CN206236402U - A kind of display drive circuit and electronic equipment - Google Patents
A kind of display drive circuit and electronic equipment Download PDFInfo
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- CN206236402U CN206236402U CN201621147042.9U CN201621147042U CN206236402U CN 206236402 U CN206236402 U CN 206236402U CN 201621147042 U CN201621147042 U CN 201621147042U CN 206236402 U CN206236402 U CN 206236402U
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Abstract
The utility model discloses a kind of display drive circuit and electronic equipment, and the circuit includes：Input branch road, boosting branch road and output branch road；The input branch road, for receiving input power signal, and will be transferred to the boosting branch road after the interference filtering of the input power signal；The boosting branch road, for receive mainboard transmission boosting Regulate signal, the partial pressure feedback signal of the output branch road, the input branch road input power signal；According to the boosting Regulate signal and the partial pressure feedback signal of the output branch road, boosting treatment is carried out to the input power signal；The output branch road, for by the boosting process after input power signal be filtered treatment after export, and by after filtering process after output signal carry out voltage division processing, feed back to the boosting branch road.The boosting Regulate signal that the technical solution of the utility model can send according to mainboard adjusts the size of output voltage, meets the actual demand of user, improves Consumer's Experience.
Description
Technical field
The utility model is related to drive circuit technical field, and in particular to a kind of display drive circuit and electronic equipment.
Background technology
Current OLED (Organic Light Emitting Display, organic light emitting diode display) display screen
Due to low in energy consumption, contrast it is high, it is flexible the advantages of, be widely used in it is extra high for power consumption requirements intelligence wearing kind equipment
In.The OLED display screen is made up of organic LED array, its brightness and driving voltage direct proportionality, drives
Voltage is higher, and screen intensity is higher, but power consumption is also bigger.In actual applications, ambient light is stronger, then screen intensity is bigger,
Otherwise user can not see the content of screen；If corresponding ambient light is weaker, screen intensity is lower, to reduce power consumption and prevent
Only user is dazzling.In the prior art, the OLED screen curtain driving voltage is generally higher, can reach 16V.For being powered using battery
Equipment, if using OLED screen curtain shown, need booster circuit drive OLED screen curtain.
However, in the design process of drive circuit of the OLED screen curtain is realized, inventor has found in the prior art extremely
It is few that there are the following problems：
Booster circuit output voltage in the drive circuit of the existing OLED screen curtain is usually fixed value, it is impossible to according to reality
The demand of border circuit carries out flexible modulation.
Utility model content
The utility model provides a kind of display drive circuit and electronic equipment, to solve the existing OLED screen curtain
Booster circuit output voltage in drive circuit is usually fixed value, it is impossible to which the demand according to side circuit carries out flexible modulation
Problem.
According to one side of the present utility model, there is provided a kind of display drive circuit, the circuit includes：Input branch
Road, boosting branch road and output branch road；
The input branch road, for receiving input power signal, and will pass after the interference filtering of the input power signal
It is defeated to the boosting branch road；
The boosting branch road, boosting Regulate signal, the partial pressure feedback letter of the output branch road for receiving mainboard transmission
Number, it is described input branch road input power signal；According to the boosting Regulate signal and the partial pressure feedback letter of the output branch road
Number, boosting treatment is carried out to the input power signal；
The output branch road, for by the boosting process after input power signal be filtered treatment after export, and
Output signal after processing after filtering is carried out into voltage division processing, the boosting branch road is fed back to.
According to another aspect of the present utility model, there is provided a kind of electronic equipment, the electronic equipment includes：Such as this practicality
New other side display drive circuit.
The beneficial effects of the utility model are：Display drive circuit of the present utility model and electronic equipment, by boosting
Boosting Regulate signal and the partial pressure feedback signal of the output branch road that branch road sends according to the mainboard, to the input electricity
Source signal carries out boosting treatment.First, display drive circuit of the present utility model can be by adjusting the boosting that mainboard sends
The partial pressure feedback signal of Regulate signal and the output branch road, realizes being adjusted flexibly for output voltage, such that it is able to meet not
With the demand of output voltage.Secondly, display drive circuit of the present utility model also passes through the input branch road to input power
Signal carries out interference filtering, so as to reduce the input signal interference in boosting branch road.In addition, display screen of the present utility model drives
Circuit is also filtered treatment by the output branch road to the output signal, reduces the interference of output signal, improves
Feedback signal precision after voltage division processing, so as to improve the output accuracy of display drive circuit of the present utility model.
