CN102968961B - Control method, backlight control circuit, liquid crystal display (LCD) panel and LCD - Google Patents
Control method, backlight control circuit, liquid crystal display (LCD) panel and LCD Download PDFInfo
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- CN102968961B CN102968961B CN201210460771.XA CN201210460771A CN102968961B CN 102968961 B CN102968961 B CN 102968961B CN 201210460771 A CN201210460771 A CN 201210460771A CN 102968961 B CN102968961 B CN 102968961B
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Abstract
The invention discloses a control method, a backlight control circuit, a liquid crystal display (LCD) panel and an LCD, aiming at solving the problem that a circuit is cut off by over-temperature protection in the prior art. The backlight control circuit comprises a backlight, a drive circuit, a control circuit and a temperature detection circuit connected with the control circuit, wherein the temperature detection circuit is used for detecting the temperature, and comparing the temperature value with the preset temperature threshold value; and the control circuit is used for controlling the drive circuit to adjust the current duty ratio of the current of the backlight according to processing signals output based on the comparison results, and controlling the current effective value to be within the current effective value variation range matched with the temperature threshold value, thus guaranteeing electron components to work still normally under the condition of exceeding the specified parameters.
Description
Technical field
The present invention relates to liquid crystal display and manufacture field, particularly relate to a kind of control method, backlight control circuit, display panels and liquid crystal display.
Background technology
Along with development and the user's request of liquid crystal technology, the size of LCDs is also increasing, and thus the size of display panels is also thereupon increasing.
In prior art, LED (Light Emitting Diode, light emitting diode) lamp string is widely used in large-sized display panels, as backlight.In backlight control circuit, during driving circuit driving backlight, need to control multi-string LED lamp string simultaneously, regulated the size of electric current by driving circuit, accurately control the electric current of each LED string.But along with the increase of LCD board size, LED string number increases thereupon, and the electric current of each LED string also increases thereupon, LED backlight control circuit overall power is increased, and current effective value increases, and the temperature of electronic devices and components working environment also increases.
Display panels generally can need to work long hours, and the temperature of working environment is higher, the display panels worked long hours, and because heat radiation is more difficult, backlight control circuit bulk temperature can be caused to raise.Electronic devices and components are in the state of high temperature for a long time, can make significantly reduce the serviceable life of electronic devices and components.
In prior art; in order to prevent operating ambient temperature too high; affect electronic devices and components usability; the mode of usual employing overheat protector is protected circuit; cause the operating ambient temperature of electronic devices and components too high when current effective value is excessive; when exceeding the running parameter that electronic devices and components specify, closing control circuit, thus play a protective role.But the mode of above-mentioned employing overheat protector, when operating ambient temperature exceeds the regulation parameter of electronic devices and components, can make electronic devices and components quit work immediately, thus make electronic devices and components to external world environment adaptive faculty reduce, reduce usable range.
Therefore, existing backlight control circuit still needs perfect further, ensures that electronic devices and components are under the condition exceeding regulation parameter, still can normally work.
Summary of the invention
The object of this invention is to provide a kind of control method, backlight control circuit, display panels and liquid crystal display, to solve in prior art, because overheat protector causes the problem of circuit shut-down.
The object of the invention is to be achieved through the following technical solutions:
One aspect of the present invention provides a kind of control method, and for controlling the backlight control circuit of display panels, the method comprises:
Detected temperatures, and the Temperature numerical that will detect, compare with the threshold temperature preset, according to comparative result output processing signal;
According to described processing signals, the driving circuit controlled in described backlight control circuit regulates the current duty cycle of backlight current, and is controlled in the current effective value variation range of mating with described threshold temperature by the current effective value obtained after adjustment.
The present invention provides a kind of backlight control circuit of display panels on the other hand, comprise the driving circuit that is connected with backlight and the voltage conversion circuit to described backlight input voltage, also comprise: the control circuit be connected with described driving circuit, and the temperature sensing circuit to be connected with described control circuit, wherein
Described temperature sensing circuit, for detected temperatures, and the Temperature numerical that will detect, compare with the threshold temperature preset, according to comparative result output processing signal to described control circuit;
Described control circuit, for receiving the processing signals that described temperature sensing circuit exports, and control according to described processing signals the current duty cycle that described driving circuit regulates backlight current, and the current effective value obtained after adjustment is controlled in the current effective value variation range of mating with described threshold temperature.
