CN100573244C - Liquid crystal indicator and driving method thereof - Google Patents
Liquid crystal indicator and driving method thereof Download PDFInfo
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- CN100573244C CN100573244C CNB2006101575571A CN200610157557A CN100573244C CN 100573244 C CN100573244 C CN 100573244C CN B2006101575571 A CNB2006101575571 A CN B2006101575571A CN 200610157557 A CN200610157557 A CN 200610157557A CN 100573244 C CN100573244 C CN 100573244C
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Abstract
The invention provides a kind of liquid crystal indicator and driving method thereof, this liquid crystal indicator comprises a data drive circuit, a public voltage generating circuit, many data lines, a plurality of pixel electrode and public electrodes.This data drive circuit provides data voltage by these many data lines for these a plurality of pixel electrodes, and this public voltage generating circuit provides common electric voltage for this public electrode.At any frame, this common electric voltage is pressed and one be that the periodically variable secondary common electric voltage of a minimum period is formed by stacking with a plurality of continuous frame periods by constant Your Majesty's common-battery, the difference that the absolute value of this pair common electric voltage is pressed less than data voltage and Your Majesty's common-battery in any frame, in the one-period of this common electric voltage, this pair common electric voltage value is that positive number of times equals the number of times of its value for bearing.
Description
Technical field
The present invention relates to a kind of liquid crystal indicator and driving method thereof.
Background technology
Liquid crystal indicator has characteristics such as low diathermaneity, compact and power consumption are low because of it, and is therefore day by day extensive in the use, and along with the ripe and innovation of correlation technique, its kind is also various day by day.
See also Fig. 1, it is a kind of structural representation of prior art liquid crystal indicator.This liquid crystal indicator 10 comprises one first substrate 11, a public electrode 12, one first both alignment layers 13, a liquid crystal layer 14, one second both alignment layers 15, a plurality of pixel electrode 16 and one second substrate 17.This first substrate 11 is oppositely arranged with this second substrate 17, and this liquid crystal layer 14 is between this first, second substrate 11,17.This public electrode 12 and this first both alignment layers 13 are set in turn in the inner surface of this first substrate 11 from top to bottom, and these a plurality of pixel electrodes 16 and this second both alignment layers 15 are set in turn in the inner surface of this second substrate 17 from bottom to up.Each pixel electrode 16, the liquid crystal molecule corresponding and part public electrode 12 formations one pixel corresponding with this pixel electrode 16 with this pixel electrode 16.
These a plurality of pixel electrodes 16 provide data voltage by a data drive circuit respectively for it, this public electrode 12 provides common electric voltage by a public voltage generating circuit for it, when pixel electrode 16 and public electrode 12 are loaded with data voltage and common electric voltage, 12 of this pixel electrode 16 and this public electrodes produce an electric field, the deflection of this electric field controls liquid crystal molecule to be realizing bright dark control, thereby makes liquid crystal indicator 10 demonstrate image.
See also Fig. 2, it is the oscillogram of the pixel institute loaded data voltage and the common electric voltage of liquid crystal indicator shown in Figure 1.At the n-1 frame, the pixel electrode 16 of this pixel loads a positive voltage Vdata1, and this public electrode 12 loads a positive voltage Vcom, wherein, and Vcom＞Vdata1.At the n frame, the pixel electrode 16 of this pixel loads a positive voltage Vdata2, and this public electrode 12 loads a positive voltage Vcom, wherein, and Vdata2＞Vcom, and Vdata2-Vcom=Vcom-Vdata1.At the n+1 frame, the pixel electrode 16 of this pixel loads a positive voltage Vdata1, and this public electrode 12 loads a positive voltage Vcom.Promptly the situation of n+1 frame is identical with the n-1 frame, so just finishes once circulation.Each frame repeats above rule later on.
