US RE40,655 E1
Polarization light splitting film, backlight system and liquid crystal display having particular diffusion layer under optical rotational selection layer
Fumihiro Arakawa, Tokyo (Japan); and Keiji Kashima, Tokyo (Japan)
Assigned to Dai Nippon Printing Co., Ltd., Shinjuku-Ku (Japan)
Filed on Dec. 16, 2005, as Appl. No. 11/303,093.
Application 11/303093 is a reissue of application No. 09/024983, filed on Feb. 17, 1998, now 6,559,911, filed on May 06, 2003.
Claims priority of application No. 9-048562 (JP), filed on Feb. 18, 1997.
Int. Cl. G02F 1/1335 (2006.01)
U.S. Cl. 349—96  [349/9; 349/98] 1 Claim
OG exemplary drawing
 
[ 13. A polarization light splitting film having a light receiving side and a light transmitting side, the polarization light splitting film comprising:
an optical rotation selection layer at the light receiving side for reflecting one of right and left circularly polarized components of a light beam that is incident on the light receiving side and for transmitting the other one of the right and left circularly polarized components of the light beam;
a quarter-wave layer laminated over the optical rotation selection layer at the light transmitting side and for emitting linearly polarized light;
a linear polarizing layer laminated over the quarter-wave layer at the light transmitting side and having a polarization axis which substantially matches a polarization axis of the linearly polarized light emitted from the quarter-wave layer; and
a diffusion layer disposed under the optical rotation selection layer at the light receiving side, the diffusion layer including at least two types of diffusion agents, each agent having a different average particle diameter within the range of 1 μm to 50 μm.]