CN105845091B - A kind of backlight drive circuit and terminal device - Google Patents
A kind of backlight drive circuit and terminal device Download PDFInfo
- Publication number
- CN105845091B CN105845091B CN201610402243.7A CN201610402243A CN105845091B CN 105845091 B CN105845091 B CN 105845091B CN 201610402243 A CN201610402243 A CN 201610402243A CN 105845091 B CN105845091 B CN 105845091B
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- drive circuit
- circuit
- transistor
- electric current
- flash
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Classifications
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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
-
- 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
- G09G3/36—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 using liquid crystals
Abstract
The present invention provides a kind of backlight drive circuit and terminal device, and the backlight drive circuit includes：Drive circuit and control circuit；The drive circuit, is connected with back light, for providing driving current to the back light by electric current output pin；The control circuit on one side is connected with the electric current output pin of the drive circuit, and the other end is connected with the processor of the terminal device；The control circuit is used for the enabling signal of the transient flash for receiving the processor triggering, and the output current of the electric current output pin of the drive circuit is instantaneously improved according to the enabling signal.The embodiment of the present invention controls the size of driving current by increasing control circuit on the peripheral circuit of backlight drive circuit, uses high current to drive back lit light pipe so that LCM screens can act as transient flash and play a part of flash lamp, and lifting is taken pictures effect.
Description
Technical field
The present invention relates to communication technical field, a kind of backlight drive circuit and terminal device are particularly related to.
Background technology
It is one of critical function of smart mobile phone to take pictures, in order to meet the demand of taking pictures under dark surrounds, some intelligent hands
Machine has been separately added into preposition flash lamp function, with the development of technology, is taken pictures light filling using LCM (liquid crystal display module) screen
Functional leaf be usually applied quickly.
When smart mobile phone adds preposition flash lamp, on the one hand can increase the cost of preposition flash lamp, on the other hand need
Increase the optical transmission window of flash lamp, the outward appearance of mobile phone is have impact on certain procedures.And it is same using LCM screen light fillings at this stage
Some problems are faced, because LCM screen backlights drive the limitation of IC (integrated circuit), it is impossible to realize that high current is glistened, cause
Brightness under dark surrounds by screen flash of light is inadequate, and the effect taken pictures is have impact on to a certain extent.
The content of the invention
It is an object of the invention to provide a kind of backlight drive circuit and terminal device, preposition sudden strain of a muscle in the prior art is solved
The offering question of light lamp.
In order to achieve the above object, the embodiment of the present invention provides a kind of backlight drive circuit, is applied to terminal device, described
Backlight drive circuit includes：Drive circuit and control circuit；
The drive circuit, is connected with back light, for providing drive to the back light by electric current output pin
Streaming current；
The control circuit on one side is connected with the electric current output pin of the drive circuit, the other end and the terminal device
Processor connection；The control circuit is used for the enabling signal of the transient flash for receiving the processor triggering, and according to described
Enabling signal instantaneously improves the output current of the electric current output pin of the drive circuit.
The embodiment of the present invention also provides a kind of terminal device, including：Backlight module, liquid crystal display panel, also including as above
Described backlight drive circuit.
Above-mentioned technical proposal of the invention at least has the advantages that：
In the backlight drive circuit and terminal device of the embodiment of the present invention, by the peripheral circuit of backlight drive circuit
Increase control circuit to control the size of driving current, use high current to drive back lit light pipe so that LCM screens can act as
Transient flash plays a part of flash lamp, lifts effect of taking pictures.
Brief description of the drawings
Fig. 1 represents the electrical block diagram of the backlight drive circuit that the first embodiment of the present invention is provided；
Fig. 2 represents that the circuit structure of the control circuit in the backlight drive circuit that the first embodiment of the present invention is provided is illustrated
Figure；
Fig. 3 represents the waveform diagram of the driving current of the backlight drive circuit that the first embodiment of the present invention is provided.
Specific embodiment
To make the technical problem to be solved in the present invention, technical scheme and advantage clearer, below in conjunction with accompanying drawing and tool
Body embodiment is described in detail.
