CN1963654A - Information display panel - Google Patents

Abstract

An information display panel, wherein one or more kinds of display media (3) comprising at least one kind of particle having optical reflectance and charging characteristics, are sealed in a space between two opposed substrates and (1, 2), at least one of which is transparent, and wherein the display media, to which an electrostatic field is applied, are made to move so as to display information such as an image or the like, comprises the construction such that when a color filter (27) consisting of a certain number of colors of filters 27R, 27G and 27B being arranged is provided at the transparent substrate of a display side for color display, each end of adjacent color filters having different colors are superimposed. Herewith even when color filters are used for color display, an information display panel can be provided, whose manufacturing process can be simplified and whose cost is low.

Description

Information display panel

Technical field

The present invention relates to a kind of information display panel, it encloses display medium between at least one side is transparent two substrates, by display medium being applied electric field display medium is moved, thus information such as display image.

Background technology

Traditionally, instead the information display device of liquid crystal indicator (LCD) has proposed to adopt electrophoresis mode, electricity to cause the information display device of technology such as colored display mode, thermic mode, double-colored particle rotation mode.

These prior aries are compared with LCD, can obtain little with approaching big field angle, the power consumption of common printed thing, as to have memory function etc. advantage owing to have, therefore can consider can be used as follow-on cheap information display device, can expect to apply it to portable terminal device with aspects such as information demonstration, Electronic Paper.Particularly the electrophoresis mode that proposes is recently expected that very this electrophoresis mode is behind the dispersion liquid microencapsulation that will be made of discrete particles and solution it to be configured between the opposing substrates.

Yet, in the electrophoresis mode, because particle swimming in liquid, thereby the slack-off problem of response speed that exists the viscous resistance by liquid to cause.In addition, because the particle dispersion that makes high specific gravity such as titanium dioxide is in low-gravity solution, thereby the easy sedimentation that becomes, be difficult to keep the stability of disperse state, have the problem of the repetition stability that shortage information shows.In addition,, make cell size reach the level of microcapsules, also just make above-mentioned shortcoming be difficult to show from the teeth outwards, but still do not solve the problem of any essence even carried out microencapsulation.

On the other hand, for the electrophoresis mode of utilizing the behavior in the solution, recently the scheme that also begins to have proposed to pack into conductive particle and charge transport layer and do not use solution on the part of substrate (for example, with reference to State of Zhao come, other 3 people, " new い ト Na one デ イ ス プ レ イ デ バ イ ス (I) ", on July 21st, 1999, Japan's iconology meeting annual conference (the 83rd) " Japan Hardcopy ' 99 " collection of thesis, p.249-252).Yet, because because of charge transport layer being set and charge generating layers makes structure complicated, and be difficult in conductive particle iunjected charge consistently, thereby also have the problem of stability when lacking update displayed information.

As a method that is used to solve above-mentioned variety of issue, known have a kind of information display panel, it is between at least one side is transparent two opposing substrates, after enclosing display medium, perhaps form the cell of isolating mutually by the next door, after in cell, enclosing display medium, display medium is applied electric field and display medium is moved, thus information such as display image.

In above-mentioned existing information display panel, show in order to carry out colour, can consider: use the filtrator of arranging the specified color number and the color filter that constitutes.The for example normally used color filter 51 that is made of the filtrator of red (R), green (G), blue (B), the example of one as shown in figure 15 constitutes 1 display unit 52 by red filtrator 51R, green filters 51G, blue filter 51B like that.And,, between each filtrator, be formed with the black matrix 53 of black in order to obtain the contrast of good Show Color.Therefore, in the existing color filter 51 of said structure, need between each filtrator, form the operation of black matrix 53, exist manufacturing process to complicate, and the problem that uprises of cost.

Summary of the invention

The objective of the invention is to address the above problem a little, a kind of information display panel is provided, even it is using color filter to carry out also can simplifying manufacturing process, and reducing cost under the colored situation about showing.

Information display panel of the present invention, it is space between transparent two substrates at least one side, the display medium more than at least a kind that inclosure is made of the particle more than at least a kind with optical reflectivity and charging property, by display medium being applied electric field display medium is moved, thereby information such as display image, it is characterized in that, on the transparency carrier that shows side, the filtrator of arranging the specified color number is set and the color filter that constitutes, carrying out colour shows, at this moment, make following structure: make between the end of filtrator of adjacent different colours overlapping.

In addition, preferred embodiments as information display panel of the present invention has: the filtrator that color filter is arranged redness (R), green (G), blue (B) constitutes, by 1 display unit of filtrator formation of 1 group of redness (R), green (G), blue (B); The filtrator that color filter is arranged cyan (C), magenta (M), yellow (Y) constitutes, and constitutes 1 display unit by 1 group of cyan, magenta, yellow filtrator; When the filtrator that makes adjacent different colours is overlapping, make the end of filtrator form opposite mutually stepped of teat, make up stair-stepping end and constitute the plane color filter; Make following structure: the display medium more than at least a kind that is sealing at least one side and is the space between two transparent substrates is the display medium of white display medium and these two kinds of colors of black display medium, electrode is set respectively on opposing substrates, by the electric field that produces between electrode, display medium is moved along the direction vertical with respect to panel, thus information such as display image; Make following structure: at least one side that will enclose described display medium is the space between transparent two substrates, is divided into the cell space of every at least 1 display unit by the next door, is provided with the color filter of 3 looks on the substrate corresponding to this cell.

According to the present invention, make the overlapping color filter that constitutes between the end of filtrator of adjacent different colours by use, the filtrator overlapping end of color filter is brought by the synthetic colour mixture of two kinds of colors, can obtain and the equal effect of black matrix in the past, can keep good contrast same, in addition, black matrix needn't be set, can simplify manufacturing process, and low cost obtains information display panel.

Description of drawings

The (a) and (b) of Fig. 1 are respectively the figure of an example of expression information display panel of the present invention.

The (a) and (b) of Fig. 2 are respectively the figure of another example of expression information display panel of the present invention.

The (a) and (b) of Fig. 3 are respectively the figure of the another example of expression information display panel of the present invention.

The (a) and (b) of Fig. 4 are respectively the figure of the another example of expression information display panel of the present invention.

The (a) and (b) of Fig. 5 are respectively the figure of the another example of expression information display panel of the present invention.

The (a) and (b) of Fig. 6 are respectively the figure of the another example of expression information display panel of the present invention.

Fig. 7 it (a)～(d) is respectively the figure of the another example of expression information display panel of the present invention.

Fig. 8 is the figure of the another example of expression information display panel of the present invention.

Fig. 9 is the figure of the another example of expression information display panel of the present invention.

Figure 10 is the figure of structure of an example of expression information display panel of the present invention.

Figure 11 is the figure of structure of another example of expression information display panel of the present invention.

Figure 12 is the figure of structure of the another example of expression information display panel of the present invention.

Figure 13 is the figure of structure of the another example of expression information display panel of the present invention.

Figure 14 is the figure of an example of the shape of expression information display panel median septum of the present invention.

Figure 15 is the figure that is used for illustrating an example of the employed color filter of existing information display panel.

Embodiment

At first, the basic structure to information display panel of the present invention describes.In information display panel, apply electric field to the display medium that is sealing into two spaces between the opposing substrates as object of the present invention.Along the direction of an electric field that is applied, charged display medium is subjected to the attraction of electric field force, Coulomb force etc., and display medium moves according to the variation of direction of an electric field, thereby the information of realization image etc. shows.Therefore, information display panel must be designed to that display medium moves equably, and stability can keep the repetition update displayed time or the stability when display message shown continuously.At this, be applied to the power on the particle that constitutes display medium, except the power that attracts each other that produces by the Coulomb force between the particle, also have the image force, intermolecular force, liquid bridge power, gravity of itself and electrode or substrate etc.

Based on (a) and (b)～Fig. 9 of Fig. 1, the basic structure of information display panel of the present invention is described.

At Fig. 1 it (a), (b) in the example shown in, in each cell that forms by next door 4, will be by the optical reflectivity that particle more than at least a kind constitutes the display medium at least 2 kind or more 3 different (shown here is the white display medium 3W that is made of the particle swarm that shows with white particle 3Wa and the black display medium 3B that is made of with the particle swarm of black particle 3Ba demonstration) corresponding to by between electrode 5 (discrete electrodes) that is arranged at substrate 1 and the electrode 6 (discrete electrodes) that is arranged at substrate 2, applying the electric field that voltage produces, with substrate 1 with charged characteristic, 2 vertically move.So, shown in Fig. 1 it (a), make the visible white display medium 3W of observer and carry out white and show, perhaps shown in Fig. 1 it (b), make observer's visible black color display medium 3B and carry out black display.In addition, in the (a) and (b) of Fig. 1, omitted the next door that is positioned at the front side.Electrode can be arranged on the substrate outside, also can imbed substrate inside.Being provided with under the situation of color filter, is example as described below: 3 cells shown in the constitutional diagram and each color filter of RGB and the part that constitutes by each corresponding color filter, form a cell as 1 display unit.

Example shown in the (a) and (b) of Fig. 2 is to remove the example in next door from the example shown in the (a) and (b) of Fig. 1.Being provided with under the situation of color filter, is following example: by per 1 display unit that constitutes with the color filter combination, form a cell by next door 4.

