CN106683622A - LOCAL DIMMING backlight drive circuit and electronic device - Google Patents
LOCAL DIMMING backlight drive circuit and electronic device Download PDFInfo
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- CN106683622A CN106683622A CN201611271146.5A CN201611271146A CN106683622A CN 106683622 A CN106683622 A CN 106683622A CN 201611271146 A CN201611271146 A CN 201611271146A CN 106683622 A CN106683622 A CN 106683622A
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- power supply
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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
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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
- G09G3/342—Control of illumination source using several illumination sources separately controlled corresponding to different display panel areas, e.g. along one dimension such as lines
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Abstract
The invention discloses a LOCAL DIMMING backlight drive circuit and an electronic device; the LOCAL DIMMING backlight drive circuit comprises a current sink, a drive source, a backlight module including a plurality of LED lights arranged in a matrix form, a plurality of power supply selector switches with output ends in one-to-one corresponding connection with anodes of the multiple LED lights, a plurality of drive switches the input end of each which is connected with cathodes of at least two LED lights and the output end of each which is grounded via the current sink, an LED drive module for driving the drive switches to carry out dimming, and a control module for controlling the LED drive module to operate and controlling on/off of the power supply selector switches. The LOCAL DIMMING backlight drive circuit has the advantages that the number of drive ICs (integrated circuits) is decreased and the production cost is decreased.
Description
Technical field
The present invention relates to backlight drive technical field, more particularly to a kind of LOCAL DIMMING backlight drive circuits and electricity
Sub- equipment.
Background technology
At present, in LOCAL DIMMING actuation techniques, drive IC typically by adjust a driving switch dutycycle come
Correspondence drives a LED lamp, each LED lamp is allowed by constant electric current, so as to change the brightness of each LED lamp.
The driving switch that above-mentioned type of drive is adopted is more, and drives the pin of IC limited, therefore, need using more
IC is driven to drive multiple driving switch simultaneously, complex circuit designs are relatively costly.
The content of the invention
The main object of the present invention is to propose a kind of LOCAL DIMMING backlight drive circuits and electronic equipment, it is intended to solved
Certainly LOCAL DIMMING backlight drive circuits drive multiple driving switch simultaneously using more driving IC in prior art,
Cause complex circuit designs, relatively costly problem.
For achieving the above object, a kind of LOCAL DIMMING backlight drive circuits proposed by the present invention, the LOCAL
DIMMING backlight drive circuits include：
Current sink；
Driving power supply；
Backlight module, the backlight module includes the multiple LEDs in arranged in matrix；
Multiple power supply selecting switch, the input of multiple power supply selecting switch is connected with the driving power supply；It is multiple
The outfan of the power supply selecting switch connects one to one with the anode of multiple LEDs；
Multiple driving switch, the input of each driving switch is connected with the negative electrode of LED described at least two, often
Current sink ground connection described in the outfan Jing of driving switch described in；
And, for driving each driving switch, with dimmed LED drive module, drive for controlling the LED
Dynamic model block work and control it is multiple it is described power supply selecting switch on/off control module.
Preferably, the LED in the backlight module is divided in left-right direction the first equal LED light group of quantity and
Two LED light groups；The quantity of the power supply selecting switch is two, and the respectively first power supply selecting switch and the second power supply selection are opened
Close, the anode of the LED in first LED light group is connected with the described first power supply selecting switch, second LED light group
The anode of interior LED is connected with the described second power supply selecting switch；
First LED light group erects that the horizontally-arranged LED of row, B is corresponding with second LED light group to be located at positioned at A
A erects row, the negative electrode of the LED of the horizontally-arranged positions of B and is connected with the outfan of same driving switch.
Preferably, the LED in the backlight module is divided into along the vertical direction the first equal LED light group of quantity and
Two LED light groups；The quantity of the power supply selecting switch is two, and the respectively first power supply selecting switch and the second power supply selection are opened
Close, the anode of the LED in first LED light group is connected with the described first power supply selecting switch, second LED light group
The anode of interior LED is connected with the described second power supply selecting switch；
First LED light group erects that the horizontally-arranged LED of row, B is corresponding with second LED light group to be located at positioned at A
A erects row, the negative electrode of the LED of the horizontally-arranged positions of B and is connected with the input of the same driving switch.
Preferably, the backlight module is divided into along the vertical direction first LED light group and even number of odd row and ranked second LED
Lamp group；The quantity of the power supply selecting switch is two, and the respectively first power supply selecting switch and the second power supply selecting switch,
The anode of the LED in first LED light group is connected with the described first power supply selecting switch, in second LED light group
LED anode with described second power supply selecting switch be connected；
Each two LED that LED in first LED light group is disposed adjacent with the LED in second LED light group
Lamp is connected with the input of the same driving switch.
