JPH06161390A - Method for driving liquid crystal display device - Google Patents

Abstract

PURPOSE:To apply a compensation voltage before and after the voltage level of a scanning signal which turns ON a switching transistor(TR). CONSTITUTION:An effective DC voltage component applied to a liquid crystal material is compensated even when an up-down inverted image is displayed on the same liquid crystal panel, not to mention a normal image display, thereby providing a liquid crystal panel of excellent picture quality which has neither a flicker nor image sticking. There is the effect of compensating the DC voltage component irrelevantly to whether an additional capacitor for holding electric charges is formed between each pixel electrode and a front-stage or rear-stage scanning signal electric conductor. The need to form two kind of panels, i.e., a panel for normal image display and a panel for up-down inverted display is eliminated and both images can be displayed on one panel, so the manufacture process is simplified.

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, and more particularly to a method for driving a liquid crystal display device which applies a compensation voltage to both sides of a voltage level for turning on the switching transistor of a scanning signal.

[0002]

2. Description of the Related Art FIG. 5 shows an equivalent circuit of a conventional active matrix type liquid crystal panel. Further, FIG. 6 shows an equivalent circuit of one pixel. 5 and 6, 1 is a scanning signal supply circuit, 2 is an image signal supply circuit, 3 is a counter electrode signal supply circuit, 4 is a counter electrode wiring, G _{(1) to} G _(X) are scanning signal wirings, and S is _{(1) to} S _(Y) are image signal lines, 8 is a switching transistor, 9 is a pixel electrode, 10 is a gate-drain capacitance C _GD of the switching transistor, 11 is an additional capacitance C _S , and 12 is a capacitance C of the liquid crystal material. _LC , V _{G (1)} ~ V
_{G (X)} is a scanning signal applied to the scanning signal wirings G _{(1) to} G _(X) , and VG _(n-1) is applied to the _(n-1) th scanning signal wiring G _(n-1). Scan signal, V _{G (n)} is the n-th scan signal line G
_The scanning signals applied to _(n) , V _{S (1) to} V _{S (Y),} are the image signals applied to the image signal wirings S _{(1) to} S _(Y) , V S
_{S (m)} is an image signal applied to the m-th image signal wiring S _(m) , V _T is a counter electrode signal applied to the counter electrode wiring 4,
V _{P (n, m)} is a signal voltage appearing at the pixel electrode 9 connected to the n-th scanning signal line G _(n) and the m-th image signal line S _(m) via the switching transistor 8.

FIG. 7 shows the scanning signal wirings G _{(1) to} G shown in FIG.
_(X) in the applied scanning signal V _{G (0)} is ~V G _(X). The scanning signals V _{G (0) to} V _{G (X)} are signals for turning on / off the switching transistor 8, and the scanning signal line V _{G (1).}
To V _{G (X)} are sequentially supplied to turn on the switching transistor 8.

FIG. 8 shows the n-1 th scanning signal V _{G (n-1)} and the n th scanning signal V _{G (n)} , the m th image signal V _{S (m)} and the counter electrode signal in FIG. FIG. 8 is a diagram showing voltage waveforms of a signal voltage V _{P (n, m)} appearing at a pixel electrode connected to V _T and an n-th scanning signal line and an m-th image signal line via a switching transistor. From FIG. 8, the signal voltage V _{P (n, m)} of the pixel electrode decreases by ΔV at time t ₂ , but at time t ₃ and t ₄ , the compensation voltage is applied, and finally the voltage decrease of ΔV is compensated. Voltage V _S ⁺
-V _TC is applied to the liquid crystal. Therefore, the image signal V
The center value (average value) of _{S (m)} and the center value (average value) V _{PC of the} voltage V _P appearing on the pixel electrode match, and the level V _TC of the counter electrode signal is matched with this, so that flicker and burn-in are caused. Will not occur. This is because, as shown in FIG. 7, the scanning signal wirings G _{(1) to} G _(X) are arranged from the top to the bottom of FIG.
_This is the case when scanning is performed from _{(1) in the} G _(X) direction.

[0005]

However, in a liquid crystal projector or the like, light transmitted through the liquid crystal panel is reflected by a reflection mirror or the like to form an image. Therefore, in such a liquid crystal panel, the display image is vertically inverted. There are things that have to be done.

