LIQUID CRYSTAL DISPLAY DEVICE

PROBLEM TO BE SOLVED: To provide a TN type liquid crystal display device which has a wide field angle and a little color variation of black display and makes it possible to observe a color image whose contrast and hue are substantially equal over a wide visual field angle. SOLUTION: The liquid cryst...

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Bibliographische Detailangaben
Hauptverfasser:	YOSHIDA MAMORU, YOSHIDA TETSUSHI, SATO HIROMOTO
Format:	Patent
Sprache:	eng
Schlagworte:	DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING FREQUENCY-CHANGING NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICAL LOGIC ELEMENTS OPTICS PHYSICS TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF
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Beschreibung
Zusammenfassung:	PROBLEM TO BE SOLVED: To provide a TN type liquid crystal display device which has a wide field angle and a little color variation of black display and makes it possible to observe a color image whose contrast and hue are substantially equal over a wide visual field angle. SOLUTION: The liquid crystal display device is provided with: a liquid crystal element 1 provided with a liquid crystal layer 10 wherein liquid crystal molecules 11 are twisted and aligned at a twist angle of 90°; and visual field angle improving elements 14 and 15 each having a discotic liquid crystal layer 18 between front and rear polarizing plates 12 and 13 having axes of transmission orthogonally displaced to each other. The mean tilt angle α of discotic liquid crystal molecules 19 of both visual field angle improving elements 14 and 15 is set to a value satisfying α=90°-θ, where θ represents the mean tilt angle of liquid crystal molecules 11 when black display voltage is applied between electrodes 4 and 5 of the liquid crystal element 1. COPYRIGHT: (C)2005,JPO&NCIPI