Optical devices having reflective and transmissive modes for display
US6894821B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 28, 2002 |
| Grant date | May 17, 2005 |
| Priority date | — |
| Expiry date | Nov 6, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F2203/09
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Display apparatuses are shown capable of displaying information in a reflective mode using only ambient light and in a transmissive mode using a light source. In one embodiment, the display apparatus includes a reflecting polarizer disposed between a light modulating layer and an isotropic light cavity. The light cavity reflects incident light with a first degree of depolarization. The reflecting polarizer reflects light with a second degree of depolarization for at least one polarization that is greater than the first degree of depolarization. In another embodiment of the display apparatus, a microstructured film is included above a light cavity and below a light modulating system where the microstructured film includes sawtooth formations having at least a tilted surface. In another embodiment of a dual-mode display device, the display includes a cholesteric reflecting polarizer disposed between a light modulating layer and a light cavity where the light cavity causes a polarization phase shift upon reflectance.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.