JPH02223932A - Electrophoretic display device and dispersion system for display and production of dispersion system - Google Patents
Electrophoretic display device and dispersion system for display and production of dispersion systemInfo
- Publication number
- JPH02223932A JPH02223932A JP4360789A JP4360789A JPH02223932A JP H02223932 A JPH02223932 A JP H02223932A JP 4360789 A JP4360789 A JP 4360789A JP 4360789 A JP4360789 A JP 4360789A JP H02223932 A JPH02223932 A JP H02223932A
- Authority
- JP
- Japan
- Prior art keywords
- dispersion system
- titanium oxide
- display
- electrophoretic particles
- electrophoretic
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000006185 dispersion Substances 0.000 title claims abstract description 51
- 238000004519 manufacturing process Methods 0.000 title claims description 7
- 239000002245 particle Substances 0.000 claims abstract description 41
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims abstract description 39
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims abstract description 38
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims abstract description 26
- 238000004381 surface treatment Methods 0.000 claims abstract description 18
- 238000004040 coloring Methods 0.000 claims abstract description 8
- 238000010438 heat treatment Methods 0.000 claims abstract description 7
- 230000003287 optical effect Effects 0.000 claims description 5
- 238000009826 distribution Methods 0.000 claims description 4
- 238000000034 method Methods 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 238000002845 discoloration Methods 0.000 abstract description 22
- 239000002612 dispersion medium Substances 0.000 abstract description 11
- 239000007788 liquid Substances 0.000 abstract description 8
- 230000003197 catalytic effect Effects 0.000 abstract description 5
- 238000011282 treatment Methods 0.000 abstract description 3
- 229910052782 aluminium Inorganic materials 0.000 abstract description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 2
- 230000003247 decreasing effect Effects 0.000 abstract description 2
- 239000011248 coating agent Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 abstract 1
- 238000001962 electrophoresis Methods 0.000 abstract 1
- 239000000975 dye Substances 0.000 description 13
- 230000000052 comparative effect Effects 0.000 description 7
- 239000000203 mixture Substances 0.000 description 6
- 238000009472 formulation Methods 0.000 description 5
- 239000011521 glass Substances 0.000 description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 230000021736 acetylation Effects 0.000 description 1
- 238000006640 acetylation reaction Methods 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000001476 alcoholic effect Effects 0.000 description 1
- -1 alicyclic hydrocarbons Chemical class 0.000 description 1
- 150000001338 aliphatic hydrocarbons Chemical class 0.000 description 1
- 150000004945 aromatic hydrocarbons Chemical class 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000001045 blue dye Substances 0.000 description 1
- 239000001273 butane Substances 0.000 description 1
- 235000014121 butter Nutrition 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000004649 discoloration prevention Methods 0.000 description 1
- 239000000986 disperse dye Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 150000008282 halocarbons Chemical class 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- AMGQUBHHOARCQH-UHFFFAOYSA-N indium;oxotin Chemical compound [In].[Sn]=O AMGQUBHHOARCQH-UHFFFAOYSA-N 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 239000001023 inorganic pigment Substances 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000012860 organic pigment Substances 0.000 description 1
- SOQBVABWOPYFQZ-UHFFFAOYSA-N oxygen(2-);titanium(4+) Chemical class [O-2].[O-2].[Ti+4] SOQBVABWOPYFQZ-UHFFFAOYSA-N 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004094 surface-active agent Substances 0.000 description 1
- 238000003786 synthesis reaction Methods 0.000 description 1
Landscapes
- Electrochromic Elements, Electrophoresis, Or Variable Reflection Or Absorption Elements (AREA)
- Devices For Indicating Variable Information By Combining Individual Elements (AREA)
Abstract
Description
【発明の詳細な説明】
「産業上の利用分野」
本発明は電気泳動粒子を利用した表示装置及び表示用分
散系並びにその分散系の製造法に関する。DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to a display device and a dispersion system for display using electrophoretic particles, and a method for producing the dispersion system.
更に具体的には、電気泳動粒子として酸化チタンを使用
する表示用分散系の問題である着色染料の変色を防止す
る為に、酸化チタンに対して所要量のアルミナ表面処理
を施したものを使用することにより、染料の変色防止な
ど耐光性の向上を図れるようにした電気泳動表示装置及
び表示用分散系並びにその分散系の製造法に関する。More specifically, in order to prevent discoloration of coloring dyes, which is a problem with display dispersions that use titanium oxide as electrophoretic particles, titanium oxide is treated with the required amount of alumina surface treatment. The present invention relates to an electrophoretic display device, a dispersion system for display, and a method for producing the dispersion system, which can thereby improve light resistance such as preventing discoloration of dyes.
［従来技術及びその問題点」
この種の電気泳動表示装置は、少なくとも一方が透明な
対向配置した一組の電極機間に液体分散媒に電気泳動粒
子を分散させた分散系を封入し、上記電極板の極性に応
じて分散媒中の電気泳動粒子を透明電極板側に吸着又は
離反させ得るように該極性を制御しながら、所望の文字
、記号或いは図形等を表示可能に構成したものである。[Prior art and its problems] This type of electrophoretic display device has a dispersion system in which electrophoretic particles are dispersed in a liquid dispersion medium sealed between a pair of opposing electrode machines, at least one of which is transparent. The polarity is controlled so that electrophoretic particles in the dispersion medium can be adsorbed or separated from the transparent electrode plate depending on the polarity of the electrode plate, and desired characters, symbols, figures, etc. can be displayed. be.
斯かる電気泳動表示装置の分散系に使用される分散媒と
しては、芳香族炭化水素、脂肪族炭化水素、脂環族炭化
水素、各種エステル類、アルコール系溶媒、ハロゲン化
炭化水素若しくはその他の種々の油等を単独又は適宜混
合したものが一般的なものとして用いられている。また
、電気泳動粒子には、白色物として酸化チタンや硫酸バ
リウム等が、そして、黄色物として上記の如き無機顔料
の他、幾つかの有機顔料等が隠蔽力の観点から優れたも
のとみられている。Examples of the dispersion medium used in the dispersion system of such an electrophoretic display device include aromatic hydrocarbons, aliphatic hydrocarbons, alicyclic hydrocarbons, various esters, alcoholic solvents, halogenated hydrocarbons, and others. These oils are commonly used alone or in a suitable mixture. Furthermore, for electrophoretic particles, titanium oxide, barium sulfate, etc. are used as white materials, and in addition to the above-mentioned inorganic pigments as yellow materials, some organic pigments are considered to be excellent from the viewpoint of hiding power. There is.
更に、電気泳動粒子の色とのコントラストを確保する上
で液体分散媒を種々の色に染める為に、油溶性染料や分
散染料等が使用される。また、液体分散媒を着色しない
場合には、二種類の反対電荷を持つ電気泳動粒子を使用
するものもある。Furthermore, oil-soluble dyes, disperse dyes, and the like are used to dye the liquid dispersion medium in various colors to ensure contrast with the color of the electrophoretic particles. Furthermore, when the liquid dispersion medium is not colored, electrophoretic particles having two types of opposite charges may be used.
なお、電気泳動粒子の分散性改善、該泳動粒子の泳動性
即ち表示性の向上化或いは表示装置としての長期寿命を
確保する手段として、種々の界面活性剤や各種添加剤を
分散系に添加される。In addition, various surfactants and various additives are added to the dispersion system as a means of improving the dispersibility of electrophoretic particles, improving the electrophoretic properties of electrophoretic particles, that is, displayability, or ensuring a long life as a display device. Ru.
斯かる分散系を使用するこの種の電気泳動表示装置は、
第３図に示すように、対向面に各々酸化インジウム・ス
ズ等の適宜な透明導電部材を使用して所要の表示用電極
パターン２．４を各別に形成した二枚の透明ガラス板１
．３を設け、液体分散媒に電気泳動粒子６を分散させた
分散系７をその・対向間隙間に封入すべくスペーサ兼用
の封止部材５を外周部位に配装した構造を有する。
′このような表示装置は、電極パターン２．４に表示
駆動用電圧を印加して電気泳動粒子６を電極パターン２
．４に吸着・離反させ得るように分散系７に電界瘉作用
させて電気泳動粒子６の分布状態を変えることにより分
散系７の光学的特性に変化を与えて所望の表示動作を行
なわせるものである。This type of electrophoretic display device using such a dispersion system is
As shown in FIG. 3, two transparent glass plates 1 each have a required display electrode pattern 2.4 formed on their opposing surfaces using a suitable transparent conductive material such as indium tin oxide.
