Driving circuit, light modulator and light modulating method of light-emitting diode

A technology of light-emitting diodes and driving circuits, which is applied to the layout of electric lamp circuits, light sources, electric light sources, etc., can solve the problems of poor display picture quality and inability to accurately control the brightness of light-emitting diodes, and achieve the effect of improving picture quality

Inactive Publication Date: 2014-09-17
CPT TECH GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a driving circuit for light-emitting diodes, aiming to solve the problems in the prior art that the brightness of light-emitting diodes cannot be precisely controlled and the picture quality of the display is poor

Method used

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  • Driving circuit, light modulator and light modulating method of light-emitting diode
  • Driving circuit, light modulator and light modulating method of light-emitting diode
  • Driving circuit, light modulator and light modulating method of light-emitting diode

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Embodiment Construction

[0017] In order to make the object, technical solution and beneficial effects of the present invention more clear, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

[0018] Please refer to figure 2 , figure 2 A schematic diagram illustrating a driving circuit 200 of a light-emitting diode capable of precise dimming according to an embodiment of the present invention. The driving circuit 200 includes a power supply unit 202 , a string of LEDs 204 , a current sink 206 and a dimming unit 208 . The power supply unit 202 has an input terminal for receiving an AC voltage V AC or a DC voltage V DC , an output terminal is used to provide a drive voltage V o and a driving current I LED A string of light emitting diodes 204 includes at least one light ...

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Abstract

The invention provides a driving circuit, a light modulator and a light modulating method of a light-emitting diode. The driving circuit comprises a power supply unit which provides a voltage and a driving current to a string of light-emitting diodes, a light modulating unit which is used for regulating the work cycle of an original light modulating signal according to the driving current and an ideal current so as to generate a light modulating signal, and a current sink coupled to the string of light-emitting diodes, and the work cycle of the driving current is adjusted according to the light modulating signal. According to the invention, the brightness of the light-emitting diodes can be accurately controlled through adjusting the work cycle of the driving current, and the defects of the prior art that the brightness of the light-emitting diodes can not be accurately controlled and the picture quality of a display is poor are overcome.

Description

technical field [0001] The invention relates to a driving circuit of a light-emitting diode capable of precise dimming, a dimmer capable of precise dimming and a method of dimming, especially a kind of precise dimming by adjusting the duty cycle of the driving current of the light-emitting diode. A driving circuit of a light-emitting diode, a dimmer for precise dimming and a method for dimming. Background technique [0002] Generally speaking, the dimming methods of the LED backlight can be divided into two types: burst mode and continuous mode. The dimming method of the continuous mode is to adjust the peak value of the LED current. However, because the dimming mode of the continuous mode will affect the optical characteristics of the display screen, the dimming mode of the general light-emitting diode is mainly based on the burst mode. [0003] The dimming method of the burst mode is mainly to control the on and off of the driving current driving the LED according to the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H05B37/02
Inventor 陈建仰谢博坤蓝东鑫林明璋
Owner CPT TECH GRP
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