CN104091570A - Backlight circuit, driving method of backlight circuit, backlight module and display device - Google Patents
Backlight circuit, driving method of backlight circuit, backlight module and display device Download PDFInfo
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Abstract
The invention provides a backlight circuit, a driving method of the backlight circuit, a backlight module and a display device and belongs to the technical field of backlight display. The problem that an LED lamp in an existing backlight circuit is short in service life due to high temperature during working can be solved. The backlight circuit comprises an LED lamp group, a controller unit, an LED driving unit, a temperature sensing unit and a brightness compensation unit. The LED driving unit is used for outputting constant current under the control of the controller unit so as to drive the LED lamp group to emit light, and the temperature sensing unit is used for generating a temperature signal corresponding to the LED lamp group according to the temperature of the LED lamp group and connected with the controller unit. The controller unit is used for controlling an output current value of the LED driving unit according to the temperature signal so as to adjust the temperature of the LED lamp group. The brightness compensation unit is used for compensating the brightness of the LED lamp group under the control of the controller unit according to the temperature signal.
Description
Technical field
The invention belongs to display technique backlight field, be specifically related to a kind of backlight circuit and driving method thereof, backlight module, display device.
Background technology
At present, light emitting diodde desplay device (Light Emitting Diode; LED) as the 4th generation light source, because the advantages such as its energy-saving and environmental protection, life-span are long have development prospect.
As everyone knows, the luminescence efficiency of LED lamp is higher and energy consumption is less, has now been widely used in all kinds of places.LED lamp is very responsive to temperature, and temperature raises can affect life-span, light efficiency, colour temperature and the forward voltage of LED lamp, maximum Injection Current, luminosity, colourity, electric parameter and reliability etc.When LED lamp group provides light source for LCD module, along with the rising of LED temperature, identical drive current can cause LCD display brightness and colourity to change, thereby affects reliability and the serviceable life of LED lamp.
Inventor finds that in prior art, at least there are the following problems: while specifically the LED lamp group of LED lamp composition being applied in the backlight module of display device, along with the rising of the temperature of LED lamp group, identical drive current can cause brightness and the colourity of the demonstration of display device to change, thereby causes showing bad.
Summary of the invention
Technical matters to be solved by this invention comprises, the problems referred to above that exist for existing backlight circuit provide the backlight circuit of a kind of long service life, better performances and driving method thereof, display device.
The technical scheme that solution the technology of the present invention problem adopts is a kind of backlight circuit, comprising: LED lamp group, controller unit, LED driver element, temperature sensing unit and luminance compensation unit;
Described LED driver element is used under the control of described controller unit, exporting steady current to drive described LED lamp group luminous,
Described temperature sensing unit is used for generating and the corresponding temperature signal of described LED lamp group according to the temperature of described LED lamp group, and is connected with described controller unit;
Described controller unit, for according to described temperature signal, is controlled the size of described LED driver element output current value, to regulate the temperature of LED lamp group;
Described luminance compensation unit is under the control of described controller unit, according to described temperature signal so that the brightness of described LED lamp group is compensated.
Because backlight circuit of the present invention comprises temperature sensing unit and luminance compensation unit, so in the time that LED lamp group is worked, can pass through the temperature signal of temperature sensing unit induction LED lamp group, controller unit judges the temperature conditions of LED lamp group according to this temperature signal information, thereby by regulating the current value of LED driver element output to regulate the temperature of LED lamp group, the temperature conditions of the LED lamp group that luminance compensation unit judges according to controller unit is simultaneously to regulate the brightness of LED lamp group, specifically, in the time that the temperature of LED lamp group is normal, luminance compensation unit is not worked, the luminous current value of LED driver element output driven LED lamp group, when the temperature anomaly of LED lamp group is when namely temperature is higher than normal temperature, LED driver element is exported the current value that is less than a moment LED lamp group job, to reduce the work efficiency of LED lamp group, reduce luminosity and the temperature of LED lamp group, luminance compensation unit work simultaneously, the luminance loss who carrys out compensation LED lamp group by luminance compensation unit work.The backlight circuit of the present embodiment has solved the problem that existing backlight circuit reduced due to the higher LED of the causing lamp group life-span of temperature, has increased luminance compensation unit simultaneously and has compensated the luminance loss who causes LED lamp group by reducing electric current in prior art.So backlight circuit of the present invention has stronger practicality.
