CN102881262B - LED backlight driving device, LED backlight driving method and LED backlight module - Google Patents
LED backlight driving device, LED backlight driving method and LED backlight module Download PDFInfo
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Abstract
Description
Technical field
The present invention relates to technical field of liquid crystal display, be related specifically to LED-backlit drive unit, method and LED-backlit module.
Background technology
Now, more and more many flat panel TVs use LED-backlit technology. and its advantage is that the life-span is long, power and energy saving, and it is convenient to drive.In LED-backlit module, LED lamp bar is several series connection normally, driven light by the driver module of one or more steady current.Along with the development of 3D technology, 3D technology is also applied in flat panel TV.The mode realizing 3D has multiple, wherein the most ripe, effect is it is preferred that adopt liquid crystal electron light valve spectacles mode. and it is provided with a synchronized transmissions and receiving trap, TV shows the image of left eye and right eye according to certain rules, receiving trap receives the liquid crystal light valve that corresponding synchronizing signal controls right and left eyes respectively, right and left eyes is allowed to see corresponding image respectively, in the brain the image of compound stereoscopic.Because liquid crystal light valve has the delay of opening and turning off, seem like this to produce hangover and ghost image, sometimes also can see the content of another glasses.Liquid crystal light valve has decay to light in addition, therefore during 3D state, picture is darker.Fig. 1 is the driving implementation of the above-mentioned shortcoming of improvement adopted in prior art.Wherein, H01 ~ H04 is four independently LED drivers, R1 and R2 is set the electric current that four drive by current setting circuit simultaneously, and wherein R2 is again by the folding of 2D/3D signal control K1, and then the feed-in electric current under setting 3D pattern.Backlight illumination control signal DIM controls four drivers by controller simultaneously.But because this programme is under 2D/3D pattern, four drivers set electric current by a resistance, error is comparatively large, and the electric current simultaneously under 3D state is again set on the basis of 2D, and error can be larger, when 2D current settings changes, corresponding change is made in the setting of 3D electric current, uses inconvenience.In order to improve precision, just necessarily requiring the precision consistance of four drivers very high, causing cost of manufacture to increase.
Summary of the invention
A kind of error is little, precision is high in order to provide for fundamental purpose of the present invention, the LED-backlit drive unit that cost is low, method and LED-backlit module.
The present invention proposes a kind of LED-backlit drive unit, be connected with at least one paths of LEDs lamp bar, comprise the first driver module, the second driver module, control module and handover module, the first input end of described control module and the second input end receive the input of DIM signal respectively, first output terminal and second output terminal of described control module are connected the input end of described first driver module and the second driver module respectively, and described first driver module is all connected described LED lamp bar with the output terminal of the second driver module; The control input end of described handover module receives the input of 2D or 3D switching signal, and the control output end of described handover module connects the second input end of described control module.
Preferably, described control module comprises the first controller and second controller, the input end of described first controller is the first input end of described control module, receives the input of DIM signal, and the output terminal of described first controller connects the input end of described first driver module; The input end of described second controller is the second input end of described control module, receives the input of DIM signal, and the output terminal of described second controller connects the input end of described second driver module.
Preferably, described first driver module comprises at least one driver, and the output terminal of described first controller connects the input end of each driver of described first driver module respectively; Described second driver module comprises at least one driver, and the output terminal of described second controller connects the input end of each driver of described second driver module respectively; The output terminal of a driver of described first driver module is connected with the output terminal of a driver of the second driver module is common corresponding with a paths of LEDs lamp bar.
Preferably, described handover module comprises change-over switch, and the control input end of described change-over switch receives the input of 2D or 3D switching signal, and the control output end of described change-over switch connects the input end of described second controller, the earth terminal ground connection of described change-over switch.
The present invention also proposes a kind of LED-backlit module, comprise at least one paths of LEDs lamp bar, also comprise LED-backlit drive unit, this LED-backlit drive unit comprises the first driver module, the second driver module, control module and handover module, the first input end of described control module and the second input end receive the input of DIM signal respectively, first output terminal and second output terminal of described control module are connected the input end of described first driver module and the second driver module respectively, and described first driver module is connected described LED lamp bar with the output terminal of the second driver module; The control input end of described handover module receives the input of 2D or 3D switching signal, and the control output end of described handover module connects the second input end of described control module.
