CN108538267A - Driving circuit and liquid crystal display device - Google Patents
Driving circuit and liquid crystal display device Download PDFInfo
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- CN108538267A CN108538267A CN201810357528.2A CN201810357528A CN108538267A CN 108538267 A CN108538267 A CN 108538267A CN 201810357528 A CN201810357528 A CN 201810357528A CN 108538267 A CN108538267 A CN 108538267A
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- voltage
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- driving circuit
- module
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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
- G09G3/36—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
Disclose a kind of driving circuit and liquid crystal display device for driving display panel, display panel includes multiple pixel units, wherein driving circuit includes power management module, for providing the first supply voltage according to input voltage, and all reset signal is generated according to input voltage；Level switch module, for generating status signal and multiple gate drive signals according to second source voltage and channel data under the control of all reset signal；Second source tension discharge for the first supply voltage to be directly output as second source voltage when status signal is first state, and is extremely referred to ground voltage with reset level conversion module by reseting module when status signal is second electrical level state.It can reset and restart level switch module, prevent level switch module from being lockked and output abnormality by XON functions, to which liquid crystal display device can normally be shown when ensureing that input voltage restores.
Description
Technical field
The present invention relates to technical field of liquid crystal display, relate more specifically to a kind of driving circuit for driving display panel
And liquid crystal display device.
Background technology
Liquid crystal display (Liquid Crystal Display, LCD) is the orientation using liquid crystal molecule in electric field
Under the action of the phenomenon that changing change the display device of light source light transmittance.High-quality, small and work(is shown due to having
Low advantage is consumed, liquid crystal display has been widely used for the display terminal of such as mobile phone and the large scale of such as flat panel TV is aobvious
Show in panel.
Fig. 1 shows the structural schematic diagram of existing liquid crystal display device.
As shown in Figure 1, existing liquid crystal display device 100 includes display panel 110 and is provided for display panel 110 various
The printed circuit board 140 of working signal, display panel 110 and printed circuit board 140 are connected by flexible PCB 170.Display
Panel 110 includes gate driving circuit 130, source electrode drive circuit 120 and pel array (not shown).Pel array by
Multi-strip scanning line, multiple data lines and multiple pixel units positioned at crossover location are arranged to make up, and each pixel unit includes
The grid of thin film transistor (TFT) and pixel electrode, thin film transistor (TFT) is connected by grid line with gate driving circuit 130, and film is brilliant
The source electrode of body pipe is connected by source electrode line with source electrode drive circuit 120, and drain electrode is connected with pixel electrode.Gate driving circuit 130
For scanning a plurality of grid line in order so that the thin film transistor (TFT) of corresponding line is connected；Source electrode drive circuit 120 is used in film
Apply gray scale voltage corresponding with display data when transistor turns on the pixel electrode.
Power module 160 and level switch module 150 are integrated on printed circuit board 140, power module 160 is for providing
Supply voltage, level switch module 150 are connected with power module 160, for providing operation level for gate driving circuit 130.
In order to solve the problems, such as the power-off ghost shadow of liquid crystal display panel, the gate driving circuit 130 or level of the prior art
The XON pins for removing power-off ghost shadow are typically provided in conversion module 150.With the XON pins on level switch module 150
For, in normal display, the voltage that XON pins receive will not trigger XON mechanism on reference voltage；Work as liquid crystal display
When panel power is closed, XON pins detect the level less than reference voltage, the grid that will be provided to gate driving circuit 130
Voltage (negative pressure) to be closed to improve to gate turn-on voltage (positive pressure), the power supply due to being originally used for closing grid is elevated,
Gate driving circuit 130 can be fully open by all thin film transistor (TFT)s on the display panel 110 currently having been switched off, and will show
Positive and negative charge in panel is neutralized, so that pixel unit repid discharge, to achieve the purpose that eliminate ghost.
The liquid crystal display device 100 of the prior art has the following problems, the case where supply voltage rapid decrease restores again
Under, because supply voltage declines the XON functions of triggering level conversion module 150, when supply voltage restores, level switch module
150 are in locking state, cause voltage output abnormal, so that display picture is abnormal.
Invention content
In view of this, the purpose of the present invention is to provide a kind of driving circuits and liquid crystal for driving display panel
Showing device can restart level switch module in mains voltage variations, not influence the display picture of display.
