CN102103298A - Electrophoresis display panel and manufacturing method thereof - Google Patents
Electrophoresis display panel and manufacturing method thereof Download PDFInfo
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- CN102103298A CN102103298A CN2009102275135A CN200910227513A CN102103298A CN 102103298 A CN102103298 A CN 102103298A CN 2009102275135 A CN2009102275135 A CN 2009102275135A CN 200910227513 A CN200910227513 A CN 200910227513A CN 102103298 A CN102103298 A CN 102103298A
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Abstract
The invention discloses an electrophoresis display panel. The electrophoresis display panel comprises a base material and at least two microcapsule layers coated on the base material. Through two-layer coating of electrophoresis display microcapsules, the damage to microcapsules and coating defects can be reduced to the maximum extent, the coating quality of the microcapsules is improved, the coating thickness is reduced, electrophoresis display performance and bendability performance can be improved obviously, the microcapsules with the wide distribution range of the particle diameter can be reasonably distributed and used and the utilization rate of the electrophoresis display microcapsules is improved.
Description
Technical field
The present invention relates to the manufacture method of a kind of electrophoretic display apparatus and electrophoretic display apparatus, be specifically related to coating structure, material and the manufacture method thereof of electrophoretic display panel.
Background technology
Electrophoretic display technology is owing to combine the advantage of plain paper and electronic console, thereby is the technology that most possibly realizes the electronic paper industrialization.It is shown one's talent from numerous display techniques at present, becomes one of flexible electronic display technique that has development potentiality.
Electrophoretic display device (EPD) is based on the non-emissive display device that the electrophoresis that is suspended in the charged pigment particles in the dispersion medium is made.This device is provided with two electrode of opposite pole plates usually, and one of them electrode is transparent.The suspending liquid that includes dispersion medium and charged pigment particles is encapsulated between two electrode pads.When applying voltage between two electrodes, pigment particle directed moving in electric field migrates to a side, can see the color of pigment or dispersion medium in transparency electrode one side.Pigment particle can be static when electric field does not exist, and display image can be kept.
For fear of undesirable precipitation and cohesion will take place, between two electrodes, separate usually, form less space cell.Method can be that the dispersion liquid with charged pigment particles injects previously prepared small netted interval.Also the dispersion liquid of charged pigment particles can be wrapped in the microcapsules of being made by transparent polymer, and then the electrophoretic display microcapsule that obtains is coated on the electrode base sheet surface, can constitute sheet electrophoretic display apparatus with flexibility.
Electrophoretic display microcapsule can adopt various coating techniques, comprises slit die extrusion coated, airblade coating and gravure coating etc.These technology are in U.S. Pat 5,930,026, US5,961,804 and Jap.P. 2005-153509 in be described.
Best individual layer of electrophoretic display microcapsule and dense being coated on the substrate.In case microcapsules are with several coincidences or very big gap is arranged between microcapsules, will cause display performance variation and display defect.In fact, the individual layer of microcapsules and dense distribution are a kind of perfect conditions, because microcapsules have certain particle size distribution range, and the deviation of THICKNESS CONTROL during coating, big microcapsule granule is easy to cause the space, and smaller particles tends to overlap.When this external coating was thin, the microcapsules that particle diameter is bigger were easy to sustain damage, and caused showing losing efficacy, and often were forced to adopt higher microcapsule layer thickness, inevitably brought the microcapsules COINCIDENCE PROBLEMS.Method in the aforementioned patent can only be by optimizing painting parameter, control coating thickness as far as possible, and can not fundamentally solve the too much coincidence and the void defects of microcapsule layer.
Summary of the invention
The breakage of microcapsules and holiday when the microcapsule layer of the technical problem to be solved in the present invention electrophoretic display panel is individual layer, coating thickness reduces, and a kind of electrophoretic display panel and manufacture method thereof that is coated with two-layer microcapsule layer is provided.
Technical scheme of the present invention is: a kind of electrophoretic display panel, comprise base material and the microcapsule layer that is coated on the base material, and described microcapsule layer is at least two-layer.
