JP2919039B2 - Color display - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a color display device, and more particularly to a gas discharge type color display device incorporating color filters having different thicknesses.

(Prior Art) Conventionally, a color display device, for example, a gas discharge type device, provided with a color filter for the purpose of improving display characteristics such as increasing a contrast ratio has been proposed. FIG. 7 schematically shows an example of a configuration of a gas discharge type display device provided with a color filter.

The display device shown in FIG. 7 has a plurality of gas discharge type color display elements 10 with a discharge gas 16 between a front plate 12 and a back plate 14.
And a color filter 18 on an optical path for extracting light from the color display element 10 as external display light.
Is provided. The color display element 10 has an anode portion 20a and a cathode portion 22a which are opposed to each other to form a gas discharge.
And a fluorescent pair that generates light extracted as external display light
24, for example, arranged in a matrix. The color display element 10 generates, for example, red, blue or green light, and the color filter 18 selectively transmits light of the color generated by the associated color display element 10. In the figure, a display element 10 for generating red, blue or green light and a filter for transmitting the same are shown.
18 are denoted by reference symbols R, G or B, respectively.

On the front plate 12, a color filter 18 is provided at a position corresponding to the color display element 10, and a red color filter 18 is formed by coloring the front plate 12, for example, a glass substrate by an ion exchange coloring technique, The green and blue color filters 18 are formed by a thick-film printing technique using a transparent glass paste for inorganic green and blue. As these ion exchange coloring techniques and inorganic materials, for example, those disclosed in Reference I: JP-A-59-36280 are used.

Industrially, it is advantageous to form all the color filters 18 using a thick film printing method suitable for mass production. Color filter 18
Although two kinds of materials, organic and inorganic, have been developed as thick film printing materials, a high-temperature heat treatment of about 400 to 500 ° C. is performed in a post-process performed on the front plate 12 after the formation of the color filter 18. In the case where an organic material is used, it is difficult to form a color filter 18 having desired filter characteristics by burning and changing the quality of the organic material due to high-temperature heat treatment. Therefore, an inorganic material is used as a material for forming the filter. However, the inorganic materials that have been developed to date to form the red color filter 18 cannot form a red filter 18 that can practically sufficiently cut off light other than red light, and have blue and green light transmission characteristics. As a result, the red light transmission characteristic is extremely deteriorated, and the chromaticity of the color display element 10 varies. Therefore, in order to eliminate variation in characteristics, a red color filter 18 is formed by ion exchange coloring technology, and a red color filter 18 that can sufficiently cut light other than red in practical use.
To form

Further, a transparent filter protective layer 28 is provided on the color filter 18, and a plurality of striped anodes are provided in parallel on the protective layer 28. Then, the conductive phosphor 24 is used as a color filter.
It is arranged on the position corresponding to 18 and provided on the anode.

On the other hand, a plurality of stripe-shaped cathodes 22 are provided in parallel on the back plate 14, and the electrode formation of the front plate 12 and the back plate 14 is made such that the stripe-shaped cathodes 22 and anodes are orthogonal to each other when viewed in a plane. Face each other, and in this state,
Seal the 14 edges. A barrier rib 26 is interposed between the front plate 12 and the rear plate 14 to keep the distance between the cathode and the anode constant, and the barrier lip 26 is arranged in a stripe shape between the adjacent anodes, and an error between the adjacent anodes is formed. Prevent discharge.

A gas filling region is formed between the sealed front plate 12 and back plate 14, and discharge gas 16 is filled in the gas filling region.

