CN109036315A - Driving method, driving device and the display equipment of display panel - Google Patents
Driving method, driving device and the display equipment of display panel Download PDFInfo
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- CN109036315A CN109036315A CN201811041044.3A CN201811041044A CN109036315A CN 109036315 A CN109036315 A CN 109036315A CN 201811041044 A CN201811041044 A CN 201811041044A CN 109036315 A CN109036315 A CN 109036315A
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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
- G09G2320/0233—Improving the luminance or brightness uniformity across the screen
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- Theoretical Computer Science (AREA)
- Control Of Indicators Other Than Cathode Ray Tubes (AREA)
- Liquid Crystal Display Device Control (AREA)
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Abstract
The invention discloses a kind of driving method of display panel, driving device and display equipment, belong to liquid crystal display device field.The driving method of the display panel includes providing data-signal to the pixel electrode of pixel unit, and pixel electrode is made to generate pixel voltage；Public voltage signal is provided to public electrode corresponding with pixel electrode, public voltage signal is used for the display stage in pixel unit, public electrode is set to generate the common voltage with pixel voltage change, and the variable quantity of the difference of pixel voltage and common voltage is no more than preset value within the same display stage, so that liquid crystal is kept in a certain range in the variation degree of the light transmission rate in display stage, the variation degree of shown brightness can also be kept in a certain range, to which the brightness change of pixel unit can be reduced when showing same frame picture.
Description
Technical field
The present invention relates to liquid crystal display device field, in particular to a kind of driving method of display panel, driving device and
Show equipment.
Background technique
During the display of liquid crystal display panel, electric field is generated between pixel electrode and public electrode, to drive liquid crystal
Molecule deflects, and the liquid crystal molecule after deflection can penetrate the light of certain brightness, by adjusting pixel electrode and common electrical
Electric field strength between pole changes the light transmission rate of liquid crystal molecule, realizes that different grayscale is shown.
During driving, the common voltage on public electrode remains constant, the difference of pixel voltage and common voltage
The absolute value of value is corresponding with shown grayscale, when the absolute value difference of pixel voltage and the difference of common voltage, liquid crystal
Light transmission rate it is also different so that shown grayscale is also different.
Due to during showing same frame picture, the pixel voltage on pixel electrode be not it is constant so that picture
The difference of plain voltage and common voltage is non-constant, and the light transmission rate of liquid crystal changes, therefore shown grayscale can become
Change, is visually appear as same frame picture and brightness change occur.
Summary of the invention
The embodiment of the invention provides a kind of driving method of display panel, driving device and display equipment, can reduce
There is brightness change in same frame picture.The technical solution is as follows:
On the one hand, the embodiment of the invention provides a kind of driving methods of display panel, comprising:
Data-signal is provided to the pixel electrode of pixel unit, the pixel electrode is made to generate pixel voltage；
Public voltage signal is provided to public electrode corresponding with the pixel electrode, the public voltage signal is used for
The display stage of the pixel unit makes the public electrode generate the common voltage with the pixel voltage change, and same
The variable quantity of the difference of the pixel voltage and the common voltage is no more than preset value in the one display stage.
Optionally, the display panel includes multiple pixel units, and each pixel unit includes the picture
Plain electrode and the public electrode, the public electrode are arranged in a one-to-one correspondence with the pixel electrode, the method also includes:
According to pixel unit grayscale to display, the common electrical corresponding with grayscale to display is generated
Press signal.
Optionally, described according to pixel unit grayscale to display, it generates corresponding with grayscale to display
The public voltage signal, comprising:
The corresponding relationship of grayscale according to the pre-stored data and voltage value set determines the corresponding voltage of grayscale to display
Value set, each voltage value set includes multiple voltage values；
The public voltage signal is generated based on the multiple voltage value, the public voltage signal is pre- including successively continuing
If several subsignals of duration, the voltage of several subsignals respectively with voltage value phase corresponding in the multiple voltage value
Deng.
Optionally, the method also includes:
A variety of pixel voltages of corresponding different grayscale are obtained respectively；
It determines in the display stage, the difference of the pixel voltage and the common voltage；
Obtain corresponding to the public voltage signal of different grayscale according to the difference and the pixel voltage, to obtain
The corresponding relationship of the grayscale and voltage value set；
Save the corresponding relationship of the grayscale and voltage value set.
Optionally, the display stage of same gray level, the pixel voltage and the difference of the common voltage are shown
Absolute value is equal.
