LED LIGHT SOURCE WITH FIELD-OF-VIEW-CONTROLLING OPTICS

摘要

Pixels for a large video display which employs solid-state emitters, such as colored light emitting diodes, as light source are formed by outfitting each colored solid state emitter within the pixel with an individually tailored miniature intensity-enhancing optical system. Each of these miniature optical systems comprises a set of four wide field-of-view Lambertian reflectors (34), a pair of narrow field-of-view Lambertian reflectors (36), and a beam- shaping lens (38). The miniature intensity-enhancing optical system can be specifically designed to restrict emission in the vertical field-of-view, while providing a Lambertian intensity dependence throughout an unrestricted horizontal view. For example, the fiel d- of-view in the vertical direction may be limited to about ~ 30.degree. while the field-of-view is about ~ 90.degree. in the horizontal direction.