CN107516503A - Liquid crystal panel drive circuit and liquid crystal panel drive method - Google Patents
Liquid crystal panel drive circuit and liquid crystal panel drive method Download PDFInfo
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- CN107516503A CN107516503A CN201710949427.XA CN201710949427A CN107516503A CN 107516503 A CN107516503 A CN 107516503A CN 201710949427 A CN201710949427 A CN 201710949427A CN 107516503 A CN107516503 A CN 107516503A
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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
- G09G3/3611—Control of matrices with row and column drivers
- G09G3/3696—Generation of voltages supplied to electrode drivers
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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
- G09G2320/00—Control of display operating conditions
- G09G2320/02—Improving the quality of display appearance
- G09G2320/0257—Reduction of after-image effects
Abstract
The present invention provides a kind of liquid crystal panel drive circuit and liquid crystal panel drive method.The liquid crystal panel drive circuit includes level conversion unit, power supply unit, the first partial pressure unit, the second partial pressure unit, the first electric capacity and switch module；During normal work, power supply unit is to the first partial pressure unit and switch element output services voltage, powered after the first partial pressure unit partial pressure for level conversion unit, level conversion unit carries out input grounding terminal voltage the output ground connection terminal voltage of output low potential after level conversion, second end of the first electric capacity and earth terminal are electrically connected with by switch module, eliminate the ripple of output ground connection terminal voltage；During shutdown, power supply unit exports shutdown voltage to the first partial pressure unit and switch module, switch module disconnects the second end of the first electric capacity and earth terminal, level conversion unit is exported earth terminal voltage high to constant pressure high voltage is exported to liquid crystal panel, and effectively improves the power-off ghost shadow of liquid crystal panel.
Description
Technical field
The present invention relates to technical field of liquid crystal display, more particularly to a kind of liquid crystal panel drive circuit and liquid crystal panel driving
Method.
Background technology
Liquid crystal display device (Liquid Crystal Display, LCD) has thin fuselage, power saving, radiationless etc. numerous
Advantage, it is widely used, such as：LCD TV, mobile phone, personal digital assistant (PDA), digital camera, computer
Screen or notebook computer screen etc., occupy an leading position in flat display field.
In active liquid crystal display device, each pixel is electrically connected with a thin film transistor (TFT) (TFT), thin film transistor (TFT)
Grid (Gate) is connected to horizontal scanning line, and source electrode (Source) is connected to the data wire of vertical direction, and drain electrode (Drain) then connects
It is connected to pixel electrode.Apply enough voltage on horizontal scanning line, can be electrically connected on this horizontal scanning line
All TFT are opened, so as to the signal voltage on data wire can writing pixel, control light transmittance and then the control of different liquid crystal
Color processed and the effect of brightness.
With the continuous development of liquid crystal display device industry manufacturing technology, using array process by gated sweep drive circuit
(Gate Driver on Array, GOA) is directly produced on thin-film transistor array base-plate to substitute external gated sweep
The technologies such as driving IC turn into the Hot Contents that numerous liquid crystal panel manufacturers fall over each other exploitation, further to reduce production cost.GOA skills
Gate driving circuit can be produced on tft array substrate by art with the array process of liquid crystal panel, be realized to grid line by line
The type of drive of scanning.
