The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 17, 2002
Filed:
Sep. 08, 2000
Sey-Shing Sun, Beaverton, OR (US);
Michael S. Bowen, Beaverton, OR (US);
Planner Systems, Inc., Beaverton, OR (US);
Abstract
A light emitting phosphor material for an alternating current thin-film electroluminescent device that includes the phosphor material sandwiched between a pair of dielectric layers. The phosphor material comprises a first layer having a thickness greater than 600 nanometers wherein the first phosphor material has a luminance output at 25 degrees C. and a decreased luminance output at 50 degrees C. greater than 20 percent of the luminance output at 25 degrees C. The phosphor material comprises a second phosphor layer overlaying the first phosphor layer having a thickness less than 400 nanometers wherein the decreased luminance output at 50 degrees C. is less than 20 percent with the second phosphor layer.