First embodiment
As shown in figure 1, the first embodiment of the present invention provides a kind of backlight drive circuit, terminal device is applied to, it is described
Backlight drive circuit includes：Drive circuit 1 and control circuit 2；
The drive circuit 1, is connected with back light, for providing drive to the back light by electric current output pin
Streaming current；
Described control one end of circuit 2 is connected with the electric current output pin of the drive circuit, and the other end sets with the terminal
Standby processor connection；The control circuit is used for the enabling signal of the transient flash for receiving the processor triggering, and according to institute
State the output current that enabling signal instantaneously improves the electric current output pin RT of the drive circuit.
In the above embodiment of the present invention, increase by a control circuit 2 at the electric current output pin RT of backlight drive circuit,
When backlight drive circuit is used as normal display to be driven, control circuit 2 does not work, and the output current of electric current output pin RT is
Low current, the low current disclosure satisfy that the screen intensity regulatory demand of backlight PCM screens；When backlight drive electric current is used as instantaneously
During flash of light, control circuit 2 works, that is, control circuit 2 according to the enabling signal of transient flash, instantaneous to improve electric current output pin RT
Output current, now the output current of electric current output pin RT is high current, and this dozen of electric currents disclosure satisfy that the sudden strain of a muscle of moment of taking pictures
Light demand；Further, after transient flash terminates, control circuit 2 is stopped, then the output current of electric current output pin RT is extensive
The multiple low current for before adjustment.
Further, as shown in Figures 1 and 2, the control circuit 2 includes：First resistor R306, second resistance R307 with
And on-off circuit Q1；Wherein,
The electric current output pin RT of the drive circuit respectively with the first end of the first resistor R306 and described second
The first end connection of resistance R307, the second end ground connection of the first resistor R306, the second end string of the second resistance R307
It is grounded after joining the on-off circuit Q1；
The on-off circuit Q1 receives the enabling signal of the transient flash of the processor triggering, and the on-off circuit is closed
Close and cause that the first resistor and the second resistance are in parallel, then the output current of the electric current output pin RT of the drive circuit
It is instantaneous to improve.
In the above embodiment of the present invention, when not working, on-off circuit Q1 disconnects control circuit, then now drive circuit
The size of current-limiting resistance is the size of first resistor R306；When controlling circuit 2 to receive the enabling signal of transient flash, control electricity
Road 2 works, on-off circuit Q1 closures, then now the current-limiting resistance size of drive circuit is first resistor R306 parallel connection second resistances
The resistance size that R307 is obtained.When idle relative to control circuit, current-limiting resistance drop when control circuit works
It is low, so that the output current of electric current output pin RT will increase, such that it is able to reach the purpose of transient flash.
It should be noted that the resistance of the resistance of its specific first resistor R306 and second resistance R307 can be according to normal
Brightness demand and flash luminance demand set, and are not limited to an occurrence.
Specifically, as shown in Fig. 2 on-off circuit Q1 described in the above embodiment of the present invention includes：Bilateral diode
DIAC, diode D302 and transistor FET；Wherein,
Second end of the second resistance R307 is connected with the drain electrode of the transistor FET, the grid of the transistor FET
G is connected by the bilateral diode DIAC with the source S of the transistor FET, the source S of the transistor FET with it is described
The positive pole connection of diode D302, the negative pole of the diode D302 is connected with the drain D of the transistor FET, the crystal
The Substrate ground of pipe FET, the grid G of the transistor FET connects a control signal input BL_FLASH；
The on-off circuit Q1 receives the enabling signal of the transient flash of the processor triggering, increases the control letter
The input voltage of number input BL_FLASH, source S and the drain D conducting of the transistor, the on-off circuit closure, then institute
The output current for stating the electric current output pin RT of drive circuit 1 is instantaneously improved.
In specific embodiment of the invention, by the use of transistor FET as on-off circuit, and it is input into by increasing control signal
The input voltage of end BL_FLASH carrys out the source S and drain D conducting (i.e. on-off circuit closure) of controlling transistor, then electric current output
The output current of pin RT is instantaneously improved, so as to reach the purpose of transient flash.Under normal state, the source S of transistor and
Drain D is not turned on, i.e., on-off circuit disconnects, then the output current of electric current output pin RT is low current, so as to reach screen
Normal brightness is adjusted.
