CN105390097A - Backlight drive circuit and display screen - Google Patents
Backlight drive circuit and display screen Download PDFInfo
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- CN105390097A CN105390097A CN201510866827.5A CN201510866827A CN105390097A CN 105390097 A CN105390097 A CN 105390097A CN 201510866827 A CN201510866827 A CN 201510866827A CN 105390097 A CN105390097 A CN 105390097A
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- circuit
- voltage
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- driving chip
- backlight
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G3/00—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes
- G09G3/20—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters
- G09G3/34—Control arrangements or circuits, of interest only in connection with visual indicators other than cathode-ray tubes for presentation of an assembly of a number of characters, e.g. a page, by composing the assembly by combination of individual elements arranged in a matrix no fixed position being assigned to or needed to be assigned to the individual characters or partial characters by control of light from an independent source
- G09G3/3406—Control of illumination source
Abstract
An embodiment of the invention discloses a backlight drive circuit and a display screen. The backlight drive circuit comprises an input circuit for providing input voltage for a backlight drive chip; the backlight drive chip for converting the voltage inputted by the input circuit into preset voltage and outputting through an output circuit; the output circuit for receiving output voltage from the backlight drive circuit and outputting through a first voltage output end and a second voltage output end; a feedback circuit for enabling the backlight drive chip to adjust the output voltage of the backlight drive circuit based on feedback voltage; and a control circuit for controlling the on or off of the backlight drive chip. The embodiment of the invention can be used for stabilizing the output voltage of the backlight drive chip, and the conversion efficiency of the backlight drive chip is improved.
Description
Technical field
The present invention relates to circuit field, be specifically related to a kind of backlight drive circuit and display screen.
Background technology
Terminal device all be unable to do without display screen, display screen is the important component part of terminal device, and display screen operationally, the back light unit part utilizing display screen is needed to provide illumination to display screen, so, the back light unit of display screen plays very important effect for the display effect of display screen, especially along with the development of science and technology, more and more as the terminal such as mobile phone, panel computer all adopts large-size screen monitors to show, and during large-size screen monitors display, want display effect good, just higher to the requirement of the stable of display backlight and effect.
In prior art, the back light unit of terminal device light emitting diode (LED) display screen is generally provided by special backlight driving chip, so in use, especially when the voltage compare of the input end of backlight driving chip is low, often there is the problem that the backlight of shielding is flashed, have a strong impact on the experience of user, and at present in order to solve this problem, generally take the voltage improving backlight driving chip input end, and the method inherently can not solve the problem of backlight instability.
Summary of the invention
Embodiments provide a kind of backlight drive circuit and display screen, to stable backlight driving chip output voltage can be obtained.
Embodiment of the present invention first aspect provides a kind of backlight drive circuit, comprising:
Input circuit, backlight driving chip, output circuit, feedback circuit and control circuit;
Wherein, the input termination supply voltage of described input circuit, described input circuit is used for providing input voltage to described backlight driving chip;
First enable control pin of described backlight driving chip is connected with the output terminal of described input circuit, the power input pin of described backlight driving chip is connected with the feedback end of described feedback circuit, first output pin of described backlight driving chip is connected with the first input end of described output circuit, second output pin of described backlight driving chip is connected with the second input end of described output circuit, second enable control pin of described backlight drive circuit is connected with described control circuit, described backlight drive circuit is used for the voltage transitions that described input circuit inputs is become to predeterminated voltage and exported by described output circuit,
The feedback output end of described output circuit is connected with the input end of described feedback circuit, and described output circuit is for receiving the output voltage of described backlight drive circuit and being exported by the first voltage output end and the second voltage output end;
Described feedback circuit is used for, by the power input pin of the output voltage of described output circuit by described feedback end output feedack voltage extremely described backlight drive circuit, adjusting according to the output voltage of described feedback voltage to described backlight drive circuit to make described backlight driving chip;
Described control circuit is for controlling unlatching or the cut out of described backlight driving chip.
Embodiment of the present invention second aspect provides a kind of display screen, comprising:
Display unit, back light unit and the backlight drive circuit described in any one of claim 1 to 9;
Wherein, described back light unit is connected with described display unit, and described back light unit is used for providing screen display backlight for described display unit;
Described backlight drive circuit is connected with described back light unit, and described backlight drive circuit is used for providing driving voltage for described back light unit.
