JP3515201B2 - Liquid crystal display device and driving method thereof - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION Liquid crystal display devices are widely applied as low power consumption flat panel displays. Among them, the active matrix system in which a switching element is built in each pixel and driven is being used as a large-capacity and high-quality display element in televisions, information terminals, and the like.

Further, a non-linear resistance element such as a three-terminal type thin film transistor (hereinafter referred to as TFT) and a two-terminal type diode or a metal insulator metal (hereinafter referred to as MIM) is used as a switching element.
The terminal type is easier to manufacture than the three-terminal type and is expected in the future. The present invention relates to a two-terminal type active matrix liquid crystal display device using a two-terminal type switching element and a driving method thereof.

[0003]

2. Description of the Related Art FIG. 3 shows a block diagram of an active matrix liquid crystal display device using a two-terminal type switching element. The matrix display panel 3 has data lines D1 and D
2 ,. ． , DM and scan lines S1, S2 ,. ． , SN are arranged in a matrix, and the liquid crystal pixels 1 and the two-terminal type switching elements 2 are installed corresponding to the intersections.

The data lines D1, D2 ,. ． , DM is supplied with a data signal from the data line driver circuit 4, and scan lines S1, S2 ,. ． , SN is supplied with a scanning signal from the scanning line driver circuit 5, and the data line driver circuit 4 and the scanning line driver circuit 5 are connected to a control circuit and a power supply circuit 6 for processing a clock and a video signal 7.

As the two-terminal type switching element, an MIM element having a metal-insulator-metal (conductor) structure and a non-linear current-voltage characteristic is often used. MI
As a typical structure of the M element, a lower electrode Ta, an anodic oxide film (TaOx) of Ta as an insulating film, and an ITO (transparent conductor) as an upper electrode are provided, and two patterns (masks) are provided.
Can be manufactured in.

Japanese Patent Laid-Open No. 59-57288 discloses an example of using a conventional two-terminal type switching element. FIG. 4 shows a scanning signal waveform and a data signal waveform in a driving method of a conventional two-terminal type active matrix liquid crystal display device such as a diode or MIM.

Scan signals φ (n), φ (n + 1), φ (n
+2) are scanning signals applied to the scanning lines Sn, Sn + 1, Sn + 2 of the nth row, the n + 1th row and the n + 2th row, respectively. Negative polarity selection periods S (n) and S '(n
+1) and S (n + 2), the second selection potential Vs2 is changed to the positive selection period S ′ (n), S (n + 1), S ′ (n +
In 2), the first selection potential Vs1 is taken.

On the other hand, holding periods H (n) and H '(n +
1) and H (n + 2) take the second holding potential Vh2, and the holding periods H '(n), H (n + 1), and H' (n + 2) take the first holding potential Vh1.

The data signal D (m) applied to the data line Dm in the m-th column has a potential between the first data potential Vd1 and the second data potential Vd2 as shown in the figure. For the gradation display, either amplitude modulation or pulse width modulation is used, and the latter example is shown in FIG. VG is a reference potential,
In FIG. 4, the potential is drawn at a constant potential, but even if it fluctuates in the entire system, it is in principle equivalent, so it is often varied depending on the relationship of the power supply voltage of the driver circuit.

In FIG. 4, the first selection potential Vs1, the second selection potential Vs2, the first holding potential Vh1 and the second holding potential Vh2 are shown symmetrically with respect to the reference potential, but they are two-terminal type. When the characteristics of the switching element are asymmetric, they may be asymmetric.

In the conventional example shown in FIG. 4, the nth row, n +
Continuous selection periods S (n), S (n + 1), S (n + 2) corresponding to the first and n + 2th scanning lines and selection periods S ′ (n), S ′ (n + 1), S ′ ( The polarity of the selection potential with (n + 2) is inverted, which corresponds to the example of inversion for each row.
In many cases, every field is reversed.

The biggest problem in an active matrix liquid crystal display device using a two-terminal type switching element, especially when using MIM as a switching element, is image sticking or an afterimage phenomenon.

FIG. 5 is a diagram for explaining the burning problem of the conventional example. FIG. 5A is a graph showing the state of the transmittance with respect to the ideal time. FIG. 5B is a graph showing the state of transmittance with respect to actual time.

In the case of normally white display, the change in transmittance shown in FIG. 5 (a), that is, in the case of sequentially displaying white, halftone, black, and halftone, the actual change in transmittance is shown in FIG. 5 (b). Therefore, the change in the transmittance of the intended ideal image does not match that in FIG. When the image changes from white to halftone, an image slightly darker than the halftone is burned in for a certain period such as 17, and conversely, when it is changed from black to halftone, an image slightly brighter than the halftone is burned for a certain period such as 18.

This is the threshold voltage Vth of the switching element.
Is due to change. This change depends on the amount of current flowing through the switching element. When the amount of current is large, the threshold voltage Vth tends to increase when the current amount is large, and conversely, the threshold voltage Vth tends to decrease for a small amount of current.

FIG. 6 is a waveform diagram showing a scanning signal waveform and a data signal waveform in a conventional example for reducing burn-in in a driving method of a two-terminal type active matrix liquid crystal display device.

Scan signals φ (n), φ (n + 1), φ (n
+2) are scanning signals applied to the scanning lines Sn, Sn + 1, Sn + 2 of the nth row, the n + 1th row and the n + 2th row, respectively. Negative polarity selection periods S (n) and S '(n
+1) and S (n + 2), the second selection potential Vs2 is changed to the positive selection period S ′ (n), S (n + 1), S ′ (n +
In 2), the first selection potential Vs1 is taken.

On the other hand, holding periods H (n) and H '(n +
1) and H (n + 2) take the second holding potential Vh2, and the holding periods H '(n), H (n + 1), and H' (n + 2) take the first holding potential Vh1.

The data signal D (m) applied to the data line Dm in the m-th column has a potential between the first data potential Vd1 and the second data potential Vd2 as in the conventional example of FIG.

The driving waveform of FIG. 6 is characterized by the scanning signals φ (n), φ (n + 1), and φ (n + 2) having positive polarity selection periods S (n) and S ′ (n + 1), respectively. ),
Before S (n + 2), a negative polarity current application period I (n),
I '(n + 1), I (n + 2), negative selection period S'
Before (n), S (n + 1), S '(n + 2), the positive current application period I' (n), I (n + 1), I '(n +
2).

In the driving method of the conventional example shown in FIG. 6, it is expected that the characteristic change of the element will be saturated and the image sticking will be suppressed by forcing a current to flow through the switching element during this current application period. ing.

[0022]

In the driving method of the conventional example shown in FIG. 4, the amount of current flowing through the switching element varies depending on the gradation displayed on the liquid crystal pixel, and the burn-in phenomenon cannot be eliminated.

