Resonance enhanced absorptive color filters having resonance cavities
US9231013B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 5, 2012 |
| Grant date | Jan 5, 2016 |
| Priority date | — |
| Expiry date | Jan 24, 2034 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10F39/8063
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Resonance enhanced color filter arrays are provided for image sensors. Resonance cavities formed with color filter materials that enhance the color filtering capabilities of the color filter materials. Resonance enhanced color filter arrays may be provided for back side illumination image sensors and front side illumination image sensors. A layer of high refractive index material or metamaterial may be provided between a microlens and a color filter material to serve as a first partially reflecting interface for the resonance cavity. An optional layer of high refractive index material or metamaterial may be provided between color filter material and a substrate. In front side illumination image sensors, color filter material may be provided in a light guide structure that extends through interlayer dielectric. The color filter material in the light guide structure may form at least part of a resonance cavity for a resonance enhanced color filter array.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.