OPTICAL ANISOTROPIC LAYER, OPTICAL FILM, CIRCULAR POLARIZING PLATE, AND ORGANIC ELECTROLUMINESCENCE DISPLAY DEVICE

• Main Authors: KODAMA KEISUKE, KATO SHUNYA, FURUKI YUSUKE, YOKOTA TOMOAKI, NAKAMORI TAKESHI
• Format: Patent
• Language: English; Japanese
• Published: 05.07.2022
• Subjects: ADVERTISING; BASIC ELECTRIC ELEMENTS; CRYPTOGRAPHY; DISPLAY; DISPLAYING; EDUCATION; ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; LABELS OR NAME-PLATES; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS; SEALS; SEMICONDUCTOR DEVICES; SIGNS

To provide an optical anisotropic layer whose linearity of tilt angle variable is high, and with which it is possible to suppress a change of color hue in a front and a diagonal direction when used as a circular polarizing plate in an organic EL display device, as well as an optical film, a circular polarizing plate and an organic EL display device.SOLUTION: Provided is an optical anisotropic layer formed using a liquid crystal composition that contains a liquid crystal compound. The optical anisotropic layer is created by fixing the orientation state of the liquid crystal compound, the orientation state being such that the liquid crystal compound is oriented in twisted nematic mode and the angle of optical axis of the liquid crystal compound against the surface of the optical anisotropic layer successively changes along the thickness direction. The liquid crystal composition contains at least one of the compound expressed by formula (I) and the compound expressed by formula (II) and a rod-like liquid crystal compound having a polymerizable group, that does not correspond to either formula (I) or formula (II).SELECTED DRAWING: None 【課題】本発明は、チルト角の変量の線形性が高く、円偏光板として有機ＥＬ表示装置に用いた際に正面方向および斜め方向における色味変化を抑制することができる光学異方性層、ならびに、光学フィルム、円偏光板および有機ＥＬ表示装置を提供することを課題とする。【解決手段】液晶化合物を含有する液晶組成物を用いて形成される光学異方性層であって、光学異方性層が、液晶化合物の配向状態を固定してなる層であり、配向状態が、液晶化合物が捩れ配向し、かつ、光学異方性層の表面に対する液晶化合物の光学軸の角度が厚み方向に沿って連続的に変化している配向状態であり、液晶組成物が、下記式（Ｉ）で表される化合物および下記式（ＩＩ）で表される化合物の少なくとも一方と、下記式（Ｉ）および（ＩＩ）のいずれにも該当しない、重合性基を有する棒状液晶化合物とを含有する、光学異方性層。JPEG2022099613000050.jpg10113JPEG2022099613000051.jpg1098【選択図】なし