Twisted nematic liquid crystal display device with retardation plates having phase axis direction within 15amp;deg; of alignment direction

摘要

A liquid crystal display device includes first and second substrates bonded with each other with an annular seal sandwiched therebetween. A liquid crystal is filled in a sealed space between the substates, molecules of which are so aligned that they are twisted at 90°. The value of a product &Dgr;nd of the refractive-index anisotropy . DELTA.n of a LC layer and the LC layer thickness d falls from 350 nm to 700 nm. A first electrode and a first aligning film executed by an aligning treatment in a predetermined first direction and covering the electrode are formed on an inner surface of the first substrate. Second electrodes and a second aligning film executed by an aligning treatment in a second direction different at 90° from the first direction and covering the electrode are formed on an inner surface of the second substrate. A pair of polarizing plates are disposed outsides of the both substrates, so that a polarizing axis of one plate is directed toward a direction perpendicular to or parallel to the first direction and that of another plate is directed to cross at 90° the former axis. A retardation plate is disposed between the polarizing plates, so that a direction of a delayed or advanced phase axis thereof is equal to or different in a range of .+-.15° from the first direction. The product &Dgr;nd of the retardation plate falls from 300 nm to 600 nm.