Alignment layer, method for forming alignment layer and LCD having the same

• US 5,946,064 A
• Filed: 12/29/1997
• Issued: 08/31/1999
• Est. Priority Date: 12/30/1996
• Status: Expired due to Fees

• Current Assignee: Samsung Display Devices Co., Ltd. (Samsung SDI Company Limited)
• Original Assignee: Samsung Display Devices Co., Ltd. (Samsung SDI Company Limited)
• Inventors: Lee, Eung-sang
• Primary Examiner(s): Sikes, William L.
• Assistant Examiner(s): NGO, HUYEN LE
• Application Number:
  US08/998,480
• Time in Patent Office: 610 Days
• Field of Search: 349/10, 349/124, 349/135, 349/299
• US Class Current: 349/124
• CPC Class Codes: G02F 1/13378 by treatment of the surface, e.g. embossing, rubbing or light irradiation G02F1/133711, G02F1/133734, G02F1/133753 take precedence
• CPC Class Codes: G02F 1/133788 by light irradiation, e.g. linearly polarised light photo-polymerisation

Abstract

An alignment layer, a method for forming the alignment layer, and a liquid crystal display (LCD) adopting the alignment layer are provided. The alignment layer includes a heat-curable resin layer having microgrooves and an optical alignment polymer layer, coated on the heat-curable resin layer. According to the present invention, the thermal stability of the alignment layer is improved. Accordingly, an LCD adopting the alignment layer has improved display performance.

Claims

1. An alignment layer comprising:

a heat-curable resin layer having microgrooves; and

an optical alignment polymer layer coated on the heat-curable resin layer.

2. An alignment layer as claimed in claim 1, wherein the heat-curable resin layer is formed of epoxy resin.

3. An alignment layer as claimed in claim 1, wherein the depth of one microgroove in the microgrooves is 100˜

500 Å

.

4. An alignment layer as claimed in claim 1, wherein the width of one microgroove in the microgrooves is 1,000˜

10,000 Å

.

5. A method for forming an alignment layer comprising the steps of:

(a) forming a heat-curable resin layer on a substrate having electrodes;

(b) forming microgrooves on the surface of the heat-curable resin layer; and

(c) coating a polymer having an optical alignment property on the heat-curable resin layer having the microgrooves and irradiating ultraviolet rays on the resultant structure.

6. A method for forming an alignment layer as claimed in claim 5, wherein the heat-curable epoxy resin layer is formed of epoxy resin.

7. A method for forming an alignment layer as claimed in claim 5, wherein the depth of the microgrooves is 100˜

500 Å

.

8. A method for forming an alignment layer as claimed in claim 5, wherein the width of the microgrooves is 1,000˜

10,000 Å

.

9. A liquid display comprising upper and lower substrates, transparent electrodes formed on the upper and lower substrates, optical alignments formed on the transparent electrodes, wherein the optical alignment is a bilayered structure of a heat-curable resin layer and an optical alignment polymer layer.

10. A liquid crystal display as claimed in claim 9, wherein the heat-curable resin layer is formed of epoxy resin.

11. A liquid crystal display as claimed in claim 9, wherein the depth of one microgroove in the microgrooves is 100˜

500 Å

.

12. A liquid crystal display as claimed in claim 9, wherein the width of one microgroove in the microgrooves is 1,000˜

10,000 Å

.