By above-mentioned driving process as can be known, at any frame, the direction of the electric field intensity that this pixel electrode 16 and public electrode are 12 changes frame by frame, but its size is constant.For liquid crystal molecule, when the direction of electric field intensity constantly changes and big or small when constant, the angle of its rotation is identical.There is foreign ion in the liquid crystal layer 14 of liquid crystal indicator in the actual product, and first, second both alignment layers 13, the 15th, organic material is made, therefore this first, second both alignment layers 13,15 can capture the foreign ion in the liquid crystal layer 14, when the electric field intensity of 12 of pixel electrode 16 and public electrodes big or small constant, the angle that liquid crystal molecule rotates is also constant, be that liquid crystal molecule rests on same position all the time, liquid crystal molecule hinders less to the motion of foreign ion, what the foreign ion meeting in the liquid crystal layer 14 was a large amount of accumulates in first, second both alignment layers 13, on 15, this is first years old, second both alignment layers 13,15 form a residual DC electric field.When the electric field change of 12 of pixel electrode 16 and public electrodes, the residual DC electric field of 13,15 formation of this first, second both alignment layers still exists, the corresponding meeting of liquid crystal molecule turns an angle, even keeps original invariant position, thereby produces afterimage phenomenon.
Summary of the invention
In order to solve the image residue problem of liquid crystal indicator in the prior art, the invention provides a kind of liquid crystal indicator that can effectively improve afterimage phenomenon.
Be necessary to provide a kind of driving method of this liquid crystal indicator simultaneously.
A kind of liquid crystal indicator, it comprises a data drive circuit, a public voltage generating circuit, many data lines, a plurality of pixel electrode and public electrodes.This data drive circuit provides data voltage by these many data lines for these a plurality of pixel electrodes, and this public voltage generating circuit provides common electric voltage for this public electrode.At any frame, this common electric voltage is pressed and one be that the periodically variable secondary common electric voltage of a minimum period is formed by stacking with a plurality of continuous frame periods by constant Your Majesty's common-battery, the difference that the absolute value of this pair common electric voltage is pressed less than data voltage and Your Majesty's common-battery in any frame, in the one-period of this common electric voltage, this pair common electric voltage value is that positive number of times equals the number of times of its value for bearing.
A kind of liquid crystal display apparatus driving circuit, the liquid crystal indicator of using this driving method comprises a data drive circuit, a public voltage generating circuit, many data lines, a plurality of pixel electrode and public electrodes.During this liquid crystal indicator operate as normal, this data driving circuit provides data voltage by these many data lines for these a plurality of pixel electrodes, and this public voltage generating circuit provides common electric voltage for this public electrode.At any frame, this common electric voltage is pressed and one be that the periodically variable secondary common electric voltage of a minimum period is formed by stacking with a plurality of continuous frame periods by constant Your Majesty's common-battery, the difference that the absolute value of this pair common electric voltage is pressed less than data voltage and Your Majesty's common-battery in any frame, in the one-period of this common electric voltage, this pair common electric voltage value is that positive number of times equals the number of times of its value for bearing.
Compared with prior art, liquid crystal indicator of the present invention and driving method thereof make common electrical be pressed with a small change, the size of the electric field intensity between pixel electrode and public electrode also has a small change, the rotational angle of liquid crystal molecule also should have a small variation mutually, and the optical characteristics that this small variation causes can not discovered human eye, does not therefore influence display effect.Because the rotational angle of liquid crystal molecule has small variation, so can increase the random encounters probability that reaches between foreign ion in the liquid crystal layer between foreign ion and liquid crystal molecule, the concentration that minimizing is adsorbed by first, second both alignment layers, also corresponding the reducing of residual DC electric field intensity that forms between this first, second both alignment layers, thus the afterimage phenomenon of liquid crystal indicator effectively improved.
Description of drawings
Fig. 1 is a kind of structural representation of prior art liquid crystal indicator.
Fig. 2 is the oscillogram of the pixel institute loaded data voltage and the common electric voltage of liquid crystal indicator shown in Figure 1.
Fig. 3 is the structural representation of liquid crystal indicator of the present invention.
Fig. 4 is the electrical block diagram of liquid crystal indicator of the present invention.
Fig. 5 is the oscillogram of the pixel institute loaded data voltage and the common electric voltage of liquid crystal indicator shown in Figure 3.
Fig. 6 is a kind of particular circuit configurations synoptic diagram of public voltage generating circuit shown in Figure 4.
Fig. 7 is the input signal oscillogram of this first, second controlling signal input end.
Fig. 8 is the another kind of oscillogram of the gray scale voltage that pixel loaded and the common electric voltage of liquid crystal indicator shown in Figure 3.
