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1. (KR1020080032067) RETARDATION FILM, POLARIZING PLATE, AND LIQUID CRYSTAL DISPLAY ELEMENT

Office : Republic of Korea
Application Number: 1020087000129 Application Date: 03.01.2008
Publication Number: 1020080032067 Publication Date: 14.04.2008
Publication Kind : A
IPC:
G02F 1/13363
G02F 1/1335
G02B 5/30
[IPC code unknown for ERROR IPC Code incorrect: invalid subgroup (0=>999999)!]
G PHYSICS
02
OPTICS
F
DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH IS MODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THE DEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY, COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g. SWITCHING, GATING, MODULATING OR DEMODULATING; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
1
Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
01
for the control of the intensity, phase, polarisation or colour
13
based on liquid crystals, e.g. single liquid crystal display cells
133
Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
1333
Constructional arrangements
1335
Structural association of optical devices, e.g. polarisers, reflectors, with the cell
G PHYSICS
02
OPTICS
B
OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS
5
Optical elements other than lenses
30
Polarising elements
CPC:
G02B 5/3083
C08J 5/18
C08J2301/00
Y10T 428/1041
Y10T 428/105
Y10T 428/1077
Applicants: KONICA MINOLTA OPTO, INC.
Inventors: TAMAGAWA MINORI
KUZUHARA NORIYASU
MICHIHATA ISAMU
Priority Data: 2005 2005198521 07.07.2005 JP
Title: (EN) RETARDATION FILM, POLARIZING PLATE, AND LIQUID CRYSTAL DISPLAY ELEMENT
Abstract:
(EN) Disclosed are a retardation film which can prevent the dispersion in the phase difference values which is a disadvantage of a conventional cellulose retardation film and shows a stable display quality, a polarizing plate and a liquid crystal display element. The retardation film comprises a cellulose derivative and a plasticizer, has a film thickness of 10 to 50μm inclusive, and has an Ro value represented by the formula (i) ranging from 30 to 100 nm inclusive, an Rt value represented by the formula (ii) ranging from 100 to 300 nm inclusive, and an S value represented by the formula (iii) ranging from 0.002 to 0.030 inclusive. Formula (i): Ro = (nx-ny)xd Formula (ii): Rt = Sxd Formula (iii): S = ((nx+ny)/2-nz) ©KIPO&WIPO 2008
Also published as:
CN101218521KR1020130095852WO/2007/007565