LIGHT EMITTING DEVICE

PROBLEM TO BE SOLVED: To provide a light emitting device having high light extraction efficiency, high luminance in a specific direction and a high light utilization factor. SOLUTION: A light extraction sheet 1 is mounted on a light extraction surface 31 of an organic EL device 3, and a prism sheet...

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Bibliographic Details
Main Authors ISHIKAWA AKIYUKI, YOSHIDA MIKIO, TSUZUKI TOSHIHIKO, TAKEUCHI NORIHITO
Format Patent
LanguageEnglish
Published 10.03.2005
Edition7
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
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Summary:PROBLEM TO BE SOLVED: To provide a light emitting device having high light extraction efficiency, high luminance in a specific direction and a high light utilization factor. SOLUTION: A light extraction sheet 1 is mounted on a light extraction surface 31 of an organic EL device 3, and a prism sheet 2 is mounted on the extraction sheet 1. The extraction sheet 1 is a member composed by forming, on the light extraction side 12, a plurality of projecting parts 13 protrusive with respect to a light introduction surface 11; the shape of each projecting parts 13 is a regular quadrangular pyramid with a bottom surface 13a set on a flat surface nearly parallel with a surface contacting the extraction surface 11. The prism sheet 2 is provided with a light entering surface 21 set nearly parallel with the extraction surface 11, and is a device composed by forming, on the light emitting side 22, a plurality of second projecting parts 23 protrusive with respect to the entering surface 21; and the shape of each projecting part 23 is a regular quadrangular pyramid. COPYRIGHT: (C)2005,JPO&NCIPI
Bibliography:Application Number: JP20030362624