CN209070958U - Public electrode voltages generation circuit and display device - Google Patents
Public electrode voltages generation circuit and display device Download PDFInfo
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- CN209070958U CN209070958U CN201822088664.4U CN201822088664U CN209070958U CN 209070958 U CN209070958 U CN 209070958U CN 201822088664 U CN201822088664 U CN 201822088664U CN 209070958 U CN209070958 U CN 209070958U
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Abstract
The utility model discloses a kind of public electrode voltages generation circuit and display device, wherein, the public electrode voltages generation circuit includes power management integrated circuit, voltage comparator circuit and the discharge circuit, power management integrated circuit is set as output public electrode voltages and gate turn-on voltage, gate turn-on voltage is compared by voltage comparator circuit with public electrode voltages, when gate turn-on voltage is less than public electrode voltages, discharge circuit work is triggered, discharge circuit discharges to the public electrode voltages of display panel.
Description
Technical field
The utility model relates to technical field of display panel, in particular to a kind of public electrode voltages generation circuit and display
Device.
Background technique
(Thin Film Transistor Liquid Crystal Display, tft liquid crystal are aobvious by TFT-LCD
Show device) it is one of the principal item that current flat panel is shown, have become modern IT, display platform important in video product.
The main driving principle of TFT-LCD, system board is by R/G/B compressed signal, control signal and power supply by the TCON on pcb board
After (Timing Controller, sequence controller) IC processing, through pcb board, by S-COF (Source-Chip on Film,
Source level film driving chip) and G-COF (Gate-Chip on Film, grid film driving chip) connect with viewing area, thus
So that LCD obtains required power supply and signal.
Wherein, because of the material property of liquid crystal, long duration of action will lead to liquid crystal polarization in voltage same on liquid crystal, make
It is abnormal at display.So TFT-LCD needs public electrode voltages during showing, the voltage of public electrode voltages then will be above
Value is defined as positive polarity, and the voltage value lower than public electrode voltages is defined as negative polarity, carries out to the voltage for being added in liquid crystal both ends
Positive and negative switching.During shutdown, may be excessively slow because of the public electrode voltages velocity of discharge, there is picture exception in display panel.
Utility model content
The main purpose of the utility model is to provide a kind of public electrode voltages generation circuit, it is intended to solve because of public electrode
Tension discharge speed is excessively slow, and the no problem of picture exception occurs in display panel.
To achieve the above object, the utility model proposes a kind of public electrode voltages generation circuit, it is public to be set as output
To the public electrode of display panel, which includes: common-battery pole tension
Power management integrated circuit, including being set as the first voltage output end of output public electrode voltages and being set as
Export the second voltage output end of gate turn-on voltage；
Voltage comparator circuit is set as the gate turn-on voltage being compared with the public electrode voltages, in institute
When stating gate turn-on voltage less than the public electrode voltages, the discharge circuit work is triggered；
The discharge circuit is set as at work, discharging to the public electrode voltages of the display panel.
Optionally, the voltage comparator circuit includes first comparator；
The normal phase input end of the first comparator is connect with the first voltage output end of the power management integrated circuit,
The inverting input terminal of the first comparator is connect with the second source output end of the power management integrated circuit, and described first
The output end of comparator is connect with the controlled end of the discharge circuit.
Optionally, the discharge circuit is the first NMOS tube, the drain electrode of first NMOS tube and the power management collection
At the first voltage output end of circuit, the grid of first NMOS tube is connect with the output end of the voltage comparator circuit, institute
State the source electrode ground connection of the first NMOS tube.
Optionally, the voltage comparator circuit includes the second comparator；The normal phase input end of second comparator and institute
State the second voltage output end connection of power management integrated circuit, the inverting input terminal of second comparator and the power supply pipe
The first power output end connection of integrated circuit is managed, the output end of second comparator and the controlled end of the discharge circuit connect
It connects.
