A flexible circuit board. The flexible circuit board is connected to an LCD module, comprising a first conductive portion, a second conductive portion, a third conductive portion, a conductive trace and a slot. The second conductive portion is disposed at the border of flexible circuit board and comprises a first contact pad. The third conductive portion is located between the first and second conductive portions. The conductive trace comprises a first trace segment a second trace segment. The first conductive segment connects the first conductive portion with the first contact pad, and the second trace segment connects the second conductive portion with the third conductive portion, wherein the slot is formed between the first and second trace segments.