LED driving method and LED driving circuit

A technology of light-emitting diodes and driving methods, which is applied to the layout of electric lamp circuits, light sources, electric light sources, etc., can solve the problems of low efficiency of light-emitting diodes and cannot be automatically adjusted, and achieve the effect of improving driving efficiency
CN101902861AActive Publication Date: 2010-12-01AU OPTRONICS CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
AU OPTRONICS CORP
Publication Date
2010-12-01

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Abstract

The invention relates to a LED driving method and an LED driving circuit. The LED driving method comprises the following steps of: providing a first PWM (Pulse Width Modulation) signal to decide the brightness of an LED; acquiring the duty cycle of the first PWM signal; and enabling the LED to selectively work in a PWM dimming mode or a DC dimming mode according to the relative value relation of the acquired duty cycle and a preset critical value. The dimming model of the LED is set according to the value of the duty cycle to control the brightness of the LED at two stages, i.e. the whole LEDdriving efficiency can be effectively improved by adopting a mixed dimming mode.
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Description

technical field

[0001] The invention relates to the technical field of light emitting diode driving, and in particular relates to a light emitting diode driving method and a light emitting diode driving circuit. Background technique

[0002] Since the display panel of the non-self-illuminating display (for example: liquid crystal display) does not emit light itself, a backlight source is needed to provide backlighting for the display panel. At present, backlight sources can be roughly classified into cold cathode fluorescent lamps, hot cathode fluorescent lamps, light emitting diodes (LEDs) or other electroluminescent elements. Among them, light-emitting diodes are more and more widely used as backlight sources for liquid crystal displays due to their advantages such as high color saturation, no mercury, long life, low energy consumption, and adjustable color temperature through driving current.

[0003] At present, in order to reduce the power consumption of the light-emit...

Claims

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