Further, the input voltage of the control signal input BL_FLASH is at least increased to more than or equal to institute
The conducting voltage and the forward conduction voltage more than or equal to the diode D302 for stating bilateral diode DIAC can make
Obtain source S and the drain D conducting of the transistor.
Wherein, bilateral diode DIAC is used to carry out overvoltage protection to control circuit 2.The RT pin of backlight circuit are used as control
Maximum current during flash of light.When driving is shown as normal backlight, it is ensured that FET pipes are closed, when as instantaneous sudden strain of a muscle
Light time then opens FET pipes, and BL_FLASH pins control the grid of FET pipes, by the voltage for drawing high BL_FLASH so that FET's
Source electrode is conducted with drain electrode, so as to reach reduce RT pins under impedance purpose, RT pins impedance reduction it is synchroflash
Electric current will be increased, to realize that instantaneous high current is glistened.By the voltage pull-down of BL_FLASH at the end of flash of light, so as to exit sudden strain of a muscle
Optical mode, into normal backlight display pattern.It is illustrated in figure 3, the output current schematic diagram at RT pins.
Further, circuit 2 is controlled described in the above embodiment of the present invention also to be included：
Be connected to 3rd resistor R308 between the grid G of the transistor FET and the control signal BL_FLASH and
4th resistance R309；Wherein,
One end of the 3rd resistor R308 is connected with the grid G of the transistor FET, and the 3rd resistor R308's is another
One end is connected with the control signal BL_FLASH；
One end of the 4th resistance R309 is connected with the grid G of the transistor FET, and the 4th resistance R309's is another
One end is grounded.
3rd resistor R308 and the protective resistance that the 4th resistance R309 is the control circuit in the above embodiment of the present invention.
To sum up, the operation principle of the backlight drive circuit that the first embodiment of the present invention is provided is：Due to backlight drive electricity
Road acts on of both playing, and one is used as normal backlight shows, two are used as instantaneous photographic flashing function.Still further aspect,
Because the maximum flashing current of backlight circuit is determined by the resistance value of backlight circuit RT pin, the resistance value energy of RT pin is changed
The electric current of dynamic adjustment flash of light, and the purpose of increase flashing current is got during FET openings equivalent to the impedance value for reducing RT pin, and
Function when FET is closed equivalent to the impedance value for increasing RT pin to maintain normal backlight circuit to be shown as backlight.
Second embodiment
In order to more preferably realize above-mentioned purpose, the second embodiment of the present invention provides a kind of terminal device, including：Backlight mould
Group, liquid crystal display panel, it is characterised in that also including backlight drive circuit as described above.
In the second embodiment of the present invention, by increasing control circuit on the basis of existing backlight circuit, liquid is realized
The demand of transient high-current flash of light when LCD panel glistens, it is ensured that the effect of taking pictures under dark surrounds, while in turn ensure that
Dimming effect when the normal backlight of liquid crystal display panel shows is unaffected.
Specifically, the backlight drive circuit transient flash that is triggered according to the processor of the terminal device for receiving is opened
Move signal instantaneously to improve the output current of the electric current output pin, the brightness of the liquid crystal display panel is instantaneously highlighted,
Realize transient flash.Further, after transient flash terminates, the output current of the electric current output pin of the backlight drive circuit
Recover to the output current before transient flash.
In the above embodiment of the present invention, increase by a control circuit at the electric current output pin of backlight drive circuit, when
When backlight drive circuit is used as normal display driving, control circuit does not work, and the output current of electric current output pin is small electricity
Stream, the low current disclosure satisfy that the brightness regulation demand of backlight liquid crystal display panel；When backlight drive electric current is used as instantaneous sudden strain of a muscle
Light time, control circuit work control circuit according to the enabling signal of transient flash, the instantaneous output for improving electric current output pin
Electric current, now the output current of electric current output pin is high current, and this dozen of electric currents disclosure satisfy that the flash of light demand of moment of taking pictures；Enter
One step, after transient flash terminates, control circuit is stopped, then before the output current of electric current output pin reverts to adjustment
Low current.
