US Patent No. 10,444,421


Patent No. 10,444,421
Issue Date October 15, 2019
Title Led-based Light Fixture
Inventorship Jeroen Den Breejen, Morgan Hill, CA (US)
Yifeng Qiu, San Jose, CA (US)
Assignee Lumileds LLC, San Jose, CA (US)

Claim of US Patent No. 10,444,421

1. An illumination system, comprising:a light guide having a light emitting surface, the light emitting surface having a plurality of portions, each portion having a different light extraction pattern formed thereon, each light extraction pattern including a different plurality of light extraction features, and each light extraction pattern having a different light extraction feature density; and
a plurality of light emitting diodes (LEDs), each LED being electrically coupled to a different respective one of the plurality of portions of the light guide, such that a length of a period for which the LED is powered on during a cycle of a waveform is inversely proportional to the light extraction feature density of the respective portion's light extraction pattern.