On the other hand, in the driving method of the conventional example shown in FIG. 6, let us consider a case where the area from the scanning line Sn-1 to the scanning line Sn + 2 is white displayed. In the case of normally white display, a data potential having the same polarity as the polarity of the selection potential of the scanning line is selected as the data signal corresponding to white display, so the selection period S
In (n-1), S (n), S (n + 1), and S (n + 2), the data signal D (m) is the first data potential V, respectively.
d1, second data potential Vd2, first data potential Vd
It takes the first and second data potentials Vd2.

Similarly, the selection periods S '(n-1), S'.
In (n), S '(n + 1), and S' (n + 2), the data signal D (m) has the second data potential Vd2, the first data potential Vd1, the second data potential Vd2, and the first data potential, respectively. Take Vd1.

That is, in the white display region, the voltage difference between the scanning signal φ (n) and the data signal D (m) corresponding to the voltage applied to the liquid crystal pixel and the switching element in the selection period is Vs2-Vd2 or Has a small absolute value of Vs1-Vd1.

On the other hand, in the black display region, the voltage difference between the scanning signal φ (n) and the data signal D (m) corresponding to the voltage applied to the liquid crystal pixel and the switching element in the selection period is Vs.
The absolute value increases to 2-Vd1 or Vs1-Vd2.

Further, the scanning signal φ applied to the scanning line Sn
In (n), the selection period S (n
-1), S '(n-1) is the current application period I (n), I'
Used as (n).

Therefore, the scanning signal φ corresponding to the voltage applied to the liquid crystal pixel and the switching element during the current application period.
The voltage difference between (n) and the data signal D (m) is Vs2-Vd.
The absolute value becomes 2 or Vs1-Vd1.

From the same discussion, the voltage difference between the scanning signal φ (n) and the data signal D (m) corresponding to the voltage applied to the liquid crystal pixels and the switching elements in the black display region during the current application period is Vs2-. The absolute value increases to Vd1 or Vs1-Vd2.

As described above, in the white display region, the voltage applied to the liquid crystal pixel and the switching element is small in both the selection period and the current application period, and in the black display region, both the selection period and the current application period are large. Become.

As described above, the driving method of FIG. 6 aims to suppress the burn-in by saturating the characteristic change of the element by forcibly flowing the current in the switching element during the current application period.

However, since the same display content dependency as in the selection period actually remains in the current application period as described above, the characteristic change does not easily saturate, and a sufficient effect for reducing burn-in cannot be obtained. is there.

In order to improve the above problems, it may be possible to independently set the current application period without using the selection period of another scanning line. Since the data signal during the current application period can be adjusted independently, when the voltage applied to the liquid crystal pixels and the switching elements is small during the selection period as in the white display region, it is large during the current application period and the black display region As described above, when the selection period is large, the current application period can be set to be small.

However, in such a case, the data signals in the current application period and the selection period have the same polarity, and there is a worst pattern in which the polarity of the average value of the data signal is biased depending on the data content. In such a worst case pattern, there is a problem that ugly crosstalk occurs on the screen and the display quality is impaired. Furthermore, since a part of the scanning period assigned to the scanning signal of the scanning line of one row is used as the current application period, the width of the selection period cannot be taken sufficiently, and the contrast and the viewing angle characteristics are deteriorated.

The object of the present invention is to solve the problems of the conventional examples,
An object of the present invention is to provide a liquid crystal display device capable of sufficiently reducing image sticking and suppressing crosstalk without reducing the selection period width and deteriorating contrast and viewing angle, and a driving method thereof.

[0036]

Was to achieve the above object, there is provided a means for solving]
The liquid crystal display device of the first means of the present invention is
Data lines, multiple scan lines, and the intersections of data lines and scan lines.
Liquid crystal pixel provided correspondingly and provided corresponding to liquid crystal pixel
It has a 2-terminal switching element and is applied to the scanning line.
Depending on the scanning signal and the data signal applied to the data line, the liquid
In a liquid crystal display device that drives crystal pixels,
The respective scanning signals applied to the scanning lines are respectively
In addition to applying a unique selection period and a plurality of other scanning lines
Of a plurality of scanning signals of the constant
And a polarity current application period. Furthermore
Of the second means of the present invention for achieving the above object.
The liquid crystal display device is the scanning device according to the first means of the present invention.
Before the signal is applied to the scanning line of one row or a plurality of rows
The selection having a selection potential whose polarity is inverted for each scanning signal.
Selection period and inversion of polarity applied to the other plurality of scanning lines
Of the plurality of other scanning signals that have been selected over the selection period.
And a current applying period of constant polarity.
It Furthermore, a third aspect of the present invention for achieving the above object.
The liquid crystal display device according to the second aspect of the present invention is the liquid crystal display device according to the second aspect of the present invention.
The scan signal may be another scan signal having a positive selection potential.
Other period having a negative selection potential and the selection period of the check signal
One including the selection period of the scanning signal at substantially the same time
Characterized by having a constant polarity of the current application period
It Furthermore, a fourth aspect of the present invention for achieving the above object.
The liquid crystal display device according to the first aspect is the first aspect of the present invention.
The data in the selection period for halftone display
The signal has the same polarity as the selection potential in the selection period and the opposite polarity.
Characteristic potential is included in a ratio capable of gradation display.
It Furthermore, a fifth aspect of the present invention for achieving the above object.
The liquid crystal display device according to the first aspect is the first aspect of the present invention.
The scanning signal is a positive polarity, which alternates with a constant cycle.
The selection period, the selection period of negative polarity, and the selection period of positive polarity.
Before the selection period and before the current application period of negative polarity and negative polarity
The current application period of the positive polarity prior to the selection period
It is characterized by In addition, to achieve the above objectives
The liquid crystal display device according to the sixth means of the present invention is
In the means of 5, the scanning signal is a positive electrode of the scanning signal.
Positive selection potential in the selection period of negative polarity is negative
Positive polarity of the current application period prior to the selection period
In the selection period of negative polarity, which is equal to the current applied potential,
The negative selection potential has a positive polarity and a negative polarity that precedes the selection period.
Must be equal to the negative current application potential during the current application period
Is characterized by. In addition, a book to achieve the above objectives
The liquid crystal display device of the seventh means of the invention is the same as the first method of the present invention.
In the stage, the scanning signal is alternately repeated at a constant cycle.
The selection period of positive polarity, the selection period of negative polarity, and the positive electrode
Negative polarity current application period prior to the negative polarity selection period
And the positive polarity current prior to the negative polarity current application period
Before the application period and the positive polarity prior to the selection period of the negative polarity
The current application period and the negative current that precedes the positive current application period
And the current application period of the polarity.
Further, the eighth hand of the present invention for achieving the above object.
According to the seventh aspect of the present invention, there is provided a stepped liquid crystal display device as described above.
The scanning signal is the positive polarity of the scanning signal during the selection period.
The positive selection potential is the same polarity of the current before the selection period.
The selection period of the negative polarity, which is equal to the current application potential of the application period
The negative selection potential in between has the same polarity prior to the selection period.
Must be equal to the current application potential of the same polarity during the current application period
Is characterized by.

