Vehicle headlight
View Patent ↗The present invention relates to a headlight ( 10 ) for a vehicle. The headlight comprises a light emitting diode (LED) ( 12 ) including at least one LED chip ( 18 ) adapted to emit blue light and at least one overlying converter layer ( 20 ) for converting part of the blue light into yellow light, wherein part of the blue and yellow light forms bluish white light emitted in the direction of the LED normal and part of the blue and yellow light forms yellowish white light emitted at larger angles of departure, and means ( 14, 16 ) for directing at least part of the yellowish white light in a central direction of the headlight and at least part of the bluish white light in a peripheral direction of the headlight. The present invention also relates to a vehicle comprising such a headlight.
1. A headlight for a vehicle, comprising:
a light emitting diode including at least one light emitting diode chip adapted to emit blue light and at least one overlying converter layer disposed upon the light emitting diode for converting part of the blue light into yellow light, wherein part of the blue and yellow light forms bluish white light emitted in the direction of the light emitting diode normal and part of the blue and yellow light forms yellowish white light emitted at larger angles of departure from the light emitting diode normal; and
an optical device for directing at least part of the yellowish white light in a central direction of the headlight and at least part of the bluish white light in a peripheral direction of the headlight.
2. The headlight according to claim 1 , wherein the optical device is further adapted to direct any unconverted blue light emitted from the side of the light emitting diode chip in the peripheral direction of the headlight.
3. The headlight according to claim 1 , wherein the optical device comprises at least one of reflective, refractive and diffractive elements.
4. The headlight according to claim 1 , further comprising a lens covering the light emitting diode.
5. The headlight according to claim 1 , wherein the converter layer is a solid-state converter plate.
6. The headlight according to claim 1 , wherein the converter layer comprises phosphor.
7. A vehicle comprising at least one headlight according to claim 1 .
8. The vehicle according to claim 7 , wherein the central direction of the headlight is substantially parallel to a direction of the vehicle movement.
9. A headlight according to claim 4 , wherein the lens covering the light emitting diode is a silicone lens.
10. A headlight according to claim 1 , wherein the converter layer is a ceramic converter plate.
11. A headlight for a vehicle, comprising:
a light emitting diode including at least one light emitting diode chip adapted to emit a light of a first color and at least one overlying converter layer disposed upon the light emitting diode for converting part of the light of the first color into a light of a second color, wherein part of the light of the first color and part of the light of the second color forms a first combination color emitted in the direction of the light emitting diode normal and part of the light of the first color and part of the light of the second color forms a second combination color emitted at larger angles of departure from the light emitting diode normal; and
an optical device for directing at least part of the light of the first combination color in a central direction of the headlight and at least part of the light of the second combination color in a peripheral direction of the headlight.
12. The headlight according to claim 11 , wherein the optical device is further adapted to direct any unconverted blue light emitted from the side of the light emitting diode chip in the peripheral direction of the headlight.
13. The headlight according to claim 11 , wherein the optical device comprises at least one of reflective, refractive and diffractive elements.
14. A headlight according to claim 11 , further comprising a lens covering the light emitting diode.
15. A headlight according to claim 11 , wherein the converter layer is a solid-state converter plate.
16. A headlight according to claim 11 , wherein the converter layer comprises phosphor.
17. A vehicle comprising at least one headlight according to claim 11 .
18. The vehicle according to claim 17 , wherein the central direction of the headlight substantially parallel to a direction of the vehicle movement.
19. A headlight according to claim 14 , wherein the lens covering the light emitting diode is a silicone lens.
20. A headlight according to claim 11 , wherein the converter layer is a ceramic converter plate.