CN104091570B - Backlight circuit and driving method, backlight module, display device - Google Patents
Backlight circuit and driving method, backlight module, display device Download PDFInfo
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- CN104091570B CN104091570B CN201410280997.0A CN201410280997A CN104091570B CN 104091570 B CN104091570 B CN 104091570B CN 201410280997 A CN201410280997 A CN 201410280997A CN 104091570 B CN104091570 B CN 104091570B
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Abstract
The present invention provides a kind of backlight circuit and driving method, backlight module, display device, belongs to backlight Display Technique field, and it can solve the LED in existing backlight circuit due to the temperature higher problem causing its service life reduction during work.The backlight circuit of the present invention, including: LED group, controller unit, LED drive unit, temperature sensing unit and luminance compensation unit；Described LED drive unit is for exporting constant current to drive described LED group luminous under the control of described controller unit, described temperature sensing unit generates and the described corresponding temperature signal of LED group for the temperature according to described LED group, and is connected with described controller unit；Described controller unit, for according to described temperature signal, controls the size of described LED drive unit output current value, to regulate the temperature of LED group；Described luminance compensation unit, under the control of described controller unit, compensates with the brightness to described LED group according to described temperature signal.
Description
Technical field
The invention belongs to backlight Display Technique field, be specifically related to a kind of backlight circuit and
Driving method, backlight module, display device.
Background technology
At present, light emitting diodde desplay device (Light Emitting Diode；LED) make
For forth generation light source, because of great development prospects of advantage such as its energy-saving and environmental protection, life-span length.
It is known that the luminous efficiency of LED is higher and energy consumption is less, by extensively
Use in all kinds of places.LED is the most sensitive to temperature, and temperature rising can affect LED
The life-span of lamp, light efficiency, colour temperature and forward voltage, maximum injection current, luminosity,
Colourity, electric parameter and reliability etc..When LED group provides light source for LCD module,
Along with the rising of LED temperature, identical driving electric current can cause LCD display brightness and
Colourity changes, thus affects reliability and the service life of LED.
Inventor finds that in prior art, at least there are the following problems: specifically by LED
When the LED group of lamp composition is applied in the backlight module of display device, along with LED
The rising of the temperature of lamp group, identical driving electric current can cause the bright of the display of display device
Degree and colourity change, thus cause showing bad.
Summary of the invention
The technical problem to be solved includes, exists for existing backlight circuit
The problems referred to above, it is provided that a kind of service life length, the backlight circuit of better performances and driving
Dynamic method, display device.
Solve the technology of the present invention problem and be employed technical scheme comprise that a kind of backlight circuit, bag
Include: LED group, controller unit, LED drive unit, temperature sensing unit and bright
Degree compensating unit；
Described LED drive unit is constant for exporting under the control of described controller unit
Electric current is luminous with the described LED group of driving,
Described temperature sensing unit generates with described for the temperature according to described LED group
The corresponding temperature signal of LED group, and be connected with described controller unit；
Described controller unit, for according to described temperature signal, controls described LED and drives
The size of unit output current value, to regulate the temperature of LED group；
Described luminance compensation unit is under the control of described controller unit, according to institute
State temperature signal to compensate with the brightness to described LED group.
Owing to the backlight circuit of the present invention includes temperature sensing unit and luminance compensation unit,
So when LED group works, temperature sensing unit induction LED lamp group can be passed through
Temperature signal, controller unit judges the temperature of LED group according to this temperature signal information
Degree situation, thus regulate LED by the current value of regulation LED drive unit output
The temperature of lamp group, the LED group that luminance compensation unit judges according to controller unit simultaneously
Temperature conditions be adjusted with the brightness to LED group, specifically, work as LED
When the temperature of lamp group is normal, luminance compensation unit does not works, and LED drive unit is just exporting
Often drive the current value that LED group is luminous；When LED group temperature anomaly namely
When temperature is higher than normal temperature, LED drive unit then exports less than a upper moment LED
The current value of group work, to reduce the work efficiency of LED group, i.e. reduces LED
The luminosity of group and temperature, simultaneously luminance compensation unit work, by luminance compensation list
Unit's work carrys out the luminance loss of compensation LED lamp group.The backlight circuit of the present embodiment solves
Existing backlight circuit causes the problem of LED group service life reduction owing to temperature is higher, with
Time add luminance compensation unit to compensate in prior art by reduce electric current and cause
The luminance loss of LED group.So the backlight circuit of the present invention has stronger practicality.