Present invention also offers a kind of display panels, this display panel comprises above-mentioned backlight control circuit.
Further aspect of the present invention provides a kind of liquid crystal display, and this liquid crystal display comprises above-mentioned display panels.
Control method provided by the invention, backlight control circuit, display panels and liquid crystal display, add temperature sensing circuit, by temperature sensing circuit detected temperatures, and Temperature numerical corresponding for this temperature and the threshold temperature preset are compared, control circuit controls driving circuit according to the processing signals that comparative result exports and regulates current duty cycle, and current effective value is controlled in the current effective value variation range of mating with threshold temperature, ensure that electronic devices and components are under the condition exceeding regulation parameter, still can normally work.
Accompanying drawing explanation
The control method process flow diagram that Fig. 1 provides for the embodiment of the present invention one;
The structural representation of the backlight control circuit that Fig. 2 provides for the embodiment of the present invention one;
The structural representation of the backlight control circuit that Fig. 3 provides for the embodiment of the present invention two;
Fig. 4 A changes schematic diagram in time for current curve when back light source brightness that the embodiment of the present invention two provides does not exceed human eye brightness sensation;
Fig. 4 B changes schematic diagram in time for temperature curve when back light source brightness that the embodiment of the present invention two provides does not exceed human eye brightness sensation;
Fig. 5 A changes schematic diagram in time for brightness curve when back light source brightness that the embodiment of the present invention two provides exceeds human eye brightness sensation;
Fig. 5 B changes schematic diagram in time for temperature curve when back light source brightness that the embodiment of the present invention two provides exceeds human eye brightness sensation;
The structural representation of the backlight control circuit that Fig. 6 provides for the embodiment of the present invention three;
The structural representation of the backlight control circuit that Fig. 7 provides for the embodiment of the present invention four.
Embodiment
Control method for controlling display panels backlight control circuit provided by the invention, detected temperatures, and the Temperature numerical that will detect, compare with the threshold temperature preset, according to comparative result output processing signal; Then according to this processing signals, the driving circuit controlled in backlight control circuit regulates the current duty cycle of backlight current, and the current effective value obtained after adjustment is controlled in the current effective value variation range of mating with threshold temperature, the power consumption of backlight control circuit can be reduced, and enable electronic devices and components under the environment exceeding regulation parameter, according to actual conditions adjust operation parameter, improve the adaptive faculty of electronic product environment to external world.
The embodiment of the present invention one provides a kind of control method for controlling display panels backlight control circuit, the implementation procedure of the method as shown in Figure 1:
Step S101: detected temperatures.
Concrete, when carrying out temperature detection in the embodiment of the present invention, according to actual conditions, the temperature of specific components and parts in display panels backlight control circuit can be detected, and the temperature of display panels can be detected simultaneously.
Step S102: by the Temperature numerical detected, compares with the threshold temperature preset, and according to comparative result output processing signal.
Step S103: according to processing signals, the driving circuit controlled in backlight control circuit regulates the current duty cycle of backlight current, and is controlled in the current effective value variation range of mating with the threshold temperature preset by the current effective value obtained after adjustment.
Preferably, for avoid exceeding a certain setting threshold temperature after, after directly temperature being reduced, electric current cannot recover, the threshold temperature preset in the embodiment of the present invention can be two threshold values, be respectively high temperature threshold values and low temperature threshold values, temperature is changed between the high temperature threshold values and low temperature threshold values of setting.
More preferred, in the embodiment of the present invention, high temperature threshold values can be set as that the temperature that the current effective value corresponding with backlight high-high brightness mates is corresponding, the temperature that the current effective value that low temperature threshold values is corresponding with the back light source brightness of setting mates is corresponding, and the current effective value corresponding to back light source brightness of setting is lower than current effective value corresponding to backlight high-high brightness, when the Temperature numerical detected is greater than described high temperature threshold values, export the processing signals reducing current effective value; According to the processing signals reducing current effective value, control driving circuit and regulate backlight current dutycycle, in the current effective value variation range that reduction current effective value to low temperature threshold values mates.