Referring to Fig. 1, be a kind of existing circuit diagram of liquid crystal panel drive circuit, the liquid crystal display panel drive circuit
Including level conversion unit 100 ', power supply unit 200 ', first resistor R10, second resistance R20, the first electric capacity C10 and second
Electric capacity C20, wherein, the first input end access input grounding terminal voltage VSS_I of level conversion unit 100 ', the second input electricity
Property connection first resistor R10 the second end, output end is electrically connected with liquid crystal panel 300 '；The output end of power supply unit 200 ' is electrical
Connect first resistor R10 first end；First resistor R10 the second end is electrically connected with second resistance R20 first end；Second electricity
Hinder R20 the second end ground connection；First electric capacity C10 first end is electrically connected with the output end of level conversion unit 100 ', the second end
Ground connection；Second electric capacity C20 first end is electrically connected with the output end of level conversion unit 100 ', the second end ground connection, utilizes the liquid
Crystal face drive circuit drive liquid crystal panel 300 ' when, in normal work, power supply unit 200 ' to first resistor R10 first
Input service voltage (generally 10.8-13V) is held, output to level conversion unit 100 ' is it after first resistor R10 partial pressures
Power supply makes its normal work, and level conversion unit 100 ' is carried out after level conversion to input grounding terminal voltage VSS_I to liquid crystal surface
Plate 300 ' exports the output ground connection terminal voltage VSS_O of low potential, the grid of the TFT in the pixel region of liquid crystal panel 300 ' is locked in defeated
Go out to be grounded on terminal voltage VSS_O, in shutdown, power supply unit 200 ' inputs shutdown voltage to first resistor R10 first end, should
Shutdown voltage is less than operating voltage (being typically less than 10V), and now shutdown voltage incoming level after first resistor R10 partial pressures turns
The second input of unit 100 ' is changed, now, level conversion unit 100 ' performs and connects the output exported to liquid crystal panel 300 '
Ground terminal voltage VSS_O is drawn high to constant pressure high voltage (VGH) action, it is therefore an objective to is made in shutdown moment in the pixel of liquid crystal panel 300 '
TFT open pixel region is discharged, eliminate power-off ghost shadow；It is to protect to set the first electric capacity C10 and the second electric capacity C20 purpose
It is stable that the output ground connection terminal voltage VSS_O of liquid crystal panel 300 ' is input to when demonstrate,proving normal work, reduces output ground connection terminal voltage
VSS_O ripple (ripple), however, due to the first electric capacity C10 and the second electric capacity C20 setting, it can make in shutdown, level
The output ground connection terminal voltage VSS_O that converting unit 100 ' is input to liquid crystal panel 300 ' is unable to reach constant pressure high voltage (general
4V can be reached) so that the TFT in liquid crystal panel 300 ' can not be opened completely, cause power-off ghost shadow.
The content of the invention
It is an object of the invention to provide a kind of liquid crystal panel drive circuit, the shutdown that can be effectively improved liquid crystal panel is residual
Shadow.
Another object of the present invention is to provide a kind of liquid crystal panel drive method, the pass of liquid crystal panel can be effectively improved
Machine ghost.
To achieve the above object, present invention firstly provides a kind of liquid crystal panel drive circuit, including level conversion unit, confession
Electric unit, the first partial pressure unit, the second partial pressure unit, the first electric capacity and switch module；The first of the level conversion unit is defeated
Enter to terminate into input grounding terminal voltage, output end is electrically connected with liquid crystal panel, and the second input is electrically connected with the first partial pressure unit
The second end；The output end of said supply unit is electrically connected with the first end of the first partial pressure unit；First partial pressure unit
Second end is electrically connected with the first end of the second partial pressure unit；The second of second partial pressure unit is terminated into earth terminal；Described
The first end of one electric capacity is electrically connected with the output end of level conversion unit, and the second end is electrically connected with switch module；The switching molding
Block is electrically connected with the output end of power supply unit, and accesses earth terminal；
Said supply unit is used for output services voltage or shutdown voltage；In said supply unit output services voltage,
The switch module receives operating voltage and is electrically connected with the second end of the first electric capacity and earth terminal；It is defeated in said supply unit
When going out shutdown voltage, the switch module receives shutdown voltage and disconnects the second end of the first electric capacity and earth terminal；
The level conversion unit is used to input grounding terminal voltage is entered into line level in power supply unit output services voltage
Conversion, the output for exporting low potential is grounded terminal voltage to liquid crystal panel, when power supply unit exports shutdown voltage, by output to liquid
The output earth terminal voltage high of crystal panel is to constant pressure high voltage.
The switch module includes the 3rd partial pressure unit, the 4th partial pressure unit and the first N-type switch element；
The first end of 3rd partial pressure unit is electrically connected with the output end of power supply unit, and the second end is electrically connected with the 4th point
Press the first end of unit；The second of 4th partial pressure unit is terminated into earth terminal；The control terminal of the first N-type switch element
The second end of the 3rd partial pressure unit is electrically connected with, first end access earth terminal, the second end is electrically connected with the second end of the first electric capacity.
In said supply unit output services voltage, the second end of the 3rd partial pressure unit is high potential, the first N-type
Switching means conductive, the second end of the first electric capacity and earth terminal are electrically connected with；When said supply unit exports shutdown voltage,
Second end of the 3rd partial pressure unit is low potential, the cut-off of the first N-type switch element, by the second end of the first electric capacity and is grounded
End disconnects.
Also include, the second electric capacity, the output end of the first end electric connection level conversion unit of second electric capacity, second
End is electrically connected with switch module；
In said supply unit output services voltage, the switch module receives operating voltage by the of the second electric capacity
Two ends are electrically connected with earth terminal；When said supply unit exports shutdown voltage, the switch module receives shutdown voltage
Second end of the second electric capacity and earth terminal are disconnected.
