JPH05319870A - Inorganic material optical filter for green light - Google Patents

Abstract

(57) [Summary] [Object] The present invention is used in a display device in which display elements which emit a plurality of different kinds of color light are combined, and in particular, the efficiency of reflection of ambient light is high and the contrast is high. The present invention relates to an inorganic material optical filter for green light obtained. [Structure] A transparent glass powder containing 0.5 to 6% by weight of Cr ₂ O _3, 0.5 to 6% by weight of CoO, and 6% by weight or less of CuO as a colored glass component was obtained by applying or adhering the transparent glass powder to an applicable glass substrate and firing. An inorganic material optical filter for green light, which is characterized in that 80 to 99% by weight of transparent glass powder containing 6% by weight or less of CuO as a coloring glass component, and CoO
Inorganic material optics for green light, characterized by being obtained by applying or adhering a green pigment of 20 to 1% by weight containing Cr ₂ O ₃ and Al ₂ O ₃ on an applicable glass substrate and firing it. filter.

Description

Description: BACKGROUND OF THE INVENTION The present invention relates to a plurality of different types of colored light.
Used in a display device that combines display elements that emit
In particular, the efficiency of preventing reflection of ambient light is high and the high
Inorganic material optical filter for green light that provides trust
It is about. 2. Description of the Related Art Generally, a cathode ray tube display device and a discharge display device are provided.
For various display devices such as panels and low-speed electron beam fluorescent display panels
In addition to increasing the display brightness,
Increase the display contrast by reducing the reflectance of the
It is necessary that the display brightness is at a certain level
If it reaches, it is better to increase the contrast.
In some cases it may improve the quality of the presentation. To increase the contrast of the display, a table
In order to reduce the reflectance of the display surface, conventionally, the following various
Means have been used. (I) Absorption type neutral
Display surface made of glass plate, etc.
Attached to or attached to the surface of
of. (Ii) Nd on the glass material that forms the display surface ₂ O ₃ Rare earth such as
By adding a group of elements, the emission brightness of the phosphor that forms the display element
Increased light absorption of the display face plate in the lower part.
(iii) Display is performed by mixing a pigment in the fluorescent substance that forms the display element.
Increased absorption of light with wavelengths outside the optical range.
(Iv) Black substance on the part of the display element other than the fluorescent substance
By increasing the absorption of ambient light. (V)
Filter by attaching the pigment in the form of particles to the front surface of the phosphor
-What However, the above-mentioned conventional contrast
Each of the increasing means has the following drawbacks.
The use of the ND filter in (i) increases the contrast.
However, the brightness is lowered. For (ii) glass
The addition of rare earth elements has better results than the above-mentioned means (i).
Optical transmission of the additive material near the wavelength of 555 nm
The effective visual reflectance does not decrease so much
Yes. Mixing of the pigment in the phosphor of (iii) causes
It is effective in a cathode ray tube display device with a margin,
For other display devices that do not have much room for display brightness
Is probably difficult to apply and the reflectance
The degree of decline is effectively only about 1/2 at most.
Recognized as Black absorption in areas other than the light emitting part of (iv)
Adhesion of material is effective for all display devices, but
Stay in the auxiliary means. (V) Granular pigment on the front of the phosphor
When the filter is attached, the dye inside the filter does not form particles.
And the reflection due to light scattering at the particle interface
Large and opaque makes it impractical and also the front
There is a small gap between the back of the glass plate and the filter layer.
When this occurs, light is reflected at the interface of the air gap,
Cause a decrease in the last. The present inventors have eliminated the above-mentioned conventional drawbacks.
The display device, especially color image
Inorganic material optics that effectively increase the contrast of display tubes
Invented a color display device using a filter and applied first
(JP-A-59-36280, display device). Ie the above
In the conventional invention, a plurality of different types of displays are displayed.
In a display device comprising a combination of elements, the display element
Almost transparent to transmit the color light emitted by each
Applying an optical filter made of transparent inorganic glass material,
Clarified in the section of the above publication (Detailed Description of the Invention)
Finally, the optical filter is provided in each discharge cell of the display device.
(Specifically, three types of red, green and blue color filters are suitable.
4 times the contrast compared to the case without
Have improved. Moreover, because the filter is applied
The decrease in brightness is suppressed to about 20%. SUMMARY OF THE INVENTION The present inventors
In Japanese Patent Laid-Open No. 59-36280 described in the section of (Technology),
Three types of inorganic optical filters that have never been applied before
Is applied to each of the three types of discharge cells of the color display device to increase the brightness.
I have improved the contrast without worrying about it.
Without being satisfied with this, further to the optical filter
Continued detailed examination of materials and prototype measurement of filters
I've been [Means for Solving the Problems] The optical fill described in the preceding paragraph
Detailed examination of the target material, the result of the filter prototype measurement, red
Color filters, green filters, blue filters, or new
Conventional materials or new composition ratio found
Not only the contrast improvement of, but also the saturation of colored light,
Knows that it can also be used to color the emission that is close to achromatic
For example, in future discharge display devices for high-definition television.
It turned out to be suitable when applied. Of the three types of colored light described above, the present invention is directed to green colored light.
The present invention relates to an optical filter for use in
On the street. 1st invention Cr as a glass component ₂ O ₃ 0.5-6% by weight, CoO 0.5
~ 6 wt%, CuO 6 wt% or less transparent glass powder containing
By applying or adhering to an applicable glass substrate and baking.
Inorganic material optical fiber for green light characterized by being obtained
Filter. Second invention Transparent glass containing 6% by weight or less of CuO as a colored glass component
80-99% by weight of powder, CoO and Cr ₂ O ₃ And Al ₂ O ₃ Including and
Applicable glass substrate consisting of 20% to 1% by weight of green pigment
What was obtained by applying or adhering to the product and firing
An inorganic material optical filter for green light. The operation of the optical filter for green light of the present invention is shown in FIG.
Excessive (τ) characteristic curve (G _N ) Is a display to which the present invention is applied
Spectral characteristics (G) of the green phosphor of the device, luminosity curve
Line [Outside 1] And the optical file for green light of the prior application (JP-A-59-36280).
Luther transmittance characteristic curve (G _O ). Desired
Transmission in the spectral characteristic (G) region of the green phosphor
The rate is significantly improved and the transmission is reduced in other areas.
As a result, when viewed comprehensively, only the green color light is contrasted.
The ratio is improved to about 1.5 times that of the previous application. The following is an outline of a filter manufacturing example of the present invention,
Transparent glass powder material to be mixed with the above-mentioned essential ingredients, before
Screen oil and filter material used when mixing
Other technical matters at the time of adhesion will be sequentially described. (I) Outline of filter manufacturing Glass that becomes transparent by burning on the applicable substrate glass at 700 ° C or less
Cr as a coloring glass component of powder ₂ O ₃ 0.5-6% by weight,
CoO 0.5 to 6% by weight, CuO 6% by weight or less (preferably 0.
1 to 6% by weight) and the glass powder containing it is applied
Apply or adhere to the surface of plate glass and bake at 450 to 650 ° C.
Get a filter by making. The substrate glass is flat
You don't have to be a carrier. In yet another embodiment, the transparent
Gas containing 0 to 6% by weight of CuO as a coloring component of glass powder
Lath powder 80-99% by weight and CoO in Cr ₂ O ₃ And Al ₂ O ₃ Tokara
Glass paste consisting of 1 to 20% by weight of green pigment
Apply or attach to the applicable substrate in the same manner as described above, 450 to 650
A filter is obtained by baking at ° C. (II) Transparent glass powder material Transparent glass powder
As a material, it can be used as a substrate glass for filters at 700 ℃
Glass that can be burned, preferably below 600 ° C
Transparent, any desired glass can be used
It For example, the following PbO-SiO ₂ -B ₂ O ₃ -ZnO-based glass
It Silica powder 10.0 parts by weight lead tin 64.4 parts by weight boric acid 30.2 parts by weight zinc white 3.0 parts by weight aluminum hydroxide 3.0 parts by weight potassium carbonate 3.3 parts by weight [0014] In addition to this, PbO-SiO 2 ₂ -B ₂ O ₃ Glass, PbO-
B ₂ O ₃ -Zn ₂ O-based glass, Bi ₂ O _3- SiO ₂ -B ₂ O ₃ Glass and P
bo, Bi ₂ O ₃ There is lead-free glass that does not contain. Also on these
R on the glass ₂ O (R = Li, Na, K), BaO, CaO, MgO, N
aF, TiO ₂ , ZrO ₂ , Al ₂ O ₃ , P ₂ O _Five At least one of
Glass including the above can also be used. (III) Example of screen oil Ethylene glycol monobutyl ether acetate 85 parts by weight Terpineol 10 parts by weight Ethyl cellulose 4 parts by weight Acrylic resin 1 part by weight In addition, the weight of the above-mentioned glass powder and screen oil
A ratio of 2.5 to 5 parts to 1 part is preferred. (IV) Deposition method of filter material Screen printing is 100 to 40 depending on the accuracy of the pattern.
