CN102681282A - Multi-color display board and manufacturing method thereof - Google Patents
Multi-color display board and manufacturing method thereof Download PDFInfo
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Abstract
本发明涉及一种多色显示板及其制造方法。该多色显示板是在多色显示的微胶囊型电泳式显示板中，形成重叠现有的黑白微胶囊型电泳式显示板和滤色片的结构，从而可以彩色化，而且可以改善显示亮度低下或视角狭窄化的问题。通过在透明基板上具有滤色片层和透明电极层、而且在上述透明电极层上直接层叠微胶囊层而形成，上述微胶囊层层叠带微胶囊的滤色片和背面电极板，其中带微胶囊的滤色片是将微胶囊分散到粘结剂树脂中形成的，该微胶囊封入了在透明分散介质中分散有电泳粒子的分散液，通过施加电压而引起电场改变来改变光学的反射性质；背面电极板是由在前述微胶囊层上通过粘合剂层，在背面基材上配置像素电极形成的。
The invention relates to a multi-color display panel and a manufacturing method thereof. This multi-color display panel is a microcapsule-type electrophoretic display panel for multi-color display, forming a structure in which an existing black-and-white microcapsule-type electrophoretic display panel and a color filter are overlapped, thereby enabling colorization and improving display brightness Problems with low or narrow viewing angles. It is formed by having a color filter layer and a transparent electrode layer on a transparent substrate, and directly laminating a microcapsule layer on the transparent electrode layer. The color filter of the capsule is formed by dispersing microcapsules into a binder resin. The microcapsules encapsulate a dispersion liquid in which electrophoretic particles are dispersed in a transparent dispersion medium, and the optical reflection properties are changed by applying a voltage to cause a change in the electric field. The back electrode plate is formed by disposing pixel electrodes on the back substrate through the adhesive layer on the aforementioned microcapsule layer.
Description
Technical field
The present invention relates to the microcapsule-type electrophoretic display panel; What relate to is a kind of multicolor displaying panel; This multicolor displaying panel is made up of following structure: in microcapsules, enclose electrophoresis ink; It is between transparent one group of counter electrode plate that these microcapsules are configured in one of them, but further relates to the multicolor displaying plate and the manufacturing approach thereof of multicolor displaying through using color filter.
Background technology
In recent years, along with the development of information equipment, information shows also have various forms.Being CRT (cathode-ray tube (CRT)) and using liquid crystal backlight as the display board main flow of variable information.But CRT and the luminescence type displays such as LCD that use backlight are when long-time the use, and be big to the burden of eyes, looks tired, and is not suitable for the purposes of long-time continuous reading file etc.
In addition, the LCD that does not use type backlight is owing to use polaroid, and image is obviously darker, has the problem of sense of vision difference.In addition, the display image of these displays does not have Memorability, and in the stop supplies electric energy, display image disappears.Even people need long-time the use, the eyes of seeing thing are indefatigability also, and sense of vision is good, and power consumption is few, and has the display of iconic memory property.
Therefore, for example disclosed as the little reflection display device of the burden of eyes as patent documentation 1, a kind of electrophoresis-type display board has been proposed, this display board has a pair of counter electrode and is arranged on this interelectrode electrophoresis-type display layer.The paper of this electrophoresis-type display board and printing likewise passes through reflected light display text or image, thus few to the burden of eyes, be fit to continue for a long time to watch the operation of picture.
This electrophoresis-type display board is based on that principle carries out: on the dispersion liquid of dispersed charged particles, applies voltage and changes electric field, so that charged particle moves, and can display image.In the electrophoresis-type display board, the charged particle after painted is enclosed microcapsules, microcapsules are configured between a pair of counter electrode, formed microcapsule-type electrophoresis-type display board has advantages such as driving voltage is low, high-flexibility, can practical, further exploitation.
Except the display of carry-on information equipments such as so-called PDA (portable information terminal) or e-book; Can be what further popularize from now on: show conversion to display with printed matter such as newspaper or book, magazine, placard and from the hard copy that printer etc. outputs on the paper; At this moment, be suitable for this electrophoresis-type panel.This electrophoresis-type panel generally is to be shown as main two looks demonstration to deceive in vain on the structure, in order to show above-mentioned magazine or chromatograp, requires multicolourization in recent years.
