CN103091926A - Electrophoresis display assembly, electrophoresis displayer and preparation method of the same - Google Patents
Electrophoresis display assembly, electrophoresis displayer and preparation method of the same Download PDFInfo
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Abstract
The invention belongs to the field of electrophoresis display and particularly relates to an electrophoresis display assembly. The electrophoresis display assembly comprises a transparent first electrode and photoelectricity media attached to the lateral side of the first electrode, wherein the photoelectricity media are provided with microcapsule and adhesives, the microcapsule is scattered in the adhesives and is fixed by the adhesives. The microcapsule is accommodated with suspension liquid and a plurality of types of granules in the suspension liquid, a plurality of each type of granules are provided, at least one kind of granules can be diffused under the influence of an electric field, and the microcapsule in the photoelectricity media is generally distributed in a double-layer structure. A distribution structure of double-layer microcapsule not only avoids the defects that a prior single-layer microcapsule is difficult to coat, low in good product rate, bad in photoelectricity performance and the like, but also improves effective display area of an electrophoresis displayer.
Description
Technical field
The present invention relates to a kind of display module and display, especially a kind of electrophoretic display device (EPD) and for the production of method and the assembly of this display.
Background technology
Thereby referring to a kind of effect that utilizes electric field, electrophoretic display device (EPD) make wherein a plurality of charged particles move the display of the optical states that changes its sightingpiston in suspending liquid.With liquid crystal display relatively, this display has the characteristic of gratifying brightness, high-contrast, wide visual angle, bistable state and low-power consumption and is subject to people's favor, has obtained significant progress by the research work that continues for many years.Above-mentioned " bistable state " has the implication that it is known in the art, and refers to comprise the show state that the display of display original set has at least a optical characteristics.
Yet, by years of researches and the application to electrophoretic display device (EPD), also found electrophoretic display device (EPD) picture quality relevant aspect shortcoming, and these shortcomings have seriously hindered their widespread use.For example, the agglomeration traits of particle, particle stable problem and the dispersed homogeneous degree problem of particle in suspending liquid in suspending liquid.
Some above-mentioned technological deficiencies that the method that adopts a large amount of encapsulation suspending liquid and particle has made up electrophoretic display device (EPD) have to a certain extent been described in many patents of having announced or having announced or patented claim.For example, Chinese patent CN1477608A provides a kind of micro-capsule composition for electrophoretic display device, but improved electrophoretic display apparatus long-time stability, show the number of rewrites of responsiveness, contrast, demonstration.The composition of this invention is that in containing in housing, bag electrophoresis particulate is dispersed in the dispersion liquid in solvent and microcapsules and composition water solvent, that be used for the modulation of coating fluid that the electrophoretic display apparatus that consists of is used, above-mentioned composition obtains without the operation of dry microcapsules, the microcapsules in above-mentioned composition to contain proportional be 30～80 % by weight.
In addition, OED has also obtained many achievements aspect microcapsules, and among the patented claim or patent documentation that disclose before achievement in research is disclosed in or announced.For example, a kind of preparation method of microcapsules array electrophoresis display module is disclosed in Chinese patent CN102809863A, it comprises the following steps: a) prepare the barricade array on the transparent substrates of transparency conducting layer, this barricade array and substrate have consisted of some small cavitys; B) inject corresponding electrophoretic display microcapsule in the target cavity of barricade array.In addition, also provide a kind of electrophoretic display coating fluid in Chinese patent CN102093785A, it includes microcapsules, includes suspending liquid and a plurality of charged pigment particles that are scattered in suspending liquid in microcapsules, and microcapsules are dispersed in adhesive.This adhesive is dissolved in water by water-soluble high-molecular compound and makes, and wherein the concentration of water-soluble high-molecular compound is 5%-20%.The percentage by weight of adhesive and microcapsules is 10%-70%.When adhesive was dry, microcapsules wherein had at least one deformation occurs.Wherein, the adhesive that adopts has effectively reduced the reunion between microcapsules, can produce certain differential contraction stress when drying, makes the dispersed better of microcapsules, thereby has effectively improved the photoelectric properties of electrophoretic display coating fluid.Again for example, another electrophoretic display coating fluid is provided in Chinese patent 102585676A, it includes microcapsules, these microcapsules are dispersed in adhesive, include suspending liquid and a plurality of charged particles that are scattered in suspending liquid in microcapsules, charged particle is meeting electrophoresis in suspending liquid under the effect of electric field; Also include the water-based blue dyes in above-mentioned electrophoretic display coating fluid, the percentage by weight of this water-based blue dyes and electrophoretic display coating fluid is 0.01%-5%.The B value of the electrophoretic display coating fluid made display screen out of this invention obviously improves, and also makes simultaneously the black white contrast of electrophoresis showed also be improved, thereby has effectively improved the photoelectric properties of electrophoretic display coating fluid.