Preferably, described backlight circuit also includes: AD conversion unit, comparator list
Unit,
Described AD conversion unit is connected with described temperature sensing unit, for by described temperature
The temperature signal of degree sensing unit output is converted into digital voltage signal output；
The normal phase input end of described comparator receives the voltage of described AD conversion unit output
Signal, anti-phase input termination reference voltage, output termination controller unit, for by institute
State voltage signal to compare with described reference voltage, and according to comparative result output level
Signal gives described controller unit.
Preferably, described LED group includes the LED string of multiple parallel connection, described
Luminance compensation unit includes multiple luminance adjustment module；
The input of each described LED string links together, and drives with described LED
The positive pole of moving cell output connects, bright described in the output termination one of each described LED string
The input of degree adjustment module, the output termination of each described luminance adjustment module is described
The negative pole of LED drive unit output.
It may further be preferable that described luminance adjustment module includes: compensation LED lamp string,
First switching tube, second switch pipe；
The input of described compensation LED lamp string is connected with the outfan of described LED string
Connect with the drain electrode of described first switching tube, the outfan of described compensation LED lamp string and the
The drain electrode of two switching tubes connects；
The grid of described first switching tube is connected with the grid of second switch pipe, and passes through institute
State controller unit control；
The source electrode of described first switching tube is connected with the source electrode of second switch pipe, and with described
The negative pole of LED drive unit output connects；Wherein,
Described first switching tube is p-type pipe, and described second switch pipe is N-type pipe.
It is even furthermore preferable that each described LED string includes the LED of N number of series connection
Lamp, N is the integer more than 1；Each described compensation LED lamp string includes that M is connected
Compensation LED lamp, M is more than or equal to 1 integer；Wherein,
The positive pole of the 1st LED of each described LED string be connected with each other and with institute
State and drive the positive pole of output current source to connect, n-th LED of each described LED string
The negative pole of lamp connects the 1st compensation of corresponding described compensation LED lamp string respectively
The positive pole of LED and the drain electrode of described first switching tube, each described compensation LED lamp string
The negative pole of m-th LED connect the drain electrode of corresponding described second switch pipe.
Solve the technology of the present invention problem and be employed technical scheme comprise that driving of a kind of backlight circuit
Dynamic method, described backlight circuit includes: LED group, controller unit, LED drive
Unit, temperature sensing unit, luminance compensation unit, described LED drive unit is used for
Under the control of described controller unit, output driving current is to drive described LED group to send out
Light, described temperature sensing unit and described luminance compensation unit all with described controller unit
Connecting, the driving method of described backlight drive circuit comprises the steps:
By described temperature sensing unit, the temperature of described LED group is generated with described
The corresponding temperature signal of LED group, and pass to described controller unit and process；
Described controller unit, according to described temperature signal, controls described LED drive unit
The size of output current value, to regulate the temperature of LED group, controls described brightness simultaneously
The brightness of described LED group is compensated by compensating unit.
Preferably, described backlight circuit also includes: AD conversion unit, comparator list
Unit, described analog-digital converter unit is connected with described temperature sensing unit, described comparator
Normal phase input end be connected with described AD conversion unit, anti-phase input termination reference voltage,
Output termination controller unit,
Described by described temperature sensing unit, the temperature of described LED group is generated and institute
State the corresponding temperature signal of LED group, and pass to described controller unit and process
Specifically include:
By described temperature sensing unit, the temperature of described LED group is generated with described
The corresponding temperature signal of LED group；
By described AD conversion unit, the described temperature signal of analog quantity is converted into numeral
The voltage signal of amount；
Big by the more described voltage signal of described comparator unit and described reference voltage
Little, if voltage signal exports high level more than reference voltage, described comparator unit, if
Voltage signal is less than reference voltage, described comparator unit output low level；
Described controller unit is according to bright described in the output output control of described comparator unit
The brightness of LED group is adjusted by degree compensating unit.
It may further be preferable that when described comparator unit exports high level, described control
Device unit is according to luminance compensation unit pair described in the output output control of described comparator unit
The brightness of LED group also includes after being adjusted:
The temperature being sensed described LED group by described temperature sensing unit is reduced, described
Controller unit output low level, and driven by the described controller unit described LED of control
The current value of moving cell output.
