Optical film

Stock material or miscellaneous articles – Liquid crystal optical display having layer of specified... – With viewing layer of specified composition

Reexamination Certificate

Rate now

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Details

C428S001100, C349S118000, C349S120000, C359S494010, C359S490020

Reexamination Certificate

active

07128952

ABSTRACT:
An optical film including a transparent polymer film (b) and a birefringent layer (a) formed of a polymer and laminated above the transparent polymer film (b) is provided. The birefringent layer (a) and the transparent polymer film (b) satisfy the following formula (1), the birefringent layer (a) satisfies the following formulae (2) and (3), and the polymer forming the birefringent layer (a) has a weight-average molecular weight in the range between 10,000 and 400,000 inclusive.in-line-formulae description="In-line Formulae" end="lead"?Δn(a)>Δn(b)×10  (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?1<(nx−nz)/(nx−ny)  (2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?0.0005≦Δn(a)≦0.5  (3)in-line-formulae description="In-line Formulae" end="tail"?This optical film can prevent the occurrence of iridescence, the occurrence of cracks, and the occurrence of variation in retardation.

REFERENCES:
patent: 5344916 (1994-09-01), Harris et al.
patent: 5528400 (1996-06-01), Arakawa
patent: 5550661 (1996-08-01), Clark et al.
patent: 5625474 (1997-04-01), Aomori et al.
patent: 5658505 (1997-08-01), Shimizu et al.
patent: 5750641 (1998-05-01), Ezzell et al.
patent: 5805253 (1998-09-01), Mori et al.
patent: 5999243 (1999-12-01), Kameyama et al.
patent: 6166799 (2000-12-01), Kameyama et al.
patent: 6359669 (2002-03-01), Dehmlow
patent: 6795246 (2004-09-01), Yano et al.
patent: 6881456 (2005-04-01), Yano et al.
patent: 0 487 359 (1992-05-01), None
patent: 1 160 591 (2001-12-01), None
patent: 3-24502 (1991-02-01), None
patent: 3-33719 (1991-02-01), None
patent: 6-130228 (1994-05-01), None
patent: 08-62422 (1996-03-01), None
patent: 8-511812 (1996-12-01), None
patent: 10-153708 (1998-06-01), None
patent: 10-508048 (1998-08-01), None
patent: 2000-190385 (2000-07-01), None
patent: 2000-511296 (2000-08-01), None
patent: 2001-290023 (2001-10-01), None
patent: 2001-318223 (2001-11-01), None
patent: 2001-337201 (2001-12-01), None
patent: 2001-343529 (2001-12-01), None
patent: 4-194820 (2004-07-01), None
patent: WO 94/24191 (1994-10-01), None
patent: WO 96/11967 (1996-04-01), None
patent: WO 97/44704 (1997-11-01), None
Suguru Yamamoto, Retardation Film for LCD, Nitto Technical Report, vol. 28, No. 2, pp. 105-113, Oct. 1990.

LandOfFree

Say what you really think

Search LandOfFree.com for the USA inventors and patents. Rate them and share your experience with other people.

Rating

Optical film does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Optical film, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Optical film will most certainly appreciate the feedback.

Rate now

     

Profile ID: LFUS-PAI-O-3713364

  Search
All data on this website is collected from public sources. Our data reflects the most accurate information available at the time of publication.