DISPLAY

Abstract

To improve luminescence life, linearity of emission luminescence, and colority of an electron beam excitation display of thin flat type. The electron beam excitation display of thin flat type has a rear plate provided with a plurality of first electrodes in parallel with one another, a plurality of second electrodes in parallel with one another and orthogonal to the first electrodes, and electron emitters placed at points of intersection or near the points of intersection of the first electrodes and the second electrodes and a faceplate formed with a phosphor layer. By using a blue-emitting phosphor formed by mixing a blue-emitting phosphor ZnS:Ag and a blue-emitting phosphor CaMgSi2O6:Eu for the phosphor layer, the electron beam excitation display of thin flat type improved in luminescence life, linearity of emission luminescence, and colority that have been left unsolved is provided.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a graph showing curves of luminescent maintenance factors of phosphor layers of the present invention;

FIG. 2 is a graph showing the curves of luminescent maintenance factors of phosphor layers of the present invention;

FIG. 3 is a schematic plan view of a display panel in Example 15 of the present invention;

FIG. 4 is a schematic cross sectional view of the display panel in Example 15 of the present invention;

FIG. 5A is a schematic cross sectional view of a portion of the display panel in Example 15 of the present invention;

FIG. 5B is a schematic cross sectional view in the orthogonal direction of the portion of the display panel in Example 15 of the present invention;

FIG. 6 is a schematic diagram showing an entire structure of a display with Spindt type electron source of the present invention; and

FIG. 7 is a schematic diagram showing an entire structure of a display with carbon nanotube type electron source.

Claims

1. A display comprising: a rear plate having a plurality of first electrodes in parallel with one another, a plurality of second electrodes in parallel with one another and orthogonal to the first electrodes, and electron emitters placed at points of intersection or near the points of intersection of the first electrodes and the second electrodes; anda faceplate formed with a phosphor layer and opposite to the rear plate, wherein as the phosphor layer, a blue-emitting phosphor layer containing a blue-emitting phosphor CaMgSi2O6:Eu and a blue-emitting phosphor ZnS:Ag is used.

2. The display according to claim 1, wherein the median diameter of the blue-emitting phosphor CaMgSi2O6:Eu and the median diameter of the blue-emitting phosphor ZnS:Ag are approximately the same.

3. The display according to claim 1, wherein the median diameter of the blue-emitting phosphor CaMgSi2O6:Eu is 70% or more of the median diameter of the blue-emitting phosphor ZnS:Ag.

4. The display according to claim 1, wherein the median diameter of the blue-emitting phosphor CaMgSi2O6:Eu is 3 μm or larger and 8 μm or smaller.

5. The display according to claim 1, wherein the mixing ratio of the blue-emitting phosphor CaMgSi2O6:Eu is 20% by weight or more of the blue-emitting phosphor ZnS:Ag.

6. The display according to claim 1, wherein a blue-emitting phosphor layer in which at least one kind of element selected from the group consisting of Group IIA, Group IIB, and Group IVB is added to the blue-emitting phosphor CaMgSi2O6:Eu is used.

7. The display according to claim 1, wherein a blue-emitting phosphor layer in which at least one kind of element selected from the group consisting of Group IIA, Group IIB, Group VIB, Group IB, and Group IIIB is added to the blue-emitting phosphor ZnS:Ag is used.

8. The display according to claim 1, wherein a phosphor forming the phosphor layer contains at least one kind of minute impurity selected from the group consisting of Group IA, Group VIIB, and rare earth.

9. The display according to claim 1, wherein the luminescence spectrum of the blue-emitting phosphor ZnS:Ag shows a shoulder around 400 nm (3.10 eV).

10. The display according to claim 1, wherein the luminescence intensity at 400 nm (3.10 eV) in the luminescence spectrum of the blue-emitting phosphor ZnS:Ag is 2.5-fold or more of the intensity obtained by fitting a Gaussian curve.

11. A method for producing a display according to claim 1, comprising: producing a blue-emitting phosphor ZnS:Ag by annealing at a processing temperature of 100 to 600 degrees C. in an atmosphere containing sulfur to decrease the sulfur vacancy concentration thereof; andmixing the blue-emitting phosphor ZnS:Ag with a blue-emitting phosphor CaMgSi2O6:Eu.

12. The display according to claim 1, wherein the median diameter of the blue-emitting phosphor CaMgSi2O6:Eu is 50% or more of the median diameter of the blue-emitting phosphor ZnS:Ag.

13. The display according to claim 1, wherein the median diameter of the blue-emitting phosphor CaMgSi2O6:Eu is 200% or less of the median diameter of the blue-emitting phosphor ZnS:Ag.

14. The display according to claim 1, wherein the accelerating voltage of electron beam emitted from the electron emitter to the phosphor layer is 1 kV or higher and 15 kV or lower.