CN108597458A - LOCAL DIMMING backlight drive circuits, Apparatus and liquid crystal display equipment - Google Patents
LOCAL DIMMING backlight drive circuits, Apparatus and liquid crystal display equipment Download PDFInfo
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- CN108597458A CN108597458A CN201810391332.5A CN201810391332A CN108597458A CN 108597458 A CN108597458 A CN 108597458A CN 201810391332 A CN201810391332 A CN 201810391332A CN 108597458 A CN108597458 A CN 108597458A
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- Prior art keywords
- row driving
- driving switch
- local dimming
- backlight drive
- dimming backlight
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
Abstract
The present invention discloses a kind of LOCAL DIMMING backlight drive circuits, Apparatus and liquid crystal display equipment, the circuit includes L LED driver, L*N row driving switch, a row driving switch of L* (16 N) and backlight module, backlight module includes L* (16 N) group LED light bars, and the quantity of each group of LED light bar is N；Multiple control terminals of each LED driver and the controlled end of N number of row driving switch and (16 N) a row driving switch connect one to one；Input terminal per a line driving switch is for accessing DC power supply, it is correspondingly connected with the LED light bar in (16 N) group per the output end of a line driving switch, the cathode and the input terminal of (16 N) a row driving switch of (16 N) group LED light bar connect one to one, the output end ground connection of row driving switch.The present invention improves the driving utilization rate of single led driver.
Description
Technical field
The present invention relates to backlight display technical field, more particularly to a kind of LOCAL DIMMING backlight drive circuits, device
And liquid crystal display.
Background technology
Currently, more and more computer, TVs etc. use liquid crystal display device to Local with backlight driving system
Dimming backlight technologies (region backlight technology), and with the development of technology, backlight subarea number has increased trend.One piece
Traditional Local dimming driving chips can generally drive the LED light bar in 16 channels, in the big ruler for needing many subregions
In very little television backlight, the driving chip of corresponding number is thus needed to configure so that the cost of backlight drive increases, to limit
Application of the local dimming backlight technologies on low and middle-end machine.
Invention content
The main object of the present invention is that a kind of LOCAL DIMMING backlight drive circuits of proposition, device and liquid crystal display are set
It is standby, it is intended to improve the driving utilization rate of single led driver.
To achieve the above object, the present invention proposes a kind of LOCAL DIMMING backlight drive circuits, the LOCAL
DIMMING backlight drive circuits include L LED driver, L*N row driving switch, a row driving switch of L* (16-N) and the back of the body
Optical mode group, the backlight module include L* (16-N) group LED light bars, and the quantity of each group of LED light bar is N；Each LED drives
Multiple control terminals of dynamic device are corresponded with the controlled end of N number of row driving switch and (16-N) a described row driving switch to be connected
It connects；The input terminal of each row driving switch for accessing DC power supply, the output end of each row driving switch with
A LED light bar in (16-N) group is correspondingly connected with, and (16-N) organizes the cathode of the LED light bar and (16-N) a described row drive
The input terminal of dynamic switch connects one to one, the output end ground connection of the row driving switch；Wherein,
The L LED drivers control signal for output timing, are connected line by line with controlling L*N row driving switch,
And output row driving control signal, to control a row driving switch closure/shutdowns of L* (16-N)；
L is greater than or equal to 1, N and is greater than or equal to 2, and is less than or equal to 8.
Preferably, the LOCAL DIMMING backlight drive circuits include L LOCAL DIMMING backlight drive branch,
LOCAL DIMMING backlight drive branch circuit parallel connections described in L items are arranged；Wherein,
Each LOCAL DIMMING backlight drives branch include a LED driver, N number of row driving switch and
(16-N) a row driving switch.
Preferably, the LOCAL DIMMING backlight drive circuits further include MCU, the MCU respectively with the L items
LOCAL DIMMING backlight drive branches connect；The MCU is used to receive external control instruction, and control signal is carried out
It is exported to each LED driver after demodulation.
Preferably, the LOCAL DIMMING backlight drive circuits further include communicating circuit, and the communicating circuit series connection is set
It is placed between the MCU and the LED driver.
