Voltage control device comprising a first light emitting unit, a first transistor and a control unit

TLDR: In this article, a voltage control device consisting of a first light emitting unit, a first transistor and a control unit was presented, which operated in a saturation region according to a first control signal.

Abstract: The present invention discloses a voltage control device comprising a first light emitting unit, a first transistor and a control unit; the first transistor is electrically connected with the first light emitting unit and operated in a saturation region according to a first control signal; the control unit comprises a selection and comparison module electrically connected with the first light emitting unit, a charging switch module electrically connected with the selection and comparison module, a discharging switch module electrically connected with the selection and comparison module and a capacitor electrically connected with the charging switch module, the discharging switch module and the first transistor; the voltage across the capacitor is used as the first control signal; when a first comparison signal is at a high level, one charging current of the charging switch module flows into the capacitor so that the capacitor is charged by the charging current; and when the first comparison signal is at a low level, the capacitor is discharged by the discharging switch module.