Preferably, described backlight circuit also comprises: AD conversion unit, comparator unit,
Described AD conversion unit is connected with described temperature sensing unit, for converting the temperature signal of described temperature sensing unit output to digital voltage signal output;
The normal phase input end of described comparer receives the voltage signal of described AD conversion unit output, anti-phase input termination reference voltage, output termination controller unit, for described voltage signal and described reference voltage are compared, and give described controller unit according to comparative result outputs level signals.
Preferably, described LED lamp group comprises the LED lamp string of multiple parallel connections, and described luminance compensation unit comprises multiple brightness regulation modules;
Described in each, the input end of LED lamp string links together, and be connected with the positive pole of described LED driver element output, the input end of brightness regulation module described in the output termination one of each described LED lamp string, the negative pole of LED driver element output described in the output termination of each described brightness regulation module.
Further preferably, described brightness regulation module comprises: compensation LED lamp string, the first switching tube, second switch pipe;
The input end of described compensation LED lamp string is connected with the output terminal of described LED lamp string and the drain electrode of described the first switching tube connects, and the output terminal of described compensation LED lamp string is connected with the drain electrode of second switch pipe;
The grid of described the first switching tube is connected with the grid of second switch pipe, and by described controller unit control;
The source electrode of described the first switching tube is connected with the source electrode of second switch pipe, and is connected with the negative pole of described LED driver element output; Wherein,
Described the first switching tube is P type pipe, and described second switch pipe is N-type pipe.
Further preferably, each described LED lamp string comprises the LED lamp of N series connection, and N is greater than 1 integer; Each described compensation LED lamp string comprises the compensation LED lamp of M series connection, and M is for being more than or equal to 1 integer; Wherein,
The positive pole of the 1st LED lamp of each described LED lamp string interconnects and is connected with the positive pole of described driver output current source, the negative pole of N LED lamp of each described LED lamp string connects respectively the positive pole of the 1st compensation LED lamp and the drain electrode of described the first switching tube of the described compensation LED lamp string corresponding with it, and the negative pole of M LED lamp of each described compensation LED lamp string connects the drain electrode of the described second switch pipe corresponding with it.
The technical scheme that solution the technology of the present invention problem adopts is a kind of driving method of backlight circuit, described backlight circuit comprises: LED lamp group, controller unit, LED driver element, temperature sensing unit, luminance compensation unit, described LED driver element under the control of described controller unit output driving current to drive described LED lamp group luminous, described temperature sensing unit is all connected with described controller unit with described luminance compensation unit, and the driving method of described backlight drive circuit comprises the steps:
By described temperature sensing unit, the temperature of described LED lamp group is generated and the corresponding temperature signal of described LED lamp group, and pass to described controller unit and process;
Described controller unit, according to described temperature signal, is controlled the size of described LED driver element output current value, to regulate the temperature of LED lamp group, controls described luminance compensation unit simultaneously the brightness of described LED lamp group is compensated.
