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Backlight driving circuit and driving method thereof, backlight module and display device

A backlight drive circuit, backlight drive technology, applied in static indicators, instruments, etc., can solve the problems of backlight current jitter, screen flicker, etc.

Active Publication Date: 2019-12-06
BOE TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the inventor found that when the output voltage on each current transmission channel is pulled to the protection voltage, the Boost (boost) circuit stops working, the backlight strip current is pumping, the output voltage decreases, and the feedback voltage decreases accordingly. If it is too low, the current of the backlight bar will fluctuate, causing the flickering problem

Method used

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  • Backlight driving circuit and driving method thereof, backlight module and display device
  • Backlight driving circuit and driving method thereof, backlight module and display device
  • Backlight driving circuit and driving method thereof, backlight module and display device

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Such as figure 1 As shown, this embodiment provides a backlight driving circuit, including: a backlight driving chip and a current driving unit; the backlight driving chip has a plurality of current output channels;

[0027] Among them, the multiple current output channels include a first current output channel connected to the backlight strip, and a second current output channel connected to the current control unit; the current control unit is used for the voltage signal output by the first current output channel When adjusting the brightness of the backlight light bar, the compensation voltage is provided for the second current output channel; the compensation voltage is greater than the voltage provided by the first current output channel for the backlight light bar.

[0028] In this embodiment, the current output channel that is not connected to the backlight light bar, that is, the second current output channel, is connected to the current control unit. Therefore, when ...

Embodiment 2

[0037] This embodiment provides a backlight module, which may include the aforementioned backlight driving circuit. Of course, the backlight module may also include a backlight light bar connected to the first current output channel of the backlight driving circuit.

[0038] In this embodiment, the current output channel that is not connected to the backlight light bar, that is, the second current output channel, is connected to the current control unit. Therefore, when the brightness of the backlight light bar is adjusted, the current control unit is the second The current output channel provides the compensation voltage, and the compensation voltage is greater than the voltage value provided for the backlight strip, so that when the brightness of the backlight strip is adjusted, the voltage of the backlight strip will not be adjusted to the second current output The protection voltage when the channel is empty, then it will not cause the current of the backlight bar to jitter a...

Embodiment 3

[0040] This embodiment provides a display device, which includes the backlight module in Embodiment 2. Therefore, the display effect of the display device is better.

[0041] Of course, the display device in this embodiment may include any products or components with display functions such as liquid crystal panels, mobile phones, tablet computers, televisions, monitors, notebook computers, digital photo frames, navigators, and so on.

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PUM

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Abstract

The present invention provides a backlight drive circuit and a drive method thereof, a backlight module and a display device, belonging to the technical field of display. The backlight drive circuit comprises backlight drive chips and a current control unit; the backlight drive chips have a plurality of current output channels, wherein the current output channels comprise first current output channels connected with backlight light bars, and second current output channels connected with the current control unit; the current control unit is configured to supply compensation voltages to the second current output channels when luminance of the backlight light bars is regulated through voltage signals output by the first current output channels; and the compensation voltages are larger than the voltages provided by the first current output channels for the backlight light bars.

Description

Technical field [0001] The invention belongs to the field of display technology, and specifically relates to a backlight driving circuit and a driving method thereof, a backlight module and a display device. Background technique [0002] When the backlight driver chip (LED Driver) starts to work, it will detect each current output channel of the backlight driver chip, and obtain the lowest voltage (pulse wave) in the current output channel as feedback to adjust each current of the backlight driver chip Output the output voltage of the channel, thereby adjusting the corresponding brightness. When it is detected that there is no voltage on one of the current output channels, the output voltage on each current transmission channel will be pulled to the protection voltage (OVP) at this time. After that, it detects whether the voltage on each current transmission channel has changed. If the voltage does not change, the backlight driver chip will recognize that the previous non-voltag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G09G3/34
CPCG09G3/3413
Inventor 吴欣欣冉博侯帅徐波王小俊
Owner BOE TECH GRP CO LTD