When the terminal provided using second embodiment of the invention is taken pictures under dark surrounds, its basic procedure is as follows：
User's selection is not provided with flash lamp, but is arranged at the camera of liquid crystal display panel side and is taken pictures；
User clicks on the moment of " shoot button ", and it is dark, it is necessary to light filling that the controller of terminal device detects current environment,
The enabling signal of transient flash is then sent to control circuit；
When control circuit receives the enabling signal of transient flash, the magnitude of voltage of control signal BL_FLASH is drawn high immediately,
FET pipes are opened, the output current of electric current output pin RT is instantaneously improved, then liquid crystal display panel realizes the instantaneous sudden strain of a muscle of high current
Light；
After transient flash terminates, control signal BL_FLASH recovers primary voltage value, closes FET pipes, electric current output pin RT
Output current recover normal value, then liquid crystal display panel realize that the backlight of low current shows.
Wherein, above-mentioned terminal device can be the various portable electronics such as all kinds of mobile terminals, panel computer, PC
Equipment.
It should be noted that the terminal device that the second embodiment of the present invention is provided is to include that above-mentioned first embodiment is provided
Backlight drive circuit terminal device, then all embodiments of above-mentioned backlight drive circuit be applied to the terminal device, and
Same or analogous beneficial effect can be reached.
Those of ordinary skill in the art it is to be appreciated that with reference to disclosed in the embodiment of the present invention embodiment description it is each
The unit and algorithm steps of example, can be realized with the combination of electronic hardware or computer software and electronic hardware.These
Function is performed with hardware or software mode actually, depending on the application-specific and design constraint of technical scheme.Specialty
Technical staff can realize described function to each specific application using distinct methods, but this realization should not
Think beyond the scope of this invention.
It is apparent to those skilled in the art that, for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, may be referred to the corresponding process in preceding method embodiment, will not be repeated here.
In embodiment provided herein, it should be understood that disclosed apparatus and method, can be by other
Mode is realized.For example, device embodiment described above is only schematical, for example, the division of the unit, is only
A kind of division of logic function, can there is other dividing mode when actually realizing, such as multiple units or component can combine or
Person is desirably integrated into another system, or some features can be ignored, or does not perform.Another, shown or discussed is mutual
Between coupling or direct-coupling or communication connection can be the INDIRECT COUPLING or communication link of device or unit by some interfaces
Connect, can be electrical, mechanical or other forms.
The unit that is illustrated as separating component can be or may not be it is physically separate, it is aobvious as unit
The part for showing can be or may not be physical location, you can with positioned at a place, or can also be distributed to multiple
On NE.Some or all of unit therein can be according to the actual needs selected to realize the mesh of this embodiment scheme
's.
In addition, during each functional unit in each embodiment of the invention can be integrated in a processing unit, it is also possible to
It is that unit is individually physically present, it is also possible to which two or more units are integrated in a unit.
If the function is to realize in the form of SFU software functional unit and as independent production marketing or when using, can be with
Storage is in a computer read/write memory medium.Based on such understanding, technical scheme is substantially in other words
The part contributed to prior art or the part of the technical scheme can be embodied in the form of software product, the meter
Calculation machine software product is stored in a storage medium, including some instructions are used to so that a computer equipment (can be individual
People's computer, server, or network equipment etc.) perform all or part of step of each embodiment methods described of the invention.
And foregoing storage medium includes：USB flash disk, mobile hard disk, ROM, RAM, magnetic disc or CD etc. are various can be with store program codes
Medium.
The above, specific embodiment only of the invention, but protection scope of the present invention is not limited thereto, and it is any
Those familiar with the art the invention discloses technical scope in, change or replacement can be readily occurred in, should all contain
Cover within protection scope of the present invention.Therefore, protection scope of the present invention should be defined by scope of the claims.
The above is the preferred embodiment of the present invention, it is noted that for those skilled in the art
For, on the premise of principle of the present invention is not departed from, some improvements and modifications can also be made, these improvements and modifications
Should be regarded as protection scope of the present invention.
