Patent ID: 8502934

Claim:
A light source unit, comprising: a first substrate having a top surface and a bottom surface opposite to the top surface; a first plurality of light emitting elements mounted on the top surface of the first substrate; a first inner wiring portion, for carrying power to the first plurality of light emitting elements, formed on the top surface of the first substrate and connected to the first plurality of light emitting elements; a second inner wiring portion formed on the top surface of the first substrate, for carrying power to a second plurality of light emitting elements mounted on a top surface of a second substrate without driving any light emitting elements on the first substrate, and insulated from the first inner wiring portion; a first pad installed on the top surface of the first substrate and connected to the first inner wiring portion; a second pad installed on the top surface of the first substrate and connected to the second inner wiring portion; and at least one connection electrode formed on the bottom surface of the first substrate and connected to the second inner wiring portion, wherein the at least one connection electrode is connected to a corresponding at least one connection electrode formed on a bottom surface of the second substrate that is connected to the second plurality of light emitting elements of the second substrate.