A structure of a plurality of thin film transistors wherein a peripheral circuit on a glass substrate of a liquid crystal display panel; and each of polycrystalline silicon thin film 13 of the thin film transistor is formed on the glass substrate; and each of gate electrode 15 is formed on a gate insulation layer, and each of the gate electrode 15 is overhead corresponding to the polycrystalline silicon thin film 13 for a channel; wherein the gate electrode 15 is comprised a pair of projection part 15A and a gate-channel 15B; and wherein the pair of projection part 15A is formed the both sides of the gate-channel 15B in which the side is for along the channel-direction, and wherein the pair of projection part 15A is enlarged for across the channel-direction.