CN101158795A - Improved electrophoretic display and preparation method thereof - Google Patents
Improved electrophoretic display and preparation method thereof Download PDFInfo
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- CN101158795A CN101158795A CNA2007101776880A CN200710177688A CN101158795A CN 101158795 A CN101158795 A CN 101158795A CN A2007101776880 A CNA2007101776880 A CN A2007101776880A CN 200710177688 A CN200710177688 A CN 200710177688A CN 101158795 A CN101158795 A CN 101158795A
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Abstract
The invention relates to an improved electrophoretic display and a manufacturing method, two transparent electrophoretic layers with special electrical performance are added to the display elements to form the electrophoretic display, which can achieve rapid display state switch and better display stability and long display maintain capability, particularly after multi-layers of electrophoretic display elements are superposed, two additional transparent electrophoretic layers with special electrical performance can not only achieve rapid display state switch and better display stability and long display maintain capability, but also has the performances of improving contrast, switching performance, the reflectivity and structure integrality in the minimum optical density state. At the same time the invention also provides the electrophoretic display manufacturing method.
Description
Technical field
The present invention relates to improve the electrophoretic display device (EPD) of contrast, performance of handoffs, exhibit stabilization, the reflectivity under the minimum light density state and structural intergrity, and relate to its preparation method.
Background technology
Electrophoretic display device (EPD) is based on the non-emanative device that the electrophoresis that is suspended in the charged pigment particles in the solvent is made, and proposes first in 1969.This class display comprises the two boards with electrode usually, and this two boards is disposed opposite to each other and with plastic lining bedding and padding (spacer).Usually, an electrode plate wherein is transparent, between two electrode plate, is sealing suspending liquid.This suspending liquid comprises the painted solvent and the particulate of electrically charged pigment.When applying voltage difference between two electrodes, pigment particle will be moved to a side, so can see the color of this pigment or the color of this solvent according to the polarity of this voltage difference.
For avoiding undesirable particle migration (for example precipitation), proposition is between two electrodes between dividing regions, with spatial division is that littler unit is (referring to M.A.Hopper and V.Novotny, the electric bundling of Institute of Electrical and Electric Engineers collection of thesis (IEEE Trans.Dev.), volume ED26, No.8, pp.1148-1152 (1979)).Yet, under the situation of partition type electrophoretic display device (EPD), can have some difficulties: the formation of subregion, the method for sealing suspending liquid.In addition, in the partition type electrophoretic display device (EPD), the suspending liquid of maintenance different colours is disconnected from each other also to be difficult.
Another kind of type of electrical phoretic display (seeing United States Patent (USP) No. 3612758) has electrophoresis cartridge, and these boxes are to be formed by parallel wire casing (groove or groove).Filling and the sealing of electrophoresis liquid in groove is to finish by batch process.In addition, undesirable particle migration or precipitation particularly longitudinally, remain the problem that needs solution.
Thereafter, people attempt suspending liquid is encapsulated in the microcapsules.United States Patent (USP) has been described the electrophoretic display device (EPD) of microencapsulation for No. 5961804, No. 5930026, No. 6017584.This electrophoretic display device (EPD) has the microcapsules arrangement of two dimension basically, and wherein microcapsules contain the electrophoresis component of being made up of the suspending liquid (visually with the dielectric solvent contrast) of dielectric liquid and charged pigment particles.These microcapsules can form by interfacial polymerization, in-situ polymerization or other method of knowing (as solidifying or single/complex coacervation in physical method, the liquid).These microcapsules after it forms, can inject the box between two isolated electrodes, or " printing " in or coat on the transparent conducting film.These microcapsules can be fixed within the transparent matrix or bonding agent, himself are to be clipped between two electrodes.
Disclosed a kind of improved electrophoretic display device (EPD) manufacturing technology in U.S. Patent application No.09518488,09759212,09606654,09784972, all these are hereby expressly incorporated by reference document.This improved electrophoretic display device (EPD) comprises the box of isolation, the miniature cup of shape, size and the aspect ratio of definition is prepared from the box of these isolation by having clearly, and fills with the electrically charged pigment or the pigment particle that are scattered in dielectric solvent, preferred fluorinated solvent or the solvent mixture.With the box of the independent sealing of polymeric seal layer through filling.Preferably with comprising that a kind of preparation of compositions of material forms, described material is selected from the group of being made up of thermoplastics, thermoplastic elastomer, thermosetting plastics and their precursor to the sealing layer.
This little cup structure mode can be with multi-sizeization make electrophoretic display device (EPD) with effective roll-to-roll continuous production processes.This electrophoretic display device (EPD) can be made the online continuously of conducting film (as ITO/PET).
In order to improve the contrast of this class display, adopt following method usually: (1) utilizes the deepening background, and reducing the light leak by non-activity (invalid) partition wall, or (2) utilize the miniature cup of wideer opening or narrower partition wall, with the increase service load.Yet the deepening background causes having lower reflectivity in the minimum light density state usually.On the other hand, the display box made from wideer miniature cup or narrower partition wall tends to compression or/and shearing force has relatively poor incompressible and/or shearing force.It is very expensive that yet this class has the manufacturing of miniature cup of basic structure, and the more important thing is that the coordination between the reflectivity under contrast and the minimum light density state does not still solve.