Brief description of the drawings
Fig. 1 is a kind of structured flowchart of display drive circuit of the utility model one embodiment；
Fig. 2 is a kind of structured flowchart of display drive circuit of the utility model another embodiment；
Fig. 3 is a kind of circuit diagram of display drive circuit of the utility model one embodiment；
Fig. 4 is the structured flowchart of a kind of electronic equipment of the utility model one embodiment.
Specific embodiment
The drive circuit of existing OLED screen curtain needs to drive OLED screen curtain by booster circuit, and it is existing in booster circuit
Output voltage is usually fixed value.The fixed threshold voltage pair that the drive circuit of current OLED screen curtain can only be exported with booster circuit
OLED screen curtain is driven.
Design concept of the present utility model is：It is defeated for the booster circuit in the drive circuit of the existing OLED screen curtain
Go out voltage usually fixed value, it is impossible to which the demand according to side circuit carries out the problem of flexible modulation, the utility model boosting branch
Road can realize output electricity by the partial pressure feedback signal of the boosting Regulate signal and the output branch road that adjust mainboard transmission
That presses is adjusted flexibly, such that it is able to meet the demand of different output voltages.
Embodiment one
Fig. 1 is a kind of structured flowchart of display drive circuit of the utility model one embodiment, and referring to Fig. 1, this shows
Display screen drive circuit includes：Input branch road 11, boosting branch road 12 and output branch road 13；
The input branch road 11, for receiving input power signal, and by after the interference filtering of the input power signal
It is transferred to the boosting branch road 12；
The boosting branch road 12, the boosting Regulate signal for receiving mainboard transmission, the partial pressure feedback of the output branch road
Signal, the input power signal of the input branch road 11；According to the boosting Regulate signal and the partial pressure of the output branch road 13
Feedback signal, boosting treatment is carried out to the input power signal；
It is described output branch road 13, for by the boosting process after input power signal be filtered treatment after export,
And the output signal after processing after filtering is carried out into voltage division processing, feed back to the boosting branch road 12.
The beneficial effects of the utility model are：Display drive circuit of the present utility model, by the branch road that boosts according to institute
The boosting Regulate signal of mainboard transmission and the partial pressure feedback signal of the output branch road are stated, the input power signal is carried out
Boosting is processed.First, display drive circuit of the present utility model can by adjust mainboard send boosting Regulate signal with
And the partial pressure feedback signal of the output branch road, being adjusted flexibly for output voltage is realized, such that it is able to meet different output voltages
Demand.Secondly, display drive circuit of the present utility model is also done by the input branch road to input power signal
Disturb and filter, so as to reduce the input signal interference in boosting branch road.In addition, display drive circuit of the present utility model also passes through
The output branch road is filtered treatment to the output signal, the interference of output signal is reduced, after improve voltage division processing
Feedback signal precision, so as to improve the output accuracy of display drive circuit of the present utility model.
Embodiment two
Based on shown in above example one, Fig. 2 is a kind of display drive circuit of another embodiment of the utility model
Implement structured flowchart, referring to Fig. 2, the display drive circuit includes：Input branch road 11, boost branch road 12, output branch
Road 13 and discharge paths 14；
The input branch road 11, boosting branch road 12 is identical with embodiment one with the output function of branch road 13, and here is omitted.
The discharge paths 14, for receiving the control signal that the mainboard sends, according to the control signal, discharge institute
State the output charge after filtering process.
It should be noted that the output branch road 13 includes：Filter unit and feedback unit；The filter unit, is used for
Input power signal after the boosting is processed is filtered treatment, filters the interference signal in the output signal；It is described
Feedback unit, for the output signal after processing after filtering to be carried out into voltage division processing, and feeds back to the liter by voltage division signal
Pressure branch road.
The beneficial effects of the utility model are：Display drive circuit of the present utility model also add discharge paths, lead to
Crossing the discharge paths can be when boost chip stops output voltage, the electric charge that will rapidly be put aside on the output voltage terminal
Discharge, such that it is able to avoid because of the screen driving voltage power down time timing error for causing long, cause systemic-function abnormal or
Damage.
Embodiment three
Based on above example two, Fig. 3 is a kind of the specific of display drive circuit of the utility model one embodiment
Circuit diagram is realized, referring to Fig. 3, the display drive circuit includes：Input branch road 11, boost branch road 12, exports branch road 13 and puts
Electric branch road 14；
Wherein, the input branch road 11 includes：Input filter capacitor C1；
The input filter capacitor C1 mono- terminates the input power with the boosting branch road connection end, other end ground connection；
The feedback unit includes：First divider resistance R1 and the second divider resistance R2；The filter unit includes：Output
Filter capacitor C3；
The first divider resistance R1 and the second divider resistance R2 are connected in series, the first divider resistance R1 and second point
Piezoresistance R2 is connected in series the termination boosting branch road feedback end；Another termination output branch roads of first divider resistance R1
Output end；The second divider resistance R2 other ends ground connection；
The output filter capacitor C3 mono- terminates the output end of the output branch road, other end ground connection.
The output branch road 13 also includes：Feed-forward capacitance C4；
The feed-forward capacitance C4 mono- terminate it is described output branch road output end, another termination the first divider resistance R1 and
Second divider resistance R2 is connected in series end.
The boosting branch road includes：Boost chip U1, energy storage inductor L1, bootstrap capacitor C2 and set of frequency resistance R4；
The boost chip U1 inputs terminate described energy storage inductor L1 one end with the connection of Enable Pin；The energy storage inductor
The pin SW of another termination boost chip U1 of L1 and the bootstrap capacitor C2 connection ends；Another terminations of bootstrap capacitor C2
The bootstrapping pin of the boost chip U1；The pin FB of the boost chip U1 connects the first divider resistance R1 and the second partial pressure
Resistance R2 is connected in series end；The pin SCL of the boost chip U1, pin SDA connect the mainboard；
The switching frequency that the set of frequency resistance R4 mono- terminates the boost chip U1 sets pin, other end ground connection.
The discharge paths 14 include：First switch pipe Q1 and current-limiting resistance R3；
The current-limiting resistance R3 mono- terminates the output end of the output branch road, another termination first switch pipe Q1 leakages
Pole.
The first switch pipe Q1 source grounds, the first switch pipe Q1 grids connect the mainboard.
It should be noted that the boost chip can be with chip model as MP3309C.
Based on above example, the principle of technical solutions of the utility model is carried out specifically below by way of instantiation
It is bright；If the boost chip is MP3309C.By the utility model display drive circuit, can be sent by adjusting mainboard
Boosting Regulate signal and the output branch road partial pressure feedback signal, realize being adjusted flexibly for output voltage, highest output electricity
Pressure can reach 36V, to meet the demand that different use environments automatically adjust screen intensity.In addition, the utility model technology
Scheme also increases discharge paths, can avoid, because of the screen driving voltage power down time timing error for causing long, causing function different
Normal or damage.
As shown in figure 3, this circuit includes boost chip MP3309C, input filter capacitor C1, energy storage inductor L1, bootstrapping electricity
Hold C2, switching frequency sets resistance R4, feedback resistance R1 and R2, feed-forward capacitance C4, output filter capacitor C3, first switch pipe
Q1, discharge resistance R3.The first switch pipe Q1 can be electric discharge NMOS tube.
Wherein, the boost chip MP3309C major functions are that input supply voltage boost value is risen into setting voltage；Institute
The VIN pins of boost chip MP3309C, i.e. pin 2 are stated for voltage input pin；SDA pins, i.e. pin 1 are I2C protocol datas
Input and output pin, SCL pins, i.e. pin 10 are I2C agreement clock input pins, change described by pin SDA/SCL
The settable output voltage size of MP3309C internal registers, i.e., by the boosting Regulate signal of mainboard transmission to the pin
SDA/SCL, such that it is able to set the output voltage size of MP3309C；EN/PWM pins, i.e. pin 3 are used to enable chip；RFEQ
Pin, i.e. pin 4 are mainly used in setting the MP3309C chip switch frequency；GND pin, i.e. pin 6 are that chip power ground draws
Pin；SW is the drain electrode of chip internal low-sideMOSFET (low-pressure side MOS switch pipe), and BST pins, i.e. pin 9 are that bootstrapping is drawn
Pin, increases an electric capacity, for driving chip inside MOS switch pipe between SW and BST pins；VOUT pins, i.e. pin 8 are used
In output voltage；FB pins are output voltage feedback pin, are mainly used in the size that the MP3309C obtains output voltage.Institute
State the interference that filter capacitor C1 is used to filter in input power signal.The bootstrap capacitor C2 is used for driving chip internal switch pipe
MOSFET.The filter capacitor C3 is used to filter the interference on out-put supply.The feed-forward capacitance C4 is used to improve the dynamic of chip
State response speed.The energy storage inductor L1 is used to store electric energy, is the necessary component of boosting branch road.The set of frequency electricity
Resistance R4 is used to set the switching frequency of the MP3309C chips.The divider resistance R1 and R2 enters to the output voltage VO UT
After row partial pressure, the FB pins of the MP3309C chips are fed back to, the MP3309C chips get output voltage VO UT and set
The difference of definite value, and then size to output voltage adjusts.
