Patent ID: 6341002
Filing Date: 2002-01-22
Classification: G02F

Abstract:
A liquid crystal display device, comprising: a first substrate, a second substrate, a liquid crystal layer interposed between the first substrate and the second substrate, and a plurality of pixel regions defined by a pair of electrodes for applying a voltage to the liquid crystal layer,wherein each of the plurality of pixel regions includes a reflection region and a transmission region, and the liquid crystal layer is made of a liquid crystal material having positive dielectric anisotropy, the device further including: a first polarizing element provided on the first substrate opposite to the liquid crystal layer; a second polarizing element provided on the second substrate opposite to the liquid crystal layer; a first phase difference compensator provided between the first polarizing element and the liquid crystal layer; and a second phase difference compensator provided between the second polarizing element and the liquid crystal layer, a twist angle &thgr;t of the liquid crystal layer being in a range of 0Â° to 90Â°, wherein retardation Rd and the twist angle &thgr;t in a visible light region of the liquid crystal layer in the reflection region are in ranges within curves respectively represented by the following Formulae (1) and (2), and Formulae (3) and (4), in ranges within curves respectively represented by the following Formulae (5) and (6) and Formulae (7) and (8) at the twist angle &thgr;t in a range of 0Â°&lE;&thgr;t&lE;54.3Â°, and in ranges within curves respectively represented by the following Formulae (5) and (8) at the twist angle &thgr;t in a range of 54.3Â°t&lE;90Â°, and wherein the retardation Rd and the twist angle &thgr;t in a visible light region of the liquid crystal layer in the transmission region are in ranges within curves respectively represented by the following Formulae (9) and (10) and Formulae (11) and (12): Rd=âˆ’0.0043Â·&thgr;t2âˆ’0.065Â·&thgr;t+1011.8â€ƒâ€ƒ(1) Rd=âˆ’0.0089Â·&thgr;t2+0.1379Â·&thgr;t+914.68â€ƒâ€ƒ(2) Rd=âˆ’0.0015Â·&thgr;t2âˆ’0.1612Â·&thgr;t+737.29â€ƒâ€ƒ(3) Rd=âˆ’0.0064Â·&thgr;t2âˆ’0.0043Â·&thgr;t+640.65â€ƒâ€ƒ(4) Rd=âˆ’0.0178Â·&thgr;t2+0.2219Â·&thgr;t+458.92â€ƒâ€ƒ(5) Rd=âˆ’0.0405Â·&thgr;t2+0.4045Â·&thgr;t+364.05â€ƒâ€ƒ(6) â€ƒRd=0.0347Â·&thgr;t2âˆ’0.4161Â·&thgr;t+186.53â€ƒâ€ƒ(7)Rd=0.0098Â·&thgr;t2âˆ’0.1912Â·&thgr;t+89.873â€ƒâ€ƒ(8) Rd=âˆ’0.0043Â·&thgr;t2âˆ’0.065Â·&thgr;t+995.66â€ƒâ€ƒ(9) Rd=âˆ’0.0058Â·&thgr;t2âˆ’0.0202Â·&thgr;t+665.8â€ƒâ€ƒ(10) Rd=âˆ’0.0248Â·&thgr;t2+0.6307Â·&thgr;t+439.58â€ƒâ€ƒ(11) Rd=0.0181Â·&thgr;t2âˆ’0.6662Â·&thgr;t+109.51â€ƒâ€ƒ(12).