Display optical film and backlight unit
US11829024B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 18, 2020 |
| Grant date | Nov 28, 2023 |
| Priority date | — |
| Expiry date | Jun 3, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133606
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical stack for reflecting and transmitting light in a predetermined wavelength range includes stacked first and second optical films, the predetermined wavelength range defining a first wavelength range and a remaining wavelength range. For normally incident light and for each wavelength in a first wavelength range, the first optical film substantially reflects light having a first polarization state, and substantially transmits light having a second polarization state. For each of the first and second polarization states, for wavelengths in the first wavelength range, the second optical film has a maximum optical transmittance Tmax for light incident at a first incident angle, and an optical transmittance Tmax/2 for light incident at a second incident angle, where the second incident angle is greater than the first incident angle by less than about 50 degrees. For wavelengths in the remaining wavelength range, the second optical film reflects at least 80% of light.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.