Can find out, the embodiment of the present invention by adding feedback circuit in backlight drive circuit, voltage Real-time Feedback backlight driving chip exported is to the input end of backlight driving chip, in time output voltage is adjusted according to this feedback voltage to make backlight driving chip, thus the output voltage stabilization of backlight driving chip can be made, improve the conversion efficiency of backlight driving chip.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is 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 the first embodiment of the backlight drive circuit that the embodiment of the present invention provides;
Fig. 2 is the structural representation of the feedback circuit that the embodiment of the present invention provides;
Fig. 3 is the structural representation of the input circuit that the embodiment of the present invention provides;
Fig. 4 is the structural representation of the output circuit that the embodiment of the present invention provides;
Fig. 5 is the structural representation of the second embodiment of the backlight drive circuit that the embodiment of the present invention provides;
Fig. 6 is the structural representation of the display screen that the embodiment of the present invention provides.
Embodiment
Embodiments provide a kind of backlight drive circuit and display screen, to stable backlight driving chip output voltage can be obtained.
The present invention program is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is the embodiment of a part of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, should belong to the scope of protection of the invention.
Term " first ", " second " and " the 3rd " etc. in instructions of the present invention and claims and above-mentioned accompanying drawing are for distinguishing different object, but not for describing particular order.In addition, term " comprises " and their any distortion, and intention is to cover not exclusive comprising.Such as contain the process of series of steps or unit, method, system, product or equipment and be not defined in the step or unit listed, but also comprise the step or unit do not listed alternatively, or also comprise alternatively for other intrinsic step of these processes, method, product or equipment or unit.
First be the structural representation of the first embodiment of the backlight drive circuit that the embodiment of the present invention provides see Fig. 1, Fig. 1.Wherein, as shown in Figure 1, the backlight drive circuit that first embodiment of the invention provides comprises:
Input circuit 1, backlight driving chip 2, output circuit 3, feedback circuit 4 and control circuit 5;
Wherein, the input termination supply voltage of described input circuit 1, the output terminal of described input circuit 1 is connected with the first enable control pin of described backlight driving chip 2, and described input circuit is used for providing input voltage to described backlight driving chip.
In embodiments of the present invention, the supply voltage of the input termination of input circuit 1 is the cell voltage VBAT of the terminals such as mobile phone.
Alternatively, in possible embodiments more of the present invention, the cell voltage of the terminals such as the mobile phone of the input termination of input circuit 1 is generally between 3.5V-4.3V.
The power input pin of described backlight driving chip 2 is connected with the feedback end of described feedback circuit 4, first output pin of described backlight driving chip 2 is connected with the first input end of described output circuit 3, second output pin of described backlight driving chip 2 is connected with the second input end of described output circuit 3, second enable control pin of described backlight drive circuit 2 is connected with described control circuit 5, and described backlight drive circuit 2 is become predeterminated voltage for the voltage transitions inputted described input circuit 1 and exported by described output circuit 3.
In embodiments of the present invention, this backlight driving chip 2 is the DC voltage conversion chip that always circulates, and the voltage needed for backlight is often high a lot of than the voltage (voltage of the also i.e. power input pin input of backlight driving chip 2) of battery, so backlight driving chip 2 one booster type voltage conversion chip, thus export again after the voltage that the power input pin of backlight driving chip 2 inputs can being boosted.Backlight driving chip 2 is a programmable chip, its output voltage can be arranged according to actual needs, as when carrying out LED to terminals such as mobile phones and powering, can arrange output voltage according to the quantity of LED, when the quantity of LED is more, can output voltage be set higher, such as, the voltage needed for each LED is 3.3V, if one has 6 LED, so the output voltage that can arrange backlight driving chip is 20V, so that the supply voltage of these 6 LED can be provided.
Alternatively, this backlight driving chip 2 can provide the voltage up to 40V to export.
Alternatively, the input voltage of this backlight driving chip 2 is generally between 2.7V-5.5V, namely also the voltage that provides of the power input pin of backlight driving chip 2, within the scope of this, can ensure that backlight driving chip normally works, therefore the cell voltage of the terminals such as mobile phone is enough powered to backlight driving chip.
Particularly, backlight driving chip 2 carries out switch control rule by the signal of its first enable control pin and the second enable control pin input to backlight drive signal, and the second output pin of backlight driving chip 2 is also an internal feedback pin.
The feedback output end of described output circuit 3 is connected with the input end of described feedback circuit 4, and described output circuit 3 is for receiving the output voltage of described backlight drive circuit 2 and being exported by the first voltage output end and the second voltage output end.
In embodiments of the present invention, the voltage after output circuit 3 receives backlight drive circuit 2 conversion is exported to LED by positive pole pin (LED+) and negative pole pin (LED-) and is powered.
Described feedback circuit 4 for by the output voltage of described output circuit 3 by described feedback end output feedack voltage to the power input pin of described backlight drive circuit 2, adjust according to the output voltage of described feedback voltage to described backlight drive circuit 2 to make described backlight driving chip 2.
In embodiments of the present invention, in order to ensure the output voltage stabilization of backlight drive circuit 2, by a feedback circuit 4, output voltage is fed back to input end, thus backlight drive circuit 2 re-starts adjustment according to the output voltage fed back to its output voltage, keep stable to make the output voltage of backlight drive circuit 2.
Particularly, the difference that backlight drive circuit 2 will calculate between the voltage of output circuit 3 reality output and pre-set output voltage, the actual output of backlight drive circuit 2 is readjusted according to this difference.Such as, pre-set output voltage is 20V, and actual output voltage is 19V, so calculate this difference 1V fewer than predeterminated voltage, therefore when again adjusting the output voltage of backlight drive circuit 2, can increase the output voltage of 1V on the basis of former output voltage, thus the output voltage of backlight drive circuit is stable.
Described control circuit 5 is for controlling unlatching or the cut out of described backlight driving chip 2.
Particularly, control circuit 5 controls unlatching or the cut out of backlight driving chip 2 by the second enable control pin of backlight driving chip 2.
Particularly, control circuit 5 controls unlatching or the cut out of backlight driving chip 2 by a pulse width modulating signal (PWM) signal.
In the first embodiment of the invention, when after circuit access VBAT, circuit is started working, backlight driving chip 2 is by the voltage required for exporting according to circuit requirements, and export this output voltage to LED by output circuit 3 and power to LED, when VBAT is too low or other reason causes output voltage unstable, such as, when output voltage is lower than required voltage, by this Voltage Feedback to backlight driving chip 2, backlight driving chip calculates this voltage difference, thus this voltage difference is increased again on the basis of former output voltage, output voltage is made to maintain required magnitude of voltage.Wherein, control circuit 5 is for controlling unlatching or the cut out of backlight driving chip 2.
The present invention by adding feedback circuit in backlight drive circuit, voltage Real-time Feedback backlight driving chip exported is to the input end of backlight driving chip, in time output voltage is adjusted according to this feedback voltage to make backlight driving chip, thus the output voltage stabilization of backlight driving chip can be made, improve the conversion efficiency of backlight driving chip.
For the ease of better understanding and implement the such scheme of the embodiment of the present invention, the application scenarios concrete below in conjunction with some is illustrated.
Refer to Fig. 2, Fig. 2 is the structural representation of the feedback circuit that the embodiment of the present invention provides.Wherein, as shown in Figure 2, the feedback circuit shown in Fig. 2 is the specific descriptions of the feedback circuit shown in Fig. 1, as shown in Figure 2:
Described feedback circuit 2 comprises:
First diode D1, filter capacitor C5 and the first resistance R1;
Wherein, the first end of described first diode D1 is connected with the first end of described filter capacitor C5, and be connected with the second input end of described backlight driving chip 2, second end of described first diode D1 is connected with second end of described filter capacitor C5, and be connected with the first end of described first resistance R1, second end of described first resistance R1 is connected with the feedback output end of described output circuit 3.
Particularly, the common node ground connection of second end of filter capacitor C5 and the second end of the first diode.
In embodiments of the present invention, the first diode D1 is a voltage stabilizing diode, for carrying out voltage stabilizing to the voltage fed back from output circuit 3, and inputs to backlight driving chip 2.
Preferably, the size of filter capacitor C5 is 0.5 microfarad.