Above-mentioned research work makes the performance of electrophoretic display device (EPD) at aspects such as stability, contrasts obtain improving to some extent.Yet the researchist still from many aspects, multi-angle done many elaborations, and hope can further improve the performance of electrophoretic display device (EPD) aspect the image demonstration.For example, European patent EP 1010036B1 and Japanese patent families JP4460149 thereof provide a kind of electrophoretic display device (EPD), it comprises display surface (viewed surface) and the back side (rear surface), has a polymer array (Polymer Matrix) between display surface and the back side, have some caves that hold suspending liquid and particle among this polymer array, wherein the ratio of width to height in cave is greater than 1.2.The technical matters that this patent will solve is in the situation that there are a large amount of gaps in the coating of individual layer capsule between capsule, makes actual effectively display area diminish.The document is claimed and can or be utilized the contraction of adhesive to make that thereby becoming of cave is flat can improve its optics display performance by mechanical force.
In theory, the display performance of electrophoretic display device (EPD) seemingly can be improved from some angle in the cave of flattening.But from the discussion of this patent documentation, as if as depicted in figs. 1 and 2, the structure that the cave need to be arranged to individual layer just might reach by the shrinkage of mechanical force or adhesive the ratio of width to height of making " cave " greater than 1.2 purpose.Although the researchist can be coated with into individual layer by methods such as meticulous regulation and control coating speeds with microcapsules in implementing the chamber, yet, in large-scale production application being a rather thing of difficulty.What worse is, also need to control the particular location in these " caves ", make " cave " just can fill gap between adjacent " cave " in deformation, improving effective displaying ratio of electrophoretic display device (EPD), and this is difficult to realize for a person skilled in the art.Therefore, as shown in Figure 3, inevitably there are a large amount of gaps in the arrangement of the microcapsules of individual layer between microcapsules, might cause on the contrary the effective display area of electrophoretic display device (EPD) reality to descend.
Summary of the invention
For the deficiencies in the prior art, order of the present invention ground is that a kind of electrophoresis showed assembly will be provided, and related manufacturing processes and electrophoretic display device (EPD).The researchist finds pleasantly surprisedly, and the microcapsules of controlling electrophoretic display device (EPD) by the thickness of controlling coating fluid form in photoelectric medium and are roughly two-layer arrangement and have beat all good display performance.
For this reason, first aspect present invention provides a kind of electrophoresis showed assembly, comprises the first transparent electrode, and the photoelectric medium that is attached to described the first electrode side; Described photoelectric medium has microcapsules and adhesive, and described microcapsules are scattered among described adhesive and by described adhesive to be fixed; Include suspending liquid and the polytype particle that is dispersed in described suspending liquid in described microcapsules, the particle of every type has some, wherein have at least the particle of a type to move under the effect of electric field, it is characterized in that, the microcapsules in described photoelectric medium are roughly two-layer arrangement.
In addition, second aspect present invention also provides a kind of electrophoretic display device (EPD), and it has above-mentioned electrophoresis showed assembly and one or more the second electrode, and described the second electrode is located at and is closed on described photoelectric medium side and relative with described the first electrode.