Preferred further, after in the current effective value variation range that reduction current effective value to low temperature threshold values mates, can also judge whether exceed the brightness that human eye brightness sensation is corresponding by the back light source brightness that current effective value variation range that low temperature threshold values mates is corresponding further; Because the brightness sensation difference of human eye is decided by that relative brightness changes, after in the current effective value variation range that reduction current effective value to low temperature threshold values mates, if exceed the brightness that human eye brightness sensation is corresponding, then control current effective value in the current effective value variation range of mating with low temperature threshold values; If do not exceed the brightness that human eye brightness sensation is corresponding, then control in the current effective value variation range of the threshold temperature commensurate in scope that current effective value defines at high temperature threshold values and low temperature threshold values.
Further, heat radiation power consumption in backlight control circuit depends primarily on the size of pressure reduction in backlight between each lamp string and electric current, because the electric current flowing through each lamp string is larger, even if therefore pressure reduction is very little, a lot of heat radiation power consumptions also can be caused, therefore, preferred in the embodiment of the present invention, the pressure reduction of each lamp string in backlight can be detected, and whether the voltage of more each lamp string is identical, when voltage is different, output voltage processing signals; According to this voltage processing signals, control driving circuit and regulate current duty cycle, the current effective value that each lamp string is exported is identical, reaches back light source brightness balanced also minimizing heat radiation power consumption, reduces temperature.
More preferred, because lamp number often a string in backlight is subject to the restriction of both end voltage, when a number of connecting is more, the voltage that voltage conversion circuit exports cannot meet the needs of lamp string, but the voltage that voltage conversion circuit exports crosses the decline that conference causes efficiency, therefore, backlight is inputed to after the voltage inversion that voltage conversion circuit in backlight control circuit can be exported in the embodiment of the present invention, the pressure reduction of lamp string is made to become original 2 times like this, can to connect more lamp string, the use of the number of channels of backlight driver in driving circuit can be reduced, a nearly step reduces the quantity of backlight driver, reduce the usage quantity of electronic devices and components in backlight control circuit, reduce power consumption, and reduce use cost.
The embodiment of the present invention two is based on the theory identical with the control method that embodiment provides, additionally provide a kind of backlight control circuit, the structural representation of this backlight control circuit as shown in Figure 2, comprising: backlight 1, driving circuit 2, control circuit 3 and temperature sensing circuit 4.
Concrete, temperature sensing circuit 4 is connected with control circuit 3, detected temperatures, and by Temperature numerical corresponding for the temperature that detects, compares, according to comparative result output processing signal to control circuit 3 with the threshold temperature preset.
Preferably, in the embodiment of the present invention, temperature sensing circuit 4 is not the temperature only detecting some electronic devices and components, the electric current of these electronic devices and components is controlled, but multiple user is thought that the temperature of important electronic devices and components all detects, further, the overall ambient temperature of backlight control circuit work and the temperature of display panels can also be detected.
Control circuit 3 has with temperature sensing circuit 4 and driving circuit 2 and is connected, receive the processing signals that temperature sensing circuit 4 exports according to comparative result, and regulate current duty cycle according to this processing signals control driving circuit 2, control current effective value and change in the current effective value variation range of mating with design temperature threshold values.
Driving circuit 2 is connected with control circuit 3 with backlight 1, when after the control signal receiving control circuit 3 transmission, regulates current duty cycle, controls the size of current effective value, thus regulate the size of current inputing to backlight 1.
The backlight control circuit that the embodiment of the present invention one provides; the temperature of backlight control circuit and each electronic devices and components is detected by temperature sensing circuit; and temperature value corresponding for this temperature and the threshold temperature preset are compared the corresponding processing signals of rear output to control circuit; driving circuit is controlled by control circuit; regulate current duty cycle; control current effective value changes; ensure that control circuit still can normally work under the condition exceeding regulation parameter, avoid the circuit shut-down problem because overheating protection causes.