Described microcapsule layer is two-layer.
Described two-layer microcapsule layer has the microcapsules of same concentrations.
Described two-layer microcapsule layer has the microcapsules of variable concentrations, and second layer microcapsules concentration ratio ground floor microcapsules concentration is low.
Described two-layer microcapsule layer has the microcapsules of same particle size scope.
Described two-layer microcapsule layer has the microcapsules of different-grain diameter scope, and second layer microcapsules particle diameter ratio ground floor microcapsules particle diameter is little.
Second layer microcapsule layer contains the compound bonding agent of using in the described microcapsule layer.
The manufacture method of electrophoretic display panel comprises the preparation microcapsule layer, and microcapsule layer is coated on the base material, and described microcapsule layer is coating or gradation coating simultaneously.
The invention has the beneficial effects as follows: this method is by the two-layer coating of electrophoretic display microcapsule, can farthest reduce the breakage and the holiday of microcapsules, improve the microencapsulation coating quality, reduce coating thickness, electrophoresis showed performance and flexible performance significantly improve, microcapsules to the relative broad range size distribution have carried out the reasonable distribution use simultaneously, have improved the utilization factor of electrophoretic display microcapsule.
In second microcapsule layer, can use the compound bonding agent of using of part or all of use, coating composite adhesive layer can be set separately like this.On second microcapsule layer, can directly paste peelable film protection, perhaps directly and the drive electrode substrate compound.
Embodiment
Below in detail and specifically describe structure, material and the manufacture method thereof of electrophoretic display panel of the present invention.But scope of the present invention is not subjected to any restriction of these explanations, beyond the explanation below, can make suitable change in the point range of the present invention wanting, and still comprises within the scope of the invention.
The electrophoresis showed that the present invention relates to forms the coating that contains electrophoretic display microcapsule with the manufacture method of panel on base material, it is characterized in that the electrophoretic display microcapsule layer is the two-layer or two-layer above coating of branch.Here " electrophoretic display microcapsule " is meant, is enclosed with the microcapsules of the dispersion liquid of electrophoresis displaying particle and dispersion medium thereof in the polymer capsule housing.
The electrophoresis showed base material is the film that has conductive layer, adopts polyethylene terephthalate (PET) or PEN (PEN) film that has indium tin oxide (ITO) transparency conducting layer usually.Also can adopt be applied to other base material after, transfer to the mode on this type of base material.The thickness of base material is not particularly limited, and is preferred more than 50 microns below 200 microns.Layer at transparent layer resistance preferably is in below 1000 Ω.
The coating of electrophoresis microcapsule can be used the multiple accurately coating process of control coating thickness, comprises scraper type coating, slit extrusion coated, the coating of gravure roller etc.The coating wet-film thickness is usually between 20～500 microns, preferably between 50～300 microns.Dry back microcapsule layer thickness is between 20～150 microns.
Coating process of the present invention changes coating method of original microcapsules into repeatedly coating method, and electrophoretic display microcapsule divides two-layer or two-layer above coating, forms well behaved microcapsule layer.Typically, microcapsule layer is two-layer, and second microcapsule layer can well remedy the local defect of first microcapsule layer, simultaneously it is played certain protective role, and does not significantly increase the gross thickness of microcapsule layer.
Two electrophoretic display microcapsule layers can be while or gradation coating.Two electrophoretic display microcapsule layers can have identical microcapsules concentration and also can have different microcapsules concentration, preferably use the coating fluid of low concentration microcapsules in second microcapsule layer.Two electrophoretic display microcapsule layers have identical microcapsule granule diameter and also can have different microcapsule granule diameters, preferably use the coating fluid than the small particle diameter microcapsules in second microcapsule layer.The microcapsule granule of certain grain size distribution scope can be sieved, will be than big more microcapsule granule as first microcapsule layer, and less less microcapsule granule is coated with as second microcapsule layer.
