Ferroelectric liquid crystal light doubler with temperature and voltage controlled tilt angle
US6198523A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Oct 28, 1999 |
| Grant date | Mar 6, 2001 |
| Priority date | — |
| Expiry date | Oct 28, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09G2320/066
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A ferroelectric liquid crystal-based switchable half-wave plate with improved alignment control, a ferroelectric liquid crystal-based light valve system with improved contrast control, and a method of improving contrast in a ferroelectric liquid crystal-based light valve system. The switchable half-wave plate with improved alignment control includes a layer of ferroelectric liquid crystal material sandwiched between a first transparent electrode and a second transparent electrode. The switchable half-wave plate also includes an electric field direction switching circuit configured to switch the electric field across the liquid crystal material between the forward direction and the reverse direction in response to a control signal. The switchable half-wave plate additionally includes an electric field magnitude control circuit to adjust the tilt angle in response to a signal received at a alignment control signal input. The ferroelectric liquid crystal-based light valve system according to the invention includes at least one ferroelectric liquid crystal-based spatial light modulator, an analyzer having a direction of minimum transmissivity, a ferroelectric liquid crystal-based switc…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.