JP3515200B2 - 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 throughout the 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 positive 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 FIG. 6, let us consider a case where the area from the scanning line Sn-1 to the scanning line Sn + 2 is white display. In the case of normally white display, since the data potential corresponding to the white display is the data potential having the same polarity as the polarity of the selection potential of the scanning line, the selection period S (n-1),
In S (n), S (n + 1), and S (n + 2), the data signal D (m) has a first data potential Vd1, a second data potential Vd2, a first data potential Vd1, and a second data potential, respectively. Take 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.

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, and a driving method thereof.

[0036]

[Means for Solving the Problems] To achieve the above object
The first means used by the present invention is to provide a plurality of data lines and
The number of scan lines and the intersections of the data lines and scan lines.
Liquid crystal pixel and two terminals provided corresponding to the liquid crystal pixel
Type switching element and before applying to the scanning line
In response to the scanning signal and the data signal applied to the data line.
In liquid crystal display devices that drive liquid crystal pixels at the same time,
Each of the scan signals applied to the scan lines is
Each has its own selection period, its own correction period, and other
The selection period of the scan signal applied to the scan line and the supplement
The current application period of constant polarity across the positive period and
It is characterized by having. Books to achieve the above objectives
The second means used by the invention is the above-mentioned device in the first means.
The data signal applied to the data line is before the scan signal.
During the selection period, the potential based on the display information of the liquid crystal pixel is changed.
In the correction period of the scanning signal, in the selection period
Characterized by having a potential for canceling the applied data potential
To do. A third method used by the present invention to achieve the above object
Means for marking each scan line in the first means.
Each of the scanning signals to be applied is unique to each of the selection signals.
Selection period, the unique correction period, and the selection voltage of the selection period.
The current application period of a current application potential having a polarity opposite to that of the
Of the current application potential of the same polarity as the selection potential of the selection period
The current application period, and the current application period is
The selection period of the scan signal applied to the scan line and the supplement
It is characterized by straddling the positive period. Reach the above objective
The fourth means used by the present invention to
At each of the scanning lines applied to each of the above
Each scanning signal has its own selection period and the selection period.
And a unique correction period approximately equal to the time interval between,
Of the data signal applied during the selection period and the correction period.
The average value is almost constant regardless of the display contents of the liquid crystal pixels.
It is characterized by In order to achieve the above object, the present invention
The fifth means used by
Each of the scan signals applied to the scan lines is individually
And the time range of the selection period
And the current application period having an equal and unique correction period.
The average value of the data signal applied to the
It is characterized by being almost constant regardless of the contents shown. the above
The sixth means used by the present invention to achieve the purpose of
Applied to each said scan line in one means
Each of the scanning signals is alternately repeated.
Period, the negative selection period, the correction period, and the positive polarity
Negative polarity current application period prior to the negative polarity selection period
And the positive polarity current mark prior to the negative polarity selection period.
And an additional period, and the current application period is applied to the other scanning line.
The selection period and the correction period of the scanning signal to be applied
It is characterized in that it is a structure that spans. For the above purpose
The seventh means used by the invention to achieve is the sixth means.
At each before applying to each said scan line at
The scanning signal has a positive polarity and is alternately repeated at a constant cycle.
The selection period, the negative selection period, and the correction period
A positive polarity of the scanning signal in the selection period.
The selection potential of the positive polarity before the selection period of the negative polarity
Equal to the positive current application potential during the current application period
The negative selection potential is positive during the negative selection period.
Of the negative polarity current application period prior to the negative polarity current selection period.
It is characterized in that it is equal to the negative current applied potential.
Eighth means used by the present invention to achieve the above object
Is applied to each of the scanning lines in the sixth means.
Each of the scanning signals is alternately repeated at a constant cycle.
The selection period of positive polarity and the selection period of negative polarity,
The correction period and the negative polarity prior to the selection period of the positive polarity
Prior to the current application period and the negative current application period.
The positive current application period and the negative selection period
Prior to the current application period of the positive polarity, and the positive polarity of the
The current application period of negative polarity prior to the current application period
However, each of the current application periods is marked on the other scan line.
In the selection period and the correction period of the scanning signal to be added
It is characterized by having a straddling structure. Reach the above objective
The ninth means used by the present invention to achieve the above is the seventh means.
And each scan line applied to each scan line.
The above-mentioned selection of positive polarity in which the check signal is alternately repeated at a constant cycle.
Period, the negative selection period, the correction period, and the positive polarity
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
Application period and selection of negative polarity Positive polarity prior to the selection period
Prior to the current application period and the positive current application period
And a current application period of negative polarity.
The current application period is for the scanning signal applied to the other scanning line.
The configuration spans the selection period and the correction period,
The positive selection of the positive polarity of the scanning signal in the selection period.
The selection potential is the positive current applying period prior to the selection period.
The selection of the negative polarity is the same as the positive current applied potential between
The negative selection potential in the period precedes the selection period.
Equal to the negative current application potential during the negative current application period
It is characterized by what is new.

