CN108231022A - Driving circuit and driving method, the liquid crystal display device of liquid crystal display device - Google Patents
Driving circuit and driving method, the liquid crystal display device of liquid crystal display device Download PDFInfo
- Publication number
- CN108231022A CN108231022A CN201810012256.2A CN201810012256A CN108231022A CN 108231022 A CN108231022 A CN 108231022A CN 201810012256 A CN201810012256 A CN 201810012256A CN 108231022 A CN108231022 A CN 108231022A
- Authority
- CN
- China
- Prior art keywords
- voltage
- liquid crystal
- crystal display
- gate
- display device
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- 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
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
-
- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09G—ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION
- G09G2330/00—Aspects of power supply; Aspects of display protection and defect management
- G09G2330/02—Details of power systems and of start or stop of display operation
- G09G2330/027—Arrangements or methods related to powering off a display
Abstract
The invention discloses driving circuit and driving method, the liquid crystal display device of a kind of liquid crystal display device, which includes：Trigger signal is generated after the first time period at liquid crystal display device shutdown moment；The gate-on voltage of the thin film transistor (TFT) in second time period in raising liquid crystal display device is controlled according to the trigger signal.The driving method can avoid the pixel capacitance charge residue phenomenon in liquid crystal display device, so as to solve the screen flicker phenomenon of shutdown moment liquid crystal display device.
Description
Technical field
Driving circuit and driving method the present invention relates to display technology field more particularly to a kind of liquid crystal display device,
Liquid crystal display device.
Background technology
Current liquid crystal display device, in shutdown, although having cut off power supply, due in liquid crystal display device
The pixel capacitance charge of pixel unit can not be substantially discharged, and can lead to the moment liquid crystal display device that shuts down there are charge residue
Screen flicker, screen flicker phenomenon when how to improve shutdown is problem to be solved.
Invention content
The present invention provides a kind of driving circuit and driving method, liquid crystal display device of liquid crystal display device, to solve phase
Deficiency in the technology of pass.
According to the first aspect of the invention, a kind of driving method of liquid crystal display device is provided, including：
Trigger signal is generated after the first time period at liquid crystal display device shutdown moment；
The grid of the thin film transistor (TFT) in second time period in raising liquid crystal display device is controlled according to the trigger signal
Conducting voltage.
Optionally, the generation trigger signal after the first time period at liquid crystal display device shutdown moment includes：
After the input voltage for detecting liquid crystal display device drops to first voltage and it is more than before second voltage, it is raw
Into trigger signal, the first voltage is more than second voltage, and the second voltage is equal to the under-voltage protection voltage of main control chip.
Optionally, it is described to control the film in second time period in raising liquid crystal display device brilliant according to the trigger signal
The gate-on voltage of body pipe, including：
It controls to increase in second time period by the trigger signal and flows through point for being connected to gate-on voltage output terminal
The electric current of piezoresistance to increase the pressure drop of the divider resistance, increases the gate-on voltage.
Optionally, described flowed through by increase in trigger signal control second time period is connected to gate-on voltage
The electric current of the divider resistance of output terminal, to increase the pressure drop of the divider resistance, including：
It is controlled by the trigger signal and first resistor is connected in parallel on to be connected to gate-on voltage defeated in second time period
In branch where the divider resistance of outlet, the electric current of the divider resistance, branch packet where the divider resistance are flowed through with increase
The divider resistance being connected between gate-on voltage output terminal and ground terminal and second resistance are included, in the divider resistance and institute
It states and connects reference voltage end between second resistance.
Optionally, it is described to be connected to grid by being connected in parallel on first resistor in trigger signal control second time period
In branch where the divider resistance of conducting voltage output terminal, including：
The electronic switch connected by trigger signal control with the first resistor is closed in second time period, with
The first resistor and the electronic switch is in parallel with the second resistance.
According to the second aspect of the invention, a kind of driving circuit of liquid crystal display device is provided, including：
Trigger signal generation unit, for the generation triggering letter after the first time period at liquid crystal display device shutdown moment
Number；
Gate-on voltage control unit increases liquid crystal display for being controlled in second time period according to the trigger signal
The gate-on voltage of thin film transistor (TFT) in device.
Optionally, the Input voltage terminal of the trigger signal generation unit and liquid crystal display device connects, the triggering life
It is specifically used for into unit：After the input voltage for the Input voltage terminal for detecting liquid crystal display device drops to first voltage and
Before second voltage, trigger signal is generated, the first voltage is more than second voltage, and the second voltage is equal to master control core
The under-voltage protection voltage of piece.
Optionally, the gate-on voltage control unit, including：
Divider resistance is connected to gate-on voltage output terminal；
Voltage control unit is connect with the trigger signal generation unit, for controlling second by the trigger signal
The electric current for the divider resistance for being connected to gate-on voltage output terminal is flowed through in increase in period, to increase the divider resistance
Pressure drop makes the gate-on voltage raising of the gate-on voltage output terminal output.