It may further be preferable that described LED group includes the LED string of multiple parallel connection,
Described luminance compensation unit includes multiple luminance adjustment module, described controller unit according to
The output output control luminance compensation unit brightness to LED group of described comparator unit
It is adjusted, specifically includes:
Described controller unit according to the output output control of described comparator unit each
Described luminance adjustment module is with to the described LED corresponding to luminance adjustment module this described
The brightness of string is adjusted, to regulate the brightness of this LED string.
It is even furthermore preferable that described luminance adjustment module includes: compensation LED lamp string,
First switching tube, second switch pipe；Wherein, described first switching tube is p-type pipe, institute
Stating second switch pipe is N-type pipe, and described controller unit is according to described comparator unit
Output each described luminance adjustment module of output control is with to luminance adjustment module this described
The brightness of corresponding described LED string is adjusted specifically including:
Described controller unit is opened according to the output output control first of described comparator unit
Close pipe and second switch pipe is switched on or off, to control described compensation LED lamp string to LED
The regulation of lamp group brightness.
Solve the technology of the present invention problem and be employed technical scheme comprise that a kind of backlight module, its
Including above-mentioned backlight circuit.
Solve the technology of the present invention problem and be employed technical scheme comprise that a kind of display device, its
Including above-mentioned backlight module.
Accompanying drawing explanation
Fig. 1 is a kind of schematic diagram of embodiments of the invention 1 and 2 backlight circuit；
Fig. 2 is the another kind of schematic diagram of the backlight circuit of embodiments of the invention 1 and 2；
Fig. 3 is a kind of concrete structure of the backlight circuit of embodiments of the invention 1 and 2
Schematic diagram；
Wherein reference is: 1, controller unit；2, LED group；3, brightness is mended
Repay module；4, LED drive unit；5, temperature sensing unit；6, AD conversion unit；
7, comparator unit.
Detailed description of the invention
For making those skilled in the art be more fully understood that technical scheme, knot below
Close the drawings and specific embodiments the present invention is described in further detail.
Embodiment 1:
Shown in Fig. 1, the present embodiment provides a kind of backlight circuit, comprising: LED
Lamp group 2, controller unit 1, LED drive unit 4, temperature sensing unit 5, brightness
Compensating unit 3；Wherein, described LED drive unit 4 is at described controller unit
Under the control of 1, output driving current is to drive described LED group 2 luminous；Described temperature
Sensing unit 5 generates and described LED for the temperature according to described LED group 2
Group 2 corresponding temperature signals, and with described controller unit；Described controller unit 1
For according to described temperature signal, controlling described LED drive unit 4 output current value
Size, to regulate the temperature of LED group 2；Described luminance compensation unit 3 is in institute
State under the control of controller unit, according to described temperature signal with to described LED group 2
Temperature be adjusted.
It should be noted that the LED drive unit 4 in the present embodiment can be LED
Lamp group 2 inputs constant current value, and the size of this current value is by control unit 1
Control, determine brightness and the temperature of LED group 2 simultaneously, and current value is the biggest
The brightness of LED group 2 is the highest and temperature is the highest, it is of course possible to be understood by brightness
Big value is certain, and the darkest temperature of brightness of current value the least LED group 2 is relatively low.
Owing to the backlight circuit of the present embodiment includes temperature sensing unit 5 and luminance compensation list
Unit 3, so when LED group 2 works, can sense by temperature sensing unit 5
The temperature signal of LED group 2, controller unit 1 judges according to this temperature signal information
The temperature conditions of LED group 2, thus by the electricity of regulation LED drive unit 4 output
Flow valuve regulates the temperature of LED group 2, and luminance compensation unit 3 is according to controller simultaneously
The temperature conditions of the LED group 2 that unit 1 judges is entered with the brightness to LED group 2
Row regulation, specifically, when the temperature of LED group 2 is normal, luminance compensation unit
3 do not work, and LED drive unit 4 exports the electric current of driven LED group 2 luminescence
Value；When the temperature anomaly of LED group 2 i.e. temperature are higher than normal temperature, LED
Driver element 4 then exports the current value less than upper moment LED group 2 job, with fall
The work efficiency of low LED, i.e. reduces luminosity and the temperature of LED group 2, with
Time luminance compensation unit 3 work, by luminance compensation unit 3 work come compensation LED lamp
The luminance loss of group 2.The backlight circuit of the present embodiment solve existing backlight circuit by
In the higher problem causing LED group 2 service life reduction of temperature, add brightness simultaneously and mend
Repay unit 3 and cause the bright of LED group 2 to compensate in prior art by reducing electric current
Degree loss.The backlight circuit of the present embodiment has stronger practicality thus.
