloformic acid; Adhesives based on derivatives of such polymers
- C09J131/02—Homopolymers or copolymers of esters of monocarboxylic acids
- C09J131/04—Homopolymers or copolymers of vinyl acetate
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J163/00—Adhesives based on epoxy resins; Adhesives based on derivatives of epoxy resins
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J175/00—Adhesives based on polyureas or polyurethanes; Adhesives based on derivatives of such polymers
- C09J175/04—Polyurethanes
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/165—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on translational movement of particles in a fluid under the influence of an applied field
- G02F1/166—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect
- G02F1/167—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on translational movement of particles in a fluid under the influence of an applied field characterised by the electro-optical or magneto-optical effect by electrophoresis
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/165—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on translational movement of particles in a fluid under the influence of an applied field
- G02F1/1675—Constructional details
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/165—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on translational movement of particles in a fluid under the influence of an applied field
- G02F1/1675—Constructional details
- G02F1/16757—Microcapsules
Abstract
The embodiment of the application discloses a double stripping sheet which is used for forming a display assembly by combining with a functional layer with a transparent conductive layer. Compared with the electrophoresis display equipment in the prior art, the PET part is removed, the loss of light energy can be reduced, and the display effect is effectively improved. The double release sheet includes a first release film and a second release film, and an electro-optical material interposed between the first release film and the second release film; the electro-optic material includes: the first glue layer is formed by liquid first glue coated on the first release film; an electrophoretic medium layer; the second glue layer is formed by liquid second glue covering the inter-capsule section difference in the electrophoresis medium layer; the functional layer comprises at least one or any combination of a color filter layer, a light guide plate, a touch display layer and a protective layer.
Description
Technical Field
The present disclosure relates to the field of electro-optic components for electro-optic displays, and more particularly to a double release sheet and a method of making and using the same.
Background
Electro-optic material is a term used herein in the sense generally in the art to refer to the following materials: the material has at least first and second display states of different optical properties, the material changing from its first display state to its second display state when an electric field is applied to the material. The optical property is typically a color that is perceived by the human eye, but may be another optical property such as optical transmission, reflection, luminescence, or, in the case where it is desired for a machine-readable display, a pseudo color in the sense of being altered in the reflection of electromagnetic wavelengths outside the visible range.
Applicant published patent CN102253502a at 11/23 2011 discloses an electro-optical assembly comprising first and second substrates and a glue layer and an electro-optical material layer between the first and second substrates, the glue layer comprising a mixture of a polymeric binder material and an additive selected from the group consisting of salts, polyelectrolytes, polymer electrolytes, solid electrolytes and combinations thereof. Wherein one or both of the first and second substrates comprise an electrode. Recent authorities disclose CN100350323C, CN100357993C, CN100390819C, CN101082752B, CN101271239B, CN101738814B, CN103365018B, CN103424947B, CN103540162B, CN103834285B, CN103045151B, CN103091926B, CN103111208B, CN103173040B, CN104073210B, CN104073109B, CN105807531B, CN105845087B, CN105800363B, CN105097945B, CN105261652B, CN105023951B, CN105070736B, CN106520111B, CN106967379B, CN106883808, CN108059852B, CN108447406B, CN109535355B, CN110111746B, CN111048046B, US9,759,976B2, EP2477066B1, US9,318,059B2, EP2555181B1, JP5607231B2, US10,935,711B2, EP3121628B1 and US11124655B2.
For example, in several of the above-identified patent contexts, in which an encapsulated electrophoretic medium comprising capsules in a binder is coated onto a flexible substrate comprising Indium Tin Oxide (ITO) or a similar conductive paint (which is used as one electrode of the final display) is coated onto a plastic film, the capsules/binder paint is dried to form an adhesive layer where the electrophoretic medium adheres strongly to the substrate. The conductive layer is conveniently a thin metal layer of, for example, aluminum or indium tin oxide, or may be a conductive polymer. Polyethylene terephthalate (Polyethylene terephthalate, PET) films coated with aluminum or ITO are commercially available, for example, as "aluminizes" from e.i. du Pont DE neurours & Company, wilmington DE.
The applicant found that the above structure is commonly used in the industry, and that at least one substrate in the electro-optical assembly has the conductive layer, the conductive layer is ITO, and the substrate is PET, and the thickness thereof is generally between 0.01mm and 0.2 mm. The applicant believes that the display effect can be further improved by removing PET.
Disclosure of Invention
The invention provides an electro-optical material which is used for being combined with a functional layer with a transparent conductive layer to form a display assembly, and compared with the prior art, the electro-optical material removes a PET part, so that the loss of light energy can be reduced, and the display effect can be effectively improved.
The invention provides a double-stripping sheet, which comprises a first release film, a second release film and an electro-optical material arranged between the first release film and the second release film;
the electro-optic material includes:
the first glue layer is formed by liquid first glue coated on the first release film;
an electrophoretic medium layer formed of a liquid electrophoretic medium coated on the first glue layer, the electrophoretic medium comprising a plurality of capsules and a binder surrounding the capsules, the capsules comprising capsule walls, a suspending fluid coated in the capsule walls and a plurality of electrophoretic pigment particles suspended in the suspending fluid and movable by the fluid upon application of an electric field to the electrophoretic medium, the electrophoretic pigment particles comprising negatively charged electrophoretic pigment particles and electrically neutral electrophoretic pigment particles; the contact surface of the electrophoresis medium layer and the first glue layer is a flat surface, and the other surface of the electrophoresis medium layer presents a high-low uneven surface due to a plurality of capsule level differences;
the second glue layer is formed by liquid second glue covering the inter-capsule section difference in the electrophoresis medium layer;
The functional layer comprises at least one or any combination of a color filter layer, a light guide plate, a touch display layer and a protective layer.
Alternatively to this, the method may comprise,
the volume resistivity of the first glue layer is controlled to be 1-10 5 ～1*10 10 (Ω.cm)。
Alternatively to this, the method may comprise,
the thickness of the first glue layer is 0.1-10 mu m.
Alternatively to this, the method may comprise,
the thickness of the second glue layer is 0.1-50 mu m.
Alternatively to this, the method may comprise,
the thickness of the second glue layer is 5-35 mu m.
Alternatively to this, the method may comprise,
the volume resistivity of the second glue layer is controlled to be 1-10 7 ～1*10 12 (Ω.cm)。
Alternatively to this, the method may comprise,
the first glue and the second glue both comprise high molecular polymers, and the high molecular polymers comprise polyurethane polymers or copolymers of polyurethane and acrylic acid.
Alternatively to this, the method may comprise,
the molecular weight of the polymer in the second glue layer is distributed between 1 and 10 ten thousand.
Alternatively to this, the method may comprise,
the polymer in the second glue layer comprises ionic groups, namely carboxyl, sulfonic acid groups, amino groups and salt forming products thereof, wherein the mass ratio of the carboxylic acid groups is 0.1-10% of the sulfonic acid groups, and the mass ratio of the amino groups is 0.1-1.5%.
Alternatively to this, the method may comprise,
the molecular weight of the polymer in the first glue layer is distributed in 2-7 ten thousand.
Alternatively to this, the method may comprise,
the polymer in the first glue layer comprises an ionic group, and the ionic group of the polymer refers to carboxyl, sulfonic acid group, amino and salt-forming products thereof;
The polymer contains 0-10% of carboxylic acid groups, and 0-3% of sulfonic acid groups.
Alternatively to this, the method may comprise,
the release force between the first release film and the electro-optical material is (5-50) gf/inch; further 20-40;
the release force between the second release film and the electro-optical material is more than 2 times of the release force between the first release film and the electro-optical material.
Alternatively to this, the method may comprise,
the first release film is conductive or non-conductive.
Alternatively to this, the method may comprise,
the second release film is conductive or non-conductive.
The present invention also provides a method of manufacturing a double release sheet as described above, comprising:
coating liquid first glue on the first release film, and drying to form a first glue layer;
coating second glue on the second release film, and drying to form a second glue layer;
coating a liquid electrophoresis medium on the first glue layer, and drying to form an electrophoresis medium layer;
and laminating the electrophoresis medium layer with the second glue so that the second glue covers the inter-capsule level difference generated in the electrophoresis medium layer.