The present invention also proposes a kind of method utilizing LED-backlit drive unit to realize LED-backlit driving, comprises step:
When handover module receives 2D switching signal, the second input end short circuit of described control module, the first input end of described control module receives DIM signal, and exports the first driver module to, controls described first driver module driving LED lamp bar;
When handover module receives 3D switching signal, first input end and second input end of described control module receive DIM signal simultaneously, and export the first driver module and the second driver module respectively to, control described first driver module and the second driver module common driving LED lamp bar.
Preferably, described control module comprises the first controller and second controller, and described handover module comprises change-over switch, and described first driver module comprises at least one driver, and described second driver module comprises at least one driver.
Preferably, described when handover module receives 2D switching signal, described control module receives DIM signal, and exports the first driver module to, and the step controlling described first driver module driving LED lamp bar specifically comprises:
When change-over switch receives 2D switching signal, described change-over switch is communicated with, and makes the input end short circuit of described second controller;
Described first controller receives DIM signal;
Described first controller exports each driver of described DIM signal to the first driver module;
Each driver of described first driver module drives corresponding LED lamp bar respectively.
Preferably, it is described when handover module receives 3D switching signal, described control module receives DIM signal, and exports the first driver module and the second driver module to, and the step controlling described first driver module and the second driver module driving LED lamp bar simultaneously specifically comprises:
When change-over switch receives 3D switching signal, described change-over switch blocks;
Described first controller and second controller receive DIM signal simultaneously;
Described first controller exports each driver of described DIM signal to the first driver module, and described second controller exports each driver of described DIM signal to the second driver module;
A driver of described first driver module and a driver of described second driver module drive a corresponding paths of LEDs lamp bar jointly.
The present invention controls the driver module participating in 2D pattern and 3D pattern respectively, make the drive current of participation 2D pattern and 3D pattern separate, do not interfere with each other, effective minimizing error, improve precision, and to each driver module precision consistance without particular/special requirement, structure is simple, effectively reduces the cost of manufacture of whole driving circuit.
Accompanying drawing explanation
Fig. 1 is the electrical schematic diagram of LED-backlit drive unit in prior art;
Fig. 2 is the structural representation of LED-backlit drive unit of the present invention;
Fig. 3 is the electrical schematic diagram of LED-backlit drive unit of the present invention;
Fig. 4 is that the present invention utilizes LED-backlit drive unit to realize the process flow diagram of the method that LED-backlit drives;
Fig. 5 is that the present invention utilizes LED-backlit drive unit to realize the flow chart of steps of 2D pattern in the method for LED-backlit driving;
Fig. 6 is that the present invention utilizes LED-backlit drive unit to realize the flow chart of steps of 3D pattern in the method for LED-backlit driving.
The realization of the object of the invention, functional characteristics and advantage will in conjunction with the embodiments, are described further with reference to accompanying drawing.
Embodiment
Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
As shown in Figure 2, Fig. 2 is the structural representation of LED-backlit drive unit of the present invention.The LED-backlit drive unit 10 that the present embodiment is mentioned, be connected with at least one paths of LEDs lamp bar 20, comprise the first driver module 11, second driver module 12, control module 13 and handover module 14, the first input end of control module 13 and the second input end receive the input of DIM signal respectively, first output terminal and second output terminal of control module 13 are connected the input end of the first driver module 11 and the second driver module 12 respectively, and the first driver module 11 is all connected LED lamp bar 20 with the output terminal of the second driver module 12; The control input end of handover module 14 receives the input of 2D or 3D switching signal 2D/3D, the second input end of the control output end link control module 13 of handover module 14.
