The invention provides an improved device, method and system for providing a modular light emitting diode (LED) circuit assembly. Especially, an embodiment of the device, the method and the system comprises a modular LED circuit which can have various wide form expansion and application. An embodiment can provide a device for supporting the LED which comprises an LED circuit board, a first main surface and a second main surface, wherein the first main surface can comprise a first contact pad and a second contact pad, and each of the first contact pad and the second contact pad is set as a single connector for receiving from the LED. The second main surface of the LED circuit board can comprise a first region, a second region and a third region, wherein a substrate is connected onto the LED circuit board through the third region.