JPH0676738A - Fomation of color phoshor screen and color phosphor screen of field emission type dislay - Google Patents

Abstract

PURPOSE:To form a uniform phosphor screen without deteriorating the vacuum degree in a display by forming a fine-stripe phosphor at high precision without causing color mixing, to provide a high quality color phosphor screen. CONSTITUTION:A plurality of transparent electrodes corresponding to each color phosphor, are provided on the inner surface of a phosphor panel, and the phosphor is preferentially applied and formed on each of the transparent electrodes, to form a color phosphor screen. After a plurality of transparent electrodes 1 (1B, 1G, 1R) corresponding to each color phosphor are formed on the inner surface of a phosphor panel 10, zero voltage or reverse bias voltage to the electrode 1G on which the phosphor is applied, is impressed on the electrodes 1B, 1R, on which no phosphor is applied, in a water-soluble or water- insoluble electrodeposition liquid.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for forming a color phosphor screen of various displays and a field emission display FED (Fiel) using a field emission cathode as its electron source.
d Emission Display) color phosphor screen.

[0002]

2. Description of the Related Art Generally, as a method for forming a color phosphor screen in a color cathode ray tube, there are an electrodeposition method, a printing method and the like, but generally a slurry method is mainly used. In the slurry method, a phosphor slurry composed of a phosphor and a photosensitive binder is applied to the inner surface of the phosphor panel, dried, exposed through a color selection electrode, and developed to form a phosphor at a predetermined position. In the case of a color phosphor screen made of blue and red phosphors, the above-mentioned steps are repeated for each color.

However, in the case of this slurry method, it is difficult to form a fluorescent screen with high precision without gaps between the phosphors of each color, and an organic material is used as a binder, but this material is used. It cannot be completely removed only by burning in the firing process. For example, the above-mentioned FED
In the case of forming the color phosphor screen in (1), it is necessary to maintain the inside of the display in an ultra-high vacuum of about 10 ^-8 Torr, but in the slurry method, as described above, the phosphor causes the emission gas to generate a vacuum degree. It has the disadvantage of causing deterioration.

In the electrodeposition method, the phosphor to be coated is dispersed in a water-soluble or non-water-soluble electrodeposition liquid to positively or negatively charge the phosphor, and the electrodeposition liquid is subjected to electrodeposition. The transparent electrode on the body, that is, the inner surface of the panel, and its counter electrode are arranged so as to face each other, and when the phosphor is positively charged, the transparent electrode side is set to a negative potential and the counter electrode side is set to a positive potential (the phosphor is charged negatively). In this case, the fluorescent surface is formed to have a potential opposite to that of the above. For example, as proposed in Japanese Patent Publication No. Sho 60-11415 filed by the applicant of the present invention, green is formed on the stripe transparent electrode. In the case of a color phosphor screen including blue and red phosphors, the above steps can be repeated for each of green, blue and red.

However, in the case of this electrodeposition method, since the phosphors of respective colors are sequentially deposited by the electrodeposition method, color mixture of the phosphors is likely to occur, which may lead to a decrease in luminance and a deterioration in color purity. , 200μm or less, especially 100μ
If the stripe width is less than m, there is a drawback that the electrodeposition cannot be performed accurately.

On the other hand, in the printing method, a highly viscous liquid phosphor material composed of a phosphor and a vehicle (binding material) is screen-printed on a predetermined position on the inner surface of the panel, dried and baked to form a phosphor layer. In the case of a color phosphor screen composed of, for example, green, blue and red phosphors, the above-mentioned steps up to drying are repeated for each color of green, blue and red, and then firing is performed. .

However, even when this printing method is used, various problems described below occur. For example, since the fluorescent panel is slightly curved inward, a printing mask cannot be adhered to the inner surface of the panel, and it is difficult to form a narrow stripe electrode pattern with high accuracy. In addition, there is a possibility that an organic substance may remain in the phosphor after firing to impair the degree of vacuum, and in order to maintain an ultra-high vacuum inside the panel, a pillar having a height of about 300 μm for maintaining a space within the panel. Although it is necessary to form (rib), it is practically impossible to form a phosphor screen by this printing method after forming this rib because of the three-dimensional effect due to the height, and the phosphor screen of the FED described above is formed. It is difficult to apply it when manufacturing.