Preferably, the resistance size of the first resistance R1 is 2 kilohms.
Particularly, after the input end of feedback circuit 4 receives feedback voltage, fed back to the power input pin of backlight drive circuit 2 by the first resistance R1, meanwhile, the first diode D1 and filter capacitor C5 is used for carrying out voltage stabilizing to this feedback voltage.
The output voltage stabilization of backlight driving chip 2 can be made by this feedback voltage in this bright embodiment.
Refer to Fig. 3, Fig. 3 is the structural representation of the input circuit that the embodiment of the present invention provides.Wherein, as shown in Figure 3, the feedback circuit shown in Fig. 3 is the specific descriptions of the input circuit shown in Fig. 1, as shown in Figure 3:
Described input circuit 1 comprises:
First electric capacity C1, the second electric capacity C2 and inductance L;
Wherein, the first end of the first end of described first electric capacity C1, the first end of described second electric capacity C2 and described inductance L connects, and connect supply voltage, second end of described first electric capacity C1 is connected with second end of described second electric capacity C2, and the second end of described inductance L is connected with the first enable control pin of described backlight driving chip 2.
In embodiments of the present invention, the first electric capacity C1 and the second electric capacity C2 is that input power VBAT plays filtering voltage regulation effect, and L1 is the energy storage inductor required for backlight driving chip, plays energy storage effect.
Preferably, the size of the first electric capacity C1 is 2.2 microfarads.
Preferably, the size of the second electric capacity C2 is 1 microfarad.
Preferably, the size of inductance L is 22 microhenrys.
The embodiment of the present invention can be by this output circuit 1 operating voltage that backlight driving chip provides more stable.
Refer to Fig. 4, Fig. 4 is the structural representation of the output circuit that the embodiment of the present invention provides.Wherein, as shown in Figure 4, the output circuit shown in Fig. 4 is the specific descriptions of the output circuit shown in Fig. 1, as shown in Figure 4:
Described output circuit 3 comprises:
3rd electric capacity C3, the 4th electric capacity C4 and the second resistance R2;
Wherein, the first end of described 3rd electric capacity C3 is connected with the first end of described 4th electric capacity C4, and be connected with described second end of the first resistance R1 and the first output pin of described backlight driving chip 2, the first end of described 4th electric capacity C4 is the first voltage output end of described output circuit 3, the first end of described second resistance R2 is connected with the second output pin of described backlight driving chip 2, and the second end of described second resistance is the second voltage output end of described output circuit 3.
In embodiments of the present invention, the out-put supply after the 3rd electric capacity C3 and the 4th electric capacity C4 changes backlight driving chip 2 plays filtering voltage regulation energy storage effect, and the second resistance R2 plays the effect of the output circuit size regulating backlight driving chip 2.
Preferably, the size of the 3rd electric capacity C3 is 1 microfarad.
Preferably, the size of the 4th electric capacity C4 is 100 millifarads.
Preferably, the size of the second resistance R2 is 15 ohm.
The embodiment of the present invention by this output circuit 3, backlight driving chip 2 is changed after voltage directly export to LED, to power to LED.
Refer to Fig. 5, Fig. 5 is the structural representation of the second embodiment of the backlight drive circuit that the embodiment of the present invention provides.Wherein, as shown in Figure 5, the backlight drive circuit shown in Fig. 5 is the specific descriptions of the backlight drive circuit shown in Fig. 1, as shown in Figure 5:
Wherein, the input circuit 1 in the backlight drive circuit shown in Fig. 5, output circuit 3 and feedback circuit 4 are identical with the input circuit shown in Fig. 2, Fig. 3 with Fig. 4, output circuit and feedback circuit respectively, do not repeat them here.
In addition, in embodiments of the present invention, described control circuit 5 comprises:
3rd resistance R3, the first end of described 3rd resistance is connected with the second enable control pin of described backlight driving chip, and incoming control signal, described second end of the 3rd resistance is connected with the ground pin of described backlight driving chip.
In embodiments of the present invention, the 3rd resistance R3 is the pull down resistor of the enable signal of backlight driving chip 2, plays the effect of stable level.
Preferably, the size of the 3rd resistance R3 is 47 ohm.