Optionally, the voltage control unit includes：
Second resistance, the second resistance and the divider resistance be connected to gate-on voltage output terminal and ground terminal it
Between, connect reference voltage end between the divider resistance and the second resistance；
, institute in parallel with the second resistance after first resistor and switch, the first resistor and electronic switch series connection
It states electronic switch to connect with the trigger signal generation unit, the electronic switch is after the trigger signal is received second
It is closed in period.
According to the third aspect of the present invention, a kind of liquid crystal display device is provided, including power supply chip and any of the above-described institute
The driving circuit stated, the Input voltage terminal of the power supply chip are connect with the driving circuit, and the grid of the power supply chip is led
Logical voltage output end is connect with the driving circuit.
According to above-mentioned technical proposal it is found that the driving method, due to the second time after the short period at shutdown moment
In section, the gate-on voltage VGH of TFT is increased, therefore, gate-on voltage VGH in second time period will not immediately under
Drop, and get a promotion in second time period after shut down, the pixel capacitance of pixel unit is enable to open electric discharge completely, discharges picture
The plain remaining charge of capacitance, and discharge time is extended, make charge release more abundant, therefore, charge residue can be avoided to show
As so as to solve the screen flicker phenomenon of shutdown moment liquid crystal display device.
It should be understood that above general description and following detailed description are only exemplary and explanatory, not
It can the limitation present invention.
Description of the drawings
Attached drawing herein is incorporated into specification and forms the part of this specification, shows the implementation for meeting the present invention
Example, and be used to explain the principle of the present invention together with specification.
Fig. 1 is the structure diagram according to the driving circuit of the liquid crystal display device shown in one embodiment of the invention；
Fig. 2 is the flow chart according to the driving method of the liquid crystal display device shown in one embodiment of the invention；
Fig. 3 is the structure diagram according to the driving circuit of the liquid crystal display device shown in one embodiment of the invention；
Fig. 4 is the sequence diagram according to signal each in the driving circuit of the liquid crystal display device shown in one embodiment of the invention.
Specific embodiment
Here exemplary embodiment will be illustrated in detail, example is illustrated in the accompanying drawings.Following description is related to
During attached drawing, unless otherwise indicated, the same numbers in different attached drawings represent the same or similar element.Following exemplary embodiment
Described in embodiment do not represent and the consistent all embodiments of the present invention.On the contrary, they be only with it is such as appended
The example of the consistent device and method of some aspects being described in detail in claims, of the invention.
Liquid crystal display device is a kind of passively luminous display device, is provided with liquid crystal layer and backlight, by
Apply voltage on liquid crystal layer, liquid crystal molecule deflects, the birefringence principle based on liquid crystal molecule, to the light that backlight is sent out into
Row modulation, final to realize that image is shown, liquid crystal molecule will realize that deflection is needed by applying voltage to it, if revocation voltage,
Liquid crystal molecule can return elastically original state based on intermolecular.
Liquid crystal display device includes multiple pixel units, and each pixel unit includes thin film transistor (TFT), pixel electrode and public affairs
Common electrode etc. by controlling the conducting or shutdown of thin film transistor (TFT) in each pixel unit, and then controls pixel electrode and public
Voltage between electrode, to control the deflection of liquid crystal molecule.
The scan frequency of liquid crystal display device is generally 60Hz, i.e. 60 frame pictures of display per second, the display of a frame picture
Time is about 1/60s=16.7ms, and therefore, being applied to the voltage of each pixel unit needs during this period of time to maintain, because
This usually sets pixel capacitance in each pixel unit, and the display time of a frame picture is maintained by pixel capacitance.
Liquid crystal display device is to thin film transistor (TFT) in each pixel unit (Thin Film Transistor, abbreviation TFT)
What control was realized by gate driving circuit, gate driving circuit can be realized by grid drive chip IC, can also be passed through
GOA (Gate Driver on Array, the driving of array substrate row, abbreviation GOA) technology is realized, i.e., directly by gate driving circuit
It is produced in array substrate, to replace external grid drive chip, GOA technologies can reduce the preparation journey of liquid crystal display device
Sequence reduces cost, realizes narrow frame.
At present in the control of thin film transistor (TFT) TFT, VGH and VGL are control TFT turn-on and turn-off in liquid crystal display device
Voltage, TFT be connected when, pixel capacitance charges, TFT turn off when, by pixel capacitance maintain a frame picture the display time, as
Plain capacitance can gradually discharge, and the charge wherein stored be discharged, until next frame charges again to it.
Original VGH and VGL are usually provided by power supply chip, then by gate driving circuit according to scanning sequence control pair
Each row TFT exports VGH and VGL.
At present, by liquid crystal display device switching on and shutting down ON/OFF test experiments in a high temperauture environment, finding to liquid
Crystal device shuts down moment, since VGH (the present embodiment is known as gate-on voltage) power down is too fast, makes the pixel of pixel unit
Charge in capacitance can not discharge completely, there are charge residue, therefore lead to the screen flicker of shutdown moment liquid crystal display device.
In order to solve this problem, a solution is provided in the relevant technologies, as shown in Figure 1, liquid crystal display device
Including power supply chip 1, power supply chip 1 has gate-on voltage VGH output terminals, multiple electric capacity of voltage regulation is parallel in the output terminal
C1, C2 and C3 can reduce the power down speed of VGH by increasing electric capacity of voltage regulation, improve screen flicker phenomenon to a certain extent, but
It is that effect is still undesirable.
It should be noted that can also connect a resistance R0 in output terminal, power supply chip is generally also provided with other output terminals,
The concrete structure present invention of power supply chip does not limit this,
Accordingly, the embodiment of the present invention provides a kind of driving method of liquid crystal display device, as shown in Fig. 2, the driving method,
Including：
Step S10, trigger signal is generated after the first time period at liquid crystal display device shutdown moment；
Step S20, the thin film transistor (TFT) in second time period in raising liquid crystal display device is controlled according to trigger signal
Gate-on voltage.
Usually there is power supply chip in liquid crystal display device, power supply chip has Input voltage terminal, connects with externally fed power supply
It connecing, power supply chip is used to provide required operating voltage to element each in liquid crystal display device, and liquid crystal display device is made to work, when
When liquid crystal display device shuts down, liquid crystal display device no longer works, the first time period at moment of shutting down (this between first section be usually
One shorter time, such as several seconds) after, i.e., after the very short time at time point where shutdown, generate trigger signal, the triggering
Signal is used to control the gate-on voltage VGH of TFT in raising liquid crystal display device in postboost second time period.
Since in the second time period after the short period at shutdown moment, the gate-on voltage VGH of TFT being increased,
Therefore, gate-on voltage VGH will not decline immediately in second time period, and (this second for second time period after shut down
Period is usually the shorter time) in get a promotion, the pixel capacitance of pixel unit is enable to open electric discharge completely, release picture
The plain remaining charge of capacitance, and discharge time is extended, make charge release more abundant, therefore, charge residue can be avoided to show
As so as to solve the screen flicker phenomenon of shutdown moment liquid crystal display device.
It should be noted that above-mentioned gate-on voltage VGH is after shut down, the source electrode of TFT no longer input data
Voltage, within the short period at shutdown moment, gate-on voltage VGH only plays the role of opening pixel capacitance, Bu Huitong
TFT is crossed as pixel capacitance charges, can only be discharged pixel capacitance, the residual charge stored in pixel capacitance before release,
Therefore, the present embodiment is by the way that the gate-on voltage VGH of TFT is increased, and pixel capacitance opening time can be made longer and more fully,
The residual charge stored in pixel capacitance can be played the role of fully to discharge in this way.
In an optional embodiment, described in above-mentioned steps S10 liquid crystal display device shutdown the moment first
Trigger signal is generated after period to include：
After the input voltage for detecting liquid crystal display device drops to first voltage and it is more than before second voltage, it is raw
Into trigger signal, first voltage is more than second voltage, and second voltage is equal to the under-voltage protection voltage of main control chip.
Current liquid crystal display usually has under-voltage protection mechanism, specifically, when under the input voltage of power supply chip
When being decreased to less than a certain voltage of normal working voltage, to avoid liquid crystal display device due to external power supply failure or itself is short
The reasons such as road failure or load excessive lead to occur being greatly lowered in the input voltage short time the phenomenon that even disappearing, because
This can cause to bring damage to liquid crystal display device, for this purpose, when input voltage is less than a certain voltage, will disconnect to liquid crystal display
The power supply of device.
When liquid crystal display device shuts down, will be switched off power supply of the externally fed power supply to power supply chip, power supply chip it is defeated
Entering the input voltage vin of voltage end can decline until be zero, can be by detecting the input voltage of power supply chip in the present embodiment
The situation of Vin judges the shutdown moment, can determine whether that liquid crystal display device is shutting down when detecting that input voltage vin declines, when
When input voltage vin drops to first voltage, also, it is further, detecting that it is electric that input voltage vin drops to under-voltage protection
Before pressure, generate trigger signal, in this way can to avoid after input voltage vin drops to under-voltage protection voltage to liquid crystal display
After device disconnects power supply, due to element each in liquid crystal display device since power-off can not work, and then can not pass through related elements
Increasing gate conducting voltage VGH is controlled, therefore, before input voltage drops to under-voltage protection voltage, generates trigger signal, it can
To ensure that the driving method smoothly performs.
First voltage can be arranged as required to the input electricity of main control chip during for example, liquid crystal display device normal work
The 80-70% of pressure, under-voltage protection voltage UVLO are less than the first voltage, the input voltage of main control chip when can be normal work
60-50%.