(Problems to be Solved by the Invention) However, as described above, in order to eliminate variations in the light transmission characteristics of the color filters, a red color filter is formed by an ion exchange coloring technique, and blue and green color filters are printed in a thick film. When formed by technology, the thickness of the red filter is as thin as about 1 μm or less, while the thickness of the blue and green filters is as thick as about 3 to 15 μm, which causes a large step between these color filters. At the step, the distance between the cathode and the anode is widened, causing some variation in discharge characteristics. Further, when the anode and the phosphor are formed, the yield is reduced due to the disconnection of the anode or the printing of the phosphor. In order to eliminate this step, the thickness of the filter protective layer may be increased. However, when the layer thickness is increased, the light transmittance of the filter protective layer is reduced, and the thickness of the filter protective layer does not cause disconnection or print dripping. There has been a problem that it takes time and cost to laminate the filter protective layer up to this point.

SUMMARY OF THE INVENTION An object of the present invention is to provide a color display device in which steps between color filters are eliminated in order to solve the above-mentioned conventional problems.

(Means for Solving the Problems) In order to achieve this object, a color display device according to the present invention includes a color display element that emits a plurality of different types of color lights and a corresponding light transmitted from the color display element. A color filter, a front plate provided with the color filter on the surface at a position corresponding to each color display, and a rear plate having a color display element and a color filter interposed with the front plate. A discharge gas is sealed between the front plate and the back plate. Further, the color display element includes a first electrode and a second electrode which are opposed to each other to perform a gas discharge using the discharge gas. In the above-described color display device, a dummy layer is provided on a color filter having a low height to a height similar to that of a color filter having a high height. In addition, the shortest distance between the surfaces of the first and second electrodes is constant.

(Operation) According to such a structure, when the upper surface positions of the color filters are not aligned in the height direction due to the filter forming method and other factors, and thus a large step is generated between the color filters having different heights, the height is increased. A dummy layer is provided on a color filter having a low height to a height similar to that of a color filter having a high height.

Therefore, the upper surface position of the high-color filter and the dummy layer in the height direction is substantially the same position, and a step in the height direction between the color filters having different heights can be eliminated.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The drawings are only schematically shown to the extent that the present invention can be understood.

First Embodiment FIG. 1 is a sectional view schematically showing a configuration of a main part of a first embodiment of the present invention. In the drawing, the same reference numerals are used for the same components as those of the display device shown in FIG. The detailed description is omitted.

The display device of this embodiment is a transmission type DC gas discharge display device, a color display element 10 that emits a plurality of different types of color light, and a color filter 18 that transmits light from the corresponding color display element 10, Color filters 18 for each color display element 10
And an underlayer provided at a position corresponding to.

In this embodiment, the front plate 12 is made of inorganic glass,
A red filter 18 (R) composed of a colored portion formed by partially coloring the front plate 12 by an ion exchange technique, and a high color filter 18 are placed on the front plate 12. Green filter 18 made of thick film material printed on
(G) and the blue filter 18 (B).

Then, the dummy layer 30 is provided on the color filter 18 (R) having a low height to the same height as the color filters 18 (B) and 18 (G) having the high height. And the high color filter 18
(B), 18 (G) and a transparent filter protection layer 28 are provided on the dummy layer 30, and the cathode 22 is provided on the filter protection layer 28.
The dummy layer 30 is a substantially transparent inorganic glass layer.

Next, the manufacturing process of the display device of the first embodiment will be described.

A glass substrate is prepared as the front plate 12, and the front plate 12
A red filter 18 (R) is formed at a position corresponding to the red phosphor 24 (R). In this embodiment, a thick paste of copper stain paste is printed at a position where the red filter 18 (R) is to be formed in a predetermined pattern, and the printed paste is applied to the red filter 18 (R).
C. and dried at 580.degree. C. for 10 minutes, after which the residue produced by the calcination is removed by washing with water. By baking the above-mentioned paste, tin ions and silver ions adsorbed on the glass substrate are replaced to color the glass substrate, and a red filter 18 composed of the colored portion is used.
(R) is obtained. The thickness of the red filter 18 (R) is 1μ
m or less, and the thickness of the red filter 18 (R) is substantially not present.

