US 20020057061A1
(19) United States
(12) Patent Application Publication (io) Pub. No.: US 2002/0057061 Al
Mueller et al. (43) Pub. Date: May 16,2002
(54) MULTICOLORED LED LIGHTING METHOD AND APPARATUS
(76) Inventors: George G. Mueller, Boston, MA (US);
IhorA. Lys, Boston, MA (US)
Correspondence Address:
WOLF GREENFIELD & SACKS, PC
FEDERAL RESERVE PLAZA
600 ATLANTIC AVENUE
BOSTON, MA 02210-2211 (US)
(21) Appl. No.: 09/971,367
(22) Filed: Oct. 4, 2001
Related U.S. Application Data
(63) Continuation of application No. 09/669,121, filed on Sep. 25, 2000, which is a continuation of application
No. 09/425,770, filed on Oct. 22,1999, now patented, which is a continuation of application No. 08/920, 156, filed on Aug. 26, 1997, now patented.
Publication Classification
(51) Int. CI.7 H05B 37/02
(52) U.S. CI 315/291; 315/219
(57) ABSTRACT
The systems and methods described herein relate to LED systems capable of generating light, such as for illumination or display purposes. The light-emitting LEDs may be controlled by a processor to alter the brightness and/or color of the generated light, e.g., by using pulse-width modulated signals. Thus, the resulting illumination may be controlled by a computer program to provide complex, predesigned patterns of light in virtually any environment.
