JPH0643493A - Driving method for liquid crystal display device - Google Patents

Abstract

PURPOSE:To obtain a satisfactory image quality by setting separately an offset voltage to an optimal voltage in each of a write time and a non-write time, and varying it in accordance with a temperature. CONSTITUTION:As for a positive side characteristic of an asymmetrical voltage- current characteristic of a non-linear resistance element, in a curve A for showing a characteristic at the time of 25 deg.C, and a curve M of 40 deg.C, a current value corresponding to the same voltage is different in accordance with a temperature. Moreover, in a negative side characteristic, as well, in a curve B for showing a characteristic at the time of 25 deg.C, and a curve N of 40 deg.C, a current value corresponding to the same voltage is different. A middle point of a voltage of the positive side and the negative side corresponding to an ON current of the non-linear resistance element at a write time determined from a dividing voltage corresponds to P3 in the case of C, and an offset voltage becomes Voff3. Also, in the case of 40 deg.C, the middle point of the voltage of the positive side and the negative side corresponding to the ON current corresponds to P5, and the offset voltage becomes Voff5. Accordingly, the offset voltage Voff3 and Voff5 at temperatures of 25 deg.C and 40 deg.C are not equal to each other.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-linear resistance element whose current-voltage (IV) characteristic asymmetry varies depending on temperature.
The present invention relates to a driving method of a liquid crystal display device having a non-linear resistance element.

[0002]

2. Description of the Related Art In recent years, a display device using a liquid crystal panel has been steadily increasing in capacity. However, a method of using a multiplex drive for a display device having a simple matrix structure has a higher contrast as the time division becomes higher. Or the response speed decreases. Therefore, it is difficult to obtain sufficient contrast in the liquid crystal display device having about 200 scanning lines.

Therefore, in order to eliminate the above-mentioned drawbacks, an active matrix liquid crystal display panel in which a switching element is provided in each pixel is adopted.

The active matrix liquid crystal display panel is
When roughly classified, there are a three-terminal system using a thin film transistor and a two-terminal system using a non-linear resistance element, but the two-terminal system is superior in terms of structure and manufacturing process.

For the two-terminal system, a diode type, a varistor type, a MIM (metal-insulator-metal) type and the like have been developed. Among them, the MIM type has a simple structure and a short manufacturing process. It has features.

The circuit diagram of FIG. 8 shows a panel structure of a liquid crystal display panel using a non-linear resistance element.

Scan electrodes S1 to SN and signal electrodes D1 to D
N is provided on the facing surface of each of the two glass substrates. Further, a display pixel including a non-linear resistance element 41 and a liquid crystal pixel 42 is formed at the intersection of each scanning electrode and signal electrode.

When a driving voltage for turning on the liquid crystal pixel 42 is applied, the resistance of the non-linear resistance element 41 is small, and the liquid crystal pixel is turned on with a small time constant. On the other hand, when the drive voltage is turned off, the resistance of the non-linear resistance element 41 exhibits a large value and discharges with a large time constant.

As a result, the ratio of the effective value of the voltage applied to the liquid crystal at the time of "on" and "off" becomes large, and high-density multiplex driving becomes possible.

Some non-linear resistance elements exhibit asymmetric non-linear resistance characteristics depending on the polarity of the applied voltage. This will be described with reference to the graph showing the transmittance characteristic with respect to the write voltage in FIG.

As shown in the graph of FIG. 9, the transmittance has an asymmetrical characteristic with respect to the applied voltage at the time of writing due to the asymmetrical nonlinear characteristic of the nonlinear resistance element between the positive side characteristic and the negative side characteristic. Shows.

Due to this asymmetrical transmittance characteristic, when the display is performed with the same write voltage V10, the transmittance is T10 for the positive side characteristic and the transmittance T for the negative side characteristic.
Eleven. Therefore, flicker occurs due to the transmittance difference ΔT, and a screen flickering phenomenon occurs.

Furthermore, in this case, the difference in transmittance is
That is, since the difference in voltage applied to the liquid crystal is applied to the liquid crystal as a direct current voltage, it causes image sticking which is an afterimage phenomenon due to bias of ions in the liquid crystal.

Here, the positive side is a case where a positive voltage is applied to the non-linear resistance element when the display pixel is regarded as an equivalent circuit in which the non-linear resistance element and the liquid crystal pixel are connected in series. On the other hand, the negative side is a case where a negative voltage is applied.

