Patent ID: 8562360

Claim:
A circuit board assembly comprising: a circuit board for supporting electronic components, the circuit board comprising: a plurality of first contacts located at one side of the circuit board; and a plurality of second contacts located at the other side of the circuit board, each second contact electrically connected to a corresponding one of the first contacts; a fixing device for holding and securing the circuit board, the fixing device comprising a plurality of elastic contacts; and at least one color-changing piece, wherein the color-changing pieces are located on and are electrically connected to the first contacts or the second contacts, when the circuit board is assembled at a predetermined position relative to the fixing device, the contacts connected to the color changing pieces are correspondingly electrically connected to the elastic contacts to form an electric field that changes the color of the color-changing pieces; wherein the circuit board is a flexible printed circuit board, the circuit board further comprises a first surface and a second surface parallel to the first surface, the first contacts are arranged and located on the first surface, the second contacts are arranged and located on the second surface at positions corresponding to the positions of the first contacts, and the first contacts and the second contacts are electrically connected to conductive pathways of the circuit board.