Preferably, described backlight circuit also comprises: AD conversion unit, comparator unit, described analog to digital converter unit is connected with described temperature sensing unit, the normal phase input end of described comparer is connected with described AD conversion unit, anti-phase input termination reference voltage, output termination controller unit
Describedly by described temperature sensing unit, the temperature of described LED lamp group is generated and the corresponding temperature signal of described LED lamp group, and passes to described controller unit and process specifically and comprise:
By described temperature sensing unit, the temperature of described LED lamp group is generated and the corresponding temperature signal of described LED lamp group;
By described AD conversion unit, the described temperature signal of analog quantity is converted into the voltage signal of digital quantity;
By the size of the more described voltage signal of described comparator unit and described reference voltage, if voltage signal is greater than reference voltage, described comparator unit output high level, if voltage signal is less than reference voltage, described comparator unit output low level;
Described controller unit regulates the brightness of LED lamp group according to luminance compensation unit described in the Output rusults control of described comparator unit.
Further preferably, when described comparator unit output high level, described controller unit also comprises after the brightness of LED lamp group being regulated according to luminance compensation unit described in the Output rusults control of described comparator unit:
The temperature of responding to described LED lamp group by described temperature sensing unit reduces, described controller unit output low level, and by the current value of LED driver element output described in described controller unit control.
Further preferably, described LED lamp group comprises the LED lamp string of multiple parallel connections, described luminance compensation unit comprises multiple brightness regulation modules, and described controller unit regulates the brightness of LED lamp group according to the Output rusults control luminance compensation unit of described comparator unit, specifically comprises:
Described controller unit according to the Output rusults control of described comparator unit described in each brightness regulation module so that the brightness of the corresponding described LED lamp string of brightness regulation module described in this is regulated, to regulate the brightness of this LED lamp string.
Further preferably, described brightness regulation module comprises: compensation LED lamp string, the first switching tube, second switch pipe; Wherein, described the first switching tube is P type pipe, described second switch pipe is N-type pipe, described controller unit according to the Output rusults control of described comparator unit described in each brightness regulation module so that the brightness of the corresponding described LED lamp string of brightness regulation module described in this is regulated specifically and to be comprised:
Described controller unit is opened or is turn-offed according to Output rusults control first switching tube of described comparator unit and second switch pipe, to control the adjusting of described compensation LED lamp string to the brightness of LED lamp group.
The technical scheme that solution the technology of the present invention problem adopts is a kind of backlight module, and it comprises above-mentioned backlight circuit.
The technical scheme that solution the technology of the present invention problem adopts is a kind of display device, and it comprises above-mentioned backlight module.
Brief description of the drawings
Fig. 1 is a kind of schematic diagram of embodiments of the invention 1 and 2 backlight circuits;
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 structural representation of the backlight circuit of embodiments of the invention 1 and 2;
Wherein Reference numeral is: 1, controller unit; 2, LED lamp group; 3, luminance compensation module; 4, LED driver element; 5, temperature sensing unit; 6, AD conversion unit; 7, comparator unit.
Embodiment
For making those skilled in the art understand better technical scheme of the present invention, below in conjunction with 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, and it comprises: LED lamp group 2, controller unit 1, LED driver element 4, temperature sensing unit 5, luminance compensation unit 3; Wherein, described LED driver element 4 for output driving current under the control at described controller unit 1 to drive described LED lamp group 2 luminous; Described temperature sensing unit 5 is for generating and the corresponding temperature signal of described LED lamp group 2 according to the temperature of described LED lamp group 2, and with described controller unit; Described controller unit 1, for according to described temperature signal, is controlled the size of described LED driver element 4 output current values, to regulate the temperature of LED lamp group 2; Described luminance compensation unit 3 is under the control of described controller unit, according to described temperature signal so that the temperature of described LED lamp group 2 is regulated.
It should be noted that, LED driver element 4 in the present embodiment can be inputted constant current value for LED lamp group 2, and the size of this current value is controlled by control module 1, brightness and the temperature of LED lamp group 2 have been determined simultaneously, and the brightness of the larger LED lamp of current value group 2 is higher and temperature is also high, what certainly can understand is that the maximal value of brightness is certain, and the darker temperature of brightness of the less LED lamp of current value group 2 is lower.
Because the backlight circuit of the present embodiment comprises temperature sensing unit 5 and luminance compensation unit 3, so in the time that LED lamp group 2 is worked, can pass through the temperature signal of temperature sensing unit 5 induction LED lamp groups 2, controller unit 1 judges the temperature conditions of LED lamp group 2 according to this temperature signal information, thereby regulate the temperature of LED lamp group 2 by the current value that regulates LED driver element 4 to export, the temperature conditions of the LED lamp group 2 that luminance compensation unit 3 judges according to controller unit 1 is simultaneously to regulate the brightness of LED lamp group 2, specifically, in the time that the temperature of LED lamp group 2 is normal, luminance compensation unit 3 is not worked, LED driver element 4 is exported the luminous current value of driven LED lamp group 2, when the temperature anomaly of LED lamp group 2 is when namely temperature is higher than normal temperature, 4 outputs of LED driver element are less than the current value that a moment LED lamp group 2 is worked, to reduce the work efficiency of LED, reduce luminosity and the temperature of LED lamp group 2, luminance compensation unit 3 is worked simultaneously, the luminance loss who carrys out compensation LED lamp group 2 by luminance compensation unit 3 work.The backlight circuit of the present embodiment has solved the problem that existing backlight circuit reduced due to 2 life-spans of the higher LED of the causing lamp of temperature group, has increased luminance compensation unit 3 simultaneously and has compensated the luminance loss who causes LED lamp group 2 by reducing electric current in prior art.The backlight circuit of the present embodiment has stronger practicality thus.
As shown in Figure 2, preferably, the backlight circuit of the present embodiment also comprises: AD conversion unit 6, comparator unit 7, analog to digital converter unit 6 is connected with described temperature sensing unit 5, for described temperature sensing unit 5 being generated to the voltage signal that converts digital quantity with the corresponding temperature signal of described LED lamp group 2 to; The normal phase input end of comparer is connected with described AD conversion unit 6, anti-phase input termination reference voltage, and output termination controller unit 1, for controlling luminance compensation unit 3.Specifically, in the time that the voltage signal of comparator unit 7 normal phase input end inputs is less than the reference voltage of its inverting input input, the output terminal output low level of comparator unit 7, the temperature that LED lamp group 2 is now described is normal temperature, now LED driver element 4 keeps former output current, and luminance compensation unit 3 is not worked, in the time that the voltage signal of comparator unit 7 normal phase input end inputs is greater than the reference voltage of its inverting input input, the output terminal output high level of comparator unit 7, now illustrate that the temperature of LED lamp group 2 is higher than normal temperature, now reduce by controller unit 1 current value that LED driver element 4 is exported, namely reduce the temperature of LED lamp group 2, control luminance compensation unit 3 works and luminously compensates with the luminance loss that the current reduction of LED lamp group 2 is caused simultaneously, in the time that LED lamp group 2 is reduced to normal temperature along with the variation of time, when the voltage signal that the temperature signal namely sensing when temperature sensing unit 5 is changed by AD conversion unit 6 is less than the reference voltage that controller unit 1 inputs, controller unit 1 is controlled LED driver element 4 and is exported primary current value (current value when namely LED lamp group 2 is started working).
Shown in concrete combination Fig. 3, described LED lamp group 2 comprises the LED lamp string of multiple parallel connections in the present embodiment, and described luminance compensation unit 3 comprises multiple brightness regulation modules; Described in each, the input end of LED lamp string links together, and be connected with the anodal LEDA of described LED driver element output, the input end of brightness regulation module described in the output termination one of each described LED lamp string, the negative pole LEDK of LED driver element output described in the output termination of each described brightness regulation module.Now on each LED lamp string, a brightness regulation module is set, thereby makes on the backlight circuit after whole luminance compensation brightness more even.