At Fig. 3 it (a), (b) in the example shown in, in each cell that forms by next door 4, will be by the optical reflectivity that particle more than at least a kind constitutes the display medium at least 2 kind or more 3 different (shown here is the white display medium 3W that is made of the particle swarm that shows with white particle 3Wa and the black display medium 3B that is made of with the particle swarm of black particle 3Ba demonstration) corresponding to by between electrode 5 (line electrode) that is arranged at substrate 1 and the electrode 6 (line electrode) that is arranged at substrate 2, applying the electric field that voltage produces, with substrate 1 with charged characteristic, 2 vertically move.So, shown in Fig. 3 it (a), make the visible white display medium 3W of observer and carry out white and show, perhaps shown in Fig. 3 it (b), make observer's visible black color display medium 3B and carry out black display.In addition, in the (a) and (b) of Fig. 3, omitted the next door that is positioned at the front side.Electrode can be arranged on the substrate outside, also can imbed substrate inside.Being provided with under the situation of color filter, is example as described below: each color filter combination of 3 cells shown in the figure and RGB and the part that constitutes by each corresponding color filter, form a cell as 1 display unit.

Example shown in the (a) and (b) of Fig. 4 is to remove the example in next door from the example shown in the (a) and (b) of Fig. 3.Being provided with under the situation of color filter, is following example: by per 1 display unit that constitutes with the color filter combination, form a cell by next door 4.

In the example shown in the (a) and (b) of Fig. 5, in each cell that forms by next door 4, at least the display medium that has optical reflectivity and charging property 3 that will be made of particle more than at least a kind (shown here is the white display medium 3W that is made of the particle swarm that shows with white particle 3Wa) is corresponding to by applying the electric field that voltage produces between electrode 5 that is arranged at substrate 1 and electrode 6, edge and substrate 1,2 parallel directions move.So, shown in Fig. 5 it (a), make the visible white display medium 3W of observer and carry out white and show, perhaps shown in Fig. 5 it (b), make the color of observer's visible black color plate 7B and carry out black display.In addition, in the example shown in the (a) and (b) of Fig. 5, omitted the next door that is positioned at the front side.Electrode can be arranged on the substrate outside, also can imbed substrate inside.Being provided with under the situation of color filter, is example as described below: each color filter combination of 3 cells shown in the figure and RGB and the part that constitutes by each corresponding color filter, form a cell as 1 display unit.

Example shown in the (a) and (b) of Fig. 6 replaces with black display medium 3B with the white display medium 3W of the example shown in the (a) and (b) of Fig. 5, and black plate 7B is replaced with white plate 7W, also can carry out same demonstration.

In the example shown in Fig. 7 it (a)～(d), at first, as Fig. 7 it (a), (c) shown in, in each cell that forms by next door 4, the external electrical field that the optical reflectivity that is made of particle more than at least a kind the display medium at least 2 kind or more 3 different with charged characteristic (shown here is the white display medium 3W that is made of the particle swarm that shows with white particle 3Wa and the black display medium 3B that is made of with the particle swarm of black particle 3Ba demonstration) forms member 11 corresponding to the external electrical field in the outside of being located at substrate 1 and be located at the outside of substrate 2 forms the electric field that applies voltage between the member 12 and produce, with substrate 1,2 vertically move.So, shown in Fig. 7 it (b), make the visible white display medium 3W of observer and carry out white and show, perhaps shown in Fig. 7 it (d), make observer's visible black color display medium 3B and carry out black display.In addition, in Fig. 7 it (a)～(d), omitted the next door that is positioned at the front side.In addition, be provided with conductive component 13, and be provided with conductive component 14 in the inboard of substrate 2 in the inboard of substrate 1.This conductive component can not be provided with yet.Being provided with under the situation of color filter, is example as described below: each color filter combination of 3 cells shown in the figure and RGB and the part that constitutes by each corresponding color filter, form a cell as 1 display unit.

Above-mentioned explanation goes for will being replaced with by the white display medium 3W that particle swarm constitutes respectively the white display medium that is made of powder fluid equally, will be replaced with the situation of the black display medium that is made of powder fluid by the black display medium 3B that particle swarm constitutes.Will be described hereinafter for powder fluid.

