CN116136637A - Sealing structure for flexible spliced electrophoretic display - Google Patents

Abstract

The invention discloses a sealing structure for a flexible spliced electrophoretic display, which comprises the following components: at least two limiting bodies adhered to the bottoms of the FPCs, wherein the two limiting bodies are respectively arranged on two sides of the boundary line of the two FPCs; the longitudinal continuous part of the limiting body is not shorter than the length of the boundary line of the two FPCs; a water vapor isolation material is filled between the two limit bodies; the water vapor isolation material is tightly connected with the two FPCs and the two limiting bodies. The problem of vapor intrusion can be effectively solved, and the service life of the display is further prolonged.

Description

Sealing structure for flexible spliced electrophoretic display

Technical Field

The invention relates to the technical field of electrophoretic display, in particular to a sealing structure for a flexible spliced electrophoretic display.

Background

The electronic paper is a novel display material, is a bistable display technology based on an electrophoresis principle, has wide application range, and has the advantages of ultralow energy consumption, thin paper, bending, book-like definition and the like. The electronic paper electrophoretic display is limited by the technology and the chip performance, so that the large-size electronic paper display screen has low yield and extremely high cost, and the application and development of electronic paper display are greatly restricted, so that the spliced display screen is generated.

Patent application (CN 202010685615.8) filed by applicant in 7 of 2020 claims a tiled electrophoretic display and a method for manufacturing the same. In the specification, a sealing structure is disclosed, referring to fig. 1, an upper protective layer 5 is integrally formed and covers the upper surface of a display layer 7, a lower protective layer comprises a splicing protective block 22b and a sealing edge block 22a, the splicing protective block 22b covers a lower splicing area, and the sealing edge block 22a is connected with the lower end of sealing edge glue. The edge sealing glue block 22a is fixed with the display layer 7 through the sealing glue 22c, and is sealed. To prevent moisture from entering from the edges of the protective block 22b, the edges of the protective block 22b are sealed with a sealant and edge sealing block. The above structure theoretically prevents water vapor from entering the junction of two adjacent driving bottom plates, but in use, the applicant finds that only the edge sealing block and the edge sealing adhesive which is connected with the driving bottom plates can prevent the water vapor from entering, the effective distance for blocking the water vapor is limited to the edge length of the edge sealing block, if the water vapor breaks through the bonding surface of the edge sealing block and the edge sealing adhesive entering the protection block 22b and the driving bottom plates, the water vapor can be driven into the gap of the junction of two adjacent driving bottom plates for a long time because the adhesive is mostly glass adhesive without hydrophobicity, and the service life of the display is affected.

The applicant discovers that the technical problem of the structure is solved, so that the sealing structure is improved, and the problem of water vapor invasion is effectively solved.

Disclosure of Invention

The invention provides a sealing structure for a flexible spliced electrophoretic display, which can effectively solve the problem of water vapor invasion.

The invention discloses a sealing structure for a flexible spliced electrophoretic display, which comprises the following components:

at least two limiting bodies adhered to the bottoms of the FPCs, wherein the two limiting bodies are respectively arranged on two sides of the boundary line of the two FPCs;

the longitudinal continuous part of the limiting body is not shorter than the length of the boundary line of the two FPCs;

a water vapor isolation material is filled between the two limit bodies;

the water vapor isolation material is tightly connected with the two FPCs and the two limiting bodies.

Alternatively to this, the method may comprise,

the two limiting bodies are connected with a plate body;

the board body covers the juncture of the two FPC.

Alternatively to this, the method may comprise,

the plate body covers the two limit bodies.

Alternatively to this, the method may comprise,

the plate body is embedded between the two limiting bodies.

Alternatively to this, the method may comprise,

the water vapor isolation material is tightly connected with the plate body.

Alternatively to this, the method may comprise,

the cross section of the limiting body is regular or irregular.

Optionally, an optional

The cross section of the limiting body is round, trapezoidal or rectangular.

Alternatively to this, the method may comprise,

the water vapor isolation material is sealant.

Alternatively to this, the method may comprise,

the moisture barrier material comprises at least one of polysilicongate, polyurethane, cured heat applied sealant, hot melt butyl, and polyisobutylene.