It should be noted that above-mentioned gate-on voltage VGH needs to be more than under-voltage protection voltage UVLO, if master control core
For the gate-on voltage VGH of piece output less than UVLO after under-voltage protection voltage, main control chip can carry out self-shield, such master control core
Piece can not just export gate-on voltage VGH, also just can not after the moment of shutting down increasing gate conducting voltage VGH.
It is of course also possible to the shutdown moment of liquid crystal display device is detected by other means and then generates trigger signal, example
Such as, the input voltage of the main control chip or other driving chips in liquid crystal display device can be detected, electricity is inputted when detecting
It is the shutdown moment at the time of drops, accordingly generates trigger signal；Or pass through Software Create when liquid crystal display device shuts down
One pulse signal may determine that the shutdown moment of liquid crystal display device when detecting the pulse signal, accordingly generate triggering letter
Number.The embodiment of the present invention does not limit this.
In some instances, being controlled in second time period according to the trigger signal described in above-mentioned steps S20 increases liquid
The gate-on voltage of thin film transistor (TFT) in crystal device, including：
It controls to increase to flow through in postboost second time period by trigger signal and is connected to gate-on voltage output terminal
Divider resistance electric current, to increase the pressure drop of divider resistance, increase gate-on voltage.
In the present embodiment, the electric current of the divider resistance of gate-on voltage output terminal is connected to by increase, and then divide
The pressure drop of resistance can also increase, the voltage increase of gate-on voltage output terminal, and then increase gate-on voltage VGH.
On the basis of above-described embodiment, controlled in second time period by trigger signal and first resistor is connected in parallel on connection
In branch where the divider resistance of gate-on voltage output terminal, the electric current of divider resistance, divider resistance institute are flowed through with increase
Include being connected to divider resistance and second resistance between gate-on voltage output terminal and ground terminal in branch, in divider resistance
Reference voltage end is connected between second resistance.
In the present embodiment, pass through branch where first resistor to be connected in parallel on to the divider resistance of gate-on voltage output terminal
In, since first resistor is in parallel with divider resistance, and the voltage of the reference voltage end of branch where divider resistance is constant, therefore,
The electric current of branch can increase where divider resistance, and the pressure drop of divider resistance can also increase, the output of gate-on voltage output terminal
Voltage increases, and then increases gate-on voltage VGH.
For being controlled by trigger signal first resistor is connected in parallel on to be connected to gate-on voltage defeated in second time period
Mode in branch where the divider resistance of outlet can be：
The electronic switch connected by trigger signal control with first resistor is closed in second time period, by the first electricity
Resistance and the electronic switch are in parallel with second resistance.
In the present embodiment, first resistor is connected with electronic switch, and first resistor and electronic switch are in parallel with second resistance,
Therefore, first resistor and electronic switch will be formed in parallel with second resistance after switch is closed, and second resistance is connected on and is divided
In branch where resistance, therefore, the electric current of branch increases where divider resistance, the pressure drop increase of divider resistance, gate turn-on electricity
The output voltage increase of output terminal is pressed, and then increases gate-on voltage.
Above-mentioned electronic switch is that can control its opening or the switch closed by electric signal, for example, metal aoxidizes
Object semiconductor field effect transistor (Metal-Oxid-Semiconductor, abbreviation metal-oxide-semiconductor) or thin film transistor (TFT) TFT etc.,
Trigger signal can be a pulse signal, electronic switch can be controlled to be connected by the pulse signal, for example, electronic switch is N
Type metal-oxide-semiconductor, trigger signal is a high level pulse signal, when the high level time of the high level pulse signal is above-mentioned second
Between section, the output time of the pulse signal be shut down the moment first time period after, when the control terminal (such as grid) of metal-oxide-semiconductor connects
When receiving the pulse signal, metal-oxide-semiconductor is connected in the second time period, and then, it is electric with second after first resistor and metal-oxide-semiconductor series connection
Resistance forms in parallel, metal-oxide-semiconductor shutdown after second time period, therefore, in the second time period after the first time period at shutdown moment
Increase gate-on voltage.Electronic switch may be p-type metal-oxide-semiconductor, and trigger signal can be low level pulse signal at this time,
P-type metal-oxide-semiconductor is connected in low level, can also reach same purpose, and electronic switch may be other kinds of electronic cutting
It closes, the embodiment of the present invention does not limit the type that this is switched.
The embodiment of the present invention also provides a kind of driving circuit of liquid crystal display device, including
Trigger signal generation unit, for the generation triggering letter after the first time period at liquid crystal display device shutdown moment
Number；
Gate-on voltage control unit increases liquid crystal display device for being controlled in second time period according to trigger signal
In thin film transistor (TFT) gate-on voltage.
