JPH0638361Y2 - Gas discharge fluorescent display panel - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention selectively discharges discharge cells arranged in a predetermined pattern to generate ultraviolet rays, and forms a fluorescent layer corresponding to the discharge cells. The present invention relates to a gas discharge fluorescent display panel which is excited to emit light and performs various displays in a desired pattern and color. In particular, by introducing a condenser lens corresponding to each fluorescent material layer, the brightness and contrast of the display are improved. The present invention relates to a gas discharge fluorescent display panel having improved.

[Prior Art] Conventionally, in such a gas discharge display panel, a front substrate and a rear substrate made of flat glass are opposed to each other at a predetermined interval, and the peripheral portions thereof are sealed with a sealing agent to form an airtight envelope. It has a structure in which a plurality of cathodes and anodes that are formed to face each other with a discharge interval therebetween are enclosed together with a discharge gas. Further, a discharge cell is formed in a portion where the cathode and the anode face each other, and a fluorescent material layer is formed in a portion corresponding to each discharge cell on the inner surface of the front substrate, which has a predetermined pattern such as a matrix shape or a parallel shape. It is arranged.

Thus, when a voltage is selectively applied between the cathode and the anode, a gas discharge is generated in the discharge cell located at a portion where the selected cathode and anode face each other, and ultraviolet rays generated by the discharge cause a glow. The photoconductor layer is excited to emit light, and the light is emitted to the outside through the front substrate to display a desired pattern and color.

[Problems to be solved by the invention] By the way, since the airtight envelope requires mechanical strength, the front substrate, which is a main constituent member of the envelope, is relatively thick with a thickness of about several mm. Things are used. Therefore,
The light emitted from the phosphor layer in a scattered form is partially diffused into the inside of the front substrate while passing through the front substrate, so that the amount of light is reduced and the display brightness is lowered. In addition, the phosphor layer usually has a whitish color, and since it is formed on the flat inner surface of the front substrate, external light is reflected at a certain angle and emitted to the outside through the front substrate. Therefore, there is a problem that the reflected light from the phosphor layer is visually observed over the light emission of the phosphor layer itself, and the display contrast is lowered.

The present invention has been devised in view of the above-mentioned point, and increases the brightness of the display by suppressing the diffusion of light into the front substrate, and further disperses the reflected light of the phosphor layer. It is an object of the present invention to realize a gas discharge fluorescent display panel which can obtain a clear display contrast.

[Means for Solving the Problems] In order to solve the above problems, a gas discharge fluorescent display panel of the present invention has an airtight envelope in which a front substrate having a light transmitting portion and a rear substrate are opposed to each other at a predetermined interval. Along with the formation, a plurality of cathodes and anodes are opposed to each other with a discharge gap therebetween, and this is enclosed together with a discharge gas in the airtight envelope to form discharge cells in the opposed portions of the cathodes and anodes, Further, a convex condenser lens is provided toward the discharge cell side at a portion corresponding to each discharge cell on the inner surface of the substrate, and a fluorescent substance layer is formed in a curved surface on the condenser lens surface. It is characterized by.

[Operation] Since the present invention is configured as described above, the light emitted from the phosphor layer is incident on the front substrate while being condensed by the condenser lens, and is hardly diffused inside the substrate. , Released to the outside. Also, external light that has entered the front substrate from the outside at a certain angle and reaches the fluorescent layer is reflected in four directions by the curved fluorescent layer, and a considerable part is diffused inside the front substrate. It

[Embodiment] An embodiment of the present invention will be described below with reference to the drawings.

1 and 2 show a gas discharge fluorescent display panel according to an embodiment of the present invention, which is a cutaway exploded perspective view and a sectional view, respectively.

In the figure, a gas discharge fluorescent display panel 1 has a front substrate 2 and a rear substrate 3 each made of a glass plate having a thickness of several mm, which are opposed to each other at a predetermined interval, and a peripheral portion thereof is a sealing agent such as frit glass. An airtight envelope 4 is formed by sealing with (not shown), and the surface is covered with an emitter material such as LaB ₆ or BaLaO _{3 to} form a truncated cone-shaped through hole 5a. A plurality of ribbon-shaped cathodes 5 and a plurality of rectangular rod-shaped anodes 6 are arranged to face each other with a discharge gap therebetween and are orthogonal to each other. It is enclosed in the enclosure 4.

The plurality of anodes 6 are placed in parallel on the back substrate 3, and the cathode 5 is placed thereon via the back spacer 7 having the matrix-shaped through holes 7a. Further, a front spacer 8 having a matrix of through holes 8a is interposed between the cathode 5 and the front substrate 2, and a discharge cell 9 is formed at a portion where the cathode 5 and the anode 6 face each other.

