JPH11153777A - Method of adjusting drive voltage of liquid crystal display device, driving of liquid crystal display panel, liquid crystal display device, drive voltage adjusting device of liquid crystal display device, and electronic equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of adjusting a drive voltage of a liquid crystal display device wherein a DC component of a voltage impressed on a liquid crystal layer can be made to almost zero by a simple adjusting method, even when an electrical charge and discharge drive method is used as a driving method of a liquid-crystal display panel using two terminal type nonlinear element of a MIM drive element, etc. SOLUTION: When a test signal is inputted, a display screen of a liquid- crystal display panel 10 is split into halves, and a scanning signal is composed of the charge mode signal in the upper half, while the scanning signal is composed of the discharge mode signal in the lower half. And, in the center part of the display screen, a difference of the brightness between both regions is measured with a luminance meter, and Drive voltages V1 and V2 are adjusted so that the difference of the brightness between both regions may disappear according to the measurement result.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a driving device for a liquid crystal display panel, a liquid crystal display device and an electronic apparatus, and in particular, a two-terminal having bidirectional diode characteristics such as a MIM (Metal Insulator Metal) driving element. Voltage Adjustment Method for Active Matrix Drive Type Liquid Crystal Display Device Using Type Nonlinear Element, Drive Device for Liquid Crystal Display Panel, Liquid Crystal Display Device (Liquid Crystal Display Module), Drive Voltage Adjustment Device for Liquid Crystal Display Device, and Technology of Electronic Equipment Belongs to the field.

[0002]

2. Description of the Related Art Conventionally, as a liquid crystal display panel of an active matrix drive system, a TFT (thin film transistor) is used.
In addition to those using a driving element, there are also those using a two-terminal nonlinear element having bidirectional diode characteristics, such as an MIM driving element. Since the MIM driving element has a steep threshold value, it is advantageous in that there is less problem of crosstalk between pixels as compared with the conventional simple matrix driving method. Is advantageous in that it is relatively simple.

FIG. 30 shows a liquid crystal display panel using an MIM driving element as the two-terminal type nonlinear element. As shown in FIG. 30, this liquid crystal display panel has a plurality of data signal lines (..., Xi-1, Xi, Xi + 1...) And a scanning signal line arranged on a pair of substrates so as to form a matrix. At the intersection of (..., Yj-1, Yj, Yj + 1 ...)
The liquid crystal layer and the layer of the MIM driving element are connected in series to form one pixel region. A scanning signal driving circuit 81 is connected to each scanning signal line, and a data signal driving circuit 82 is connected to each data signal line. The scanning signal driving circuit 81 supplies a scanning signal to each scanning signal line. And a data signal is supplied from the data signal drive circuit 82 to each data signal line. Therefore, in each pixel region, if the potential difference generated between the scanning signal and the data signal is set to have a magnitude relationship with the threshold voltage of the MIM driving element, the MIM
The driving element can be turned on and off. MIM
When the driving element is turned on, the liquid crystal layer connected to the MIM driving element is charged, and the pixel region is turned on. After charging for a predetermined period, the MIM
When the driving element is turned off, the MIM driving element enters a high impedance state, and furthermore, since the resistance of the liquid crystal layer is set to a sufficiently large value, the accumulation of charges in the liquid crystal layer is maintained and the on state of the pixel region is maintained. Is maintained.
As described above, a period in which a specific pixel region is selected and the liquid crystal layer in the pixel region is charged (hereinafter, referred to as a selection period).
May be a part of the period in which the pixel region is kept in the ON state. Therefore, the selection period can be provided in a time-division manner for each scanning signal line, and a plurality of scanning signal lines and data signal lines are provided. Matrix driving common to pixel regions is possible.

A typical example of such a driving method is a driving method called a quaternary driving method. This 4
The value driving method uses a binary scanning signal and a binary data signal, and sets the polarity of the scanning signal and the data signal to, for example, 1
Inversion is performed every horizontal scanning period, and further, each of the scanning signal lines is inverted every vertical scanning period. This can be realized with a relatively simple circuit configuration.

However, the liquid crystal display panel using the MIM driving element has a configuration in which the MIM driving element and the liquid crystal layer are connected in series in each pixel region as described above. Is dependent on the voltage applied to the MIM drive element at that time. The voltage applied to the MIM driving element at that time, that is, the voltage applied to the MIM driving element when the charging of the liquid crystal layer is almost stopped depends on the current-voltage characteristic of the MIM driving element. An error occurs for each element. Therefore, simply inverting the polarity of the scanning signal and the data signal every one vertical scanning period as in the quaternary driving method simply inverts the polarity of the voltage applied to the liquid crystal layer. Are not offset. As a result, there is a problem that the error occurs between the pixel regions, and the voltage applied to the liquid crystal layer in each pixel region varies, causing display unevenness or the like.

Therefore, a driving method called a charging / discharging method has been proposed as a driving method capable of improving display characteristics more than the four-value driving method. This driving method is shown in FIG.
As shown in (C), the scanning signal is configured to be driven in two modes of a charging mode and a discharging mode,
In the charging mode, the selection voltage VS1 is supplied to the scanning signal line, and the liquid crystal layer is charged according to the data signal. On the other hand, in the discharge mode, the liquid crystal layer is overcharged irrespective of the data signal by supplying -VPRE which is a precharge voltage having a polarity opposite to that of the VS1. Then, the liquid crystal layer is discharged by supplying a selection voltage VS2 having a polarity opposite to that of -VPRE. Therefore, during the period in which the selection voltage VS2 is supplied, if the discharge amount is controlled by the data signal, the display state of the pixel region can be controlled.

For example, as shown in FIG. 31A, a data signal having values of VH / 2 and -VH / 2 is applied to a data signal line Xi for one horizontal scanning period (1H in FIG. 31A).
31B, and assuming that a scanning signal having the above-described selection potential is supplied to the scanning signal line Yj as shown in FIG. 31B, the data signal line Xi and the scanning signal In the pixel region at the intersection of the lines Yj, the voltage VB1 applied to the liquid crystal layer immediately after the end of the selection period of the charging mode is given by the following equation.

VB1 = (VS1 + VH / 2−VON) −K · (VS1−VH / 2) (1) where K in the above equation is the capacitance of the MIM driving element.
M, when the capacitance of the liquid crystal layer is CL, CM / (CM + C
K) (VS1-VH / 2)
Represents the shift of the liquid crystal layer voltage caused by capacitive coupling at the moment when the MIM driving element is turned off. Also, VO
N is a voltage applied to the MIM driving element when the charging of the liquid crystal layer is almost stopped.

In the discharge mode, after overcharging with the precharge voltage -VPRE, the charged charge is discharged by the selection voltage VS2, and the voltage applied to the liquid crystal layer immediately before the end of the selection period is VS2- VH / 2-VON
Becomes Therefore, the voltage VB2 applied to the liquid crystal layer immediately after the end of the selection period is expressed by the following equation.

VB2 = (VS2−VH / 2−VON) −K · (VS2−VH / 2) = − {(VON−VS2 + VH / 2) + K · (VS2−VH / 2)} (2) , K · (VS2−VH / 2) represents the shift of the liquid crystal layer voltage caused by capacitive coupling at the moment when the MIM driving element is turned off, as in the case of the charging mode.

As is apparent from the above equations (1) and (2),
When the voltage VON applied to the MIM drive element increases by ΔVON when charging of the liquid crystal layer is almost stopped, VB
The absolute value of 1 decreases by ΔVON, while the absolute value of VB2 increases by ΔVON. On the other hand, VON is ΔV
As the value decreases by ON, the absolute value of VB1 increases by ΔVON, but the absolute value of ΔVB2 decreases by ΔVON. Further, when an error ΔK occurs in K, if the absolute value of VB1 increases due to this error, the absolute value of VB2 decreases, and if the absolute value of VB1 decreases due to this error, V
The absolute value of B2 increases.

As described above, according to the charge / discharge driving method, M
Even if the VON of the IM drive element fluctuates, the voltage error generated in the liquid crystal applied voltage in the charge mode is effectively canceled by the voltage error generated in the liquid crystal applied voltage in the discharge mode. Therefore, it is possible to effectively prevent the occurrence of display unevenness due to the variation of the VON of the MIM drive element in the liquid crystal display panel.

[0013]

However, FIG.
In the driving method shown in FIG. 7, the absolute value of the voltage VB1 applied to the liquid crystal layer immediately after the end of the charge mode selection period, and the voltage VB1 applied to the liquid crystal layer immediately after the end of the discharge mode selection period.
If the absolute values of 2 are not set equal, there is a problem that a DC voltage is applied to the liquid crystal layer for a long time.

In order to make the absolute value of VB1 equal to the absolute value of VB2, it is necessary to satisfy the relational expression of VB1 + VB2 = 0 (3), and the above expressions (1), (2),
From (3), the relational expression of VS2 = −VS1−KVH + 2 · VON / (1−K) (4) is derived. Therefore, the selection voltage VS1 in the charging mode and the selection voltage VS2 in the discharging mode
Must be set to a value that satisfies the above equation (4).

However, VO included in the above equation (4)
N is a voltage applied to the MIM driving element when charging of the liquid crystal layer is almost stopped, and cannot be directly measured. Therefore, it is not easy to set the selection voltages VS1 and VS2 so as to satisfy the above equation (4).

Therefore, conventionally, the selection voltages VS1 and VS2 are set by the following method. First, only the drive in the charge mode is performed to measure the characteristics of the selection voltage VS1 and the transmittance at that time (referred to as VS1-T characteristics), and only the drive in the discharge mode is performed to determine the selection voltage VS2 and the transmittance. Characteristics (referred to as VS2-T characteristics) are measured. Then, VS1 giving a certain transmittance in the VS1-T characteristic measured first, and VS2 giving the transmittance in the VS2-T characteristic, are combined with a selection voltage VS in a charge / discharge driving method in which a charge mode and a discharge mode are mixed.
1, VS2. According to this method, the transmittance in the charging mode and the transmittance in the discharging mode can be made substantially equal, and the DC component of the voltage applied to the liquid crystal layer can be made almost zero.

However, in the above-mentioned conventional method, in order to accurately determine the selection voltage that gives the same transmittance in each mode, a considerable number of data samples are required when measuring the characteristics of the selection voltage and the transmittance. There is a problem that it takes a considerable amount of time to measure the characteristics alone.

Therefore, the present invention has been made in view of this problem. Even when a charge / discharge drive method is used as a drive method of a liquid crystal display panel using a two-terminal type nonlinear element such as an MIM drive element, With a simple adjustment method,
Driving voltage adjustment method for liquid crystal display device capable of making DC component of voltage applied to liquid crystal layer almost zero, driving device for liquid crystal display panel, liquid crystal display device, driving voltage adjustment device for liquid crystal display device, and electronic apparatus The challenge is to provide

[0019]

According to a first aspect of the present invention, there is provided a method for adjusting a driving voltage of a liquid crystal display device, comprising: a pair of substrates; a liquid crystal interposed between the pair of substrates; A plurality of data lines provided on the substrate, a plurality of scanning lines provided on the other substrate, a two-terminal nonlinear element and the liquid crystal connected in series between the data line and the scanning line. A liquid crystal display panel comprising a plurality of pixels comprising: a driving device for supplying a data signal and a scanning signal to the data lines and the scanning lines; and a power supply device for supplying a driving voltage to the driving device. A method for adjusting a drive voltage of a display device, comprising: a scan signal including only a charge mode having a first selection voltage value for causing a two-terminal nonlinear element to conduct to a scan line group corresponding to a first region of a display screen. Supplying a; and The two-terminal non-linear element is made conductive to a scanning line group corresponding to a second region other than the first region, and a precharge voltage having a polarity opposite to the first selection voltage with respect to an intermediate value of the data signal. Supplying a scan signal including a discharge mode continuously output to the precharge voltage and having a second selection voltage having a polarity opposite to the precharge voltage with respect to the intermediate value; and Supplying a data signal having the same gradation value to a data line in a region included in the first region and a data line in a region included in the second region; Measuring the luminance of each of the supplied regions, and adjusting the drive voltage to equalize the luminance of each of the regions according to the measurement result;
It is characterized by having.

According to the driving voltage adjusting method for a liquid crystal display device according to the first aspect, a scanning signal consisting of only a charging mode having a first selection voltage is applied to a scanning line group corresponding to a first region of a display screen. Is supplied, and when a data signal having a predetermined gradation value is supplied to a data line in at least a region included in the first region, a two-terminal type nonlinear element is generated due to a potential difference between the data signal and the scanning signal. Conducts,
The liquid crystal is charged.

A scanning line group corresponding to a second area other than the first area is provided with a precharge voltage having a polarity opposite to the first selection voltage with respect to an intermediate value of the data signal, When a scan signal including a mode signal that is output so as to be continuous with the precharge voltage and has a second selection voltage having a polarity opposite to the precharge voltage based on the intermediate value is supplied, Due to the charge voltage, the two-terminal type nonlinear element conducts regardless of the value of the data signal,
The liquid crystal is overcharged. Further, when a data signal having a predetermined gradation value is supplied to a data line in at least a region included in the second region, the potential difference between the data signal and a second selection voltage causes the two-terminal type. The non-linear element conducts and discharges the overcharged liquid crystal.

Therefore, when a data signal having the same gradation value is supplied to the data lines in the region included in the first region and the region included in the second region, the data signal is supplied. The difference in luminance between the regions is determined by the value of the first voltage charged to the liquid crystal by the potential difference between the first selection voltage in the charging mode and the data signal, and the value of the liquid crystal overcharged by the precharge voltage. This is a difference between the value of the second voltage of the liquid crystal as a result of discharging the charges by the potential difference between the second selection voltage and the data signal.

Therefore, the luminance of each area to which the data signal having the same gradation value is supplied is measured, and the driving voltage is adjusted so as to equalize the luminance of each area according to the measurement result. By adjusting, the difference between the value of the first voltage and the value of the second voltage can be made zero.

As described above, the DC voltage is applied to the liquid crystal for a long period of time by an extremely simple method of equalizing the brightness in each area of the display screen divided into the first area and the second area. It can be reliably prevented from being applied.

According to a second aspect of the present invention, there is provided a method of adjusting a driving voltage of a liquid crystal display device according to the first aspect of the present invention, wherein the scanning is performed in the second region. The step of supplying a signal is a step of supplying only a scan signal in a discharge mode having the precharge voltage and the second selection voltage.

According to the driving voltage adjusting method for a liquid crystal display device of the present invention, the same gradation value is applied to the data lines in the area included in the first area and the area included in the second area. Is supplied in the first area, the liquid crystal is charged by the potential difference between the first selection voltage in the charging mode and the data signal in the area to which the data signal is supplied. Is done. On the other hand, in a region included in the second region and supplied with the data signal, the charge of the liquid crystal overcharged by the precharge voltage is discharged by a potential difference between the second selection voltage and the data signal. The liquid crystal is charged to the voltage value resulting from the operation. Since the scanning signal supplied to the second area is only the scanning signal composed of the precharge voltage and the second selection voltage, the difference in luminance between the respective areas has the charging mode. In a normal display state in which a scanning signal and a scanning signal having a discharge mode composed of the precharge voltage and the second selection voltage signal are alternately supplied, the liquid crystal during a first selection voltage supply period of the charging mode And the difference between the charge voltage of the liquid crystal during the supply period of the precharge voltage and the second selection voltage. Therefore, the luminance of each area to which the data signal having the same gradation value is supplied is measured,
By making the brightness of each of the regions equal according to the measurement result, the difference between the charging voltages of the liquid crystal in the respective periods in the normal display state can be immediately reduced to zero.

According to a third aspect of the present invention, there is provided a driving voltage adjusting method for a liquid crystal display device according to the first aspect of the present invention, wherein the scanning is performed in the second region. The step of supplying a signal includes: a signal consisting of the charge mode; and a signal consisting of a discharge mode having the precharge voltage and the second selection voltage.
The method is characterized in that it is a step of supplying as a pair of scanning signals.

According to the driving voltage adjusting method for a liquid crystal display device according to the third aspect, the same gradation value is applied to the data lines in the area included in the first area and the area included in the second area. Is supplied in the first area, and in the area to which the data signal is supplied, the voltage value due to the potential difference between the first selection voltage in the charging mode and the data signal is supplied. The liquid crystal is charged. On the other hand, in a region included in the second region and supplied with the data signal, the charge of the liquid crystal overcharged by the precharge voltage is discharged by a potential difference between the second selection voltage and the data signal. The liquid crystal is charged to the voltage value resulting from the above operation, and the voltage value is changed to the voltage value due to the potential difference between the first selection voltage in the charging mode and the data signal in the second region and the region to which the data signal is supplied. The liquid crystal is charged. Therefore, in each of the regions, the voltage value due to the potential difference between the first selection voltage in the charging mode and the data signal is equal, and the difference in luminance in each of the regions is equal to the first selection voltage in the charging mode. The difference between the voltage value due to the potential difference from the data signal and the voltage value resulting from discharging the liquid crystal overcharged by the precharge voltage due to the potential difference between the second selection voltage and the data signal. Be equivalent. Therefore, by adjusting the luminance in each of the regions to be equal,
The difference between the charge voltages of the liquid crystal in the drive period in the charge mode and the drive period in the discharge mode in a normal display state can be made zero.

According to a fourth aspect of the present invention, there is provided a driving apparatus for a liquid crystal display panel, wherein a pair of substrates, a liquid crystal interposed between the pair of substrates, and a plurality of substrates provided on one of the substrates are provided. Data lines, a plurality of scanning lines provided on the other substrate, and a plurality of pixels including a two-terminal nonlinear element and the liquid crystal connected in series between the data lines and the scanning lines. A liquid crystal display panel driving device comprising:
A mode switching means for switching the drive mode between a normal drive mode and a voltage adjustment mode in accordance with an external input; and, when the drive mode switched by the mode switching means is a voltage adjustment mode, a first display on the display screen. A scan signal consisting only of a charge mode having a first selection voltage value for conducting the two-terminal nonlinear element is supplied to a scan line group corresponding to the region, and a scan signal is supplied to a second region other than the first region. The two-terminal type non-linear element is made conductive to a corresponding scanning line group, and a precharge voltage having a polarity opposite to the first selection voltage with respect to an intermediate value of the data signal is output, and the precharge voltage is output continuously to the precharge voltage. Scanning signal driving means for supplying a scanning signal including a discharge mode having a second selection voltage having a polarity opposite to the precharge voltage with reference to the intermediate value. Data signal driving means for supplying a data signal having the same gradation value to each of the data lines in the region included in the first region and the region included in the second region. I do.

According to the liquid crystal display panel driving device of the fourth aspect, when the driving mode is switched to the voltage adjustment mode in response to an external input by the mode switching unit, the scanning signal driving unit causes the display signal to be displayed on the display screen. A scanning signal consisting of only the charging mode having the first selection voltage is supplied to a scanning line group corresponding to the first area, and a predetermined gradation value is applied to at least data lines in an area included in the first area. When the data signal is supplied, the two-terminal non-linear element conducts due to the potential difference between the data signal and the scanning signal, and the liquid crystal is charged.

Further, a precharge voltage having a polarity opposite to the first selection voltage with respect to an intermediate value of the data signal is provided to a scanning line group corresponding to a second region other than the first region. When a scan signal including a mode signal that is output so as to be continuous with the precharge voltage and has a second selection voltage having a polarity opposite to the precharge voltage based on the intermediate value is supplied, Due to the charge voltage, the two-terminal type nonlinear element conducts regardless of the value of the data signal,
The liquid crystal is overcharged. Further, when a data signal having a predetermined gradation value is supplied to a data line in at least a region included in the second region, the potential difference between the data signal and a second selection voltage causes the two-terminal type. The non-linear element conducts and discharges the overcharged liquid crystal.

Therefore, when a data signal having the same gradation value is supplied to the data lines in the area included in the first area and the area included in the second area by the data signal driving means. The difference in luminance between the regions to which the data signal is supplied is determined by the first charge in the liquid crystal due to the potential difference between the first selection voltage in the charging mode and the data signal.
And the second voltage value of the liquid crystal as a result of discharging the charge of the liquid crystal overcharged by the precharge voltage by the potential difference between the second selection voltage and the data signal. Becomes

Therefore, the luminance of each area to which the data signal having the same gradation value is supplied is measured, and the driving voltage is adjusted so as to equalize the luminance of each area according to the measurement result. By adjusting, the difference between the value of the first voltage and the value of the second voltage can be made zero.

