JPH09268029A - Color filter material for plasma display - Google Patents

Abstract

(57) Abstract: To provide a red color filter material for a display, which has a high contrast of a displayed image and a high transmittance of an emission color. A transparent glass and a coloring material are used, and the coloring material has Ag: 0.01 to 5 parts by weight and Au: 0.01 when the total amount of the transparent glass and the coloring material is 100 parts by weight.
.About.5 parts by weight and Sn or Cr: 0.01 to 5 parts by weight in a composition range, wherein ions, colloids, metal complex salts, and metal oxides are melted in the transparent glass as a single substance or a mixture. Red color filter material for transparent displays.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a red color filter (hereinafter referred to as CF) used for a display such as a plasma display panel (hereinafter referred to as PDP), an electroluminescence display (hereinafter referred to as EL) and a cathode ray tube (CRT). Abbreviated) regarding materials.

[0002]

2. Description of the Related Art In general, a PDP has a structure in which a pair of electrodes arranged regularly on two opposing glass substrates are provided, and a gas mainly composed of Ne or the like is sealed between them. Then, a voltage is applied between these electrodes, and a discharge is generated in minute cells around the electrodes, so that each cell emits light to perform display. In order to display information, regularly arranged cells are selectively caused to emit light. This PDP has a direct current type (DC type) in which electrodes are exposed to the discharge space and an alternating current type (A) in which electrodes are covered with an insulating layer.
C type), and both types are further classified into a refresh driving method and a memory driving method according to differences in display functions and driving methods.

FIG. 1 shows a configuration example of an AC type PDP. This figure shows the front plate and the back plate separated from each other. As shown in the figure, two glass substrates 1 and 2 are arranged in parallel and opposite to each other. Are arranged in parallel and opposite to each other on the glass substrate 2 and the protective layer 7 (MgO layer) is further formed thereon. Address electrodes 8 are formed in parallel with each other on the front side of the glass substrate 2 serving as a back plate so as to be orthogonal to the composite electrode and between the barrier ribs 3. Phosphor 9 is provided so as to cover the bottom surface.

This AC type PDP is a surface discharge type, and has a structure in which an AC voltage is applied between the composite electrodes on the front plate and the electric field leaks into the space to discharge. In this case, since the alternating current is applied, the direction of the electric field changes according to the frequency. Then, the ultraviolet rays generated by this discharge cause the phosphor 9 to emit light, and the observer visually recognizes the light transmitted through the front plate. By the way, various improvements have been made in the color PDP as described above. However, in the conventional PDP, the display brightness is not sufficient, and the contrast of the displayed image is not sufficiently obtained at present.

To make the display of the PDP easy to see,
It is effective to reduce the reflectance of the image display surface and improve the contrast of the displayed image. As a means for achieving this, for example, the front plate is provided with an ND (Neutral Density) filter characteristic. Nd ₂ O ₃ is put in the front plate to give absorption characteristics outside the main spectrum of the luminous body. Fill the area other than the fluorescent layer with a low-reflection material. That is, a black matrix (hereinafter referred to as BM) is formed. A pigment having the same color as the emission color is mixed in the fluorescent layer. A pigment layer is formed before the fluorescent layer. A CF that transmits only a single wavelength of the emission spectrum is provided for each of the red, green, and blue cells. And so on.

However, it is effective to use CF with BM in order to increase the contrast while minimizing the decrease in luminance. In a color PDP, it is necessary to provide these BM and CF inside the front plate in view of the viewing angle of a display image.

However, with such a configuration,
Both BM and CF are 450 to 5 in the substrate manufacturing process.
It is required that the material withstands a high temperature of about 80 ° C. or more, and that no gas is generated during this treatment. In this respect, the CF currently used for the liquid crystal display element cannot be used as it is as the CF of the PDP.

As conventional heat-resistant CF materials made in view of the above background, (A) a material in which an inorganic pigment is dispersed in a low-melting transparent glass frit, and (B) a metal or a metal oxide is colored. Colored glass as an ingredient may be mentioned. Although there are many kinds of the above-mentioned inorganic pigments A, as typical ones,
Iron (red), manganese aluminate (pink), gold (pink), antimony-titanium-chromium (orange), iron-chromium-zinc (yellow), iron (brown), titanium-chromium. (Yellowish brown), antimony-titanium-chromium system (yellow), zinc-vanadium system (yellow), zirconium-vanadium system (yellow), chromium system (green), vanadium-
There are chrome (green), cobalt (blue), cobalt aluminate (blue), vanadium-zirconium (blue), cobalt-chromium-iron (black), etc., and these should be mixed to match the color tone. Is also possible.

When the above inorganic pigment is used, pigment particles having a particle size of 1 μm or more account for 10% by weight of all particles.
It is desirable that: That is, if there are many pigment particles having a large particle diameter, the light transmittance of CF is lowered, and the luminance is lowered. Further, it is desirable that pigment particles having a particle diameter of 0.01 to 0.7 μm account for 20% by weight or more of all particles.

There are many kinds of the above-mentioned B colored glass due to its coloring mechanism. In addition, the color of the colored glass changes depending on the conditions even with the same raw material. As an example, the frit includes silicic acid (SiO ₂ ), lead oxide (PbO), potassium oxide (K ₂ ).
O), boric acid (B ₂ O ₃ ), aluminum fluoride (AlF
₃ ), potassium lead glass containing arsenic oxide (As ₂ O ₃ ) and the like is the main component, and the raw materials are silica stone, lead oxide, yellow lead oxide, lead white, potassium nitrate, boric acid, borax, sodium bicarbonate, fluoride. Etc. are used.

According to the conventional technique, a coloring material is added to the above glass in an amount of about 0.01% by weight to form a colored glass. Coloring agents include arsenous acid (white), tin oxide (white), copper oxide (green), cobalt oxide (blue), potassium dichromate (yellow), antimony oxide (yellow), iron oxide (brown), manganese dioxide. (Purple), nickel oxide (purple), gold chloride W
(Red), sodium uranate (orange), selenium red (red)
Etc. are combined and mixed. Then, these are mixed, melted by heating, vitrified, and cooled and ground before use.

A PDP made in view of the above background
As a conventional technology developed as a CF material for automobiles, Japanese Patent Publication No. 3-332 by Okuno Chemical Industries Co., Ltd. and the Japan Broadcasting Corporation
Japanese Patent Publication No. 43 (inorganic material optical filter for red light) is known. In Japanese Patent Publication No. 3-33243, the material containing copper sulfate is attached to the tin surface of the applied glass or the float glass substrate slightly impregnated with tin and fired to obtain colored glass. The portion to which the material containing copper sulfate is attached is such that the copper ions of copper sulfate and tin on the substrate are exchanged during baking to become monovalent copper ions, and the glass turns red.

[0013]

In the above conventional technique, the inorganic pigment A has a low transmittance due to light scattering caused by the pigment particle size. Further, the color peculiar to the inorganic pigment having the spinel structure has a problem that the contrast of the displayed image is lower than that of the B colored glass. As described above, the system in which the inorganic pigment is dispersed in the transparent glass frit has an advantage that the CF film thickness can be made thin (2 to 3 μm), but has a problem that the transmittance is low and the contrast is low.

Further, in the system using the colored glass containing about 0.01% by weight of the colorant such as B, it has an advantage of high transparency, but the film thickness becomes 20 It becomes almost colorless at ˜30 μm, and a thin film (10 μm) cannot be used for required CF. Therefore, there is no example of CF using colored glass. Further, the inorganic material optical filter for red light disclosed in Japanese Examined Patent Publication No. 3-33243 between Okuno Pharmaceutical Co., Ltd. and the Japan Broadcasting Corporation, which is a compromise between A and B, has the following problems.

Since red has a CF film thickness of 1 μm or less in order to be formed by an ion exchange method, green and blue films require a CF film thickness of 2 to 3 μm or more due to the formation process. For this reason, a step difference in film thickness occurs between the respective color filter pixels, which hinders the formation of a high-definition electrode pattern provided on the CF. Due to its color development mechanism, red must have a slight tin content in the substrate to be formed. Therefore, when a glass substrate other than the float glass is used, or a treatment for infiltrating tin into the substrate is required.