The present invention is used to achieve the above objects.
The liquid crystal display driving method of the tenth means is
Data lines, multiple scan lines, and the intersection of data lines and scan lines.
Corresponding to the liquid crystal pixel provided corresponding to the point and the liquid crystal pixel
And a two-terminal switching element provided as
Scan signal applied to the line and data applied to the data line
In liquid crystal display devices that drive liquid crystal pixels in response to signals
Each has its own selection period, its own correction period, and
And the selection period of the scanning signal applied to the scanning line of
A current application period of constant polarity over the correction period, and
Is applied to each of the scan lines.
A method of driving a liquid crystal display device, comprising: Up
Eleventh means used by the present invention to achieve the above object
Is applied to each of the scanning lines in the tenth means.
The scanning signal to
And a correction period, in the selection period of the scanning signal,
Taking the data potential based on the display information of the liquid crystal pixel,
The scanning signal is applied in the selection period in the correction period.
The data signal having a data potential that cancels the data potential
Is applied to each of the data lines.
It is a method of driving a liquid crystal display device. Achieve the above objectives
The twelfth means used by the present invention for the purpose is the tenth means.
And the scanning signal has a polarity opposite to the selection potential in the selection period.
Of the current application potential of the current application potential of the
The current application period of the current application potential of the same polarity as the selection potential and
And the current application period is before application to the other scanning line.
Straddling the selection period and the correction period of the scanning signal
Applying the scan signal to each scan line
A method of driving a characteristic liquid crystal display device. Purpose of the above
The thirteenth means used by the present invention to achieve the
Applying to each of the scanning lines in
Each of the scan signals has a unique selection period and
The correction period is approximately equal to the time width of the selection period.
Then, the average value of the potentials applied during the selection period and the correction period
Is substantially constant regardless of the display content of the liquid crystal pixel
A data signal is applied to the data line.
Is a method for driving the liquid crystal display device. Achieve the above objectives
The fourteenth means used by the present invention to
At each of the scanning lines applied to each of the above
Each scanning signal has its own selection period and the selection period.
And a unique correction period approximately equal to the time interval between,
The average value of the data signal applied during the current application period is
It is almost constant regardless of the display contents of the liquid crystal pixels.
A method of driving a characteristic liquid crystal display device. Purpose of the above
The fifteenth means used by the present invention to achieve the
Applying to each of the scanning lines in
The scanning signals have positive polarity that alternates at regular intervals.
The selection period and the negative selection period, and the correction period
And the negative polarity current prior to the positive polarity selection period.
Before the application period and the positive polarity prior to the selection period of the negative polarity
A liquid crystal display device characterized by having a current application period
It is a driving method of the device. In order to achieve the above object, the present invention
The sixteenth means used by the
The positive selection potential during the selection period of the positive polarity of the check signal is
The current application period of the positive polarity prior to the selection period of the negative polarity
The selection of the negative polarity is the same as the positive current applied potential between
The negative selection potential in the period is the positive selection period
Of negative current during the negative current application period prior to
The scanning signal equal to the electric potential is applied to each scanning line.
A method of driving a liquid crystal display device, characterized in that
It The seventeenth invention used by the present invention to achieve the above object
Means for each said scan line in the fifteenth means
Each of the scanning signals to be applied has the positive selection period.
The current application period of the negative polarity prior to the
The positive current applying period prior to the current applying period, and the negative
The current application period of positive polarity prior to the selection period of polarity
And the negative polarity of the current prior to the positive current application period.
And a flow applying period.
This is a method of driving the mounted liquid crystal display device. Achieve the above objectives
The eighteenth means used by the present invention to
At each before applying to each said scan line at
The scan signal is a positive polarity signal that alternates at regular intervals.
The selection period, the selection period of negative polarity, and the selection period of positive polarity.
And the negative polarity current application period prior to the selection period.
The positive current applying period prior to the current applying period
And the positive polarity current mark prior to the negative polarity selection period.
And the negative polarity prior to the current application period of the positive polarity.
The current application period and the selection of the positive polarity of the scanning signal.
The positive selection potential in the selection period is the positive electrode prior to the selection period.
Positive current applied potential during the current application period of
In the negative polarity selection period, the negative polarity selection potential is
Negative polarity of the current application period of negative polarity prior to the selection period
The scanning signal equal to the current applied potential of
Driving a liquid crystal display device characterized by applying to a scanning line
Is the way.

[0038]

[0039]

[0040]

[0041]

[0042]

[0043]

[0044]

[0045]

[0046]

According to the present invention, the scanning signal has a unique selection period, a unique correction period, and a selection period spanning the selection period and the correction period of another scanning signal applied to another scanning line prior to the selection period. It has a longer current application period that takes a longer potential of a constant polarity.

In this way, the selection period and the correction period are introduced,
Crosstalk can be improved by taking the potential based on the display information of the liquid crystal pixel as the data signal in the selection period and using the data potential in the correction period to cancel the data potential in the selection period.

By using the selection period of another scanning signal and the correction period as the current application period of constant polarity, and by using the data signals that cancel each other out in both periods, the current flowing during each current application period is displayed. The image sticking 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 a current application period having a polarity opposite to the selection period but also a current application period having the same polarity, a large current having a reverse polarity is always applied, and a large image sticking improving effect can be obtained.

In the configuration of the liquid crystal display device of the present invention, a sufficient current flows when a current application period having the same polarity as the selection period is provided, and a sufficient current flows because the subsequent reverse polarity current application period is also reversely charged. Can flow.

By making the polarity of the current application period the same as the polarity of other selection periods that the current application period straddles, a variable power supply or a swing power supply can be adopted, and the voltage of the drive circuit can be reduced.

[0052]

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 on the n-th and n + 1-th rows, respectively. Has a unique scan period.

For example, the scanning signal φ (n) has a first scanning period T1 (n) and a second scanning period T2 (n), and the scanning signal φ (n + 1) has a first scanning period T1 (n + 1). ) And a second scanning period T2 (n + 1), each scanning period including a selection period and a correction period.

For example, the first scanning period T1 (n) of the scanning signal φ (n) has the first selection period Ts1 (n) and the first correction period Tc1 (n), and the scanning signal φ The second scanning period T2 (n) of (n) is the second selection period Ts2.
(N) and the second correction period Tc2 (n).

Similarly, the first scanning period T1 (n + 1) of the scanning signal φ (n + 1) is the first selection period Ts.
1 (n + 1) and the first correction period Tc1 (n + 1), and the second scanning period T2 (n of the scanning signal φ (n + 1).
+1) has a second selection period Ts2 (n + 1) and a second correction period Tc2 (n + 1).

Prior to each selection period, the scanning signal has a current application period of a constant polarity that extends over a selection period and a correction period of another scanning signal applied to another scanning line.

For example, the scanning signal φ (n according to the embodiment of the present invention
+1) constitutes the first scanning period T1 (n) of the scanning signal applied to the other scanning line, specifically, the scanning signal φ (n) applied to the previous scanning line S (n). First selection period T
It has a first reverse polarity current application period Ti1A (n + 1) that straddles s1 (n) and the first correction period Tc1 (n).

The scanning signal φ (n + 1) is the second selection period which constitutes the second scanning period T2 (n) of the scanning signal φ (n) applied to the previous scanning line S (n). Ts2
(N) and the second correction period Tc2 (n)
Has a reverse polarity current application period Ti2A (n + 1).

In the present invention, a plurality of current application periods may exist 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.

For example, in the embodiment of the present invention, the scanning signal φ
(N + 1) is a scanning signal applied to another scanning line, specifically, a scanning signal φ applied to the scanning line S (n-1) two lines before.
The first selection period Ts1 (n-1) and the first correction period Tc that constitute the (n-1) first scanning period T1 (n-1).
It has a first current application period Ti1B (n + 1) of the same polarity that spans 1 (n-1).

Further, the scanning signal φ (n + 1) constitutes the second scanning period T2 (n-1) of the scanning signal φ (n-1) applied to the scanning line S (n-1) two lines before. Second selection period Ts2 (n-1) and second correction period Tc2 (n-1)
The second same-polarity current application period Ti2B (n
+1).