On the other hand, the embodiment of the invention also provides a kind of driving devices of display panel, comprising:
Controller makes the pixel electrode generate pixel electricity for providing data-signal to the pixel electrode of pixel unit
Pressure；And for providing public voltage signal to public electrode corresponding with the pixel electrode, the public voltage signal is used for
In the display stage of the pixel unit, make the public electrode generation with the common voltage of the pixel voltage change, and
The variable quantity of the difference of the pixel voltage and the common voltage is no more than preset value in the same display stage.
Optionally, the display panel includes multiple pixel units, and each pixel unit includes the picture
Plain electrode and the public electrode, the public electrode are arranged in a one-to-one correspondence with the pixel electrode, and the controller is also used to
According to pixel unit grayscale to display, the public voltage signal corresponding with grayscale to display is generated.
Optionally, further includes:
Memory, for storing the corresponding relationship of grayscale and voltage value set；
The controller is also used to the corresponding relationship of the grayscale and voltage value set according to the pre-stored data, and determination is wanted
The corresponding voltage value set of the grayscale of display, each voltage value set includes multiple voltage values, and is based on the multiple electricity
Pressure value generates the public voltage signal, and the public voltage signal includes successively continuing described in several subsignals of preset duration
The voltage of several subsignals is equal with corresponding voltage value in the multiple voltage value respectively.
In another aspect, the display equipment includes foregoing the embodiment of the invention also provides a kind of display equipment
The driving device of display panel.
Optionally, the display equipment further includes display panel, and the display panel includes more public electrode wires, more
Data line and Duo Gen scan line, the more public electrode wires and the more data line alternate intervals are distributed, more radicals
It intersects according to line and the more scan lines and limits multiple pixel regions, a picture is provided in each pixel region
Plain unit, the pixel unit include public electrode, pixel electrode, first film transistor and the second thin film transistor (TFT),
In the same pixel unit, the pixel electrode is connect with the first pole of the first film transistor,
Second pole of the first film transistor is connected with the corresponding data line, the control electrode of the first film transistor with
The corresponding scan line connection,
In the same pixel unit, the public electrode is connect with the first pole of second thin film transistor (TFT),
Second pole of second thin film transistor (TFT) is connected with the corresponding public electrode wire, the control of second thin film transistor (TFT)
Pole is connected with the corresponding scan line.
Technical solution bring beneficial effect provided in an embodiment of the present invention includes at least: at the display stage of pixel,
Pixel voltage can gradually change at any time, provide public voltage signal to public electrode by the display stage in pixel, make public affairs
Common electrode generates the common voltage with pixel voltage change, and pixel voltage and common voltage within the same display stage
The variable quantity of difference is no more than preset value, so that liquid crystal is maintained at a certain range in the variation degree of the light transmission rate in display stage
Interior, the variation degree of shown brightness can also be kept in a certain range, to can reduce when showing same frame picture
The brightness change of pixel unit.
Detailed description of the invention
To describe the technical solutions in the embodiments of the present invention more clearly, make required in being described below to embodiment
Attached drawing is briefly described, it should be apparent that, drawings in the following description are only some embodiments of the invention, for
For those of ordinary skill in the art, without creative efforts, it can also be obtained according to these attached drawings other
Attached drawing.
Fig. 1 is a kind of partial structural diagram of display panel；
Fig. 2 is a kind of driver' s timing signal graph of pixel circuit；
Fig. 3 is a kind of flow chart of the driving method of display panel provided in an embodiment of the present invention；
Fig. 4 is a kind of driver' s timing signal graph of pixel circuit provided in an embodiment of the present invention；
Fig. 5 is the relation schematic diagram of public voltage signal and common voltage provided in an embodiment of the present invention；
Fig. 6 is a kind of process of the method for corresponding relationship for obtaining grayscale and voltage value set provided in an embodiment of the present invention
Figure；
Fig. 7 is a kind of driver' s timing signal schematic diagram provided in an embodiment of the present invention；
Fig. 8 is a kind of structure chart of the driving device of display panel provided in an embodiment of the present invention；
Fig. 9 is a kind of local circuit schematic diagram for showing equipment provided in an embodiment of the present invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached drawing to embodiment party of the present invention
Formula is described in further detail.
