Patent · US Expired

Display device

US5793451A · kind A · utility

2Cited by

5References

10Claims

0Family size

Assignee

VDO Adolf Schindling AG · DE

Inventors

Peter Brandt · Berghausen, DE
Dietmar Tippl · Kelkheim, DE

Key dates

Filing date	Jan 30, 1997
Grant date	Aug 11, 1998
Priority date	—
Expiry date	Jan 30, 2017

Classification

Technology area (CPC G)Physics
CPC primaryG02F1/13725
WIPO fieldOptics
WIPO sectorInstruments

Abstract

In a display device having a TN liquid crystal cell which can be illuminated by transmitted light from a source of light, the nematic liquid crystal substance of which cell contains a coloring substance. The control regions of the TN liquid crystal cell can be acted on by an actuation voltage between an actuation level and a non-actuation level of the electro-optic characteristic curve, in which connection bright signs can be shown on a dark display surface by the liquid crystal cell. The liquid crystal cell can be acted on by an actuation voltage between the actuation level and a non-actuation level in the undershoot region of the characteristic having the least transmission.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.