KR19990042412A - Method of Forming Fluorescent Film of Flat Panel Display Device - Google Patents

Abstract

The present invention relates to a method of forming a fluorescent film of a flat panel display device that can prevent mixing of each other by electrodepositing fluorescent films of different colors when forming a full color fluorescent film by using an electrodeposition method. The first step of forming the first transparent conductive film 29, the second transparent conductive film 30, the third transparent conductive film 32, the first transparent conductive film 29, the second transparent conductive film 30 and And a second step of coating the entire surface using a photosensitive polymer between the third transparent conductive films 32, and then drying and exposing and developing the non-conductive insulating films 20, and the first of the glass substrates 22. A third step of printing the electrodeposited anode 24 on the transparent conductive film 29 and applying a voltage by an electrodeposition method in the electrodeposition tank 36 having the fluorescent film electrodeposition liquid 28 to form a fluorescent film; After repeating step 3 to form respective fluorescent films on the second transparent conductive film 30 and the third transparent conductive film 32, The non-conductive insulating film 20 is characterized in that it is configured to be carried out in a fourth step process.

Description

Method of Forming Fluorescent Film of Flat Panel Display Device

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of forming a fluorescent film of a flat panel display device, and more particularly, to forming a full color fluorescent film using an electrodeposition method, which does not electrodeposit fluorescent films of different colors to prevent mixing of each other. It relates to a method for forming a fluorescent film.

In general, a flat panel display device has a similarity to a CRT in that electrons emitted from a cathode in a vacuum hit a fluorescent film of an anode and emit a fluorescent film.However, CRT emits a high voltage from an electron gun. On the other hand, the flat panel display device, unlike the CRT, forms an electric field in hundreds of thousands of cathodes and uses electrons to be emitted.

However, unlike a CRT of a flat panel display device, since there is no shadow mask or the like, the quality is influenced by the thickness of the fluorescent film and the uniformity of the fluorescent film. Although techniques have been researched and suggested, the effect of forming a compact fluorescent film by solving the thickness of the fluorescent film of the flat panel display and the uniformity of the fluorescent film has not been obtained.

Therefore, recently, the application of CRT to the production of the CRT has been announced since the 1950s, and the electrodeposition method, which has been applied to the painting of automobiles, is used.

The electrodeposition method has the advantage that the film thickness and the film concentration are not only uniform, but also the formation rate of the fluorescent film is fast, the thickness can be easily adjusted, and an irregular object can be coated.

The electrodeposition method means that the electrodeposition object is moved to the negative electrode or the positive electrode using a binder dissolved in the medium, and a binder insoluble in the medium is deposited by chemical reaction at the negative electrode or the positive electrode and coated with the electrodeposition object.

In recent years, as shown in FIG. 1, the fluorescent film was formed on the glass substrate 8 of the flat panel display element by using the above principle.

In the conventional fluorescent film electrodeposition method, the fluorescent film electrodeposition liquid 16 is placed inside the electrodeposition tank 4, and the transparent conductive film R 10 and the transparent conductive film G (12) are vertically long on the glass substrate 8. ) And the transparent conductive film B 14 are dipped in the fluorescent film electrodeposition liquid 16 of the electrodeposition tank 4.

When the cathode 2 is connected to the electrodeposition liquid 16, and the anode 6 is connected to the transparent conductive film R 10 to apply an electric current, the electrode 2 is mixed with the electrodeposition liquid 16 on the transparent conductive film R 10. The fluorescent film is electrodeposited.

By changing the electrodeposition liquid to the electrodeposition tank 4 in the same way as described above, the electrode is connected to the transparent conductive film G 12 by connecting only the electrodes, thereby applying a current, and forming a fluorescent film having a desired pattern on the transparent conductive film G 12. Subsequently, a fluorescent film can also be formed on the transparent conductive film B 14 by the same method as described above.

However, in the conventional fluorescent film forming method as described above, the transparent conductive film R (10), the transparent conductive film (G) 12, and the transparent conductive film (B 14) formed on the glass substrate (8) are formed lengthwise. After immersing in the electrodeposition liquid 16 to apply a current to the upper side to form a fluorescent film, the fluorescent film is electrodeposited on the transparent conductive film R 10 of the glass substrate 8, but the transparent conductive film G 12 is then processed. Is very fine between the pattern between the transparent conductive film R (10) and the transparent conductive film B (14) at the time of electrodeposition of the fluorescent film, i.e., a leakage current is generated at 10 to 150 占 퐉 and electrodeposited to the surrounding transparent conductive film, etc. There was a problem that the fluorescent film formed on the conductive film became mixed and the color became turbid.

In addition, in the electrodeposition method, the higher the voltage, the mixed color phenomenon is more prominent. This is because the specific gravity of the fluorescent film is high and the particle size is large.

