JPH0721928A - Gas discharge type display device - Google Patents

Abstract

PURPOSE:To improve the quality of a screen and to achieve long life by forming a sealed gas primarily of He, Ne and Xe, and by using a blended gas in which the partial pressure of each gas exceeds 5% in relation to the whole sealed gas. CONSTITUTION:When a blended gas (A) (He 0%, Ne 85%, Xe 15%) is used as a sealed gas in a gas discharge type display device, discharging is expanded to only the two thirds of a discharge cell 9 along a negative electrode 2 with an opening 8a as a center. When a blended gas B (He 40%, Ne 40%, Xe 20%) is used as the sealed gas, the expansion 11 of discharging is throughout the entire surface of the cell 9. When a blended gas C (He 95%, Ne 0%, Xe 5%) is used as the sealed gas, the expansion 11 of discharging is the same as the case where the blended gas B is used, and is almost throughout the entire surface of the discharge cell 9. When the blended gas B or C is used, the screen quality is improved.

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 which has improved brightness and display uniformity.

[0002]

2. Description of the Related Art Conventionally, a gas discharge display device has been used as a flat display device in information terminal equipment such as a portable computer, and its field of application has been expanded due to its clear display and wide viewing angle. In recent years, with the increase in size of television receivers, attention has been focused on a gas discharge display device that can significantly reduce the depth in place of a cathode ray tube.
Improvements in brightness and life are desired.

A conventional gas discharge display device will be described below. FIG. 4 is a partially cutaway perspective view of a general gas discharge display device. In FIG. 4, 1 is a first glass plate, 2 is a cathode wire formed on the first glass plate 1, 3 is a second glass plate, 4 is an anode wire formed on the second glass plate 3, 5 Is an auxiliary anode, 6 is a partition wall, 7 is a phosphor, 8 is an overcoat, 8a is an opening of the overcoat 8, 9 is a display cell, and 10 is an auxiliary cell.

As shown in FIG. 4, in a general gas discharge type display device, a partition wall 6 is formed by a first glass plate 1 having a cathode line 2 formed thereon and a second glass plate 3 having an anode line 4 formed thereon. Is used as a spacer, the cathode line 2 and the anode line 4 are opposed to each other at a right angle, and the discharge cell 9 is formed at the intersection thereof.
Further, an overcoat 8 having an opening 8a is formed immediately above the anode wire 4 and the opening 8a is formed.
The phosphor 7 is applied to surround the. The first glass plate 1 and the second glass plate 3 are separated by a partition wall 6 at regular intervals, and the peripheral portion is sealed with frit glass.
Gas is enclosed inside.

In the gas discharge type display device shown in FIG. 4, the gas enclosed therein emits ultraviolet rays by gas discharge,
The ultraviolet rays cause the phosphor 7 to emit light. In such a gas discharge type display device, color display can be performed by applying phosphors 7 that emit red, green and blue light, for example.

In the conventional gas discharge display device, a helium (He) -xenon (Xe) mixed gas is used as a discharge gas.
A neon (Ne) -xenon (Xe) mixed gas or a mixed gas obtained by mixing these systems with a small amount of krypton (Kr) or argon (Ar) is used.

[0007]

However, in the above conventional structure, when a helium-xenon-based mixed gas is used, the discharge spreads over the entire discharge cell, so that the image quality is good but the life is short, and the neon-xenon-based mixed gas is used. When it is used, it has a long life but has a problem that the discharge does not spread to the entire discharge cell and the image quality is deteriorated.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a gas discharge type display device capable of achieving a long life without deteriorating the image quality.

[0009]

In order to achieve this object, the gas discharge type display device of the present invention comprises helium, neon and xenon as the main gas as a filling gas, and the partial pressure of each of these gases is completely filled. It has a configuration using a mixed gas of more than 5% with respect to the gas pressure.