In order to make this electrophoresis-type panel multicolor; The multiple colour electrophoretic particle that uses more than 2 kinds is disclosed; For example be to form pattern in patent documentation 2 through photolithography; In patent documentation 3, except photolithography, also use ink-jet method, electrophoresis particle is configured in the technology in the predetermined pixel.In addition, in patent documentation 4, disclose a kind of display board, this display board is arranged on a plurality of microcapsules on the desirable position through being pre-formed the element framework of taking in microcapsules exactly, thereby can multicolor displaying.But, method and common photoresist etc. that the polychrome microcapsules are configured in the predetermined pixel to be compared, practical situation is that operation is not only much but also more complicated, and technical difficulty is many.
Therefore, in patent documentation 5, delivered through colour filtering chip basic board being fitted on the black and white electrophoresis-type display board, thus make do not need between microcapsules and pixel positional precision can multicolor displaying mode.But; This mode is because the colour filtering chip basic board of fitting and making in addition on as the black and white electrophoresis-type display board of reflection-type display board; So must insert the bonding coat of applying usefulness in the centre; Its display brightness is low thus, and because the applying difficulty of colour filtering chip basic board also has the low problem of productivity.
In addition, owing to have distance between colour filter and electrophoresis laminar display layer,, caused losing the advantage of the Electronic Paper of so-called no viewing angle influence owing to the different colorific vision differences of viewing angle.In order to address the above problem, actual conditions are through making the color filter optimization, attempt to improve display brightness and visual angle, still also can't improving significantly.
[prior art document]
[patent documentation]
The special public clear 50-015115 communique of [patent documentation 1] Japan
[patent documentation 2] TOHKEMY 2002-365668 communique
[patent documentation 3] TOHKEMY 2003-156770 communique
[patent documentation 4] TOHKEMY 2003-295234 communique
[patent documentation 5] TOHKEMY 2003-161964 communique
Summary of the invention
The present invention is based on the problems referred to above proposition; Its problem is to provide a kind of multicolor displaying plate and manufacturing approach thereof; Be in the microcapsule-type electrophoresis-type display board of multicolor displaying; Form the structure of overlapping existing black and white microcapsule-type electrophoresis-type display board and color filter, thus can colorize, and can improve the problem of the low or visual angle stricturization of display brightness.
The invention of technical scheme 1 of the present invention is a kind of multicolor displaying plate; This multicolor displaying plate is the multicolor displaying plate with the sequential cascade formation of transparency carrier, color filter layer, transparent electrode layer, microcapsule layer, adhesive phase, backplate plate; It is characterized in that aforementioned microcapsule layer directly is layered on the aforementioned transparent electrode layer; Aforementioned microcapsule layer constitutes through in resin glue, disperseing microcapsules; Aforementioned microcapsules have been enclosed in transparent dispersion medium the dispersion liquid that disperses electrophoresis particle and form, and change optical reflectance property through applying the electric field change that voltage causes; The aforementioned electric pole plate is the battery lead plate of configuration pixel electrode on the substrate overleaf.
In addition, the invention of technical scheme 2 of the present invention is multicolor displaying plates of being put down in writing according to technical scheme 1, it is characterized in that, aforementioned electrophoresis particle is the particle with 2 kinds of different surface electric charges, and wherein a kind of is colored particles, and another kind is a white particles.
In addition, the invention of technical scheme 3 of the present invention is multicolor displaying plates of being put down in writing according to technical scheme 1, it is characterized in that, is formed with the concavo-convex smooth layer that is used to reduce microcapsules on the aforementioned microcapsule layer.
Then, the invention of technical scheme 4 of the present invention is manufacturing approaches of a kind of multicolor displaying plate, it is characterized in that, comprises at least: the operation that color filter layer (a) is set on transparency carrier; (b) operation of transparent electrode layer is set on aforementioned color filter layer; (c) on aforementioned transparent electrode layer, directly be coated with microcapsule layer to form the operation of microcapsule layer; This microcapsule layer is dispersed in microcapsules and forms in the resin glue; These microcapsules have been enclosed the dispersion liquid that in dispersion medium, is dispersed with electrophoresis particle, change optical reflectance property through applying the electric field change that voltage causes; (d) in the operation of aforementioned microcapsule layer laminated adhesive phase; (e) carry out range upon range of operation through the mode that aforementioned adhesion agent layer is located between aforementioned microcapsule layer and the pixel electrode face, this pixel electrode face is configuration pixel electrode and the pixel electrode face of the backplate plate that forms on the base material overleaf.
