LIQUID CRYSTAL ELEMENT AND LIGHTING DEVICE

• Main Authors: IWAMOTO NOBUHISA, IDO HIROAKI, KAMEI MATSUO
• Format: Patent
• Language: English; Japanese
• Published: 13.12.2022
• Subjects: BLASTING; 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; HEATING; LIGHTING; MECHANICAL ENGINEERING; NON-LINEAR OPTICS; NON-PORTABLE LIGHTING DEVICES; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; SYSTEMS THEREOF; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLEEXTERIORS; WEAPONS

To improve the brightness of irradiation light in a lighting device, etc., that uses a liquid crystal element.SOLUTION: Provided is a liquid crystal element including: a first and a second substrate; a liquid crystal layer composed using a liquid crystal material of negative dielectric anisotropy that contains a chiral material and substantially vertically oriented having a pretilt angle of less than 90°; a first polarizing plate arranged on the first substrate side; and a second polarizing plate arranged on the second substrate side. The first and second polarizing plates have their mutual transmission axes substantially orthogonally arranged. When a voltage 2.5 times a threshold is applied to the liquid crystal layer, the angle formed by the first and second orientation directions that are the actual orientation directions in the interface between the liquid crystal layer and each of the first and second substrates is 70° to 110° inclusive, the angle formed by the transmission axis of the first polarizing plate and the first orientation direction is 110° or less to 70° or greater, and the angle formed by the transmission axis of the second polarizing plate and the second orientation direction is 110° or less to 70° or greater.SELECTED DRAWING: Figure 1 【課題】液晶素子を用いる照明装置等における照射光の明るさを向上させること。【解決手段】第１基板及び第２基板と、カイラル材を含有する負の誘電率異方性の液晶材料を用いて構成され、９０°未満のプレティルト角を有して略垂直配向している液晶層と、前記第１基板側に配置された第１偏光板と、前記第２基板側に配置された第２偏光板と、を含み、前記第１偏光板と前記第２偏光板は、互いの透過軸を略直交に配置されており、前記液晶層へ閾値の２．５倍以上の電圧が印加されたときに前記液晶層と前記第１基板及び前記第２基板の各々との界面における実質的な配向方位である第１配向方位及び第２配向方位とのなす角度が７０°以上１１０°以下であり、前記第１偏光板の透過軸と前記第１配向方位とのなす角度が１１０°以下７０°以上であり、かつ前記第２偏光板の透過軸と前記第２配向方位とのなす角度が１１０°以下７０°以上である、液晶素子である。【選択図】図１