Laminated polarizing film

• US 7,038,746 B2
• Filed: 03/31/2003
• Issued: 05/02/2006
• Est. Priority Date: 03/31/2003
• Status: Expired due to Fees

• Current Assignee: Sumitomo Chemical Company Limited
• Original Assignee: Sumitomo Chemical Company Limited
• Inventors: Honda, Masaru, Nougi, Naoyasu, Tominaga, Toshihiko
• Primary Examiner(s): Dudek, James A.
• Application Number:
  US10/401,883
• Publication Number:
  US 20040189907A1
• Time in Patent Office: 1,128 Days
• Field of Search: 359/485, 349/96, 349/192
• US Class Current: 349/96
• CPC Class Codes: G02F 1/133528 Polarisers
• CPC Class Codes: G02F 1/133536 Reflective polarizers G02F1/13362 takes precedence
• CPC Class Codes: G02F 2202/22 Antistatic materials or arrangements

Abstract

It is aimed to provide a laminated polarizing film having an antistatic function, where static electricity occurs less even if the protective film is peeled off to bond the laminated polarizing film to a liquid crystal cell, and where defects such as bright spots are not caused in display. The aim is achieved by a laminated polarizing film, wherein a reflective polarizing film and an absorptive polarizing film are laminated, and an antistatic layer is further laminated at least either on the outside of the reflective polarizing film or between the reflective polarizing film and the absorptive polarizing film.

Claims

1. A laminated polarizing film comprising a reflective polarizing film, an absorptive polarizing film and an antistatic layer, wherein the reflective polarizing film and the absorptive polarizing film are laminated, an antistatic layer is further laminated at least either on the outside of the reflective polarizing film or between the reflective polarizing film and the absorptive polarizing film, and the antistatic layer has a surface resistivity of 1×

10¹³ Ω

/□

or lower.

2. The laminated polarizing film according to claim 1, wherein the antistatic layer is formed directly on the reflective polarizing film or the absorptive polarizing film.

3. The laminated polarizing film according to claim 1, wherein the antistatic layer is a coating of an antistatic agent.

4. The laminated polarizing film according to claim 1, wherein the antistatic layer is a film having a pencil hardness of F or higher.

5. The laminated polarizing film according to claim 1, wherein the antistatic layer has adhesiveness including a pressure-sensitive type.

6. The laminated polarizing film according to claim 1, wherein an optical compensation film is further laminated on the outside of the absorptive polarizing film.

7. A polarized light source device comprising the laminated polarizing film according to claim 1, a light source member, and a reflective plate, wherein the laminated polarizing, the light source member, and the reflective plate are located in this order.

8. A liquid crystal display comprising the polarized light source device according to claim 7, a liquid crystal cell and an absorptive polarizing film, wherein the liquid crystal cell and the absorptive polarizing film are laminated in this order at the front of the polarized light source device.

9. The liquid crystal display according to claim 8, wherein the liquid crystal cell is a lateral field type liquid crystal cell.

10. The laminated polarized film according to claim 1, wherein the antistatic layer has a surface resistivity of 1×

10¹¹ Ω

/□

or lower.

11. The laminated polarizing film according to claim 1, wherein the antistatic layer has a surface resistivity of 1×

10¹⁰ Ω

/□

or lower.