JPH08162071A - Discharge display element and image display device using it - Google Patents

Abstract

PURPOSE: To provide a discharge display element used in a large screen color display device used for display of image or information, which has a wide color reproducing range. CONSTITUTION: A neodymium-contained glass 10 is used for all or a part of a light transmitting surface plate forming the display surface of a discharge display element 1, or the neodymium-contained glass 10 is superposed on a general light transmitting surface plate. In the case of a discharge display element 1 having a plurality of emitting small chambers 6a-6d arranged in the inner-part, the neodymium-contained glass is used only to the surface plate part corresponding to the emitting small chambers 6a-6d having green emitting phosphors 9 applied to the inner wall surfaces, or the neodymium-contained glass may be superposed on only the surface plate part. Thus, the emission spectrum part of phosphor or the line spectrum part of mercury causing a reduction in color purity of the display light is effectively absorbed by the neodymium-contained glass, the color purity of each display light is enhanced, and a display image having a wide color reproducing range can be provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discharge display element such as a display fluorescent lamp used in a large screen color display device used for displaying images and information.

[0002]

2. Description of the Related Art Conventionally, a large-screen display device of this type has a large number of discharge display elements 1 arranged vertically and horizontally as shown in FIG. 13, for example. By individually controlling the blinking state of the display element 1, necessary information such as characters, figures, and images is displayed (see, for example, Japanese Patent Laid-Open No. 5-3020).

The discharge display element 1 emits monochromatic light or multicolored light in a single tube. As shown in FIG. 11, it is located above a cylindrical glass bulb 4 containing a common cathode 2 and an auxiliary electrode 3. , A discharge tube body 5 having a quadrangular cross section which forms a light emitting portion
For example, it is configured to be hermetically sealed by using low melting point glass, and in the discharge tube body 4, four light emitting small chambers 6a, 6b, 6 are formed.
Sections c and 6d are formed. At the other end of the discharge tube body 5, a face plate 20 made of soda glass, which constitutes a display surface, is hermetically sealed by using a low melting point glass or the like.

The light emitting chambers 6a to 6d are arranged such that the discharge paths formed therein are in a direction parallel to the tube axis of the glass bulb 4, that is, in a direction orthogonal to the face plate 10, and the sectional shape of each chamber is the face plate 10. It is composed of two types of taper-shaped portions having different slopes that widen toward.

Discharge holes 8a, 8b, 8 forming a discharge path between the small emission chambers 6a-6d and the common cathode 2 are formed.
c and 8d are provided, and the inner wall surface of each light emitting chamber is
For example, the light emitting chambers 6a and 6c are green, 6b is red, and 6
A phosphor 9 that emits blue light is applied to each d, and an anode 7 that selectively discharges between the common cathode 2 at the end of each light emitting chamber 6a, 6b, 6c, 6d on the face plate side.
a, 7b, 7c, 7d are provided.

Argon and mercury as a starting gas are enclosed in the discharge display element 1, and the phosphor 9 is excited and emitted by the ultraviolet rays of mercury generated by the discharge to perform display. The light emitted in each of the light emitting chambers 6a to 6d is transmitted through the face plate 20 forming the display surface and radiated to the outside, whereby full-color images and information are displayed.

[0007]

In the above-mentioned conventional discharge display device, depending on the phosphor used, the emission color of the phosphor contains a spectrum in the wavelength range which lowers the color purity. Further, since the line spectrum of mercury generated by the discharge also contains spectral components that reduce the color purity, the color purity of each display light color that passes through the face plate and is radiated to the outside becomes poor, and There is a problem that the color reproduction range becomes narrow. Further, in order to prevent this, a method of adding a filter corresponding to each emission color has been conventionally used (see Japanese Patent Application Laid-Open No. 5-3020).
There is a problem that the element structure becomes complicated and the cost increases.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned problems, and it is an object of the present invention to provide a discharge display element having a simple structure, good color purity, and a wide color reproduction range.

[0009]

To achieve the above object, in the present invention, neodymium-containing glass is used for the translucent face plate of the discharge display element, or neodymium-containing glass is used for the translucent face plate. Used in combination such as overlapping.

