LIGHT EMITTING DEVICE FOR AC POWER OPERATION
First Claim
1. A light emitting device, comprising:
- a light emitting cell array configured to receive an input voltage and comprising a plurality of light emitting cells connected in series on a substrate,the plurality of light emitting cells to emit light comprising a periodically changing luminous intensity in response to the input voltage, the input voltage to periodically change with a period, and a minimum value of the periodically changing luminous intensity is substantially greater than 0.
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Accused Products
Abstract
Disclosed is an improved light-emitting device for an AC power operation. A conventional light emitting device employs an AC light-emitting diode having arrays of light emitting cells connected in reverse parallel. The arrays in the prior art alternately repeat on/off in response to a phase change of an AC power source, resulting in short light emission time during a ½ cycle and the occurrence of a flicker effect. An AC light-emitting device according to the present invention employs a variety of means by which light emission time is prolonged during a ½ cycle in response to a phase change of an AC power source and a flicker effect can be reduced. For example, the means may be switching blocks respectively connected to nodes between the light emitting cells, switching blocks connected to a plurality of arrays, or a delay phosphor. Further, there is provided an AC light-emitting device, wherein a plurality of arrays having the different numbers of light emitting cells are employed to increase light emission time and to reduce a flicker effect.
46 Citations
12 Claims
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1. A light emitting device, comprising:
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a light emitting cell array configured to receive an input voltage and comprising a plurality of light emitting cells connected in series on a substrate, the plurality of light emitting cells to emit light comprising a periodically changing luminous intensity in response to the input voltage, the input voltage to periodically change with a period, and a minimum value of the periodically changing luminous intensity is substantially greater than 0. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A light emitting device, comprising:
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a light emitting part to emit light comprising a first period in response to an input voltage, the input voltage periodically changing with a period; and at least one phosphor to absorb the light emitted from the light emitting part and to emit light comprising a different wavelength than the absorbed light. - View Dependent Claims (10, 11, 12)
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Specification