Preferably, the backlight module is divided in left-right direction the first LED light group of odd column and the second of even column
LED light group；The quantity of the power supply selecting switch is two, and the respectively first power supply selecting switch and the second power supply selection are opened
Close, the anode of the LED in first LED light group is connected with the described first power supply selecting switch, second LED light group
The anode of interior LED is connected with the described second power supply selecting switch；
Each two LED that LED in first LED light group is disposed adjacent with the LED in second LED light group
Lamp is connected with the input of the same driving switch.
Preferably, the backlight module includes multiple LED units, and each LED unit includes being located at upper left the
One LED, positioned at top-right second LED, positioned at the 3rd LED of lower left and positioned at bottom-right 4th LED；Institute
The quantity for stating power supply selecting switch is four, and the respectively first power supply selecting switch, the second power supply selecting switch, the 3rd power supply
Selecting switch and the 4th power supply selecting switch；The anode of the first LED supplies electric separation with described first in each LED unit
Switch connection is selected, the anode of the second LED is connected with the described second power supply selecting switch in each LED unit, each
The anode of the 3rd LED is connected with the described 3rd power supply selecting switch in the LED unit, the in each LED unit
The anode of four LEDs is connected with the described 4th power supply selecting switch；
The negative electrode of 4 LEDs in the same LED unit is connected with the input of the same driving switch.
Preferably, the outfan correspondence of each power supply selecting switch is interconnected with the anode of LED described in a line；It is each
The negative electrode correspondence for arranging the LED is connected with the input of driving switch described in.
The present invention also proposes a kind of electronic equipment, including and LOCAL DIMMING backlight drive circuits as above, should
Circuit includes：Driving power supply；Backlight module, the backlight module includes the multiple LEDs in arranged in matrix；Multiple power supplies are selected
Switch, the input of multiple power supply selecting switch is connected with the driving power supply；Multiple the defeated of selecting switch of powering
Go out end to connect one to one with the anode of multiple LEDs；Multiple driving switch, the input of each driving switch with
The negative electrode connection of LED described at least two, current sinks A of outfan Jing mono- ground connection of each driving switch；And, it is used for
Drive each driving switch, with dimmed LED drive module, for controlling LED drive module work and controlling
Make the control module of multiple power supply selecting switch on/off.
LOCAL DIMMING backlight drive circuits of the present invention pass through to arrange control module, in control module outside input control
During command signal processed, the command signal is demodulated, and re-start code conversion export into after corresponding control signal to
LED drive module, to control LED drive module output, correspondingly drive signal driving corresponding driving switch, and then is controlled
Adjust the dutycycle of each driving switch to adjust the brightness of each LED, while control module is also receiving the host computer
During the command signal of output, multiple selecting switch on/off of correspondingly powering of control, turned on controlling corresponding LED/
Cut-off.LED drive module in the present invention is by driving multiple driving switch, and each driving switch at least controls two LED
Lamp, thus, the dutycycle for adjusting a driving switch is realized adjusting the brightness of at least two LEDs simultaneously, to reduce LED mould is driven
The driving way of block, LOCAL DIMMING backlight drive circuits of the present invention reduce the quantity for driving IC, reduce and produce into
This.
Description of the drawings
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
The accompanying drawing to be used needed for having technology description is briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Structure according to these accompanying drawings obtains other accompanying drawings.
Fig. 1 is that the functional module that present invention figure LOCAL DIMMING backlight drive circuits are applied in electronic equipment is illustrated
Figure；
Fig. 2 is the structural representation of LOCAL DIMMING backlight drive circuit first embodiments in Fig. 1；
Fig. 3 is the structural representation of LOCAL DIMMING backlight drive circuit second embodiments in Fig. 1；
Fig. 4 is the structural representation of LOCAL DIMMING backlight drive circuit 3rd embodiments in Fig. 1；
Fig. 5 is the structural representation of LOCAL DIMMING backlight drive circuit fourth embodiments in Fig. 1；
Fig. 6 is the structural representation of the embodiment of LOCAL DIMMING backlight drive circuits the 5th in Fig. 1；
Fig. 7 is the structural representation of LOCAL DIMMING backlight drive circuit sixth embodiments in Fig. 1.
The realization of the object of the invention, functional characteristics and advantage will be described further referring to the drawings in conjunction with the embodiments.