Alternatively to this, the method may comprise,

the height of the limiting body is 0.1-0.2 mm.

The invention also provides a spliced electrophoretic display applying the sealing structure for the flexible spliced electrophoretic display, which comprises the following components:

the display material layer and at least two FPCs are arranged in parallel, and the two FPCs are respectively and tightly attached to the display material layer;

the sides of the two FPC layers are in butt joint, and the water vapor isolation material seals the joint line of the two FPC layers.

Compared with the prior art, the invention has the following beneficial effects:

the sealing structure for the flexible spliced electrophoretic display comprises at least two limiting bodies bonded with the bottoms of the FPCs, wherein the two limiting bodies are respectively arranged at two sides of the boundary line of the two FPCs; the longitudinal continuous part of the limiting body is not shorter than the length of the boundary line of the two FPCs; a water vapor isolation material is filled between the two limit bodies; the water vapor isolation material is tightly connected with the two FPCs and the two limiting bodies. Wherein, steam isolation material has the effect of preventing steam intrusion into the boundary line of two FPCs. The defects in the prior art are mainly that water vapor breaks through the edge sealing adhesive at the edge of the protection block and can enter between two FPC. Compared with the prior art, the technical scheme of the application keeps apart the steam on steam isolating material top outside, if need get into FPC and need pass steam isolating material, steam around the spacing body gets into FPC in advance, at first will pass through the junction of spacing body and FPC, then will pass through steam isolating material, because steam isolating material has the technological effect that prevents steam invasion, therefore this technical scheme has and prevents steam long-drive in the gap of the juncture of two adjacent FPC, further prolongs the life of this display.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic diagram of a prior art electrophoretic display structure;

FIG. 2 is a schematic diagram of a seal structure for a flexible tiled electrophoretic display in accordance with one embodiment of the present invention;

FIG. 3 is a schematic diagram of another embodiment of a seal structure for a flexible tiled electrophoretic display in accordance with the present invention;

fig. 4 is a schematic structural diagram of a tiled electrophoretic display according to an embodiment of the present invention.

Icon: 1-a substrate layer; 2-an electrophoretic display layer; 3-FPC; 31-a first FPC; 32-a second FPC 4-mating line; 51-a first limiting body; 52-a second limiting body; 6-a water vapor barrier material; 7-plate body.

Detailed Description

Hereinafter, embodiments of the present disclosure will be described with reference to the accompanying drawings. It should be understood that the description is only exemplary and is not intended to limit the scope of the present disclosure. In addition, in the following description, descriptions of well-known structures and techniques are omitted so as not to unnecessarily obscure the concepts of the present disclosure.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the disclosure. The words "a", "an", and "the" as used herein are also intended to include the meaning of "a plurality", etc., unless the context clearly indicates otherwise. Furthermore, the terms "comprises," "comprising," and the like, as used herein, specify the presence of stated features, steps, operations, and/or components, but do not preclude the presence or addition of one or more other features, steps, operations, or components.

All terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art unless otherwise defined. It should be noted that the terms used herein should be construed to have meanings consistent with the context of the present specification and should not be construed in an idealized or overly formal manner.

To solve the above-mentioned problems, an embodiment of a sealing structure for a flexible tiled electrophoretic display according to the present invention, please refer to fig. 2, includes:

the boundary line 4 between the first FPC31 and the second FPC32, the first stopper 51, and the second stopper 52. The first stopper 51 is tightly adhered to the first FPC31, and the first stopper 52 is tightly adhered to the second FPC 32. The first and second stoppers 51 and 52 are disposed on both sides of the boundary line 4 between the first and second FPCs. The first limiting body and the second limiting body are generally strip-shaped, the length of the limiting body is matched with the size of the FPC, and the length of the limiting body can be set according to the size of the FPC. The cross section of the limiting body can be regular patterns or irregular patterns, and the cross section of the general limiting body is circular, trapezoidal or rectangular. The limit body with the trapezoid and rectangular cross section is provided with an upper surface and a lower surface which can be used for bonding with other interfaces. The limiting body may be one or more pieces, which are not particularly limited herein.