Next, the green and blue phosphors 24 (G) of the front plate 12 and
A green filter 18 (G) and a blue filter 18 (B) are formed at positions corresponding to 24 (B). In this example, Co
O, Al ₂ O ₃ pigment containing glass paste with blue filter
A thick film is printed in a predetermined shape at the formation position of 18 (B), and the printed paste is dried at 150 ° C. for 1 hour, and then a glass paste containing chromium and cobalt is filtered with a green filter.
A thick film is printed in a predetermined shape at the formation position of 18 (G), the printed paste is dried at 150 ° C. for 1 hour, and then the dried blue and green filter thick film paste is dried at 580 ° C. for 1 hour.
Blue filter 18 baked for 0 minutes and made of thick film material
(B) and a green filter 18 (G).

Next, a dummy layer 30 is formed on the red filter 18 (R). In this embodiment, a thick film paste of a transparent glass thick film # ND-307 manufactured by NFL is printed in a predetermined pattern shape. This printing allows the transparent glass paste to
(B) Alternatively, the transparent glass paste is laminated until the height is substantially the same as that of the green filter 18 (G). The printed paste is then dried at 150 ° C for 1 hour and then at 460 ° C for 10 hours.
Dummy layer consisting of colorless transparent glass thick film baked for a minute
Get 30.

Due to the dummy layer 30, a step (10) in the height direction between the color filter 18 (R) and the color filters 18 (G) and 18 (B) is formed.
(A gap of about 15 μm) is eliminated.

Next, a transparent filter protection layer 28 is formed on the dummy layer 30 and the color filters 18 (G) and 18 (B). In this example
A transparent glass paste # ND-307 manufactured by NFL is printed so as to cover at least the entire area where the color filters 18 (R), 18 (G) and 18 (B) are formed, and the printed paste is a dummy layer.
Drying and baking are performed in the same manner as in the case of 30 to obtain a filter protection layer 28 made of a colorless transparent glass thick film.

Due to the presence of the dummy layer 30, the filter protective layer has a flat surface.
28 can be easily formed.

Next, a plurality of stripe-shaped anodes are formed in parallel on the filter protection layer 28 as a first electrode. In this embodiment, a transparent conductive film, for example, ITO (Indium Tin Oxide) is applied to the filter protective layer 28 by a thin film forming technique such as vapor deposition or sputtering.
Then, the transparent conductive film is patterned into a predetermined shape by photolithography and etching techniques to obtain an anode made of a stripe-shaped transparent conductive film. In addition, for anode formation
The sheet resistance of the ITO film was about 10 to 20 Ω / □.

Next, a phosphor 24 is formed on the anode (anode portion 20a) at a position corresponding to the color display element 10. In this example,
The red, blue, and green phosphor powders are, for example, # KX504A, # KX501A, and # P1G1 manufactured by Kasei Optonix, and 5 g of indium oxide and 25 g of Okuno Pharmaceutical Screen Paste # 6009 for 10 g of the phosphor powder. A mixed phosphor thick film paste is formed, and after printing, the paste is dried at 150 ° C. for 1 hour and then baked at 460 ° C. for 10 minutes to obtain a phosphor 24 composed of a thick film material.

In this embodiment, the phosphor 24 having conductivity is formed, but the phosphor 24 having no conductivity may be formed. Anode part when phosphor 24 does not have conductivity
The phosphor 24 is formed so that the whole of 20a is not covered with the phosphor 24 and a part thereof is exposed, so that the phosphor 24 does not prevent generation of gas discharge. When the phosphor 24 has conductivity, the anode portion 20a may be entirely covered or may be partially exposed.

On the other hand, a glass substrate is prepared as the back plate 14, and a plurality of striped cathodes 22 are formed on the back plate 14 in parallel as the second electrode. In this example, a DuPont Ni thick film paste # 9535 was printed in a print pattern of a predetermined shape, the printed paste was dried at 150 ° C. for 1 hour, and then dried at 580 ° C.
It is baked at 10 ° C. for 10 minutes to obtain a cathode 22 made of a Ni thick film.