The present invention also provides a method of manufacturing a double release sheet as described above, comprising:
Coating liquid first glue on the first release film, and drying to form a first glue layer;
coating a liquid electrophoresis medium on the first glue layer, and drying to form a displayable electrophoresis medium layer;
and coating second glue on the electrophoresis medium layer, and drying to form a second glue layer, wherein the second glue layer covers the inter-capsule step difference generated in the electrophoresis medium layer.
The invention also provides an application of the double stripping sheet, which comprises the following steps:
peeling the first release film, combining the second glue layer with the functional layer containing the transparent conductive layer, and directly contacting the second glue layer with the transparent conductive layer;
stripping the second release film and combining the first glue layer with a driving bottom plate;
the first glue layer is in direct contact with the drive base plate.
Compared with the prior art, the invention has the following technical effects:
to facilitate mass production and storage, the prior art discloses an electro-optical assembly comprising a first and a second substrate and a glue layer and an electro-optical material layer between the first and the second substrate, the glue layer comprising a mixture of a polymeric binder material and an additive selected from the group consisting of salts, polyelectrolytes, polymer electrolytes, solid electrolytes and combinations thereof. Wherein one or both of the first and second substrates comprises an electrode and PET to which the electrode is attached. Referring to fig. 1 (original publication), the method for manufacturing the electro-optical device includes: (1) applying the electro-optic layer 130 to the substrate 110 with the conductive layer 120, (2) conveniently applying the laminating adhesive 180 to the release sheet 190 in liquid form by slot die coating, and drying (or otherwise curing) the adhesive to form a solid layer (3) laminating adhesive and release sheet to the electro-optic layer 130; this lamination can be conveniently performed using a heated roll lamination. (alternatively, but less desirably, the lamination adhesive can be applied over the electro-optical layer 130 and then dried or otherwise cured prior to being covered by the release sheet 190.) the release sheet 190 is conveniently a 7 mil (177 μm) film; depending on the nature of the electro-optic medium used, it may be desirable to coat the film with a release agent, such as silicone. As illustrated in fig. 1, release sheet 190 is peeled or otherwise removed from lamination adhesive 180 prior to lamination of FPL 100 to a base frame (not shown) to form a final display.
Fig. 2 shows an electronic paper display fabricated using the electro-optical assembly described above, including an electro-optical assembly portion and a functional layer and TFT driving backplane associated therewith. The bonding process is specifically as follows: the electro-optical component part comprises an electrophoretic medium layer 210, a substrate 220, the substrate 220 having a transparent conductive layer 221 in direct contact with the electrophoretic medium layer 210; also included are OCA layer 240 with the other side of substrate 220 and glue layer 230 with electrophoretic medium layer 210. The OCA layer 240 is combined with the functional layer 250, and the glue layer 230 is combined with the TFT driving backplane.
Based on the existing two electro-optical structures, the applicant believes that the above structure needs to be improved in the manufacturing process if PET is to be removed, and the following problems need to be further solved: it is known in the art to use PET coated with ITO as the transparent conductive layer so that the ITO is not separated from the PET. The electro-optical layer is required to be coated on the ITO, and thus it is common knowledge in the industry that ITO, PET, and electro-optical layers are not separable. If the technical prejudice cannot be envisaged, the removal of PET becomes an unrealizable technical solution. The applicant believes that to remove PET, ITO needs to be separated from PET, and that ITO is attached to functional layers such as color filters, light guide plates, waterproof protective layers, and touch screens that can be applied to displays. The electro-optical layer is then applied to the functional layer with the conductive layer, and the electro-optical component with a functional layer is then obtained in sequence according to the prior art operating steps for lamination with the TFT if required.
The electro-optical device having a certain functional layer obtained as described above is limited to be applied to only a certain function, and the electro-optical device is not very versatile in terms of practical use as a double release sheet of the prior art. The applicant believes that in order to better solve the technical problems in the background art, it is necessary to divide the process into two parts, firstly to obtain a subassembly of an electro-optical assembly which is convenient to store and does not contain PET, and then to apply the subassembly of the electro-optical assembly, to attach ITO to the functional layer, and then to laminate the electro-optical layer of the subassembly of the electro-optical assembly to the ITO. The above-described solution enables an electro-optical module to be obtained that does not contain PET. The subassembly of the electro-optic assembly includes: a first glue layer, an electrophoretic medium layer and a second glue layer.
The first glue layer is formed by liquid first glue coated on the first release film; the electrophoretic medium is formed as a liquid electrophoretic medium coated on the first glue layer, the electrophoretic medium comprising a plurality of capsules and a binder surrounding the capsules, the capsules comprising capsule walls, a suspending fluid encapsulated in the capsule walls and a plurality of electrophoretic pigment particles suspended in the suspending fluid and movable by the fluid upon application of an electric field to the electrophoretic medium, the electrophoretic pigment particles comprising negatively charged electrophoretic pigment particles and electrically neutral electrophoretic pigment particles; the second glue layer is formed by liquid second glue covering the gap between capsules in the electrophoresis medium layer.
Drawings
FIG. 1 is a schematic cross-sectional structural view of an electro-optic assembly of the prior art;
FIG. 2 is a schematic diagram of a cross-section of an electronic paper display in the prior art;
FIG. 3 is a schematic cross-sectional view of a dual release sheet embodiment of the present invention;
FIG. 4 depicts a display pattern of diffusion phenomena in an electrophoretic display;
FIG. 5 is a schematic diagram of an electro-optic assembly according to an embodiment of the present invention;
FIG. 6 depicts a schematic diagram of voltages in a glue layer of an electro-optic assembly;
FIG. 7 is an optically enlarged view of the display surface of the control group;
fig. 8 is an optically enlarged view of the display surface of the experimental group.
Detailed Description
For ease of mass production and ease of storage, the prior art discloses an electro-optical assembly comprising a first and a second substrate and a glue layer and an electro-optical material layer between the first and the second substrate, the glue layer comprising a mixture of a polymeric binder material and an additive selected from the group consisting of salts, polyelectrolytes, polymer electrolytes, solid electrolytes and combinations thereof. Wherein one or both of the first and second substrates comprises an electrode and PET to which the electrode is attached. The PET release film is also called as a PET silicone oil film, namely, a layer of silicone oil is coated on the surface of the PET film so as to reduce the adhesive force on the surface of the PET film and achieve the release effect. The method can be divided into a single-sided release film and a double-sided release film. The release force can be divided into a light release film, a medium release film and a heavy release film. The thicknesses commonly used are:
0.012mm,0.019mm,0.025mm,0.038mm,0.05mm,0.075mm,0.1mm,0.125mm,0.188mm。
Referring to fig. 1 (original publication), the method for manufacturing the electro-optical device includes: (1) applying the electro-optic layer 130 to the substrate 110 with the conductive layer 120, (2) conveniently applying the laminating adhesive 180 to the release sheet 190 in liquid form by slot die coating, and drying (or otherwise curing) the adhesive to form a solid layer (3) laminating adhesive and release sheet to the electro-optic layer 130; this lamination can be conveniently performed using a heated roll lamination. (alternatively, but less desirably, the lamination adhesive can be applied over the electro-optical layer 130 and then dried or otherwise cured prior to being covered by the release sheet 190.) the release sheet 190 is conveniently a 7 mil (177 μm) film; depending on the nature of the electro-optic medium used, it may be desirable to coat the film with a release agent, such as silicone. As illustrated in fig. 1, release sheet 190 is peeled or otherwise removed from lamination adhesive 180 prior to lamination of FPL 100 to a base frame (not shown) to form a final display.
The applicant believes that the above structure requires improved construction techniques to eliminate PET and to solve the following problems:
it is known in the art to use PET coated with ITO as the transparent conductive layer so that the ITO is not separated from the PET. And the electro-optical layer needs to be coated on the ITO. Therefore, it is common knowledge in the industry that ITO, PET, and electro-optical layers are not separable. If the technical prejudice cannot be envisaged, the removal of PET becomes an unrealizable technical solution. The applicant believes that to remove PET, ITO needs to be separated from PET, and that ITO is attached to functional layers such as color filters, light guide plates, waterproof protective layers, and touch screens that can be applied to displays. The electro-optical layer is then applied to the functional layer with the conductive layer, and the electro-optical component with a functional layer is then obtained in sequence according to the prior art operating steps for lamination with the TFT if required.