A kind of driving circuit for driving display panel is provided according to an aspect of the present invention, and display panel includes multiple
Pixel unit, which is characterized in that driving circuit includes：Power management module, for providing the first power supply electricity according to input voltage
Pressure, and according to input voltage generate all reset signal, when and only input voltage be less than given threshold when all reset signal it is effective；Electricity
Flat conversion module, for generating status signal and more according to second source voltage and channel data under the control of all reset signal
A gate drive signal, when all reset invalidating signal, status signal is first state and multiple pixel units are multiple successively
Gate drive signal is opened, and when all reset signal is effective, status signal is the second state and multiple gate drive signals follow
Second source voltage；Reseting module, for the first supply voltage to be directly output as second when status signal is first state
Supply voltage, and second source tension discharge is extremely referred into ground voltage with reset level when status signal is second electrical level state
Conversion module.
Preferably, reseting module includes：Detection circuit is used for reception state signal, according to the level state of status signal
Control signal is provided；Reset circuit is series between power management module and level switch module, and control terminal receives control letter
Number, when control signal is effective, reset circuit by second source tension discharge to reference to ground voltage with reset level conversion module,
In, detection moding circuit is set as when status signal is second electrical level state, and control signal is effective.
Preferably, detection circuit includes comparator, and normal phase input end receives detection voltage, and inverting input is received with reference to electricity
Pressure, output end is connected with reseting module controls signal to provide, wherein comparator is set as being more than reference voltage when detection voltage
When, control signal is effective.
Preferably, detection module further includes bleeder circuit, for status signal being divided to obtain detection voltage,
Preferably, bleeder circuit includes the first resistor and second for being series at the first supply voltage and status signal receiving terminal
The intermediate node of resistance, first resistor and second resistance provides detection voltage.
Preferably, bleeder circuit includes voltage-stablizer, and voltage-stablizer is low-voltage differential linear voltage regulator.
Preferably, reset circuit includes：Switching tube, the first path terminal are connected with power management module, alternate path end with
Level switch module is connected, and control terminal is connected with the output end of comparator controls signal to receive；And pull down resistor, first end
Be connected with the alternate path end of switching tube, second end ground connection, wherein control signal it is effective when, switching tube shutdown, control signal without
When effect, switching tube conducting.
Preferably, reset circuit further includes：3rd resistor is series between the first path terminal of switching tube and control terminal；
4th resistance is series between the control terminal of switching tube and the output end of comparator.
Preferably, switching tube is p channel transistor.
A kind of liquid crystal display device is provided according to another aspect of the present invention, which is characterized in that including above-mentioned driving electricity
Road.
The advantageous effect of driving circuit and liquid crystal display device provided by the invention is：By using reseting module, defeated
When entering voltage and the XON functions of unstable triggering level conversion module occur, it can reset and restart level switch module, prevent level
Conversion module is lockked and output abnormality by XON functions, to which liquid crystal display device can normally be shown when ensureing that input voltage restores
Show.
Description of the drawings
By referring to the drawings to the description of the embodiment of the present invention, above-mentioned and other purposes of the invention, feature and
Advantage will be apparent from.
Fig. 1 shows the structural schematic diagram of existing liquid crystal display device.
Fig. 2 shows the structural schematic diagrams of the liquid crystal display device of the present invention.
Fig. 3 shows the structural schematic diagram of the driving circuit of Fig. 2.
Fig. 4 shows the work simulation schematic diagram of the reset circuit in Fig. 3.
Specific implementation mode
Hereinafter reference will be made to the drawings is more fully described the present invention.In various figures, identical element is using similar attached
Icon is remembered to indicate.For the sake of clarity, the various pieces in attached drawing are not necessarily to scale.In addition, may not show in figure
Go out certain well known parts.
Many specific details of the present invention, such as the structure of component, material, size, processing work is described hereinafter
Skill and technology, to be more clearly understood that the present invention.But it just as the skilled person will understand, can not press
The present invention is realized according to these specific details.
Fig. 2 shows the structural schematic diagrams of the liquid crystal display device of the present invention.