The switching tube Q1 and current-limiting resistance R3 constitute discharge circuit；Wherein, the switching tube Q1 is N-channel switching tube
MOSFET；N-channel switching tube MOSFET is substitutable for PNP type triode, used as the switch of discharge path；The current-limiting resistance
R3 is used for current limliting, and electric current is excessive when preventing from discharging；It is main when needing to discharge the electric charge put aside on the output voltage VO UT
Sending signal controlling switch CONTROL is set to high level by plate, the electricity that will rapidly can be put aside on the output voltage VO UT
Lotus discharges.
For example：Technical solutions of the utility model can by the I2C interfaces of boost chip MP3309C, i.e. SDA pins and
, can be set in FB pin voltages VFB between 0~200mV by SCL pins, then the output voltage VO UT is as follows：
VOUT=VFB* (R1+R2)/R2
If：VFB=200mV
R1=800K
R2=10K
Then output voltage VO UT=16.2V
OLED screen curtain in addition to screen driving power supply, usual also digital circuit power source, to avoid causing damage or work(
Can be abnormal, when closing screen display, it is desirable to screen driving power supply must be first first reduced into 0, then turn off digital circuit power source.
To meet the timing requirements, it is to avoid voltage declines slow, this practicality caused by lacking discharge path because of the output voltage VO UT
The new discharge paths that increased the output voltage VO UT being made up of switching tube Q1 and current-limiting resistance R3.Under normality, mainboard will draw
Pin CONTROL is set to low level, and switching tube Q1 is not turned on, and the output voltage VO UT is normally exported.When the output need to be closed
During voltage VOUT, the MP3309C input voltage VINs are first turned off, pin CONTROL is then set to high level, switching tube
Q1 is turned on, then the output voltage VO UT can be rapidly pulled low into 0V.
Example IV
Fig. 4 is the structured flowchart of a kind of electronic equipment of the utility model one embodiment, referring to Fig. 4, the electronic equipment
40 include：Display drive circuit 41.The realization principle and the course of work of the display drive circuit 41 may refer to foregoing reality
The detailed description to display drive circuit in example one to embodiment three is applied, here is omitted.
The beneficial effects of the utility model are：Display drive circuit of the present utility model and electronic equipment, by boosting
Boosting Regulate signal and the partial pressure feedback signal of the output branch road that branch road sends according to the mainboard, to the input electricity
Source signal carries out boosting treatment.First, display drive circuit of the present utility model can be by adjusting the boosting that mainboard sends
The partial pressure feedback signal of Regulate signal and the output branch road, realizes being adjusted flexibly for output voltage, such that it is able to meet not
With the demand of output voltage.Secondly, display drive circuit of the present utility model also passes through the input branch road to input power
Signal carries out interference filtering, so as to reduce the input signal interference in boosting branch road.In addition, display screen of the present utility model drives
Circuit is also filtered treatment by the output branch road to the output signal, reduces the interference of output signal, improves
Feedback signal precision after voltage division processing, so as to improve the output accuracy of display drive circuit of the present utility model.Additionally, this
Discharge paths are also add in utility model technical scheme, output voltage can be stopped in boost chip by the discharge paths
When, rapidly the electric charge put aside on the output voltage terminal is discharged, during such that it is able to avoiding because of screen driving voltage power down
Between the timing error for causing long, cause systemic-function abnormal or damage.
Preferred embodiment of the present utility model is the foregoing is only, protection model of the present utility model is not intended to limit
Enclose.All any modification, equivalent substitution and improvements made within spirit of the present utility model and principle etc., are all contained in this reality
With in new protection domain.
Claims (10)
1. a kind of display drive circuit, it is characterised in that the circuit includes：Input branch road, boosting branch road and output branch road；
The input branch road, for receiving input power signal, and will be transferred to after the interference filtering of the input power signal
The boosting branch road；
The boosting branch road, boosting Regulate signal, the partial pressure feedback signal of the output branch road, institute for receiving mainboard transmission
State the input power signal of input branch road；It is right according to the boosting Regulate signal and the partial pressure feedback signal of the output branch road
The input power signal carries out boosting treatment；
The output branch road, for the boosting to be processed after input power signal be filtered treatment after export, and will be through
The output signal crossed after filtering process carries out voltage division processing, feeds back to the boosting branch road.