Therefore, an object of the present invention is to solve the above-mentioned problems of the prior art and to provide a red CF material for a display which has a high contrast of a displayed image and a high transmittance of a luminescent color.

[0017]

The above object is achieved by the present invention described below. That is, the present invention comprises transparent glass and a coloring material, and when the total amount of the transparent glass and the coloring material is 100 parts by weight, Ag: 0.01 to 5
Parts by weight, Au: 0.01 to 5 parts by weight and Sn or Cr:
A transparent red CF material for a display, characterized in that, in the composition range of 0.01 to 5 parts by weight, ions, colloids, metal complex salts, and metal oxides are melted in the above-mentioned transparent glass as a single substance or a mixture. .

As a result of various studies to solve the above-mentioned problems of the prior art, the present inventor compared with the conventional example when adding a metal or a metal oxide, which is a coloring material for transparent glass, to the transparent glass. Add 1 to 2 digits more, and add as a colorant in a ratio of Ag: 0.01 to 5 parts by weight, Au: 0.01 to 5 parts by weight and Sn or Cr: 0.01 to 5 parts by weight. It was found that by doing so, a red CF material for a display having a high contrast of a displayed image and a high transmittance of a luminescent color can be obtained.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Next, the present invention will be described in more detail with reference to embodiments. The transparent red CF material for a display of the present invention comprises a transparent glass and a coloring material, and when the total amount of the coloring glass and the coloring material is 100 parts by weight, Ag: 0.01-5. Parts by weight, Au: 0.0
1 to 5 parts by weight and Sn or Cr: 0.01 to 5 parts by weight in a composition range, wherein the ion, colloid, metal complex salt, or metal oxide as a single substance or a mixture is melted in the transparent glass. There is.

The Ag used as the coloring material in the present invention is in the form of, for example, metal Ag, Ag ₂ O, AgNO ₃ or the like,
Such Ag is used in a proportion of 0.01 to 5 parts by weight when the total amount of the transparent glass and the coloring material is 100 parts by weight (the same applies hereinafter), and more preferably in a proportion of 0.05 to 5 parts by weight. use. Au is in the form of, for example, AuCl ₃ or colloidal Au, and the Au is 0.01
It is used in an amount of 5 to 5 parts by weight, more preferably 0.0
It is used in a proportion of 5 to 2 parts by weight. Also, Sn is, for example,
SnO or the like, and Cr is, for example, Cr ₂ O ₃ ,
It is in the form of Na ₂ CrO ₄ , K ₂ Cr ₂ O _7, etc., and is used in a ratio of Sn or Cr: 0.01 to 5 parts by weight, more preferably 0.05 to 5 parts by weight. To do.

When the amount of Ag used is less than the above range, when the colored glass is used, the violet coloration of Au, which is the coloration of Au, becomes strong and deviates from the desired red wavelength.
When the amount of g used is larger than the above range, Ag becomes a metal colloid (metal particle) in the glass, and the light transmittance of the colored glass obtained is lowered. Ag is deposited as a metal film on the surface, and the light transmission property is completely lost.

When the amount of Au used is less than the above range, the yellow color becomes strong when the colored glass is used, and the desired red wavelength cannot be obtained. On the other hand, when the amount of Au used is more than the above range. In such a case, Au becomes a metal colloid (metal particles) in the glass, and the light transmittance of the obtained colored glass is lowered. It loses its light transmission property.

Sn acts as a reducing agent for accelerating the ionization of Ag and Au in the glass. However, when the amount of Sn used is less than the above range, the amount of Ag required for making colored glass is And ionization of Au is not obtained, and when the amount of Sn used is larger than the above range, more Sn than necessary is deposited in the glass as a metal or a metal oxide and does not become a transparent glass. , The emulsion glass (pearly white) is changed, and the light transmittance of the obtained colored glass decreases.

