Light emitting device for AC power operation

摘要

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 daring 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.

主权项

1. A light-emitting device, comprising:
a first terminal; a second terminal; a first array of light emitting cells electrically connected in series and disposed between the first terminal and the second terminal; and a second array of light emitting cells electrically connected in series and disposed between the first terminal and the second terminal; wherein a number of the light emitting cells of the first array is different from a number of the light emitting cells of the second array, and wherein the first array and the second array are configured to emit light while maintaining a substantially constant current level flowing through the light emitting cells in response to a varying voltage level received through at least one of the first terminal or the second terminal.