In addition, third aspect present invention provides a kind of preparation method who prepares above-mentioned electrophoresis showed assembly, comprises the following steps:
Microcapsules, adhesive and water are mixed obtain coating fluid;
Coating fluid is coated on the first transparent electrode, and making the coating fluid drying obtain thickness is photoelectric medium between the 20-60 micron, thereby makes the electrophoresis showed assembly.
And fourth aspect present invention also provides a kind of preparation method of electrophoretic display device (EPD), comprises following steps:
The ratio that is 1:8 according to weight ratio takes adhesive and water, and after adhesive was dissolved in the water, adding weight ratio was that 15 microcapsules carry out mix and blend with the stirring rate of 200-300rpm and made coating fluid in 1 hour;
The viscosity of controlling above-mentioned coating fluid is 70-250cp, then coating fluid is coated on the first electrode that transparent employing indium oxide material makes, and regulates coating speed take the coating thickness of controlling coating fluid as the 30-40 micron;
Described the first electrode and coating fluid are heating and curing, make the electrophoresis showed assembly;
With the coating fluid place side of described electrophoresis showed assembly by adhesive and the substrate with some second electrodes sticking and, make electrophoretic display device (EPD).
Below the invention will be further described.
All documents that the present invention quotes from, their full content is incorporated this paper by reference into, and, if when the implication that these documents are explained and the present invention are inconsistent, be as the criterion with statement of the present invention.In addition, various terms and phrase that the present invention uses have the general sense of well known to a person skilled in the art, nonetheless, the present invention still wishes at this, these terms and phrase to be described in more detail and to explain.The term of mentioning and phrase are as the criterion with the implication that the present invention was explained if any inconsistent with known implication.The below is described in further detail the present invention.
Concrete, according to the electrophoresis showed assembly that first aspect present invention provides, comprise the first transparent electrode, and the photoelectric medium that is attached to described the first electrode side; Described photoelectric medium has microcapsules and adhesive, and described microcapsules are scattered among described adhesive and by described adhesive to be fixed; Include suspending liquid and the polytype particle that is dispersed in described suspending liquid in described microcapsules, the particle of every type has some, wherein have at least the particle of a type to move under the effect of electric field, the microcapsules in described photoelectric medium are roughly two-layer arrangement.Above-mentioned " layer " refers to that microcapsules are stacked settings in adhesive, i.e. a large amount of microcapsules plane structure of the side that forms parallel and the first electrode that extends along the side of described the first electrode.
Wherein, described microcapsules are flat shape, and namely the ratio of width to height of described microcapsules is greater than 1, for example greater than 1.2, for example greater than 1.5, greater than 1.75.Term " height " refers to microcapsules in perpendicular to the projection in the plane of the side of described the first electrode, along perpendicular to the longest distance on the direction of the side of described the first electrode; Term " wide " refers in the projection of microcapsules in the plane of the side that is parallel to described the first electrode, along the longest distance on the direction of the side that is parallel to described the first electrode.Term " the ratio of width to height " refer to above-mentioned definition wide/high resulting numerical value.
The electrophoresis showed assembly that provides according to first aspect present invention, the particle diameter of described microcapsules is the 10-80 micron, the thickness of described photoelectric medium is between the 20-60 micron, for example 25 microns, 30 microns, 35 microns, 40 microns and 45 microns and 50 microns, be preferably the 30-50 micron, for example 36 microns, 38 microns and 40 microns.Above-mentioned phrase " particle diameter " has implication well known in the art, refer to its mean grain size, namely for a group by size and shape not identical the grain molecular actual population, with a hypothetical particle faciation ratio that is formed by the spheroidal particle of homogeneous, if both particle diameter total lengths are identical, the diameter that claims this spheroidal particle is the mean grain size of actual population.