In addition, are manufacturing approaches of the multicolor displaying plate put down in writing of technical scheme 4 according to the invention of technical scheme 5 of the present invention, it is characterized in that, further be included in the operation that is formed for reducing the concavo-convex smooth layer of microcapsules printing ink on the aforementioned microcapsule layer.
In addition; According to the invention of technical scheme 6 of the present invention are manufacturing approaches of the multicolor displaying plate put down in writing of technical scheme 4; It is characterized in that; Operation at aforementioned microcapsule layer laminated adhesive phase comprises: be formed with that coating forms bonding agent on the fissility resin substrate of conductive layer, the adhesive sheet that forms is laminated to the stage on the aforementioned microcapsule layer; Then in aforementioned transparent electrode layer and aforementioned conductive layer, apply voltage, estimate the stage of the driving of aforementioned microcapsule layer, before the operation of the pixel electrode face of range upon range of aforementioned backplate plate, peel off, remove the fissility resin substrate that is formed with aforementioned conductive layer.
In multicolor displaying plate of the present invention,, can make as the microcapsule layer of display surface and the distance of color filter layer and very closely dispose through on the transparent electrode layer that is had on the color filter layer, directly forming microcapsule layer.The result is; The existing display board that forms with the colour filtering chip basic board of the manufacturing in addition of fitting is compared; There are not unwanted layers such as bonding agent in structure of the present invention between microcapsule layer and color filter layer; Reflected light by the microcapsule layer reflection passes through MIN layer, and display brightness is higher than aforementioned existing display board.
In addition,, thus, do not observe aforementioned this sight equation, do not cause the narrow of visual angle about the demonstration of observed microcapsule layer and the deviation of color filter also are driving fit microcapsules on color filter layer because the distance of color filter layer and microcapsule layer is separated.
In addition; In multicolor displaying plate of the present invention; Form smooth layer through the only outer resin glue that is coated with microcapsules printing ink on microcapsule layer, minimizing microcapsules printing ink concavo-convex, direct coating adhesive thus; Avoid bonding agent to contact and produce showing bad problem, help to improve reliability and productivity with transparent electrode layer.In addition, owing on microcapsules, apply uniform voltage,, improved the quality that image shows so show inequality.
In addition; Manufacturing approach according to multicolor displaying plate of the present invention; In the operation of microcapsule layer laminated adhesive phase, before manufacturing, can estimate the driving of microcapsule layer as final multicolor displaying plate; Can be described as also is being suitable scheme aspect the quality affirmation; This final multicolor displaying plate is being formed with the adhesive sheet that coating adhesive forms on the fissility resin substrate of conductive layer through using, and is range upon range of and obtain with TFT (Thin film transistor, thin film transistor (TFT)) substrate etc.
Description of drawings
Fig. 1: the sketch of the structure of the multicolor displaying plate through cross sectional illustration one embodiment of the invention.
Fig. 2: the mode chart of the structure of the multicolor displaying plate through the cross sectional illustration one embodiment of the invention of amplifying.
Fig. 3: the sketch of panel construction example of middle operation that the manufacturing approach of multicolor displaying plate of the present invention is described.
Fig. 4 (a) and Fig. 4 (b): the sketch of the structure through the existing multicolor displaying plate of cross sectional illustration.
Embodiment
Based on an embodiment, multicolor displaying plate of the present invention and manufacturing approach thereof are carried out following explanation in detail.