The switch module also includes the second N-type switch element；The control terminal of the second N-type switch element is electrically connected with
Second end of the 3rd partial pressure unit, first end access earth terminal, the second end is electrically connected with the second end of the second electric capacity.
In said supply unit output services voltage, the second end of the 3rd partial pressure unit is high potential, the second N-type
Switching means conductive, the second end of the second electric capacity and earth terminal are electrically connected with；When said supply unit exports shutdown voltage,
Second end of the 3rd partial pressure unit is low potential, the cut-off of the second N-type switch element, by the second end of the second electric capacity and is grounded
End disconnects.
First partial pressure unit, the second partial pressure unit, the 3rd partial pressure unit and the 4th partial pressure unit are respectively the first electricity
Resistance, second resistance, 3rd resistor and the 4th resistance；
The first N-type switch element is the first N-type FET, and the grid of the first N-type FET is the first N
The control terminal of type switch element, source electrode are the first end of the first N-type switch element, are drained as the second of the first N-type switch element
End.
The second N-type switch element is the second N-type FET, and the grid of the second N-type FET is the 2nd N
The control terminal of type switch element, source electrode are the first end of the second N-type switch element, are drained as the second of the second N-type switch element
End.
The magnitude of voltage of the operating voltage is 10.8-13V；
The magnitude of voltage of the shutdown voltage is less than 10V.
The present invention also provides a kind of liquid crystal panel drive method, applied to above-mentioned liquid crystal panel drive circuit, including such as
Lower step：
Step S1, power supply unit output services voltage, the switch module receive operating voltage by the second of the first electric capacity
End is electrically connected with earth terminal, and operating voltage is exported to level conversion unit, level conversion list after the first partial pressure unit partial pressure
Member carries out level conversion to input grounding terminal voltage, and the output for exporting low potential is grounded terminal voltage to liquid crystal panel；
Step S2, power supply unit output shutdown voltage, the switch module receive shutdown voltage by the second of the first electric capacity
End disconnects with earth terminal, and operating voltage exports after the first partial pressure unit partial pressure will to level conversion unit, level conversion unit
It is exported to the output earth terminal voltage high of liquid crystal panel to constant pressure high voltage.
Beneficial effects of the present invention：A kind of liquid crystal panel drive circuit provided by the invention, including level conversion unit, confession
Electric unit, the first partial pressure unit, the second partial pressure unit, the first electric capacity and switch module；During normal work, power supply unit is to
One partial pressure unit and switch module output services voltage, powered after the first partial pressure unit partial pressure for level conversion unit, level
Input grounding terminal voltage export after level conversion the output ground connection terminal voltage of low potential by converting unit, and switch module is by the
Second end of one electric capacity is electrically connected with earth terminal, eliminates the ripple of output ground connection terminal voltage；During shutdown, power supply unit is to first
Partial pressure unit and switch module output shutdown voltage, switch module disconnect the second end of the first electric capacity and earth terminal, and level turns
Change unit and exported earth terminal voltage high to constant pressure high voltage is exported to liquid crystal panel, effectively improve the pass of liquid crystal panel
Machine ghost.A kind of liquid crystal panel drive method provided by the invention, can be effective applied to above-mentioned liquid crystal panel drive circuit
Improve the power-off ghost shadow of liquid crystal panel.
Brief description of the drawings
In order to be further understood that the feature of the present invention and technology contents, refer to below in connection with the detailed of the present invention
Illustrate and accompanying drawing, however accompanying drawing only provide with reference to and explanation use, be not used for being any limitation as the present invention.
In accompanying drawing,
Fig. 1 is a kind of existing circuit diagram of liquid crystal panel drive circuit；
Fig. 2 is the circuit diagram of the liquid crystal panel drive circuit of the present invention；
Fig. 3 is the flow chart of the liquid crystal panel drive method of the present invention.
Embodiment
Further to illustrate the technological means and its effect of the invention taken, below in conjunction with being preferable to carry out for the present invention
Example and its accompanying drawing are described in detail.