In Fig. 8 and example shown in Figure 9, illustrated that the example shown in the (a) and (b) with Fig. 4 similarly uses line electrode 5,6 to carry out other example of white black demonstration.In example shown in Figure 8, use is filled into the microcapsules 9 that inside forms with white display medium 3W, black display medium 3B with iknsulating liquid 8, the cell that is formed by next door 4 of replaced the filling shown in the (a) and (b) of Fig. 4 white display medium 3W and black display medium 3B.In addition, in example shown in Figure 9, use with half polarity of whitewashing half blacking also mutually opposite screw 10 be filled into the microcapsules 9 that inside forms as display medium with iknsulating liquid 8, the cell that forms by next door 4 of replaced the filling shown in the (a) and (b) of Fig. 4 white display medium 3W and black display medium 3B.Fig. 8 and arbitrary example shown in Figure 9 can similarly carry out white black demonstration with the example shown in Fig. 4 it (b), be provided with under the situation of color filter, be example as described below: by per 1 display unit, form a cell by next door 4, described display unit is each color filter combination of 3 microcapsules cells and RGB and constituting.

The invention is characterized in, in the information display panel of said structure, on the transparency carrier that shows side, the filtrator of arranging the specified color number is set and the color filter that constitutes, carrying out colour shows, at this moment, make following structure: make between the end of filtrator of adjacent different colours overlapping.Below, describe for object lesson.

Figure 10 is the figure of structure of an example of expression information display panel of the present invention.In the example shown in Figure 10,, omit explanation to it to having added same symbol with the same parts of (a) and (b)～Fig. 9 of Fig. 1.In example shown in Figure 10, points different with the example of the (a) and (b) of Fig. 1～shown in Figure 9 on basic structure are, corresponding to red (R), green (G), blue (B), constitute the line electrode 6 that shows side by line electrode 6R, 6G, 6B, carry out the demonstration of 1 pixel.In the present example, except that above structure, also between transparent demonstration side group plate 2 and line electrode 6R, 6G, 6B, color filter 27 is set, described color filter 27 is color filters of following structure: arrange red, green, blue filtrator and be filtrator 27R, 27G, 27B and the end that makes filtrator and form opposite mutually stepped of teat, make up stair-stepping end and constitute plane color filter.By per 1 display unit that constitutes with the color filter combination, form a cell by next door 4.

Figure 11 is the figure of structure of another example of expression information display panel of the present invention.Example shown in Figure 11 is following example: 1 display unit that constitutes with color filter of example shown in Figure 10 is further separated by next door 4, form a cell by each corresponding color filter.The height in 2 next doors of central authorities shown in the figure also can be made into the incomplete next door shorter than the gap between substrate.

In said structure, the overlapping of the end of filtrator is stair-stepping part, it is configured in demonstration is not had on the part of contribution between electrode 6R, 6G, the 6B, and the overlapping colour mixture that forms of the filtrator that becomes adjacent different colours, thereby performance and the equal effect of existing black matrix, can keep good contrast.The width of overlapping part preferably equates with interelectrode non-display area or is littler than it, and bigger than a half width of the mean grain size of particle for display medium.If the width of lap is bigger than non-display area, then the brightness of display panel reduces, if the width of lap is littler than half of the mean grain size of particle for display medium, then the contrast of display panel reduces.On this basis, can provide a kind of information display panel, it needn't be provided with black matrix, can simplify manufacturing process, and reduce cost.

Figure 12 is the figure of structure of the another example of expression information display panel of the present invention.In the example shown in Figure 12,, omit explanation to it to having added same symbol with the same parts of Figure 10, example shown in Figure 11.In example shown in Figure 12, with constitute R, the G of color filter 27, filtrator 27R, the 27G of B, the shape of 27B is made the shape different with example shown in Figure 10, and make up stair-stepping end and constitute.In addition, in example shown in Figure 12, make R, the G that constitutes color filter 27, filtrator 27R, the 27G of B, the arrangement mode of 27B be made as filtrator 27R, 27B, 27G, and, corresponding to this, the arrangement mode of discrete electrodes is made as electrode 6R, 6B, 6G.In any example, can obtain and the same effect of example shown in Figure 10,11.By per 1 display unit that constitutes with the color filter combination, form a cell by next door 4.

Figure 13 is the figure of structure of the another example of expression information display panel of the present invention.Example shown in Figure 13 is following example: 1 display unit that constitutes with color filter of example shown in Figure 12 is further separated by next door 4, by each corresponding color filter, form a cell.The height in illustrated central 2 next doors also can be made into the incomplete next door shorter than the gap between substrate.

In addition, in above-mentioned example, make overlapping between the end of filtrator stepped and implement, but the present invention is not limited thereto, other any structure just can utilize so long as be overlapped into colour mixture (being preferably dead color) between the end of filtrator.In addition, the concavo-convex more planarization for the overlapping portion between the end that makes filtrator also can be used as protective seam planarization layer is set, and forms electrode then.In addition, in above-mentioned example, color filter 27 is arranged on the inboard of substrate 2, but the present invention is not limited thereto.Further, in above-mentioned example, the formation of the color of color filter 27 is made as redness, green, blueness, but the present invention is not limited thereto, and also can be made as cyan, magenta, yellow group.In addition, in above-mentioned example, electrode is located at the inboard of color filter 27, but also can make allocation position opposite.In the panel of electrode is not set, can directly exposes color filter 27, but also transparent protective seam can be set on the surface of color filter 27.