Fig. 1 is the sketch through the structure example of the multicolor displaying plate of cross sectional illustration one embodiment of the invention, and Fig. 2 is the mode chart that the section through its amplification describes.As depicted in figs. 1 and 2; Multicolor displaying plate of the present invention is on transparency carrier 1, to have color filter layer 2 and transparent electrode layer 4; And the cross-section structure of the color filter of range upon range of band microcapsules and backplate plate; Wherein the color filter direct range upon range of microcapsule layer 10 on aforementioned transparent electrode layer 4 with microcapsules forms, and microcapsule layer 10 is distributed to microcapsules 5 in the resin glue 11 and forms, and microcapsules 5 are to enclose the dispersion liquid that in transparent dispersion medium, has disperseed electrophoresis particle is arranged; Change electric field through applying voltage, change the microcapsules of the reflectivity properties of optics; The backplate plate is to be formed by the back side base material 50 through adhesive phase 16 configuration pixel electrodes 30 on aforementioned microcapsule layer 10.
In addition, though diagram not, as required, can on microcapsule layer 10, be provided for reducing microcapsules 5 concavo-convex outside be coated with the surface smoothing layer of resin glue.
As transparency carrier 1, can use resin plates such as glass plate such as soda-lime glass, low alkali borosilicate glass, alkali-free alumina borosilicate glass or polyethylene terephthalate (PET) and polycarbonate, polyimide, PEN, polyethersulfone, acryl resin, PVC.
In multicolor displaying plate of the present invention; The graphics shape of color filter layer 2 does not have special qualification; Can suitably use suitable shape; For example the parallel or cross-over configuration ground formation with the filter section (filter segment) of meticulous band (striped) shape perhaps constitutes meticulous filter section with certain in length and breadth array configurations.In the color filter layer 2 that uses among the present invention a plurality of colored patterns are set, image-region disposes colored pixels respectively.Colored pixels is on each pixel that transmitted light is painted, and general assortment is equivalent to the trichromatic redness (R) of light, green (G), blue (B) these three kinds of colors, the perhaps colored pixels of 3 primary colors of yellow (Y), pinkish red (M), cyan (C).
General following the carrying out of the manufacturing of this color filter layer: will on photoresist, disperse to sneak into the coloring phototonus resin of colorants formation such as pigment or dyestuff or transparent photoresist; On glass substrate, be coated with to homogeneous thickness through spin-coating method or irrotationality rubbing method, after drying is removed remaining solvent, through photolithography to the photomask of this etchant resist with institute's desirable shape; Through proximity exposure (near exposure) etc.; Use extra-high-pressure mercury vapour lamp irradiation active energy ray, solidify (minus) or improve alkali solubility (eurymeric), remove the part of dissolvings such as aqueous slkali; Develop thus, after cure, repeat this operation of necessary amount.In addition, in the present invention, above-mentioned manufacturing approach does not have special qualification.
Then, on the color filter layer 2 as required with surface grinding, leveling after, transparent electrode layer 4 is set.Can be used as the material that transparent electrode material uses, for example is the such electroconductive oxide with transparency of indium oxide system such as ITO, Sn system, Zinc oxide etc.This transparency electrode can use prior aries such as vapour deposition method, sputtering method, CVD method to form.
Below, the displaying principle of the color filter of the band microcapsules that constitute multicolor displaying plate of the present invention is carried out summary description.
As shown in Figure 2, the pixel electrode of back side base material 50 30 connects the on-off element (not shown) of each pixel electrodes, can between itself and transparent electrode layer 4, apply positive and negative voltage.For display image, usually, pixel electrode 30 connects the power supply of the circuit structure of active array type type of drive.If on pixel electrode 30, apply voltage, then be applied to the electric field change on the microcapsule layer 10.When pixel electrode 30 was positive pole, the electronegative particle in the microcapsules 5 was toward pixel electrode 30 side shiftings at the back side, and the particle of positively charged moves to transparent electrode layer 4 sides of front.Likewise, if pixel electrode 30 is a negative pole, then the particle of positively charged moves to the pixel electrode side, and electronegative particle is toward transparent electrode layer 4 side shiftings.Here; For example hypothesis makes the black particles positively charged in advance; White particles is electronegative, and then Show Color is the color of the particle of transparent electrode layer 4 side shiftings forward, reflects above that from the light of observing side; Reflected light can be with color ground to show desirable literal or image through the colored pattern of the color filter layer of subtend thus.
Then, further specify material, the parts that multicolor displaying plate of the present invention uses.
The microcapsules 5 that the color filter of band microcapsules uses when forming are made up of colored particles 6, white particles 7, transparent dispersion medium 8 and microcapsule shell 9.