．． 3, and a sealing member 5 which also serves as a spacer is disposed on the outer periphery of the dispersion medium in order to encapsulate a dispersion system 7 in which electrophoretic particles 6 are dispersed in a liquid dispersion medium in the gap between the opposite sides.
'Such a display device applies a display driving voltage to the electrode pattern 2.4 to move the electrophoretic particles 6 onto the electrode pattern 2.
．． By applying an electric field to the dispersion system 7 to change the distribution state of the electrophoretic particles 6 so that the electrophoretic particles 6 can be adsorbed and detached from the electrophoretic particles 4, the optical characteristics of the dispersion system 7 are changed to perform a desired display operation. be.
このような電気泳動表示装置は、分散系の光学的特性の
変化を利用するものであるから、室外では太陽光の、室
内では蛍光灯等の光の反射を利用することになるが、電
気泳動粒子に酸化チタンを使用した場合には、酸化チタ
ンの触媒作用に起因するとみられる液体分散媒の着色用
染料の変色を生ずるという大きな問題が判明した。斯か
る染料変色の問題は、可視光、紫外光のいずれでも発生
し、殊に紫外光による変色度合が高い。Such electrophoretic display devices utilize changes in the optical properties of a dispersion system, so they use sunlight outdoors and the reflection of fluorescent light indoors. When titanium oxide was used for the particles, a major problem was found in that the coloring dye of the liquid dispersion medium changed color, which was thought to be caused by the catalytic action of titanium oxide. This problem of dye discoloration occurs with both visible light and ultraviolet light, and the degree of discoloration caused by ultraviolet light is particularly high.
「発明の目的及び構成」
本発明は、電気泳動粒子としてアルミナ表面処理を施し
た酸化チタンを使用しこれを熱処理することにより既述
の如き液体分散媒の染料変色の問題を解消することの可
能な電気泳動表示用分散系を具備する表示装置及びその
表示用分散系の製造法を提供するものである。``Object and Structure of the Invention'' The present invention is capable of solving the above-mentioned problem of dye discoloration of a liquid dispersion medium by using titanium oxide with alumina surface treatment as electrophoretic particles and heat-treating the particles. The present invention provides a display device equipped with an electrophoretic display dispersion system and a method for manufacturing the display dispersion system.
その為に本発明に係る電気泳動表示装置では、液体分散
媒にアルミナ表面処理を施し熱処理した酸化チタンと着
色用染料とを分散させることにより表示用分散系を構成
することを特徴とするものである。For this reason, the electrophoretic display device according to the present invention is characterized in that a display dispersion system is constructed by dispersing titanium oxide, which has been subjected to alumina surface treatment and heat treatment, and a coloring dye in a liquid dispersion medium. be.
斯かる表示用分散系は、７重量％以上のアルミナ表面処
理を施した酸化チタンと着色用染料とを調合して作製さ
れ、電気泳動粒子としてのアルミす表面処理済み酸化チ
タンは、表示用分散系の調合前に含有水分の除去の目的
で、１５０’Ｃの温度で２時間以上加熱処理するのが好
適である。酸化チタンに対する斯かる処理によって、酸
化チタン自体の触媒作用を抑制して染料の変色防止乃至
は変色速度の低減を確保するものである。Such a display dispersion system is prepared by blending 7% by weight or more of alumina surface-treated titanium oxide and a coloring dye, and the aluminum surface-treated titanium oxide as electrophoretic particles is used as a display dispersion system. It is preferable to heat the system at a temperature of 150'C for 2 hours or more in order to remove moisture content before preparing the system. Such treatment of titanium oxide suppresses the catalytic action of titanium oxide itself, thereby ensuring prevention of discoloration of the dye or reduction of discoloration speed.
「実 施 例」
先ず第一の比較例として、以下の配合からなる分散系は
、アルミナ表面処理を全く施さない酸化チタンを電気泳
動粒子として使用した場合であって、この配合成分を１
２時間ボールミルで分散させて得た分散系を従前の如き
ＩＴＯガラス電極板間に封入して構成した電気泳動表示
装置に於ける紫外線照射による変色の度合を調べた。``Example'' First, as a first comparative example, a dispersion system consisting of the following formulation is a case where titanium oxide without any alumina surface treatment is used as electrophoretic particles, and this formulation component is
The degree of discoloration caused by ultraviolet irradiation in an electrophoretic display device constructed by enclosing a dispersion obtained by dispersing in a ball mill for 2 hours between conventional ITO glass electrode plates was investigated.
