Patent ID: 7181351

Claim:
A status indicator for indicating multi-working statuses of an electronic device, comprising a micro-programmable control unit (MCU), a light emitting device, and a driving circuit provided between the MCU and the light emitting device, wherein: the MCU is for producing and outputting pulse-width modulation (PWM) waves to the light emitting device via the driving circuit, the PWM waves having different types of PWM waveforms, each type of PWM waveform having a unique number of PWM unit periods in a peak voltage level of each PWM waveform period and corresponding to one working status of the electronic device, and the MCU comprises: a central processor unit (CPU) for detecting a current working status of the electronic device and controlling generation of the PWM waves having a selective type of PWM waveform that corresponds to the current working status; and an output port for outputting the PWM waves to the light emitting device via the driving circuit; and the driving circuit is for delivering the PWM waves to the light emitting device from the MCU.