A control switch of a driving circuit, the control switch comprising a thin film transistor, the driving circuit further comprising at least one source lead connected to the thin film transistor, the thin film transistor comprising: a source electrode, comprising at least four source branches arranged in parallel, and a source trunk connecting the at least four source branches together, wherein each source branch directly connected to the at least one source lead is a first source branch, and wherein the first source branch is connected to an end of the source trunk; a drain electrode, disposed in a same layer as the source electrode, comprising at least three drain branches and a drain trunk connecting the at least three drain branches together, wherein the at least three drain branches and the at least four source branches are arranged in parallel and alternately to form channels, and wherein each drain branch disposed adjacent to each first source branch is a first drain branch; and a gate electrode, disposed corresponding to the source electrode and the drain electrode; wherein an extension line of each of the source leads is located between the respective first drain branch and the source trunk; the thin film transistor is connected to two said source leads, wherein a number of the first source branches is two, and wherein the two first source branches are respectively connected to both ends of the source trunk and are connected to the two source leads in one-to-one correspondence; each first drain branch is disposed between the two first source branches, and wherein an extension line of each of the two source leads is located between the respective first drain branch and the source trunk and does not overlap the respective first drain branch; each source branch not directly connected to the at least one source lead is a second source branch, wherein the number of the second source branches is at least two, and wherein the second source branch is arranged in parallel between the two first source branches, and is connected to the source trunk; each drain branch not disposed adjacent to the first source branch is a second drain branch, wherein a number of the first drain branches is two and a number of the second drain branches is at least one, and the two first drain branches are respectively connected to two ends of the drain trunk, wherein the second drain branch is arranged in parallel between the two first drain branches, and is connected to the drain trunk; each first drain branch is arranged between the respective first source branch and the respective second source branch that are adjacent to each other, and the second drain branch is arranged between two adjacent second source branches; and a distance between the at least one second drain branch and the source trunk is less than a distance between each first drain branch and the source trunk. a source electrode, comprising at least four source branches arranged in parallel, and a source trunk connecting the at least four source branches together, wherein each source branch directly connected to the at least one source lead is a first source branch, and wherein the first source branch is connected to an end of the source trunk; a drain electrode, disposed in a same layer as the source electrode, comprising at least three drain branches and a drain trunk connecting the at least three drain branches together, wherein the at least three drain branches and the at least four source branches are arranged in parallel and alternately to form channels, and wherein each drain branch disposed adjacent to each first source branch is a first drain branch; and a gate electrode, disposed corresponding to the source electrode and the drain electrode; wherein an extension line of each of the source leads is located between the respective first drain branch and the source trunk; the thin film transistor is connected to two said source leads, wherein a number of the first source branches is two, and wherein the two first source branches are respectively connected to both ends of the source trunk and are connected to the two source leads in one-to-one correspondence; each first drain branch is disposed between the two first source branches, and wherein an extension line of each of the two source leads is located between the respective first drain branch and the source trunk and does not overlap the respective first drain branch; each source branch not directly connected to the at least one source lead is a second source branch, wherein the number of the second source branches is at least two, and wherein the second source branch is arranged in parallel between the two first source branches, and is connected to the source trunk; each drain branch not disposed adjacent to the first source branch is a second drain branch, wherein a number of the first drain branches is two and a number of the second drain branches is at least one, and the two first drain branches are respectively connected to two ends of the drain trunk, wherein the second drain branch is arranged in parallel between the two first drain branches, and is connected to the drain trunk; each first drain branch is arranged between the respective first source branch and the respective second source branch that are adjacent to each other, and the second drain branch is arranged between two adjacent second source branches; and a distance between the at least one second drain branch and the source trunk is less than a distance between each first drain branch and the source trunk.