Below, describe for formation each parts as the information display panel of object of the present invention.

About substrate, the substrate that is provided with a side of color filter is the transparent substrate 2 that can observe the color of display medium 3 from the outside of panel, and its suitable material is the visible light transmittance height, and the good material of thermotolerance.Substrate 1 can be transparent also can be opaque.Baseplate material is carried out illustrative words, can list polymer sheets such as polyethylene terephthalate, Polyethylene Naphthalate, polyethersulfone, tygon, polycarbonate, polyimide, esters of acrylic acid or metal sheet such have a flexible material, and glass, quartz etc. do not have flexible inorganic sheet.The thickness of substrate is preferably 2～5000 μ m, further is suitably for 5～2000 μ m, if thin excessively, then is difficult to keep intensity, substrate distance homogeneity, if thicker than 5000 μ m, then is unsuitable for making the situation of slim information display panel.

Electrode as electrode that is provided with corresponding to needs or conductive component forms material, can metal species such as aluminium, silver, nickel, copper, gold be arranged illustration, conducting metal oxide classes such as tin indium oxide (ITO), antimony tin (ATO), indium oxide, conductive tin oxide, electroconductive zinc oxide, electroconductive polymer classes such as polyaniline, polypyrrole, polythiophene can suitably be selected to use.Formation method as electrode, can adopt by sputtering method, vacuum vapour deposition, CVD (chemical vapor deposition) method, rubbing method etc. to make above-mentioned illustrative material form method of patterning, perhaps adopt by conductive agent being mixed into be coated with in solvent or the synthetic resin adhesive and form method of patterning with film like.Electrode that is provided with on the substrate of visual side (display surface side) or conductive component must be transparent, but the electrode or the conductive component that are arranged on the rear side substrate need not to be transparent.No matter be which kind of situation, all be fit to the above-mentioned material that use can form pattern and have electric conductivity.In addition,, be suitably for 3～1000nm, be preferably 5～400nm as long as the thickness of electrode or conductive component can be guaranteed electric conductivity, not hinder transmitance.Material, thickness that is arranged on electrode on the rear side substrate or conductive component etc. can be same with above-mentioned electrode or the conductive component that is arranged on the display surface side group plate, but need not to be transparent.In addition, can superpose direct current or interchange of the external voltage input during this situation.

For the next door 4 that is arranged at substrate, its shape can be according to shape, the configuration of the kind of the display medium that is used to show, the electrode that disposed, suitably carrying out optimization sets, limited without exception, but the width in next door can be adjusted into 2～100 μ m, be preferably 3～50 μ m, and the height in next door can be adjusted into 10～100 μ m, be preferably 10～50 μ m.

In addition, when forming the next door, can consider the both sides of the chest method that behind each self-forming rib on relative two substrates 1,2, engages respectively, only on the substrate of a side, form single rib method of rib.In the present invention, arbitrary method all is fit to use.

By the cell that the next door that is made of these ribs forms, as shown in figure 14, observe from the base plan direction, can quadrilateral, triangle, wire, circle, hexagon be arranged illustration, as its configuration, can clathrate, cellular or mesh shape be arranged illustration.Reasonable is to dwindle as far as possible and divide suitable part (area of cell frame part) from the visual next door cross-section of display surface one side, can increase the sharpness of demonstration like this.

At this,, can enumerate mould transfer printing, silk screen print method, sand-blast, photoetching process, additive process if the formation method of counter septum is carried out example.Arbitrary method is all applicable in the information display panel of the present invention, but in these methods, photoetching process, the mould transfer printing of etchant resist used in preferred employing.

Then, in information display panel of the present invention, for describing as the employed for example powder fluid of display medium.In addition, about the title of the powder fluid that uses in the information display panel of the present invention, the applicant obtains the right of " electronics powder fluid (registered trademark): accession designation number 4636931 ".

" powder fluid " among the present invention is neither also self not demonstrate both material of intermediateness mobile, that have fluid and particle characteristics concurrently by the power of liquid by the power of gas.For example, liquid crystal be defined as liquid and solid in the middle of mutually, have as the mobile of fluid characteristics with as anisotropy (optical property) (the ordinary society: big encyclopaedia dictionary) of solid features.On the other hand, even the definition of particle is the object that negligible substantially size also has limited quality, (ball is kind: the physics dictionary) to be subjected to the influence of gravity.At this, also there is the special state that is called gas-solid fluidized bed body, liquid-solid liquid in the particle, if from base plate to particle jet-flow gas, then the speed corresponding to gas applies power upwards to particle, when this power and gravitational equilibrium, be in the state that as fluid, can flow easily, be referred to as gas-solid fluidized bed body, similarly will utilize fluid to make the state of its liquidation be called liquid-solid liquid (ordinary society: big encyclopaedia dictionary).Such gas-solid fluidized bed body or liquid-solid liquid are the states that utilizes gas stream or flow of liquid.In the present invention, the clear and definite material that also self does not demonstrate mobile state by the power of such gas by the power of liquid of can producing specifically neither is defined as powder fluid with it.