Perform on a 0 mesh screen. Also, the black lattice etc.
It may be printed on and co-fired. Photo etching is next
Do so. Various transparent glass pastes mentioned above
Apply evenly on a glass substrate and apply a temperature of about 150 ° C.
, Or semi-baking at a temperature of about 300 ° C
After removing, remove the positive or negative
Area to be coated with photoresist and removed by etching
Alternatively, apply a photomask to the remaining area, expose it, and
After processing, etch unnecessary parts with hydrofluoric acid type liquid etc.
Flush away. Further, the transparent glass paste mentioned above is formed.
Mix powder of glass material with photosensitive photoresist
After applying it to the base glass, dry it and develop the resist.
It is also possible to perform etching with a liquid. Up
Photosensitive photoresist material used in the etching method described above
As a material, it is used when manufacturing conventional color cathode ray tubes.
Of polyvinyl alcohol and ammonium dichromate
In addition, various photoresists commonly used in the manufacture of semiconductor devices
Can be used. Already used when applying the phosphor
As you apply the medicine and expose it,
Therefore, there are some that are selectively sticky. There
It can be patterned by applying glass powder for filters.
After that, fix according to that method and remove impurities
The filter can be obtained by baking after heating. Next time
Refer to the drawings for the examples with bright optical filters
The effects will be explained in order, but the display device to which the
If the device is in color, red, blue, green, and 3 colors are a set.
This is the same as the present invention for reference, as it must be obtained.
Characteristics of the optical filter for blue color light filed in Japan (Fig. 2),
And also the characteristics of the optical filter for red light (Fig. 3)
The effect and effect of using three types of filters together
The result will be explained. First, the gas of the first embodiment to which the present invention is applied
Figure 4 (a) is a cross-sectional view of the structure of the discharge display panel.
A detailed plan view is shown in FIG. 4 (b).
The first of the matrix type gas discharge display panels shown in FIGS. 4 (a) and 4 (b)
In the configuration according to the embodiment, the front glass plate FG and the back surface are
The cell sheet CS is sandwiched between the glass sheet RG.
The cell sheet CS has a large number of spaces forming discharge cells.
It is formed by arranging the trix, and each discharge cell space
A display anode DA and a cathode C are provided before and after the
Gas discharge in the cell space between the display anode DA and the cathode C
UV light generated by this gas discharge
The fluorescent substance Ph is excited to emit light. The phosphor Ph
Is the emission color, red (R), and green for each discharge cell.
(G) and blue (B) are painted separately, therefore
Each discharge cell is called an R cell, a G cell, and a B cell, respectively.
The display device of this embodiment has the same structure as the conventional device.
To each discharge cell R, G, B by
Filters RF and G according to the present invention for selectively transmitting
As shown in the figure, F and BF cover the entire display side and the front
What is attached to the back surface of the glass plate FG is added. Each color filter RF, GF, BF described above
Are made of inorganic glass materials,
Example of high temperature heat treatment process to be applied when manufacturing a gas discharge display panel
For example, a panel glass heated at a fusion temperature of 430 ° C for 1 hour.
High temperature heat treatment in plate sealing process with frit glass
It is designed to withstand
Can be formed by printing splat
It Therefore, in the display device of this embodiment,
The color filter attached to the display side as described above is
When the colored light emitted from the display element is transmitted without loss,
Of the ambient light that enters the display element,
Avoid absorbing and reflecting color light of wavelengths other than the same region
It absorbs all but the transmitted light.
