Reflective guest-host liquid-crystal display

• Main Authors: URABE; TETSUO, SHIGENO; NOBUYUKI, KATAOKA; HIDEO
• Format: Patent
• Language: English
• Published: 03.11.1998
• Edition: 6
• 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; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

A reflective guest-host liquid-crystal display of the present invention includes a pair of substrates joined together at a predetermined distance therebetween. One of the substrates is positioned at an incident side and the other is positioned at a reflection side. A guest-host liquid-crystal layer, a reflective layer, and a lambda /4 phase shifter are provided within a space formed between the pair of substrates. The guest-host liquid-crystal layer positioned adjacent to the incident-side substrate contains a dichroic dye. The lambda /4 phase shifter is provided between the guest-host liquid-crystal layer and the reflective layer and is located adjacent to the reflection-side substrate. A counter electrode and pixel electrodes are formed on the incident-side substrate and the reflection-side substrate, respectively, so as to apply a voltage to the guest-host liquid-crystal layer. The lambda /4 phase shifter is composed of a uniaxially aligned side-chain type liquid-crystal polymer having at least a biphenyl benzoate group introduced into a side chain, and thereby exhibits improved solvent resistance.