Global patent index - EP 1004053 A1

EP 1004053 A1 2000-05-31 - DISPLAY WITH A DIELECTRIC STACK FILTER

Title (en)

DISPLAY WITH A DIELECTRIC STACK FILTER

Title (de)

ANZEIGE MIT EINEMIELEKTRISCHEN STAPELFILTER

Title (fr)

AFFICHAGE COMPORTANT UN FILTRE A EMPILEMENT DIELECTRIQUE

Publication

EP 1004053 A1 (EN)

Application

EP 98938788 A

Priority

  • GB 9802413 W
  • GB 9717394 A

Abstract (en)

[origin: WO9909452A1] A display has a modulator, preferably a liquid-crystal cell, adapted to modulate activating UV light (23, 25) input from the rear of the cell on to phosphor-type output elements (7) at the viewer side of the cell, and a pre-collimating device (11) such as a prismatic sheet for partially collimating the input light before it reaches the cell, in order to improve the contrast of the liquid-crystal modulator. In the invention a further collimator is included in the form of a dielectric stack filter (9) between the cell (1) and the output elements (7). This filter is tuned to block the essentially monochromatic input light (25a) emerging from the cell at angles greater than a predetermined angle to the normal to the cell, and also acts to block the passage of light at visible wavelengths. This ensures a good light throughput while eliminating the most harmful (i.e. contrast-degrading) off-axis rays.

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

G02F 1/1335

IPC 8 full level (invention and additional information)

G02B 5/23 (2006.01); G02B 5/28 (2006.01); G02F 1/1335 (2006.01); G02F 1/13357 (2006.01); G09F 9/00 (2006.01); G09F 9/30 (2006.01)

CPC (invention and additional information)

G02F 1/133617 (2013.01)

Citation (search report)

See references of WO 9909452A1

Designated contracting state (EPC)

DE FR GB NL

EPO simple patent family

WO 9909452 A1 19990225; AU 8739298 A 19990308; CN 1276067 A 20001206; EP 1004053 A1 20000531; GB 9717394 D0 19971022; JP 2001516066 A 20010925

INPADOC legal status

2002-03-13 [18W] WITHDRAWN

- Ref Legal Event Code: 18W

- Date of withdrawal: 20020119

2001-09-19 [RAP1] TRANSFER OF RIGHTS OF AN EP PUBLISHED APPLICATION

- Owner name: QINETIQ LIMITED

- Ref Legal Event Code: RAP1

2000-05-31 [17P] REQUEST FOR EXAMINATION FILED

- Ref Legal Event Code: 17P

- Effective date: 20000301

2000-05-31 [AK] DESIGNATED CONTRACTING STATES:

- Ref Legal Event Code: AK

- Designated State(s): DE FR GB NL