According to the electrophoresis showed assembly that first aspect present invention provides, the particle diameter of described microcapsules is the 20-50 micron, and the thickness of described photoelectric medium is the 25-50 micron, for example 30 microns, 36 microns, 38 microns and 40 microns, and preferred 30-40 micron, for example 38 microns.
The electrophoresis showed assembly that provides according to first aspect present invention, suspending liquid in described microcapsules is transparent suspending liquid, particle in described microcapsules is comprised of the first charged particle and some electronegative second charged particles of some positively chargeds, the color inequality of described the first charged particle and described the second charged particle.In addition, the suspending liquid in described microcapsules can be also transparent suspending liquid, and the particle in described microcapsules is comprised of some positively chargeds or electronegative charged particle and uncharged neutral particle, the color inequality of described charged particle and described neutral particle.
In addition, a kind of electrophoretic display device (EPD) that provides according to second aspect present invention, it comprises the electrophoresis showed assembly described in above-mentioned each optimal technical scheme and one or more the second electrode, and described the second electrode is located at and is closed on described photoelectric medium side and relative with described the first electrode.
Electrophoretic display device (EPD) described according to second aspect present invention, described the second electrode is arranged at the upper surface of a substrate, and described display module is fixed in the surface of the described second electrode place side of described substrate by adhesive or laminating operation.
In addition, according to a kind of preparation method who prepares the electrophoresis showed assembly described in above-mentioned each technical scheme that third aspect present invention provides, it comprises the following steps:
Microcapsules, adhesive and water are mixed obtain coating fluid;
Coating fluid is coated on the first transparent electrode, and making the coating fluid drying obtain thickness is photoelectric medium between the 20-50 micron, thereby makes the electrophoresis showed assembly.
According to the preparation method that third aspect present invention provides, the weight ratio of described adhesive and described microcapsules is 5%-70%, preferred 10%-60%, 20%-40% for example, for example 30%.
The preparation method that the 3rd invention provides according to the present invention, the particle diameter of described microcapsules is the 10-80 micron, the thickness of described photoelectric medium is between the 20-60 micron, preferred 30-45 micron, for example 36 microns, 38 microns and 40 microns.Perhaps, the diameter of described microcapsules is the 20-50 micron, and the thickness of described photoelectric medium is the 25-50 micron, preferred 30-45 micron, for example 36 microns, 38 microns and 40 microns.
The preparation method that the 3rd invention provides according to the present invention, described adhesive is water-soluble high-molecular compound, the compound substance that described water-soluble high-molecular compound is selected from methylcellulose, hydroxyethyl cellulose, hydroxypropyl methylcellulose, CMS, Arabic gum, gelatin, soybean protein, polyvinyl alcohol (PVA), polyglycol and is comprised of above-mentioned two or more material.
According to the preparation method that third aspect present invention provides, described coating fluid is that described microcapsules, adhesive and water were formed to stir under the stirring rate of 200-300rpm in 0.5-2 hour, preferred 0.5-1.5 hour, and for example 1 hour.Preferably, the dispersed system viscosity of described coating fluid is 70-200cps, preferred 100-150cps.
In addition, the preparation method of a kind of electrophoretic display device (EPD) that fourth aspect present invention also provides comprises following steps:
The ratio that is 1:8 according to weight ratio takes adhesive and water, and after adhesive was dissolved in the water, adding weight ratio was that 15 microcapsules carry out mix and blend with the stirring rate of 200-300rpm and made coating fluid in 1 hour;
The viscosity of controlling above-mentioned coating fluid is 70-200cp, then coating fluid is coated on the first electrode that transparent employing indium oxide material makes, and regulates coating speed take the coating thickness of controlling coating fluid as the 30-40 micron;
Described the first electrode and coating fluid are heating and curing, make the electrophoresis showed assembly;
With the coating fluid place side of described electrophoresis showed assembly by adhesive and the substrate with some second electrodes sticking and, make electrophoretic display device (EPD).
