JP2001075073A - Method for driving liquid crystal display device with wide viewing angle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a wide viewing angle without changing the structure of a liquid crystal display device by displaying an image with synthesized viewing angle characteristics of the display having the viewing angle characteristics at a first driving voltage and the display with viewing angle characteristics at a second voltage. SOLUTION: By alternately switching a first driving voltage V1 and a second driving voltage V2 for every field, the display changes between the alignment state to give the transmittance according to the image data and the alignment state to give different viewing angle characteristics from the viewing angle characteristics by the first driving voltage V1. Therefore, the image can be displayed with synthesized viewing angle characteristics of the display having the viewing angle characteristics by the first driving voltage V1 and the display having the viewing angle characteristics by the second voltage. By this method for driving, the apparent viewing angle of the liquid crystal display device is increased by the synthesis of the viewing angle at the first driving voltage V1 applied and the viewing angle at the second driving voltage V2 applied.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for driving a liquid crystal display device at a wide viewing angle.

[0002]

2. Description of the Related Art Generally, a liquid crystal display element is provided with a liquid crystal layer in which liquid crystal molecules are twist-aligned between a pair of substrates on which electrodes forming a plurality of pixel portions are formed on surfaces facing each other. A TN (twisted nematic) type or STN (super twisted nematic) type having a configuration in which a polarizing plate is arranged on the outer surface of a substrate is used.

[0003] This type of liquid crystal display element has a drawback that its voltage-transmittance characteristic has a viewing angle dependency, and therefore the viewing angle (observation angle range in which display can be observed with good contrast) is narrow.

This is because the value of Δn · d (the product of the refractive index anisotropy Δn of the liquid crystal and the thickness d of the liquid crystal layer) of the liquid crystal display element apparently changes depending on the viewing angle (viewing direction of display).
Therefore, even if the voltage applied between the electrodes provided on the inner surfaces of the pair of substrates of the liquid crystal cell is the same, that is, even if the rising angle of the liquid crystal molecules with respect to the substrate surface is the same, the light transmittance is high. Since the voltage-transmittance characteristic of the liquid crystal display element depends on the viewing angle, it depends on the viewing angle.

The viewing angle dependence of the voltage-transmittance characteristic is determined by changing the voltage applied between the electrodes to the threshold voltage of the liquid crystal and the voltage at which the liquid crystal molecules rise and align to a state almost perpendicular to the substrate surface. This is particularly problematic when performing gradation display in which brightness is given a gradation by controlling stepwise between the above and the gradation display. In this gradation display, the brightness of the halftone display depends on the viewing angle. It changes greatly.

That is, the liquid crystal display element has a viewing angle dependency, and the contrast is good when the display is observed from a direction within the viewing angle. However, when the display is observed from a direction shifted from the direction within the viewing angle. , The contrast is remarkably reduced, and the gray scale is inverted.

Therefore, conventionally, a pixel division method has been proposed as a means for improving the viewing angle of the liquid crystal display device. The pixel division method includes a voltage control method and an alignment control method.

In the voltage control method, an electrode on one substrate of a liquid crystal display element is divided into a plurality of electrodes for each pixel portion, and drive voltages of different values are respectively applied between the divided electrodes and the electrodes on the other substrate. Is applied, the rising alignment state of the liquid crystal molecules is made different in a plurality of regions in the pixel portion, and the viewing angles of these regions are made different from each other to widen the viewing angle.

In the alignment control method, each pixel portion of the liquid crystal display element is divided into a plurality of regions, and the initial alignment state of liquid crystal molecules (alignment state in an electric field-free state) differs for each of the regions. Thus, the viewing angles of these regions are made different from each other, and the viewing angle is widened.

[0010]

However, in the above-described voltage control system, the electrode on one substrate of the liquid crystal display element must be divided into a plurality of electrodes for each pixel portion. In addition, an alignment process must be performed on the inner surface of the substrate of the liquid crystal display element in order to align liquid crystal molecules in different alignment states for each region of the pixel portion.

Therefore, the above-described pixel division method has a problem that the manufacturing cost of the liquid crystal display element is increased both when the voltage control method is used and when the alignment control method is used.

An object of the present invention is to provide a method for driving a liquid crystal display device having a wide viewing angle, which can realize a wide viewing angle without modifying the structure of the liquid crystal display device.

