Light emitting diode having light emitting cell with different size and light emitting device thereof
First Claim
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1. A light emitting device, comprising:
- a plurality of light emitting cells arranged on a substrate; and
a first serial array comprising at least two electrically connected light emitting cells of the plurality of light emitting cells,wherein the at least two light emitting cells comprise semiconductor layers made of the same material, the at least two light emitting cells configured to emit light having substantially the same wavelength,wherein the at least two light emitting cells have different sizes, andwherein turn-on voltages and light emitting initiation timings of the at least two light emitting cells are different according to the different sizes.
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Abstract
There is provided a light emitting diode operating under AC power comprising a substrate; a buffer layer formed on the substrate; and a plurality of light emitting cells formed on the buffer layer to have different sizes and to be electrically isolated from one another, the plurality of light emitting cells being connected in series through metal wires.
According to the present invention, light emitting cells formed in an LED have different sizes, and thus have different turn-on voltages when light is emitted under AC power, so that times when the respective light emitting cells start emitting light are different to thereby effectively reduce a flicker phenomenon.
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19 Claims
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1. A light emitting device, comprising:
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a plurality of light emitting cells arranged on a substrate; and a first serial array comprising at least two electrically connected light emitting cells of the plurality of light emitting cells, wherein the at least two light emitting cells comprise semiconductor layers made of the same material, the at least two light emitting cells configured to emit light having substantially the same wavelength, wherein the at least two light emitting cells have different sizes, and wherein turn-on voltages and light emitting initiation timings of the at least two light emitting cells are different according to the different sizes. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 18)
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15. A light emitting device, comprising:
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a plurality of light emitting cells arranged on a substrate; and a first serial array comprising at least two electrically connected light emitting cells of the plurality of light emitting cells, wherein the at least two light emitting cells comprise a first type semiconductor layer arranged on the substrate, a second type semiconductor layer arranged between the first type semiconductor layer and the substrate, and an active layer interposed between the first type semiconductor layer and the second type semiconductor layer, wherein the at least two light emitting cells comprise the first type semiconductor layer made of the same material, the second type semiconductor layer made of the same material, and the active layer made of the same material, the at least two light emitting cells configured to emit light having substantially the same wavelength, wherein the at least two light emitting cells comprise different sizes, and wherein turn-on voltages and light emitting initiation timings of the at least two light emitting cells are different according to the different sizes. - View Dependent Claims (16, 17)
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19. A light emitting device, comprising:
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a plurality of light emitting cells arranged on a substrate; and a first serial array comprising at least two electrically connected light emitting cells of the plurality of light emitting cells, wherein the at least two light emitting cells comprise semiconductor layers made of the same material, the at least two light emitting cells configured to emit light having substantially the same wavelength, wherein the at least two light emitting cells have different sizes.
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Specification