Patent ID: 9112185
Filing Date: 2015-08-18
Classification: G02B,H01L,H05B

Abstract:
1. An EL panel comprising: a light-transmissive substrate; an EL element comprising a light-emitting medium layer interposed between a cathode and an anode, the EL element being provided on a first surface of the light-transmissive substrate; and a protection sheet having a first surface that is provided on a second surface of the light-transmissive substrate and a second surface that is opposite of the first surface, the second surface of the protection sheet forming an outermost surface of the EL panel from which a light emitted from the light-emitting medium layer is output, the protection sheet being configured to suppress heat transfer that occurs when a heat transfer body is in contact with the outermost surface of the EL panel, wherein a plurality of prism portions are periodically arranged to extend in one direction or in two directions from the second surface of the protection sheet, a plurality of rounded convex portions are arranged at random on the second surface of the protection sheet, each of the rounded convex portions having an uneven surface, each of the convex portions has an apex that is a center point of a cross-section farthest from a bottom surface where the cross-section is parallel to the bottom surface of the convex portion and the area becomes smaller in a direction from the bottom surface to a top portion thereof, and where the height of the apex is represented as Tc, the distance between the apexes of adjacent convex portions is represented as Bc, and the height of the prism portion is represented as Tp, the following formula is satisfied: