CN105096840A - Backlight driving circuit, backlight driving method and display device - Google Patents
Backlight driving circuit, backlight driving method and display device Download PDFInfo
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Abstract
The invention discloses a backlight driving circuit, a backlight driving method and a display device, and belongs to the field of display technologies. The backlight driving circuit comprises an AC/AC power supply module, a rectification module, n light-emitting diode (LED) light bars, a current sampling module, a constant-current control module and an isolated driving module, wherein the rectification module is electrically connected with the AC/AC power supply module, and is electrically connected with the positive electrode of each LED light bar; the current sampling module is electrically connected with the negative electrode of each LED light bar; and the input end of the constant-current control module is electrically connected with the output end of the current sampling module, the output end of the constant-current control module is electrically connected with the input end of the isolated driving module, and the output end of the isolated driving module is electrically connected with the AC/AC power supply module. According to the invention, problems that the structure of a driving circuit is complex, the driving efficiency is low, the power consumption of the driving circuit is great, and the cost is high are solved, and effects of simplifying the structure of the driving circuit, improving the driving efficiency, reducing the power consumption and reducing the cost are realized. The backlight driving circuit disclosed by the invention is applied to display devices.
Description
Technical field
The present invention relates to display technique field, particularly a kind of backlight drive circuit, backlight driving method and display device.
Background technology
In display technique field, liquid crystal display is (English: LiquidCrystalDisplay; Be called for short: LCD) panel itself cannot produce light source, LCD must utilize and be positioned at panel backlight generation brightness behind, demonstrates picture.Because light emitting diode is (English: LightEmittingDiode; Be called for short: the expressive ability that LED) can improve panel color, and compare environmental protection, therefore, most of LCD adopts LED as backlight.In order to reduce costs, the structure of LED backlight drive circuit needs simpler.
In correlation technique, first turn direct current by interchange (English: AlternatingCurrenttoDirectCurrent; Be called for short: AC/DC) ac voltage rectifier of 220v is become DC voltage by power module, again this DC voltage is supplied to LED backlight drive circuit, this LED backlight drive circuit as shown in Figure 1, comprise two electronic circuits, each electronic circuit controls a string LED lamp bar, each electronic circuit comprises supply module, current sampling module and constant-current control module, and wherein, the DC voltage that supply module is used for AC/DC power module exports converts LED lamp bar required voltage to; Current sampling module is used for carrying out sampling and analyzing to the electric current of LED lamp bar; The voltage that constant-current control module is used for supply module exports adjusts and controls, and realizes driving the constant current of LED lamp bar.One end ground connection of current sampling module, the N in Fig. 1 represents the model of LED.
Because above-mentioned LED backlight drive circuit needs to carry out drived control respectively to two string LED lamp bar, therefore, the structure of driving circuit is more complicated, and drive efficiency is lower, and the power consumption of driving circuit is comparatively large, and cost is higher.
Summary of the invention
In order to the structure solving driving circuit is more complicated, drive efficiency is lower, and the power consumption of driving circuit is comparatively large, and the problem that cost is higher, the invention provides a kind of backlight drive circuit, backlight driving method and display device.Described technical scheme is as follows:
First aspect, provide a kind of backlight drive circuit, described backlight drive circuit comprises: exchange and deliver stream AC/AC supply module, rectification module, a n LED lamp bar, current sampling module, constant-current control module and isolation drive module, described n is more than or equal to 2;
Described rectification module is electrically connected with described AC/AC supply module, be electrically connected respectively with the positive pole of each LED lamp bar in a described n LED lamp bar, the alternating voltage that described rectification module is used for described AC/AC supply module exports is converted to DC voltage, and described DC voltage is supplied to a described n LED lamp bar, one end ground connection of described rectification module;
Described current sampling module is electrically connected respectively with the negative pole of each LED lamp bar in a described n LED lamp bar, for carrying out sampling and analyzing to the current signal flowed through in a described n LED lamp bar, one end ground connection of described current sampling module;
The input end of described constant-current control module is electrically connected with the output terminal of described current sampling module, for carrying out current constant control to a described n LED lamp bar, the output terminal of described constant-current control module is electrically connected with the input end of described isolation drive module, the output terminal of described isolation drive module is electrically connected with described AC/AC supply module, the alternating voltage that described isolation drive module exports for controlling described AC/AC supply module.
Optionally, described rectification module comprises n commutation diode group, the corresponding LED lamp bar of each described commutation diode group, alternating voltage for being exported by described AC/AC supply module is converted to DC voltage, and described DC voltage is supplied to corresponding LED lamp bar, each described commutation diode group comprises m commutation diode, and described m is more than or equal to 2.
Optionally, described isolation drive module is isolating transformer.
Optionally, described AC/AC supply module comprises the arbitrary circuit in full-bridge circuit, half-bridge circuit and resonance change-over circuit.
Optionally, described rectification module also comprises commutation capacitor, and one end of described commutation capacitor is electrically connected with described AC/AC supply module, and the other end is electrically connected with described commutation diode.
Optionally, a described n LED lamp bar comprises two LED lamp bar, and each LED lamp bar comprises two LED;
Described rectification module comprises and described two LED lamp bar two commutation diode groups one to one, each described commutation diode group comprises two commutation diodes, the plus earth of a commutation diode in described two commutation diodes, the positive pole of negative pole and another commutation diode, described AC/AC supply module is electrically connected respectively, the negative pole of another commutation diode described is electrically connected with the positive pole of the LED of in corresponding LED lamp bar, the negative pole of a described LED is electrically connected with the positive pole of another LED described, the negative pole of another LED described is electrically connected with described current sampling module.
Second aspect, provides a kind of backlight driving method, and described method comprises:
Deliver stream AC/AC supply module by interchange and alternating voltage is converted to alternating voltage;
The alternating voltage of described AC/AC supply module output is controlled by isolation drive module;
By rectification module, the alternating voltage that described isolation drive module controls is converted to DC voltage, and described DC voltage is supplied to n LED lamp bar, described n is more than or equal to 2;
By current sampling module, sampling and analyzing is carried out to the current signal flowed through in a described n LED lamp bar, obtain sampled signal;
According to described sampled signal, by constant-current control module, current constant control is carried out to a described n LED lamp bar.
Optionally, described rectification module comprises n commutation diode group, the corresponding LED lamp bar of each described commutation diode group, and each described commutation diode group comprises m commutation diode, and described m is more than or equal to 2,
Describedly by rectification module, the alternating voltage that described isolation drive module controls is converted to DC voltage, and described DC voltage is supplied to n LED lamp bar, comprising:
By each described commutation diode group, the alternating voltage that described isolation drive module controls is converted to described DC voltage, and described DC voltage is supplied to each described LED lamp bar.
Optionally, described isolation drive module is isolating transformer,
The described alternating voltage being controlled the output of described AC/AC supply module by isolation drive module, being comprised:
The alternating voltage of described AC/AC supply module output is controlled by described isolating transformer.
Optionally, described AC/AC supply module comprises the arbitrary circuit in full-bridge circuit, half-bridge circuit and resonance change-over circuit,
Describedly deliver stream AC/AC supply module by interchange alternating voltage be converted to alternating voltage, comprising:
By the arbitrary circuit in described full-bridge circuit, described half-bridge circuit and described harmonic conversion circuit, alternating voltage is converted to alternating voltage.
The third aspect, provides a kind of display device, and described display device comprises the arbitrary described backlight drive circuit of first aspect.
The invention provides a kind of backlight drive circuit, backlight driving method and display device, the alternating voltage that can be exported by isolation drive module control AC/AC supply module, by rectification module, the alternating voltage that isolation drive module controls is converted to DC voltage, and DC voltage is supplied to n LED lamp bar, by current sampling module and constant-current control module, current constant control is carried out to n LED lamp bar, compared to correlation technique, simplify the structure of driving circuit, improve drive efficiency, reduce the power consumption of driving circuit, and reduce cost.
Should be understood that, it is only exemplary and explanatory that above general description and details hereinafter describe, and can not limit the present invention.