Next, the current-voltage characteristics of the non-linear resistance element exhibiting an asymmetric non-linear characteristic will be described with reference to FIG. FIG. 7 is a graph showing the voltage-current characteristic, which is the main characteristic of the nonlinear resistance element.

As shown in the graph of FIG. 7, the current-voltage characteristic of the non-linear resistance element shows a large asymmetric characteristic with respect to the direction of the applied voltage.

In the graph of FIG. 7, the curve A shows the positive-side element characteristic, and the curve B shows the negative-side element characteristic.

When the liquid crystal display panel is driven by multiplex, normally, the voltage to be written in the liquid crystal pixels is inverted for each field, which is the period from a certain scan to the next scan of the same line, or for each line. The AC drive method is used.

However, when the nonlinear resistance element used here exhibits asymmetrical nonlinear characteristics on the positive side and the negative side as shown in the graph of FIG. 7, the voltage applied to the liquid crystal pixel will be examined. The voltage applied to the non-linear resistance element is different between the positive side and the negative side.

Therefore, the voltage applied to the liquid crystal pixel is
There is a difference between the positive side and the negative side, and the image flickering due to flicker and the image sticking which is the afterimage phenomenon due to the bias of ions in the liquid crystal of the image occur, and the display quality of the liquid crystal display device is remarkably increased. descend.

On the other hand, an example of a driving method for compensating for this asymmetrical non-linear resistance element characteristic and improving the display quality will be described with reference to FIG. 10 showing the driving waveform and FIG. 7 showing the current-voltage characteristic. explain.

The characteristic of this driving method is that, as shown in the driving waveform diagram of FIG. 10, a different offset voltage, that is, Voff, is set between when writing to the scan electrode and when not writing.
2 is to apply Voff3. Where Vof
The offset voltages of f2 and Voff3 are set as follows.

First, on the graph showing the voltage-current characteristics in the non-linear resistance element of FIG. 7, the on-current of the element at the time of writing and the off-current of the element at the time of non-writing which are determined by the drive voltage are set.

Then, the voltage corresponding to the midpoint P1 of the positive side and negative side voltages corresponding to the ON current is obtained, and this voltage is Voff.
Set to 3. Similarly, a voltage corresponding to the midpoint P2 of the positive side voltage and the negative side voltage corresponding to the off-current is obtained, and this is calculated as Voff2.
And

As described above, not only the offset voltage is applied, but the offset voltage is set independently during writing and during non-writing. As a result, it is possible to drive the liquid crystal display device more accurately corresponding to the voltage-current characteristics of the positive and negative sides of the nonlinear resistance element.

[0026]

However, the current-voltage characteristics of the non-linear resistance element change when the temperature of the operating environment changes in this liquid crystal display panel.

Therefore, the change in temperature causes the contrast of the liquid crystal display device to decrease. Further, since the above-described offset voltages Voff2 and Voff3 change, it is impossible to prevent the image flickering phenomenon and image sticking due to flicker with a constant offset voltage, and it is not possible to sufficiently satisfy the display quality. .

Therefore, the display quality of the liquid crystal display device deteriorates depending on the environment in which the liquid crystal display device is used, and further, the display quality cannot be restored due to the temperature change, and the display quality deteriorates.

Therefore, even when the above-mentioned non-linear resistance element changes in temperature in the use environment and the current-voltage characteristic of the non-linear resistance element changes, contrast deterioration, flicker phenomenon, and image sticking occur at each temperature. It is necessary to prevent the phenomenon. Furthermore, it is necessary to overcome the disadvantage that the two-terminal system is slightly inferior to the three-terminal system.

It is an object of the present invention to solve the above problems and provide a method for driving a liquid crystal display device having good image quality.

[0031]

In order to achieve the above object, the following driving method is adopted in the driving method of the liquid crystal display device of the present invention.

The driving method of a liquid crystal display device of the present invention is a driving method of an active matrix liquid crystal display device in which a writing voltage and a non-writing voltage are applied to a non-linear resistance element arranged in a matrix form via a scanning signal and a display signal. In, at least one of the scanning signal and the display signal is applied with an offset voltage for compensating for the asymmetry in the current-voltage characteristics of the non-linear resistance element, and this offset voltage is separately applied in writing and non-writing. It is characterized in that it has an optimum value, and that the write voltage, the non-write voltage, and the offset voltage are changed according to the temperature.

