CN110349549A - Driving method, driving circuit and the display device of liquid crystal display panel - Google Patents
Driving method, driving circuit and the display device of liquid crystal display panel Download PDFInfo
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- CN110349549A CN110349549A CN201910645668.4A CN201910645668A CN110349549A CN 110349549 A CN110349549 A CN 110349549A CN 201910645668 A CN201910645668 A CN 201910645668A CN 110349549 A CN110349549 A CN 110349549A
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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
- G09G3/3607—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 for displaying colours or for displaying grey scales with a specific pixel layout, e.g. using sub-pixels
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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
- G09G2320/0271—Adjustment of the gradation levels within the range of the gradation scale, e.g. by redistribution or clipping
Abstract
The present invention provides a kind of driving method of liquid crystal display panel, driving circuit and display devices, belong to field of display technology.Wherein, the driving method of liquid crystal display panel, it include: to send common electrode signal to the public electrode wire of the liquid crystal display panel, overturn the public voltage signal passed through on the public electrode wire between the first common voltage and the second common voltage as unit of K frame, first common voltage and second common voltage relative to reference voltage polarity on the contrary, K is the integer greater than 1.Technical solution of the present invention can improve the colour gamut of display equipment, reduce circuit system dynamic power consumption, reduce EMI.
Description
Technical field
The present invention relates to field of display technology, particularly relate to the driving method of liquid crystal display panel a kind of, driving circuit and
Display device.
Background technique
In the liquid crystal display panel of the relevant technologies, need higher driving voltage that liquid crystal is driven to be overturn, due to number
Be not able to satisfy the requirement of driving voltage according to the data voltage transmitted on line, thus need using public voltage signal overturn by the way of come
Driving voltage is improved, the toggle frequency of public voltage signal is frame frequency, and consecutive frame can generate liquid crystal capacitance pole plate because of polarity upset
Voltage change is larger and causes the charge and discharge time longer, has compressed the lighting time, causes the colour gamut of liquid crystal display panel lower, and
And the overturning of public voltage signal will lead to circuit system dynamic power consumption it is higher, can also cause EMI to other electric signals
(Electro Magnetic Interference, electromagnetic interference).
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of driving method of liquid crystal display panel, driving circuit and displays
Device can improve the colour gamut of display equipment, reduce circuit system dynamic power consumption, reduce EMI.
In order to solve the above technical problems, the embodiment of the present invention offer technical solution is as follows:
On the one hand, a kind of driving method of liquid crystal display panel is provided, comprising:
Common electrode signal is sent to the public electrode wire of the liquid crystal display panel, makes to pass through on the public electrode wire
Public voltage signal overturn between the first common voltage and the second common voltage as unit of K frame, described first is public
Voltage and second common voltage relative to reference voltage polarity on the contrary, K is the integer greater than 1.
Optionally, the liquid crystal display panel includes the light source of M kind different colours, and K is equal to M.
Optionally, further includes:
When the common electrode signal sent to the public electrode wire is the first common voltage, to the pixel of pixel unit
Electrode inputs the first gray scale voltage；When the common electrode signal sent to the public electrode wire is the second common voltage, to
The pixel electrode of pixel unit inputs the second gray scale voltage, pole of first gray scale voltage relative to first common voltage
Property is opposite relative to the polarity of second common voltage with second gray scale voltage.
Optionally, the pixel unit includes the different first frame pixel of color, the second frame pixel and third frame pixel,
When the common electrode signal sent to the public electrode wire is the first common voltage, Xiang Suoshu first frame pixel, described the
Two frame pixels and the gray scale voltage of third frame pixel input are all the same relative to the polarity of reference voltage；To described public
When the common electrode signal that electrode wires are sent is the second common voltage, Xiang Suoshu first frame pixel, the second frame pixel and institute
The gray scale voltage for stating the input of third frame pixel is all the same relative to the polarity of reference voltage.
Optionally, the liquid crystal display panel is transparent display panel.
The embodiment of the invention also provides a kind of driving circuits of liquid crystal display panel, comprising:
Common electrode drive unit, for sending common electrode signal to the public electrode wire of the liquid crystal display panel,
Make the public voltage signal passed through on the public electrode wire as unit of K frame in the first common voltage and the second common voltage
Between overturn, first common voltage and second common voltage relative to reference voltage polarity on the contrary, K is greater than 1
Integer.