As described above, the first reverse polarity current application period Ti1A (n + 1) and the second reverse polarity current application period T of the scanning signal φ (n + 1) applied to the scanning line S (n + 1) are applied.
i2A (n + 1) corresponds to the first scanning period T1 (n) and the second scanning period T2 (n) of the scanning signal φ (n) applied to the previous scanning line S (n). ing.

The first same polarity current application period Ti1 of the scanning signal φ (n + 1) applied to the scanning line S (n + 1) is also used.
B (n + 1) and second current application period Ti2B having the same polarity
(N + 1) is the first scanning period T1 (n− of the scanning signal φ (n−1) applied to the scanning line S (n−1) two lines before.
1) and the second scanning period T2 (n-1).

In the embodiment of the present invention, the scanning signal φ of the nth row
Comparing (n) with each of the selection period, the correction period, and the current application period, which form the scanning signal φ (n + 1) of the (n + 1) th row, the respective potentials have opposite polarities. Shows. Of course, the present invention is not limited to line-by-line inversion, but is also effective in frame inversion and inline inversion.

The data signals D (m), D '(m) and D "(m) applied to the data line in the m-th column shown in FIG. 1 are scanned from the n-2th scanning line to the nth scanning line, respectively. The liquid crystal pixels corresponding to the intersections of the line and the m-th data line 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. In the scanning signal correction period, the potential is set to cancel the data potential applied in the selection period.

The data signal D (m) for turning on the pixel is the first selection potential Vs1 because the pixel on the n-th row is turned on during the first selection period Ts1 (n) of the scanning signal φ (n). And a second data potential Vd2 having the opposite polarity to that of the corresponding first selection period Ts1 in the first correction period Tc1 (n).
The first data potential Vd1 that cancels the second data potential Vd2 of (n) is taken.

On the other hand, in the second selection period Ts2 (n) of the scanning signal φ (n), the first data potential Vd1 having the opposite polarity to the second selection potential Vs2 is taken and the second correction period Tc2 is taken.
In (n), the second data potential Vd that cancels the first data potential Vd1 in the corresponding second selection period Ts2 (n).
I'm taking 2.

Therefore, the data signal for turning on the pixel takes a data potential having a polarity opposite to the selection potential in each selection period of each scanning signal and a data potential having the same polarity as the selection potential in the correction period. Since the pixels in the (n-2) th row and the pixels in the (n-1) th row are also turned on, the data signal D (m) has such a potential even in each selection period or correction period.

Further, the data signal D '(m) for displaying a halftone in the pixel is the first selection period Ts of the scanning signal φ (n).
At 1 (n), since the pixel on the n-th row becomes halftone, the second data potential Vd2 having the opposite polarity to the first selection potential Vs1.
The ratio of the pulse width of the first data potential Vd1 having the same polarity as that of the pulse width is adjusted according to the halftone reproduction characteristic of the liquid crystal display device.

Further, the data signal D '(m) for displaying a halftone in the pixel is the second data potential V in the corresponding first selection period Ts1 (n) in the first correction period Tc1 (n).
The ratio of the pulse widths of the first data potential Vd1 and the second data potential Vd2 is adjusted so as to cancel the ratio of d2 and the first data potential Vd1.

Similarly, in the second selection period Ts2 (n) of the scanning signal φ (n), the second data potential Vd2 and the first data potential Vd1 are changed according to the halftone reproduction characteristic of the liquid crystal display device. The ratio of the pulse width is adjusted to adjust the second correction period Tc2.
In (n), the first data potential Vd1 and the second data potential Vd1 and the second data potential Vd1 and the second data potential Vd1 in the corresponding second selection period Ts2 (n) are canceled at the ratio of the pulse widths of the first data potential Vd1 and the first data potential Vd1. The pulse width of the potential Vd2 is adjusted.

Therefore, in the data signal for displaying the pixel in the halftone, the ratio of the data potential having the same polarity as the data potential having the opposite polarity to the selection potential in each selection period of each scanning signal is determined according to the halftone reproduction characteristic. In the correction period, the ratio of the data potential having the same polarity as the selection potential and the data potential having the opposite polarity is adjusted and applied to the data line so as to cancel the data signal in the selection period. Similarly, the pixels in the (n-2) th row and the (n-1) th row are halftone, so that the data signal D '
(M) has a potential adjusted in this way during each selection period or correction period.

The data signal D ″ (m) at which the pixel is turned off is
In the first selection period Ts1 (n) of the scanning signal φ (n), n
Since the pixels in the row are turned off, the first selection potential Vs1
The first data potential Vd1 having the same polarity as that of the first selection period Ts1 in the first correction period Tc1 (n).
A second data potential Vd2 that cancels the first data potential Vd1 taken by the data signal (n) is taken.

On the other hand, in the second selection period Ts2 (n) of the scanning signal φ (n), the second data potential Vd2 having the same polarity as the second selection potential Vs2 is taken and the second correction period Tc2 is taken.
In (n), the first data potential Vd that cancels the second data potential Vd2 in the corresponding second selection period Ts2 (n).
I'm taking 1.

Therefore, the data signal for turning off the pixel takes the data potential having the same polarity as the selection potential in each selection period of each scanning signal and the data potential having the opposite polarity to the selection potential in the correction period. Since the pixels in the (n-2) th row and the (n-1) th row are also off, the data signal D ″ (m) has such a potential in each selection period or correction period.

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.

FIG. 2 shows the voltage waveforms applied to the liquid crystal pixels and the switching elements, which correspond to the ON pixel, the halftone pixel and the OFF pixel, respectively. In the ON pixel, the scanning signal φ (n)- The data signal D (m), the scanning signal φ (n) -data signal D '(m) is applied to the halftone pixel, and the scanning signal φ (n) -data signal D "(m) is applied to the off pixel.

First, the writing operation and the holding operation for the liquid crystal pixels will be described. The write operation 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.

The 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, unlike the conventional example shown in FIGS. 3 and 6, the scanning period assigned to each scanning line is not used as it is as a selection period, but is divided into a selection period and a correction period. There is.

For example, the first scanning period T1 (n) and the second scanning period T2 (n) of the scanning signal φ (n) are respectively the first selection period Ts1 (n) and the first correction period Tc1.
(N), the second selection period Ts2 (n), and the second correction period Tc2 (n).

Unlike the conventional example of FIG. 6, the embodiment of the present invention has a current application period having a longer time width than the time width of each selection period before the selection period.

For example, with respect to the time width of the first selection period Ts1 (n) and the second selection period Ts2 (n) of the scanning signal φ (n), the first current application period preceding each selection period. Ti1A (n) and second current application period Ti2A
The time width with (n) is almost doubled.