[0010]

With this structure, discharge is likely to occur and more ultraviolet rays that excite the phosphor are emitted.

That is, generally, the phosphor used in the gas discharge type display device is excited by ultraviolet rays. In this case, the wavelength of the ultraviolet light emitted from xenon substantially matches the absorption band of the phosphor, but it is difficult to discharge it only with xenon. In the gas discharge display device of the present invention, the xenon is mixed with helium to facilitate the discharge, and the mixed gas is mixed with neon to prolong the life.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In the gas discharge display device of the present invention,
Except for the enclosed gas, the structure is the same as the general gas discharge type display device shown in FIG. 4 and its explanation is omitted. Figure 4
Shows an example in which a discharge current limiting element is not connected to each discharge cell, but a discharge current limiting element such as a resistor may be connected to each discharge cell.

FIG. 1 is a diagram showing the relationship between the type of enclosed gas and the brightness of a gas discharge display device. In FIG. 1, mixed gas A is He (0%)-Ne (85%)-Xe (15%), and mixed gas B is He (0%)-Ne (85%)-Xe (15%).
(40%)-Ne (40%)-Xe (20%), mixed gas C is He (95%)-Ne (0
%)-Xe (5%), respectively, and the mixed gas B is a combination in one embodiment of the present invention. The data in FIG. 1 is obtained by enclosing the mixed gas at a gas pressure of 250 Torr and measuring the luminance at a discharge current of 1 mA. As a result, assuming that the brightness when the mixed gas B is enclosed is 1, the brightness of the mixed gas A is as low as 0.72, and the brightness of the mixed gas C is 0.89. The brightness was highest when the mixed gas B was used.

FIG. 1 shows luminance measured by changing the composition of the discharge gas under the same gas pressure and discharge current. Therefore, there is a difference in luminance in FIG. 1 as a result of changing the composition of the discharge gas, and as a result, the luminous efficiency of the discharge gas (luminance / input power)
This is probably because the input power (discharge current x discharge voltage) has changed.

2 (a) to 2 (c) are diagrams schematically showing the relationship between the type of the enclosed gas and the spread of the discharge in the gas discharge type display device, and FIG. 2 (a) uses the mixed gas A. 2B shows the case where the mixed gas B is used, and FIG. 2C shows the case where the mixed gas C is used. In these drawings, 2 is a cathode line, 4 is an anode line, 6 is a partition wall, 8a is an opening of an overcoat (not shown), 9 is a discharge cell surrounded by the partition wall 6, and 11 is a spread of discharge. Figure 2
The discharge spread in (a) to (c) is such that the lateral distance W ₁ of the partition wall 6 is 1400 μm and the width W _{2 of the} anode wire 4 is 40.
This is an observation of a gas discharge type display device in which the distance L _{1 in} the vertical direction of the partition wall 6 is 1650 μm, the width L ₂ of the cathode line ₂ is 250 μm, and the distance between the cathode line 2 and the anode line 4 is 140 μm.

First, when a mixed gas A (He (0%)-Ne (85%)-Xe (15%)) is used as the enclosed gas shown in FIG. 2 (a), the opening 8a is centered along the cathode 2. As a result, the discharge spread 11 is only about 2/3 of the discharge cell 9. Next, a mixed gas B containing He (He (40%)-Ne (40%)-Xe (20%)), which is a combination of one embodiment of the present invention, is used as the filling gas shown in FIG. 2 (b). If it is, the discharge spreads across the entire surface of the discharge cell 9 11
There is. Next, as a filling gas shown in FIG.
Of mixed gas C (He (95%)-Ne (0
%)-Xe (5%)), discharge spread 11
As in (b), it spreads over almost the entire surface of the discharge cell 9. Therefore, when the mixed gas B or the mixed gas C is used, the image quality is improved as compared with the case where the mixed gas A is used.