Optionally, the liquid crystal display panel includes the light source of M kind different colours, and K is equal to M.
Optionally, further includes:
Data drive unit, for being the first common voltage in the common electrode signal sent to the public electrode wire
When, the first gray scale voltage is inputted to the pixel electrode of pixel unit；In the common electrode signal sent to the public electrode wire
When for the second common voltage, input the second gray scale voltage to the pixel electrode of pixel unit, first gray scale voltage relative to
The polarity of first common voltage is opposite relative to the polarity of second common voltage with second gray scale voltage.
Optionally, the pixel unit includes the different first frame pixel of color, the second frame pixel and third frame pixel,
When the common electrode signal sent to the public electrode wire is the first common voltage, the data drive unit is to described the
The gray scale voltage of one frame pixel, the second frame pixel and third frame pixel input is homogeneous relative to the polarity of reference voltage
Together；When the common electrode signal sent to the public electrode wire is the second common voltage, the data drive unit is to institute
State polarity of the gray scale voltage of first frame pixel, the second frame pixel and third frame pixel input relative to reference voltage
It is all the same.
The embodiment of the invention also provides a kind of display devices, the driving electricity including liquid crystal display panel as described above
Road.
The embodiment of the present invention has the advantages that
In above scheme, the public voltage signal passed through on public electrode wire as unit of K frame the first common voltage with
And second overturn between common voltage, wherein K is the integer greater than 1, can reduce the frequency of public voltage signal overturning in this way
Rate, and then the time of liquid crystal capacitance charge and discharge can be reduced, charging quality is improved, the lighting time can be correspondingly increased, is improved
The colour gamut of display device subtracts in addition, the frequency for reducing public voltage signal overturning can also reduce the dynamic power consumption of circuit system
Small EMI.
Detailed description of the invention
Fig. 1 is the time diagram of FSC display pattern；
Fig. 2 is that public voltage signal overturns the schematic diagram synchronous with frame overturning in the related technology；
Fig. 3 is the schematic diagram of public voltage signal of embodiment of the present invention overturning；
Fig. 4 is the schematic diagram for the toggle frequency that the embodiment of the present invention controls COM generation circuit by FPGA；
Fig. 5 is the schematic diagram for the polarity upset signal POL that the embodiment of the present invention controls source driver by FPGA.
Specific embodiment
To keep the embodiment of the present invention technical problems to be solved, technical solution and advantage clearer, below in conjunction with
Drawings and the specific embodiments are described in detail.
Market is needed for transparence display always than stronger, the colour gamut of the liquid crystal display panel of transparence display mode compared with
It is low, using the display pattern of FSC (Field-Sequential Color, field sequential color).
When the liquid crystal display panel of transparence display mode includes red (R), green (G), blue (B) three-color pixel, FSC shows mould
The time diagram of formula is sequentially written in three kinds of face as shown in Figure 1, the display time of each colour picture includes three frames in three frames
The data of color, each frame include Refresh Data write phase (R-DATA, B-DATA, G-DATA) and backlight lightening stage (R-
LED, G-LED, B-LED), the data and backlight timesharing sequence of three kinds of colors, which refresh, to be lighted, wherein the backlight lightening stage into
Row display, backlight lightening stage, that is, lighting time.