As shown in Figure 2, it is preferable that the backlight circuit of the present embodiment also includes: modulus turns
Change unit 6, comparator unit 7, analog-digital converter unit 6 and described temperature sensing unit
5 connect, corresponding to described LED group 2 for being generated by described temperature sensing unit 5
Temperature signal be converted into the voltage signal of digital quantity；The normal phase input end of comparator and institute
Stating AD conversion unit 6 to connect, anti-phase input termination reference voltage, output termination controls
Device unit 1, is used for controlling luminance compensation unit 3.Specifically, when comparator unit 7
The voltage signal of normal phase input end input is less than the reference voltage of its inverting input input
Time, the outfan output low level of comparator unit 7, LED group 2 is now described
Temperature is normal temperature, and now LED drive unit 4 keeps former output electric current, and brightness is mended
Repay unit 3 not work；When the voltage signal of comparator unit 7 normal phase input end input is big
When the reference voltage that its inverting input inputs, the outfan output of comparator unit 7
High level, now the temperature of explanation LED group 2 is higher than normal temperature, now by control
Device unit 1 processed reduces the current value of LED drive unit 4 output, namely reduces LED
The temperature of lamp group 2, controls luminance compensation unit 3 simultaneously and works luminous with to LED group
The luminance loss that the current reduction of 2 causes compensates, when LED group 2 over time
Change when being reduced to normal temperature, namely when the temperature that temperature sensing unit 5 senses
The voltage signal that degree signal is changed by AD conversion unit 6 is defeated less than controller unit 1
During the reference voltage entered, controller unit 1 controls LED drive unit 4 and exports primary current
Value (current value when namely LED group 2 is started working).
Shown in concrete combination Fig. 3, the most described LED group 2 includes many
The LED string of individual parallel connection, described luminance compensation unit 3 includes multiple luminance adjustment module；
The input of each described LED string links together, and drives single with described LED
The positive pole LEDA of unit's output connects, described in the output termination one of each described LED string
The input of luminance adjustment module, the output termination of each described luminance adjustment module is described
The negative pole LEDK of LED drive unit output.Now set on each LED string
Put a luminance adjustment module, so that bright on the backlight circuit after whole luminance compensation
Spend more uniform.
It is further preferred that described luminance adjustment module includes: compensation LED lamp string,
One switching tube, second switch pipe；The input of described compensation LED lamp string and described LED
The outfan of lamp string connects and the drain electrode of described first switching tube connects, outfan and second
The drain electrode of switching tube connects；The grid of described first switching tube and the grid of second switch pipe
It is connected, and is controlled by described controller unit 1；The source electrode of described first switching tube and
The source electrode of second switch pipe is connected, and the negative pole exported with described LED drive unit
LEDK connects；Wherein, described first switching tube is p-type pipe, described second switch pipe
For N-type pipe.Specifically, when controller unit 1 output low level, namely LED
When lamp group 2 temperature is normal, the first switching tube is opened, and second switch pipe turns off, and now mends
Repay LED string the most luminous；When controller unit 1 exports high level, namely LED
When lamp group 2 temperature is higher than normal temperature, LED drive unit 4 reduces the electric current of its input
Value, the first switching tube turns off simultaneously, and second switch pipe is opened, now compensation LED lamp string
Luminescence compensates with the luminance loss to LED group 2.
It is further preferred that each described LED string includes the LED of N number of series connection
Lamp DN, N is the integer more than 1；Each described compensation LED lamp string includes M string
The compensation LED lamp D ' of connectionM, M is the integer more than or equal to 1；Wherein, each described
The positive pole of the 1st compensation LED lamp of LED string is connected with each other and drives output with described
The positive pole of current source connects, the negative pole of the n-th LED of each described LED string
Just connect the 1st LED D ' the 1st of corresponding described compensation LED lamp string respectively
Pole and the drain electrode of described first switching tube, the m-th of each described compensation LED lamp string
The negative pole of LED connects the drain electrode of corresponding described second switch pipe.Such as say every
Individual LED string includes that 4 LED connected, each compensation LED lamp string include one
Individual compensation LED lamp.
