CN107240373A - Drive signal generation circuit, display device - Google Patents
Drive signal generation circuit, display device Download PDFInfo
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- CN107240373A CN107240373A CN201710651446.4A CN201710651446A CN107240373A CN 107240373 A CN107240373 A CN 107240373A CN 201710651446 A CN201710651446 A CN 201710651446A CN 107240373 A CN107240373 A CN 107240373A
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- signal generation
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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
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- General Physics & Mathematics (AREA)
- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
Abstract
This disclosure relates to which a kind of drive signal generation circuit and display device, are related to display technology field.The drive signal generation circuit includes：First charge pump, for receiving supply voltage and supply voltage being converted into the first driving voltage；First switching element, control end connects the first charge pump to receive the first driving voltage, and first end receives supply voltage；Booster circuit, connects the second end of first switching element, for receiving supply voltage and supply voltage being converted into reference voltage；Second charge pump, connects booster circuit, for receiving reference voltage and reference voltage being converted into the second driving voltage.The disclosure can automatically control the generation sequential of drive signal, so that evade the risk of start ghost, and circuit structure is simple, it is easy to accomplish.
Description
Technical field
This disclosure relates to display technology field, more particularly to a kind of drive signal generation circuit and display device.
Background technology
With the development of optical technology and semiconductor technology, with liquid crystal display (Liquid Crystal Display,
LCD) flat-panel monitor for representative has that frivolous, energy consumption is low, reaction speed is fast, excitation is good and the features such as high contrast,
Leading position is occupied in display field.
LCD is when realizing its display function, it is necessary to which drive circuit to provide accordingly for display panel with reference to specific sequential
Drive signal, wherein common drive signal include high level signal VGH and low level signal VGL.In the prior art, high electricity
Ordinary mail VGH and low level signal VGL are provided by DC-DC (direct current inversion of direct current) conversion electric power, and its sequential is by TCON
(Timer Control Register, time control register) is controlled.But it is high before TCON clock signal arrives
Level signal VGH signals can be exported to gate driving circuit so that pixel transistor is in non fully-closed state, so as to cause
There is the phenomenon of start ghost.
It should be noted that information is only used for strengthening the reason of background of this disclosure disclosed in above-mentioned background section
Solution, therefore can include not constituting the information to prior art known to persons of ordinary skill in the art.
The content of the invention
The purpose of the disclosure is to provide a kind of drive signal generation circuit and display device, and then at least in certain journey
One or more problem caused by limitation and the defect due to correlation technique is overcome on degree.
Other characteristics and advantage of the disclosure will be apparent from by following detailed description, or partially by the disclosure
Practice and acquistion.
According to an aspect of this disclosure there is provided a kind of drive signal generation circuit, including：
First charge pump, for receiving supply voltage and the supply voltage being converted into the first driving voltage；
First switching element, control end connects first charge pump to receive first driving voltage, the first termination
Receive the supply voltage；
Booster circuit, connects the second end of the first switching element, for receiving the supply voltage and by the electricity
Source voltage conversion is reference voltage；
Second charge pump, connects the booster circuit, for receiving the reference voltage and changing the reference voltage
For the second driving voltage.
In a kind of exemplary embodiment of the disclosure, first driving voltage is low level voltage, second driving
Voltage is high level voltage.
In a kind of exemplary embodiment of the disclosure, the first switching element is PNP transistor.
In a kind of exemplary embodiment of the disclosure, the drive signal generation circuit also includes：
Comparison module, connects the booster circuit and second charge pump, for by the reference voltage with it is described
Second driving voltage is compared and generates control voltage according to comparative result；
Second switch element, control end connects the comparison module to receive the control voltage, and first end receives described
The operating voltage of drive circuit, the second end ground connection.
In a kind of exemplary embodiment of the disclosure, the comparison module includes：
Comparator, the first receiving terminal receives the reference voltage, and the second receiving terminal receives second driving voltage, output
The control voltage that end output is generated according to comparative result.
In a kind of exemplary embodiment of the disclosure, the second switch element is NPN transistor；
When the control voltage is low level, the second switch element is closed, the operating voltage of the drive circuit
Remain predeterminated voltage；
When the control voltage is high level, the second switch element conductive, the operating voltage of the drive circuit
It is grounded and drags down.
It is described when second driving voltage is more than the reference voltage in a kind of exemplary embodiment of the disclosure
Control voltage is low level；
When second driving voltage is less than or equal to the reference voltage, the control voltage is high level.