Fig. 1 is a kind of partial structural diagram of display panel.As shown in Figure 1, the display panel include public electrode wire,
More scan lines 11 and Duo Gen data line 12.More scan lines 11 and Duo Gen data line 12 intersect multiple pixel regions at restriction
A pixel unit is provided in domain E, each pixel region E.Pixel unit includes thin film transistor (TFT) T and pixel electrode 13, institute
Some pixel electrodes 13 correspond to a public electrode 14 jointly.Film crystalline substance is connected in the infall of scan line 11 and data line 12
Body pipe T.The first pole of thin film transistor (TFT) T is connect with data line 12, and the control electrode of thin film transistor (TFT) T is connect with scan line 11, thin
The second pole of film transistor T and pixel electrode 13, storage CstConnection.The first pole of thin film transistor (TFT) T and film crystal
The second pole of pipe T is respectively one in the source electrode and drain electrode of thin film transistor (TFT) T.Between public electrode 14 is parallel with pixel electrode 13
Liquid crystal is accompanied between setting, pixel electrode 13 and public electrode 14.Public electrode 14 and public electrode wire can pass through via hole
Connection.Scan line 11 is for loading scanning signal, and data line 12 is for loading data-signal, scanning signal and data-signal
Think square-wave signal.When thin film transistor (TFT) T is connected under the action of scanning signal, data-signal is loaded on data line 12,
Then pixel voltage can be formed on pixel electrode 13.
Fig. 2 is a kind of driver' s timing signal graph of pixel circuit.It is illustrated by taking a pixel unit as an example, V in Fig. 2g
For scanning signal, VpFor pixel voltage, VcomFor common voltage, t1For the charging stage of pixel unit, thin film transistor (TFT) T is charging
Stage t1Conducting, to storage CstCharging.t2For the display stage of pixel unit, thin film transistor (TFT) T is in display stage t2
It closes, to stop to storage CstCharging.Charging stage t1Duration be much smaller than display stage t2Duration.In display rank
Section t2When, the corresponding sub-pixel point of pixel unit is lit, when all pixels unit of display panel traverses one time, display surface
Plate realizes the display of a frame picture.As shown in Fig. 2, in charging stage t1, storage CstIn charging process, pixel electrode
13 voltage increases, and sets up electric field between pixel electrode 13 and public electrode 14.In display stage t2, storage CstStop
It only charges, the voltage of pixel electrode 13 tops out, and constant electric field is formed between pixel electrode 13 and public electrode 14.Liquid crystal
It is deflected under electric field action between pixel electrode 13 and public electrode 14, the light transmission rate of liquid crystal changes.Pass through change
Voltage difference between pixel electrode 13 and public electrode 14, thus it is possible to vary the light transmission rate of liquid crystal, to realize that grayscale is shown.?
Display stage t2, it is generally recognized that the voltage of pixel electrode 13 is constant (stage t to be shown in such as Fig. 22Horizontal dotted line shown in).
But in fact, due to the off-state current I of thin film transistor (TFT) ToffInfluence, display stage t2The voltage of pixel electrode can be gradually
Variation.As shown in Fig. 2, in entirely display stage t2, pixel voltage change Voff.Therefore pixel electrode 13 and public electrode 14
Between the electric field that is formed be not it is constant, the light transmission rate of liquid crystal is in display stage t2It can gradually change, show same
Frame picture just will appear brightness change.Technical solution provided by the embodiment of the present invention is exactly same caused by the reason in order to reduce
The brightness change of one frame picture.
Fig. 3 is a kind of flow chart of the driving method of display panel provided in an embodiment of the present invention.As shown in figure 3, this is aobvious
The driving method for showing panel includes:
S11: data-signal is provided to the pixel electrode of pixel unit, pixel electrode is made to generate pixel voltage.
S12: according to pixel unit grayscale to display, common voltage letter corresponding with grayscale to display is generated
Number.
Public voltage signal is loaded on public electrode by public electrode wire, and public electrode is made to generate common voltage.?
When showing different grayscale, different data-signals can be loaded on data line, so that pixel electrode is generated different pixel voltages, therefore
There are corresponding relationships for pixel voltage and the grayscale of display, can determine pixel voltage according to grayscale to display.According to fig. 2
It is found that pixel voltage can change in the display stage, and different pixel voltages is also different in the variation in display stage, in order to
So that being no more than preset value, common voltage needs pair in same display stage pixel voltage and the variable quantity of the difference of common voltage
Pixel voltage is answered to be configured.Therefore corresponding public voltage signal can be generated according to grayscale to display, makes common electrical
Corresponding common voltage can be generated on extremely.
S13: public voltage signal is provided to public electrode corresponding with pixel electrode.
Wherein, public voltage signal is used to make public electrode generation become with pixel voltage in the display stage of pixel unit
The common voltage of change, and the variable quantity of the difference of pixel voltage and common voltage is no more than preset value within the same display stage.