As described above, the display screen is divided into the first area and the second area.
Can be driven by scanning signals of different waveforms. Therefore, a DC voltage is applied to the liquid crystal for a long time by a very simple method of equalizing the luminance in each of the regions. Can be reliably prevented.

According to a fifth aspect of the present invention, there is provided a liquid crystal display panel driving apparatus according to the fourth aspect, wherein the precharge voltage is set in the second region. And supplying only a scanning signal in a discharge mode having the second selection voltage.

According to the driving device of the liquid crystal display panel of the present invention, the first data signal driving means is used to drive the first liquid crystal display panel.
When a data signal having the same gradation value is supplied to a data line in a region included in the region and a data line in a region included in the second region, the data signal is included in the first region and the data signal is included in the first region. In the supplied area, the liquid crystal is charged by the potential difference between the first selection voltage in the charging mode supplied by the scanning signal driving means and the data signal. On the other hand, in a region included in the second region and to which the data signal is supplied, the charge of the liquid crystal overcharged by the precharge voltage supplied from the scanning signal driving unit is also transferred to the scanning signal driving unit. The liquid crystal is charged to a voltage value resulting from discharging by a potential difference between the second selection voltage supplied from the means and the data signal. Since the scanning signal supplied to the second area is only the scanning signal composed of the precharge voltage and the second selection voltage, the difference in luminance between the respective areas has the charging mode. In a normal display state in which a scanning signal and a scanning signal having a discharge mode including the precharge voltage and the second selection voltage are alternately supplied,
The difference between the charge voltage of the liquid crystal during the first selection voltage supply period of the charge mode and the charge voltage of the liquid crystal during the supply period of the precharge voltage and the second selection voltage is equal to the difference. Therefore, by measuring the luminance of each region to which the data signal having the same gradation value is supplied, and by making the luminance of each region equal according to the measurement result,
Immediately, the difference between the charged voltages of the liquid crystal in the respective periods in the normal display state can be made zero.

According to a sixth aspect of the present invention, in the driving device for a liquid crystal display panel, the step of supplying a scanning signal in the second area includes the step of: A step of supplying a signal in a discharge mode having a voltage and the second selection voltage as a pair of scanning signals.

According to the liquid crystal display panel driving device of the present invention, the first data signal driving means controls the first signal.
When a data signal having the same gradation value is supplied to a data line in a region included in the region and a data line in a region included in the second region, the data signal is included in the first region and the data signal is included in the first region. In the supplied area, the liquid crystal is charged to a voltage value based on a potential difference between the first selection voltage in the charging mode supplied from the scanning signal driving means and the data signal. On the other hand, in a region included in the second region and to which the data signal is supplied, the charge of the liquid crystal overcharged by the precharge voltage supplied from the scanning signal driving unit is also transferred to the scanning signal driving unit. The liquid crystal is charged to a voltage value as a result of discharging by a potential difference between the second selection voltage supplied from the means and the data signal, and the data signal is supplied in the second region. The liquid crystal is charged to a voltage value based on a potential difference between the first selection voltage in the charging mode in the region and the data signal.
Therefore, in each of the regions, the voltage value due to the potential difference between the first selection voltage of the charging mode signal and the data signal is equal, and the difference in luminance in each of the regions is the first selection voltage of the charging mode. Between the voltage value due to the potential difference between the data signal and the data signal, and the voltage value resulting from discharging the charge of the liquid crystal overcharged by the precharge voltage due to the potential difference between the second selection voltage and the data signal. Is equivalent to Therefore, by adjusting the luminance in each of the regions to be equal, each of the drive period by the charge mode signal and the drive period by the first discharge mode signal and the second discharge mode signal in a normal display state is respectively performed. The difference between the charging voltages of the liquid crystal during the period can be made zero.

According to a seventh aspect of the present invention, there is provided a liquid crystal display panel driving apparatus as set forth in any one of the fourth to sixth aspects, wherein: The terminal type nonlinear element is a MIM (Metal In
(sulator Metal) drive element.

According to the driving device for a liquid crystal display panel of the present invention, the liquid crystal display panel particularly includes the MIM driving element. Since the screen is divided into a plurality of regions driven by different scanning signals, the driving period by the charge mode signal, the first and second discharge modes The charging voltage of the liquid crystal during the driving period by the signal can be equalized, and the application of the DC voltage to the liquid crystal can be reliably prevented. Therefore, a video signal can be displayed favorably over a long period of time.

According to an eighth aspect of the present invention, there is provided a liquid crystal display device comprising: a driving device for a liquid crystal display panel according to any one of the fourth to seventh aspects; And a power supply device for supplying a drive voltage to the drive device, wherein the power supply device is provided with means for adjusting the drive voltage.

According to the liquid crystal display device (liquid crystal display module) of the present invention, the liquid crystal display panel particularly has the two-terminal type nonlinear element. In, since the display screen is divided into a plurality of regions driven by different scanning signals, the driving period based on the charging mode signal, the first and the second driving periods are made in a very simple manner of equalizing the brightness of each region. The charge voltage of the liquid crystal during the driving period by the second discharge mode signal can be made equal, and the DC voltage with respect to the liquid crystal
Voltage application can be reliably prevented. Therefore, a video signal can be displayed favorably over a long period of time.

According to a ninth aspect of the present invention, there is provided a voltage adjusting device for a liquid crystal display device, wherein: a mounting table on which the liquid crystal display device according to the eighth aspect is mounted; Signal supply means for supplying a video signal accompanied by a synchronization signal to the device; mode switching signal output means for outputting a voltage adjustment mode switching signal to the driving device; and a display screen of a liquid crystal display device mounted on the mounting table. And a means for displaying the measured value of the luminance measuring means.

According to a ninth aspect of the present invention, a video signal accompanied by a synchronizing signal is supplied from a signal supply unit to the liquid crystal display device mounted on a mounting table. A signal for setting the drive mode to the voltage adjustment mode is supplied by the switching signal means. Thereby, the liquid crystal display device divides the display screen into a plurality of regions driven by different scanning signals. Then, the luminance of each area on the display screen is measured by the luminance measuring means,
The measured value is displayed on the display means. Therefore, the user adjusts the voltage on the basis of the display of the display means so as to equalize the brightness in each of the areas, thereby driving the charging mode signal and the first and second discharging mode signals. , The charging voltage of the liquid crystal during the driving period can be made equal, and the application of the DC voltage to the liquid crystal can be reliably prevented. Therefore, a video signal can be displayed favorably over a long period of time.

According to a tenth aspect of the present invention, there is provided an electronic apparatus including the liquid crystal display device according to the eighth aspect, in order to solve the above problem.

According to a tenth aspect of the present invention, the electronic device includes the above-described liquid crystal display device of the present invention. Since the charging voltage of the liquid crystal during the driving period by the first and second discharge mode signals can be equalized, the application of the DC voltage to the liquid crystal can be reliably prevented, and the video signal can be displayed well over a long period of time. it can.

[0047]

Embodiments of the present invention will be described below with reference to the drawings.

