| 摘要 |
<P>PROBLEM TO BE SOLVED: To make a motion break or flicker inconspicuous by eliminating or shortening a non-lighting period even after applying a voltage to an LED row by a low voltage phase of a full-wave rectification waveform. <P>SOLUTION: A voltage detection circuit 110 measures a voltage of a full-wave rectification waveform and brings a switch 130 into conduction only while the voltage of the full-wave rectification waveform is low. The switch 130 is connected in series to a light-emitting circuit 120, which flows an electric current into the light-emitting circuit 120 only while the switch 130 is being brought into conduction. In the light-emitting circuit 120, an LED row 123 and a current limit circuit 124 are connected in series and a capacitor 125 is connected in parallel to the series circuit. Even while the switch 130 is being brought into non-conduction after the voltage of the full-wave rectification waveform becomes higher, the capacitor 125 is discharged to illuminate the LED row 123. <P>COPYRIGHT: (C)2013,JPO&INPIT |
