Direct-type backlight unit and driving method thereof and liquid crystal display device

A technology of a backlight module and a driving method, which is applied in lighting devices, optics, light sources, etc., can solve problems such as affecting image contrast, motion blur, and whitening of dark images, and achieve improved image layering, high dynamic range, and improved image quality. Effects of Static Contrast and Dynamic Contrast

Active Publication Date: 2017-09-08
BOE TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] First of all, the dimming in this driving mode can only be changed as a whole. When the brightness of the backlight provided by the direct-lit backlight module is high, the image in the bright scene can be very bright, but the image in the dark scene cannot be darkened. It causes the dark scene image to be whitened, which affects the contrast of the image
In addition, when the direct-type backlight module continuously provides backlight for the LCD panel, especially when the LCD panel displays high-speed moving pictures, based on the principle of persistence of vision of the eyes, a smear effect will appear visually, that is, motion blur phenomenon, which will affect the user's viewing effect

Method used

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  • Direct-type backlight unit and driving method thereof and liquid crystal display device
  • Direct-type backlight unit and driving method thereof and liquid crystal display device
  • Direct-type backlight unit and driving method thereof and liquid crystal display device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Such as figure 1 As shown, this embodiment provides a direct type backlight module 1, the direct type backlight module 1 specifically includes a base plate 2, a plurality of drive units 3 disposed on the base plate 2, and a plurality of light emitting elements disposed on the base plate 2 4. Wherein, each driving unit 3 is correspondingly connected to one light emitting element 4 , and the driving unit 3 is used to control the light-emitting duration and light-emitting brightness of the corresponding light-emitting element 4 .

[0045] Specifically, the base plate 2 used in this embodiment may be a transparent base plate made of glass, and a plurality of driving units 3 may be respectively arranged in the base plate 2 . Since each driving unit 3 is correspondingly connected to a light-emitting element 4, each driving unit 3 can independently control the continuous light-emitting time of the light-emitting element 4 connected to it each time it emits light, and independ...

specific Embodiment approach 1

[0056] Such as Figure 5 As shown, a plurality of driving units 3 are arranged in M ​​rows and N columns, wherein M and N are positive integers greater than 1, respectively.

[0057] The control unit 5 may specifically include a row driving module 51 and a column driving module 52 . Wherein, the row driving module 51 includes M output terminals corresponding to the number of rows of the driving unit 3, and the i-th output terminal of the row driving module 51 is connected with the N driving units 3 in the i-th row driving unit 3, i=1 ~M. The row driving module 51 is used to generate and output the first light emission control signal to the driving unit 3 row by row.

[0058] The column driver module 52 includes N output terminals corresponding to the number of columns of the driver unit 3, and the jth output terminal of the column driver module 52 is connected with the jth driver unit 3 in each row driver unit 3, j=1~N . The column driving module 52 is used to generate and...

specific Embodiment approach 2

[0068] Such as Figure 6 As shown, the control unit 5 may specifically include a light-emitting duration driving module 53 and a light-emitting brightness driving module 54 .

[0069] The output terminals of the light-emitting duration driving module 53 are respectively connected to all the driving units 3 . The light-emitting duration driving module 53 is configured to generate and output a second light-emitting control signal to all the driving units 3 , wherein the second light-emitting control signal is a pulse signal. The driving unit 3 is configured to control the light-emitting duration of the corresponding light-emitting element 4 under the action of the second light-emitting control signal.

[0070] The luminous brightness driving module 54 includes multiple output terminals, and the multiple output terminals of the luminous luminance driving module 54 are connected to the multiple driving units 3 in a one-to-one correspondence. The light emitting brightness driving...

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PUM

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Abstract

The invention provides a direct-type backlight unit and a driving method thereof and a liquid crystal display device, and relates to the technical field of display. The direct-type backlight unit is used for improving the contrast ratio of an image displayed by a liquid crystal panel and preventing the occurrence of a motion blur phenomenon. The direct-type backlight unit comprises a baseboard, multiple driving units arranged on the baseboard and multiple light-emitting elements arranged on the baseboard, wherein each driving unit is correspondingly connected with one light-emitting element, and the driving units are used for controlling the light-emitting duration and the light-emitting luminance of the corresponding light-emitting elements. The direct-type backlight unit is used for providing backlight for the liquid crystal panel.

Description

technical field [0001] The invention relates to the field of display technology, in particular to a direct-lit backlight module, a driving method thereof, and a liquid crystal display device. Background technique [0002] As we all know, the liquid crystal panel of the liquid crystal display device itself does not emit light. The images and digital information displayed by the liquid crystal display device we see are produced by the backlight module on the back of the liquid crystal panel, such as light emitting diode (Light Emitting Diode, hereinafter referred to as The backlight provided by the LED) backlight module is formed by passing through the liquid crystal panel. [0003] According to the arrangement of the light-emitting components in the backlight module, the backlight module can be divided into two types: a side-type backlight module and a direct-type backlight module. Since the direct-type backlight module can transmit the backlight to the liquid crystal panel ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02F1/13357G09G3/34H05B33/08H05B44/00
CPCG02F1/133602G02F1/133603G09G3/3406G09G3/3426H05B45/10G09G2320/064G09G2320/0633G09G2320/0646G09G3/2092
Inventor 时凌云张浩孙海威陈明
Owner BOE TECH GRP CO LTD
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