Light emitting diode having light emitting cell with different size and light emitting device thereof
AssigneeSeoul Opto Device Co., Ltd.
InventorsJun Hee Lee, Jong Kyu Kim, Yeo Jin Yoon
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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.
Claims11
A nitride-based light emitting diode (LED) configured to operate under alternating current (AC) power, comprising:
- a substrate;
- and
- a plurality of light emitting cells arranged on the substrate, the light emitting cells comprising different sizes and different current densities when subjected to the AC power and being all arranged on the substrate and being spaced apart from one another, the plurality of light emitting cells being connected in series through metal wires.
A light emitting device comprising a plurality of nitride-based LEDs configured to operate under alternating current (AC) power,
- wherein each LED comprises:
- a substrate;
- and
- a plurality of light emitting cells arranged on the substrate, the plurality of light emitting cells comprising different sizes and different current densities when subjected to the AC power and being all arranged on the substrate, being spaced apart from one another, and being connected in series through metal wires.
An alternating current (AC) powered nitride-based light emitting diode (LED), comprising:
- a substrate;
- and
- a plurality of light emitting cells, arranged on the substrate and serially connected by wires, and comprising a plurality of sizes being all arranged on the substrate to create variations in the current density of each light emitting cell and the duration of light emitted from each light emitting cell when the plurality of cells are subjected to AC power, and
- wherein the specific choice of the plurality of sizes of the light emitting cells and their arrangement permit adjacent cells of differing polarity to remain illuminated for varying duration when the AC power is applied, thereby reducing the flicker associated with the application of AC power to adjacent light emitting cells of differing polarity.
Dependencies are inferred from the claim text.