(MIM Driving Element) FIG. 1 schematically shows an MIM driving element as an example of a two-terminal nonlinear element provided in a liquid crystal display panel constituting a liquid crystal display device according to an embodiment of the present invention, together with a pixel electrode. 2 is a sectional view taken along the line AA in FIG. In FIG. 2,
In order to make each layer and each member a size recognizable in the drawings, the scale of each layer and each member is different.

In FIGS. 1 and 2, the MIM driving element 2
0 is an MIM array substrate 30 that constitutes an example of the first substrate
The first metal film 22 is formed on the insulating film 31 formed on the insulating film 31 in order from the insulating film 31 side.
It is composed of an insulating layer 24 and a second metal film 26 and has an MIM structure (Metal Insulator Metal structure). And
The first metal film 22 of the two-terminal MIM driving element 20 is connected as one terminal to the scanning line 12 formed on the MIM array substrate 30, and the second metal film 26 is connected to the pixel as the other terminal. It is connected to the electrode 34. Note that a data line (see FIG. 6) may be formed on the MIM array substrate 30 instead of the scanning line 12 and connected to the pixel electrode 34.

The MIM array substrate 30 is made of, for example, glass,
It is made of an insulating and transparent substrate such as plastic.

The underlying insulating film 31 is made of, for example, tantalum oxide. However, the main purpose of the insulating film 31 is to prevent the first metal film 22 from peeling off from the base and not to diffuse impurities from the base into the first metal film 22 by a heat treatment performed after the deposition of the second metal film 26 or the like. Is formed. Therefore, when the MIM array substrate 30 is made of a substrate having excellent heat resistance and purity, such as a quartz substrate, the insulating film 31 is omitted when separation or diffusion of impurities does not pose a problem. can do.

The first metal film 22 is made of a conductive metal thin film, for example, tantalum alone or a tantalum alloy. Alternatively, a tantalum simple substance or a tantalum alloy as a main component, and for example, an element belonging to Group 6, 7, or 8 in the periodic table such as tungsten, chromium, molybdenum, rhenium, yttrium, lanthanum, and dysprolium. It may be added. In this case, the element to be added is preferably tungsten, and its content is preferably, for example, 0.1 to 6 atomic%.

The insulating film 24 is, for example, an oxide film formed by anodic oxidation on the surface of the first metal film 22 in a chemical solution.

The second metal film 26 is made of a conductive metal thin film, for example, chromium alone or a chromium alloy.

The pixel electrode 34 is made of, for example, ITO (Indium).
It is made of a transparent conductive film such as a Tin Oxide) film.

As shown in the sectional view of FIG. 3, the above-mentioned second metal film and pixel electrode may be formed of a transparent conductive film 36 made of the same ITO film or the like. The MIM driving element 20 ′ having such a configuration has an advantage that the second metal film and the pixel electrode can be formed by the same manufacturing process at the time of manufacturing. In FIG. 3, the same components as those in FIG. 2 are denoted by the same reference numerals, and description thereof will be omitted.

FIG. 4 is a plan view and FIG.
As shown in the cross-sectional view, the MIM driving element 40 has a so-called back-to-back structure, that is, a first MIM driving element 40a and a second MIM driving element 40b are connected in series with opposite polarities. It may be configured to have a structure connected to 4 and 5, the same reference numerals are given to the same components as those in FIGS. 1 and 2, and the description thereof will be omitted.

In FIGS. 4 and 5, a first MIM driving element 40a is a first metal film made of tantalum or the like formed sequentially on an insulating film 31 formed on an MIM array substrate 30 as a base. 42, an insulating film 44 made of an anodic oxide film or the like and a second metal film 46a made of chromium or the like. On the other hand, the second MIM driving element 40b
With the insulating film 31 formed on the MIM array substrate 30 as a base, the second metal film 4 separated from the first metal film 42, the insulating film 44, and the first metal film 46a formed thereon in this order.
6b.

The second metal film 46a of the first MIM driving element 40a is connected to the scanning line 48, and the second metal film 46b of the second MIM driving element 40b is connected to the pixel electrode 45 made of an ITO film or the like. Have been. Therefore, the scanning signal is supplied from the scanning line 48 to the pixel electrode 45 via the first and second MIM driving elements 40a and 40b. Note that a data line (see FIG. 6) instead of the scanning line 48 may be formed on the MIM array substrate 30 and connected to the second metal film 46a of the first MIM driving element 40a.

In the example shown in FIGS. 4 and 5, the thickness of the insulating film 44 is smaller than that of the insulating film 24 in the example shown in FIGS. 1 and 2, and is set to, for example, about half. ing.

Although several examples of the MIM driving element as the two-terminal type nonlinear element have been described above, the MIM driving element has been described. The two-terminal non-linear element having diode characteristics can be applied to the active matrix driving type liquid crystal display panel of the present embodiment.

(Liquid Crystal Display Panel) Next, an embodiment of an active matrix driving type liquid crystal display panel using the above-described MIM drive element 20 will be described with reference to FIGS. 6 and 7. FIG. FIG. 6 is an equivalent circuit diagram showing the liquid crystal display panel in the present embodiment together with a driving circuit.
FIG. 7 is a partially broken perspective view schematically showing the liquid crystal display panel in the present embodiment.

In FIG. 6, the liquid crystal display panel 10
A plurality of scanning lines Y1 to Yi arranged on the IM array substrate 30 or its opposing substrate are connected to the scanning signal driving circuit 100, and a plurality of data lines X1 arranged on the MIM array substrate 30 or its opposing substrate. To Xj are connected to the data signal drive circuit 110. Further, a drive control circuit 120 that outputs data necessary for driving the liquid crystal display panel 10 by a charge / discharge drive method is connected to the scan signal drive circuit 100 and the data signal drive circuit 110. The scanning signal drive circuit 100, the data signal drive circuit 110, and the drive control circuit 120 are shown in FIGS.
May be formed on the MIM array substrate 30 shown in (1) or the counter substrate thereof. In this case, a liquid crystal display device (liquid crystal display module) including a driving circuit is provided. Or,
Scan signal drive circuit 100 and data signal drive circuit 110
In addition, the drive control circuit 120 is configured by an IC independent of the liquid crystal display panel, and passes scanning lines Y1 to Y1 through predetermined wiring.
It may be connected to Yi or the data lines X1 to Xj. In this case, the liquid crystal display device (liquid crystal display module) does not include a driving circuit.

In each pixel area 16, scanning lines Y1 to Y
i is connected to one terminal of the MIM drive element 20 (see FIG. 1), and the data lines X1 to Xj are connected to the MIM drive element 2 via the liquid crystal layer 18 and the pixel electrode 34 shown in FIG.
0 is connected to the other terminal. Therefore, when a scanning signal is supplied to the scanning lines Y1 to Yi corresponding to each pixel region 16 and a data signal is supplied to the data lines X1 to Xj,
The MIM drive element 20 in the pixel region is turned on, and a drive voltage is applied to the pixel electrode 34 and the liquid crystal layer 18 between the data lines X1 to Xj via the MIM drive element 20.