Embodiment
See also Fig. 3, it is the structural representation of liquid crystal indicator of the present invention.This liquid crystal indicator 20 comprises one first substrate 21, a public electrode 22, one first both alignment layers 23, a liquid crystal layer 24, one second both alignment layers 25, a plurality of pixel electrode 26 and one second substrate 27.This first substrate 21 is oppositely arranged with this second substrate 27, and this liquid crystal layer 24 is between this first, second substrate 21,27.This public electrode 22 and this first both alignment layers 23 are set in turn in the inner surface of this first substrate 21 from top to bottom, and this pixel electrode 26 and this second both alignment layers 25 are set in turn in the inner surface of this second substrate 27 from bottom to up.One pixel electrode 26, the liquid crystal molecule corresponding and part public electrode 22 formations one pixel corresponding with this pixel electrode 26 with this pixel electrode 26.
See also Fig. 4, it is the electrical block diagram of liquid crystal indicator of the present invention.This liquid crystal indicator 20 comprises a control circuit 31, scan driving circuit 32, one data drive circuit 33, one public voltage generating circuit 34, the sweep trace 201 that multirow is parallel to each other, the data line 202 that multiple row is parallel to each other and intersects with 201 insulation of this sweep trace respectively, the thin film transistor (TFT) 206 of this sweep trace 201 of a plurality of vicinities and these data line 202 infalls, a plurality of pixel electrodes 26, one public electrode 22 that is oppositely arranged with these a plurality of pixel electrodes 26 and be sandwiched in this two electrode 26, liquid crystal molecule between 22.
Extraneous signal is imported this control circuit 31, and this control circuit 31 sends a controlling signal and controls this scan drive circuit 32 and these data driving circuit 33 work, and transmits corresponding document signal to this data driving circuit 33.The scanning voltage of these scan drive circuit 32 outputs loads on the grid of corresponding thin film transistor (TFT) 206 by this multi-strip scanning line 201, corresponding thin film transistor (TFT) 206 is opened, the data voltage of these data drive circuit 33 outputs loads on the source electrode of corresponding thin film transistor (TFT) 206 by these many data lines 202, if this moment, this thin film transistor (TFT) 206 was in open mode, then this data voltage can be sent to the drain electrode of this thin film transistor (TFT) 206 and load on this pixel electrode 26.This public voltage generating circuit 34 produces a common electric voltage simultaneously and loads on this public electrode 22, so 22 of this pixel electrode 26 and this public electrodes can produce the rotation of an electric field with the control liquid crystal molecule.
See also Fig. 5, it is the oscillogram of the pixel institute loaded data voltage and the common electric voltage of liquid crystal indicator shown in Figure 3.At the n-2 frame, the pixel electrode 26 of this pixel loads a positive voltage Vdata1, and this public electrode 22 loads a positive voltage Vcom, wherein, and Vcom＞Vdata1.At the n-1 frame, the pixel electrode 26 of this pixel loads a positive voltage Vdata2, and this public electrode 22 loads a positive voltage Vcom-Va, wherein, Vdata2＞Vcom, Va is greater than 0 volt and less than 5 percent of this common electric voltage Vcom, and Vdata2-Vcom=Vcom-Vdata1.At the n frame, the pixel electrode 26 of this pixel loads a positive voltage Vdata1, and this public electroplax 22 loads a positive voltage Vcom.At the n+1 frame, the pixel electrode 26 of this pixel loads a positive voltage Vdata2, and this public electrode 22 loads a positive voltage Vcom+Va.At the n+2 frame, the pixel electrode 26 of this pixel loads a positive voltage Vdata1, and this public electrode 22 loads a positive voltage Vcom, and promptly the situation of n+2 frame is identical with the n-2 frame, so just finishes a circulation.Each frame repeats above rule later on.
Under effect of electric field, liquid crystal molecule is polarized, and the liquid crystal molecule equivalence is an electric dipole, and at the n-2 frame, direction of an electric field points to pixel electrode 26 by public electrode 22, and liquid crystal molecule rotates in electric field, and the angle of rotation is by the size decision of electric field.Suppose that now the pixel electrode 26 and the spacing of public electrode 22 are d, then electric field level is
The electric dipole moment of liquid crystal molecule and the angle of electric field are θ.
At the n-1 frame, direction of an electric field points to public electrode 22 by pixel electrode 26, and this moment, electric field level was
The electric dipole moment of liquid crystal molecule and the angle of electric field are (θ-φ).
