DISPLAY DEVICE

• Main Authors: NENDAI KENICHI, YAMADA JIRO, TERAMOTO KAZUMASA
• Format: Patent
• Language: English; Japanese
• Published: 19.09.2019
• 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; PHYSICS; SEALS; SEMICONDUCTOR DEVICES; SIGNS

To provide a display device capable of improving light extraction efficiency, while stabilizing brilliance.SOLUTION: A display device includes a board, a first insulator film, a first electrode, a second insulator film, a luminous layer, and a second electrode. The first insulator film includes at least one recess including a first bottom face and an inclined first lateral face. The first electrode is provided on the recess. The second insulator film is provided on the first electrode. The luminous layer includes a second bottom face brought into contact with a part of the first electrode, and an inclined second lateral face. The second electrode is provided on the luminous layer. The recess is deeper than a thickness of the luminous layer, and the second insulator film is thicker than the depth of the recess. The second insulator film includes an inclined third lateral face having an angle α for a face parallel with the first bottom face, and when a refraction factor of the luminous layer is n1, and a refraction factor of the second insulator film is n2, the angle α satisfies α>arcsin(n2/n1).SELECTED DRAWING: Figure 3 【課題】本実施形態は、輝度を安定化したまま光の取り出し効率を向上することが可能な表示装置を提供する。【解決手段】本実施形態に係る表示装置は、基板と、第１の絶縁膜と、第１の電極と、第２の絶縁膜と、発光層と、第２の電極とを備えている。第１の絶縁膜は、第１の底面と傾斜した第１の側面とを含む少なくとも１つの凹部を含む。第１の電極は、凹部上に設けられている。第２の絶縁膜は、第１の電極上に設けられている。発光層は、第１の電極の一部に接触された第２の底面と、第２の絶縁膜上に設けられた傾斜した第２の側面とを含む。第２の電極は、発光層上に設けられている。凹部の深さは、発光層の膜厚より深く、第２の絶縁膜の膜厚は凹部の深さより厚い。第２の絶縁膜は、第１の底面と平行する面となす角度がαである傾斜した第３の側面を含み、発光層の屈折率がｎ１であり、第２の絶縁膜の屈折率がｎ２である場合に、角度αは、α＞ａｒｃｓｉｎ（ｎ２／ｎ１）を満たす。【選択図】図３