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EP0635865A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Field-emission display

Assignee: Sony Corp
•
Filing: 1994-07-20
•
Granted: —
•
Expires: 2014-07-20
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Abstract

Abstract A field-emission display has a phosphor panel assembly comprising a transparent electrode (12), a plurality of coated phosphor layers (15) disposed on said transparent electrode (12) for emitting light in response to bombardment of electron beams emitted from field-emission cathodes, a plurality of black insulating layers (13) disposed between said coated phosphor layers (15), and a plurality of conductive layers (14) disposed on said black insulating layers (13), respectively, between said coated phosphor layers (15) and electrically insulated from said transparent electrode (12) by said black insulating layer (13). The black insulating layers (13) provide a black mask between the phosphor layers to improve the contrast ratio, and the conductive layers are effective to increase the percentage of electron beam utilization, thus improving the quality and resolution of displayed images. These advantages can be achieved without making image display unstable due to charging-up of the black mask and straying of secondary electrons.

Inventors

  • 👤 Toshio Ohoshi
  • 👤 Tadashi Kiyomiya
  • 👤 Masami Okita

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-08 09:12
CPC Classifications
H; H01; H01J; H01J1/00; H01J1/02; H01J1/30; H01J31/00; H01J31/08; H01J31/10; H01J31/12; H01J31/123; H01J29/00; H01J29/02; H01J29/08; H01J29/085; H01J29/46; H01J29/58

Claims Analysis

Total Claims: 3
Claim 1
Independent Claim 91 words
A field-emission display comprising: a plurality of field-emission cathodes for emitting electron beams; and a phosphor panel assembly comprising a transparent electrode, a plurality of coated phosphor layers disposed on said transparent electrode for emitting light in response to bombardment of the electron beams emitted from said field-emission cathodes, a plurality of black insulating layers disposed between said coated phosphor layers, and a plurality of conductive layers disposed on said black insulating layers, respectively, between said coated phosphor layers and electrically insulated from said transparent electrode by said black insulating layer.
Claim 2
Dependent Claim 27 words
A field-emission display according to claim 1, wherein a voltage Vf lower than a potential Vp applied to said transparent electrode is applied to said conductive layers.
Claim 3
Dependent Claim 65 words
A field-emission display according to claim 1, wherein said coated phosphor layers comprise color coated phosphor layers, further comprising color selecting means for switching between electron beams applied to said color coated phosphor layers, and wherein a voltage Vf applied to said conductive layers is modulated depending on the switching by said color selecting means between electron beams applied to said color coated phosphor layers.

References Cited (Backward Citations)

JPS59169282A Cited
US4908539A Cited
EP0404022A2 Cited
EP0527240A1 Cited

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