On the inner surface of the front substrate 2, a condenser lens 10 having a convex shape toward the discharge cell 9 is formed at a portion corresponding to the discharge cell 9, and the surface of the condenser lens 10 is fluorescent. Body layer 11
Is formed into a curved surface. In addition, in the portion where the condenser lens 10 is not formed, a light-shielding mask made of black gas is used.
12 is applied to make the contour of the display spot formed on the front substrate 2 clear.

In order to form the condensing lens 10, a resist is deposited on a portion corresponding to the discharge cell 9 on the inner surface of the front substrate 2 and an outer surface thereof, and the resist is chemically etched with hydrofluoric acid or the like, and its etching action Is used for over-etching, or a portion of the inner surface of the front substrate 2 corresponding to the discharge cell 9 is coated with a low melting point glass, which is heated and melted.
There is a method of forming a convex lens by utilizing the surface tension.

As described above, the condenser lens 10 is directly formed on the inner surface of the front substrate 2 having a single-layer structure, and as shown in FIG. 3, first, the condenser lens 10 is formed on one glass substrate. The same effect can be obtained by forming the inner layer 2b to form the inner layer 2b and connecting it to the glass substrate as the outer layer 2a to form the front substrate 2 having a two-layer structure. In this case, the outer layer 2a and the inner layer 2b may have the same or different refractive indexes, and as described above, the same material may be used or different materials may be used.

The phosphor layer 11 is a monochromatic light emission display when each condensing lens 10 is coated with the same material having a desired emission color.
A color display can be obtained by forming the phosphor layers 11 having the emission colors of red, green, and blue on the adjacent condenser lenses 10, respectively.

[Advantages of the Invention] As described in detail above, the gas discharge fluorescent display panel of the present invention is provided with a convex condenser lens facing the discharge cell on the inner surface of the front substrate corresponding to the discharge cell. Since the fluorescent material layer is formed on the surface in a curved shape, the light from the fluorescent material layer is condensed and enters the front substrate, and there is almost no loss inside the substrate, resulting in a bright display. To be Moreover,
The reflected light from the fluorescent material layer due to external light is reflected in all directions by the curved fluorescent material layer and diffused inside the front substrate, so the amount of reflected light that is superimposed on the light emitted from the fluorescent material layer. Is small, and a clear display contrast can be obtained.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, FIG. 1 is a cutaway exploded perspective view, FIG. 2 is a cross-sectional view, and FIG. 3 is a cross-sectional view showing a constitutional example of a front substrate. 1 ... Gas discharge fluorescent display panel, 2 ... Front substrate, 2a ...
... outer layer, 2b ... inner layer, 3 ... rear substrate, 4 ... airtight envelope, 5 ... cathode, 6 ... anode, 9 ... discharge cell, 10
...... Condensing lens, 11 …… Fluorescent material layer.

Claims (7)

[Scope of utility model registration request] 1. A front substrate having a light transmitting portion and a rear substrate are opposed to each other at a predetermined interval to form an airtight envelope, and a plurality of cathodes and anodes are opposed to each other with a discharge gap therebetween. A discharge gas is enclosed in an airtight envelope together with a discharge gas to form a discharge cell at a portion where the cathode and the anode face each other. Further, a portion corresponding to each discharge cell on the inner surface of the front substrate is directed toward the discharge cell side. A gas discharge fluorescent display panel, characterized in that each of the convex condenser lenses is provided and a fluorescent material layer is formed on the curved surface of the condenser lens. 2. The gas discharge fluorescent display panel according to claim 1, wherein the front substrate has a single-layer structure. 3. The utility model registration claim 1, wherein the front substrate has a two-layer structure of an outer layer and an inner layer, and a condenser lens is formed on the inner layer. Gas discharge fluorescent display panel. 4. An outer layer and an inner layer constituting the front substrate,
The gas discharge fluorescent display panel according to claim 3, characterized in that it is made of a substance having the same refractive index. 5. An outer layer and an inner layer constituting the front substrate,
The gas discharge fluorescent display panel according to claim 3, characterized in that it is made of substances having different refractive indexes. 6. A gas discharge fluorescent display panel according to any one of claims 1 to 5, characterized in that the fluorescent color of the phosphor layer is monochromatic. 7. The utility model registration claim according to any one of claims 1 to 5, characterized in that the luminescent colors of the phosphor layer are red, green and blue, and the colors are alternately arranged. A gas discharge fluorescent display panel described in 1.