LED driving apparatus and driving method thereof

Abstract

The invention discloses an LED (light emitting diode) driving device and a driving method thereof. The LED driving device comprises a duty-cycle setting unit, a direct-current setting unit, a control unit and an LED driving circuit, wherein the duty-cycle setting unit is used for outputting a duty-cycle setting signal; the direct-current setting unit is used for outputting a direct-current setting signal; the control unit is used for receiving the duty-cycle setting signal and the direct-current setting signal and outputting a direct-current control signal and a duty-cycle control signal according to the duty-cycle setting signal and the direct-current setting signal; and the LED driving circuit is used for driving at least one LED according to the direct-current control signal and the duty-cycle control signal. The LED driving device and the driving method thereof can effectively adjust the current value and duty cycle of the LED driving current, thereby not only improving the work efficiency of the LED, but also accurately controlling the average on-state current of the LED.

Description

technical field [0001] The present invention relates to a light emitting diode driving device and a driving method thereof, more precisely, to a light emitting diode driving device and a driving method thereof applied to a panel. Background technique [0002] Due to good characteristics such as low power consumption and low operating temperature, light emitting diodes (Light Emitting Diodes, LEDs) have been widely used at present. [0003] For example, most small and medium-sized panels use 3 to 10 LEDs, which are connected in series as the backlight source, and even the backlight of the keyboard of a mobile phone or a Personal Digital Assistant (PDA) is mostly a backlight. The use of LEDs as auxiliary lighting, coupled with the European Union's requirements for mercury-free, so the newer generation of LED drive technology is quite expected by the market. [0004] Most of the portable products are designed with a dimming function for the backlight of the panel, that is to s...

AI Technical Summary

Problems solved by technology

[0005] 1. The LED drive current is a fixed value, which cannot be automatically adjusted according to the usage conditions

Since the light-emitting diodes control the intensity of light emission by the magnitude of the current flowing through the light-emitting diodes, the driving method with a fixed current value limits the convenience of its use.

[0006] 2. The driving current is fixed at the current at the maximum brightness, and the current at the maximum brightness is used at non-maximum brightness, which will cause the LED to act in a lower efficiency area

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