Spatial light modulator fourier transform
US7317527B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 29, 2004 |
| Grant date | Jan 8, 2008 |
| Priority date | — |
| Expiry date | Aug 31, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/46
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A filter to selectively block light from passing through the filter and to selectively permit light to pass through the filter. The filter includes an array with a plurality of individually addressable filter elements. Each filter element is selectively settable to have a variable transmittance to the light of between substantially zero percent and substantially one hundred percent. In this manner, the filter according to the present invention provides areas that pass only a portion of the light, and thus can block the light using patterns other than just an abrupt on/off filtering. By so doing, the filter is able to dramatically reduce, and in some embodiments eliminate, the light ringing that typically accompanies such on/off filters.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.