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Back light module, driving method thereof and liquid crystal display

A technology of a backlight module and a driving method, which is applied to static indicators, optics, instruments, etc., can solve the problems of high driving power consumption, high cost, low light utilization rate, etc., so as to reduce driving power consumption, reduce quantity, and save cost effect

Inactive Publication Date: 2010-10-06
BOE TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the above-mentioned technology has certain defects, that is, the lamp tube is arranged behind the liquid crystal panel, resulting in an increase in the overall thickness of the liquid crystal display, which is contrary to the thinning development trend of the liquid crystal display. It can only be used in the field of TVs and monitors, but cannot be used in thin display devices such as notebooks
In addition, the liquid crystal display requires multiple light tubes to switch alternately to achieve the effect of scanning. The number of light sources is large, and the utilization rate of light is low, resulting in high power consumption and high cost of driving.

Method used

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  • Back light module, driving method thereof and liquid crystal display
  • Back light module, driving method thereof and liquid crystal display
  • Back light module, driving method thereof and liquid crystal display

Examples

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no. 1 example

[0031] figure 2 It is a structural representation of the first embodiment of the backlight module of the present invention Figure 1 . Such as figure 2 As shown, the backlight module includes: a light guide cavity 4 , a backlight source 1 , a grating cover 2 and a reflector 5 . Wherein, the light guide cavity 4 includes a back plate 42, and the surface on the side opposite to the back plate 42 in the light guide cavity 4 is the light output surface 41 of the light guide cavity 4. When the backlight module is assembled into the liquid crystal display, the light output surface 41 is Adjacent to the liquid crystal panel 20 and parallel to d, the light emitting surface 41 is an imaginary surface corresponding to the light incident surface of the liquid crystal panel 20; the backlight source 1 is arranged on the side of the light guide cavity 4; the grating cover 2 is arranged on the backlight source 1 On the outside, the grating cover 2 is provided with at least one grating s...

no. 2 example

[0037] Figure 4 It is a structural schematic diagram of the second embodiment of the backlight module of the present invention. The difference between this embodiment and the first embodiment is that there are multiple reflecting mirrors 5 arranged at intervals on the back plate 42 , and the reflecting mirrors 5 in this embodiment are plane mirrors. Preferably, there is an acute angle between the plane where each reflector 5 is located and the back plate 42 .

[0038] The working principle of the backlight module of this embodiment is: the backlight source 1 emits constant light, and the scanning beam emitted from the grid slit 3 is irradiated on the backplane 42; At a certain angle, the scanning beam can be reflected out of the light guide cavity 4, such as Figure 4 As shown; the grating cover 2 rotates around the backlight source 1 at a set speed. With the rotation of the grating cover 2, the position of the grid slit 3 changes, and the scanning beam can move on the back...

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Abstract

The invention relates to a back light module, a driving method thereof and a liquid crystal display. The back light module comprises a light guide chamber, a back light source, a grating cover and a reflection mirror, wherein the light guide chamber comprises a back plate; the back light source is arranged at the side of the light guide chamber; the grating cover covers outside the back light source, at least one grating seam for transmitting light beams emitted by the back light source to form scanning light beams is arranged on the grating cover, and the grating cover rotates around the back light source so that the scanning light beams movably irradiates on the back plate of the light guide chamber; and the reflection mirror is arranged on the back plate of the light guide chamber and used for reflecting the movably-irradiated scanning light beams out of the light guide chamber. The method comprises the steps of: driving the back light source to lighten, and forming the scanning light beams through the transmission of the light beams out of the grating seam on the grating cover; driving the grating cover to rotate according to the set frequency, movably irradiating on the back plate by the scanning light beams, and reflecting the scanning light beams out of the light guide chamber by the reflection mirror. The technical scheme can reduce the thickness of the liquid crystal display, reduce the energy consumption for driving, and save the cost.

Description

technical field [0001] The present invention relates to liquid crystal display backlight driving technology, in particular to a backlight module, a driving method thereof and a liquid crystal display. Background technique [0002] Liquid crystal display is one of the commonly used flat-panel displays, and thinning is one of the development trends of liquid crystal display in response to market demand. Since liquid crystal molecules cannot emit light independently, a backlight module is generally required to provide a light source in a transmissive liquid crystal display. [0003] Liquid crystal display is different from the pulse display mode of traditional cathode ray tube (Cathode Ray Tube; hereinafter referred to as: CRT) display, which will leave visual residue in the human eye when displaying the picture, so there will be smear phenomenon especially in the moving picture ( blur). Several methods exist to solve this problem, including the use of scanning backlights. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F21S8/00F21V13/00F21V7/00F21V11/08G09G3/36G02F1/13357G02F1/133
Inventor 张亮
Owner BOE TECH GRP CO LTD
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