Plasma screen with enhanced contrast

• US 20020167275A1
• Filed: 04/30/2002
• Published: 11/14/2002
• Est. Priority Date: 08/30/2000
• Status: Active Grant

• Current Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Original Assignee: Koninklijke Philips Electronics N.V. (Koninklijke Philips N.V.)
• Inventors: Bechtel, Hans-Helmut, Busselt, Wolfgang, Opitz, Joachim, Glaeser, Harald
• Granted Patent: US 6,750,610 B2
• Time in Patent Office: Days
• US Class Current: 313/587
• CPC Class Codes: H01J 11/12 with main electrodes provided on both sides of the discharge space
• CPC Class Codes: H01J 11/44 Optical arrangements or shielding arrangements, e.g. filters, black matrices, light reflecting means or electromagnetic shielding means
• CPC Class Codes: H01J 2211/442 Light reflecting means; Anti-reflection means
• CPC Class Codes: H01J 2211/444 Means for improving contrast or colour purity, e.g. black matrix or light shielding means

Abstract

The invention relates to a plasma screen having a structured black matrix (8) which is coated with a reflecting layer (9) on the side turned away from the viewer. Visible light incident from outside is absorbed by the black matrix (8) and light incident from inside is reflected by the reflecting layer (9). This enhances the LCP value of the whole plasma screen.

Claims

1. A plasma screen comprising a front plate (1) which comprises a glass plate (3) on which a dielectric layer (4) and a protective layer (5) are deposited, comprising a carrier plate (2) coated with a fluorescent layer (11) having a rib structure (14), which divides the space between front plate (1) and carrier plate (2) in plasma cells which are filled with a gas, and comprising one or more electrode arrays (6, 7, 12) on the front plate (1) and the carrier plate (2) for generating silent electrical discharges in the plasma cells and comprising a structured black matrix (8) which is coated with a reflecting layer (9) between dielectric layer (4) and protective layer (5) on the side turned away from the viewer.