In some instances, the Input voltage terminal of the trigger signal generation unit and liquid crystal display device connects, described
Triggering generation unit is specifically used for：First voltage is dropped in the input voltage for the Input voltage terminal for detecting liquid crystal display device
Later and more than trigger signal before second voltage, is generated, the first voltage is more than second voltage, and the second voltage is equal to
The under-voltage protection voltage of main control chip.
In an optional embodiment, in the driving circuit, the gate-on voltage control unit, including：
Divider resistance is connected to gate-on voltage output terminal；
Voltage control unit is connected to grid and leads for increase being controlled in second time period to flow through by the trigger signal
The electric current of the divider resistance of logical voltage output end to increase the pressure drop of the divider resistance, increases the gate-on voltage.
Fig. 3 show a kind of structure diagram of driving circuit provided in an embodiment of the present invention, which includes：
Trigger signal generation unit 101 is connect with the Input voltage terminal of liquid crystal display device, which can be
The Input voltage terminal being arranged on power supply chip 1；
It is defeated that second resistance R2 and divider resistance Rf, second resistance R2 with divider resistance Rf are connected to gate-on voltage VGH
Outlet (the gate-on voltage output terminal is arranged on power supply chip in figure) is between ground terminal GND, divider resistance Rf and
Reference voltage end Vref, ground terminal GND and reference voltage end Vref are connected between two resistance R2 to be provided by power supply chip；
First resistor R1 and electronic switch K, first resistor R1 and electronic switch K are in parallel with second resistance R2 after connecting, electricity
Sub switch K is connect with trigger signal generation unit 101, and electronic switch K is closed in second time period after receiving the trigger signal
It closes, first resistor R1 and electronic switch K is in parallel with second resistance R2.
Above-mentioned electronic switch K shown in figure is metal-oxide-semiconductor, at this point, can be by the control terminal (such as grid) of metal-oxide-semiconductor and triggering
Signal generation unit 101 connects, circuit where the other termination (such as source electrode and drain electrode) of metal-oxide-semiconductor is connected on first resistor R1
In, metal-oxide-semiconductor is connected with first resistor R1.
The sequence diagram of input voltage vin, gate-on voltage VGH and trigger signal in the driving method of the driving circuit
As shown in figure 4, the course of work of the driving circuit is,
As shown in Figure 3 and Figure 4, the power supply chip 101 of liquid crystal display device has gate-on voltage output terminal, the grid
Conducting voltage output terminal exports gate-on voltage VGH, can pass through in the output terminal multiple electric capacity of voltage regulation C1, C2 and C3 in parallel
The power down speed of gate-on voltage VGH can be reduced to a certain extent by increasing electric capacity of voltage regulation, but can not be carried in a short time
Gate-on voltage VGH is risen, in this implementation, above-mentioned driving circuit is further set.
By taking electronic switch K is p-type metal-oxide-semiconductor as an example, when liquid crystal display device works normally, the input voltage of power supply chip
The input voltage vin at end is a certain size voltage, and gate-on voltage VGH is high level, and trigger signal generation unit exports
Signal Xon be in high level, the control terminal of trigger signal generation unit and metal-oxide-semiconductor connects, at this point, metal-oxide-semiconductor turns off, grid is led
For example following formula of gate-on voltage VGH of logical voltage output end output：
When liquid crystal display device shuts down, input voltage vin is begun to decline, after first time period, i.e., the T1 moment when, under
When being down to first voltage (such as 0.7Vin), also, input voltage vin drop to second voltage (under-voltage protection voltage, such as
Before 0.6Vin), i.e., before the T2 moment, the Xon signals that trigger signal generation unit 101 exports become low level from high level,
Generate a trigger signal, metal-oxide-semiconductor conducting, first resistor R1 forms in parallel, and the electricity of reference voltage Vref with second resistance R2
It pressing constant so that the electric current of branch increases where divider resistance Rf, so as to which the pressure drop on divider resistance Rf improves, gate turn-on electricity
Press for example following formula of gate-on voltage VGH of output terminal output：
It can be seen that gate-on voltage VGH increases compared to before not shutting down by the formulaSuch as Fig. 4 institutes
Show, gate-on voltage VGH (second time period is a short period) in second time period is improved, and makes shutdown moment pixel
The pixel capacitance of unit opens electric discharge completely, discharges the remaining charge of pixel capacitance, and extend discharge time, releases charge
It puts and is more substantially discharged more fully, avoid the occurrence of ON/OFF scintillations.
Above-mentioned driving circuit can be integrated in the setting power supply chip of liquid crystal display device and the printing electricity of other chips
On the plate PCB of road, in order to which above-mentioned driving circuit is connect with power supply chip.
