LED lighting devices incorporating waveguides
View Patent ↗A LED lighting device includes at least one waveguide element and multiple light-emitting sources such as LEDs or LED packages, which may be optically coupled though different light entry regions to the at least one waveguide. Multiple light solid state sources may be arranged in strips. A waveguide system includes first and second body structures each positioned to illuminate at least a portion of a target surface. One or more waveguides may be arranged to illuminate a LCD panel.
1. A LED lighting device comprising:
at least one waveguide element comprising a plurality of light entry regions;
a first light-emitting source comprising at least one first LED positioned to emit light into the at least one waveguide element at a first light entry region of the plurality of light entry regions; and
a second light-emitting source comprising at least one second LED positioned to emit light into the at least one waveguide element at a second light entry region of the plurality of light entry regions;
wherein the first light-emitting source and the second light-emitting source are arranged to illuminate different regions of a target surface; and
wherein the at least one waveguide element comprises a generally planar body structure portion including a major light emitting surface and including at least one waveguide extension joined to the body structure portion and that is non-coplanar with the body structure portion, and wherein any of the first light-emitting source and the second light-emitting source is coupled to the at least one waveguide extension.
2. A LED lighting device according to claim 1 , wherein the first light-emitting source comprises a plurality of first LEDs arranged in a first strip, and wherein the second light-emitting source comprises a plurality of second LEDs arranged in a second strip.
3. A LED lighting device according to claim 1 , wherein the at least one first LED includes multiple LEDs arranged in a first plurality of LED packages, and wherein the at least one second LED includes multiple LEDs arranged in a second plurality of LED packages.
4. A LED lighting device according to claim 3 , wherein each LED package of the first plurality of LED packages and each LED package of the second plurality of LED packages includes at least one of the following features: a diffuser, a reflector, a lens, an electrostatic discharge diode, and multiple LEDs.
5. A LED lighting device according to claim 1 , wherein each of the first light entry region and the second light entry region is disposed at a different location on the at least one waveguide element selected from: a top edge of the at least one waveguide element, a bottom edge of the at least one waveguide element, a first side edge of the at least one waveguide element, a second side edge of the at least one waveguide element, and a back side of the at least one waveguide element.
6. A LED lighting device according to claim 1 , wherein the at least one waveguide element comprises at least one hole or recess arranged to receive at least one of the first light-emitting source and the second light-emitting source.
7. A LED lighting device according to claim 1 , wherein the target surface comprises an illuminated surface of a liquid crystal display panel.
8. A LED lighting device according to claim 1 , wherein any of the first light-emitting source and the second light-emitting source comprises at least one LED adapted to emit white light.