Disclose in application number is 03109593.3 Chinese patent application " electrophoretic display device (EPD) of improvement and preparation method thereof " the multilayer display box is carried out the preparation method of stacked package and the electrophoretic display device (EPD) that designs, this method has improved contrast, performance of handoffs, the reflectivity under the minimum light density state of display.
But above-mentioned all methods all do not solve the optical stability of electrophoretic display device (EPD).After promptly disconnecting power supply, the time that displaying contents is kept is short.Too short because if hold time, need constantly on electrode, to apply scanning voltage to refresh displaying contents, this is unfavorable for the energy-conservation of display.Particularly the application in Electronic Paper, e-book etc. is restricted especially.
Summary of the invention
The present invention relates to novel multilayer electrophoresis display structure, it has shown contrast, performance of handoffs, exhibit stabilization, the reflectivity under the minimum light density state and the structural intergrity of improvement.In this multilayer electrophoretic display device (EPD), can use more shallow miniature cup, obtaining acceptable contrast, and under the minimum density state, have the reflectivity of improvement, significantly improve optical stability simultaneously.
For achieving the above object, the technical solution of the present invention's proposition is as follows:
1, electrophoretic display device (EPD) comprises:
One or more layers of display element layer;
Additional ground floor;
The additional second layer;
Described display element layer is laminated between the additional ground floor and the additional second layer;
Described additional ground floor has identical charge polarity with the additional second layer;
Preferential scheme is that the particulate that has negative charge that comprises in each unit box in the additional ground floor and the additional second layer equates substantially or amount of charge is equal substantially at least.
The described additional ground floor and the additional second layer have the opposite charge polarity of electrophoresis liquid of filling with display element layer;
Described display element layer, additional ground floor, the additional second layer form rhythmo structure.
2, a kind of scheme is that described display element layer is a kind of miniature cup array, and each described miniature cup comprises:
Partition wall;
Be filled in electrophoresis composition wherein; And
Polymeric seal layer, described polymeric seal layer are to be formed by the sealing compositions that proportion is lower than described electrophoresis composition, and adhere to hermetically on the described partition wall, so that the electrophoresis composition is sealed in each miniature cup.
First aspect relates to electrophoretic display device (EPD), and the two-layer or more multi-layered display element that is stacked together is filled with electrophoresis disclosing solution and sealing separately.
Second aspect relates to electrophoretic display device (EPD), and the two-layer or more multi-layered display element that is stacked together is filled the electrophoresis disclosing solution with different colours, optical density or switching rate.
The 3rd aspect relates to electrophoretic display device (EPD), and the two-layer or more multi-layered display element that is stacked together has the ratio of different shapes, size or aperture area and the total area.
The 4th aspect relates to electrophoretic display device (EPD), the two-layer or more multi-layered display element that is stacked together, in stacking, the non-movable separated region of one deck at least in part with last layer or following effective display element region overlapping of one deck, preferably be overlapping fully.Term " interlocks " and will be used for describing this arrangement in whole application form.This being staggered is necessary, with allow by the upper strata separated region can see color from lower floor's display element (by reflection of light or absorb produced).
The 5th aspect relates to electrophoretic display device (EPD), two-layer or the more multi-layered display element that is stacked together, every layer of display element that comprises filling with electrophoresis liquid in stacking, and electrophoresis liquid comprises and is scattered in the Chinese white in black solvent or the solvent mixture or contains pigment particle.
The 6th aspect relates to panchromatic or the multiple colour electrophoretic display, the two-layer display element that is stacked together, the upper strata comprises filling with the redness of electrophoresis disclosing solution, blueness and green display element, and this electrophoresis disclosing solution comprises and is scattered in the Chinese white in redness, blueness and green solvent or the solvent mixture respectively or contains pigment particle.
The 7th aspect relates to panchromatic or many electrophoretic display device (EPD)s, the two-layer display element that is stacked together, and lower floor comprises the display element of filling with electrophoresis liquid, and wherein electrophoresis liquid comprises and is scattered in the Chinese white in black solvent or the solvent mixture or contains pigment particle.And this black display element is placed in the non-zone of action on upper strata with interlace mode.
The 8th aspect relates to panchromatic or the multiple colour electrophoretic display, the two-layer display element that is stacked together, lower floor comprises the display element of filling with redness, blueness, green and the black of electrophoresis disclosing solution, and this electrophoresis disclosing solution comprises and is scattered in the Chinese white in redness, blueness, green and black solvent or the solvent mixture respectively or contains pigment particle.Top layer comprises filling with the redness of electrophoresis disclosing solution, blueness and green display element, and this electrophoresis disclosing solution comprises and is scattered in the Chinese white in redness, blueness and green solvent or the solvent mixture respectively or contains pigment particle.Two-layer painted display element and non-movable separated region are to arrange in staggered mode, wherein the non-movable separated region of the black display element alignment top layer of bottom.
In the multilayer electrophoretic display device (EPD), above the top of indication (or on) layer is normally watched side, and the end (or down) layer is the non-side of watching.
3, a kind of scheme is that described additional ground floor, the additional second layer are a kind of miniature cup arrays, and each described miniature cup comprises:
Partition wall;
Be filled in transparent electrophoresis composition wherein; And
Polymeric seal layer, described polymeric seal layer are to be formed by the sealing compositions that proportion is lower than described electrophoresis composition, and adhere to hermetically on the described partition wall, so that the electrophoresis composition is sealed in each miniature cup.