Specific embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment a part of embodiment only of the invention, rather than the embodiment of whole.Base
Embodiment in the present invention, those of ordinary skill in the art obtained under the premise of creative work is not made it is all its
His embodiment, belongs to the scope of protection of the invention.
If it is to be appreciated that relate in the embodiment of the present invention directivity indicate (such as up, down, left, right, before and after ...),
Then directionality indicate be only used for explain the relative position relation under a certain particular pose (as shown in drawings) between each part,
Motion conditions etc., if the particular pose changes, directionality indicates also correspondingly to change therewith.
If in addition, relating to the description of " first ", " second " etc. in the embodiment of the present invention, being somebody's turn to do " first ", " second " etc.
Description be only used for describing purpose, and it is not intended that indicating or implying its relative importance or implicit indicate indicated skill
The quantity of art feature.Thus, " first " is defined, at least one spy can be expressed or be implicitly included to the feature of " second "
Levy.In addition, the technical scheme between each embodiment can be combined with each other, but must be with those of ordinary skill in the art's energy
Based on enough realizations, when the combination appearance of technical scheme is conflicting or cannot realize it will be understood that the knot of this technical scheme
Conjunction is not present, also not within the protection domain of application claims.
A kind of LOCAL DIMMING backlight drive circuits proposed by the present invention.
With reference to Fig. 1, in an embodiment of the present invention, the LOCAL DIMMING backlight drive circuits include：Driving power supply
10th, LED drive module 20, control module 30, multiple power supply selecting switch 40, multiple driving switch 50, current sink A and backlight
Module 60.
In the present embodiment, current sink A is used to realize when the LED being attached thereto is turned on, it is ensured that flow through the electric current of LED
It is constant.
Driving power supply 10 is used for when backlight module 60 works, there is provided driving voltage.
Backlight module 60 includes the multiple LEDs in arranged in matrix, and the LED of varying number can constitute different sizes
Backlight module 60, with give the display screen of the multimedia equipments such as television set provide back light.
Control module 30 and LED drive module 20 can be adopted by discrete component composition control circuit or integrated core
Piece is realizing its control function.In the present embodiment, control module 30 is preferably realized using integrated chip MCU, LED drive module
20 preferably drive IC to realize using integrated chip.Specifically, MCU is used for when the command signal of host computer output is received,
The command signal is demodulated, and re-starts code conversion and exported into after corresponding control signal to IC is driven, to control
Drive IC to export corresponding drive signal to drive corresponding driving switch 50, and then control to adjust accounting for for each driving switch 50
It is empty than adjusting the brightness of each LED.MCU is additionally operable to when the command signal of the host computer output is received, and is controlled multiple
Corresponding power supply selecting switch 40 is turned on, to control corresponding LED conduction and cut-off.
The input of multiple power supply selecting switch 40 is connected with driving power supply 10；Multiple power supply selecting switch 40
Outfan connect one to one with the anode of multiple LEDs；Multiple controlled modules 30 of selecting switch 40 of powering
Control, and when the control signal of the output of control module 30 is received, ON/OFF accesses power supply/exit to control LED
Power supply.
The input of each driving switch 50 is connected with the negative electrode of LED described at least two, each driving switch
Current sink A ground connection described in 50 outfan Jing.It is arranged such, at least two LEDs can be caused to be multiplexed a driving switch 50,
Namely LED drive module 20 can be by driving the dutycycle for adjusting a driving switch 50 to adjust at least two LEDs
Brightness, to reduce the driving way of LED drive module 20, so as to reduce the quantity for driving IC.
LOCAL DIMMING backlight drive circuits of the present invention are defeated in the outside of control module 30 by arranging control module 30
During the control instruction signal for entering, the command signal is demodulated, and re-starts code conversion into after corresponding control signal
Export to LED drive module 20, with control LED drive module 20 export correspondingly drive signal driving corresponding driving switch
50, and then the dutycycle of each driving switch 50 is controlled to adjust adjusting the brightness of each LED, while control module 30 is also connecing
When receiving the command signal of the host computer output, control multiple corresponding power supply selecting switch 40 and turn on, it is right to control
The LED conduction and cut-off answered.LED drive module 20 in the present invention is opened by driving multiple driving switch 50, and each driving
Close 50 and at least control two LEDs, thus, adjusting the dutycycle of a driving switch 50 can simultaneously realize regulation at least two
The function of the brightness of LED, reaches the purpose of the driving way for reducing LED drive module 20.The LOCAL DIMMING back ofs the body of the present invention
Light drive circuit reduces the quantity for driving IC, reduces production cost.