The embodiment of the present invention two will obtain backlight control circuit in conjunction with practical application to embodiment one and be described in further detail, and certainly not regard it as and be limited.
In the embodiment of the present invention two, the formation only with regard to temperature sensing circuit 4 is described in detail, and control circuit 3 and driving circuit 2 can adopt existing structure, do not repeat them here.
The embodiment of the present invention can select temperature sensor 41 and single-chip microcomputer 42 to realize detection and the processing capacity of temperature sensing circuit 4, temperature sensor 41 is connected with single-chip microcomputer 42 input pin by bus, the output pin of single-chip microcomputer 42 is connected with control circuit 3, as shown in Figure 3.
Concrete, temperature sensor 41, sets the temperature of electronic devices and components, and is, after Temperature numerical, export single-chip microcomputer 42 to digital quantity form by the temperature transition detected in the temperature that detects display panels and display panels.
Single-chip microcomputer 42, for the Temperature numerical received and the threshold temperature preset are compared, according to the processing signals of comparative result Drazin inverse current effective value to driving circuit 2, with the size of the electric current of driving circuit 2 co-controlling input value backlight 1, reach the object controlling backlight illumination and heat radiation power consumption.
More specifically, select intelligent temperature temperature sensor DS18B20 in the embodiment of the present invention with temperature sensor 41, single-chip microcomputer selects AT89S51A to be that example is described certainly not regard it as and is limited.
The output of DS18B20 adopts digital quantity, without the need to additional temperature conversion circuit, simplify circuit design, and in the present embodiment, the temperature that multiple DS18B20 detects important electronic devices and components temperature, external working environment temperature and the display panels that user sets respectively can be set, the output terminal of multiple DS18B20 is connected with the input pin of chip processor AT89S51 A by a bus, according to internal agreement, the temperature detected is processed accordingly, the temperature of conversion is sent to single-chip microcomputer 42 with serial ports.Single-chip microcomputer 42 reads temperature value according to communication protocol, after corresponding numerical value process is carried out in inside, exports numerical value result.
Further, single-chip microcomputer 42 has the sequence number of oneself by each DS18B20 that bus connects, therefore, cyclic redundancy check (CRC) code CRC check can be passed through, carry out addressing to each DS18B20, the DS18B20 only having address to meet just responds, and receives the order of single-chip microcomputer, send the temperature detected to single-chip microcomputer, make system hardware circuit simpler.
When display panels is started working, electric current can reach setting value instantaneously, and temperature slowly increases, and changes schematic diagram in time with reference to current curve and temperature curve in Fig. 4 A and 4B.Preferably, two threshold temperature are pre-set in the embodiment of the present invention, be respectively high temperature threshold values and low temperature threshold values, after single-chip microcomputer 42 receives the Temperature numerical of DS18B20 output, this temperature value and the high temperature threshold values preset are compared, when temperature exceedes the high temperature threshold values of setting, export the processing signals of reduction current effective value to control circuit 3, control circuit 3 regulates current duty cycle by controlling driving circuit, reduce current effective value in the current effective value variation range of mating with low temperature threshold values, along with the reduction of current effective value, temperature also decreases, after temperature is reduced to low temperature threshold values, show that backlight control circuit has entered in the operating temperature range of setting, without the need to reducing the effective value of electric current again.
High temperature threshold values and low temperature threshold values are set in the embodiment of the present invention respectively, can prevent current effective value from reducing always, after temperature reduces, cannot restoring current, the phenomenon that back light source brightness is reduced always occurs, and while reduction temperature, can avoid the loss of back light source brightness.And the embodiment of the present invention arranges the control that two threshold temperature carry out backlight circuit, when temperature is higher than high temperature threshold values, export the processing signals reducing current effective value, reduce current effective value in the current effective value variation range of described low temperature threshold values coupling, control electric current slowly to change, can prevent temperature from frequently changing up and down near a threshold temperature always, the phenomenon making electric current also thereupon always be in frequent height change at short notice occurs, under guarantee electronic devices and components working temperature exceedes the environment of regulation parameter, while operational factor condition can being carried out according to actual conditions, also the serviceable life of electronic devices and components is extended.
