Led light source with field-of-view-controlling optics

G - Physics – 09 – F

Patent

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Details

G09F 9/33 (2006.01) G02B 5/126 (2006.01) G02B 27/09 (2006.01) H01L 25/075 (2006.01) H01L 33/00 (2006.01)

Patent

CA 2401461

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 field- of-view in the vertical direction may be limited to about ~ 30° while the field-of-view is about ~ 90° in the horizontal direction.

On obtient des pixels pour un affichage vidéo de grande dimension fonctionnant avec des source lumineuses à semiconducteur tels que des diodes électroluminescentes colorées, en équipant chaque émetteur à semiconducteur coloré compris dans le pixel d'un système optique miniature renforçateur d'intensité adapté individuellement. Chacun de ces systèmes optiques miniatures comprend un ensemble de quatre réflecteurs (34) lambertiens à champ large, deux réflecteurs (36) lambertiens à champ étroit, et une lentille (38) de mise en forme de faisceau. Ce système optique miniature renforçateur d'intensité peut être conçu spécifiquement de manière à restreindre l'émission dans le champ vertical tout en fournissant une intensité à variation lambertienne dans un champ horizontal illimité. Ainsi l'angle de champ peut être limité par exemple dans la direction verticale à +/-30 DEG tandis que dans la direction horizontale, il est d'environ +/-90 DEG .

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