In general; The microcapsules that use in the microcapsule-type electrophoresis-type display board are refining through sieve method or density separation etc., and mean grain size is 30～100 μ m, in addition; With respect to the mean grain size of capsule, 10 μ m surpass 50% at least with the ratio of the microcapsules of interior particle diameter before and after having.The microcapsules that use in the multicolor displaying plate of the present invention are also identical.
Micro-capsule dispersion liquid uses water solvents such as alcohol, if there is not special problem, makes water.
As transparent dispersion medium 8,, select in the just water-fast basically organic solvent from can well, stably having the insulativity liquid of charged particle.For example, use aliphatic hydrocarbon, aromatic hydrocarbons, alicyclic hydrocarbon, halogenated hydrocarbons, various ester class, pure series solvent or other fat etc. to mix the solvent that forms separately or suitably.
Except inorganic carbon etc. the inorganic pigment, also use fine powders such as glass or resin in the colored particles 6, and their complex etc.In addition, the multicolor displaying plate of the present invention that carries out multicolor displaying by color filter uses the black particles of carbon black usually.
Use white inorganic pigments such as known titanium dioxide, silicon dioxide, aluminium oxide, zinc paste as white particles 7, organic compounds such as vinyl acetate emulsion fluid, and their complex etc.
In addition; Colored particles 6 and white particles 7 as required can be through using various surfactants, spreading agent, organic and surface that mineral compound, metal etc. are handled particles; Not only desirable surface charge can be given, and the dispersion stabilization in the transparent dispersion medium 8 can be improved.
The dispersion liquid A that colored particles 6 and white particles 7 are distributed in the transparent dispersion medium 8 uses known method such as phase separation methods such as mixing coacervation, surface aggregate method, in-situ polymerization (in-situ) method, dissolving dispersion cooling method to enclose in the microcapsules.The shell 9 of microcapsules for example is the film of rubber or gelatin.
Disperseed to mix thickening agent, surfactant and resin glue 11 etc. in the micro-capsule dispersion liquid of the different microcapsules of refining size distribution allotment microcapsules printing ink.
Resin glue 11 at microcapsules printing ink uses dielectric resins such as PLA, phenolics, acrylic resin, acryl resin, urethane resin.
In addition, behind the microcapsules printing ink of allotment more than 2 kinds, when they are mixed, change in order to prevent mixed ink density, with the Auto-regulating System of Density of Heavy Medium of the printing ink that mixes for equal.
The microcapsule layer 10 of formation as above-mentioned is concavo-convex owing to the surface has, so be difficult to make the interelectrode distance of clamping microcapsules certain.Therefore, can be on microcapsule layer 10 coating surface smoothing printing ink, form the surface smoothing layer.Through forming this surface smoothing layer, can bonding agent directly be coated on the surface smoothing layer.This can be avoided following problems: the direct coating adhesive if there is not the surface smoothing layer; On microcapsule layer 10, have uncoated positions such as pin hole; Then bonding agent directly contacts the transparent electrode layer 4 of color filter side; Conductivity variations is difficult on microcapsules, apply voltage, consequently shows unclear.
Surface smoothing carburetion China ink is in solvent, to disperse to form as the resin of cementing agent.As the cementing agent composition be preferably with microcapsules printing ink in the identical resin of cementing agent composition specific inductive capacity that uses in the resin glue composition that uses or the adhesive phase.Particularly, most preferably with microcapsules printing ink, adhesive phase in the resin glue composition that uses identical, and identical with the resin glue composition of surface smoothing carburetion China ink.
If use the different resin of specific inductive capacity, the then different resin of range upon range of specific inductive capacity between electrode, and the thickness of each resin forms different state according to the size at the microcapsules that this part had.If like this, then because the specific inductive capacity of each resin is different, being applied to voltage on the microcapsules, to be difficult at whole picture areas be uniform.
Solvent as surface smoothing carburetion China ink can use those that use in the microcapsules printing ink, also can use aqueous solvents such as other alcohol.
Apparatus for coating coatings such as curtain formula spreader, slit die coating machine are used in the coating of surface smoothing carburetion China ink.The coating method of cut-out coating fluids such as scraper coating is owing to the microcapsules rupture that makes in the microcapsule layer, so can not use.