The limiting body can be a single-sided or double-sided adhesive tape with a certain thickness for facilitating connection. The water vapor isolation material 6 is filled between the first limiting body 51 and the second limiting body 52, the water vapor isolation material 6 is generally in a liquid state, the water vapor isolation material is filled between the first limiting body 51 and the second limiting body 52, the space formed by the first limiting body 51 and the second limiting body 52 and the first FPC31 and the second FPC32 is filled, the water vapor isolation material 6 has a fixed form after solidification, and the water vapor isolation material 6 can be tightly adhered to the first limiting body 51 and the second limiting body 52 and can be tightly adhered to the first FPC31 and the second FPC 32. Moisture barrier materials the moisture barrier materials include at least one of polysilicone, polyurethane, cured heat applied sealants, hot melt butyl and polyisobutylene. In order to make the electrophoretic display light and thin, and the thickness of the water vapor barrier material is moderate, in practical application, the height of the limiting body can be set to be 0.1-0.2 mm.

In this embodiment, as shown in fig. 2, the vapor a at the top end of the vapor isolation material is isolated, if the FPC needs to pass through the vapor isolation material, the dashed line is a movement path required for the vapor a to break through the vapor isolation material, and compared with the prior art, the difficulty of breaking through the vapor a is further increased. The steam A around the limiting body enters the FPC in advance, firstly, the connection part of the limiting body and the FPC is needed to pass through the steam isolation material, and the steam isolation material has the technical effect of preventing steam intrusion, so that the technical scheme has the effect of preventing steam from being driven into gaps at the junction of two adjacent FPCs in a long way, and the service life of the display is further prolonged.

A second embodiment of a sealing structure for a flexible tiled electrophoretic display according to the present invention, referring to fig. 3, includes:

the boundary line 4 between the first FPC31 and the second FPC32, the first stopper 51, and the second stopper 52. The first stopper 51 is tightly adhered to the first FPC31, and the first stopper 52 is tightly adhered to the second FPC 32. The first and second stoppers 51 and 52 are provided on both sides of the boundary line 4 between the first and second FPCs. The water vapor isolation material 6 is filled between the first limiting body 51 and the second limiting body 52, the water vapor isolation material 6 is generally in a liquid state, the water vapor isolation material is filled between the first limiting body 51 and the second limiting body 52, the space formed by the first limiting body 51 and the second limiting body 52 and the first FPC31 and the second FPC32 is filled, the water vapor isolation material 6 has a fixed form after solidification, and the water vapor isolation material 6 can be tightly adhered to the first limiting body 51 and the second limiting body 52 and can be tightly adhered to the first FPC31 and the second FPC 32. The plate body 7 is tightly adhered with the first limiting body 51, the second limiting body 52 and the water vapor isolation material 6 respectively. The plate body 7 and the structure tightly adhered to the first limiting body 51, the second limiting body 52 and the water vapor isolation material 6 respectively have the following two conditions, and the plate body 7 covers the first limiting body and the second limiting body, or the plate body 7 is arranged between the first limiting body and the second limiting body.

In this embodiment, as shown in fig. 3, compared with the previous embodiment, the moisture a at the top end of the moisture isolation material is isolated by the plate body 7, so that the difficulty of entering the moisture is further increased, if entering the FPC needs to pass through the moisture isolation material, the dotted line is the movement path required by the moisture a to break through the moisture isolation material, and compared with the prior art, the difficulty of breaking through the moisture a is further increased. The steam A around the limiting body enters the FPC in advance, firstly, the connection part of the limiting body and the FPC is needed to pass through the steam isolation material, and the steam isolation material has the technical effect of preventing steam intrusion, so that the technical scheme has the effect of preventing steam from being driven into gaps at the junction of two adjacent FPCs in a long way, and the service life of the display is further prolonged.