[0010]

According to the present invention, by using neodymium-containing glass for the translucent face plate itself, or by using neodymium-containing glass in combination with the face plate, the emission spectrum component of the phosphor or the mercury which lowers the color purity can be obtained. The line spectrum component is
It is absorbed by the glass containing neodymium, the color purity of each emission color is improved, and a discharge display element having a wide color reproduction range can be obtained.

[0011]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the structure of a discharge display element according to an embodiment of the present invention. It should be noted that FIG. 7A is a front view, and FIG. 8B is a sectional view taken along line AA. In FIG. 1, the discharge display element 1 emits monochromatic light or multicolored light in a single tube, and has a square cross section forming a light emitting portion above a cylindrical glass bulb 4 having a common cathode 2 and an auxiliary electrode 3 built therein. The discharge tube body 5 is hermetically sealed by using, for example, low melting point glass, and the discharge tube body 5 has four light emitting chambers 6a and 6a.
b, 6c and 6d are sectioned. At the other end (upper end) of the discharge tube body 5, a face plate 10 made of neodymium-containing glass, which constitutes a display surface, is also hermetically sealed using low melting point glass or the like.

The light emitting chambers 6a to 6d are arranged such that the discharge paths formed therein are in a direction parallel to the tube axis of the glass bulb 4, that is, a direction orthogonal to the face plate 10, and the cross-sectional shape of each chamber is the face plate 10. It is composed of two types of taper-shaped portions having different slopes that widen toward. A straight portion is provided on the upper end side of the tapered portion.

Discharge holes 8a, 8b for forming a discharge path with the common cathode 2 are formed at the bottoms of the light emitting chambers 6a to 6d.
8c and 8d are provided respectively, and the light emitting small chamber 6a-
On the inner wall surface of 6d, for example, phosphors 9 that emit green light in the light emitting chambers 6a and 6c, red light in 6b, and blue light in 6d are coated, respectively, and end faces of the light emitting chambers 6a to 6d on the face plate side. The parts are provided with anodes 7a, 7b, 7c, 7d for selectively discharging with the common cathode 2. In addition, the cathode 2, the auxiliary anode 3, and the anodes 7 a to 7 a
Electric power for selectively generating a discharge is supplied to each of d through a lead wire, but since power supply means for generating these discharges may be commonly used, they are illustrated here. Is omitted.

Argon and mercury as a starting gas are enclosed in the discharge display element 1, and mercury generates ultraviolet rays by the discharge, and the ultraviolet rays excite the phosphor 9 to emit light. The light emitted in each of the light emitting chambers 6a to 6d is
The light is transmitted to the outside through the face plate 10 forming the display surface, and full-color images and information are displayed by the transmitted radiation.

FIG. 2 shows the spectral transmittance characteristics of glass containing neodymium. As is clear from the figure, the spectral transmittance of the neodymium-containing glass for light in the wavelength range of 575 nm to 585 nm that reduces the color purity of the emission color is 20% or less, and similarly, the color purity of the emission color is also reduced. The spectral transmittance for light in another wavelength range (500 nm to 530 nm) is also 70% or less. Thus, the glass containing neodymium reduces the color purity of the emission color from 575 nm to 585 nm.
emission spectrum and wavelength 57 of the phosphor in the wavelength range of nm
By using a glass containing neodymium for the face plate, since it efficiently absorbs the line spectrum of 8 nm of mercury, and also absorbs the emission spectrum of the phosphor in the wavelength range of 500 nm to 530 nm that similarly reduces the color purity of the emission color. The color purity of the emission color can be improved.

FIG. 3 shows a spectrum of red light emitted from the discharge display device shown in FIG. 1 to the outside. The solid line is the spectrum when the face plate made of glass containing neodymium is used, and the broken line part is the spectrum part which is additionally emitted when the face plate made of soda glass is used. Compared to the conventional soda-glass face plate, the neodymium-containing glass face plate according to the present invention effectively absorbs the emission spectrum of the phosphor in the wavelength range of 575 nm to 585 nm and the line spectrum of mercury at 578 nm, and externally. It can be seen that the color purity of the emitted red light is improved.

FIG. 4 shows a spectrum of green light emitted from the discharge display device shown in FIG. 1 to the outside. The solid line is the spectrum when the face plate made of glass containing neodymium is used, and the part shown by the broken line is the spectrum part which is additionally emitted when the face plate made of soda glass is used. Compared to the soda glass face plate, the neodymium-containing face plate is 500 nm to 530 nm and 575 nm to 585 nm.
emission spectrum of phosphor in the wavelength region of nm and mercury 5
It can be seen that the line spectrum of 78 nm is effectively absorbed and the color purity of the green light emitted to the outside is significantly improved.