With reference to Fig. 2, in a preferred embodiment, the LED in the backlight module 60 is divided in left-right direction quantity
Equal the first LED light group 61 and the second LED light group 62；It is described power supply selecting switch 40 quantity be two, respectively first
Power supply selecting switch KA and the second power supply selecting switch KB, the anode of the LED in first LED light group 61 is with described the
One power supply selecting switch KA connection, the anode of the LED in second LED light group 62 with the described second power supply selecting switch
KB connects；
It is corresponding with second LED light group 62 that first LED light group 61 erects the horizontally-arranged LED of row, B positioned at A
Row are erected positioned at A, the negative electrode of the LED of the horizontally-arranged positions of B is connected with the outfan of same driving switch 50.As shown in Fig. 2
Driving switch 50 is respectively K1 to KN.
In the present embodiment, the LED in backlight module 60 is divided in left-right direction the first equal LED light group 61 of quantity
With the second LED light group 62.It is in 12 horizontally-arranged (B1 ... with backlight module 60 in the present embodiment to better illustrate the present embodiment
B12), illustrate as a example by the matrix form arrangement of 24 perpendicular row (A1 ... A24).Wherein, the first perpendicular row perpendicular are classified as the to the 12nd
The perpendicular row of one LED light group the 61, the 13rd are erected to the 24th and are classified as the second LED light group 62.First LED light group 61 be located at the perpendicular row of A,
B horizontally-arranged LED it is corresponding with the second LED light group 62 positioned at A erect row, the negative electrode of the LED of the horizontally-arranged positions of B with it is same
Individual driving switch 50 outfan connection, namely allow the first LED light group 61 and the second LED light group 62 same position lamp by one
Individual driving switch 50 is controlled.For example, (B1, A1) and (B1, A13) represent same position, by that analogy, (B2, A1) and (B2,
A13), (B1, A2) and (B1, A14) etc. represents the same position of the first LED light group 61 and the second LED light group 62.First LED
LED in lamp group 61 accesses power supply by the first power supply selecting switch KA, and the LED in the second LED light group 62 is led to
Cross the second power supply selecting switch KB to access power supply, a frame signal is divided into upper and lower two half-court signal outputs extremely by control module 30
LED drive module 20.Specifically, when upper half field signal is exported, the control of control module 30 first power supply selecting switch KA is opened,
And then LED conducting (lighting) allowed in the first LED light group 61, LED drive control modules 30 receiving upper half field signal,
I.e. the luminance signal of LED when, adjust the first LED light group 61 on each LED brightness.When lower half field signal is exported, control
Selecting switch KB of powering of the control of module 30 second is opened, and then LED conducting (lighting) allowed in the second LED light group 62, and LED drives
Dynamic control module 30 receiving lower half field signal, namely LED luminance signal when, adjust each LED in the second LED light group 62
The brightness of lamp.
With reference to Fig. 3, in a preferred embodiment, the LED in the backlight module 60 is divided into along the vertical direction quantity
Equal the first LED light group 61 and the second LED light group 62；It is described power supply selecting switch 40 quantity be two, respectively first
Power supply selecting switch KA and the second power supply selecting switch KB, the anode of the LED in first LED light group 61 is with described the
One power supply selecting switch KA connection, the anode of the LED in second LED light group 62 with the described second power supply selecting switch
KB connects；
It is corresponding with second LED light group 62 that first LED light group 61 erects the horizontally-arranged LED of row, B positioned at A
Row, the negative electrode of the LED of the horizontally-arranged positions of B are erected positioned at A to be connected with the input of the same driving switch 50.Such as Fig. 3
Shown, driving switch 50 is respectively K1 to KN.
In the present embodiment, the LED in backlight module 60 is divided into along the vertical direction the first equal LED light group 61 of quantity
With the second LED light group 62.It is in 12 horizontally-arranged (B1 ... with backlight module 60 in the present embodiment to better illustrate the present embodiment
B12), illustrate as a example by the matrix forms arrangement of 24 perpendicular row (A1 ... A24), wherein, first it is horizontally-arranged to the 6th it is horizontally-arranged be first
LED light group 61, seventh rank to the 12nd it is horizontally-arranged be the second LED light group 62.It is horizontal that first LED light group 61 is located at the perpendicular row of A, B
The LED of row is corresponding with the second LED light group 62 to erect row, the negative electrode of the LED of the horizontally-arranged positions of B and same drive positioned at A
The outfan connection of dynamic switch 50, namely allow the first LED light group 61 and the second LED light group 62 same position lamp by a drive
Dynamic switch 50 is controlled.For example, (B1, A1) and (B7, A1) represents same position, by that analogy, (B1, A2) and (B7, A2), (B2,
A1) and (B8, A1), (B2, A2) and (B8, A2) etc. represents the same position of the first LED light group 61 and the second LED light group 62.