In addition it in the liquid crystal display panel of some transparence display modes, is needed because of used liquid crystalline type higher
Driving voltage, for example higher driving voltage is just needed when liquid crystal display panel uses PSLC (polymer network stabilized liquid crystal)
(12V), and conventional drive scheme is only capable of providing the driving voltage of highest 9V, at this moment needs the side overturn by using common voltage
Formula improves the VOP (operating voltage) of liquid crystal.The liquid crystal display panel of the relevant technologies is same using common voltage overturning and frame overturning
The mode of step, with realize increase liquid crystal VOP effect, as shown in Fig. 2, the course of work include: in nth frame, red pixel
Pixel electrode input the first polar gray scale voltage, while public electrode input the second polar common voltage, the first polarity with
Second polarity is opposite；In N+1 frame, the pixel electrode of green pixel inputs the second polar gray scale voltage, while public electrode
Input the first polar common voltage；The first polar gray scale voltage is inputted in the pixel electrode of N+2 frame, blue pixel, together
When public electrode input the second polar common voltage；The second polar ash is inputted in the pixel electrode of N+3 frame, red pixel
Rank voltage, while public electrode inputs the first polar common voltage；In N+4 frame, the pixel electrode input of green pixel the
One polar gray scale voltage, while public electrode inputs the second polar common voltage；In N+5 frame, the pixel of blue pixel
Electrode inputs the second polar gray scale voltage, while public electrode inputs the first polar common voltage；It is red in N+6 frame
The pixel electrode of pixel inputs the first polar gray scale voltage, while public electrode inputs the second polar common voltage, with this
Analogize.
As can be seen that the frequency of public voltage signal overturning is frame frequency, liquid crystal capacitance polar plate voltage can be generated and changed greatly
And cause the charge and discharge time longer, the lighting time is had compressed, the colour gamut of liquid crystal display panel is caused to further decrease, also, is public
The dynamic power consumption that the overturning of common voltage signal will lead to circuit system is higher, can also cause EMI to other electric signals.
To solve the above-mentioned problems, the embodiment of the present invention provides a kind of driving method of liquid crystal display panel, driving circuit
And display device, the colour gamut of display equipment can be improved, reduce circuit system dynamic power consumption, reduce EMI.
The embodiment of the present invention provides a kind of driving method of liquid crystal display panel, comprising:
Common electrode signal is sent to the public electrode wire of the liquid crystal display panel, makes to pass through on the public electrode wire
Public voltage signal overturn between the first common voltage and the second common voltage as unit of K frame, described first is public
Voltage and second common voltage relative to reference voltage polarity on the contrary, K is the integer greater than 1.
In the present embodiment, the public voltage signal passed through on public electrode wire as unit of K frame the first common voltage with
And second overturn between common voltage, wherein K is the integer greater than 1, can reduce the frequency of public voltage signal overturning in this way
Rate, and then the time of liquid crystal capacitance charge and discharge can be reduced, charging quality is improved, the lighting time can be correspondingly increased, is improved
The colour gamut of display device subtracts in addition, the frequency for reducing public voltage signal overturning can also reduce the dynamic power consumption of circuit system
Small EMI.
In the present embodiment, in two adjacent N frames, the first common voltage is provided respectively to the public electrode of pixel unit
With the second common voltage, and the driving voltage of liquid crystal capacitance is determined by the voltage difference between pixel electrode and public electrode, public
The change frequency reduction of electrode voltage can make the voltage change range on pixel electrode reduce, thus can make driving electricity
Road output voltage reduces, lower power consumption.
Wherein, K, which can according to need, is configured, and the value of K is bigger, then the frequency of public voltage signal overturning is lower,
The time of liquid crystal capacitance charge and discharge is fewer, and the display time is longer, and the dynamic power consumption of circuit system is lower.In order to guarantee driving electricity
Pressure is input to the gray scale voltage of the pixel electrode of pixel unit and the polarity of public voltage signal on the contrary, if common voltage is believed
Number polarity do not overturn for a long time, then being input to the gray scale voltage of the pixel electrode of pixel unit can also not overturn for a long time, hold
Easily there is liquid crystal polarization, in order to guarantee that liquid crystal is not polarized, the value of K can not be excessive, specifically, in the LCD display
When plate includes the light source of M kind different colours, the value of K can be equal to M, in this way can be to avoid same pixel unit in adjacent two frame
There is great voltage change, while guaranteeing that liquid crystal is not polarized.
In order to avoid liquid crystal polarization, the driving method further include:
When the common electrode signal sent to the public electrode wire is the first common voltage, to the pixel of pixel unit
Electrode inputs the first gray scale voltage；When the common electrode signal sent to the public electrode wire is the second common voltage, to
The pixel electrode of pixel unit inputs the second gray scale voltage, pole of first gray scale voltage relative to first common voltage
Property is opposite relative to the polarity of second common voltage with second gray scale voltage.