At the n frame, direction of an electric field points to pixel electrode 26 by public electrode 22, and this moment, electric field level was
The electric dipole moment of liquid crystal molecule and the angle of electric field are θ.
At the n+1 frame, direction of an electric field points to public electrode 22 by pixel electrode 26, and this moment, electric field level was
The electric dipole moment of liquid crystal molecule and the angle of electric field are (θ+φ).
At the n+2 frame, direction of an electric field points to pixel electrode 26 by public electrode 22, and this moment, electric field level was
The electric dipole moment of liquid crystal molecule and the angle of electric field are θ.
Can draw thus: when electric field level has minor alteration
The time, the rotational angle of liquid crystal molecule also should have minor alteration φ mutually.And this small variation human eye can not discovered, and does not therefore influence display effect.Because liquid crystal molecule is not to rest on same position all the time, so the random encounters probability that reaches between foreign ion and liquid crystal molecule between foreign ion in the liquid crystal layer 24 can increase, foreign ion is by the corresponding minimizing of probability of both alignment layers 23,25 absorption in the liquid crystal layer 24, by also corresponding the reducing of the formed residual DC electric field intensity of foreign ion of both alignment layers 23,25 absorption, thereby effectively improved the afterimage phenomenon of liquid crystal indicator.
See also Fig. 6, it is a kind of particular circuit configurations synoptic diagram of public voltage generating circuit shown in Figure 4.This public voltage generating circuit 34 comprises a power input 301, an operational amplifier 302, one first controlling signal input end 303, one second controlling signal input end 304, transistor Q1, transistor Q2, resistance R 1, resistance R 2, resistance R 0, resistance R 3 and resistance R 4, wherein, this power input 301 receives a voltage Vdd, this resistance R 0 is a variable resistor, and this resistance R 3 equates with the resistance value of resistance R 4.This resistance R 1, resistance R 2, resistance R 0, resistance R 3 and resistance R 4 are serially connected between this power input 301 and the ground successively, promptly form a bleeder circuit.The source electrode of this transistor Q1, drain electrode are in parallel with this resistance R 3, and its grid is as this first controlling signal input end 303, the source electrode of this transistor Q2, drain in parallelly with this resistance R 4, and its grid is as this second controlling signal input end 304.Tool one node is connected the in-phase input end of this operational amplifier 302 between this resistance R 1 and the resistance R 2, and the inverting input of this operational amplifier 302 connects its output terminal, and common electric voltage is from this output terminal output.
See also Fig. 7, it is the input signal oscillogram of this first, second controlling signal input end.The course of work of this public voltage generating circuit 34 now is described in conjunction with Fig. 6 in the lump.At the n-2 frame, this first controlling signal input end 303 receives a high level, and this second controlling signal input end 304 receives a low level, this transistor Q1 conducting, transistor Q2 closes, resistance R 3 is by short circuit, this moment output terminal 302 output voltage values
This moment Vout=Vcom.At the n-1 frame, this first controlling signal input end 303 receives a high level, and this second controlling signal input end 304 receives a high level, this transistor Q1 conducting, transistor Q2 conducting, resistance R 3 and resistance R 4 be by short circuit, this moment output terminal 302 output voltage values
This moment Vout=Vcom-Va.At the n frame, this first controlling signal input end 303 receives a low level, and this second controlling signal input end 304 receives a high level, and this transistor Q1 closes, transistor Q2 conducting, resistance R 4 is by short circuit, this moment output terminal 302 output voltage values
This moment Vout=Vcom.At the n+1 frame, this first controlling signal input end 303 receives a low level, and this second controlling signal input end 304 receives a low level, and this transistor Q1 closes, and transistor Q2 closes, at this moment the output voltage values of output terminal 302
This moment Vout=Vcom+Va.The situation of n+2 frame and the situation of n-2 frame are identical.
Compared with prior art, the driving method of liquid crystal indicator 20 of the present invention makes common electrical be pressed with a small change, the size of the electric field intensity that pixel electrode 26 and public electrode are 22 also has a small change, the rotational angle of liquid crystal molecule also should have a small variation mutually, and this small variation human eye can not discovered, and does not therefore influence display effect.Because the rotational angle of liquid crystal molecule has small variation, so can increase the random encounters probability that reaches between foreign ion in the liquid crystal layer 24 between foreign ion and liquid crystal molecule, minimizing is by the concentration of first, second both alignment layers 23,25 absorption, also corresponding the reducing of residual DC electric field intensity of 23,25 formation of this first, second both alignment layers, thus the afterimage phenomenon of liquid crystal indicator 20 effectively improved.