The thickness of surface smoothing layer is preferably 10～30 μ m.When 10 μ m are following, the uneven cunning of surface of microcapsule.On the other hand, when 30 μ m were above, interelectrode distance was wide, became the reason that driving voltage raises.
As above form the surface smoothing layer, solvent is fully evaporated, form the color filter of band microcapsules thus.The color filter of these band microcapsules and base material overleaf dispose the backplate plate of pixel electrode; Make the colored pattern (pixel) of color filter and the pixel electrode position of backplate overlap the ground applying through adhesive layer; Carry out range upon range of, thereby accomplish electrophoretic multi-color display board of the present invention.
Can be used as material that cementing agent uses, to be preferably urethane resin be that synthetic resin such as cementing agent, acrylic resin cementing agent are cementing agent.The preferred especially cementing agent that uses high dielectric resin.
Cementing agent can also be coated directly onto on above-mentioned microcapsule layer or the pixel electrode; In manufacturing approach of the present invention, the resin that preferably between silicon fiml and resin substrate, forms conductive layer peel off coating on the substrate used with aforementioned microcapsules printing ink in the bonding agent of the same composition of the resin glue that uses be suitable for as adhesive sheet.Through use and microcapsules printing ink in the resin glue that uses with the bonding agent of sample ingredient; Can enumerate following advantage: the compatibility that improves resin boundary surface; Be difficult to produce and peel off, and because specific inductive capacity is similar, so the voltage that is applied on the microcapsules is certain in face easily.
In addition; Peel off substrate through using the resin that between silicon fiml and resin substrate, forms conductive layer; Can form multilager base plate at the above-mentioned adhesive sheet of color filter laminated of being with microcapsules, the front panel of promptly so-called color filter electrophoresis showed mode drives evaluation, quality is confirmed.In addition, the conductive layer here is owing to need not be transparent, thus can be the film that vapor deposition, electro-deposition form metals such as copper, aluminium, and coating forms the film of electric conductive polymer.
[embodiment]
Below, specific embodiment of the present invention is described.
< embodiment 1 >
To use titanium dioxide powder (white particles) and the hydrocarbon black powder (black particles) through alkyl trimethylammonium chloride surface-treated mean grain size 4 μ m of the mean grain size 3 μ m of polyvinyl resin covering surfaces in the zellon of transparent dispersion medium, to disperse, obtain dispersion liquid A.In this case, white particles is electronegative, the black particles positively charged.
Then, dissolving gelatin and kayexalate in water, the preparation WS and dispersion liquid A mix, the liquid temperature is adjusted to 40 ℃ after, keep liquid temperature on one side, Yi Bian pass through the homogenizer stirring, obtain O/W emulsion fluid.
Then; Use decollator to mix down the O/W emulsion fluid that obtains and the WS that in water, dissolved gum arabic at 40 ℃; On one side the liquid temperature being maintained 40 ℃, Yi Bian use acetic acid, is 4 with the pH regulator of solution; Through complex coacervation, forming with the gelatin-Arabic gum is the microcapsules of shell material.
Then, the liquid temperature is reduced to 5 ℃ after, add 37 quality % formalin solutions, the wall material of microcapsule shell is solidified, obtained enclosing the microcapsules of the dispersion liquid A of dispersion white particles (Titanium particles) and black particles (carbon black particle).
The microcapsules that obtain like this of screening are 60 μ m with mean grain size, and the ratio of the microcapsules of the particle diameter of 50～70 μ m is that mode more than 50% makes size even.
Then, so that the microcapsules of above-mentioned size after evenly are solid constituent, regulate the aqueous dispersions of the microcapsules of solid constituent 40 quality %.Polyurethane series cementing agent (CP-7050, Dainippon Ink Chemicals make), surfactant, thickening agent and the pure water of this aqueous dispersions, solid constituent 25 quality % are mixed, make microcapsules printing ink.
On the other hand, make color filter through following method.Part described here all is a mass parts.At first, be solvent with the cyclohexanone, make 50 parts of butyl methacrylates, 20 parts of methyl methacrylates, 30 parts of acrylic acid copolymers, make acryl resin.