[0008]

DISCLOSURE OF THE INVENTION The present invention is a method of forming a color phosphor screen as described above, in which a so-called fine-stripe phosphor having a fine pitch is formed with high precision without causing color mixing to achieve high quality. A material that does not impair the degree of vacuum in the display so that a color phosphor screen can be obtained, and the ribs for holding the ultra-high vacuum in the FED are also affected by the three-dimensional effect. So that a uniform fluorescent screen can be obtained.

[0009]

The method of forming a color phosphor screen according to the present invention includes a plurality of transparent members corresponding to phosphors of respective colors on the inner surface of a phosphor panel, as shown in a schematic explanatory view of an example thereof. In a method of forming a color phosphor screen in which an electrode is formed and a phosphor is selectively formed on each transparent electrode, a plurality of transparent electrodes 1 (1B, 1B, 1B, 1G, 1R), and then, in the water-soluble or water-insoluble electrodeposition liquid 11, an electrode not coated with a phosphor,
In this case, 0 or an electrode to which this phosphor is adhered is applied to 1B and 1R with a reverse bias voltage to that of 1G in this case.

Further, in the present invention, in the above-mentioned method for forming a color phosphor screen, the transparent electrode 1 is formed into a stripe shape,
In addition, the width is set to 200 μm or less.

Further, according to the present invention, the fluorescent panel 10 has columns formed on its inner surface so as to withstand the high vacuum inside, and then the color fluorescent screen is formed by the above-described method of forming the color fluorescent screen.

The color phosphor screen of the field emission display of the present invention is formed by the above-described method for forming a color phosphor screen.

[0013]

As described above, according to the present invention, after the transparent electrode 1 is formed on the inner surface of the fluorescent panel 10, the phosphor is applied by any of the electrodeposition methods using the water-soluble or water-insoluble electrodeposition liquid. A new electrodeposition method of applying 0 or reverse bias voltage to the non-selective electrode is used. This makes it possible to reliably avoid the attachment of the fluorescent substance to the non-selective electrode due to electrophoresis, and thus it is highly accurate and uniform. Electrodeposition can be performed, and a fluorescent screen without color mixture can be formed. Further, at this time, the phosphor screen can be formed without using a phosphor made of an organic material, and a decrease in vacuum degree caused by the phosphor can be avoided.

Further, according to the present invention, a high resolution color display can be obtained by forming the transparent fluorescent electrode 1 into a stripe shape and setting the width thereof to 200 μm or less to form the color phosphor screen by the above-described forming method.

Further, according to the present invention, since the fluorescent panel 10 has columns formed on its inner surface so as to withstand the high vacuum in the fluorescent panel 10, the color fluorescent screen is formed by the above-described method of forming the color fluorescent screen. It is possible to avoid damage after the fluorescent screen is formed.

By producing the color phosphor screen of the field emission display of the present invention by the above-mentioned forming method, a high-resolution thin flat display can be obtained.

[0017]

EXAMPLE In this example, a case of forming a color phosphor screen of a field emission display FED will be described. F
The ED uses a so-called Spindt type field emission type microcathode, which has a small size of a cathode of about several μm or less, to extract electrons, and accelerates and irradiates the electrons on a phosphor to display light. It is a thin flat display device.

As shown in an exploded perspective view of one example in FIG. 2, in this FED, for example, R, G, B (red, blue,
Light transmissive property in which color phosphor screens 21 are formed by arranging the phosphor elements of the three primary colors (green) in stripes through transparent electrodes (not shown) made of ITO (mixed oxide of In and Sn) or the like. The fluorescent panel 2 and the rear panel 16 on which the electrode structure 15 having the field emission type cathode is formed are hermetically sealed by a sealing material or the like, and are held at a predetermined vacuum degree. Although not shown, each of the panels 10 and 16 is sealed by a column having a required height, so-called rib, in order to keep the interval constant.