Referring to fig. 3 and 4, an embodiment of a tiled electrophoretic display according to the present invention includes: a substrate layer 1, an electrophoretic display layer 2 formed on the substrate layer 1, and the electrophoretic display layer 2 is tightly connected with the FPC. Wherein, the boundary line 4 between the first FPC31 and the second FPC32, the first limiting body 51 and the second limiting body 52. The first stopper 51 is tightly adhered to the first FPC31, and the first stopper 52 is tightly adhered to the second FPC 32. The first and second stoppers 51 and 52 are provided on both sides of the boundary line 4 between the first and second FPCs. The water vapor isolation material 6 is filled between the first limiting body 51 and the second limiting body 52, the water vapor isolation material 6 is generally in a liquid state, the water vapor isolation material is filled between the first limiting body 51 and the second limiting body 52, the space formed by the first limiting body 51 and the second limiting body 52 and the first FPC31 and the second FPC32 is filled, the water vapor isolation material 6 has a fixed form after solidification, and the water vapor isolation material 6 can be tightly adhered to the first limiting body 51 and the second limiting body 52 and can be tightly adhered to the first FPC31 and the second FPC 32. The plate body 7 is tightly adhered with the first limiting body 51, the second limiting body 52 and the water vapor isolation material 6 respectively. The plate body 7 and the structure tightly adhered to the first limiting body 51, the second limiting body 52 and the water vapor isolation material 6 respectively have the following two conditions, and the plate body 7 covers the first limiting body and the second limiting body, or the plate body 7 is arranged between the first limiting body and the second limiting body. The plate 7 may be one or more pieces, which are not described in detail herein.

In this embodiment, steam A on steam isolation material top is kept apart by plate body 7, has further increased the degree of difficulty that steam got into, if need pass steam isolation material for getting into FPC, and the broken line is steam A and breaks through the required motion route of steam isolation material, compares in prior art, steam A breaks through the degree of difficulty and further increases. The steam A around the limiting body enters the FPC in advance, firstly, the connection part of the limiting body and the FPC is needed to pass through the steam isolation material, and the steam isolation material has the technical effect of preventing steam intrusion, so that the technical scheme has the effect of preventing steam from being driven into gaps at the junction of two adjacent FPCs in a long way, and the service life of the display is further prolonged.

In this embodiment, the core element of the display material layer is electrophoretic pigment particles, and the particle size distribution, the surface morphology, the zeta potential, the optical performance and the chemical performance of the electrophoretic pigment particles play a key role in the contrast, the response time, the definition and the service life of the electronic paper. The electrophoresis display technology utilizes the electrophoresis principle in colloid chemistry to disperse charged pigment particles stably in a non-water system dispersing medium containing dye, so that the dispersing phase and the dispersing medium show contrast, and charged pigment ions move to the surface of an electrode under the action of an electric field to display images.

In this embodiment, one structure of the electrophoretic pigment particle includes a core and a shell layer, the core is a pigment particle, and the shell layer includes a high molecular polymer and a coupling agent for coupling the high molecular polymer and the pigment particle. The pigment particles comprise positive pigment particles, negative pigment particles or neutral pigment particles, and are specifically selected from one or more than two of carbon black, copper-chromium black, copper-iron-manganese black, iron black, titanium dioxide, zinc white, barium sulfate, iron oxide red, iron oxide yellow, ultramarine, chrome yellow, cadmium red, manganese violet, chrome green, iron blue and cobalt blue. The coupling agent is one or more than two of 3-aminopropyl triethoxysilane (KH 550), gamma- (2, 3-epoxypropoxy) propyl trimethoxysilane (KH 560), gamma- (methacryloyloxy) propyl trimethoxysilane (KH 570), gamma-mercaptopropyl trimethoxysilane (KH 580), N-beta- (aminoethyl) -gamma-aminopropyl trimethoxysilane (KH 792), vinylbenzyl aminoethylaminopropyl trimethoxysilane (VAPMS) and isopropyl trioleate acyloxy titanate. In order to ensure that the average particle size of the electrophoretic pigment particles meets the requirement, the applicant performs micron treatment on the electrophoretic pigment particles, and in practical application, the electrophoretic pigment particles can be realized by adopting methods such as grinding, crushing, ultrasonic or solvent dispersion, and related equipment can comprise a colloid mill, a ball mill, a freezing crusher, an ultrasonic machine and the like.