第１図はその結果を示すもので、横軸は高圧水銀灯によ
る紫外線照射エネルギー ｆｍＪ／ｃｍ２）を対数値で
示し、また、縦軸は輝度 （Ｃｄ７ｍ勺を示す。Figure 1 shows the results, where the horizontal axis shows the ultraviolet irradiation energy (fmJ/cm2) from a high-pressure mercury lamp in logarithmic value, and the vertical axis shows the luminance (Cd7m).
そして、変色の表現にはオフ表示の状態、即ち、電気泳
動粒子を表示側電極と逆の電極に寄せた時のＸ、Ｙ、Ｚ
ｒ２度を用いた。The color change is expressed by the off-display state, that is, when the electrophoretic particles are brought to the electrode opposite to the display side electrode.
r2 degrees was used.
［比較例１の分散系配合１
上記に於いて、未処理酸化チタンは帝国化工（摺装の６
００Ｂを、また、油溶性青染料は中央合成（摺装の０Ｂ
ＢＡを各々用いた。[Dispersion Formulation 1 of Comparative Example 1] In the above, untreated titanium oxide was manufactured by Teikoku Kako Co., Ltd.
00B, and the oil-soluble blue dye is Chuo Synthesis (Suriso's 0B).
BA was used in each case.
第１図のとおり、アルミナ表面処理を全く施さない未処
理酸化チタンを使用した上記配合ではＺ輝度の低下が著
しく、照射エネルギー２．５Ｘ１０３ｍＪ／ｃｍ”で黒
色に変色し、更に７．２Ｘ １０’ ｍＪ／ａｍ２で緑
色に、そして、最終的には３．５ｘ １０’ ｍＪ／ｃ
ｍ”で黄色に変色した。 従って、第１図のｘ、ｙ、ｚ
輝度の変色に伴う変化から変色の程度をみるにはＺｒ１
度の変化を辿れば十分であるので、以下ではｚｉ度変化
のみを示す。As shown in Figure 1, in the above formulation using untreated titanium oxide without any alumina surface treatment, the Z brightness decreased significantly, and the color changed to black at an irradiation energy of 2.5 x 103 mJ/cm'', and further increased to 7.2 x 10'. mJ/am2 to green and finally 3.5x 10' mJ/c
m", it turned yellow. Therefore, x, y, z in Figure 1
To check the degree of discoloration from changes in brightness due to discoloration, use Zr1
Since it is sufficient to trace the change in degree, only the change in zi degree will be shown below.
次に、第二の比較例として、電気泳動粒子に用いる酸化
チタンを７重量％アルミナ表面処理したものを１０ｇ用
意しく帝国化工■製のＢＲ−７）、他の分散媒、着色染
料及び分散剤は、比較例１と同一のものを各々同重量使
用した配合で分散系を調製した。Next, as a second comparative example, 10 g of titanium oxide used for electrophoretic particles with 7% by weight alumina surface treatment was prepared. A dispersion system was prepared using the same weights of the same components as in Comparative Example 1.
［比較例２の分散系配合］
以下、本発明の実施例を明らかにする目的で電気泳動粒
子として各々２．３．５．７及び１３の重量％でアルミ
ナ表面処理を施した酸化チタン（帝国化Ｌ■製）を用意
した。[Dispersion formulation of Comparative Example 2] Hereinafter, for the purpose of clarifying the examples of the present invention, titanium oxide (Temp. (manufactured by Chemical Company Ltd.) was prepared.
次に、分散系を調合する前にこれらの処理済酸化チタン
を１５０℃の温度で２時間加熱処理してその含有水分の
除去を図った。Next, before preparing a dispersion system, these treated titanium oxides were heat-treated at a temperature of 150° C. for 2 hours to remove the moisture contained therein.
そして、これらの熱処理を加えたアルミナ表面処理済酸
化ブータンｌＯｇを各々用いて比較例１と同様に分散系
を調製した。Then, a dispersion system was prepared in the same manner as in Comparative Example 1 using each of the alumina surface-treated butane oxide lOg subjected to these heat treatments.