As the electrode structure 15, strip-shaped cathode electrodes 17 extending in the direction indicated by the x-axis in FIG. 2 are arranged in parallel on the inner surface of the rear panel 16 in a stripe shape, and the insulating layer 18 is formed on the cathode electrodes 17. In the y-axis direction substantially orthogonal to the extension direction of the cathode electrode 17,
Similarly, band-shaped gate electrodes 19 are arranged in parallel in stripes.

Each cathode electrode 17 and gate electrode 1
R, G, and
For example, a plurality of cathode holes 11 having a predetermined opening width w are formed so as to correspond to the respective phosphor elements of the three primary colors shown by B, and the cathode holes 11 are provided on the cathode electrodes 17 in FIG. As shown in a schematic enlarged perspective view of a portion, a conical field emission type cathode 1
The electrode assembly 5 is formed by depositing 2 of the above. In FIG. 3, parts corresponding to those in FIG. 2 are designated by the same reference numerals, and duplicate description will be omitted.

In the present invention, after the stripe-shaped phosphor elements R, G, B are formed with a plurality of transparent electrodes 1 (1B, 1G, 1R) corresponding to each color phosphor as shown in FIG. , In the water-soluble or non-water-soluble electrodeposition liquid 11, the electrode to which the fluorescent substance is not applied, in this case 1B and 1R, 0 or the electrode to which the fluorescent substance is applied, in this case, a reverse bias voltage to 1G is applied. To do.

As a method of forming such a transparent electrode 1, for example, as shown in FIG. 4, stripe-shaped transparent electrodes 1 are sequentially deposited and formed, and then electrodes corresponding to the same color are commonly connected. be able to. That is, first ITO
After depositing a transparent conductive layer such as the whole surface, the whole surface is coated with a photoresist and exposed by a proximity exposure method, a contact exposure method or a stepper method using a stripe-shaped chrome mask pattern, etc., Through development, etching, and resist stripping steps, for example, stripe-shaped transparent electrodes 1 in which 1G, 1B, and 1R are sequentially formed corresponding to green, blue, and red are formed.

Tg, Tb, and Tr represent terminals led out corresponding to green, blue, and red, respectively, and one electrode of each transparent electrode 1 is formed to extend in comparison with other electrodes. Constitute. In this example, each terminal is derived from the left end in FIG. 4 for each trio of green, blue, and red, but the derivation position is not limited to this, and the interval is every two trios. Various modifications are possible. In this case, the width w of each electrode 1 is, for example, 50 μm, the distance d between the electrodes is, for example, 50 μm, and the interval L between the trios is, for example, 80 μm.

An insulating material frame 3 made of glass paste or the like extending in a direction (horizontal direction) orthogonal to the striped transparent electrode 1 is provided at one end thereof, for example, corresponding to the electrodes 1G, 1B, 1R of the respective colors. Then contact hole 2
A pattern in which G, 2B, and 2R are arranged in the horizontal direction is formed by patterning, drying, and baking by a printing method or the like. Such a pattern is shown in FIG.
As shown in A, contact holes 2G, 2B and 2R
It is possible to perform patterning by using, for example, a mesh-shaped mask 5 for an insulating material having a mask portion 6 at a position corresponding to.

Further thereon, a conductive substance 4 made of a conductive metal or carbon paste which extends in the horizontal direction, that is, in the direction orthogonal to the transparent electrode 1 is also shown in FIG. 5B by a printing method or the like. It can be formed by patterning, drying and firing using the stripe-shaped mask 7 for conductive material, thereby electrically connecting the transparent electrodes 1G, 1B and 1R corresponding to each color to the terminal T.
The terminal can be derived only by g, Tb, and Tr.

With such a configuration, it is possible to avoid an increase in the number of terminals when performing, for example, a high-quality character display having a relatively large number of pixels or a TV display having a pixel number of 640 × 480 or more, It is possible to secure the reliability of terminal withstand voltage and the reliability of fine pitch wiring.