Preferably, the LOCAL DIMMING backlight drive circuits further include driving power, the output of the driving power
End is connect with the L*N row driving switch input terminals；
The driving power, for corresponding row driving switch closure and L* in the L*N row driving switch
When corresponding row driving switch is closed in (16-N) a described row driving switch, corresponding LED light in the backlight module is driven
Group work.
Preferably, which is characterized in that the LED driver includes multiple row driving registers and the driving deposit of multiple row
Device, multiple row driving registers are for generating timing control signal and exporting, and multiple row driving registers are for producing
Raw row driving control signal simultaneously exports.
Preferably, the LED driver further includes current control register, and the current control register is for generating electricity
Stream adjusting control signal simultaneously exports.
The present invention also proposes a kind of LOCAL DIMMING backlight drive devices, including LOCAL DIMMING as described above
Backlight drive circuit；The LOCAL DIMMING backlight drive circuits include L LED driver, L*N row driving switch, L*
(16-N) a row driving switch and backlight module, the backlight module include L* (16-N) group LED light bars, each group of LED light bar
Quantity be N；Multiple control terminals of each LED driver are driven with a row of N number of row driving switch and (16-N)
The controlled end of dynamic switch connects one to one；The input terminal of each row driving switch is for accessing DC power supply, Mei Yisuo
The output end for stating row driving switch is correspondingly connected with the LED light bar in (16-N) group, and (16-N) organizes the LED light bar
Cathode and the input terminal of (16-N) a described row driving switch connect one to one, the output of row driving switch termination
Ground；Wherein, the L LED drivers control signal for output timing, are connected line by line with controlling L*N row driving switch,
And output row driving control signal, to control a row driving switch closure/shutdowns of L* (16-N)；
L is greater than or equal to 1, N and is greater than or equal to 2, and is less than or equal to 8.
The present invention also proposes a kind of liquid crystal display, including LOCAL DIMMING backlight drive devices as described above.
LOCAL DIMMING backlight drive circuits of the present invention are arranged L according to the backlight module quantity of liquid crystal display
LED driver, L*N row driving switch, a row driving switch of L* (16-N) and backlight module, backlight module include L* (16-N)
The quantity of group LED light bar, each group of LED light bar is N；And the output end per a line driving switch with one in (16-N) group
LED light bar is correspondingly connected with, and the cathode and the input terminal of (16-N) a row driving switch of (16-N) group LED light bar connect one to one
To constitute the driving circuit of LED light group, and correspondence is generated according to the quantity of row driving switch by LED driver LED driver
The timing control signal of quantity, and export to corresponding row driving switch, line by line with the driving row driving switch of property performance period
It is closed, and when receiving externally input LOCAL DIMMING signals, controls corresponding row driving switch and be closed, to drive
The LED light bar that dynamic row driving switch and row driving switch are closed at is lighted, to realize local backlight driving/adjusting.So
Setting so that driving N number of row driving switch and (16-N) a row driving switch using a LED driver, can drive
20 even 64 LED light bar work, improve the driving capability of single led driver.The present invention is single by improving
The driving utilization rate of a LED driver configures quantity to reduce LED driver on the whole, solves the multiple driving cores of control
Piece works at the same time, and leads to the problem of the control algolithm complexity of MCU, and present invention reduces the production cost of backlight drive and design are difficult
Degree.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
The structure shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the high-level schematic functional block diagram of one embodiment of LOCAL DIMMING backlight drive circuits of the present invention；
Fig. 2 is the electrical block diagram of one embodiment of LOCAL DIMMING backlight drive circuits in Fig. 1；
Fig. 3 is the high-level schematic functional block diagram of another embodiment of LOCAL DIMMING backlight drive circuits of the present invention.
The embodiments will be further described with reference to the accompanying drawings for the realization, the function and the advantages of the object of the present invention.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiment is only a part of the embodiment of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, those of ordinary skill in the art obtained without creative efforts it is all its
His embodiment, shall fall within the protection scope of the present invention.
If it is to be appreciated that related in the embodiment of the present invention directionality instruction (such as up, down, left, right, before and after ...),
Then directionality instruction be only used for explaining relative position relation under a certain particular pose (as shown in the picture) between each component,
Motion conditions etc., if the particular pose changes, directionality instruction also correspondingly changes correspondingly.