［実施例の分散系酢合］
そこで、」−２分散系について初期特性を評価したとこ
ろ、電気泳動粒子のＩＴＯガラス電極に対する付着が著
しく、表示不能であった。[Dispersed Acetylation System of Examples] Therefore, when the initial characteristics of the "-2 dispersion system were evaluated, the adhesion of the electrophoretic particles to the ITO glass electrode was significant and display was impossible.
従って、電気泳動粒子としての酸化チタンに対して単に
所要重量％のアルミナ表面処理を施したのみでは所期の
結果を得ることは出来ない。Therefore, it is not possible to obtain the desired results simply by subjecting titanium oxide as electrophoretic particles to the surface treatment of alumina in the required weight percent.
この実施例の分散系に関する初期特性評価並びに変色試
験を行った結果、上記５種類の重量％でアルミナ表面処
理を施した熱処理済酸化チタンを使用して構成した各電
気泳動表示装置に於いては、比較例２の如き電気泳動粒
子のＩＴＯガラス電極に対する付着現象は発生せず、良
好な表示動作を得ることが出来た。As a result of initial characteristic evaluation and discoloration test for the dispersion system of this example, it was found that each electrophoretic display device constructed using heat-treated titanium oxide subjected to alumina surface treatment with the above five types of weight percentages. The phenomenon of adhesion of electrophoretic particles to the ITO glass electrode as in Comparative Example 2 did not occur, and a good display operation could be obtained.
また、変色試験結果に関しては、第２図のとおり、酸化
チタンに対するアルミナ処理量が７重量％以上であれば
、変色の度合を格段に改善できることが分った。Further, regarding the discoloration test results, as shown in FIG. 2, it was found that if the amount of alumina treated with respect to titanium oxide was 7% by weight or more, the degree of discoloration could be significantly improved.
なお、第２図中、グラフ■〜■は酸化チタンに対するア
ルミナ処理量が重量％で各々０．２．３．５．７及び１
３の上記各分散系に関するＺ輝度の低下特性を示す。In Fig. 2, graphs ■ to ■ indicate that the amount of alumina treated with respect to titanium oxide is 0.2, 3, 5.7 and 1, respectively, in weight%.
3 shows the Z brightness reduction characteristics for each of the above-mentioned dispersion systems.
分散系中の染料変色防止手段として、上記では酸化チタ
ンにアルミナ表面処理を施して熱処理したものを示した
が、酸化チタンの触媒作用を抑制する為にアルミナ表面
処理単独に加えて、シリカ或いはチタニア等を用いて併
せて複数種類の表面処理を施すことも可能である。As a means to prevent dye discoloration in the dispersion system, titanium oxide was heat treated with alumina surface treatment in the above example, but in addition to alumina surface treatment alone, silica or titania may be used to suppress the catalytic action of titanium oxide. It is also possible to perform multiple types of surface treatments at the same time.
「発明の効果」
以上のとおり、本発明の電気泳動表示装置によれば、表
示用分散系を構成する電気泳動粒子としての酸化チタン
はアルミナ表面被覆され且つその含有水分を除去すべく
構成したので、酸化チタンに起因する触媒作用を抑制し
て分散系の着色染料の変色を阻止若しくはその変色の度
合を実用に耐え得る程度に十分に低減でき、従って、自
然光及び人工光を含めて過酷な紫外光での使用環境下で
も長期間に亘って表示性の高い安定した電気泳動表示動
作を達成できる。"Effects of the Invention" As described above, according to the electrophoretic display device of the present invention, the titanium oxide as the electrophoretic particles constituting the display dispersion is coated with alumina and is configured to remove the moisture contained therein. By suppressing the catalytic action caused by titanium oxide, it is possible to prevent or sufficiently reduce the degree of discoloration of the coloring dye in the dispersed system to the extent that it can withstand practical use. Stable electrophoretic display operation with high display performance can be achieved over a long period of time even in a light usage environment.
表示用分散系自体で着色染料の変色防止構造を構成でき
るので、他の付加的な構造を要することなく表示装置の
低コスト化を図りながら表示動作の耐久性を格段に高め
得る。Since the discoloration prevention structure of the colored dye can be formed by the display dispersion system itself, it is possible to significantly improve the durability of the display operation while reducing the cost of the display device without requiring any other additional structure.