Further, it is used to achieve the above object.
A driving method of a first means of the present invention is to provide a plurality of data lines,
Corresponding to the intersection of multiple scan lines and data lines and scan lines
Liquid crystal pixel provided and two-terminal type provided corresponding to the liquid crystal pixel
A scanning signal that has a switching element and is applied to a scanning line
And the liquid crystal pixel according to the data signal applied to the data line.
Each driving liquid crystal display device has its own selection period.
And a plurality of the other plurality of applying to the plurality of other scanning lines
A current sign of constant polarity over the selection period of the scanning signal
The scan signal having an additional period
A method for driving a liquid crystal display device, characterized in that the voltage is applied to the liquid crystal display device.
Further, the present invention used to achieve the above-mentioned object
The driving method of the means 10 is the ninth means of the present invention.
The scan signal applied to one or more scan lines.
The selection period having a selection potential whose polarity is inverted for each signal
And the polarity applied to the other plurality of scanning lines is reversed.
A constant pole over the selection period of a plurality of the scanning signals of
The scanning signal having the current applying period of
Of the liquid crystal display device characterized by applying to each scanning line
Driving method. Furthermore, it is used to achieve the above purpose
The driving method of the eleventh means of the present invention is the tenth aspect of the present invention.
Another scanning signal having a positive selection potential in the means
And the other having the selection potential of negative polarity
One including the selection period of the scanning signal at substantially the same time
The scanning signal having the current application period of constant polarity is transmitted.
Liquid crystal display characterized by being applied to each of the scanning lines
Method of driving the display device. Furthermore, in order to achieve the above objectives
The driving method of the twelfth means of the present invention used for
In the ninth means, the selection is made for displaying halftone gradation.
The potential of the same polarity as the selection potential of the period and the potential of the opposite polarity are
The data signal included in a ratio capable of gradation display within the selection period
Is applied to the data line.
Drive method. Furthermore, it is used to achieve the above objectives.
The driving method of the thirteenth means of the present invention is the ninth method of the present invention.
Before the positive polarity, which alternates with a constant cycle
The selection period, the selection period of negative polarity, and the selection period of positive polarity.
Before the selection period and before the current application period of negative polarity and negative polarity
The current application period of the positive polarity prior to the selection period
Applying the scan signal to each scan line
A method for driving a liquid crystal display device, comprising: Furthermore, above
Driving the fourteenth means of the invention used to achieve the object
The moving method is the scanning signal according to the thirteenth means of the present invention.
The positive selection potential during the selection period of positive polarity is
Of the positive current application period prior to the selection period of
Equal to the polarity of the applied current, and the negative polarity selection period
Negative selection potential in the sate precedes the positive selection period
Equal to the negative current application potential during the negative current application period
Applying the new scan signal to each scan line.
A method for driving a liquid crystal display device, comprising: Furthermore, above
Of the fifteenth means of the present invention used to achieve the object of
The driving method is the ninth means of the present invention, wherein
Alternating positive polarity selection period and negative polarity selection period
The selection period and the negative polarity prior to the selection period of the positive polarity.
Current application period and positive electrode prior to the negative current application period
Prior to the current application period of negative polarity and the selection period of negative polarity.
Positive current applying period and positive current applying period
And the current application period of the negative polarity preceding the interval.
A scanning signal is applied to each of the scanning lines.
Driving method for liquid crystal display device. In addition, achieve the above objectives
Driving method of sixteenth means of the present invention used for
Is the positive electrode of the scanning signal in the fifteenth means of the present invention.
Positive selection potential in the selection period of
Equal to the current applied potential of the previous current application period of the same polarity
The negative selection potential during the negative selection period is
Of the same polarity during the current application period before the selection period.
The scanning signal equal to the current applied potential for each scanning
Driving method of liquid crystal display device characterized by applying to line
Law .

[0038]

[0039]

[0040]

[0041]

[0042]

[0043]

[0044]

The scanning signal according to the present invention has a unique selection period and a current application period of a constant polarity that extends over the selection periods of the other plurality of scanning signals applied to the other plurality of scanning lines.

In this way, by introducing a current application period of a constant polarity that extends over the selection periods of a plurality of scanning signals and using a data signal that is inverted every row, crosstalk can be improved.
The current flowing in each current application period is substantially constant regardless of the display content, and image burn-in can be significantly reduced regardless of the display content.

By providing not only the current application period having the opposite polarity to the selection period but also the current application period having the same polarity, a large current having the opposite polarity is always applied, and a large image sticking improving effect can be obtained.

[0047]

Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 is a waveform diagram showing a scanning signal and a data signal in the embodiment of the present invention.

The scanning signals φ (n) and φ (n + 1) are scanning signals applied to the scanning lines Sn and Sn + 1 of the nth row and the n + 1th row, respectively, and each scanning signal has its own selection period.

For example, the scanning signal φ (n) has the first positive polarity
Selection period Ts1 (n) and the negative second selection period Ts
2 (n), and the scanning signal φ (n + 1) has a negative first selection period Ts1 (n + 1) and a positive second selection period Ts2 (n + 1).

Prior to each selection period, the scanning signal has a current application period of a constant polarity which extends over the selection period of the other plurality of scanning signals applied to the other plurality of scanning lines.

For example, the scanning signal φ (n) in the embodiment of the present invention is a scanning signal applied to another scanning line, specifically 1 before the positive first selection period Ts1 (n).
Scan signal φ (n-1) applied to the previous scan line Sn-1
Negative electrode across the first selection period Ts1 (n-1) and the first selection period Ts1 (n-2) of the scanning signal φ (n-2) applied to the scanning line Sn-2 two lines before. First reverse polarity current application period Ti1A (n).

Similarly, the scanning signal φ (n) is applied to the preceding scanning line Sn-1 prior to the negative selection period Ts2 (n). Second selection period Ts2 (n-1) and the second selection period Ts2 of the scanning signal φ (n-2) applied to the scanning line Sn-2 two lines before.
It has a positive polarity second current application period Ti2A (n) of the opposite polarity extending over (n-2).

There may be a plurality of current application periods described above prior to each selection period. Further, not only the current application period of the opposite polarity but also the current application period of the same polarity may exist.