Needing specification is, as shown in figure 4, since the gate-on voltage VGH of grid voltage output terminal is by power supply chip
It provides, the power supply chip is in shutdown moment since its input voltage vin will not drop to zero at once, and the driving circuit is after shut down
Short time in can work, make the gate-on voltage VGH that power supply chip exports in a short time (during t1 shown in figure to t2
Between in section, i.e., in second time period described above) raising, as the input voltage vin of power supply chip drops to zero, grid is led
The pressure that is powered VGH can be also gradually reduced, even if the signal Xon of trigger signal generation unit output is low level signal, and electronic cutting
It closes work and also needs to power supply chip as the corresponding voltage of other termination (such as source electrode and drain electrode) offer, due to power supply chip no longer work
Make, which also no longer works, and therefore, which only can improve gate-on voltage within the short time of shutdown
VGH avoids screen from ON/OFF scintillations occur.
The embodiment of the present invention also provides a kind of liquid crystal display device, including described in power supply chip and any of the above-described embodiment
Driving circuit, the Input voltage terminal of the power supply chip are connect with the driving circuit, the gate turn-on electricity of the power supply chip
Pressure output terminal is connect with the driving circuit.
The liquid crystal display device, including the driving circuit described in power supply chip and any of the above-described embodiment, power supply chip
Input voltage terminal is connect with driving circuit, and the gate-on voltage output terminal of power supply chip is connect with driving circuit, the drive
The trigger signal generation unit of dynamic circuit can judge liquid crystal display by the input voltage for the Input voltage terminal for detecting power supply chip
The off-mode of device, and then, trigger signal is generated, gate-on voltage control unit can control second according to the trigger signal
The gate-on voltage of the gate-on voltage, i.e. power supply chip of thin film transistor (TFT) in period in raising liquid crystal display device
The gate-on voltage raising of output terminal output, and then, in the second time period after the first time period at shutdown moment, it can make
The TFT gate conducting voltage VGH of pixel unit in liquid crystal display device is supplied to increase, therefore, gate-on voltage VGH is short
It will not decline immediately in time, but get a promotion in second time period, the pixel capacitance of pixel unit is enable to open completely
Electric discharge discharges the remaining charge of pixel capacitance, and extends discharge time completely, makes charge release more abundant, therefore, can
Charge residue phenomenon is avoided, so as to solve the screen flicker phenomenon of shutdown moment liquid crystal display device.
Those skilled in the art will readily occur to the present invention its after considering specification and putting into practice disclosure disclosed herein
Its embodiment.The present invention is directed to cover the present invention any variations, uses, or adaptations, these modifications, purposes or
Person's adaptive change follows the general principle of the present invention and including undocumented common knowledge in the art of the invention
Or conventional techniques.Description and embodiments are considered only as illustratively, and true scope and spirit of the invention are by following
Claim is pointed out.
It should be understood that the invention is not limited in the precision architecture for being described above and being shown in the drawings, and
And various modifications and changes may be made without departing from the scope thereof.The scope of the present invention is only limited by appended claim.
Claims (10)
1. a kind of driving method of liquid crystal display device, which is characterized in that including：
Trigger signal is generated after the first time period at liquid crystal display device shutdown moment；
The gate turn-on of the thin film transistor (TFT) in second time period in raising liquid crystal display device is controlled according to the trigger signal
Voltage.
2. driving method according to claim 1, which is characterized in that
The generation trigger signal after the first time period at liquid crystal display device shutdown moment includes：
After the input voltage for detecting liquid crystal display device drops to first voltage and more than before second voltage, generation is touched
It signals, the first voltage is more than second voltage, and the second voltage is equal to the under-voltage protection voltage of main control chip.
3. driving method according to claim 1, which is characterized in that described that second time was controlled according to the trigger signal
The gate-on voltage of thin film transistor (TFT) in section in raising liquid crystal display device, including：
It controls to increase in second time period by the trigger signal and flows through the partial pressure for being connected to gate-on voltage output terminal electricity
The electric current of resistance to increase the pressure drop of the divider resistance, increases the gate-on voltage.
4. driving method according to claim 3, which is characterized in that described that second time was controlled by the trigger signal
The electric current for the divider resistance for being connected to gate-on voltage output terminal is flowed through in increase in section, to increase the pressure of the divider resistance
Drop, including：
It controls to be connected in parallel on first resistor in second time period by the trigger signal and is connected to gate-on voltage output terminal
Divider resistance where in branch, the electric current of the divider resistance is flowed through with increase, branch where the divider resistance includes connecting
The divider resistance and second resistance being connected between gate-on voltage output terminal and ground terminal, in the divider resistance and described
Reference voltage end is connected between two resistance.
5. driving method according to claim 4, which is characterized in that described that second time was controlled by the trigger signal
In branch where first resistor to be connected in parallel on to the divider resistance for being connected to gate-on voltage output terminal in section, including：
The electronic switch connected by trigger signal control with the first resistor is closed in second time period, by institute
It states first resistor and the electronic switch is in parallel with the second resistance.
6. a kind of driving circuit of liquid crystal display device, which is characterized in that including：
Trigger signal generation unit, for generating trigger signal after the first time period at liquid crystal display device shutdown moment；
Gate-on voltage control unit increases liquid crystal display device for being controlled in second time period according to the trigger signal
In thin film transistor (TFT) gate-on voltage.