The liquid crystal display panel of the present embodiment can be the liquid crystal display panel of FSC display pattern, in FSC display pattern
In liquid crystal display panel, the pixel unit includes the different first frame pixel of color, the second frame pixel and third frame pixel,
In different frame, by lighting the light source of different colours, same pixel unit can be made to show different colors.In order to guarantee compared with
High driving voltage, while the charge and discharge time of pixel is reduced, it is in the common electrode signal sent to the public electrode wire
When the first common voltage, the gray scale voltage of Xiang Suoshu first frame pixel, the second frame pixel and third frame pixel input
Polarity relative to reference voltage is all the same；It is the second common voltage in the common electrode signal sent to the public electrode wire
When, the gray scale voltage of Xiang Suoshu first frame pixel, the second frame pixel and third frame pixel input is relative to benchmark electricity
The polarity of pressure is all the same.
As shown in Fig. 2, public voltage signal COM overturning frequency be frame frequency, public voltage signal the first common voltage+
It is overturn between V and the second common voltage (- V), the first common voltage+V and the second common voltage (- V) have relative to reference voltage C
There is opposite polarity；The gray scale voltage of the pixel electrode input of red pixel is overturn between+R and-R, and+R and-R are relative to base
Quasi- voltage C has opposite polarity；The gray scale voltage of the pixel electrode input of green pixel is overturn between+G and-G ,+G and-G
There is opposite polarity relative to reference voltage C；The gray scale voltage of the pixel electrode input of blue pixel turns between+B and-B
Turn ,+B and-B has opposite polarity relative to reference voltage C.In nth frame, red pixel is shown, inputs red picture
The gray scale voltage of the pixel electrode of element is+R, and public voltage signal COM is-V, and liquid crystal VOP is (+R)-(- V)=(+R)+V；N
When+1 frame, in order to avoid liquid crystal polarization, Data flipping has been carried out, the gray scale voltage for inputting the pixel electrode of green pixel is-G,
It is at this time (- G)-(+V)=(- G)-V for+V, liquid crystal VOP to keep high VOP, COM also to overturn；When N+2 frame, in order to keep away
Exempt from liquid crystal polarization, carried out Data flipping, the gray scale voltage for inputting the pixel electrode of blue pixel is+B, at this time in order to keep high
VOP, COM also overturns as-V, and liquid crystal VOP is (+B)-(- V)=(+B)+V；And so on, it can be seen that pass through common voltage
The overturning of signal is able to maintain higher liquid crystal VOP.
In the present embodiment, when liquid crystal display panel includes red light source, green light source and blue-light source, every 3 frames public affairs
The overturning of common voltage signal is primary, can have great voltage to become in adjacent two frame to avoid the pixel voltage of same pixel electrode in this way
Change, ensure that liquid crystal capacitance charge and discharge time and charging effect, while guaranteeing that liquid crystal is not polarized.
As shown in figure 3, the frequency of public voltage signal COM overturning is 3 frames, public voltage signal is in the first common voltage+V
And second overturn between common voltage (- V), the first common voltage+V and the second common voltage (- V) have relative to reference voltage C
There is opposite polarity；The gray scale voltage of the pixel electrode input of red pixel is overturn between+R and-R, and+R and-R are relative to base
Quasi- voltage C has opposite polarity；The gray scale voltage of the pixel electrode input of green pixel is overturn between+G and-G ,+G and-G
There is opposite polarity relative to reference voltage C；The gray scale voltage of the pixel electrode input of blue pixel turns between+B and-B
Turn ,+B and-B has opposite polarity relative to reference voltage C.In nth frame, red pixel is shown, inputs red picture
The gray scale voltage of the pixel electrode of element is+R, and public voltage signal COM is-V, and liquid crystal VOP is (+R)-(- V)=(+R)+V；N
When+1 frame, the gray scale voltage for inputting the pixel electrode of green pixel is+G, and public voltage signal COM does not need to overturn, remain as-
V, liquid crystal VOP are G- (- V)=(+G)+V；When N+2 frame, the gray scale voltage for inputting the pixel electrode of blue pixel is+B, public
Voltage signal COM does not need to overturn, and remains as-V, and liquid crystal VOP is (+B)-(- V)=(+B)+V；At this point, the voltage of liquid crystal pole plate
Three frames have been kept not overturn, in order to avoid liquid crystal polarization, in N+4 frame, red pixel is shown, inputs red picture
The gray scale voltage overturning of the pixel electrode of element is-R, and public voltage signal COM overturn simultaneously, is+V, liquid crystal VOP for (-
R)-(+V)=(- R)-V；When N+5 frame, the gray scale voltage overturning for inputting the pixel electrode of green pixel is-G, common voltage letter
Number COM is overturn simultaneously, is+V, and liquid crystal VOP is (- G)-(+V)=(- G)-V；When N+6 frame, the picture of blue pixel is inputted
The gray scale voltage overturning of plain electrode is-B, and public voltage signal COM is overturn simultaneously, is+V, and liquid crystal VOP is (- B)-(+V)
=(- B)-V；And so on.
As seen from Figure 3, in nth frame the-the N+2 frame, the polarity of pixel voltage is all the same, in N+3 frame the-the N+5 frame,
The polarity of pixel voltage is all the same, i.e., in adjacent three frame, the polarity of pixel voltage will not change, and can reduce so same
The voltage change of pixel electrode consecutive frame guarantees capacitor charge and discharge time and charging effect.
As can be seen that the present embodiment reduces liquid crystal pixel polar plate voltage under the premise of guaranteeing that liquid crystal is not polarized
Variation, shortens the liquid crystal capacitance charge and discharge time, improves charging quality, correspondingly increases the lighting time, and then improves saturating
The colour gamut obviously shown.Simultaneously as COM toggle frequency becomes original one third, the dynamic of the circuit system of COM overturning is generated
State power consumption is greatly reduced, and EMI also has preferable improvement.
Specifically, the liquid crystal display panel can be transparent display panel, can mention according to the technical solution of the present invention
The colour gamut of high transparency display panel.
The embodiment of the invention also provides a kind of driving circuits of liquid crystal display panel, comprising:
Common electrode drive unit, for sending common electrode signal to the public electrode wire of the liquid crystal display panel,
Make the public voltage signal passed through on the public electrode wire as unit of K frame in the first common voltage and the second common voltage
Between overturn, first common voltage and second common voltage relative to reference voltage polarity on the contrary, K is greater than 1
Integer.
In the present embodiment, the public voltage signal passed through on public electrode wire as unit of K frame the first common voltage with
And second overturn between common voltage, wherein K is the integer greater than 1, can reduce the frequency of public voltage signal overturning in this way
Rate, and then the time of liquid crystal capacitance charge and discharge can be reduced, charging quality is improved, the lighting time can be correspondingly increased, is improved
The colour gamut of display device subtracts in addition, the frequency for reducing public voltage signal overturning can also reduce the dynamic power consumption of circuit system
Small EMI.
Wherein, K, which can according to need, is configured, and the value of K is bigger, then the frequency of public voltage signal overturning is lower,
The time of liquid crystal capacitance charge and discharge is fewer, and the display time is longer, and the dynamic power consumption of circuit system is lower.In order to guarantee driving electricity
Pressure is input to the gray scale voltage of the pixel electrode of pixel unit and the polarity of public voltage signal on the contrary, if common voltage is believed
Number polarity do not overturn for a long time, then being input to the gray scale voltage of the pixel electrode of pixel unit can also not overturn for a long time, hold
Easily there is liquid crystal polarization, in order to guarantee that liquid crystal is not polarized, the value of K can not be excessive, specifically, in the LCD display
When plate includes the light source of M kind different colours, the value of K can be equal to M, in this way can be to avoid same pixel unit in adjacent two frame
There is great voltage change, while guaranteeing that liquid crystal is not polarized.
In order to avoid liquid crystal polarization, driving device further include:
Data drive unit, for being the first common voltage in the common electrode signal sent to the public electrode wire
When, the first gray scale voltage is inputted to the pixel electrode of pixel unit；In the common electrode signal sent to the public electrode wire
When for the second common voltage, input the second gray scale voltage to the pixel electrode of pixel unit, first gray scale voltage relative to
The polarity of first common voltage is opposite relative to the polarity of second common voltage with second gray scale voltage.