Embodiment 2:
In conjunction with Fig. 1 to the backlight circuit shown in 3, the present embodiment provides a kind of backlight circuit
Driving method, this backlight circuit can be the backlight circuit described in embodiment 1, institute
State driving method specifically to may include that
By described temperature sensing unit 5, the temperature of described LED group 2 is generated and institute
State the corresponding temperature signal of LED group 2, and pass at described controller unit
Reason；
Wherein, described backlight circuit also includes: AD conversion unit 6, comparator unit 7,
Described analog-digital converter unit 6 is connected with described temperature sensing unit 5, described comparator
Normal phase input end be connected with described AD conversion unit 6, anti-phase input termination benchmark electricity
Pressure, output termination controller unit 1, above-mentioned steps specifically may include that
By described temperature sensing unit 5, the temperature of described LED group 2 is generated and institute
State the corresponding temperature signal of LED group 2；
By described AD conversion unit 6, the described temperature signal of analog quantity is converted into number
The voltage signal of word amount；
By described comparator unit 7 relatively described voltage signal and described reference voltage
Size, if voltage signal is more than reference voltage, described comparator unit 7 exports high level,
If voltage signal is less than reference voltage, described comparator unit 7 output low level；
Described controller unit 1 is according to the output output control institute of described comparator unit 7
State luminance compensation unit 3 brightness of LED group 2 is adjusted.
Described controller unit 1, according to described temperature signal, controls described LED and drives single
The size of unit's 4 output current values, to regulate the temperature of LED group 2, controls institute simultaneously
State luminance compensation unit 3 brightness of described LED group 2 is compensated.
In above-mentioned steps, when described comparator unit 7 exports high level, described control
Device unit 1 is according to luminance compensation list described in the output output control of described comparator unit 7
Unit 3 also includes after being adjusted the brightness of LED group 2:
The temperature being sensed described LED group 2 by described temperature sensing unit 5 is reduced,
Described controller unit 1 output low level, and control institute by described controller unit 1
State the current value of LED drive unit 4 output, now LED drive unit 4 output
Current value is primary current value.
Wherein, described LED group 2 includes the LED string of multiple parallel connection, described bright
Degree compensating unit 3 includes multiple luminance adjustment module, at controller described in above-mentioned steps
Unit 1 is right according to the output output control luminance compensation unit 3 of described comparator unit 7
The brightness of LED group 2 is adjusted, and specifically includes:
Described controller unit 1 is every according to the output output control of described comparator unit 7
One described luminance adjustment module is with to described in corresponding to luminance adjustment module this described
The brightness of LED string is adjusted, to regulate the brightness of this LED string.
It is further preferred that described luminance adjustment module includes: compensation LED lamp string,
First switching tube, second switch pipe；Wherein, described first switching tube is p-type pipe, institute
Stating second switch pipe is N-type pipe, and described controller unit 1 is according to described comparator unit
Each described luminance adjustment module of the output output control of 7 is with to brightness regulation this described
The brightness of the described LED string corresponding to module is adjusted specifically including:
Described controller unit 1 is according to the output output control of described comparator unit 7
One switching tube and second switch pipe are switched on or off, to control described compensation LED lamp string pair
The regulation of LED group 2 brightness.
In order to be better understood from the driving method of the present embodiment, include 4 with LED group 2
Individual LED string, each LED string includes 4 LED (D1, D2, D3, D4),
4 compensation LED lamp strings, each compensation side optical module includes 1 compensation LED lamp (D
' 1), illustrate as a example by the second switch pipe of p-type the first switching tube, N-type.
As it is shown in figure 1,4 LED series connection of each LED string, first LED
The positive pole of lamp meets the positive pole LEDA of LED drive unit 4 output, the 4th LED
Negative pole is connected with the positive pole of compensation LED lamp, is connected with the drain electrode of the first switching tube simultaneously,
The negative pole of compensation LED lamp is connected with the drain electrode of second switch pipe, the first switching tube and second
The grid of switching tube is connected and receives on controller unit 1, and the first switching tube and second is opened
The source electrode closing pipe is connected and receives the negative pole LEDK (K of LED drive unit 4 output
Integer for more than or equal to 1).