At the display stage of pixel unit, pixel voltage can gradually change at any time, pass through the display in pixel unit
Stage provides public voltage signal to public electrode, so that public electrode is generated the common voltage with pixel voltage change, and same
The variable quantity of the difference of pixel voltage and common voltage is no more than preset value in one display stage, so that liquid crystal is in the display stage
The variation degree of light transmission rate is kept in a certain range, and the variation degree of shown brightness can also be maintained at a certain range
It is interior, so that the brightness change of pixel unit can be reduced when showing same frame picture.
Step S12 is optional step, for part display panel, such as calculator, automobile audio, electronic scale, water heater,
The liquid crystal display of electronic watch etc. does not need progress grayscale and shows that is, pixel unit only shows a kind of brightness in the display stage, can
To be not provided with step S12.The structure of this display panel can be identical as the structure of display panel shown in FIG. 1.This aobvious
Show in panel, all pixel electrodes correspond to the same public electrode.
In addition to small part display panel, most of display panel requires progress grayscale and shows, such as mobile phone, tablet computer
Deng liquid crystal display.In order to reduce brightness change of this display panel when showing same frame picture, step can be set
S12.This display panel includes multiple pixel units, and each pixel unit includes the pixel electrode being arranged in a one-to-one correspondence and public affairs
Common electrode has multiple public electrodes, and public electrode is arranged in a one-to-one correspondence with pixel electrode.The structure of the display panel can be with
Referring to Fig. 9.In the display stage, pixel voltage on pixel electrode and the change of the difference of the common voltage on corresponding public electrode
Change amount is no more than preset value, so that it may reduce the brightness change of each pixel unit when showing same frame picture.
Optionally, preset value can be 0, when preset value is 0, i.e., pixel voltage and common electrical within the same display stage
The difference of pressure is constant.The brightness change of the pixel unit when showing same frame picture can be completely eliminated in this way.The present embodiment with
Preset value is illustrated for being 0.
Fig. 4 is a kind of driver' s timing signal graph of pixel circuit provided in an embodiment of the present invention.As shown in figure 4, scanning letter
Number Vg, pixel voltage VpIt is identical as Fig. 2, charging stage t1, display stage t2Duration it is also identical as Fig. 2.In order to distinguish, Fig. 4
In common voltage be represented by dashed line, while the common voltage in Fig. 2 is also shown for the ease of comparison, in Fig. 4.In display rank
Section t2, pixel voltage VpWith common voltage VcomDifference be constant all the time, therefore at this stage in, pixel electrode 13 and public electrode
The electric field formed between 14 is kept constant, and the light transmission rate of liquid crystal is constant, and same frame picture is not in brightness change.
Optionally, in the display stage of display same gray level, the absolute value of the difference of pixel voltage and common voltage can be with
It is equal.Within the different display stages, as long as the grayscale of display is identical, the absolute value of the difference of pixel voltage and common voltage
With regard to equal, in this way when the grayscale of adjacent two frame is identical, would not be flashed when showing this two frame.Liquid crystal one in order to prevent
It directly deflects and polarizes in one direction, usually require to carry out polarity reversion.By taking Fig. 4 as an example, when showing a frame picture,
Each pixel unit only undergoes a display stage t2, two adjacent display stages an of pixel unit are shown in the figure
t2, it can realize that two frame pictures are shown.Pixel voltage in former frame on pixel electrode 13 is greater than on public electrode 14
Common voltage, be positive polarity driven at this time.In a later frame, the pixel voltage of pixel electrode 13 is less than the public affairs on public electrode 14
Common voltage, be negative polarity driven at this time.If this two frames picture grayscale to display be it is identical, polarity reversion before and after,
The absolute value of the difference of pixel voltage and common voltage is unequal, just will appear film flicker.Pixel voltage and public affairs in two frames
The absolute value of the difference of common voltage is equal, and the light transmission rate of liquid crystal is also identical, thus grayscale shown by two frames be it is identical, just
It is not in film flicker.The needs that thus can satisfy polarity reversion, show that liquid crystal display normally, and
It can be flashed to avoid during polarity inverts.
It optionally, can be with the corresponding relationship of grayscale according to the pre-stored data and voltage value set, really before step S12
Determine the corresponding voltage value set of grayscale to display, each voltage value set includes multiple voltage values.It is based on multiple voltages again
Value generates public voltage signal.
