JPH11272237A - Liquid crystal display device, array substrate and driving method for array substrate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a liquid crystal display device capable of being miniaturized, requiring little power consumption and excellent in display quality by selecting a second voltage with a first voltage switching means only in a prescribed period, and selecting a third voltage with a second voltage switching means so that the voltages of signal lines become nearly intermediate voltages between first and fourth voltages. SOLUTION: Voltage selector switches SW2, SW3 for switching the voltages of a power supply line L1 and a grounding line L2 are provided on the outside of an array substrate 1. The voltage selector switch SW2 selects a power supply voltage Vd and the voltage selector switch SW3 selects the ground voltage Vs while a signal line drive circuit 4 displays the picture elements for one horizontal line. The voltage selector switches SW2, SW3 select intermediate voltages Vsig/c-Vth and Vsig/c+Vth respectively in a prescribed period after the display of the picture elements for one horizontal line is completed and before the display of the picture elements for the next horizontal line is started. No preliminary writing switch is required, power consumption is reduced, and the writing characteristic to a signal line can be improved.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a technique for driving an array substrate in which transistors are arranged for each pixel.

[0002]

2. Description of the Related Art When a voltage is always applied to a liquid crystal layer in the same direction, the arrangement of the liquid crystal is solidified and the movement of the liquid crystal is slowed down, resulting in a dark display. For this reason, frame inversion drive for switching the polarity of the voltage applied to the liquid crystal layer for each screen (frame), HV inversion drive for switching on a pixel-by-pixel basis as shown in FIG. 6, or for each horizontal line as shown in FIG. There has been proposed a liquid crystal display device employing an AC driving method such as switching H inversion driving.

In the AC driving method, the polarity of the voltage applied to the liquid crystal layer is switched for each predetermined pixel by inverting the voltage polarity of a data bus line for supplying pixel data at a constant cycle.

[0004]

By the way, a liquid crystal display device generally performs pixel display sequentially for each horizontal line, similarly to a CRT. After the display of one horizontal line is completed, there is a certain free time between the start of the display of the next horizontal line and this free time is also called a blanking period.

[0005] Even if a positive or negative signal voltage is supplied to the video bus line during the blanking period, the voltage is not supplied to the signal line, so that the display of the liquid crystal does not change. Therefore, the signal voltage supplied to the video bus line during the blanking period is only wasted, which causes an increase in power consumption.

Further, when the voltage polarity of the video bus line is switched, it takes a long time to reach a desired voltage because the voltage change width is large, which may cause problems such as an increase in power consumption and a decrease in luminance. is there.

The present invention has been made in view of the above points, and has as its object to reduce the size, consume less power, and excel in display quality of a liquid crystal display device, an array substrate, and the like.
And a method for driving an array substrate.

[0008]

In order to solve the above-mentioned problems, a first aspect of the present invention provides a plurality of scanning lines and signal lines arranged in a matrix and a scanning line for driving each of the scanning lines. An array substrate including a driving circuit, a signal line driving circuit for driving each of the signal lines, and a plurality of pixel display portions provided for different combinations of the scanning lines and the signal lines; and an array substrate facing the array substrate. And a second diode provided for each signal line in a liquid crystal display device having a counter substrate, wherein the array substrate and the counter substrate are disposed to face each other, and a liquid crystal material is sealed between the two substrates. First voltage switching means for selecting one of a first voltage and a second voltage lower than the first voltage; and a third voltage switching means lower than the first voltage. Voltage and this third voltage And a second voltage switching means for selecting one of a lower voltage and a fourth voltage, wherein an anode terminal of the first diode is connected to a corresponding signal line, and a cathode terminal of the first diode is connected to a corresponding signal line. A voltage selected by the first voltage switching means is supplied, a cathode terminal of the second diode is connected to a corresponding signal line, and an anode terminal of the second diode has a voltage selected by the second voltage switching means. Is supplied, and within a predetermined period during which the signal line drive circuit is not driving each signal line, the voltage of each signal line becomes the first voltage.
And the first voltage switching means selects the second voltage only for the predetermined period so that the voltage becomes substantially the intermediate voltage between the second voltage and the fourth voltage, and the second voltage switching means selects the second voltage only for the predetermined period. The third voltage is selected.

