← Back to Patent Explorer
EP0149398A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Display device with a memory using a ferroelectric material

Assignee: Thales SA
•
Filing: 1984-12-27
•
Granted: —
•
Expires: 2004-12-27
📄 Original PDF 🌐 Google Patents 🔄 Sync Now

Abstract

Abstract Translated from French L'invention se rapporte aux dispositifs de visualisation à mémoire utilisant un cristal liquide smectique C ou H chiraux. The invention relates to memory display devices using a chiral smectic C or H liquid crystal. L'invention a pour objet un dispositif comprenant une cellule à cristal liquide où des textures (+ θ et - θ) décelables optiquement sont induites par des champs électriques continus de signes appropriés, ces textures étant maintenues sous l'effet de champs électriques alternatifs. The invention relates to a device comprising a liquid crystal cell where textures (+ θ and - θ) optically detectable are induced by continuous electric fields of appropriate signs, these textures being maintained under the effect of alternating electric fields. L'invention s'applique notamment à des dispositifs de visualisation à accès matriciel. The invention applies in particular to display devices with matrix access.

Inventors

  • 👤 Bruno Mourey
  • 👤 Michel Hareng
  • 👤 Jean-Pierre Le Pesant
  • 👤 Jean-Noel Perbet

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-10-28 18:12
CPC Classifications
G; G09; G09G; G09G3/00; G09G3/20; G09G3/34; G09G3/36; G09G3/3611; G09G3/3622; G09G3/3629; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/13725; G02F1/139; G02F1/141

Claims Analysis

Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.

References Cited (Backward Citations)

No citation records indexed.

USPTO Annuity & Maintenance Windows

Maintenance schedule is calculated for granted US utility patents.

Assigned Categories & Tags

No categories assigned to this patent yet.

Assign Category Tag