When the amount of Cr used is less than the above range, the bluish purple becomes strong when colored glass is used, and the desired red wavelength cannot be obtained, while the amount of Cr used is more than the above range. In such a case, the green color of the obtained colored glass becomes strong, and when it is further increased, Cr is precipitated as chromium oxide in the obtained colored glass, and the light transmittance is lowered.

As described above, in the present invention, when the total amount of the transparent glass and the colorant is 100 parts by weight, each colorant is added in the above ratio. If the amount of the coloring material used is too small, when CF is used, if a thin film having a thickness of about 10 μm is used, sufficient coloring cannot be obtained. Further, if the amount of the coloring material used is too large, the light transmittance of the obtained colored glass is lowered. In the present invention, various types of transparent glass are used as the transparent glass for melting the coloring material to obtain colored glass, but the glass composition described below is preferable.

In Table 1, the components constituting a general low melting point transparent glass frit and the components are classified as follows from the viewpoint of the physical properties of glass. Table 1. Composition of transparent glass frit and its physical property classification Classification Representative constituents a PbO a Bi ₂ O ₃ a ZnO a CdO, other b SiO ₂ b Al ₂ O ₃ b SnO, other c B ₂ O _{3, other} d Na ₂ O d K ₂ O, and other e CaO, other f ZrO ₂ f TiO _2, other

The group a is an oxide of Bi, Zn or Cd in addition to Pb, and in the low melting point transparent glass frit,
Any one of these or a mixture thereof is contained in an amount of 0.1 to 90% by weight. Further, the ideal content is preferably in the range of 30 to 80% by weight. The effects of these components on the physical properties of the obtained glass are briefly described below. Lower the softening point. Slightly deteriorates chemical durability. Increase the refractive index. The characteristics such as thermal expansion characteristics are changed.

The b group includes Si, Al, Sn, Sb,
The low melting point transparent glass frit is an oxide of Ce or La and contains 0.1 to 70% by weight of any one of them or a mixture thereof. Further, the ideal content is desirably in the range of 1 to 30% by weight. The effects of these components on the physical properties of the obtained glass are as follows. Raise the softening point. Slightly improve chemical durability. The thermal expansion property is slightly reduced. Affects other properties.

The c group is an oxide of B or P,
The low melting point transparent glass frit contains 0.1 to 50% by weight of any one of them or a mixture thereof. Further, the ideal content is desirably in the range of 1 to 25% by weight. The effects of these components on the physical properties of the obtained glass are as follows. Lower the softening point. Slightly lowers chemical durability. Decrease the refractive index. Reduces thermal expansion. In addition, the hardness and elastic modulus are changed.

The d group is Li, which is an alkali metal,
It is an oxide of Na or K. These components affect the following physical properties of the obtained glass. Lower the softening point. Reduces chemical durability. Increases thermal expansion. In addition, the hardness and elastic modulus are changed.

Group e is an alkaline earth metal M
It is an oxide of g, Ca, Sr, or Ba. These components affect the following physical properties of the obtained glass. Affects softening point. Chemical durability is improved. Change other properties, refractive index, hardness or elastic modulus.

The f group is an oxide of Ti or Zr, and these components have the following effects on the physical properties of the glass obtained. Improves chemical durability (acid resistance, base resistance). Raise the softening point. The g group is S, F or Cl, and these components have the following effects on the physical properties of the glass obtained. Improved meltability. Affects frit characteristics.

In the low melting point glass frit, the above d,
e, f and g contain 0.1 to 50% by weight of at least one of them or a mixture thereof, and
A content of 0% by weight is ideal. Further, as a small amount of additives other than the above group, an oxide of Fe, Mo, Mn or W may be added in a range in which the transparent glass frit is not colored, for example, 0.25% by weight or less. Further, Rb, Cs or Fr which is an alkaline earth metal can be used in place of Li, Na and K which are alkali metals.