Because the brightness sensation difference of human eye is decided by that relative brightness changes, the logarithm of brightness sensation S and brightness L is linear, and namely brightness is increased to 10 times, and brightness sensation just increases by 1 times, in quite wide brightness variation range, human eye all cannot distinguish brightness change.
In the embodiment of the present invention, when control circuit 3 controls the current effective value of driving circuit 2 reduction input backlight, back light source brightness also decreases, preferably, when the backlight control circuit 3 of the embodiment of the present invention also can be used for judging that current effective value is reduced to the current effective value variation range of low temperature threshold values coupling, whether corresponding back light source brightness exceeds the brightness sensation of human eye, and then regulates the variation range of current effective value again.If exceed, then control current effective value and change in the current effective value variation range of mating with low temperature threshold values; If do not exceed, then change in the current effective value variation range controlling the threshold temperature commensurate in scope that current effective value defines at high temperature threshold values and low temperature threshold values.If do not exceed, then change in the current effective value variation range controlling the threshold temperature commensurate in scope that described current effective value defines at described high temperature threshold values and described low temperature threshold values.
Concrete, when the low temperature threshold values difference that low temperature threshold values sets relatively is less, curent change scope is less, affect not quite on the brightness of back light source brightness and LCDs, human eye None-identified goes out brightness change, change in the current effective value variation range that therefore can control the threshold temperature commensurate in scope that current effective value defines at high temperature threshold values and low temperature threshold values, as shown in figs. 4 a and 4b, after in the current effective value variation range that current effective value is reduced to low temperature threshold values coupling, current duty cycle is regulated by controlling driving circuit 2, elevated currents effective value, current effective value is slowly increased, temperature also can slowly increase thereupon, reach a high temperature threshold values always, control driving circuit 2 by control circuit 3 again and reduce current effective value, temperature is controlled always in the current effective value variation range of the threshold temperature commensurate in scope defined at high temperature threshold values and low temperature threshold values, increase the serviceable life of electronic devices and components, ensure that electronic product still can normally can work under the condition exceeding regulation parameter simultaneously, improve the adaptive faculty of electronic devices and components environmental baseline to external world.
When the high temperature threshold values difference that low temperature threshold values sets relatively is larger, curent change scope is larger, when the back light source brightness corresponding to current effective value variation range of low temperature threshold values coupling exceeds human eye brightness sensation, back light source brightness changes greatly, the screen intensity of LCDs also can change greatly, in order to reduce power consumption, extend the serviceable life of electronic devices and components, under electric current is remained on lower state by the embodiment of the present invention, control current effective value to change in the current effective value variation range of mating with low temperature threshold values, expand product adaptive faculty to external world, as shown in figures 5a and 5b, be respectively brightness curve when back light source brightness exceeds human eye brightness sensation and change schematic diagram in time and temperature changes schematic diagram in time.
More preferred, in the embodiment of the present invention, can be arranged to the temperature that the current effective value corresponding with backlight high-high brightness mate corresponding for high temperature threshold values, low temperature threshold values is arranged to the temperature that the current effective value corresponding with the back light source brightness set mate corresponding, thus can when ensureing that back light source brightness is stable, control temperature changes, reduce the power consumption in backlight control circuit, and regulate the running parameter of electronic devices and components.
Heat radiation power consumption in backlight control circuit depends primarily on the size of pressure reduction in backlight between each lamp string and electric current, because the electric current flowing through each lamp string is larger, even if therefore pressure reduction is very little, also a lot of heat radiation power consumptions can be caused, therefore, the embodiment of the present invention three also carries the larger backlight control circuit of a kind of heat radiation power dissipation ratio can avoiding causing due to each in backlight lamp string pressure reduction.