As shown in Fig. 2, the liquid crystal display device 200 of the present invention includes display panel 210 and is provided respectively for display panel 210
The printed circuit board 240 of kind working signal, display panel 210 and printed circuit board 240 are connected by flexible PCB 270.It is aobvious
Show that panel 210 includes driving circuit 230, source electrode drive circuit 220 and pel array (not shown).Pel array is by more
Scan line, multiple data lines and multiple pixel units positioned at crossover location are arranged to make up, and each pixel unit includes thin
The grid of film transistor and pixel electrode, thin film transistor (TFT) is connected by grid line with driving circuit 230, thin film transistor (TFT)
Source electrode is connected by source electrode line with source electrode drive circuit 220, and drain electrode is connected with pixel electrode.Driving circuit 230 is in order
Scan a plurality of grid line so that the thin film transistor (TFT) of corresponding line is connected；Source electrode drive circuit 220 is used to be connected in thin film transistor (TFT)
When apply corresponding with display data gray scale voltage on the pixel electrode.
Fig. 3 shows the structural schematic diagram of the driving circuit of Fig. 2.
As shown in figure 3, driving circuit 230 includes：Power management module 231, reseting module 232 and level conversion mould
Block 233.Power management module 231 is used to provide the first supply voltage VGH-P and all reset signal according to input voltage vin
XON, when input voltage vin is less than given threshold, all reset signal XON is effective.Level switch module 233 is used in all reset
Status signal VSQ and multiple gate drivings are generated according to second source voltage VGH-LS and channel data under the control of signal XON
Signal VG [1：n].When all reset signal VSQ is invalid, 233 output status signal VSQ of level switch module is first state
(such as output status signal VSQ is low level), while multiple pixel units are successively by multiple gate drive signal VG [1：N] it opens
It opens.When all reset signal XON is effective, 233 output status signal VSQ of level switch module is that the second state (such as exports shape
State signal VSQ is high level), multiple gate drive signal VG [1 at this time：N] follow second source voltage VGH-LS.Reset mould
Block 232 is connected between power management module 231 and level switch module 233, and reseting module 232 is used in status signal VSQ
It is second source voltage VGH-LS to export the first supply voltage VGH-P when first state.When status signal VSQ is second
When state, second source voltage VGH-LS is discharged to reference to ground voltage with replacement level conversion module 233 by reseting module 232,
So that when supply voltage restores, level switch module 233 can work normally, and not interfere with the aobvious of liquid crystal display device 200
Show quality.
Reset circuit 232 includes detection circuit 2321 and reset circuit 2322, and detection circuit 2321 is used for reception state
Signal VSQ provides control signal according to the level state of status signal VSQ.
Wherein, detection circuit 2321 includes comparator U1, and the inverting input of comparator U1 receives reference voltage Vref, just
Phase input terminal receives detection voltage, and comparator U1 is used to be provided to reset circuit 2322 according to detection voltage and reference voltage Vref
Control signal.Detection circuit 2321 further includes first resistor R1 and second resistance R2, and first resistor R1 and second resistance R2 are formed
Bleeder circuit, status signal VSQ by first resistor R1 and second resistance R2 partial pressures to obtain detection voltage, first resistor R1 and
The intermediate node of second resistance R2 generates detection voltage.
Certainly, in other embodiments of the invention, bleeder circuit is realized by voltage-stablizer, such as low-voltage differential is linearly steady
Depressor, trigger signal VSQ obtain detection voltage by low-voltage differential linear voltage regulator.Simultaneously the first supply voltage VGH-P be than
Operating voltage is provided compared with device U1.
Reset circuit 2322 includes the switching tube being series between power management module 231 and level switch module 233
The control terminal of Q1, switching tube Q1 are connected with the output end of comparator U1 controls signal, the first path terminal of switching tube Q1 to receive
The first supply voltage VGH-P is received, alternate path end is connected with level switch module 233 to be provided to level switch module 233
Second source voltage VGH-LS.Reset circuit 2322 further includes 3rd resistor R3 and the 4th resistance R4, and 3rd resistor R3 is series at
Between the first path terminal and control terminal of switching tube Q1, the first end of the 4th resistance R4 is connected with the control terminal of switching tube Q1, the
Two ends are connected with the output end of comparator U1.Reset circuit 2322 further includes pull down resistor R5, the first end of pull down resistor R5 with
The alternate path end of switching tube Q1 is connected, second end ground connection.
Wherein, triode or field-effect tube may be used to realize in switching tube Q1, system that the present invention is not limited thereto, this
The technical staff in field can select as the case may be.
