Blue filter for display
US12399309B2 · kind B2 · utility
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14Claims
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Key dates
| Filing date | Feb 19, 2021 |
| Grant date | Aug 26, 2025 |
| Priority date | — |
| Expiry date | Feb 15, 2042 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/206
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A display that includes an image producing system and a light filtering layer in the blue range, the light filtering layer having a limited impact on the gamut of the display. The image producing system has a gamut G0 defined in a color space The light filtering layer includes semi-conductive nanoparticles, and the absorbance through the light filtering layer is greater than 0.25 for each light wavelength ranging from 350 nm to λcut, λcut being in the range from 420 nm to 450 nm. The gamut G1 of the image producing system with the filtering layer has an area greater than 90% of the area of gamut G0 in the color space.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.