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US 8,013,540 B2Granted
Light adjusting device for a light emitting diode and related light adjusting method and light emitting device
AssigneeNovatek Microelectronics Corp.
InventorsChen-Ming Hung, Yi-Te Liu, Chih-Jen Yen, Chih-Yuan Hsieh
Life of this patent
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Abstract
A light adjusting device for a light emitting diode includes a switch, a detecting unit and an illumination adjusting unit. The switch is coupled to a power terminal, which is utilized for providing power for the light emitting diode. The detecting unit is coupled to the switch, and is utilized for determining a status of the switch, so as to generate a detecting result. The illumination adjusting unit is coupled to the detecting unit, and is utilized for adjusting illumination of the light emitting diode according to the detecting result.
Claims29
A light adjusting device for a light emitting diode comprising:
- a switch coupled to a power end utilized for providing power for the light emitting diode;
- a detecting unit coupled to the switch for determining turned-off times of the switch, so as to generate a detecting result;
- and
- an illumination adjusting unit coupled to the detecting unit for adjusting illumination of the light emitting diode according to the detecting result.
1 more element
A light adjusting method for a light emitting diode comprising:
- determining turned-off times of a switch for transmitting power for driving the light emitting diode, so as to generate a detecting result;
- and
- adjusting illumination of the light emitting diode according to the detecting result.
A light emitting device comprising:
- a power end for receiving an input power;
- a light emitting diode;
- a driving stage coupled to the power end and the light emitting diode for transforming the input power into a driving power and outputting the driving power to the light emitting diode according to a pulse width modulation signal;
- a pulse width modulation controller coupled to the driving stage for generating the pulse width modulation signal according to a light adjusting signal;
- and
- a light adjusting device comprising:
- a switch coupled to the power end;
- a detecting unit coupled to the switch for determining turned-off times of the switch, so as to generate a detecting result;
- and
- an illumination adjusting unit coupled to the detecting unit and the pulse width modulation controller for outputting the light adjusting signal to adjust illumination of the light emitting diode according to the detecting result.
7 more elements
A light adjusting device for a light emitting diode comprising:
- a switch coupled between a power end and a driving stage connected to the light emitting diode, for controlling power generated from the power end to the driving stage;
- a detecting unit coupled to the switch, for determining a status of the switch, so as to generate a detecting result;
- and
- an illumination adjusting unit coupled to the detecting unit, for adjusting illumination of the light emitting diode according to the detecting result.
1 more element
A light emitting device comprising:
- a power end for receiving an input power;
- a light emitting diode;
- a pulse width modulation controller coupled to the driving stage for generating a pulse width modulation signal according to a light adjusting signal;
- a light adjusting device comprising:
- a switch coupled to the power end, for transferring the input power from the power end;
- a detecting unit coupled to the switch for determining a status of the switch, so as to generate a detecting result;
- and
- an illumination adjusting unit coupled between the detecting unit and the pulse width modulation controller for outputting the light adjusting signal to adjust illumination of the light emitting diode according to the detecting result;
- and
- a driving stage coupled to the switch and connected to the light emitting diode for transforming the input power transferred by the switch into a driving power and outputting the driving power to the light emitting diode according to the pulse width modulation signal.
7 more elements
A light adjusting device for a light emitting diode comprising:
- a switch coupled to a power end, for transmitting power from the power end;
- a rectifier coupled to the switch;
- a driving end, coupled between the rectifier and the light emitting diode, for receiving an input voltage from the rectifier and outputting driving power to the light emitting diode;
- a detecting unit coupled to driving end, for generating a detecting result according to the input voltage;
- and
- an illumination adjusting unit coupled to the detecting unit for adjusting illumination of the light emitting diode according to the detecting result.
3 more elements
A light emitting device comprising:
- a power end for receiving an input power;
- a light emitting diode;
- a light adjusting device comprising:
- a switch coupled to the power end, for transferring the input power from the power end;
- a detecting unit coupled to an input voltage, so as to generate a detecting result according to the input voltage;
- and
- an illumination adjusting unit coupled to the detecting unit for outputting a light adjusting signal according to the detecting result;
- a pulse width modulation controller coupled to the illumination adjusting unit for generating a pulse width modulation signal according to the light adjusting signal;
- a rectifier coupled to the switch;
- a driving stage coupled between the rectifier and the light emitting diode and coupled to the pulse width modulation controller, for generating driving power to drive the light emitting diode according to the input voltage and the pulse width modulation signal.
7 more elements
Dependencies are inferred from the claim text.