4, another kind of scheme is that described display element layer comprises electrophoretic medium, and described electrophoretic medium comprises the discrete droplets of a plurality of electrophoretic mediums in polymer adhesive, and each droplet comprises a plurality of charged particles, and described charged particle is dispersed in the suspending liquid.
5, another kind of scheme is that described additional ground floor, the additional second layer comprise electrophoretic medium, described electrophoretic medium comprises the discrete droplets of a plurality of transparent electrophoretic mediums in polymer adhesive, each droplet comprises a plurality of charged particles, and described charged particle is dispersed in the suspending liquid.
6, make the method for the electrophoretic display device (EPD) of display board, comprising with extra play:
A) prepare one or more layers display element layer respectively;
B) preparation adds the ground floor and the additional second layer respectively;
C) with adhesive phase described one deck display element layer is laminated to another layer display element layer alternatively;
D) described additional ground floor is laminated on the face of multilayer display element layer of described one deck display element layer or lamination with adhesive phase alternatively;
E) the described additional second layer is laminated on another face of multilayer display element layer of described one deck display element layer or lamination with adhesive phase alternatively.
7, make the method for the electrophoretic display device (EPD) of display board, comprising with extra play:
A) on conducting film, form additional ground floor;
B) shifting formation ground floor display element layer on the abscission layer;
C) described ground floor display element layer is laminated to described additional ground floor and removes described transfer abscission layer;
D) on the transfer abscission layer, form more display element layer alternatively respectively;
E) described more display element layer is laminated to the top layer that stacks layer that has formed and removes described transfer abscission layer;
F) shifting the additional second layer of formation on the abscission layer;
G) the described additional second layer is laminated to the top layer that stacks layer that has formed and removes described transfer abscission layer;
I) second conductive film layer is pressed on the described the superiors that stack layer.
Described display element layer is aforesaid display element layer;
The described additional ground floor and the additional second layer are the aforesaid additional ground floor and the additional second layer.
The display box that display element among the present invention, its implication are extensively contained partition type display box, microgroove or microflute type display box (No. the 3612758th, United States Patent (USP)), microcapsule-type display box (United States Patent (USP) No. 5961804, No. 5930026, No. 6017584) and made according to the miniature cup technology described in WO01/67170.
Beneficial effect of the present invention can be found out from above-mentioned realization, adopts the present invention can significantly improve contrast, performance of handoffs, exhibit stabilization, the reflectivity under the minimum light density state and the structural intergrity of electrophoretic display device (EPD).In this multilayer electrophoretic display device (EPD), can use more shallow miniature cup, obtaining acceptable contrast, and under the minimum density state, have the reflectivity of improvement, significantly improve optical stability simultaneously.
Description of drawings:
Fig. 1 represents wherein have the deepening background to improve contrast with the typical electrophoresis showed box of existing miniature cup technology preparation.At " ON " and " OFF " (maximal density) state.The beholder will see background colour by non-movable separated region.Obtained to have display than antiradar reflectivity in the minimum light density state.
Fig. 2 a and Fig. 2 b represent respectively with " ON " of the two-layer electrophoretic display device (EPD) of existing technology (minimum light density) and " OFF " (maximal density) state.In the minimum light density state, two-layer white particles all will attracted to the top of miniature cup.The non-zone of action on upper strata will present white, because light is reflected back by the white particles in the miniature cup layer of bottom.In contrast, at the maximum optical density state, two-layer white particles all attracted to the bottom of miniature cup, and the non-movable separated region on upper strata will present colour, because light is absorbed by the colorant in the miniature cup layer of bottom.
Fig. 3 a and Fig. 3 b represent to have the method for the electrophoretic display device (EPD) of two-layer or more multi-layered display box with existing technology manufacturing.Fig. 3 a represents to prepare by two miniature cup layers of lamination the method for two-layer electrophoretic display device (EPD), and wherein the sealed sides of miniature cup faces one another.Fig. 3 b represents to prepare the another kind of method of two-layer electrophoretic display device (EPD), by (i) miniature cup is transferred on second miniature cup layer on the conducting film and is (ii) used bonding agent alternatively from the demoulding substrate, and the composite film that generates is pressed on the conducting film.Method (i) can repeat to prepare the electrophoretic display device (EPD) of two-layer above display box.
Fig. 4 a and Fig. 4 b represent the two-layer color electrophoretic display with existing technology, and wherein top layer comprises the miniature cup of filling with red, green and blue electrophoresis liquid, and bottom comprises the miniature cup of filling with the black electrophoresis liquid.
Fig. 5 a and Fig. 5 b represent the two-layer full color electrophoretic display with existing technology, and wherein top layer comprises the miniature cup of filling with red, green and blue electrophoresis liquid, and bottom comprises the miniature cup of filling with red, green, blue and black electrophoresis liquid.The redness on upper strata, green, blueness and non-movable separated region overlap redness, green, blueness and the black miniature cup that is aligned in lower floor respectively.
Fig. 6 has provided the electrophoretic display device (EPD) that adopts technology of the present invention to form three-decker at the two-layer transparent extra play of individual layer electrophoretic display device (EPD) box lamination.Under two kinds of optical states (Fig. 6 a and Fig. 6 b), because the existence of extra play makes every kind of optical states become more stable.