Referring to Fig. 2, the present invention provides a kind of liquid crystal panel drive circuit, including level conversion unit 100, power supply unit
200th, the first partial pressure unit 300, the second partial pressure unit 400, the first electric capacity C1 including level conversion unit 100, power supply unit
200th, the first partial pressure unit 300, the second partial pressure unit 400, the first electric capacity C1 and switch module 500；
The first input end access input grounding terminal voltage VSS_I of the level conversion unit 100, output end are electrically connected with
Liquid crystal panel 10, the second input are electrically connected with the second end of the first partial pressure unit 300；The output end of said supply unit 200
It is electrically connected with the first end of the first partial pressure unit 300；Second end of first partial pressure unit 300 is electrically connected with the second partial pressure list
The first end of member 400；The second of second partial pressure unit 400 is terminated into earth terminal；The first end electricity of the first electric capacity C1
Property connection level conversion unit 100 output end, the second end be electrically connected with switch module 500；The switch module 500 electrically connects
The output end of power supply unit 200 is connect, and accesses earth terminal；
Said supply unit 200 is used for output services voltage or shutdown voltage；In the output services of said supply unit 200 electricity
During pressure, the switch module 500 receives operating voltage and is electrically connected with the first electric capacity C1 the second end and earth terminal；Described
Power supply unit 200 export shutdown voltage when, the switch module 500 receive shutdown voltage by the first electric capacity C1 the second end with
Earth terminal disconnects；
The level conversion unit 100 is used for input grounding terminal voltage in 200 output services voltage of power supply unit
VSS_I carries out level conversion, and the output for exporting low potential is grounded terminal voltage VSS_O to liquid crystal panel 10, defeated in power supply unit 200
When going out shutdown voltage, the output ground connection terminal voltage VSS_O exported to liquid crystal panel 10 is drawn high to constant pressure high voltage.
Specifically, the switch module 500 is opened including the 3rd partial pressure unit 510, the 4th partial pressure unit 520 and the first N-type
Close unit 530；
The first end of 3rd partial pressure unit 510 is electrically connected with the output end of power supply unit 200, and the second end is electrically connected with
The first end of 4th partial pressure unit 520；The second of 4th partial pressure unit 520 is terminated into earth terminal；The first N-type switch
The control terminal of unit 530 is electrically connected with the second end of the 3rd partial pressure unit 510, and first end access earth terminal, the second end electrically connects
Connect the first electric capacity C1 the second end.
Specifically, in 200 output services voltage of said supply unit, the second end of the 3rd partial pressure unit 510 is
High potential, the first N-type switch element 530 are turned on, and the first electric capacity C1 the second end and earth terminal are electrically connected with；In the power supply
When unit 200 exports shutdown voltage, the second end of the 3rd partial pressure unit 510 is low potential, the first N-type switch element 530
Cut-off, the first electric capacity C1 the second end and earth terminal are disconnected.
It should be noted that the course of work of the liquid crystal panel drive circuit of the present invention is as follows：
First, in normal state, first end input service electricity of the said supply unit 200 to the first partial pressure unit 300
Pressure, the operating voltage transports to level conversion unit 100 after the partial pressure of the first partial pressure unit 300 makes its normal work for its power supply
Make, level conversion unit 100 carries out level conversion to input grounding terminal voltage VSS_I, exports the output earth terminal electricity of low potential
Pressing VSS_O, at the same time, power supply unit 200 is also to the output services voltage of switch module 500, operating voltage to liquid crystal panel 10
After the partial pressure of the 3rd partial pressure unit 510, the second end for making the 3rd partial pressure unit 510 is high potential, makes the first N-type switch element
530 conductings, the first electric capacity C1 the second end ground connection, are exported so as to the first electric capacity C1 to the output end of level conversion unit 100
Output ground connection terminal voltage VSS_O carries out the elimination of ripple, eliminates the ground connection of the output after ripple terminal voltage VSS_O and inputs to liquid crystal
In panel 10, it ensure that input is stable to the output ground connection terminal voltage VSS_O in liquid crystal panel 10；
Afterwards, in shutdown, said supply unit 200 inputs shutdown voltage to the first end of the first partial pressure unit 300, should
Shutdown voltage is less than operating voltage, the incoming level converting unit 100 after the partial pressure of the first partial pressure unit 300, now, level conversion
The output ground connection terminal voltage VSS_O that unit 100 outputs this to liquid crystal panel 10 is drawn high to constant pressure high voltage, at the same time, is supplied
Electric unit 200 also exports shutdown voltage to switch element 500, and shutdown voltage makes the 3rd point after the partial pressure of the 3rd partial pressure unit 510
The second end for pressing unit 510 is low potential, ends the first N-type switch element 530, the first electric capacity C1 the second end and earth terminal
Disconnect and be empty, it is constant pressure high potential to ensure that input to the output in liquid crystal panel 10 is grounded terminal voltage VSS_O, makes liquid crystal panel
TFT in 10 is opened completely, can effectively eliminate power-off ghost shadow.
