JPH05173194A - Electrophoretic display device - Google Patents
Electrophoretic display deviceInfo
- Publication number
- JPH05173194A JPH05173194A JP3355954A JP35595491A JPH05173194A JP H05173194 A JPH05173194 A JP H05173194A JP 3355954 A JP3355954 A JP 3355954A JP 35595491 A JP35595491 A JP 35595491A JP H05173194 A JPH05173194 A JP H05173194A
- Authority
- JP
- Japan
- Prior art keywords
- display
- display device
- electrophoretic
- driving voltage
- transparent
- 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.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、電気泳動粒子を利用し
た表示装置に於いて、表示動作を行わせる為の表示駆動
用電圧の印加時間を制限することにより、分散系の変質
を抑えて表示寿命を高めるようにした電気泳動表示装置
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention, in a display device using electrophoretic particles, suppresses alteration of a dispersion system by limiting the application time of a display driving voltage for performing a display operation. The present invention relates to an electrophoretic display device having a long display life.
【０００２】[0002]
【従来の技術】電気泳動粒子を利用したこの種の電気泳
動表示装置は、図４の如く、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用いて所要の表示用
電極パタ−ン２、５を各別に形成した二枚の透明ガラス
板１、４を設け、液体分散媒に電気泳動粒子を分散させ
た分散系３をその対向間隙間に封入する為にスペ−サの
機能をも兼ねる封止部材６を外周部位に配装した構造を
有する。2. Description of the Related Art An electrophoretic display device of this kind using electrophoretic particles has a required display electrode pattern using an appropriate transparent conductive member such as indium tin oxide on the opposite surface as shown in FIG. Two transparent glass plates 1 and 4 each of which is formed with a pair of transparent glass plates 2 and 5 are provided, and the space between the opposing gaps is filled with a dispersion system 3 in which electrophoretic particles are dispersed in a liquid dispersion medium. It also has a structure in which a sealing member 6 which also serves as the above is provided on the outer peripheral portion.
【０００３】このような構造の電気泳動表示装置は、電
極パタ−ン２、５に表示駆動用電圧を印加して電気泳動
粒子を電極パタ−ン２、５に吸着・離反させ得るように
分散系３に電界を作用させて電気泳動粒子の分布状態を
変えることにより分散系３の光学的特性に変化を与えて
文字、記号又は図形等の所望の表示動作を行わせるもの
である。In the electrophoretic display device having such a structure, a display driving voltage is applied to the electrode patterns 2 and 5 to disperse the electrophoretic particles so that the electrophoretic particles can be adsorbed and separated from the electrode patterns 2 and 5. By applying an electric field to the system 3 to change the distribution state of the electrophoretic particles, the optical characteristics of the dispersion system 3 are changed so that a desired display operation of characters, symbols or figures can be performed.
【０００４】[0004]
【発明が解決しようとする課題】このような電気泳動表
示装置に於いて、表示駆動用電圧の印加時間が電気泳動
粒子の電極への吸着・離反の時間に比べて短い場合には
必要なコントラストが得られないので、表示駆動用電圧
の印加時間を一定以上長くする必要がある。In such an electrophoretic display device, when the application time of the display drive voltage is shorter than the adsorption / separation time of the electrophoretic particles to the electrodes, the necessary contrast is obtained. Therefore, it is necessary to lengthen the application time of the display driving voltage by a certain amount or more.
【０００５】しかし、表示駆動用電圧を長時間印加する
と、分散系の変質による変色や付着等の表示劣化を起こ
すことも知られている。これは長時間の電圧印加による
電子の流入・流出により電気泳動粒子の移動だけでな
く、分散系の酸化・還元を誘起するので、例えば、染料
の変質や粒子分散の為の界面活性剤の変質、電極成分の
分散系への溶解或いはこれらの組合せ等が表示劣化の原
因となっている。However, it is also known that when a display driving voltage is applied for a long time, display deterioration such as discoloration or adhesion due to alteration of the dispersion system occurs. This induces oxidation / reduction of the dispersion system as well as migration of electrophoretic particles due to the inflow / outflow of electrons due to long-term voltage application, and therefore, for example, alteration of the dye or alteration of the surfactant for particle dispersion. Dissolution of the electrode components in the dispersion system or a combination thereof causes display deterioration.
【０００６】[0006]
【課題を解決するための手段】本発明はそこで、表示駆
動用電圧の印加時間を所要のコントラストが得られる最
短の時間に制限することにより、分散系の変質を抑制し
て所望の表示状態を長い期間維持可能な長寿命の電気泳
動表示装置を提供するものである。In the present invention, therefore, the application time of the display driving voltage is limited to the shortest time to obtain the required contrast, so that the deterioration of the dispersion system is suppressed and the desired display state is obtained. The present invention provides a long-life electrophoretic display device that can be maintained for a long period of time.