Optionally, the discharge circuit is PMOS tube, the source electrode of the PMOS tube and the power management integrated circuit
First voltage output end, the grid of the PMOS tube are connect with the output end of the voltage comparator circuit, the leakage of the PMOS tube
Pole ground connection.
Optionally, the public electrode voltages generation circuit further include:
Signal transformation circuit is set as after carrying out signal shaping processing to the control signal that the voltage comparator circuit exports
It exports to the discharge circuit.
Optionally, the signal transformation circuit includes d type flip flop and first resistor, the clock signal terminal of the d type flip flop
It is connect with the output end of the voltage comparator circuit, the data input pin of the d type flip flop is connect with DC power supply, the D touching
Send out the controlled end interconnection of the data output end of device, the first end of the first resistor and the discharge circuit, the first resistor
Second end ground connection.
Optionally, the signal transformation circuit includes the second NMOS tube, second resistance and 3rd resistor, the 2nd NMOS
The output end of the grid of pipe, the first end of the second resistance and the voltage comparator circuit interconnects, second NMOS tube
The controlled end of source electrode, the first end of the 3rd resistor and the discharge circuit interconnects, the second end of the second resistance and institute
The second end for stating 3rd resistor is grounded, and the drain electrode of second NMOS tube is connect with DC power supply.
The utility model also proposes a kind of public electrode voltages generation circuit, is set as output public electrode voltages to display
The public electrode of panel, the public electrode voltages generation circuit include:
Power management integrated circuit, including being set as the first voltage output end of output public electrode voltages and being set as
Export the second voltage output end of gate turn-on voltage；
First comparator, d type flip flop, first resistor and the first NMOS tube；
The normal phase input end of the first comparator, the drain electrode of first NMOS tube and the power management integrated circuit
The interconnection of first voltage output end, the second electricity of the inverting input terminal of the first comparator and the power management integrated circuit
Source output terminal connection, the output end of the first comparator are connect with the clock signal terminal of the d type flip flop, the d type flip flop
Data input pin connect with DC power supply, the data output end of the d type flip flop, the first end of the first resistor and described
The grid of first NMOS tube connects, and the grid of first NMOS tube and the second end of the first resistor are grounded；
When the gate turn-on voltage is less than the public electrode voltages, the first comparator triggers the D triggering
Device exports high level to control first NMOS transistor conduction, discharges the public electrode voltages of the display panel.
The utility model also proposes a kind of display device, which includes display panel and common electrical as described above
Pole tension generation circuit.
Technical solutions of the utility model are formed by using power management integrated circuit, voltage comparator circuit and discharge circuit
Public electrode voltages generation circuit, the public electrode voltages generation circuit are set as output public electrode voltages to display panel
Public electrode, power management integrated circuit are set as output public electrode voltages and gate turn-on voltage, voltage comparator circuit
It is set as gate turn-on voltage being compared with public electrode voltages.
When display device works normally, the gate turn-on voltage of power management integrated circuit output is greater than public electrode electricity
Pressure, discharge circuit do not work, and public electrode voltages are normally exported to the public electrode of display panel, and display panel is shown normally.
In display device shutdown, the gate turn-on voltage of power management integrated circuit output declines at first, opens in grid
When opening voltage less than public electrode voltages, voltage comparator circuit triggers discharge circuit work, and discharge circuit works and will be stored in
Public electrode voltages ground connection on display panel, accelerates the velocity of discharge, to solve because the velocity of discharge causes picture different slowly excessively
Normal problem.
Detailed description of the invention
In order to illustrate the embodiment of the utility model or the technical proposal in the existing technology more clearly, below will be to embodiment
Or attached drawing needed to be used in the description of the prior art is briefly described, it should be apparent that, the accompanying drawings in the following description is only
It is some embodiments of the utility model, for those of ordinary skill in the art, in the premise not made the creative labor
Under, the structure that can also be shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the module diagram of one embodiment of the utility model public electrode voltages generation circuit；
Fig. 2 is the electrical block diagram of the utility model public electrode voltages generation circuit first embodiment；
Fig. 3 is the electrical block diagram of the utility model public electrode voltages generation circuit second embodiment；
Fig. 4 is the module diagram of another embodiment of the utility model public electrode voltages generation circuit；
Fig. 5 is the electrical block diagram of the utility model public electrode voltages generation circuit 3rd embodiment；
Fig. 6 is the electrical block diagram of the utility model public electrode voltages generation circuit fourth embodiment；
Fig. 7 is the electrical block diagram of the 5th embodiment of the utility model public electrode voltages generation circuit；
Fig. 8 is the electrical block diagram of the utility model public electrode voltages generation circuit sixth embodiment.