According to a seventh aspect of the present invention, a plurality of scanning lines and signal lines arranged in a matrix, a scanning line driving circuit for driving each of the scanning lines, and a signal line driving circuit for driving each of the signal lines are provided. An array substrate including a circuit, a plurality of pixel display units provided for different combinations of scanning lines and signal lines, and a first and a second diode provided for each signal line; Voltage and this first
First voltage switching means for selecting one of a second voltage lower than the first voltage, a third voltage lower than the first voltage, and a third voltage lower than the third voltage. And a second voltage switching means for selecting either one of a low voltage and a fourth voltage. An anode terminal of the first diode is connected to a corresponding signal line, and a cathode terminal of the first diode is connected to a corresponding signal line. The voltage selected by the first voltage switching means is supplied,
A cathode terminal of the second diode is connected to a corresponding signal line, a voltage selected by the second voltage switching means is supplied to an anode terminal of the second diode, and the signal line driving circuit drives each signal line. The first voltage switching means controls the second voltage only during the predetermined period so that the voltage of each signal line becomes a voltage substantially intermediate between the first and fourth voltages within a predetermined period during which the operation is not performed. In addition to selecting a voltage, the second voltage switching means selects the third voltage only during the predetermined period.

According to a thirteenth aspect of the present invention, there are provided a plurality of scanning lines and signal lines arranged in a matrix, a scanning line driving circuit for driving each of the scanning lines, and a signal line driving circuit for driving each of the signal lines. In a method for driving an array substrate including a circuit and a plurality of pixel display units provided for different combinations of scanning lines and signal lines, a first diode and a second diode are provided for each signal line. The anode terminal of the diode is connected to the corresponding signal line, the cathode terminal of the second diode is connected to the corresponding signal line, and at least while the signal line driving circuit is driving the signal line, Supplying a first voltage to the cathode terminal of the first diode, supplying a fourth voltage lower than the first voltage to the anode terminal of the second diode, During the predetermined period, the drive circuit does not drive each signal line, and during the predetermined period, the voltage of each signal line becomes substantially the intermediate voltage between the first and fourth voltages. A second voltage lower than the first voltage and higher than the fourth voltage is supplied to a cathode terminal of the first diode, and the fourth voltage lower than the first voltage is supplied to a cathode terminal of the second diode. A third voltage higher than the voltage is supplied.

The first to thirteenth aspects of the present invention will be described with reference to FIG. 2, for example. A "first diode" corresponds to a diode D1, a "second diode" corresponds to a diode D2,
The "first voltage switching means" includes a voltage switching switch SW2,
"Second voltage switching means" includes a voltage switching switch SW3,
The “first voltage” is the power supply voltage Vd, the “second voltage” is the intermediate voltage (Vsig / c−Vth), the “third voltage” is the intermediate voltage (Vsig / c + Vth), and the “second voltage” is the fourth voltage. Is the ground voltage V
s.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a liquid crystal display device and an array substrate according to the present invention will be specifically described with reference to the drawings.

[First Embodiment] FIG. 1 is a circuit diagram of a first embodiment of the liquid crystal display device according to the present invention. A portion surrounded by a dotted line in FIG. 1 is an array substrate 1 arranged to face a counter substrate (not shown). On an array substrate 1, a pixel array section 2 having signal lines and scanning lines arranged in a matrix, and a scanning line driving circuit 3 for supplying a scanning voltage to each scanning line
And a signal line driving circuit 4 for supplying a signal voltage to each signal line. Pixel TFTs 5 are arranged in rows near the intersections of the signal lines and the scanning lines, and a pixel electrode 6 is connected to one end of each pixel TFT 5.

The scanning line driving circuit 3 has a vertical shift register 7 for supplying a pulse signal to each scanning line with a time lag. The signal line drive circuit 4 includes the same number of transmission gates 8 as the number of signal lines, and a horizontal shift register 9 that supplies a pulse signal to each transmission gate 8.

The drain terminal of the transmission gate 8 has a video bus line LB for supplying pixel data.
Are connected, and the corresponding signal lines are connected to the source terminals.

Two diodes D1 and D2 are connected to one end of each signal line, respectively. The cathode terminal of one diode D1 is connected to the power supply line L1, the anode terminal thereof is connected to the corresponding signal line, and the other diode D2 is connected to the corresponding signal line.
Is connected to the ground line L2, and its cathode terminal is connected to the corresponding signal line.

The liquid crystal display of FIG. 1 is characterized in that a preliminary write switch SW1 is provided for each signal line. One end of each spare write switch SW1 is connected to the corresponding signal line, and the other end is connected to the intermediate voltage supply line L3. An intermediate voltage Vsig / c between the power supply voltage Vd and the ground voltage Vs is supplied to the intermediate voltage supply line L3.