【０００７】この種の電気泳動表示装置に於いて、表示
動作を行わせる為に表示駆動用電圧を印加すると、ク−
ロン力により電気泳動粒子の移動が起こるが、同時に分
散系内に一様に熱拡散している染料や界面活性剤の移動
も起こるので、電極表面に到達した染料や界面活性剤は
電極から流入・流出する電子によって変質を起こす。こ
のような事態を抑制する為には、染料や界面活性剤が電
極表面に移動後の印加されている時間を短くすればよ
い。In this type of electrophoretic display device, when a display driving voltage is applied in order to perform a display operation, a blackout occurs.
The migration of electrophoretic particles occurs due to the ron force, but at the same time, the migration of dyes and surfactants that are uniformly thermally diffused in the dispersion system also occurs, so dyes and surfactants that reach the electrode surface flow from the electrodes.・ Changes in quality due to electrons flowing out. In order to suppress such a situation, it is sufficient to shorten the time during which the dye or the surfactant is applied after being transferred to the electrode surface.
【０００８】従って、本発明の電気泳動表示装置では、
少なくとも一方が透明な一組の対向電極板間に電気泳動
粒子を含む分散系を封入し、上記電極板間に印加した表
示駆動用電圧の作用下に上記電気泳動粒子を透明な上記
電極板側に吸着・離反させることにより所要の表示動作
を行わせる電気泳動表示装置に於いて、上記表示駆動用
電圧の印加時間を所要のコントラストが得られる最短の
時間に制限するように構成したものである。Therefore, in the electrophoretic display device of the present invention,
A dispersion system containing electrophoretic particles is enclosed between a pair of opposing electrode plates, at least one of which is transparent, and the electrophoretic particles are transparent under the action of a display driving voltage applied between the electrode plates. In an electrophoretic display device in which a desired display operation is performed by adsorbing and separating to and from the device, the application time of the display drive voltage is configured to be limited to the shortest time that a required contrast can be obtained. .
【０００９】[0009]
【実施例】以下、図示の実施例を参照しながら本発明を
更に詳述する。図１は本発明による電気泳動表示装置の
概念的な拡大断面構成図を示し、１０は透明電極板を構
成する為の基材としての透明なガラス板であってその上
面には酸化インジウム・スズ等の透明導電材料を使用し
て所要の電極パタ−ン１１を適宜形成してある。この透
明電極板の上面には分散系１５を小区間に分割して封入
する為の多孔性スペ−サ１４を配装してある。この多孔
性スペ−サ１４は、シリコンゴム、ウレタンゴム、フッ
素ゴム、アクリルゴム等の合成ゴムや天然ゴム等の素材
からなるシ−ト状物にパンチ、レ−ザ等の手段で所要の
透孔を多数穿設したものを透明電極板の電極パタ−ン１
１形成側に一体的に設けるか、若しくは感光性樹脂をそ
の電極パタ−ン１１の上に被着形成してエッチング等の
化学的溶解手段で所要の透孔を任意に形成できる。The present invention will be described in more detail below with reference to the illustrated embodiments. FIG. 1 is a conceptual enlarged cross-sectional configuration diagram of an electrophoretic display device according to the present invention. Reference numeral 10 is a transparent glass plate as a base material for forming a transparent electrode plate, on the upper surface of which indium tin oxide is used. The required electrode pattern 11 is appropriately formed using a transparent conductive material such as. A porous spacer 14 is provided on the upper surface of the transparent electrode plate for dividing the dispersion system 15 into small sections and enclosing them. The porous spacer 14 is a sheet-like material made of synthetic rubber such as silicone rubber, urethane rubber, fluororubber, acrylic rubber or the like, or natural rubber or the like, and is punched by a means such as a laser. Electrode pattern of transparent electrode plate with many holes 1
1 may be integrally provided on the forming side, or a photosensitive resin may be adhered and formed on the electrode pattern 11 and desired through holes may be arbitrarily formed by a chemical dissolution means such as etching.
【００１０】そして、電極パタ−ン１１と対向する面に
他方の電極パタ−ン１３を形成したガラス板１２からな
る他の電極板は上記多孔性スペ−サ１４の上面に配装さ
れ、且つ、上記各構成部材間を適当な接着剤を用いて相
互に接合することによって、両電極板間に分散系１５を
封入させることができる。Another electrode plate consisting of a glass plate 12 having the other electrode pattern 13 formed on the surface facing the electrode pattern 11 is provided on the upper surface of the porous spacer 14 and The dispersion system 15 can be sealed between both electrode plates by joining the above-mentioned constituent members to each other with an appropriate adhesive.