[0013]

According to the wide viewing angle driving method of the present invention, a liquid crystal display element is provided between electrodes of each pixel portion.
A first drive voltage for obtaining a transmittance corresponding to image data and a second drive voltage having a value different from the first drive voltage by a predetermined value are alternately applied at a predetermined time ratio. ,
A display having a viewing angle characteristic by the first drive voltage,
The display with the viewing angle characteristic combined with the display having the viewing angle characteristic by the second voltage is displayed.

That is, in this driving method, the liquid crystal molecules in each pixel portion of the liquid crystal display element are aligned in an alignment state in which a transmittance corresponding to the image data is obtained by applying the first driving voltage, and the liquid crystal molecules are determined in advance. By applying the second drive voltage different from the first drive voltage by the value obtained by applying the second drive voltage to the orientation state in which a view angle characteristic different from the view angle characteristic when the first drive voltage is applied is obtained. The viewing angle of each pixel portion is changed according to the ratio of the application time of the first drive voltage and the second drive voltage.

According to this driving method, the apparent viewing angle of the liquid crystal display element is different from the viewing angle when the first driving voltage is applied and the viewing angle when the second driving voltage is applied. Is obtained, a wide viewing angle can be realized without modifying the structure of the liquid crystal display element.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A wide viewing angle driving method according to the present invention
As described above, the first drive voltage for obtaining the transmittance according to the image data and the value different from the first drive voltage by a predetermined value are respectively provided between the electrodes of each pixel portion of the liquid crystal display element. The second driving voltage is alternately applied at a predetermined time ratio, thereby realizing a wide viewing angle without changing the structure of the liquid crystal display element.

In the wide-viewing-angle driving method according to the present invention, the second driving voltage is set to be 0.1 to 1.0 with respect to the first driving voltage.
It is preferable that the voltage has a voltage difference in the range of 5 V to 1.5 V. Thus, by selecting the second drive voltage,
An image of good quality is displayed, which is almost the same as when driving by applying a first driving voltage for always obtaining a transmittance according to image data, without causing fluctuations in display brightness and contrast. be able to.

Further, the application time of the first drive voltage,
The ratio of the second drive voltage to the application time is 1: 1 to 4: 1.
By doing so, it is almost the same as the case of driving by applying the first driving voltage for always obtaining the transmittance according to the image data without causing the display to flicker. Good quality images can be displayed.

Further, as described above, the second drive voltage is a voltage having a voltage difference in a range of 0.5 V to 1.5 V with respect to the first drive voltage, and the application time of the first drive voltage and When the ratio of the application time of the second drive voltage to the application time is set to 1: 1 to 4: 1, an image of better quality without fluctuation and flicker of brightness and contrast can be displayed.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. First, a liquid crystal display element to be driven for display will be described. FIG. 5 is a sectional view of a part of the liquid crystal display element, and FIG. 6 is an equivalent circuit plan view of one substrate of the liquid crystal display element.

The liquid crystal display element 1 is an active matrix type TN type liquid crystal display element. The liquid crystal display element 1 has a row direction on an inner surface of one of a pair of substrates 2 and 3 opposed to each other with a liquid crystal layer 12 interposed therebetween. Further, a plurality of transparent pixel electrodes 4 arranged in a matrix in the column direction are provided, and a single film-shaped transparent counter electrode 8 facing the plurality of pixel electrodes 4 is provided on the inner surface of the other substrate 3. ing.

FIG. 5 shows an inner surface of the one substrate 2.
And a plurality of TFTs (thin film transistors) 5 corresponding to the plurality of pixel electrodes 4, respectively, as shown in FIG.
Are arrayed, a plurality of gate wirings 6 for supplying gate signals to the TFTs 5 in each row, and a plurality of TFs in each column.
A plurality of data wirings 7 for supplying a data signal to T5
Are provided, and each of the plurality of pixel electrodes 4 is connected to a TFT 5 corresponding to the pixel electrode 4.

Although FIG. 5 shows the TFT 5 in a simplified manner, the TFT 5 has a gate electrode formed on the substrate 2 and a transparent electrode formed on almost the entire surface of the substrate 2 so as to cover the gate electrode. A gate insulating film, an i-type semiconductor film provided on the gate insulating film so as to face the gate electrode, and a source formed on both sides of the i-type semiconductor film via an n-type semiconductor film The pixel electrode 4 is formed on the gate insulating film, and is connected to the corresponding source electrode of the TFT 5.