Next, as shown in the enlarged schematic perspective view of FIG. 6, pillars 23, so-called ribs, are formed by a printing method or the like in the gap of each trio of stripes of three colors.
The pillars 23 have a diameter φ of 50 μm, for example, by being overprinted with an insulating glass paste or the like.
A plurality of stripes are formed at intervals of one trio with a height of approximately 300 μm, and a plurality of them are arranged at a predetermined interval.

The fluorescent panel 10 having the transparent electrode 1 thus formed is placed in an electrodeposition tank 9 into which an electrodeposition liquid 11 in which a fluorescent powder of a desired color is dispersed is poured, as shown in FIG. Then, the green, blue, and red phosphors are sequentially electrodeposited on the transparent electrode 1 corresponding to the color of the phosphor powder. Examples of the phosphor include ZnS: Cu, Al for green, ZnS: Ag, Cl for blue, and Y ₂ O ₂ S: E for red.
u, CdS, etc., and other colors such as ZnS: Mn,
Most semiconductors and insulators can be used for the electrodeposition method except for powders such as Y ₂ O ₃ : Eu and ZnO: Zn, which are easily eluted in a solvent. In FIG. 1, 8 is a counter electrode having a polarity opposite to that of the electrode 1 on the fluorescent panel at the time of electrodeposition, and 12 is an electrodeposition liquid 1
1 stirrer, 13A is a power supply for electrodeposition, 13B and 13C
Indicates a power supply for reverse bias application.

In such a structure, first, the panel 10
Is an electrodeposition liquid 11 in which green fluorescent powder is dispersed, such as aluminum nitrate, magnesium nitrate, lanthanum nitrate, sodium hydroxide, potassium hydroxide and thorium nitrate as an electrolyte in cathodic electrodeposition, glycerin as a dispersant, and a solvent. The electrodeposited solution 11 containing isopropyl alcohol, acetone, etc., was put in, and a negative potential (DC voltage) was applied to the first stripe-shaped transparent electrode 1G via the terminal Tg.
Other striped transparent electrodes 1B, 1R via b, Tr
0 or a positive potential (reverse bias voltage) is applied to the counter electrode 8 and a positive potential is applied to the counter electrode 8 to electrodeposit the green phosphor powder only on the electrode 1G to form a green phosphor film. After that, the panel 10 is washed with alcohol or the like to remove a very small amount of the fluorescent powder or the like adhering between the stripe-shaped transparent electrodes 1 and the above-mentioned pillars 23 due to a non-electrostatic action such as van der Waals force, and then hot air. dry.

Next, the blue fluorescent powder is dispersed to form an electrodeposition solution 11
This fluorescent panel 10 is put in the transparent electrode 1B corresponding to the blue color via the terminal 1, and the other transparent electrodes 1G and 1R have a negative potential or 0 or a positive potential (reverse bias potential), and the counter electrode 8
By applying a positive potential to the electrode 1B and electrodepositing only the blue fluorescent powder on the electrode 1B, it is possible to form the blue fluorescent film without any color mixture on the green fluorescent film. Also in this case, after washing with alcohol or the like, hot air drying is performed.

Further, the panel 10 is placed in an electrodeposition liquid 11 in which red fluorescent powder is dispersed, and a negative potential is applied to each transparent electrode 1R corresponding to red through the terminal Tr, and 0 or positive to the other transparent electrodes 1G and 1B. Potential (reverse bias potential), and further positive potential is applied to the counter electrode 8 to electrodeposit only the red fluorescent powder on the electrode 1R to form a red fluorescent film without any color mixture on the green fluorescent film and the blue fluorescent film described above. be able to. In this case as well, it is similarly washed with alcohol or the like and then dried with hot air.

In cathodic electrodeposition, H ₂ or the like is generated on the cathode side due to electrolysis of water or the like and an electrochemical reaction of the electrolyte (free ions) at the cathode, and the transparent electrode 1 made of ITO is reduced. Despite the drawbacks, it is possible to avoid this by pretreatment of the electrodeposition solution. That is, it is possible to avoid the whitening of the transparent electrode 1 by removing water, performing electrolytic treatment, removing electrolyte free ions, or exchanging the supernatant of the electrodeposition solution.

