Display device

Abstract

A flat panel display device is provided which prevents color mixture of the phosphor surface thereof to promote high brightness and longer operation life.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

FIGS. 1A and 1B are views for assistance in explaining an embodiment of a flat panel display device according the present invention, in which FIG. 1A is a schematic plan view as viewed from the side of the front substrate, and FIG. 1B is a schematic side view of FIG. 1A;

FIG. 2 is a schematic plan view taken along line A-A of FIG. 1B;

FIGS. 3A to 3C are views for assistance in explaining an electron source of the flat panel display device of the present invention by way of example;

FIG. 4 is a schematic plan view illustrating the relationship between the electron sources and the apertures;

FIG. 5 includes a schematic cross-sectional view of the back substrate taken along line B-B of FIG. 2 and a schematic cross-sectional view of a portion of a front substrate corresponding to the back substrate;

FIG. 6 is a schematic plan view for assistance in explaining another embodiment of the flat panel display device according to the present invention;

FIG. 7 is a schematic plan view illustrating the relationship between the electron sources and the apertures;

FIG. 8 is a schematic plan view for assistance in explaining yet another embodiment of the flat panel display device according to the present invention;

FIG. 9 is a schematic plan view corresponding to FIG. 2 with the front substrate of FIG. 8 removed;

FIGS. 10A, 10B and 10C are schematic diagrams for assistance in explaining an electron source constituting a pixel of the flat panel display device according to the present invention;

FIG. 11 is a schematic plan view illustrating the relationship between the electron sources and the apertures;

FIGS. 12A to 12C are schematic plan views for assistance in explaining other embodiments of the flat panel display device of the present invention;

FIG. 13 is a schematic plan view for assistance in explaining still another embodiment of the flat panel display device according to the present invention;

FIGS. 14A to 14D are schematic plan views for assistance in explaining other embodiments of the flat panel display device according to the present invention; and

FIG. 15 is a diagram for assistance in explaining an equivalent circuit of the flat panel display device to which the configurations of the present invention is applied.

Claims

1. A display device comprising: a back substrate including: a plurality of first lines which extends in a first direction and are juxtaposed to each other in a second direction crossing the first direction;a plurality of second lines which extend in the second direction and are juxtaposed to each other in the first direction;an insulating film interposed between the first lines and the second lines; anda plurality of electron sources connected to the first lines and to the second lines;a front substrate arranged to be opposed to the back substrate with a desired interval spaced apart from the back substrate, the front substrate including: a black matrix film formed with a plurality of apertures in a surface thereof facing the back substrate;a phosphor film covering the apertures; anda metal back layer covering the phosphor film; anda support frame interposed between the back substrate and the front substrate and arranged to surround an image display area;wherein the electron source has an upper portion and a lower portion which are different from each other in width.

2. The display device according to claim 1, wherein electron sources adjacent to each other have respective surfaces different from each other in gravity center position, the respective surfaces facing the corresponding apertures.

3. The display device according to claim 2, wherein a portion of the aperture having a maximum width in the second direction is closer to the gravity center position than another portion having a minimum width thereof in the second direction.

4. The display device according to claim 1, wherein the aperture has portions different from each other in width along the second direction.

5. The display device according to claim 1, wherein the apertures adjacent to each other in the second direction are different from each other in gravity center position.

6. The display device according to claim 1, wherein a portion of the aperture having a maximum width along the second direction is closer to the gravity center position than another portion having a minimum width along the second direction.

7. The display device according to claim 1, wherein a gravity center position of a surface, facing the aperture, of the electron source is substantially coaxial with a gravity center position of the aperture facing the electron source.

8. The display device according to claim 1, wherein the aperture and the electron source have respective maximum widths in the same direction from respective gravity centers thereof.

9. The display device according to claim 1, wherein the electron source has an almost-triangular surface opposed to the aperture.

10. The display device according to claim 1, wherein the aperture is almost trapezoidal.

11. The display device according to claim 1, wherein the aperture has a shape combining a trapezoid with a rectangle.

12. The display device according to claim 1, wherein the electron source including a lower electrode, an upper electrode and an electron acceleration layer put between the upper electrode and the lower electrode is a thin film type electron source array in which electrons are emitted from the upper electrode by applying voltage between the lower electrode and the upper electrode.

13. The display device according to claim 1, wherein the electron source is an electron emission element provided with a conductive film having an electron emission portion.

14. The display device according to claim 1, wherein the electron source comprises at least a carbon nanotube.

15. A display device comprising: a back substrate including: a plurality of first lines which extend in a vertical direction and are juxtaposed to each other in a horizontal direction;a plurality of second lines which extend in the horizontal direction and are juxtaposed to each other in the vertical direction;an insulating film interposed between the first lines and the second lines; anda plurality of electron sources each of which is provided near a crossing portion between the first line and the second line and are each connected to the first line and to the second line;a front substrate including: a black matrix film having a plurality of apertures; anda phosphor film covering the apertures; anda support frame interposed between the back substrate and the front substrate so as to surround a display area with an interval between the back substrate and the front substrate maintained at a predetermined clearance;wherein the aperture of the black matrix film has a vertical length at the horizontal center portion thereof greater than that at both horizontal ends.

16. The display device according to claim 15, wherein the aperture is substantially polygonal.

17. The display device according to claim 15, wherein the aperture is substantially oval.

18. The display device according to claim 15, wherein the aperture has a shape combining a trapezoid with a rectangle.