EP 0412887 B1 19940706 - High efficiency cathodoluminescent screen for high luminance cathode ray tube.
Title (en)
High efficiency cathodoluminescent screen for high luminance cathode ray tube.
Title (de)
Mit hohem Wirkungsgrad kathodolumineszenter Schirm für hochleuchtende Kathodenstrahlröhre.
Title (fr)
Ecran cathodoluminescent à haute efficacité pour tubes à rayons cathodiques haute luminance.
Publication
Application
Priority
FR 8910828 A 19890811
Abstract (en)
[origin: EP0412887A1] The invention relates to a high efficiency cathodoluminescent screen for high luminance cathode ray tubes, the novel layout of which permits a significant improvement in luminance. <??>The cathodoluminescent screen of the invention comprises a glass substrate (11) carrying a luminescent screen (12) consisting of luminophore grains. According to a characteristic of the invention, an intermediate screen (15) is interposed between the luminescent screen (12) and the substrate (11), the intermediate screen (15) having a refractive index n1 markedly greater than the refractive index n0 of the substrate (11). This arrangement results in a significant part of the light which penetrates into the intermediate layer (15) being reflected towards the luminescent layer (12), in such a way that this light can later be scattered back towards the substrate (11), that is to say towards the end-use, with an emission indicatrix which is much more strongly concentrated on the axis than in the prior art. <??>The invention finds a particularly attractive application in so-called "projection" tubes. <IMAGE>
IPC 1-7
IPC 8 full level
H01J 29/18 (2006.01); H01J 29/28 (2006.01); H01J 31/10 (2006.01)
CPC (source: EP US)
H01J 29/185 (2013.01 - EP US); H01J 2229/8916 (2013.01 - EP US)
Designated contracting state (EPC)
DE FR GB NL
DOCDB simple family (publication)
EP 0412887 A1 19910213; EP 0412887 B1 19940706; DE 69010423 D1 19940811; DE 69010423 T2 19941020; FR 2650914 A1 19910215; JP H03129642 A 19910603; US 5101136 A 19920331
DOCDB simple family (application)
EP 90402235 A 19900803; DE 69010423 T 19900803; FR 8910828 A 19890811; JP 21143090 A 19900809; US 56568090 A 19900810