The coating film value of each phosphor can be controlled by the electrodeposition time, the electric field strength, the amount of phosphor, etc. For example, when the DC electric field of the electrodeposition power source is 50 V / cm, 15 μm is deposited. It can be done by electrodeposition for 30 seconds. The reverse bias potential is about 0 to 500 V, and the time required for cleaning alcohol or the like is about 30 seconds.

Further, in the above-mentioned example, an aqueous solution type cathodic electrodeposition is carried out. However, even when a non-aqueous solution type anodic electrodeposition of a ketone type electrodeposition solution containing nitrocellulose is carried out, the reverse bias is not applied. By applying to the select electrode,
As in the above-mentioned example, the phosphor can be applied with high accuracy while avoiding color mixture.

After the color fluorescent panel 10 thus formed is joined to the panel having the above-mentioned field emission type cathode described in FIG. 2 by a glass adhesive or the like while keeping the distance between them to about 300 μm. Then, the inside is evacuated to about 10 ⁻⁸ Torr to form a field emission display FED.

Then, the cathode 17 and the gate electrode 19 extending in two directions orthogonal to each other are selected and voltages are sequentially applied, and electrons are emitted from the field emission cathode 21 at the intersection 22 to emit fluorescence corresponding to each color. By making the body emit light, color image display corresponding to the signal can be performed.

As the color display method, there are a method of associating each cathode of the selected crossing portion 22 with a phosphor of one color and a so-called color selecting method of associating each cathode with a plurality of color phosphors. The color selection operation in this case will be described with reference to FIGS. 7 and 8.

In FIG. 7, a plurality of stripe-shaped transparent electrodes 1 on the inner surface of the fluorescent panel 10 extend in a direction orthogonal to FIG. 7, and as described above, R, corresponding to each color,
The G and B phosphors are sequentially arranged and formed, and the electrodes of each color are integrated into the terminals of Tr for red, Tg for green, and Tb for blue. As described above, the cathode electrodes 17 and the gate electrodes 19 are provided in a stripe shape so as to be orthogonal to each other on the rear panel 16 facing each other.
When an electric field intensity of 10 ⁸ to 10 ⁹ V / m is applied between the gate electrodes 19, electrons are emitted from the field emission type cathode (not shown) formed at the intersection 22 of each electrode. On the other hand, a voltage of 100 to 1000 V is applied between the transparent electrode 1, that is, between the anode electrode and the cathode electrode 17 to accelerate electrons,
Causes the phosphor to emit light. In the example of FIG. 7, the red phosphor R
It shows the case where a voltage is applied only to accelerating the electrons as indicated by arrow e.

As described above, color display can be performed by selecting each of the three-terminal RGB colors in time series. FIG. 8 shows a color selection timing chart in the NTSC system for a certain cathode, gate and anode (phosphor stripe) on each cathode electrode array. When each cathode electrode 17 is line-sequentially driven at a period of 1H, H / 3 of the period H for each color phosphor R, G, B
When a + hV signal is applied to each of the gate signals, and a gate signal and a cathode signal are applied in synchronization with + αV as a gate signal and −αV to −βV as a cathode signal in the H / 3 cycle, respectively, and when the gate-cathode voltage V _pp = + 2αV The electrons can be emitted to each of the R, G, and B phosphors of R, G, and B to emit light to perform color selection, and thus full-color display can be performed.

In the above example, the case of application to the FED has been described, but the present invention applies the color phosphor screen of various other displays, particularly the phosphor of 200 μm.
It goes without saying that the present invention can be applied to the case of forming a so-called fine stripe phosphor screen having a size of about m or less, and various changes can be made in the method of forming the same.

[0041]

As described above, according to the present invention, by applying 0 or a reverse bias to the non-selective electrode when the phosphor is formed by electrodeposition, it is possible to surely avoid the color mixture, and particularly fine Striped phosphors can be applied with high precision without color mixing, and a high-quality color phosphor screen can be easily obtained.

Furthermore, the fluorescent screen can be formed without using an organic material, and it is possible to maintain an ultrahigh vacuum in the display.

Also, when a pillar for supporting the fluorescent panel against the vacuum is formed on the inner surface of this panel, a uniform fluorescent film can be formed without being affected three-dimensionally.

Further, according to the present invention, the fine stripe phosphors can be applied with high precision without color mixing to obtain a color phosphor screen of a field emission display.

Furthermore, by collecting the terminals for each color during electrodeposition, the number of terminals can be reduced to the same number as the phosphor color, and in the case of fine stripe phosphors, the number of terminals can be particularly reduced. Thus, the mounting space can be expanded and the reliability of the connection with the external circuit can be improved.

Further, by providing RGB three terminals, color selection becomes easy and full color display can be performed.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of an example of a method of forming a color phosphor screen.

FIG. 2 is an exploded perspective view of an example of a field emission display.

FIG. 3 is a schematic linear enlarged perspective view of a main part of an example of a field emission display.

FIG. 4 is an explanatory diagram of an example of a method of forming a color phosphor screen.

FIG. 5 is an explanatory diagram of an example of a method of forming a color phosphor screen.

FIG. 6 is an enlarged schematic perspective view of an example of a color phosphor screen.

FIG. 7 is an explanatory diagram of color selection by switching RGB three terminals.

FIG. 8 is a diagram showing a timing chart of color selection.

[Explanation of symbols]

 1 Transparent Electrode 1G Transparent Electrode 1B Transparent Electrode 1R Transparent Electrode 8 Counter Electrode 9 Electrodeposition Tank 10 Fluorescent Panel 11 Electrodeposition Liquid

─────────────────────────────────────────────────── ───

[Procedure amendment]

[Submission date] October 14, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0003

[Correction method] Change

[Correction content]

However, in the case of this slurry method, it is difficult to form a fluorescent screen with high precision without gaps between the phosphors of each color, and an organic material is used as a binder, but this material is used. It cannot be completely removed only by burning in the firing process. For example, the above-mentioned FED
In the case of forming the color phosphor screen in (1), it is necessary to maintain the inside of the display in an ultra-high vacuum of about 10 ^-8 Torr .
There is a disadvantage that the degree of vacuum is deteriorated by the released gas .

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

However, even when this printing method is used, various problems described below occur. For example, in the printing method,
The printing mask cannot be brought into close contact with the inner surface of the panel, and it is difficult to form a narrow stripe electrode pattern with high accuracy. In addition, there is a possibility that an organic substance may remain in the phosphor after firing to impair the degree of vacuum, and in order to maintain an ultra-high vacuum inside the panel, a pillar having a height of about 300 μm for maintaining a space within the panel. Although it is necessary to form (rib), it is practically impossible to form a phosphor screen by this printing method after forming this rib because of the three-dimensional effect due to the height, and the phosphor screen of the FED described above is formed. It is difficult to apply it when manufacturing.

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction content]

[0013]

As described above, according to the present invention, after the transparent electrode 1 is formed on the inner surface of the fluorescent panel 10, the phosphor is applied by any of the electrodeposition methods using the water-soluble or water-insoluble electrodeposition liquid. A new electrodeposition method of applying 0 or reverse bias voltage to the non-selective electrode is used. This makes it possible to reliably avoid the attachment of the fluorescent substance to the non-selective electrode due to electrophoresis, and thus it is highly accurate and uniform. Electrodeposition can be performed, and a fluorescent screen without color mixture can be formed. Further, at this time, the phosphor screen can be formed without using the phosphor containing the organic binder, and the decrease of the vacuum degree due to the released gas can be avoided.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0020

[Correction method] Change

[Correction content]

