JP2001283730A - Foil for transcription, cathode-ray tube and transcribing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a foil for transcription, a cathode-ray tube and a transcribing method that can integrally make a phosphor layer and an electrode layer in the same process to give a simplified manufacturing process for preserving an evenness of a membrane property of the electrode layer or the like along with avoiding such problems as a resistance value or the like from fluctuating. SOLUTION: On a film for transcription 201, are formed a foil for transcription with a five-layered structure composed of a separation layer 202, a phosphor layer 104, a backside reflecting layer 103, a backside electrode layer 102 and an adhesion layer 203, by a screen printing or the like. These composites of the backside electrode layer 102, the backside reflecting layer 103 and the phosphor layer 104 are integrally transcribed onto the backside plate 101 by taking advantage of the separation layer 202.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a transfer foil, a cathode ray tube, and a transfer method used for manufacturing a cathode ray tube such as a flat-type cathode-ray tube which emits a phosphor by an electron beam and thereby displays image information.

[0002]

2. Description of the Related Art In recent years, wall-mounted televisions having a small depth dimension have attracted attention in the market, and flat cathode ray tubes, liquid crystal flat displays, plasma displays, and the like have been actively developed. In particular, a reflective flat CRT is known for its low manufacturing cost and good image quality. In this type of flat cathode ray tube, a back electrode is provided on a back plate provided at a position facing the front panel. The back electrode has a phosphor layer formed on an electrode layer. That is, in this cathode ray tube, electrons generated from the cathode are converged into a beam, accelerated toward the electrode, and collide with the phosphor layer. As a result, the phosphor layer emits light, and the emitted color is projected as image information through the front panel.

Conventionally, as a method of manufacturing such a flat cathode-ray tube, the same applicant as the present applicant discloses a technique of forming a reflection layer (inorganic material layer) and a phosphor layer on a panel by using a transfer method. (Japanese Patent Application Laid-Open No. 11-96948).

[0004]

However, in this flat-type cathode-ray tube, the transparent electrode layer made of ITO (Indium-Tin Oxide) is separately formed by coating, and therefore has the following problems. Was. First, the reflective layer (T
In addition to the step of transferring the iO ₂ ) and the phosphor layer, a separate coating step of the transparent electrode layer is required, which requires a large-scale manufacturing apparatus. Secondly, in the process of forming the transparent electrode layer, there is a possibility that the resistance value may vary due to uneven coating. In order to avoid this, if the coating is attempted to be applied uniformly, if the coating thickness is large, it becomes cloudy due to the influence of moisture, etc. Is gone. On the other hand, when the coating thickness is small, there is a problem that the resistance becomes high and the conduction cannot be sufficiently obtained. In addition, when the coating thickness is increased to some extent, there is a management problem such as drying immediately after coating.

[0005] The present invention has been made in view of the above problems, and a first object of the present invention is to form at least a phosphor layer and an electrode layer at the same time and to simplify the manufacturing process. It is another object of the present invention to provide a transfer foil and a transfer method that can ensure uniformity of the film quality of an electrode layer and the like and do not cause a problem such as a variation in resistance value. A second object of the present invention is to provide a cathode ray tube manufactured by using the transfer method and the transfer method.

[0006]

The transfer foil according to the present invention comprises:
At least one of a release layer, a phosphor layer, an electrode layer, and an adhesive layer is formed on one surface of the transfer substrate.
Further, the cathode ray tube according to the present invention has a laminated structure including at least an electrode layer and a phosphor layer at a predetermined position of a second panel disposed to face the first panel with an adhesive layer therebetween. Are formed by transfer. Further, the transfer method according to the present invention, the transfer layer, at least a release layer, a phosphor layer, an electrode layer and an adhesive layer are laminated to form a transfer foil, then the electrode layer side of the transfer foil by the adhesive layer. Along with bonding to a second panel disposed opposite to the first panel,
By peeling the transfer substrate using the peeling function of the peeling layer, at least the electrode layer and the phosphor layer are transferred.

In the transfer foil of the present invention, at least a release layer, a phosphor layer, an electrode layer and an adhesive layer are formed on a transfer substrate by lamination, and the transfer including the electrode layer is collectively transferred to a cathode ray tube panel or the like. And an electrode layer having a uniform film quality can be formed.

[0008]

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

FIG. 1 shows a structure in the vicinity of a back electrode of a flat cathode-ray tube according to an embodiment of the present invention. FIG. 2 is a front view of the back electrode 100 shown in FIG.

