High-brightness phosphor screen and method for manufacturing the same

• US 6,919,683 B1
• Filed: 11/01/2000
• Issued: 07/19/2005
• Est. Priority Date: 11/01/1999
• Status: Expired due to Fees

• Current Assignee: Samsung SDI Company Limited
• Original Assignee: Samsung SDI Company Limited
• Inventors: Jang, Jae-eun
• Primary Examiner(s): Glick, Edward J.
• Assistant Examiner(s): Yun, Jurie
• Application Number:
  US09/702,850
• Time in Patent Office: 1,721 Days
• Field of Search: 313/503, 252/301.6 S, 252/301.6 R
• US Class Current: 313/503
• CPC Class Codes: H01J 29/187 screens with more than one luminescent material (as mixtures for the treatment of the screens) for several superimposed luminescent layers H01J29/26; for adjacent dots or lines of different luminescent material H01J29/32
• CPC Class Codes: H01J 29/20 characterised by the luminescent material
• CPC Class Codes: H01J 9/223 by uniformly dispersing of liquid
• CPC Class Codes: H01J 9/2276 Development of latent electrostatic images per se G03G15/06
• CPC Class Codes: H01J 9/2277 by other processes, e.g. serigraphy, decalcomania

Abstract

A high-brightness phosphor screen and a method for forming the same are provided. The high-brightness phosphor screen having a low or middle working voltage, unlike a method of improving luminescent properties by use of a new synthetic phosphor, can be formed by simple deposition of a phosphor mixture that contains a proper ratio of a blue or green light-emitting phosphor for color image display and a bluish green light-emitting ZnO:Zn phosphor with high luminescent efficiency at low voltages.

Claims

1. A high-brightness phosphor screen, comprising:

a luminescent material for emitting light of a predetermined color, used for color image display;

the luminescent material comprises at least one blue light-emitting phosphor selected from the group consisting of (Zn,Cd)S;

Ag, (Zn,Cd)S;

Ag,Cl, (Zn,Cd)S;

Ag,Cl,Al and (Zn,Cd)S;

Ag,Cl,Mg, or a green light-emitting phosphor, (Zn,Cd)S;

Cu,Al,Au; and

a ZnO;

Zn phosphor capable of enhancing the brightness of the display,

wherein the mixing ratio of the luminescent material to the ZnO;

Zn phosphor is varied according to a desired level of the brightness.

2. The high-brightness phosphor screen of claim 1, wherein the amount of the ZnO:

Zn phosphor added is 20% or less by weight based on the weight of the luminescent material.

3. A method for forming a high-brightness phosphor screen by mixing a luminescent material for emitting light of a predetermined color and a predetermined amount of a ZnO:

Zn phosphor, the method comprising the steps of;

(a) preparing a phosphor mixture solution by dispersing the luminescent material and the ZnO;

Zn phosphor in a solvent, wherein the luminescent material comprises at least one blue light-emitting phosphor selected from the group consisting of (Zn,Cd)S;

Ag, (Zn,Cd)S;

Ag,Cl, (Zn,Cd)S;

Ag,Cl,Al and (Zn,Cd)S;

Ag,Cl,Mg, or a green light-emitting phosphor, (Zn,Cd)S;

Cu,Al,Au;

(b) forming a phosphor layer by depositing the phosphor mixture solution on a substrate; and

(c) evaporating the solvent from the deposited phosphor layer.

4. The method of claim 3, wherein the amount of the ZnO:

Zn phosphor added is 20% or less by weight based on the weight of the luminescent material.

5. The method of claim 3, wherein, in step (b), the phosphor layer is formed by depositing the phosphor mixture solution on the substrate with the application of electrophoresis, screening, photolithography or precipitation.

6. A high-brightness phosphor screen formed by the method of claim 3.