The liquid crystal display device shown in FIG. 1 performs, for example, HV inversion driving for inverting the polarity of a signal voltage in pixel units. More specifically, all the preliminary write switches SW1 are turned on during a blanking period from when the scanning line driving circuit ends driving of one scanning line to when driving of the next scanning line starts. Thus, all the signal lines have the intermediate voltage Vsig / c during the blanking period.

As described above, by connecting the preliminary write switch SW1 to each signal line and turning on this switch during the blanking period, the voltage of each signal line becomes positive voltage, intermediate voltage, negative voltage. , The positive polarity voltage, and so on.

That is, by providing the preliminary write switch SW1, the voltage of the signal line changes from the intermediate voltage to the positive or negative voltage, so that the time required for the signal line to reach the desired voltage can be shortened. In addition, the characteristics of writing to the signal lines are improved. In the case of performing the HV inversion drive, a signal voltage of the opposite polarity is supplied to an adjacent signal line. However, if the preliminary write switch SW1 is provided, the voltages of all the signal lines become equal during the blanking period. ,
The power consumption of the entire device can be reduced.

[Second Embodiment] Recent liquid crystal display devices tend to have a high resolution. When the resolution increases, a blanking period between scanning line scanning periods also becomes short. In the case where the preliminary write switch SW1 is provided as in the first embodiment, the channel width of the transistor forming the preliminary write switch SW1 is adjusted so that each signal line has an intermediate voltage during the blanking period. It is necessary to make it larger than the channel width and to shorten the time required for switching. For this reason, it is difficult to reduce the size of the device of the first embodiment, and when the resolution is increased, the number of the preliminary write switches SW1 is increased, so that the preliminary write switches SW1 must be provided outside the array substrate 1.

In the second embodiment described below, each signal line can be temporarily set to an intermediate voltage without providing the preliminary write switch SW1.

FIG. 2 is a circuit diagram of a second embodiment of the liquid crystal display device. In FIG. 2, the same components as those in FIG. 1 are denoted by the same reference numerals, and different points will be mainly described below.

The configuration in the array substrate 1 is the same as that of FIG. 1 except that the spare write switch SW1 is not provided. Outside the array substrate 1, voltage switching switches SW2 and SW3 for switching the voltages of the power supply line L1 and the ground line L2 are provided. The voltage switch SW2 selects one of the power supply voltage Vd and the intermediate voltage Vsig / c (more precisely, Vsig / c-Vth, where Vth is the threshold voltage of the diode D1). , Ground voltage Vs and intermediate voltage Vsig / c (more precisely, Vsig / c
+ Vth).

While the signal line drive circuit 4 is performing pixel display for one horizontal line, the voltage switch SW2 selects the power supply voltage Vd and the voltage switch SW3 selects the ground voltage Vs. In addition, after a pixel display of one horizontal line is completed, the voltage change-over switches SW2 and SW3 are respectively set to the intermediate voltages (Vsig / c-Vth, Vsig / c + Vth).

FIG. 3 is an operation timing chart of the apparatus of FIG. 2. The operation of the apparatus of FIG. 2 will be described below with reference to FIG. In the following, an example in which the HV inversion drive for switching the polarity of the signal voltage in pixel units will be described.

The scanning line driving circuit 3 operates at times T1 to T in FIG.
During period 6, a scan pulse for scanning the scan line Gn is output. Between time T2 and T5 during this period, 1
Pixel display for a horizontal line is performed. Pixel display is performed in order of one pixel at a time. At time T3, the signal voltage (−
V1), and a signal voltage (+ V4) is supplied to the signal line S2 at time T4. Once a signal voltage is supplied to each signal line, the signal voltage is held until pixel display for one horizontal line is completed.

Until the scanning of the scanning line Gn is completed, the power supply voltage Vd is supplied to the power supply line L1 and the ground voltage Vs is supplied to the ground line L2. Therefore, during this period, the diode functions as a protection diode.

It should be noted that normally white (nomaly whit)
In the case of the e) type liquid crystal display device, the power supply voltage Vd is set to a voltage higher than the positive polarity voltage (+ Vmax) for black display, and the ground voltage Vs is set to the negative polarity voltage (-Vmax) for black display.
) Is set to a lower voltage. Thereby, all signal lines are electrically protected between the power supply voltage Vd and the ground voltage Vs.

At time T5, all the transmission gates 8 in FIG. 2 are turned off, and the video bus line LB is turned off.
The upper pixel data is not transmitted to each signal line.

