# US 2014/0153079 A1 · Electrowetting Device

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- Number: US 2014/0153079 A1
- Document ID: US20140153079A1
- Status: Published application
- Kind: A1
- Application number: 14/091,330
- Filed: 2013-11-26
- Published: 2014-06-05
- Earliest claimed: 2012-11-30
- Assignees: National Chung Hsing University
- Applicants: National Chung-Hsing University
- Inventors: Incha HSIEH
- Web page: https://patentgrep.com/patent/US20140153079A1

## CPC

- G02B 26/005: {based on electrowetting}
- G02B 26/004: {based on a displacement or a deformation of a fluid}
- G09G 3/34: by control of light from an independent source
- G09G 3/344: {based on particles moving in a fluid or in a gas, e.g. electrophoretic devices (electrophoretic devices per se G02F1/167)}
- G09G 3/3453: {based on rotating particles or microelements}
- G09G 3/348: {based on the deformation of a fluid drop, e.g. electrowetting}
- B41J 2/14: Structure thereof {only for on-demand ink jet heads}
- B43K 5/10: with reserve ink chambers
- G02B 26/02: for controlling the intensity of light {(G02B26/004 takes precedence)}
- G02B 26/026: {based on the rotation of particles under the influence of an external field, e.g. gyricons, twisting ball displays (based on orientable dipolar particles G02F1/172; based on electrophoresis G02F1/167)}
- G02F 1/09: based on magneto-optical elements, e.g. exhibiting Faraday effect
- G02F 1/094: {based on magnetophoretic effect}
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00)
- B41J: TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B43K: IMPLEMENTS FOR WRITING OR DRAWING (containers, casings or accessories for cosmetic substances, e.g. shaving soap, lipstick, make-up A45D34/00, A45D40/00)
- G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS

## Abstract

An electrowetting device includes: a liquid-confining member including a base and an electrode unit supported on the base, the liquid-confining member defining an inner chamber; a first liquid of a magnetic ink disposed in the inner chamber; and a second liquid of a polar material disposed in the inner chamber and immiscible with the first liquid. The first and second liquids contact each other to define a liquid-liquid interface therebetween.

## Claims

### Claim 1

An electrowetting device comprising:
a liquid-confining member including a base and an electrode unit supported on said base, said liquid-confining member defining an inner chamber;
a first liquid of a magnetic ink disposed in said inner chamber; and
a second liquid of a polar material disposed in said inner chamber and immiscible with said first liquid, said first and second liquids contacting each other to define a liquid-liquid interface therebetween;
wherein said electrode unit is adapted to be connected to an external power source for providing an electric field across said liquid-liquid interface; and
wherein said liquid-liquid interface has a shape that varies in response to a change in the electric field across said liquid-liquid interface.

### Claim 2 (depends on 1)

The electrowetting device of claim 1, wherein said first liquid includes magnetic pigment particles and a nonpolar solvent.

### Claim 3 (depends on 2)

The electrowetting device of claim 2, wherein said magnetic pigment particles have an average particle size of not greater than 50 nm.

### Claim 4 (depends on 2)

The electrowetting device of claim 2, wherein said magnetic pigment particles are made from hydrophobic group modified ferric oxide.

### Claim 5 (depends on 1)

The electrowetting device of claim 1, wherein said liquid-confining member further includes a cover covering said base, said base including a lower substrate that is opposite to said cover in a vertical direction, a surrounding barricade which extends from said lower substrate in the vertical direction and which cooperates with said lower substrate to define an inner space therebetween, and a hydrophobic layer formed in said inner space, said electrode unit including a lower electrode provided on said lower substrate, and an upper electrode provided on said cover.

### Claim 6 (depends on 5)

The electrowetting device of claim 5, wherein said base further includes a hydrophilic wall which extends between said surrounding barricade and said cover and which cooperates with said cover, said hydrophobic layer and said surrounding barricade to define said inner chamber.