As a result of the above examination, the preferable composition of the transparent glass for melting the coloring material is PbO: 30.
80 parts by _weight, SiO 2: 0.5 to 30 parts by _{weight, B} 2 O
₃ : 1 to 25 parts by weight, Al ₂ O ₃ : 1 to 30 parts by weight, Z
nO: 4 to 15 parts by _weight, K 2 O: 0.05 to 30 parts by weight and CaO: a lead borosilicate glass consisting of 0.05 to 30 parts by _weight, Bi ₂ O 3: _30~80 parts by weight, SiO ₂ : 1
35 parts by _weight, B ₂ O 3: _1~25 parts by weight, Al
₂ O ₃ : 0.1 to 30 parts by weight, Na ₂ O: 0.1 to 30
Parts by weight, Li ₂ O: 0.05 to 30 parts by weight, K ₂ O:
0.05 to 30 parts by weight and TiO ₂ or BaO: 0.
Bi-10% by weight of bismuth glass, Zn
O: 20 to 80 parts by weight, SiO ₂ : 1 to 40 parts by weight, B
₂ O _3: 1 to 30 parts by _weight, Al ₂ O 3: _0.1~30 parts by _weight, Li 2 O: _0.1~30 parts by weight, _TiO 2: 0.
Zinc-based glass consisting of 1 to 10 parts by weight and F: 0.1 to 30 parts by weight, ZnO: 20 to 80 parts by weight, SiO ₂ :
1 to 40 parts by weight, B ₂ O ₃ : 1 to 30 parts by weight, Al ₂ O
₃ : 0.1 to 30 parts by weight, Na ₂ O: 0.1 to 30 parts by weight, and ZrO ₂ : 0.1 to 10 parts by weight, which is a composition selected from one or more of zinc-based glasses. .

The more preferable composition of the transparent glass in the present invention is as follows. PbO: 50 to 65 parts by weight, S
iO _2: 0.5 to 5 parts by _weight, B ₂ O 3: _10~25 parts by _weight, Al ₂ O 3: _2~15 parts by weight, ZnO: 4 to 15 parts by _weight, K 2 O: _0.05~2 Parts by weight and CaO: 0.0
Lead borosilicate glass consisting of 5 to 1 parts by weight, Bi ₂ O ₃ : 4
0 to 60 parts by _weight, SiO 2: 20 to 35 parts by _{weight, B} 2 O
_3: 3-15 parts by _weight, Al ₂ O 3: 0.1 to 5 parts by _weight, Na 2 O: 1 to 8 parts by _weight, Li 2 O: 0.05 to 5
Bismuth-based glass consisting of 1 part by weight, K ₂ O: 0.05 to 3 parts by weight and TiO ₂ or BaO: 0.05 to 4 parts by weight,

ZnO: 20-40 parts by weight, SiO ₂ : 1
5-40 parts by _weight, B ₂ O 3: _20~30 parts by weight, Al ₂
O _3: 0.5 to 5 parts by _weight, Li 2 O: 1 to 12 parts by weight,
TiO ₂ : 0.5 to 5 parts by weight and F: 0.5 to 5 parts by weight of zinc-based glass and ZnO: 20 to 40 parts by weight,
SiO _2: 15 to 40 parts by _weight, B ₂ O 3: _20~30 parts by _weight, Al ₂ O 3: _0.5~5 parts by _weight, Na 2 O: _4~
12 parts by weight and ZrO ₂ : 0.5 to 5 parts by weight, which is a composition selected from any one or more of zinc-based glasses.

The red CF material of the present invention is made into a paste by using an appropriate organic medium at the time of use. The organic medium used for forming the paste is preferably a medium composed of a resin such as an acrylic resin, an ethyl cellulose resin, an alkyd resin and a solvent such as terpineol or butyl carbitol acetate (BCA). An appropriate amount of powder of the red CF material is mixed with the medium and kneaded with a three-roll mill or the like. The viscosity of the obtained red glass paste is 10 by adjusting the amount of organic medium.
It is preferable to adjust it to about 0 to 1,000 poise.