Each cathode electrode 17 and gate electrode 1
R, G, and
For example, a plurality of cathode holes 20 having a predetermined opening width w are provided so as to correspond to the respective phosphor elements of the three primary colors shown by B, and the cathode holes 20 are respectively formed on the cathode electrodes 17 in the cathode holes 20 , for example, as shown in FIG. As shown in a schematic enlarged perspective view of a portion, a conical field emission type cathode 2
The electrode assembly 15 is formed by depositing 1 of the above. In FIG. 3, parts corresponding to those in FIG. 2 are designated by the same reference numerals, and duplicate description will be omitted.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Name of item to be corrected] 0029

[Correction method] Change

[Correction content]

In such a structure, first, the panel 10
Is an electrodeposition liquid 11 in which green fluorescent powder is dispersed, such as aluminum nitrate, magnesium nitrate, lanthanum nitrate, sodium hydroxide, potassium hydroxide and thorium nitrate as an electrolyte in cathodic electrodeposition, glycerin as a dispersant, and a solvent. Isopropyl alcohol, acetone ,
Put in electrodeposition liquid 11 containing amyl alcohol etc.
Negative potential (DC voltage) to the first striped transparent electrode 1G via, and 0 or positive potential (reverse bias voltage) to the other striped transparent electrodes 1B and 1R via terminals Tb and Tr.
Is applied and a positive potential is applied to the counter electrode 8 to electrodeposit green fluorescent powder only on the electrode 1G to form a green fluorescent film.
After that, the panel 10 is washed with alcohol or the like to remove a very small amount of the fluorescent powder or the like adhering between the stripe-shaped transparent electrodes 1 and the above-mentioned pillars 23 due to a non-electrostatic action such as van der Waals force, and then hot air. dry.

[Procedure correction 6]

[Document name to be amended] Statement

[Name of item to be corrected] 0032

[Correction method] Change

[Correction content]

In cathodic electrodeposition, H ₂ or the like is generated on the cathode side due to electrolysis of water or the like and an electrochemical reaction of the electrolyte (free ions) at the cathode, and the transparent electrode 1 made of ITO is reduced. Despite the drawbacks, it is possible to avoid this by pretreatment of the electrodeposition solution. That is, the transparent electrode 1 can be prevented from becoming opaque by removing water, performing electrolytic treatment, removing electrolyte free ions, or exchanging the supernatant of the electrodeposition solution.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0040

[Correction method] Change

[Correction content]

In the above example, the case of application to the FED has been described, but the present invention applies the color phosphor screen of various other displays, particularly the phosphor of 200 μm.
The present invention can be Rukoto applied to the case of forming a phosphor screen of a so-called fine stripes are much less m, also it is needless to say various modifications are possible as a method of forming.

[Procedure Amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0042

[Correction method] Change

[Correction content]

Furthermore, the phosphor screen can be formed without using an organic bonding material, and an ultrahigh vacuum in the display can be maintained.

[Procedure Amendment 9]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 6

[Correction method] Change

[Correction content]

[Figure 6]

Claims (4)

[Claims] 1. A method of forming a color phosphor screen, wherein a plurality of transparent electrodes corresponding to phosphors of respective colors are formed on an inner surface of a phosphor panel, and phosphors are selectively deposited on the respective transparent electrodes. After forming a plurality of transparent electrodes corresponding to the phosphors of each color on the inner surface of the fluorescent panel, in the water-soluble or non-water-soluble electrodeposition solution, the electrode not coated with the phosphor is coated with 0 or the phosphor. A method of forming a color phosphor screen, characterized in that a voltage having a reverse bias to that of the electrode to be applied is applied. 2. The method for forming a color phosphor screen according to claim 1, wherein the transparent electrode is stripe-shaped and the width thereof is 200 μm or less. 3. The color phosphor screen according to claim 1, wherein columns are formed on an inner surface of the phosphor panel so that the phosphor panel withstands a high vacuum in the phosphor panel, and then the color phosphor screen is formed. Method of forming color phosphor screen. 4. A color phosphor screen of a field emission display, wherein the color phosphor screen is formed by the method for forming a color phosphor screen according to claim 1.