If in addition, relating to the description of " first ", " second " etc. in the embodiment of the present invention, it is somebody's turn to do " first ", " second " etc.
Description be used for description purposes only, be not understood to indicate or imply its relative importance or implicitly indicate indicated skill
The quantity of art feature." first " is defined as a result, the feature of " second " can explicitly or implicitly include at least one spy
Sign.In addition, the technical solution between each embodiment can be combined with each other, but must be with those of ordinary skill in the art's energy
It is enough realize based on, when the knot that conflicting or cannot achieve when will be understood that this technical solution occurs in the combination of technical solution
Conjunction is not present, also not the present invention claims protection domain within.
The present invention proposes a kind of LOCAL DIMMING backlight drive circuits.
The liquid crystal display, which can be mobile phone, tablet computer, laptop, palm PC, LCD TV etc., to be had
The display device of display panel.LCD TV can be TFT-LCDTFT-LCD (Thin Film Transistor Liquid
Crystal Display, thin-film transistor LCD device) etc. liquid crystal display devices.
In LCD TV, it is provided with LOCALDIMMIN backlight timesharing driving circuits mostly to drive backlight LED light work
Make, LOCALDIMMIN backlight timesharing driving circuits play non-in the density for improving back light, reduction driving cost etc.
Normal important role, therefore the LOCALDIMMING circuits of timesharing driving can be applied and need to further increase backlight subarea quantity
High Resolution and Large Size TV in.
More and more LCD colour TVs use LED backlight technology, using LED backlight technology LCD colour TVs the advantages of be the longevity
Order length, power and energy saving, driving conveniently.There are two types of LED backlight schemes：One is straight-down negatives, are placed directly under screen by several lamps
Face；Another kind is side entering type, and several lamps are distributed in the periphery of screen, and light is uniformly oriented to LCD screen by light guide plate.Above two
LED backlight scheme is all applied very universal, and wherein straight-down negative has the advantages that more, and most important advantage can be achieved on LOCAL
DIMMING (local backlight adjusting) function.So-called LOCAL DIMMING will exactly shield subsequent lamp and be divided into several groups, and such as 32
Group, 64 groups, 128 groups, every group forms series system by several lamp beads, and it is more usually to organize number, gets thinner, and dimming effect is better,
The brightness of every group of lamp is determined by the brightness of picture so that the effect of display is more preferable, more energy efficient power saving.LOCAL DIMMING systems
System is divided into driving device and lamp bar, and driving device receives the LOCAL DIMMING that T-CON plates or mainboard provide by special driving IC
Signal, and the driver in several 16 channels is sent to after LOCAL DIMMING signals are demodulated.
That is, a driver can drive 16 groups of LED light group work, and so on, 32 groups of LED light groups then need
Two drivers, 64 groups then need four drivers, 128 groups then need eight drivers to carry out work, in large size TV backlight
In the case of, need many subregions.Multiple driving chips are thus needed to configure to realize, and the cost of driving chip is higher, and
And the multiple driving chips of control work at the same time, and also cause the control algolithm of MCU complicated, increase backlight drive production cost and
Design difficulty limits application and development of the local dimming backlight technologies on low and middle-end machine.
Referring to Fig.1, in an embodiment of the present invention, which includes L LED driving
Device 10, L*N row driving switch 20, a row driving switch 30 of L* (16-N) and backlight module 40, the backlight module 40 include
L* (16-N) organizes LED light bar, and the quantity of each group of LED light bar is N；Multiple control terminals of each LED driver and N number of institute
The controlled end for stating row driving switch and (16-N) a described row driving switch connects one to one；Each N number of row driving switch
Input terminal for accessing DC power supply, the output end of each row driving switch with the LED in (16-N) group
Lamp bar is correspondingly connected with, and (16-N) organizes the cathode of the LED light bar and one a pair of input terminal of (16-N) a described row driving switch
It should connect, the output end ground connection of (16-N) a described row driving switch；Wherein,
The L LED drivers control signal for output timing, are led line by line with controlling L*N row driving switch 20
It is logical, and output row driving control signal, to control a row driving switch closure/shutdowns of L* (16-N)；
L is greater than or equal to 1, N and is greater than or equal to 2.
