Flat display apparatus and method of manufacturing the same

• US 6,778,248 B1
• Filed: 05/19/2000
• Issued: 08/17/2004
• Est. Priority Date: 05/19/1999
• Status: Expired due to Term

• Current Assignee: Japan Display Central Incorporated (Japan Display Incorporated)
• Original Assignee: Kabushiki Kaisha Toshiba (Toshiba Corporation)
• Inventors: Ootaguro, Hiroshi, Okano, Kazuyoshi, Tanaka, Akiko
• Primary Examiner(s): Kim, Robert H.
• Assistant Examiner(s): DI GRAZIO, JEANNE A
• Application Number:
  US09/573,890
• Time in Patent Office: 1,551 Days
• Field of Search: 349/153, 349/155, 349/156, 349/158, 349/190
• US Class Current: 349/153
• CPC Class Codes: G02F 1/13394 spacers regularly patterned on the cell subtrate, e.g. walls, pillars G02F1/133377 takes precedence

Abstract

A flat display apparatus incorporating a first substrate, a second substrate disposed opposite to the first substrate at a position distant from the first substrate for a predetermined distance, a sealing material disposed between the first and second substrates and formed into a frame-like shape to bond the first and second substrates to each other, a light modulation layer held in a gap between the first and second substrates bonded to each other with the sealing material, and spacers secured integrally with at least either of the first and second substrates to maintain the gap, wherein a portion of the spacers is disposed in the sealing-material portion and another portion of the spacers projects from the sealing material.

Claims

1. A flat display apparatus comprising:

a first substrate;

a second substrate disposed opposite to and apart from the first substrate for a predetermined distance;

a sealing material disposed between the first and second substrates and formed into a frame-like shape to bond the first and second substrates to each other;

a light modulation layer held in a gap between the first and second substrates bonded to each other with the sealing material; and

columnar patterned spacers secured integrally with at least either of the first and second substrates to maintain the gap, the spacers being formed of a different material from the sealing material;

wherein the spacers are disposed apart from and across a parting line which is formed along substantial centers of the sealing material in the widthwise direction of the sealing material, and

wherein a portion of each of the spacers is disposed in the sealing material and other portion of the spacers projects from the sealing material.

2. A flat display apparatus according to claim 1, wherein the spacers include the other portion projecting from the sealing material in all of cross sections which are in parallel with the first and second substrates.

3. A flat display apparatus according to claim 2, wherein the spacers are disposed on the two sides of the parting line which is formed along substantial centers of the sealing material in the widthwise direction of the sealing material.

4. A flat display apparatus according to claim 3, wherein the spacers are disposed in a zigzag configuration with respect to the parting line.

5. A flat display apparatus according to claim 1, wherein each of the spacers has a streamline cross sectional shape when the spacer is cut with a plane which is in parallel with the first substrate or the second substrate.

6. A flat display apparatus according to claim 1, wherein each of the spacers has a streamline cross sectional shape when the spacer is cut with a plane which is in parallel with the first substrate or the second substrate, and the longitudinal direction of the cross section and the widthwise direction of the sealing material substantially coincide with each other.

7. A flat display apparatus according to claim 1, wherein the flat display apparatus does not include the other spacers which are disposed apart from the parting line formed along substantial centers of the sealing material in the widthwise direction of the sealing material and which are enclosed by the sealing material.

8. A flat display apparatus according to claim 1, wherein the flat display includes the other spacers disposed apart from the parting line which is formed along substantial centers of the sealing material in the widthwise direction of the sealing material and enclosed by the sealing material, each of the other spacers has a streamline cross section when the spacer is cut with a plane which is in parallel with the first and second substrates and the longitudinal direction of the cross section shape and the widthwise direction of the sealing material substantially coincide with the other.

9. A flat display apparatus according to claim 1, wherein the flat display apparatus includes other spacers enclosed by the sealing material and disposed on a parting line formed along substantial centers of the sealing material in the widthwise direction of the sealing material.

10. A method of manufacturing a flat display apparatus incorporating first and second substrates, a light modulation layer disposed between the substrates, a sealing material disposed between the substrates and formed into a frame-like shape enclosing the light modulation layer and spacers provided integrally with the first substrate to maintain a predetermined distance between the first and second substrates, the method of manufacturing a flat display apparatus comprising the steps of:

providing columnar patterned spacers for the first substrate;

coating a sealing material on either of the first substrate or the second substrate;

positioning the spacers apart from the sealing material after coating the sealing material;

overlaying the first and second substrates through the sealing material and the spacers; and

applying pressure to the first and second substrates with heating or irradiating light to harden the sealing material to form the sealing-material portion and forming a portion of the spacers in the sealing-material portion and another portion to project from the sealing-material portion.

11. A method of manufacturing a flat display apparatus according to claim 10, wherein the sealing step is an air pressure sealing step.

12. A method of manufacturing a flat display apparatus according to claim 11, wherein the sealing step is performed such that the temperature of the first and second substrates is controlled at a temperature rising rate of 3°

C./min or higher.

13. A flat display apparatus comprising:

a light modulation layer held between a pair of substrates disposed opposite to each other through columnar patterned spacers; and

a sealing material applied in the form of a rectangular configuration along the outer periphery of the substrate, wherein

at least either of the pair of substrates includes the spacers for maintaining a predetermined distance between the pair of the substrates in a region in which the sealing material is formed, and the spacers are disposed on two sides of a parting line formed along substantial centers in the widthwise direction of the region in which the sealing material is formed, and

each of the spacers has a length in the widthwise direction of the region in which the sealing material is formed which is longer than a length of each spacer in a direction perpendicular to the widthwise direction.

14. A flat display apparatus according to claim 13, wherein each of the spacers has a streamline cross sectional shape when the spacer is cut with a plane which is in parallel with the substrate.

15. A flat display apparatus according to claim 13, wherein an driving circuit for operating the flat display apparatus is provided for either of the pair of the substrates, and the driving circuit is disposed in the region in which the sealing material is formed.

16. A flat display apparatus according to claim 13, wherein the spacers are zigzag disposed across the parting line.