That is, as shown in FIG. 9, in the liquid crystal projector, after the light of the metal halide lamp 13 is individually transmitted to each of the green liquid crystal panel 14, the red liquid crystal panel 15, and the blue liquid crystal panel 16, They combine to form an image, but the light paths are different. In the green liquid crystal panel 14, the light from the metal halide lamp 13 is reflected by the first total reflection mirror 17 and the first dichroic mirror 1.
8 and transmits through the second dichroic mirror 19 and the liquid crystal panel 14 for green, and the second total reflection mirror 20.
Is reflected and transmitted through the fourth dichroic mirror 21 to be taken out. Further, in the red liquid crystal panel 15, the light of the metal halide lamp 13 is reflected by the first total reflection mirror 17, the first dichroic mirror 18, and the second dichroic mirror 19, and is transmitted through the red liquid crystal panel 15. The fourth dichroic mirror 22 and the third dichroic mirror 21 are reflected and taken out. Further, in the blue liquid crystal panel 16, the light of the metal halide lamp 13 is reflected by the first total reflection mirror 17, is transmitted through the first dichroic mirror 18, and is reflected by the third total reflection mirror 2.
3 is reflected and transmitted through the blue liquid crystal panel 16 and the fourth dichroic mirror 22, and is reflected by the third dichroic mirror 21 to be taken out.

FIG. 10 schematically shows a projected image of the above liquid crystal projector. FIG. 10A is a diagram showing a positional relationship among the green liquid crystal panel 14, the red liquid crystal panel 15, and the blue liquid crystal panel 16 shown in FIG. 9, where 24 is a light incident side and 25 is a light emission side. The side, 26 is the upper part of the image, and 27 is the lower part of the image. As shown in FIG. 10B, in order to obtain an upright projected image 28 from the green liquid crystal panel 14, the red liquid crystal panel 15, and the blue liquid crystal panel 16,
The green liquid crystal panel 14 must scan from right to left, the red liquid crystal panel 15 must scan from bottom to top, and the blue liquid crystal panel 16 must scan from right to left. I won't. That is, as shown in FIG. 10C, the green liquid crystal panel 14 and the blue liquid crystal panel 1
In FIG. 6, scanning may be performed from top to bottom, but in the red liquid crystal panel 15, an upright projection image 28 cannot be obtained unless scanning is performed from bottom to top.

In the liquid crystal panels shown in FIGS. 5 and 6, in order to display the display image upside down, the scanning signal wirings G _{(1) to} G _(X) are moved from the bottom to the top of FIG. 5, that is, G _{(X )}
To scan in the G ₍₁₎ direction.

To scan from the bottom to the top of FIG. 5, scanning signals V _{G (0) to} V _{G (X)} are transferred from V _{G (X)} to V _G , as shown in FIG.
Scanning may be sequentially performed so that the switching transistor 8 is turned on toward _{G (0)} .

However, as shown in FIG. 12, at time t ₂
In, the applied voltage _{VP (m, n)} of the liquid crystal decreases by ΔV, but since the compensation voltage is not applied thereafter, finally, the voltage decreased by ΔV is continuously applied to the liquid crystal. That is, since the above compensation does not work, the application of the effective DC voltage component to the liquid crystal material is not compensated, and as a result, there occurs a problem that flicker or image sticking occurs immediately after displaying a fixed image. .

[0011]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems of the prior art, and is characterized in that a liquid crystal material is sealed between a plurality of pixel electrodes and a counter electrode. Then, a switching transistor is connected to each of the plurality of pixel electrodes, and a scanning signal for turning on / off the switching transistor is supplied from the scanning signal supply circuit to the switching transistor via a scanning signal wiring to form an image signal. In a method of driving a liquid crystal display device, which supplies a signal from a signal supply circuit to the pixel electrode via an image signal line and the switching transistor, and supplies a scanning signal of an adjacent scanning signal line to the pixel electrode via an additional capacitor. , A compensating voltage is provided on both sides before and after the voltage level for turning on the switching transistor of the scanning signal. Lies in the fact that pressure.

[0012]

With the above-described structure, the effective DC voltage component applied to the liquid crystal material is compensated not only when displaying a normal image on the same liquid crystal panel but also when displaying a vertically inverted image. Therefore, it is possible to realize a liquid crystal panel of good image quality without flicker and image burn-in. Further, even if the additional capacitance for holding the charge is formed between each pixel electrode and either side of the scanning signal wiring in the preceding stage or the succeeding stage, there is an effect of compensating for the DC voltage component. Further, since it is not necessary to prepare two types of panels, that is, a normal image display panel and a vertically inverted display panel, both panels can be displayed on a single panel, which simplifies the manufacturing process. .

[0013]

Embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Also in the method of driving the liquid crystal display device according to the present invention, the equivalent circuit of the liquid crystal panel and the equivalent circuit of one pixel are the same as those of the conventional one shown in FIGS. 5 and 6, so refer to FIGS. While explaining.

FIG. 1 shows voltage waveforms used in the driving method of the liquid crystal display device according to the present invention. FIG. 1 shows scanning signal lines G _{(1) to} G _(X) of FIG. 5 from top to bottom, that is, G _(1).
7 is a voltage waveform of each terminal in FIG. 6 when scanning is performed in the direction from G to ₍ G ₎ . Here, V _{B (n, m)} is the effective voltage ((V) applied to the liquid crystal material between the pixel electrode and the counter electrode connected to the n-th scanning signal line and the m-th image signal line via the switching transistor. a _{V P (n, m) -V} T).

From time t ₁ to time t ₂ , the scanning signal V
_{Since G (n)} is at a level V ₁ that turns on the switching transistor 8, a voltage of V _S ⁺ is applied to the pixel electrode 9 via the switching transistor 8, and V is applied to the liquid crystal.
_S ⁺ -V _TC is applied.

At time t ₂ , the voltage of the scanning signal V _{G (n)} changes from V ₁ to V ₃ , and this fluctuation causes parasitic capacitance C _GD between the gate and drain of the switching transistor 8.
The voltage applied to the pixel electrode 9 through the liquid crystal layer, and as a result, the voltage applied to the liquid crystal decreases by ΔV. This ΔV is represented by ΔV = C _GD · (V ₁ −V ₃ ) / (C _LC + C _S + C _GD ).

However, at time t ₃ , the scanning signal V _{G (n-1) of the} preceding stage changes from V ₃ to V ₂ , so that the change is caused via the additional capacitance C _S (11 in FIG. 5). The voltage applied to the pixel electrode 9 and, as a result, the voltage applied to the liquid crystal rises by ΔV ₁ . In addition, ΔV ₁ is represented by ΔV ₁ = C _S · (V ₂ −V ₃ ) / (C _LC + C _S + C _GD ).

At time t ₄ , the scanning signal V _{G (n)}
Changes from V ₃ to V ₂ , the change causes the parasitic capacitance C _GD between the gate and drain of the switching transistor 8.
The voltage applied to the pixel electrode 9 via the voltage rises by ΔV ₂ as a result. It should be noted that ΔV ₂ is represented by ΔV ₂ = C _GD · (V ₂ −V ₃ ) / (C _LC + C _S + C _GD ).

[0019] That is, by setting _{ΔV = ΔV 1 + ΔV 2 C} GD · (V 1 -V 2) = C S · (V 2 -V 3), the application of the effective DC voltage component to the liquid crystal material Will be compensated.

The same effect can be obtained at times t _{5 to} t ₈ .

Next, the case where the display image on the liquid crystal panel of FIG. 1 is vertically inverted will be described with reference to FIG. FIG. 2 is a voltage waveform of each terminal when the scanning signal wirings G _{(1) to} G _(X) in FIG. 5 are scanned from bottom to top, that is, from G _(X) to G ₍₁₎ direction. In FIG. 2, the n-th scanning signal V
_{G (n)} becomes V ₁ earlier than the _n− 1th scanning signal V _{G (n−1)} .

[0022] In FIG. 2, between time t ₁ of t _2, the switching transistor 8 is turned on, the liquid crystal V _S ⁺ -
V _TC is applied.

At time t ₂ , the voltage of the scanning signal V _{G (n)} changes from V ₁ to V ₃ , and this fluctuation causes the parasitic capacitance C _GD between the gate and drain of the switching transistor 8.
The voltage applied to the pixel electrode 9 via the liquid crystal and the voltage applied to the liquid crystal decreases by ΔV. This ΔV is represented by ΔV = C _GD · (V ₁ −V ₃ ) / (C _LC + C _S + C _GD ).

However, at time t ₃ , the scanning signal V
_{Since G (n)} changes from V ₃ to V ₂ , the change is applied to the pixel electrode 9 via the gate-drain parasitic capacitance C _GD of the switching transistor 8, and as a result, the voltage applied to the liquid crystal is , ΔV ₂ minutes increase. It should be noted that ΔV ₂ is represented by ΔV ₂ = C _GD · (V ₂ −V ₃ ) / (C _LC + C _S + C _GD ).

Further, at time t ₄ , the scanning signal V _{G (n-1) of the} preceding stage changes from V ₃ to V ₂ , so that the change is caused via the additional capacitance C _S (11 in FIG. 5). The voltage applied to the pixel electrode 9 and, as a result, applied to the liquid crystal increases by ΔV ₁ . In addition, ΔV ₁ is represented by ΔV ₁ = C _S · (V ₂ −V ₃ ) / (C _LC + C _S + C _GD ).

[0026] That _{is, ΔV = ΔV 1 + ΔV 2} C GD · (V 1 -V 2) = C With _{S · (V 2 -V 3)} , the effective DC voltage component of the voltage applied to the liquid crystal material Is compensated.

The same effect can be obtained at times t _{5 to} t ₈ .

Another embodiment is shown in FIGS. 3 and 4. Figure 3 is a scanning signal V _G constituted by the voltage of the four values of V ₁ ~V _4, V ₄ value or V ₂ value appears before and after the V ₁ value is configured to be alternately for each field, moreover the relationship V ₄ value and the V ₂ values appearing before and after the V ₁ value comes alternately, in the example was reversed in the preceding stage of the scanning signal V _{G (n-1)} and the main stage of the scanning signal V _{G (n)} is there. In FIG. 3, the scanning signal wirings G _{(1) to} G of FIG.
_(X) from top to bottom, that is, the voltage waveform of each terminal in the case of scanning from G ₍₁₎ to G _(X) direction.

From time t ₁ to time t ₂ , the scanning signal V
_{Since G (n)} is at the level V ₁ that turns on the switching transistor 8, the voltage of V _S ⁺ is applied to the pixel electrode 9 via the switching transistor 8.

At time t ₂ , the voltage of the scanning signal V _{G (n)} changes from V ₁ to V ₂ , and this fluctuation causes the parasitic capacitance C _GD between the gate and drain of the switching transistor 8.
The voltage applied to the pixel electrode 9 through the liquid crystal layer, and as a result, the voltage applied to the liquid crystal decreases by ΔV. The ΔV is represented by ΔV = C _GD · (V ₁ −V ₂ ) / (C _LC + C _S + C _GD ).

However, at time t ₃ , the scanning signal V _{G (n-1) of the} preceding stage changes from V ₄ to V ₃ , so that the change is via the additional capacitance C _S (11 in FIG. 5). The voltage applied to the pixel electrode 9 and consequently the voltage applied to the liquid crystal rises by ΔV ₃ . Note that ΔV ₃ is represented by ΔV ₃ = C _S · (V ₃ −V ₄ ) / (C _LC + C _S + C _GD ).

At time t ₄ , the scanning signal V _{G (n)}
Changes from V ₂ to V ₃ , the change causes the parasitic capacitance C _GD between the gate and drain of the switching transistor 8.
The voltage applied to the pixel electrode 9 via the liquid crystal and as a result, the voltage applied to the liquid crystal drops by ΔV ₄ . Incidentally, [Delta] V ₄ is represented by _{ΔV 4 = C GD · (V} 2 -V 3) / (C LC + C S + C GD).

Therefore, the voltage V finally applied to the liquid crystal is
_B ^{+ _{is, V B + = (V S}} + -V TC) -ΔV + ΔV 3 -ΔV 4 = (V S + -V TC) - (C GD · (V 1 -V 3) + C S · (V 3 - V ₄ )) / (C _LC + C _S + C _GD ), and the effective DC component voltage applied to the liquid crystal material is compensated.

[0034] Incidentally, similarly has the time t ₅ ~t _8, the voltage V _B applied to the liquid crystal after time t ₈ ^{- _{is, V B - = (V S}} - -V TC) - (C GD · ( _{V 1 -V 3) -C S ·} (V 2 -V 3)) / become _{(C LC + C S + C} GD). Here, when a _{C LC + C S + C GD} = C X, V B + = (V S + -V TC) - (C GD / C X) (V 1 -V
_{3) + (C S / C} X) (V 3 -V 4) V B - = (V S - -V TC) - (C GD / C X) (V 1 -V
₃₎ - a _{(C S / C X) (} V 2 -V 3).

Here, if the voltages V ₁ and V ₃ are fixed to a constant voltage, the positive voltage V of the voltage applied to the liquid crystal, respectively.
The level of _B ⁺ changes with V ₄ , and the level of the negative voltage V _B ⁻ changes with V _2.
A desired applied voltage can be obtained by arbitrarily setting the voltages of ₂ and V ₄ . As a result, the DC component of the voltage applied to the liquid crystal is removed, and the amplitude of the image signal (V _S ⁺ ~ V
_S ^-) it is possible to reduce.

