Abstract: The present application relates to a boost circuit for driving a light-emitting diode. The boost circuit comprises: a first input terminal operably connected with an external power supply; a second input terminal operably connected with a pulse width modulation signal source; an output terminal operably connected with the light-emitting diode; a first capacitor, a positive electrode of which is coupled with the first input terminal and the output terminal, and a negative electrode of which is coupled with the second input terminal; and a second capacitor, a positive electrode of which is coupled with the positive electrode of the first capacitor and the output terminal, and a negative electrode of which is grounded, wherein, when an applied pulse width modulation signal is at low level, the external power supply charges the first capacitor with a first voltage.