LED in first LED light group 61 accesses power supply, the second LED light group by the first power supply selecting switch KA
LED in 62 accesses power supply by the second power supply selecting switch KB, and a frame signal is divided into upper and lower two by control module 30
Individual half-court signal output is to LED drive module 20.Specifically, when upper half field signal is exported, the control of control module 30 first is supplied
Electric selecting switch KA is opened, and then LED conducting (lighting) allowed in the first LED light group 61；LED drive control modules 30 are connecing
Receive upper half field signal, namely LED luminance signal when, adjust the brightness of each LED in the first LED light group 61.Work as output
During lower half field signal, selecting switch KB of powering of the control of control module 30 second is opened, and then the LED allowed in the second LED light group 62
Lamp turns on (lighting), LED drive control modules 30 receiving lower half field signal, namely LED luminance signal when, adjust the
The brightness of each LED in two LED light groups 62.
With reference to Fig. 4, in a preferred embodiment the backlight module 60 is divided into along the vertical direction a LED of odd row
Lamp group 61 and even number ranked second LED light group 62；The quantity of the power supply selecting switch 40 is two, and respectively first supplies electric separation
Power supply selecting switch KB of switch KA and second is selected, the anode of the LED in first LED light group 61 is powered with described first
Selecting switch KA connects, and the anode of the LED in second LED light group 62 connects with the described second power supply selecting switch KB
Connect；
LED in first LED light group 61 be disposed adjacent with the LED in second LED light group 62 per two
Individual LED is connected with the input of the same driving switch 50, as shown in figure 4, driving switch 50 is respectively K1 to KN.
In the present embodiment, backlight module 60 is divided into along the vertical direction first LED light group 61 and even rows of odd row
Two lamp groups of two LED light groups 62.It is horizontally-arranged in 12 with backlight module 60 in the present embodiment in order to better illustrate the present embodiment
(B1 ... B12), illustrates as a example by the matrix forms arrangement of 24 perpendicular row (A1 ... A24), wherein, horizontally-arranged B1, B3, B5, B7, B9,
B11 is the first LED light group 61, and horizontally-arranged B2, B4, B6, B8, B10, B12 are the second LED light group 62.Perpendicular column direction is neighbouring
Two LED lamps controlled by same driving switch 50.Such as (B1, A1) and (B2, A1), (B3, A1) and (B4, A1), (B1,
) and (B2, A2) etc. A2.LED in first LED light group 61 accesses power supply by the first power supply selecting switch KA, and second
LED in LED light group 62 accesses power supply by the second power supply selecting switch KB.Control module 30 is divided into a frame signal
Upper and lower two half-court signal outputs are to LED drive module 20：When upper half field signal is exported, the control of control module 30 first is powered
Selecting switch KA is opened, and then LED conducting (lighting) allowed in the first LED light group 61, and LED drive control modules 30 are being received
To upper half field signal, namely LED luminance signal when, adjust the brightness of each LED in the first LED light group 61.When under output
During half field signal, selecting switch KB of powering of the control of control module 30 second is opened, and then the LED allowed in the second LED light group 62
Conducting (lighting), LED drive control modules 30 receiving lower half field signal, namely LED luminance signal when, adjust second
The brightness of each LED in LED light group 62.
With reference to Fig. 5, in a preferred embodiment, the backlight module 60 is divided in left-right direction the first of odd column
Second LED light group 62 of LED light group 61 and even column；The quantity of the power supply selecting switch 40 is two, and respectively first
Power supply selecting switch KA and the second power supply selecting switch KB, the anode of the LED in first LED light group 61 is with described the
One power supply selecting switch KA connection, the anode of the LED in second LED light group 62 with the described second power supply selecting switch
KB connects；
LED in first LED light group 61 be disposed adjacent with the LED in second LED light group 62 per two
Individual LED is connected with the input of the same driving switch 50.As shown in fig. 7, driving switch 50 is respectively K1 to KN.
