JPH02119031A - Display element - Google Patents

Abstract

PURPOSE:To enlarge the area of a phosphor so as to obtain a display element having high brightness, by forming a SiO2 layer having excellent adhesion to the phosphor on a protective layer. CONSTITUTION:A first phosphor layer 21 is formed on one-side inner wall 7 of a receptacle having discharge gas 2 charged therein, and then plural discharging electrodes 22 are formed in the shape of a matrix on the other-side inner wall 4 for being embedded by an insulating layer 5. The insulating layer 5 is covered with an electrode protection oxide film 23 made of a secondary electron emitting material, Mgtheta or Y2O3 for allowing the oxide film to contribute to the maintenance of electric discharge, and then a second phosphor layer 25 is deposited and formed above the oxide film via a SiO2 layer 24 having its thickness of 500 angstrom or so. Each voltage is applied to each of the electrodes 22 to cause electric discharge in the discharge gas 2 above each of intersecting points of the electrode matrix. Each output light from the second phosphor layer 25 is synthesized with each output light from the first phosphor layer 21 so that the synthesized light reaches a luminous plane 9 to raise the brightness of the element in the title.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to improvements in display elements such as plasma displays and fluorescent display tubes.

[Conventional technology]

In recent years, plasma displays such as full-color plasma displays and flat fluorescent lamps (fluorescent display tubes) have become popular.
The development of display elements is in full swing. These devices emit light by exciting the phosphor with ultraviolet rays in the vacuum ultraviolet region generated by rare gas discharge.

Figure 3 is a diagram showing the cross-sectional structure of a full-color plasma display reported in IEICE Research Report 8B (388), pages 49-52, 1987. In the figure, (1) is a discharge vessel; (2) is the discharge gas sealed in this container (1), and (3) is the inner wall (4) of the container (1).
A plurality of metal electrodes as discharge electrodes are provided in a matrix on the side, and each metal electrode (3) is insulated by an insulating layer (5). (6) is a phosphor that is excited and emits light by ultraviolet rays in the vacuum ultraviolet region, and is provided on the inner wall (7) of the discharge vessel (1) facing the metal electrode (3). (8) is a protective layer provided on the surface side of the insulating layer (5), and is composed of Mg, which is a material with a high secondary electron emission rate.
O, Y, 03, etc. are used.

A conventional full-color plasma display is constructed as described above, and includes an insulating layer (5) on the inner wall (4) side of the discharge vessel (1).
) When a voltage is applied to the metal electrodes (3) embedded in a matrix shape to locally discharge the discharge gas (2) on the matrix intersections, vacuum ultraviolet rays are generated from this gas (2). This ultraviolet light causes the discharge vessel (1) directly above
The phosphor (6) provided on the inner wall (7) on the opposite side is excited and emits light. The light from the phosphor (6) is transmitted to the discharge vessel (
1) and reaches the light emitting surface (9).

[Problem to be solved by the invention]

Although the conventional full-color plasma display is constructed as described above, it is desirable to increase the area of the phosphor (6) in order to achieve higher brightness. However, because the adhesion between the protective layer (8) made of Y2O or MgO, which is a secondary electron emitting material, and the phosphor is weak, the phosphor (6) is not formed on the surface of the metal electrode 8i (3). Therefore, it was difficult to achieve high brightness.

The present invention has been made to solve the above-mentioned problems, and an object of the present invention is to provide a display element that can realize high brightness by providing a phosphor also on a protective layer to increase the area of the phosphor. .

[Means to solve the problem]

A display element according to the present invention includes a discharge vessel filled with a discharge gas and provided with a first phosphor layer on one inner wall, and an electrode provided on the other inner wall of the discharge vessel and embedded in an insulating layer. , a protective layer covering the insulating layer, and a SIN layer on the protective layer.
and a second phosphor layer provided via two layers.

[Effect]

In the present invention, Sin, which has good adhesion to the phosphor,
Since 5i02 is provided on the protective layer, this 5i02 serves to connect the phosphor and the protective layer in the middle, and the phosphor can be provided on the protective layer.

(Example) The structure of the dielectric electrode of the display element according to the present invention is such that by forming a thin Sin2 layer on the oxide layer of the secondary electron emitting material, It is also possible to form a phosphor.