The driving method of a liquid crystal display device of the present invention is a driving method of an active matrix liquid crystal display device in which a writing voltage and a non-writing voltage are applied to a non-linear resistance element arranged in a matrix form via a scanning signal and a display signal. In, the offset voltage for compensating for the asymmetry in the current-voltage characteristics of the non-linear resistance element is applied to the scanning signal, and this offset voltage is set to the optimum value individually at the time of writing and at the time of non-writing. The non-writing voltage and the offset voltage are changed according to the temperature.

The driving method of a liquid crystal display device of the present invention is a driving method of an active matrix liquid crystal display device in which a writing voltage and a non-writing voltage are applied to a non-linear resistance element arranged in a matrix form via a scanning signal and a display signal. In, the offset voltage for compensating for the asymmetry in the current-voltage characteristics of the non-linear resistance element is applied to the scanning signal, and this offset voltage is set to the optimum value in each of writing and non-writing. It is characterized in that the offset voltage from the voltage is changed depending on the temperature.

[0035]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A method of driving a liquid crystal display device according to an embodiment of the present invention will be described below with reference to the drawings.

The structure of the liquid crystal display panel used in this embodiment is the same as the structure used in the conventional driving method shown in FIG. Furthermore, the non-linear resistance element has the same characteristics as those used in the conventional driving method, and the voltage-current characteristics thereof have the characteristics shown in the graph of FIG.

The driving method of the liquid crystal display device of the present invention will be described in detail below with reference to the graph showing the temperature dependence of the voltage-current characteristics of the non-linear resistance element and the driving waveform diagram showing the driving waveform of the liquid crystal display panel. explain.

FIG. 1 is a graph showing the temperature dependence of the voltage-current characteristics of the non-linear resistance element. FIG. 2 is a drive waveform diagram showing a scanning signal waveform applied to the scanning electrodes of the liquid crystal display panel and a display signal waveform applied to the signal electrodes.
The scanning signal waveforms at 5 ° C. and 40 ° C. are shown. FIG. 3 is a graph showing changes in transmittance of liquid crystal pixels corresponding to display signals. FIG. 4 is a graph showing a change in contrast depending on the temperature of the liquid crystal display panel. FIG. 5 is a graph showing changes in the offset voltage Voff1 with temperature. An embodiment of the present invention will be described below by alternately using FIG. 1, FIG. 2, FIG. 3, FIG. 4, and FIG.

As shown in the graph of FIG. 1, the positive side characteristics of the asymmetrical voltage-current characteristics of the non-linear resistance element are a curve A showing the characteristics at 25 ° C. and a curve M showing the characteristics at 40 ° C. In and, the current value corresponding to the same voltage differs depending on the temperature.

Further, also in the negative side characteristic of the current-voltage characteristic of the non-linear resistance element, the curve B showing the characteristic at 25 ° C. and the curve N showing the characteristic at 40 ° C. correspond to the same voltage. The current value is different.

That is, for the positive side characteristic, the difference P between the curve A and the curve M, and for the negative side characteristic, the curve B and the curve N.
And a difference Q with

Further, regarding the positive side characteristic and the negative side characteristic, the amount of change in current due to temperature, that is, the positive side characteristic, the difference P between the curve A and the curve M, and the negative side characteristic, the curve B.
And the difference N between the curve N and the curve N are not equal to each other.

The midpoint between the positive side voltage and the negative side voltage corresponding to the ON current of the non-linear resistance element at the time of writing, which is determined from the driving voltage in the graph showing the voltage-current characteristic, is P at 25 ° C.
3 and the offset voltage is Voff3.

Further, in the case of 40 ° C., the midpoint of the positive side voltage and the negative side voltage corresponding to the ON current corresponds to P5, and the offset voltage becomes Voff5.

Therefore, the offset voltages Voff3 and Vo corresponding to the ON currents at the temperatures of 25 ° C. and 40 ° C.
Not equal to ff5.

Next, when the midpoint between the positive side voltage and the negative side voltage corresponding to the off current of the element at the time of non-writing determined by the drive voltage in the graph showing the voltage-current characteristics is 25 ° C., P
2 and the offset voltage is Voff2.

Further, in the case of 40 ° C., the midpoint of the voltage on the positive side and the voltage on the negative side corresponding to the off current corresponds to P4, and the offset voltage is Voff4.

Therefore, the offset voltages Voff2 and Vof corresponding to the off currents at the temperatures of 25 ° C. and 40 ° C.
Not equal to f4.