That is, in the embodiment of the present invention, the time widths of the selection period and the correction period are substantially equal to each other, and the time widths of the selection period and the correction period of other scanning lines are used as the current application period. The time width of the application period is almost 2 times the time width of the selection period.
Is doubled.

As in the embodiment of the present invention, the current application period uses the time width between the selection period and the correction period of the scanning signal of another scanning line, and the selection period and the correction period cancel each other. Since the data signal is applied, the total amount of voltage applied to the liquid crystal pixel and the switching element is substantially constant during the current application period, and does not depend on the image content of the corresponding other scanning line.

First, when the pixels in the (n−2) th row to the nth row are turned on, the voltage φ (n) −D (m) applied to the liquid crystal pixels and the switching element has the first opposite polarity. The current application period Ti1A (n) will be described as an example. Scan signal φ
In the first half of the first reverse polarity current application period Ti1A (n) of (n), the first scan period T1 of the scan signal φ (n−1) is used.
First selection period Ts1 (n-1) that constitutes (n-1)
Corresponding to. Since the pixel on the (n-1) th row is on,
The data signal D (m) takes the first data potential Vd1,
The (first current application potential Vi1A)-(first data potential Vd1) is applied to the liquid crystal pixel and the switching element.

Similarly, in the latter half of the first reverse polarity current application period Ti1A (n) of the scanning signal φ (n), the scanning signal φ
This corresponds to the first correction period Tc1 (n-1) that constitutes the (n-1) first scanning period T1 (n-1). (N-
1) Since the pixel in the row is on, the data signal D (m)
Takes the second data potential Vd2, and the liquid crystal pixel and the switching element have (first current application potential Vi1A) −
(Second data potential Vd2) is applied.

When the pixels in the (n−2) th row to the nth row are halftone, the first half of the current application period Ti1A (n) of the first reverse polarity of the scanning signal φ (n) is the scanning signal φ ( It corresponds to the first selection period Ts1 (n-1) which constitutes the first scanning period T1 (n-1) of (n-1). Since the pixel in the (n-1) th row has a halftone, the data signal D '(m) takes the second data potential Vd2 and the first data potential Vd1 at a ratio according to the halftone to obtain a liquid crystal pixel. And the switching element,
A voltage of (first current application potential Vi1A)-(second data potential Vd2 to first data potential Vd1) is applied.

Similarly, in the latter half of the first reverse polarity current application period Ti1A (n) of the scanning signal φ (n), the scanning signal φ
This corresponds to the first correction period Tc1 (n-1) that constitutes the (n-1) first scanning period T1 (n-1). (N-
1) Since the pixels of the row are halftone, the data signal D ″
(M) takes the first data potential Vd1 and the second data potential Vd2 at a rate of canceling out the data signal of the first selection period Ts1 (n-1), and the liquid crystal pixel and the switching element have ( A voltage of (first current application potential Vi1A) − (first data potential Vd1 to second data potential Vd2) is applied.

When the pixels in the (n−2) th row to the nth row are off, the scanning signal φ is included in the first half of the first reverse polarity current application period Ti1A (n) which constitutes the scanning signal φ (n). (N-
It corresponds to the first selection period Ts1 (n-1) which constitutes the first scanning period T1 (n-1) of 1). Since the pixel in the (n-1) th row is off, the data signal D ″ (m) is
Of the data potential Vd2, and (first current application potential Vi1A) − (second data potential Vd2) is applied to the liquid crystal pixel and the switching element.

Similarly, the first to form the scanning signal φ (n)
The second half of the current application period Ti1A (n) having the opposite polarity is in the first correction period Tc1 (n-1) that constitutes the first scanning period T1 (n-1) of the scanning signal φ (n-1). Correspond.
Since the pixel in the (n-1) th row is off, the data signal D
(M) takes the second data potential Vd1, and the liquid crystal pixel and the switching element have (first current application potential Vi1
A)-(second data potential Vd1) is applied.

As described above, the signals applied to the liquid crystal pixels on the n-th row and the switching elements have the first reverse polarity regardless of whether the pixel on the (n-1) -th row is on, halftone, or off. In the entire current application period Ti1A (n), since data signals that cancel each other in the half and the latter half are applied, it is possible to provide a current application period that does not depend on the display contents (on, halftone, off) of the adjacent pixels. it can.

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.

Therefore, it is understood that the voltage applied to the liquid crystal pixel and the switching element during the current application period does not depend on the display content of the adjacent pixel.

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, the scanning period is further divided into the selection period and the correction period, and by applying the data signals that cancel each other, the average voltage value in each scanning period is always constant, It also solves the image-dependent crosstalk problem.

In the embodiment of the present invention, the scanning period is the selection period,
The correction period is divided in this order, but the reverse is also possible. In that case, the potential of the scanning signal in the correction period is set to, for example, the first holding potential Vh1. If the correction period is placed before the selection period, the charging characteristic matches with the charging polarity of the selection period, so that the charging characteristic is improved.

Further, in the embodiment of the present invention, two current application periods are provided for each selection period. That is, prior to the selection period, a reverse polarity current application period and a positive polarity current application period are provided.

When a current application period of reverse polarity is provided prior to the selection period as in the conventional example shown in FIG. 6, the polarity is the same as that of the previous selection period, so that it is difficult for sufficient current to flow. However, when the current application period having the same polarity as that of the selection period is provided as in the embodiment of the present invention, a sufficient current flows, and the subsequent current application period of the opposite polarity also causes reverse charging, so that a sufficient current can flow. Therefore, it is simply more than twice as effective as the single case.

As in the present invention, when the current flowing in each current application period is almost constant irrespective of the displayed contents, the current application period can be extended without causing side effects, and the current application period is not limited to two. More than one is possible.

In the embodiment of the present invention, the selection period and the current application period preceding the selection period are respectively continuous,
A period during which a current does not flow so much may be provided during that period. 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), D "applied to the data line in the m-th column.
As in the conventional example of FIG. 4, (m) has a potential between the first data potential Vd1 and the second data potential Vd2 as in the conventional example of FIG.

Further, the gradation display is performed by either amplitude modulation or pulse width modulation, and the latter example is shown in FIG. 1, but of course amplitude modulation may 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 FIG. 1, scanning signals φ (n), φ
(N + 1), data signals D (m), D '(m), D "
Although (m) is described with reference to the reference potential indicated by the alternate long and short dash line, it may vary throughout the system.

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

As is apparent from the embodiment of the present invention shown in FIG. 1, the polarities of the selection potential, the correction potential, and the current application potential which constitute the scanning period of each scanning signal within one scanning period are always constant. I am trying.

