Light extraction block with curved surface

Patent · Tue Mar 22 00:00:00 EDT 2016

OSTI ID:1243313

Levermore, Peter; Krall, Emory; Silvernail, Jeffrey; Rajan, Kamala; Brown, Julia J.

Light extraction blocks, and OLED lighting panels using light extraction blocks, are described, in which the light extraction blocks include various curved shapes that provide improved light extraction properties compared to parallel emissive surface, and a thinner form factor and better light extraction than a hemisphere. Lighting systems described herein may include a light source with an OLED panel. A light extraction block with a three-dimensional light emitting surface may be optically coupled to the light source. The three-dimensional light emitting surface of the block may includes a substantially curved surface, with further characteristics related to the curvature of the surface at given points. A first radius of curvature corresponding to a maximum principal curvature k.sub.1 at a point p on the substantially curved surface may be greater than a maximum height of the light extraction block. A maximum height of the light extraction block may be less than 50% of a maximum width of the light extraction block. Surfaces with cross sections made up of line segments and inflection points may also be fit to approximated curves for calculating the radius of curvature.

• Research Organization: Universal Display Corporation, Ewing, NJ (United States)
• Sponsoring Organization: USDOE
• DOE Contract Number: FC26-08NT01585
• Assignee: Universal Display Corporation (Ewing, NJ)
• Patent Number(s): 9,293,734
• Application Number: 12/978,213
• OSTI ID: 1243313
• Resource Relation: Patent File Date: 2010 Dec 23
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS