Light emitting device and lighting system having the same
AssigneeSeoul Semiconductor Co., Ltd.
InventorsGundula Roth, Walter Tews, Chung-Hoon Lee
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Abstract
The present invention provides a light emitting device comprising a first light emitting portion that emits white light at a color temperature of 6000K or more and a second light emitting portion that emits white light at a color temperature of 3000K or less, which include light emitting diode chips and phosphors and are independently driven. The present invention has an advantage in that a light emitting device can be diversely applied in a desired atmosphere and use by realizing white light with different light spectrums and color temperatures. Particularly, the present invention has the effect on health by adjusting the wavelength of light or the color temperature according to the circadian rhythm of humans.
Claims15
A lighting system, comprising:
- a base plate comprising cavities;
- a plurality of light emitting devices disposed in the cavities;
- and
- a molding portion,
- wherein each of the plurality of light emitting devices consists of a single first light emitting portion and a single second light emitting portion, the single first light emitting portion having a color temperature higher than that of the single second light emitting portion, wherein each of the single first light emitting portion and the single second light emitting portion comprises a light emitting diode chip and a phosphor,
- wherein only one light emitting diode chip is included in the first light emitting portion and only one light emitting diode chip is included in the second light emitting portion,
- wherein the single first light emitting portion and the single second light emitting portion are driven independently,
- wherein the single first light emitting portion and the single second light emitting portion are separated by a sidewall of one of the cavities,
- wherein the lighting system further comprises at least one controller configured to drive only the single first light emitting portion for a first period of time and drive only the single second light emitting portion for a second period of time,
- wherein the first period of time is followed by the second period of time,
- wherein the molding portion encapsulates both the single first light emitting portion and the single second light emitting portion disposed in the cavities and separated by the sidewall of one of the cavities,
- wherein the sidewall of one of the cavities forms a uniform surface with the phosphor from the single first light emitting portion and the single second light emitting portion, and
- wherein the molding portion is disposed on the uniform surface and the molding portion forms an uppermost surface that is the same height as a top surface of the base plate.
Dependencies are inferred from the claim text.