The present invention has also obtained following beneficial effect: the coating difficulty that the arrangement of bilayered microcapsule has not only avoided existing individual layer microcapsules to exist, and the shortcoming such as yields is low, and photoelectric properties are poor, and improved the effective display area of electrophoretic display device (EPD).In addition, this bilayer arrangement has also avoided photoelectric medium blocked up, acts on the low shortcoming of electric field intensity on photoelectric medium.
Description of drawings
Below in conjunction with accompanying drawing, the specific embodiment of the present invention is described in further detail, wherein:
Fig. 1 is the cross-sectional view of existing electrophoretic display device (EPD), and the microcapsules in the photoelectric medium in figure are the individual layer arrangement, and microcapsules are flat pattern;
Fig. 2 is the picture of electrophoretic display device (EPD) in SEM with individual layer microcapsules arrangement, can find out the arrangement of the individual layer microcapsules of this electrophoresis showed assembly;
Fig. 3 is the picture of electrophoretic display device (EPD) in biological microscope of Fig. 2, can find out inevitably to have a large amount of gaps between microcapsules, has reduced the effective display area of electrophoretic display device (EPD);
Fig. 4 is the structural representation of the electrophoresis showed assembly with bilayered microcapsule arrangement of the embodiment of the present invention 1;
Fig. 5 is the structural representation of microcapsules in Fig. 4;
Fig. 6 is the structural representation of the electrophoretic display device (EPD) with bilayered microcapsule arrangement of the embodiment of the present invention 2;
Fig. 7 is the picture of section in SEM of the electrophoretic display device (EPD) in Fig. 6, although local reason due to the microcapsules volume, cause some regional area that one microcapsule is only arranged, some regional area has the arrangement of multilayer microcapsules, but is the arrangement with two microcapsules substantially;
Fig. 8 is the picture of Fig. 6 of the present invention in biological microscope, can find out that the arrangement with bilayered microcapsule makes the gap between microcapsules very little, thereby improve the effective display area of electrophoretic display device (EPD).
In figure:
| 10 | The |
20 | |
| 21 | |
211 | Charged |
| 212 | |
213 | Suspending |
| 22 | Adhesive | 30 | The second electrode |
Embodiment
Further illustrate the present invention below by object lesson, still, should be understood to, these examples are only used for the use that specifically describes more in detail, and should not be construed as for limiting in any form the present invention.
Embodiment 1
Figure 4 shows that a kind of diagrammatic cross-section of electrophoresis showed assembly.Electrophoresis showed assembly in Fig. 3 comprises the first transparent electrode 10, and the photoelectric medium 20 that is attached to described the first electrode 10 sides.Described photoelectric medium 20 has microcapsules 21 and adhesive 22, by adhesive 22, microcapsules 21 is fixed and is adhered on the first electrode 10.Wherein, the first electrode 10 is preferred by indium oxide (ITO), SnO
2, or the transparent conductive film of ZnO/A1 implement.
As can be seen from Figure 4, described microcapsules 21 are flat shape, and its ratio of width to height is greater than 1.2.Because the deformation extent of microcapsules 21 differs, the ratio of width to height also might appear greater than 1.5, perhaps greater than 1.75 microcapsules 21.Although the particle diameter of some microcapsules is less or be deformed into elongated structure filling among the gap between other microcapsules, can find out that roughly most of microcapsules 21 shrink the flat pattern in formation figure under the effect of self gravitation or other extraneous mechanical forces or adhesive 22.
In addition on the one hand, it can also be seen that from Fig. 3, microcapsules 21 are being two-layer arrangement in photoelectric medium 20, wherein one deck closes on the side (being called " upper strata ") of the first electrode 10, and one deck microcapsules 21(of nestling up the upper strata is called " lower floor " in addition).In general, microcapsules 21 can be coated on the first electrode 10 by adhesive 22 and implement.Therefore, the microcapsules 21 in the photoelectric medium 20 in the present embodiment can pass through adhesive 22, and the adhesive 22 after especially solidifying glues firmly and is in the same place.