FIG. 5 shows a spectrum of blue light emitted from the discharge display device shown in FIG. 1 to the outside. The solid line is the spectrum when the face plate made of glass containing neodymium is used, and the part shown by the broken line is the spectrum part which is additionally emitted when the face plate made of soda glass is used.
It can be seen that the face plate made of glass containing neodymium more effectively absorbs the line spectrum of mercury at 578 nm, and improves the color purity of blue light emitted to the outside, as compared with the face plate made of soda glass.

FIG. 6 shows a chromaticity characteristic diagram of display light by the discharge display device shown in FIG. The solid line a is the case where a face plate made of glass containing neodymium is used, and the alternate long and short dash line b is the case where a face plate made of soda glass is used. The broken line c is N
It is a TSC standard. From the figure, compared with the case of using a conventional soda glass face plate, when using the neodymium-containing glass face plate according to the present invention, the color purity of each display light is improved, and the color reproduction range is an area. You can see that it is 40% wider.

FIG. 7 shows a vertical sectional structure of a main part of a discharge display element according to another embodiment of the present invention. In this embodiment, for example, a soda glass face plate 20 is overlaid with the neodymium-containing glass 10 and adhered. With the configuration of the present embodiment, as in the above case, the color purity of each display color is improved and the color reproduction range is widened. Although the neodymium-containing glass 10 is arranged outside the face plate 20 in the embodiment of FIG. 7, the present invention is not limited to this, and the inside of the face plate 20 is not limited to this.
It may be arranged (on the side of the light emitting chamber) or may be arranged in a sandwich shape inside the face plate 20.

FIG. 8 shows the structure of a discharge display device according to still another embodiment of the present invention. (A) of the same figure is a front view, (b) is an AA sectional view. In the present embodiment, the face plate forming the display surface is adjusted to 10 in accordance with the light emitting small chambers 6a to 6d.
It is divided into small sections a to 10d. And
For example, the light emitting chambers 6a and 6c are green, 6b is red, and 6
When d is coated with a phosphor 9 that emits blue light, each of the light emitting chambers 6a and 6 is coated with a phosphor that emits green light.
The neodymium-containing glass according to the present invention is used for the face plates 10a, 10c forming the display face of c, and the face plates 10b, 10d forming the display faces of the light emitting chambers 6b, 6d coated with phosphors emitting red and blue light are conventionally used. Similarly to, for example, soda glass is used. As in the present embodiment, by using the neodymium-containing glass only for the face plate that forms the display surface of the light emitting chamber where the phosphor that emits green has the greatest effect of improving the color purity, the color purity of the green display light can be improved. By improving
The color reproduction range of the display image is widened.

FIG. 9 shows a chromaticity characteristic diagram of display light by the discharge display element shown in FIG. The solid line a is the case where glass containing neodymium is used for the face plate for green display, the chain line b is the case where soda glass is also used for the face plate for green display, and the broken line c is the NTSC standard. Compared to the case of using soda glass for the face plate for green display, the color purity of green display light is improved and the color reproduction range is 25% wider in area when the glass containing neodymium is used. I understand.

FIG. 10 shows a vertical sectional structure of a main part of a discharge display device according to still another embodiment of the present invention. In the present embodiment, the entire display surface is covered with a face plate 20 made of soda glass, for example, and only the face plate portions 10a and 10c forming the display surface of the light emitting chambers 6a and 6c coated with the green light emitting phosphor are filled with neodymium. The glasses 10a and 10c are embedded and adhered. With the configuration of this embodiment, as in the above case, the color purity of the green display light is improved and the color reproduction range of the display image is widened. Although neodymium-containing glass is embedded in the outside of the face plate 20 in the present embodiment, the present invention is not limited to this, and may be arranged inside the face plate 20 (light emitting chamber side) or inside the face plate 20. It goes without saying that it may be completely embedded in the device.

[0025]

As described above, according to the present invention,
Conventionally, the color purity of each display light color can be improved by using neodymium-containing glass for the transparent face plate itself of the discharge display element or by appropriately combining the transparent face plate made of other materials with glass containing neodymium. Since the emission spectrum part of the phosphor and the line spectrum part of mercury, which were the causes of the decrease, can be effectively absorbed by the above-mentioned glass containing neodymium, the color purity of each display light color is improved and the display image A discharge display device having a wide color reproduction range can be obtained.