The liquid crystal display panel of the present embodiment can be the liquid crystal display panel of FSC display pattern, in FSC display pattern
In liquid crystal display panel, the pixel unit includes the different first frame pixel of color, the second frame pixel and third frame pixel,
In different frame, by lighting the light source of different colours, same pixel unit can be made to show different colors.In order to guarantee compared with
High driving voltage, while the charge and discharge time of pixel is reduced, it is in the common electrode signal sent to the public electrode wire
When the first common voltage, the data drive unit is to the first frame pixel, the second frame pixel and the third frame picture
The gray scale voltage of element input is all the same relative to the polarity of reference voltage；In the public electrode letter sent to the public electrode wire
When number being the second common voltage, the data drive unit is to the first frame pixel, the second frame pixel and the third
The gray scale voltage of frame pixel input is all the same relative to the polarity of reference voltage.
As shown in Fig. 2, public voltage signal COM overturning frequency be frame frequency, public voltage signal the first common voltage+
It is overturn between V and the second common voltage (- V), the first common voltage+V and the second common voltage (- V) have relative to reference voltage C
There is opposite polarity；The gray scale voltage of the pixel electrode input of red pixel is overturn between+R and-R, and+R and-R are relative to base
Quasi- voltage C has opposite polarity；The gray scale voltage of the pixel electrode input of green pixel is overturn between+G and-G ,+G and-G
There is opposite polarity relative to reference voltage C；The gray scale voltage of the pixel electrode input of blue pixel turns between+B and-B
Turn ,+B and-B has opposite polarity relative to reference voltage C.In nth frame, red pixel is shown, inputs red picture
The gray scale voltage of the pixel electrode of element is+R, and public voltage signal COM is-V, and liquid crystal VOP is (+R)-(- V)=(+R)+V；N
When+1 frame, in order to avoid liquid crystal polarization, Data flipping has been carried out, the gray scale voltage for inputting the pixel electrode of green pixel is-G,
It is at this time (- G)-(+V)=(- G)-V for+V, liquid crystal VOP to keep high VOP, COM also to overturn；When N+2 frame, in order to keep away
Exempt from liquid crystal polarization, carried out Data flipping, the gray scale voltage for inputting the pixel electrode of blue pixel is+B, at this time in order to keep high
VOP, COM also overturns as-V, and liquid crystal VOP is (+B)-(- V)=(+B)+V；And so on, it can be seen that pass through common voltage
The overturning of signal is able to maintain higher liquid crystal VOP.
In the present embodiment, when liquid crystal display panel includes red light source, green light source and blue-light source, every 3 frames public affairs
The overturning of common voltage signal is primary, can have great voltage to become in adjacent two frame to avoid the pixel voltage of same pixel electrode in this way
Change, ensure that liquid crystal capacitance charge and discharge time and charging effect, while guaranteeing that liquid crystal is not polarized.
As shown in figure 3, the frequency of public voltage signal COM overturning is 3 frames, public voltage signal is in the first common voltage+V
And second overturn between common voltage (- V), the first common voltage+V and the second common voltage (- V) have relative to reference voltage C
There is opposite polarity；The gray scale voltage of the pixel electrode input of red pixel is overturn between+R and-R, and+R and-R are relative to base
Quasi- voltage C has opposite polarity；The gray scale voltage of the pixel electrode input of green pixel is overturn between+G and-G ,+G and-G
There is opposite polarity relative to reference voltage C；The gray scale voltage of the pixel electrode input of blue pixel turns between+B and-B
Turn ,+B and-B has opposite polarity relative to reference voltage C.In nth frame, red pixel is shown, inputs red picture
The gray scale voltage of the pixel electrode of element is+R, and public voltage signal COM is-V, and liquid crystal VOP is (+R)-(- V)=(+R)+V；N
When+1 frame, the gray scale voltage for inputting the pixel electrode of green pixel is+G, and public voltage signal COM does not need to overturn, remain as-
V, liquid crystal VOP are G- (- V)=(+G)+V；When N+2 frame, the gray scale voltage for inputting the pixel electrode of blue pixel is+B, public
Voltage signal COM does not need to overturn, and remains as-V, and liquid crystal VOP is (+B)-(- V)=(+B)+V；At this point, the voltage of liquid crystal pole plate
Three frames have been kept not overturn, in order to avoid liquid crystal polarization, in N+4 frame, red pixel is shown, inputs red picture
The gray scale voltage overturning of the pixel electrode of element is-R, and public voltage signal COM overturn simultaneously, is+V, liquid crystal VOP for (-
R)-(+V)=(- R)-V；When N+5 frame, the gray scale voltage overturning for inputting the pixel electrode of green pixel is-G, common voltage letter
Number COM is overturn simultaneously, is+V, and liquid crystal VOP is (- G)-(+V)=(- G)-V；When N+6 frame, the picture of blue pixel is inputted
The gray scale voltage overturning of plain electrode is-B, and public voltage signal COM is overturn simultaneously, is+V, and liquid crystal VOP is (- B)-(+V)
=(- B)-V；And so on.