Promptly, powder fluid among the present invention is same with the definition of liquid crystal (centre of liquid and solid mutually), be the intermediateness that has particle and liquid two characteristics concurrently, demonstrate the utmost point feel bad aforementioned gravity as particle characteristic influence and have the material of the special state of high fluidity.Such material can obtain with aerosol state, promptly obtain as the dispersed system that dispersed substance stably swims in the gas with solid shape or liquid material, in information display panel of the present invention, with solid shape material as dispersed substance.

Information display panel of the present invention, between at least one side is transparent opposing substrates, for example enclose in gas as the stably floating powder fluid that the aerosol state of solid particle is arranged and demonstrate high fluidity of dispersed substance, such powder fluid is rich mobile, even can not measure angle of repose as the index that shows powder fluidity, low electric field force is down just can be easily stably mobile under the effect of Coulomb force etc.

The for example powder fluid that uses as display medium among the present invention as mentioned above, is neither also self just not demonstrate both material of intermediateness mobile, that have fluid and particle characteristics concurrently by the power of liquid by the power of gas.This powder fluid especially can be taked aerosol state, in information display panel of the present invention, solid shape material floats state in gas more stablely as dispersed substance under, is used as display medium.

Below, describe for the example of the particle for display medium that in information display panel of the present invention, constitutes display medium (below be also referred to as particle).Particle for display medium can be only directly be made of to constitute with as display medium or be modulated into powder fluid with as display medium as display medium or with other particle this particle for display medium.

In particle, in resin, can comprise charge control agent, colorant, inorganic additive etc. as required as its principal ingredient samely.Below, example illustrates resin, charge control agent, colorant, other adjuvant.

Example as resin, can list urethane resin, urea resin, acrylic resin, vibrin, acrylated polyurethane resin, acroleic acid polyurethane silicone resin, acroleic acid polyurethane fluororesin, acrylic acid fluororesin, silicone resin, silicon Acrylote ketone resin, epoxy resin, polystyrene resin, styrene acrylic resin, polyolefin resin, butyral resin, permalon, melmac, phenolics, fluororesin, polycarbonate resin, polysulfone resin, polyether resin, polyamide etc., also can mix more than 2 kinds.Particularly from the viewpoint of control with the bounding force of substrate, what be fit to is acrylated polyurethane resin, silicon Acrylote ketone resin, acrylic acid fluororesin, acroleic acid polyurethane silicone resin, acroleic acid polyurethane fluororesin, fluororesin, silicone resin.

For charge control agent, be not particularly limited, as negative charge controlling agent, can list oil-soluble dyes, quaternary ammonium compound, calixarene compound, boron-containing compound (benzoic acid boron complex), nitro imidazole derivatives of for example salicylic acid metal complex, containing metal azo dyes, containing metal (containing metallic ion or metallic atom) etc.As positive charge control agent, can list for example aniline black byestuffs, triphenyl methane compounds, quaternary ammonium compound, polyamino resin, imdazole derivatives etc.In addition, can also be with the resin of nitrogenous ring compound such as metal oxide, pyridine such as ultra micron silicon dioxide, ultra micron titanium dioxide, ultra micron aluminium oxide and derivant thereof or salt, various organic pigment, fluorine-containing, chlorine, nitrogen etc. etc. as charge control agent.

As colorant, can use pigment, dyestuff various of all kinds as following illustrative organic or inorganic.

As black colorant, can use carbon black, cupric oxide, manganese dioxide, nigrosine, activated charcoal etc.

As blue colorant, the C.I. pigment blue 15 is arranged: 3, the part chloride of C.I. pigment blue 15, dark purple, cobalt blue, alkali blue lake, Victoria blue color lake, phthalocyanine blue, metal-free phthalocyanine blue, phthalocyanine blue, fast sky blue, indanthrene blue BC etc.

As red stain, have that colcother, cadmium red, red lead, mercuric sulphide, cadmium, permanent red 4R, lithol red, pyrazolone red, Wo Qiuge are red, calcium salt, C lake red CAN'T D, brilliant carmine 6B, eosine lake, rhodamine color lake B, alizarine lake, bright carmine 3B, C.I. paratonere 2 etc.