Increase by a voltage detecting circuit 5 in the embodiment of the present invention, be connected respectively with backlight 1 and control circuit 3, for detecting the pressure reduction of each lamp string in backlight, as shown in Figure 6.By voltage detecting circuit 5, detect the voltage of each lamp string in backlight 1, and whether the voltage of more each lamp string is identical, when voltage is different, output voltage processing signals is to control circuit 3; After control circuit 3 receives voltage processing signals, control driving circuit 2 and regulate current duty cycle, make the voltage of each lamp string identical, thus drop to minimum by the pressure reduction between each lamp string, the heat radiation power consumption reduced in circuit is fallen.
It should be noted that, by reducing the pressure reduction between each lamp string in the embodiment of the present invention, current-unbalance in each lamp string may be caused, the brightness disproportionation of backlight is weighed, therefore, needs again to control driving circuit 2 and regulate current duty cycle, regulate current effective value, balanced back light source brightness.
In the embodiment of the present invention, by increasing voltage detecting circuit in control circuit, detect the pressure reduction of each lamp string of backlight, regulation voltage, reduce pressure reduction, then control the size of electric current, not only reduce heat radiation power consumption, extend the serviceable life of IC, under situation allows, by regulating current duty cycle, the stable of current effective value can be ensured, thus stabilize the brightness of backlight.
Further, lamp number often a string in backlight is subject to the restriction of both end voltage, when a number of connecting is more, the voltage that voltage conversion circuit exports cannot meet the needs of lamp string, but the voltage that voltage conversion circuit exports crosses the decline that conference causes efficiency, in the embodiment of the present invention four, increase negative circuit 6, be connected with voltage conversion circuit 7 and backlight 1, inputed to backlight after the voltage inversion that voltage conversion circuit 7 is exported, as shown in Figure 7.
In the embodiment of the present invention, by a negater circuit 6, by the voltage inversion that voltage conversion circuit 7 exports, the pressure reduction of lamp string is made to become original 2 times like this, can to connect more lamp string, can reduce the use of the number of channels of backlight driver in driving circuit, a nearly step reduces the quantity of backlight driver, reduces use cost.
The embodiment of the present invention five additionally provides a kind of display panels, embodiment one to embodiment four relate to backlight control circuit, other parts form same as the prior art, do not repeat them here.
The embodiment of the present invention six additionally provides a kind of liquid crystal display, comprises the display panels that embodiment five relates to.
The display panels that the embodiment of the present invention five and embodiment six provide and liquid crystal display, backlight control circuit effectively can extend the serviceable life of product, and can make product under the environment exceeding regulation parameter, can flexibly according to actual conditions adjust operation parameter, improve the adaptive faculty of product condition to external world, reduce cost.
Obviously, those skilled in the art can carry out various change and modification to the present invention and not depart from the spirit and scope of the present invention.Like this, if these amendments of the present invention and modification belong within the scope of the claims in the present invention and equivalent technologies thereof, then the present invention is also intended to comprise these change and modification.
Claims (13)
1. a control method, for controlling the backlight control circuit of display panels, it is characterized in that, the method comprises:
Detected temperatures, and the Temperature numerical that will detect, compare with the threshold temperature preset, described in the threshold temperature that presets comprise high temperature threshold values and low temperature threshold values;
When the Temperature numerical detected is greater than described high temperature threshold values, export the processing signals reducing current effective value;
According to the processing signals of described reduction current effective value, control driving circuit and regulate backlight current dutycycle, reduce current effective value in the current effective value variation range of described low temperature threshold values coupling;
Judge whether exceed the brightness that human eye brightness sensation is corresponding by the back light source brightness that current effective value variation range that described low temperature threshold values mates is corresponding;
If exceed, then control described current effective value in the current effective value variation range of mating with described low temperature threshold values;
If do not exceed, then control in the current effective value variation range of the threshold temperature commensurate in scope that described current effective value defines at described high temperature threshold values and described low temperature threshold values.
2. the method for claim 1, is characterized in that, described detected temperatures comprises:
Detect the temperature temperature of display panels and described display panels setting electronic devices and components.