Specifically, first partial pressure unit 300, the second partial pressure unit 400, the 3rd partial pressure unit 510 and the 4th partial pressure
Unit 520 is respectively first resistor R1, second resistance R2,3rd resistor R3 and the 4th resistance R4；
The first N-type switch element 530 is the first N-type FET Q1, the grid of the first N-type FET Q1
For the control terminal of the first N-type switch element 530, source electrode is the first end of the first N-type switch element 530, drains and is opened for the first N-type
Close the second end of unit 530.
Further, in order to strengthen the ability that liquid crystal panel drive circuit eliminates output ground connection terminal voltage VSS_O ripple,
The liquid crystal panel drive circuit also includes, and the second electric capacity C2, the second electric capacity C2 first end is electrically connected with level conversion
The output end of unit 100, the second end are electrically connected with switch module 500；
In 200 output services voltage of normal work namely said supply unit, the switch module 500 receives work
Second electric capacity C2 the second end and earth terminal are electrically connected with by voltage, namely the second electric capacity C2 is connected with first equal one end of electric capacity C1
The output end of level conversion unit 100, one end ground connection, output ground connection terminal voltage is eliminated so as to strengthen liquid crystal panel drive circuit
The ability of VSS_O ripple；When shutdown namely said supply unit 200 export shutdown voltage, the switch module 500 receives
The second electric capacity C2 the second end and earth terminal are disconnected to shutdown voltage, ensure input to the output earth terminal in liquid crystal panel 10
Voltage VSS_O is constant pressure high potential, the TFT in liquid crystal panel 10 is opened completely, can effectively eliminate power-off ghost shadow.
Specifically, the switch module 500 also includes the second N-type switch element 540；The second N-type switch element 540
Control terminal be electrically connected with the 3rd partial pressure unit 510 the second end, first end access earth terminal, the second end be electrically connected with second electricity
Hold C2 the second end.
Specifically, in 200 output services voltage of said supply unit, the second end of the 3rd partial pressure unit 510 is
High potential, the second N-type switch element 540 are turned on, and the second electric capacity C2 the second end and earth terminal are electrically connected with；In the power supply
When unit 200 exports shutdown voltage, the second end of the 3rd partial pressure unit 510 is low potential, the second N-type switch element 540
Cut-off, the second electric capacity C2 the second end and earth terminal are disconnected.
Specifically, the second N-type switch element 540 is the second N-type FET Q2, the second N-type FET
Q2 grid is the control terminal of the second N-type switch element 540, and source electrode is the first end of the second N-type switch element 540, and draining is
Second end of the second N-type switch element 540.
Preferably, the magnitude of voltage of the operating voltage is 10.8-13V；The magnitude of voltage of the shutdown voltage is less than 10V.
Referring to Fig. 3, and combine Fig. 2, based on same inventive concept, the present invention also provides a kind of liquid crystal panel driving side
Method, applied to above-mentioned liquid crystal panel drive circuit, comprise the following steps：
Step S1, work is received into normal operating conditions, the output services voltage of power supply unit 200, the switch module 500
Make voltage to be electrically connected with the first electric capacity C1 the second end and earth terminal, operating voltage is defeated after the partial pressure of the first partial pressure unit 300
Go out to level conversion unit 100, level conversion unit 100 and level conversion is carried out to input grounding terminal voltage VSS_I, exports low electricity
The output of position is grounded terminal voltage VSS_O to liquid crystal panel 10.
Specifically, in normal state, first end input service of the said supply unit 200 to the first partial pressure unit 300
Voltage, the operating voltage transports to level conversion unit 100 after the partial pressure of the first partial pressure unit 300 makes its normal work for its power supply
Make, level conversion unit 100 carries out level conversion to input grounding terminal voltage VSS_I, exports the output earth terminal electricity of low potential
Pressing VSS_O, at the same time, power supply unit 200 is also to the output services voltage of switch module 500, operating voltage to liquid crystal panel 10
After the partial pressure of the 3rd partial pressure unit 510, the second end for making the 3rd partial pressure unit 510 is high potential, makes the first N-type switch element
530 conductings, the first electric capacity C1 the second end ground connection, are exported so as to the first electric capacity C1 to the output end of level conversion unit 100
Output ground connection terminal voltage VSS_O carries out the elimination of ripple, eliminates the ground connection of the output after ripple terminal voltage VSS_O and inputs to liquid crystal
In panel 10, it ensure that input is stable to the output ground connection terminal voltage VSS_O in liquid crystal panel 10.
