JPH0638362Y2 - 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, which are opposed to each other with a discharge gap 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 Problem] A gas discharge fluorescent display panel according to the present invention for solving the above-mentioned problems is 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. And 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 a discharge cell in a portion where the cathode and the anode are opposed to each other. In a gas discharge fluorescent display panel, on at least one surface of the transparent substrate,
A condenser lens plate having a condenser lens formed of a convex lens corresponding to each discharge cell is disposed between the discharge cell and the front substrate, and at least the condenser lens on the discharge cell side of the condenser lens plate. It is characterized in that a fluorescent material layer is formed on the portion.

[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. In addition, external light that has entered the front substrate from the outside at a certain angle is reflected by the phosphor layer, and the angle changes due to the refraction by the condenser lens and is scattered to a considerable part inside the front substrate and the condenser lens plate. Diffused.

[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. A discharge cell 7 is formed by enclosing it in an envelope 4 at a portion where the cathode 5 and the anode 6 face each other, and a condenser lens plate 8 is arranged between the discharge cell 7 and the front substrate 2.

The plurality of anodes 6 are placed in parallel on the back substrate 3, and the anode 5 is placed thereon via the back spacer 9 having the matrix-shaped through holes 9a.
A front spacer 10 having through holes 10a formed in a matrix is interposed between the condenser lens plate 8 and the condenser lens plate 8.

Further, a light-shielding mask 11 made of black glass is applied to the inner surface of the front substrate 2 except for the through holes 2a in the portions corresponding to the discharge cells 7 to prevent the display spots formed on the front substrate 2 from being exposed. The outline is sharp.

The condenser lens plate 8 which is a feature of the present invention has a thickness of 0.2 to 0.4.
The transparent substrate 12 made of thin glass of about mm has a condenser lens 13 formed of a convex lens on the surface on the upper surface side corresponding to the discharge cell 7, and the surface on the lower surface side, that is, the discharge A phosphor layer 14 is formed on the surface facing the cell 7. As described above, the condensing lens 13 is composed of a convex lens formed on one surface of the condensing lens plate 8, and also on both surfaces of the condensing lens plate 8 as shown in FIG. 3 (A). A structure in which convex lenses 13a and 13b having the same focal length are formed, and FIG.
As shown in, convex lenses 13a and 13b with different focal lengths
The same effect can be obtained even if it is configured by.

To form the condensing lens plate 8, a resist is applied to a portion of the transparent substrate 12 corresponding to the discharge cell 7 and is chemically etched with hydrofluoric acid or the like, and the isotropic nature of the etching action is used. Converging lens 13 by overetching
Or a method of forming a condenser lens 13 by applying a low melting point glass to a portion of the transparent substrate 12 corresponding to the discharge cell 7, heating and melting the glass, and utilizing the surface tension of the glass. The substrate 12 is held in a carbon mold provided with a depression in a portion corresponding to the portion where the condenser lens 13 of the transparent substrate 12 is to be formed, and is heated and embossed at a temperature equal to or higher than the softening point of the substrate 12. There are ways.

The fluorescent body layer 14 may be formed only on the condenser lens 13 portions. In this case, if the same material having a desired emission color is applied to each condenser lens 13 portion, a monochromatic light emission display is obtained. Obtained,
A color display can be obtained by forming the phosphor layers 14 respectively having red, green and blue emission colors on the adjacent condensing lens 13 portions.

[Effects of the Invention] As described in detail above, the gas discharge fluorescent display panel of the present invention is
A condenser lens plate, in which a condenser lens composed of a convex lens corresponding to each discharge cell is formed on at least one surface of the transparent substrate, is disposed between the discharge cell and the front substrate, and the condenser lens plate is further provided. Since the fluorescent material layer is formed at least on the condenser lens part on the discharge cell side, the light from the fluorescent material layer is condensed and incident on the front substrate, and there is almost no loss inside the substrate. Therefore, a bright display can be obtained. Moreover, the reflected light of the fluorescent layer due to external light is scattered by the refraction of the condenser lens and diffused into the inside of the front substrate and the condenser lens plate, so that the light emitted from the fluorescent layer is superimposed on the reflected light. The amount of light becomes 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 an exploded perspective view of a notch, FIG. 2 is a sectional view, and FIG. 3 is a sectional view showing a constitutional example of a condenser lens. 1 ... Gas discharge fluorescent display panel, 2 ... Front substrate, 2a ...
… Translucent part, 3 …… Rear substrate, 4 …… Airtight envelope, 5 ……
Cathode, 6 ... Anode, 7 ... Discharge cell, 8 ... Focusing lens plate, 12 ... Transparent substrate, 13 ... Focusing lens, 14 ... Fluorescent material layer.

Claims (6)

[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. In a gas discharge fluorescent display panel in which a discharge cell is enclosed in an airtight envelope together with a discharge gas, and a discharge cell is formed at a portion where the cathode and the anode face each other, at least one surface of a transparent substrate is provided with each discharge cell. A condenser lens plate formed with a condenser lens composed of a convex lens corresponding to is disposed between the discharge cell and the front substrate, and further, at least the condenser lens portion on the discharge cell side of the condenser lens plate is fluorescent. A gas discharge fluorescent display panel having a body layer. 2. A gas discharge fluorescent display panel according to claim 1, wherein the condenser lenses are formed on both surfaces of the condenser lens plate, respectively. 3. The gas discharge fluorescent display panel according to claim 2, wherein the focal lengths of the condenser lenses formed on both surfaces of the condenser lens plate are equal to each other. . 4. The gas discharge fluorescent display panel according to claim 2, wherein the focal lengths of the condenser lenses formed on both surfaces of the condenser lens plate are different from each other. . 5. The gas discharge fluorescent display panel according to any one of claims 1 to 4, wherein the emission color of the phosphor layer is monochromatic. 6. A utility model registration claim according to any one of claims 1 to 4, characterized in that the phosphor layers emit red, green and blue colors, and the colors are alternately arranged. The gas discharge fluorescent display panel described in.