Bi-stable electrowetting optical element and driving method therefor
US7548363B2 · kind B2 · utility
18Cited by
3References
9Claims
0Family size
Assignee
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Key dates
| Filing date | Jun 14, 2005 |
| Grant date | Jun 16, 2009 |
| Priority date | — |
| Expiry date | Nov 20, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09F9/372
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An optical element used, e.g., in an electrowetting display device having a number of pixels, is arranged in an array. Each optical element includes a cell filled with a polar conductive fluid, such as a water solution, and a non-polar fluid, such as an oil. The cell further includes first and second planar electrodes covered with first and second hydrophobic layers. By applying a voltage between the first fluid and alternately the first or second electrodes, the oil is forced to migrate between the first and second hydrophobic layers. Thus a bi-stable, energy efficient optical element is provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.