As seen from Figure 3, in nth frame the-the N+2 frame, the polarity of pixel voltage is all the same, in N+3 frame the-the N+5 frame,
The polarity of pixel voltage is all the same, i.e., in adjacent three frame, the polarity of pixel voltage will not change, and can reduce so same
The voltage change of pixel electrode consecutive frame guarantees capacitor charge and discharge time and charging effect.
As can be seen that the present embodiment reduces liquid crystal pixel polar plate voltage under the premise of guaranteeing that liquid crystal is not polarized
Variation, shortens the liquid crystal capacitance charge and discharge time, improves charging quality, correspondingly increases the lighting time, and then improves saturating
The colour gamut obviously shown.Simultaneously as COM toggle frequency becomes original one third, the dynamic of the circuit system of COM overturning is generated
State power consumption is greatly reduced, and EMI also has preferable improvement.
Specifically, it can be controlled by FPGA (Field Programmable Gate Array, field programmable gate array)
The toggle frequency of COM generation circuit processed passes through analog switch control+V or-V as shown in figure 4, FPGA is connect with analog switch
Public voltage signal export to the public electrode of liquid crystal display panel.
As shown in figure 5, the polarity upset signal of source driver (source electrode drive circuit) can also be controlled by FPGA
POL realizes the positive-negative polarity control of each frame data.
The embodiment of the invention also provides a kind of display devices, the driving electricity including liquid crystal display panel as described above
Road.
The display device includes but is not limited to: radio frequency unit, network module, audio output unit, input unit, sensing
The components such as device, display unit, user input unit, interface unit, memory, processor and power supply.Those skilled in the art
It is appreciated that the structure of above-mentioned display device does not constitute the restriction to display device, display device may include above-mentioned more
Or less component, perhaps combine certain components or different component layouts.In embodiments of the present invention, display device packet
Include but be not limited to display, mobile phone, tablet computer, television set, wearable electronic, navigation display equipment etc..
The display device can be with are as follows: any tool such as LCD TV, liquid crystal display, Digital Frame, mobile phone, tablet computer
There are the products or components of display function, wherein the display device further includes flexible circuit board, printed circuit board and backboard.
It is to be appreciated that all the embodiments in this specification are described in a progressive manner, phase between each embodiment
It may refer to each other with similar part, each embodiment focuses on the differences from other embodiments.In particular,
For embodiment, since it is substantially similar to product embodiments, so describing fairly simple, related place is referring to product
The part of embodiment illustrates.
Unless otherwise defined, the technical term or scientific term that the disclosure uses should be tool in disclosure fields
The ordinary meaning for thering is the personage of general technical ability to be understood." first ", " second " used in the disclosure and similar word are simultaneously
Any sequence, quantity or importance are not indicated, and are used only to distinguish different component parts." comprising " or "comprising" etc.
Similar word means that the element or object before the word occur covers the element or object for appearing in the word presented hereinafter
And its it is equivalent, and it is not excluded for other elements or object.The similar word such as " connection " or " connected " is not limited to physics
Or mechanical connection, but may include electrical connection, it is either direct or indirectly."upper", "lower",
"left", "right" etc. is only used for indicating relative positional relationship, and after the absolute position for being described object changes, then the relative position is closed
System may also correspondingly change.