Further, when the liquid crystal panel drive circuit also includes the second electric capacity C2, the is also included in switch module 500
During two N-type switch elements 540, in the step S1, the switch module 500 is also by the second electric capacity C2 the second end and earth terminal
It is electrically connected with, specifically, the second end of the 3rd partial pressure unit 510 is high potential, turns on the second N-type switch element 540,
Second electric capacity C2 the second end and earth terminal are electrically connected with, namely the second electric capacity C2 is connected level with first equal one end of electric capacity C1
The output end of converting unit 100, one end ground connection, output ground connection terminal voltage VSS_O is eliminated so as to strengthen liquid crystal panel drive circuit
Ripple ability.
Step S2, into off-mode, power supply unit 200 exports shutdown voltage, and the switch module 500 receives shutdown electricity
Pressure disconnects the first electric capacity C1 the second end and earth terminal, and operating voltage is exported to level after the partial pressure of the first partial pressure unit 300
Converting unit 100, the output ground connection terminal voltage VSS_O that level conversion unit 100 outputs this to liquid crystal panel 10 are drawn high to perseverance
Press high voltage.
Specifically, in shutdown, said supply unit 200 inputs shutdown voltage to the first end of the first partial pressure unit 300,
The incoming level converting unit 100 after the partial pressure of the first partial pressure unit 300, now, level conversion unit 100 outputs this to liquid crystal
The output ground connection terminal voltage VSS_O of panel 10 is drawn high to constant pressure high voltage, and at the same time, power supply unit 200 is also to switch element
500 output shutdown voltages, for shutdown voltage after the partial pressure of the 3rd partial pressure unit 510, the second end for making the 3rd partial pressure unit 510 is low
Current potential, end the first N-type switch element 530, the first electric capacity C1 the second end disconnects and is empty with earth terminal, ensures input extremely
Output ground connection terminal voltage VSS_O in liquid crystal panel 10 is constant pressure high potential, the TFT in liquid crystal panel 10 is opened completely, energy
It is enough effectively to eliminate power-off ghost shadow.
Further, when the liquid crystal panel drive circuit also includes the second electric capacity C2, the is also included in switch module 500
During two N-type switch elements 540, in the step S2, the switch module 500 is also by the second electric capacity C2 the second end and earth terminal
Disconnect, specifically, the second end of the 3rd partial pressure unit 510 is low potential, end the second N-type switch element 540, by the
Two electric capacity C2 the second end disconnects with earth terminal, ensures that input to the output in liquid crystal panel 10 is grounded terminal voltage VSS_O as perseverance
High potential is pressed, the TFT in liquid crystal panel 10 is opened completely, can effectively eliminate power-off ghost shadow.
In summary, liquid crystal panel drive circuit of the invention, including level conversion unit, power supply unit, the first partial pressure
Unit, the second partial pressure unit, the first electric capacity and switch module；During normal work, power supply unit is to the first partial pressure unit and switch
Module output services voltage, powers after the first partial pressure unit partial pressure for level conversion unit, and level conversion unit connects input
Ground terminal voltage export after level conversion the output ground connection terminal voltage of low potential, switch module by the second end of the first electric capacity with
Earth terminal is electrically connected with, and eliminates the ripple of output ground connection terminal voltage；During shutdown, power supply unit is to the first partial pressure unit and switching molding
Block exports shutdown voltage, and switch module disconnects the second end of the first electric capacity and earth terminal, and level conversion unit will be exported and is grounded
Terminal voltage is drawn high to constant pressure high voltage and exported to liquid crystal panel, effectively improves the power-off ghost shadow of liquid crystal panel.The present invention's
Liquid crystal panel drive method, applied to above-mentioned liquid crystal panel drive circuit, the power-off ghost shadow of liquid crystal panel can be effectively improved.
It is described above, for the person of ordinary skill of the art, can be with technique according to the invention scheme and technology
Other various corresponding changes and deformation are made in design, and all these changes and deformation should all belong to the appended right of the present invention
It is required that protection domain.