Scan signal φ (n) in the embodiment of the present invention
Is a negative polarity first reverse polarity current application period Ti1A
Prior to (n), the first selection period Ts1 (n of the scanning signal φ (n-3) applied to the scanning line S (n-3) three lines before is selected.
-3) and the first selection period Ts1 (n-4) of the scanning signal φ (n-4) applied to the scanning line S (n-4) four lines before the first scanning line S (n-4). Polarity current application period Ti1
With B (n).

Similarly, the scanning signal φ (n) is supplied before the second positive polarity current application period Ti2A (n).
The scanning signal φ (n- applied to the scanning line Sn-3 three lines before
3) in the second selection period Ts2 (n-3) and the second scanning signal φ (n-4) applied to the scanning line Sn-4 four lines before.
Second negative polarity over the selection period Ts2 (n-4) of
The current application period Ti2B (n) has the same polarity as the above.

The above description is based on the scanning signal φ of the nth row.
In the description of the configuration of (n), a positive polarity selection period and a negative polarity selection period in which other scanning signals are alternately repeated at a constant cycle, and a negative polarity current application period preceding the positive polarity selection period. A positive current applying period prior to the negative current applying period, a positive current applying period preceding the negative selecting period, and a negative current applying period preceding the positive current applying period. Have

The data signals D (m), D '(m), and D "(m) applied to the m-th column data line shown in FIG. 1 are supplied from the (n-4) th scanning line to the (n + 1) th scanning line, respectively. The liquid crystal pixels corresponding to the intersections of the scanning lines and the data lines in the m-th column show data signals when the liquid crystal pixels are on, halftone, and off, respectively.

In the embodiment of the present invention, the pulse width modulation method is used as the gradation display method for displaying the halftone. Of course, the present invention is also effective for other gradation display methods such as an amplitude modulation method (pulse height modulation method) and a frame modulation method.

Each data signal corresponds to the selection period of the scanning signal applied to each scanning line, and the data potential based on the display information (ON, halftone, OFF) of the liquid crystal pixel at the intersection of the data line and the scanning line. Is taking.

Scan signal φ (n) in the embodiment of the present invention
Scan signal φ adjacent to the first selection period Ts1 (n) of
The first selection period Ts1 (n + 1) of (n + 1) and the second selection period Ts2 (n +) of the scanning signal φ (n + 1) adjacent to the second selection period Ts2 (n) of the scanning signal φ (n).
Comparing with 1), the respective potentials have opposite polarities, and an example of so-called row inversion is shown.

Therefore, the data signals D (m), D '(m),
D ″ (m) also inverts the potential in response to the inversion of the scanning signal. Of course, the present invention is not limited to the inversion for each row, but is also effective for the frame inversion and the inversion within the row.

Data signal D for turning on the pixel of the nth row
(M) is the first selection period Ts1 of the scanning signal φ (n)
A second data potential Vd2 having a polarity opposite to that of the first selection potential Vs1 of (n) is taken, while it is opposite to the second selection potential Vs2 of the second selection period Ts2 (n) of the scanning signal φ (n). The waveform has a polarity of the first data potential Vd1.

Since the embodiment of the present invention is row-wise inversion, the data signal D (m) is the scan signal φ (n-
In the first selection period Ts1 (n-1) of 1), the first data potential Vd1 is taken and the second selection period Ts1 (n-1) is taken.
Then, the waveform has the second data potential Vd2.

As described above, the data signal D (m) for turning on the pixel corresponding to a certain scanning line has a waveform having a potential opposite in polarity to the selection potential in the selection period of the scanning signal applied to the scanning line. .

The data signal D '(m) for displaying the halftone on the pixel of the n-th row is the first half of the first selection period Ts1 (n) of the scanning signal φ (n) and is the first selection period. Ts1
A second data potential Vd2 having a polarity opposite to that of the first selection potential Vs1 of (n) is taken, and the first selection of the first selection period Ts1 (n) is performed in the first half of the first selection period Ts1 (n). Potential V
The first data potential Vd1 having the same polarity as that of s1 is taken, and the pulse width ratio is adjusted according to the halftone reproduction characteristic of the liquid crystal display device.

Similarly, the data signal D '(m) in which the pixel displays halftone is the second selection period T of the scanning signal φ (n).
In the latter half of s2 (n), the first data potential Vd1 having the opposite polarity to the second selection potential Vs2 in the second selection period Ts2 (n).
In the first half of the second selection period Ts2 (n), the second
The second data potential Vd2 having the same polarity as the second selection potential Vs2 in the selection period Ts2 (n) is taken, and the pulse width ratio is adjusted according to the halftone reproduction characteristic of the liquid crystal display device.

Since the embodiment of the present invention is row-by-row inversion, the data signal D '(m) is the scan signal φ (n-
In the latter half of the first selection period Ts1 (n-1) of 1),
Data potential Vd1 of the first selection period Ts1 (n
In the first half of -1), the second data potential Vd2 is taken.

Similarly, the data signal D '(m) is n-1.
Second selection period Ts2 of scanning signal φ (n−1) of the row
In the latter half of (n-1), the second data potential Vd2 is taken,
In the first half of the second selection period Ts2 (n-1), the first data potential Vd1 is set.

In this way, the data signal D '(m) for displaying the pixels corresponding to a certain scanning line in halftone is the same as the selection potential of the selection period in the latter half of the selection period of the scanning signal applied to the scanning line. The data potential having the opposite polarity is taken, and in the first half of each selection period of each scanning signal, the ratio of the data potential having the same polarity as the selection potential in the selection period is adjusted according to the halftone reproduction characteristic.

In the embodiment of the present invention, the method of adjusting and adjusting the halftone data in the latter half of the selection period by the data potential having the opposite polarity to the selection potential in the selection period has been described. In addition, the method of adjusting the data potential having the opposite polarity to the selection potential of the selection period (center filling method) is effective in reducing the influence of the waveform rounding, and the crosstalk is improved.

The data signal D ″ (m) for turning off the pixel on the n-th row is the first selection period Ts of the scanning signal φ (n).
It takes a first data potential Vd1 having the same polarity as the first selection potential Vs1 of 1 (n), and the second selection potential Vs2 of the second selection period Ts2 (n) of the scanning signal φ (n). The waveform has a second data potential Vd2 of the same polarity.

Since the embodiment of the present invention is row-by-row inversion, the data signal D ″ (m) is the scan signal φ (n−n-th row).
In the first selection period Ts1 (n-1) of 1), the second data potential Vd2 is taken and the second selection period Ts1 (n-1) is taken.
Then, the waveform has a first data potential Vd1.

As described above, the data signal D "(m) for turning off the pixel corresponding to a certain scanning line has a waveform having the same polarity as the selection potential in the selection period of the scanning signal applied to the scanning line. There is.