In a kind of exemplary embodiment of the disclosure, the second switch element is PNP transistor；
When the control voltage is high level, the second switch element is closed, the operating voltage of the drive circuit
Remain predeterminated voltage；
When the control voltage is low level, the second switch element conductive, the operating voltage of the drive circuit
It is grounded and drags down.
It is described when second driving voltage is more than the reference voltage in a kind of exemplary embodiment of the disclosure
Control voltage is high level；
When second driving voltage is less than or equal to the reference voltage, the control voltage is low level.
According to an aspect of this disclosure, there is provided a kind of display device, including above-mentioned drive signal generation circuit.
Drive signal generation circuit and display device that disclosure illustrative embodiments are provided, first with the first electricity
Lotus pump generates the first driving voltage according to supply voltage, and so that supply voltage passes through boosting under the control of the first driving voltage
Circuit obtains reference voltage, recycles the second charge pump to generate the second driving voltage according to reference voltage.So, first drive
Dynamic voltage first is generated in the second driving voltage, then when the drive signal generation circuit can automatically control the generation of drive signal
Sequence；Further, before TCON clock signal arrives, gate driving circuit output is the first driving voltage, and this
One driving voltage can keep the closed mode of pixel transistor, so as to significantly evade the risk of start ghost,
And circuit structure is simple, it is easy to accomplish.
It should be appreciated that the general description of the above and detailed description hereinafter are only exemplary and explanatory, not
The disclosure can be limited.
Brief description of the drawings
Accompanying drawing herein is merged in specification and constitutes the part of this specification, shows the implementation for meeting the disclosure
Example, and be used to together with specification to explain the principle of the disclosure.It should be evident that drawings in the following description are only the disclosure
Some embodiments, for those of ordinary skill in the art, on the premise of not paying creative work, can also basis
These accompanying drawings obtain other accompanying drawings.
Fig. 1 schematically shows the structural representation of drive signal generation circuit in the embodiment of the present disclosure；
Fig. 2 schematically shows the signal timing diagram of drive signal generation circuit in the embodiment of the present disclosure.
Embodiment
Example embodiment is described more fully with referring now to accompanying drawing.However, example embodiment can be real in a variety of forms
Apply, and be not understood as limited to example set forth herein；On the contrary, these embodiments are provided so that the disclosure will more comprehensively and
Completely, and by the design of example embodiment those skilled in the art is comprehensively conveyed to.Described feature, structure or characteristic
It can combine in any suitable manner in one or more embodiments.There is provided many details in the following description
So as to provide fully understanding for embodiment of this disclosure.It will be appreciated, however, by one skilled in the art that the disclosure can be put into practice
Technical scheme and omit one or more in the specific detail, or can using other methods, constituent element, device,
Step etc..In other cases, known solution is not shown in detail or describes to avoid making each side of the disclosure from becoming mould
Paste.
To be easy to description, such as " in ... lower section ", " ... below ", the space of " bottom ", " in ... top ", " top " etc.
Relational terms, it is (or other available for an element as depicted or feature and another element or feature is described here
Element or feature) relation.It should be appreciated that the device that spatial relationship term is intended to including the use of in or in operation is removed shown in figure
Orientation outside different azimuth.If for example, the equipment in figure is reversed, being described as being located at other elements or feature
The element of " following " or " lower section " is by positioned at " top " of other elements or feature.Therefore, exemplary term " ... below " can
Including " in ... top " and " ... below " both orientation.Equipment can be positioned in addition and (be rotated by 90 degrees or other
Orientation), and correspondingly explain use here spatial relation description symbol.
Term used herein is not intended to the present invention just for the sake of describing the purpose of specific illustrative embodiment
Limitation.As used herein like that, singulative " one ", " described " and its variant are intended to also include plural form, remove
Non- context makes instruction expressly otherwise.It will be further understood that term " comprising " and/or "comprising" are in present specification
The presence of described feature, entirety, step, operation, element and/or part is specified when using, but be not excluded for it is more than one its
Its feature, entirety, step, operation, element, the presence or increase of part and/or combinations thereof.
In addition, accompanying drawing is only the schematic illustrations of the disclosure, it is not necessarily drawn to scale.The thickness of each layer in accompanying drawing
Do not reflect actual proportions with shape, be merely for convenience and purposes of illustration content of this disclosure.Identical reference represents identical in figure
Or similar part, thus repetition thereof will be omitted.Some block diagrams shown in accompanying drawing are functional entitys, are differed
Surely must be corresponding with physically or logically independent entity.It can realize these functional entitys using software form, or
Realize these functional entitys in one or more hardware modules or integrated circuit, or heterogeneous networks and/or processor device and/
Or these functional entitys are realized in microcontroller device.
