Method of making glass structures for flat panel displays

• US 6,321,571 B1
• Filed: 12/10/1999
• Issued: 11/27/2001
• Est. Priority Date: 12/21/1998
• Status: Expired due to Term

• Current Assignee: Corning Incorporated
• Original Assignee: Corning Incorporated
• Inventors: Themont, Jean-Pierre, Theron, Jean-Jacques B.
• Primary Examiner(s): Colaianni, Michael
• Application Number:
  US09/458,913
• Time in Patent Office: 718 Days
• Field of Search: 65/173, 65/63, 651/55, 349/155, 349/156, 156/89.12, 156/230, 156/231, 156/233, 156/247, 156/240, 427/163.1, 427/163.3, 427/383.5, 427/428
• US Class Current: 65/155
• CPC Class Codes: C03C 17/02 with glass C03C17/34, C03C17/44 take precedence
• CPC Class Codes: C03C 2218/335 Reverse coating
• CPC Class Codes: G02F 1/13334 Plasma addressed liquid crystal cells [PALC]
• CPC Class Codes: H01J 2211/36 Spacers, barriers, ribs, partitions or the like
• CPC Class Codes: H01J 9/242 Spacers between faceplate and backplate

Abstract

An assembly of rib structures sandwiched between a dielectric glass layer and a glass substrate for use in a flat panel display, such as plasma addressed liquid crystal (PALC) displays, is formed by a number of methods. One method includes molding thermoplastic glass frit containing paste into rib structures, transferring the rib structures to a thin transparent layer of a thermoplastic dielectric glass frit containing composition on a drum, and transferring the rib structures with the thin transparent dielectric glass layer to a glass substrate having metallic electrodes already formed thereon.

Claims

1. A method of manufacturing an assembly of rib structures sandwiched between a thin dielectric glass layer and a glass substrate for use in a plasma addressed liquid crystal display, the method comprising:

introducing a curable glass frit containing paste into cavities in a mold to form the rib structures;

forming a thin layer of a dielectric glass frit containing composition on a collector drum;

transferring the rib structures from the mold to the dielectric glass frit containing layer on the collector drum; and

transferring the rib structures and thin dielectric glass frit containing layer from the collector drum to the glass substrate.

2. The method according to claim 1, wherein the mold is a soft intaglio mold.

3. The method according to claim 2, wherein the mold comprises silicone.

4. The method according to claim 1, wherein the mold is a film on a rigid substrate, said film having slots formed therein at locations corresponding to the desired barrier ribs.

5. The method according to claim 4, wherein the film comprises silicone.

6. The method according to claim 1, wherein the glass frit containing paste comprises glass frit and a thermoplastic binder.

7. The method according to claim 6, wherein the dielectric glass frit containing composition comprises a dielectric glass frit and a thermoplastic binder.

8. The method according to claim 7, wherein the dielectric glass frit containing layer on the collector drum is heated to a temperature of from about 40°

C. to about 150°

C.

9. The method of claim 8, wherein said step of transferring said ribs onto said dielectric glass frit containing layer comprises pressing said mold against said heated dielectric glass frit containing layer on said collector drum such that said rib structures contact said dielectric glass frit containing layer, cooling said dielectric glass frit-containing layer while in contact with said barrier rib structures, and removing said mold.

10. The method according to claim 1, wherein the thin dielectric glass frit containing layer is from about 15 μ

m to about 50 μ

m in thickness.

11. The method according to claim 6, wherein said rib structures and dielectric glass frit containing layer are transferred from said collector roll to said substrate by contacting said rib structures to said substrate.

12. The method according to claim 11, wherein said substrate is heated to a temperature of from about 40°

C. to about 150°

C. prior to contacting said rib structures.

13. The method according to claim 1, wherein the forming of a thin layer of a dielectric glass frit containing composition on the collector drum comprises providing a transparent dielectric glass paste onto a polymer film on the collector drum.