FIG. 2 is a diagram showing voltage waveforms applied to the liquid crystal pixels and the switching elements according to the scanning signal and the data signal in the embodiment of the present invention.

When the liquid crystal pixels corresponding to the intersections of the scanning lines Sn-4 to Sn + 1 on the (n-4) th row to the (n + 1) th row and the data line Dm on the mth column are on, the nth row Scan line Sn
And the liquid crystal pixel corresponding to the intersection of the data line Dm in the m-th column and the switching element, the scanning signal φ (n) and the data signal D
Φ (n) -D (m), which is the difference signal of (m), is applied.

When the liquid crystal pixels corresponding to the intersections of the scanning lines Sn-4 to Sn + 1 on the (n-4) th row to the (n + 1) th row and the data line Dm on the m-th column are halftone, n A liquid crystal pixel and a switching element corresponding to the intersection of the scanning line Sn in the row and the data line Dm in the m-th column are signals φ (n) which are the difference between the scanning signal φ (n) and the data signal D ′ (m). ) -D '
(M) is applied. Similarly, from the (n-4) th row to (n +
1) If the liquid crystal pixel corresponding to the intersection of the scanning lines Sn-4 to Sn + 1 in the row and the data line Dm in the m-th column is off, n
The scanning signal φ is applied to the liquid crystal pixels and the switching elements corresponding to the intersections of the scanning lines Sn in the rows and the data lines Dm in the m columns.
Φ which is a signal of the difference between (n) and the data signal D ″ (m)
(N) -D ″ (m) is applied.

First, the writing operation and the holding operation for the liquid crystal pixels will be described. The writing operation of the scanning signal φ (n) is basically centered on the first selection period Ts1 (n) and the second selection period Ts2 (n).

In the first selection period Ts1 (n), the first selection potential Vs1− corresponds to ON, halftone, and OFF of the pixel.
The second data potential Vd2, the first selection potential Vs1− (first data potential Vd1 to the second data potential Vd2), and the first selection potential Vs1−the first data potential Vd1 are applied.

Similarly, in the second selection period Ts2 (n), the second selection potential Vs2−the first data potential Vd1 and the second selection potential Vs are also corresponded to ON, halftone, and OFF of the pixel.
2- (first data potential Vd1 to second data potential Vd
2), second selection potential Vs2-second data potential Vd2
Is applied.

A voltage obtained by removing the threshold voltage of the switching element and the capacitance couple from these voltages is written in the liquid crystal pixel, and the holding periods Th1 (n) and T1 that exist after the selection period.
It is held at h2 (n) and displayed.

In the embodiment of the present invention, different from the conventional example of FIG. 6, a plurality of selection periods of the respective other plurality of scanning signals are used as the current application period.

For example, with respect to the time widths of the first selection period Ts1 (n) and the second selection period Ts2 (n) of the scanning signal φ (n), the current application period of the first reverse characteristic preceding each of them is provided. Ti1A (n) and current application period Ti2 having the second reverse characteristic
A (n) and the current application period Ti1A having the first inverse characteristic
(N) and the second current application period Ti2A (n) having the second opposite characteristic, the first current application period Ti1B (n) having the same characteristic and the second current application period Ti2B (n) having the same characteristic The width is almost doubled.

That is, each current application period is the sum of two selection periods of the scanning signals applied to the scanning lines one row before and two rows before, or is applied to the scanning lines three rows before and four rows before. Since it takes one of the total periods of the two selection periods of the scanning signal, it is almost twice the selection period width.

In the embodiment of the present invention, the row-by-row inversion method is used. Therefore, when displaying images of the same gradation over several scanning lines, the potential of the data signal is inverted row by row. . For example, the data signals D (m) and D ′ shown in FIG.
(M) and D ″ (m) are on over multiple lines, halftone,
This is a waveform at the time of displaying OFF, and therefore the potential of the data signal is inverted for each row.

In the embodiment of the present invention, the current application period having a constant polarity is made up of two selection periods and is inverted for each row. Therefore, within each current application period, the selection period of another scanning signal is selected. Therefore, the polarities of the selection potential and the potential of the data signal are inverted.

As described above, a row-by-row inversion method is used in which two consecutive selection periods of scanning signals applied to two consecutive scanning lines are used as the current application period, and the polarity is inverted in each selection period. When using, the average voltage during the current application period applied to the liquid crystal pixel and the switching element is
It is almost always constant and does not depend on the image content of the corresponding scan line.

The pixels shown in FIG. 2 are turned on, halftone, and
First reverse polarity current application period Ti1A when off
(N) are compared with each other.

First, when the pixel is on, the scanning signal φ
(N) -In the first half of the first reverse polarity current application period Ti1A (n) in the data signal D (m), the scanning signal φ (n-
2) In order to correspond to the first selection period Ts1 (n-2), (current applied potential Vi1A)-(data potential Vd2 )
Is applied to the first half of the scanning signal φ (n-1) in the latter half.
In order to correspond to the selection period Ts1 (n-1), the voltage of (current applied potential Vi1A)-(data potential Vd1 ) is applied.

Next, when the pixel has a halftone, the scanning signal φ
(N) -In the first half of the first reverse polarity current application period Ti1A (n) in the data signal D '(m), the voltage of (current application potential Vi1A)-(data potentials Vd1 to Vd2) is applied and the second half. Is applied with a voltage of (current applied potential Vi1A)-(data potential Vd2 to Vd1).

Further, when the pixel is off, the scanning signal φ
(N) -The second half of the first reverse polarity current application period Ti1A (n) in the data signal D ″ (m) is (current application potential V
i1A) - (voltage of the data voltage Vd2) is applied, prior to
Half is (current applied potential Vi1A)-(data potential Vd1)
Is applied.

As described above, regardless of whether the pixel is on, halftone, or off, the first reverse polarity current application period Ti1A is applied.
(N) As a whole, (current applied potential Vi
1A)-(data potential Vd1) is applied and the remaining 50
In the period of%, (current applied potential Vi1A) − (data potential Vd2) is applied, and the average voltage of the whole is always almost constant. As described above, display contents (on, halftone, off)
It is possible to provide a current application period that does not depend on

Although the first current application period Ti1A (n) of the opposite polarity is taken as an example of the current application period in the above, as is apparent from FIG. 2, the first current application period Ti1B of the same polarity is obtained.
(N), the second current application period Ti2A (n) of the same polarity,
The above relationship holds in any other current application period such as the second current application period Ti2B (n) of the same polarity.

In the above embodiments, the case where the display contents of the corresponding plural lines are the same is shown. However, such an effect cannot be obtained when the display contents are reversed line by line. However, in an actual video image or the like, since the adjacent correlation is strong and the display content is hardly inverted row by row, the effect of the present invention is great.