In the present embodiment, lamp group or be lamp bar, modes of emplacement can be horizontal or be vertically arranged mode, foundation in every lamp bar
The lamp of different number can be arranged in the different sizes of screen, usually there is 4 to 10 lamps.Row driving switch can be triode, MOS
The switching tubes such as pipe, IGBT, TFT are realized, or can also be realized using electronic switches such as relays.
The quantity of L can be one, or more than one, it specifically can be according to liquid crystal display, such as mobile phone/flat
Plate computer/size of laptop/palm PC/LCD TV namely 40 quantity of backlight module of liquid crystal display are set
It sets.Such as in 55 cun of LCD TV, the group number of lamp bar is generally 128 groups, and the quantity of L then could be provided as 2 at this time.In pen
Remember this computer etc., then the quantity of L then could be provided as 1.In practical application, specifically can be according to design requirement, such as dim
Effect, brightness etc. are configured, and are not limited herein.
With reference to Fig. 2, it is to be understood that be set as 1 in LOCAL DIMMING backlight drive circuit LED drivers
In embodiment, LED driver includes 16 control signal outputs (PWM1~PWM16), and the quantity of N could be provided as two
It is a or more than two, it is that N is arranged in LOCAL DIMMING backlight drive circuits with reference to Fig. 2, Fig. 2 when N is set as two
Electrical block diagram when being 2.In Fig. 2, the quantity of row driving switch is two (K1, K2), then the quantity of row driving switch
For 14 (K3~K16), in corresponding backlight module 40, including 14 groups of LED light bars, the quantity of each group of LED light bar is 2
Item, (D1A, D1B)；(D2A、D2B)；…(D14A、D14B).The sum of LED light bar is 2*14 items namely a LED driver
28 lamp bars can be driven to light simultaneously either to extinguish or a driver can drive the brightness of 28 lamp bars simultaneously.Work as N
Quantity when being set as three, also the quantity of driving switch is three at once, then the quantity of row driving switch is 13, corresponding
Backlight module 40 in, the quantity of including 13 groups of LED light bars, each group of LED light bar is 3.The sum of LED light bar is 3*13
Item namely a LED driver can drive 39 lamp bars to light or extinguish simultaneously.Or a driver can drive simultaneously
Move the brightness of 39 lamp bars.And so on, when the quantity of row driving switch is arranged eight, then the quantity of row driving switch is same
It is eight, in corresponding backlight module 40, including 8 groups of LED light bars, the quantity of each group of LED light bar is 8.LED light bar it is total
Number is 8*8 items namely a LED driver can drive 64 lamp bars to light or extinguish simultaneously.Or a driver can
To drive the brightness of 64 lamp bars simultaneously.
In the present embodiment, LED driver generates the timing control signal of corresponding number according to the quantity of row driving switch, and
Output is closed to corresponding row driving switch with the driving row driving switch of property performance period line by line, and external defeated receiving
It when the LOCAL DIMMING signals entered, controls corresponding row driving switch and is closed, to drive row driving switch and row driving to open
It closes the LED light bar being closed to light, to realize the purpose of LOCAL DIMMING (local backlight adjusting).Wherein, LOCAL
DIMMING signals include LED light drive signal and brightness regulation control signal, and LED light drive signal can be for controlling
The control signal that LED light is lighted/extinguished；Brightness regulation controls signal can be by the row drive signal that LED driver exports
Size is realized to control the conducting degree of row driving switch.By adjust row driving switch conducting degree come control output to
The size of current of LED light, to realize the brightness for adjusting LED light.LED driver can be controlled according to LOCAL DIMMING signals
One row driving switch is closed, and can also be controlled multiple row driving switch simultaneously and is closed, not be limited herein.
