| 摘要 |
A light-emitting diode driving circuit according to an embodiment of this invention includes a light-emitting diode (1), a first current switch circuit (2) connected in series with the light-emitting diode (1), the first current switch circuit (2) turning on/off a current in accordance with an external input signal input from an input terminal (32), a pulse current generating circuit (3) connected in parallel with the first current switch circuit (2), the pulse current generating circuit (3) supplying a pulse current including a pulse width smaller than the pulse width of the external input signal and shaping a leading edge portion of an optical waveform output from the light-emitting diode (1) into a desired optical waveform, and a discharge circuit (5) connected in parallel with the light-emitting diode (1), the discharge circuit (5) quickly discharging charge stored in the light-emitting diode (1) when the current to the first current switch circuit (2) is turned off. <IMAGE> |