Must be absorption type, and the incident ambient light
It should not be scattered and reflected in the filter layer.
Therefore, it is necessary to have a so-called transparent layer. Therefore, a color filter having the above-mentioned characteristics is used.
If a filter is placed on the entire display side of each display element, each
Color light emitted from the inside of the discharge cell forming the display element, for example, G
Green light emitted from the cell passes through the G filter and
While it is taken out from the display surface without any loss,
Of these, the G component passes through the G filter and
G is reflected again by the white phosphor Ph that emits light and G
Almost unchanged from the display surface through the filter.
Although it is emitted, the B and R components are white inside the G cell.
Even if it is reflected by the phosphor Ph of
Since it is absorbed twice in a round trip, it will be significantly attenuated.
Therefore, the level difference between the G cell and the G component that should be emitted is significantly different.
Is generated, high control is possible even if ambient light is incident on the display surface.
Last display can be performed. Mode of such display
Is a B-cell with an associated B-filter and an R-filter
The same applies to the R cell with the
Is. In the configuration example shown in FIGS. 4 (a) and 4 (b),
Is made of black light absorbing material between each discharge cell.
Black lattice, that is, so-called black matrix BM
Is provided, and the reflectance of the display surface other than the light emitting area is
The color associated with each discharge cell
Further increase the high contrast by the effect of the filter
I am making it big. Next, each discharge cell configured as described above is
Le RC, GC, BC in the relative emission of the phosphor Ph
Example of the transmittance τ of Khuttle and each filter RF, GF, BF
Is shown in FIGS. 3, 1 and 2, but in the example shown,
Each primary color luminescent component is extracted to the outside with a transmittance of about 80%
On the other hand, the reflected light of the external light component other than each primary color is
Almost attenuated to O level. Therefore, each release
If the number of cells RC, GC, BC are equal,
The luminous reflectance of the entire display device is 0.8. ² × 1/3 or less (about 10%)
Is reduced by. FIG. 5 shows almost ideal characteristics and
Is not so good. The characteristics of the filter of the previous application
Comparing with the one this time, it becomes as shown in FIGS. Servant
Gray filter of the conventional method, the colored glass material of the previous application
The relative contrast between the case of using
Table 1 shows a comparison. Obvious from Table 1
As described above, when the color filter according to this embodiment is attached
There is only a slight decrease in the brightness of the discharge cell at
Even the contrast is the same as when the filter is not attached.
6 times, with a gray filter that does not have color selectivity
Compared to the case where it is added, it is improved four times or more. Figure
As is clear from FIGS. 1 to 3, the characteristics of the present invention are
It is stray and can be used well for monochrome display devices.
You can The structure is as shown in FIG.
However, only one color filter is used, as another example
It is also possible to use direct gas emission without using a phosphor.
Noh. Well-known examples are neon (red-orange), green and
Then there are krypton and blue as argon. [Table 1] In addition, the phosphor is all white and the filters are R, G, B
It is also possible to color in the conventional manner. That
At this time, it is necessary to increase the filter density to some extent. Warm
This can be achieved by increasing the degree or increasing the film thickness. Further, the above-mentioned first embodiment of the application will be described.
The mode of application will be described in detail.
The filter is a gas, as shown in FIGS. 4 (a) and 4 (b), for example.
Cover the entire display side of each discharge cell in the discharge display panel.
As described above, it is necessary to attach it to the back surface of the front glass plate.
It is a cage. Then, in the configuration example shown in FIGS. 4 (a) and 4 (b),
In addition, as described above, the front glass plate FG is attached to the back surface thereof.
Display side on each of the primary color filters RF, GF, BF
The electrodes are deposited or placed. This display side electrode deposition state
Is almost the same as that known in the past, and Ni, Au, Ag, Cu, Cu
-Al, Cr-Cu-Cr, etc.
Applied by coating, ion plating, plating, etc.
In addition, if necessary, etching is applied to the display side.
The electrodes and their leads are formed. In addition, such electrodes and
The fact that wires and conductors can be formed by arranging wires
It is like. Then, the deposition was performed as described above.
When firing the electrode material layer, form the electrode material layer
Each primary color formed by the metal as described above
It may diffuse into the filter and deteriorate its performance.