When handover module 14 receives 2D switching signal, handover module 14 makes the second input end short circuit of control module 13, second driver module 12 does not work, the first input end of a DIM signal input control module 14, control module 14 controls the first driver module 11 separately to LED lamp bar 20 feed, and driving LED lamp bar 20 is shinny.When handover module 14 receives 3D switching signal, first input end and second input end of control module 14 receive DIM signal simultaneously, control module 14 controls the first driver module 11 simultaneously and the second driver module 12 is common to LED lamp bar 20 feed, and driving LED lamp bar 20 is shinny.During due to 3D pattern, every paths of LEDs lamp bar 20 is all by two driver module corporated feeds, and current doubles, reaches the object that 3D drive current doubles, and effectively improves picture brightness during 3D state.
The present embodiment controls the driver module participating in 2D pattern and 3D pattern respectively, make the drive current of participation 2D pattern and 3D pattern separate, do not interfere with each other, effective minimizing error, improve precision, and to each driver module precision consistance without particular/special requirement, structure is simple, effectively reduces the cost of manufacture of whole driving circuit.
As shown in Figure 3, Fig. 3 is the electrical schematic diagram of LED-backlit drive unit of the present invention.The present embodiment is based on embodiment illustrated in fig. 1, wherein, control module comprises the first controller 131 and second controller 132, and handover module comprises change-over switch K1, the input end of the first controller U1 is the first input end of control module, receives the input of DIM signal; The input end of second controller U2 is the second input end of control module, receives the input of DIM signal; The control input end of change-over switch K1 receives the input of 2D or 3D switching signal 2D/3D, and the control output end of change-over switch K1 connects the input end of second controller U2, the earth terminal ground connection of change-over switch K1.First driver module comprises at least one driver, and the second driver module comprises at least one driver.The present embodiment is for eight driver H1 ~ H8, and the first driver module comprises H1, H3, H5, H7, and the second driver module comprises H2, H4, H6, H8.Wherein, the input end of H1, H3, H5, H7 connects the output terminal of the first controller U1 respectively, and the input end of H2, H4, H6, H8 connects the input end of second controller U2 respectively; The output terminal of H1 with H2 is connected the first lamp bar D1, and the output terminal of H3 with H4 is connected the second lamp bar D2, and the output terminal that the output terminal of H5 with H6 is connected the 3rd lamp article D3, H7 and H8 is connected the 4th lamp article D4.
When change-over switch K1 receives 2D switching signal, K1 is communicated with, and makes the input end short circuit of second controller U2, DIM signal one tunnel first controller U1 exports H1, H3, H5, H7 to, control H1, H3, H5, H7 work, and H1, H3, H5, H7, respectively to D1 ~ D4 feed, drive D1 ~ D4 shinny; Another road is shorted to ground through K1, and H2, H4, H6, H8 do not work.When change-over switch K1 receives 3D switching signal, K1 blocks, and the first controller U1 and second controller U2 receives DIM signal simultaneously; U1 exports DIM signal to H1, H3, H5, H7, and control H1, H3, H5, H7 work, and U2 exports DIM signal to H2, H4, H6, H8, and control H2, H4, H6, H8 work; H1 and H2 is to D1 feed, and the common D1 that drives is shinny; H3 and H4 is to D2 feed, and the common D2 that drives is shinny; H5 and H6 is to D3 feed, and the common D3 that drives is shinny; H7 and H8 is to D4 feed, and the common D4 that drives is shinny.Because each lamp bar carrys out feed, current doubles by two drivers, reach the object that 3D drive current doubles, effectively improve picture brightness during 3D state.
In the present embodiment, owing to controlling the driver participating in 2D pattern and 3D pattern respectively, make the drive current of participation 2D pattern and 3D pattern separate, do not interfere with each other, effective minimizing error, improves precision, and to each driver precision consistance without particular/special requirement, structure is simple, effectively reduces the cost of manufacture of whole driving circuit.
The embodiment of the present invention also proposes a kind of LED-backlit module, comprise at least one paths of LEDs lamp bar, also comprise LED-backlit drive unit, this LED-backlit drive unit comprises the first driver module, the second driver module, control module and handover module, the first input end of control module and the second input end receive the input of DIM signal respectively, first output terminal and second output terminal of control module are connected the input end of the first driver module and the second driver module respectively, and the first driver module is connected LED lamp bar with the output terminal of the second driver module; The control input end of handover module receives the input of 2D or 3D switching signal, the second input end of the control output end link control module of handover module.
