Method and apparatus using a combination of quantum dot-containing films with optical filter films for signage and illumination applications
US10699606B2 · kind B2 · utility
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16Claims
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Key dates
| Filing date | May 11, 2017 |
| Grant date | Jun 30, 2020 |
| Priority date | — |
| Expiry date | Aug 24, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09F2013/222
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
An illuminated sign comprises a source of blue light; a quantum dot-containing film that produces green light when illuminated by the source of blue light; and, a patterned blue cutoff filter in optical communication with the quantum dot-containing film configured to allow a mixture of excess blue light from the source of blue light and green light from the quantum dot-containing film to pass through the pattern. The mixture of blue light and green light produces a pseudo white light. The illuminated sign may thus comprise pseudo white letters and/or graphics on a luminous green background.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.