Fig. 7 has provided the electrophoretic display device (EPD) that adopts technology of the present invention to form four-layer structure at the two-layer transparent extra play of double-deck electrophoretic display device (EPD) box lamination.In the minimum light density state, two-layer white particles all will attracted to the top of miniature cup.The non-zone of action on upper strata will present white, because light is reflected back by the white particles in the miniature cup layer of bottom.In contrast, at the maximum optical density state, two-layer white particles all attracted to the bottom of miniature cup, and the non-movable separated region on upper strata will present colour, because light is absorbed by the colorant in the miniature cup layer of bottom.Simultaneously under two kinds of optical states (Fig. 7 a and Fig. 7 b), because the existence of extra play makes every kind of optical states become more stable.
Fig. 8 a, 8b and 8e represent to adopt the method for making the electrophoretic display device (EPD) of the single or multiple lift display element with extra play in the technology of the present invention.Fig. 8 a represents the method (comprising single layered display element) by two extra plays of lamination and three layers of electrophoretic display device (EPD) of a display element layer preparation.Fig. 8 b represents the method (comprising double-deck display element) by two extra plays of lamination and four layers of electrophoretic display device (EPD) of two display element layer preparations.Fig. 3 c represents to prepare the another kind of method (comprising single layered display element) of three layers of electrophoretic display device (EPD).
Fig. 9 a and 9b represent to adopt technology of the present invention to have the two-layer display element layer color electrophoretic display of extra play.
Figure 10 a and 10b represent to adopt technology of the present invention to have the two-layer display element layer full color electrophoretic display of extra play.
Embodiment:
The term explanation:
" miniature cup ": refer to by little mold pressing or cup-shaped recess that graph exposure generated, have according to the special parameter of certain manufacture method predetermined have clear and definite shape, size and an aspect ratio.
" aspect ratio " is vocabulary general in the electrophoretic display device (EPD) field, and the degree of depth that is meant box for miniature cup is to width or the degree of depth ratio to length.
The maximum optical density that " maximum optical density (Dmax) " expression display can reach.
" minimum light density (Dmin) " is meant the minimum light density of display background.
" contrast " is defined as the ratio of the reflection percentage of display under the reflection percentage of the electrophoretic display device (EPD) under the minimum light density state and the maximum optical density state.
" display element ": have the elementary cell of optics performance of handoffs, as the display box of using the miniature cup manufacturing technology, the microcapsules of using the microcapsules encapsulation technology etc.
Quoting of prior art:
Based on " miniature cup " electrophoresis showed box or be called the manufacture method and the manufacturing process of electrophoretic display device, be that 01801449.6 Chinese patent application " is made the method for electrophoretic display device (EPD) " at number of patent application, number of patent application is that 200410032752.2 Chinese patent application " is used to make the method for multiple colour electrophoretic display ", number of patent application is 200480004813.2 Chinese patent application " electrophoretic display device (EPD) and manufacture method thereof ", number of patent application is to have in 200580014903.4 Chinese patent application " manufacturing process of the electrophoretic display device (EPD) " open file clearly to describe.Quote as public technology in the present invention, be used to make the method for display element layer described in the invention, additional ground floor and the additional second layer.Way of reference is for quoting in full.
Among the present invention, also relate to based on the display element layer among electrophoretic medium manufacturing the present invention of microcapsules encapsulation technology, additional ground floor and the additional second layer.In number of patent application is 200480036461.9 Chinese patent application " electrophoretic medium ", number of patent application is 200480018383.X Chinese patent application " electrophoretic display device (EPD) ", number of patent application are 02807863.2 Chinese patent application " electrophoretic medium with picture steadiness of improvement " open file, have clearly and describe.Way of reference is for quoting in full.Being used for when of the present invention, is to be used for when of the present invention with difference in the incorporated, and a band point particle is single charge polarity in microcapsules, and is that microcapsules have two kinds of different charged particles of polarity different optical characteristic in the original text.The personnel of association area are appreciated that such change is very little for technology and manufacture method influence, can produce the microcapsules that have only the unipolarity charged particle and the display element layer that is made of microcapsules, additional ground floor and the additional second layer fully with disclosed technology in these patented claims.
Also use in the present invention multilayer electrophoresis showed layer, additional ground floor, additional second layer preparation technology and method laminated together.In number of patent application is 03109593.3 Chinese patent application " electrophoretic display device (EPD) of improvement and preparation method thereof " open file, have clearly to describe the multilayer electrophoresis showed is pressed together layer by layer the contrast that improves electrophoretic display device (EPD), performance of handoffs, the method and the manufacturing process of performance index such as reflectivity under the minimum light density state.Need in the present invention to be applied to similar manufacturing process and method, so quote in full as production technology of the present invention basis.
Emphasis of the present invention is to be that manufacture method further improves described in 03109593.3 the Chinese patent application " electrophoretic display device (EPD) of improvement and preparation method thereof " for number of patent application, with the picture steadiness of further raising electrophoretic display device (EPD).Original technology is that multilayer electrophoresis showed layer is carried out lamination, thereby solves that the contrast that the miniature cup separated region produces descends, the low problem of reflectivity under the minimum light density state.Further in the process of lamination, increase by two special extra plays among the present invention, have and the opposite polarity charged particle of electrophoresis showed layer charge, make extra play adopt material transparent to make simultaneously.By such improvement, utilize the electrology characteristic that the opposed polarity electric charge attracts each other, the identical polar electric charge repels mutually, improved the picture steadiness of electrophoretic display device (EPD) and performance of handoffs faster greatly.