【００１１】多孔性スペ−サ１４は分散系１５を小区間
に分割して封入させる為のものであるが、図の如き多孔
性スペ−サ１４に限らず、端部封止材を用いて分散系１
５を一様に連続相状に両電極板間に封入することも可能
である。The porous spacer 14 is for dividing the dispersion system 15 into small sections and enclosing the dispersion system 15. However, the porous spacer 14 is not limited to the porous spacer 14 as shown in FIG. Dispersion system 1
It is also possible to uniformly enclose 5 in a continuous phase between both electrode plates.
【００１２】ここで、電極パタ−ン１１、１３間に印加
する表示駆動用電圧の印加時間は、仕様上必要なコント
ラストが得られる最短の時間に制限するように設定する
ものである。Here, the application time of the display drive voltage applied between the electrode patterns 11 and 13 is set so as to be limited to the shortest time at which the contrast required by the specifications is obtained.
【００１３】上記に於いて、表示用分散系１５には、電
気泳動粒子として硫化亜鉛１０ｇ、分散媒としてヘキシ
ルベンゼン３４ｇ、着色染料として油溶性青染料０．４
ｇ、分散剤としてソルビタンセスキオレ−ト１．５ｇを
混合し、１２時間ボ−ルミルで十分に分散させて作製し
たものを使用した。In the above, in the display dispersion system 15, 10 g of zinc sulfide as electrophoretic particles, 34 g of hexylbenzene as a dispersion medium, and 0.4 of an oil-soluble blue dye as a coloring dye are used.
g, and 1.5 g of sorbitan sesquioleate as a dispersant were mixed and sufficiently dispersed with a ball mill for 12 hours to be used.
【００１４】ところで、電極パタ−ン１１、１３間に印
加する表示駆動用電圧は、休止時間を介して例えば＋５
０Ｖと−５０Ｖを交互に印加する方式を採用した。図２
は、その表示駆動用電圧印加パタ−ンを示し、ｔ0（休
止時間）＝ｔ1（印加時間）で試験したものである。By the way, the display drive voltage applied between the electrode patterns 11 and 13 is, for example, +5 through the rest time.
A method of alternately applying 0 V and -50 V was adopted. Figure 2
Indicates the display driving voltage application pattern, which was tested at t 0 (rest time) = t 1 (application time).
【００１５】上記のようなスイッチング電圧印加試験を
行って印加時間と変色を検討したところ、図３の如き変
色試験結果を得た。図３に於いて、横軸は印加時間
（秒）を示し、また、縦軸は変色時間、即ち、試験開始
時との色差（ΔＥ*ａｂ）が３０となった時間を示す。
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Ｌ*ａ*ｂ*
を使用した。When the switching voltage application test was conducted to examine the application time and the color change, the color change test result as shown in FIG. 3 was obtained. In FIG. 3, the horizontal axis represents the application time (seconds), and the vertical axis represents the discoloration time, that is, the time when the color difference (ΔE * ab) from the start of the test was 30.
The expression of discoloration is in an off display state, that is, L * a * b * when the electrophoretic particles are brought closer to the electrode opposite to the display side electrode
It was used.
【００１６】この試験より印加時間の３００ｍｓｅｃと
１ｓｅｃを比較すると、約２．８倍の延命効果がある。
即ち、印加時間の短い方が分散系の変質は発生しにく
い。From this test, comparing the application time of 300 msec and 1 sec, there is a life extension effect of about 2.8 times.
That is, the shorter the application time is, the less the deterioration of the dispersion system occurs.
【００１７】[0017]
【発明の効果】本発明による電気泳動表示装置は、表示
駆動用電圧の印加時間を所要のコントラストが得られる
最短の時間に制限するように構成したので、不必要な表
示駆動用電圧の印加を抑制することにより、分散系の変
質を抑制して所望の表示状態を長い期間維持できる長寿
命の信頼性の高い表示装置を提供することができる。Since the electrophoretic display device according to the present invention is configured so that the application time of the display drive voltage is limited to the shortest time at which the required contrast is obtained, unnecessary application of the display drive voltage is prevented. By suppressing the deterioration, it is possible to provide a highly reliable display device having a long life and suppressing deterioration of the dispersion system and maintaining a desired display state for a long period of time.
【図１】 本発明の一実施例により構成される電気泳動
表示装置の概念的な要部拡大断面構成図。FIG. 1 is an enlarged cross-sectional configuration diagram of a conceptual main part of an electrophoretic display device configured according to an embodiment of the present invention.
【図２】 本発明による表示駆動用電圧印加パタ−ンの
説明図。FIG. 2 is an explanatory diagram of a display driving voltage application pattern according to the present invention.
【図３】 分散系の変色試験結果を示すグラフ。FIG. 3 is a graph showing the results of a discoloration test of a dispersion system.
【図４】 従来の電気泳動表示装置の概念的な要部拡大
断面構成図。FIG. 4 is an enlarged cross-sectional configuration diagram of a conceptual main part of a conventional electrophoretic display device.
