JPS596467B2 - Gas discharge display device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a gas discharge type display device, and particularly to the shape of a discharge hole thereof.

As shown in FIG. 1aXb, a typical structure of a gas discharge type display device that has been reported so far is that a display anode group 3 and a display anode group 3 are disposed perpendicularly to the upper and lower surfaces of a rectangular cathode group 2, as shown in FIG. 1aXb. A scanning anode group 4 is arranged, each electrode is insulated by a cell sheet 5 as a partition plate made of glass or ceramic, and a back plate 6, and the whole is sealed in a sandwich shape using a transparent front panel 7. Fixed.

Cylindrical discharge holes 8 are provided in the cell sheet 5, and small auxiliary discharge holes 1 are provided in the cathode 2 at positions perpendicular to the electrodes.

In order to display in color, the phosphor 10 is coated on the peripheral wall of the discharge hole 8, or is coated in dots on the inner surface of the front panel 7 at a position corresponding to the discharge hole 8.

The periphery of each electrode and insulating plate is hermetically sealed and fixed with adhesive, and rare gases such as neon, argon, helium, and xenon and mercury are sealed inside at several hundred torr. .

The device operates by performing a scanning discharge (auxiliary discharge) along a groove 9 provided on the back plate 6, and in response to a display signal synchronized with this, the discharge on the scanning side passes through the auxiliary discharge hole 1 and enters the display discharge hole 8. This is achieved by drawing out.

By the way, the biggest problem with color display using the gas discharge type display device mentioned above is that the luminance and efficiency are low, and it is believed that the cause of this is the low efficiency of generating ultraviolet radiation itself. I can say that.

Therefore, as one solution to this problem, attempts have been made to utilize ultraviolet radiation due to discharge in the positive column region, and these methods can be roughly classified into the following two types.

(1) Vertical solar type As shown in Figure 2a, the length t in the axial direction of a cylindrical discharge cell perpendicular to the panel surface is made long to the solar column area.
It utilizes light emitted from a positive column emitted in the longitudinal direction of the discharge hole 8, and the phosphor 10 is applied to the peripheral wall of the discharge hole 8 and the inner surface of the front panel 7.

(2) Horizontal positive column type As shown in Figure 2, a positive column is formed in the discharge hole 8 parallel to the panel surface, and the light emitted from the horizontal direction of the positive column is utilized. It is applied to the peripheral wall of the hole 8 and the inner surface of the front panel 7.

All of these are designed to increase luminous efficiency by emitting effective ultraviolet rays, increasing the area coated with the phosphor, and effectively utilizing the phosphor emission in a reflective format.
1), (2) As a result of prototyping a panel with discharge holes 8 in the picture form, the vertical type (L = 2.Orrrm) was 5 to 6 times as efficient as the conventional negative glow type, and the horizontal type (t = 3.5 rrvn), it was possible to obtain approximately 20 times the luminous efficiency.

However, in the case of the vertical positive column type, the light emitted by 1 g of phosphor coated on the peripheral wall of the discharge hole 80 is difficult to observe from the front of the panel.Compared to the horizontal positive column type, the utilization rate of the phosphor emission is lower. is low.

On the other hand, in the horizontal solar column type, the phosphor 10 is applied almost parallel to the panel surface, so it can be seen directly from the front of the panel, and the thickness of the phosphor 10 on the front panel 7 can be adjusted appropriately. This makes it possible to effectively utilize reflection-type and transmission-type phosphor emission.

Therefore, as a result of conducting an experimental study on the relationship between the width W and length t of the horizontal positive column type discharge hole 8 and its luminous efficiency, the characteristics shown in FIG. 3 were obtained.

In this experiment, Zn2SiO4:Mn was used as the phosphor, Ar gas was used at 100 Torr, and the temperature was 100°C.

That is, (1) the luminous efficiency hardly changes depending on the width W of the discharge hole 80;

(2) A significant correlation is observed between the discharge hole length t and the luminous efficiency, and the luminous efficiency increases as t increases.

From the above results, it was found that the horizontal positive column type discharge hole is superior in brightness compared to the conventional one, and the longer and narrower the hole, the greater the effect.

However, in such a horizontal positive column type discharge cell, as the distance between the electrodes increases, the display area occupied by the discharge holes 8 increases, resulting in a new problem that the resolution decreases when displaying an image.

An object of the present invention is to prevent the problematic resolution from decreasing while taking advantage of the high luminous efficiency of the horizontal positive column type discharge hole.

The present invention provides a three-dimensional discharge path with a hairpin-shaped folded structure within a cell sheet, thereby making the length of the discharge path sufficiently long without increasing the display area for each discharge hole, thereby increasing luminous efficiency. is planned.

Note that the self-scanning function using auxiliary discharge as described above is not necessarily essential to the present invention, and the effect will not change even if the panel structure is omitted.

The present invention will be described in detail below based on the drawings.