In the present embodiment, backlight module 60 is divided in left-right direction the first LED light group 61 of odd column and even column
Two lamp groups of the second LED light group 62.It is horizontal in 12 with backlight module 60 in the present embodiment in order to better illustrate the present embodiment
Row (B1 ... B12), illustrates as a example by the matrix forms arrangement of 24 perpendicular row (A1 ... A24), wherein, erect row A1, A3, A5, A7,
A9, A11...A23 are the first LED light group 61, and it is the second LED light group 62 to erect row A2, A4, A6, A8, A10, A12...A24.By horizontal stroke
Row direction or so two adjacent LED lamps are controlled by same driving switch 50.Such as (B1, A1) and (B1, A2), (B2, A1) and
(B2, A2), (B1, A3) and (B1, A4) etc..LED in first LED light group 61 is connect by the first power supply selecting switch KA
Enter power supply, the LED in the second LED light group 62 accesses power supply by the second power supply selecting switch KB.Control module 30 will
One frame signal is divided into upper and lower two half-court signal outputs to LED drive module 20：When upper half field signal is exported, control module 30
Selecting switch KA of powering of control first is opened, and then LED conducting (lighting) allowed in the first LED light group 61, LED drive controls
Module 30 receiving upper half field signal, namely LED luminance signal when, adjust the bright of each LED in the first LED light group 61
Degree.When lower half field signal is exported, selecting switch KB of powering of the control of control module 30 second is opened, and then allows the second LED light group
LED conducting (lighting) in 62, LED drive control modules 30 are receiving lower half field signal, namely the luminance signal of LED
When, adjust the brightness of each LED in the second LED light group 62.
With reference to Fig. 6, in a preferred embodiment, the backlight module 60 includes multiple LED units (figure is not indicated), each
The LED unit includes being located at upper left first LED, positioned at top-right second LED, positioned at the 3rd of lower left the
LED and positioned at bottom-right 4th LED；The quantity of the power supply selecting switch 40 is four, and the respectively first power supply
Selecting switch KA, the second power supply selecting switch KB, the 3rd power supply selecting switch KC and the 4th power supply selecting switch KD；It is each described
The anode of the first LED is connected with the described first power supply selecting switch KA in LED unit, second in each LED unit
The anode of LED is connected with the described second power supply selecting switch KB, and the anode of the 3rd LED is equal in each LED unit
It is connected with the described 3rd power supply selecting switch KC, the anode of the 4th LED is powered with the described 4th in each LED unit
Selecting switch KD connects；
The negative electrode of 4 LEDs in the same LED unit is connected with the input of the same driving switch 50, such as
Shown in Fig. 6, driving switch 50 is respectively K1 to KN.
In the present embodiment, backlight module 60 is divided into into multiple LED units, each LED unit includes being located at upper left the
One LED, positioned at top-right second LED, positioned at the 3rd LED of lower left and positioned at bottom-right 4th LED,
I.e. each four adjacent LED lamps are a LED unit, in order to better illustrate the present embodiment, in the present embodiment, with backlight module
60 is in 12 horizontally-arranged (B1 ... B12), is illustrated as a example by the matrix form arrangement of 24 perpendicular row (A1 ... A24), wherein, (B1, A1),
(B1, A2), (B2, A1), (B2, A2) constitutes a LED unit, by that analogy (B1, A3), (B1, A4), and (B2, A3), (B2, A4)
Constitute another LED unit, (B3, A1), (B3, A2), (B4, A1), (B4, A2) constitutes another LED unit, each LED unit by
Same driving switch 50 is controlled.Each first LED accesses power supply, each 2nd LED by the first power supply selecting switch KA
Lamp accesses power supply by the second power supply selecting switch KB, and each 3rd LED is connect by the 3rd power supply selecting switch KC
Enter power supply, each 4th LED accesses power supply by the 4th power supply selecting switch KD.Control module 30 is divided into a frame signal
Four subfields are exported to LED drive module 20：When the first sub-field signals are exported, the control of control module 30 first power supply selection is opened
Close KA to open, and then allow all of first LED conducting (lighting), LED drive control modules 30 receiving the first subfield letter
Number, namely LED luminance signal when, adjust the brightness of each first LED.When the second sub-field signals are exported, control module
30 control the second power supply selecting switch KB are opened, and then allow all of second LED to turn on (lighting), LED drive control modules
30 receiving the second sub-field signals, namely LED luminance signal when, adjust the brightness of each second LED.When output the 3rd
During sub-field signals, power supply selecting switch KC of the control of control module 30 the 3rd is opened, and then allows all of 3rd LED to turn on (point
It is bright), LED drive control modules 30 receiving the 3rd sub-field signals, namely LED luminance signal when, adjust each 3rd LED
The brightness of lamp.When four sub-field signals are exported, power supply selecting switch KD of the control of control module 30 the 4th is opened, and then allows all
The 4th LED conducting (lighting), LED drive control modules 30 are receiving the 4th sub-field signals, namely the brightness letter of LED
Number when, adjust the brightness of each 4th LED.
