Ornamental lighting system
Traffic-related message signal using light-emitting diodes
Method for adjusting video signal gain
Controlled lighting system
LED traffic signal light with automatic low-line voltage compensating circuit
LED traffic light and method of manufacture and use thereof
Light emitting artwork Patent #: 6058634
ApplicationNo. 541672 filed on 03/31/2000
US Classes:340/815.67, Plural340/815.45, Using light emitting diodes340/815.65, Multiple colors340/907, TRAFFIC CONTROL INDICATOR362/231Different wavelengths
ExaminersPrimary: Pham, Hoa Q.
Foreign Patent References
International ClassG08B 005/36
AbstractA traffic signal head uses a plurality of LED light sources mounted in one or more containment volumes in a housing. One version uses identical three-color LED light sources distributed through the containment volume: each source having a red light generating element, a yellow light generating element, and a green light generating element. A second version uses identical two-color LED light sources distributed through the containment volume, each source having a red LED light generating element and a green LED light generating element. For the second version, activation circuitry enables individual activation of the red LED elements to produce red signals, individual activation of the green LED elements to produce green signals, and concurrent activation of both types of LED elements to produce yellow signals. Both versions can be electrically configured to display any of the three colors, as well as special symbols-such as directional arrows.