LIGHT EXTRACTION FILM FOR ELECTROLUMINESCENCE ELEMENTS, AND SURFACE EMITTER

• Main Author: MIZUHARA KAZUMI
• Format: Patent
• Language: English; Japanese
• Published: 09.03.2017
• 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; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS; SEMICONDUCTOR DEVICES

PROBLEM TO BE SOLVED: To provide an electroluminescence (EL) element light extraction film which provides superior light extracting efficiency and reduces glare by suppressing light in a large exit angle range when used together with an EL element to constitute a surface light emitter, and to provide a surface emitter having the same.SOLUTION: An electroluminescence element light extraction film 10 has one surface provided with an optical functional layer 13 having a number of protrusions 11a formed on an outer surface thereof. On the outer surface of the optical functional layer 13, a reflective layer 11b is formed only on a surface of each protrusion 11a, the reflective layer 11b extending from a base of the protrusion 11a toward a tip end side thereof to a height that is 30-95% of a height of the protrusion 11a.SELECTED DRAWING: Figure 1 【課題】エレクトロルミネッセンス（ＥＬ）素子とともに面発光体を構成したときに、光取り出し効率に優れ、かつ、出射角度の大きい領域の光が抑制され、グレアを低減できるＥＬ素子用光取り出しフィルムと、該フィルムを備えた面発光体を提供する。【解決手段】一方の面に光学機能層１３を有し、該光学機能層１３の外側面に多数の凸部１１ａが形成されたエレクトロルミネッセンス素子用光取り出しフィルム１０であって、光学機能層１３の外側面には、凸部１１ａの表面のみに、該凸部１１ａの基端部から先端部側に向かって反射層１１ｂが形成され、該反射層１１ｂの高さは、凸部１１ａの高さの３０〜９５％である。【選択図】図１