Thereafter, at time T6, the scanning line Gn goes low, and the pixel TFT connected to the scanning line Gn
5 are all turned off. Next, between times T7 and T8, the voltage changeover switches SW2 and SW3 are switched, and the power supply line L1 and the ground line L2 each have an intermediate voltage. More precisely, assuming that the forward voltage of the diodes D1 and D2 is Vth, the voltage of the power supply line L1 is (Vsig / c-Vt
h), the voltage of the ground line L2 becomes (Vsig / c + Vth), whereby the voltages of all the signal lines become the intermediate voltage Vsi.
g / c.

As described above, between times T7 and T8, the diodes D1 and D2 function as the preliminary write switch SW1 for supplying the intermediate voltage Vsig / c to each signal line.

At time T8, the voltage switch SW
2 and SW3 are switched, and the power supply voltage V is applied to the power supply line L1.
d, and the ground voltage Vs is supplied to the ground line L2. As a result, the diodes D1 and D2 are restored to the protection diode D again.
1 and D2.

After time T9, the scanning period of the next scanning line Gn + 1 starts, and pixel display of one horizontal line is performed between times T10 and T13. For example, at time T11, the signal voltage (+ V2) is supplied to the signal line S1, and at time T12, the signal voltage (-V3) is supplied to the signal line S2.

As can be seen from FIG. 3, the voltage of the signal line S1 changes in the order of (-V1), the intermediate voltage Vsig / c, (+ V2), and the voltage of the signal line S2 becomes (+ V4), the intermediate voltage. Vsig / c, (−V3)...

As described above, in the second embodiment, the respective voltages of the power supply line L1 and the ground line L2 are set to the intermediate voltage within an arbitrary period, so that the preliminary write switch SW1 of FIG. 1 becomes unnecessary. Thus, the size of the liquid crystal display device can be reduced. In particular, since the driving circuit formed around the pixel array section 2 of the liquid crystal display device can be reduced in size, the frame of the liquid crystal display device can be reduced, and the actual screen size can be correspondingly increased. The spare write switch SW1 in FIG.
Since the transistor is formed using transistors, the number of transistors in the liquid crystal display device can be significantly reduced by configuring as in the second embodiment, a decrease in yield due to transistor failure or the like can be prevented, and a reduction in manufacturing cost can be achieved. I can do it.

[Third Embodiment] In a second embodiment, each signal line is set to an intermediate voltage during a blanking period between the driving of a certain scanning line and the driving of the next scanning line. However, there are cases where there is no blanking period or where the blanking period is so short that each signal line cannot be set to the intermediate voltage within that period. Therefore, in the third embodiment described below, each signal line is set to the intermediate voltage during the scanning line driving period.

The liquid crystal display device of the third embodiment has the same configuration as that of the second embodiment shown in FIG.

FIG. 4 is an operation timing chart of the third embodiment. FIG. 4 shows an example in which there is no blanking period between when a certain scanning line is driven and when the next scanning line is driven.

At time T6 in FIG. 4, the driving period of the scanning line Gn ends, and at the same time, the driving period of the scanning line Gn + 1 starts. Thereafter, from time T7 to time T8, the voltage switch S
W2 and SW3 are switched, and the voltage of the power supply line L1 becomes Vsi
At g / c-Vth, the voltage of the ground line L2 becomes Vsig / c + Vth. Thus, during this period, all the signal lines have the intermediate voltage Vsig / c.

After time T8, the voltage switch S
W2 and SW3 are switched, and the voltage of the power supply line L1 becomes Vd
Then, the voltage of the ground line L2 becomes Vs.

Thereafter, at time T9, the signal line drive circuit 4 starts driving the signal lines. For example, at time T10, the signal voltage (+ V2) is supplied to the signal line S1, and at time T11, the signal voltage (-V3) is supplied to the signal line S2.

As described above, in the third embodiment, the scan line driving circuit 3 starts driving a certain scanning line and then the signal line driving circuit 4 starts driving the signal line within an idle time. Since each signal line is set to the intermediate voltage Vsig / c, the signal line can be reliably set to the intermediate voltage Vsig / c even when there is no blanking period or when it is short. Therefore, as in the second embodiment, the spare write switch SW1 is not required, power consumption can be reduced, and characteristics of writing to the signal line can be improved.

[Fourth Embodiment] In a fourth embodiment, diodes D1 and D2 provided corresponding to each signal line are
It is connected to a different place from the second embodiment.