This example embodiment provides a kind of drive signal generation circuit, for generating the first driving voltage V1 and second
Driving voltage V2.As shown in figure 1, the drive signal generation circuit can include：
First charge pump 10, for receiving supply voltage VDD and supply voltage VDD being converted into the first driving voltage V1；
First switching element Q1, control end connects the first charge pump 10 to receive the first driving voltage V1, and first end is received
Supply voltage VDD, the second end connection booster circuit 20, for respond the first driving voltage V1 with by supply voltage VDD transmit to
Booster circuit 20；
Booster circuit 20, for receiving supply voltage VDD and supply voltage VDD being converted into reference voltage AVDD；
Second charge pump 30, connects booster circuit 20, for receiving reference voltage AVDD and changing reference voltage AVDD
For the second driving voltage V2.
It should be noted that：First charge pump 10 and the second charge pump 30 can be condenser type energy storage charge pump, Huo Zheye
It can be inductance type energy storage charge pump；The booster circuit can be Boost circuit, or can also be other boosting electricity
Pressure, as long as the technique effect of the technical program can be reached, does not do for charge pump and the structure of booster circuit here
It is specific to limit.
The drive signal generation circuit that disclosure illustrative embodiments are provided, as shown in Fig. 2 first with the first electric charge
Pump 10 generates the first driving voltage V1 according to supply voltage VDD, and so that supply voltage under the first driving voltage V1 control
VDD obtains reference voltage AVDD by booster circuit 20, recycles the second charge pump 30 to generate second according to reference voltage AVDD
Driving voltage V2.So, the first driving voltage V1 is generated prior to the second driving voltage V2, then drive signal generation electricity
Road can automatically control the generation sequential of drive signal；Further, before TCON clock signal arrives, raster data model electricity
Road output is the first driving voltage V1, and first driving voltage V1 can keep the closed mode of pixel transistor, so that
The risk of start ghost can significantly be evaded, and circuit structure is simple, it is easy to accomplish.
In this example embodiment, if the transistor of pixel region is N-type transistor, the first driving voltage V1 can
It can be high level voltage VGH to think low level voltage VGL, the second driving voltage V2.
In the case, the first charge pump 10 can be used for generation low level voltage VGL, and it for example can be negative charge
Pump, the second charge pump 30 can be used for generation high level voltage VGH, and it for example can be positivity charge pump.
So, low level voltage VGL is generated prior to high level voltage VGH, is optimized compared to prior art
The sequential control method of drive circuit, while can also avoid the need for choosing suitable capacitor by verifying repeatedly, with up to
To the trouble of required voltage sequential；Further, if exception occurs in low level voltage VGL, first switching element Q1 just will not
Open, then the drive circuit can be also closed, so as to reduce the risk of display system failure.
On this basis, because first switching element Q1 responds the first driving voltage V1 and turns on, and the first driving voltage
V1 is again low level voltage VGL, therefore the first switching element Q1 can be PNP transistor.So, when first opens
The control end for closing element Q1 will be turned on when receiving the first driving voltage V1 of the first charge pump 10 generation, and by supply voltage
VDD is transmitted to booster circuit 20 to be boosted, so as to obtain reference voltage AVDD.
In this example embodiment, if the transistor of pixel region is P-type transistor, the first driving voltage V1 can
It can be low level voltage VGL to think high level voltage VGH, the second driving voltage V2.
In the case, the first charge pump 10 can be used for generation generation high level voltage VGH, and it can be for example positivity electricity
Lotus pump, the second charge pump 30 can be used for low level voltage VGL, and it for example can be negative charge pump.
So, high level voltage VGH is generated prior to low level voltage VGL, is optimized compared to prior art
The sequential control method of drive circuit, while can also avoid the need for choosing suitable capacitor by verifying repeatedly, with up to
To the trouble of required voltage sequential；Further, if exception occurs in high level voltage VGH, first switching element Q1 just will not
Open, then the drive circuit system can be also closed, so as to reduce the risk of display system failure.
On this basis, because first switching element Q1 responds the first driving voltage V1 and turns on, and the first driving voltage
V1 is again high level voltage VGH, therefore the first switching element Q1 can be NPN transistor.So, when first opens
The control end for closing element Q1 will be turned on when receiving the first driving voltage V1 of the first charge pump 10 generation, and by supply voltage
VDD is transmitted to booster circuit 20 to be boosted, so as to obtain reference voltage AVDD.
Based on said structure, with reference to shown in Fig. 1, the drive signal generation circuit can also include：
Comparison module 40, connects the charge pump 30 of booster circuit 20 and second, for reference voltage AVDD and second to be driven
Dynamic voltage V2 is compared and generates control voltage Vc according to comparative result；
Second switch element Q2, control end connects comparison module 40 to receive control voltage Vc, and first end receives driving electricity
The operating voltage Vo on road, the second end ground connection is electric will be driven when the second driving voltage V2 is abnormal for response control voltage Vc
The operating voltage Vo on road is connected to GND signals and is grounded.
It should be noted that：The operating voltage Vo of the drive circuit refers to the drive signal generation circuit in the present embodiment
Working power, it for example can be 1.8V operating voltage.
When the second driving voltage V2 is more than reference voltage AVDD, the second driving voltage V2 is normal, now the control electricity
Press Vc to can control second switch element Q2 to close；When the second driving voltage V2 is less than or equal to reference voltage AVDD, second drives
Dynamic voltage V2 is abnormal, and now the control voltage Vc can control second switch element Q2 conductings.
Based on this, the comparison module 40 is once judge that the second driving voltage V2 is abnormal, and will generate can turn on second switch
Element Q2 control voltage Vc, so that the operating voltage Vo ground connection of drive circuit, then the drive system will be closed with reality
Existing automatic protection functions, can so be avoided by the not enough display exception caused of driving, while display can also be prevented effectively
System and circuit components be damaged such as IC burn or liquid crystal polarization, the automatic Monitoring Design principle of the voltage it is simple and
It is with low cost.
In this example embodiment, the comparison module 40 can include：
Comparator, the first receiving terminal receives reference voltage AVDD, and the second receiving terminal receives the second driving voltage V2, output end
Export the control voltage Vc generated according to comparative result.
It should be noted that：When contrasting reference voltage AVDD and the second driving voltage V2 by comparator, it should also set
Corresponding peripheral circuit, is repeated no more here.
In addition, although the present embodiment is illustrated exemplified by comparing the second driving voltage V2 and reference voltage AVDD,
But the voltage monitoring system being made up of above-mentioned comparison module 40 such as comparator and controlling switch such as second switch element Q2
The monitoring object not limited to this of system, it can be also used for monitoring other driving voltages, is particularly suitable for use in uncontrollable or pole
Has the risk anticipation situation of possibility, by setting the voltage for needing to monitor, to realize the protective effect to system.
In one embodiment, the second switch element Q2 can be NPN transistor.
Wherein, when the second driving voltage V2 is more than reference voltage AVDD, the control voltage Vc of the comparator output is
Low level, then second switch element Q2 closings, now the operating voltage Vo of the drive circuit remains predeterminated voltage for example
1.8V。
Similarly, when the second driving voltage V2 is less than or equal to reference voltage AVDD, the control electricity of the comparator output
Pressure Vc is high level, then second switch element Q2 is turned on, and now the operating voltage Vo of the drive circuit, which is grounded, drags down, driving
System stalls.
It follows that the drive signal generating means that the present embodiment is provided carry voltage monitoring and defencive function,
Two driving voltage V2 can be automatically powered off when abnormal, so as to protect drive system.
In another embodiment, the second switch element Q2 can be PNP transistor.
Wherein, when the second driving voltage V2 is more than reference voltage AVDD, the control voltage Vc of the comparator output is
High level, then second switch element Q2 closings, the operating voltage Vo of the drive circuit remains predeterminated voltage such as 1.8V.
Similarly, when the second driving voltage V2 is less than or equal to reference voltage AVDD, the control electricity of the comparator output
Pressure Vc is low level, then second switch element Q2 is turned on, and now the operating voltage Vo of the drive circuit, which is grounded, drags down, driving
System stalls.
It follows that the drive signal generating means that the present embodiment is provided carry voltage monitoring and defencive function,
Two driving voltage V2 can be automatically powered off when abnormal, so as to protect drive system.
This example embodiment additionally provides a kind of display device, including above-mentioned drive signal generation circuit.The display
Device can automatically control the generation sequential of drive signal, so as to avoid ghost of starting shooting；It can also prevent what electric voltage exception from causing simultaneously
Driving is not enough, so as to avoid display abnormal, and protects drive system and display system against damages.
Wherein, the display device can be specifically LCD display device, OLED (Organic Light Emitting
Diode, Organic Light Emitting Diode) display device, PLED (Polymer Light-Emitting Diode, macromolecular LED two
Pole pipe) display device, PDP (Plasma Display Panel, Plasmia indicating panel) etc., here for the suitable of display device
With not doing specific limitation.
It should be noted that：Detail in the display device is entered in corresponding drive signal generation circuit
Detailed description is gone, has repeated no more here.
In this example embodiment, the display device can for example include mobile phone, tablet personal computer, television set, notes
Any product or part with display function such as this computer, DPF, navigator, the disclosure is to this without special limit
It is fixed.
Those skilled in the art will readily occur to its of the disclosure after considering specification and putting into practice invention disclosed herein
Its embodiment.The application is intended to any modification, purposes or the adaptations of the disclosure, these modifications, purposes or
Person's adaptations follow the general principle of the disclosure and including the undocumented common knowledge in the art of the disclosure
Or conventional techniques.Description and embodiments are considered only as exemplary, and the true scope of the disclosure and spirit are by appended
Claim is pointed out.
It should be appreciated that the precision architecture that the disclosure is not limited to be described above and is shown in the drawings, and
And various modifications and changes can be being carried out without departing from the scope.The scope of the present disclosure is only limited by appended claim.
Claims (10)
1. a kind of drive signal generation circuit, it is characterised in that including：
First charge pump, for receiving supply voltage and the supply voltage being converted into the first driving voltage；
First switching element, control end connects first charge pump to receive first driving voltage, and first end receives institute
State supply voltage；
Booster circuit, connects the second end of the first switching element, for receiving the supply voltage and by power supply electricity
Pressure is converted to reference voltage；
Second charge pump, connects the booster circuit, for receiving the reference voltage and the reference voltage being converted into the
Two driving voltages.
2. drive signal generation circuit according to claim 1, it is characterised in that first driving voltage is low level
Voltage, second driving voltage is high level voltage.
3. drive signal generation circuit according to claim 2, it is characterised in that the first switching element is positive-negative-positive
Transistor.
4. the drive signal generation circuit according to claim any one of 1-3, it is characterised in that the drive signal generation
Circuit also includes：
Comparison module, connects the booster circuit and second charge pump, for by the reference voltage and described second
Driving voltage is compared and generates control voltage according to comparative result；
Second switch element, control end connects the comparison module to receive the control voltage, and first end receives the driving
The operating voltage of circuit, the second end ground connection.
5. drive signal generation circuit according to claim 4, it is characterised in that the comparison module includes：
Comparator, the first receiving terminal receives the reference voltage, and the second receiving terminal receives second driving voltage, and output end is defeated
Go out the control voltage generated according to comparative result.
6. drive signal generation circuit according to claim 4, it is characterised in that the second switch element is NPN type
Transistor；
When the control voltage is low level, the second switch element is closed, and the operating voltage of the drive circuit is kept
For predeterminated voltage；
When the control voltage is high level, the second switch element conductive, the operating voltage of the drive circuit is connect
Ground is dragged down.
7. drive signal generation circuit according to claim 6, it is characterised in that be more than institute in second driving voltage
When stating reference voltage, the control voltage is low level；
When second driving voltage is less than or equal to the reference voltage, the control voltage is high level.
8. drive signal generation circuit according to claim 4, it is characterised in that the second switch element is positive-negative-positive
Transistor；
When the control voltage is high level, the second switch element is closed, and the operating voltage of the drive circuit is kept
For predeterminated voltage；
When the control voltage is low level, the second switch element conductive, the operating voltage of the drive circuit is connect
Ground is dragged down.
9. drive signal generation circuit according to claim 8, it is characterised in that be more than institute in second driving voltage
When stating reference voltage, the control voltage is high level；
When second driving voltage is less than or equal to the reference voltage, the control voltage is low level.
10. a kind of display device, it is characterised in that including the drive signal generation circuit described in claim any one of 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710651446.4A CN107240373B (en) | 2017-08-02 | 2017-08-02 | Drive signal generation circuit and display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710651446.4A CN107240373B (en) | 2017-08-02 | 2017-08-02 | Drive signal generation circuit and display device |
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| CN107240373A true CN107240373A (en) | 2017-10-10 |
| CN107240373B CN107240373B (en) | 2020-12-04 |
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| CN201710651446.4A Active CN107240373B (en) | 2017-08-02 | 2017-08-02 | Drive signal generation circuit and display device |
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| US10879797B2 (en) | 2019-05-13 | 2020-12-29 | Ememory Technology Inc. | Voltage booster circuit with ripple control and method controlling same |
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| Publication number | Publication date |
|---|---|
| CN107240373B (en) | 2020-12-04 |
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