The electro-optical device having a certain functional layer obtained as described above is limited to be applied to only a certain function, and the electro-optical device is not very versatile in terms of practical use as a double release sheet of the prior art. The applicant believes that it is necessary to divide the process into two parts, one is to obtain a subassembly of an electro-optical assembly that is easy to store and does not contain PET, and when the subassembly of an electro-optical assembly is to be applied, the functional layer is first attached to ITO, and then the electro-optical layer of the subassembly of an electro-optical assembly is laminated to ITO. An electro-optical module free of PET can be obtained. The subassembly of the electro-optic assembly includes: a first glue layer, an electrophoretic medium layer and a second glue layer.
The first glue layer is formed by liquid first glue coated on a first release film, and the contact surface of the first glue layer and the release film is a flat surface; the electrophoretic medium layer is formed of a liquid electrophoretic medium coated on the first glue layer, the electrophoretic medium comprises a plurality of capsules and a binder surrounding the capsules, the capsules comprise capsule walls, a suspending fluid coated in the capsule walls and a plurality of electrophoretic pigment particles suspended in the suspending fluid and capable of moving through the fluid when an electric field is applied to the electrophoretic medium, and the electrophoretic pigment particles comprise negatively charged electrophoretic pigment particles and electrically neutral electrophoretic pigment particles; the second glue layer is formed by liquid second glue covering the gap between capsules in the electrophoresis medium layer.
Referring to fig. 2, an embodiment of an electro-optical material according to an aspect of the present invention includes: a first glue layer 1, an electrophoretic medium layer 2 and a second glue layer 3.
The electro-optical material according to any of the first aspects of the invention, the glue used comprising a polymeric binder material and an additive selected from the group consisting of: propylene glycol ether, diethylene glycol butyl ether, methoxymethanol, ethylene glycol, propylene glycol, glycerol, texanol, adipic acid, phthalic acid, lucolvan FBH, coasol, DBE-IB, DPnB, dowanol PPh, alcohol ester-12, hexylene glycol, commercial compositions thereof, and combinations thereof.
The electro-optic material according to any one of the first aspects of the invention, wherein the polymeric binder material is selected from: polyurethane, vinyl acetate-ethylene (vinyl acetate ethylene), epoxy, polyacrylic based adhesives, commercial compositions thereof (e.g., aqueous polyurethane emulsions), and combinations thereof. In one embodiment, the glue layer comprises polyurethane.
The electro-optical material according to any of the first aspects of the invention, wherein the additive comprises 0.5 to 20 wt%, preferably 1 to 20 wt%, preferably 2 to 15 wt%, preferably 2 to 10 wt%, for example about 1 wt%, about 2 wt%, about 3 wt%, about 4 wt%, about 5 wt%, about 7.5 wt%, about 10 wt%, about 15 wt%, about 20 wt% of the glue layer.
The electro-optic material according to any one of the first aspects of the invention, wherein the weight ratio of the polymeric binder material to additives in the glue layer is 100:1 to 60, preferably 100:2 to 50, preferably 100:2 to 40, preferably 100:2 to 25, preferably 100:2 to 20, preferably 100:2 to 15, preferably 100:2 to 10.
The electro-optic material according to any one of the first aspects of the invention, wherein the glue layer further comprises: salts, polyelectrolytes, polymer electrolytes, solid electrolytes, or combinations thereof. In one embodiment, the salt is selected from: potassium acetate, tetraalkylammonium salts, tetrabutylammonium chloride, tetrabutylammonium hexafluorophosphate. In one embodiment, the polyelectrolyte is selected from: alkali metal salts of polyacrylic acid, such as the sodium salt of PPA.
The electro-optic material is solid, meaning that the electro-optic material has a solid outer surface, although the material may (and typically is) have an internal liquid or gas filled space, and methods of assembling displays using such electro-optic materials. Such displays using solid electro-optic materials may be conveniently referred to hereinafter as "solid electro-optic displays". Thus, the term "solid electro-optic display" includes rotary bichromal member displays (see below), encapsulated electrophoretic displays, microporous electrophoretic displays, and encapsulated liquid crystal displays.
The terms "bistable" and "bistable" are used herein in their ordinary sense in the art to refer to displays comprising display elements having at least one first and second display state of different optical properties, and such that after any given element is driven to assume its first or second display state by an addressing pulse of finite duration, after termination of the addressing pulse, the state is continued at least several times, for example at least four times, the minimum duration of the addressing pulse being required to change the state of the display element. In published U.S. patent application No.2002/0180687 it is shown that some particle-based electrophoretic displays capable of achieving gray scale are stable not only in their extreme black-and-white state but also in their intermediate gray state, as are the case with some other types of electro-optic displays. This type of display is suitably referred to as "multi-stable" rather than bi-stable, although the term "bi-stable" may be used herein to cover both bi-stable and multi-stable displays for convenience.
Several types of electro-optic displays are known. One type of electro-optical display is described, for example, in U.S. patent No.5,808,783;5,777,782;5,760,761;6,054,071;6,055,091;6,097,531;6,128,124;6,137,467 and 6,147,791 (although this type of display is commonly referred to as a "rotary bichromatic ball" display, since in some of the patents mentioned above the rotary assembly is not spherical, the term "rotary bichromatic assembly" is preferred because it is more accurate). Such displays use a large number of small objects (typically spherical or cylindrical) having two or more sections with different optical properties and an internal dipole. These objects are suspended in liquid filled cavities in the matrix, which cavities are filled with liquid such that the objects are free to rotate. Changing the appearance of the display to apply an electric field thereto, thus rotating the object to various positions and changing the cross-section of the object as seen through the viewing surface. Electro-optic media of this type are typically bistable.
Many of the above-mentioned patents and applications recognize that the walls surrounding the discrete microcapsules in the encapsulated electrophoretic medium may be replaced by a continuous phase, thus creating a so-called "polymer dispersed electrophoretic display", wherein the electrophoretic medium comprises a plurality of discrete droplets of an electrophoretic fluid and a continuous phase of a polymeric material, in which the discrete droplets of the electrophoretic fluid in such a polymer dispersed electrophoretic display may be considered as capsules or microcapsules, although no discrete capsule film is associated with each individual droplet; see, for example, 2002/01331147, supra. Thus, for the purposes of this application, such polymer-dispersed electrophoretic media are considered to be a subset of encapsulated electrophoretic media.
Packaged electrophoretic displays are generally not subject to aggregation and sedimentation failure modes of conventional electrophoretic devices and offer further advantages, such as the ability to print or coat the display on a variety of flexible and rigid substrates. (use of the word "printing" is intended to include all printing and coating modes including, but not limited to, pre-metered coating such as sheet die coating, slot die or extrusion coating, slip or stack coating, curtain coating, roll coating such as knife roll coating, front-to-back roll coating, gravure coating, dip coating, spray coating, meniscus coating, dip coating, brush coating, air knife coating, screen printing processes, electrostatic printing processes, thermal printing processes, ink jet printing processes, and other similar techniques). Thus, the resulting display may be flexible. In addition, the display medium can be printed (using various methods), and the display itself can be manufactured inexpensively.
Although electrophoretic media are typically opaque (e.g., because in many electrophoretic media the particles substantially block the propagation of visible light through the display) and operate in a reflective mode, many electrophoretic displays may be operated in so-called "shutter modes," in which one display state is substantially opaque and one is transmissive. See, for example, U.S. Pat. Nos.6,130,774 and 6,172,798, and U.S. Pat. Nos.5,872,552, 6,144,361, 6,271,823, 6,225,971 and 6,184,856, supra. Dielectrophoresis displays, which are similar to electrophoretic displays but which rely on variations in the strength of the electric field, can operate in a similar mode; see U.S. patent No.4,418,346.
Another type of electro-optic display uses electrochromic media, for example in the form of a nano-color changing film comprising an electrode formed at least in part from a semiconducting metal oxide and a plurality of dye molecules connected to the electrode that are capable of reversible color change; see, e.g., O' Regan, b., et al, nature 1991, 353, 737; and Wood, d., information Display,18 (3), 24 (March 2002). See Bach, u, et al, adv. Nanochromic films of this type are also described, for example, in U.S. Pat. No.6,301,038, international patent publication No. WO 01/27690, and in U.S. patent application 2003/0214695. This type of medium is also typically bistable.
Another type of electro-optic display is a particle-based electrophoretic display, which has been the subject of intense research and development for many years, in which a plurality of charged particles are moved by a suspending fluid under the influence of an electric field. Electrophoretic displays can have the attributes of good brightness and contrast, wide viewing angle, state bistability, and low power consumption when compared to liquid crystal displays. However, the problem of long-term image quality of these displays has prevented their widespread use. For example, particles that make up electrophoretic displays tend to settle, resulting in an insufficient lifetime of these displays.
An embodiment of the electro-optic material will be described below in connection with a method of manufacturing the electro-optic material, the method comprising:
coating liquid first glue on a first release film 4, drying to form a first glue layer 1, and coating a liquid electrophoresis medium on the first glue layer; the coating pressure causes the capsules on the contact surface of the liquid electrophoresis medium and the first glue layer to be extruded to present a flat surface, and the capsules on the other surface of the electrophoresis medium are extruded by the deformation capsules to present a step difference of high and low landing.
In the process of coating the electrophoretic medium, the applicant has the advantage that the electrophoretic medium comprises capsules with different particle sizes and the particle size ranges from 5 mu m to 100 mu m, so that the capsules with smaller particle sizes are used for filling a large number of gaps between the capsules with larger particle sizes, and the reduction of the effective display area due to the gaps between the capsules is avoided. Applicant states in patent text published under 2019-01-25 that "for example, european patent EP1010036B1 and its japanese family patent JP4460149 provide an electrophoretic display comprising a display face (viewable surface) and a back face (reflective surface), between which there is a Polymer Matrix having cavities therein containing suspensions and particles, wherein the cavities have an aspect ratio of greater than 1.2. The technical problem to be solved by the patent is that under the condition of single-layer capsule coating, a large number of gaps exist between capsules, so that the actual effective display area is reduced. The document states that the cavity can be flattened by mechanical force or by shrinkage with an adhesive to be able to improve its optical display properties. Therefore, the capsules on the other side of the electrophoresis medium are extruded by the deformed capsules, the capsules with different sizes on the upper layer show a rough surface, and the capsules with different sizes form a step difference of 3-30 mu m.
And coating second glue on the second release film, and then laminating the electrophoresis medium and the second glue to enable the second glue to cover the inter-capsule level difference in the electrophoresis medium layer. In the above process, the lamination operation may be performed while the second glue is not yet dried, or a glue with a softer texture may be used as the second glue.
The above-mentioned electrophoretic medium comprises a plurality of capsules and a binder surrounding the capsules, the capsules comprise capsule walls, a suspending fluid enclosed in the capsule walls and a plurality of electrophoretic pigment particles suspended in the suspending fluid and movable by the fluid when an electric field is applied to the electrophoretic medium, the electrophoretic pigment particles comprising negatively charged electrophoretic pigment particles and electrically neutral electrophoretic pigment particles; the first glue and the second glue may be considered as glue of the same chemical structure and composition, and are also understood as glue of different chemical structures and compositions, including different glue compositions and different layer thicknesses of the formed glue. The application of glue will be described in detail later on in this embodiment.
The following examples of electro-optic materials of the present invention are further described:
in this embodiment, in order to better cover the inter-capsule level difference in the electrophoretic medium layer, the thickness of the second glue layer is preferably 5-35 μm. The scheme is obtained through experiments by the applicant, if the electro-optic display layer and the transparent conductive layer are directly laminated without eliminating the inter-capsule step difference, white spots are generated in the gap display between the transparent conductive layer and the electrophoretic medium, and the display effect is seriously affected.
The following examples of electro-optic materials of the present invention are further described:
referring to fig. 3-5, fig. 3 shows patterns of the electro-optical device in a normal display state, and the applicant found that edge shadows (as shown in fig. 4) occur when the electro-optical device is applied to a driving board with a thickness of 200dpi or more, which is mainly an edge diffusion phenomenon caused by the thickness and volume resistivity of the glue layer. Referring to fig. 5, the voltage on the driving bottom plate 6 is reduced from point a to point a' due to the influence of the resistance of the glue layer. For example, the voltage at point A is 15V to A 'down to 7V, and the voltage at point C is 15V, and the attenuation at point B' is 0V. The electrophoretic pigment particles of the electrophoretic medium layer 2 at the points A 'and B' influence the original motion trail due to voltage change, so that the final display effect is influenced to show the ghost. The above process can be understood in an abstract way that the glue layer is a resistor, and the resistance value affects the voltage, and further affects the display effect. Since the volume resistivity is proportional to the resistance, the smaller the volume resistivity, the smaller the voltage loss in an ideal state. However, the applicant found that when the volume resistivity is small to a certain value, the voltage loss increases instead, because the voltage from a to a' becomes 13V, but the voltage may become 7V due to the decrease in the volume resistivity. Therefore, the volume resistivity of the glue layer contacting the TFT6 is controlled to be 1×10 10 ～1*10 12 (Ω. cm).
Applicants have analyzed that the volume resistivity formula can be expressed as ρ=rs/L, where R is the resistance, S is the cross-sectional area, L is the glue layer thickness, ρ is the volume resistivity of the glue layer. The above formula can be simply modified to r=ρl/S, and in the case where ρ and S are constant, the smaller the glue layer thickness L, the smaller the resistance, and the smaller the influence on the voltage. Preferably, the thickness of the first glue layer is 1-10 μm, which is obtained by experiments of the applicant, and the thickness of more than 10 μm affects the voltage and the thickness of less than 1 μm affects the mechanical strength.
As described above, the applicant proposed "attaching ITO to functional layers such as color filter layers, light guide plates, waterproof protective layers, and touch display panels that can be applied to displays. The electro-optical layer is then applied to the functional layer with the conductive layer, and then the electro-optical component with a functional layer is obtained in sequence according to the prior art operating steps for lamination with the TFT if required. From the foregoing analysis, it can be appreciated that the electro-optical layer (i.e., the electrophoretic medium in this application) is applied to the transparent conductive layer, the capsules in contact with the transparent conductive layer are extruded to present a flat surface, and the capsules on the other side of the electrophoretic medium are extruded by the deformed capsules to present a step of height landing. In order to better cover the inter-capsule level difference in the electrophoretic medium layer, the thickness of the glue layer is preferably 5-35 μm. It will be appreciated that the thickness of the glue layer may affect the final display. Therefore, the thickness of the first glue layer can be controlled to be 1-10 μm only by adopting the technical scheme of the embodiment.
The following continues to describe the electro-optic material embodiments of the present application: the above has described that the second glue layer is used to coat the reverse side with a level difference, i.e. to meet the pressure sensitive properties of the glue. According to the method, the high-molecular polymer is synthesized autonomously, the molecular weight of the polymer is controlled, the content of ionic groups in a molecular structure is controlled, and part of ionic liquid or micromolecular polyol is added, so that the volume resistivity is reduced, and the pressure-sensitive characteristic is achieved. In this embodiment, the molecular weight of the polymer in the second glue layer is distributed in 1 to 5 ten thousand. It is understood that an excessive molecular weight will cause the glue layer to harden and not cover the level differences between the capsules.
The polymer in the first glue layer comprises ionic groups, namely carboxyl, sulfonic acid groups, amino groups and salt forming products thereof, wherein the mass ratio of the carboxylic acid groups is 0.1-1.5%, and the mass ratio of the sulfonic acid groups and the amino groups is 0.1-1.5%. The resistance of the glue coating can be adjusted within 1 x 107 to 1 x 1010 (omega. Cm).
The small molecular polyol is small molecular dihydric alcohol with molecular weight below 600 and liquid at normal temperature or oligomer thereof, usually propylene glycol, ethylene glycol and oligomer thereof, the addition ratio is 0.1-4%, the ratio can change the TG of the rubberizing water mixture, the volume resistivity of the rubberizing water is slowed down along with the change of temperature, and the excessive addition amount can influence the binding force.