To 25 parts of this acryl resins, be that 47 parts ratio is made acrylic resin soln with solvent, mix 20 parts of red pigments (Pigment Red 22) therein, disperseed 1 hour through the pearl mill.Afterwards, mix 4 parts of dipentaerythritols as photo-sensitive monomer, 4 part of six acrylic ester and, prepare red photo-induced corrosion resistant material through decollator again as 0.3 part of two (2,4, the 6-trimethylbenzoyl)-phenylphosphine oxide of Photoepolymerizationinitiater initiater.
Should be spun on the transparent glass substrate by the redness photo-induced corrosion resistant material, placed at normal temperatures 5 minutes, make the film surface smoothing after, 70 ℃ dry 20 minutes down, form red photoresist layer.
Then, driving fit photomask on this redness photoresist layer, this photomask are to repeat to form through the light shielding part that clips transverse direction 280 μ m with the exposure portion candy strip of indulging 100mm * horizontal 110 μ m, through extra-high-pressure mercury vapour lamp, with exposure 150mJ/cm
2Condition driving fit exposure.
After the exposure, with ejection pressure 1Kg/cm
2Spray 1% aqueous sodium carbonate of 20 ℃ of vaporific temperature, carry out 20 second spray development, remove unexposed position, expose glass substrate.
After the glass substrate drying after the development treatment, heated 1 hour down at 230 ℃, carry out solid film and handle, obtain the red pattern of thickness 1.1 μ m.
Then, forming on the glass substrate of this red pattern, use viridine green (PigmentGreen7) as color material, cause resist with aforementioned red light and equally make green photo-induced corrosion resistant material with forming, use this material to form green photoresist layer.
Then, will with aforementioned same photomask, be arranged on from the position that forms red pattern toward the position that X direction moves 130 μ m, with exposure 200mJ/cm
2Condition driving fit exposure.
After the exposure, with ejection pressure 1Kg/cm
2Spray 1% aqueous sodium carbonate of 20 ℃ of vaporific temperature, carry out 30 second spray development, remove unexposed position, expose glass substrate.
With after the glass substrate drying after the development treatment and likewise aforementioned, 230 ℃ of heating 1 hour down, carry out solid film and handle, obtain the green pattern of thickness 1.2 μ m.
Then and likewise aforementioned, use blue pigment (Pigment Blue 15:6), to make blue photo-induced corrosion resistant material, obtain the blue pattern of thickness 1.1 μ m as color material.
Like this, on glass substrate, form the colored pattern of 3 kinds of colors, on whole of the color filter layer that forms like this, form the transparent electrode layer that constitutes by ITO through sputtering method.
Then, use the slit die coating machine, the aforementioned microcapsules printing ink of coating on the transparent electrode layer of the substrate that has color filter layer and transparent electrode layer on the aforementioned transparent glass substrate, after the coating, drying is 10 minutes under 60 ℃, obtains the color filter with microcapsules.
Then; On the microcapsule layer of the color filter of above-mentioned band microcapsules; Use the slit die coating machine, the polyurethane series cementing agent of overlapping applying solid composition 25 quality % (CP-7050, Dainippon Ink Chemicals makes) is used printing ink as surface smoothingization; Carry out drying, obtain having the band microcapsules color filter of surface smoothing layer.
In addition, the thick aluminium of vapor deposition 100nm on one side then, is provided with silicon above that and is the release-coated face side of the thick polyethylene terephthalate sheet of 50 μ m of release coating, and being coated with the thick polyester-polyurethane of 25 μ m is bonding agent, regulates adhesive sheet.
Then, on the color filter of the band microcapsules of above-mentioned belt surface smoothing layer, the above-mentioned bonding sheet of fitting obtains color filter electrophoresis showed mode front panel.Then; Staying polyester-polyurethane is bonding agent; Peel off and be provided with the thick polyethylene terephthalate sheet of 50 μ m that silicon is release coating,, the pixel electrode face of backplate plate is fitted with the pressure of 0.50MP with the telltale mark coincidence of color filter; Obtain multicolor displaying plate as the microcapsule-type electrophoretic display panel of band color filter of the present invention; This backplate plate has pixel electrode on the glass substrate as the TFT substrate, this pixel electrode is made up of the ITO of the circuit structure of the active array type type of drive of using thin film transistor (TFT) to form.