As a result, during the current application period, almost the same current always flows through the switching element, and the image sticking can be reduced. In the conventional example, the display content dependency of the current flowing during the current application period became a problem and hindered the image sticking prevention effect, but in the present invention, such a problem is eliminated, and in any case, image sticking is significantly reduced. Can be reduced to

In the embodiment of the present invention, since the so-called row-by-row inversion method is used, the average value in the current application period unit is almost constant in the data signal of the present invention, and image-dependent crosstalk is unlikely to occur.

In the embodiment of the present invention, two current application periods are provided for each selection period. That is, the current application period of reverse polarity and the current application period of positive polarity are provided prior to the selection period. It is more than twice as effective as the single case.

In the case of the current application period having a polarity opposite to that of the selection period as in the conventional example shown in FIG. 6, the polarity becomes the same as the polarity of the selection period before the selection period, and it is difficult to flow sufficient current.

However, when the current application period having the same polarity as the selection period is provided as in the embodiment of the present invention, sufficient current flows,
Sufficient current flows for reverse charging during the subsequent reverse polarity current application period. Therefore, it is simply more than twice as effective as the single case.

As in the present invention, when the current flowing during each current application period is substantially constant regardless of the displayed contents, the current application period can be increased without causing side effects. As described above, in the present invention, the current application period is not limited to two and can be three or more.

In the embodiment of the present invention, the selection period and the current application period preceding the selection period are continuous with each other, but a period in which a current does not flow so much may be provided therebetween.
Similarly, the holding period does not have to be continuous as long as it is after the selection period.

In the embodiment of the present invention, the data signals D (m), D '(m), and D "(m) applied to the data lines of the m columns have the same data potential as in the conventional example of FIG. 4 as shown in FIG. Vd1 and Vd
The potential between 2 is taken.

For the gradation display, either amplitude modulation or pulse width modulation is used, and the latter example is shown in FIG. Of course, amplitude modulation may also be used. Further, the present invention is of course effective even if a part of frame modulation is used together or dither gradation for each pixel is used together.

In the embodiment of the present invention shown in FIG. 1, scanning signals φ (n), φ (n + 1), data signals D (m),
D ′ (m) and D ″ (m) are described by using the reference potential indicated by the alternate long and short dash line as the reference line, and the reference potential is drawn as a constant potential, but it may vary throughout the system.

Further, when the reference potential is changed, it is possible to save the withstand voltage of the drive IC, and although the drive waveforms seem to be different at first glance, they are completely equivalent. Especially effective.

In the embodiment of the present invention, the first same polarity current application potential Vi1B of the first same polarity current application period Ti1B (n) of the scanning signal φ (n) and the first selection period Ts.
1 (n) of the selection potential Vs1 and the second reverse polarity current application potential Vi of the second reverse polarity current application period Ti2A (n).
2A is described with the same potential.

Further, the second same polarity current application potential Vi2B of the second same polarity current application period Ti2B (n) of the scanning signal φ (n) and the second selection period Ts2 (n) are selected. The potential Vs2 and the first reverse polarity current application period Ti1A
The same potential is described as the first opposite polarity current application potential Vi2A of (n).

In the present invention, it is not always necessary to use these potentials in common, but the potentials described above can be shared because they function sufficiently at the same potential, and in that case, in terms of saving the number of power supplies in the circuit. It has great merit.

The present invention obtains the above effects without reducing the selection period width. The selection period in FIG. 1 covers the entire scanning period assigned to the scanning signals for one row. Therefore, as compared with the method of assigning a part of the scanning period to the correction period, sufficient writing is possible, and excellent contrast and viewing angle can be realized even in a high-density display having many scanning lines. As described above, the liquid of the present invention
The crystal display device and its driving method include a plurality of data lines and a plurality of data lines.
Provided corresponding to the intersections of scan lines and data lines and scan lines
A liquid crystal pixel and a 2-terminal switch provided corresponding to the liquid crystal pixel
A scanning element and a scanning signal applied to the scanning line.
Drive liquid crystal pixels according to the data signal applied to the data line
In the liquid crystal display device, each scanning signal applied to each scanning line is
Each number marks its own selection period and several other scan lines.
During the selection period of other multiple scanning signals whose polarity is reversed
It has a constant polarity current application period that extends over
To collect. Further, the liquid crystal display device of the present invention and its driving method.
Runs multiple data lines, multiple scan lines, and data lines.
The liquid crystal pixel provided corresponding to the intersection with the inspection line, and the liquid crystal pixel
It has a two-terminal type switching element provided correspondingly,
Scan signal applied to the scan line and data signal applied to the data line
In a liquid crystal display device that drives liquid crystal pixels according to the
And the scanning signal is applied to one or more scanning lines.
A selection period having a selection potential whose polarity is inverted for each scanning signal
And a plurality of other scanning signals applied to the other scanning lines.
The current application period of constant polarity over the selection period of
It is characterized by doing. In addition, the liquid crystal display device of the present invention
The driving method is that multiple data lines, multiple scan lines, and
A liquid crystal pixel provided corresponding to the intersection of the data line and the scanning line,
2-terminal switching element provided corresponding to liquid crystal pixel
Has a scan signal applied to the scan line and a scan signal applied to the data line.
Liquid crystal display device that drives liquid crystal pixels according to the data signal
, The scanning signal has a polarity for each row or each scanning signal.
Selection period having a selection potential that inverts and selection of positive polarity
Select period of other scan signal having potential and select voltage of negative polarity
The same time width as the selection period of another scanning signal having
And having a constant polarity current application period including
And Further, the liquid crystal display device of the present invention and its driving method are
Multiple data lines, multiple scan lines, data lines and scan lines
Corresponds to the liquid crystal pixel provided corresponding to the intersection with
And a two-terminal switching element provided as a scanning line
Scan signal applied to the data line and data signal applied to the data line
In a liquid crystal display device that drives liquid crystal pixels according to
The inspection signal is selected such that the polarity is inverted every row or every scanning signal.
Selection period having a potential, and selection potential having a positive polarity
Of the scanning signal selection period and the other having a negative selection potential
Approximately the same time width as the scanning signal selection period
The scanning signal has a constant width and a current application period with a constant polarity.
Each unique selection period and scan applied to other scan lines
The current application period of constant polarity over the signal selection period and
Data in the selected period for halftone gradation display
The signal has the same polarity as the selection potential in the selection period and the opposite polarity.
It is characterized in that the position is included in a ratio capable of gradation display. Well
In addition, the liquid crystal display device and the driving method thereof according to the present invention include a plurality of data display devices.
Data lines, multiple scan lines, and the intersections of data lines and scan lines.
Liquid crystal pixel provided correspondingly and provided corresponding to liquid crystal pixel
It has a 2-terminal switching element and is applied to the scanning line.
Depending on the scanning signal and the data signal applied to the data line, the liquid
In a liquid crystal display device that drives crystal pixels, the scanning signal is
The positive polarity selection period and the negative polarity
The selection period and the negative current mark prior to the positive selection period
Positive current application period prior to application period and negative selection period
It is characterized by having between and. In addition, the liquid crystal table of the present invention
The display device and its driving method include a plurality of data lines and a plurality of scanning lines.
Liquid crystal provided corresponding to the intersection of the line, the data line and the scanning line
Pixels and two-terminal switch provided for liquid crystal pixels
Scanning signal and data line to be applied to the scanning line
Liquid that drives liquid crystal pixels according to the data signal applied to
In a crystal display device, the scanning signals are alternately repeated at regular intervals.
The positive polarity selection period, the negative polarity selection period, and the positive polarity
Selection period of the negative polarity and the current application period of the negative polarity prior to the selection period of
The positive polarity current application period prior to the selection period.
No. of in positive the positive electrode of the selection period selection potential is negative
Positive polarity current before the selection period Positive polarity current during the application period
Equal to applied potential, negative selection during negative selection period
The potential is the negative current application period prior to the positive selection period.
It is characterized in that it is equal to the negative current application potential of. Well
In addition, the liquid crystal display device and the driving method thereof according to the present invention include a plurality of data display devices.
Data lines, multiple scan lines, and the intersections of data lines and scan lines.
Liquid crystal pixel provided correspondingly and provided corresponding to liquid crystal pixel
It has a 2-terminal switching element and is applied to the scanning line.
Depending on the scanning signal and the data signal applied to the data line, the liquid
In a liquid crystal display device that drives crystal pixels, the scanning signal is
The positive polarity selection period and the negative polarity
The selection period and the negative current mark prior to the positive selection period
And a positive polarity current prior to the negative polarity current application period.
Current and positive current prior to negative selection period
The application period and the negative polarity prior to the positive current application period
And a current application period. Also,
A bright liquid crystal display device and its driving method, a plurality of data lines,
Corresponding to the intersection of multiple scan lines and data lines and scan lines
Liquid crystal pixel provided and two-terminal type provided corresponding to the liquid crystal pixel
A scanning signal that has a switching element and is applied to a scanning line
And the liquid crystal pixel according to the data signal applied to the data line.
In a liquid crystal display device that is driven, the scanning signal has a constant cycle.
Alternating positive and negative selection periods
And the negative current application period prior to the positive selection period
And the positive polarity current application prior to the negative polarity current application period.
Period and positive current application period prior to negative selection period
And a negative current mark before the positive current application period.
In the selection period of positive polarity of the scanning signal.
Positive selection potential is the current application period of the same polarity prior to the selection period.
In the negative polarity selection period, which is equal to the current applied potential between
Negative selection potential is the same polarity current application period prior to the selection period.
It is characterized in that it is equal to the current applied potential of the same polarity.