Since it is probably present, either apply a diffusion prevention layer between them or
As a pole material, a metal material that can be fired at a temperature as low as possible
Is preferably selected and used. Also,
Even when etching is used to form the electrodes, each primary color filter is used.
If the luter is made of a material that is easily attacked by etching
In advance, use a transparent etchant blocking layer to filter
-It is necessary to cover and protect the material layer. That etch
Liquid blocking layer is CaF ₂ , Ta ₂ O _Five Single tube color image pickup tube
Forming a color separation filter for the front plate of the
It is preferable to use materials. Note that the
In the body discharge display panel, except for the above
Of course, it can be done in the same manner as the conventionally known one. Next
In addition, the conventional display devices other than the gas discharge display panel
An embodiment when the invention is applied will be described. Application As a second embodiment, a cathode ray tube display device
To be referred to. Cathode ray tube display device, especially color cathode ray tube
By applying the present invention to a display device, a display surface of a color cathode ray tube
For the arrangement of each primary color filter described above in
The front plate of the glass sleeve that forms the
Also, a combination of phosphor dots of each color forming each primary color display element
The array pitch is at least the current gas discharge display panel
Since it is much smaller than
It is difficult to form this coating only by printing technology.
In the same way as the application formation of the phosphor dots, the filter material
Is preferably applied and etched. sand
That is, there is a primary color filter over the entire inner surface of the front plate.
Apply the above-mentioned colored glass material for coating thinly and evenly and dry
After half baking, apply photoresist all over.
Then, in the same way as when forming the phosphor dots, the shadow
A light source placed at the electron beam deflection point through the mask
It is exposed and etched, and its primary color filter is installed.
Leave only the colored glass material to be used. Of such colored glass material
Repeat the coating and etching process for each primary color
Also, regarding the black matrix, when forming the phosphor layer
After the same steps as above, firing is performed. After that,
Fluorescent material of each primary color is processed through the conventional phosphor layer formation process.
A transparent layer that covers the entire surface of the body dot and transmits each primary color light.
Place the absorption filter made of clear inorganic material.
It Next, as a third embodiment of application, a low-speed electron beam firefly is used.
Reference is made to an optical display panel. Mainly applied to low-speed electron beam phosphor display panel
When applying the light to the gas discharge panel described above.
First, on the back of the front glass plate,
A transparent conductive film is formed on each color glass filter.
On top of which fluorescent light for slow electron beam excitation was formed.
Apply the body to the required shape. Of the front glass plate of such a configuration
As usual, behind the grid electrode, electron beam source, etc.
To arrange. In addition to the display device of the type described above, the present invention
Also a light emitting element or a light control element, for example so-called E
Multiple types of display elements such as L, light emitting diode, liquid crystal
For the colors of the
Various display devices that are arranged side by side, for example, flat cathodes
Wide and easy to use for line tube display devices, character and graphic display devices, etc.
It is possible to obtain the same operational effect as described above by applying
Wear. As detailed above, the transparent inorganic material according to the present invention
The absorption type color filter consisting of
Uniformly or selectively on the front or back of the front plate.
With a filter of one color, in a multicolor display device, each
By arranging by color, covering the front of the display element,
Almost loss of display color light in various types of multicolor display devices
Without passing through, and unnecessary component color light in ambient light
Absorbs and significantly increases the contrast of the displayed color image.
It is possible to prevent the conventional ambient light reflection as described at the beginning.
The contrast increase method by
If used together, the effect of increasing contrast becomes more remarkable.
be able to. That is, a conventional color cathode ray tube display device
Similarly to the above, in the display device to which the present invention is applied,
Nd on the front glass plate ₂ O ₃ If you add rare earth elements such as
Color according to the present invention in a portion of the display device having low emission brightness
The effect of the filter can be increased. Further, the present invention is applied to a color cathode ray tube display device.
When applied, pigment is added to the phosphor of the color cathode ray tube.
It is mixed to absorb the color light in the wavelength range other than the display color light.
This further increases the effect of the color filter according to the present invention.
Can be made Still further, the color fill according to the present invention
If each display element is attached to each display element,
The average reflectance of can be reduced to 10% or less.