Next, a barrier rib 26 is formed on the cathode 22. In this embodiment, DuPont glass thick film paste # 9741 is printed in a printing pattern of a predetermined shape, and the printed paste is dried at 150 ° C. for 1 hour. When the paste is laminated to a predetermined height by repeating printing and drying, the paste is fired at 530 ° C. for 10 minutes to obtain a barrier rib 26 made of a glass thick film laminated to a predetermined height.

Next, the electrode-forming surfaces of the front plate 12 and the back plate 14 face each other so that the striped cathode 22 and the anode are orthogonal to each other when viewed in a plane. A lead glass paste is applied, and the applied paste is baked at 460 ° C. for 20 minutes while evacuating the gas filled area, and the front plate and the back plate 14 are sealed with the lead glass.
As the lead glass paste, a paste formed by mixing 1 g of ethyl cellulose and 19 g of isoamyl acetate with 260 g of Iwaki Glass powder glass # IWF-7575B was used.

Next, while heating the sealed front plate 12 and back plate 14, the gas filled region between the front plate 12 and back plate 14 is evacuated to a vacuum degree of about 10 ^-5 to 10 ^-6 Torr. When it reaches, the discharge gas 48 is sealed in the gas sealing area, and the gas discharge type display device is completed. In this first embodiment, a second electrode (ie, cathode 22) is on the back plate, and a first electrode (ie, anode 20a) is interposed between the second electrode and the color filter.

In the embodiment described above, the phosphor 24 may be provided only on the upper surface of the anode, or may be provided over the entire display cell. In addition, the barrier rib 26
Instead of being laminated on the side of 14, it may be laminated on the side of the front plate 12.

The dummy layer 30 may be an inorganic glass layer suitable for the purpose of the filter, and the filter protection layer 28 may be a red, magenta or yellow color filter made of a thick film material, for example. It should be noted that, in the current technology, there is no inorganic filter that can sufficiently cut off light other than red light for practical use, so the filter formed of the dummy layer 30 is merely an auxiliary filter.

The material for forming the filter protection layer 28 is SiO ₂ , CaF ₂ , Ta
_The filter protection layer 28 may be formed by using ₂ O ₅ , Y ₂ O _3, or other materials, and laminating these materials by a thin film forming technique such as vapor deposition or sputtering.

A variety of conductors can be used for the anode. For example, the anode may be a single-layer electrode made of Ni, Fe, Cr, Cu, Au, Ag or other single material, or a Ni alloy, Fe alloy Alternatively, the electrode may be a single-layer electrode made of another alloy, or may be a multi-layer electrode made of a plurality of single materials or a plurality of alloy layers. In order to efficiently extract light from the color display element 10, the anode is made of, for example, tin oxide (NE
Advantageously, it is a transparent electrode made of SA) or indium tin oxide (ITO).

Second Embodiment FIG. 2 is a sectional view schematically showing a configuration of a main part of a second embodiment of the present invention. In the following description, the same components as those of the first embodiment will be denoted by the same reference numerals, and detailed description of the same points as those of the first embodiment will be omitted.

The display device of the second embodiment is a reflection type DC gas discharge display device.

In the second embodiment, red is provided on one of the substrate surfaces of the front plate 12,
Green and blue color filters 18 (R), 18 (G) and 18 (B)
Is provided. A black mask 32 is provided in a region other than the filter forming region of the display region on the one substrate surface, and a dummy layer 30 is provided on the red color filter 18 (R).

In this embodiment, the color filters 18 (G) and 18 (B), the dummy layer 30 and the black mask 32 are provided without providing the filter protection layer 28.
A plurality of striped cathodes 22 are provided in parallel as a first electrode. Therefore, the dummy layer 30 and the black mask
Both are provided to the same height as the color filters 18 (G) and 18 (B). Also, color filters 18 (G), 18 (B),
A gap is not formed between adjacent ones of the dummy layer 30 and the black mask 32, or even if a gap is formed, the gap is small enough not to cause disconnection of the cathode 22, or a color filter 18 is formed. (G), 18 (B), the green portion of the dummy layer 30 and the green portion of the black mask 32 overlap each other. By appropriately setting the thicknesses of the color filters 18 (G) and 18 (B), the dummy layer 30 and the black mask 32, the step when superimposed is reduced to such an extent that the cathode 22 does not cut off. be able to.