As shown in FIG. 1, the back electrode 100 is
It is attached to another panel facing the plate-shaped front panel 110. The front panel 110 is formed of, for example, transparent glass. Below the front panel 110 and the back electrode 100, a square cone 120 made of glass having, for example, a square opening surface is attached. Although not shown, the square cone 120 is provided with an electron gun for generating an electron beam, a deflection coil for deflecting the electron beam, and the like. Further, a conductive film 121 is formed on the inner surface of the square cone 120.
Reference numeral 21 is electrically connected to a voltage application terminal (not shown) for applying a voltage to the back electrode layer 102 described later.

The back electrode 100 is connected to a front panel 110.
Back plate 101 made of, for example, glass and curved to face
And a transparent back electrode layer 102 is formed on a surface of the back plate 101 facing the front panel 110.
The back electrode layer 102 is adhered to the entire surface of the back plate 101 facing the front panel 110 by an adhesive layer (not shown), and is connected to the above-described voltage application terminal via the conductive film 121 of the square cone 120. It is electrically connected.
In the upper region on the back electrode layer 102, a back reflection layer 103 and a phosphor layer 104 are formed by lamination corresponding to the effective screen. The phosphor layer 104 emits light when irradiated with an electron beam, and an observer observes video information through the front panel 110. At this time, 10 to 20% of the light emission amount is transmitted to the back side and the brightness on the front side is reduced.
3 reflects the transmitted light and improves the brightness on the front panel side.

It is preferable that the resistance value of the back electrode layer 102 be as small as possible in order to prevent poor start-up and charge-up. Note that the rising failure means that when the resistance value of the back electrode layer 102 is high, the instantaneous time difference of the current flowing through the back electrode layer 102 increases, and the instantaneous time difference occurs in the light emitted from the phosphor layer 104. This is a phenomenon that appears as an image time difference. Charge-up means that when the resistance value of the back electrode layer 102 is high, the back electrode layer 102
Is a phenomenon in which a current flowing through the back electrode 100 remains on the back electrode 100, and the remaining charges cause discharge. From such a thing,
The back electrode 100 is formed such that the resistance value of the back electrode layer 102 is 100 MΩ or less.

In the flat cathode-ray tube employing the back electrode 100, a positive voltage of 5 to 10 KV is applied to the back electrode layer 102 via the voltage application terminal and the conductive film 121. An electron beam generated from an electron gun (not shown) accelerates across the opening surface of the rectangular cone 120 toward the back electrode layer 102 of the back electrode 100 and collides with the phosphor layer 104. As a result, the phosphor layer 104 emits light, and the emitted color is reflected by the back reflection layer 103, and then is observed as image information via the front panel 110.

Next, a method for manufacturing (transferring) the back electrode 100 will be specifically described with reference to FIGS. 3 (A) and 3 (B).

First, as shown in FIG. 3A, a transfer film substrate 201 made of, for example, PET (polyethylene terephthalate) has a peeling function at a predetermined temperature and is vaporized at a temperature higher than the peeling temperature. A release layer 202 having a function, for example, made of an acrylic resin is formed by screen printing to a thickness of, for example, about 6 to 10 μm. This acrylic resin has about 20
It exfoliates at a temperature of 0 ° C and vaporizes at a temperature of about 300 ° C.

Next, the phosphor layer 1 is formed on the release layer 202.
04 is formed by screen printing. The phosphor layer 104 contains 20 particles (for example, 4.5 μm or less in particle diameter) such as Y ₂ O ₂ S (sulfite yttrium oxide).
A layer is formed with a thickness of about 30 μm. Further, on this phosphor layer 104, a back reflection layer 103 made of a high refractive index material such as titanium oxide (TiO ₂ ), tin oxide (SnO ₂ ), aluminum oxide (Al ₂ O ₃ ), for example, 5 to 20 is formed.
It is formed by screen printing to a thickness of about μm.

Next, a back electrode layer 102 having a thickness of, for example, about 3 to 20 μm is formed by screen printing so as to cover the back reflection layer 103 and the phosphor layer 104. The material of the back electrode layer 102 is, for example, ITO
(Indium-Tin Oxide) or other fine particles (eg, 1 μm particle size)
Below), a transparent material having a resistance value of 100 MΩ or less after firing is used. Depending on the use of the cathode ray tube, a material such as carbon or chromium oxide which becomes blackish gray after firing and whose resistance value is 100 MΩ or less after firing can be used. Further, an adhesive layer 20 made of, for example, a butyral resin or a polyamide resin is formed on the back electrode layer 102.
3 is formed by screen printing. After the screen printing is performed to form the layers, the layers are air-dried or dried by a dryer or the like to stabilize the thickness of each layer.

