NORMALLY-BLACK MODE TN LIQUID CRYSTAL DISPLAY

• Main Author: TOYOOKA, TAKEHIRO
• Format: Patent
• Language: English; French; Japanese
• Published: 08.03.2001
• Edition: 7
• Subjects: 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 LOGIC ELEMENTS; OPTICS; PHYSICS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

A normally-black mode TN liquid crystal display in which a drive liquid crystal cell having a pair of transparent substrates with electrodes and a liquid crystal layer having twisted nematic orientation during voltage nonapplication and provided between the pair of transparent substrates and an optical compensating film holding twisted nematic orientation and interposed between two polarizing plates, characterized in that the absolute value of the angle of twist of the optical compensating film is smaller than that of the angle of twist of the drive liquid crystal cell during voltage nonapplication. L'invention concerne un afficheur à cristaux liquides TN (du type nématique en hélice) à mode normalement noir qui comporte une cellule à cristaux liquides d'attaque à paire de substrats transparents dotés d'électrodes, et une couche de cristaux liquides à orientation nématique torsadée en non-application de tension, entre la paire de substrats, ainsi qu'un film de compensation optique tenant l'orientation nématique torsadée, deux plaques de polarisation. La valeur absolue de l'angle de torsion du film de compensation optique est inférieure à celle de l'angle de torsion de la cellule d'attaque en non-application de tension.