酸化チタンを電気泳動粒子として使用する斯かる変色耐
久性の良好な表示用分散系は、酸化チタンに対してアル
ミナ表面処理を施して所要条件で熱処理を加えたものを
他の配合成分と任意調製することにより簡便に製造でき
る。Such a display dispersion system that uses titanium oxide as electrophoretic particles and has good durability against discoloration can be prepared by arbitrarily preparing titanium oxide with alumina surface treatment and heat treatment under the required conditions with other ingredients. It can be easily manufactured by doing this.
第１図は本発明の詳細な説明する為に、電気泳動表示用
分散系中の泳動粒子としての酸化チタンにアルミナ表面
処理を何ら施さない場合に於ける表示用分散系の変色度
合を紫外線照射エネルギーに対するｘ、ｙ、ｚの各輝度
変化特性として示す図、
第２図は本発明に係る電気泳動表示装置で用いたアルミ
ナ表面処理及び熱処理を施した酸化チタンを有する表示
用分散系に於いて、アルミナ処理重量％を０．２．３．
５．７及び１３とした場合の表示用分散系の同様な各２
輝度変化特性図であり、そして、
第３図はこの種の電気泳動表示装置の概念的な断面構成
図である。
ｌ、３： 透明ガラス板
２．４： 電極バタ・−・ン
５： スペーサ兼封止部材
６： 電気泳動粒子
７： 表示用分散系In order to explain the present invention in detail, Figure 1 shows the degree of discoloration of a dispersion system for electrophoretic display when the titanium oxide as the migrating particles in the dispersion system for electrophoretic display is not subjected to any alumina surface treatment when irradiated with ultraviolet rays. Figure 2 shows the x, y, and z luminance change characteristics with respect to energy. , alumina treatment weight % is 0.2.3.
5.7 and 13 for each similar display dispersion system 2
FIG. 3 is a diagram showing brightness change characteristics, and FIG. 3 is a conceptual cross-sectional configuration diagram of this type of electrophoretic display device. 1, 3: Transparent glass plate 2.4: Electrode butter 5: Spacer/sealing member 6: Electrophoretic particles 7: Dispersion system for display
Claims (4)
板間に電気泳動粒子を分散させた分散系を封入し、該電
極板間に印加した表示制御用電圧の作用下に分散系内の
電気泳動粒子の分布状態を変えることによって光学的反
射特性に変化を与えて所要の表示動作を行わせる為の電
気泳動表示装置に於いて、電気泳動粒子としてアルミナ
表面処理し熱処理した酸化チタンと着色染料とを具備す
るように上記分散系を構成したことを特徴とする電気泳
動表示装置。(1) A dispersion system in which electrophoretic particles are dispersed is sealed between a pair of opposing electrode plates, at least one of which is transparent, and a dispersion system in which electrophoretic particles are dispersed is sealed under the action of a display control voltage applied between the electrode plates. In electrophoretic display devices that change the optical reflection characteristics by changing the distribution state of electrophoretic particles to perform the desired display operation, alumina surface treatment and heat-treated titanium oxide and coloring are used as electrophoretic particles. An electrophoretic display device characterized in that the dispersion system is configured to include a dye.
板間に電気泳動粒子を分散させた分散系を封入し、該電
極板間に印加した表示制御用電圧の作用下に分散系内の
電気泳動粒子の分布状態を変えることによって光学的反
射特性に変化を与えて所要の表示動作を行わせる為の電
気泳動表示用分散系に於いて、電気泳動粒子としてアル
ミナ表面処理し熱処理した酸化チタンと着色染料とを含
むことを特徴とする電気泳動表示用分散系。(2) A dispersion system in which electrophoretic particles are dispersed is sealed between a pair of opposing electrode plates, at least one of which is transparent, and the dispersion system in which electrophoretic particles are dispersed is sealed under the action of a display control voltage applied between the electrode plates. Titanium oxide with alumina surface treatment and heat treatment is used as electrophoretic particles in a dispersion system for electrophoretic display that changes the optical reflection characteristics by changing the distribution state of electrophoretic particles and performs the desired display operation. and a colored dye.
