Fabricating method for a ferroelectric liquid crystal panel

• US 6,757,035 B2
• Filed: 12/21/2000
• Issued: 06/29/2004
• Est. Priority Date: 12/21/1999
• Status: Expired due to Term

• Current Assignee: LG Display Co., Ltd.
• Original Assignee: LG Philips LCD Company Limited (LG Display Co., Ltd.)
• Inventors: Choi, Su-Seok, Choi, Suk-Won
• Primary Examiner(s): Dudek, James A.
• Application Number:
  US09/740,967
• Publication Number:
  US 20010024261A1
• Time in Patent Office: 1,286 Days
• Field of Search: 349/87, 349/184, 349/172
• US Class Current: 349/85
• CPC Class Codes: G02F 1/13345 Network or three-dimensional gels
• CPC Class Codes: G02F 1/13775 Polymer-stabilized liquid crystal layers
• CPC Class Codes: G02F 1/141 using ferroelectric liquid crystals

Abstract

A liquid crystal display device, and a method of fabricating such a liquid crystal display device, that uses a ferroelectric liquid crystal (FLC). Additives are added to the ferroelectric liquid crystal. The additives are then used to form polymer networks, beneficially by exposure to ultraviolet light. Suitable additives include an acrylate compound.

Claims

1. A method of fabricating a liquid crystal display device, comprising:

forming a first orientation film on a first substrate;

forming a second orientation film on a second substrate;

spacing the first and second substrates apart by a gap;

forming a ferroelectric liquid crystal layer between the first and second substrates, the ferroelectric liquid crystal layer having an additive;

aligning the ferroelectric liquid crystal layer around a phase transition temperature of a SmC* phase; and

forming polymer networks in the ferroelectric liquid crystal layer by polymerizing the additives, wherein the ferroelectric liquid crystal layer has a mono-domain.

2. A method of fabricating a liquid crystal display device according to claim 1, wherein the additive includes an acrylate compound.

3. A method of fabricating a liquid crystal display device according to claim 1, wherein a weight % of the additive in the ferroelectric liquid crystal layer is between 1 and 3%.

4. A method of fabricating a liquid crystal display device according to claim 1, wherein the polymer networks are formed by exposing the ferroelectric liquid crystal layer to light.

5. A method of fabricating a liquid crystal display device according to claim 4, wherein the exposing light is ultraviolet.

6. A method of fabricating a liquid crystal display device according to claim 5, wherein the energy of the ultraviolet is between 40 and 200 nJ/cm².

7. A method of fabricating a liquid crystal display device according to claim 5, wherein the power of the ultraviolet is between 1 and 5 mW/cm².

8. A method of fabricating a liquid crystal display device according to claim 1, wherein the polymer networks are formed along molecule layer boundaries of the ferroelectric liquid crystal layer.

9. A method of fabricating a liquid crystal display device according to claim 1, wherein the polymer networks are formed across molecule layer boundaries of the ferroelectric liquid crystal layer.

10. A method of fabricating a liquid crystal display device according to claim 1, wherein the phase transition temperature includes those from the SmA phase to the SmC* phase.

11. A method of fabricating a liquid crystal display device according to claim 1, wherein the phase transition temperature includes those from the N* phase to the SmC* phase.

12. A method of fabricating a liquid crystal display device according to claim 1, wherein the ferroelectric liquid crystal layer is aligned around the phase transition temperature of the SmC* phase by applying a direct current electric field.