As in figure 2 it is shown, this backlight circuit also temperature sensing unit 5, AD conversion unit 6,
Comparator unit 7 and controller unit 1.Temperature sensing unit 5 temperature sensor signal, and
The corresponding voltage signal that this temperature signal is exported by AD conversion unit 6 with compare
The reference voltage V of device unit 7 inputrefRelatively, if less than reference voltage value, comparator
Unit 7 output low level, illustrates that LED group 2 temperature is normal, now controller unit
1 output low level is opened to LED group 2, the first switching tube, and second switch pipe is closed,
Compensation LED lamp does not works, and LED drive unit 4 normally exports electric current；If more than benchmark electricity
Pressure value, comparator unit 7 exports high level, illustrates that the operating temperature of LED group 2 is inclined
Height, controller unit 1 controls to reduce the current value of LED drive unit 4 output, simultaneously
Controller unit 1 exports high level signal and beats to luminance compensation unit 3, second switch pipe
Opening, the first switching tube is closed so that compensation LED lamp is luminous, to compensate due to current reduction
And the luminance loss of the LED group 2 caused, extend LED life simultaneously.Work as LED
The temperature of lamp group 2 is reduced to temperature sensing unit 5 and the electricity of AD conversion unit 6 output
When pressure signal is less than reference voltage value, controller unit 1 output low level again is to brightness
Compensating unit 3, LED drive unit 4 normally exports primary current value simultaneously.
Embodiment 3:
The present embodiment provides a kind of backlight module, and it includes the backlight circuit in embodiment 1,
This backlight module can be straight-down negative be also for side entering type, this backlight module also includes diffusion
The known device such as plate, optical film, describes in detail the most one by one at this.
Owing to the backlight module of the present embodiment includes the backlight circuit of embodiment 1, Gu Qishou
Ordering longer, practicality is stronger.
Embodiment 4:
Present embodiments providing a kind of display device, it includes the backlight mould in embodiment 3
Group, it also includes array base palte, color membrane substrates etc. known structure.
Owing to the display device of the present embodiment includes the backlight module of embodiment 3, therefore its matter
Measuring higher, display effect is more preferable.
Display device in the present embodiment is it may also is that liquid crystal panel, Electronic Paper, liquid crystal
TV, liquid crystal display, DPF, mobile phone, panel computer etc. are any has display
The product of function or parts.
The display device of the present embodiment include array base palte described in embodiment 1, therefore its
Display quality is higher.
It is understood that the principle that embodiment of above is intended to be merely illustrative of the present
And the illustrative embodiments used, but the invention is not limited in this.For ability
For those of ordinary skill in territory, in the situation without departing from spirit and substance of the present invention
Under, various modification and improvement can be made, these modification and improvement are also considered as the present invention's
Protection domain.
Claims (10)
1. a backlight circuit, including: LED group, controller unit, LED drive
Unit, described LED drive unit is for output perseverance under the control of described controller unit
Determine electric current to drive described LED group luminous, it is characterised in that described backlight circuit is also
Including temperature sensing unit and luminance compensation unit；
Described temperature sensing unit generates with described for the temperature according to described LED group
The corresponding temperature signal of LED group, and be connected with described controller unit；
Described controller unit, for according to described temperature signal, controls described LED and drives
The size of unit output current value, to regulate the temperature of LED group；
Described luminance compensation unit is under the control of described controller unit, according to institute
State temperature signal to compensate with the brightness to described LED group；
Described LED group includes the LED string of multiple parallel connection, described luminance compensation list
Unit includes multiple luminance adjustment module；The input of each described LED string is connected to one
Rise, and the positive pole exported with described LED drive unit is connected, each described LED
The input of luminance adjustment module, each described brightness regulation described in the output termination one of string
The output of module terminates the negative pole of described LED drive unit output.
Backlight circuit the most according to claim 1, it is characterised in that described backlight
Circuit also includes: AD conversion unit, comparator unit,
Described AD conversion unit is connected with described temperature sensing unit, for by described temperature
The temperature signal of degree sensing unit output is converted into digital voltage signal output；
The normal phase input end of described comparator receives the voltage of described AD conversion unit output
Signal, anti-phase input termination reference voltage, output termination controller unit, for by institute
State voltage signal to compare with described reference voltage, and according to comparative result output level
Signal gives described controller unit.
