A light-emitting diode backlight system and current distributor

A technology of light emitting diode and backlight system, applied in the direction of light source, electric light source, electric lamp circuit layout, etc., can solve the problems of affecting display effect, different current, uneven brightness of flat panel display backlight, etc.

Active Publication Date: 2016-03-09
IML HONG KONG LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, since each light-emitting diode has a slight error in electrical characteristics, when multiple light-emitting diodes are connected in series, the current flowing through each group of light-emitting diodes connected in series may be different, resulting in a flat panel display. The uneven brightness of the backlight affects the display effect
[0004] In addition, in the past, in order to reduce the thickness of the flat panel display, the power supply and current source in the LED backlight system are arranged on the motherboard. Many connection lines are needed to control multiple groups of LEDs connected in series, so the connection method is more complicated and easily disturbed by noise

Method used

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  • A light-emitting diode backlight system and current distributor
  • A light-emitting diode backlight system and current distributor
  • A light-emitting diode backlight system and current distributor

Examples

Experimental program
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Embodiment Construction

[0040] Please refer to figure 1 . figure 1 is a schematic diagram illustrating an LED backlight system 100 according to an embodiment of the present invention. The LED backlight system 100 includes a motherboard 102 , a power supply 104 , a current source 106 , a backlight module 108 , a first power line 110 and a second power line 112 . The power supply 104 and the current source 106 are installed on the motherboard 102 and the current source 106 is coupled to the power supply 104 ; the backlight module 108 includes a plurality of LEDs 114 and a current distributor 118 . Each group of LEDs 114 in the plurality of groups of LEDs 114 includes a plurality of LEDs 116 connected in series; the current distributor 118 is coupled to the plurality of groups of LEDs 114 for distributing the current flowing through the plurality of groups of LEDs 114 . The first power line 110 is coupled to the power supply 104 and multiple sets of light-emitting diodes 114, and transmits a high pote...

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Abstract

The invention discloses a light-emitting diode backlight system and a current distribution device. The current distribution device comprises multiple current adjustment units and one reference voltage adjustment unit. The multiple current adjustment units are used for distributing current flowing through multiple groups of light-emitting diodes. The reference voltage adjustment unit is coupled with the multiple groups of the current adjustment units and used for controlling the multiple groups of the current adjustment units according to one reference voltage. One embodiment of the invention provides the current distribution device capable of evenly distributing current flowing through the multiple groups of the light-emitting diodes. Besides, influence of a channel effect of a transistor on current distribution is reduced. According to the current distribution device provided by another embodiment of the invention, when any one group of the light-emitting diode in the multiple groups of the light-emitting diodes is disconnected, the current distribution device can self-adjust to distribute current to other groups of the light-emitting diodes which are not disconnected so that lost of current distribution effect in abnormal situations is avoided.

Description

technical field [0001] The invention provides a current distributor, especially a current distributor suitable for LED backlight systems. Background technique [0002] With the technical development of the LED backlight system, more and more flat panel displays have used the LED backlight system as the source of the backlight. Flat panel displays with different sizes and different application requirements need to use multiple groups of series-connected light emitting diodes of different types as backlight sources to meet different requirements. [0003] However, since each light-emitting diode has a slight error in electrical characteristics, when multiple light-emitting diodes are connected in series, the current flowing through each group of light-emitting diodes connected in series may be different, resulting in a flat panel display. The uneven brightness of the backlight affects the display effect. [0004] In addition, in the past, in order to reduce the thickness of ...

Claims

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Application Information

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Patent Type & AuthorityPatents(China)
IPC IPC(8): H05B37/00
Inventor江永欣李怡玫
OwnerIML HONG KONG LTD