Claims (10)
1. a kind of liquid crystal panel drive circuit, it is characterised in that including level conversion unit (100), power supply unit (200),
One partial pressure unit (300), the second partial pressure unit (400), the first electric capacity (C1) and switch module (500)；The level conversion list
The first input end access input grounding terminal voltage (VSS_I) of first (100), output end electric connection liquid crystal panel (10), second
Input is electrically connected with the second end of the first partial pressure unit (300)；The output end of said supply unit (200) is electrically connected with first
The first end of partial pressure unit (300)；Second end of first partial pressure unit (300) is electrically connected with the second partial pressure unit (400)
First end；The second of second partial pressure unit (400) is terminated into earth terminal；The first end of first electric capacity (C1) is electrical
The output end of level conversion unit (100) is connected, the second end is electrically connected with switch module (500)；Switch module (500) electricity
Property connection power supply unit (200) output end, and access earth terminal；
Said supply unit (200) is used for output services voltage or shutdown voltage；In said supply unit (200) output services electricity
During pressure, the switch module (500) receives operating voltage and is electrically connected with the second end of the first electric capacity (C1) and earth terminal；
When said supply unit (200) exports shutdown voltage, the switch module (500) receives shutdown voltage by the first electric capacity (C1)
The second end and earth terminal disconnect；
The level conversion unit (100) is used for input grounding terminal voltage in power supply unit (200) output services voltage
(VSS_I) level conversion is carried out, exports the output ground connection terminal voltage (VSS_O) to liquid crystal panel (10) of low potential, it is single in power supply
During first (200) output shutdown voltage, the output exported to liquid crystal panel (10) is grounded terminal voltage (VSS_O) and drawn high to constant pressure height
Voltage.
2. liquid crystal panel drive circuit as claimed in claim 1, it is characterised in that the switch module (500) includes the 3rd
Partial pressure unit (510), the 4th partial pressure unit (520) and the first N-type switch element (530)；
The first end of 3rd partial pressure unit (510) is electrically connected with the output end of power supply unit (200), and the second end is electrically connected with
The first end of 4th partial pressure unit (520)；The second of 4th partial pressure unit (520) is terminated into earth terminal；First N-type
Second end of control terminal the 3rd partial pressure unit (510) of electric connection of switch element (530), first end access earth terminal, second
End is electrically connected with the second end of the first electric capacity (C1).
3. liquid crystal panel drive circuit as claimed in claim 2, it is characterised in that export work in said supply unit (200)
When making voltage, the second end of the 3rd partial pressure unit (510) is high potential, the conducting of the first N-type switch element (530), by the
Second end of one electric capacity (C1) is electrically connected with earth terminal；When said supply unit (200) exports shutdown voltage, the described 3rd
Second end of partial pressure unit (510) is low potential, and the first N-type switch element (530) ends, by the second end of the first electric capacity (C1)
Disconnected with earth terminal.
4. liquid crystal panel drive circuit as claimed in claim 2, it is characterised in that also include, the second electric capacity (C2), described
The first end of two electric capacity (C2) is electrically connected with the output end of level conversion unit (100), and the second end is electrically connected with switch module
(500)；
In said supply unit (200) output services voltage, the switch module (500) receives operating voltage by the second electricity
The second end and earth terminal for holding (C2) are electrically connected with；When said supply unit (200) exports shutdown voltage, the switch module
(500) shutdown voltage is received to disconnect the second end of the second electric capacity (C2) and earth terminal.
5. liquid crystal panel drive circuit as claimed in claim 4, it is characterised in that the switch module (500) also includes the
Two N-type switch elements (540)；The control terminal of the second N-type switch element (540) is electrically connected with the 3rd partial pressure unit (510)
The second end, first end access earth terminal, the second end be electrically connected with the second electric capacity (C2) the second end.
6. liquid crystal panel drive circuit as claimed in claim 5, it is characterised in that export work in said supply unit (200)
When making voltage, the second end of the 3rd partial pressure unit (510) is high potential, the conducting of the second N-type switch element (540), by the
Second end of two electric capacity (C2) is electrically connected with earth terminal；When said supply unit (200) exports shutdown voltage, the described 3rd
Second end of partial pressure unit (510) is low potential, and the second N-type switch element (540) ends, by the second end of the second electric capacity (C2)
Disconnected with earth terminal.
7. liquid crystal panel drive circuit as claimed in claim 2, it is characterised in that first partial pressure unit (300), second
Partial pressure unit (400), the 3rd partial pressure unit (510) and the 4th partial pressure unit (520) are respectively first resistor (R1), the second electricity
Hinder (R2), 3rd resistor (R3) and the 4th resistance (R4)；
The first N-type switch element (530) is the first N-type FET (Q1), the grid of the first N-type FET (Q1)
The extremely control terminal of the first N-type switch element (530), source electrode are the first end of the first N-type switch element (530), are drained as the
Second end of one N-type switch element (530).
8. liquid crystal panel drive circuit as claimed in claim 5, it is characterised in that the second N-type switch element (540) is
Second N-type FET (Q2), the grid of the second N-type FET (Q2) are the control of the second N-type switch element (540)
End, source electrode are the first end of the second N-type switch element (540), are drained as the second end of the second N-type switch element (540).