The embodiments will be further described with reference to the accompanying drawings for the realization, functional characteristics and advantage of the utility model aim.
Specific embodiment
The following will be combined with the drawings in the embodiments of the present invention, carries out the technical scheme in the embodiment of the utility model
Clearly and completely describing, it is clear that described embodiment is only a part of the embodiment of the utility model, rather than all
Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are not making creative work premise
Under every other embodiment obtained, fall within the protection scope of the utility model.
It is to be appreciated that the description for being related to " first ", " second " etc. in the present invention is used for description purposes only, and cannot
It is interpreted as its relative importance of indication or suggestion or implicitly indicates the quantity of indicated technical characteristic.Define as a result, " the
One ", the feature of " second " can explicitly or implicitly include at least one of the features.In addition, the "and/or" occurred in full text
Meaning are as follows: including three schemes arranged side by side, by taking " A/B " as an example, including the side that A scheme or B scheme or A and B meet simultaneously
Case in addition, the technical solution between each embodiment can be combined with each other, but must be with those of ordinary skill in the art's energy
It is enough realize based on, will be understood that the knot of this technical solution when conflicting or cannot achieve when occurs in the combination of technical solution
Conjunction is not present, also not within the protection scope of the requires of the utility model.
The utility model proposes a kind of public electrode voltages generation circuit 100, be set as output public electrode voltages
Vcom to display panel 200 public electrode.
As shown in FIG. 1, FIG. 1 is the module diagrams of one embodiment of the utility model public electrode voltages generation circuit, originally
In embodiment, the public electrode voltages generation circuit 100 includes:
Power management integrated circuit 10, including be set as output public electrode voltages Vcom first voltage output end and
It is set as the second voltage output end of output gate turn-on voltage Vgh；
Voltage comparator circuit 20 is set as carrying out the gate turn-on voltage Vgh and public electrode voltages Vcom
Compare, when the gate turn-on voltage Vgh is less than the public electrode voltages Vcom, triggers the discharge circuit 30 and work；
The discharge circuit 30 is set as at work, carrying out the public electrode voltages Vcom of the display panel 200
Electric discharge.
In the present embodiment, the display panel 200 includes but is not limited to liquid crystal display panel, organic light-emitting diode display
Panel, field emission display panel, Plasmia indicating panel, curved face type panel, the liquid crystal display panel include tft liquid crystal
Display panel, TN panel, VA class panel, IPS panel etc..
Power management integrated circuit 10 is the core power part for driving display panel 200, is integrated with multiple and different circuits
The DC-DC conversion circuit of function, each conversion circuit export different voltage values, the output of power management integrated circuit 10
Voltage mainly includes providing digital operation voltage for sequence controller, source driving chip and grid drive chip, being gamma electricity
Road generate reference voltage, for thin film transistor (TFT) opening and closing provide gate turn-on voltage Vgh and gate off voltage and
Public electrode voltages Vcom is generated for the public electrode of display panel 200, and gate turn-on voltage Vgh is maximum, in the present embodiment,
In display device shutdown, 10 output end voltage of power management integrated circuit is from the power down of ceiling voltage elder generation, i.e. gate turn-on voltage
Vgh declines at first, it is to be understood that public affairs can be made by being compared public electrode voltages Vcom with gate turn-on voltage Vgh
Common-battery pole tension Vcom follows gate turn-on voltage Vgh repid discharge, to avoid leading to the problem of display exception.