FIG. 4 shows a case in which the display image on the liquid crystal panel of FIG. 3 is vertically inverted, and the scanning signal wiring G ₍₁₎ to G _{(1) of} FIG.
G _(X) is from bottom to top, that is, the voltage waveform of each terminal in the case of scanning from the G _(X) to G ₍₁₎ direction.

From time t ₁ to time t ₂ , the scanning signal V
_{Since G (n)} is the level V ₁ that turns on the switching transistor 8, the voltage of V _S ⁻ is applied to the pixel electrode 9 through the switching transistor 8.

At time t ₂ , the voltage of the scanning signal V _{G (n)} changes from V ₁ to V ₂ , and this fluctuation causes the parasitic capacitance C _GD between the gate and drain of the switching transistor 8.
The voltage applied to the pixel electrode 9 through the liquid crystal layer, and as a result, the voltage applied to the liquid crystal decreases by ΔV. The ΔV is represented by ΔV = C _GD · (V ₁ −V ₂ ) / (C _LC + C _S + C _GD ).

However, at time t ₃ , the scanning signal V
_{Since G (n)} changes from V ₂ to V ₃ , the fluctuation is applied to the pixel electrode 9 via the parasitic capacitance C _GD between the gate and drain of the switching transistor 8, and as a result, the voltage applied to the liquid crystal is , ΔV ₄ minutes. Incidentally, [Delta] V ₄ is represented by _{ΔV 4 = C GD · (V} 2 -V 3) / (C LC + C S + C GD).

Further, at time t ₄ , the scanning signal V _{G (n-1) of the} preceding stage changes from V ₄ to V ₃ , so that the change is via the additional capacitance C _S (11 in FIG. 5). The voltage applied to the pixel electrode 9 and consequently the voltage applied to the liquid crystal rises by ΔV ₃ . In addition, ΔV ₃ is represented by ΔV ₃ = C _S · (V ₃ −V ₄ ) / (C _LC + C _S + C _GD ).

Therefore, the voltage V finally applied to the liquid crystal is
_B ^{+ _{is, V B + = (V S}} + -V TC) -ΔV + ΔV 3 -ΔV 4 = (V S + -V TC) - (C GD · (V 1 -V 3) + C S · (V 3 - V ₄ )) / (C _LC + C _S + C _GD ), and the effective DC component voltage applied to the liquid crystal material is compensated.

[0042] Incidentally, similarly has the time t ₅ ~t _8, the voltage V _B applied to the liquid crystal after time t ₈ ^{- _{is, V B - = (V S}} - -V TC) - (C GD · ( _{V 1 -V 3) -C S ·} (V 2 -V 3)) / become _{(C LC + C S + C} GD). Here, when a _{C LC + C S + C GD} = C X, V B + = (V S + -V TC) - (C GD / C X) (V 1 -V
_{3) + (C S / C} X) (V 3 -V 4) V B - = (V S - -V TC) - (C GD / C X) (V 1 -V
₃₎ - a _{(C S / C X) (} V 2 -V 3).

Here, if the voltages V ₁ and V ₃ are fixed to a constant voltage, the positive voltage V of the voltage applied to the liquid crystal, respectively.
The level of _B ⁺ changes with V ₄ , and the level of the negative voltage V _B ⁻ changes with V _2.
A desired applied voltage can be obtained by arbitrarily setting the voltages of ₂ and V ₄ . As a result, the DC component of the voltage applied to the liquid crystal is removed, and the amplitude of the image signal (V _S ⁺ ~ V
_S ^-) it is possible to reduce.

[0044] In this manner, the scanning signal V _G constituted by the voltage of the four values of V ₁ ~V _4, configured to V ₄ values or V ₂ value appears before and after the V ₁ values come alternately every field In addition, the relationship in which the V ₄ value and the V ₂ value appearing before and after the V ₁ value alternate with each other is that the scanning signal V _{G (n)} of the preceding stage and the scanning signal V of the main stage are
_Even in the liquid crystal panel reversed by _{G (n)} , the scanning direction of V _G of the scanning signal can be reversed upside down, and as a result, the driving power of the liquid crystal panel can be reduced and the image quality can be improved.