Accompanying drawing explanation
In order to be illustrated more clearly in the technical scheme in the embodiment of the present invention, below the accompanying drawing used required in describing embodiment is briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of a kind of LED backlight drive circuit in correlation technique;
Fig. 2 is the structural representation of a kind of LED backlight drive circuit that the embodiment of the present invention provides;
Fig. 3 is the structural representation of the another kind of LED backlight drive circuit that the embodiment of the present invention provides;
Fig. 4 is the schematic diagram of a kind of AC/AC supply module output AC voltage that the embodiment of the present invention provides;
Fig. 5 is the process flow diagram of a kind of backlight driving method that the embodiment of the present invention provides.
By above-mentioned accompanying drawing, illustrate the embodiment that the present invention is clear and definite more detailed description will be had hereinafter.These accompanying drawings and text description be not in order to limited by any mode the present invention design scope, but by reference to specific embodiment for those skilled in the art illustrate concept of the present invention.
Embodiment
For making the object, technical solutions and advantages of the present invention clearly, below in conjunction with accompanying drawing, embodiment of the present invention is described further in detail.
Embodiments provide a kind of backlight drive circuit, as shown in Figure 2, this backlight drive circuit comprises: exchange and deliver stream (English: AlternatingCurrenttoAlternatingCurrent; Be called for short: AC/AC) supply module 001, rectification module 002, a n LED lamp bar 003, current sampling module 004, constant-current control module 005 and isolation drive module 006, n are more than or equal to 2, and example, n equals 2.N in Fig. 2 represents the model of LED.
Wherein, rectification module 002 is electrically connected with AC/AC supply module 001, be electrically connected respectively with the positive pole of each LED lamp bar in n LED lamp bar 003, rectification module 002 is converted to DC voltage for the alternating voltage exported by AC/AC supply module 001, and DC voltage is supplied to n LED lamp bar 003, one end ground connection of rectification module 002.
Current sampling module 004 is electrically connected respectively with the negative pole of each LED lamp bar in n LED lamp bar 003, for carrying out sampling and analyzing to the current signal flowed through in n LED lamp bar 003, and one end ground connection of current sampling module 004.
The input end of constant-current control module 005 is electrically connected with the output terminal of current sampling module 004, for carrying out current constant control to n LED lamp bar 003, the output terminal of constant-current control module 005 is electrically connected with the input end of isolation drive module 006, the output terminal of isolation drive module 006 is electrically connected with AC/AC supply module 001, the alternating voltage that isolation drive module 006 exports for control AC/AC supply module 001.
In sum, the backlight drive circuit that the embodiment of the present invention provides, the alternating voltage that can be exported by isolation drive module control AC/AC supply module, by rectification module, the alternating voltage that isolation drive module controls is converted to DC voltage, and DC voltage is supplied to n LED lamp bar, by current sampling module and constant-current control module, current constant control is carried out to n LED lamp bar, compared to correlation technique, simplify the structure of driving circuit, improve drive efficiency, reduce the power consumption of driving circuit, and reduce cost.
As shown in Figure 3, rectification module 002 comprises n commutation diode group, the corresponding LED lamp bar of each commutation diode group, alternating voltage for being exported by AC/AC supply module 001 is converted to DC voltage, and DC voltage being supplied to corresponding LED lamp bar, each commutation diode group comprises m commutation diode, and m is more than or equal to 2, example, m equals 2.This backlight drive circuit realizes driving the constant current of LED lamp bar by commutation diode.
Isolated drive circuit can adopt isolating transformer to realize, and optionally, isolation drive module 006 can be isolating transformer, adopts isolating transformer, the isolation drive of realizing circuit, ensures the security performance of display device.
The alternating voltage that AC/AC supply module exports can pass through the circuit realiration such as full-bridge circuit, half-bridge circuit or harmonic conversion circuit, and optionally, AC/AC supply module comprises the arbitrary circuit in full-bridge circuit, half-bridge circuit and resonance change-over circuit.
As shown in Figure 3, rectification module 002 also comprises commutation capacitor 020, and one end of commutation capacitor 020 is electrically connected with AC/AC supply module 001, and the other end is electrically connected with commutation diode.
It should be noted that, in practical application, two LED lamp bar can meet the brightness requirement of LCD, and as shown in Figure 3, each LED lamp bar of two LED lamp bar 003 comprises two LED; Rectification module 002 comprises and two LED lamp bar, two commutation diode groups one to one, each commutation diode group comprises two commutation diodes, the plus earth of a commutation diode in two commutation diodes, positive pole, the AC/AC supply module of negative pole and another commutation diode are electrically connected respectively, the negative pole of another commutation diode is electrically connected with the positive pole of the LED of in corresponding LED lamp bar, the negative pole of a LED is electrically connected with the positive pole of another LED, and the negative pole of another LED is electrically connected with current sampling module.
Concrete, as shown in Figure 3, two LED lamp bar are the first LED lamp bar and the second LED lamp bar, first LED lamp bar comprises the first LED 0031 and the second LED 0032, second LED lamp bar comprises the 3rd LED 0033 and the 4th LED 0034, rectification module 002 comprises the first commutation diode group and the second commutation diode group, corresponding first LED of first commutation diode group, corresponding second LED of second commutation diode group, first commutation diode group comprises the first commutation diode 0021 and the second commutation diode 0022, second commutation diode group comprises the 3rd commutation diode 0023 and the 4th commutation diode 0024.
The plus earth of the first commutation diode 0021, the negative pole of the first commutation diode 0021 is electrically connected with the positive pole of the second commutation diode 0022, AC/AC supply module 001, the negative pole of the second commutation diode 0022 is electrically connected with the positive pole of the first LED 0031, the negative pole of the first LED 0031 is electrically connected with the positive pole of the second LED 0032, and the negative pole of the second LED 0032 is electrically connected with current sampling module 004.
The plus earth of the 3rd commutation diode 0023, the negative pole of the 3rd commutation diode 0023 is electrically connected with the positive pole of the 4th commutation diode 0024, one end of commutation capacitor 020, the negative pole of the 4th commutation diode 0024 is electrically connected with the positive pole of the 3rd LED 0033, the negative pole of the 3rd LED 0033 is electrically connected with the positive pole of the 4th LED 0034, and the negative pole of the 4th LED 0034 is electrically connected with current sampling module 004.
Fig. 4 shows the schematic diagram of AC/AC supply module output AC voltage (namely the voltage of alternation) in the backlight drive circuit that the embodiment of the present invention provides, as shown in Figure 4, longitudinal direction represents the size of alternating voltage, and Vo+ represents that the size of alternating voltage is Vo, and direction is just; Vo-represents that the size of alternating voltage is Vo, and direction is negative.Horizontal direction represents the time, and as shown in Figure 4, the size and Orientation intercropping cyclical variation at any time of the alternating voltage that AC/AC supply module exports, T represents one-period.
The backlight drive circuit that the embodiment of the present invention provides, constant-current control module is placed on secondary, by isolation drive module, drived control is carried out to elementary AC/AC supply module, by current sampling module and constant-current control module, current constant control is carried out at least two LED lamp bar, and pass through the alternating voltage of isolation drive module control AC/AC supply module output.This backlight drive circuit effectively can improve the efficiency that LED-backlit drives, reduce the power consumption of driving circuit, and significantly simplify the structure of driving circuit, the cost of the backlight drive circuit of display device can be reduced greatly, improve the competitive power of whole set of television.
In sum, the backlight drive circuit that the embodiment of the present invention provides, the alternating voltage that can be exported by isolation drive module control AC/AC supply module, by rectification module, the alternating voltage that isolation drive module controls is converted to DC voltage, and DC voltage is supplied to n LED lamp bar, by current sampling module and constant-current control module, current constant control is carried out to n LED lamp bar, compared to correlation technique, simplify the structure of driving circuit, improve drive efficiency, reduce the power consumption of driving circuit, and reduce cost.
Embodiments provide a kind of backlight driving method, as shown in Figure 5, the method comprises:
Step 501, by AC/AC supply module, alternating voltage is converted to alternating voltage.Perform step 502.
Step 502, the alternating voltage exported by isolation drive module control AC/AC supply module.Perform step 503.
Step 503, by rectification module, the alternating voltage that isolation drive module controls is converted to DC voltage, and DC voltage is supplied to n LED lamp bar, n is more than or equal to 2.Perform step 504.
Step 504, by current sampling module, sampling and analyzing is carried out to the current signal flowed through in n LED lamp bar, obtain sampled signal.Perform step 505.
Step 505, according to sampled signal, by constant-current control module, current constant control is carried out to n LED lamp bar.Perform step 501.
It should be noted that, the backlight driving method that the embodiment of the present invention provides is a kind of close-loop driven control method, therefore, this backlight driving method also can be described as: carry out sampling and analyzing by current sampling module to the current signal flowed through in n LED lamp bar, obtain sampled signal; According to sampled signal, make the alternating voltage that constant-current control module is exported by isolation drive module adjustment control AC/AC supply module, and then the DC voltage of adjustment rectification module, this DC voltage is the voltage be loaded in n LED lamp bar, eventually through the electric current of constant-current control module control flow check through n LED lamp bar, complete the current constant control to n LED lamp bar.
As shown in Figure 2, by AC/AC supply module 001, alternating voltage is converted to alternating voltage; By the alternating voltage that isolation drive module 006 control AC/AC supply module 001 exports; By rectification module 002, the alternating voltage that isolation drive module 006 controls is converted to DC voltage, and DC voltage is supplied to n LED lamp bar 003, n and is more than or equal to 2, example, n equals 2; By current sampling module 004, sampling and analyzing is carried out to the current signal flowed through in n LED lamp bar, obtain sampled signal; According to sampled signal, carry out current constant control by constant-current control module 005 pair of n LED lamp bar 003.
As shown in Figure 3, rectification module 002 comprises n commutation diode group, and the corresponding LED lamp bar of each commutation diode group, each commutation diode group comprises m commutation diode, and m is more than or equal to 2.Example, m equals 2.Accordingly, step 503 comprises: by each commutation diode group, the alternating voltage that isolation drive module controls is converted to DC voltage, and DC voltage is supplied to each LED lamp bar.
As shown in Figure 3, isolation drive module 006 can be isolating transformer, and accordingly, step 502 can comprise: the alternating voltage exported by isolating transformer control AC/AC supply module.
Optionally, AC/AC supply module 001 comprises the arbitrary circuit in full-bridge circuit, half-bridge circuit and resonance change-over circuit, accordingly, step 501 comprises: by the arbitrary circuit in full-bridge circuit, half-bridge circuit and resonance change-over circuit, alternating voltage is converted to alternating voltage.
In sum, the backlight driving method that the embodiment of the present invention provides, the alternating voltage that can be exported by isolation drive module control AC/AC supply module, by rectification module, the alternating voltage that isolation drive module controls is converted to DC voltage, and DC voltage is supplied to n LED lamp bar, by current sampling module and constant-current control module, current constant control is carried out to n LED lamp bar, compared to correlation technique, simplify the structure of driving circuit, improve drive efficiency, reduce the power consumption of driving circuit, and reduce cost.
Embodiments provide a kind of display device, this display device can comprise the backlight drive circuit shown in Fig. 2 or Fig. 3.This display device comprises liquid crystal panel, LCD TV, mobile phone, panel computer, navigating instrument etc.Backlight drive circuit in the embodiment of the present invention, the alternating voltage that can be exported by isolation drive module control AC/AC supply module, by rectification module, the alternating voltage that isolation drive module controls is converted to DC voltage, and DC voltage is supplied to n LED lamp bar, by current sampling module and constant-current control module, current constant control is carried out to n LED lamp bar, compared to correlation technique, simplify the structure of driving circuit, improve drive efficiency, reduce the power consumption of driving circuit, and reduce cost.
The foregoing is only preferred embodiment of the present invention, not in order to limit the present invention, within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (11)
1. a backlight drive circuit, it is characterized in that, described backlight drive circuit comprises: exchange and deliver stream AC/AC supply module, rectification module, a n LED lamp bar, current sampling module, constant-current control module and isolation drive module, described n is more than or equal to 2;
Described rectification module is electrically connected with described AC/AC supply module, be electrically connected respectively with the positive pole of each LED lamp bar in a described n LED lamp bar, the alternating voltage that described rectification module is used for described AC/AC supply module exports is converted to DC voltage, and described DC voltage is supplied to a described n LED lamp bar, one end ground connection of described rectification module;
Described current sampling module is electrically connected respectively with the negative pole of each LED lamp bar in a described n LED lamp bar, for carrying out sampling and analyzing to the current signal flowed through in a described n LED lamp bar, one end ground connection of described current sampling module;
The input end of described constant-current control module is electrically connected with the output terminal of described current sampling module, for carrying out current constant control to a described n LED lamp bar, the output terminal of described constant-current control module is electrically connected with the input end of described isolation drive module, the output terminal of described isolation drive module is electrically connected with described AC/AC supply module, the alternating voltage that described isolation drive module exports for controlling described AC/AC supply module.