About 5% on the surface of the front glass plate
Is significantly more problematic than before. Therefore, the book
On the surface of the front glass plate in the surface device to which the invention is applied
Applying a low-reflection coating is extremely effective. Well
A low-reflection coating on the colored glass filter.
The reflection there decreases and the light output increases slightly.
To do. In addition, this low-reflection coating is used for the display device of the present invention.
It can also be performed in the final step of the manufacturing process
However, the color filter according to the present invention is provided on the back of the front glass plate.
Front glass plate is manufactured by applying and forming electrodes on the display side
At the stage when the process of
It is preferred to provide a low reflection coating as shown. In addition,
In that case, seal the front glass plate and the rear glass plate.
In the frit glass processing process such as for storing
Since it will be subjected to heat treatment, heating at this level
It is better to use a heat resistant coating material that can withstand heat treatment.
It is suitable. The present invention is provided on the front surface of the display device as described above.
Can be used as a glass filter, or to the glass surface
For displaying characters and figures, and for various shades and decorations
Available. It can also be used for various optical tools
It Use black glass paste on the single color filter
If you print the image overlaid, the image with a single halftone
Can be reproduced. Fixed image besides stained glass use
Used for display. A combination of three colors as a color filter
An explanation will be given by using the one used as an example. A relatively small area
The Luther matrix is set as shown in Fig. 6 (a), and the
Controls the transmittance (or reflectance) of the filter for midtones.
It's something to try to put out. The image source is a video signal of a television or the like.
Then, the signal is stored in the frame memory. That belief
No. at an appropriate speed to create an original plate for printing and
To the screen. At that time, follow the color arrangement in Fig. 6 (a).
, Sample the signal, and display the shading on the screen
Keep the displacement. The shade (displacement) is, for example, as shown in FIG.
It is controlled by the area of black glass-paste as shown in (b). This
When viewing a fixed image of with transmitted light, the filter color
If you want to increase the intensity and use the reflection type, reduce the concentration and
Try to put a highly reflective diffuser on top of the luther. This
The diffusing surface may be attached to glass. Also glass
Fig. 6 (b), directly or after attaching the diffusion surface to the substrate
Print and bake a black glass paste like
You may make it possible to display images by combining two sheets. Black moth
If you replace only the image of Russ, the color image will be changed accordingly.
The image also changes. This poster can be stored almost permanently
Therefore, it is also effective for highly artistic objects. Also, ultraviolet rays
It has durability in temperature and humidity, so it can be used outdoors, in public notices, etc.
It is valid. Examples 1 to 5 Transparent glass powder containing 6% or less of CuO, CoO, Cr ₂ O ₃ Green
A glass paste containing color pigments as shown in Table 2 is suitable.
Apply or attach to a glass substrate for baking and bake at 450-650 ° C.
By forming an inorganic optical filter for green light
Obtained. Spectroscopy of the green optical filters of Examples 1 to 5
The transmittance curves are shown in FIGS. The one shown in Fig. 11 is conventional.
Example (JP-A-59-36280, page 5, lower left column, last line to lower right column, first line)
11 shows the spectral transmittance curve of green glass paste (line 11). [Table 2] As shown in FIGS. 7 to 9, the green pigments 1 to
A glass powder paste containing 20% by weight was also used.
Is synergistic with the glass powder itself and the additive components of CuO 6% or less.
Due to the effect, of glass powder paste that does not contain pigment
Compared to the one shown in Figure 11, the green wavelength range (500-570 n
The difference between the spectral transmittance of (m) and the transmittance in the wavelength range other than green.
Is large, and the performance as a green filter is excellent.
It is shown that. As is apparent from the above description, the present invention
Inorganic optical filters are applied to various color display devices
The reflectivity of the display surface does not decrease the display brightness.
Can be significantly reduced, preventing reflection of ambient light and displaying
Significantly increase the contrast of the displayed image
Can maintain the required contrast
Reduce the display brightness and reduce the load on the display device.
be able to. Therefore, the luminous efficiency of the display device is high.
High-quality image display with high contrast even when there is no
Flickering is possible and low-luminance display is possible.
Since the sensitivity of interference is reduced, the low field of the displayed image
Periodic scanning becomes possible. In particular, the present invention provides a gas discharge display pattern.