The first glue specifically selects monomer materials of polyurethane and acrylic acid for polymerization, the mass percent of carboxylic acid groups of raw materials is 0.3%, the mass percent of sulfonic acid and amino groups of raw materials is 0.2%, the polymerization degree is controlled, the test weight average molecular weight Mw is 6.3 ten thousand, propylene glycol ether is added, the addition amount is 2% of solid, and the test volume resistivity is 7 x 10 11 (Ω. Cm) the first paste was applied to a thickness of 4 μm using a precision slit extrusion apparatus according to the structure shown to obtain a product satisfying edge spread and reliability.
The second glue specifically selects the raw materials required by polyurethane to polymerize, the mass percentage of carboxylic acid groups of the raw materials is 0.8%, the mass percentage of sulfonic acid and amino groups of the raw materials is 1.3%, the polymerization degree is controlled, the weight average molecular weight Mw is tested to be 3 ten thousand, meanwhile, glycerol is added, the addition amount is 3% of solid, the addition amount is 1% of solid, and the volume resistivity is tested to be 2 x 10 7 And (omega. Cm), the second glue is extruded by adopting a precise slit extrusion device according to the structure, the coating thickness is controlled to be 30 mu m, the bubbles of the electro-optic display layer are improved, and the good photoelectric requirement is ensured.
Table 1 shows the experimental parameters and display effects of this embodiment
The following continues to describe the electro-optic material embodiments of the present application:
the polymer in the first glue layer comprises ionic groups, the ionic groups of the polymer refer to carboxyl, sulfonic acid group, amine group and salt forming products thereof, and the volume resistivity is controlled to be 1 x 10 10 ～1*10 12 (omega. Cm) the polymer ionic group content, the mass ratio of carboxylic acid groups is 0% -0.4%, and the mass ratio of sulfonic acid groups and amine groups is 0% -0.3%.
The molecular weight of the polymer in the first glue layer is 2-7 ten thousand. Dividing intoToo low a molecular weight will lower the heat resistance of the lower glue, resulting in failure of the reliability test. Fig. 3 shows that the thickness of the first glue layer is controlled to be 1-5 um, and the volume resistivity is controlled to be 1 x 10 10 ～1*10 12 (Ω.cm) this example significantly improves the edge diffusion effect of the high definition module (300 dpi) when the final film is laminated to the TFT backplane by the lower glue layer.
In a second aspect the present invention provides a glue layer comprising a polymeric binder material and an additive selected from the group consisting of: propylene glycol ether, diethylene glycol butyl ether, methoxymethanol, ethylene glycol, propylene glycol, glycerol, texanol, adipic acid, phthalic acid, lucolvan FBH, coasol, DBE-IB, DPnB, dowanol PPh, alcohol ester-12, hexylene glycol, commercial compositions thereof, and combinations thereof.
The glue layer according to any of the second aspects of the invention, wherein the polymeric binder material is selected from the group consisting of: polyurethanes, vinyl acetate-ethylene, epoxy resins, polyacrylic acid based adhesives, commercial compositions thereof (e.g., aqueous polyurethane emulsions), and combinations thereof. In one embodiment, the glue layer comprises polyurethane.
The glue layer according to any of the second aspects of the invention, wherein the additive comprises 0.5 to 20 wt%, preferably 1 to 20 wt%, preferably 2 to 15 wt%, preferably 2 to 10 wt%, for example about 1 wt%, about 2 wt%, about 3 wt%, about 4 wt%, about 5 wt%, about 7.5 wt%, about 10 wt%, about 15 wt%, about 20 wt% of the glue layer.
The glue layer according to any of the second aspects of the invention, wherein the weight ratio of polymeric binder material to additive is 100:1-60, preferably 100:2-50, preferably 100:2-40, preferably 100:2-25, preferably 100:2-20, preferably 100:2-15, preferably 100:2-10.
The glue layer according to any of the second aspects of the invention, wherein the glue layer further comprises: salts, polyelectrolytes, polymer electrolytes, solid electrolytes, or combinations thereof. In one embodiment, the salt is selected from: potassium acetate, tetraalkylammonium salts, tetrabutylammonium chloride, tetrabutylammonium hexafluorophosphate. In one embodiment, the polyelectrolyte is selected from: alkali metal salts of polyacrylic acid, such as the sodium salt of PPA.
The glue layer according to any of the second aspects of the invention, wherein areas of the glue layer comprising additives having different colors are used as color filters.
The glue layer according to any of the second aspects of the invention, wherein the glue layer comprising additives further comprises an optical biasing element.
The second aspect of the present invention provides an adhesive comprising a polymeric adhesive material and an additive selected from the group consisting of conductive metal powders, ferrofluids, non-reactive solvents, conductive organic compounds, and combinations thereof.
In a second aspect, the invention provides the use of an additive to reduce the volume resistivity of a product and/or improve the electro-optical performance of a product, including but not limited to electro-optical components, double release sheets, electrophoretic media, adhesives, binders, electro-optical displays, electro-optical materials, electrophoretic displays, electro-optical media, electronic paper display screens, and the like, the additive selected from the group consisting of: propylene glycol ether, diethylene glycol butyl ether, methoxymethanol, ethylene glycol, propylene glycol, glycerol, texanol, adipic acid, phthalic acid, lucolvan FBH, coasol, DBE-IB, DPnB, dowanol PPh, alcohol ester-12, hexylene glycol, commercial compositions thereof, and combinations thereof.
The use according to the second aspect of the invention, wherein the additive is used in combination with a polymeric binder material selected from the group consisting of: polyurethanes, vinyl acetate-ethylene, epoxy resins, polyacrylic acid based adhesives, commercial compositions thereof (e.g., aqueous polyurethane emulsions), and combinations thereof. In one embodiment, the weight ratio of the polymeric binder material to the additive is 100:1 to 60, preferably 100:2 to 50, preferably 100:2 to 40, preferably 100:2 to 25, preferably 100:2 to 20, preferably 100:2 to 15, preferably 100:2 to 10.
In any aspect of the invention, features that are present between any two or more of the embodiments may be combined with each other as long as they do not contradict each other. Of course, appropriate modifications may be made to the corresponding features when combined with one another. Furthermore, features of any aspect of the invention are equally applicable to the same features as any other aspect, or the corresponding features may be modified as appropriate.
All documents cited herein are incorporated by reference in their entirety and are incorporated by reference herein to the extent they are not inconsistent with this invention. Furthermore, various terms and phrases used herein have a common meaning known to those skilled in the art, and even though they are still intended to be described and explained in greater detail herein, the terms and phrases used herein should not be construed to be inconsistent with the ordinary meaning in the sense of the present invention.
As used herein, the term "commercial composition" refers to a composition formulated for commercial use with the ingredients mentioned as the major ingredient (or one of the major ingredients). For example, products under the trade names NeoRez 9630 and NeoRez 9330 are two polyurethane dispersions available from NeoResins, inc.,730Main street,Wilmington MA 01887.
As used herein, the term "aqueous polyurethane emulsion" refers to an aqueous emulsion made from polyurethane as the major component.
As described herein, the term "release sheet" may also be referred to as "release sheet".
As described herein, the term "encapsulation" may also be referred to as "encapsulation".
As described herein, the term "base" may also be referred to as "floor".
In one embodiment, the glue layer may further comprise a polyelectrolyte. The polyelectrolyte may include, for example, salts of polyacids, such as, but not limited to, alkali metal salts of polyacrylic acid.
The glue layer comprising the additive may provide other functions than the adhesive function. For example, the glue layer may have areas of different colors and act as a color filter. Alternatively, the glue layer may comprise an optical biasing element.
In one embodiment, a salt may also be included in the binder for the electrophoretic medium. The salt may be, for example, an inorganic salt, an organic salt, or a combination thereof. In a particular embodiment, the salt comprises potassium acetate. In further embodiments, the salt may include a quaternary ammonium salt, for example a tetraalkylammonium salt, such as tetrabutylammonium chloride or tetrabutylammonium hexafluorophosphate.
In embodiments in which the additive in the binder is a polyelectrolyte, the polyelectrolyte may include salts of polyacids, such as alkali metal salts of polyacrylic acid.
The binder containing the additive may provide other functions than the adhesive function. For example, the adhesive may include an optical biasing component.
In still another aspect, an electrophoretic medium is provided comprising a plurality of capsules, each capsule comprising a capsule wall, a suspending fluid encapsulated in the capsule wall, and a plurality of charged particles suspended in the suspending fluid and capable of moving from the medium upon application of an electric field thereto, the medium further comprising a binder surrounding the capsules, the binder comprising a mixture of a polymeric binder material and an additive selected from the group consisting of conductive metal powders, ferrofluids, non-reactive solvents, conductive organic compounds, and combinations thereof.
In another aspect, an adhesive is provided that includes a mixture of a polymeric adhesive material and an additive selected from the group consisting of propylene glycol ether, diethylene glycol butyl ether, methoxymethanol, ethylene glycol, propylene glycol, glycerol, texanol, adipic acid, phthalic acid, lusolvan FBH, coasol, DBE-IB, DPnB, dowanol PPh, alcohol ester-12, hexylene glycol, commercial compositions thereof, and combinations thereof. In one embodiment, the additive may also be selected from: salts, polyelectrolytes, polymer electrolytes, solid electrolytes, and combinations thereof. In one embodiment, the adhesive may comprise a polyurethane, vinyl acetate-ethylene, epoxy, or polyacrylic based adhesive.
Finally, an adhesive is provided comprising a mixture of a polymeric adhesive material and an additive selected from the group consisting of conductive metal powders, ferrofluids, non-reactive solvents, conductive organic compounds, and combinations thereof. In this adhesive, the polymeric adhesive material may be selected from the group consisting of polyurethane, vinyl acetate-ethylene, epoxy, polyacrylic based adhesives, and combinations thereof.
As already described, certain additives are disclosed herein for use in glue layers of electro-optic assemblies and displays, as well as in adhesives for capsules surrounding encapsulated electrophoretic media, to control the volume resistivity of the adhesive material. The glue layers and binders disclosed herein are capable of changing the volume resistivity without substantially changing the mechanical properties of the glue layer or binder. By adding one or more additives, the glue layer and the binder expand the choice of adhesive materials that have the desired mechanical properties but cannot be used additionally because their volume resistivity is not suitable. Thus, one can "fine tune" the volume resistivity of the glue layer or binder, i.e. adjust the volume resistivity of the material to an optimal value for a particular display or electrophoretic medium.
In one embodiment, a salt may also be included in the binder for the electrophoretic medium. The salt may be, for example, an inorganic salt, an organic salt, or a combination thereof. In a particular embodiment, the salt comprises potassium acetate. In further embodiments, the salt may include a quaternary ammonium salt, for example a tetraalkylammonium salt, such as tetrabutylammonium chloride or tetrabutylammonium hexafluorophosphate.
In embodiments in which the additive in the binder is a polyelectrolyte, the polyelectrolyte may include salts of polyacids, such as alkali metal salts of polyacrylic acid.
The binder containing the additive may provide other functions than the adhesive function. For example, the adhesive may include an optical biasing component.
In still another aspect, an electrophoretic medium is provided comprising a plurality of capsules, each capsule comprising a capsule wall, a suspending fluid encapsulated in the capsule wall, and a plurality of charged particles suspended in the suspending fluid and capable of moving from the medium upon application of an electric field thereto, the medium further comprising a binder surrounding the capsules, the binder comprising a mixture of a polymeric binder material and an additive selected from the group consisting of conductive metal powders, ferrofluids, non-reactive solvents, conductive organic compounds, and combinations thereof.
In another aspect, an adhesive is provided that includes a mixture of a polymeric adhesive material and an additive selected from the group consisting of propylene glycol ether, diethylene glycol butyl ether, methoxymethanol, ethylene glycol, propylene glycol, glycerol, texanol, adipic acid, phthalic acid, lusolvan FBH, coasol, DBE-IB, DPnB, dowanol PPh, alcohol ester-12, hexylene glycol, commercial compositions thereof, and combinations thereof. In one embodiment, the additive may also be selected from: salts, polyelectrolytes, polymer electrolytes, solid electrolytes, and combinations thereof. In one embodiment, the adhesive may comprise a polyurethane, vinyl acetate-ethylene, epoxy, or polyacrylic based adhesive.
Finally, an adhesive is provided comprising a mixture of a polymeric adhesive material and an additive selected from the group consisting of conductive metal powders, ferrofluids, non-reactive solvents, conductive organic compounds, and combinations thereof. In this adhesive, the polymeric adhesive material may be selected from the group consisting of polyurethane, vinyl acetate-ethylene, epoxy, polyacrylic based adhesives, and combinations thereof.
As already described, certain additives are disclosed herein for use in glue layers of electro-optic assemblies and displays, as well as in adhesives for capsules surrounding encapsulated electrophoretic media, to control the volume resistivity of the adhesive material. The glue layers and binders disclosed herein are capable of changing the volume resistivity without substantially changing the mechanical properties of the glue layer or binder. By adding one or more additives, the glue layer and the binder expand the choice of adhesive materials that have the desired mechanical properties but cannot be used additionally because their volume resistivity is not suitable. Thus, one can "fine tune" the volume resistivity of the glue layer or binder, i.e. adjust the volume resistivity of the material to an optimal value for a particular display or electrophoretic medium.
The glue layer or binder comprises one or more additives selected from the group consisting of: (a) Propylene glycol ether, diethylene glycol butyl ether, methoxymethanol, ethylene glycol, propylene glycol, glycerol, texanol, adipic acid, phthalic acid, lucolvan FBH, coasol, DBE-IB, DPnB, dowanol PPh, alcohol ester-12, hexylene glycol, commercial compositions thereof, and combinations thereof; (b) Salts, polyelectrolytes, polymer electrolytes, solid electrolytes, and combinations thereof; or (c) a conductive metal powder, a ferrofluid, a non-reactive solvent, a conductive organic compound, and combinations thereof.
In certain embodiments, the additive may be a salt such as an inorganic salt, an organic salt, or a combination thereof. Exemplary salts include potassium acetate and tetraalkylammonium salts, particularly tetrabutylammonium salts such as chlorides. Further examples of salts include lithium salts such as LiCF3SOF3, liClO4, liPF6, liBF4, liAsF6 and LiN (CF 3SO 2) 3. The presently preferred salt is tetrabutylammonium hexafluorophosphate, primarily due to the stability and inertness of the salt.
In other embodiments, the polymer electrolyte is a polyelectrolyte. Polyelectrolytes are typically polymers in which about 10% or more of the molecules consist of functional groups capable of ionization to form charged moieties. Examples of certain functional groups in the polyelectrolyte include, but are not limited to, carboxylic acids, sulfonic acids, phosphoric acids, and quaternary ammonium compounds. These polymers may be used in combination with organic or inorganic salts or alone. Examples of polyelectrolytes include, but are not limited to, polyacrylic acid, polystyrene sulfonate, poly (2-vinylpyridine), poly (4-vinylpyridine), poly (dimethylammonium chloride), poly (dimethylaminoethyl methacrylate), poly (diethylaminoethyl methacrylate). The preferred polyelectrolyte is the sodium salt of polyacrylic acid (PAA).
In a further embodiment of the invention, the additive is a polymer electrolyte. The term "polymer electrolyte" as used herein describes a polymer capable of solubilising salts. The solubility of salts in these polymers may be enhanced by the presence of oxygen and/or nitrogen atoms in the polymer which form ethers, carbonyl groups, carboxylic acids, primary, secondary, tertiary and quaternary amino groups, sulfonic acids, and the like. Examples of the polymer electrolyte include polyether compounds such as polyethylene oxide, polypropylene oxide, polytetramethylene oxide, polyamines such as polyethylene imine, polyvinyl pyrrolidone, polymers containing quaternary ammonium groups such as n+r1r2r3r4, wherein R1, R2, R3 and R4 are each independently H or a linear, branched, or cyclic alkyl group containing 1 to 25 carbon atoms, and wherein the counter ion may be selected from any organic or inorganic anions.