3. method as claimed in claim 2, it is characterized in that, the temperature that the current effective value that described high temperature threshold values is corresponding with described backlight high-high brightness mates is corresponding, the temperature that the current effective value that described low temperature threshold values is corresponding with the back light source brightness of setting mates is corresponding, and current effective value corresponding to the back light source brightness of described setting is lower than current effective value corresponding to described backlight high-high brightness.
4. the method for claim 1, is characterized in that, the method also comprises:
Detect the pressure reduction of each lamp string in backlight, and whether the voltage of more each lamp string is identical, when voltage is different, output voltage processing signals;
According to described voltage processing signals, control described driving circuit and regulate current duty cycle, the current effective value that each lamp string is exported is identical.
5. method as claimed in claim 4, it is characterized in that, the method also comprises:
Described backlight is inputed to after the voltage inversion that voltage conversion circuit in described backlight control circuit is exported.
6. the backlight control circuit of a display panels, comprise the driving circuit that is connected with backlight and the voltage conversion circuit to described backlight input voltage, it is characterized in that, also comprise: the control circuit be connected with described driving circuit, and the temperature sensing circuit to be connected with described control circuit, wherein
Described temperature sensing circuit, for detected temperatures, and the Temperature numerical that will detect, compare with the threshold temperature preset, described threshold temperature comprises high temperature threshold values and low temperature threshold values, when the Temperature numerical detected is greater than described high temperature threshold values, export the processing signals extremely described control circuit reducing current effective value;
Described control circuit, for the processing signals according to described reduction current effective value, control described driving circuit and regulate current duty cycle, reduce current effective value in the current effective value variation range of described low temperature threshold values coupling, when reducing after in current effective value to the current effective value variation range of described low temperature threshold values coupling, judge the back light source brightness that current effective value variation range that described low temperature threshold values mates is corresponding, whether exceed the brightness that the brightness sensation of human eye is corresponding, if exceed, then control described current effective value in the current effective value variation range of mating with described low temperature threshold values, if do not exceed, then control in the current effective value variation range of the threshold temperature commensurate in scope that described current effective value defines at described high temperature threshold values and described low temperature threshold values.
7. backlight control circuit as claimed in claim 6, it is characterized in that, described temperature sensing circuit specifically comprises: temperature sensor and single-chip microcomputer, wherein, described temperature sensor is connected with described single-chip microcomputer input pin by input bus, described single-chip microcomputer output pin is connected with described control circuit, concrete
Described temperature sensor, for detecting the temperature described display panels and described display panels setting electronic devices and components, and the Temperature numerical that will detect, export described single-chip microcomputer to;
Described single-chip microcomputer, for comparing the Temperature numerical received and the threshold temperature preset, according to comparative result output processing signal.
8. backlight control circuit as claimed in claim 6, it is characterized in that, the temperature that the current effective value that described high temperature threshold values is corresponding with backlight high-high brightness mates is corresponding, the temperature that the current effective value that described low temperature threshold values is corresponding with the back light source brightness of setting mates is corresponding, and current effective value corresponding to the back light source brightness of described setting is lower than current effective value corresponding to described backlight high-high brightness.
9. backlight control circuit as claimed in claim 7, it is characterized in that, the quantity of described temperature sensor is at least two, and is connected with described single-chip microcomputer input pin by same input bus.
10. backlight control circuit as claimed in claim 6, is characterized in that, also comprise: voltage detecting circuit, be connected respectively with described backlight and described control circuit, wherein,
Described voltage detecting circuit, detects the pressure reduction of each lamp string in described backlight, and whether the voltage of more each lamp string is identical, and when voltage is different, output voltage processing signals is to described control circuit;
Described control circuit also for, receive described voltage processing signals, control described driving circuit regulate current duty cycle, the current effective value that each lamp string is exported is identical.
11. backlight control circuits as claimed in claim 10, is characterized in that, also comprise negative circuit, be connected with described voltage conversion circuit and described backlight, wherein,
Described negative circuit, for the voltage exported by described voltage conversion circuit, inputs to described backlight after anti-phase.
12. 1 kinds of display panels, is characterized in that, comprise the backlight control circuit described in any one of claim 6-11.
13. 1 kinds of liquid crystal display, is characterized in that, comprise display panels according to claim 12.
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