When the scanning signal drive circuit 100, the data signal drive circuit 110, and the drive control circuit 120 are provided on the MIM array substrate 30, the thin film forming process for the MIM drive element 20, the scan signal drive circuit 100, and the data signal drive circuit There is an advantage that the thin film forming process for the circuit 110 and the drive control circuit 120 can be performed simultaneously.
However, for example, an LSI including the scanning signal driving circuit 100 and the data signal driving circuit 110 mounted by a TAB (tape automated bonding) method via an anisotropic conductive film provided on a peripheral portion of the MIM array substrate 30. If the configuration in which the scanning lines Y1 to Yi and the data lines X1 to Xj are connected is adopted, the manufacture of the liquid crystal display panel 10 becomes easier. Also, a configuration is used in which the above-described LSI is connected to the scanning lines 12 and the data lines 14 using a COG (chip-on-glass) method in which the LSI is directly mounted on the MIM array substrate 30 and the opposing substrate via an anisotropic conductive film. Can also be taken.

In FIG. 7, the liquid crystal display panel 10
It includes an IM array substrate 30 and an opposing substrate 32 that is an example of a transparent second substrate that is disposed to oppose the IM array substrate 30.
The opposite substrate 32 is made of, for example, a glass substrate. The MIM array substrate 30 is provided with a plurality of transparent pixel electrodes 34 in a matrix. The plurality of pixel electrodes 34 extend along a predetermined X direction, and are connected to a plurality of scanning lines Y1 to Yi arranged in a Y direction orthogonal to the X direction. Pixel electrode 34, MIM drive element 20, scanning line Y
On the side facing the liquid crystal such as 1 to Yi, an alignment film made of an organic thin film such as a polyimide thin film and subjected to a predetermined alignment process such as a rubbing process is provided.

On the other hand, the opposing substrate 32 is provided with a plurality of data lines X1 to Xj each extending in the Y direction and arranged in a strip shape in the X direction. Data lines X1 to Xj
On the lower side, an alignment film made of an organic thin film such as a polyimide thin film and subjected to a predetermined alignment treatment such as a rubbing treatment is provided. In this case, the data lines X1 to Xj have at least a portion facing the pixel electrode
It is formed from a transparent conductive film such as an O film. However, the data line X
When the scanning lines Y1 to Yi are formed on the side of the counter substrate 32 instead of the scanning lines Y1 to Xj, the scanning lines Y1 to Yi are formed of a transparent conductive film such as an ITO film.

The opposite substrate 32 may be provided with a color filter composed of color material films arranged in, for example, a stripe, a mosaic, a triangle, or the like, depending on the use of the liquid crystal display panel 10. A black matrix such as resin black in which a metal material such as chromium or nickel or carbon or titanium is dispersed in a photoresist may be provided. With such a color filter and a black matrix, color display can be performed by one liquid crystal display panel, and high-quality images can be displayed by improving contrast and preventing color mixture of color materials.

The opposing substrate 32 is provided between the MIM array substrate 30 and the opposing substrate 32, which are configured as described above and in which the pixel electrodes 34 and the data lines X1 to Xj face each other.
Liquid crystal is sealed in a space surrounded by a sealant disposed along the periphery of the liquid crystal, and a liquid crystal layer 18 (see FIG. 6) is formed. The liquid crystal layer 18 includes a pixel electrode 34 and data lines X1 to X
In a state where no electric field from j is applied, a predetermined alignment state is taken by the above-mentioned alignment film. The liquid crystal layer 18 is made of, for example, a liquid crystal in which one or several kinds of nematic liquid crystals are mixed. The sealant is an adhesive for bonding the two substrates 30 and 32 around them, and contains a spacer for setting the distance between the two substrates to a predetermined value.

In FIG. 6, at the same time that the scanning signal driving circuit 100 sequentially sends a scanning signal of a predetermined voltage to the MIM driving element 20 in a pulsed manner, the data signal driving circuit 110 changes the gradation level of the display signal as described later. Are sequentially transmitted to the data line 14 having a pulse width corresponding to the pulse width. In FIG. 7, when a voltage is applied to the pixel electrode 34 and the data line 14 in this manner, the pixel electrode 34 and the data lines X1 to Xj
And the alignment state of the liquid crystal layer at the portion between
It changes according to the drive voltage applied via the drive element 20, and in the case of the normally white mode, the incident light cannot pass through the liquid crystal portion in the state where the drive voltage is applied. For example, incident light can pass through the liquid crystal portion in a state where a driving voltage is applied, and light having a contrast corresponding to a display signal is emitted from the liquid crystal display panel 10 as a whole.

Although not shown in FIGS. 1 to 7, for example, the side of the opposite substrate 32 on which the projected light is incident and the side of the MIM array substrate 30 on which the projected light is emitted are, for example, T
A polarizing film, a retardation film, or a polarizing plate according to an operation mode such as N (twisted nematic) mode, STN (super TN) mode, DSTN (double-STN) mode, and normally white mode / normally black mode Are arranged in a predetermined direction.

(First Embodiment of Driving Circuit) Next, the configuration and operation of the scanning signal driving circuit 100, the data signal driving circuit 110, and the driving control circuit 120 shown in FIG. This will be described with reference to the drawings.

First, the scanning signal driving circuit 100 constituting an example of the scanning signal driving means has a clock control circuit 101 as shown in FIG. The clock control circuit 101 is based on a scanning-side clock signal YCLK output from a drive control circuit 120 described later.
A shift clock YS for data shift as shown in FIG.
CL is generated, and the shift clock YSCL is supplied to the shift register 102 of the output voltage selection signal forming circuit 102.

The shift register 102 has an i-bit parallel output corresponding to the number of the scanning signal output terminals Y1 to Yi. The shift register 102 has three independent columns corresponding to the input data D0, D1 and D2. The configuration is provided. Accordingly, the shift register 102 outputs three bits for each scanning signal output terminal. The shift clock YSCL is supplied to each shift register constituting the shift register 102, and each of the shift registers captures data at the rising and falling timings of the shift clock YSCL, as shown in FIG. Shift the captured data one after another. The input data D0, D1, and D2 are output from the respective scanning signal output terminals Y1 to Yi.
For selecting the voltage of the scanning signal to be supplied to the scanning line from the, and is output as serial data from the driving control circuit 120 to the scanning signal driving circuit 100 described later.

Then, at a predetermined timing after each of the shift registers fetches i-bit data,
From the drive control circuit 120 to be described later to the scanning signal drive circuit 10
0, the latch strobe signal LS is supplied to the output voltage selection signal forming circuit 102.
Are provided to the latch 104. The latch 104 is provided with three columns of latches for taking in data of i bits in parallel. The parallel output data of 3 columns × i bits of the shift register 102 is output at the rising timing of the latch strobe signal LS. The configuration is such that latches for 3 columns × i bits are taken as they are.

