Global Patent Index - EP 1084444 A1

EP 1084444 A1 2001-03-21 - ILLUMINATION OF A LIQUID CRYSTAL DISPLAY

Title (en)

ILLUMINATION OF A LIQUID CRYSTAL DISPLAY

Title (de)

BELEUCHTUNG EINER FLÜSSIGKRISTALLANZEIGE

Title (fr)

ECLAIREMENT D'UN AFFICHAGE A CRISTAUX LIQUIDES

Publication

EP 1084444 A1 (EN)

Application

EP 99928422 A

Priority

  • US 9912652 W
  • US 9076898 A

Abstract (en)

[origin: WO9963399A1] A high contrast, rapid response liquid crystal imaging system is provided. The imaging element (901) uses a liquid crystal composite (e.g. made of encapsulated liquid crystal) that is less than 4 micrometers thick, and preferably less than 2.5 micrometers thick. The imaging element is illuminated by at least one light source (903) that is positioned at an angle of less than 30 degrees off of the display normal. The viewing system (1307) is positioned on the same side of the display as the light source and is located approximately normal to the display. In one aspect, the liquid crystal composite is operated in a reverse mode and a virtual image is created. In another aspect, at least three light sources of different colors illuminate a liquid crystal imaging element. The sources are all located within an angle of approximately 30 degrees from the imaging element normal. A processor (1311) is coupled to both the light sources (903) and the imaging element (901), thereby allowing the individual color light sources to be synchronized with the output of the imaging element.

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

G02F 1/1335; G02F 1/1333; H04N 9/31

IPC 8 full level (invention and additional information)

G02F 1/1334 (2006.01); G02F 1/13357 (2006.01); G09F 9/00 (2006.01); H04N 9/30 (2006.01); H04N 9/31 (2006.01); G02F 1/1335 (2006.01)

CPC (invention and additional information)

G02F 1/133553 (2013.01); G02F 1/1334 (2013.01); H04N 9/3111 (2013.01); H04N 9/3155 (2013.01); G02F 1/133611 (2013.01); G02F 2001/133616 (2013.01); G02F 2001/133622 (2013.01); G09G 3/3611 (2013.01); G09G 2310/0235 (2013.01); G09G 2310/08 (2013.01)

Citation (search report)

See references of WO 9963399A1

Designated contracting state (EPC)

DE FR GB

EPO simple patent family

WO 9963399 A1 19991209; CA 2333989 A1 19991209; EP 1084444 A1 20010321; JP 2002517783 A 20020618

INPADOC legal status


2001-05-16 [18W] WITHDRAWN

- Date of withdrawal: 20010322

2001-03-21 [17P] REQUEST FOR EXAMINATION FILED

- Effective date: 20001127

2001-03-21 [AK] DESIGNATED CONTRACTING STATES:

- Kind Code of Ref Document: A1

- Designated State(s): DE FR GB