Uniform flux extraction is a core problem of all edge-coupled backlight systems. In order to produce a uniform luminance Extractor density and/or shape should generally have a complex 2-D Distributions. Less known is a fact that there is a infinite number of solutions for any particular system. Indeed with a very low extractor density one can produce an even luminance already with a uniform density. However a resulting luminance would be low, as there are elevated flux losses caused by longer travel passes of photons inside a lightguide and reflection on side reflectors.
Our patented have a unique energy conservation property: light is extracted at a shortest possible distance from light sources. In this way a maximal luminance is ensured.
Our unique KEREN ™ CAD/CAM Software Package for non-imaging optics enables a fully automatical design of optimal ExFRACTOR™ features in a series of gracefully converging iterations for any extractor shape: dot, spherical & CPC lenses, prismatic & cylindrical grooves etc. The resulting pattern is then antialiased (randomized) and postprocessed for immediate production of stamper for mold cavities, chemical & laser etching, EB lithography etc.
LUMINANCE DISSTRIBUTION AT INITIAL AND FINAL ITERATIONS
NONUNIFORMITY IS IMPROVED FROM 5:1 TO BETTER THAN 1.1:1
Fully Assembled 2.2” BLU with discontinuous V-Groove extractors
LGP with non-uniformly distributed simple spherical extractors. Actual extractor size: 20-50 um
Example of Extractor distribution for ultra-thin microdisplay backlight.
Notice a unique irregular pattern, which is very different from usual
monotonically changing distributions.
Face-coupled Backlight. Complex 2-D flux Extractor Distributions (right)
Producing Uniform Luminance (left)
Stamper with complex 50um spherical and V-Groove lenses
Magnified fragment of 50um V-Groove pattern