That is, in the embodiment of the present invention, the voltage value for obtaining the on-current has a large difference between the temperatures of 25 ° C. and 40 ° C., and the offset voltage corresponding to the on-current also has the temperatures of 25 ° C. and 40 ° C. There is a big difference from the temperature. In addition, the voltage value for obtaining the off current is 4
There is a large difference at 0 ° C., and the offset voltage corresponding to the off current also has a large difference at temperatures of 25 ° C. and 40 ° C.

FIG. 2 shows the drive waveforms of the scanning signal and the display signal at the temperature of 25 ° C. and the temperature of 40 ° C. for driving the liquid crystal display panel.

In the embodiment of the present invention, a voltage for compensating the temperature of the non-linear resistance element is added to the scanning signal side. First, the case where the temperature is 25 ° C. will be described.

The voltage for writing the scanning signal is
The positive field is a1 and the negative field is b1.

Voltage c1 when scanning signal is not written
(Positive field) and d1 (Negative field)
The offset voltage Voff2 is added to the bias voltages Vbias1 and Vbias2.

By applying this bias voltage,
Since the voltage applied to the non-linear resistance element at the time of non-writing can be reduced by adding the same voltage amplitude of the display signal as when the bias voltage is not applied, the resistance of the non-linear resistance element can be increased.

Therefore, at the time of writing, the charge accumulated in the liquid crystal is not discharged through the element at the time of non-writing, so that the ratio of the effective value of the voltage applied to the liquid crystal at the time of ON and OFF becomes large. It enables high-density multiplex drive.

Here, as the bias voltage, a voltage at which the transmittance of the liquid crystal pixel not passing through the non-linear resistance element is 50% is used.

The display signal this time is Vd1 centered on Vd0.
With the amplitude g1 of (Vd4) to Vd2 (Vd3), a gradation display is performed by the pulse width during writing.

FIG. 3 is a graph showing the change in transmittance of the liquid crystal pixel when the display signal voltage is changed around Vd0. The display mode of the liquid crystal panel is normally black.

The display signal voltage corresponding to the black display is Vd1 in the case of the positive field and Vd3 in the case of the negative field.
Is. The display signal voltage corresponding to the white display is
Vd2 in the case of a negative field and Vd4 in the case of a negative field.

Next, the case of the temperature of 40 ° C. in the driving method of the liquid crystal display device of the present invention will be described.

As shown in FIG. 2, the voltage at the time of writing the scanning signal is a2 for the positive side field and b for the negative side field.
It is 2.

Voltage c2 when the scanning signal is not written
(Positive field) and d2 (Negative field)
The bias voltage is Vbias3 and Vbias4 plus an offset voltage Voff4.

Here, the bias voltage is a voltage at which the transmittance of the liquid crystal pixel without passing through the non-linear resistance element is 50%. Since the temperature is different between 25 ° C. and 40 ° C., compensation is performed depending on the temperature. .

Next, the display performance in the driving method of the liquid crystal display device of the present invention will be described with reference to the graph of FIG.

A curve E shown in FIG. 3 shows the voltages (a1, b1, c) shown in the driving waveform diagram of FIG. 2 at a temperature of 25 ° C.
1, d1, Voff3, Voff2) is a curve showing the change in transmittance when the optimization is performed, and the curve G is a temperature of 25 ° C. and a temperature of 40 ° C. using each optimized voltage.
4 is a curve showing a change in transmittance when driven at.
Next, the curve F will be described.

In FIG. 2, the voltage at the time of writing the scanning signal is changed to a2 for the positive side field and b2 for the negative side field so as to be a voltage corresponding to the ON current of the element at 40 ° C.

Offset voltage Voff of the voltages a2 and b2
5 is not equal to the offset voltage Voff3 of the voltages a1 and b1.

Voltage c2 when the scanning signal is not written
And d2 are bias voltages Vbias3 and Vb, respectively.
The offset voltage Voff4 is added to ias4.

That is, the curve F shown in the graph of FIG.
Each voltage (a2, b2, c shown in FIG. 2 at a temperature of 40 ° C.
2, d2, Voff5, Voff4) is a curve showing a change in transmittance when optimization is performed.

The display quality of the liquid crystal display device includes contrast and brightness. The contrast is shown in FIG. 2 by the transmittance (T2) of Vd1 or Vd4 and Vd2.
Alternatively, the ratio of the transmittance of Vd3 (T1) (T1 / T2 ×
100%).

The brightness can be indicated by the magnitude of the transmittance T1. Compared to the curve E, the curves F and G have display signal voltage values of Vd1 (Vd4) and Vd2 (Vd3).
The transmittance changes abruptly with increasing distance from.

This occurs because the OFF current of the non-linear resistance element increases with temperature, and the charge accumulated in the liquid crystal capacitance during non-writing is discharged through the non-linear resistance element.

However, it is understood that the curves F and G have a large difference in display quality even if the same temperature of 40 ° C. and the same nonlinear resistance element are used.

FIG. 4 is a graph showing changes in contrast with temperature.

Curve C in FIG. 4 shows a temperature of 0 ° C. to 80 ° C.
In the range of ° C, the temperature dependence of the contrast when the writing voltage, the writing offset voltage, the non-writing voltage, and the non-writing offset voltage are optimized is shown every 1 ° C.

Further, the curve D in FIG.
Each voltage (a1, b1, c1, d1,
The optimum value of Voff3, Voff2, c1) is used to show the temperature dependence of the contrast when driven at each temperature.

As shown in the graph of FIG. 4, the curve C shows a decrease in contrast as the temperature increases, but as compared with the curve D, it is possible to clearly prevent the decrease in contrast. .

FIG. 5 is a graph showing the temperature dependence of the offset voltage corresponding to the ON current.

As shown in the graph of FIG. 5, it can be seen that there is a voltage difference of 2.5 volts between the temperatures of 0 ° C. and 70 ° C.

If the offset voltage is not compensated by the temperature, a DC voltage of 2.5 V is applied to the liquid crystal.

In recent years, the liquid crystal has been improved and the image sticking phenomenon when applying a direct current has been improved, but the direct current voltage application is limited to 0.3 to 0.5 volt.

Therefore, the voltage of 2.5 V is a voltage large enough to cause deterioration of the liquid crystal, and it is necessary to compensate the offset voltage with temperature.

In the embodiment of the present invention, the following coefficients are used for temperature compensation of each voltage. a1-Voff3: -100 mv / ° C b1-Voff3: 100 mv / ° C Voff3: 35 mv / ° C c1: 20 mv / ° C d1: 10 mv / ° C Voff2: 10 mv / ° C

As shown in the above embodiments, by compensating each voltage with temperature, it is possible to prevent the contrast from decreasing even in a non-linear resistance element in which the asymmetry of the voltage-current characteristic varies with temperature.

Further, it becomes possible to prevent the direct current from being applied to the liquid crystal, and the image flickering phenomenon due to flicker,
It is also possible to prevent the image sticking phenomenon. That is, it is possible to improve the display quality of the liquid crystal display panel.

As shown in this embodiment, for example, Vof
The temperature dependence of the offset voltage at the time of non-writing corresponding to f2 and the bias voltage corresponding to Vbias1 is
When the voltage at the time of writing or the offset voltage at the time of writing is small, the purpose of this bias voltage and the offset voltage at the time of non-writing is to make the voltage applied to the non-linear resistance element at the time of non-writing as small as possible. Moreover, this is to make the positive field side and the negative field side symmetrical.

Therefore, if the charge accumulated in the liquid crystal at the time of writing is not discharged through the element at the time of non-writing, temperature compensation can be omitted.

That is, the display quality of the liquid crystal display panel can be improved by compensating the voltage during writing and the offset voltage during writing with temperature. Furthermore, since the number of temperature compensation items can be reduced, the circuit can be simplified.

FIG. 6 is a drive waveform diagram showing scan signals and display signals for driving a liquid crystal display panel in another embodiment of the present invention.

The difference between the driving waveforms shown in FIGS. 6 and 2 is that in FIG. 2, an offset voltage corresponding to the ON current or a voltage for compensating the temperature dependence of each voltage is applied only to the scanning signal. .

On the other hand, the drive waveform shown in FIG. 6 displays the voltage for compensating the temperature dependence of the offset voltage corresponding to the ON current and the voltage for compensating the temperature dependence of the voltage at the time of writing. This is an example of applying the signal.

The voltage for writing the scanning signal is
The positive field is a1 and the negative field is b1.

Voltage c1 when the scanning signal is not written
(Positive field) and d1 (Negative field)
The offset voltage Voff2 is added to the bias voltages Vbias1 and Vbias2.

The display signal has an amplitude g1 of Vd1 to Vd2 centered on Vd0 at 25 ° C., but at 40 ° C., it is offset from Vd0 to give a voltage corresponding to the ON current of the nonlinear resistance element. The amplitude g2 is centered around the point shifted by the voltage ΔVd.