Optionally, public voltage signal may include the several subsignals for successively continuing preset duration, several subsignals
Voltage it is equal with corresponding voltage value in multiple voltage values of voltage value set respectively.Illustratively, electric in voltage value set
The quantity of pressure value can be equal with the quantity of subsignal, the voltage of several subsignals according to the voltage value in voltage value set successively
Variation.Alternatively, the quantity that the quantity of voltage value can also be greater than subsignal in voltage value set in this case can
To select voltage value identical with subsignal quantity from voltage value set according to the sequence of setting, the then electricity of several subsignals
It presses and successively changes according to the voltage value chosen.For example, include 12 voltage values in voltage value set, and the quantity of subsignal
It is 6, at this point it is possible to which 6 voltage values are selected at interval from 12 voltage values, for example selects odd number voltage value or selection even
Several voltage values.
Fig. 5 is the relation schematic diagram of public voltage signal and common voltage provided in an embodiment of the present invention.It is shown in Fig. 5
Two public voltage signal A and B and common voltage a and b corresponding with public voltage signal A and B, public voltage signal C and D
And common voltage c and d corresponding with public voltage signal C and D.As shown in figure 5, public voltage signal is same with common voltage
Step.Different grayscale corresponds to different public voltage signals, and different public voltage signals can produce on public electrode
Raw different common voltage.Public voltage signal A shown in Fig. 5 includes 6 subsignals for successively continuing preset duration.It is default
Duration is shorter, and the subsignal quantity that public voltage signal includes is more, and the waveform of public voltage signal is just closer to curve, same
The variation of the difference of pixel voltage and common voltage is closer constant with regard to smaller in one display stage, such as public voltage signal C
With public voltage signal D.
Before step S11, which can also include obtaining and saving grayscale and voltage value set
Corresponding relationship.It can be in order to generating public voltage signal after the corresponding relationship for obtaining and saving grayscale and voltage value set.
Fig. 6 is a kind of process of the method for corresponding relationship for obtaining grayscale and voltage value set provided in an embodiment of the present invention
Figure.This method can get the corresponding relationship of grayscale and voltage value set by a pixel unit.As shown in fig. 6, the party
Method includes:
S21: a variety of pixel voltages of corresponding different grayscale are obtained respectively.
Optionally, step S21 may comprise steps of:
Step 1: in the same display stage, the pixel voltage value at multiple moment is obtained.
In the display stage, pixel voltage meeting time to time change, by obtaining the pixel voltage value at multiple moment, thus
To in the display stage, pixel voltage changes with time relationship, convenient for determining common voltage.
Illustratively, the pixel voltage value of the display equipment to have completed can be obtained by way of measurement.It can
With the acquisition pixel voltage value of constant duration.Such as scanning signal is loaded in scan line, data letter is loaded on the data line
Number, pixel voltage can be generated on pixel electrode, the waveform that pixel voltage changes over time can be obtained by oscillograph, from waveform
The pixel voltage value of upper available different moments.
It is alternatively possible to repeatedly load identical data-signal on the data line, and multiple waves are got by oscillograph
Shape obtains multiple pixel voltage values at regular intervals from each waveform, calculates the phase of different wave in the same time
The average value of pixel voltage value.The relationship of pixel voltage and time, knot can be obtained according to average value in the next steps in this way
Fruit is more acurrate.Such as when obtaining the pixel voltage of corresponding grayscale 200, it can divide 10 times and load corresponding grayscale on the data line
200 data-signal, so as to obtain 10 kinds of pixel voltages of corresponding grayscale 200, by oscillograph available similar 10
A waveform (error cause between waveform there is some difference).With display stage of the every kind of pixel voltage when positive polarity drives
For, every kind of pixel voltage obtains 6 pixel voltage values respectively, by averaging, available 6 average value, and subsequent step
Suddenly the relationship of pixel voltage and time can be obtained according to this 6 average values.
Referring to Fig. 4, in charging stage t1At the end of, the voltage on pixel electrode is V1, in display stage t2When beginning, by
It is reduced in the voltage of scan line, closes thin film transistor (TFT), this can cause the voltage on pixel electrode a Δ V occurpUnder
Drop makes voltage dip on pixel electrode to V2, Δ Vp=Cgs*ΔVg/(Clc+Cst+Cgs), wherein CgsFor thin film transistor (TFT)
Parasitic capacitance between first pole and control electrode, Δ VgFor the voltage drop values in scan line, ClcFor the capacitor of liquid crystal, CstTo deposit
The capacitor of storage container.In measurement, display stage t can be measured2The pixel voltage value V of initial time2, then wait the times
Interval measurement goes out multiple pixel voltage values, such as can be from display stage t2Initial time starts, 5~10 pixels of interval measurement
Voltage value, it is assumed that a display stage t2Continue 1ms, 5 pixel voltage values of interval measurement then can measure one with every 0.25ms
Pixel voltage value.
Step 2: the relationship of pixel voltage and time are obtained according to the pixel voltage value at multiple moment.