For example, in the first scanning period T1 (n-2) of the scanning signal φ (n-2), the first scanning period T1 (n-
2) the first positive selection potential V1s in the first selection period Ts1 (n−2) and the first correction period Tc1 (n−).
The positive first holding potential Vh1 in 2) is output.

Similarly, the first of the scanning signal φ (n-2)
Of the scanning signal φ (n-1) in the scanning period T1 (n-2) of
Positive current application potential Vi2A in the first opposite polarity current application period Ti1A (n-1) and positive current application potential Ti1B (n) in the first same polarity current application period Ti1B (n) of the scan signal φ (n). It outputs the potential Vi1B.

For the other scanning signals, the positive first holding potential Vh1 and the negative second holding potential Vh2 are output.

Therefore, the first scan signal φ (n−2)
In the scanning period T1 (n−2), the current application potentials Vi1A, Vi2B and the second selection potential Vs2, which are the negative potentials of the high voltage, do not exist other than the negative second holding potential Vh2 of the low voltage. .

Therefore, in the scanning period T1 (n-2), the voltage of the driver IC is set to the low second negative holding potential Vh2.
It is possible to limit the above. Similarly, the scanning period T1
(N), T1 (n + 2) ... And the scanning period T2 (n-
1), T2 (n + 1), ..., No large negative voltage exists, and conversely, scanning periods T1 (n-1), T1 (n + 1) ...
.. and scanning periods T2 (n-2), T2 (n), T2 (n +
2) There is no large positive voltage.

From the above, it becomes possible to use a low withstand voltage driver IC by changing the entire reference potential.
Further, for the same reason, it is possible in the present invention to change the power source itself of the driver IC.

In the embodiment of the present invention, the first same-polarity current application potential Vi1B in the first same-polarity current application period Ti1B (n) of the scanning signal φ (n) and the first selection period Ts1. The selection potential Vs1 in (n) and the second reverse polarity current application potential Vi2A in the second reverse polarity current application period Ti2A (n) are described as the same potential.

The second current application period Ti2 of the same polarity is applied.
Second current applying potential Vi2B of the same polarity in B (n)
And the selection potential V in the second selection period Ts2 (n)
s2 and the first reverse polarity current application potential Vi2A in the first reverse polarity current application period Ti1A (n) are described as the same potential.

In the present invention, it is not always necessary to use these potentials in common, but the above potentials can be shared because they fully function at the same potential, in which case the number of power supplies in the circuit can be saved. So there are great benefits.