2. circuit according to claim 1, it is characterised in that the circuit also includes：Discharge paths；
The discharge paths, for receiving the control signal that the mainboard sends, according to the control signal, discharge the filtering
Output charge after treatment.
3. circuit according to claim 2, it is characterised in that the discharge paths include：First switch pipe Q1 and current limliting
Resistance R3；
The current-limiting resistance R3 mono- terminates the output end of the output branch road, another termination first switch pipe Q1 drain electrodes；
The first switch pipe Q1 source grounds, the first switch pipe Q1 grids connect the mainboard.
4. the circuit according to any one in claim 1-3, it is characterised in that the input branch road includes：Input filter
Ripple electric capacity C1；
The input filter capacitor C1 mono- terminates the input power with the boosting branch road connection end, other end ground connection.
5. circuit according to claim 4, it is characterised in that the output branch road includes：Filter unit and feedback unit；
The filter unit, treatment is filtered for the input power signal after the boosting is processed, and filters the output
Interference signal in signal；
The feedback unit, for the output signal after processing after filtering to be carried out into voltage division processing, and voltage division signal is fed back
To the boosting branch road.
6. circuit according to claim 5, it is characterised in that the feedback unit includes：First divider resistance R1 and
Two divider resistance R2；The filter unit includes：Output filter capacitor C3；
The first divider resistance R1 and the second divider resistance R2 are connected in series, and the first divider resistance R1 and the second partial pressure are electric
Resistance R2 is connected in series the termination boosting branch road feedback end；Another terminations of first divider resistance R1 are described to export the defeated of branch road
Go out end；The second divider resistance R2 other ends ground connection；
The output filter capacitor C3 mono- terminates the output end of the output branch road, other end ground connection.
7. circuit according to claim 6, it is characterised in that the output branch road also includes：Feed-forward capacitance C4；
The feed-forward capacitance C4 mono- terminates the output end of the output branch road, another termination the first divider resistance R1 and second
Divider resistance R2 is connected in series end.
8. circuit according to claim 7, it is characterised in that the boosting branch road includes：Boost chip U1, energy storage inductor
L1, bootstrap capacitor C2 and set of frequency resistance R4；
The boost chip U1 inputs terminate described energy storage inductor L1 one end with the connection of Enable Pin；The energy storage inductor L1 is another
The pin SW of the one termination boost chip U1 and the bootstrap capacitor C2 connection ends；Described in another terminations of bootstrap capacitor C2
The bootstrapping pin of boost chip U1；The pin FB of the boost chip U1 connects the first divider resistance R1 and the second divider resistance
R2 is connected in series end；The pin SCL and pin SDA of the boost chip U1 connect the mainboard；
The switching frequency that the set of frequency resistance R4 mono- terminates the boost chip U1 sets pin, other end ground connection.
9. circuit according to claim 8, it is characterised in that the model MP3309C of the boost chip.
10. a kind of electronic equipment, it is characterised in that the electronic equipment includes：Shown described in any one in claim 1 to 9
Screen drive circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621147042.9U CN206236402U (en) | 2016-10-21 | 2016-10-21 | A kind of display drive circuit and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621147042.9U CN206236402U (en) | 2016-10-21 | 2016-10-21 | A kind of display drive circuit and electronic equipment |
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| Publication Number | Publication Date |
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| CN206236402U true CN206236402U (en) | 2017-06-09 |
Family
ID=58982587
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| Application Number | Title | Priority Date | Filing Date |
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| CN201621147042.9U Active CN206236402U (en) | 2016-10-21 | 2016-10-21 | A kind of display drive circuit and electronic equipment |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106531059A (en) * | 2016-10-21 | 2017-03-22 | 歌尔科技有限公司 | Display screen drive circuit and electronic equipment |
-
2016
- 2016-10-21 CN CN201621147042.9U patent/CN206236402U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106531059A (en) * | 2016-10-21 | 2017-03-22 | 歌尔科技有限公司 | Display screen drive circuit and electronic equipment |
| CN106531059B (en) * | 2016-10-21 | 2023-11-24 | 歌尔科技有限公司 | Display screen driving circuit and electronic equipment |
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