Here the relationship of pixel voltage and time refer to the relationship of pixel voltage and time within the same display stage.Same
Display stage, pixel voltage gradually change, and by taking first display stage shown in Fig. 4 as an example, pixel voltage can gradually drop
It is low, by the pixel voltage value for obtaining multiple moment, so that it may obtain the relationship of pixel voltage and time.Such as it is multiple obtaining
After pixel voltage value, the functional relation Formula V of pixel voltage and time are fittedp=F (t), wherein t is the time.In step 1
Acquired pixel voltage value is more, then the relationship of the pixel voltage and time that obtain is more accurate.
For different grayscale, the voltage on pixel electrode also can be different, therefore different grayscale can be carried out respectively
Measurement, to obtain corresponding to pixel voltage when different grayscale and the relationship of time.Such as common display equipment has 256 ashes
Rank, therefore the relationship of available 256 pixel voltages and time.
In addition, it is contemplated that the polarity of liquid crystal display inverts, and in negative polarity driving and positive polarity driving, pixel voltage
Also different, therefore for same grayscale, it can also be measured respectively in negative polarity driving and positive polarity driving, to obtain pair
Pixel voltage and the relationship of time when pixel voltage when negative polarity being answered to drive drives with the relationship of time and corresponding positive polarity.
S22: it determines in display stage, the difference of pixel voltage and common voltage.
Wherein, difference is constant within the same voltage holding stage.
Under different grayscale, pixel voltage is different from the absolute value of the difference of common voltage, therefore can correspond to different
Different differences is arranged in grayscale.Same grayscale drives identical with the absolute value of difference when positive polarity driving in negative polarity.Such as
Under a certain grayscale, the difference in positive polarity driving can be set to Δ V, then the difference when negative polarity drives can be set
It is set to-Δ V.
S23: obtaining corresponding to the public voltage signal of different grayscale according to difference and pixel voltage, to obtain grayscale and electricity
Press the corresponding relationship of value set.
The difference of any time due to pixel voltage with common voltage within the same display stage is all equal, in picture
The difference is subtracted on the basis of plain voltage can obtain the common voltage at corresponding moment.Such as driven in positive polarity, show rank
Section t2When beginning, common voltage Vcom=V2-ΔV.If fitting pixel voltage and time after obtaining multiple pixel voltage values
Functional relation is Vp=F (t), then common voltage Vcom=F (t)-Δ V.If in negative polarity driving, common voltage Vcom
=F (t)+Δ V.If showing, equipment has 256 grayscale, has obtained the relationship of 256 pixel voltages and time, then can determine
256 common voltages out.The display panel shown for not needing progress grayscale, in negative polarity driving and positive polarity driving,
The relationship of each available 1 pixel voltage and time.
In the positive polarity driving and negative polarity driving of same grayscale, stage t is shown2Common voltage when beginning can not
It is equal, it can also be equal.Such as driver' s timing signal schematic diagram shown in Fig. 7, wherein illustrating only display stage t2Pixel electricity
Pressure and common voltage.In first display stage t2When beginning, pixel voltage V2, common voltage Vcom=V2Δ V,
Two display stage t2When beginning, pixel voltage V2', common voltage Vcom=V2'+Δ V, in two display stage t2When beginning
Common voltage VcomIt is equal, therefore in display stage t2When beginning, common voltage Vcom=0.5 (V2+V2’)。
Due to public voltage signal with common voltage be it is synchronous, after obtaining common voltage, so that it may obtain it is corresponding not
With the public voltage signal of grayscale.Such as the multiple voltages for corresponding to the common voltage of any grayscale are obtained with constant duration
Value, these voltage values just constitute voltage value set corresponding with the grayscale, so as to obtain grayscale and voltage value set
Corresponding relationship.
Fig. 8 is a kind of structure chart of the driving device of display panel provided in an embodiment of the present invention.As shown in figure 8, the drive
Dynamic device includes controller 31.
Wherein, controller 31 is used to provide data-signal to pixel electrode, and pixel electrode is made to generate pixel voltage；And it is used for
Public voltage signal is provided to public electrode.Public voltage signal is used to make public electrode produce in the display stage of pixel unit
The raw common voltage with pixel voltage change, and within the same display stage difference of pixel voltage and common voltage variable quantity
No more than preset value.
Controller 31 can provide public voltage signal to public electrode according to aforementioned step S13.