The main components of the electrophoretic fluid include, but are not limited to, a dispersant, a thickener, a surface tension controlling agent, and a charge controlling agent. Wherein the dispersing agent comprises various nonpolar and/or low polar organic solvents and mixtures thereof, and the low polar dispersing solvents comprise but are not limited to various aromatic hydrocarbons such as toluene, benzene, xylene, and halogenated hydrocarbons such as but not limited to chloroform, tetrachloroethylene, etc.; nonpolar dispersing solvents include, but are not limited to, straight, branched, and cyclic aliphatic hydrocarbons such as n-hexane, nonane, decane, synthetic isoparaffins (Isopar), synthetic paraffins (Norpar), synthetic cycloparaffins (Nappar), synthetic alkanes (Varsol/naptha), cyclohexane, and halogenated hydrocarbons such as carbon tetrachloride; the thickener may be a nonpolar polymer including, but not limited to, polymethyl methacrylate, polyethylene, polypropylene, rubber such as polyisoprene, polyisobutylene, etc., wherein polymethyl methacrylate, polyisoprene, polyisobutylene are the most preferred choice; in addition, the surface tension control agent can be one or more than two of glyceryl monostearate, ethyl-based hydroxyethyl methyl ammonium methyl sulfate, span20, span40, span60, span80, tween85 and alkyl tertiary amine salt; the charge control agent may be an organic sulfate, sulfonate, metal soap, organic amide, organic phosphate or phosphate, and may also be a polymer and a block or graft copolymer and their monomers. Polyisobutene succinimide, metal saponified material, lecithin poly or isobutylene and organosilicon derivative can be selected as charge control agent.

The electrophoretic fluid and the electrophoretic pigment particles dispersed in the electrophoretic fluid are wrapped in the display unit, so that aggregation of the electrophoretic pigment particles is effectively inhibited, and the stability and the service life of the display device are improved. The display unit may include at least one of a microcapsule and a micro cup in this embodiment. The microcapsule in this embodiment includes the above-mentioned electrophoretic fluid, electrophoretic pigment particles dispersed in the electrophoretic fluid, and at least one layer of capsule wall, where the capsule wall is a capsule wall formed by a complex coacervation method or a capsule wall formed by an in-situ polymerization method. In-situ polymerization can also be called interfacial polymerization, and urea resin or modified urea resin is used as microcapsule wall material; the complex coacervation method adopts gelatin and acacia as microcapsule wall materials. The micro-cup in this embodiment includes an electrophoretic fluid, and electrophoretic pigment particles and micro-cups dispersed in the electrophoretic fluid, and the micro-cups may be cylinders having a small size, a cavity, and upper and lower seals. The micro-cup is manufactured by die casting a micro-cup roller and hardening and forming by ultraviolet rays, and then the electrophoretic pigment particles in the electrophoretic fluid are encapsulated in the micro-cup by a specific method.

The structure of the display device in this embodiment includes, but is not limited to, a display layer containing a cured medium, and an electrophoretic fluid distributed in the cured medium and at least one electrophoretic pigment particle dispersed in the electrophoretic fluid; the display layer is connected with the transparent conductive layer through an adhesive.