The gate wiring 6 is formed on the substrate 2 and is connected to the gate electrode of the TFT 5.
The gate wiring 6 is covered with the gate insulating film except for the terminal portion 6a.

On the other hand, the data wiring 7 is formed on the gate insulating film and is connected to the drain electrode of the TFT 5. The data wiring 7 is covered with a transparent protective insulating film except for the terminal portion 7a.

In the liquid crystal display device 1, a plurality of pixel electrodes 4 arranged on the inner surface of the one substrate 2 and a plurality of opposing electrodes 8 formed on the inner surface of the other substrate 3 face each other. Red, green, and blue corresponding to the pixel portions of
A full-color image display device having color filters 9R, 9G, 9B;
G and 9B are formed on the other substrate 3 surface, and the counter electrode 8 is provided thereon.

Further, alignment films 10 and 11 are provided on the inner surfaces of the pair of substrates 2 and 3 so as to cover the electrodes 4 and 8, respectively. Is rubbed in a predetermined direction.

The pair of substrates 2 and 3 are joined via a frame-shaped sealing material (not shown), and a nematic liquid crystal is filled in a region surrounded by the sealing material between the substrates 2 and 3. The liquid crystal layer 12 is formed by being sealed.

The orientation of the liquid crystal molecules of the liquid crystal layer 12 in the vicinity of the substrates 2 and 3 is regulated by the alignment films 10 and 11 provided on the inner surfaces of the pair of substrates 2 and 3, respectively. , 3 are twist-oriented at a twist angle of about 90 degrees.

Polarizing plates 13 and 14 are disposed on the outer surfaces of the pair of substrates 2 and 3, respectively, and one of the polarizing plates 13 has its transmission axis set to that of the substrate 2 adjacent to the polarizing plate 13. The other polarizing plate 14 is provided so as to be substantially orthogonal to or substantially parallel to the orientation direction of the liquid crystal molecules in the vicinity. The transmission axis of the other polarizing plate 14 is substantially orthogonal to or substantially parallel to the transmission axis of the one polarizing plate 13. It is provided in.

The liquid crystal display element 1 supplies a plurality of gate lines 6 with a gate signal having a waveform in which a selection period for turning on the TFT 5 is sequentially shifted, and a plurality of data lines 7 for each pixel row. By supplying a data signal having a waveform corresponding to the image data of each pixel unit in the row for each selection period, data is supplied from the data wiring 7 through the TFT 5 between the electrodes 4 and 8 of each pixel unit. Display driving is performed by applying a drive voltage corresponding to a potential difference between the pixel electrode 4 to which a signal is supplied and the counter electrode 8.

The driving method will be described. The wide viewing angle driving method according to the present invention employs a second method for obtaining a transmittance between the electrodes 4 and 8 of each pixel section of the liquid crystal display element 1 in accordance with image data. 1 and a second drive voltage V2 having a value different from the first drive voltage V1 by a predetermined value is alternately applied at a predetermined time ratio.

Here, the first drive voltage V1 is a voltage selected according to image data based on the voltage-transmittance characteristic of the liquid crystal display element 1, and the second drive voltage V2 is the first drive voltage V2. The second driving voltage V2 is a voltage obtained by shifting the voltage V1 to a high voltage side or a low voltage side. The second driving voltage V2 has a voltage difference in a range of 0.5 V to 1.5 V with respect to the first driving voltage V1. Preferably, the ratio of the application time of the first drive voltage V1 to the application time of the second drive voltage V2 is 1: 1 to 4: 1.

The drive voltages V1 and V2 applied between the electrodes 4 and 8 are switched by connecting the counter electrode 8 to the reference potential and changing the potential of the data signal supplied to the data wiring 7 according to the image data. The potential may be controlled by controlling the potential and the potential shifted to the high potential side or the low potential side, or a data signal of a potential corresponding to the image data is always supplied to the data wiring 7 to First electrode 8
May be performed by supplying a signal whose potential changes between when the driving voltage V1 is applied and when the second driving voltage V2 is applied.

In this wide viewing angle driving method, the first driving voltage V1 and the second driving voltage V2 applied between the electrodes 4 and 8 of the pixel section of each pixel row are, for example, 1
Switching is performed alternately for each field (period in which all pixel rows from the first row to the last row are sequentially selected).