At a predetermined position on one substrate surface of the back plate 14, a striped anode 20 and a striped auxiliary anode 34 as a second electrode are provided in parallel with each other.
Is covered with an anode overcoat 34, and the phosphor 24 is provided on the overcord 34. Further, a window p is formed by partially cutting out the anode overcoat 34 and the phosphor 24 in a region where the anode 20 and the cathode 22 face each other.
Expose 20. Similarly, a window q is formed by partially cutting out the anode overcoat 34 in a region where the auxiliary anode 36 and the cathode 22 face each other, and the auxiliary anode 36 is exposed through the window q.

A barrier rib 26 is provided between the front plate 12 and the rear plate 14. A plurality of stripe-shaped barrier ribs 26 are arranged in parallel, and the anode 22 or the auxiliary anode 36 is disposed between adjacent barrier ribs 26.
Place. The barrier rib 26 adjacent to the auxiliary anode 36 is provided with a notch r for supplying atoms and ions excited by the pilot discharge by the auxiliary anode 36 to the color display element 10. In this second embodiment, the second electrode (ie, anode 20)
On the back plate, and a first electrode (ie, cathode 22) is interposed between the second electrode and the color filter.

Third Embodiment FIG. 3 is a sectional view schematically showing a configuration of a main part of a third embodiment of the present invention. In the following description, the same components as those in the above-described embodiment are denoted by the same reference numerals, and detailed description of the same points in the above-described embodiment is omitted.

The display device of the third embodiment is a reflective AC gas discharge display device.

In the third embodiment, the color filters 18 (G) and 18 (B), the dummy layer 30 and the black mask 32 are provided without providing the filter protection layer 28.
On the upper surface, stripe-shaped discharge sustaining electrodes 38 and 39 are provided in parallel. The discharge sustaining electrode 38 as the first electrode is an X electrode and the discharge sustaining electrode 39 is a Y electrode, and a pair of discharge sustaining electrodes 38 and 39 are provided for each color display element.

Then, the discharge sustaining electrodes 38 and 39 are covered with a dielectric layer 40,
The dielectric layer 40 is covered with the emitter 42. The emitter 42 is for reducing the discharge starting voltage, and is made of, for example, MgO.

Further, on one substrate surface of the back plate 14, a writing electrode 44 as a second electrode is provided in each color display element forming region, and the writing electrode 44 is covered with a dielectric layer 46. Then, the phosphors 24 are arranged in the respective color display element forming areas, and the dielectric layers 46 are formed.
Provided above. A window p is formed by partially cutting out the phosphor 24, and the dielectric layer 46 in the color display element forming region is exposed through the window p.

Further, a stripe-shaped or lattice-shaped barrier rib 26 is provided between the front plate 12 and the rear plate 14, and the discharge sustaining electrodes 38 and 39 and the writing electrode 44 are arranged between the adjacent barrier ribs 26.

The color display element 48 of the display device according to the third embodiment includes discharge sustaining electrodes 38 and 39, a writing electrode 44, and dielectric layers 40 and 46.
Of each color display forming area 38a, 39a, 44
a, 40a and 46a, and the phosphor 24.

In this embodiment, the portion 44a of the writing electrode 44 is orthogonal to the discharge maintaining electrodes 38 and 39. In the third embodiment, the second electrode (ie, the writing electrode 44) is on the back plate, and the first electrode (ie, the sustaining electrode 38,
39) is interposed between the second electrode and the color filter.