[Brief description of drawings]

FIG. 1 is a front view and a vertical sectional view showing a structure of a discharge display device according to an embodiment of the present invention.

FIG. 2 is a diagram showing a spectral transmittance characteristic of glass containing neodymium.

FIG. 3 is a spectral spectrum diagram of red display light obtained from the discharge display element shown in FIG.

4 is a spectral spectrum diagram of green display light obtained from the discharge display element shown in FIG.

5 is a spectral spectrum diagram of blue display light obtained from the discharge display element shown in FIG.

FIG. 6 is a chromaticity characteristic diagram of display light obtained by the discharge display element shown in FIG.

FIG. 7 is a partially enlarged view showing a structure of a discharge display device according to another embodiment of the present invention.

8A and 8B are front and vertical sectional views showing a structure of a discharge display device according to still another embodiment of the present invention.

9 is a chromaticity characteristic diagram of display light obtained by the discharge display element shown in FIG.

FIG. 10 is a partially enlarged view showing the structure of the discharge display device according to still another embodiment of the present invention.

FIG. 11 is a front view and a vertical cross-sectional view showing a conventional discharge display element structure.

FIG. 12 is an external view of a discharge display element.

FIG. 13 is a perspective view showing a display unit configuration of a display device using a discharge display element.

[Explanation of symbols]

1 ... Discharge display element, 2 ... Common electrode, 3 ... Auxiliary anode, 4 ... Glass bulb, 5 ... Discharge tube body, 6a-6d ... Light emitting chamber, 7a-7d ... Anode, 8a-8d ...... Discharge hole, 9 ...... Phosphor, 10 ...... Translucent face plate (glass with neodymium), 10a to 10d ...... Translucent face plate (glass with neodymium), 20 ...... Translucent face plate (soda glass) .

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Kaiji Arai 888 Fujibashi, Ome-shi, Tokyo Hitachi Ltd. Heater Lighting Division

Claims (9)

[Claims] 1. A discharge display element having a translucent face plate as a display surface, characterized in that all or part of the translucent face plate is made of glass containing neodymium. 2. A discharge display element having a translucent face plate forming a display surface, characterized in that all or part of the translucent face plate is combined with neodymium-containing glass. . 3. A discharge tube body having a translucent face plate forming a display surface, a plurality of light emitting chambers partitioned and formed in the discharge tube body in a direction parallel to the face plate, and each of the plurality of light emitting chambers. In a discharge display element comprising a phosphor layer formed on an inner wall surface and a means for generating a discharge in each of the plurality of light emitting chambers, all or any part of the translucent face plate A discharge display element comprising a glass containing neodymium. 4. The plurality of light-emitting small chambers having a phosphor layer emitting red light on the inner wall surface thereof, a phosphor layer emitting green light, and a phosphor emitting blue light. The discharge display element according to claim 3, wherein the discharge display element is composed of three types including a layer formed. 5. The neodymium-containing glass according to claim 4, wherein only the face plate portion corresponding to the light emitting small chamber in which the phosphor layer emitting green light is formed on the inner wall surface. Discharge display element. 6. A discharge tube body having a translucent face plate forming a display surface, a plurality of light emitting chambers partitioned and formed in the discharge tube body in a direction parallel to the face plate, and each of the plurality of light emitting chambers. In a discharge display element comprising a phosphor layer formed on an inner wall surface and a means for generating a discharge in each of the plurality of light emitting chambers, all or any part of the translucent face plate A discharge display device, characterized in that it is configured by combining glass with neodymium. 7. The plurality of light-emitting small chambers having a phosphor layer that emits red light formed on the inner wall surface thereof, a phosphor layer that emits green light, and a phosphor that emits blue light. 7. The discharge display element according to claim 6, wherein the discharge display element is made of three types including a layer formed. 8. A neodymium-containing glass is combined only in a face plate portion corresponding to a light emitting small chamber in which a phosphor layer emitting green light is formed on the inner wall surface. The discharge display element described. 9. An image display device comprising a plurality of the discharge display elements according to claim 1 and two-dimensionally arranged with their face plate surfaces aligned.