CIRCULAR POLARIZER COMPOSITE AND AN OPTICAL SYSTEM COMPRISING THE SAME

• US 20100002296A1
• Filed: 05/25/2007
• Published: 01/07/2010
• Est. Priority Date: 06/13/2006
• Status: Abandoned Application

• Current Assignee: 3M Innovative Properties Company (3M Company)
• Original Assignee: 3M Innovative Properties Company (3M Company)
• Inventors: Choi, Jong-Bok, Seo, Youngduck, Seo, Yeong-Yeon, Kim, Yeon-Shin, Lee, Seo-Hem, Park, Youngsoo
• Application Number:
  US12/304,334
• Publication Number:
  US 20100002296A1
• Time in Patent Office: Days
• US Class Current: 359/485
• CPC Class Codes: G02B 27/281 used for attenuating light intensity, e.g. comprising rotatable polarising elements

Abstract

A circular polarizer composite including a plane polarizer, a first quarter-wavelength retarder, a cholesteric liquid crystal (CLC) film and a second quarter-wavelength retarder, wherein optical axes of the first quarter-wavelength retarder and the second quarter-wavelength retarder are perpendicularly crossed to each other. Also disclosed is an optical system including the circular polarizer composite and an emissive display module.

Claims

1. A circular polarizer composite, comprising:

a plane polarizer;

a first quarter-wavelength retarder;

a cholesteric liquid crystal (CLC) film; and

a second quarter-wavelength retarder,

wherein optical axes of the first quarter-wavelength retarder and the second quarter-wavelength retarder are perpendicularly crossed to each other.

2. The circular polarizer composite of claim 1, wherein the CLC film comprises three different pitch layers.

3. The circular polarizer composite of claim 2, wherein the three different pitch layers comprise layers having red (R), green (G) and blue (B) wavelength ranges, respectively.

4. An optical system, comprising:

a circular polarizer composite, comprising;

a plane polarizer;

a first quarter-wavelength retarder;

a cholesteric liquid crystal (CLC) film;

a second quarter-wavelength retarder; and

an emissive display module,

wherein optical axes of the first quarter-wavelength retarder and the second quarter-wavelength retarder are perpendicularly crossed to each other.

5. The optical system of claim 4, wherein the CLC film comprises three different pitch layers.

6. The optical system of claim 5, wherein the three different pitch layers comprise layers having red (R), green (G) and blue (B) wavelength ranges, respectively.

7. The optical system of claim 4, wherein the emissive display module is an organic light emitting diode or a plasma display device.