Direct visible emission from the enclosed gas when applied to the channel
However, even if there is,
Since it is possible to absorb and remove luminescent components other than the light color,
It is possible to avoid a decrease in color purity. Therefore, subordinate
High brightness such as Ne which could not be used because of direct visible light emission
It is also possible to use a luminescent gas. The color filter according to the present invention
The material of construction of the filter should be at least in use.
Since it is only an inorganic material, the deterioration of characteristics due to light irradiation is small.
In addition, the color filter material is used for the gas discharge display panel.
Unnecessary gas, etc. even if it is enclosed in the gas space
Since almost no impurities are generated, the gas discharge indicator
There is no possibility of adversely affecting the life of the flannel, etc.
The remarkable effect of can be mentioned.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a transmittance characteristic curve of a green color optical filter of the present invention in comparison with a related characteristic curve. FIG. 2 is a diagram showing a transmission characteristic curve of the optical filter for blue color light of the present invention in comparison with a related characteristic curve. FIG. 3 is a diagram showing a transmittance characteristic curve of the optical filter for red color light of the present invention in comparison with a related characteristic curve. 4A and 4B are respectively a cross-sectional view and a plan view of a gas discharge display panel to which the present invention is applied. FIG. 5 is a diagram showing an idealized relationship between a phosphor emission spectrum of a color gas discharge display panel and a spectral transmittance of each color filter. FIG. 6 is a diagram for explaining an example in which the present invention is applied to fixed image display. FIG. 7: 97% by weight of transparent green glass containing 6% CuO and CoO.
FIG. 6 is a characteristic diagram showing a spectral transmittance curve of the green optical filter of the present invention when mixed with 3% by weight of a Cr ₂ O ₃ green pigment. FIG. 8: 90% by weight of transparent green glass containing 6% CuO and CoO.
Green glass containing 10% by weight of Cr ₂ O ₃ green pigment and 6% of CuO
FIG. 9 is a characteristic diagram showing a spectral transmittance curve of a green optical filter of the present invention when 85 wt% and a green pigment of 15 wt% are mixed. FIG. 9: 92% by weight of transparent green glass containing 3% CuO and CoO.
FIG. 3 is a characteristic diagram showing a spectral transmittance curve of a green optical filter of the present invention when mixed with 8% by weight of Cr ₂ O ₃ green pigment. FIG. 10: 90% by weight of transparent green glass containing 3% CoO and CoO
FIG. 5 is a characteristic diagram showing a spectral transmittance curve of a green optical filter of the present invention when mixed with 10% by weight of Cr ₂ O ₃ green pigment. FIG. 11 is a characteristic diagram showing a spectral transmittance curve of a green optical filter of a known example (JP-A-59-36280) when a glass paste containing 3% of K ₂ Cr ₂ O _{7 and} 3% of CoO is used. .

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[Procedure amendment] [Date of submission] April 26, 1993 [Procedure amendment 2] [Document name for amendment] Statement [Item name for amendment] Figure 4 [Method of amendment] Change [Content of amendment] [Figure 4] It is a figure showing a sectional view and a top view of a gas discharge display panel to which the present invention is applied.

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁵ Identification number Reference number within the agency FI Technical indication location H01J 9/20 A 7161-5E (72) Inventor Kokazu Moritsu Seiji Nishiji, Joto-ku, Osaka City, Osaka Prefecture 1-25 Okuno Pharmaceutical Industry Co., Ltd. 2nd factory (72) Inventor Tetsuo Sakai 1-10-11 Kinuta, Setagaya-ku, Tokyo Inside Japan Institute of Transport Technology

Claims (1)

[Claims] 1. 0.5 to 6% by weight of Cr ₂ O ₃ as a colored glass component, CoO
An inorganic material optical filter for green light, which is obtained by applying or adhering a transparent glass powder containing 0.5 to 6% by weight and 6% by weight or less of CuO on an applicable glass substrate and firing the glass material. 2. A transparent glass powder 80 to 99% by weight containing 6% by weight or less of CuO as a coloring glass component and a green pigment 20 to 1% by weight containing CoO, Cr ₂ O ₃ and Al ₂ O ₃ are applied. An inorganic material optical filter for green light, which is obtained by applying or adhering to a glass substrate and firing.