As yellow colorants, chrome yellow, zinc yellow, cadmium yellow, yellow iron oxide, inorganic permanent yellow, nickel titanium yellow, navel orange Huang, naphthol yellow S, hansa yellow G, hansa yellow 10G, benzidine yellow G, benzidine yellow G R, quinoline yellow lake, permanent yellow NCG, tartrazine lake, C.I. pigment Yellow 12 etc. are arranged.

As green colourant, chrome green, chromium oxide, pigment green B, C.I. pigment Green 7, peacock green color lake, final yellowish green G (final yellow green G) etc. are arranged.

As orange colorant, red chrome yellow, molybdate orange, permanent orange GTR, pyrazolone orange, fast orange (vulcan orange), indanthrene brilliant orange RK, Benzidine orange G, indanthrene brilliant orange GK, C.I. pigment orange 31 etc. are arranged.

As violet colorant, manganese violet, Fast violet B, methyl violet color lake etc. are arranged.

As white color agents, zinc paste, titanium dioxide, stibium trioxide, zinc sulphide etc. are arranged.

As extender pigment, there are ground barium sulfate, barium carbonate, clay, silicon dioxide, white carbon, talcum, aluminium oxide white etc.In addition, as various dyestuffs such as alkalescence, acidity, dispersion, direct dyess, nigrosine, methylene blue, rose-red, quinoline yellow, ultramarine blue etc. are arranged.

As the example of mineral-type adjuvant, can list that titanium dioxide, zinc paste, zinc sulphide, antimony oxide, lime carbonate, white lead, talcum, silicon dioxide, calcium silicate, aluminium oxide are white, cadmium yellow, cadmium red, cadmium orange, titan yellow, dark purple, ultramarine, cobalt blue, cobalt green, cobalt violet, iron oxide, carbon black, the manganese ferrite is black, the cobalt ferrite is black, copper powder, aluminium powder etc.

These pigment and mineral-type adjuvant can use separately or multiple being used in combination.Wherein, especially as the preferred carbon black of black pigment, as the preferred titanium dioxide of Chinese white.Mix above-mentioned colorant, can make the particle for display medium of desired color.

In addition, particle for display medium of the present invention (below, be also referred to as particle), its mean grain size d (0.5) are preferably in the scope of 1～20 μ m and be evenly distributed.If mean grain size d (0.5) greater than this scope, then lacks the sharpness on showing, if less than this scope, then the aggregation force between the particle becomes excessive, therefore can be to the mobile obstruction of bringing of display medium.

In addition, in the present invention, about each particle grain size distribution, the span of the size distribution shown in the following formula (Span) less than 5, preferred less than 3.

Span＝(d(0.9)-d(0.1))/d(0.5)

(wherein, d (0.5) is the grain diameter value of representing with μ m, 50% bigger in the particle than it, and 50% is littler than it; D (0.1) is the grain diameter value of representing with μ m, and particle diameter is 10% at the ratio of this particle below numerical value; D (0.9) is the grain diameter value of representing with μ m, and particle diameter is 90% at the ratio of this particle below numerical value.)

By span is in the scope below 5, the size of each particle is even, can realize moving uniformly of display medium.

In addition, for the relation of each particle, the d (0.5) that importantly has the particle of minimum diameter in employed particle is below 50, is preferably below 10 with respect to the ratio of the d (0.5) of the particle with maximum gauge.Even if the size distribution span is little, also owing to be that the particle that charged characteristic differs from one another moves each other in the opposite direction, therefore what be fit to is that both sides' particle size is close, and both sides' particle can easily move according to equivalent round about, and this just requires above-mentioned scope.

In addition, above-mentioned size distribution and particle diameter can be tried to achieve by laser diffraction/scattering method etc.If to particle irradiating laser as determination object, then can produce the light intensity distributions pattern of the diffraction/scattered light in space, because there are corresponding relation in this light intensity pattern and particle diameter, therefore can measure particle diameter and size distribution.

At this, particle diameter among the present invention and size distribution are distributed by volume reference and obtain.Specifically, can use Mastersizer2000 (Malvern InstrumentsLtd.) mensuration machine, in stream of nitrogen gas, drop into particle, use subsidiary analysis software (being distributed as the software on basis with the volume reference that adopts the Mie theory), measure particle diameter and size distribution.

The carried charge of particle for display medium obviously depends on its condition determination, the carried charge of the particle for display medium in the Given information display panel depends on the initial strip electric weight substantially, with the contacting of next door, with the contacting of substrate, along with the saturation value of the charged behavior of charge decay, the especially particle for display medium in elapsed time is a determinative.

