Seal pattern for liquid crystal device

• US 6,473,148 B1
• Filed: 11/28/2000
• Issued: 10/29/2002
• Est. Priority Date: 11/28/2000
• Status: Expired due to Term

• Current Assignee: Lumentum Fiber Optics, Inc. (Lumentum Holdings Inc.)
• Original Assignee: YAFO Networks, Inc.
• Inventors: Suh, Seong Woo
• Primary Examiner(s): DUDEK, JAMES A
• Application Number:
  US09/724,982
• Time in Patent Office: 700 Days
• Field of Search: 349/153, 349/156, 349/190
• US Class Current: 349/153
• CPC Class Codes: G02F 1/1339 Gaskets; Spacers; Sealing of cells

Abstract

A seal pattern formed on a substrate of a liquid crystal device (LCD) is provided. The seal pattern at least includes a primary seal pattern that substantially surrounds the active area of the LCD and a dummy seal pattern that is formed at least partially inside the primary seal pattern. The dummy seal pattern can be formed substantially around one or more active areas of the LCD. The dummy seal pattern includes a plurality of discontinuous seal portions. Methods for making an LCD with the seal pattern according to this invention are also provided.

Claims

1. A seal pattern formed on at least one substrate of a liquid crystal device having at least one active area, said seal pattern comprising:

a primary seal pattern that substantially surrounds the at least one active area; and

a double wall patterned dummy seal formed within the primary seal pattern, each wall of the double wall patterned dummy seal comprising a plurality of discontinuous seal portions.

2. The seal pattern of claim 1 wherein said at least one active area is a plurality of active areas, wherein said primary seal pattern substantially encloses all of said plurality of active areas, and said double wall patterned dummy seal is disposed at least partially between adjacent active areas.

3. The seal pattern of claim 1 wherein said primary seal pattern includes a liquid crystal infection port, wherein said seal pattern comprises an end seal for sealing said liquid crystal injection port, and wherein at least a portion of the double wall patterned dummy seal is positioned near said port to prevent said end seal from contaminating the active area.

4. The seal pattern of claim 1 wherein said double wall patterned dummy seal is formed with a shape that is substantially similar to the primary seal pattern, without regard to said liquid crystal injection port.

5. The seal pattern of claim 2 wherein said double wall patterned dummy seal is located between said adjacent active areas.

6. The seal pattern of claim 5 wherein substantially all portions of the double wall patterned dummy seal are positioned at approximately the same distance between adjacent active areas.

7. A liquid crystal device comprising:

a pair of spaced substrates having at least one active area defined there between;

a primary seal pattern between the pair of substrates that substantially circumscribes the active area;

a liquid crystal material located in said primary seal pattern; and

a dummy seal pattern formed at least partially inside said primary seal pattern and substantially around the active area, said dummy seal pattern comprising a parallel, double wall structure, wherein each wall in the parallel, double wall structure comprises a plurality of discontinuous seal portions.

8. The liquid crystal device of claim 7 wherein said at least one active area is a plurality of active areas, and wherein said primary seal pattern substantially encloses all of said plurality of active areas and said dummy seal pattern is disposed between adjacent active areas.

9. The liquid crystal device of claim 7 wherein said primary seal pattern includes a liquid crystal injection port, and wherein said seal pattern comprises an end seal for sealing said liquid crystal injection port, wherein at least one of said seal portions is positioned near said port to prevent said end seal from contaminating the active area.

10. The liquid crystal device of claim 7 wherein said plurality of discontinuous seal portions form a shape that is substantially similar to the primary seal pattern, without regard to said liquid crystal injection port.

11. The liquid crystal device of claim 7 wherein said liquid crystal device has a plurality of active areas, and wherein said dummy seal pattern is located between said adjacent active areas.

12. The liquid crystal device of claim 11 wherein said dummy seal pattern is located between all adjacent active areas.

13. The liquid crystal device of claim 11 wherein said dummy seal pattern is substantially evenly distributed between all adjacent active areas.

14. The liquid crystal device of claim 7 wherein said dummy seal pattern comprises at least two substantially parallel rows, each of said rows comprising a plurality of discontinuous seal portions.

15. A fiber optic apparatus comprising:

a liquid crystal device located in an optical path of a beam of light, said device comprising;

a pair of spaced substrates forming a substantially uniform gap there between, each of said substrates having at least one electrically controlled electrode disposed thereon and overlapping with the other electrode,

a primary seal pattern between the pair of substrates that substantially circumscribes an active area of the device,

a liquid crystal material between said spaced substrates and within said primary seal pattern, and

a dummy seal pattern formed at least partially inside said primary seal pattern, said dummy seal pattern comprising a parallel, double wall structure, wherein each wall in the parallel, double wall structure comprises a plurality of discontinuous seal portions;

a first optical fiber for providing light to said active area of said device; and

a second optical fiber for receiving light after evolving through said active area of said device.

16. The apparatus of claims 15 further comprising a first collimator between said input optical fiber and said device.

17. The apparatus of claim 15 further comprising a second collimator between said device and said output optical fiber.

18. The apparatus of claim 15 further comprising a voltage source for applying a potential difference between said electrodes to modify the polarization state of the light beam evolving through said liquid crystal material.