Liquid crystal display
AssigneeKonica Minolta Opto, Inc.
InventorKoji Tasaka
Life of this patent
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Abstract
A liquid crystal display comprising: a brightness enhancing film, polarizing plate (A), a liquid crystal cell, polarizing plate (B) laminated in that order, Wherein (i) polarizing plate (A) has a polarizing plate protective film facing the brightness enhancing film; (ii) the polarizing plate protective film is a cellulose ester film; (iii) an in-plane retardation value Ro(550) of the of the cellulose ester film represented by Formula (I) is 0 to 5 nm; and (iv) a retardation value in a thickness direction Rt(550) of the of the cellulose ester film represented by Formula (II) is −15 to 15 nm, Ro(550)=(Nx−Ny)×d Formula (I) Rt(550)={(Nx+Ny)/2−Nz}×d. Formula (II)
Claims6
A liquid crystal display comprising:
- a brightness enhancing film, polarizing plate (A), a liquid crystal cell, and polarizing plate (B), laminated in that order, wherein:
- (i) polarizing plate (A) comprises a polarizing plate protective film (A1) facing the brightness enhancing film, a polarizing plate protective film (A2) facing the liquid crystal cell, and a polarizer between two polarizing plate protective films (A1) and (A2);
- (ii) the polarizing plate protective film (A1) is a cellulose ester film comprising a material having negative birefringence;
- (iii) an in-plane retardation value Ro(550) of the cellulose ester film represented by Formula (I) is 0 to 5 nm;
- and
- (iv) a retardation value in a thickness direction Rt(550) of the cellulose ester film represented by Formula (II) is −15 to 15 nm,
- Ro(550)=(Nx−Ny)×d Formula (I)
- Rt(550)={(Nx+Ny)/2−Nz}×d Formula (II)
- wherein Nx represents a maximum in-plane refractive index;
- Ny represents a minimum in-plane refractive index;
- Nz represents a refractive index in the thickness direction;
- d represents a thickness of the cellulose ester film (nm);
- and Ro(550) and Rt(550) each represent a retardation value measured at a wavelength of 550 nm.
Dependencies are inferred from the claim text.