The common electrical that common electrode of liquid crystal display device 22 of the present invention is loaded is pressed with multiple version, now provides another kind of version, as shown in Figure 8.At the n-2 frame, the pixel electrode 26 of this pixel loads a positive voltage Vdata1, and this public electrode 22 loads a positive voltage Vcom-Vb, wherein, Vcom＞Vdata1, Vb is greater than 0 volt and less than 5 percent of this common electric voltage Vcom.At the n-1 frame, the pixel electrode 26 of this pixel loads a positive voltage Vdata2, and this public electrode 22 loads a positive voltage Vcom-Vb, wherein, and Vdata2＞Vcom, and Vdata2-Vcom=Vcom-Vdata1.At the n frame, the pixel electrode 26 of this pixel loads a positive voltage Vdata1, and this public electrode 22 loads a positive voltage Vcom+Vb.At the n+1 frame, the pixel electrode 26 of this pixel loads a positive voltage Vdata2, and this public electrode 22 loads a positive voltage Vcom+Vb.At the n+2 frame, the pixel electrode 26 of this pixel loads a positive voltage Vdata1, and this public electrode 22 loads a positive voltage Vcom-Vb, and promptly the situation of n+2 frame is identical with the n-2 frame, so just finishes a circulation.Each frame repeats above rule later on.
The Changing Pattern that to sum up can sum up this common electric voltage is: at any frame, it is that the periodically variable secondary common electric voltage (Va or Vb) of a minimum period is formed by stacking with one with a plurality of continuous frame periods that this common electric voltage is pressed (Vcom) by constant Your Majesty's common-battery, this pair common electric voltage (Va or Vb) is pressed the difference of (Vcom) less than data voltage (Vdata1 or Vdata2) in any frame and Your Majesty's common-battery, in one-period, this pair common electric voltage (Va or Vb) value is that positive number of times equals the number of times of its value for bearing.
Claims (10)
1. liquid crystal indicator, it comprises a data drive circuit, one public voltage generating circuit, many data lines, a plurality of pixel electrodes and a public electrode, this data drive circuit provides data voltage by these many data lines for these a plurality of pixel electrodes, this public voltage generating circuit provides common electric voltage for this public electrode, it is characterized in that: at any frame, this common electric voltage is pressed and one be that the periodically variable secondary common electric voltage of a minimum period is formed by stacking with a plurality of continuous frame periods by constant Your Majesty's common-battery, the difference that the absolute value of this pair common electric voltage is pressed less than data voltage and Your Majesty's common-battery in any frame, in the one-period of this common electric voltage, this pair common electric voltage value is that positive number of times equals the number of times of its value for bearing.
2. liquid crystal indicator as claimed in claim 1 is characterized in that: the absolute value of this pair common electric voltage is less than 5 percent of Your Majesty's common-battery pressure.
3. liquid crystal indicator as claimed in claim 1 or 2, it is characterized in that: this public voltage generating circuit comprises a power input, one first controlling signal input end, one second controlling signal input end, transistor Q1, transistor Q2, resistance R 1, resistance R 2, resistance R 0, resistance R 3, a resistance R 4 and an operational amplifier, this resistance R 1, resistance R 2, resistance R 0, resistance R 3 and resistance R 4 are serially connected between this power input and the ground successively, the source electrode of this transistor Q1, it is in parallel with this resistance R 3 to drain, its grid is as this first controlling signal input end, the source electrode of this transistor Q2, it is in parallel with this resistance R 4 to drain, its grid is as this second controlling signal input end, have the in-phase input end that a node is connected this operational amplifier between this resistance R 1 and the resistance R 2, the inverting input of this operational amplifier connects its output terminal.
4. liquid crystal indicator as claimed in claim 3 is characterized in that: this resistance R 0 is a variable resistor, and this resistance R 3 equates with the resistance value of resistance R 4.
