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A kind of LED backlight system and display device

A backlight system and LED light string technology, applied in the display field, can solve the problems of LED light string voltage difference, loop instability, and LED backlight system flickering, so as to reduce optical requirements, prevent loop instability, and prevent flickering Effect

Active Publication Date: 2015-09-02
TCL CHINA STAR OPTOELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when the LED light strings are turned on, because the internal resistance of each LED light cannot be exactly the same, it is easy to cause a voltage difference between the LED light strings. When the voltage difference is large, the loop will be unstable. As a result, the LED backlight system may flicker

Method used

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  • A kind of LED backlight system and display device
  • A kind of LED backlight system and display device
  • A kind of LED backlight system and display device

Examples

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Embodiment Construction

[0019] The present invention will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0020] see figure 1 , figure 1 It is a structural schematic diagram of an embodiment of the LED backlight system of the present invention. like figure 1 As shown, the backlight system 10 of the present invention includes a power supply module 11 , an LED display module 12 and an LED backlight control circuit 13 .

[0021] Wherein, the LED display module 12 is electrically connected to the power module 11 and the LED backlight control circuit 13 respectively. The power module 11 is used to provide power. The LED display module 12 includes a plurality of LED light strings 121 connected in parallel. The LED backlight control circuit 13 is used to control the display of the LED light string 121 .

[0022] In this embodiment, the LED backlight control circuit 13 includes a plurality of current modules 14 and a plurality of control modules 15 having t...

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PUM

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Abstract

Disclosed are an LED backlight system and a display apparatus. The LED backlight system comprises an LED display module and an LED backlight control circuit. The LED display module comprises an LED light string. The LED backlight control circuit comprises a current module, a comparing unit, a control switch unit, and an impedance unit. An input end of the comparing unit obtains a voltage of a negative electrode end of the LED light string; when the voltage of the negative electrode end is higher than a preset threshold voltage, the control switch unit is controlled to be turned on to control the impedance unit and the current module to be connected in parallel, so as to reduce the voltage of the negative electrode end. By using the mode, the present invention can prevent the instability of a loop circuit, thereby preventing the phenomenon that the LED backlight system flickers.

Description

technical field [0001] The invention relates to the field of display technology, in particular to an LED backlight system and a display device. Background technique [0002] At present, the existing LED backlight system includes LED light strings and an LED backlight control circuit for controlling the LED light strings, wherein the LED backlight control circuit mainly controls the LED light strings to be turned on and off. However, when the LED light strings are turned on, because the internal resistance of each LED light cannot be exactly the same, it is easy to cause a voltage difference between the LED light strings. When the voltage difference is large, the loop will be unstable. As a result, flickering of the LED backlight system may occur. [0003] Therefore, it is necessary to provide a technical solution to solve the above technical problems. Contents of the invention [0004] The technical problem mainly solved by the present invention is to provide an LED back...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/32H05B44/00
CPCG09G3/32G09G3/342G09G2320/0233G09G2320/0247H05B45/46H05B45/00G09G3/3225
Inventor 曹丹
Owner TCL CHINA STAR OPTOELECTRONICS TECH CO LTD
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