In embodiments of the present invention, switching tube Q1 is, for example, p-type field-effect tube, referring to Fig. 3 to provided by the invention
The operation principle of reset circuit is described in detail.
When liquid crystal display device 200 works normally, power management module 231 for example exports the first power supply electricity of 18.2V
Press VGH-P, the voltage value for the status signal VSQ that level switch module 233 provides at this time is -7.5V, by first resistor R1 and
For second resistance R2 partial pressures to obtain the detection voltage of 2V or so, the inverting input of comparator U1 receives reference voltage Vref, ginseng
The voltage for examining voltage Vref is, for example, 3.3V, detects voltage at this time and is less than reference voltage Vref, the output end of comparator U1 provides
Control signal be low level, switching tube Q1 conducting, the first supply voltage VGH-P outputs are second source by reseting module 232
Voltage VGH-LS.
When input voltage vin declines or is unstable, when input voltage vin is less than given threshold, power management mould
Block 231, which generates all reset signal XON, status signal VSQ, becomes high level, detects voltage at this time and is more than reference voltage Vref, than
The control signal of offer compared with device U1 is high level, and switching tube Q1 is turned off, and pull down resistor R5 puts second source voltage VGH-LS
Electricity is to ground voltage is referred to, and at this moment level switch module 233 reverts to original state, at this time when input voltage vin is restored just again
Chang Shi, level switch module 233 can normally start, and ensure that liquid crystal display device 200 can restore normally to show.
Fig. 4 shows the work simulation schematic diagram of the reset circuit in Fig. 3.
As shown in figure 4, curve A indicates that the voltage change curve of input voltage vin, curve B indicate the first supply voltage
The voltage change curve of VGH-P and second source voltage VGH-LS, curve C indicate the voltage change curve of status signal VSQ.From
It can be seen from the figure that, when input voltage vin is gradually reduced, the first supply voltage VGH-P and second source voltage VGH-LS by
Decrescence small, when status signal VSQ becomes high level, the current potential of second source voltage VSQ reduces, it is possible thereby to reset reset electricity
Flat conversion module 233.
In conclusion the driving circuit and liquid crystal display device of the present invention go out by using reseting module in input voltage
When the XON functions of existing unstable triggering level conversion module, it can reset and restart level switch module, prevent level switch module
It is lockked and output abnormality by XON functions, to which liquid crystal display device can normally be shown when ensureing that input voltage restores.
It should be noted that herein, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also include other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
As described above according to the embodiment of the present invention, there is no all details of detailed descriptionthe for these embodiments, also not
Limit the specific embodiment that the invention is only described.Obviously, as described above, can make many modifications and variations.This explanation
These embodiments are chosen and specifically described to book, is in order to preferably explain the principle of the present invention and practical application, belonging to making
Technical field technical staff can utilize modification of the invention and on the basis of the present invention to use well.The present invention is only by right
The limitation of claim and its full scope and equivalent.
Claims (10)
1. a kind of driving circuit for driving display panel, the display panel includes multiple pixel units, which is characterized in that
The driving circuit includes：
Power management module for providing the first supply voltage according to input voltage, and generates entirely again according to the input voltage
Position signal, when and the only described input voltage be less than given threshold when all reset signal it is effective；
Level switch module, for generating shape according to second source voltage and channel data under the control of all reset signal
State signal and multiple gate drive signals, when all reset invalidating signal, the status signal is first state and described
Multiple pixel units are opened by the multiple gate drive signal successively, when all reset signal is effective, the state letter
Number follow the second source voltage for the second state and the multiple gate drive signal；
Reseting module, for first supply voltage to be directly output as described the when the status signal is first state
Two supply voltages, and the second source tension discharge is extremely referred into ground voltage when the status signal is second electrical level state
To reset the level switch module.
2. driving circuit according to claim 1, which is characterized in that the reseting module includes：
Detection circuit provides control signal for receiving the status signal according to the level state of the status signal；
Reset circuit is series between the power management module and the level switch module, and control terminal receives the control
When signal processed, the control signal are effective, the reset circuit by the second source tension discharge to reference to ground voltage with multiple
The position level switch module,
Wherein, the detection moding circuit is set as when the status signal is second electrical level state, and the control signal is effective.