Control for the duty of the second enable control pin to backlight driving chip 2 by backlight driving chip 2 at the control circuit 5 of the embodiment of the present invention.
Preferably, the control signal of control circuit 5 is pulse width modulating signal (LCM-PWM).
Alternatively, in embodiments of the present invention, described voltage feedback circuit also comprises:
Second diode D2, the described positive pole of the second diode D2 is connected with the second end of described inductance L, and the negative pole of described second diode D2 is connected with the first end of the 3rd electric capacity C3.
In embodiments of the present invention, the second diode D2 plays afterflow effect to backlight driving chip 2, is a fly-wheel diode, and can play the path effect protecting and provide electric current.
Preferably, the model of the second diode D2 is WSB5819W-2/TR.
Particularly, backlight driving chip U2 is booster type voltage conversion chip.
Preferably, the model of backlight driving chip U2 is WD3119-6/TR.
In embodiments of the present invention, when after circuit access VBAT, circuit is started working, the first enable input pin (being also LX pin) of backlight driving chip U1 receives the electric energy of input circuit access, this electric energy, on the one hand for backlight driving chip U1 powers, can control the work of backlight driving chip U1 on the other hand; Output circuit 3 is received voltage that backlight driving chip 2 provides and is powered to LED by the first voltage output end (LED+) and the second voltage end (LED-) by this voltage, power to 6 LED if need altogether, then need the output voltage of 20V, thus backlight driving chip U1 should export 20V voltage.If spread of voltage, output voltage is 19V, thus this output voltage (19V) and the difference (1V) of pre-set output voltage (20V) are fed back to the power input pin (VIN) of backlight drive circuit U1 by feedback circuit 4, thus make backlight drive circuit, according to this difference, output voltage be increased 1V on original basis, required 20V is maintained to make output voltage, thus by which, ensure that the stable of output voltage.
The present invention by adding feedback circuit in backlight drive circuit, voltage Real-time Feedback backlight driving chip exported is to the input end of backlight driving chip, in time output voltage is adjusted according to this feedback voltage to make backlight driving chip, thus the output voltage stabilization of backlight driving chip can be made, improve the conversion efficiency of backlight driving chip.
See the structural representation that Fig. 6, Fig. 6 are the display screens that the embodiment of the present invention provides.Wherein, as shown in Figure 6:
This display screen 600 comprises:
Display unit 601, back light unit 602 and backlight drive circuit 603;
Wherein, described back light unit 602 is connected with described display unit 601, and described back light unit 602 is for providing screen display backlight for described display unit 601;
Described backlight drive circuit 603 is connected with described back light unit 602, and described backlight drive circuit 603 is for providing driving voltage for described back light unit 602.
Wherein, display unit 601 carries out LED display for the supply voltage receiving back light unit 601 and provide, and namely realizes screen display.
Wherein, backlight drive circuit 601 comprises:
Input circuit, backlight driving chip, output circuit, feedback circuit and control circuit;
Wherein, the input termination supply voltage of described input circuit, the output terminal of described input circuit is connected with first of described backlight driving chip the enable control pin, and described input circuit is used for providing input voltage to described backlight driving chip;
The power input pin of described backlight driving chip is connected with the feedback end of described feedback circuit, first output pin of described backlight driving chip is connected with the first input end of described output circuit, second output pin of described backlight driving chip is connected with the second input end of described output circuit, second enable control pin of described backlight drive circuit is connected with described control circuit, and described backlight drive circuit is used for the voltage transitions that described input circuit inputs is become to predeterminated voltage and exported by described output circuit;
The feedback output end of described output circuit is connected with the input end of described feedback circuit, and described output circuit is for receiving the output voltage of described backlight drive circuit and being exported by the first voltage output end and the second voltage output end;
Described feedback circuit is used for, by the power input pin of the output voltage of described output circuit by described feedback end output feedack voltage extremely described backlight drive circuit, adjusting according to the output voltage of described feedback voltage to described backlight drive circuit to make described backlight driving chip;
Described control circuit is for controlling unlatching or the cut out of described backlight driving chip.
Wherein, described feedback circuit comprises:
First diode, filter capacitor and the first resistance;
Wherein, the first end of described first diode is connected with the first end of described filter capacitor, and be connected with the second input end of described backlight driving chip, second end of described first diode is connected with the second end of described filter capacitor, and be connected with the first end of described first resistance, the second end of described first resistance is connected with the feedback output end of described output circuit.