Here said " transparent " is meant the light refraction for certain wavelength coverage, seldom absorbs and reflects.In number of patent application is 200480036461.9 Chinese patent application " electrophoretic medium ", introduce partially transparent electrophoretic medium material, in number of patent application is 03804137.5 Chinese patent application " electrophoretic display device, EDD ", introduced transparent membrane, transparent electrophoretic medium, transparent charged particulate material.The present invention directly quotes.
Quoting above-mentioned these patent application documents is to be used for illustrating that the used display element layer of manufacturing the present invention, certain optically transparent additional ground floor of wavelength coverage, the material that adds the second layer and manufacture method and manufacturing process are feasible.
Fig. 1 comprises two battery lead plates 110,111 with the electrophoretic display device (EPD) box that existing miniature cup technology prepares, and one of them is transparent, as the electrode in this example 110, and is encapsulated in two one deck boxes 112 between the electrode.These are box filled to be scattered in the electrically charged pigment in the colored dielectric solvent or to contain pigment particle and use sealant 113 sealings.The sealing layer spreads all over partition wall 116 and forms continuous layer thereon.To be pressed on layer by layer on the conducting film 110 through the box of sealing with adhesive phase 114 alternatively.When applying voltage between two electrodes, charged particulate migration is to a side, thereby can see the color of this pigment or change the color of solvent by nesa coating 110.Because do not have any light scattering particulate at separated region 116, under two kinds of optical states, observing the color that can see background by this separated region, cause the contradiction between the reflectivity under the contrast of electrophoretic display device (EPD) and the minimum light density.
Fig. 2 has provided with the electrophoretic display device (EPD) of existing technology with two-layer electrophoretic display device (EPD) box lamination formation alternately double-layer structure.Shown in Fig. 2 a and 2b, then there is not the coordination problem between the reflectivity under contrast and the minimum light density.In these two figure, display has upper box layer 221 and lower box layer 22.Two-layer is to seal separately with sealant 223.This is two-layer arranges and the sealed sides of both sides faces one another in staggered mode.This double-layer structure is to be clipped between top transparent conducting film 224 and the bottom conductive film 225.(Fig. 2 a) attracted to the top of box in the white particles of the upper and lower at " ON " state.The separated region 226 of top layer will present " white ".On the contrary, at " OFF " state (Fig. 2 b), all attracted to the bottom of box in the white particles of the upper and lower.The separated region 226 of top layer will present " colour " of painted solvent.
About the preparation of the sealing of the preparation of the manufacturing of miniature cup, electrophoresis liquid, miniature cup, individual layer electrophoretic display panel, have electrophoresis showed itself and the manufacturing and all material of multilayer electrophoretic display panel, in above-mentioned cited patent applications document, description has been arranged.
Fig. 3 a and 3b represent to make in the prior art two-layer or more multi-layered display box.Fig. 3 a represents to prepare by the top layer 331 of lamination display box and bottom 332 method of two-layer electrophoretic display device (EPD).Display box through filling seals separately with sealant 333.At the conducting film 334 of watching side is transparent, and can be by melanism at the non-conducting film 335 of side of watching., can use bonding agent to promote lamination process.The non-movable separated region 336 of one deck is arranged with interlace mode with effective box district of another floor in top layer 331 and the bottom 332.
Fig. 3 b represents the method for the two-layer electrophoretic display device (EPD) of another kind of preparation.(i) preparation display box layer 332 on conducting film 335; (ii) use step identical in (i), another display box layer 331 of preparation on disengaging type substrate 337; (iii) with bonding agent the display box layer 331 on the disengaging type substrate 337 is laminated on the layer 332 alternatively; (iv) remove disengaging type substrate 337; (v) with bonding agent the composite film that obtains is pressed on the conducting film 334 alternatively.Can repeating step (ii), (iii), (iv) so that had the electrophoretic display device (EPD) of two-layer above display box.
As above-mentioned prepared two-layer or multilayer electrophoretic display device (EPD) in, arrange with interlace mode the non-movable separated region of upper strata miniature cup layer and lower floor miniature cup zone of action is very important, one of at least two conducting films 334,335 are pre-image conversions.In addition, be transparent at the conducting film 334 of watching side at least.
Fig. 4 a and 4b represent the two-layer color electrophoretic display of prior art.Wherein top layer 441 comprises the display box of filling with red, green and blue electrophoresis liquid, and bottom 442 comprises the display box of filling with the black electrophoresis liquid.Display box through filling seals separately with sealant 443.In two figure, the non-zone of action 446 on upper strata 441 is staggered with effective box zone of lower floor 442.This double-layer structure is to be clipped between two conducting films 444,445.One of at least two conducting films are transparent.
Fig. 5 a and 5b represent the two-layer full color electrophoretic display of prior art.Wherein top layer 551 comprises the display box of filling with red, green and blue electrophoresis liquid, and bottom 552 comprises that filling is with display box red, green, blue, the black electrophoresis liquid.Display box through filling seals separately with sealant 553.In two figure, the non-zone of action 556 on upper strata 551 is staggered with effective box zone of lower floor 552.This double-layer structure is to be clipped between two conducting films 554,555.One of at least two conducting films are transparent.