Further preferably, described brightness regulation module comprises: compensation LED lamp string, the first switching tube, second switch pipe; The input end of described compensation LED lamp string is connected with the output terminal of described LED lamp string and the drain electrode of described the first switching tube connects, and output terminal is connected with the drain electrode of second switch pipe; The grid of described the first switching tube is connected with the grid of second switch pipe, and controls by described controller unit 1; The source electrode of described the first switching tube is connected with the source electrode of second switch pipe, and is connected with the negative pole LEDK of described LED driver element output; Wherein, described the first switching tube is P type pipe, and described second switch pipe is N-type pipe.Specifically, in the time of controller unit 1 output low level, namely LED lamp group 2 temperature are when normal, and the first switching tube is opened, and second switch pipe turn-offs, and now compensation LED lamp string is not luminous; In the time that controller unit 1 is exported high level, when namely LED lamp group 2 temperature are higher than normal temperature, LED driver element 4 reduces the current value of its input, and the first switching tube turn-offs simultaneously, second switch pipe is opened, and now compensation LED lamp string is luminous so that the luminance loss of LED lamp group 2 is compensated.
Still more preferably, each described LED lamp string comprises the LED lamp D of N series connection
n, N is greater than 1 integer; Each described compensation LED lamp string comprises the compensation LED lamp D ' of M series connection
m, M is more than or equal to 1 integer; Wherein, the positive pole of the 1st compensation LED lamp of each described LED lamp string interconnects and is connected with the positive pole of described driver output current source, the negative pole of N LED lamp of each described LED lamp string connects respectively the positive pole of the 1st LED lamp D ' 1 and the drain electrode of described the first switching tube of the described compensation LED lamp string corresponding with it, and the negative pole of M LED lamp of each described compensation LED lamp string connects the drain electrode of the described second switch pipe corresponding with it.For example say that each LED lamp string comprises the LED lamp of 4 series connection, each compensation LED lamp string comprises a compensation LED lamp.
Embodiment 2:
In conjunction with the backlight circuit shown in Fig. 1 to 3, the present embodiment provides a kind of driving method of backlight circuit, and this backlight circuit can be the backlight circuit described in embodiment 1, and described driving method specifically can comprise:
By described temperature sensing unit 5, the temperature of described LED lamp group 2 is generated and the corresponding temperature signal of described LED lamp group 2, and pass to described controller unit and process;
Wherein, described backlight circuit also comprises: AD conversion unit 6, comparator unit 7, described analog to digital converter unit 6 is connected with described temperature sensing unit 5, the normal phase input end of described comparer is connected with described AD conversion unit 6, anti-phase input termination reference voltage, output termination controller unit 1, above-mentioned steps specifically can comprise:
By described temperature sensing unit 5, the temperature of described LED lamp group 2 is generated and the corresponding temperature signal of described LED lamp group 2;
By described AD conversion unit 6, the described temperature signal of analog quantity is converted into the voltage signal of digital quantity;
By the size of the more described voltage signal of described comparator unit 7 and described reference voltage, if voltage signal is greater than reference voltage, described comparator unit 7 is exported high level, if voltage signal is less than reference voltage, and described comparator unit 7 output low levels;
Described controller unit 1 regulates the brightness of LED lamp group 2 according to luminance compensation unit 3 described in the Output rusults control of described comparator unit 7.
Described controller unit 1, according to described temperature signal, is controlled the size of described LED driver element 4 output current values, to regulate the temperature of LED lamp group 2, controls described luminance compensation unit 3 simultaneously the brightness of described LED lamp group 2 is compensated.
In above-mentioned steps, when described comparator unit 7 is exported high level, described controller unit 1 also comprises after the brightness of LED lamp group 2 being regulated according to luminance compensation unit 3 described in the Output rusults control of described comparator unit 7:
The temperature of responding to described LED lamp group 2 by described temperature sensing unit 5 reduces, described controller unit 1 output low level, and control by described controller unit 1 current value that described LED driver element 4 is exported, the current value that now LED driver element 4 is exported is primary current value.