By thus applying the temperature compensation voltage to the display signal side, the off current of the non-linear resistance element increases with temperature.

Therefore, it is possible to prevent the deterioration of the contrast caused by the electric charge accumulated in the liquid crystal capacitance during the non-writing operation being discharged through the non-linear resistance element.

[0097]

As is apparent from the above description, according to the driving method of the liquid crystal display panel of the present invention, each voltage value of the scanning signal and the display signal is compensated corresponding to the temperature dependence of the nonlinear resistance element. I am doing it. Therefore, each voltage can be set more accurately, and even if the temperature of the environment for driving the liquid crystal display panel changes, it is possible to prevent the deterioration of the contrast. Further, the flicker phenomenon and the image burn-in phenomenon can be prevented, and the display quality can be improved. Furthermore, the burn-in phenomenon can be improved to the extent that it is as good as that of the three-terminal system.

[Brief description of drawings]

FIG. 1 is a graph showing temperature dependence of voltage-current characteristics of a non-linear resistance element according to an example of the present invention.

FIG. 2 is a drive waveform diagram showing a scanning signal waveform applied to a scanning electrode and a display signal waveform applied to a signal electrode side of a liquid crystal display panel in an example of the present invention.

FIG. 3 is a graph showing a change in transmittance of liquid crystal pixels corresponding to a display signal in the example of the present invention.

FIG. 4 is a graph showing a change in contrast according to a temperature of a liquid crystal display panel in an example of the present invention.

FIG. 5 is a graph showing a change in offset voltage according to a temperature of a liquid crystal display device according to an embodiment of the present invention.

FIG. 6 is a driving waveform diagram showing a scanning signal waveform applied to a scanning electrode and a display signal waveform applied to a signal electrode side of a liquid crystal display panel according to another embodiment of the present invention.

FIG. 7 is a graph showing voltage-current characteristics of a non-linear resistance element having an asymmetric non-linear characteristic.

FIG. 8 is a circuit diagram showing a configuration of a liquid crystal display panel including a non-linear resistance element.

FIG. 9 is a graph showing the relationship between the write voltage and the transmittance.

FIG. 10 is a drive waveform diagram of a scanning signal in a conventional drive method.

[Explanation of symbols]

a1 Signal level of scanning signal at the time of writing at 25 ° C. in the positive side field b1 Signal level of scanning signal at the time of writing at 25 ° C. in the negative side field Voff2 Offset voltage of 25 ° C. at off current Voff3 25 at on-current Offset voltage a2 a2 Signal level of scanning signal at the time of writing at 40 ° C in the positive field b1 Signal level of scanning signal at the time of writing of 40 ° C in the negative field Vb2 Writing at 40 ° C in the negative field Level of scanning signal at the time Voff4 Offset voltage of 40 ° C at off current Voff5 Offset voltage of 40 ° C at on current g1 Amplitude of display signal

Claims (3)

[Claims] 1. A method of driving an active matrix liquid crystal display device, wherein a writing voltage and a non-writing voltage are applied to a non-linear resistance element arranged in a matrix form via a scanning signal and a display signal, and at least the scanning signal or the display signal is at least An offset voltage for compensating for the asymmetry in the current-voltage characteristics of the non-linear resistance element is applied to one side, and this offset voltage is set to an optimum value individually for writing and non-writing, and the A method for driving a liquid crystal display device, wherein a write voltage and an offset voltage are changed according to temperature. 2. A driving method of an active matrix liquid crystal display device, wherein a writing voltage and a non-writing voltage are applied to a non-linear resistance element arranged in a matrix form via a scanning signal and a display signal, the non-linear resistance element being applied to the scanning signal. An offset voltage for compensating for the asymmetry in the current-voltage characteristic is applied, and this offset voltage is set to an optimum value individually for writing and non-writing, and the writing voltage, the non-writing voltage, and the offset voltage are set to A method for driving a liquid crystal display device, which is characterized by changing the temperature according to temperature. 3. A driving method of an active matrix liquid crystal display device, wherein a writing voltage and a non-writing voltage are applied to a non-linear resistance element arranged in a matrix form via a scanning signal and a display signal, in the method of driving the non-linear resistance element to the scanning signal. An offset voltage is applied to compensate for the asymmetry in the current-voltage characteristics, and this offset voltage is set to the optimum value during writing and non-writing, and the offset voltage between the writing voltage and the writing voltage is changed according to the temperature. A method of driving a liquid crystal display device, comprising: