Title of Invention	"A DEVICE AND METHOD FOR OPTIMIZING FUEL CONSUMPTION AND REDUCING CARBON DIOXIDE EXAHUST EMISSION IN AN INTTERNAL COMBUSTION ENGINE"
Abstract	The present invention is to improve color purity and brightness of a color Braun tube by constructing the fluorescent film of the red fluorescencer as a laminated structure. The present invention relates to a structure of a fluorescent film for a color Braun tube wherein the fluorescent film of the red fluorescencer comprises fluorescencer layers having a laminate structure made of two different compositions of Y2O2S : Eu and Y203 : Eu.

Title of Invention

"A DEVICE AND METHOD FOR OPTIMIZING FUEL CONSUMPTION AND REDUCING CARBON DIOXIDE EXAHUST EMISSION IN AN INTTERNAL COMBUSTION ENGINE"

Abstract

The present invention is to improve color purity and brightness of a color Braun tube by constructing the fluorescent film of the red fluorescencer as a laminated structure. The present invention relates to a structure of a fluorescent film for a color Braun tube wherein the fluorescent film of the red fluorescencer comprises fluorescencer layers having a laminate structure made of two different compositions of Y2O2S : Eu and Y203 : Eu.

Full Text	FIELD OF THE,INVENTION The present invention relates to a fluorescent film structure of a color Braun tube. More specifically, the present invention relates to a fluorescent film structure in which two or more multilayer fluorescencers are constructed on a fluorescent film of a red fluorescencer, to enhance the white radiation brightness. BACKGROUND OF THE INVENTION Three-color fluorescencers are used in a color Braun tube, a fluorescent lamp, a projection type cathode-ray tube, or the like. A color Braun tube generally comprises as its essential component a fluorescent screen subsequently coated with three-color (green, blue, red) fluorescencers which radiates by an electronic ray on an inner surface of a panel with a whole surface of glass. The process for manufacturing such a fluorescent screen is Inrqely divided into a coating of light-absorbing black material \i.^i) [FIG. I] and a coating of three-color f luorescencer phosphor (PH) [FIG. 2] . As illustrated in FIG. 1, the process of coating of light-absorbing BM comprises washing and drying panel (1) and then injecting and coating a photoresist thereto; light-exposing and developing by the use of a mask which defines the portion to which three primary color fluorescent materials should be formed, to form a photoresist mask; coating graphite; and etching, developing and drying the said photoresist mask to form a graphite band (2) having a thickness of about 5-10 urn. Subsequently, as illustrated in FIG. 2, the panel to which a BM has been formed is washed, and then coated with a precoat and dried. A mixture of a green fluorescencer, photosensitizer, polyvinyl alcohol, light cross-linker and dispersing agent is coated thereto, dried, light-exposed and developed to- form a green fluorescent film (3) . Then a blue fluorescent film (4) and a red fluorescent film (5) are formed by the same procedure. Then, an emulsion film is formed and Al-deposited. i In the three color fluorescent films, the green fluorescencer comprises ZnS : Cu/Al, ZnS : Au,Al, [(Zn,Cd)S : Cu,Al] etc.; the blue fluorescencer comprises ZnS : Ag, ZnS : Ag,Al, etc., and the red fluorescencer comprises Y202S : Eu, Y203 : Eu, etc. These three color fluorescencers should have good radiation color purity as three primary color light, and high radiation efficiency to the electronic ray stimulating energy, i.e., high radiating brightness. At present, same colored pigment as the radiation color is adhered onto the surface of the fluorescencer core in order to improve the radiation color purity and contrast of the screen. Though such a pigment-adhered fluorescencer is advantageous for the FIG. 3 is a structural view of a conventional fluorescent film. FIG. 4 is structural view of a fluorescent film according to the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT As shown in FIG. 4, illustrating the structure of the fluorescent film according to the present invention, the fluorescent film of the present invention is different from the conventional fluorescent film [FIG. 3] in that the former comprises multi-layer structure of the red fluorescent film. On the inner surface of a face plate of panel (1) to which BM has been formed, a green fluorescent film (3) and a blue fluorescent film is formed, and the red fluorescent film comprises the first red fluorescencer layer (6) and the second red fluorescencer layer (7). In the above-mentioned structure, the multi-layer fluorescent film is prepared by injecting a composition for the first red fluorescencer layer (6) comprising Y202S : Eu adhered with a pigment by rotary coating method, drying and light-exposing thereof (the layer is not developed); injecting a composition for the second red fluorescencer layer (7) comprising Y203 : Eu which is not adhered with a pigment, drying, light-exposing and developing thereof; and coating with acrylic emulsion. STATEMENT OF INVENTION This invention relates to a structure of a fluorescent film for a color Braun tube comprising: fluorescent films with three color fluorescencers of green, blue and red, wherein the fluorescent film of the red fluorescencer comprises fluorescencer layers having a laminate structure made of at least two different composition as herein described. Though, in the example of the present invention, the first fluorescencer layer comprises Y202S : Eu, and the second layer comprises Y203 : Eu, the composition of each layer can be exchanged, and each layer is not limited to a composition. According to the present invention, a fluorescent film having high radiation efficiency without lowering overall color purity, by passing the light radiated from the second fluorescencer layer (7) having excellent radiation efficiency through the first fluorescencer layer (6) having excellent color purity. As described above, according to the present invention, a red fluorescent film is formed to overcome the inherent disadvantages of fluorescencers, and the characteristics of laminated fluorescencers having different compositions are complemented each other, to obtain a fluorescent film having improved color purity, brightness, and so on. It provides an excellent fluorescent screen of a fluorescent lamp or a projection type cathode-ray tube as well as a color Braun tube. We claim 1. A structure of a fluorescent film for a color Braun tube comprising: fluorescent films with three color fiuorescencers of green, blue and red, wherein the fluorescent film of the red fluorescencer comprises fluorescencer layers having a laminate structure made of at least two different composition as herein described. 2. A structure of a fluorescent film for a color Braun tube as claimed in claim 1, wherein the fluorescent film of the red fluorescencer comprises a film of Y2O2S : Eu and Y203 : Eu. 3. A structure of a fluorescent film for a color Braun tube as claimed in claim 2, wherein the film thickness of the said Y2O2S : Eu is 10 - 50 % of the said Y2O3 : Eu. 4. A structure of a fluorescent film for a color Braun tube as claimed in claim 2, wherein a first red fluorescencer film comprising Y2O2S : Eu and a second red fluorescencer film comprising Y2O3 : Eu have been subsequently laminated. 5. A structure of a fluorescent film for a color Braun tube as herein substantially described and illustrated in accompanying drawings with reference to Figure 4.

Full Text

FIELD OF THE,INVENTION
The present invention relates to a fluorescent film structure of a color Braun tube. More specifically, the present invention relates to a fluorescent film structure in which two or more multilayer fluorescencers are constructed on a fluorescent film of a red fluorescencer, to enhance the white radiation brightness.
BACKGROUND OF THE INVENTION
Three-color fluorescencers are used in a color Braun tube, a fluorescent lamp, a projection type cathode-ray tube, or the like. A color Braun tube generally comprises as its essential component a fluorescent screen subsequently coated with three-color (green, blue, red) fluorescencers which radiates by an electronic ray on an inner surface of a panel with a whole surface of glass.
The process for manufacturing such a fluorescent screen is Inrqely divided into a coating of light-absorbing black material \i.^i) [FIG. I] and a coating of three-color f luorescencer phosphor (PH) [FIG. 2] .
As illustrated in FIG. 1, the process of coating of light-absorbing BM comprises washing and drying panel (1) and then injecting and coating a photoresist thereto; light-exposing and
developing by the use of a mask which defines the portion to which three primary color fluorescent materials should be formed, to form a photoresist mask; coating graphite; and etching, developing and drying the said photoresist mask to form a graphite band (2) having a thickness of about 5-10 urn.
Subsequently, as illustrated in FIG. 2, the panel to which a BM has been formed is washed, and then coated with a precoat and dried. A mixture of a green fluorescencer, photosensitizer, polyvinyl alcohol, light cross-linker and dispersing agent is coated thereto, dried, light-exposed and developed to- form a green fluorescent film (3) . Then a blue fluorescent film (4) and a red fluorescent film (5) are formed by the same procedure.
Then, an emulsion film is formed and Al-deposited.
i
In the three color fluorescent films, the green fluorescencer comprises ZnS : Cu/Al, ZnS : Au,Al, [(Zn,Cd)S : Cu,Al] etc.; the blue fluorescencer comprises ZnS : Ag, ZnS : Ag,Al, etc., and the red fluorescencer comprises Y202S : Eu, Y203 : Eu, etc.
These three color fluorescencers should have good radiation color purity as three primary color light, and high radiation
efficiency to the electronic ray stimulating energy, i.e., high radiating brightness.
At present, same colored pigment as the radiation color is adhered onto the surface of the fluorescencer core in order to improve the radiation color purity and contrast of the screen. Though such a pigment-adhered fluorescencer is advantageous for the
FIG. 3 is a structural view of a conventional fluorescent film.
FIG. 4 is structural view of a fluorescent film according to the present invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
As shown in FIG. 4, illustrating the structure of the fluorescent film according to the present invention, the fluorescent film of the present invention is different from the conventional fluorescent film [FIG. 3] in that the former comprises multi-layer structure of the red fluorescent film.
On the inner surface of a face plate of panel (1) to which BM has been formed, a green fluorescent film (3) and a blue fluorescent film is formed, and the red fluorescent film comprises the first red fluorescencer layer (6) and the second red fluorescencer layer (7).
In the above-mentioned structure, the multi-layer fluorescent film is prepared by injecting a composition for the first red fluorescencer layer (6) comprising Y202S : Eu adhered with a pigment by rotary coating method, drying and light-exposing thereof (the layer is not developed); injecting a composition for the second red fluorescencer layer (7) comprising Y203 : Eu which is not adhered with a pigment, drying, light-exposing and developing thereof; and coating with acrylic emulsion.
STATEMENT OF INVENTION
This invention relates to a structure of a fluorescent film for a color Braun tube
comprising:
fluorescent films with three color fluorescencers of green, blue and red, wherein the
fluorescent film of the red fluorescencer comprises fluorescencer layers having a
laminate structure made of at least two different composition as herein described.
Though, in the example of the present invention, the first fluorescencer layer comprises Y202S : Eu, and the second layer comprises Y203 : Eu, the composition of each layer can be exchanged, and each layer is not limited to a composition.
According to the present invention, a fluorescent film having high radiation efficiency without lowering overall color purity, by passing the light radiated from the second fluorescencer layer (7) having excellent radiation efficiency through the first fluorescencer layer (6) having excellent color purity.
As described above, according to the present invention, a red fluorescent film is formed to overcome the inherent disadvantages of fluorescencers, and the characteristics of laminated fluorescencers having different compositions are complemented each other, to obtain a fluorescent film having improved color purity, brightness, and so on. It provides an excellent fluorescent screen of a fluorescent lamp or a projection type cathode-ray tube as well as a color Braun tube.

We claim
1. A structure of a fluorescent film for a color Braun tube comprising:
fluorescent films with three color fiuorescencers of green, blue and red, wherein the fluorescent film of the red fluorescencer comprises fluorescencer layers having a laminate structure made of at least two different composition as herein described.
2. A structure of a fluorescent film for a color Braun tube as claimed in claim 1, wherein
the fluorescent film of the red fluorescencer comprises a film of Y2O2S : Eu and
Y203 : Eu.
3. A structure of a fluorescent film for a color Braun tube as claimed in claim 2, wherein
the film thickness of the said Y2O2S : Eu is 10 - 50 % of the said Y2O3 : Eu.
4. A structure of a fluorescent film for a color Braun tube as claimed in claim 2, wherein
a first red fluorescencer film comprising Y2O2S : Eu and a second red fluorescencer
film comprising Y2O3 : Eu have been subsequently laminated.
5. A structure of a fluorescent film for a color Braun tube as herein substantially
described and illustrated in accompanying drawings with reference to Figure 4.

Documents:

772-del-1996-abstract.pdf

772-del-1996-claims.pdf

772-del-1996-complete specification (granted).pdf

772-del-1996-correspondence-others.pdf

772-DEL-1996-Correspondence-PO.pdf

772-DEL-1996-Description (Complete).pdf

772-del-1996-drawings.pdf

772-del-1996-form-1.pdf

772-del-1996-form-2.pdf

772-del-1996-form-3.pdf

772-del-1996-form-4.pdf

772-del-1996-Form-6.pdf

772-del-1996-gpa.pdf

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Patent Number

195857

Indian Patent Application Number

772/DEL/1996

PG Journal Number

31/2009

Publication Date

31-Jul-2009

Grant Date

18-Aug-2006

Date of Filing

10-Apr-1996

Name of Patentee

LG. ELECTRONICS INC.

Applicant Address

20, YOIDO-DONG, YOUNGDUNGPO-KU, SEOUL KOREA.

Inventors:

#	Inventor's Name	Inventor's Address
1	SEOUG WAN KANG	BELLA APT. C-205, 42, SONGJEONG-DONG, KUMI-SI, KYUNGSANGBUK-DO, KOREA.
2	SEOUG WAN KANG	BELLA APT. C-205, 42, SONGJEONG-DONG, KUMI-SI, KYUNGSANGBUK-DO, KOREA.
3	SEOUG WAN KANG	BELLA APT. C-205, 42, SONGJEONG-DONG, KUMI-SI, KYUNGSANGBUK-DO, KOREA.

PCT International Classification Number

H01J 29/26

PCT International Application Number

N/A

PCT International Filing date

PCT Conventions:

#	PCT Application Number	Date of Convention	Priority Country
1	8972/1995	1995-04-17	Republic of Korea