In second microcapsule layer, can use part or all of use compound, coating composite adhesive layer can be set separately like this with bonding agent (pressure-sensitive or heat sensitive adhesive).On second microcapsule layer, can directly paste peelable film protection, perhaps directly and the drive electrode substrate compound.
Embodiment 1
The self-control electrophoretic display microcapsule of 65 microns of mean grain sizes used 100,50,25 microns screen cloth wet sieving, discard more than 100 microns and 25 microns with the lower part, filter and obtained 100～50 microns microcapsules thickener 1 (microcapsule content about 50%) and 50～25 microns microcapsules thickener 2 (microcapsule content about 45%) after dewatering.Microcapsules thickener 1,2 part by weight are 3: 1.
After microcapsules thickener 1 and polyurethane binder mixed with 4: 1 weight ratios, obtain microcapsules coating fluid 1, be coated on the ito thin film with the scraper coating method, 200 microns of coating thicknesss with 60 ℃ of heated-air dryings 5 minutes, obtain microencapsulation coating 1.
After microcapsules thickener 2 and polyurethane binder mixed with 1: 4 weight ratio, obtain microcapsules coating fluid 2, be coated on the microencapsulation coating 1 with the scraper coating method, 100 microns of coating thicknesss, with 60 ℃ of heated-air dryings 3 minutes, obtain final electrophoresis microcapsule layer, 120 microns of thickness.
The electrophoresis microcapsule coating that this example obtains is smoothly even, does not have microcapsules rupture and holiday to exist.
Embodiment 2
1,2 preparations of microcapsules thickener and microencapsulation coating 1 are with example 1, after microcapsules thickener 2 and polyurethane binder, acrylic pressure-sensitive adhesive mixed with 1: 2: 2 weight ratio, be coated on the microencapsulation coating 1 with the scraper coating method, 100 microns of coating thicknesss, with 60 ℃ of heated-air dryings 3 minutes, paste peelable film, obtain the microcapsules film.
The electrophoresis microcapsule coating that this example obtains is smoothly even, does not have microcapsules rupture and holiday to exist.
Embodiment 3
1,2 preparations of microcapsules thickener and 1,2 preparations of microcapsules coating fluid are with example 1, two coating fluids are coated on the ito thin film in double aperture slit extrusion coated mode simultaneously, coating thickness is respectively 200,100 microns, with 60 ℃ of heated-air dryings 6 minutes, obtains 120 microns of microencapsulation coating thickness.
The electrophoresis microcapsule coating that this example obtains is smoothly even, does not have microcapsules rupture and holiday to exist.
Embodiment 4
1,2 preparations of microcapsules thickener and microencapsulation coating 1,2 are with example 1, after microcapsules thickener 2 and acrylic pressure-sensitive adhesive mixed with 1: 4 weight ratio, be coated on the microencapsulation coating 2 with the scraper coating method, 80 microns of coating thicknesss, with 60 ℃ of heated-air dryings 3 minutes, paste peelable film, obtain the microcapsules film.
The electrophoresis microcapsule coating that this example obtains is smoothly even, does not have microcapsules rupture and holiday to exist.
Comparative Examples 1
Use 100,25 microns screen cloth to sieve the electrophoretic display microcapsule of 65 microns of mean grain sizes, discard more than 100 microns and 25 microns with the lower part, obtained 100～25 microns microcapsules thickener (microcapsule content about 50%), after mixing with 4: 1 weight ratios with polyurethane binder, be coated on the ito thin film with the scraper coating method, 240 microns of coating thicknesss with 60 ℃ of heated-air dryings 5 minutes, obtain 120 microns of microencapsulation coating thickness.
The uneven cunning of electrophoresis microcapsule coating surface that this Comparative Examples obtains has a small amount of space between microcapsules.
Comparative Examples 2
Microcapsules paste formulation and coating process be with Comparative Examples 1, and 300 microns of coating thicknesss with 60 ℃ of heated-air dryings 6 minutes, obtain 150 microns of microencapsulation coating thickness.