It is understood that each sub-pix of display panel 200 is made of a thin film transistor (TFT) and capacitor, liquid crystal electricity
To hold and pixel storage capacitor plays the role of equivalent capacity, the equivalent capacity of public electrode and each sub-pix is separately connected,
The equivalent capacity of all sub-pixes of display panel 200 can be equivalent to the first equivalent capacity C1, therefore, display device just
Often when work, the public electrode voltages Vcom that power management integrated circuit 10 exports is exported respectively to the first equivalent capacity C1 and is
First equivalent capacity C1 charges to public electrode voltages Vcom, in display device shutdown, due to capacitance characteristic, tension discharge speed
Degree is slower, so that it is abnormal to will cause display panel 200.
In the present embodiment, voltage comparator circuit 20 does not trigger discharge circuit 30 when display device works normally and works, electricity
Normally output public electrode voltages Vcom is closed to the public electrode of display panel 200 in display device source control integrated circuit 10
When machine, the gate turn-on voltage Vgh that power management integrated circuit 10 exports declines at first, when gate turn-on voltage Vgh is less than public affairs
When common-battery pole tension Vcom, the output control signal triggering discharge circuit 30 of voltage comparator circuit 20 works, the public affairs of display panel 200
Common electrode is grounded through discharge circuit 30, the charge repid discharge being stored on the first equivalent capacity C1, to avoid generating display
Abnormal problem.
In the present embodiment, switching circuit, switch chip or switch member with make-break capacity is can be used in discharge circuit 30
Device, discharge circuit 30 are according to the corresponding conducting of control signal or shutdown that voltage comparator circuit 20 exports and aobvious in conducting
Show that the public electrode of panel 200 is grounded through discharge circuit 30.
Technical solutions of the utility model are by using power management integrated circuit 10, voltage comparator circuit 20 and discharge circuit
30 composition public electrode voltages generation circuits 100, the public electrode voltages generation circuit 100 are set as output public electrode voltages
Vcom to display panel 200 public electrode, power management integrated circuit 10 be set as output public electrode voltages Vcom and
Gate turn-on voltage Vgh, voltage comparator circuit 20 are set as comparing gate turn-on voltage Vgh and public electrode voltages Vcom
Compared with.
When display device works normally, the gate turn-on voltage Vgh that power management integrated circuit 10 exports is greater than public
Electrode voltage Vcom, discharge circuit 30 do not work, and public electrode voltages Vcom is normally exported to the common electrical of display panel 200
Pole, display panel 200 are shown normally.
In display device shutdown, the gate turn-on voltage Vgh that power management integrated circuit 10 exports declines at first, in grid
When pole cut-in voltage Vgh is less than public electrode voltages Vcom, voltage comparator circuit 20 triggers discharge circuit 30 and works, discharge circuit
30 work simultaneously by the public electrode voltages Vcom being stored on display panel 200 be grounded, accelerate the velocity of discharge, thus solve because
The velocity of discharge leads to the problem of picture exception slowly excessively.
As shown in Fig. 2, the circuit structure that Fig. 2 is the utility model public electrode voltages generation circuit first embodiment is illustrated
Scheme, in the present embodiment, the voltage comparator circuit 20 includes first comparator D1；
The first voltage output end of the normal phase input end of the first comparator D1 and the power management integrated circuit 10
The second source output end of connection, the inverting input terminal of the first comparator D1 and the power management integrated circuit 10 connects
It connects, the output end of the first comparator D1 is connect with the controlled end of the discharge circuit 30.
Accordingly, the drain electrode and the power supply that the discharge circuit 30 is the first NMOS tube Q1, the first NMOS tube Q1
The first voltage output end of integrated circuit 10 is managed, the grid of the first NMOS tube Q1 is defeated with the voltage comparator circuit 20
Outlet connection, the source electrode ground connection of the first NMOS tube Q1.
In the present embodiment, when display device works normally, gate turn-on voltage Vgh is greater than public electrode voltages Vcom,
First comparator D1 exports low level, and the first NMOS tube Q1 shutdown, normally output public electrode is electric for power management integrated circuit 10
Vcom to the first equivalent capacity C1 of display panel 200 is pressed, is shut down in display device, gate turn-on voltage Vgh declines and is less than
When public electrode voltages Vcom, first comparator D1 exports high level, and the first NMOS tube Q1 conducting is stored in the first equivalent capacity
Charge on C1 is discharged by the first NMOS tube Q1, accelerates public electrode voltages Vcom electric discharge.
As shown in figure 3, the circuit structure that Fig. 3 is the utility model public electrode voltages generation circuit second embodiment is illustrated
Figure, the voltage comparator circuit 20 include the normal phase input end and the power supply of the second comparator D2, the second comparator D2
Manage the second voltage output end connection of integrated circuit 10, the inverting input terminal of the second comparator D2 and the power management
First power output end of integrated circuit 10 connects, and the output end of the second comparator D2 is controlled with the discharge circuit 30
End connection.
Accordingly, the discharge circuit 30 is PMOS tube Q2, and the source electrode and the power management of the PMOS tube Q2 is integrated
The first voltage output end of circuit 10, the grid of the PMOS tube Q2 are connect with the output end of the voltage comparator circuit 20, institute
State the grounded drain of PMOS tube Q2.
In the present embodiment, when display device works normally, gate turn-on voltage Vgh is greater than public electrode voltages Vcom,
The second comparator D2 exports high level at this time, and PMOS tube Q2 shutdown, public electrode voltages Vcom is normally exported to display surface at this time
The public electrode of plate 200, when display device is shut down and gate turn-on voltage Vgh is less than public electrode voltages Vcom, the second ratio
Low level is exported compared with device D2, PMOS tube Q2 conducting is stored in the first equivalent capacity C1 ground connection electric discharge of display panel 200, thus
Accelerate the public electrode voltages Vcom decline of display panel 200.
As shown in figure 4, Fig. 4 is the module diagram of another embodiment of the utility model public electrode voltages generation circuit,
In the present embodiment, public electrode voltages generation circuit 100 further includes signal transformation circuit 40, and signal transformation circuit 40 is set as pair
The control signal that the voltage comparator circuit 20 exports exports after carrying out signal shaping processing to the discharge circuit 30.
Signal transformation circuit 40 carries out shaping and isolation to the control signal that voltage comparator circuit 20 exports, while exporting whole
Control signal after shape is to discharge circuit 30, and 40 particular circuit configurations of signal transformation circuit are according to the circuit of voltage comparator circuit 20
Structure is different and different.
In an alternative embodiment, the signal transformation circuit 40 includes d type flip flop D3 and first resistor R1, the D touching
The clock signal terminal C of hair device D3 is connect with the output end of the voltage comparator circuit 20, the data input pin of the d type flip flop D3
D is connect with DC power supply, the data output end Q of the d type flip flop D3, the first end of the first resistor R1 and electric discharge electricity
The controlled end on road 30 interconnects, the second end ground connection of the first resistor R1.
As shown in figure 5, the circuit structure that Fig. 5 is the utility model public electrode voltages generation circuit 3rd embodiment is illustrated
Figure, when voltage comparator circuit 20 is first comparator D1 and discharge circuit 30 is the first NMOS tube Q1, d type flip flop D3 according to when
The corresponding triggering of the rising edge signal that clock signal end C is received, when display device works normally, gate turn-on voltage Vgh is greater than
Public electrode voltages Vcom, first comparator D1 export the clock signal terminal C of low level to d type flip flop D3, d type flip flop D3 not work
Make, after display device shutdown and when gate turn-on voltage Vgh is less than public electrode voltages Vcom, first comparator D1 output
High level, d type flip flop D3 work and enter data into the high level output at end and be connected to data output end Q, the first NMOS tube Q1,
First equivalent capacity C1 of display panel 200 is grounded electric discharge.
