Global Patent Index - EP 0995184 A1

EP 0995184 A1 2000-04-26 - FERROELECTRIC LIQUID-CRYSTAL DISPLAY WITH WIDE RANGE OF WORKING TEMPERATURES

Title (en)

FERROELECTRIC LIQUID-CRYSTAL DISPLAY WITH WIDE RANGE OF WORKING TEMPERATURES

Title (de)

FERROELEKTRISCHES FLÜSSIGKRISTALLDISPLAY MIT BREITEM ARBEITSTEMPERATURBEREICH

Title (fr)

AFFICHAGE A CRISTAUX LIQUIDES FERROELECTRIQUES A LARGE SPECTRE DE TEMPERATURE DE TRAVAIL

Publication

EP 0995184 A1 (DE)

Application

EP 98941322 A

Priority

  • DE 19731020 A
  • EP 9804335 W

Abstract (en)

[origin: DE19731020A1] The invention relates to a ferroelectric liquid-crystal display containing a ferroelectric liquid-crystal mixture, characterized in that the display is controlled with voltage pulses >/=0.9 ms. The display provided for by the invention is especially suited for applications in which the length of switching time is not critical. Such displays can be switched with the same voltage in a very wide range of temperatures, thus making it unnecessary for the voltage to be adjusted in line with the temperature. Potential applications include displays in chip cards, electronic pricing or display signs (shelf labels), PDAs (personal digital assistants) and pagers.

IPC 1-7 (main, further and additional classification)

G09G 3/36; G02F 1/141

IPC 8 full level (invention and additional information)

C09K 19/42 (2006.01); C09K 19/58 (2006.01); G02F 1/133 (2006.01); G02F 1/137 (2006.01); G02F 1/141 (2006.01); G09G 3/36 (2006.01)

CPC (invention and additional information)

C09K 19/3003 (2013.01); C09K 19/42 (2013.01); C09K 19/588 (2013.01); G02F 1/141 (2013.01); G09G 3/3629 (2013.01); G09G 2310/06 (2013.01)

Citation (search report)

See references of WO 9904383A1

Designated contracting state (EPC)

DE FR GB

EPO simple patent family

DE 19731020 A1 19990121; EP 0995184 A1 20000426; JP 2001510910 A 20010807; US 6549188 B1 20030415; WO 9904383 A1 19990128

INPADOC legal status


2003-04-23 [18W] WITHDRAWN

- Effective date: 20030224

2000-04-26 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20000217

2000-04-26 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): DE FR GB