L is arranged according to 40 quantity of backlight module of liquid crystal display in LOCAL DIMMING backlight drive circuits of the present invention
A LED driver 10, L*N row driving switch 20, a row driving switch 30 of L* (16-N) and backlight module 40, backlight module 40
LED light bar is organized including L* (16-N), the quantity of each group of LED light bar is N；And the output end per a line driving switch with (16-
N) LED light bar in group is correspondingly connected with, and (16-N) organizes the input terminal one of the cathode and (16-N) a row driving switch of LED light bar
One is correspondingly connected with to constitute the driving circuit of LED light group, and by LED driver LED driver according to the number of row driving switch
Amount generates the timing control signal of corresponding number, and exports to corresponding row driving switch, is driven with the driving row of property performance period
Dynamic switch is closed line by line, and when receiving externally input LOCAL DIMMING signals, is controlled corresponding row driving switch and is closed
Close, to which the LED light bar for driving row driving switch and row driving switch to be closed at is lighted, to realize local backlight driving/
It adjusts.It is arranged such so that N number of row driving switch and (16-N) a row driving switch are being driven using a LED driver,
20 even 64 LED light bar work can be driven, the driving capability of single led driver is improved.The present invention is logical
The driving utilization rate for improving single led driver is crossed, quantity is configured to reduce LED driver on the whole, it is more to solve control
A driving chip works at the same time, and leads to the problem of the control algolithm complexity of MCU, present invention reduces the production costs of backlight drive
And design difficulty.
It is understood that circuit structure of the present invention is simple, it is easy to accomplish, local dimming backlight technologies can be wide
It is general to be applied in low and middle-end machinery equipment, accelerate the development of local dimming backlight technologies.
Referring to figs. 1 to Fig. 3, in above-described embodiment, the LOCAL DIMMING backlight drive circuits include L LOCAL
DIMMING backlight drive branches, LOCAL DIMMING backlight drive branch circuit parallel connections setting described in L items；Wherein,
Each LOCAL DIMMING backlight drives branch include a LED driver, N number of row driving switch and
(16-N) a row driving switch.
With reference to Fig. 3, in the present embodiment, according to the size of liquid crystal display or the setting group number of backlight module 40, L
Quantity could be provided as 1 or 2, it is even more.Fig. 3 is that LOCAL DIMMING backlight drive circuits include L LOCAL
The electrical block diagram of DIMMING backlight drive branches.In figure, LOCAL DIMMING backlight drive branches are denoted as respectively
LOCAL DIMMING backlight drives branch 101 and 102.It is understood that the quantity of L is more namely the group of backlight module 40
Number is more, and the backlight area of liquid crystal display is then got thinner, and dimming effect is also better, the effect that the brightness of every group of lamp is shown
Fruit is also more preferable, more energy efficient power saving.
In each LOCAL DIMMING backlight drive branches, there are one LED drivers for tool, and are driven based on the LED
The row driving switch and row driving switch of device drive control.16 control signal outputs of LED driver are opened with row driving
It closes and row driving switch connects one to one, also the sum of driving switch and row driving switch is 16 at once.Each
Two row driving switch are included at least in LOCAL DIMMING backlight drive branches, when the quantity of row driving switch is two,
The quantity of row driving switch is 14；When the quantity of row driving switch is three, the quantity of row driving switch is 13；
When the quantity of row driving switch is four, the quantity of row driving switch is 12；An and LOCAL DIMMING backlight
It drives in branch, the quantity of row driving switch at most may be configured as eight, and the quantity of row driving switch is also eight, at this time backlight
Module 40 could be provided as eight groups, and eight groups of backlight modules 40 include eight LED light bars.It is arranged such so that a LED driving
Device can drive 64 LED light bars simultaneously, be conducive to the utilization rate for improving single led driver, reduce LOCAL
In DIMMING backlight drive devices, the configuration quantity of LED driver entirety, to reduce the production cost of backlight drive.And
It solves when MCU controls multiple driving chips and works at the same time, the problem of the control algolithm complexity inside MCU thereby reduces
The design difficulty of backlight drive.
Referring to figs. 1 to Fig. 3, in a preferred embodiment, the LOCAL DIMMING backlight drive circuits further include MCU,
The MCU is connect with the L LOCAL DIMMING backlight drive branches respectively；The MCU is used to receive external control and refers to
It enables, and is exported to each LED driver after control signal is demodulated.