１０ 透明ガラス板 １１ 電極パタ−ン １２ 透明ガラス板 １３ 電極パタ−ン １４ 多孔性スペ−サ １５ 分散系 10 Transparent Glass Plate 11 Electrode Pattern 12 Transparent Glass Plate 13 Electrode Pattern 14 Porous Spacer 15 Dispersion System
─────────────────────────────────────────────────────
─────────────────────────────────────────────────── ───
【手続補正書】[Procedure amendment]
【提出日】平成４年１０月１２日[Submission date] October 12, 1992
【手続補正１】[Procedure Amendment 1]
【補正対象書類名】明細書[Document name to be amended] Statement
【補正対象項目名】００１４[Correction target item name] 0014
【補正方法】変更[Correction method] Change
【補正内容】[Correction content]
【００１４】ところで、電極パターン１１、１３間に印
加する表示駆動用電圧は、休止時間を介して例えば＋５
０Ｖと−５０Ｖを交互に印加する方式を採用した。図２
は、その表示駆動用電圧印加パターンを示し、ｔ０（印
加時間）＝ｔ１（休止時間）で試験したものである。By the way, the display drive voltage applied between the electrode patterns 11 and 13 is, for example, +5 through the rest time.
A method of alternately applying 0 V and -50 V was adopted. Figure 2
Indicates the display drive voltage application pattern, and t 0 ( mark
Addition time) = t 1 ( rest time).
───────────────────────────────────────────────────── フロントページの続き (72)発明者 多田隈 昭 茨城県稲敷郡茎崎町天宝喜757 日本メク トロン株式 会社南茨城工場内 (72)発明者 管 眞一郎 茨城県稲敷郡茎崎町天宝喜757 日本メク トロン株式 会社南茨城工場内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Akira Tadakuma 757 Tenhoki, Kashizaki-cho, Inashiki-gun, Ibaraki 757 Inside Mektron Japan Minami-Ibaraki Plant (72) Inventor Shinichiro Kaneizaki, Kizaki-cho, Inashiki-gun, Ibaraki 757 Japan Mektron Co., Ltd. Minami Ibaraki Factory
Claims (1)
板間に電気泳動粒子を含む分散系を封入し、上記電極板
間に印加した表示駆動用電圧の作用下に上記電気泳動粒
子を透明な上記電極板側に吸着・離反させることにより
所要の表示動作を行わせる電気泳動表示装置に於いて、
上記表示駆動用電圧の印加時間を所要のコントラストが
得られる最短の時間に制限するように構成したことを特
徴とする電気泳動表示装置。1. A dispersion system containing electrophoretic particles is enclosed between a pair of transparent electrode plates, at least one of which is transparent, and the electrophoretic particles are transparent under the action of a display driving voltage applied between the electrode plates. In the electrophoretic display device that performs the required display operation by adsorbing and separating from the electrode plate side,
An electrophoretic display device, characterized in that the application time of the display driving voltage is limited to the shortest time at which a required contrast is obtained.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3355954A JPH05173194A (en) | 1991-12-20 | 1991-12-20 | Electrophoretic display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3355954A JPH05173194A (en) | 1991-12-20 | 1991-12-20 | Electrophoretic display device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05173194A true JPH05173194A (en) | 1993-07-13 |
Family
ID=18446584
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3355954A Pending JPH05173194A (en) | 1991-12-20 | 1991-12-20 | Electrophoretic display device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05173194A (en) |
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| US6762744B2 (en) | 2000-06-22 | 2004-07-13 | Seiko Epson Corporation | Method and circuit for driving electrophoretic display, electrophoretic display and electronic device using same |
| US6858164B2 (en) | 2001-01-26 | 2005-02-22 | Ricoh Company Limited | Silicone-oil soluble polymer, image display medium using the silicone-oil soluble polymer and image display device using the image display medium |
| JP2007231208A (en) * | 2006-03-03 | 2007-09-13 | Ricoh Co Ltd | Fine particles, method for producing the same, fine particle dispersion liquid and image display medium and device using the same |
| WO2008143153A1 (en) | 2007-05-18 | 2008-11-27 | Ricoh Company, Ltd. | Electrophoretic particle, electrophoretic particle dispersion liquid, image display medium, and image display device |
| EP2141535A1 (en) | 2008-07-03 | 2010-01-06 | Ricoh Company, Ltd. | Electrophoretic dispersion solution, image display medium using the same, and image display device using the same. |
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| US8728620B2 (en) | 2004-08-31 | 2014-05-20 | Ricoh Company, Ltd. | Fine particles and method of producing thereof, fine particle dispersion liquid, and image display medium and image display apparatus |
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-
1991
- 1991-12-20 JP JP3355954A patent/JPH05173194A/en active Pending
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