FIG. 1 shows a first embodiment of the present invention.
The voltage is applied between the electrodes of the pixel sections of the first to last pixel rows L1 to Ln in the odd-numbered field and the even-numbered field (for example, n = 234 when the number of pixel rows of the liquid crystal display element is 234). It is a schematic diagram of a drive voltage, in which a solid line indicates a first drive voltage V1 and a broken line indicates a second drive voltage V2.

In this embodiment, the odd-numbered fields are
As shown in (a), a first method for obtaining a transmittance according to image data between electrodes of the pixel units of all the pixel rows L1 to Ln.
In the even-numbered fields, as shown in FIG. 1B, the first drive voltage V1 is applied between the electrodes of the pixel units of all the pixel rows L1 to Ln by 0.5 V to 1.5V
The second drive voltage V2 shifted to the high voltage side is applied, and the ratio of the application time of the first drive voltage V1 to the application time of the second drive voltage V2 is 1 field: 1 Field.

That is, in this driving method, the liquid crystal molecules in each pixel portion of the liquid crystal display element 1 are aligned in an alignment state in which a transmittance corresponding to the image data is obtained by applying the first driving voltage V1, An orientation state in which a viewing angle characteristic different from a viewing angle characteristic when the first driving voltage V1 is applied is obtained by applying the second driving voltage V2 different from the first driving voltage V1 by a predetermined value. , The viewing angle of each pixel portion is reduced by the first drive voltage V1.
And the second drive voltage V2 is changed according to the ratio of the application time of the second drive voltage V2. As in this embodiment, the first drive voltage V1 and the second drive voltage V2 are changed for each field. By switching alternately, the alignment state of the liquid crystal molecules becomes
For each field, the alignment state changes to an alignment state in which a transmittance corresponding to the image data is obtained and an alignment state in which a viewing angle characteristic different from the viewing angle characteristic when the first drive voltage V1 is applied is obtained. Therefore, the display having the viewing angle characteristic by the first drive voltage V1 and the display having the viewing angle characteristic V2 by the second voltage can be displayed with the combined viewing angle characteristic.

Therefore, according to this driving method, the apparent viewing angle of the liquid crystal display element 1 is reduced by the first driving voltage V
1 and the second drive voltage V2
Becomes a wide viewing angle obtained by synthesizing the viewing angle when the image is applied.

FIG. 2 shows a viewing angle-transmittance characteristic when the above-mentioned liquid crystal display element 1 is driven by eight gradations by the wide viewing angle driving method of the above embodiment, and FIG.
Shows the viewing angle-transmittance characteristics when 8 gradations are driven by applying only a drive voltage (first drive voltage V1) for obtaining a transmittance according to image data.

Each of these viewing angle-transmittance characteristics is a characteristic with respect to the vertical viewing angle of the screen. In FIGS. 2 and 3, the negative viewing angle is the lower edge of the screen with respect to the normal of the screen. The direction angle, + viewing angle, is the angle of the upper edge direction of the screen with respect to the normal line.

As can be seen by comparing FIGS. 2 and 3, the viewing angle-transmittance characteristic (the characteristic shown in FIG. 2) when driven by the wide viewing angle driving method of the above embodiment corresponds to the image data. The viewing angle at which the inversion of the gradation does not occur is lower than the viewing angle-transmittance characteristic (the characteristic of FIG. 3) when driving by applying only a driving voltage for obtaining a corresponding transmittance. It is a characteristic that spreads in the direction.

The viewing angle-transmittance characteristics shown in FIG. 2 are obtained by shifting the second drive voltage V2 to a higher voltage side by 0.5V to 1.5V with respect to the first drive voltage V1. The second drive voltage V2 is set to be lower than the first drive voltage V1 by 0.5V to 0.5V.
Even when the voltage is shifted by 1.5 V, similar viewing angle-transmittance characteristics can be obtained.

In the wide viewing angle driving method, the first driving voltage V1 for obtaining the transmittance according to the image data is used.
And a second drive voltage V2 having a value different from the first drive voltage V1 are alternately applied at a predetermined time ratio (1 field: 1 field in this embodiment) to obtain a wide viewing angle. Therefore, like the voltage control method or the alignment control method of the conventional pixel division method,
It is necessary to divide the electrode of one substrate of the liquid crystal display element into a plurality of electrodes for each pixel part, or to perform an alignment treatment on the inner surface of the substrate to align the liquid crystal molecules in different alignment states for each region of the pixel part Therefore, a wide viewing angle can be realized without changing the structure of the liquid crystal display element.