Fourth Embodiment FIG. 4 is an exploded perspective view schematically showing a configuration of a main part of a fourth embodiment of the present invention. In FIG. 4, these electrode forming surfaces are sealed without sealing a front plate and a back plate. The figure shows a state in which they are opposed to each other, and omits hidden lines which complicate the drawing and hinder the understanding of the drawing. In the following description, the same components as those of the above-described embodiment are denoted by the same reference numerals, and detailed description of the same points as those of the above-described embodiment will be omitted.

The display device of the fourth embodiment is a transmission (transmission phosphor screen) type AC gas discharge display device.

In the fourth embodiment, the color filters 18 (R), 18 (G) and
18 (B) is arranged in the color display element forming area and the front panel 12
And a dummy layer 30 is provided on the red color filter 18 (R). Further, a black mask 32 is provided in a region excluding the color display element formation region. Then, without providing the filter protection layer 28, the phosphor 24 is disposed in the color display element forming region, and the color filters 18 (G), 18 (R) and the dummy layer 30 are formed.
Provided on each of the. In the figure, the black mask 32 is higher than the color filters 18 (G), 18 (B) and the dummy layer 30. However, when the phosphor 24 is formed by thick film printing, the phosphor printing surface is flattened. In order to improve the printing accuracy, the black mask 32 is preferably provided at the same height as the color filters 18 (G), 18 (B) and the dummy layer 30. Also barrier rib
26 are provided on the black mask 32 so as to form a grid-like wall surrounding four sides of each color display element.

Further, on one substrate surface of the back plate 14, stripe-shaped discharge sustaining electrodes 38 and 39 are provided in parallel as second electrodes, and portions 38a and 39a of the color display element forming regions of these electrodes 38 and 39 are provided. Are projected in a direction to reduce the distance between the electrodes. A dielectric layer 40 and an emitter 42 are sequentially provided on the discharge sustaining electrodes 38 and 39.

On the emitter 42, a separator 50 is provided. The separator 50 extends in a stripe shape in a direction orthogonal to the extending direction of the discharge sustaining electrodes 38 and 39, and separates the separator 50 between adjacent color display elements in the extending direction of the discharge maintaining electrodes 38 and 39. The discharge spaces of these adjacent color display elements are separated from each other.

As a first electrode, a stripe-shaped writing electrode (also referred to as an address electrode) 44 is arranged along the direction in which the separator 50 extends and provided on one side of the separator 50.

The color display element of the display device of the fourth embodiment includes discharge sustaining electrodes 38, 39, a writing electrode 44, and portions 38a, 39a, 44a, and 40a of the respective color display forming regions of the dielectric layer 40.
And a phosphor 24. In the fourth embodiment, the second electrode (ie, the sustaining electrodes 38, 39) is on the back plate, and the first electrode (ie, the writing electrode 44) is located between the second electrode and the color filter. Intervened.

Fifth Embodiment FIGS. 5 and 6 are a perspective view and a sectional view schematically showing a main part of a fifth embodiment of the present invention. In these figures, the front plate and the back plate are not sealed. FIG. 5 shows a state in which these electrode forming surfaces are opposed to each other, and FIG. 5 omits hidden lines which complicate the drawing and hinder the understanding of the drawing. In the following description, the same components as those of the above-described embodiment are denoted by the same reference numerals, and detailed description of the same points as those of the above-described embodiment will be omitted.

The display device of the fifth embodiment is another example of the reflection type AC gas discharge display device.

In the fifth embodiment, a color filter 18 (R) and a black mask 32 are provided on one substrate surface of the front plate 12. On the substrate surface provided with these 18 (R) and 32, stripe-shaped sustaining electrodes 38 and 39 are provided in parallel as a first electrode, and bus electrodes are respectively provided on the sustaining electrodes 38 and 39. 52 and 54 are provided.