In the embodiment of the present invention, the time width of the selection period and the time width of the correction period in the scanning signal are set equal. But it doesn't have to be exactly equal,
Considering the crosstalk and the display content dependence within the current application period, the same case corresponds to the optimum condition. like this
In the detailed description of the present invention, the following configurations are described.
There is. Multiple data lines, multiple scan lines, and data lines
Liquid crystal pixels provided corresponding to the intersections with the scanning lines, and liquid crystal pixels
And a two-terminal switching element provided corresponding to
Scan signal applied to scan line and data applied to data line
In liquid crystal display devices that drive liquid crystal pixels in response to signals
Therefore, each scan signal applied to each scan line has its own selection period.
And at least one current application period that is longer than the selection period
And another scan line that is applied to another scan line during the current application period.
A liquid crystal display device configured to extend over a selection period of a check signal.
Also, a plurality of data lines, a plurality of scanning lines, and a data line
Liquid crystal pixels provided corresponding to the intersections with the scanning lines, and liquid crystal pixels
And a two-terminal switching element provided corresponding to
Scan signal applied to scan line and data applied to data line
In liquid crystal display devices that drive liquid crystal pixels in response to signals
Each scan signal applied to each scan line is uniquely selected.
Selection period, unique correction period, and scanning applied to other scan lines.
Of constant polarity over the selection period and correction period of the check signal
A liquid crystal display device characterized by having a current application period
Place Also, multiple data lines, multiple scan lines, and data
A liquid crystal pixel provided corresponding to the intersection of the scanning line and the scanning line,
With a two-terminal switching element provided corresponding to the pixel
The scan signal applied to the scan line and the data signal applied to the data line.
Liquid crystal display device that drives liquid crystal pixels according to the data signal
Each scan signal applied to each scan line is unique
Selection period, unique correction period, and application to other scan lines.
A fixed pole that spans the scanning signal selection period and the correction period.
Data application period and the data to be applied to the data line
The signal indicates the display information of the liquid crystal pixel during the scanning signal selection period.
The potential based on the
It has a potential to cancel the data potential applied between
Liquid crystal display device. In addition, multiple data lines and multiple
Provided corresponding to the intersection of the scanning line and the data line and scanning line
Liquid crystal pixel and a 2-terminal type switch provided corresponding to the liquid crystal pixel.
The scanning signal applied to the scanning line and the
Driving liquid crystal pixels according to the data signal applied to the data line
In the liquid crystal display device, each scan applied to each scan line
Each signal has its own selection period, its own correction period,
A current mark of a current application potential having a polarity opposite to that of the selection potential in the selection period
Applied period and a current application voltage of the same polarity as the selected potential of the selected period.
And a current application period of about
Straddling the selection period of the scanning signal applied to the line and the correction period.
A liquid crystal display device characterized by the following. Also, multiple data
Line, multiple scan lines, and the intersection of the data and scan lines.
A liquid crystal pixel provided correspondingly, and a liquid crystal pixel provided corresponding to the liquid crystal pixel 2
It has a terminal type switching element,
LCD depending on the inspection signal and the data signal applied to the data line
Applied to each scanning line in a liquid crystal display device that drives pixels
Each scanning signal to be used has its own selection period and selection period.
The other correction line has a unique correction period that is almost equal to the time width of
One that spans the selection period and the correction period of the scanning signal to be applied.
Has a constant polarity current application period, the selection period and the correction period
The average value of the data signal applied between
Liquid crystal display device characterized by being almost constant regardless of content
Place Also, multiple data lines, multiple scan lines, and data
A liquid crystal pixel provided corresponding to the intersection of the scanning line and the scanning line,
With a two-terminal switching element provided corresponding to the pixel
The scan signal applied to the scan line and the data signal applied to the data line.
Liquid crystal display device that drives liquid crystal pixels according to the data signal
Each scan signal applied to each scan line is unique
Selection period and a unique supplement that is approximately equal to the duration of the selection period.
Positive period and selection period of scanning signal to be applied to other scanning lines
There is a current application period of constant polarity that spans the correction period.
However, the average value of the data signal applied during the current application period is the liquid crystal
The feature is that it is almost constant regardless of the display contents of pixels.
Liquid crystal display device. Also, multiple data lines and multiple scans
Liquid crystals and lines, Ru provided corresponding to intersections of data lines and scan lines
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 the crystal display device, each scanning signal applied to each scanning line is
Alternating positive polarity selection period and negative polarity selection period
And the correction period and the negative polarity voltage prior to the positive polarity selection period.
Current and positive current prior to negative selection period
The application period and the current application period are applied to other scanning lines.
The scanning signal selection period and the correction period
A liquid crystal display device characterized by the following. Also, multiple data
Line, multiple scan lines, and the intersection of the data and scan lines.
A liquid crystal pixel provided correspondingly, and a liquid crystal pixel provided corresponding to the liquid crystal pixel 2
It has a terminal type switching element,
LCD depending on the inspection signal and the data signal applied to the data line
Applied to each scanning line in a liquid crystal display device that drives pixels
Each scanning signal that has a positive polarity
Select period, negative selection period, correction period, and positive polarity
Selection of negative polarity current application period and negative polarity prior to selection period
Positive current application period prior to the period
The period is the selection period of the scanning signal applied to other scanning lines and the correction
The scan signal has a positive polarity selection period.
The positive selection potential in between is positive before the negative selection period.
Equal to the positive polarity current application potential during the polarity current application period,
The negative selection potential during the negative selection period is the positive selection
Current of negative polarity prior to selection period Current of negative polarity during application period
A liquid crystal display device characterized by being equal to an applied potential. Well
In addition, multiple data lines, multiple scan lines, data lines and
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
The scanning signals applied to each scanning line are alternated at a constant cycle.
Repeat the positive selection period and negative selection period
Positive period and negative current application prior to positive selection period
Period and the positive polarity current prior to the negative polarity current application period
A positive polarity current mark prior to the application period and the negative polarity selection period.
And a negative polarity current before the positive polarity current application period.
Current application period, and each current application period is marked on another scan line.
Configuration that spans the selection period and the correction period of the applied scanning signal
And a liquid crystal display device. Also, multiple data
Data line, multiple scan lines, intersection of data line and scan line
Liquid crystal pixel provided corresponding to, and provided corresponding to liquid crystal pixel
And a two-terminal type switching element that is applied to the scanning line
Depending on the scanning signal and the data signal applied to the data line.
In a liquid crystal display device that drives liquid crystal pixels,
Each scanning signal to be applied is alternately repeated at a fixed cycle.
Polarity selection period, negative polarity selection period, correction period, and positive polarity
Negative polarity current application period prior to the negative polarity selection period and the negative polarity current application period.
Positive current application period prior to the positive current application period and negative current application period
The positive current application period prior to the polarity selection period and the positive current application period
The negative current application period prior to the polarity current application period
Scan signals to be applied to other scan lines during each current application period
Scan signal and the correction period.
The positive selection potential in the positive selection period of the
Current application potential of positive polarity during positive current application period prior to
Equal to the negative selection potential during the negative selection period
Is the negative polarity of the negative current application period prior to the selection period.
A liquid crystal display device characterized by being equal to a current applied potential.
Also, a plurality of data lines, a plurality of scanning lines, and a data line
Liquid crystal pixels provided corresponding to the intersections with the scanning lines, and liquid crystal pixels
And a two-terminal switching element provided corresponding to
Scan signal applied to scan line and data applied to data line
In liquid crystal display devices that drive liquid crystal pixels in response to signals
Each unique selection period and other
The number of scan signals that are applied to the scan line may not exceed the selection period.
A scanning signal having at least one current application period
A driving method of a liquid crystal display device, which is applied to each scanning line. Well
In addition, multiple data lines, multiple scan lines, data lines and
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
Each has its own selection period, its own correction period, and
Between the selection period and the correction period of the scanning signal applied to the scanning line of
Scanning signal and a constant current application period of the polarity across
Is applied to each scanning line.
Method of driving the display device. Also, multiple data lines and multiple runs
Liquid to be provided corresponding to the intersection of the inspection line and the data line and scanning line
Crystal terminals and two-terminal switch provided for liquid crystal pixels
Scanning signal and data to be applied to the scanning line
Driving liquid crystal pixels according to the data signal applied to the line
In liquid crystal display devices, each has a unique selection period and
Positive period and selection period of scanning signal to be applied to other scanning lines
There is a current application period of constant polarity that spans the correction period.
Scan signal is applied to each scan line and the scan signal selection period
The data potential based on the display information of the liquid crystal pixels
In the correction period of the check signal, the data voltage applied in the selection period is
Each data line with a data signal having a data potential that cancels
A method for driving a liquid crystal display device, characterized in that the voltage is applied to the liquid crystal display device.
Also, a plurality of data lines, a plurality of scanning lines, and a data line
Liquid crystal pixels provided corresponding to the intersections with the scanning lines, and liquid crystal pixels
And a two-terminal switching element provided corresponding to
Scan signal applied to scan line and data applied to data line
In liquid crystal display devices that drive liquid crystal pixels in response to signals
, A unique selection period, a unique correction period, and
Application of current of opposite polarity to selected potential during selected period
Period and current application potential of the same polarity as the selection potential of the selection period
Current application period of the other scanning line
Spans the selection period and the correction period of the scanning signal applied to
Characterized in that a scanning signal is applied to each scanning line
Driving method for liquid crystal display device. Also, with multiple 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 to be driven, each applied to each scanning line
Each scanning signal has its own selection period and time of the selection period.
Correction period that is almost equal to the width, and scanning applied to other scanning lines
There is a constant polarity voltage across the signal selection period and the correction period.
And applying a scanning signal having a current application period to each scanning line,
The average value of the potential applied during the selection period and the correction period is the liquid crystal image.
Data signals that are almost constant regardless of the content
Driving method of liquid crystal display device characterized by applying to
Law. Also, multiple data lines, multiple scan lines, and data
A liquid crystal pixel provided corresponding to the intersection of the scanning line and the scanning line,
With a two-terminal switching element provided corresponding to the pixel
The scan signal applied to the scan line and the data signal applied to the data line.
Liquid crystal display device that drives liquid crystal pixels according to the data signal
Each scan signal applied to each scan line is unique
The selection period and the correction period that is almost equal to the time width of the selection period
And the selection period and correction period of the scanning signal applied to other scanning lines.
With a constant current application period of constant polarity
A scanning signal is applied to each scanning line, and the selection period and the correction period are
The average value of the applied potential depends on the display content of the liquid crystal pixel.
The feature is that a substantially constant data signal is applied to the data line.
A method of driving a liquid crystal display device. Also, multiple data
Line, multiple scan lines, and the intersection of the data and scan lines.
A liquid crystal pixel provided correspondingly, and a liquid crystal pixel provided corresponding to the liquid crystal pixel 2
It has a terminal type switching element,
LCD depending on the inspection signal and the data signal applied to the data line
Applied to each scanning line in a liquid crystal display device that drives pixels
Each scanning signal that has a positive polarity
Select period, negative selection period, correction period, and positive polarity
The negative polarity current application period prior to the selection period and the negative polarity selection period are selected.
The positive current application period prior to the selection period.
The additional period is complementary to the selection period of the scan signal applied to other scan lines.
A scan signal that spans the positive period is printed on each scan line.
A method of driving a liquid crystal display device, comprising: Well
In addition, multiple data lines, multiple scan lines, data lines and
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
The scanning signals applied to each scanning line are alternated at a constant cycle.
Repeat the positive selection period and negative selection period
Positive period and negative current application prior to positive selection period
Period and positive polarity current application period prior to negative polarity selection period
And a scanning signal applied to another scanning line during the current application period.
The scan signal is configured to extend over the signal selection period and correction period.
The positive selection potential during the positive polarity selection period of
Positive polarity current before the selection period Positive polarity current during the application period
Equal to the applied potential, and the negative polarity during the negative polarity selection period
Selective potential is negative current applied prior to positive selection period
Each scan with a scan signal equal to the negative current applied potential in the period
Driving method of liquid crystal display device characterized by applying to line
Law. Also, multiple data lines, multiple scan lines, and data
A liquid crystal pixel provided corresponding to the intersection of the scanning line and the scanning line,
With a two-terminal switching element provided corresponding to the pixel
The scan signal applied to the scan line and the data signal applied to the data line.
Liquid crystal display device that drives liquid crystal pixels according to the data signal
In addition, each scanning signal applied to each scanning line has a constant cycle.
Alternating positive polarity selection period and negative polarity selection period
And the correction period and the negative polarity voltage prior to the positive polarity selection period.
Current application period and positive polarity prior to the negative current application period
Current application period and positive polarity prior to the negative polarity selection period.
Current application period and negative electrode prior to the positive current application period
Current application period, and each current application period is another scan
Straddling the selection period of the scanning signal applied to the line and the correction period.
The feature is that the scanning signal with the configuration is applied to each scanning line.
And a method for driving a liquid crystal display device. Also, multiple data lines
And multiple scan lines and the intersection of data lines and scan lines
Liquid crystal pixel provided separately and two ends provided corresponding to the liquid crystal pixel
Scanning having a child switching element and applied to a scanning line
Depending on the signal and the data signal applied to the data line,
In a liquid crystal display device that drives pixels, it is applied to each scanning line.
Each scanning signal that has a positive polarity is alternately repeated at regular intervals.
Selection period, negative polarity selection period, correction period, and positive polarity selection period.
And the negative polarity current application period prior to the selection period.
Current application period prior to the current application period and negative polarity current application period
A positive current applying period prior to the selection period and the positive current applying period
And a negative current application period prior to the current application period,
Selection of scan signal to be applied to other scan lines during each current application period
It is configured to extend over the period and the correction period, and the positive polarity of the scanning signal
The positive selection potential during the sex selection period precedes the selection period.
Equal to the positive current applied potential during the positive current application period.
The negative selection potential during the negative selection period is
Negative current mark during negative current application period prior to selection period
The feature is that a scanning signal equal to the applied potential is applied to each scanning line.
A method of driving a liquid crystal display device.

