METHOD FOR EVALUATING BENDING DURABILITY OF OPTICAL LAMINATE, AND OPTICAL LAMINATE

• Main Authors: LIM MYEONHO, JANG JU-YEUL, YANAGI TOSHIKI
• Format: Patent
• Language: English; Japanese
• Published: 01.11.2023
• Subjects: INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; MEASURING; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PERFORMING OPERATIONS; PHYSICS; TESTING; TRANSPORTING

To provide a method for evaluating bending durability of an optical laminate used in a slide type screen extension display.SOLUTION: A method comprises: a bending step of bringing an optical laminate into a first bent state; a first movement step of bringing the optical laminate into a second bent state; a second movement step of changing the optical laminate from the second bent state to the first bent state; a measurement step of measuring horizontal stress Fh(gf) and vertical stress Fv(gf) generated in the optical laminate when the optical laminate is brought into the first bent state, after repeating the first movement step and the second movement step; and an evaluation step of evaluating the bending durability of the optical laminate based on an A value obtained according to the following formula: A=(Fh2+Fv2)1/2/a.SELECTED DRAWING: Figure 1 【課題】スライド式画面拡張ディスプレイに用いる光学積層体の屈曲耐久性を評価する方法を提供すること。【解決手段】光学積層体を第１屈曲状態とする屈曲工程、光学積層体を第２屈曲状態とする第１移動工程、光学積層体を第２屈曲状態から第１屈曲状態とする第２移動工程、第１移動工程および第２移動工程を繰り返し行った後、第１屈曲状態とした時の光学積層体に生じる水平方向の応力Ｆｈ（ｇｆ）と鉛直方向の応力Ｆｖ（ｇｆ）とを測定する測定工程、式：Ａ＝（Ｆｈ２＋Ｆｖ２）１／２／ａに従って得られるＡ値に基づいて光学積層体の屈曲耐久性を評価する評価工程を含む方法。【選択図】図１