3. driving circuit according to claim 2, which is characterized in that the detection circuit includes comparator, positive input
End receives detection voltage, and inverting input receives reference voltage, and output end is connected with the reseting module to provide the control
Signal,
Wherein, the comparator is set as when the detection voltage is more than the reference voltage, and the control signal is effective.
4. driving circuit according to claim 3, which is characterized in that the detection module further includes bleeder circuit, is used for
The status signal is divided to obtain the detection voltage.
5. driving circuit according to claim 4, which is characterized in that the bleeder circuit includes being series at first electricity
The first resistor and second resistance of source voltage and the status signal receiving terminal, in the first resistor and the second resistance
Intermediate node provides the detection voltage.
6. driving circuit according to claim 4, which is characterized in that the bleeder circuit includes voltage-stablizer, the voltage stabilizing
Device is low-voltage differential linear voltage regulator.
7. electric power management circuit according to claim 4, which is characterized in that the reset circuit includes：
Switching tube, the first path terminal are connected with the power management module, and alternate path end is connected with the level switch module,
Control terminal is connected with the output end of the comparator to receive the control signal；And
Pull down resistor, first end are connected with the alternate path end of the switching tube, second end ground connection,
Wherein, when the control signal is effective, switching tube shutdown, when the control invalidating signal, the switching tube is connected.
8. driving circuit according to claim 5, which is characterized in that the reset circuit further includes：
3rd resistor is series between the first path terminal of the switching tube and control terminal；
4th resistance is series between the control terminal of the switching tube and the output end of the comparator.
9. driving circuit according to claim 5, which is characterized in that the switching tube is p channel transistor.
10. a kind of liquid crystal display device, which is characterized in that including：
Claim 1 to 9 any one of them driving circuit.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810357528.2A CN108538267B (en) | 2018-04-20 | 2018-04-20 | Drive circuit and liquid crystal display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810357528.2A CN108538267B (en) | 2018-04-20 | 2018-04-20 | Drive circuit and liquid crystal display device |
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| CN108538267B CN108538267B (en) | 2020-08-04 |
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| CN110661408A (en) * | 2019-09-17 | 2020-01-07 | 昆山龙腾光电股份有限公司 | Discharge circuit, power supply and display device |
| CN111223453A (en) * | 2020-03-18 | 2020-06-02 | 京东方科技集团股份有限公司 | Power supply module and display device |
| TWI717965B (en) * | 2020-01-08 | 2021-02-01 | 敦泰電子股份有限公司 | Display module, display driver integrated circuit and restarting method for display driver integrated circuit when abnormal voltage occurs |
| CN113436587A (en) * | 2021-06-22 | 2021-09-24 | 昆山龙腾光电股份有限公司 | Regulating circuit |
| CN114242015A (en) * | 2021-12-17 | 2022-03-25 | 惠州视维新技术有限公司 | Control method of display panel circuit and display panel circuit |
| CN114724525A (en) * | 2022-05-16 | 2022-07-08 | 福州京东方光电科技有限公司 | Display device, panel driving circuit thereof and charge discharging method |
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| CN111223453A (en) * | 2020-03-18 | 2020-06-02 | 京东方科技集团股份有限公司 | Power supply module and display device |
| CN113436587A (en) * | 2021-06-22 | 2021-09-24 | 昆山龙腾光电股份有限公司 | Regulating circuit |
| CN114242015A (en) * | 2021-12-17 | 2022-03-25 | 惠州视维新技术有限公司 | Control method of display panel circuit and display panel circuit |
| CN114242015B (en) * | 2021-12-17 | 2023-01-20 | 惠州视维新技术有限公司 | Control method of display panel circuit and display panel circuit |
| CN114724525A (en) * | 2022-05-16 | 2022-07-08 | 福州京东方光电科技有限公司 | Display device, panel driving circuit thereof and charge discharging method |
| CN114724525B (en) * | 2022-05-16 | 2023-08-08 | 福州京东方光电科技有限公司 | Display device, panel driving circuit thereof and charge discharging method |
| WO2023221789A1 (en) * | 2022-05-16 | 2023-11-23 | 京东方科技集团股份有限公司 | Display apparatus, panel drive circuit thereof, and charge discharge method |
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Address after: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Applicant after: Kunshan Longteng Au Optronics Co Address before: 215301, 1, Longteng Road, Kunshan, Jiangsu, Suzhou Applicant before: Kunshan Longteng Optronics Co., Ltd. |
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