Wherein, described input circuit comprises:
First electric capacity, the second electric capacity and inductance;
Wherein, the first end of the first end of described first electric capacity, the first end of described second electric capacity and described inductance connects, and connect supply voltage, second end of described first electric capacity is connected with the second end of described second electric capacity, and the second end of described inductance is connected with first of described backlight driving chip the enable control pin.
Wherein, described output circuit comprises:
3rd electric capacity, the 4th electric capacity and the second resistance;
Wherein, the first end of described 3rd electric capacity is connected with the first end of described 4th electric capacity, and be connected with the second end of described first resistance and the first output pin of described backlight driving chip, the first end of described 4th electric capacity is the first voltage output end of described output circuit, the first end of described second resistance is connected with the second output pin of described backlight driving chip, and the second end of described second resistance is the second voltage output end of described output circuit.
Wherein, described control circuit comprises:
3rd resistance, the first end of described 3rd resistance is connected with the second enable control pin of described backlight driving chip, and incoming control signal, described second end of the 3rd resistance is connected with the ground pin of described backlight driving chip.
Wherein, described control signal is pulse width modulating signal.
Wherein, described voltage feedback circuit also comprises:
Second diode, the positive pole of described second diode is connected with the second end of described inductance, and the negative pole of described second diode is connected with the first end of the 3rd electric capacity.
Wherein, described first diode is voltage stabilizing diode.
Wherein, described backlight driving chip is booster type voltage conversion chip.
It should be noted that, for aforesaid each embodiment of the method, in order to simple description, therefore it is all expressed as a series of combination of actions, but those skilled in the art should know, the present invention is not by the restriction of described sequence of movement, because according to the present invention, some step can adopt other orders or carry out simultaneously.Secondly, those skilled in the art also should know, the embodiment described in instructions all belongs to preferred embodiment, and involved action and module might not be that the present invention is necessary.
In the above-described embodiments, the description of each embodiment is all emphasized particularly on different fields, in certain embodiment, there is no the part described in detail, can see the associated description of other embodiments.
In several embodiments that the application provides, should be understood that, disclosed device, the mode by other realizes.Such as, device embodiment described above is only schematic, the such as division of described unit, be only a kind of logic function to divide, actual can have other dividing mode when realizing, such as multiple unit or assembly can in conjunction with or another system can be integrated into, or some features can be ignored, or do not perform.Another point, shown or discussed coupling each other or direct-coupling or communication connection can be by some interfaces, and the indirect coupling of device or unit or communication connection can be electrical or other form.
The described unit illustrated as separating component or can may not be and physically separates, and the parts as unit display can be or may not be physical location, namely can be positioned at a place, or also can be distributed in multiple network element.Some or all of unit wherein can be selected according to the actual needs to realize the object of the present embodiment scheme.
In addition, each functional unit in various embodiments of the present invention can be integrated in a processing unit, also can be that the independent physics of unit exists, also can two or more unit in a unit integrated.Above-mentioned integrated unit both can adopt the form of hardware to realize, and the form of SFU software functional unit also can be adopted to realize.
Step in embodiment of the present invention method can be carried out order according to actual needs and be adjusted, merges and delete.
Unit in embodiment of the present invention circuit can carry out merging, divide and deleting according to actual needs.
If described integrated unit using the form of SFU software functional unit realize and as independently production marketing or use time, can be stored in a computer read/write memory medium.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words or all or part of of this technical scheme can embody with the form of software product, this computer software product is stored in a storage medium, comprises all or part of step of some instructions in order to make a computer equipment (can be personal computer, server or the network equipment etc.) perform method described in each embodiment of the present invention.And aforesaid storage medium comprises: USB flash disk, ROM (read-only memory) (ROM, Read-OnlyMemory), random access memory (RAM, RandomAccessMemory), portable hard drive, magnetic disc or CD etc. various can be program code stored medium.
The above, above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit; Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the scope of various embodiments of the present invention technical scheme.
