Gas discharge display apparatus

Abstract

In a gas discharge display apparatus, a dielectric layer overlies the row electrode pairs provided between the opposing front and back glass substrates placed across the discharge space. A protective layer for the dielectric layer includes a crystalline MgO layer that has a property causing a cathode-luminescence emission having a peak within a wavelength range of 200 nm to 300 nm upon excitation by electron beams. A red phosphor layer generating visible light by being excited by vacuum ultraviolet light includes a mixed phosphor of a first phosphor of (Y, Gd)BO3:Eu or the like which is a borate-system red phosphor and a second phosphor of Y(V, P)O4:Eu which is a phos-vana system red phosphor.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a front view illustrating an example of an embodiment according to the present invention.

FIG. 2 is a sectional view taken along the V-V line in FIG. 1.

FIG. 3 is a sectional view taken along the W-W line in FIG. 1.

FIG. 4 is a sectional view illustrating a crystalline magnesium layer formed on a thin-film magnesium layer in the embodiment example.

FIG. 5 is a sectional view illustrating a thin-film magnesium layer formed on a crystalline magnesium layer in the embodiment example.

FIG. 6 is a SEM photograph of the magnesium oxide single-crystal having a cubic single-crystal structure.

FIG. 7 is a SEM photograph of the magnesium oxide single-crystal having a cubic polycrystal structure.

FIG. 8 is a graph showing the relationship between the particle size of a magnesium oxide single-crystal and the wavelengths of a CL emission in the embodiment example.

FIG. 9 is a graph showing the relationship between the particle size of a magnesium oxide single-crystal and the intensities of a CL emission at 235 nm in the embodiment example.

FIG. 10 is a graph showing the state of the wavelength of a CL emission from a magnesium oxide layer formed by vapor deposition.

FIG. 11 is a graph showing the relationship between the discharge delay and the peak intensities of a CL emission at 235 nm from the magnesium oxide single-crystal.

FIG. 12 is a graph showing a comparison of the discharge delay characteristics between the case when the protective layer is constituted only of the magnesium oxide layer formed by vapor deposition and that when the protective layer has a double layer structure made up of a crystalline magnesium layer and a thin-film magnesium layer formed by vapor deposition.

FIG. 13 is a graph showing a comparison of luminance residual image evaluations.

FIG. 14 is a graph showing a comparison of the voltage drift between the PDP according to the embodiment of the present invention and a conventional PDP.

FIG. 15 is a table showing a comparison of the voltage drift.

FIG. 16 is a graph showing a comparison of the luminance drift between the PDP according to the embodiment of the present invention and a conventional PDP.

FIG. 17 is a table showing a comparison of the luminance drift.

FIG. 18 is a graph showing a comparison of the voltage residual image between the PDP according to the embodiment of the present invention and a conventional PDP.

FIG. 19 is a table showing a comparison of the voltage residual image.

FIG. 20 is a graph showing a comparison of the total amount of gas generated from phosphor.

FIG. 21 is a graph showing a comparison of the partial pressures of gases generated from phosphor.

Claims

1. A gas discharge display apparatus comprising a pair of substrates facing each other across a discharge space; row electrode pairs and column electrodes which are placed between the pair of substrates, each row electrode pair and each column electrode being positioned at distance from each other and extending in directions at right angles to each other to form unit light emission areas in positions corresponding to the intersections in the discharge space; a dielectric layer overlying the row electrode pairs; a protective layer overlying the dielectric layer and facing the unit light emission areas; and red, green and blue colored phosphor layers that generate visible light by being excited by vacuum ultraviolet light, wherein the discharge space is filled with a discharge gas,the protective layer includes a magnesium oxide crystal that has a crystalline structure causing a cathode-luminescence emission having a peak within a wavelength range of 200 nm to 300 nm upon excitation by electron beams, andat least one phosphor layer of the red, green and blue colored phosphor layers includes a phosphor made by mixing together a first phosphor and a second phosphor generating lower amounts of reduction gas and carbonization gas than that generated by the first phosphor.

2. The gas discharge display apparatus according to claim 1, wherein the at least one phosphor layer is the red colored phosphor layer.

3. The gas discharge display apparatus according to claim 2, wherein the first phosphor included in the red colored phosphor layer is a borate-system red phosphor and the second phosphor included therein is a phosphorus-vanadium system red phosphor.

4. The gas discharge display apparatus according to claim 3, wherein the first phosphor is (Y, Gd)BO3:Eu and the second phosphor is Y(V, P)O4:Eu.

5. The gas discharge display apparatus according to claim 2, wherein the mixed phosphor included in the red phosphor layer includes 20 wt % to 80 wt % of the second phosphor.

6. The gas discharge display apparatus according to claim 1, wherein the protective layer comprises a thin-film magnesium oxide layer deposited by vapor deposition or by sputtering, and a crystalline magnesium oxide layer including a magnesium oxide crystal and deposited and laminated on the thin-film magnesium oxide layer.

7. The gas discharge display apparatus according to claim 1, wherein the magnesium oxide crystal is a magnesium oxide single-crystal produced by a vapor-phase oxidization technique.

8. The gas discharge display apparatus according to claim 1, wherein the magnesium oxide crystal has a crystalline structure causing a cathode-luminescence emission having a peak within a wavelength range of 230 nm to 250 nm.

9. The gas discharge display apparatus according to claim 1, wherein the magnesium oxide crystal has a particle diameter of 2000 or more angstroms.

10. The gas discharge display apparatus according to claim 1, wherein the discharge gas includes 10% or more xenon by volume.

11. The gas discharge display apparatus according to claim 1, wherein the dielectric layer includes a leadless glass material having a relative dielectric constant of 8 or less.