Therefore, at the rising timing of the latch strobe signal LS, the output voltage selection signal forming circuit 102 outputs a 3-bit output voltage selection signal to each of the scanning signal output terminals Y1 to Yi. In other words, the output voltage selection signal is obtained by outputting the data D0, D1, and D2 serially output from the drive control circuit 120 in parallel for each of the scanning signal output terminals Y1 to Yi, and outputs the data D0, D1, and D2. Correspond to the output voltages V0 to V7 as shown in FIG.

On the other hand, V0 is supplied to the LCD driver 107 which supplies a scanning signal from each of the scanning signal output terminals Y1 to Yi.
To V7 are supplied from a power supply circuit described later, and V0 is supplied to each of the scanning signal output terminals Y1 to Yi.
To V7 are selected and output.

Therefore, the output voltage selection signal represented by 3 bits is decoded by the decoder 105 into a signal for selecting any one of the voltages V0 to V7, and the voltage value is shifted to the LCD drive system via the level shifter 106. By doing so, the LCD driver 107 outputs voltages having a magnitude relationship as shown in FIG. 11 for each of the scanning signal output terminals Y1 to Yi.

For example, as shown in FIG. 12, the output of the latch 104 corresponding to the scanning signal output terminals Y1 and Y2 is
DL10, DL corresponding to the data D0, D1, D2.
11, DL12 and DL20, DL21 and DL22, and DL10, DL11, DL12 and DL20, DL
21 and DL22 are respectively (0, 0, 0) at the rising timing t1 of the latch strobe signal LS.
And (0, 0, 1), in the period T1, the output voltage of the scanning signal output terminal Y1 becomes V4 and the output voltage of the scanning signal output terminal Y2 becomes V3. Similarly, at the rising timing t2 of the latch strobe signal LS, DL10, DL11, DL12 and D
When the values of L20, DL21 and DL22 are (1, 1,
Assuming that 1) and (0, 0, 1), during the period T2, the output voltage of the scanning signal output terminal Y1 becomes V2, and the output voltage of the scanning signal output terminal Y2 remains at V3.

As described above, the previous latch strobe signal L
Data D0, D1 corresponding to the voltage to be output from each scanning signal output terminal from the rising timing of S (timing t1 in FIG. 12) to the rising timing of the next latch strobe signal LS (timing t2 in FIG. 12). , D2 ((1,1,
1) and (0,0,1)) with the shift register 1 described above.
03, the output voltage of each scanning signal output terminal can be set to a desired value at the rising timing of each latch strobe signal LS.

Since the latch strobe signal LS is synchronized with one horizontal synchronizing signal and has a half cycle of the horizontal synchronizing signal, a selection voltage as shown in FIG. A scan signal having a waveform in the charge mode and a waveform in the discharge mode to be output can be supplied to a desired scan line.

Next, the configuration of the data signal drive circuit 110 will be described with reference to FIG. As shown in FIG. 13, in the data signal drive circuit 110, the shift register 11
1 for supplying a latch shift signal to the latch 112. The latch 112 is provided with j bits of an n-bit latch area for latching n-bit grayscale data corresponding to each of the data signal output terminals X1 to Xj. It is supplied for each latch area. Also, shift register 1
11, a data-side clock signal XCLK is supplied from a drive control circuit 120 described later, and the latch shift signal is supplied in synchronization with the clock signal XCLK.

The latch 112 is connected to a drive control circuit 1 described later.
20, the n-bit gradation data GD0 to GDn are supplied as serial data every n bits in the order corresponding to each data line, and the latch shift signal causes the latch 112 to be supplied every n bits. Latched by each latch area.

The gradation data latched by the latch 112 as described above is output in parallel to the DA converter 113 at the rising timing of a latch pulse signal LP supplied from the drive control circuit 120 described later.

The DA converter 113 converts each gradation data, which is digital data, into analog data.
Supplied to

The output circuit 114 is a circuit that performs pulse width modulation for each data signal output terminal based on the analog data, and outputs from each of the data signal output terminals X1 to Xj.
A data signal whose pulse width has been converted according to the gradation is supplied to each data line. Then, the latch 112
Is output in synchronization with a latch pulse signal output in synchronization with a horizontal synchronization signal, so that the data signal is supplied to a data line every horizontal scanning period. . However, as described above, in each of the charge mode and the discharge mode, the voltages (the voltages V1 and V2 in FIG. 12) that determine the display state of the liquid crystal are output during a half of one horizontal scanning period. Therefore, the data signal is set so as to be correspondingly output during a half of one horizontal scanning period.

Next, a drive control circuit 120 for supplying various signals to the above-described scan signal drive circuit 100 and data signal drive circuit 110 will be described with reference to FIG.

The drive control circuit 120 generates a clock signal and a timing signal to be supplied to each circuit based on synchronization signals such as a vertical synchronization signal and a horizontal synchronization signal separated from a composite signal and the like.
Wherein the clock signal and the timing signal are
The data is supplied to the A / D unit 124, the data output unit 123, and the driver control unit 122.

The A / D section 124 converts a video signal as analog data supplied separately from a composite signal or the like into digital data, and supplies the digital data to the data output section 123.

The data output unit 123 converts the digital data into gradation data GD0 to GDn, and converts the digital data into serial data at a predetermined timing based on the clock signal supplied from the basic timing generation unit 121. Supply to 110.

In the driver control unit 122 connected to the scanning signal driving circuit 100 and the data signal driving circuit 110, the clock signal YC
LK, the latch strobe signal LS, and the output voltage selection data D0 to D2 are supplied to the scanning signal driving circuit 100, and the clock signal XCLK and the latch pulse signal LP are supplied to the data signal driving circuit 110. Since each of these signals is generated based on the clock signal and the timing signal supplied from the basic timing generation unit 121 synchronized with the horizontal synchronization signal and the vertical synchronization signal, the scanning signal driving circuit 100 and the data signal driving circuit 110 The scanning signal and the data signal output from are also synchronized with the horizontal synchronizing signal and the vertical synchronizing signal.

Next, in the case where a power supply circuit for supplying voltages V0 to V7 and a circuit for outputting a video signal accompanied by a synchronization signal are connected to the liquid crystal display panel of the present embodiment configured as described above, FIG. 1 shows an example of the operation when displaying the image.
5 will be described.

FIG. 15A shows a data signal output terminal Xn.
FIG. 15 is a timing chart showing a data signal output from (<Xj). The data signal is supplied in the latter half of one horizontal scanning period H, as shown in FIG.

FIG. 15B shows a scanning signal output terminal Ym.
(<Yi) is a timing chart showing a scanning signal supplied to the scanning signal output terminal Ym +
3 is a timing chart showing a scanning signal supplied to the scanning signal No. 1; As shown in these figures, the scanning signal is set so as to alternately output the charge mode waveform and the discharge mode waveform every one horizontal scanning period H, and for one scanning line, one vertical scanning period TV. It is set so that the charge mode waveform and the discharge mode waveform are alternately output every time.