As shown in fig. 6, the circuit structure that Fig. 6 is the utility model public electrode voltages generation circuit fourth embodiment is illustrated
Figure, when voltage comparator circuit 20 is the second comparator D2 and discharge circuit 30 is PMOS tube Q2, d type flip flop D3 believes according to clock
Number corresponding triggering of the rising edge signal that receives of termination, when display device works normally, gate turn-on voltage Vgh is greater than common electrical
Pole tension Vcom, first comparator D1 export the clock signal terminal C of high level to d type flip flop D3, and d type flip flop D3 works, and defeated
High level is not turned on to PMOS tube Q2, PMOS tube Q2 out, and gate turn-on voltage Vgh normally exports public to display panel 200
Electrode, after display device shutdown and when gate turn-on voltage Vgh is less than public electrode voltages Vcom, first comparator D1 is defeated
Low level out, d type flip flop D3 do not work, and the grid input low level of the first NMOS tube Q1 is simultaneously connected, and the first of display panel 200
Equivalent capacity C1 ground connection electric discharge.
In an alternative embodiment, the signal transformation circuit 40 can also include the second NMOS tube Q3, second resistance R2
With 3rd resistor R3, the grid of the second NMOS tube Q3, the first end of the second resistance R2 and the voltage comparator circuit
20 output end interconnection, the first end and the discharge circuit 30 of the source electrode of the second NMOS tube Q3, the 3rd resistor R3
Controlled end interconnection, the second end of the second end of the second resistance R2 and the 3rd resistor R3 is grounded, described second
The drain electrode of NMOS tube Q3 is connect with DC power supply.
As shown in fig. 7, the circuit structure that Fig. 7 is the 5th embodiment of the utility model public electrode voltages generation circuit is illustrated
Figure, in voltage comparator circuit 20 be first comparator D1 and discharge circuit 30 is the first NMOS tube Q1, when the normal work of display device
When making, gate turn-on voltage Vgh is greater than public electrode voltages Vcom, and first comparator D1 exports low level to the second NMOS tube
Q3, the second NMOS tube Q3 are failure to actuate, and the grid of the first NMOS tube Q1 receives low level and is equally failure to actuate, and shut down in display device
Afterwards and when gate turn-on voltage Vgh is less than public electrode voltages Vcom, first comparator D1 exports high level, the second NMOS tube
Q3 movement, signal transformation circuit 40 export high level, the first NMOS tube Q1 conducting, the first equivalent capacity C1 of display panel 200
Ground connection electric discharge.
As shown in figure 8, the circuit structure that Fig. 8 is the utility model public electrode voltages generation circuit sixth embodiment is illustrated
Figure is worked normally when voltage comparator circuit 20 is the second comparator D2 and discharge circuit 30 is PMOS tube Q2 in display device
When, gate turn-on voltage Vgh is greater than public electrode voltages Vcom, and first comparator D1 exports high level to the second NMOS tube Q3,
Second NMOS tube Q3 movement, signal transformation circuit 40 export high level to PMOS tube Q2, and PMOS tube Q2 is failure to actuate, in display device
After shutdown and when gate turn-on voltage Vgh is less than public electrode voltages Vcom, first comparator D1 output low level, second
NMOS tube Q3 is failure to actuate, and signal transformation circuit 40 exports low level, PMOS tube Q2 conducting, the equivalent electricity of the first of display panel 200
Hold C1 ground connection electric discharge.