< comparative example 1 >
On the ITO coated face of the thick polyethylene terephthalate sheet (PET) 41 of 50 μ m of the transparent electrode layer 4 that simultaneously is provided with ITO; Use the same microcapsules printing ink that uses among coating of slit die coating machine and the embodiment 1; After the coating, obtained the microcapsule-type electrophoresis layer down in dry 10 minutes at 60 ℃.On this microcapsule-type electrophoresis layer; With embodiment 1 the surface smoothing layer is set likewise; Use the adhesive sheet same,, obtain the microcapsule-type electrophoretic display panel the pressure applying of the pixel electrode face of backplate plate with 0.50MP with embodiment 1; This backplate plate has pixel electrode on the glass substrate as the TFT substrate, this pixel electrode is made up of the ITO of the circuit structure of the active array type type of drive of using thin film transistor (TFT) to form.Then, use the adhesive sheet same with embodiment 1, the color filter layer of the colored pattern of formation 3 looks on glass substrate that embodiment 1 is made carries out following operation, obtains the microcapsule-type electrophoretic display panel of the band color filter of comparative example 1.Wherein, overlap at the telltale mark of polyethylene terephthalate sheet side, with the TFT baseplate-laminating that uses among the embodiment 1 with color filter.
< comparative example 2 >
Overleaf on the pixel electrode face of battery lead plate; The same microcapsules printing ink that uses coating of slit die coating machine and embodiment 1 to use; This backplate plate has pixel electrode on the glass substrate as the TFT substrate, this pixel electrode is made up of the ITO of the circuit structure of the active array type type of drive of using thin film transistor (TFT), after the coating; Drying is 10 minutes under 60 ℃, obtains the microcapsule-type electrophoresis layer that is integrally formed with the TFT substrate.On the microcapsule-type electrophoresis layer that this and TFT substrate are integrally formed; With embodiment 1 the surface smoothing layer is set likewise; Then, use the adhesive sheet same, the transparent electrode layer one side applying of the substrate of making at embodiment 1 with embodiment 1; Obtain the microcapsule-type electrophoretic display panel of the band color filter of comparative example 2, this substrate has color filter layer and transparent electrode layer on transparent glass substrate.
By normal voltage electric current-producing device (Yokogawa Motor (Co., Ltd.) manufacturing), on the display board of the embodiment that makes 1 and comparative example 1 and 2, apply the voltage of pact ± 15V between pixel electrode, evaluation actual displayed character to the transparency electrode of front and the back side.In addition; Use color colour difference meter CR-400 (コ ニ カ ミ ノ Le タ manufactured); Reflectivity evaluation contrast when the reflectivity when (when white shows) is with black display when measuring colored demonstration the, the reflectivity of when white () during with contrast=colour/black display.Then, measure visual brightness L with same apparatus
*
The result is that the distance of transparent electrode layer and pixel electrode layer of display board of embodiment 1 and comparative example 1,2 is substantially the same; Black particles in the microcapsules and white particles are when applying voltage arbitrarily; All be according to the moving of electric field differently, realize multicolor displaying with identical slightly contrast towards mutual between two electrodes.Yet the display board of comparative example 1,2 is compared with the display board of embodiment 1, and the distance of color filter layer and microcapsule layer becomes big, and because the optical heterogeneity of PET film and adhesive phase, visual angle departs from from the front, therefore causes the low result of display brightness.In addition; The display board of comparative example 1,2 produces very big misalignment when front and transverse observation, obviously produce the angle trend that diminishes; But the multicolor displaying plate of the present invention of embodiment 1 can also improve the color parallax that visual angle causes, can obtain excellent Show Color.
Symbol description
17 ... Peel ply
18 ... Conductive layer
19 ... Peel off base material
20 ... Adhesive sheet
Claims (6)
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| CN2011100706016A CN102681282A (en) | 2011-03-17 | 2011-03-17 | Multi-color display board and manufacturing method thereof |
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| CN2011100706016A CN102681282A (en) | 2011-03-17 | 2011-03-17 | Multi-color display board and manufacturing method thereof |
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