Next, as shown in FIG. 3 (B), the transfer foil thus formed is
It is adhered to a predetermined position on a back plate 101 disposed opposite to a front panel (not shown). Then, back plate 1
01 is heated to a temperature (for example, about 200 ° C.) at which the transfer film 201 is peeled off, and the transfer film 201 is peeled off.
By heating to 0 ° C., the release layer 202 is also vaporized and removed. Further, the adhesive layer 203 is heated and vaporized, and the vaporized components are exhausted and removed. After such a transfer step, the back electrode layer 102 and the back reflection layer 10
3 and the back electrode 100 including the phosphor layer 104 can be formed.

As described above, in the present embodiment, in the step before the transfer step, the release layer 20 is formed on the transfer film 201.
2. Phosphor layer 104, back reflection layer 103, back electrode layer 1
A transfer foil having a five-layer structure composed of the adhesive layer 02 and the adhesive layer 203 is formed by screen printing. Then, the back electrode layer 102, the back reflection layer 103, and the phosphor layer 104 are collectively transferred by using the release layer 202.
Therefore, the production equipment does not need to be large,
In addition, since the application step is unnecessary, uniformity of the film quality is ensured, and problems such as unevenness of the resistance value due to uneven application are eliminated.

In this embodiment, the release layer 106, the phosphor layer 104, the back reflection layer 103, and the back electrode layer 102 are formed on the transfer film 105 by screen printing. The back electrode layer 102, the back reflection layer 103, and the phosphor layer 104 can be formed at precise positions with respect to the back plate 220, and the back electrode 100 can be manufactured more easily and accurately.

In this embodiment, the back electrode layer 10
2. The back reflection layer 103, the phosphor layer 104, and the like are formed by screen printing. However, it is not necessary to perform all screen printing.
It may be formed using VD (chemical vapor deposition), sputtering, or the like.

[0022]

As described above, according to the transfer foil or the transfer method of the present invention, at least the release layer, the phosphor layer and the electrode layer are formed on the transfer substrate by lamination. As a result, batch transfer to a panel or the like of the cathode ray tube becomes possible, and uniformity of the film quality of the electrode layer and the like is secured. Therefore, the number of working steps can be simplified, and the occurrence of a defective rate and the occurrence of printing displacement and sagging between printing layers can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating a structure near a back electrode of a flat cathode-ray tube according to an embodiment of the present invention.

FIG. 2 is a front view of a back electrode shown in FIG.

FIG. 3 is a cross-sectional view for explaining a manufacturing process of the back electrode shown in FIG.

[Explanation of symbols]

100: back electrode, 101: back plate, 102: back electrode layer, 103: back reflection layer, 104: phosphor layer, 201:
Transfer film, 202: release layer, 203: adhesive layer, 1
10 Front panel

Claims (12)

[Claims] At least a release layer is provided on one surface of a transfer substrate.
A transfer foil, wherein a phosphor layer, an electrode layer and an adhesive layer are formed by lamination. 2. The transfer foil according to claim 1, further comprising a reflection layer. 3. A second panel disposed opposite to the first panel.
A cathode ray tube, wherein a laminated structure comprising at least an electrode layer and a phosphor layer is transferred and formed at a predetermined position of the panel with an adhesive layer therebetween. 4. The cathode ray tube according to claim 3, further comprising a reflection layer. 5. After a transfer foil is formed by laminating at least a release layer, a phosphor layer, an electrode layer and an adhesive layer on a transfer substrate, the electrode layer side of the transfer foil is attached to the first panel by the adhesive layer. And at least the electrode layer and the phosphor layer are transferred by adhering the transfer substrate to the second panel disposed opposite to the substrate and by using the separation function of the separation layer. Transfer method. 6. The method according to claim 5, wherein the electrode layer is formed by screen printing using a printing paste.
The transfer method as described above. 7. The transfer method according to claim 6, wherein the printing paste is baked after the transfer foil is adhered to the second panel. 8. The electrode layer is made of ITO (Indium-Tin Oxid
The transfer method according to claim 7, wherein the transfer method is formed by e). 9. The resistance value of the electrode layer after firing is 100.
The transfer method according to claim 7, wherein the transfer resistance is set to MΩ or less. 10. The transfer method according to claim 5, wherein a butyral resin or a polyamide resin is used as a material of the adhesive layer. 11. The transfer foil according to claim 5, wherein the transfer foil is further formed by laminating a reflective layer.
The transfer method as described above. 12. The transfer method according to claim 5, wherein said reflection layer is formed of at least one of titanium oxide, tin oxide and aluminum oxide.