The utility model also proposes a kind of public electrode voltages generation circuit 100, is set as output public electrode voltages
To the public electrode of display panel 200, the public electrode voltages generation circuit 100 includes: Vcom
Power management integrated circuit 10, including be set as output public electrode voltages Vcom first voltage output end and
It is set as the second voltage output end of output gate turn-on voltage Vgh；
First comparator D1, d type flip flop D3, first resistor R1 and the first NMOS tube Q1；
The normal phase input end of the first comparator D1, the drain electrode of the first NMOS tube Q1 and the power management are integrated
The first voltage output end of circuit 10 interconnects, the inverting input terminal of the first comparator D1 and the power management integrated circuit
The clock signal terminal of 10 second source output end connection, the output end of the first comparator D1 and the d type flip flop D3 connect
It connects, the data input pin of the d type flip flop D3 is connect with DC power supply, the output end of the d type flip flop D3, the first resistor
The connection of the grid of the first end of R1 and the first NMOS tube Q1, the grid and the first resistor R1 of the first NMOS tube Q1
Second end be grounded；
When the gate turn-on voltage Vgh is less than the public electrode voltages Vcom, the first comparator D1 triggering
The d type flip flop D3 output high level is to control the first NMOS tube Q1 conducting, to the public electrode of the display panel 200
Voltage Vcom discharges.
The utility model also proposes a kind of display device, which includes display panel 200 and public electrode voltages
Generation circuit 100, the specific structure of the public electrode voltages generation circuit 100 is referring to above-described embodiment, due to this display device
Using whole technical solutions of above-mentioned all embodiments, therefore at least institute brought by the technical solution with above-described embodiment
There is beneficial effect, this is no longer going to repeat them.
The above is only the preferred embodiment of the present invention, and therefore it does not limit the scope of the patent of the utility model,
Under all utility models in the utility model are conceived, equivalent structure made based on the specification and figures of the utility model
Transformation, or directly/be used in other related technical areas indirectly and be included in the scope of patent protection of the utility model.
Claims (10)
1. a kind of public electrode voltages generation circuit is set as the public electrode of output public electrode voltages to display panel,
It is characterized in that, the public electrode voltages generation circuit includes:
Power management integrated circuit, including being set as the first voltage output end of output public electrode voltages and being set as exporting
The second voltage output end of gate turn-on voltage；
Voltage comparator circuit is set as the gate turn-on voltage being compared with the public electrode voltages, in the grid
When pole cut-in voltage is less than the public electrode voltages, triggering discharge circuit work；And
The discharge circuit is set as at work, discharging to the public electrode voltages of the display panel.
2. public electrode voltages generation circuit as described in claim 1, which is characterized in that the voltage comparator circuit includes the
One comparator；
The normal phase input end of the first comparator is connect with the first voltage output end of the power management integrated circuit, described
The inverting input terminal of first comparator is connect with the second source output end of the power management integrated circuit, and described first compares
The output end of device is connect with the controlled end of the discharge circuit.
3. public electrode voltages generation circuit as claimed in claim 2, which is characterized in that the discharge circuit is the first NMOS
Pipe, the drain electrode of first NMOS tube and the first voltage output end of the power management integrated circuit, first NMOS tube
Grid connect with the output end of the voltage comparator circuit, the source electrode of first NMOS tube ground connection.
4. public electrode voltages generation circuit as described in claim 1, which is characterized in that the voltage comparator circuit includes the
Two comparators；
The normal phase input end of second comparator is connect with the second voltage output end of the power management integrated circuit, described
The inverting input terminal of second comparator is connect with the first power output end of the power management integrated circuit, and described second compares
The output end of device is connect with the controlled end of the discharge circuit.
5. public electrode voltages generation circuit as claimed in claim 4, which is characterized in that the discharge circuit is PMOS tube,
The first voltage output end of the source electrode of the PMOS tube and the power management integrated circuit, the grid of the PMOS tube with it is described
The output end of voltage comparator circuit connects, the grounded drain of the PMOS tube.
6. public electrode voltages generation circuit as described in claim 1, which is characterized in that the public electrode voltages generate electricity
Road further include:
Signal transformation circuit is set as exporting after carrying out signal shaping processing to the control signal that the voltage comparator circuit exports
To the discharge circuit.
7. public electrode voltages generation circuit as claimed in claim 6, which is characterized in that the signal transformation circuit includes D
Trigger and first resistor, the clock signal terminal of the d type flip flop are connect with the output end of the voltage comparator circuit, the D
The data input pin of trigger is connect with DC power supply, the first end of the data output end of the d type flip flop, the first resistor
And the controlled end interconnection of the discharge circuit, the second end ground connection of the first resistor.