[0109]

As described with reference to the problem of the conventional driving method in FIG. 5, the biggest problem of the active matrix liquid crystal display device using the two-terminal type switching element is image sticking and afterimage phenomenon. Threshold voltage Vth
Is changed depending on the amount of current flowing. Even when a current application period is provided for the purpose of reducing image sticking, a sufficient image sticking reduction effect cannot be obtained due to the image dependency of the current amount during the current application period, and the image dependency of the voltage value during the current application period Therefore, crosstalk is likely to occur. Further, when the scanning period per row is assigned to a period other than the selection period as a countermeasure, the contrast, the viewing angle, etc. become a problem.

In the present invention, the average voltage applied to the liquid crystal pixel and the switching element is substantially constant regardless of the display content during the current application period, so that the switching element has substantially the same current regardless of the display content. It is possible to flow
Significantly reduce the dependence of the display content on the image sticking prevention effect. Moreover, the display quality is excellent because the selection time is not reduced.

As described above, in the two-terminal active matrix liquid crystal display device and the driving method thereof according to the present invention, each scanning signal applied to each scanning line is applied to each of a plurality of other scanning lines in a specific selection period. By having a constant polarity current application period that spans other multiple scanning signal selection periods, it is possible to suppress crosstalk and effectively improve image sticking without impairing contrast and viewing angle. And

[Brief description of drawings]

FIG. 1 is a waveform diagram showing a scanning signal and a data signal in an example of the present invention.

FIG. 2 is a waveform diagram showing a voltage waveform applied to a liquid crystal pixel and a switching element according to a scanning signal and a data signal in the embodiment of the present invention.

FIG. 3 is a block diagram showing an active matrix liquid crystal display device using a two-terminal type switching element.

FIG. 4 is a scanning signal waveform and a data signal waveform in a driving method of a two-terminal type active matrix liquid crystal display device such as a diode or MIM of a conventional example.

FIG. 5 is a diagram illustrating a printing problem of a conventional example.

FIG. 6 is a drive waveform in a conventional method for driving a two-terminal active matrix liquid crystal display device.

[Explanation of symbols]

φ (n) Scan signal on the nth row φ (n + 1) Scan signal on the n + 1th row D (m) Data signal D ′ (m) when the pixel is on Data signal D ″ (m when the pixel is halftone ) Data signal Ts1 (n) when pixel is off First selection period Ts2 (n) of scanning signal of n-th row Second selection period Ts1 (n-4) n-4 of scanning signal of n-th row First selection period Ts2 (n-4) of the scanning signal of the row Second selection period Ts1 (n-3) of the scanning signal of the line n-4 First selection of the scanning signal of the line n-3 Period Ts2 (n-3) Second selection period Ts1 (n-2) of scanning signal on n-3th row First selection period Ts2 (n-2) n-2 of scanning signal on n-2th row Second selection period Ts1 (n-1) of scanning signal of row First scanning period Ts2 (n-1) of scanning signal of n-1 row Scan signal of n-1 row Second selection period Ts1 (n + 1) First selection period Ts2 (n + 1) of scanning signal of n + 1th row Second selection period Ti1A (n) of scanning signal of n + 1th row First scanning signal of nth row Reverse polarity current application period Ti2A (n) second reverse polarity current application period Ti1B (n) of the nth row scan signal first same polarity current application period Ti2B (n of the nth row scan signal ) Second same-polarity current application period Ti1A (n + 1) of n-th row scan signal First reverse-polarity current application period Ti2A (n + 1) of n + 1-th row scan signal Second of scan signal of n + 1-th row Current application period Ti1B (n + 1) of the opposite polarity of the first current application period Ti2B (n + 1) of the scanning signal of the n + 1th row and the second current application period Vs1 of the same polarity of the scanning signal of the n + 1th row of the first Selection potential Vs2 of second selection potential Vi 1A First reverse polarity current application potential Vi2A Second reverse polarity current application potential Vi1B First same polarity current application potential Vi2B Second same polarity current application potential Vh1 First holding potential Vh2 Second Holding potential Vd1 First data potential Vd2 Second data potential

