Optical element, and illuminating optical device, display device and electronic device using the same
US8026880B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 29, 2007 |
| Grant date | Sep 27, 2011 |
| Priority date | — |
| Expiry date | Jun 6, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133607
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A microlouver includes a periodic structure in which a transparent layer and a light absorption layer are alternately disposed with a constant, repetitive period. The range of the exit direction of a light beam passing through the transparent layer is restricted by the light absorption layer. The periodic structure includes a periodic structure portion divided in the direction that intersects the direction in which the transparent layer and the light absorption layer are repeatedly disposed. In the periodic structure portion, between the periodic structures adjacent to each other, there is a difference of 180 degree in the phase of spatial frequency of each periodic structure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.