Fig. 6 has provided the electrophoretic display device (EPD) that adopts technology of the present invention to form three-decker at the two-layer transparent extra play of individual layer electrophoretic display device (EPD) box lamination.Shown in Fig. 6 a and 6b, in this example, include the particulate 610 that has negative charge in each unit box of the additional ground floor 609 of increase, include the particulate 611 that has negative charge in each unit box of the additional second layer 612; Preferential scheme is that the particulate that has negative charge that comprises in each unit box in two extra plays equates substantially or amount of charge is equal substantially at least.Charged corpuscle 608 opposite polarity of electrophoretic display device 601 in the polarity of the charged corpuscle of these two extra plays and the display element layer.The upper strata lamination of display element layer adds ground floor, and lower floor's lamination of display element layer adds the second layer.Optionally seal with sealant 603 between layer and the layer.Because the additional ground floor and the additional second layer all are transparent, therefore can not influence the optical characteristics of display layer.This three-decker is to be clipped between top transparent conducting film 604 and the bottom conductive film 605.(Fig. 6 a) at " ON " state, top transparent conducting film 604 adds negative voltage, bottom conductive film 605 adds positive voltage, this moment is under the electric field force effect, the particulate that has negative charge 610 of additional ground floor 609 is pushed to the bottom of additional ground floor, the charged corpuscle 608 of electrophoretic display device 601 attracted to the top of this layer in the display element layer, and the particulate that has negative charge 611 of the additional second layer 612 attracted to the bottom of this layer.If remove the voltage that is added between top transparent conducting film 604 and the bottom conductive film 605 this moment, because the existence of the additional ground floor 609 and the additional second layer 612, the negative charge particulate in the additional ground floor and the positive charge particulate of display element layer continue the certain electric field force of maintenance, and the electronegative particulate of the additional second layer is owing to compare first extra play, farther with the distance of charged corpuscle in the display element layer 601, thereby electric field force is little, make the positive charge particulate of negative charge particulate and display element layer in the additional ground floor continue the certain electrical field attraction of maintenance, even have vibrations or other general interference can not influence this electric field force, thereby improve the optical stability of electrophoretic display device (EPD) effectively.Equally, at " OFF " state (Fig. 6 b), top transparent conducting film 604 adds positive voltage, bottom conductive film 605 adds negative voltage, this moment is under the electric field force effect, the particulate that has negative charge 610 of additional ground floor 609 attracted to the top of additional ground floor, and the charged corpuscle 608 of electrophoretic display device 601 is pushed the bottom that pours into this layer in the display element layer, and the particulate that has negative charge 611 of the additional second layer 612 is pulled to the top of this layer.If remove the voltage that is added between top transparent conducting film 604 and the bottom conductive film 605 this moment, because the existence of the additional ground floor 609 and the additional second layer 612, the negative charge particulate in the additional second layer and the positive charge particulate of display element layer continue the certain electric field force of maintenance, and the electronegative particulate of additional ground floor is owing to compare second extra play, farther with the distance of charged corpuscle in the display element layer 601, thereby electric field force is little, make the positive charge particulate of negative charge particulate and display element layer in the additional second layer continue the certain electrical field attraction of maintenance, even have vibrations or other general interference can not influence this electric field force, thereby improve the optical stability of electrophoretic display device (EPD) effectively.In this single layered display element layer structure,, still there is the problem of the reflectivity contradiction under contrast and the minimum light density state owing to the existence of separated region 606.
Fig. 7 has provided the electrophoretic display device (EPD) that adopts technology of the present invention to form four-layer structure at the two-layer transparent extra play of double-deck electrophoretic display device (EPD) box lamination.Shown in Fig. 7 a and 7b, in this example, include the particulate 710 that has negative charge in each unit box of the additional ground floor 709 of increase, include the particulate 711 that has negative charge in each unit box of the additional second layer 712; Charged corpuscle 713 opposite polarity of electrophoretic display device 702 in the charged corpuscle 708 of electrophoretic display device 701, the second layer display element layer in the polarity of the charged corpuscle of these two extra plays and the ground floor display element layer.Ground floor display element layer and second layer display element layer are staggered laminated together, and the upper strata lamination of ground floor display element layer adds ground floor, and lower floor's lamination of second layer display element layer adds the second layer.Optionally seal with sealant 703 between layer and the layer.Because the additional ground floor and the additional second layer all are transparent, therefore can not influence the optical characteristics of display layer.This four-layer structure is to be clipped between top transparent conducting film 704 and the bottom conductive film 705.(Fig. 7 a) at " ON " state, top transparent conducting film 704 adds negative voltage, bottom conductive film 705 adds positive voltage, this moment is under the electric field force effect, the particulate that has negative charge 710 of additional ground floor 709 is pushed to the bottom of additional ground floor, the charged corpuscle 708 of electrophoretic display device 701 attracted to the top of this layer in the ground floor display element layer, the charged corpuscle 713 of electrophoretic display device 702 attracted to the top of this layer in the second layer display element layer, and the particulate that has negative charge 711 of the additional second layer 712 attracted to the bottom of this layer.If remove the voltage that is added between top transparent conducting film 704 and the bottom conductive film 705 this moment, because the existence of the additional ground floor 709 and the additional second layer 712, the negative charge particulate in the additional ground floor and the positive charge particulate of display element layer continue the certain electric field force of maintenance, and the electronegative particulate of the additional second layer is owing to compare first extra play, with display element