In the present invention, for example, the following additives: propylene glycol ether, diethylene glycol butyl ether, methoxymethanol, ethylene glycol, propylene glycol, glycerol, texanol, adipic acid, phthalic acid, lucolvan FBH, coasol, DBE-IB, DPnB, dowanol PPh, alcohol ester-12, hexylene glycol, commercial compositions thereof, and combinations thereof, all having substantially common properties by having an effect to assist in film formation, i.e., being a film formation aid.
Still other additives may include conductive metal powders, ferrofluids, and/or non-reactive solvents that may improve or hinder ion mobility in solution. Examples of suitable non-reactive solvents include water, diethyl ether, dipropyl ether, diethylene glycol, glyme, diglyme, N-methylpyrrolidone, and the like. In yet another embodiment, a conductive organic compound may be used as an additive. Some non-limiting examples of these compounds include polyaniline, polythiophene, polypyrrole, poly-3, 4-dioxyethylenethiophene, and derivatives of these materials in their n-or p-doped states.
The polymeric binder material for the glue layer or binder may be any polymeric material that meets the end use application. Examples of suitable polymeric binder materials include polyurethane, vinyl acetate-ethylene, epoxy resins, polyacrylic based binders, or combinations thereof. These adhesive materials may be solvent-based or water-based. Examples of specific polyurethanes that may be used are described in pending U.S. application Ser. No.10/715,916, filed 11/18/2003 and assigned to Air Products andChemicals, inc.
The additives incorporated into the polymeric binder material may be formed in situ; in other words, one or more precursor materials may be incorporated into the polymeric binder material or binder, wherein the precursor materials may react with each other or with the polymeric binder or binder, or the binder material or binder may be exposed to conditions (e.g., exposure to heat, light, or a magnetic or electric field) that cause a change in the precursor material to form the final additive.
The binder material or binder may contain components (or other dopants) other than additives for adjusting its volume resistivity; for example, the adhesive material or binder may also contain dyes or other colorants. It is known to form full colour electro-optical displays by providing colour filters in a single layer on the viewing surface of the display (the surface through which an observer views the display), such colour filters comprising pixels of different colours (e.g. red, green and blue). However, when the color filter is separated from the electro-optical material in this way, there is a possibility of image distortion when the color image is observed at an angle substantially perpendicular to the observation surface. To avoid such problems, it is in principle necessary to place the color filters immediately adjacent to the electro-optical material itself. However, this requires placing color filters between the electrodes of the display such that the electrical properties of the color filters affect the performance of the display. This is a particular problem with color filters because such filters are typically formed by dyeing a polymeric base material with three different dyes or dye mixtures to form red, green and blue or other color portions; and it is unlikely that three different dyes will affect the electrical properties of the color filter in the same way. The glue layer and binder described herein can be used to counteract the effects of different dyes and to substantially homogenize the electrical properties of the color filter, thereby avoiding artifacts appearing on the image due to non-uniform electrical properties in the color filter.
It is also known (see 2003/0011560) that an "optical biasing assembly" can be provided in an adhesive or laminating adhesive that encapsulates the electrophoretic display to adjust the appearance of the display. Providing such an optical bias component can affect the electrical properties of the adhesive or binder, and the electrical properties of the adhesive or binder comprising such an optical bias component can be optimized by using the additives described herein.
The optimum amount of additive will vary widely depending on the exact polymeric binder or adhesive material, the exact additive used, and the desired volume resistivity of the final mixture. However, it can generally be stated that the amounts of additives as described herein above can be found to be useful. As shown in the examples below, the volume resistivity of the adhesive material generally varies in a predictable manner with the concentration of the additive, and thus the final choice of how much additive should be added to achieve the desired volume resistivity can be readily determined empirically.
In general, no special process is required to introduce the additives into the adhesive material. If, as is typically the case, the glue layer is formed by: a film of a latex or solution of the adhesive material is applied to a substrate, or to an electro-optic material, and then dried to form a layer of glue, typically by simply dissolving or dispersing the additive in the latex or solution of the adhesive material prior to application. The additives may be added neat to the latex or solution, or may be dissolved in an aqueous solution, a non-aqueous solution, or a combination thereof. Similarly, as in the typical case, the electrophoretic medium is formed by: mixing a slurry of capsules in a liquid with a latex or solution of a polymeric binder, coating the resulting mixture onto a substrate, and drying to form an electrophoretic medium; the additives are typically simply dissolved or dispersed in the latex or solution of the polymeric binder prior to mixing such latex or solution with the capsules. It is of course necessary to ensure a uniform dispersion of the additive throughout the adhesive material to prevent a change in the electrical conductivity of the final adhesive or binder layer, but the person skilled in the art of coating is familiar with conventional techniques such as lengthy stirring on a roll kneader to ensure such uniform dispersion.
The choice of the particular additive used is governed primarily by considerations of compatibility with the other components of the glue layer and solubility in the adhesive material into which the additive is to be incorporated. If additives are to be added to the aqueous latex of the binder material, as is typically the case, the additives should be selected to have good water solubility so that alkali metal and substituted ammonium salts are generally preferred in the salt. Care should be taken to ensure that the additives do not cause aggregation of the latex particles. Also, the additive should desirably not cause a large change in the pH of the adhesive material and should not chemically react with the adhesive material or other parts of the final display (e.g., the chassis) that it ultimately contacts.
The addition of one or more additives can greatly expand the range of polymeric materials that can be used as binders and laminating adhesives in electro-optic displays. In particular, the addition of one or more additives enables the use of polymeric materials which have very desirable mechanical properties in electro-optical displays, but which have a volume resistivity in their pure state which is too high to be used. Also, since some electro-optic displays, particularly encapsulated electrophoretic and electrochromic displays, are sensitive to moisture, the addition of one or more additives can be used to replace the water-based polyurethane dispersions heretofore used with non-hygroscopic and/or hydrophobic polymeric materials for such displays.
It should be understood that the modified adhesives and binders disclosed herein may be used in applications other than electro-optic displays.
A third aspect of the invention provides a method of manufacturing an electro-optic material as described above, comprising in particular:
coating liquid first glue on the first release film 4, and drying to form a first glue layer 1;
coating a liquid electrophoresis medium 2 on the first glue layer 1;
coating second glue on the second release film 5;
and laminating the electrophoresis medium 2 with the second glue so that the second glue covers the inter-capsule level difference in the electrophoresis medium layer.
In this embodiment, the thickness of the first glue layer is controlled to be 1-10 μm, and the volume resistivity of the first glue layer is controlled to be 1×10 10 ～1*10 12 (Ω. Cm). And controlling the thickness of the second glue layer to be 5-35 mu m. The second glue layerIs controlled to be 1 x 10 7 ～1*10 10 (Ω. Cm). The reason and the control method for controlling the first glue layer and the second glue layer are described in the foregoing embodiments, and are not described herein.
On an actual coating line, the above embodiment can be understood as performing the following operations:
s1, coating liquid first glue on a first release film, and drying to form a first glue layer;
S2, laminating a protective film on the surface of the first glue layer;
s3, winding the first glue layer with the protective film;
s4, coating second glue on the second release film, and drying to form a second glue layer;
s5, laminating a protective film on the surface of the second glue layer;
s6, rolling the second glue layer with the protective film;
s7, stripping the protective film on the first glue layer;
s8, coating a liquid electrophoresis medium on the first glue layer;
s9, stripping the protective film on the second glue layer;
and S10, laminating the electrophoresis medium with the second glue.
The double stripping sheet provided in the fourth aspect of the application can be obtained through the steps, and the double stripping sheet sequentially comprises:
the electrophoresis medium comprises a first release film 4, a first glue layer 1, an electrophoresis medium layer 2, a second glue layer 3 and a second release film 5. In order to meet the process requirements, the release force between the first release film and the electro-optical material is (75-110) gf/inch; the release force between the second release film and the electro-optical material is more than 2 times of the release force between the first release film and the electro-optical material.
In this embodiment, the first release film may or may not have conductivity. The second release film is conductive or non-conductive. In general, the above manufacturing process can be achieved by applying a non-conductive ionization type film. Since the double release sheet needs to be tested in this process, the test can be directly performed using a release film having conductivity.
A fifth aspect of the present invention provides a method of electro-optical assembly using the above-described double lift-off fabrication, comprising:
attaching a transparent conductive layer to the functional layer;
peeling the first release film and laminating the second glue layer and the transparent conductive layer;
and stripping the second release film, and laminating the first glue layer with a driving bottom plate.