板間に電気泳動粒子を分散させた分散系を封入し、該電
極板間に印加した表示制御用電圧の作用下に分散系内の
電気泳動粒子の分布状態を変えることによって光学的反
射特性に変化を与えて所要の表示動作を行わせる為の電
気泳動表示装置に於ける表示用分散系を製造する方法に
於いて、アルミナ表面処理を７重量％以上施した酸化チ
タンと着色染料とを調合する前に、上記アルミナ表面処
理酸化チタンを加熱処理することを特徴とする電気泳動
表示装置に於ける表示用分散系の製造法。(3) A dispersion system in which electrophoretic particles are dispersed is sealed between a pair of electrode plates, at least one of which is transparent, which are arranged opposite to each other, and the dispersion system in which electrophoretic particles are dispersed is sealed under the action of a display control voltage applied between the electrode plates. In a method for manufacturing a display dispersion system in an electrophoretic display device, which changes the optical reflection characteristics by changing the distribution state of electrophoretic particles and performs a desired display operation, alumina surface treatment is used. A method for producing a display dispersion system for an electrophoretic display device, characterized in that the alumina surface-treated titanium oxide is heat-treated before blending the titanium oxide coated with 7% by weight or more of a coloring dye.
が１５０℃で２時間以上である請求項（３）の表示用分
散系の製造法。(4) The method for producing a display dispersion system according to claim (3), wherein the heat treatment conditions for the alumina surface-treated titanium oxide are at 150° C. for 2 hours or more.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4360789A JP2733676B2 (en) | 1989-02-25 | 1989-02-25 | Electrophoretic display device, display dispersion system, and method for producing the dispersion system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4360789A JP2733676B2 (en) | 1989-02-25 | 1989-02-25 | Electrophoretic display device, display dispersion system, and method for producing the dispersion system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH02223932A true JPH02223932A (en) | 1990-09-06 |
| JP2733676B2 JP2733676B2 (en) | 1998-03-30 |
Family
ID=12668520
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4360789A Expired - Lifetime JP2733676B2 (en) | 1989-02-25 | 1989-02-25 | Electrophoretic display device, display dispersion system, and method for producing the dispersion system |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2733676B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5745094A (en) * | 1994-12-28 | 1998-04-28 | International Business Machines Corporation | Electrophoretic display |
| US6144361A (en) * | 1998-09-16 | 2000-11-07 | International Business Machines Corporation | Transmissive electrophoretic display with vertical electrodes |
| US6184856B1 (en) | 1998-09-16 | 2001-02-06 | International Business Machines Corporation | Transmissive electrophoretic display with laterally adjacent color cells |
| US6225971B1 (en) | 1998-09-16 | 2001-05-01 | International Business Machines Corporation | Reflective electrophoretic display with laterally adjacent color cells using an absorbing panel |
| US6271823B1 (en) | 1998-09-16 | 2001-08-07 | International Business Machines Corporation | Reflective electrophoretic display with laterally adjacent color cells using a reflective panel |
| US6392786B1 (en) | 1999-07-01 | 2002-05-21 | E Ink Corporation | Electrophoretic medium provided with spacers |
-
1989
- 1989-02-25 JP JP4360789A patent/JP2733676B2/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5745094A (en) * | 1994-12-28 | 1998-04-28 | International Business Machines Corporation | Electrophoretic display |
| US5872552A (en) * | 1994-12-28 | 1999-02-16 | International Business Machines Corporation | Electrophoretic display |
| US6144361A (en) * | 1998-09-16 | 2000-11-07 | International Business Machines Corporation | Transmissive electrophoretic display with vertical electrodes |
| US6184856B1 (en) | 1998-09-16 | 2001-02-06 | International Business Machines Corporation | Transmissive electrophoretic display with laterally adjacent color cells |
| US6225971B1 (en) | 1998-09-16 | 2001-05-01 | International Business Machines Corporation | Reflective electrophoretic display with laterally adjacent color cells using an absorbing panel |
| US6271823B1 (en) | 1998-09-16 | 2001-08-07 | International Business Machines Corporation | Reflective electrophoretic display with laterally adjacent color cells using a reflective panel |
| US6392786B1 (en) | 1999-07-01 | 2002-05-21 | E Ink Corporation | Electrophoretic medium provided with spacers |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2733676B2 (en) | 1998-03-30 |
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