Figure 5 shows that the structural representation of microcapsules 21.Microcapsules 21 internal package shown in figure transparent suspending liquid 213 and particle, the component structure of describing in suspending liquid 213 wherein and particle such as Chinese patent CN101738814A: suspending liquid 213 is the dispersion solvent of low polarity, for example arene or halo class material; Particle is divided into two types: a kind of is positively charged or electronegative charged particle 211, and this charged particle 211 can be with moving in suspending liquid 213 along direction of an electric field under the effect of external electrical field; Another is uncharged neutral particle 212.Described " not charged " be not be defined as fully not charged, only refer to that the current potential on neutral particle 212 is lower, do not move or substantially do not move under the effect of extra electric field (can impel the electric field of charged particle 211 migrations), namely with respect to the migration rate of charged particle 211, the migration rate of this neutral particle 212 is very slow, even negligible degree.Following experimental group 1-4 namely adopts the microcapsules 21 of the type to test.
Nonetheless, the material of microcapsules 21 interior parcels also can also have other form, disclosed electrophoresis liquid in Chinese patent CN101542383B for example, but solvent and have different optical character and be dispersed in first, second, third dispersed particle in described solvent wherein, but the first dispersed particle is not charged, but the second dispersed particle positively charged, but the 3rd dispersed particle is electronegative.In addition, the material of microcapsules 21 interior parcels can also be that a kind of suspending liquid 213 of describing in US Patent No. 3612758 is coloured suspending liquid 213, and particle is that the particle of single charged type forms.In addition, the material of microcapsules 21 interior parcels also can also comprise transparent suspending liquid, particle in described microcapsules is comprised of the first charged particle and some electronegative second charged particles of some positively chargeds, the color inequality of described the first charged particle and described the second charged particle.
Owing to having comprised a large amount of microcapsules 21 in photoelectric medium 20, and therefore microcapsules 21 particle diameters unlikely operate to control microcapsules 21 to each microcapsules 21 separately and form above-mentioned double-deck arrangements generally at the 0.1-100 micron.Therefore, the present invention can be by controlling the thickness of photoelectric medium 20 and the particle diameter of microcapsules 21, thereby obtain being roughly the electrophoresis showed assembly of the arrangement of two microcapsules 21.
The below is described the preparation method that this has the photoelectric subassembly of bilayered microcapsule 21 arrangements, according to the microcapsules 21 of different-grain diameter scope and the thickness of photoelectric medium 20, obtains the electrophoresis showed assembly of corresponding four groups of experimental group.
Experimental group 1
In the present embodiment, be that the screen cloth filtering diameter of 80 microns is excessive at the microcapsules 21(more than 80 microns with the microcapsules 21 produced by the aperture), then be that the microcapsules 21(of screen cloth filtering below 10 microns of 10 microns is too small by the aperture), thus the microcapsules 21 that diameter is the 10-80 micron can be obtained.
The above-mentioned particle diameter of weighing is 150g at the microcapsules 21 of 10-80 micron, the 10g gelatin is dissolved in 80g water, add in microcapsules 21 after will the good gelatin solution of dissolving filtering, carrying out mix and blend with the stirring rate of 200-300rpm, to make viscosity after 1 hour be coating fluid at 70-250cp microcapsules 21 dispersion liquids.
Then utilize the coating instrument that above-mentioned coating fluid is coated on the first electrode 10, regulate the thickness of the coating speed control photoelectric medium that is coated with instrument between the 20-60 micron, through being heating and curing, make the compact arranged electrophoresis showed assembly of bilayered microcapsule 21.