With reference to Fig. 7, in a preferred embodiment, described in the outfan correspondence and a line of each power supply selecting switch 40
The anode interconnection of LED；The negative electrode correspondence of LED described in per string is connected with the input of driving switch described in one 50.
In the present embodiment, in order to better illustrate the present embodiment, so that electric selecting switch 40 is respectively KA to KL, driving is opened
Close 50 and be respectively K1 to K24, backlight module 60 is in 12 horizontally-arranged (B1 ... B12), and the matrix form of 24 perpendicular row (A1 ... A24) is arranged as
Example is illustrated.Backlight module 60 includes the multiple LEDs in arranged in matrix, and each to drive by way of matrix majorization
LED.Specifically, every a line namely each horizontally-arranged LED access power supply by a power supply selecting switch 40, per string
Namely the LED of each perpendicular row is controlled by a driving switch 50.Control module 30 divides a frame signal according to horizontally-arranged quantity
Into with horizontally-arranged quantity identical subfield.It is horizontally-arranged if any 12, just it is divided into 12 subfields：When the first sub-field signals are exported, control module
30 control the first power supply selecting switch KA are opened, and then allow all of first horizontally-arranged LED conducting (lighting), LED to drive control
Molding block 30 receiving the first sub-field signals, namely LED luminance signal when, adjust first it is horizontally-arranged on be attached thereto
The brightness of LED, by that analogy, until all horizontally-arranged LEDs are lighted once, repeats said process.
It is understood that in the various embodiments described above, the quantity of the LED in backlight module 60 is not limited.It is above-mentioned each
The LED quantity that embodiment is enumerated is only used for more easily illustrating present inventive concept.
The present invention also proposes a kind of electronic equipment, and the electronic equipment includes LOCAL DIMMING backlight drive circuits, should
Concrete structure reference above-described embodiment of LOCAL DIMMING backlight drive circuits, because this electronic equipment employs above-mentioned institute
There are whole technical schemes of embodiment, therefore all beneficial effects that at least technical scheme with above-described embodiment is brought,
This is no longer going to repeat them.
The preferred embodiments of the present invention are the foregoing is only, the scope of the claims of the present invention is not thereby limited, it is every at this
Under the inventive concept of invention, the equivalent structure transformation made using description of the invention and accompanying drawing content, or directly/use indirectly
It is included in the scope of patent protection of the present invention in other related technical fields.
Claims (8)
1. a kind of LOCAL DIMMING backlight drive circuits, it is characterised in that include
Current sink；
Driving power supply；
Backlight module, the backlight module includes the multiple LEDs in arranged in matrix；
Multiple power supply selecting switch, the input of multiple power supply selecting switch is connected with the driving power supply；It is multiple described
The outfan of power supply selecting switch connects one to one with the anode of multiple LEDs；
Multiple driving switch, the input of each driving switch is connected with the negative electrode of LED described at least two, Mei Yisuo
State current sink ground connection described in the outfan Jing of driving switch；
And, for driving each driving switch, with dimmed LED drive module, for controlling the LED drive mould
Block work and control it is multiple it is described power supply selecting switch on/off control module.
2. LOCAL DIMMING backlight drive circuits as claimed in claim 1, it is characterised in that in the backlight module
LED is divided in left-right direction the first equal LED light group of quantity and the second LED light group；The number of the power supply selecting switch
Measure as two, the respectively first power supply selecting switch and the second power supply selecting switch, the LED in first LED light group
Anode is connected with the described first power supply selecting switch, and the anode of the LED in second LED light group is supplied with described second
Electric selecting switch connection；
It is corresponding with second LED light group perpendicular positioned at A that first LED light group erects the horizontally-arranged LED of row, B positioned at A
Row, the negative electrode of the LED of the horizontally-arranged positions of B are connected with the outfan of same driving switch.
3. LOCAL DIMMING backlight drive circuits as claimed in claim 1, it is characterised in that in the backlight module
LED is divided into along the vertical direction the first equal LED light group of quantity and the second LED light group；The number of the power supply selecting switch
Measure as two, the respectively first power supply selecting switch and the second power supply selecting switch, the LED in first LED light group
Anode is connected with the described first power supply selecting switch, and the anode of the LED in second LED light group is supplied with described second
Electric selecting switch connection；
It is corresponding with second LED light group perpendicular positioned at A that first LED light group erects the horizontally-arranged LED of row, B positioned at A
Row, the negative electrode of the LED of the horizontally-arranged positions of B are connected with the input of the same driving switch.