2. backlight drive circuit according to claim 1, is characterized in that,
Described rectification module comprises n commutation diode group, the corresponding LED lamp bar of each described commutation diode group, alternating voltage for being exported by described AC/AC supply module is converted to DC voltage, and described DC voltage is supplied to corresponding LED lamp bar, each described commutation diode group comprises m commutation diode, and described m is more than or equal to 2.
3. backlight drive circuit according to claim 1, is characterized in that,
Described isolation drive module is isolating transformer.
4. backlight drive circuit according to claim 1, is characterized in that,
Described AC/AC supply module comprises the arbitrary circuit in full-bridge circuit, half-bridge circuit and resonance change-over circuit.
5. backlight drive circuit according to claim 2, is characterized in that,
Described rectification module also comprises commutation capacitor, and one end of described commutation capacitor is electrically connected with described AC/AC supply module, and the other end is electrically connected with described commutation diode.
6. backlight drive circuit according to claim 5, is characterized in that,
A described n LED lamp bar comprises two LED lamp bar, and each LED lamp bar comprises two LED;
Described rectification module comprises and described two LED lamp bar two commutation diode groups one to one, each described commutation diode group comprises two commutation diodes, the plus earth of a commutation diode in described two commutation diodes, the positive pole of negative pole and another commutation diode, described AC/AC supply module is electrically connected respectively, the negative pole of another commutation diode described is electrically connected with the positive pole of the LED of in corresponding LED lamp bar, the negative pole of a described LED is electrically connected with the positive pole of another LED described, the negative pole of another LED described is electrically connected with described current sampling module.
7. a backlight driving method, is characterized in that, described method comprises:
Deliver stream AC/AC supply module by interchange and alternating voltage is converted to alternating voltage;
The alternating voltage of described AC/AC supply module output is controlled by isolation drive module;
By rectification module, the alternating voltage that described isolation drive module controls is converted to DC voltage, and described DC voltage is supplied to n LED lamp bar, described n is more than or equal to 2;
By current sampling module, sampling and analyzing is carried out to the current signal flowed through in a described n LED lamp bar, obtain sampled signal;
According to described sampled signal, by constant-current control module, current constant control is carried out to a described n LED lamp bar.
8. method according to claim 7, is characterized in that, described rectification module comprises n commutation diode group, the corresponding LED lamp bar of each described commutation diode group, each described commutation diode group comprises m commutation diode, and described m is more than or equal to 2
Describedly by rectification module, the alternating voltage that described isolation drive module controls is converted to DC voltage, and described DC voltage is supplied to n LED lamp bar, comprising:
By each described commutation diode group, the alternating voltage that described isolation drive module controls is converted to described DC voltage, and described DC voltage is supplied to each described LED lamp bar.
9. method according to claim 7, is characterized in that, described isolation drive module is isolating transformer,
The described alternating voltage being controlled the output of described AC/AC supply module by isolation drive module, being comprised:
The alternating voltage of described AC/AC supply module output is controlled by described isolating transformer.
10. method according to claim 9, is characterized in that, described AC/AC supply module comprises the arbitrary circuit in full-bridge circuit, half-bridge circuit and resonance change-over circuit,
Describedly deliver stream AC/AC supply module by interchange alternating voltage be converted to alternating voltage, comprising:
By the arbitrary circuit in described full-bridge circuit, described half-bridge circuit and described harmonic conversion circuit, alternating voltage is converted to alternating voltage.
11. 1 kinds of display device, is characterized in that, described display device comprises the arbitrary described backlight drive circuit of claim 1 to 6.
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| CN108538259A (en) * | 2018-05-25 | 2018-09-14 | 京东方科技集团股份有限公司 | Backlight drive circuit, backlight driving method and display device |
| CN109671397A (en) * | 2019-02-15 | 2019-04-23 | 京东方科技集团股份有限公司 | Glow current control circuit, pixel circuit, display device and display driving method |
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Application publication date: 20151125 |