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Driving circuit and method of light emitting diode

A technology for light-emitting diodes and driving circuits, which is applied to electroluminescent light sources, electric lamp circuit arrangements, light sources, etc., can solve the problems of rising cost of light-emitting diode driving circuits 10 and the like, and achieve the effect of low cost

Active Publication Date: 2012-10-31
AU OPTRONICS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In the known technology, although the voltage division effect of the transistor 16 connected in series with the LED string 12 can be used to prevent the control pin 121 of the LED driving integrated circuit 12 from being damaged due to insufficient withstand voltage, the configuration of the transistor 16 It is bound to cause the cost of the LED driving circuit 10 to rise

Method used

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  • Driving circuit and method of light emitting diode
  • Driving circuit and method of light emitting diode
  • Driving circuit and method of light emitting diode

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Embodiment Construction

[0040] In order to make the above and other objects, features and advantages of the present invention more comprehensible, preferred embodiments will be described in detail below together with the accompanying drawings.

[0041] see figure 2 , which shows a LED driving circuit related to an embodiment of the present invention. Such as figure 2 As shown, the LED driving circuit 30 includes a LED driving integrated circuit 32 , a boost circuit 33 , a plurality of LED strings 34 and a plurality of resistors R. As shown in FIG.

[0042] The LED driving integrated circuit 32 has a plurality of control pins 321, and in this embodiment, the LED driving integrated circuit 32 includes a pulse width modulation circuit 320 to drive each LED string 34 in a pulse width modulation manner; wherein, the pulse Width modulation circuit 320 provides pulse width modulation signal V PWM To a plurality of transistors connected to the control pin 321 to switch the on / off state of each transisto...

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Abstract

The invention provides driving circuit and method of a light emitting diode. The driving circuit of the light emitting diode comprises a driving integrated circuit of the light emitting diode, a light emitting diode string and a resistor. The light emitting diode string is electrically connected with power supply voltage and a control end of the driving integrated circuit of the light emitting diode for accepting the control of the driving integrated circuit of the light emitting diode on driving current of the light emitting diode string; and the resistor is electrically connected to the control end and preset potential.

Description

technical field [0001] The present invention relates to the technical field of driving light emitting diodes, and in particular relates to a driving circuit and a driving method of light emitting diodes. Background technique [0002] see figure 1 , which shows a LED driving circuit related to the known technology. Such as figure 1 As shown, the LED driving circuit 10 includes a LED driving integrated circuit 12 , a plurality of LED strings 14 and a plurality of transistors 16 . [0003] The LED driving integrated circuit 12 has a plurality of control pins 121 as control terminals of the driving current of the LED string 14 , which control the driving current of the LED string 14 in a pulse width modulation (PWM) manner. One end of each light emitting diode string 14 is electrically connected to the power supply voltage VDD, and the other end is electrically connected to the corresponding control pin 121 of the light emitting diode driving integrated circuit 12 through the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/08H05B37/02H05B33/08H05B44/00
Inventor 柯见铭李岳翰许胜凯李弘庆
Owner AU OPTRONICS CORP