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Drive system and drive method of light-emitting diode

A light-emitting diode and drive system technology, applied in the field of light-emitting diode drive systems, can solve problems such as the unstable load current of the booster power stage circuit 16, the unstable voltage of the light-emitting diode string 10 through the current input pad 11, etc.

Active Publication Date: 2014-07-16
MEDIATEK INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

It can be seen from the figure that even if the voltage source V DC There is no overflow (overshoot) phenomenon, however, the voltage source V DC When the dimming signal PWM is in a low potential (or off) state, there will be an unstable transient phenomenon due to the capacitance and resistance in the system, which will still cause an unstable load on the boost power stage circuit 16 electric current
At the same time, the passing current of the LED string 10 and the voltage of the input pad 11 cannot be stabilized.

Method used

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  • Drive system and drive method of light-emitting diode
  • Drive system and drive method of light-emitting diode
  • Drive system and drive method of light-emitting diode

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Embodiment Construction

[0053] figure 2 The schematic diagram of the figure shows that the LED driving system of the embodiment of the present invention is used to drive a plurality of LED strings (LED strings) 10, which can be applied to the backlight module of the liquid crystal display, but not limited thereto. In this embodiment, the LED driving system mainly includes a plurality of current sources I0 , I1 . . . In and a multi-phase control signal generator 20 . Multiple current sources I0 , I1 . . . In are respectively connected to multiple LED strings 10 . Each light emitting diode string 10 includes a plurality of light emitting diodes 100 connected in series, and the anode of the outermost light emitting diode 100 of the light emitting diode string 10 is connected to the voltage source V DC , and the cathodes of the outermost LEDs 100 of the LED string 10 are connected to input pads p0, p1 . . . pn of the integrated circuit 2 .

[0054] The LED driving system of this embodiment further inc...

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Abstract

The invention relates to a drive system of a light-emitting diode, which is used for driving multiple light-emitting diode strings. Multiple current sources are respectively connected with the multiple light-emitting diode strings. A multi-phase control signal generator is used for generating multiple multi-phase control signals to respectively open or close the multiple power supply sources, so that the multiple corresponding light-emitting diode strings can be switched on or off.

Description

technical field [0001] The present invention relates to a LED driving system, in particular to a LED driving system using multi-phase control signals to control LEDs. Background technique [0002] In view of many advantages of light-emitting diodes (LEDs), such as small size, short response time, low power consumption, high reliability, and high feasibility of mass production, light-emitting diodes are widely used as light sources in electronic devices. For example, light-emitting diodes are used as the backlight of liquid crystal displays (LCDs) to replace traditional fluorescent tubes. [0003] Figure 1A The schematic diagram of FIG. 2 shows a conventional LED driving system, which mainly includes a plurality of LED strings 10 , a minimum voltage selector 12 , a boost controller 14 and a boost power stage circuit 16 . [0004] for Figure 1A As shown in the conventional LED driving system, even if each LED string 10 uses the same voltage source V-- DC and the same numbe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02
Inventor 林宋宜潘宣亦王弘毅
Owner MEDIATEK INC