Experimental group 2
The difference of preparation process and experimental group 1 is, the thickness of controlling photoelectric medium is the 30-50 micron, obtains having the electrophoresis showed assembly of double-deck arrangement.Figure 7 shows that the diagrammatic cross-section of observing electrophoretic display device (EPD) corresponding to the electrophoresis showed assembly that makes by SEM, can find out, the reason that differs due to microcapsules 21 volumes, the situation that occurs only having a microcapsule 21 although may there be the microcapsules 21 of some large particle diameters in some some areas, also might there be in some local area the phenomenon of microcapsules 21 accumulations of many small particle diameter, for example the microcapsules 21 by three small particle diameter are deposited in the arrangement that forms together three microcapsules 21, also might appear at some regional areas and arrangement by the microcapsules 21 of a large particle diameter only occur, but on the whole, it is the arrangement (being on average namely the arrangement of two microcapsules 21) of two microcapsules 21 substantially that the photoelectric medium 20 of this thickness has formed.
Figure 8 shows that the electrophoresis showed assembly with this structure is positioned over observable picture under biological microscope (identical with the enlargement factor of Fig. 3).Apparent, with respect to the gap between microcapsules in Fig. 3 21, the gap between the electrophoresis showed assembly with bilayered microcapsule 21 arrangements shown in Figure 8 is less, and effective display area is larger.
Experimental group 3
Preparation process and experimental group 1 are basic identical, and its difference is, the particle diameter of the microcapsules 21 of choosing is the 20-50 micron, and the thickness of controlling the photoelectric medium 20 of coating is the 25-50 micron, obtains having the electrophoresis showed assembly of double-deck arrangement.
Experimental group 4
Preparation process and experimental group 1 are basic identical, and its difference is, the particle diameter of the microcapsules 21 of choosing is the 20-50 micron, and the thickness of controlling the photoelectric medium 20 of coating is the 30-45 micron, obtains having the electrophoresis showed assembly of double-deck arrangement.
Reference group
Preparation process and experimental group 1 are basic identical, and its difference is, the particle diameter of the microcapsules 21 of choosing is the 50-100 micron, and the thickness of controlling the photoelectric medium 20 of coating is the 15-20 micron, obtains having the electrophoresis showed assembly of individual layer arrangement.
Embodiment 2
Figure 5 shows that the electrophoretic display device (EPD) of the electrophoresis showed establishment of component that utilizes structure in embodiment 1, electrophoresis showed assembly and the second electrode 30 discussed in embodiment 1, described the second electrode 30 is located at and is closed on described photoelectric medium 20 sides and relative with described the first electrode 10.In the present embodiment, described the second electrode 30 is arranged at the upper surface of a substrate, and described display module is fixed in the upper surface of described substrate by adhesive 22 or laminating operation.For the second electrode 30 and substrate, the preferred thin film transistor (TFT) that has switching function and can apply electric field that uses.
Picture quality detects
The researchist makes according to the method in embodiment 2 electrophoretic display device (EPD) that obtains with the electrophoresis showed assembly of experimental group 1-4 and powers up and make the first electrode 10 and the second electrode 30 have a driving voltage, and the black and white reflectivity, contrast etc. of then testing electrophoretic display device (EPD) with spectrophotometer characterize the data of electrophoretic display device (EPD) picture quality.Simultaneously, the display quality of the electrophoretic display device (EPD) that the electrophoresis showed assembly of said method detection reference group is corresponding obtains data as shown in the table.
Annotate: 1.L* numerical value has embodied the reflective light intensity that shows film, and the L* value is higher just means that reflectivity is stronger.
2.R numerical value has embodied the reflectivity values that shows film, R=((L*+16)/116) 3*100%
Contrast=R white/R is black
Also can find out from upper table, has the contrast of electrophoresis showed assembly (experimental group 1-4) of bilayered microcapsule arrangement all more than 12, and the contrast of reference group 1 is only 10.17, therefore, the electrophoresis showed assembly or the electrophoretic display device (EPD) that substantially have a bilayered microcapsule arrangement have more good display performance (reference group 1).
The above has done detailed description to embodiments of the present invention by reference to the accompanying drawings, but the present invention is not limited to above-mentioned embodiment, in the ken that one skilled in the relevant art possesses, can also make various variations under the prerequisite that does not break away from aim of the present invention.