7. driving circuit according to claim 6, which is characterized in that
The Input voltage terminal of the trigger signal generation unit and liquid crystal display device connects, and the triggering generation unit is specifically used
In：After the input voltage for the Input voltage terminal for detecting liquid crystal display device drops to first voltage and more than second voltage
Before, trigger signal is generated, the first voltage is more than second voltage, and the second voltage is equal to the under-voltage protection of main control chip
Voltage.
8. driving circuit according to claim 6, which is characterized in that the gate-on voltage control unit, including：
Divider resistance is connected to gate-on voltage output terminal；
Voltage control unit is connect with the trigger signal generation unit, for controlling for the second time by the trigger signal
The electric current for the divider resistance for being connected to gate-on voltage output terminal is flowed through in increase in section, to increase the pressure of the divider resistance
Drop makes the gate-on voltage raising of the gate-on voltage output terminal output.
9. driving circuit according to claim 8, which is characterized in that the voltage control unit includes：
Second resistance, the second resistance and the divider resistance are connected between gate-on voltage output terminal and ground terminal,
Reference voltage end is connected between the divider resistance and the second resistance；
, the electricity in parallel with the second resistance after first resistor and switch, the first resistor and electronic switch series connection
Sub switch is connect with the trigger signal generation unit, and the electronic switch is after the trigger signal is received in the second time
It is closed in section.
10. a kind of liquid crystal display device, which is characterized in that driven including power supply chip and claim 6-9 any one of them
Circuit, the Input voltage terminal of the power supply chip are connect with the driving circuit, and the gate-on voltage of the power supply chip is defeated
Outlet is connect with the driving circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810012256.2A CN108231022B (en) | 2018-01-05 | 2018-01-05 | Driving circuit and driving method of liquid crystal display device and liquid crystal display device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810012256.2A CN108231022B (en) | 2018-01-05 | 2018-01-05 | Driving circuit and driving method of liquid crystal display device and liquid crystal display device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108231022A true CN108231022A (en) | 2018-06-29 |
| CN108231022B CN108231022B (en) | 2020-11-10 |
Family
ID=62643245
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810012256.2A Expired - Fee Related CN108231022B (en) | 2018-01-05 | 2018-01-05 | Driving circuit and driving method of liquid crystal display device and liquid crystal display device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108231022B (en) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108877710A (en) * | 2018-07-03 | 2018-11-23 | 京东方科技集团股份有限公司 | Grid on-state voltage provides unit, method, display driving mould group and display device |
| CN108986767A (en) * | 2018-07-13 | 2018-12-11 | 京东方科技集团股份有限公司 | Clock signal auxiliary circuit, display device |
| CN110120206A (en) * | 2019-06-27 | 2019-08-13 | 南京中电熊猫平板显示科技有限公司 | On-state voltage generative circuit, displaying panel driving method and display panel |
| CN110910809A (en) * | 2019-11-25 | 2020-03-24 | Tcl华星光电技术有限公司 | Drive circuit and display device |
| CN111667785A (en) * | 2020-07-07 | 2020-09-15 | 京东方科技集团股份有限公司 | Control circuit, Tcon board and display device |
| CN113160730A (en) * | 2021-04-07 | 2021-07-23 | Tcl华星光电技术有限公司 | Drive circuit and display device |
| CN113192449A (en) * | 2021-04-16 | 2021-07-30 | 惠科股份有限公司 | Display panel driving circuit and driving method |
| 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 |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57138620A (en) * | 1981-02-23 | 1982-08-27 | Hitachi Ltd | Liquid crystal display element |
| CN201845535U (en) * | 2010-10-25 | 2011-05-25 | 上海派锋实业有限公司 | LCD device |
| CN103295537A (en) * | 2013-05-08 | 2013-09-11 | 深圳市华星光电技术有限公司 | LED backlight driving circuit, backlight module and liquid crystal display device |
| US20130265509A1 (en) * | 2012-04-04 | 2013-10-10 | Suk Choi | Liquid crystal lens panel and steroscopic image display panel having the same |
| CN104123924A (en) * | 2014-05-14 | 2014-10-29 | 友达光电股份有限公司 | Liquid crystal display and grid discharge control circuit thereof |
| CN105913828A (en) * | 2016-07-05 | 2016-08-31 | 京东方科技集团股份有限公司 | Residual shadow elimination circuit, grid drive circuit and display device |
-
2018
- 2018-01-05 CN CN201810012256.2A patent/CN108231022B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57138620A (en) * | 1981-02-23 | 1982-08-27 | Hitachi Ltd | Liquid crystal display element |