9. liquid crystal panel drive circuit as claimed in claim 1, it is characterised in that the magnitude of voltage of the operating voltage is
10.8-13V；
The magnitude of voltage of the shutdown voltage is less than 10V.
10. a kind of liquid crystal panel drive method, it is characterised in that applied to the liquid crystal surface as described in claim any one of 1-9
Drive circuit, comprise the following steps：
Step S1, power supply unit (200) output services voltage, the switch module (500) receive operating voltage by the first electric capacity
(C1) the second end is electrically connected with earth terminal, and operating voltage is exported to level conversion after the first partial pressure unit (300) partial pressure
Unit (100), level conversion unit (100) carry out level conversion to input grounding terminal voltage (VSS_I), export the defeated of low potential
Go out to be grounded terminal voltage (VSS_O) to liquid crystal panel (10)；
Step S2, power supply unit (200) output shutdown voltage, the switch module (500) receive shutdown voltage by the first electric capacity
(C1) the second end is disconnected with earth terminal, and operating voltage is exported to level conversion unit after the first partial pressure unit (300) partial pressure
(100), level conversion unit (100) output this to liquid crystal panel (10) output ground connection terminal voltage (VSS_O) draw high to perseverance
Press high voltage.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710949427.XA CN107516503B (en) | 2017-10-12 | 2017-10-12 | Liquid crystal panel driving circuit and liquid crystal panel driving method |
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|---|---|---|---|
| CN201710949427.XA CN107516503B (en) | 2017-10-12 | 2017-10-12 | Liquid crystal panel driving circuit and liquid crystal panel driving method |
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| CN107516503B CN107516503B (en) | 2020-01-31 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110599977A (en) * | 2019-09-18 | 2019-12-20 | 福州京东方光电科技有限公司 | Shutdown ghost eliminating circuit and display device |
| CN110706672A (en) * | 2019-09-25 | 2020-01-17 | 武汉华星光电半导体显示技术有限公司 | Drive circuit and display panel |
| CN110930958A (en) * | 2019-11-26 | 2020-03-27 | Tcl华星光电技术有限公司 | Shutdown ghost eliminating circuit, array substrate and display device |
| CN111028807A (en) * | 2019-12-24 | 2020-04-17 | Tcl华星光电技术有限公司 | Driving circuit and driving method of liquid crystal display panel |
| WO2020134948A1 (en) * | 2018-12-24 | 2020-07-02 | 惠科股份有限公司 | Control circuit and display device |
| WO2020215450A1 (en) * | 2019-04-23 | 2020-10-29 | 深圳市华星光电技术有限公司 | Voltage conversion circuit |
| CN112185314A (en) * | 2020-10-19 | 2021-01-05 | Tcl华星光电技术有限公司 | Voltage conversion circuit and display device |
| CN113205783A (en) * | 2021-04-25 | 2021-08-03 | 成都中电熊猫显示科技有限公司 | Control apparatus for display device and control method for level conversion module |
| WO2022111089A1 (en) * | 2020-11-27 | 2022-06-02 | 京东方科技集团股份有限公司 | Level conversion circuit, display panel drive circuit, and display apparatus |
| CN115312011A (en) * | 2022-04-26 | 2022-11-08 | 友达光电股份有限公司 | Pixel circuit and power supply method of shutdown power supply sequence thereof |
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| CN110930958A (en) * | 2019-11-26 | 2020-03-27 | Tcl华星光电技术有限公司 | Shutdown ghost eliminating circuit, array substrate and display device |
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| CN113205783A (en) * | 2021-04-25 | 2021-08-03 | 成都中电熊猫显示科技有限公司 | Control apparatus for display device and control method for level conversion module |
| CN115312011A (en) * | 2022-04-26 | 2022-11-08 | 友达光电股份有限公司 | Pixel circuit and power supply method of shutdown power supply sequence thereof |
| CN115312011B (en) * | 2022-04-26 | 2023-10-24 | 友达光电股份有限公司 | Pixel circuit and power supply method of shutdown power supply sequence thereof |
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Address after: 9-2 Tangming Avenue, Guangming New District, Shenzhen City, Guangdong Province Patentee after: TCL Huaxing Photoelectric Technology Co.,Ltd. Address before: 9-2 Tangming Avenue, Guangming New District, Shenzhen City, Guangdong Province Patentee before: Shenzhen China Star Optoelectronics Technology Co.,Ltd. |
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