layer 701, the distance of the charged corpuscle in the display element layer 702 is farther, thereby electric field force is little, make negative charge particulate and display element layer 701 in the additional ground floor, the positive charge particulate of display element layer 702 continues the certain electrical field attraction of maintenance, even have vibrations or other general interference can not influence this electric field force, thereby improve the optical stability of electrophoretic display device (EPD) effectively.Equally, at " OFF " state (Fig. 7 b), top transparent conducting film 704 adds positive voltage, bottom conductive film 705 adds negative voltage, this moment is under the electric field force effect, the particulate that has negative charge 710 of additional ground floor 709 attracted to the top of additional ground floor, the charged corpuscle 708 of electrophoretic display device 701 is pushed the bottom that pours into this layer in the ground floor display element layer, the charged corpuscle 713 of electrophoretic display device 702 is pushed the bottom that pours into this layer in the second layer display element layer, and the particulate that has negative charge 711 of the additional second layer 712 is pulled to the top of this layer.If remove the voltage that is added between top transparent conducting film 704 and the bottom conductive film 705 this moment, because the existence of the additional ground floor 709 and the additional second layer 712, the negative charge particulate in the additional second layer and the positive charge particulate of display element layer continue the certain electric field force of maintenance, and the electronegative particulate of additional ground floor is owing to compare second extra play, with display element layer 701, the distance of the charged corpuscle in the display element layer 702 is farther, thereby electric field force is little, make negative charge particulate and display element layer 701 in the additional second layer, the positive charge particulate of display element layer 702 continues the certain electrical field attraction of maintenance, even have vibrations or other general interference can not influence this electric field force, thereby improve the optical stability of electrophoretic display device (EPD) effectively.Simultaneously because the non-movable separated region of ground floor display element layer and effective box zone of second layer display element layer are staggered, and the sealed sides of both sides faces one another.This four-layer structure is to be clipped between top transparent conducting film 704 and the bottom conductive film 705.(Fig. 7 a) attracted to the top of box in the white particles of ground floor display element layer and second layer display element layer at " ON " state.The separated region 706 of top layer will present " white ".On the contrary, at " OFF " state (Fig. 7 b), all attracted to the bottom of box in the white particles of ground floor display element layer and second layer display element layer.The separated region 706 of top layer will be " colour " of painted existing solvent.In this four-layer structure, both improved the optical stability of each display element of display, solved the problem of the reflectivity contradiction under contrast and the minimum light density state again, improve the reflectivity under the minimum light density state when realizing improving contrast.
Fig. 8 a, 8b and 8c represent to adopt the method for making the electrophoretic display device (EPD) of the single or multiple lift display element with extra play in the technology of the present invention.Fig. 8 a represents to prepare by the additional ground floor 809 of lamination, display element layer 801 and the additional second layer 812 method of the single layered display element layer electrophoretic display device (EPD) with two-layer extra play.Display element through filling seals separately with sealant 803.At the conducting film 804 of watching side is transparent, and can be by melanism at the non-conducting film 805 of side of watching.Can use bonding agent to promote lamination process.
Fig. 8 b represents to prepare by the additional ground floor 809 of lamination, first display element layer 801, second display element layer 802 and the additional second layer 812 method of the double-deck display element layer electrophoretic display device (EPD) with two-layer extra play.Display element through filling seals separately with sealant 803.At the conducting film 804 of watching side is transparent, and can be by melanism at the non-conducting film 805 of side of watching.Can use bonding agent to promote lamination process.The non-movable separated region 806 of one deck is arranged with interlace mode with effective box district of another floor in first display element layer 801 and second display element layer 802.
Fig. 8 c represents that another kind of preparation has the method for the single layered display element layer electrophoretic display device (EPD) of extra play.(i) the additional second layer 812 of preparation on conducting film 805; (ii) use step identical in (i), preparation display element layer 801 on disengaging type substrate 807; (iii) with bonding agent the display element layer 801 on the disengaging type substrate 807 is laminated on the layer 812 alternatively; (iv) remove disengaging type substrate 807; (v) use step identical in (i), the additional ground floor 809 of preparation on disengaging type substrate 807; (vi) with bonding agent the additional ground floor 809 on the disengaging type substrate 807 is laminated on the layer 801 alternatively; (iv) remove disengaging type substrate 807; (v) with bonding agent the composite film that obtains is pressed on the conducting film 804 alternatively.Can repeating step (ii), (iii), (iv), have the electrophoretic display device (EPD) of two-layer above display element layer with preparation.
As the electrophoretic display device (EPD) of above-mentioned prepared single or multiple lift display element layer with extra play in, arrange with interlace mode the non-movable separated region of upper strata display element layer and lower floor display element layer zone of action is very important, and one of at least two conducting films 804,805 are pre-image conversions.In addition, be transparent at the conducting film 804 of watching side at least.
Fig. 9 a and 9b represent to adopt technology of the present invention to have the two-layer display element layer color electrophoretic display of extra play.The wherein additional ground floor 909 and the additional second layer 912 are transparent, additional ground floor 909 is positioned on first display element layer 901, first display element layer 901 comprises the display box of filling with red, green and blue electrophoresis liquid, the additional second layer 912 is positioned under second display element layer 902, and second display element layer 902 comprises the display box of filling with the black electrophoresis liquid.In two figure, effective box zone of the non-zone of action 906 of first display element layer 901 and second display element layer 902 is staggered.This four-layer structure is to be clipped between two conducting films 904,905.One of at least two conducting films are transparent.