People of the present invention have carried out the result that studies intensively, discovery is measured the carried charge of the employed particle of display medium by use identical carrier granular in blowing out (blowoff) method, can estimate the scope of the suitable charged characteristic value of particle for display medium.

In addition, in the situation of the dry type information display panel that display medium is applied to drive in the gas space, it is important that the gas of the gap of the encirclement display medium between substrate is managed, and it helps to improve exhibit stabilization.Specifically, for the humidity of the gas of gap, the relative humidity under 25 ℃ is that 60%RH is following, to be preferably below the 50%RH be important.

In (a) and (b)～Fig. 9 of Fig. 1, this gap be meant from the part that is clipped in opposing substrates 1, substrate 2, deduct electrode 5,6 (electrode being arranged under the situation of substrate inboard), display medium 3 occupy part, next door 4 (being provided with under the situation in next door) occupy part, the part (color filter being arranged under the situation of substrate inboard) of color filter 27, gas part hermetic unit, that so-called display medium contacted of information display panel.

The gas of gap is so long as in above-mentioned humidity range, its kind just without limits, what be fit to is dry air, drying nitrogen, dry argon gas, dry helium gas, dry carbon dioxide, dry methane etc.This gas must be enclosed under the condition that keeps its humidity in the information display panel, for example under the humidity environment of regulation, carry out the filling of display medium, the assembling of information display panel etc., in addition, apply in order to prevent that encapsulant, encapsulating method that moisture is invaded from the outside from being important.

Substrate in the information display panel of the present invention and the interval between the substrate as long as display medium can move, can to keep contrast just passable, are adjusted into 10～500 μ m usually, are preferably 10～200 μ m.

The volume occupation rate of display medium is preferably 5～70% in the gas space between the opposing substrates, and more preferably 5～60%.Under 70% the situation of surpassing, to the mobile generation obstacle of display medium, under the situation of less than 5%, it is unintelligible that contrast becomes easily.

Information display panel of the present invention, be applicable to notebook-PC, PDA, portable phone, the display part of removable machine such as portable terminal, e-book, electronic newspaper, electronic guide Electronic Paper such as (operational manuals), billboard, placard, notice boards such as blackboard, desk top computer, household appliances, the display part of Automobile Products etc., point card (point card), the card display part of IC-card etc., e-advertising, electronics POP (Pointof presence, Point of Purchase advertising), the electronics price tag, the electronics inventory tag, electronic music, the display part of RF-ID machine etc., in addition, also be applicable to the information display panel that uses external electrical field to form the member update displayed (so-called can write paper again).

In addition, for the type of drive of information display panel of the present invention, can use various types of type of drive as described below: panel from do not use the simple matrix type of drive or the static drive mode of on-off element on one's body and used with thin film transistor (TFT) (TFT) for three terminal on-off elements of representative or with thin film diode (TFD) as the active matrix drive mode of the both-end sub-switch element of representative, used the external electrical field type of drive of external electrical field formation member etc.

Claims (6)

1. information display panel, it is space between transparent two substrates at least one side, the display medium more than at least a kind that inclosure is made of the particle more than at least a kind with optical reflectivity and charging property, by display medium being applied electric field display medium is moved, thereby information such as display image, it is characterized in that, on the transparency carrier that shows side, the filtrator of arranging the specified color number is set and the color filter that constitutes, carrying out colour shows, at this moment, make following structure: make between the end of filtrator of adjacent different colours overlapping.

2. information display panel according to claim 1, it is characterized in that, the filtrator that color filter is arranged redness (R), green (G), blue (B) constitutes, by 1 display unit of filtrator formation of 1 group of redness (R), green (G), blue (B).

3. information display panel according to claim 1, it is characterized in that, the filtrator that color filter is arranged cyan (C), magenta (M), yellow (Y) constitutes, by 1 display unit of filtrator formation of 1 group of cyan (C), magenta (M), yellow (Y).

4. according to each described information display panel of claim 1～3, it is characterized in that, when the filtrator that makes adjacent different colours is overlapping, make the end of filtrator form opposite mutually stepped of teat, make up stair-stepping end and constitute the plane color filter.

5. according to each described information display panel of claim 1～4, it is characterized in that, make following structure: the display medium more than at least a kind that is sealing into described at least one side and is the space between two transparent substrates is the display medium of white display medium and these two kinds of colors of black display medium, electrode is set respectively on opposing substrates, by the electric field that produces between electrode, display medium is moved along the direction vertical with respect to panel, thus information such as display image.

6. according to 1～5 each described information display panel of claim, it is characterized in that, make following structure: at least one side that will enclose described display medium is the space between transparent two substrates, be divided into the cell space of at least 1 display unit whenever by the next door, on substrate, be provided with the color filter of 3 looks corresponding to this cell.

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