[0122]

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 dependence of the amount of current during the current application period. Crosstalk is likely to occur due to the dependency.

In the present invention, the voltage applied to the liquid crystal pixel and the switching element during the current application period does not depend on the display content of the pixel. As a result, almost the same current always flows in the switching element, and it is possible to reduce the image sticking.

Further, in the present invention, the crosstalk problem is solved at the same time by further dividing the scanning period into the selection period and the correction period and applying the data signals that cancel each other. That is, in the data signal of the present invention, the average value for each scanning period is always constant, and image-dependent crosstalk can be avoided.

Further, according to the present invention, the variable power source method and the IC power source swing method are possible while obtaining the above effects.

[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 T1 (n) when pixel is off First scanning period T2 (n) of scanning signal of nth row Second scanning period T1 (n + 1) of scanning signal of nth row Scanning of n + 1th row Signal first scanning period T2 (n + 1) n + 1-th row scanning signal second scanning period Ts1 (n) First selection period Ts2 (n) Second selection period Tc1 (n) First correction period Tc2 (n) Second correction period Ti1A (n) First reverse polarity current application period Ti2A (n) Second reverse polarity current application period Ti1B (n) First same polarity current application period Ti2B ( n) Second same-polarity current application period Vs1 First selection potential Vs2 Second selection voltage Vi1A 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 (18)