In the present embodiment, MCU is the master controller of backlight drive circuit, and the collection such as DSP, FPGA, microcontroller may be used in MCU
It is realized at control chip, the present embodiment is preferably realized using microcontroller, and A/D conversion circuits are integrated in microcontroller, are compared
The hardware modules such as device, memory, data processor, and be stored on the memory and can be transported on the data processor
Capable software program and/or module, by running or executing the software program and/or module that are stored in memory, receiving liquid
The LOCAL DIMMING signals that mainboard in sequential T-CON plates or display in crystal display provides, and by LOCAL
It is exported to corresponding LED driver after the demodulation of DIMMING signals.It will also be appreciated that in other embodiments, such as in liquid
In brilliant TV, MCU can also be realized using SOC, the LOCAL DIMMING signals after SOC output conciliations to LED driver,
Directly control LED driver work.
Referring to figs. 1 to Fig. 3, in a preferred embodiment, the LOCAL DIMMING backlight drive circuits further include communication
Circuit 50, the communicating circuit 50 are arranged in series between the MCU and the LED driver.
In the present embodiment, communicating circuit 50 is preferably SPI communication interfaces, four communication buses difference of SPI communication interfaces
It is connect with MCU with LED driver, to realize the communication connection of MCU and LED driver, to be communicated in MCU and LED driver
When, by the LOCAL DIMMING signals after conciliation to LED driver, to control LED driver work.
Referring to figs. 1 to Fig. 3, in a preferred embodiment, the LOCAL DIMMING backlight drive circuits further include driving
Power supply 60, the output end of the driving power 60 are connect with the L*N row driving switch input terminals；
The driving power 60, for corresponding row driving switch closure and L* in the L*N row driving switch
When corresponding row driving switch is closed in (16-N) a described row driving switch, corresponding LED in the backlight module 40 is driven
Lamp group works.
In the present embodiment, driving power 60 is for after the driving power 60 of access is converted to DC power supply, exporting to row
Driving switch, with corresponding row driving switch be closed line by line and corresponding row driving switch be closed when, DC power supply is defeated
Go out to LED light bar corresponding with row driving switch and row driving switch, to drive the LED light bar to work.Driving power 60 is defeated
Going out the size of DC power supply can set according to the lamp bead quantity on the model specification of LED light bar and each LED light bar.
Referring to figs. 1 to Fig. 3, in a preferred embodiment, the LED driver includes that (figure is not for multiple row driving registers
Show) and multiple row driving register (not shown), multiple row driving registers are for generating timing control signal simultaneously
Output, multiple row driving registers are for generating row driving control signal and exporting.
In the present embodiment, the quantity etc. of quantity, the setting of row driving switch that LED driver is arranged according to row driving switch is set
The register of corresponding number is set, and the timing control signal of generation/row driving control signal is exported to corresponding driving switch,
To drive row driving switch and row driving switch to work.
Referring to figs. 1 to Fig. 3, in a preferred embodiment, the LED driver further includes that (figure is not for current control register
Show), the current control register is for generating current regulation control signal and exporting.
In the present embodiment, it is to be understood that LOCAL DIMMING backlight drive circuits are additionally provided with current detecting electricity
Road, voltage detecting circuit, temperature sensing circuit and LED protection circuit etc., current detection circuit, voltage detecting circuit and temperature inspection
Slowdown monitoring circuit is connect with MCU respectively, and MCU is according to the inspections of the outputs such as current detection circuit, voltage detecting circuit and temperature sensing circuit
Signal is surveyed, exports corresponding control signal to LED driver, to make LED driver generate corresponding current controling signal simultaneously
Output is to corresponding row driving switch, to realize to LED light defencive function.
The present invention also proposes a kind of LOCAL DIMMING backlight drive devices, the LOCAL DIMMING backlight drives dress
It sets including B and LOCAL DIMMING backlight drive circuits as described above.The LOCAL DIMMING backlight drive circuits it is detailed
Fine texture can refer to above-described embodiment, and details are not described herein again；It is understood that due to being carried on the back in LOCAL DIMMING of the present invention
Above-mentioned LOCAL DIMMING backlight drive circuits have been used in drive unit, therefore, LOCAL DIMMING backlights of the present invention
The embodiment of driving device includes whole technical solutions of above-mentioned LOCAL DIMMING backlight drive circuit whole embodiments, and
The technique effect reached is also identical, and details are not described herein.
