Patent ID: 8188687
Filing Date: 2012-05-29
Classification: H01L,H05B

Abstract:
1. A light emitting device, comprising: a light emitting diode (LED) chip comprising a substrate, an array of light emitting cells connected in series on the substrate, another array of light emitting cells connected in series on the substrate, the other array being connected in reverse parallel to the array of the light emitting cells, a source terminal, and a ground terminal; and switching blocks that are each electrically connected to the source terminal, the ground terminal, and a respective one of a plurality of nodes between each of the light emitting cells, to sequentially turn on and off the light emitting cells, when an AC voltage is applied to the array, wherein an n-th switching block (n being a positive integer) shorts the ground terminal and a node to which the n-th switching block is connected, when a voltage difference (Vac) between the source and ground terminals is in a range of (Predetermined Voltage×n) to (Predetermined Voltage×(n+1)), and opens the node from the ground terminal if the voltage difference (Vac) is greater than (Predetermined Voltage×(n+1)), and wherein nodes between the light emitting cells of the other array of light emitting cells are respectively connected to the switching blocks.