The dielectric layer is replaced by the color filters 18 (G), 18 (B) or the dummy layer 30. These color filters 18
When laminating (G) and 18 (B) to a proper thickness as a dielectric layer, the content of the color pigment contained in the filter forming paste is adjusted according to the thickness of the lamination, and an appropriate coloring density is obtained. Is preferably formed. At present, the layer thickness of the normally formed color filter and the appropriate thickness desired for the dielectric layer substantially match.

The black mask 32 and the electrodes 38, 39, 52, 54 are covered with the dummy layer 30, the filters 18 (G) and 18 (B). The dummy layer 30 and the color filters 18 (G) and 18 (B) are covered with an emitter 42, and a grid-like barrier rib is formed on the emitter 42.
26 will be provided.

Preferably, the dummy layer 30, the filters 18 (G) and 18
In (B), a gap is not formed between adjacent ones, or even if a gap is formed, the barrier rib 26 is made small enough not to impair printing accuracy when printing. Although the filter protection layer 28 is not provided in the illustrated example, the barrier rib 26
In order to improve the printing accuracy, the dummy layer 30 and the filter 18
A filter protection layer 26 may be provided between (G) and 18 (B) and the emitter 42.

Further, on one substrate surface of the back plate 14, the phosphor 24 is provided in the color display element forming region, and the
Are provided in a stripe shape in a direction perpendicular to the extending direction of the discharge maintaining electrodes 38 and 39, and the discharge spaces of the adjacent color display elements in the extending direction of the discharge maintaining electrodes 38 and 39 are separated by the separator 50. . Then, as a second electrode, a writing electrode (also referred to as an address electrode) 44 is provided between the adjacent separators 50 so as to extend in a stripe shape along the separators 50.

The color display element of the display device of the fifth embodiment includes discharge sustaining electrodes 38 and 39, a writing electrode 44, and portions 38a, 39a, 44a, and 1 of the respective color display forming regions of the dielectric layers 18 and 30.
8a and 30a, and the phosphor 24. In the fifth embodiment, the second electrode (ie, the writing electrode 44) is on the back plate, and the first electrode (ie, the sustaining electrodes 38, 3).
9) is on the front panel.

Transparent electrodes are used for the discharge maintaining electrodes 38, 39, and the electrodes 38, 39
It is preferable that the 39 bus lines be low-resistance wires, for example, an electrode having a three-layer structure in which a Cr layer, a Cu layer, and a Cr layer are sequentially laminated. If the barrier ribs 26 and the separator 50 cannot be formed high, the front plate 12 and the back plate 14 are formed in order to obtain a desired discharge space.
Any suitable spacer may be interposed between them to keep the distance between these substrates at about 100 μm.

When general MgO is used as a material for forming the emitter 42, it is said that a Ne-Xe-based gas is more advantageous as a discharge gas than a He-Xe-based gas in terms of device life. When Ne is included in the discharge gas, orange direct visible light emission is generated by the discharge.However, by cutting the orange direct visible light emission using a filter, the color purity when using the discharge gas containing Ne is reduced. Thus, the color reproduction range can be widened.

The present invention is not limited to the above-described embodiments, and accordingly, the configuration, shape, arrangement position, number of arrangement, numerical conditions, forming material, and others of each component can be arbitrarily and suitably changed. .

In addition to applying the present invention to a gas discharge type display device, the present invention may be applied to a fluorescent display tube (VFD) or a cathode ray tube (CRT).

(Effects of the Invention) As is apparent from the above description, according to the color display device of the present invention, for example, when the green and blue color filters and the red color filter are formed by the thick film printing method and the ion exchange technique. For example, when the upper surface positions of the color filters are not aligned in the height direction due to the filter forming method or other factors, resulting in a large step between the color filters having different heights, the height is higher on the color filter having a lower height. A dummy layer is provided up to the same height as the color filter.

Therefore, the upper surface position of the high-color filter and the dummy layer in the height direction is substantially the same position, and a step in the height direction between the color filters having different heights can be eliminated.

