JP2616538B2 - Gas discharge display - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas discharge type display device, and more particularly to a gas discharge type display device used for a display of an information terminal device or a personal computer, or an image display device of a television.

[0002]

2. Description of the Related Art In a gas discharge type display device which performs color display by disposing a phosphor layer which emits light when excited by ultraviolet light,
In order to display an image with high light emission luminance, high light emission efficiency, and excellent color reproducibility, it is important to set the gas composition to be sealed in the gas discharge space suitable for the discharge type used.

As a structure of a gas discharge type display device which realizes color display by disposing a phosphor layer which emits light by ultraviolet excitation, a surface discharge type gas discharge type display device shown in FIG. 1 is promising. In this gas discharge type display device, a second insulating substrate 2 having a surface discharge electrode 3 composed of a scanning electrode and a sustain electrode and a first insulating substrate 1 having a data electrode 4 are bonded together with an insulating partition wall 6 interposed therebetween. A discharge gas is sealed in a discharge gas space 5 formed between the first and second substrates 1 and 2. The surface discharge electrode 3 is covered with a protective film 9 made of MgO having excellent sputter resistance and a high secondary electron emission coefficient. The gas discharge type display device having such a structure,
Among the flat displays, they are suitable for large-area displays because of their features such as large capacity, fast response speed, and memory characteristics that simplify the drive circuit. In the surface discharge type gas discharge display device, helium (hereinafter, He) is used as a discharge gas sealed in the discharge gas space 5.
) -Xenon (hereinafter referred to as Xe) or a binary gas mixture of neon (hereinafter referred to as Ne) -Xe is widely used.

[0004]

Normally, in a surface discharge type display device, a protective film made of MgO protecting the surface of a surface discharge electrode is coated with Xe accelerated by an electric field in a discharge gas space. When the ions collide, an MgO film having a high secondary electron emission coefficient is sputtered. The disappearance of the MgO film causes an increase in the driving voltage, and a sputtered substance adheres to the phosphor layer to lower the luminance. In order to prevent sputtering of the MgO film and obtain stable driving for a long period of time, it is effective to reduce the acceleration of Xe ions. For this reason, the total pressure of the discharge gas is set to a considerably high pressure of 350 to 500 Torr. Must. However, with a He—Xe mixed gas generally widely used in a discharge display device for color display, the drive voltage increases at such a high pressure. Xe mixed with discharge gas to obtain high emission brightness
Although the method of increasing the amount may be adopted, the drive voltage is further increased with the increase of Xe, so that a driving circuit with a high withstand voltage is required and driving becomes difficult.

On the other hand, Ne- containing the same amount of Xe
The Xe mixed gas can be driven at a low voltage, and the sputtering of MgO by Xe ions is also reduced. However, there is a problem that it is inferior to the color reproducibility due to the color mixture of the visible light emission of Ne and the visible light emission from the phosphor layer and the high-speed operation required for image display.

[0006] As one of the methods for reducing the driving voltage of the He-Xe mixed gas, a method of mixing a very small amount of Ne to 1% or less is disclosed in Procedure Digs.
Of the SII Day (Proceedings
of the SID), Vol. 31/1 (p.
p. 41-45) and G. Woolat (J.
R. Wullert, et al., High-Speed Memory and Gas Mixture Optimization in Suspended Electrode Color Plasma Display (High-Speed Mem)
ory and Gas-Mixture Optim
Ization in Suspended-Elect
trade Color Plasma Displa
As described in the article entitled y), when the mixing ratio of Ne is set to 1% or more, the visible light emission of Ne is remarkably affected, and the color purity is reduced. Has a problem.

An object of the present invention is to realize a gas discharge type display device in which the driving voltage is lowered while maintaining the memory margin required for driving, the light emission from the discharge gas is weak, and the luminous efficiency is higher than before. Is to do.

[0008]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a new discharge gas composition for improving the luminous brightness and luminous efficiency of a gas discharge type display device. Discharge gas to be filled in a gas discharge type display device provided with a phosphor layer is 1.5 to 10% by volume of Xe.
He and Ne of the He—Ne mixed gas at this time as a ternary mixed gas composed of He and Ne mixed gas.
Is a three-component mixed gas mixed at a volume ratio of 6: 4 to 9: 1.