Claims (10)
1. a backlight drive circuit, is characterized in that, described backlight drive circuit comprises:
Input circuit, backlight driving chip, output circuit, feedback circuit and control circuit;
Wherein, the input termination supply voltage of described input circuit, the output terminal of described input circuit is connected with first of described backlight driving chip the enable control pin, and described input circuit is used for providing input voltage to described backlight driving chip;
The power input pin of described backlight driving chip is connected with the feedback end of described feedback circuit, first output pin of described backlight driving chip is connected with the first input end of described output circuit, second output pin of described backlight driving chip is connected with the second input end of described output circuit, second enable control pin of described backlight drive circuit is connected with described control circuit, and described backlight drive circuit is used for the voltage transitions that described input circuit inputs is become to predeterminated voltage and exported by described output circuit;
The feedback output end of described output circuit is connected with the input end of described feedback circuit, and described output circuit is for receiving the output voltage of described backlight drive circuit and being exported by the first voltage output end and the second voltage output end;
Described feedback circuit is used for, by the power input pin of the output voltage of described output circuit by described feedback end output feedack voltage extremely described backlight drive circuit, adjusting according to the output voltage of described feedback voltage to described backlight drive circuit to make described backlight driving chip;
Described control circuit is for controlling unlatching or the cut out of described backlight driving chip.
2. backlight drive circuit according to claim 1, is characterized in that, described feedback circuit comprises:
First diode, filter capacitor and the first resistance;
Wherein, the first end of described first diode is connected with the first end of described filter capacitor, and be connected with the second input end of described backlight driving chip, second end of described first diode is connected with the second end of described filter capacitor, and be connected with the first end of described first resistance, the second end of described first resistance is connected with the feedback output end of described output circuit.
3. backlight drive circuit according to claim 2, is characterized in that, described input circuit comprises:
First electric capacity, the second electric capacity and inductance;
Wherein, the first end of the first end of described first electric capacity, the first end of described second electric capacity and described inductance connects, and connect supply voltage, second end of described first electric capacity is connected with the second end of described second electric capacity, and the second end of described inductance is connected with first of described backlight driving chip the enable control pin.
4. backlight drive circuit according to claim 3, described output circuit comprises:
3rd electric capacity, the 4th electric capacity and the second resistance;
Wherein, the first end of described 3rd electric capacity is connected with the first end of described 4th electric capacity, and be connected with the second end of described first resistance and the first output pin of described backlight driving chip, the first end of described 4th electric capacity is the first voltage output end of described output circuit, the first end of described second resistance is connected with the second output pin of described backlight driving chip, and the second end of described second resistance is the second voltage output end of described output circuit.
5. backlight drive circuit according to claim 4, is characterized in that, described control circuit comprises:
3rd resistance, the first end of described 3rd resistance is connected with the second enable control pin of described backlight driving chip, and incoming control signal, described second end of the 3rd resistance is connected with the ground pin of described backlight driving chip.
6. backlight drive circuit according to claim 5, is characterized in that, described control signal is pulse width modulating signal.
7. backlight drive circuit according to claim 6, is characterized in that, described voltage feedback circuit also comprises:
Second diode, the positive pole of described second diode is connected with the second end of described inductance, and the negative pole of described second diode is connected with the first end of the 3rd electric capacity.
8. the backlight drive circuit according to any one of claim 1 to 7, is characterized in that, described first diode is voltage stabilizing diode.
9. the backlight drive circuit according to Claim 8 described in any one, is characterized in that, described backlight driving chip is booster type voltage conversion chip.
10. a display screen, is characterized in that, described display screen comprises:
Display unit, back light unit and the backlight drive circuit described in any one of claim 1 to 9;
Wherein, described back light unit is connected with described display unit, and described back light unit is used for providing screen display backlight for described display unit;
Described backlight drive circuit is connected with described back light unit, and described backlight drive circuit is used for providing driving voltage for described back light unit.
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| CN201510866827.5A CN105390097A (en) | 2015-12-01 | 2015-12-01 | Backlight drive circuit and display screen |
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| CN201510866827.5A CN105390097A (en) | 2015-12-01 | 2015-12-01 | Backlight drive circuit and display screen |
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| CN112397027A (en) * | 2020-12-11 | 2021-02-23 | 上海天马有机发光显示技术有限公司 | Driving module, voltage generation method thereof and display device |
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