One preparation method of the display layer in this embodiment is to mix a transparent adhesive, a display unit containing an electrophoretic fluid, such as a microcapsule or a micro-cup, and other solvents according to a predetermined ratio, and uniformly mix the obtained mixed fluid and then apply the mixed fluid on a substrate. In actual processing, the mixture may be coated on a substrate by a slot die coating process. The slot extrusion coating process may be such that the coating material is extruded from the extrusion port of the coating die after being pressurized by a metering pump and coated on the surface of the substrate. The thickness of the coating layer may be determined according to the coating extrusion amount of the coating die and the running speed of the substrate. The applicant can preset the gap of the extrusion port and the distance between the extrusion port and the back roller, thereby realizing the control of the process. And then curing, wherein it is understood that the curing process can be realized at normal temperature, and in order to accelerate the curing speed, the rapid curing can be realized by conventional curing means such as heating, bellows drying or photo-curing. It should be noted that instead of the slit extrusion coating process, a coating method such as a blade coating method, a casting coating method, a brush coating method, a roll coating method, a spray coating method, a powder coating method, or the like, and a screen printing and ink-jet printing process may be employed. The adhesive mentioned in the embodiment comprises an aqueous polyurethane emulsion or a solvent polyurethane emulsion, and specifically comprises one or a combination of more than two of polyester glycol, polyether glycol, polyethylene glycol, small molecule chain extender and diisocyanate. The transparent conductive layer may be ITO (Indium Tin Oxides, indium tin metal oxide), also referred to as a semiconductor transparent conductive film, obtained by forming a transparent Indium Tin Oxide (ITO) conductive film plating layer on a transparent organic film material such as PET (Polyethylene terephthalate ), PE (polyethylene), PP (polypropylene), or the like and performing a high temperature annealing treatment. The preparation method of the ITO transparent conductive film comprises, but is not limited to, evaporation, sputtering, reactive ion plating, chemical vapor deposition, thermal spraying and other technological methods. In practical application, the ITO transparent conductive film can be replaced by conductive films such as graphene, silver powder or nano silver wires. Graphene has extremely high advantages in conductivity and hardness, so that the graphene is suitable for manufacturing a conductive film. The preparation method of the graphene conductive film comprises, but is not limited to, a chemical vapor deposition method and a redox method. The chemical vapor deposition can obtain large single-layer graphene with better quality, has performance advantages in light transmittance and surface resistance, but has the defects of complex process route, high cost, low yield, limited film area and the like. The redox method adopts a solution process, is convenient for realizing large-area continuous preparation by a roll-to-roll process, and has great advantages in cost. The silver powder conductive film takes silver conductor slurry as a main material, wherein silver powder is taken as a conductive functional material, and the conductivity and the thermal conductivity of the silver powder are mainly utilized. The silver powder can be divided into coarse silver powder and nano silver wires according to the particle size, wherein the average particle size is less than 0.1 mu m; 0.1 μm < Dav <10.0 μm is a crude silver powder. The nano silver wire has excellent conductivity, excellent light transmittance and flexibility resistance due to the size advantage of nano level, and thus can be used as a preferable material for replacing ITO. The FPC in this embodiment can be applied to a flexible tiled electrophoretic display.

Finally, it should be noted that: the embodiment of the present invention is only a preferred embodiment of the present invention, and is only used for illustrating the technical scheme of the present invention, but not limiting the technical scheme; although the invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art will understand that; the technical scheme recorded in the various embodiments can be modified or part of technical features in the technical scheme can be replaced equivalently; such modifications and substitutions do not depart from the spirit and scope of the corresponding technical solutions.

Claims (10)

1. A sealing structure for a flexible tiled electrophoretic display, comprising:

at least two limiting bodies adhered to the bottoms of the FPCs, wherein the two limiting bodies are respectively arranged on two sides of the boundary line of the two FPCs;

the longitudinal continuous part of the limiting body is not shorter than the length of the boundary line of the two FPCs;

a water vapor isolation material is filled between the two limit bodies;

the water vapor isolation material is tightly connected with the two FPCs and the two limiting bodies.

2. The sealing structure for a flexible tiled electrophoretic display according to claim 1, wherein:

the two limiting bodies are connected with a plate body;

the board body covers the juncture of the two FPC.

3. The sealing structure for a flexible tiled electrophoretic display according to claim 2, wherein:

the plate body covers the two limit bodies.

4. The sealing structure for a flexible tiled electrophoretic display according to claim 2, wherein:

the plate body is embedded between the two limiting bodies.

5. The sealing structure for a flexible tiled electrophoretic display according to claim 2, wherein:

the water vapor isolation material is tightly connected with the plate body.

6. The sealing structure for a flexible tiled electrophoretic display according to claim 1, wherein:

the cross section of the limiting body is regular or irregular.

7. The sealing structure for a flexible tiled electrophoretic display according to claim 6, wherein:

the cross section of the limiting body is round, trapezoidal or rectangular.

8. The sealing structure for a flexible tiled electrophoretic display according to any of claims 1-7, wherein:

the water vapor isolation material is sealant.

9. The sealing structure for a flexible tiled electrophoretic display according to any of claims 1-7, wherein:

the moisture barrier material comprises at least one of polysilicongate, polyurethane, cured heat applied sealant, hot melt butyl, and polyisobutylene.

10. The sealing structure for a flexible tiled electrophoretic display according to any of claims 1-7, wherein:

the height of the limiting body is 0.1-0.2 mm.

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