| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a light-emitting diode driving circuit for controlling the duty of a gate control signal in a digital system and a light-emitting diode system including the same. <P>SOLUTION: A light-emitting diode driving circuit includes a current driving circuit, a level detector, a comparator circuit, a digital control circuit, and a power supply circuit. The level detector generates a minimum detection voltage signal with a minimum voltage level among voltage signals of first terminals of a light-emitting diode string. The comparator circuit generates a first comparison output signal and a second comparison output signal based on a headroom control reference voltage and the minimum detection voltage. The digital control circuit controls the duty of a gate control signal in a digital system based on the first comparison output signal, the second comparison output signal, and a control clock. Thus, the light-emitting diode driving circuit occupies a small area in a semiconductor integrated circuit. <P>COPYRIGHT: (C)2012,JPO&INPIT |