Claims (6)
1. a kind of backlight drive circuit, is applied to terminal device, it is characterised in that the backlight drive circuit includes：Drive electricity
Road and control circuit；
The drive circuit, is connected with back light, and electricity is driven for being provided to the back light by electric current output pin
Stream；
The control circuit on one side is connected with the electric current output pin of the drive circuit, the place of the other end and the terminal device
Reason device connection；The control circuit is used for the enabling signal of the transient flash for receiving the processor triggering, and according to the startup
Signal transient improves the output current of the electric current output pin of the drive circuit；
Wherein, the control circuit includes：First resistor, second resistance and on-off circuit；Wherein,
The electric current output pin of the drive circuit is respectively with the first of the first end of the first resistor and the second resistance
End connection, the second end ground connection of the first resistor is grounded after the second end series connection on-off circuit of the second resistance；
The on-off circuit receives the enabling signal of the transient flash of the processor triggering, and the on-off circuit is closed and caused
The first resistor and the second resistance are in parallel；
Wherein, the on-off circuit includes：Bilateral diode, diode and transistor；Wherein,
Second end of the second resistance is connected with the drain electrode of the transistor, and the grid of the transistor passes through described two-way two
Pole pipe is connected with the source electrode of the transistor, and the source electrode of the transistor is connected with the positive pole of the diode, the diode
Negative pole be connected with the drain electrode of the transistor, the Substrate ground of the transistor, the grid of the transistor is also connected with a control
Signal input part processed；
The on-off circuit receives the enabling signal of the transient flash of the processor triggering, increases the control signal input
The input voltage at end, the source electrode of the transistor and drain electrode are turned on, the on-off circuit closure.
2. backlight drive circuit as claimed in claim 1, it is characterised in that the input voltage of the control signal input is extremely
The conducting voltage more than or equal to the bilateral diode and the positive guide more than or equal to the diode are increased to less
Be powered pressure.
3. backlight drive circuit as claimed in claim 2, it is characterised in that the control circuit also includes：
The 3rd resistor being connected between the grid of the transistor and the control signal input and the 4th resistance；Wherein,
One end of the 3rd resistor is connected with the grid of the transistor, and the other end of the 3rd resistor and the control are believed
The connection of number input；
One end of 4th resistance is connected with the grid of the transistor, the other end ground connection of the 4th resistance.
4. a kind of terminal device, including：Backlight module, liquid crystal display panel, it is characterised in that also including such as claim 1-3
Backlight drive circuit described in any one.
5. terminal device as claimed in claim 4, it is characterised in that the backlight drive circuit sets according to the terminal for receiving
The enabling signal of the transient flash of standby processor triggering instantaneously improves the output current of the electric current output pin, the liquid
The brightness of LCD panel is instantaneously highlighted, and realizes transient flash.
6. terminal device as claimed in claim 5, it is characterised in that after transient flash terminates, the backlight drive circuit
The output current of electric current output pin recovers the output current to before transient flash.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201610402243.7A CN105845091B (en) | 2016-06-08 | 2016-06-08 | A kind of backlight drive circuit and terminal device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610402243.7A CN105845091B (en) | 2016-06-08 | 2016-06-08 | A kind of backlight drive circuit and terminal device |
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| CN105845091B true CN105845091B (en) | 2017-06-23 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106373533A (en) * | 2016-11-23 | 2017-02-01 | 上海传英信息技术有限公司 | Backlight drive circuit and backlight drive current adjustment method |
| EP3537423A4 (en) * | 2016-12-09 | 2019-10-09 | Huawei Technologies Co., Ltd. | Mobile device, backlight control method thereof, and flash calibration method and apparatus thereof |
| CN108366452B (en) * | 2018-02-11 | 2019-11-26 | 清华四川能源互联网研究院 | A kind of LED drive circuit single wire control method, system and storage equipment |
| CN108490716A (en) * | 2018-03-21 | 2018-09-04 | 上海艾为电子技术股份有限公司 | A kind of screen light filling circuit and electronic equipment |
| CN112804790B (en) * | 2019-11-13 | 2023-03-24 | 圣邦微电子（北京）股份有限公司 | LED drive circuit and control circuit thereof |
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| CN201622822U (en) * | 2009-06-22 | 2010-11-03 | 比亚迪股份有限公司 | Backlight regulating circuit |
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| CN201622822U (en) * | 2009-06-22 | 2010-11-03 | 比亚迪股份有限公司 | Backlight regulating circuit |
| CN103220421A (en) * | 2013-04-03 | 2013-07-24 | 广东欧珀移动通信有限公司 | Method and device for using mobile terminal to carry out self photographing |
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| CN105845091A (en) | 2016-08-10 |
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