U.S. Philips Corporation

Koninlijke Philips Electronics N.v.

Friederike Picht

Hans-Otto Jungk

Joachim F Opitz

Jacqueline Merikhi

Wolfram Czarnojan

Miguel Boutelje

Frans H Vollebregt

Claus Feldmann

Michael Bredol

Gerard H J Van Iersel

Roel Van De Belt

Pierre L H M Cobben

Antonius A M Van Weert

Anne M A Van Dongen

Jan W De Bakker

Alexandra J Heijden

Arlis G Van Braam

A display screen, in particular a color display screen for a cathode ray tube, comprises a phosphor layer which includes a phosphor composition of a phosphor with a coating comprising a water-soluble organic binder, which is selected from the group formed by the polyurethanes, polyacrylamides, polyamide resins, etherified melamine compounds and melamine-formaldehyde compounds, and etherified urea-formaldehyde resins, and comprising oxygen compounds of one or more elements selected from the group formed by the alkaline earth elements and zinc. Important advantages obtained are a substantially improved sieving behavior of the phosphor powder, an increased adhesion of pigment particles to the phosphor grains, an improved suspension stability as well as an improved adhesion of the phosphor to the display screen glass.

Phosphor composition comprising an amide group-containing or urethane group-containing organic binder

A display screen comprising a phosphor composition which includes a phosphor and a phosphor coating with a group of metal-oxygen compounds, the group of metal-oxygen compounds containing an yttrium-oxygen compound, is characterized by a surprising improvement in picture brightness, color purity and adhesion of the phosphor composition to the glass of the display screen. The phosphor layer exhibits a high packing density of the phosphor material. The phosphor layer further exhibits a good homogeneity and is free from &ldquo;pinholes&rdquo;. In addition, the structured phosphor layer shows a high definition.

Display screen comprising a metal oxide-containing phosphor composition

The invention relates to a display screen having a phosphor layer of a phosphor composition of a phosphor coated with an oxygen compound of one of the elements magnesium, calcium, barium, zinc and aluminium, and with colloidal SiO.sub.2 having an average particle size of 70 nm.ltoreq.d.ltoreq.130 nm. The invention further relates to a phosphor composition of a phosphor coated with an oxygen compound of one of the elements magnesium, calcium, barium, zinc and aluminium, and with colloidal SiO.sub.2 having an average particle size of 70.ltoreq.d.ltoreq.130 nm, and to a method of manufacturing the phosphor composition.

Phosphor composition with a coating of colloidal SiO.sub.2 particles and

A display screen having a phosphor coating comprising a phosphor composition of a phosphor provided with a coating which comprises one or more oxgyen compounds of the elements zinc, aluminium, magnesium, calcium and barium as well as colloidal SiO.sub. particles, said colloidal SiO.sub.2 particles being composed of SiO.sub.2 particles having an average size of 4 nm.ltoreq.d.ltoreq.30 nm, corresponding to a specific surface of 100 m.sup.2 /g.ltoreq.A.sub.s .ltoreq.550 nm m.sup.2 /g, and SiO.sub.2 particles having an average size of 50 nm.ltoreq.d.ltoreq.150 nm, corresponding to a specific surface of 25 m.sup.2 /g.ltoreq.A.sub.s .ltoreq.70 m.sup.2 /g.

Phosphor composition comprising fine-grain and coarse-grain SiO.sub.2

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Düren, Germany

Friederike Picht