Claims (13)
1. an electrophoresis showed assembly, comprise the first transparent electrode, and the photoelectric medium that is attached to described the first electrode side; Described photoelectric medium has microcapsules and adhesive, and described microcapsules are scattered among described adhesive and by described adhesive to be fixed; Include suspending liquid and the polytype particle that is dispersed in described suspending liquid in described microcapsules, the particle of every type has some, wherein have at least the particle of a type to move under the effect of electric field, it is characterized in that, the microcapsules in described photoelectric medium are roughly two-layer arrangement.
2. electrophoresis showed assembly as claimed in claim 1, is characterized in that, described microcapsules are flat shape.
3. electrophoresis showed assembly as claimed in claim 1 or 2, is characterized in that, the particle diameter of described microcapsules is the 10-80 micron, and the thickness of described photoelectric medium is between the 20-60 micron, preferred 30-50 micron.
4. electrophoresis showed assembly as described in claim 1-3 any one, is characterized in that, the diameter of described microcapsules is the 20-50 micron, and the thickness of described photoelectric medium is the 25-50 micron, preferred 30-45 micron.
5. electrophoresis showed assembly as claimed in claim 1, it is characterized in that, suspending liquid in described microcapsules is transparent suspending liquid, particle in described microcapsules is comprised of the first charged particle and some electronegative second charged particles of some positively chargeds, the color inequality of described the first charged particle and described the second charged particle.
6. electrophoresis showed assembly as claimed in claim 1, it is characterized in that, suspending liquid in described microcapsules is transparent suspending liquid, particle in described microcapsules is comprised of some positively chargeds or electronegative charged particle and uncharged neutral particle, the color inequality of described charged particle and described neutral particle.
7. an electrophoretic display device (EPD), is characterized in that, comprises electrophoresis showed assembly as described in claim 1 to 6 any one and one or more the second electrode, and described the second electrode is located at and is closed on described photoelectric medium side and relative with described the first electrode.
8. electrophoretic display device (EPD) as claimed in claim 7, is characterized in that, described the second electrode is arranged at the upper surface of a substrate, and described display module is fixed in the surface of the described second electrode place side of described substrate by adhesive or laminating operation.
9. a preparation method who prepares as the described electrophoresis showed assembly of claim 1-6 any one, is characterized in that, comprises the following steps:
Microcapsules, adhesive are mixed obtain coating fluid;
Coating fluid is coated on the first transparent electrode, and making the coating fluid drying obtain thickness is photoelectric medium between the 20-60 micron, thereby makes the electrophoresis showed assembly.
10. preparation method as claimed in claim 9, is characterized in that, the weight ratio of described adhesive and described microcapsules is 5%-70%, preferred 10%-60%, 20%-40% for example, for example 30%.
11. preparation method as claimed in claim 9 is characterized in that, the particle diameter of described microcapsules is the 10-80 micron, between the thickness 20-60 micron of described photoelectric medium, and preferred 30-45 micron.
12. as the described preparation method of claim 9-11 any one, it is characterized in that, the diameter of described microcapsules is the 20-50 micron, the thickness of described photoelectric medium is the 25-50 micron, preferred 30-45 micron.
13. the preparation method of an electrophoretic display device (EPD) is characterized in that, comprises following steps:
The ratio that is 1:8 according to weight ratio takes adhesive and water, and after adhesive was dissolved in the water, adding weight ratio was that 15 microcapsules carry out mix and blend with the stirring rate of 100-300rpm and made coating fluid in 1 hour;
Then coating fluid is coated on the first electrode that transparent employing indium oxide material makes, regulates coating speed take the coating thickness of controlling coating fluid as the 30-40 micron;
Described the first electrode and coating fluid are heating and curing, make the electrophoresis showed assembly;
With the coating fluid place side of described electrophoresis showed assembly by adhesive and the substrate with some second electrodes sticking and, make electrophoretic display device (EPD).
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