US 5,793,158 A · Gas discharge (plasma) displays

Abstract

A gas discharge display panel incorporating phosphor protected by undercoats and overcoats. The device is comprised of a pair of substrates, each of which has an electrode array thereon with the dielectric coating on at least one of the electrode arrays. An array of channels having sidewalls is formed in the dielectric layer with an array of channels corresponding to and aligned with one of the electrode arrays. The channels have sidewalls and lands between channels with a protective undercoat on the channel sidewalls and a photoluminescent phosphor on the protective undercoat. Due to the sloping nature of the sidewalls and the photoluminescent phosphors being sandwiched between the protective undercoat and overcoat and the channel walls in which the phosphor is placed outside the path of charged particles produced on discharge but close or near the site of the UV production, the arrangement significantly enhances the light output because the phosphor surfaces are greater in extent area wise and are closer to the UV sources in the discharge and are not in the path of the discharge products. Since the light is produced in two spaced areas of phosphor by the UV produced on discharge, more light is produced and electrodes have less attenuating effect on visible light emission from each side.

Claims10

Dependent claims

A gas discharge matrix display device comprising:

a first substrate and a first electrode array on a first surface of said first substrate, a first dielectric layer on said first surface and said first electrode array,
a second substrate having a second surface and a second electrode array on said second surface, a second dielectric layer on said second surface of said second substrate and said second electrode array,
an array of channels formed in one of said dielectric layers, said array of channels corresponding to and aligned with one of said electrode arrays, each channel having channel sidewalls, lands between each channel, respectively, a protective undercoat on said channel sidewalls, a photoluminescent phosphor on said protective undercoat on said channel sidewalls and a protective overcoat on said photoluminescent phosphor such that said phosphor is sandwiched between said undercoat and said overcoat, said channel sidewalls on which said phosphor is placed being outside the path of charged particles produced on discharge and near the site of UV production thereby,
a seal region on each of said substrates, respectively,
means joining said substrates together at said seal regions with said electrode arrays orthogonally related, said lands maintaining a uniform spacing between said electrode arrays and optically isolating said channels from each other, and
a gaseous discharge medium filling said channels.

3 more elements

Dependencies are inferred from the claim text.

Gas discharge (plasma) displays

Life of this patent

Gas discharge (plasma) displays

Life of this patent

Abstract

Claims10