Generally, the wider the discharge spread 11 is, the more advantageous the brightness is. That is, since the ultraviolet light that excites the phosphor undergoes self-absorption by the discharge gas, if the discharge current is the same, the discharged ultraviolet light has a higher utilization efficiency of the emitted ultraviolet light.

FIG. 3 is a diagram showing the relationship between the type of enclosed gas and the life of the gas discharge type display device. In FIG. 3, mixed gases A, B and C are the same mixed gas as in FIG.
In addition, the life is expressed by the time until the brightness is reduced to half when continuously lit. As shown in FIG. 3, when the Ne-Xe mixed gas A is used, the life is longest, and when the life is 1, the mixed gas B containing He, which is a combination of the embodiments of the present invention, is used. In the case of 0.17, the mixed gas C containing no Ne has a shorter life of 0.007.

From the above results, in the case of using the mixed gas B (He (40%)-Ne (40%)-Xe (20%)), which is the combination of the present embodiment, as shown in FIG. 2 is inferior to the mixed gas A containing no He, but is superior in the spread of discharge shown in FIG. 2 and the luminance shown in FIG. 1, and in the mixed gas A, the red emission of Ne is strong, so that the color purity is deteriorated. Considering
It can be said that it is the most practically superior overall.

In this embodiment, the gas composition of the present invention was used for the direct-current gas discharge type display device to improve the image quality and prolong the service life. It goes without saying that the same effect can be obtained by applying it to the device.

[0021]

As described above, according to the present invention, a mixed gas containing helium, neon and xenon as the main components as the filling gas, and the partial pressure of each of these gases exceeding 5% of the total filling gas pressure is used. The basic gas is xenon, which emits ultraviolet rays to excite the phosphor, and the addition of helium lowers the discharge start voltage to facilitate discharge, and the addition of neon lowers the discharge sustaining voltage to extend the life. Thus, it is possible to realize an excellent gas discharge type display device that has been realized.

[Brief description of drawings]

FIG. 1 is a diagram showing the relationship between the type of enclosed gas and the brightness of a gas discharge display device.

2 (a) to 2 (c) are diagrams schematically showing the relationship between the type of gas enclosed in a gas discharge display device and the spread of discharge.

FIG. 3 is a diagram showing the relationship between the type of enclosed gas and the life of the gas discharge display device.

FIG. 4 is a partially cutaway perspective view of a general gas discharge display device.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Yoshihiro Kubo 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electronics Industrial Co., Ltd. (72) Koichi Wazube, 1006 Kadoma, Kadoma City, Osaka Matsushita Electronics Industrial Co., Ltd. (72) Inventor Shinji Koike 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electronics Industrial Co., Ltd. (72) Tetsuo Sakai 1-10-11 Kinuta, Setagaya-ku, Tokyo Inside the Japan Broadcasting Corporation Broadcasting Technology Laboratory (72) Inventor Yukio Murakami 1-10-11 Kinuta, Setagaya-ku, Tokyo, Japan Broadcasting Technology Laboratory (72) Inventor Yasushi Motoyama 1-1-10 Kinuta, Setagaya-ku, Tokyo Japan Broadcasting Technology Laboratory ( 72) Inventor Mizuho Gozawa 1-10-11 Kinuta, Setagaya-ku, Tokyo Inside the Japan Broadcasting Corporation Broadcasting Technology Laboratory

Claims (3)

[Claims] 1. A first substrate having a group of first electrode lines, a second substrate having a group of second electrode lines, an electrode body connected to the second electrode lines, and a phosphor. Are opposed to each other by a partition wall to form a discharge cell, and a mixed gas containing helium, neon and xenon as a main component as a main gas and having a partial pressure of each gas of more than 5% with respect to the total pressure of the full gas. The gas discharge type display device used. 2. The gas discharge display device according to claim 1, wherein the discharge is a direct current discharge. 3. The gas discharge type display device according to claim 2, wherein the second electrode wire and the electrode body are connected via a discharge current limiting element.