A support mechanism comprises a support board, a bracket and a stopping mechanism. The support board comprises an end portion and a center portion, the support board end is configured to pivotably connect to a housing. The bracket comprises a first end and a second end, the first end is configured to pivotably connected to the support board center portion. The stopping mechanism is adapted for coupling the second end to the housing such that the bracket is selectively and stably stopping at a closed position and an open position or positions between the closed position and the open position.