(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,
LCD wherein comprising a two-terminal type switching elements provided corresponding to the liquid crystal pixel to drive the liquid crystal pixel in accordance with a data signal to be applied to the scanning signal and the data <br/> data lines to be applied to the scanning lines in the display device, each of the scanning signal to be applied to each of the scanning lines and each unique selection period, a unique correction period, and the selection period of the scanning signal to be applied to the other of said scanning lines
A liquid crystal display device, comprising: a current application period of a constant polarity that extends over the correction period. Wherein said data signal to be applied to the data line is applied in the selection period of the scanning signal, it takes a potential based on the display information of the liquid crystal pixels, in the correction period of the scanning signal in said selection period 2. The liquid crystal display device according to claim 1, wherein the liquid crystal display device has a potential for canceling the data potential to be applied. Wherein it is applied to each of the scan lines
Said scanning signal and each unique said selection period Les, the specific of the correction period, and the current application period of the selection potential and the opposite polarity of the current applied potential of the selection period, prior to the selection period
And a serial the current application period of the current applied potential of the selection potential with the same polarity, that said current application period spanning said correction period and the selection period of the scanning signal to be applied to the other of said scanning lines The liquid crystal display device according to claim 1, wherein the liquid crystal display device is a liquid crystal display device. 4. It is applied to each of the scan lines
Each of said scanning signal Les is a unique said selection period, before
And a substantially equal specific of the correction period and the duration of the serial selection period, the average value of the data <br/> data signal applied to the said selection period and the correction period is independent of the display content of the liquid crystal pixel The liquid crystal display device according to claim 1, wherein the liquid crystal display device is substantially constant. 5. It is applied to each of the scan lines
Each of said scanning signal Les is a unique said selection period, before
Has a time width of serial selection period and the substantially equal specific of the correction period, the average value of the data signal to be applied to the current application period and characterized by a substantially constant regardless of the display contents of the liquid crystal pixel The liquid crystal display device according to claim 1 . 6. It is applied to each of the scan lines
And the scanning signal is the selection period of the negative and positive polarity the selection period of the alternating Les, and the correction period, and the current application period of a negative polarity prior to the selection period of the positive polarity,
And a said current application period of the positive polarity prior to the negative polarity the selection period of the current application period is a structure spanning said correction period and the selection period of the scanning signal to be applied to the other of said scanning lines The liquid crystal display device according to claim 1, wherein the liquid crystal display device is a liquid crystal display device. 7. It is applied to each of the scan lines
The scanning signal Les are said selection period of the selection period and a negative polarity positive polarity alternately in a constant cycle, and a the correction period, in the positive to the selection period of the positive polarity of the scanning signal the selection of the selection potential is equal to the positive polarity of the current applied potential of the current application period of the positive polarity prior to the selection period of the negative polarity, the selection potential of the negative polarity in the selection period of negative polarity positive polarity the liquid crystal display device according to claim 6, characterized in that equal to negative the current applied potential of the current application period of a negative polarity prior to period. Wherein said Resona applied to each of the scan lines
Said selection period of negative polarity and positive polarity the selection period of the alternating scanning signal, respectively at a constant period Re, and the correction period, and the current application period of a negative polarity prior to the selection period of the positive polarity , a positive polarity the current application period prior to the current application period of negative polarity, positive polarity the current application period prior to the selection period of the negative polarity, the negative polarity prior to the current application period of the positive polarity Has a current application period and it
The current application period of, respectively before applying the other of said scanning lines
The liquid crystal display device according to claim 6, wherein the serial is the selection period and spanning said correction period configuration of the scanning signal. 9. It is applied to each of the scan lines
And the scanning signal is the selection period of the negative polarity and the selection period of the positive polarity alternately in a constant cycle of les, and the correction period, and the current application period of a negative polarity prior to the selection period of the positive polarity, and wherein the current application period of the positive polarity prior to the current application period of the negative polarity, and the current application period of the positive polarity prior to the selection period of negative polarity, a negative polarity prior to the current application period of positive polarity the current Has an application period and it
The current application period of, respectively before applying the other of said scanning lines
Serial and the selection period of the scanning signal and configured spanning said correction period, the selection electric potential of the positive in the selection period of the positive polarity of the scanning signal prior to the positive polarity prior to the selection period
Equal to the positive polarity of the current applied potential of the serial current application period, the selection electric potential of in the selection period, a negative of the negative polarity is equal to the negative polarity of the current applied potential of the current application period of a negative polarity prior to the selection period The liquid crystal display device according to claim 7, wherein the liquid crystal display device is a liquid crystal display device. 10. A plurality of data lines, a plurality of scanning lines,
A liquid crystal pixels provided to correspond to the intersection of the data lines and scan lines, has a 2 and the terminal type switching elements provided corresponding to the liquid crystal pixel, the scan signal and the <br/> data to be applied to the scanning lines in the liquid crystal display device for driving a liquid crystal pixel in accordance with a data signal applied to the line, a unique selection period, respectively, a unique correction period, before other
And wherein applying the scan signal and a constant current application period of polarity spanning said selection period and the <br/> correction period of the scanning signal to be applied to the serial scan lines to each of the scan lines Driving method for liquid crystal display device. 11. The voltage applied to each scanning line
Each scan signal is a unique said selection period, and a the correction period, the selection period of the scanning signal, takes the data potential based on the display information of the liquid crystal pixels, the at the correction period of the scanning signal it the data signal having a data potential for canceling the data potential applied during the selection period
Claim, characterized in that applied to the data lines of les 1
0. A method for driving a liquid crystal display device according to item 0 . 12. The method of claim 11, wherein the scanning signal, and the current application period of the selection potential and the opposite polarity of the current applied potential of the selection period, before
And a said conductive <br/> current application period of the selection potential and the polarity of the current applied potential of serial selection period, said current application period is the said selection period of said scanning signal to be applied to the other of said scanning lines the driving method of claim 10, wherein applying the scanning signal spanning a correction period to each of the scan lines. 13. It applied to each said scan line
Each of the scanning signal, respectively and specific of said selection period,
Have a approximately equal the correction period and the duration of the selection period
And, wherein the average value of the potential applied to the said selection period and the correction period for applying the <br/> data signal is substantially constant regardless of the display contents of the liquid crystal pixel to the data line
The method for driving a liquid crystal display device according to claim 10 . 14. It for applying to each said scan line
Each of the scanning signal, respectively and specific of said selection period,
And wherein the duration of the selection period and have a substantially equal specific of the correction period, the average value of the data signal to be applied to the current application period is substantially constant regardless of the display contents of the liquid crystal pixel The method for driving a liquid crystal display device according to claim 10 . 15. That applied to each said scan line
The scanning signal, respectively the said selection period of a negative polarity and the selection period of the positive polarity alternately in a constant cycle, and the correction period, the collector of the negative polarity prior to the selection period of the positive polarity <br / > a stream application period, the positive polarity prior to the selection period of the negative polarity
2. The method according to claim 1, further comprising: the current application period.
0. A method for driving a liquid crystal display device according to item 0 . 16. 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 the current application period of the positive polarity prior to the selection period of the negative polarity, a negative polarity the selection potential of the negative polarity in the selection period its negative polarity of the scanning signal is equal to the current applied potential of negative polarity the current application period prior between positive selection the択期of
Claims, characterized in that to be applied to the scanning lines respectively
16. A method for driving a liquid crystal display device according to item 15 . 17. It applied to each said scan line
The scanning signal, respectively the said current application period of a negative polarity prior to the selection period of the positive polarity, and the current application period of the positive polarity prior to the current application period of a negative polarity, a negative polarity said election <br / > positive polarity the current application period prior between択期, positive
The driving method of claim 15, wherein a said current application period of a negative polarity prior to the current application period. 18. It applied to each said scan line
The scanning signal, respectively, the said selection period of positive polarity alternately in a constant cycle and a negative polarity said selection period, and the auxiliary <br/> positive period, a negative prior to the selection period of the positive polarity It said <br/> current application period, the positive polarity the current application period prior to the current application period of negative polarity, positive polarity the current application period prior to the selection period of the negative polarity, positive polarity wherein the and a said current application period of a negative polarity prior to current application period, the positive polarity positive selection potential in the selection period of the scanning signal of the positive polarity of the current application period of the positive polarity prior to the selection period equal to the current applied potential, the selection potential of the in the selection period, a negative of the negative polarity of the scanning signal is equal to the negative polarity of the current applied potential of the <br/> current application period of a negative polarity prior to the selection period claims and applying to each of the scan lines Method for driving a liquid crystal display device according to 16.