The LED-backlit drive unit that LED-backlit module in the present embodiment comprises can comprise above-mentioned Fig. 2 and embodiment illustrated in fig. 3 in all technical schemes, its detailed construction can refer to previous embodiment, and therefore not to repeat here.Owing to adopting the scheme of above-mentioned LED-backlit drive unit, the relatively existing LED-backlit module of LED-backlit module of the present invention, the drive current participating in 2D pattern and 3D pattern is separate, do not interfere with each other, effective minimizing error, improves precision, and to each driver module precision consistance without particular/special requirement, structure is simple, effectively reduces the cost of manufacture of whole LED-backlit module.
As shown in Figure 4, Fig. 4 is that the present invention utilizes LED-backlit drive unit to realize the process flow diagram of the method that LED-backlit drives.The method utilizing LED-backlit drive unit to realize LED-backlit driving of the present embodiment comprises:
Step S10, when handover module receives 2D switching signal, the second input end short circuit of control module, the first input end of control module receives DIM signal, and exports the first driver module to, controls the first driver module driving LED lamp bar;
In 2 d mode, handover module makes the second input end short circuit of control module, and the second driver module does not work, and DIM signal only inputs to the first input end of control module, control module controls the first driver module separately to LED lamp bar 20 feed, and driving LED lamp bar is shinny.
Step S20, when handover module receives 3D switching signal, first input end and second input end of control module receive DIM signal simultaneously, and export the first driver module and the second driver module respectively to, control the first driver module and the second driver module common driving LED lamp bar.
In 3 d mode, DIM signal inputs to first input end and second input end of control module simultaneously, and control module controls the first driver module and the second driver module jointly to LED lamp bar feed simultaneously, and driving LED lamp bar is shinny.During due to 3D pattern, every paths of LEDs lamp bar is all by two driver module corporated feeds, and current doubles, reaches the object that 3D drive current doubles, and effectively improves picture brightness during 3D state.
The present embodiment controls the driver module participating in 2D pattern and 3D pattern respectively, make the drive current of participation 2D pattern and 3D pattern separate, do not interfere with each other, effective minimizing error, improve precision, and to each driver module precision consistance without particular/special requirement, structure is simple, effectively reduces the cost of manufacture of whole driving circuit.
As shown in Figure 5, Fig. 5 is that the present invention utilizes LED-backlit drive unit to realize the flow chart of steps of 2D pattern in the method for LED-backlit driving.The present embodiment is based on embodiment illustrated in fig. 4, and wherein, control module comprises the first controller and second controller, and handover module comprises change-over switch, and the first driver module comprises at least one driver, and the second driver module comprises at least one driver.
In 2 d mode, step S10 specifically comprises:
Step S11, when change-over switch receives 2D switching signal, change-over switch is communicated with, and makes the input end short circuit of second controller;
DIM signal one tunnel connects the first controller input end, and another road connects the input end of second controller, and change-over switch is connected to the input end of second controller.In 2 d mode, change-over switch is communicated with, and will connect a road DIM signal shorts of the input end of second controller to ground, each driver of second controller and the second driver module does not all work.
Step S12, the first controller receives DIM signal;
When the input end short circuit of second controller, DIM signal is only input to the first controller.
Step S13, the first controller exports each driver of DIM signal to the first driver module;
First controller controls each drive operation of the first driver module.
Step S14, each driver of the first driver module drives corresponding LED lamp bar respectively.
LED lamp bar is only by each driver feed-in drive current of the first driver module.
In the present embodiment, in 2 d mode, each driver of second controller and the second driver module does not work, LED lamp bar is only by each driver drives of the first driver module, and the drive current participating in 2D pattern does not affect by the drive current participating in 3D pattern, effectively can reduce the drive current error participating in 2D pattern, improve precision, and to each driver precision consistance without particular/special requirement, structure is simple, effectively reduces the cost of manufacture of whole driving circuit.