FIG. 5 is a circuit diagram of a fourth embodiment of the liquid crystal display device. In FIG. 5, the same components as those in FIG. 2 are denoted by the same reference numerals, and the following description will focus on the differences.

The device of FIG. 5 has the same configuration as that of FIG. 2 except that the connection points of the diodes D1 and D2 are different from those of FIG. Each of the diodes D1 and D2 is connected between the signal line driving circuit 4 and the pixel array unit 2. The diode D
1 and D2, a power line L1 and a ground line L2,
Are connected to voltage changeover switches SW2 and SW3, respectively.

By switching these voltage changeover switches SW2 and SW3, as in the second and third embodiments, while the signal line driving circuit 4 is not driving each signal line, each signal line is connected to the middle. Can be set to voltage.
Therefore, the fourth embodiment has the same effects as the second and third embodiments.

In the above-described embodiment, the HV inversion drive for switching the polarity of the voltage for each pixel has been described as an example. However, in this embodiment, various AC drive systems such as H inversion drive, V inversion drive, and frame inversion drive are used. Applicable to

As diodes D1 and D2 shown in FIG. 1 and the like, diodes D1 and D2 which are discrete parts may be used, but they may be constituted by transistors.

In FIG. 2 and the like, an example is described in which the voltage changeover switches SW2 and SW3 are provided outside the array substrate 1. However, the voltage changeover switches SW2 and SW3 may be provided inside the array substrate 1.

In the first to fourth embodiments, the liquid crystal display device is described as an example. However, the present invention can be applied to a single array substrate 1 before being bonded to a counter substrate. In this case, the voltage changeover switches SW2 and SW3 shown in FIG.

In the second embodiment, each signal line is supplied with the intermediate voltage V during the blanking period between the scanning periods of the scanning lines.
Although the example of setting to sig / c has been described, each signal line may be set to the intermediate voltage Vsig / c during a blanking period between one frame period.

[0053]

As described above in detail, according to the present invention, the first and second diodes are provided for each signal line, and the voltage supplied to one end of each of these diodes is switched so that the signal line drive is performed. Since the voltage of each signal line is set to the intermediate voltage within a predetermined period while the circuit is not driving each signal line, even if the polarity of the voltage of each signal line is periodically switched, the power consumption is reduced. Does not increase, and
Since the time required to change the polarity of the voltage can be shortened, the writing characteristics to the signal line are improved.

[Brief description of the drawings]

FIG. 1 is a circuit diagram of a first embodiment of a liquid crystal display device according to the present invention.

FIG. 2 is a circuit diagram of a second embodiment of the liquid crystal display device.

FIG. 3 is an operation timing chart of the device of FIG. 2;

FIG. 4 is an operation timing chart of the third embodiment.

FIG. 5 is a circuit diagram of a fourth embodiment of the liquid crystal display device.

FIG. 6 is a diagram illustrating frame inversion driving.

FIG. 7 is a diagram illustrating H-line inversion driving.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Array board 2 Pixel array part 3 Scan line drive circuit 4 Signal line drive circuit 5 Pixel TFT 6 Pixel electrode 7 Vertical shift register 8 Transmission gate 9 Horizontal shift register D1, D2 Diode SW1 Pre-write switch L1 Power supply line L2 Ground line

Claims (13)