As a result, it is possible to avoid disconnection of, for example, an electrode or the like formed on the color filter, and reduction in printing accuracy of, for example, a barrier rib formed on the color filter. Also, variations in the discharge characteristics are reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view schematically showing a main part of a first embodiment of the present invention, FIG. 2 is a cross-sectional view schematically showing a main part of a second embodiment of the present invention, and FIG. FIG. 4 is a sectional view schematically showing a main part of a third embodiment of the present invention. FIG. 4 is a perspective view schematically showing a main part of a fourth embodiment of the present invention. FIG. FIG. 6 is a perspective view schematically showing a main part configuration of a fifth embodiment, FIG. 6 is a sectional view schematically showing a main part configuration of a fifth embodiment of the present invention, and FIG. 7 is a main part configuration of a conventional display device. It is sectional drawing which shows schematically. 10, 48 color display element 12 front panel, 14 rear panel 16 discharge gas, 18 color filter 20 anode, 22 cathode 24 phosphor, 26, barrier rib 28 … Filter protective layer 30… Dummy layer 32… Black mask 34… Auxiliary anode 38… Discharge maintaining electrode (X electrode) 39… Discharge maintaining electrode (Y electrode) 40, 46… Dielectric Layer 42 Emitter 44 Writing electrode (address electrode) 50 Separator.

────────────────────────────────────────────────── ─── Continued on the front page (72) Yoshimichi Takano 1-10-11 Kinuta, Setagaya-ku, Tokyo Japan Broadcasting Corporation Research Institute (72) Inventor Yoshitaka Terao 1-7-1 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd. (72) Inventor Ichiro Koiwa 1-7-12 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd. (72) Hiromi Kobayashi 1-7-112, Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd. (72) Inventor Kensuke Sasaki 1-7-112 Toranomon, Minato-ku, Tokyo Oki Electric Industry Co., Ltd. (72) Inventor Masatoshi Wada 4-chome, Doshumachi, Chuo-ku, Osaka-shi, Osaka No. 10 Okuno Pharmaceutical Co., Ltd. (56) References JP-A-59-36280 (JP, A) JP-A-2-47604 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB G02B 5/20- 5/28 H01J 17/00-17/64 G09F 9/00

Claims (11)

(57) [Claims] 1. A color display element that emits a plurality of different types of color light, a color filter that transmits light from the corresponding color display element, and the color filter provided on a surface corresponding to each color display. A front plate, and a back plate interposing the color display element and the color filter together with the front plate, wherein a discharge gas is sealed between the front plate and the back plate; An element is a color display device comprising a first electrode and a second electrode opposed to each other for performing gas discharge using the discharge gas, wherein a color filter having a high height is provided on a color filter having a low height. A color display device, wherein a dummy layer is provided to approximately the same height, and a shortest distance between a surface of the first electrode and a surface of the second electrode is constant. 2. The color display device according to claim 1, wherein said color display element is a gas discharge type color display element. 3. The color filter having a low height is a red filter including a colored portion formed by partially coloring the base by an ion exchange technique, and the color filter having a high height is provided on the base. 2. The color display device according to claim 1, wherein a green filter and a blue filter made of a printed thick film material are used. 4. The color display device according to claim 1, wherein said dummy layer is an inorganic glass layer. 5. The color display device according to claim 1, wherein said dummy layer is a transparent layer. 6. The color display device according to claim 1, wherein said dummy layer is a color filter made of a thick film material. 7. The color display device according to claim 1, wherein a transparent filter protective layer is provided on the high color filter and the dummy layer. 8. The color display device according to claim 1, wherein one of the first electrode and the second electrode is used as an anode, and the other electrode is used as a cathode. 9. The collar according to claim 1, wherein one of the first electrode and the second electrode is used as a discharge maintaining electrode, and the other electrode is used as a writing electrode. Display device. 10. The method according to claim 1, wherein the second electrode is on the back plate, and the first electrode is interposed between the second electrode and the color filter. Color display device. 11. The color display device according to claim 1, wherein said second electrode is on said back plate, and said first electrode is on said front plate.