At the display stage of pixel unit, pixel voltage can gradually change at any time, pass through the display in pixel unit
Stage provides public voltage signal to public electrode, so that public electrode is generated the common voltage with pixel voltage change, and same
The variable quantity of the difference of pixel voltage and common voltage is no more than preset value in one display stage, so that liquid crystal is in the display stage
The variation degree of light transmission rate is kept in a certain range, and the variation degree of shown brightness can also be maintained at a certain range
It is interior, so that the brightness change of pixel unit can be reduced when showing same frame picture.
Optionally, preset value can be 0, when preset value is 0, i.e., pixel voltage and common electrical within the same display stage
The difference of pressure is constant.The brightness change of the pixel unit when showing same frame picture can be completely eliminated in this way.
Optionally, controller 31 can be also used for according to pixel unit grayscale to display, generate with it is to display
The corresponding public voltage signal of grayscale.Controller 31 can generate public voltage signal according to aforementioned step S12.Work as display
Panel includes multiple pixel units, and each pixel unit includes the pixel electrode and public electrode being arranged in a one-to-one correspondence, that is, is had
Multiple public electrodes, and when public electrode and pixel electrode are arranged in a one-to-one correspondence, it can be reduced and shown using the driving device
The brightness change of each pixel unit when same frame picture.
Further, which can also include memory 32, and memory 32 is for storing grayscale and voltage value collection
The corresponding relationship of conjunction.It can be in order to generating public voltage signal.The corresponding relationship of grayscale and voltage value set can be according to Fig. 6 institute
The method shown obtains.
Controller 31 can be also used for the corresponding relationship of grayscale according to the pre-stored data and voltage value set, and determination to be shown
The corresponding voltage value set of the grayscale shown, each voltage value set include multiple voltage values, and generate public affairs based on multiple voltage values
Common voltage signal, public voltage signal include the several subsignals for successively continuing preset duration, the voltage point of several subsignals
Not with corresponding voltage value in multiple voltage values of voltage value set.Controller 31 can be generated according to embodiment of the method above-mentioned
Public voltage signal.
The embodiment of the invention also provides a kind of display equipment, which may include display surface as shown in Figure 8
The driving device of plate.Optionally, which can be but be not limited to the liquid crystal displays such as mobile phone, tablet computer, navigator
Equipment.
Fig. 9 is a kind of local circuit schematic diagram for showing equipment provided in an embodiment of the present invention.As shown in figure 9, the display
Equipment further includes display panel, and display panel includes more public electrode wires 16, more data lines 12 and Duo Gen scan line 11.It is more
Root public electrode wire 16, more data lines 12 and Duo Gen scan line 11 are connect with the driving device of display panel 17.
More public electrode wires 16 are distributed with more 12 alternate intervals of data line, more data lines 12 and Duo Gen scan line 11
It intersects and limits multiple pixel region E.A pixel unit is provided in each pixel region E, pixel unit includes public affairs
Common electrode 14, pixel electrode 13, first film transistor T1 and the second thin film transistor (TFT) T2 are illustrated only in figure as signal
The part-structure of public electrode 14, pixel electrode 13.In the same pixel unit, pixel electrode 13 and first film transistor
The first pole of T1 connects, and the second pole of first film transistor T1 is connected with corresponding data line 12, first film transistor T1
Control electrode connected with corresponding scan line 11.In the same pixel unit, public electrode 14 and the second thin film transistor (TFT) T2
The connection of the first pole, the second pole of the second thin film transistor (TFT) T2 connects with corresponding 14 line of public electrode, the second thin film transistor (TFT)
The control electrode of T2 is connected with corresponding scan line 11.Liquid crystal is accompanied between pixel electrode 13 and public electrode 14.The first film
The first pole of transistor T1 and the second pole of first film transistor T1 are respectively the source electrode and drain electrode of first film transistor T1
In one.The first pole of second thin film transistor (TFT) T2 and the second pole of the second thin film transistor (TFT) T2 are respectively the second film crystal
One in the source electrode and drain electrode of pipe T2.First film transistor T1 and the second film crystal can be controlled simultaneously by scan line
The on-off of pipe T2 can load different public voltage signals by more public electrode wires 16, make different public electrodes 14
On can produce different common voltages.It, can between pixel electrode 13 and public electrode 14 in this way in different pixel units
To generate the deflection of different voltage difference control liquid crystal, to realize the display of different gray scales.In the display stage, each pixel
Pixel voltage on electrode 13 is no more than preset value with the variable quantity of the difference of the common voltage on corresponding public electrode 14, just
The brightness change of each pixel unit when showing same frame picture can be reduced.
The foregoing is merely presently preferred embodiments of the present invention, is not intended to limit the invention, it is all in spirit of the invention and
Within principle, any modification, equivalent replacement, improvement and so on be should all be included in the protection scope of the present invention.
