OPTICAL FILM, OPTICAL LAMINATE, AND FLEXIBLE IMAGE DISPLAY DEVICE

• Main Authors: FUKUI HITOSHI, OMATSU KAZUYOSHI, JANG JU-YEUL, KARASAWA MASAYOSHI, YANAGI TOSHIKI
• Format: Patent
• Language: English; Japanese
• Published: 29.07.2021
• Subjects: ADVERTISING; CHEMISTRY; COMPOSITIONS BASED THEREON; COMPOSITIONS OF MACROMOLECULAR COMPOUNDS; CRYPTOGRAPHY; 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; DISPLAY; DISPLAYING; EDUCATION; FREQUENCY-CHANGING; LABELS OR NAME-PLATES; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; METALLURGY; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICAL LOGIC ELEMENTS; OPTICS; ORGANIC MACROMOLECULAR COMPOUNDS; PERFORMING OPERATIONS; PHYSICS; SEALS; SIGNS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; THEIR PREPARATION OR CHEMICAL WORKING-UP; TRANSPORTING; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS

To provide an optical film which offers superior visibility when used appropriately as an optical film in an image display device.SOLUTION: An optical film provided herein contains at least one compound selected from a group consisting of polyimides, polyamides and polyamide-imides, and satisfies formula (1): 1.1≤transmission b*-reflection (SCE) b*≤15 ...(1), [where, in the formula (1), transmission b* represents b* of light transmitted through the optical film in an L*a*b* color system and reflection (SCE) b* represents b* of light reflected at the optical film in the L*a*b* color system derived by a SCE method].SELECTED DRAWING: None 【課題】画像表示装置における光学フィルムとして好適に使用された場合に、優れた視認性を有する光学フィルムを提供することを目的とする。【解決手段】ポリイミド、ポリアミド及びポリアミドイミドからなる群から選択される少なくとも１種を含む光学フィルムであって、式（１）１．１≦透過ｂ＊−反射（ＳＣＥ）ｂ＊≦１５・・・（１）［式（１）中、透過ｂ＊は該光学フィルムを透過した光のＬ＊ａ＊ｂ＊表色系におけるｂ＊を示し、反射（ＳＣＥ）ｂ＊はＳＣＥ方式で求められる該光学フィルムを反射した光のＬ＊ａ＊ｂ＊表色系におけるｂ＊を示す］を満たす、光学フィルム。【選択図】なし