# US 9,129,539 B2 · Device for displaying information

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- Number: US 9,129,539 B2
- Document ID: US9129539B2
- Status: Granted
- Kind: B2
- Application number: 13/115,136
- Filed: 2011-05-25
- Published: 2011-12-01
- Granted: 2015-09-08
- Earliest claimed: 2010-05-25
- Assignees: Advanced Display Technology AG
- Applicants: Andriy Bitman; Oliver Mueller-Marc; Dieter Jerosch
- Inventors: Andriy Bitman; Oliver Mueller-Marc; Dieter Jerosch
- Web page: https://patentgrep.com/patent/US9129539B2

## CPC

- G09F 9/372: {the positions of the elements being controlled by the application of an electric field}
- G02B 26/004: {based on a displacement or a deformation of a fluid}
- Y10T 137/206: Flow affected by fluid contact, energy field or coanda effect [e.g., pure fluid device or system]
- G09F: DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G02B: OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION

## Abstract

A device for displaying information comprising at least one display element which includes: a liquid, the surface energy thereof being variable by means of an electric field; a first and a second volume for receiving the liquid, wherein said first and said second volume are defined by a first effective radius or a second effective radius, respectively, a fluidic passage between said first and said second volume, wherein in a first state said liquid substantially occupies said first volume and wherein in a second state said liquid substantially occupies said second volume, is characterized in that said passage is configured such that the fraction of the liquid facing to the unoccupied volume comprises a radius which is smaller than the effective radius of the presently occupied volume.

## Claims

### Claim 1

A device for displaying information comprising at least one display element which includes:
a liquid, the surface energy thereof being variable by means of an electric field;
a first and a second volume for receiving the liquid, wherein said first and said second volume are defined by a first effective radius or a second effective radius, respectively;
a fluidic passage between said first and said second volume,
wherein in a first state said liquid substantially occupies said first volume and wherein in a second state said liquid substantially occupies said second volume, and
wherein said passage is configured such that the fraction of the liquid facing to the unoccupied volume comprises a radius which is smaller than the effective radius of the presently occupied volume such that if the liquid occupies the first volume it will remain disposed in a stable manner in the first volume if the electric field is turned off and if the liquid occupies the second volume it will remain disposed in a stable manner in the second volume if the electric field is turned off, and
wherein said first and/or said second volume are in fluidic connection with at least one respectively associated return volume, wherein the liquid volume is adjusted such that said return volume is partly filled and a radius forms which is larger than the radius of the liquid within the passage.

### Claim 2 (depends on 1)

The device of claim 1, wherein a constriction is provided between said first and/or said second volume and said passage or within said passage.

### Claim 3 (depends on 1)

The device of claim 1, wherein said passage is configured as a straight duct having maximum length and defined cross section.

### Claim 4

A device for displaying information comprising at least one display element which includes:
a liquid, the surface energy thereof being variable by means of an electric field;
a first and a second volume for receiving the liquid, wherein said first and said second volume are defined by a first effective radius or a second effective radius, respectively;
a single fluidic passage between said first and said second volume,
wherein in a first state said liquid substantially occupies said first volume and wherein in a second state said liquid substantially occupies said second volume, and
wherein said single passage is configured such that the fraction of the liquid facing to the unoccupied volume comprises a radius which is smaller than the effective radius of the presently occupied volume such that if the liquid occupies the first volume it will remain disposed in a stable manner in the first volume if the electric field is turned off and if the liquid occupies the second volume it will remain disposed in a stable manner in the second volume if the electric field is turned off, and
wherein said first and/or said second volume are in fluidic connection with at least one respectively associated return volume, wherein the liquid volume is adjusted such that said return volume is partly filled and a radius forms which is larger than the radius of the liquid within the passage.

### Claim 5 (depends on 4)

The device of claim 4, wherein a constriction is provided between said first and/or said second volume and said passage or within said passage.

### Claim 6 (depends on 4)

The device of claim 4, wherein said passage is configured as a straight duct having maximum length and defined cross section.