4. LOCAL DIMMING backlight drive circuits as claimed in claim 1, it is characterised in that the backlight module is along upper
Lower direction is divided into first LED light group and even number of odd row and ranked second LED light group；The quantity of the power supply selecting switch is two
It is individual, and the respectively first power supply selecting switch and the second power supply selecting switch, the anode of the LED in first LED light group
It is connected with the described first power supply selecting switch, the anode of the LED in second LED light group supplies electric separation with described second
Select switch connection；
Each two LED that LED in first LED light group is disposed adjacent with the LED in second LED light group with
The input connection of the same driving switch.
5. LOCAL DIMMING backlight drive circuits as claimed in claim 1, it is characterised in that the backlight module is along left
Right direction is divided into the first LED light group of odd column and the second LED light group of even column；It is described power supply selecting switch quantity be
Two, and the respectively first power supply selecting switch and the second power supply selecting switch, the sun of the LED in first LED light group
Extremely it is connected with the described first power supply selecting switch, the anode of the LED in second LED light group is powered with described second
Selecting switch connects；
Each two LED that LED in first LED light group is disposed adjacent with the LED in second LED light group with
The input connection of the same driving switch.
6. LOCAL DIMMING backlight drive circuits as claimed in claim 1, it is characterised in that the backlight module includes
Multiple LED units, each LED unit includes being located at upper left first LED, positioned at top-right second LED, position
In the 3rd LED of lower left and positioned at bottom-right 4th LED；The quantity of the power supply selecting switch is four, and point
Wei not the first power supply selecting switch, the second power supply selecting switch, the 3rd power supply selecting switch and the 4th power supply selecting switch；It is each
The anode of the first LED is connected with the described first power supply selecting switch in the LED unit, the in each LED unit
The anode of two LEDs is connected with the described second power supply selecting switch, and the anode of the 3rd LED is equal in each LED unit
It is connected with the described 3rd power supply selecting switch, the anode of the 4th LED supplies electric separation with the described 4th in each LED unit
Select switch connection；
The negative electrode of 4 LEDs in the same LED unit is connected with the input of the same driving switch.
7. LOCAL DIMMING backlight drive circuits as claimed in claim 1, it is characterised in that each power supply is selected
The outfan correspondence of switch is interconnected with the anode of LED described in a line；The negative electrode correspondence of LED described in per string is driven with described in one
The input connection of dynamic switch.
8. a kind of electronic equipment, it is characterised in that include the LOCAL DIMMING backlights as described in claim 1 to 7 any one
Drive circuit.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611271146.5A CN106683622B (en) | 2016-12-31 | 2016-12-31 | LOCAL DIMMING backlight drive circuit and electronic equipment |
| PCT/CN2017/111895 WO2018121126A1 (en) | 2016-12-31 | 2017-11-20 | Local dimming backlight driver circuit and electronic device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611271146.5A CN106683622B (en) | 2016-12-31 | 2016-12-31 | LOCAL DIMMING backlight drive circuit and electronic equipment |
Publications (2)
| Publication Number | Publication Date |
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| CN106683622A true CN106683622A (en) | 2017-05-17 |
| CN106683622B CN106683622B (en) | 2019-12-03 |
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|---|---|---|---|
| CN201611271146.5A Active CN106683622B (en) | 2016-12-31 | 2016-12-31 | LOCAL DIMMING backlight drive circuit and electronic equipment |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN106683622B (en) |
| WO (1) | WO2018121126A1 (en) |
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| WO2018121126A1 (en) * | 2016-12-31 | 2018-07-05 | 深圳Tcl数字技术有限公司 | Local dimming backlight driver circuit and electronic device |
| CN108597458A (en) * | 2018-04-26 | 2018-09-28 | 深圳Tcl新技术有限公司 | LOCAL DIMMING backlight drive circuits, Apparatus and liquid crystal display equipment |
| CN109192146A (en) * | 2018-10-12 | 2019-01-11 | 京东方科技集团股份有限公司 | A kind of backlight module and display device |
| CN110021276A (en) * | 2019-05-10 | 2019-07-16 | 合肥惠科金扬科技有限公司 | A kind of backlight drive circuit and backlight drive device |
| CN111627381A (en) * | 2020-06-30 | 2020-09-04 | 上海天马微电子有限公司 | Light-emitting panel and display device |
| CN113689782A (en) * | 2021-08-19 | 2021-11-23 | 武汉华星光电技术有限公司 | Backlight module and display device |
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| CN113689782A (en) * | 2021-08-19 | 2021-11-23 | 武汉华星光电技术有限公司 | Backlight module and display device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106683622B (en) | 2019-12-03 |
| WO2018121126A1 (en) | 2018-07-05 |
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