Light emitting diode based light source emitting collimated light
View Patent ↗A light emitting diode, a reflector and a platform are employed within a light source. The light emitting diode emits light exclusively from its side surfaces. The reflector has a parabolic reflective surface that collimates any portion of the light reflecting from the parabolic reflective surface. The platform supports a centering of the light emitting layer(s) of the light emitting diode on a focus point of the parabolic reflective surface.
1. A light source, comprising:
a light emitting diode including:
a light emitting layer operable to emit light; and
a first light absorbing layer adjacent the light emitting layer to absorb a first portion of the light emitted by the light emitting layer in a direction of the first light absorbing layer; and
a reflector having a parabolic reflective surface operable to reflect and collimate a second portion of the light emitted from the light emitting layer in a direction of the parabolic reflective surface, wherein light provided by the light source exclusively consists of the second portion of the light emitted from the light emitting layer as reflected and collimated by the reflector.
2. The light source of claim 1 , further comprising:
a platform connected to the parabolic reflective surface, the platform for supporting the light emitting diode, wherein the platform provides support for centering the light emitting layer on a focus point of the parabolic reflective surface.
3. The light source of claim 1 , further comprising:
a transparent material encapsulating the light emitting diode and the reflector, the transparent material having a planar surface wherein the second portion of the light emitted from the light emitting layer is collimated in a direction of the planar surface of the transparent material.
4. The light source of claim 1 , wherein the first light absorbing layer overlays the light emitting layer.
5. The light source of claim 4 ,
wherein the light emitting diode further includes a second light absorbing layer; and
wherein the light emitting layer overlays the second light absorbing layer.
6. The light source of claim 5 , wherein the second light absorbing layer is adjacent the light emitting layer to absorb a third portion of the light emitted by the light emitting layer in a direction of the second light absorbing layer.
7. The light source of claim 4 ,
wherein the light emitting diode further includes a light reflecting layer; and
wherein the light emitting layer overlays the light reflecting layer.
8. The light source of claim 7 , wherein the light reflecting layer is adjacent the light emitting layer to reflect a third portion of the light emitted by the light emitting layer in a direction of the light reflecting layer.
9. The light source of claim 4 ,
wherein the light emitting diode further includes a light transmitting layer; and
wherein the light emitting layer overlays the light transmitting layer.
10. The light source of claim 9 , wherein the light transmitting layer is adjacent the light emitting layer to transmit a third portion of the light emitted by the light emitting layer in a direction of the light transmitting layer.
11. The light source of claim 1 , wherein the light emitting layers overlays the first light absorbing layer.
12. The light source of claim 11 , wherein the light emitting diode further includes a second light absorbing layer overlying the light emitting layer.
13. The light source of claim 11 , wherein the light emitting diode further includes a light reflecting layer overlying the light emitting layer.
14. The light source of claim 13 , wherein the light reflecting layer is adjacent the light emitting layer to reflect a third portion of the light emitted by the light emitting layer in a direction of the light reflecting layer.
15. The light source of claim 11 , wherein the light emitting diode further includes a light transmitting layer overlying the light emitting layer.
16. The light source of claim 15 , wherein the light transmitting layer is adjacent the light emitting layer to transmit a third portion of the light emitted by the light emitting layer in a direction of the light transmitting layer.
17. A light source, comprising:
a light emitting diode including:
a light absorbing layer;
a light emitting layer overlaying the light absorbing layer, wherein the light emitting layer is operable to emit light and the light absorbing layer is adjacent the light emitting layer to absorb a first portion of the light emitted by the light emitting layer in a direction of the light absorbing layer; and
a light reflecting layer overlaying the light emitting layer; and
a reflector having a parabolic reflective surface operable to reflect and collimate a second portion of the light emitted from the light emitting layer in a direction of the parabolic reflective surface.
18. The light source of claim 17 , wherein the light reflecting layer is adjacent the light emitting layer to reflect a third portion of the light emitted by the light emitting layer in a direction of the light reflecting layer.
19. A light source, comprising:
a light emitting diode including:
a light reflecting layer;
a light emitting layer overlaying the light reflecting layer; and
a light absorbing layer overlaying the light emitting layer, wherein the light emitting layer is operable to emit light and the light absorbing layer is adjacent the light emitting layer to absorb a first portion of the light emitted by the light emitting layer in a direction of the light absorbing layer; and
a reflector having a parabolic reflective surface operable to reflect and collimate a second portion of the light emitted from the light emitting layer in a direction of the parabolic reflective surface.
20. The light source of claim 19 , wherein the light reflecting layer is adjacent the light emitting layer to reflect a third portion of the light emitted by the light emitting layer in a direction of the light reflecting layer.