The red CF is formed by coating the above-mentioned red glass paste on the display substrate by pattern printing by screen printing, coating the entire surface of the substrate with a roller coater, curtain coater or the like to form a continuous film. Is performed by a method such as patterning by a sandblast method or the like. The red CF is obtained by firing the patterned substrate by the above method.

[0039]

Next, the present invention will be described more specifically with reference to examples and comparative examples. Example 1 The materials shown in Table 2 below were mixed, and the temperature was 800 to 1,300 ° C.
Melt evenly at high temperature. Then, it was poured into water and rapidly cooled to obtain a colored glass powder having a particle size of 1 to 5 μm. The glass powder was further finely crushed with a crushing device such as a ball mill to obtain colored glass. The colored glass thus obtained was kneaded with an organic medium shown in Table 3 below by a three-roll mill to obtain a paste of a red CF material. The paste had a viscosity of 500 poise.

The obtained red CF material paste was mixed with 30
Use 0 mesh screen plate, 1 on the glass substrate
Screen printing was performed to a thickness of 0 μm. Then, after drying at 170 ° C. for 30 minutes, a heat gradient of 350 to 580 ° C. was created, and baking was performed at 580 ° C. for 20 minutes or more, for a total of 120 minutes. The belt speed was 80 mm / min. The spectral characteristics of CF obtained in this example are shown in FIG.

Table 2 Composition of colored glass used in this example "Trace" is an impurity in the ppm order.

Table 3 Composition of color glass paste

Comparative Example 1 (Example of Dispersing Inorganic Pigment in Transparent Glass) The following inorganic pigments were used. Red pigment: Transparent iron oxide (trade name TOR, αFe ₂ O ₃ acicular powder) manufactured by Dainichiseika Kogyo Co., Ltd. The above pigment was ball milled to a particle size of 0.01 to 0.5 μm.
Finely divided into fine particles and this finely divided inorganic pigment
Colorless transparent glass frit (trade name D-2141) made by T & D CERATEC and organic medium are weighed with a stirring mixer with the following composition and sufficiently mixed, and then each component is kneaded with a three-roll to make it suitable for a screen. The viscosity was adjusted to fit.

Composition : Inorganic pigment 10.0 parts by weight Glass frit 70.0 parts by weight Organic medium 20.0 parts by weight Composition of organic medium : terpineol solvent 95.0 parts by weight Cellulose resin 5.0 parts by weight Examples A CF was prepared in the same manner as in 1. The spectral characteristics of the CF obtained in this comparative example are shown in FIG.

As is apparent from FIG. 3 according to the present invention and FIG. 4 according to the comparative example, the transmittance of the red filter according to the present invention in the above-mentioned phosphor emission wavelength region is 60 to 80%.
30% in the bottom region other than the emission wavelength of the phosphor
It is as follows. On the other hand, in FIG. 4 using the inorganic pigment of the prior art, the transmittance in the phosphor emission wavelength region is 7
Although it has achieved 0% or more, the bottom is as large as 40 to 50%, and it can be seen that the contrast is lower than that of the present invention.

Application Example Referring to FIG. 2, glass substrate 1, transparent electrode 4, bus electrode 5
The AC type front plate formed up to C protects the lower layer of CF
The F protective layer 6a was formed by solid printing and drying with a calendar plate of screen mesh 150. WX-883 manufactured by T & D CERATEC Co., Ltd. was used for the CF protective layer 6a. The drying condition was 170 ° C. for 30 minutes. When this 6a is not fired, it is a black glass paste, T & T Co., Ltd.
BM7 was formed with a stainless plate of the screen mesh 500 using W CERATEC WX-5890 black, and the CF protective layer 6a and BM7 were fired at the same time.

For the firing at this time, a belt type firing furnace is used, a thermal gradient of 350 to 600 ° C. is formed, and the temperature is 600 ° C. for 20 hours.
Baking for more than 120 minutes, for a total of 120 minutes. The belt speed was 80 mm / min. After the CF protective layer 6a and BM7 are fired, the red glass paste of the present invention, the green glass paste and the blue glass paste T Co., Ltd.
A CF pattern 7 was formed by sequentially printing each color with a 400 mesh screen plate using & D CERATEC D-11699 green and D-12601 blue. After forming CF, it is dried at 170 ° C. for 30 minutes and then 35
A heat gradient of 0 to 580 ° C. was created, and baking was performed at 580 ° C. for 20 minutes or longer, and for a total of 120 minutes. Belt speed is 80
mm / min.

