11 Jun 2003
The pick of this week’s patent applications including a way to eliminate dark spots in OLEDs.
• Title: Organic light emitting diode (OLED)
Applicant: Institute of Materials Research and Engineering; National University of Singapore, Singapore
International application number: WO 03/047317
The non-emissive “dark spots” on OLEDs could soon be a thing of the past thanks to a design presented in patent application WO 03/047317. The new OLED design contains a number of protective barriers interspersed between the layers of the OLED structure. Made from an organic polymer, these barriers can resist permeation by oxygen and moisture as well as inhibiting metal migration.
• Title: System and technique for detecting the presence of foreign material
Applicant: Battelle Memorial Institute, US
International application number: WO 03/046548
Patent application WO 03/046548 describes an LED-based system for detecting foreign material in food. The source illuminates the food from behind using a planar array of LEDs emitting between 500 and 600nm. “An image of the food stream is captured and the presence of foreign material is determined when a portion of the detected image exceeds a predetermined threshold,” say the authors. They add that the method is particularly useful for detecting traces of bone in chicken meat.
• Title: System and method for displaying physical objects in space
Applicant: Total Gizmo, Inc, US
International application number: WO 03/046641
A US company is trying to patent a projection system that allows viewers to see images in three dimensions. The authors say their system uses optical assemblies which projects an image of an object into a viewable volume of space. “The invention provides environmental visual cues to promote perception of a three-dimensional image,” say the authors.
Jacqueline Hewett is news reporter on Optics.org and Opto & Laser Europe magazine.