Patent ID: 7591649

Claim:
A circuit board element comprising: a circuit board including a board having a first end, a second end opposite to the first end, a third end, a fourth end opposite to the third end, a first protrusion provided on the first end, a second protrusion provided on the third end, a first receptacle defined in the second end, a second receptacle defined in the fourth end; and a first electric trace extending from the first end to the second end, the first electric trace having a first exposed end at the first protrusion and an opposite second exposed end in the first receptacle, the first protrusion being fittingly engaged in the first receptacle of another similar circuit board, a second electric trace extends from the third end to the fourth end, the second electric trace having a first exposed end at the second protrusion and an opposite second exposed end in the second receptacle, the second protrusion being fittingly engaged in the second receptacle of another similar circuit board; and a first light emitting diode and a second light emitting diode mounted on the board, the first light emitting diode being electrically connected with the first electric trace and the second light emitting diode being electrically connected with the second electric trace.