[Claims] A plurality of scanning lines and signal lines arranged in a matrix; a scanning line driving circuit for driving each of the scanning lines; a signal line driving circuit for driving each of the signal lines; And an array substrate having a plurality of pixel display units provided for different combinations of signal lines, and a counter substrate disposed to face the array substrate, wherein the array substrate and the counter substrate are disposed to face each other. In a liquid crystal display device in which a liquid crystal material is sealed between both substrates, a first and a second diode provided for each signal line, a first voltage and a second voltage lower than the first voltage. First voltage switching means for selecting either one of the first voltage and the third voltage, and one of a third voltage lower than the first voltage and a fourth voltage lower than the third voltage Second voltage to select one Switching means, wherein an anode terminal of the first diode is connected to a corresponding signal line, and a voltage selected by the first voltage switching means is supplied to a cathode terminal thereof, and the second diode Is connected to a corresponding signal line, and the anode terminal thereof is supplied with a voltage selected by the second voltage switching means. The signal line drive circuit does not drive each signal line. Within a predetermined period, the voltage of each signal line is equal to the first and fourth voltages.
The first voltage switching means selects the second voltage only during the predetermined period so that the voltage becomes substantially the middle voltage of the third voltage, and the second voltage switching means selects the third voltage only during the predetermined period. A liquid crystal display device characterized by selecting a voltage. 2. The liquid crystal display device according to claim 1, wherein the signal line driving circuit inverts the polarity of a signal voltage supplied to each signal line at a predetermined cycle. 3. The method according to claim 1, wherein the first and second voltage switching means include a blanking period between a time when the scanning line driving circuit drives one scanning line and a time when the next scanning line is driven;
3. The liquid crystal display according to claim 1, wherein the predetermined period is set within at least one of a blanking period from the end of display of one screen to the start of display of the next screen. 4. apparatus. 4. The method according to claim 1, wherein the first and second voltage switching means are provided within a vacant time from when the scanning line driving circuit starts driving the scanning line to when the signal line driving circuit starts driving the signal line. 2. The method according to claim 1, wherein the predetermined time is set in a predetermined time period.
Or the liquid crystal display device according to 2. 5. The signal line driving circuit is connected to one end of each signal line, and the first and second diodes are connected to the other end of each signal line. 5. The liquid crystal display device according to any one of 4. 6. The liquid crystal display according to claim 1, wherein said first and second diodes are connected between said signal line drive circuit and said pixel display section. apparatus. 7. A plurality of scanning lines and signal lines arranged in a matrix, a scanning line driving circuit for driving each of the scanning lines, a signal line driving circuit for driving each of the signal lines, and a scanning line. And a plurality of pixel displays provided for different combinations of signal lines, a first diode and a second diode provided for each signal line, a first voltage, A first voltage switching unit for selecting one of a second voltage lower than the first voltage, a third voltage lower than the first voltage, and a third voltage lower than the first voltage.
And a second voltage switching means for selecting either one of a fourth voltage and a lower voltage than the voltage of the first diode. The anode terminal of the first diode is connected to the corresponding signal line, and the cathode of the first diode is connected to the corresponding signal line. A voltage selected by the first voltage switching means is supplied to a terminal, a cathode terminal of the second diode is connected to a corresponding signal line, and an anode terminal of the second diode is selected by the second voltage switching means. The supplied voltage is supplied, and within a predetermined period during which the signal line driving circuit is not driving each signal line, the voltage of each signal line becomes the first and fourth signals.
The first voltage switching means selects the second voltage only during the predetermined period so that the voltage becomes substantially the middle voltage of the third voltage, and the second voltage switching means selects the third voltage only during the predetermined period. An array substrate, wherein a voltage is selected. 8. The array substrate according to claim 7, wherein said signal line driving circuit inverts the polarity of a signal voltage supplied to each signal line at a predetermined cycle. 9. The apparatus according to claim 1, wherein the first and second voltage switching means include: a blanking period between the time when the scanning line driving circuit drives one scanning line and the time when the next scanning line is driven;
9. The array substrate according to claim 7, wherein the predetermined period is set within at least one of a blanking period from the end of displaying a screen to the start of displaying a next screen. . 10. The first and second voltage switching means,
9. The method according to claim 7, wherein the predetermined time is set within an idle time from when the scanning line driving circuit starts driving the scanning line to when the signal line driving circuit starts driving the signal line. An array substrate according to item 1. 11. The signal line driving circuit is connected to one end of each signal line, and the first and second diodes are connected to the other end of each signal line. 1
0. The array substrate according to any one of 0. 12. The array substrate according to claim 7, wherein said first and second diodes are connected between said signal line driving circuit and said pixel display section. . 13. A plurality of scanning lines and signal lines arranged in a matrix, a scanning line driving circuit for driving each of the scanning lines, a signal line driving circuit for driving each of the signal lines, and a scanning line. And a plurality of pixel display units provided for different combinations of signal lines, wherein a first diode and a second diode are provided for each signal line, and an anode terminal of the first diode is provided. A cathode terminal of the first diode is connected to a corresponding signal line, a cathode terminal of the second diode is connected to a corresponding signal line, and at least while the signal line driving circuit is driving the signal line. Terminal first
And supplying a fourth voltage lower than the first voltage to the anode terminal of the second diode, for a predetermined period during which the signal line drive circuit does not drive each signal line. The voltage of each signal line is within the first and fourth
And supplying a second voltage lower than the first voltage and higher than the fourth voltage to the cathode terminal of the first diode during the predetermined period so that the voltage becomes a substantially intermediate voltage between the first voltage and the second voltage. A method of driving an array substrate, comprising supplying a third voltage lower than the first voltage and higher than the fourth voltage to a cathode terminal of a second diode.