Wherein, described LED lamp group 2 comprises the LED lamp string of multiple parallel connections, described luminance compensation unit 3 comprises multiple brightness regulation modules, the brightness of LED lamp group 2 is regulated according to the Output rusults control luminance compensation unit 3 of described comparator unit 7 at controller unit 1 described in above-mentioned steps, specifically comprises:
Described controller unit 1 according to the Output rusults control of described comparator unit 7 described in each brightness regulation module so that the brightness of the corresponding described LED lamp string of brightness regulation module described in this is regulated, to regulate the brightness of this LED lamp string.
Still more preferably, described brightness regulation module comprises: compensation LED lamp string, the first switching tube, second switch pipe; Wherein, described the first switching tube is P type pipe, described second switch pipe is N-type pipe, described controller unit 1 according to the Output rusults control of described comparator unit 7 described in each brightness regulation module so that the brightness of the corresponding described LED lamp string of brightness regulation module described in this is regulated specifically and to be comprised:
Described controller unit 1 is opened or is turn-offed according to Output rusults control first switching tube of described comparator unit 7 and second switch pipe, to control the adjusting of described compensation LED lamp string to 2 brightness of LED lamp group.
In order better to understand the driving method of the present embodiment, comprise 4 LED lamp strings with LED lamp group 2, each LED lamp string comprises 4 LED lamps (D1, D2, D3, D4), 4 compensation LED lamp strings, each compensation side optical module comprises that the second switch pipe of 1 compensation LED lamp (D ' 1), P type the first switching tube, N-type is that example describes.
As shown in Figure 1,4 LED lamp series connection of each LED lamp string, the positive pole of first LED lamp meets the anodal LEDA that LED driver element 4 is exported, the 4th negative pole of LED lamp and the positive pole of compensation LED lamp are connected, be 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 is connected with the grid of second switch pipe and receives on controller unit 1, and the first switching tube is connected with the source electrode of second switch pipe and receives the negative pole LEDK (K is more than or equal to 1 integer) that LED driver element 4 is exported.
As shown in Figure 2, this backlight circuit is temperature sensing unit 5 also, AD conversion unit 6, comparator unit 7 and controller unit 1.Temperature sensing unit 5 temperature sensor signals, and the reference voltage V inputted of the corresponding voltage signal that this temperature signal is exported by AD conversion unit 6 and comparator unit 7
refrelatively, if be less than reference voltage value, comparator unit 7 output low levels, illustrate that LED lamp group 2 temperature are normal, now controller unit 1 output low level is opened to LED lamp group 2, the first switching tubes, second switch pipe is closed, and compensation LED lamp does not work, the normal output current of LED driver element 4; If be greater than reference voltage value, comparator unit 7 is exported high level, the working temperature that LED lamp group 2 is described is higher, controller unit 1 is controlled and is reduced the current value that LED driver element 4 is exported, and controller unit 1 is exported high level signal to luminance compensation unit 3 simultaneously, and second switch pipe is opened, the first switching tube is closed, make compensation LED lamp luminous, to compensate the luminance loss of the LED lamp group 2 causing due to current reduction, extend the LED life-span simultaneously.In the time that the temperature of LED lamp group 2 is reduced to voltage signal that temperature sensing unit 5 and AD conversion unit 6 export and is less than reference voltage value, controller unit 1 again output low level to luminance compensation unit 3, the normal output primary current of LED driver element 4 value simultaneously.
Embodiment 3:
The present embodiment provides a kind of backlight module, and it comprises the backlight circuit in embodiment 1, and this backlight module can be to be also side entering type for straight-down negative, and this backlight module also comprises the known device such as diffuser plate, optical film, does not describe in detail one by one at this.
Because the backlight module of the present embodiment comprises the backlight circuit of embodiment 1, therefore its life-span is longer, practicality is stronger.
Embodiment 4:
The present embodiment provides a kind of display device, and it comprises the backlight module in embodiment 3, and it also comprises array base palte, color membrane substrates etc. known structure.
Because the display device of the present embodiment comprises the backlight module of embodiment 3, therefore its quality is higher, display effect is better.
Display device in the present embodiment can also be: any product or parts with Presentation Function such as liquid crystal panel, Electronic Paper, LCD TV, liquid crystal display, digital album (digital photo frame), mobile phone, panel computer.
The display device of the present embodiment comprise array base palte described in embodiment 1, therefore its display quality is higher.
Be understandable that, above embodiment is only used to principle of the present invention is described and the illustrative embodiments that adopts, but the present invention is not limited thereto.For those skilled in the art, without departing from the spirit and substance in the present invention, can make various modification and improvement, these modification and improvement are also considered as protection scope of the present invention.
Claims (12)
1. a backlight circuit, comprise: LED lamp group, controller unit, LED driver element, described LED driver element for exporting steady current to drive described LED lamp group luminous under the control of described controller unit, it is characterized in that, described backlight circuit also comprises temperature sensing unit and luminance compensation unit;
Described temperature sensing unit is used for generating and the corresponding temperature signal of described LED lamp group according to the temperature of described LED lamp group, and is connected with described controller unit;
Described controller unit, for according to described temperature signal, is controlled the size of described LED driver element output current value, to regulate the temperature of LED lamp group;
Described luminance compensation unit is under the control of described controller unit, according to described temperature signal so that the brightness of described LED lamp group is compensated.
2. backlight circuit according to claim 1, is characterized in that, described backlight circuit also comprises: AD conversion unit, comparator unit,
Described AD conversion unit is connected with described temperature sensing unit, for converting the temperature signal of described temperature sensing unit output to digital voltage signal output;
The normal phase input end of described comparer receives the voltage signal of described AD conversion unit output, anti-phase input termination reference voltage, output termination controller unit, for described voltage signal and described reference voltage are compared, and give described controller unit according to comparative result outputs level signals.
3. backlight circuit according to claim 1 and 2, is characterized in that, described LED lamp group comprises the LED lamp string of multiple parallel connections, and described luminance compensation unit comprises multiple brightness regulation modules;
Described in each, the input end of LED lamp string links together, and be connected with the positive pole of described LED driver element output, the input end of brightness regulation module described in the output termination one of each described LED lamp string, the negative pole of LED driver element output described in the output termination of each described brightness regulation module.
4. backlight circuit according to claim 3, is characterized in that, described brightness regulation module comprises: compensation LED lamp string, the first switching tube, second switch pipe;
The input end of described compensation LED lamp string is connected with the output terminal of described LED lamp string and the drain electrode of described the first switching tube, and the output terminal of described compensation LED lamp string is connected with the drain electrode of second switch pipe;
The grid of described the first switching tube is connected with the grid of second switch pipe, and by described controller unit control;
The source electrode of described the first switching tube is connected with the source electrode of second switch pipe, and is connected with the negative pole of described LED driver element output; Wherein,
Described the first switching tube is P type pipe, and described second switch pipe is N-type pipe.
5. backlight circuit according to claim 4, is characterized in that, each described LED lamp string comprises the LED lamp of N series connection, and N is greater than 1 integer; Each described LED lamp string comprises the compensation LED lamp of M series connection, and M is for being more than or equal to 1 integer; Wherein,
The positive pole of the 1st LED lamp of each described LED lamp string interconnects and is connected with the positive pole of described driver output current source, the negative pole of N LED lamp of each described LED lamp string connects respectively the positive pole of the 1st compensation LED lamp and the drain electrode of described the first switching tube of the described compensation LED lamp string corresponding with it, and the negative pole of M LED lamp of each described compensation LED lamp string connects the drain electrode of the described second switch pipe corresponding with it.