The present invention also proposes a kind of liquid crystal display, including LOCAL DIMMING backlight drive devices as described above.
The foregoing is merely the preferred embodiment of the present invention, are not intended to limit the scope of the invention, every at this
Under the inventive concept of invention, using equivalent structure transformation made by description of the invention and accompanying drawing content, or directly/use indirectly
In the scope of patent protection that other related technical areas are included in the present invention.
Claims (9)
1. a kind of LOCAL DIMMING backlight drive circuits, which is characterized in that the LOCALDIMMING backlight drive circuits packet
Include L LED driver, L*N row driving switch, a row driving switch of L* (16-N) and backlight module, the backlight module packet
L* (16-N) group LED light bars are included, the quantity of each group of LED light bar is N；Multiple control terminals of each LED driver with it is N number of
The controlled end of the row driving switch and (16-N) a described row driving switch connects one to one；Each row driving switch
Input terminal for accessing DC power supply, the output end of each row driving switch with the LED in (16-N) group
Lamp bar is correspondingly connected with, and (16-N) organizes the cathode of the LED light bar and one a pair of input terminal of (16-N) a described row driving switch
It should connect, the output end ground connection of the row driving switch；Wherein,
The L LED drivers control signal for output timing, are connected line by line with controlling L*N row driving switch, and
Row driving control signal is exported, to control a row driving switch closure/shutdowns of L* (16-N)；
L is greater than or equal to 1, N and is greater than or equal to 2, and is less than or equal to 8.
2. LOCAL DIMMING backlight drive circuits as described in claim 1, which is characterized in that the LOCAL DIMMING
Backlight drive circuit includes L LOCAL DIMMING backlight drive branch, LOCAL DIMMING backlight drive branches described in L items
It is arranged in parallel；Wherein,
Each LOCAL DIMMING backlight drives branch includes a LED driver, N number of row driving switch and (16-N)
A row driving switch.
3. LOCAL DIMMING backlight drive circuits as claimed in claim 2, which is characterized in that the LOCAL DIMMING
Backlight drive circuit further includes MCU, and the MCU is connect with the L LOCAL DIMMING backlight drive branches respectively；It is described
MCU is used to receive external control instruction, and is exported to each LED driver after control signal is demodulated.
4. LOCAL DIMMING backlight drive circuits as claimed in claim 3, which is characterized in that the LOCAL DIMMING
Backlight drive circuit further includes communicating circuit, and the communicating circuit is arranged in series between the MCU and the LED driver.
5. LOCAL DIMMING backlight drive circuits as described in claim 1, which is characterized in that the LOCAL DIMMING
Backlight drive circuit further includes driving power, and the output end of the driving power connects with the L*N row driving switch input terminals
It connects；
The driving power, for corresponding row driving switch closure and L* (16-N) in the L*N row driving switch
When corresponding row driving switch is closed in a row driving switch, corresponding LED light group work in the backlight module is driven.
6. the LOCAL DIMMING backlight drive circuits as described in claim 1 to 5 any one, which is characterized in that described
LED driver includes multiple row driving registers and multiple row driving register, and multiple row driving registers are for generating
Timing control signal simultaneously exports, and multiple row driving registers are for generating row driving control signal and exporting.
7. LOCAL DIMMING backlight drive circuits as claimed in claim 6, which is characterized in that the LED driver is also wrapped
Current control register is included, the current control register is for generating current regulation control signal and exporting.
8. a kind of LOCAL DIMMING backlight drive devices, which is characterized in that including as described in claim 1 to 7 any one
LOCAL DIMMING backlight drive circuits.
9. a kind of liquid crystal display, which is characterized in that filled including LOCALDIMMING backlight drives as claimed in claim 8
It sets.
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| CN201810391332.5A CN108597458B (en) | 2018-04-26 | 2018-04-26 | LOCAL DIMMING backlight driving circuit, device and liquid crystal display equipment |
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| CN201810391332.5A CN108597458B (en) | 2018-04-26 | 2018-04-26 | LOCAL DIMMING backlight driving circuit, device and liquid crystal display equipment |
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