Plasma display screen comprising a red phosphor

US6509685B1 · kind B1 · utility

Assignee

• KONINKLIJKE PHILIPS ELECTRONICS NV · NL

Inventors

• Thomas Justel · Witten, DE
• Hans Nikol · Aachen, DE
• Helmut Bechtel · Aachen, DE
• Cornelis Reinder Ronda · Aachen, DE

Key dates

• Filing date: Oct 27, 2000
• Grant date: Jan 21, 2003
• Expiry date: Feb 24, 2021

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01J2211/42
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

A plasma display screen including a carrier plate, a transparent front plate, a ribbed structure which divides the space between the carrier plate and the front plate into plasma cells, which are filled with a gas, and including one or more electrode arrays for generating corona discharges in the plasma cells, and including a phosphor layer which includes a phosphor for generating red radiation selected from the group formed by rare earth metal borates of the general formula EA M11-x-yM2xEuyB9O16, where EA=Ca, Sr, Ba; M1=Gd, La; M2=Y, Lu, Sc, In and 0<x&lE;0.5, 0.01&lE;y&lE;0.4, and M31-r-sYrEusBO3, where M3=Sc,, In, Lu and 0.01&lE;r&lE;0.99, 0.01&lE;s&lE;0.15, is characterized by a red point which has shifted in the direction of a higher color saturation. In addition, the color contrast at brighter ambient lighting conditions is increased.