[0045] In the above embodiment, the additional capacitance C _S showed a case that is formed between the pixel electrode 9 and the previous scan signal lines V _{G (n-1),} the additional capacitance C _S is the pixel Even when it is formed between the electrode 9 and the scanning signal wiring V _{G (n + 1)} (not shown) in the subsequent stage, the image can be inverted upside down.

[0046]

As described above, according to the driving method of the liquid crystal display device of the present invention, since the compensation voltage is applied before and after the voltage level at which the switching transistor of the scanning signal is turned on, the same compensation voltage is applied. Not only when displaying a normal image on the liquid crystal panel, but also when displaying a vertically inverted image, the effective DC voltage component applied to the liquid crystal material is compensated, and good image quality with no flicker or image burn-in LCD panel can be realized. Further, even if the additional capacitance for holding the charge is formed between each pixel electrode and either side of the scanning signal wiring in the preceding stage or the succeeding stage, there is an effect of compensating for the DC voltage component. Further, since it is not necessary to prepare two types of panels, that is, a normal image display panel and a vertically inverted display panel, both panels can be displayed on one panel, and the manufacturing process can be simplified.

[Brief description of drawings]

FIG. 1 is a voltage waveform diagram showing an embodiment of a driving method of a liquid crystal display device according to the present invention.

FIG. 2 is a voltage waveform diagram when the liquid crystal display panel is scanned in the reverse direction in the embodiment of the present invention.

FIG. 3 is a voltage waveform diagram showing another embodiment of the driving method of the liquid crystal display device according to the present invention.

FIG. 4 is a voltage waveform diagram when a liquid crystal panel is scanned in a reverse direction in another embodiment of the present invention.

FIG. 5 is an equivalent circuit diagram of a liquid crystal panel that implements a conventional method for driving a liquid crystal display device.

FIG. 6 is an equivalent circuit diagram of one pixel of a liquid crystal panel that implements a conventional method for driving a liquid crystal display device.

FIG. 7 is a diagram showing a scanning direction in a driving method of a conventional liquid crystal display device.

FIG. 8 is a voltage waveform diagram showing a driving method of a conventional liquid crystal display device.

FIG. 9 is a diagram showing a structure of a liquid crystal projector in which a method for driving a conventional liquid crystal display device is implemented.

FIG. 10 is a diagram showing a light path of a liquid crystal projector in which a conventional method for driving a liquid crystal display device is implemented.

FIG. 11 is a diagram showing an opposite scanning direction in a driving method of a conventional liquid crystal display device.

FIG. 12 is a diagram showing voltage waveforms when the scanning direction is reversed in the conventional method for driving a liquid crystal display device.

[Explanation of symbols]

1 ... Scan signal supply circuit, 2 ... Image signal supply circuit, 3 ... Counter electrode signal supply circuit, 4 ... Counter electrode wiring, 5 (G _{(1) to} G _(X) ) ... .Scanning signal line, 6 (S
_{(1) to} S _(Y) ) ... Image signal wiring, 7 ... Counter electrode wiring, 8 ... Switching transistor, 9 ... Pixel electrode, 10 ... Switching transistor gate-drain capacitance C _GD , 11 ... Additional capacity C _S , 12
... Liquid crystal material capacitance _CLC , VG _{(1) to} VG _(X) ... Scan signal, VS _{(1) to} VS _(Y) ... Image signal, VG _(n-1) ...
Scan signal applied to the (n-1) th scan signal line, V
_{G (n)} ... Scan signal applied to the n-th scan signal wiring, V _{S (m)} ... Image signal applied to the m-th image signal wiring, V _{G (n, m)} ...・ V _{B (n, m),} which is a signal voltage appearing in a pixel electrode connected to the n-th scanning signal wiring and the m-th image signal wiring through a switching transistor
An effective voltage (V applied to the liquid crystal material between the pixel electrode and the counter electrode, which is connected to the n-th scanning signal wiring and the m-th image signal wiring via the switching transistor,
_{P (n, m) -V T} ).

Claims (1)

[Claims] 1. A scanning signal supply circuit for enclosing a liquid crystal material between a plurality of pixel electrodes and a counter electrode, connecting switching transistors to the plurality of pixel electrodes, and turning on / off the switching transistors. From the image signal supply circuit to the pixel electrode through the image signal wiring and the switching transistor, and the scanning signal of the adjacent scanning signal wiring, In a method of driving a liquid crystal display device which supplies the pixel electrode through an additional capacitance, a compensating voltage is applied before and after a voltage level for turning on the switching transistor of the scanning signal. Driving method.