Further, in the wide viewing angle driving method, the second driving voltage V2 is set to 0.5 V to 1.5 V with respect to the first driving voltage V1 for obtaining the transmittance according to the image data.
Since the voltage has a voltage difference in the range of V, the brightness and contrast of the display may fluctuate by alternately applying the first drive voltage V1 and the second drive voltage V2 at a predetermined time ratio. Therefore, it is possible to display an image of good quality which is almost the same as the case of driving by applying the first drive voltage V1 for always obtaining the transmittance according to the image data.

In the above embodiment, the first drive voltage V
Since the ratio between the application time of 1 and the application time of the second drive voltage V2 is set to 1 field and 1 field, the first drive voltage V1 and the second drive voltage V2 alternate at a predetermined time rate. , There is no flickering of the display due to the application of the first driving voltage V1. Therefore, an image of good quality is displayed, which is almost the same as the case of driving by applying the first driving voltage V1 for always obtaining the transmittance according to the image data. be able to.

The wide-viewing-angle driving method of the above embodiment is as follows.
The second drive voltage V1 is a voltage having a voltage difference in the range of 0.5 V to 1.5 V with respect to the first drive voltage V1, and the application time of the first drive voltage V1 and the second drive voltage V1 Since the ratio of the drive voltage V2 to the application time is set to one field to one field, an image of better quality without fluctuations and flickers in brightness and contrast can be displayed.

FIG. 4 shows a second embodiment of the present invention.
It is a schematic diagram of the drive voltage applied between the electrodes of the pixel sections of the first to last pixel rows L1 to Ln (for example, n = 234) in the odd-numbered field and the even-numbered field. 1 indicates the driving voltage V1, and the broken line indicates the second driving voltage V2.

In this embodiment, the odd-numbered fields are
(A), every other pixel row (odd-numbered pixel row in the figure) L1, L3,...
A first drive voltage V1 for obtaining transmittance according to image data is applied, and another pixel row (an even-numbered pixel row in the figure) L
2, L4,..., Ln, a second drive voltage V2 obtained by shifting the first drive voltage V1 to a high voltage side or a low voltage side by 0.5 V to 1.5 V is applied. In the even-numbered field, as shown in FIG. 4B, the second drive voltage V2 is applied between the electrodes of the pixel units of the other pixel rows L1, L3,. The first drive voltage V1 is applied between the electrodes of the pixel units of the other pixel rows L2, L4,... Ln, and the application time of the first drive voltage V1 to the pixel units of each pixel row and , Second
The ratio of the drive voltage V2 to the application time is 1 field: 1 field as in the first embodiment.

According to the driving method of this embodiment, similarly to the first embodiment, a wide viewing angle can be realized without changing the structure of the liquid crystal display element. An image of good quality without fluctuations and flickers can be displayed.

In the first and second embodiments,
The ratio between the application time of the first drive voltage V1 and the application time of the second drive voltage V2 is set to 1 field: 1 field. However, this time ratio may be arbitrarily set, and is not limited to a field unit. (Period of displaying an image for one screen, 1 frame = 1 to several fields) The time ratio may be set in units.

The application time of the first drive voltage V1 and the second
As described above, the ratio of the drive voltage V2 to the application time of the drive voltage V2 is preferably in the range of 1: 1 to 4: 1. In this range, flicker does not occur in display.

However, when the first drive voltage V1 and the second drive voltage V2 are applied at a time ratio of 1: 1 and the time ratio is used as a field unit, the number of fields per unit is 5 fields. When the ratio of the application time of the first drive voltage V1 to the application time of the second drive voltage V2 is in the range of 1 to 5 fields: 1 to 5 fields, display without flicker is performed. Obtainable.

When the first drive voltage V1 and the second drive voltage V2 are applied at different time ratios, for example, at a time ratio of 4: 1, when the time ratio is set to the field unit, It is preferable that the number of applied fields of the drive voltage V1 be 8 fields or less and the number of applied fields of the second drive voltage V2 be 2 fields or less. The application time of the first drive voltage V1 and the application of the second drive voltage V2 are preferable. If the ratio with time is in the range of 1 to 8 fields: 1 to 2 fields, display without flicker can be obtained.

