AC WHITE LED DEVICE
First Claim
1. A white Light-Emitting Diode (LED) device unit, said LED device comprising:
- an LED chip and a light emitting material capable of emitting light when excited by said LED chip, said LED chip comprising a single light emitting PN junction, and wherein said LED chip is driven by Alternating Current (AC) with a frequency of not more than 100 Hz, wherein a luminous lifetime of the light emitting material is 1 to 100 ms, wherein a luminous brightness under a non-constant current condition is compensated for through afterglow of the light emitting material, and wherein light emitted by the LED chip is mixed with light emitted by the light emitting material to form white light.
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Accused Products
Abstract
An Alternate Current (AC) white Light-Emitting Diode (LED) device is provided, which belongs to the technical field of white LED manufacturing. The problem to be solved by the present invention is to low-costly overcome a series of deficiencies such as the stroboflash of an AC driven LED, and the heat dissipation difficulty caused by an integrated packaging of multiple LEDs. A white LED unit includes an LED chip and a light emitting material that can emit light when being excited by the LED chip. The luminous lifetime of the light emitting material is 1-100 ms. The LED chip only comprises one PN junction. The light emitted by the LED chip is mixed with the light emitted by the light emitting material to form white light. The white LED unit is driven by AC with a frequency not more than 100 Hz. The white LED device of prevent invention uses the single PN junction chip, rather than the prior integrated packaged AC multi-LED chip.
19 Citations
20 Claims
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1. A white Light-Emitting Diode (LED) device unit, said LED device comprising:
- an LED chip and a light emitting material capable of emitting light when excited by said LED chip, said LED chip comprising a single light emitting PN junction, and wherein said LED chip is driven by Alternating Current (AC) with a frequency of not more than 100 Hz, wherein a luminous lifetime of the light emitting material is 1 to 100 ms, wherein a luminous brightness under a non-constant current condition is compensated for through afterglow of the light emitting material, and wherein light emitted by the LED chip is mixed with light emitted by the light emitting material to form white light.
- View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 18, 19)
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10. A method of generating white light using a light emitting diode (LED) chip, said method comprising:
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providing a LED chip comprising a single PN junction; associating said LED chip with a light emitting material which is capable of emitting light when excited by said LED chip, and wherein said light emitting material comprises a luminous lifetime of 1 to 100 ms and wherein said light emitting material comprises a luminous brightness under a non-constant current condition that is compensated for by an afterglow of said light emitting material; exciting said LED chip using an alternating current (AC) using a frequency of no more than 100 Hz; and mixing light emitted by said LED chip with light emitted by said light emitting material to form white light. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 20)
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Specification