IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0560949
(2009-09-16)
|
등록번호 |
US-8134666
(2012-03-13)
|
우선권정보 |
JP-2003-392976 (2003-11-21); JP-2004-024638 (2004-01-30); JP-2004-279373 (2004-09-27) |
발명자
/ 주소 |
- Itadani, Motohiro
- Okude, Shuhei
- Yamanaka, Shunsuke
- Arakawa, Kohei
|
출원인 / 주소 |
|
대리인 / 주소 |
Birch, Stewart, Kolasch & Birch, LLP
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
14 |
초록
▼
A liquid crystal display device of an in-plane switching mode comprises at least optically anisotropic members (A) and (B) and a liquid crystal cell disposed between a pair of polarizers having absorption axes disposed approximately perpendicularly to each other, wherein nzAnyA and nxBnzB (nxA, nxB:
A liquid crystal display device of an in-plane switching mode comprises at least optically anisotropic members (A) and (B) and a liquid crystal cell disposed between a pair of polarizers having absorption axes disposed approximately perpendicularly to each other, wherein nzAnyA and nxBnzB (nxA, nxB: refractive indices (n) in the direction of the in-plane slow axis; nyA, nyB: n in the in-plane direction perpendicular to the above direction; nzA, nzB: n in the direction of thickness, each at 550 nm); the in-plane slow axes of (A) and (B) are approximately parallel or perpendicular to each other; and the in-plane slow axis of (A) is approximately parallel or perpendicular to the absorption axis of a polarizer closer to (A). The antireflection property, scratch resistance and durability are excellent, the angle of field is wide, and uniform display of images with great contrast can be achieved at any angle of observation.
대표청구항
▼
1. A liquid crystal display device of an in-plane switching mode which comprises a pair of polarizers which are a polarizer at an output side and a polarizer at an incident side and disposed at relative positions such that absorption axes of the polarizers are approximately perpendicular to each oth
1. A liquid crystal display device of an in-plane switching mode which comprises a pair of polarizers which are a polarizer at an output side and a polarizer at an incident side and disposed at relative positions such that absorption axes of the polarizers are approximately perpendicular to each other and at least optically anisotropic member (A), optically anisotropic member (B) and a liquid crystal cell which are disposed between the pair of polarizers, wherein nzA>nyA and nxB>nzB when, with respect to optically anisotropic member (A) and optically anisotropic member (B), refractive indices in a direction of an in-plane slow axis are represented by nxA and nxB, respectively, refractive indices in a direction in-plane and perpendicular to the direction of an in-plane slow axis are represented by nyA and nyB, respectively, and refractive indices in a direction of a thickness are represented by nzA and nzB, respectively, each measured using light having a wavelength of 550 nm, wherein the liquid crystal display device is in the following configuration, wherein optically anisotropic member (A) and optically anisotropic member (B) are disposed between the polarizer at the incident side and the liquid crystal cell, the absorption axis of the polarizer at the output side and the in-plane slow axis of the liquid crystal of the liquid crystal cell under application of no voltage are disposed at relative positions parallel to each other, the in-plane slow axis of optically anisotropic member (A) and the in-plane slow axis of optically anisotropic member (B) are disposed at relative positions approximately parallel to each other, and the in-plane slow axis of optically anisotropic member (B) and the in-plane slow axis of the liquid crystal of the liquid crystal cell under application of no voltage are disposed at relative positions approximately parallel to each other, and whereinan in-plane retardation Re(A), a retardation in the direction of the thickness Rth (A) of optically anisotropic member (A), and an in-plane retardation Re(B), a retardation in the direction of the thickness Rth(B) of optically anisotropic member (B) satisfy the following formulae: 70≦Re(A)≦120,−65≦Rth(A)≦−25,50≦Re(B)≦110 and25≦Rth(B)≦70,whereinRe(A)=(nxA−nyA)×dA, Re(B)=(nxB−nyB)×dB,Rth(A)=[(nxA+nyA)/2−nzA]×dA, Rth(B)=[(nxB+nyB)/2−nzB]×dB, dA and dB representing thicknesses of optically anisotropic member (A) and (B), respectively, and the units of retardations in the formulae described above are expressed by nm. 2. The liquid crystal display device according to claim 1, wherein an absolute value of a difference between nxA and nzA is 0.003 or smaller, and an absolute value of a difference between nyB and nzB is 0.003 or smaller. 3. The liquid crystal display device according to claim 1, wherein optically anisotropic member (A) comprises a layer selected from following layers (i) to (iii): (i) A layer comprising a material having a negative value of intrinsic birefringence,(ii) A layer comprising discotic liquid crystal molecules or lyotropic liquid crystal molecules,(iii) A layer comprising a photo-isomerizable substance. 4. The liquid crystal display device according claim 1, wherein optically anisotropic member (A) is disposed at a position closer to the liquid crystal cell than optically anisotropic member (B).
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