Accordingly, the present invention has been made in view of the same problems as in the prior art, and an object thereof is to provide a method of forming a fluorescent film of a flat panel display device having a uniform thickness of the fluorescent film and preventing color mixing of the formed fluorescent film.

1 is a view showing a method for producing a conventional fluorescent film.

Fig. 2 is a diagram showing forming a fluorescent film of the flat panel display device of the present invention.

<Explanation of symbols for main parts of the drawings>

20: non-conductive insulating film 22: glass substrate

24: anode for electrodeposition 28: fluorescent film electrodeposition liquid

29: first transparent conductive film 30: second transparent conductive film

32: third transparent conductive film 36: electrodeposition tank

Therefore, in order to achieve the above object, the fluorescent film forming method of the flat panel display device of the present invention, the first step of forming a first transparent conductive film, a second transparent conductive film, and a third transparent conductive film on a glass substrate And a second step of coating the entire surface using a photosensitive polymer between the first transparent conductive film, the second transparent conductive film, and the third transparent conductive film, drying, exposing and developing the glass, and forming a non-conductive insulating film. The second transparent conductive film is repeated by repeating the third step and the third step of printing an electrode for electrodeposition on the first transparent conductive film of the substrate, applying a voltage by electrodeposition in an electrodeposition tank having a fluorescent film electrodeposition solution, and repeating the third step. And a fourth step of removing the non-conductive insulating film after forming each of the fluorescent films on the third transparent conductive film.

The fluorescent film forming method of the flat panel display device of the present invention configured as described above will be described in detail with reference to the accompanying drawings.

2 is a view showing a fluorescent film forming method of the flat panel display device of the present invention.

According to the present invention, an ITO layer is formed on the entire surface of the glass substrate 22 in the first step on the glass substrate 22, the photosensitive polymer is coated thereon, dried, and then exposed to light and developed by irradiation.

The photosensitive polymer is formed by etching the ITO layer exposed to the outside using the photosensitive polymer pattern to form the first transparent conductive layer 29, the second transparent conductive layer 30, and the third transparent conductive layer 32. Remove

In the process of the second step, the first transparent conductive film 29, the second transparent conductive film 30, and the third transparent conductive film 32 is coated on the entire surface using a photosensitive polymer, dried, and then exposed, It develops and the insulating film 20 is formed.

In the process of the third step, the electrodeposited anode 24 is printed on the first transparent conductive film 29 of the glass substrate 22, the voltage is applied to the anode 24, and the cathode 26 is a fluorescent film electrodeposition liquid ( A red fluorescent film is formed primarily in the electrodeposition tank 36 to be applied to the 28) side.

In order to form the green fluorescent film and the blue fluorescent film by repeating the process of the third step, the anode 24 is printed on each of the second transparent conductive film 30 and the third transparent conductive film 32, and a voltage is applied thereto. To form a fluorescent film.

As described above, since the insulating film 20 formed of the photosensitive polymer between the first transparent conductive film 29 and the second transparent conductive film 30 on the third transparent conductive film 32 is non-conductive, the first transparent conductive film 29 is red. When forming the fluorescent film, the leakage current is cut off so as not to be electrodeposited on the second transparent conductive film 30 formed next to the fluorescent film, and when the green fluorescent film is electrodeposited on the second transparent conductive film 30, the first transparency formed on the left and right sides. Since the non-conductive insulating film 20 blocks the leakage current between the front film 29 and the third transparent conductive film 32, the respective fluorescent films are not mixed.

After forming the three-color red, green, and blue fluorescent films as described above, in the fourth step, between the first transparent conductive film 29, the second transparent conductive film 30, and the third transparent conductive film 32, The formed nonconductive insulating film 20 is removed.

Therefore, the thickness of the fluorescent film formed on the glass substrate is uniform due to the method of forming the fluorescent film of the flat panel display device of the present invention, and the sharpness of the flat panel display device which can prevent color mixing of the formed fluorescent film is improved.

Claims (1)

In the fluorescent film forming method of the flat panel display device, A first step of forming the first transparent conductive film 29, the second transparent conductive film 30, and the third transparent conductive film 32 on the glass substrate 22, The first transparent conductive film 29, the second transparent conductive film 30, and the third transparent conductive film 32 are coated on the entire surface using a photosensitive polymer, dried, and then exposed and developed to form a nonconductive insulating film 20. Forming a second step) The electrodeposited anode 24 is printed on the first transparent conductive film 29 of the glass substrate 22, and a fluorescent film is applied by applying an electric voltage by the electrodeposition method in the electrodeposition tank 36 having the fluorescent film electrodeposition liquid 28. Forming a third step, After repeating the third step to form each of the fluorescent film on the second transparent conductive film 30 and the third transparent conductive film 32, a fourth step process of removing the non-conductive insulating film 20, characterized in that A method of forming a fluorescent film of a flat panel display device.