POLARIZING PLATE AND DISPLAY DEVICE

• Main Authors: JINNO TORU, SUMIYOSHI SUZUKA, YANAGI TOSHIKI
• Format: Patent
• Language: English; Japanese
• Published: 11.06.2020
• Subjects: BASIC ELECTRIC ELEMENTS; ELECTRIC HEATING; ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PERFORMING OPERATIONS; PHYSICS; SEMICONDUCTOR DEVICES; TRANSPORTING

To provide a circularly polarizing plate having a retardation film, which shows a little change in reflection hues before and after the film is left in a high temperature environment.SOLUTION: The circularly polarizing plate has a polarizing plate and a retardation film, in which the retardation film includes a retardation layer. The retardation film has a piercing elastic modulus of 15 gf/mm or more, where the piercing elastic modulus is an elastic modulus measured by a test using a needle having a tip with a diameter of 1 mmφ and 0.5R at a piercing speed of 0.33 cm/sec.SELECTED DRAWING: Figure 1 【課題】本発明の目的は、位相差フィルムを備える円偏光板であって、高温環境下に置く前後で反射色相の変化が小さい円偏光板を提供することである。【解決手段】偏光板と位相差フィルムとを有する円偏光板であって、前記位相差フィルムは位相差層を含み、前記位相差フィルムは、突刺し弾性率が１５ｇｆ／ｍｍ以上であり、前記突刺し弾性率は、先端径が１ｍｍφ、０．５Ｒであるニードルを用いて、突刺し速度が０．３３ｃｍ／秒である試験で測定される弾性率である円偏光板。【選択図】図１