Backlight circuit the most according to claim 1, it is characterised in that described brightness
Adjustment module includes: compensation LED lamp string, the first switching tube, second switch pipe；
The outfan of the input of described compensation LED lamp string and described LED string and institute
The drain electrode stating the first switching tube connects, and the outfan of described compensation LED lamp string and second leaves
The drain electrode closing pipe connects；
The grid of described first switching tube is connected with the grid of second switch pipe, and passes through institute
State controller unit control；
The source electrode of described first switching tube is connected with the source electrode of second switch pipe, and with described
The negative pole of LED drive unit output connects；Wherein,
Described first switching tube is p-type pipe, and described second switch pipe is N-type pipe.
Backlight circuit the most according to claim 3, it is characterised in that each described
LED string includes the LED of N number of series connection, and N is the integer more than 1；Each described
LED string includes M the compensation LED lamp connected, and M is more than or equal to 1 integer；
Wherein,
The positive pole of the 1st LED of each described LED string be connected with each other and with institute
State and drive the positive pole of output current source to connect, n-th LED of each described LED string
The negative pole of lamp connects the 1st compensation of corresponding described compensation LED lamp string respectively
The positive pole of LED and the drain electrode of described first switching tube, each described compensation LED lamp string
The negative pole of m-th LED connect the drain electrode of corresponding described second switch pipe.
5. the driving method of a backlight circuit, it is characterised in that described backlight circuit bag
Include: LED group, controller unit, LED drive unit, temperature sensing unit, bright
Degree compensating unit, described LED drive unit is under the control of described controller unit
Output driving current is to drive the luminescence of described LED group, described temperature sensing unit and institute
State luminance compensation unit to be all connected with described controller unit, described backlight drive circuit
Driving method comprises the steps:
By described temperature sensing unit, the temperature of described LED group is generated with described
The corresponding temperature signal of LED group, and pass to described controller unit and process；
Described controller unit, according to described temperature signal, controls described LED drive unit
The size of output current value, to regulate the temperature of LED group, controls described brightness simultaneously
The brightness of described LED group is compensated by compensating unit；
Described LED group includes the LED string of multiple parallel connection, described luminance compensation list
Unit includes multiple luminance adjustment module, defeated according to comparator unit of described controller unit
Go out output control luminance compensation unit the brightness of LED group is adjusted, specifically include:
Described controller unit is according to the output output control of described comparator unit described in each
Luminance adjustment module is with to the described LED string corresponding to luminance adjustment module this described
Brightness is adjusted, to regulate the brightness of this LED string.
The driving method of backlight circuit the most according to claim 5, it is characterised in that
Described backlight circuit also includes: AD conversion unit, comparator unit, and described modulus turns
Exchange unit is connected with described temperature sensing unit, the normal phase input end of described comparator with
Described AD conversion unit connects, anti-phase input termination reference voltage, and output termination controls
Device unit,
Described by described temperature sensing unit, the temperature of described LED group is generated and institute
State the corresponding temperature signal of LED group, and pass to described controller unit and process
Specifically include:
By described temperature sensing unit, the temperature of described LED group is generated with described
The corresponding temperature signal of LED group；
By described AD conversion unit, the described temperature signal of analog quantity is converted into numeral
The voltage signal of amount；
Big by the more described voltage signal of described comparator unit and described reference voltage
Little, if voltage signal exports high level more than reference voltage, described comparator unit, if
Voltage signal is less than reference voltage, described comparator unit output low level；
Described controller unit is according to bright described in the output output control of described comparator unit
The brightness of LED group is adjusted by degree compensating unit.
The driving method of backlight circuit the most according to claim 6, it is characterised in that
When described comparator unit exports high level, and described controller unit is according to described comparator
The brightness of LED group is adjusted by luminance compensation unit described in the output output control of unit
Also include after joint:
The temperature being sensed described LED group by described temperature sensing unit is reduced, described
Controller unit output low level, and driven by the described controller unit described LED of control
The current value of moving cell output.
The driving method of backlight circuit the most according to claim 5, it is characterised in that
Described luminance adjustment module includes: compensation LED lamp string, the first switching tube, second switch
Pipe；Wherein, described first switching tube is p-type pipe, and described second switch pipe is N-type pipe,
Described controller unit is according to the output output control of described comparator unit described in each
Luminance adjustment module is with to the described LED string corresponding to luminance adjustment module this described
Brightness is adjusted specifically including:
Described controller unit is opened according to the output output control first of described comparator unit
Close pipe and second switch pipe is switched on or off, to control described compensation LED lamp string to LED
The regulation of lamp group brightness.