It is appreciated that ought such as layer, film, region or substrate etc element be referred to as be located at another element "above" or "below"
When, which " direct " can be located at "above" or "below" another element, or may exist intermediary element.
In the description of above embodiment, particular features, structures, materials, or characteristics can be at any one or more
It can be combined in any suitable manner in a embodiment or example.
The above, the only specific embodiment of the disclosure, but the protection scope of the disclosure is not limited thereto, it is any
Those familiar with the art can easily think of the change or the replacement in the technical scope that the disclosure discloses, and should all contain
It covers within the protection scope of the disclosure.Therefore, the protection scope of the disclosure should be based on the protection scope of the described claims.
Claims (10)
1. a kind of driving method of liquid crystal display panel characterized by comprising
Common electrode signal is sent to the public electrode wire of the liquid crystal display panel, makes the public affairs passed through on the public electrode wire
Common voltage signal is overturn between the first common voltage and the second common voltage as unit of K frame, first common voltage
With second common voltage relative to the polarity of reference voltage on the contrary, K is the integer greater than 1.
2. the driving method of liquid crystal display panel according to claim 1, which is characterized in that the liquid crystal display panel packet
The light source of M kind different colours is included, K is equal to M.
3. the driving method of liquid crystal display panel according to claim 2, which is characterized in that further include:
When the common electrode signal sent to the public electrode wire is the first common voltage, to the pixel electrode of pixel unit
Input the first gray scale voltage；When the common electrode signal sent to the public electrode wire is the second common voltage, to pixel
The pixel electrode of unit inputs the second gray scale voltage, first gray scale voltage relative to first common voltage polarity with
Second gray scale voltage is opposite relative to the polarity of second common voltage.
4. the driving method of liquid crystal display panel according to claim 3, which is characterized in that the pixel unit includes face
The different first frame pixel of color, the second frame pixel and third frame pixel, in the public electrode sent to the public electrode wire
When signal is the first common voltage, the ash of Xiang Suoshu first frame pixel, the second frame pixel and third frame pixel input
Rank voltage is all the same relative to the polarity of reference voltage；It is second public in the common electrode signal sent to the public electrode wire
When common voltage, Xiang Suoshu first frame pixel, the second frame pixel and the third frame pixel input gray scale voltage relative to
The polarity of reference voltage is all the same.
5. the driving method of liquid crystal display panel according to claim 1, which is characterized in that the liquid crystal display panel is
Transparent display panel.
6. a kind of driving circuit of liquid crystal display panel characterized by comprising
Common electrode drive unit makes institute for sending common electrode signal to the public electrode wire of the liquid crystal display panel
The public voltage signal passed through on public electrode wire is stated as unit of K frame between the first common voltage and the second common voltage
Overturning, first common voltage and second common voltage relative to reference voltage polarity on the contrary, K is whole greater than 1
Number.
7. the driving circuit of liquid crystal display panel according to claim 6, which is characterized in that the liquid crystal display panel packet
The light source of M kind different colours is included, K is equal to M.
8. the driving circuit of liquid crystal display panel according to claim 7, which is characterized in that further include:
Data drive unit, for the common electrode signal sent to the public electrode wire be the first common voltage when, to
The pixel electrode of pixel unit inputs the first gray scale voltage；It is second in the common electrode signal sent to the public electrode wire
When common voltage, the second gray scale voltage is inputted to the pixel electrode of pixel unit, first gray scale voltage is relative to described the
The polarity of one common voltage is opposite relative to the polarity of second common voltage with second gray scale voltage.
9. the driving circuit of liquid crystal display panel according to claim 8, which is characterized in that the pixel unit includes face
The different first frame pixel of color, the second frame pixel and third frame pixel, in the public electrode sent to the public electrode wire
When signal is the first common voltage, the data drive unit is to the first frame pixel, the second frame pixel and described the
The gray scale voltage of three frame pixels input is all the same relative to the polarity of reference voltage；It is public being sent to the public electrode wire
When electrode signal is the second common voltage, the data drive unit is to the first frame pixel, the second frame pixel and institute
The gray scale voltage for stating the input of third frame pixel is all the same relative to the polarity of reference voltage.
10. a kind of display device, which is characterized in that including the liquid crystal display panel as described in any one of claim 6-9
Driving circuit.
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