As shown in Figure 6, Fig. 6 is that the present invention utilizes LED-backlit drive unit to realize the flow chart of steps of 3D pattern in the method for LED-backlit driving.The present embodiment is equally based on embodiment illustrated in fig. 4, and wherein, control module comprises the first controller and second controller, and handover module comprises change-over switch, and the first driver module comprises at least one driver, and the second driver module comprises at least one driver.
In 3 d mode, step S20 specifically comprises:
Step S21, when change-over switch receives 3D switching signal, change-over switch blocks;
DIM signal one tunnel connects the first controller input end, and another road connects the input end of second controller, and change-over switch is connected to the input end of second controller.In 3 d mode, change-over switch blocks, and namely change-over switch does not access the input circuits such as second controller.
Step S22, the first controller and second controller receive DIM signal simultaneously;
DIM signal exports the first controller and second controller to simultaneously.
Step S23, the first controller exports each driver of DIM signal to the first driver module, and second controller exports each driver of DIM signal to the second driver module;
First controller controls each drive operation of the first driver module, and second controller controls each drive operation of the second driver module.
Step S24, a driver of the first driver module and a driver of the second driver module drive a corresponding paths of LEDs lamp bar jointly.
LED lamp bar receives the drive current of each driver feed-in in the first driver module and the second driver module simultaneously.
In the present embodiment, in 3 d mode, LED lamp bar is simultaneously by each driver drives of the first driver module and the second driver module, and current doubles, reaches the object that 3D drive current doubles, and effectively improves picture brightness during 3D state.Meanwhile, the drive current participating in 3D pattern does not affect by the drive current participating in 2D pattern, effectively can reduce the drive current error participating in 3D pattern, improve precision, and to each driver precision consistance without particular/special requirement, structure is simple, effectively reduces the cost of manufacture of whole driving circuit.
The foregoing is only the preferred embodiments of the present invention; not thereby the scope of the claims of the present invention is limited; every utilize instructions of the present invention and accompanying drawing content to do equivalent structure or equivalent flow process conversion; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present invention.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8982521B2 (en) | 2013-01-21 | 2015-03-17 | Shenzhen China Star | Overvoltage protection method for backlight driver |
| CN103050096B (en) * | 2013-01-21 | 2015-10-28 | 深圳市华星光电技术有限公司 | Backlight drive circuit overvoltage protection method |
| CN103165085B (en) * | 2013-03-29 | 2016-06-29 | 深圳市华星光电技术有限公司 | A kind of backlight drive circuit and driving method thereof and liquid-crystal apparatus |
| US8890423B2 (en) | 2013-03-29 | 2014-11-18 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Backlight driving circuit, LCD device, and method for driving backlight driving circuit |
| CN103280193B (en) * | 2013-05-28 | 2015-11-25 | 深圳市华星光电技术有限公司 | A kind of backlight drive circuit, liquid crystal indicator and backlight driving method |
| US9271361B2 (en) | 2013-05-28 | 2016-02-23 | Shenzhen China Star Optoelectronics Technology Co., Ltd | Backlight driving circuit, LCD device, and method for driving the backlight driving circuit |
| CN103957644B (en) * | 2014-05-14 | 2017-04-26 | 深圳市华星光电技术有限公司 | LED backlight source for liquid crystal display device |
| CN106910476B (en) * | 2017-04-28 | 2020-01-24 | 昆山龙腾光电股份有限公司 | Backlight driving circuit, driving method, backlight system and display device |
| CN107731163B (en) * | 2017-10-30 | 2019-10-18 | 合肥鑫晟光电科技有限公司 | Pixel-driving circuit and its driving method, display device |
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| CN101313632A (en) * | 2005-12-12 | 2008-11-26 | 三菱电机株式会社 | Light emitting diode lighting device and vehicle light lighting device using same |
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| KR101416228B1 (en) * | 2007-07-06 | 2014-07-08 | 삼성전자주식회사 | Driving apparatus of 2D/3D switchable display and driving method thereof |
| KR100918065B1 (en) * | 2008-03-31 | 2009-09-18 | 삼성모바일디스플레이주식회사 | Display device and the driving method thereof |
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| CN101313632A (en) * | 2005-12-12 | 2008-11-26 | 三菱电机株式会社 | Light emitting diode lighting device and vehicle light lighting device using same |
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