| 摘要 |
In a driving circuit for controlling a brightness of a light emitting diode based on a duty ratio of a pulse-width modulation signal, an integration circuit is disposed on a connecting line between a gate of a first transistor coupled with a constant current source and a gate of a second transistor coupled in series with a light emitting diode. The integration circuit smoothes a change in a gate voltage of the first transistor and transmit a smoothed change in the gate voltage to the gate of the second transistor. A third transistor is coupled between a ground and a portion of the connecting line located between the gate of the first transistor and the integration circuit. The third transistor is activated and deactivated based on the duty ratio, thereby changing the gate voltages of the first transistor and the second transistor.
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