Claims (16)

(57) [Claims] 1. A plurality of data lines, a plurality of scanning lines, and liquid crystal pixels provided corresponding to the intersections of the data lines and the scanning lines,
In a liquid crystal display device having a two-terminal switching element provided corresponding to a liquid crystal pixel and driving the liquid crystal pixel according to a scanning signal applied to a scanning line and a data signal applied to a data line, each of the scanning each having a unique selection period, each of the scanning signal to be applied to the line, and a current application period of a constant polarity across the selected period of another plurality of said scanning signal to be applied to the other of the plurality of the scan lines A liquid crystal display device characterized by the above. Wherein said scanning signal, one line before or multiline
Said selection period having a selection potential polarity for each of the scanning signal applied to the serial scan lines is inverted, before the polarity reversed another plurality of said scanning signal to be applied to the other of the plurality of the scan lines
The liquid crystal display device according to claim 1, characterized in that it comprises a constant of the current application period of the polarity across the serial selection period. Wherein the scanning signal comprises said selection period of the other of said scanning signal with said selected period and a negative polarity selection potential of another of said scanning signal having a positive polarity selection potential at approximately the same time the liquid crystal display device according to claim 2, characterized in that it comprises between said current application life of constant polarity. It said data signal in said selection period for displaying the gray level of 4. A halftone includes a selection potential with the same polarity potential and the opposite polarity of the potential of the selection period in the gradation visible proportions The liquid crystal display device according to claim 1, wherein the liquid crystal display device is a liquid crystal display device. Wherein said scanning signal and said selection period of a negative polarity and the selection period of the positive polarity alternately in a constant cycle,
Liquid according to claim 1, characterized in that it has a positive polarity the current application period prior to the current application period and the negative the selection period of the negative polarity prior to the selection period of the positive polarity <br/> Crystal display device. Wherein said scanning signal is positive a positive polarity the current application period of the positive polarity said selection potential in the positive during the selection period of the scanning signal prior to between the negative polarity of the election <br/>択期equal to sexual current applied potential, before a negative polarity in which the selection period selected negative in the potential of the negative polarity prior to the selection period of the positive polarity
The liquid crystal display device according to claim 5, characterized in that equal to the negative polarity of the current applied potential of the serial current application period. Wherein said scanning signal and said selection period of a negative polarity and the selection period of the positive polarity alternately in a constant cycle,
And wherein the current application period of a negative polarity prior to the selection period of the positive polarity, and the conductive <br/> current application period of the positive polarity prior to current application period of the negative polarity, positive polarity prior to the selection period of the negative polarity of
And having said current application period, and the current application period of a negative polarity prior to current application period of the positive polarity
The liquid crystal display device according to claim 1 . Wherein said scanning signal is of positive polarity of the scanning signal
The selection potential positive in the selection period equals the current applied potential of the current application period of the same polarity prior to the selection period,
The liquid crystal display device of claim 7, wherein the selection period selected negative in the negative potential is equal to or equal to the same polarity of the current applied potential of the current application period of the same polarity prior to the selection period. 9. A plurality of data lines, a plurality of scanning lines, and liquid crystal pixels provided corresponding to the intersections of the data lines and the scanning lines,
A two-terminal type switching element provided corresponding to a liquid crystal pixel, and a liquid crystal display device that drives a liquid crystal pixel according to a scanning signal applied to a scanning line and a data signal applied to a data line. Period and multiple other before
Before and a constant current application period of the polarity across the selected period of the serial scanning lines applied to other plurality of said scanning signal
The driving method of a liquid crystal display device and applying a serial scanning signal to each of run the査線. 10. polarity and the selection period having a selection potential to reverse, and the polarity to be applied to the other of the plurality of scanning lines inverted for each of the scanning signal applied to one row or multiple rows of the scanning lines and applying a plurality of other said run <br/> No. scanning signal and a said current application period of a constant polarity across said selection period of said scanning signal to each of the scan lines
The method for driving a liquid crystal display device according to claim 9 . 11. and the selection period of the other of said scanning signal with said selected period and a negative polarity said selection potential of other said run <br/> No. scanning signal having a positive polarity selection potential at approximately the same time 請 characterized by applying the scanning signal to each of the scanning lines having between said current application life of constant polarity, including
11. The method for driving a liquid crystal display device according to claim 10 . Comprising at 12. Percentage gradation can be displayed in between the election <br/>択期the selection potential with the same polarity potential and the opposite polarity of the potential of the selection period for gradation display of halftone The data signal
The method according to claim 9, wherein the voltage is applied to the data line.
Driving method of the above liquid crystal display device. 13. A positive electrode having a positive polarity which is alternately repeated at a constant cycle.
Said selection period of a negative polarity and said selection period, a negative polarity prior to the <br/> selection period of positive polarity the current application period and a negative polarity
Method for driving a liquid crystal display device according to claim 9, characterized in that for applying the scan signal and a said current application period of the positive polarity prior to the selection period, each of the scan lines. 14. The positive polarity said selection potential in the positive during the selection period of the scan signal is equal to the positive polarity of the current applied potential of positive polarity the current application period prior to the selection period of the negative polarity, - negative the selection period selected negative in the potential of sexual applying a negative polarity equal the scanning signal and the current applied potential of the current application period of a negative polarity prior to the selection period of the positive polarity to each of the scan lines Claim 1 characterized by the above-mentioned.
4. The method for driving a liquid crystal display device according to item 3 . 15. Before the positive polarity alternately in a constant cycle
Serial selection period and a negative polarity said selection period, and the current application period of a negative polarity prior between the positive polarity of the election <br/>択期, the current application period of the positive polarity prior to current application period of the negative polarity When,
A positive polarity the current application period prior to the negative polarity the selection period of the scanning signal each of the run the having said conductive <br/> current application period of a negative polarity prior to current application period of the positive polarity < The method for driving a liquid crystal display device according to claim 9 , wherein the voltage is applied to a scanning line. 16. The positive polarity said selection potential in the positive during the selection period of the scanning signal prior to the same polarity prior to the selection period
Equal to the current applied potential of the serial current application period, negative selection potential in said <br/> selection period of negative polarity is equal to the polarity of the current applied potential of the current application period of the same polarity prior to the selection period the driving method of claim 15, wherein applying the scanning signal to each of the scan lines.