8. public electrode voltages generation circuit as claimed in claim 6, which is characterized in that the signal transformation circuit includes the
Two NMOS tubes, second resistance and 3rd resistor, the grid of second NMOS tube, the first end of the second resistance and the electricity
Press the output end interconnection of comparison circuit, the source electrode of second NMOS tube, the first end of the 3rd resistor and electric discharge electricity
The controlled end on road interconnects, and the second end of the second end of the second resistance and the 3rd resistor is grounded, the 2nd NMOS
The drain electrode of pipe is connect with DC power supply.
9. a kind of public electrode voltages generation circuit is set as the public electrode of output public electrode voltages to display panel,
It is characterized in that, the public electrode voltages generation circuit includes:
Power management integrated circuit, including being set as the first voltage output end of output public electrode voltages and being set as exporting
The second voltage output end of gate turn-on voltage；
First comparator, d type flip flop, first resistor and the first NMOS tube；
The of the normal phase input end of the first comparator, the drain electrode of first NMOS tube and the power management integrated circuit
The interconnection of one voltage output end, the inverting input terminal of the first comparator and the second source of the power management integrated circuit are defeated
Outlet connection, the output end of the first comparator are connect with the clock signal terminal of the D trigger, the number of the d type flip flop
It is connect according to input terminal with DC power supply, the data output end of the d type flip flop, the first end of the first resistor and described first
The grid of NMOS tube connects, and the grid of first NMOS tube and the second end of the first resistor are grounded；
When the gate turn-on voltage is less than the public electrode voltages, it is defeated that the first comparator triggers the d type flip flop
High level discharges to the public electrode voltages of the display panel with controlling first NMOS transistor conduction out.
10. a kind of display device, which is characterized in that the display device includes display panel and such as claim 1-8 or 9 is any
Public electrode voltages generation circuit described in one.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822088664.4U CN209070958U (en) | 2018-12-12 | 2018-12-12 | Public electrode voltages generation circuit and display device |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822088664.4U CN209070958U (en) | 2018-12-12 | 2018-12-12 | Public electrode voltages generation circuit and display device |
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| CN209070958U true CN209070958U (en) | 2019-07-05 |
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| CN201822088664.4U Active CN209070958U (en) | 2018-12-12 | 2018-12-12 | Public electrode voltages generation circuit and display device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112908277A (en) * | 2021-02-03 | 2021-06-04 | 重庆先进光电显示技术研究院 | Gate-on voltage output control circuit, gate-less driving device and display device |
| CN113192450A (en) * | 2021-04-27 | 2021-07-30 | 京东方科技集团股份有限公司 | Display device and using method |
| CN114005418A (en) * | 2021-10-29 | 2022-02-01 | 绵阳惠科光电科技有限公司 | Common voltage generation circuit, display panel drive circuit and display device |
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2018
- 2018-12-12 CN CN201822088664.4U patent/CN209070958U/en active Active
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112908277A (en) * | 2021-02-03 | 2021-06-04 | 重庆先进光电显示技术研究院 | Gate-on voltage output control circuit, gate-less driving device and display device |
| CN112908277B (en) * | 2021-02-03 | 2022-11-15 | 重庆先进光电显示技术研究院 | Gate-on voltage output control circuit, gate-less driving device and display device |
| CN113192450A (en) * | 2021-04-27 | 2021-07-30 | 京东方科技集团股份有限公司 | Display device and using method |
| CN113192450B (en) * | 2021-04-27 | 2023-10-31 | 京东方科技集团股份有限公司 | Display device and use method |
| CN114005418A (en) * | 2021-10-29 | 2022-02-01 | 绵阳惠科光电科技有限公司 | Common voltage generation circuit, display panel drive circuit and display device |
| CN114005418B (en) * | 2021-10-29 | 2022-09-20 | 绵阳惠科光电科技有限公司 | Common voltage generating circuit, display panel driving circuit and display device |
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