Claims (10)
1. a kind of driving method of display panel characterized by comprising
Data-signal is provided to the pixel electrode of pixel unit, the pixel electrode is made to generate pixel voltage；
Public voltage signal is provided to public electrode corresponding with the pixel electrode, the public voltage signal is used for described
The display stage of pixel unit makes the public electrode generate the common voltage with the pixel voltage change, and in same institute
The variable quantity for stating the difference of the pixel voltage and the common voltage in the display stage is no more than preset value.
2. the driving method of display panel according to claim 1, which is characterized in that the display panel includes multiple institutes
Pixel unit is stated, each pixel unit includes the pixel electrode and the public electrode being arranged in a one-to-one correspondence, institute
State method further include:
According to pixel unit grayscale to display, the common voltage letter corresponding with grayscale to display is generated
Number.
3. the driving method of display panel according to claim 2, which is characterized in that described according to the pixel unit institute
Grayscale to be shown generates the public voltage signal corresponding with grayscale to display, comprising:
The corresponding relationship of grayscale according to the pre-stored data and voltage value set determines the corresponding voltage value collection of grayscale to display
It closes, each voltage value set includes multiple voltage values；
The public voltage signal is generated based on the multiple voltage value, the public voltage signal includes when successively persistently presetting
Long several subsignals, the voltage of several subsignals are equal with corresponding voltage value in the multiple voltage value respectively.
4. the driving method of display panel according to claim 3, which is characterized in that the method also includes:
A variety of pixel voltages of corresponding different grayscale are obtained respectively；
It determines in the display stage, the difference of the pixel voltage and the common voltage；
Obtain corresponding to the public voltage signal of different grayscale according to the difference and the pixel voltage, it is described to obtain
The corresponding relationship of grayscale and voltage value set；
Save the corresponding relationship of the grayscale and voltage value set.
5. the driving method of display panel according to claim 4, which is characterized in that show the display of same gray level
Stage, the pixel voltage are equal with the absolute value of the difference of the common voltage.
6. a kind of driving device of display panel characterized by comprising
Controller makes the pixel electrode generate pixel voltage for providing data-signal to the pixel electrode of pixel unit；And
For providing public voltage signal to public electrode corresponding with the pixel electrode, the public voltage signal is used for described
The display stage of pixel unit makes the public electrode generate the common voltage with the pixel voltage change, and in same institute
The variable quantity for stating the difference of the pixel voltage and the common voltage in the display stage is no more than preset value.
7. the driving device of display panel according to claim 6, which is characterized in that the display panel includes multiple institutes
State pixel unit, each pixel unit includes the pixel electrode and the public electrode, the public electrode and institute
Pixel electrode is stated to be arranged in a one-to-one correspondence, the controller is also used to according to pixel unit grayscale to display, generate with
The corresponding public voltage signal of grayscale to display.
8. the driving device of display panel according to claim 7, which is characterized in that further include:
Memory, for storing the corresponding relationship of grayscale and voltage value set；
The controller is also used to the corresponding relationship of the grayscale and voltage value set according to the pre-stored data, and determination to be shown
The corresponding voltage value set of grayscale, each voltage value set includes multiple voltage values, and be based on the multiple voltage value
The public voltage signal is generated, the public voltage signal includes the several subsignals for successively continuing preset duration, the number
The voltage of a subsignal is equal with corresponding voltage value in the multiple voltage value respectively.
9. a kind of display equipment, which is characterized in that the display equipment includes such as the described in any item displays of claim 6~8
The driving device of panel.
10. display equipment according to claim 9, which is characterized in that the display equipment further includes display panel, described
Display panel includes more public electrode wires, more data lines and Duo Gen scan line, more public electrode wires and described more
The distribution of root data line alternate intervals, the more data lines and the more scan lines intersect and limit multiple pixel regions
Domain is provided with a pixel unit in each pixel region, and the pixel unit includes public electrode, pixel electrode,
One thin film transistor (TFT) and the second thin film transistor (TFT),
In the same pixel unit, the pixel electrode is connect with the first pole of the first film transistor, described
Second pole of first film transistor is connected with the corresponding data line, the control electrode of the first film transistor with it is corresponding
The scan line connection,
In the same pixel unit, the public electrode is connect with the first pole of second thin film transistor (TFT), described
Second pole of the second thin film transistor (TFT) is connected with the corresponding public electrode wire, the control electrode of second thin film transistor (TFT) with
The corresponding scan line connection.
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| CN109036315B (en) | 2021-12-10 |
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