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Backlight module and display device

A technology of backlight module and dimming controller, which is applied in the direction of lighting devices, fixed lighting devices, components of lighting devices, etc. It can solve electromagnetic interference, discontinuous output current of backlight driver, reduce efficiency of LED backlight driver, etc. problem, achieve the effect of improving efficiency and reducing electromagnetic interference

Active Publication Date: 2012-10-03
BOE TECH GRP CO LTD +1
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  • Summary
  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0004] However, when the current PWM dimming is used, the LED dimming control switch works in a discontinuous state. When the control switch is in the off state at the same time, the driving current provided by the backlight driver to the LED will be turned off, so that the output current of the backlight driver is discontinuous. This will cause serious EMI (electro magnetic interference, electromagnetic interference) problems, and will reduce the efficiency of the LED backlight driver

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  • Backlight module and display device
  • Backlight module and display device

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Embodiment Construction

[0024] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0025] Such as figure 1 As shown, a backlight module provided by an embodiment of the present invention includes:

[0026] Multiple LED light strips, each LED light strip includes a positive pole and a negative pole, and the oblique arrow in the figure indicates that the LED emits light;

[0027] A plurality of transistor switches, the transistor switches are in one-to-one correspondence with the LED light bar, and each transistor switch include...

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Abstract

The embodiment of the invention provides a backlight module and a display device, which can reduce electromagnetic interference of a backlight circuit and increase efficiency of a backlight source driver. The circuit comprises a plurality of LED (light-emitting diode) lamp bars, a plurality of crystal switches, the backlight source driver and a dimming controller. The embodiment of the invention is used for manufacturing displays.

Description

technical field [0001] The invention relates to the field of display manufacturing, in particular to a backlight module and a display device. Background technique [0002] Existing liquid crystal displays can use light emitting diodes (Light Emitting Diode, LED for short) as their backlight sources, mainly including side-lit type and direct-lit type. The existing LED backlight is a point light source. In the edge-lit backlight, a plurality of LEDs are adjacently arranged on a straight line; in the direct-lit backlight, a plurality of LEDs are evenly arranged on a plane. [0003] At present, PWM dimming (pulso width modulation dimming, pulse width modulation dimming) is mostly used in LED backlight driving. PWM dimming is a dimming technology that uses simple pulse signals to repeatedly switch white LED dimming control switches. The dimming controller system only needs to provide wide and narrow digital pulses to adjust the brightness of white LEDs. The advantage of PWM dim...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21S8/00F21V23/04F21V23/06H05B37/02G02F1/13357F21Y101/02
CPCG09G3/36Y02B20/42G09G3/3406G09G2320/0626
Inventor 李卫海张亮张斌孙志华侯帅许益祯汪建明
Owner BOE TECH GRP CO LTD