[0009]

In the present invention, of the three-component mixed gas described above, Ne is 10% by volume with respect to He contained in the discharge gas.
By mixing as described above, a drastic reduction in driving voltage and improvement in luminous efficiency were achieved. Further, by mixing 1.5 to 10% by volume of Xe, visible light emission from Ne was weakened, and a display drive excellent in color reproducibility could be obtained.

FIGS. 2 and 3 show a graph of 4 with respect to the total amount of discharge gas.
FIG. 5 is a characteristic diagram showing changes in a discharge starting voltage, a minimum sustaining voltage, and a luminous efficiency with respect to a mixture ratio of He and Ne of a ternary mixed gas containing Xe of volume%. From FIG. 2, it can be seen that the operating voltage increases as the He mixing ratio increases, but the rate of increase becomes steeper when the He mixing ratio is 90% or more. Therefore,
It has been found that in order to significantly lower the operating voltage of the He-Xe mixed gas, it is preferable to mix Ne by 10% by volume or more with He. The memory margin at this time is
It can be seen that a sufficient value is maintained as shown in FIG. Although not simply expected, as shown in FIG. 3, the luminous efficiency shows a higher value than the two-component gas containing each gas as a base, and the He—Ne mixture ratio is 7: 3. It turned out to be the largest. When the luminous efficiency is high, heat generated by light emission of the gas discharge type display device can be reduced even when display is performed with high luminance. In addition, when display is performed at the same luminance, display can be performed with less power as the luminous efficiency is higher, so that the load on the drive circuit is reduced and a highly reliable gas discharge display device can be obtained. . It is also advantageous in that it can contribute to power saving.

When this three-component mixed gas is used, since the amount of Xe is as large as 1.5 to 10% by volume, the visible light of Ne becomes weak. At this time, the operating voltage is increased by increasing the Xe mixture ratio. However, in this range, the operating voltage due to mixing of 10% or more of Ne by volume ratio with He contained in the above-described discharge gas is reduced. Since the effect of the reduction is large, the operating voltage can be kept low. When this three-component mixed gas was compared with a He-Xe mixed gas showing the same operating voltage, high luminous efficiency and high luminance were obtained. Further, not only better color reproducibility than Ne-Xe showing the same operating voltage was obtained, but also high luminous efficiency was obtained.

FIG. 4 is a characteristic diagram showing the Xe mixing ratio dependency of the ratio of the visible light emission luminance component from the discharge gas to the excitation light emission luminance of the phosphor layer when the volume ratio of He and Ne is 7: 3. . From FIG. 4, when the Xe content is less than 1.5% by volume with respect to the total gas content, strong visible light emission due to the mixing of Ne is exhibited. Therefore, the Xe content is preferably 1.5% by volume or more.
Further, it is understood that when the Xe content is less than 1.5% by volume, sufficient luminance cannot be obtained.

Further, Ne is 40% by volume relative to He.
In the case of the above mixing, in order to suppress the visible light emission of Ne and obtain good color reproducibility, it was necessary to mix the Xe amount of 10% by volume or more based on the total gas amount of the discharge gas. However, the operating voltage at this time was high, and driving was difficult. Therefore, the amount of Xe is 1.5 to
A remarkable effect was found in the range of 10% by volume.
Significant effects were found in the volume ratio of e to Ne in the range of 6: 4 to 9: 1. Further, within this range, the high-speed operation characteristics affecting the data writing / erasing characteristics required for displaying an image were also good.