Figure 10 a and 10b represent to adopt technology of the present invention to have the two-layer display element layer full color electrophoretic display of extra play.The wherein additional ground floor 1009 and the additional second layer 1012 are transparent, additional ground floor 1009 is positioned on first display element layer 1001, first display element layer 1001 comprises the display box of filling with red, green and blue electrophoresis liquid, the additional second layer 1012 is positioned under second display element layer 1002, and second display element layer 1002 comprises that filling is with display box red, green, blue, the black electrophoresis liquid.In two figure, effective box zone of the non-zone of action 1006 of first display element layer 1001 and second display element layer 1002 is staggered.This four-layer structure is to be clipped between two conducting films 1004,1005.One of at least two conducting films are transparent.
Claims (10)
1. electrophoretic display device (EPD) comprises:
One or more layers of display element layer;
Additional ground floor;
The additional second layer;
Described display element layer is laminated between the additional ground floor and the additional second layer;
Described additional ground floor has identical charge polarity with the additional second layer;
The described additional ground floor and the additional second layer have the opposite charge polarity of electrophoresis liquid of filling with display element layer;
Described display element layer, additional ground floor, the additional second layer form rhythmo structure.
2. electrophoretic display device (EPD) according to claim 1 is characterized in that described display element layer is a kind of miniature cup array, and each described miniature cup comprises:
Partition wall;
Be filled in electrophoresis composition wherein; And
Polymeric seal layer, described polymeric seal layer are to be formed by the sealing compositions that proportion is lower than described electrophoresis composition, and adhere to hermetically on the described partition wall, so that the electrophoresis composition is sealed in each miniature cup.
3. electrophoretic display device (EPD) according to claim 1 is characterized in that described additional ground floor, the additional second layer are a kind of miniature cup arrays, and each described miniature cup comprises:
Partition wall;
Be filled in electrophoresis composition wherein; And
Polymeric seal layer, described polymeric seal layer are to be formed by the sealing compositions that proportion is lower than described electrophoresis composition, and adhere to hermetically on the described partition wall, so that the electrophoresis composition is sealed in each miniature cup.
4. according to the described electrophoretic display device (EPD) of claim 3, it is characterized in that described electrophoresis composition is transparent.
5. according to the described electrophoretic display device (EPD) of claim 1, it is characterized in that described display element layer comprises electrophoretic medium, described electrophoretic medium comprises the discrete droplets of a plurality of electrophoretic mediums in polymer adhesive, and each droplet comprises a plurality of charged particles, and described charged particle is dispersed in the suspending liquid.
6. according to the described electrophoretic display device (EPD) of claim 1, it is characterized in that described additional ground floor, the additional second layer comprise electrophoretic medium, described electrophoretic medium comprises the discrete droplets of a plurality of electrophoretic mediums in polymer adhesive, each droplet comprises a plurality of charged particles, and described charged particle is dispersed in the suspending liquid.
7. according to the described electrophoretic display device (EPD) of claim 6, it is characterized in that described electrophoretic medium is transparent.
8. make the method for the electrophoretic display device (EPD) of display board, comprising with extra play:
A) prepare one or more layers display element layer respectively;
B) preparation adds the ground floor and the additional second layer respectively;
C) with adhesive phase described one deck display element layer is laminated to another layer display element layer alternatively;
D) described additional ground floor is laminated on the face of multilayer display element layer of described one deck display element layer or lamination with adhesive phase alternatively;
E) the described additional second layer is laminated on another face of multilayer display element layer of described one deck display element layer or lamination with adhesive phase alternatively.
9. make the method for the electrophoretic display device (EPD) of display board, comprising with extra play:
A) on conducting film, form additional ground floor;
B) shifting formation ground floor display element layer on the abscission layer;
C) described ground floor display element layer is laminated to described additional ground floor and removes described transfer abscission layer;
D) on the transfer abscission layer, form more display element layer alternatively respectively;
E) described more display element layer is laminated to the top layer that stacks layer that has formed and removes described transfer abscission layer;
F) shifting the additional second layer of formation on the abscission layer;
G) the described additional second layer is laminated to the top layer that stacks layer that has formed and removes described transfer abscission layer;
I) second conductive film layer is pressed on the described the superiors that stack layer.
10. have the method for electrophoretic display device (EPD) of the display board of extra play as claim 8 or the described manufacturing of claim 9, it is characterized in that:
Described display element layer is as claim 2 or claim 5 described display element layer;
The described additional ground floor and the additional second layer are as claim 3 or claim 4 or the claim 6 or the claim 7 described additional ground floor and the additional second layers.
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| CNB2007101776880A CN100520553C (en) | 2007-11-20 | 2007-11-20 | Improved electrophoretic display and preparation method thereof |
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| WO2011001023A1 (en) * | 2009-06-30 | 2011-01-06 | Nokia Corporation | Display apparatus and associated methods |
| CN102804050A (en) * | 2009-06-18 | 2012-11-28 | 惠普开发有限公司 | Reflective display pixel |
| CN103180782A (en) * | 2010-10-27 | 2013-06-26 | 株式会社櫻花彩色笔 | Electrophoretic display device |
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