LED device having diffuse reflective surface
View Patent ↗A LED device is provided having a diffuse reflective surface which includes an LED chip emitting light, a reflector cup having the LED chip arranged at a bottom surface thereof and having an angled surface which diffusely reflects the light emitted by the LED chip, and a light conversion material provided in the reflector cup for converting the light emitted by the LED chip into visible light rays. The light-conversion material is spatially separated from the LED chip by a length equal or greater than the maximum length of the LED chip.
1. An LED device having a diffuse reflective surface, the LED device comprising:
an LED chip which emits light:
a reflector cup having the LED chip arranged at a bottom surface thereof and having an angled inner surface, wherein the bottom surface and the angled inner surface surround the LED chip and diffusely reflect light from substantially all of the bottom surface and the angled inner surface; and
a light conversion material provided in the reflector cup for converting the light emitted by the LED chip into visible light, wherein the light conversion material is a phosphor that is excited by the light emitted from the LED chip to emit visible light, and wherein the phosphor forms a phosphor layer in an upper portion of the reflector cup to be separated from the LED chip, and wherein the phosphor layer is separated from the LED chip by a vertical distance equal to or greater than a maximum length of the LED chip.
2. The LED device as claimed in claim 1 , wherein the angled inner surface and the bottom surface are processed to be rough.
3. The LED device as claimed in claim 2 , wherein the amount of light reflected at the angled inner surface and the bottom surface decreases as a reflection angle with respect to a perpendicular direction to the angled inner surface and the bottom surface increases regardless of an incident angle of the light to the angled inner surface and the bottom surface.
4. The LED device as claimed in claim 1 , wherein the phosphor is a plurality of phosphors that form a plurality of visible color rays, and the phosphors are mixed with one another.
5. The LED device as claimed in claim 1 , wherein the phosphor is a plurality of phosphors that form a plurality of visible color rays, and the phosphors are stacked in multiple layers.
6. The LED device as claimed in claim 1 , wherein a convex portion is formed on an upper surface of the phosphor layer.
7. The LED device as claimed in claim 6 , wherein the convex portion has a hemispheric shape.
8. The LED device as claimed in claim 1 , wherein the LED chip is formed of III-V group nitride-based semiconductor compounds.