In a sixth aspect, the present invention provides an electro-optical module manufactured by using the above-mentioned method for manufacturing an electro-optical module, comprising, in order: the device comprises a functional layer, a transparent conductive layer, a first glue layer, an electrophoresis medium layer, a second glue layer and a driving bottom plate.
The invention will be further described by the following specific examples. However, the scope of the present invention is not limited to the following examples. Those skilled in the art will appreciate that various changes and modifications can be made to the invention without departing from the spirit and scope thereof. The present invention generally and/or specifically describes the materials used in the test as well as the test methods. Although many materials and methods of operation are known in the art for accomplishing the objectives of the present invention, the present invention will be described in as much detail herein.
While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various modifications and variations can be made in the present application without departing from the spirit or scope of the application. Thus, if such modifications and variations of the present application fall within the scope of the claims and the equivalents thereof, the present application is intended to cover such modifications and variations.
Claims (17)
1. A double release sheet comprising a first release film and a second release film, and an electro-optic material disposed between the first release film and the second release film;
the electro-optic material includes:
the first glue layer is formed by liquid first glue coated on the first release film;
an electrophoretic medium layer formed of a liquid electrophoretic medium coated on the first glue layer, the electrophoretic medium comprising a plurality of capsules and a binder surrounding the capsules, the capsules comprising capsule walls, a suspending fluid coated in the capsule walls and a plurality of electrophoretic pigment particles suspended in the suspending fluid and movable by the fluid upon application of an electric field to the electrophoretic medium, the electrophoretic pigment particles comprising negatively charged electrophoretic pigment particles and electrically neutral electrophoretic pigment particles; the contact surface of the electrophoresis medium layer and the first glue layer is a flat surface, and the other surface of the electrophoresis medium layer presents a high-low uneven surface due to a plurality of capsule level differences;
The second glue layer is formed by liquid second glue covering the inter-capsule section difference in the electrophoresis medium layer;
the functional layer comprises at least one or any combination of a color filter layer, a light guide plate, a touch display layer and a protective layer.
2. The double release sheet according to claim 1, wherein:
the volume resistivity of the first glue layer is controlled to be 1-10 5 ～1*10 10 (Ω.cm)。
3. The double release sheet according to claim 1, wherein:
the thickness of the first glue layer is 0.1-10 mu m.
4. The double release sheet according to claim 1, wherein:
the thickness of the second glue layer is 0.1-50 mu m.
5. The double release sheet according to claim 1, wherein:
the thickness of the second glue layer is 5-35 mu m.
6. The double release sheet according to claim 1, wherein:
the volume resistivity of the second glue layer is controlled to be 1-10 7 ～1*10 12 (Ω.cm)。
7. The double release sheet according to claim 1, wherein:
the first glue and the second glue both comprise high molecular polymers, and the high molecular polymers comprise polyurethane polymers or copolymers of polyurethane and acrylic acid.
8. The double release sheet according to claim 7, wherein:
The molecular weight of the polymer in the second glue layer is distributed between 1 and 10 ten thousand.
9. The double release sheet according to claim 7, wherein:
the polymer in the second glue layer comprises ionic groups, namely carboxyl, sulfonic acid groups, amino groups and salt forming products thereof, wherein the mass ratio of the carboxylic acid groups is 0.1-10% of the sulfonic acid groups, and the mass ratio of the amino groups is 0.1-1.5%.
10. The double release sheet according to claim 7, wherein:
the molecular weight of the polymer in the first glue layer is distributed in 2-7 ten thousand.
11. The double release sheet according to claim 7, wherein:
the polymer in the first glue layer comprises an ionic group, and the ionic group of the polymer refers to carboxyl, sulfonic acid group, amino and salt-forming products thereof;
the polymer contains 0-10% of carboxylic acid groups, and 0-3% of sulfonic acid groups.
12. The double release sheet according to any one of claims 1 to 11, wherein:
the release force between the first release film and the electro-optical material is (5-50) gf/inch; further 20-40;
the release force between the second release film and the electro-optical material is more than 2 times of the release force between the first release film and the electro-optical material.
13. The double release sheet according to claims 1-11, characterized in that:
the first release film is conductive or non-conductive.
14. The double release sheet according to claims 1-11, characterized in that:
the second release film is conductive or non-conductive.
15. A method of making the double release sheet according to any one of claims 1-14, comprising:
coating liquid first glue on the first release film, and drying to form a first glue layer;
coating second glue on the second release film, and drying to form a second glue layer;
coating a liquid electrophoresis medium on the first glue layer, and drying to form an electrophoresis medium layer;
and laminating the electrophoresis medium layer with the second glue so that the second glue covers the inter-capsule level difference generated in the electrophoresis medium layer.
16. A method of making the double release sheet according to any one of claims 1-14, comprising:
coating liquid first glue on the first release film, and drying to form a first glue layer;
coating a liquid electrophoresis medium on the first glue layer, and drying to form a displayable electrophoresis medium layer;
And coating second glue on the electrophoresis medium layer, and drying to form a second glue layer, wherein the second glue layer covers the inter-capsule step difference generated in the electrophoresis medium layer.
17. Use of a double release sheet according to any one of claims 1-14, comprising:
peeling the first release film, combining the second glue layer with the functional layer containing the transparent conductive layer, and directly contacting the second glue layer with the transparent conductive layer;
stripping the second release film and combining the first glue layer with a driving bottom plate;
the first glue layer is in direct contact with the drive base plate.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210933249.2A CN117518667A (en) | 2022-08-04 | 2022-08-04 | Double stripping sheet and manufacturing method and application thereof |
| PCT/CN2022/114830 WO2024026949A1 (en) | 2022-08-04 | 2022-08-25 | Double release sheet and manufacturing method therefor and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210933249.2A CN117518667A (en) | 2022-08-04 | 2022-08-04 | Double stripping sheet and manufacturing method and application thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117518667A true CN117518667A (en) | 2024-02-06 |
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ID=89750071
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210933249.2A Pending CN117518667A (en) | 2022-08-04 | 2022-08-04 | Double stripping sheet and manufacturing method and application thereof |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN117518667A (en) |
| WO (1) | WO2024026949A1 (en) |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AU2002354672A1 (en) * | 2001-07-09 | 2003-01-29 | E Ink Corporation | Electro-optical display having a lamination adhesive layer |
| US7110164B2 (en) * | 2002-06-10 | 2006-09-19 | E Ink Corporation | Electro-optic displays, and processes for the production thereof |
| US7839564B2 (en) * | 2002-09-03 | 2010-11-23 | E Ink Corporation | Components and methods for use in electro-optic displays |
| CN100397227C (en) * | 2002-09-03 | 2008-06-25 | 伊英克公司 | Electro-optic displays |
| WO2004088395A2 (en) * | 2003-03-27 | 2004-10-14 | E Ink Corporation | Electro-optic assemblies |
| WO2005041160A2 (en) * | 2003-10-24 | 2005-05-06 | E Ink Corporation | Electro-optic displays |
| US20090122389A1 (en) * | 2007-11-14 | 2009-05-14 | E Ink Corporation | Electro-optic assemblies, and adhesives and binders for use therein |
| JP2012063443A (en) * | 2010-09-14 | 2012-03-29 | Toppan Printing Co Ltd | Method for manufacturing information display, scatter reflection type display body for information display, and information display |
| CN102585676B (en) * | 2011-01-05 | 2014-02-26 | 广州奥熠电子科技有限公司 | Electrophoretic display coating liquid and preparation method thereof |
| CN102253502A (en) * | 2011-04-18 | 2011-11-23 | 广州奥翼电子科技有限公司 | Bonding agent and electro-optic assembly and electrophoretic medium thereof |
| EP4022389A4 (en) * | 2019-08-26 | 2023-08-16 | E Ink Corporation | Electro-optic device comprising an identification marker |
-
2022
- 2022-08-04 CN CN202210933249.2A patent/CN117518667A/en active Pending
- 2022-08-25 WO PCT/CN2022/114830 patent/WO2024026949A1/en unknown
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| WO2024026949A1 (en) | 2024-02-08 |
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