An embodiment of the present invention will be described below with reference to FIG. Figure 1 is a cross-sectional view of a full-color plasma display among display elements. In the figure, (1) is a discharge vessel filled with discharge gas (2) as in Figure 3 above;
7) is provided with a first phosphor layer (21) made of the same phosphor as described above. (22) is the discharge vessel (
A plurality of electrodes for discharging are provided in a matrix on the other inner wall (4) side of 1), and metal is used in this embodiment. The electrodes (22) are embedded in the insulating layer (5) and are insulated from each other. (23) is a protective layer as an electrode protective oxide film that covers the insulating layer (5), and is made of MgO or Y2O3, which is a secondary electron emitting material, and emits secondary electrons when ions generated by discharge are incident on it. The electrode (22) is provided to protect the electrode (22) from ion bombardment and to contribute to sustaining the discharge. (24) is a thin 5i02 layer uniformly formed on this protective layer (23), and the thickness of the layer is preferably 500, for example. (2
5) is a second phosphor layer provided on the protective layer (23) via the 5i (h layer (24)), in which the same phosphor as described above is
in, by coating on layer (24). Note that (9) is the light emitting surface of the discharge vessel (1). Therefore, in this example, a layer (24) of 500 ions of Si, uniformly formed on a protective layer (23) made of Y2O3 or MgO, is a layer (24) of 500 nm thick formed on a protective layer (23) made of Y2O3 or MgO. By fixing the layer (25), the discharge vessel (1)
A phosphor is attached to the inner electrode (22) side.

Therefore, in the display element according to the present example configured as described above, when a voltage is applied to the electrode (22) and the discharge gas (2) is locally discharged on the matrix intersection points, as in the prior art, Vacuum ultraviolet rays are generated from this discharge gas (2), and the first and second phosphor layers (
The phosphors 21) and (25) are excited and emit light. Then, the light from the first phosphor layer (21) reaches the discharge vessel (1).
The light from the second phosphor Fl (25) reaches the light emitting surface (9) as in the conventional case.
The light passes through the phosphor layer (21) and the discharge vessel (1), is combined with the light from the first phosphor layer (21), and is emitted onto the light emitting surface (
9). Thereby, the brightness of the light emitting surface (9) can be increased.

In this example, the thickness of the Sin2 layer (24) is 500 mm.
Although the thickness is set to 500 Å or more, the film thickness may be 500 Å or more or less than 500 Å as long as it does not have an adverse effect such as cracks on the protective layer (23).

FIG. 2 is a sectional view of a flat fluorescent lamp showing another embodiment of the present invention. In the above embodiment, the surface of the insulating layer (5) was not provided with any unevenness, but in this embodiment, the electrode ( 22), a protrusion (26) is formed on the insulating layer (5) and the 5i02 layer (24).

In each of the above embodiments, the display element is a panel-shaped discharge tube such as a full-color plasma display or a flat fluorescent lamp, but other display elements may be used, and the display element is not limited to a panel-shaped one. Moreover, the material of the electrode (22) may be other than metal.

(Effects of the Invention) As explained above, the present invention provides a 5i02 layer on the surface of the protective layer covering the insulating layer of the electrode.
It is also possible to attach the phosphor to the surface of the in2 layer to increase the area of the phosphor, resulting in a display element with higher brightness.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing the internal structure of a full-color plasma display according to one embodiment of the present invention, FIG. 2 is a cross-sectional view of a flat fluorescent lamp according to another embodiment of the present invention, and FIG. First cross-sectional view of a full-color plasma display
It is a figure equivalent figure. (1)... Discharge vessel (4)... Other inner wall (5... Insulating layer (7... One inner wall 21...・First phosphor layer 22...Electrode 23...Protective layer 24...Sin, layer 25...Second phosphor layer The same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Claims] A discharge vessel in which a discharge gas is sealed and a first phosphor layer provided on one inner wall, an electrode provided on the other inner wall of the discharge vessel and embedded in an insulating layer, and a protection covering the insulating layer. and a second phosphor layer provided on the protective layer with an SiO_2 layer interposed therebetween.