Further, the wide-viewing-angle driving method according to the above-described embodiment always uses the first method for obtaining the transmittance according to the image data.
And the second drive voltage V2 having a value different from the first drive voltage V1 are alternately applied at a predetermined time ratio, but when the viewing angle may be narrow, ,
The liquid crystal display element 1 may be driven by applying only the first drive voltage V1, and the liquid crystal display element 1 is driven by alternate application of the first drive voltage V1 and the second drive voltage V2. By switching between driving and driving by applying only the first driving voltage V1, the display mode of the liquid crystal display device 1 can be switched between the wide viewing angle mode and the standard viewing angle mode.

Further, the wide viewing angle driving method of the present invention is not limited to the above-mentioned TN type liquid crystal display device, and for example, the twist angle of liquid crystal molecules is set to 180 to 270 degrees (generally, 230 to 270 degrees).
250 °) can be applied to driving of an STN type liquid crystal display element or the like.

[0057]

According to the wide viewing angle driving method of the present invention, a first driving voltage for obtaining a transmittance corresponding to image data is provided between electrodes of each pixel portion of a liquid crystal display element and a predetermined value. And a second drive voltage having a value different from the first drive voltage is alternately applied at a predetermined time ratio, and a display having a viewing angle characteristic by the first drive voltage and the second voltage are applied. Since the display having the viewing angle characteristic of the liquid crystal display element is combined with the display having the viewing angle characteristic, a wide viewing angle can be realized without modifying the structure of the liquid crystal display element.

In the wide-viewing-angle driving method according to the present invention, the second driving voltage is set to be 0.1 to 1.0 with respect to the first driving voltage.
It is preferable that the voltage has a voltage difference in the range of 5 V to 1.5 V. Thus, by selecting the second drive voltage,
An image of good quality is displayed, which is almost the same as when driving by applying a first driving voltage for always obtaining a transmittance according to image data, without causing fluctuations in display brightness and contrast. be able to.

Further, the application time of the first drive voltage,
The ratio of the second drive voltage to the application time is 1: 1 to 4: 1.
By doing so, it is almost the same as the case of driving by applying the first driving voltage for always obtaining the transmittance according to the image data without causing the display to flicker. Good quality images can be displayed.

Further, as described above, the second drive voltage is a voltage having a voltage difference in the range of 0.5 V to 1.5 V with respect to the first drive voltage, and the application time of the first drive voltage and When the ratio of the application time of the second drive voltage to the application time is set to 1: 1 to 4: 1, an image of better quality without fluctuation and flicker of brightness and contrast can be displayed.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a driving voltage applied between electrodes of pixel units in pixel rows L1 to Ln in a first row to a last row in an odd field and an even field, showing a first embodiment of the present invention; .

FIG. 2 is a view angle-transmittance characteristic diagram when the liquid crystal display element is driven by eight gradations by the wide viewing angle driving method of the first embodiment.

FIG. 3 is a view angle-transmittance characteristic diagram when the same liquid crystal display element is driven by 8 gradations by applying only a drive voltage for obtaining a transmittance according to image data.

FIG. 4 is a schematic diagram of a driving voltage applied between the electrodes of the pixel units of the first to last pixel rows L1 to Ln in the odd-numbered field and the even-numbered field according to the second embodiment of the present invention; .

FIG. 5 is a cross-sectional view of a part of a liquid crystal display element.

FIG. 6 is an equivalent circuit plan view of one substrate of the liquid crystal display element.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Liquid crystal display element 4 ... Pixel electrode 5 ... TFT 8 ... Counter electrode V1 ... 1st drive voltage for obtaining the transmittance according to image data V2 ... 2nd drive of a value different from 1st drive voltage Voltage

Claims (3)

[Claims] 1. A first driving voltage for obtaining a transmittance according to image data between electrodes of each pixel portion of a liquid crystal display element, and a value different from the first driving voltage by a predetermined value. And a second driving voltage are alternately applied at a predetermined time ratio, and a display having a viewing angle characteristic by the first driving voltage and a display having a viewing angle characteristic by the second voltage are displayed. A wide-viewing-angle driving method for a liquid crystal display element, wherein a display is performed with synthesized viewing-angle characteristics. 2. The liquid crystal display according to claim 2, wherein the second driving voltage is a voltage having a voltage difference in a range of 0.5 V to 1.5 V with respect to the first driving voltage. A method for driving a device at a wide viewing angle. 3. The method according to claim 1, wherein the ratio of the application time of the first drive voltage to the application time of the second drive voltage is 1: 1 to 4: 1. Wide viewing angle driving method for liquid crystal display element.