After that, a CF protective layer 6 for protecting the CF upper layer
b was solid-printed and dried under the same conditions as 6a, and baked under the above baking conditions. The D-2141 is formed on the CF protective layer 6b.
Was used. Further, in this embodiment, since the CF protective layer 6b is highly transparent, it also functions as a dielectric layer and is applied to a film thickness of about 15 μm (dry film thickness). The firing of D-2141 used for the CF protective layer 6b is 350 to 51.
A thermal gradient of 0 ° C. was created, and baking was performed at 510 ° C. for 20 minutes or longer, and 120 minutes in total. Belt speed is 80mm / mi
n. After firing, the MgO layer 8 is formed, and CF and C
A PDP front plate with an F protective layer was completed.

[0049]

According to the present invention as described above, it is possible to provide a red CF material for a display which has a high contrast of a displayed image and a high transmittance of a luminescent color.

[Brief description of drawings]

FIG. 1 is a diagram showing a configuration example of an AC type PDP.

FIG. 2 is a cross-sectional view showing a front plate of a PDP not provided with CF.

FIG. 3 is a view showing spectral characteristics of CF obtained in Example 1.

FIG. 4 is a diagram showing CF spectral characteristics by a conventional method.

[Explanation of symbols]

 1, 2: glass substrate 3: barrier rib 4 :, 5: electrode 6: dielectric layer 7: protective layer 8: address electrode 9: phosphor

Claims (2)

[Claims] 1. A transparent glass and a coloring material, wherein the coloring material, when the total amount of the transparent glass and the coloring material is 100 parts by weight, is Ag: 0.01 to 5 parts by weight, Au: 0. 01
.About.5 parts by weight and Sn or Cr: 0.01 to 5 parts by weight in a composition range, wherein ions, colloids, metal complex salts, and metal oxides are melted in the transparent glass as a single substance or a mixture. Red color filter material for transparent displays. 2. The transparent glass to be melted is PbO: 30.
80 parts by _weight, SiO 2: 0.5 to 30 parts by _{weight, B} 2 O
₃ : 1 to 25 parts by weight, Al ₂ O ₃ : 1 to 30 parts by weight, Z
nO: 4 to 15 parts by _weight, K 2 O: 0.05 to 30 parts by weight and CaO: a lead borosilicate glass consisting of 0.05 to 30 parts by _weight, Bi ₂ O 3: _30~80 parts by weight, SiO ₂ : 1
35 parts by _weight, B ₂ O 3: _1~25 parts by weight, Al
₂ O ₃ : 0.1 to 30 parts by weight, Na ₂ O: 0.1 to 30
Parts by weight, Li ₂ O: 0.05 to 30 parts by weight, K ₂ O:
0.05 to 30 parts by weight and TiO ₂ or BaO: 0.
Bi-10% by weight of bismuth glass, Zn
O: 20 to 80 parts by weight, SiO ₂ : 1 to 40 parts by weight, B
₂ O _3: 1 to 30 parts by _weight, Al ₂ O 3: _0.1~30 parts by _weight, Li 2 O: _0.1~30 parts by weight, _TiO 2: 0.
Zinc-based glass consisting of 1 to 10 parts by weight and F: 0.1 to 30 parts by weight, ZnO: 20 to 80 parts by weight, SiO ₂ :
1 to 40 parts by weight, B ₂ O ₃ : 1 to 30 parts by weight, Al ₂ O
_{3. A} zinc-based glass consisting of 0.1 to 30 parts by weight, Na ₂ O: 0.1 to 30 parts by weight, and ZrO ₂ : 0.1 to 10 parts by weight, which is selected from one or more kinds. A red color filter material for a display according to.