The slightly uneven cunning of the electrophoresis microcapsule coating surface that this Comparative Examples obtains does not have the space between microcapsules, coating is thick partially.
Comparative Examples 3
Use 75,25 microns screen cloth to sieve the electrophoretic display microcapsule of 65 microns of mean grain sizes, obtain 75～25 microns microcapsules thickener (microcapsule content about 50%), microcapsules paste formulation and coating process are with Comparative Examples 1,260 microns of coating thicknesss, with 60 ℃ of heated-air dryings 5 minutes, obtain 130 microns of microencapsulation coating thickness.
The electrophoresis microcapsule coating that this Comparative Examples obtains is smoothly even, does not have microcapsules rupture and holiday to exist.
In the foregoing description and the Comparative Examples, polyurethane binder commodity are called TC-403, and available from sky, Guangdong patina worker, the acrylic pressure-sensitive adhesive commodity are called SYM-3, available from Shenzhen Jitian's chemical industry.
Claims (8)
1. an electrophoretic display panel comprises base material and the microcapsule layer that is coated on the base material, it is characterized in that described microcapsule layer is at least two-layer.
2. electrophoretic display panel according to claim 1 is characterized in that described microcapsule layer is two-layer.
3. electrophoretic display panel according to claim 2 is characterized in that described two-layer microcapsule layer has the microcapsules of same concentrations.
4. electrophoretic display panel according to claim 2 is characterized in that described two-layer microcapsule layer has the microcapsules of variable concentrations, and second layer microcapsules concentration ratio ground floor microcapsules concentration is low.
5. electrophoretic display panel according to claim 2 is characterized in that described two-layer microcapsule layer has the microcapsules of same particle size scope.
6. electrophoretic display panel according to claim 2 is characterized in that described two-layer microcapsule layer has the microcapsules of different-grain diameter scope, and second layer microcapsules particle diameter ratio ground floor microcapsules particle diameter is little.
7. electrophoretic display panel according to claim 2 is characterized in that second layer microcapsule layer contains the compound bonding agent of using in the described microcapsule layer.
8. the manufacture method of electrophoretic display panel as claimed in claim 1 comprises the preparation microcapsule layer, and microcapsule layer is coated on the base material, it is characterized in that, described microcapsule layer is coating or gradation coating simultaneously.
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| CN2009102275135A CN102103298A (en) | 2009-12-17 | 2009-12-17 | Electrophoresis display panel and manufacturing method thereof |
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| CN2009102275135A CN102103298A (en) | 2009-12-17 | 2009-12-17 | Electrophoresis display panel and manufacturing method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103091926A (en) * | 2013-02-06 | 2013-05-08 | 广州奥翼电子科技有限公司 | Electrophoresis display assembly, electrophoresis displayer and preparation method of the same |
| JP2022058931A (en) * | 2017-06-16 | 2022-04-12 | イー インク コーポレイション | Variable transmission electrophoretic devices |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20070068882A (en) * | 2005-12-27 | 2007-07-02 | 엘지.필립스 엘시디 주식회사 | Display device having multi-layer electronic ink and method for manufacturing thereof |
-
2009
- 2009-12-17 CN CN2009102275135A patent/CN102103298A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20070068882A (en) * | 2005-12-27 | 2007-07-02 | 엘지.필립스 엘시디 주식회사 | Display device having multi-layer electronic ink and method for manufacturing thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103091926A (en) * | 2013-02-06 | 2013-05-08 | 广州奥翼电子科技有限公司 | Electrophoresis display assembly, electrophoresis displayer and preparation method of the same |
| CN103091926B (en) * | 2013-02-06 | 2019-01-25 | 广州奥翼电子科技股份有限公司 | Electrophoresis showed component, electrophoretic display device (EPD) and preparation method thereof |
| JP2022058931A (en) * | 2017-06-16 | 2022-04-12 | イー インク コーポレイション | Variable transmission electrophoretic devices |
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Application publication date: 20110622 |