Patent ID: 7728346

Claim:
An LED white light illumination device, capable of being driven directly by an AC power supply without rectification means, the device comprising: a package including a conductor pattern and two leads; an LED chip group including a first LED chip, a second LED chip, a third LED chip and a fourth LED chip, installed on the package, the first to fourth LED chips being connected by a bridge connection circuit having an input and an output, the first to fourth LED chips having the same color of light emitted therefrom; a fifth LED chip installed on the package and connected to the output of the bridge connection circuit, the fifth LED chip having the same color of light as the light of the first to fourth LED chips, ranging from blue light to ultraviolet light, wherein the first to fourth LED chips connected in the bridge connection circuit are divided into two LED chip pairs that are supplied with respective currents of the same phase and installed in a generally cross-shaped opposed arrangement with the fifth LED chip interposed therebetween, and at least one type of a wavelength conversion material is located adjacent all of the first to fifth LED chips, wherein each of the first to fifth LED chips has an active layer, and a total area of the active layer of the fifth LED chip is larger than a total area of the active layer of at least one of the first to fourth LED chips by a multiple of substantially 2 to substantially 2.5.