9. a backlight module, it is characterised in that described backlight module includes claim
Backlight circuit described in any one in 1 to 4.
10. a display device, it is characterised in that described display device includes that right is wanted
Seek the backlight module described in 9.
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| CN201410280997.0A CN104091570B (en) | 2014-06-20 | 2014-06-20 | Backlight circuit and driving method, backlight module, display device |
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| CN201410280997.0A CN104091570B (en) | 2014-06-20 | 2014-06-20 | Backlight circuit and driving method, backlight module, display device |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105741716A (en) * | 2014-12-12 | 2016-07-06 | 环旭电子股份有限公司 | Display device and backlight intensity adjustment method thereof |
| CN106935207B (en) * | 2015-12-29 | 2020-06-19 | 北京小米移动软件有限公司 | Brightness control method and device |
| CN105575340A (en) * | 2016-03-07 | 2016-05-11 | 合一智能科技（深圳）有限公司 | Backlight brightness control system and method |
| CN105913812A (en) * | 2016-06-30 | 2016-08-31 | 宇龙计算机通信科技(深圳)有限公司 | Method and device for adjusting LCD backlight brightness of terminal as well as terminal |
| CN106205507B (en) | 2016-08-30 | 2018-11-20 | 京东方科技集团股份有限公司 | Backlight drive circuit |
| CN108922479B (en) * | 2018-07-26 | 2022-01-25 | 北京小米移动软件有限公司 | Method and device for managing liquid crystal display module |
| CN110264944A (en) * | 2019-06-20 | 2019-09-20 | 深圳市艾希亿智能科技有限公司 | Oil price display system and its luminance compensation method |
| CN113641197A (en) * | 2020-04-27 | 2021-11-12 | 神讯电脑(昆山)有限公司 | AB shell temperature control circuit of notebook computer and control method thereof |
| CN112002287A (en) * | 2020-08-31 | 2020-11-27 | 上海创功通讯技术有限公司 | Brightness compensation method of backlight circuit and electronic equipment storage medium |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1949356A (en) * | 2005-10-13 | 2007-04-18 | 三星电子株式会社 | Liquid crystal display apparatus capable of automatic gamma and brightness correction |
| CN100474583C (en) * | 2004-09-30 | 2009-04-01 | 奥斯兰姆奥普托半导体有限责任公司 | LED array with temperature sensor |
| CN102013234A (en) * | 2010-12-28 | 2011-04-13 | 友达光电股份有限公司 | Equipment for adjusting backlight brightness based on temperature detection in liquid crystal panel |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4182930B2 (en) * | 2004-07-12 | 2008-11-19 | ソニー株式会社 | Display device and backlight device |
| CN100583215C (en) * | 2008-08-20 | 2010-01-20 | 青岛海信电器股份有限公司 | LED backlight module and its temperature control method |
| JP5214809B2 (en) * | 2009-10-07 | 2013-06-19 | シャープ株式会社 | Liquid crystal display |
| TWI553603B (en) * | 2012-08-27 | 2016-10-11 | 群邁通訊股份有限公司 | Control circuit for backlight modules |
| CN102968961B (en) * | 2012-11-15 | 2015-04-08 | 京东方科技集团股份有限公司 | Control method, backlight control circuit, liquid crystal display (LCD) panel and LCD |
| CN103606352A (en) * | 2013-11-15 | 2014-02-26 | 深圳市华星光电技术有限公司 | A backlight drive circuit, a driving method thereof, a backlight module and a liquid crystal display |
-
2014
- 2014-06-20 CN CN201410280997.0A patent/CN104091570B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100474583C (en) * | 2004-09-30 | 2009-04-01 | 奥斯兰姆奥普托半导体有限责任公司 | LED array with temperature sensor |
| CN1949356A (en) * | 2005-10-13 | 2007-04-18 | 三星电子株式会社 | Liquid crystal display apparatus capable of automatic gamma and brightness correction |
| CN102013234A (en) * | 2010-12-28 | 2011-04-13 | 友达光电股份有限公司 | Equipment for adjusting backlight brightness based on temperature detection in liquid crystal panel |
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