[0014]

Next, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a structural sectional view showing the structure of a surface discharge type gas discharge type display device of the present invention. In FIG. 1, 1
Is a first insulating substrate made of 2 mm thick soda glass, 2 is a second insulating substrate also made of 2 mm thick soda glass,
3 is a surface discharge electrode composed of a scan electrode and a sustain electrode made of an Al thin film having a thickness of 2 μm, 4 is a data electrode also composed of a transparent Nesa electrode, 5 is a discharge gas space filled with a discharge gas, and 6 is a first insulating material. It is an insulator partition sandwiched between the substrate 1 and the second insulating substrate 2 and separating between display cells. 7
Is a phosphor layer made of Zn ₂ SiO ₄ : Mn that emits light by ultraviolet light generated by discharge of a discharge gas, 8 is an insulator made of a thick transparent glaze covering an electrode, and 9 is an insulator protected from gas discharge. It is a protective film of MgO having a thickness of 2 μm. The configuration of the surface discharge type gas discharge display device applied to the present embodiment is the same as the configuration of the conventional gas discharge display device, and only the components of the discharge gas are different.

The gas discharge type display device shown in FIG.
Xe mixed gas (Xe 4% by volume, total pressure 500 Torr)
Was enclosed. FIG. 2 shows a gas discharge display device in which the three-component mixed gas having a He mixing ratio of 70% by volume is sealed and a gas discharge display device in which a He—Xe mixed gas containing Xe at the same volume% and having a total pressure of 500 Torr is sealed. As already shown in FIGS. 3 and 3, the gas discharge display device of the three-component mixed gas of the present embodiment reduced the discharge starting voltage by 30 V and increased the luminous efficiency by 1.25 times, showing a great improvement. The same applies to those coated with another phosphor that emits red-blue light.

In the above embodiments, the effectiveness of the surface discharge type gas discharge type display device has been described as an example.
The present invention is also directed to a gas discharge type display device using various methods of performing color display by disposing a phosphor layer which emits light by ultraviolet excitation by discharge in a discharge gas space in that high luminous efficiency is obtained. It is valid.

[0018]

As apparent from the above description, according to the present invention, 1.5 to 10% by volume of Xe and He-Ne
As a three-component mixed gas composed of a mixed gas, the drive voltage can be suppressed by setting the volume ratio of He to Ne of the He—Ne mixed gas at this time to a ratio of 6: 4 to 9: 1. Since a driving circuit with a high withstand voltage becomes unnecessary, the use of this discharge gas not only facilitates driving, but also has a high luminous luminance and luminous efficiency, and a low luminous luminance from the discharge gas, thereby displaying an image. Since a high-speed operation that affects the data writing / erasing characteristics required at that time can be performed, there is an effect that a gas discharge display device that performs color display with good display quality can be provided.

[Brief description of the drawings]

FIG. 1 is a structural sectional view showing a configuration of a surface discharge type gas discharge type display device of the present invention.

FIG. 2 shows 3 containing 4% by volume of Xe with respect to the total pressure of the discharge gas
FIG. 4 is a characteristic diagram showing a change in operating voltage depending on a mixture ratio of He and Ne of a component mixed gas.

FIG. 3 contains 4% by volume of Xe with respect to the total pressure of the discharge gas
FIG. 4 is a characteristic diagram showing a change in luminous efficiency depending on a mixing ratio of He and Ne of a component mixed gas.

FIG. 4 is a characteristic diagram showing the Xe mixing ratio dependency of the ratio of the visible light emission luminance component from the discharge gas to the excitation light emission luminance of the phosphor when the volume ratio of He and Ne is 7: 3.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 first insulating substrate 2 second insulating substrate 3 surface discharge electrode 4 data electrode 5 discharge gas space 6 insulator partition wall 7 fluorescent layer 8 insulator 9 protective film

Claims (1)

(57) [Claims] At least one pair of electrodes for forming a discharge is formed inside at least one of a pair of substrates constituting a gas discharge space, and an ultraviolet ray is formed on a part of an inner surface of the gas discharge space. In a gas discharge type display device in which a phosphor layer which emits light by excitation is arranged to perform color display, a helium-neon mixture of helium and neon in the gas discharge space at a volume ratio of 6: 4 to 9: 1. A three-component mixed gas composed of a mixed gas and xenon is sealed,
The xenon is 1.5 to 10% by volume based on the total gas amount.
A gas discharge type display device characterized by being mixed at a ratio .