Holographic reflective color liquid crystal display device
US5812229A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 1, 1996 |
| Grant date | Sep 22, 1998 |
| Priority date | — |
| Expiry date | May 1, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02F1/133567
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A liquid crystal display device (10) includes a front polarizer (12), a liquid crystal cell (14), a retardation film (16), a back polarizer (18), and a reflective holographic optical element (20). Diffuse ambient light illuminates the front polarizer (12), which polarizes the ambient light and transmits the polarized light to the liquid crystal cell (14). The liquid crystal cell (14) receives the polarized light and transmits polarized light derived from the incident polarized light to the retardation film (16). The retardation film (16) receives the polarized light and transmits polarized light, including light within a selected spectral band. The back polarizer (18) receives the polarized light from the retardation film (16) and selectively transmits polarized light derived from the incident polarized light. The reflective holographic optical element (20) receives polarized light from the back polarizer (18) and redirects the polarized light toward the back polarizer (18), wherein the light has an effective spectral band that includes light in the selected spectral band.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.