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:
Aug. 15, 2017
Filed:
Jun. 15, 2016
Rockwell Collins, Inc., Cedar Rapids, IA (US);
Albert N. Stuppi, Springville, IA (US);
Rockwell Collins, Inc., Cedar Rapids, IA (US);
Abstract
A tunable light generating assembly uses ultraviolet and blue light emitting diodes to pump red and green quantum dots in a quantum dot layer to generate white light. A dielectric mirror substrate having a wavelength selective reflectance is configured to reflect ultraviolet wavelengths, and to pass blue and longer wavelengths. The portion of the ultraviolet light that is not absorbed in the quantum dot layer is reflected rather than transmitted, where it has another chance to be absorbed in the quantum dot layer, thereby increasing the overall conversion efficiency. The increased energy associated with the ultraviolet light further results in greater conversion efficiency in the quantum dot layer. The ultraviolet and blue LEDs may be driven by an electronic circuit that varies the amount of power applied to each LED to control the brightness and color balance of the generated white light.