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

A backlight drive circuit and backlight drive technology, applied to static indicators, instruments, etc., can solve the problems of backlight bar current jitter, flickering, etc.

Active Publication Date: 2018-07-24
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 drive circuit and drive method thereof, backlight module and display device
  • Backlight drive circuit and drive method thereof, backlight module and display device
  • Backlight drive circuit and drive method thereof, backlight module and display device

Examples

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Embodiment 1

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

[0027] Wherein, the plurality of current output channels include a first current output channel connected with the backlight strip, and a second current output channel connected with the current control unit; the current control unit is used for the voltage signal output by the first current output channel , when adjusting the luminous brightness of the backlight light bar, a 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] Since 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 in this embodiment, wh...

Embodiment 2

[0037] This embodiment provides a backlight module, which may include the above-mentioned backlight driving circuit. Of course, the backlight module may also include a backlight strip connected to the first current output channel of the backlight driving circuit.

[0038] Since 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 in this embodiment, when adjusting the brightness of the backlight light bar, the current control unit is used for the second current output channel. The current output channel provides a compensation voltage, and the compensation voltage is greater than the voltage value provided for the backlight strip, so that when adjusting the brightness of the backlight strip, the voltage of the backlight strip will not be adjusted to the second current output. The protection voltage when the channel is no-load, then it will not cause the current of the b...

Embodiment 3

[0040] This embodiment provides a display device, which includes the backlight module in the second embodiment. Therefore, the display device has a better display effect.

[0041] Of course, in this embodiment, the display device may include any product or component with a display function, such as a liquid crystal panel, a mobile phone, a tablet computer, a television, a monitor, a notebook computer, a digital photo frame, and a navigator.

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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 in particular 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. The output voltage of the output 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). After that, it will detect whether the voltage on each current transmission channel changes. If there is no change in the voltage, the backlight driver chip will consider that the previous no-voltage ...

Claims

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Application Information

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Patent Type & Authority Applications(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