FIG. 4 is a diagram showing a typical example of the discharge hole structure according to the present invention.

In the figure, one hairpin-shaped fold is provided in a plane perpendicular to the panel, and the display area occupied by each discharge hole remains unchanged, but the discharge path length is doubled, resulting in effective ultraviolet radiation,
The luminous efficiency is increased by increasing the area coated with the phosphor.

In FIG. 4, the intermediate cell sheet 11 is made of a transparent material, and the luminous efficiency can be increased by effectively utilizing the light emitted by the phosphor 120 coated under it in a transmission format.

At this time, the light emitted by the phosphor 120 applied to the lower part of the intermediate cell sheet 11 is attenuated to some extent by the time it reaches the front surface of the panel 7, but the potential gradient in the positive column region is generally extremely low, and the length of the positive column is Since the increase in input due to the increase is extremely small, an increase in luminous efficiency can be obtained.

In the embodiment shown in FIG. 4, the display area when the positive column length is 2.2M by folding is the same as when 7=1.1rrrIn is used in the conventional cell structure shown in FIG. As a result of experimental studies, as shown in Fig. 5, the luminous efficiency of the embodiment shown in Fig. 4 was 1.51 compared to the conventional one.
It has increased by ~1.56 times.

The experiment according to this example was conducted under the same conditions as the experiment shown in FIG.

In addition, in FIG. 5, curve A is based on the structure of FIG.
Curve B shows the case where l=1.1 rrvn and the positive column length is 2.2 rrvn based on the structure of FIG.

Further, in the embodiment shown in FIG. 4, the intermediate cell sheet 11 is made of a material (such as quartz) that easily transmits ultraviolet rays, so that
The emitted ultraviolet light passes through the upper and lower portions of the intermediate cell sheet 11.

Therefore, ultraviolet rays can be used effectively, and an increase in luminous efficiency is expected.

Naturally, it is also effective to coat the phosphor 13 on the peripheral wall of the discharge path portion perpendicular to the panel surface.

Furthermore, although this embodiment has been described with one hairpin-shaped discharge hole, it is also possible to apply a three-dimensional structure in which several hairpin-shaped discharge holes are combined.

As described above, since the gas discharge display device of the present invention has a hairpin-shaped folded structure for the discharge holes, it is possible to: The length of the path can be extended to the area of the positive pillar.

■ Luminous efficiency can be increased by effective ultraviolet radiation and an increase in the phosphor coating area.

- Since the degree of freedom in the shape of the discharge holes increases, it is easy to create creative ideas in terms of shape, such as increasing the contrast by using a blind structure that prevents the auxiliary discharge light from being seen from the display side.

(2) Discharge holes can be easily formed by overlapping several thin cell sheets processed with various patterns by photo-etching, etc., so fine processing is easy.

It has excellent points such as:

As described above, the discharge hole according to the present invention allows the luminous efficiency to be extremely increased by utilizing the discharge in the positive column region without reducing the resolution of the image.

[Brief explanation of drawings]

Figure 1a is an exploded perspective view of a typical conventional gas discharge type display device, and Figure 2a is a cross-sectional view of the main part of the same figure, and Figure 2a is a cross-sectional view of the main part of a vertical positive column type discharge hole. , FIG. 3 is a diagram showing the relationship between the positive column length and luminous efficiency, and FIG. 4 is a diagram showing the discharge holes of the gas discharge type display device of the present invention. Main part sectional view of an example of the shape, No. 5
The figure is a diagram showing a comparison of luminous efficiency between a discharge hole according to the present invention and a discharge hole having a conventional structure. 1... Auxiliary discharge hole, 2... Cathode, 3...
...Display anode, 4...Scanning anode, 5...
... Bulkhead plate, 6... Rear plate, 7...
・Front panel, 8...Discharge hole, 9...
Groove, 10.12,13...Color phosphor, 11
...Intermediate cell sheet.

Claims (1)

[Claims] 1. A first partition plate in which a flat plate having a large number of first conductors in the vertical direction, discharge holes, and a recess formed on the surface with one end continuous with the discharge holes are arranged in a matrix; a transparent cell sheet having discharge holes formed corresponding to the other end of the recess and transmitting ultraviolet rays and visible light;
a second partition plate in which discharge holes are formed corresponding to the recesses and discharge holes of the partition plate, and a flat plate in which a second conductor is provided in the lateral direction corresponding to the discharge holes in the first partition plate. are sequentially stacked, and the discharge holes and recesses of the first barrier rib plate, the discharge holes of the transparent cell sheet, and the discharge holes of the second barrier rib plate cause a vertical direction to the first and second barrier rib plates. A hairpin-shaped discharge path is formed with a peripheral wall coated with a fluorescent material, and the hairpin-shaped discharge path is formed by applying a signal voltage between the first conductor and the second conductor. A gas discharge type display device that emits discharge light inside.