| CN201845535U (en) * | 2010-10-25 | 2011-05-25 | 上海派锋实业有限公司 | LCD device |
| US20130265509A1 (en) * | 2012-04-04 | 2013-10-10 | Suk Choi | Liquid crystal lens panel and steroscopic image display panel having the same |
| CN103295537A (en) * | 2013-05-08 | 2013-09-11 | 深圳市华星光电技术有限公司 | LED backlight driving circuit, backlight module and liquid crystal display device |
| CN104123924A (en) * | 2014-05-14 | 2014-10-29 | 友达光电股份有限公司 | Liquid crystal display and grid discharge control circuit thereof |
| CN105913828A (en) * | 2016-07-05 | 2016-08-31 | 京东方科技集团股份有限公司 | Residual shadow elimination circuit, grid drive circuit and display device |
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10832628B2 (en) | 2018-07-03 | 2020-11-10 | Chongqing Boe Optoelectronics Technology Co., Ltd. | Gate on-state voltage supply unit, gate on-state voltage supply method, display driving module and display device |
| CN108877710A (en) * | 2018-07-03 | 2018-11-23 | 京东方科技集团股份有限公司 | Grid on-state voltage provides unit, method, display driving mould group and display device |
| CN108986767A (en) * | 2018-07-13 | 2018-12-11 | 京东方科技集团股份有限公司 | Clock signal auxiliary circuit, display device |
| CN110120206A (en) * | 2019-06-27 | 2019-08-13 | 南京中电熊猫平板显示科技有限公司 | On-state voltage generative circuit, displaying panel driving method and display panel |
| CN110910809A (en) * | 2019-11-25 | 2020-03-24 | Tcl华星光电技术有限公司 | Drive circuit and display device |
| CN111667785B (en) * | 2020-07-07 | 2023-11-14 | 京东方科技集团股份有限公司 | Control circuit, Tcon board and display device |
| CN111667785A (en) * | 2020-07-07 | 2020-09-15 | 京东方科技集团股份有限公司 | Control circuit, Tcon board and display device |
| CN113160730A (en) * | 2021-04-07 | 2021-07-23 | Tcl华星光电技术有限公司 | Drive circuit and display device |
| WO2022213416A1 (en) * | 2021-04-07 | 2022-10-13 | Tcl华星光电技术有限公司 | Drive circuit and display device |
| US11908359B2 (en) | 2021-04-07 | 2024-02-20 | Tcl China Star Optoelectronics Technology Co., Ltd. | Driving circuit and display device |
| CN113192449B (en) * | 2021-04-16 | 2022-05-06 | 惠科股份有限公司 | Display panel driving circuit and driving method |
| CN113192449A (en) * | 2021-04-16 | 2021-07-30 | 惠科股份有限公司 | Display panel driving circuit and driving method |
| 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108231022B (en) | 2020-11-10 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108231022A (en) | Driving circuit and driving method, the liquid crystal display device of liquid crystal display device | |
| CN102867491B (en) | LCD (Liquid Crystal Display) panel drive circuit and method as well as display unit | |
| US8976164B2 (en) | Circuit for eliminating shutdown afterimages of a display device | |
| US8558823B2 (en) | Liquid crystal display and gate modulation method thereof | |
| CN101604515B (en) | Discharge circuit and display device with the same | |
| CN104464673B (en) | Display device and its control method, circuit | |
| CN101527120A (en) | Method of driving a light source, light source device for performing the same, and display device having the light source device | |
| US20060289893A1 (en) | Display device and driving apparatus having reduced pixel electrode discharge time upon power cut-off | |
| CN104361866A (en) | Driving device and driving method of display panel and display device | |
| CN107610666A (en) | Eliminate the circuit and method of power-off ghost shadow | |
| KR20080024400A (en) | Voltage generating circuit and display apparatus having the same | |
| CN107103888B (en) | Time sequence driving circuit, driving circuit and the liquid crystal display panel of liquid crystal display panel | |
| CN109064985B (en) | Overcurrent protection circuit and display device | |
| CN1953030A (en) | Control circuit device and liquid crystal display with the same | |
| CN108962165A (en) | A kind of circuit and method for eliminating IGZO display panel power down ghost | |
| TW201117178A (en) | Gate driver and operating method thereof | |
| CN108877710A (en) | Grid on-state voltage provides unit, method, display driving mould group and display device | |
| CN209070958U (en) | Public electrode voltages generation circuit and display device | |
| CN114578602A (en) | Control circuit, data driving chip and liquid crystal display device | |
| CN107317476B (en) | Output voltage adjustment circuit and liquid crystal display device | |
| CN109785811A (en) | A kind of common voltage provides circuit, liquid crystal display panel and its driving method | |
| CN212570354U (en) | Liquid crystal display module discharge circuit | |
| CN109215605A (en) | Driving circuit, driving device, display device and its driving method | |
| CN211181608U (en) | Power supply time sequence control circuit and display device | |
| CN108364616A (en) | Array substrate, display panel, display device and its driving method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20201110 Termination date: 20220105 |
|
| CF01 | Termination of patent right due to non-payment of annual fee |