6. the driving method of a backlight circuit, it is characterized in that, described backlight circuit comprises: LED lamp group, controller unit, LED driver element, temperature sensing unit, luminance compensation unit, described LED driver element under the control of described controller unit output driving current to drive described LED lamp group luminous, described temperature sensing unit is all connected with described controller unit with described luminance compensation unit, and the driving method of described backlight drive circuit comprises the steps:
By described temperature sensing unit, the temperature of described LED lamp group is generated and the corresponding temperature signal of described LED lamp group, and pass to described controller unit and process;
Described controller unit, according to described temperature signal, is controlled the size of described LED driver element output current value, to regulate the temperature of LED lamp group, controls described luminance compensation unit simultaneously the brightness of described LED lamp group is compensated.
7. the driving method of backlight circuit according to claim 6, it is characterized in that, described backlight circuit also comprises: AD conversion unit, comparator unit, described analog to digital converter unit is connected with described temperature sensing unit, the normal phase input end of described comparer is connected with described AD conversion unit, anti-phase input termination reference voltage, output termination controller unit
Describedly by described temperature sensing unit, the temperature of described LED lamp group is generated and the corresponding temperature signal of described LED lamp group, and passes to described controller unit and process specifically and comprise:
By described temperature sensing unit, the temperature of described LED lamp group is generated and the corresponding temperature signal of described LED lamp group;
By described AD conversion unit, the described temperature signal of analog quantity is converted into the voltage signal of digital quantity;
By the size of the more described voltage signal of described comparator unit and described reference voltage, if voltage signal is greater than reference voltage, described comparator unit output high level, if voltage signal is less than reference voltage, described comparator unit output low level;
Described controller unit regulates the brightness of LED lamp group according to luminance compensation unit described in the Output rusults control of described comparator unit.
8. the driving method of backlight circuit according to claim 7, it is characterized in that, when described comparator unit output high level, described controller unit also comprises after the brightness of LED lamp group being regulated according to luminance compensation unit described in the Output rusults control of described comparator unit:
The temperature of responding to described LED lamp group by described temperature sensing unit reduces, described controller unit output low level, and by the current value of LED driver element output described in described controller unit control.
9. the driving method of backlight circuit according to claim 7, it is characterized in that, described LED lamp group comprises the LED lamp string of multiple parallel connections, described luminance compensation unit comprises multiple brightness regulation modules, described controller unit regulates the brightness of LED lamp group according to the Output rusults control luminance compensation unit of described comparator unit, specifically comprises:
Described controller unit according to the Output rusults control of described comparator unit described in each brightness regulation module so that the brightness of the corresponding described LED lamp string of brightness regulation module described in this is regulated, to regulate the brightness of this LED lamp string.
10. the driving method of backlight circuit according to claim 9, is characterized in that, described brightness regulation module comprises: compensation LED lamp string, the first switching tube, second switch pipe; Wherein, described the first switching tube is P type pipe, described second switch pipe is N-type pipe, described controller unit according to the Output rusults control of described comparator unit described in each brightness regulation module so that the brightness of the corresponding described LED lamp string of brightness regulation module described in this is regulated specifically and to be comprised:
Described controller unit is opened or is turn-offed according to Output rusults control first switching tube of described comparator unit and second switch pipe, to control the adjusting of described compensation LED lamp string to the brightness of LED lamp group.
11. 1 kinds of backlight modules, is characterized in that, described backlight module comprises the backlight circuit described in any one in claim 1 to 5.
12. 1 kinds of display device, is characterized in that, described display device comprises the backlight module described in claim 11.
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| CN106935207A (en) * | 2015-12-29 | 2017-07-07 | 小米科技有限责任公司 | Brightness control method and device |
| CN108922479A (en) * | 2018-07-26 | 2018-11-30 | 北京小米移动软件有限公司 | The method and apparatus for managing liquid crystal display die set |
| 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 |
| 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 |
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| 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 |
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