Method for making a field emission display

• US 6,342,276 B1
• Filed: 06/29/2000
• Issued: 01/29/2002
• Est. Priority Date: 12/10/1999
• Status: Expired due to Fees

• Current Assignee: Samsung SDI Company Limited
• Original Assignee: Samsung SDI Company Limited
• Inventors: You, Jong-Hun
• Primary Examiner(s): PIANALTO, BERNARD D
• Application Number:
  US09/607,188
• Time in Patent Office: 579 Days
• Field of Search: 427/555, 427/557, 427/77, 427/122, 427/123, 427/126.3, 427/261, 427/264, 427/265, 427/270, 427/271, 427/367, 427/372.2, 427/380, 427/383.1, 427/404, 427/419.2, 101/114
• US Class Current: 427/555
• CPC Class Codes: H01J 2209/0223 Field emission cathodes
• CPC Class Codes: H01J 9/025 of field emission cathodes
• CPC Class Codes: H05K 1/095 for polymer thick films, i.e. having a permanent organic polymeric binder
• CPC Class Codes: H05K 3/027 the conductive material being removed by irradiation, e.g. by photons, alpha or beta particles

Abstract

A very fine pixel pattern can be formed by first screen printing a conductive paste and electron-emitting carbon paste material in sequence before removing a predetermined portion of the screen-printed layers simultaneously such that remaining portions become a fine pixel pattern. This method not only enables fine pixel pattern formation but also provides an electrode/emitter structure that increases electron emission. Furthermore all these improvements can be made with less manufacturing time and cost.

Claims

1. A method for making an FED comprising steps of

forming a conductive film made of electrically conductive material on a substrate,

irradiating laser beam on said conductive film in a predetermined pattern such that irradiated portions are removed leaving a cathode electrode pattern,

forming a film of electron emitting material on said substrate covering said cathode electrodes,

removing a predetermined portion of said film of electron emitting by laser irradiation.

2. A method for making an FED according to claim 1, wherein said electron emitting material includes graphite.

3. A method for making an FED according to claim 1, wherein said electron emitting material includes carbon nanotube.

4. A method for making an FED according to claim 1, wherein said laser beam has a wavelength in the range of 562-1024 nm.

5. A method for making an FED according to claim 1, wherein said laser beam is generated by an infrared laser.

6. A method for making an FED according to claim 1, wherein said conductive material is indium tin oxide.

7. A method for making an FED according to claim 1, wherein said conductive material is metal.

8. A method for making an FED according to claim 7, wherein said metal includes aluminum or chrome.

9. A method for making an FED according to claim 1, wherein said conductive film and said film of electron emitting material are formed by slurry of screen printing.

10. A method for making an FED comprising steps of

forming a conductive film made of electrically conductive material on a substrate,

forming a film of carbon electron emitting material on said conductive film,

irradiating laser beam of predetermined intensity on said film of electron emitting material in a predetermined pattern such that a predetermined portion of said conductive film and said film of carbon material are removed at the same time.

11. A method for making an FED according to claim 10, wherein said electron emitting material includes graphite.

12. A method for making an FED according to claim 10, wherein said electron emitting material includes carbon nanotube.

13. A method for making an FED according to claim 10, wherein said laser beam has a wavelength in the range of 562-1024 nm.

14. A method for making an FED according to claim 10, wherein said laser beam is generated by an infrared laser.

15. A method for making an FED according to claim 10, wherein said conductive material is indium tin oxide.

16. A method for making an FED according to claim 10, wherein said conductive material is metal.

17. A method for making an FED according to claim 16, wherein said metal includes aluminum or chrome.

18. A method for making an FED according to claim 10, wherein said conductive film and said film of electron emitting material are formed by slurry of screen printing.