5. liquid crystal display apparatus driving circuit, it is characterized in that: the liquid crystal indicator of using this driving method comprises a data drive circuit, one public voltage generating circuit, many data lines, a plurality of pixel electrodes and a public electrode, during this liquid crystal indicator operate as normal, this data driving circuit provides data voltage by these many data lines for these a plurality of pixel electrodes, this public voltage generating circuit provides common electric voltage for this public electrode, at any frame, this common electric voltage is pressed and one be that the periodically variable secondary common electric voltage of a minimum period is formed by stacking with a plurality of continuous frame periods by constant Your Majesty's common-battery, the difference that the absolute value of this pair common electric voltage is pressed less than data voltage and Your Majesty's common-battery in any frame, in the one-period of this common electric voltage, this pair common electric voltage value is that positive number of times equals the number of times of its value for bearing.
6. liquid crystal display apparatus driving circuit as claimed in claim 5 is characterized in that: the absolute value of this pair common electric voltage is less than 5 percent of Your Majesty's common-battery pressure.
7. as claim 5 or 6 described liquid crystal display apparatus driving circuits, it is characterized in that: definition is an one-period from the n-2 frame to the n+1 frame, and at the n-2 frame, this Your Majesty's common-battery is pressed and is Vcom, and this pair common electric voltage is 0; At the n-1 frame, this Your Majesty's common-battery is pressed and is that Vcom, this pair common electric voltage are-Va, and Va presses the difference of Vcom less than this data voltage and Your Majesty's common-battery; At the n frame, this Your Majesty's common-battery is pressed and is Vcom, and this pair common electric voltage is 0; At the n+1 frame, this Your Majesty's common-battery is pressed and is Vcom, and this pair common electric voltage is+Va.
8. liquid crystal display apparatus driving circuit as claimed in claim 7 is characterized in that: at the n-2 frame, the pixel electrode of a certain pixel loads a positive voltage Vdata1, and Vcom＞Vdata1; At the n-1 frame, the pixel electrode of this pixel loads a positive voltage Vdata2, and Vdata2＞Vcom, Vdata2-Vcom=Vcom-Vdata1; At the n frame, the pixel electrode of this pixel loads a positive voltage Vdata1; At the n+1 frame, the pixel electrode of this pixel loads a positive voltage Vdata2.
9. as claim 5 or 6 described liquid crystal display apparatus driving circuits, it is characterized in that: this public voltage generating circuit comprises a power input, one first controlling signal input end, one second controlling signal input end, transistor Q1, transistor Q2, resistance R 1, resistance R 2, resistance R 0, resistance R 3, a resistance R 4 and an operational amplifier, this resistance R 1, resistance R 2, resistance R 0, resistance R 3 and resistance R 4 are serially connected between this power input and the ground successively, the source electrode of this transistor Q1, it is in parallel with this resistance R 3 to drain, its grid is as this first controlling signal input end, the source electrode of this transistor Q2, it is in parallel with this resistance R 4 to drain, its grid is as this second controlling signal input end, have the in-phase input end that a node is connected this operational amplifier between this resistance R 1 and the resistance R 2, the inverting input of this operational amplifier connects its output terminal.
10. liquid crystal display apparatus driving circuit as claimed in claim 9 is characterized in that: this resistance R 0 is a variable resistor, and this resistance R 3 equates with the resistance value of resistance R 4.
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| CNB2006101575571A CN100573244C (en) | 2006-12-15 | 2006-12-15 | Liquid crystal indicator and driving method thereof |
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| CNB2006101575571A CN100573244C (en) | 2006-12-15 | 2006-12-15 | Liquid crystal indicator and driving method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104952415A (en) * | 2015-05-05 | 2015-09-30 | 友达光电股份有限公司 | Common potential generating circuit and display device using the same |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102654663B (en) * | 2011-05-11 | 2015-02-11 | 京东方科技集团股份有限公司 | Driving method and driving device for thin film transistor liquid crystal display |
| CN103632636A (en) * | 2012-08-28 | 2014-03-12 | 群康科技(深圳)有限公司 | Protection device |
| CN110136670A (en) * | 2019-05-22 | 2019-08-16 | 京东方科技集团股份有限公司 | Driving method, driving circuit and display device |
| CN114637138B (en) * | 2022-03-31 | 2023-05-30 | 广州华星光电半导体显示技术有限公司 | Liquid crystal display panel and driving method thereof |
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| CN104952415A (en) * | 2015-05-05 | 2015-09-30 | 友达光电股份有限公司 | Common potential generating circuit and display device using the same |
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