Erasable thermo-optic storage display of a transmitted image
US4040047A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 10, 1975 |
| Grant date | Aug 2, 1977 |
| Priority date | — |
| Expiry date | Jun 10, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N5/7441
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The invention provides an optical display device, utilizing a thermo-optical effect to inscribe a transmitted image in a film of a material exhibiting a smectic state. The crystal liquid layer is inserted between transparent electrodes and heated to be in the smectic mesophase. The image is recorded in the layer under the form of variations in the scattering coefficient thereof by applying the video signal transmitting the image between the electrodes, while an infra-red beam of constant intensity synchronously scans the layer at a constant rate to successively raise each point beyond the melting point of the liquid crystal material. A quick erasure of the recorded image is provided by applying between the electrodes a voltage pulse of suitable value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.