FIG. 15D shows a data line Xn and a scanning line Y.
MIM drive element 20 in the pixel area at the intersection with m + 1
5 is a timing chart showing a voltage applied to both ends of a liquid crystal layer 18 and a voltage V applied to the liquid crystal layer 18.
LC is indicated by oblique lines. In this example, in the overcharge period Tpre in the discharge mode, the voltage of V7-V3 is applied, so that the MIM drive element 20 is turned on, and the liquid crystal layer 18 is overcharged. Therefore, black is displayed in the normally white mode, and white is displayed in the normally black mode. And
In the subsequent discharge period Tdc, the voltage V2-V3 is applied, whereby the amount of discharge is suppressed, and the charged state of the liquid crystal layer 18 is maintained. As a result, black is displayed in the normally white mode and white is displayed in the normally black mode by the signal in the discharge mode.

Next, after one vertical scanning period TV,
Since the voltage V2-V3 in the charging period Tc is applied to the pixel area, charging of the liquid crystal layer 18 is suppressed, and black is displayed in the case of the normally white mode by the signal of the charging mode. In the case of the normally black mode, white is displayed.

Conversely, the discharge period Tdc in the discharge mode
, When the voltage of V2 + V3 is applied, a large amount of electric charges charged in the liquid crystal layer 18 are discharged during the overcharge period Tpre. In the case of the normally white mode, white is displayed, and in the normally black mode, In this case, black will be displayed. Further, when the voltage V1-V3 is applied during the charging period Tc in the charging mode,
The MIM drive element 20 is turned off, and the liquid crystal layer 18 is not charged. Therefore, white is displayed in the normally white mode, and black is displayed in the normally black mode.

In this embodiment, since such a charge / discharge driving method is used, VON which is a voltage applied to the MIM drive element when charging of the liquid crystal layer is almost stopped.
However, even if it fluctuates due to variations in the characteristics of the MIM drive element, the error voltage generated in the liquid crystal applied voltage in the charge mode is effectively offset by the error voltage generated in the liquid crystal applied voltage in the discharge mode. And the occurrence of display unevenness can be effectively prevented.

However, in such a charge / discharge driving method, the absolute value of the voltage applied to the liquid crystal layer immediately after the end of the charge mode selection period, and the absolute value of the voltage applied to the liquid crystal layer immediately after the end of the discharge mode selection period. If the absolute values of the voltages are not set equal, there is a problem that a DC voltage is applied to the liquid crystal layer for a long time.

In FIG. 15D, the voltage VB1 applied to the liquid crystal layer immediately after the end of the selection period of the charging mode is given by the following equation.

VB1 = (V1−V4−VON) −K · (V1−V4) (5) In the above equation, K represents the capacitance of the MIM driving element.
M, when the capacitance of the liquid crystal layer is CL, CM / (CM + C
In the capacitance ratio represented by L), K · V1 represents a shift of the liquid crystal layer voltage caused by capacitive coupling at the moment when the MIM driving element is turned off. In the discharge mode, after overcharging, the charged charge is discharged by the voltage V2-V3, and the voltage applied to the liquid crystal layer immediately before the end of the selection period is V
2-V3-VON. Therefore, the voltage VB2 applied to the liquid crystal layer immediately after the end of the selection period is expressed by the following equation.

VB2 = (V2−V3−VON) −K · (V2−V3) (6) Here, K · (V3−V2) indicates that the MIM driving element is in the off state as in the case of the charging mode. Represents the shift of the liquid crystal layer voltage caused by capacitive coupling at the moment

In order to make the absolute value of VB1 equal to the absolute value of VB2 as described above, it is necessary to satisfy the relational expression of VB1 + VB2 = 0 (7), and the above expressions (5), (6),
From (7), the relational expression of V2 = −V1 + 2 · VON / (1−K) (8) is derived. Therefore, it is necessary to set the selection voltage V1 in the charging mode and the selection voltage V2 in the discharging mode to values satisfying the above equation (8).

However, VO included in the above equation (8)
N is a voltage applied to the MIM driving element when charging of the liquid crystal layer is almost stopped, and cannot be directly measured. Therefore, it is not easy to set the selection voltages V1 and V2 so as to satisfy the above equation (8).

Therefore, in the present embodiment, when the voltage is adjusted, the upper half region of the liquid crystal display panel 10 shown in FIG.
Driving is performed only by the scanning signal based on the charge mode waveform shown in FIG. 16B, and the lower half area of the liquid crystal display panel 10 shown in FIG. It is driven by the scanning signal according to the above.
Then, as shown in FIG. 16A, an inspection area is provided at the boundary between the charging mode driving area and the discharging mode driving area, and the luminance difference between the charging mode driving area and the discharging mode driving area in the inspection area is measured by a luminance meter. The selection voltages V1 and V2 were adjusted so as to eliminate the difference in luminance.

For example, in the case of the normally white mode, black is displayed by charging the liquid crystal layer, but the upper half area in FIG. 16A is smaller than the lower half area. In the dark case, V1 is decreased to decrease the amount of charge of the liquid crystal layer in the charge mode to make the display brighter, and V2 is decreased.
When the amount of discharge after overcharge in the discharge mode is reduced and the display is darkened, the difference in luminance between the upper half area and the lower half area can be eliminated. The same applies to the case where the lightness and darkness in the two areas are reversed. That is, by adjusting the respective voltages so as to eliminate the difference in luminance between the two regions, the charge amount of the liquid crystal layer in the charge mode and the discharge mode can be made equal, and the DC component is applied to the liquid crystal layer. Can be prevented.

In the present embodiment, in order to enable such a drive at the time of voltage adjustment, a test signal is supplied to the driver control unit 122 as shown in FIG. An input terminal is provided, and when a test signal is input to this terminal, output voltage selection data D0 to D2 to be supplied from the driver control unit 122 to the scanning signal driving circuit 100 are appropriately set, and scanning different from the normal operation is performed. It was configured to output a signal.

Specifically, data D0 to D2 supplied to the scanning signal driving circuit 100 are supplied to the scanning lines in the upper half area of the screen for one horizontal scanning period as shown in DL10 to DL12 in FIG. At (0,0,0) to (1,
(0,0,1) and (0,0,1) like DL20 to DL22.
A pattern that changes from 1) to (1,1,0) and thereafter becomes (0,0,0) is set to be repeated every horizontal scanning period within one vertical scanning period.
In the next vertical scanning period, (0, 0, 1) to (1,
(0,0,0) and (0,0,0) like DL20 to DL22.
A pattern that changes from (0) to (1,1,1) and thereafter becomes (0,0,1) is set to be repeated every horizontal scanning period. With such a setting, in the upper half area of the screen, as in Y1 and Y2, the driving is performed by the scanning signal of the charge mode waveform of the voltages V1 and V6 in the selection period.

On the other hand, for the scanning lines in the lower half area of the screen, the data D0 to D2 supplied to the scanning signal drive circuit 100 are converted to DL (n-1) 0 to DL (n-1) 2.
Changes from (0,0,1) to (0,1,1) in one horizontal scanning period, and then (1,0,0)
From (0,0,0) to DLn0
Like (DLn2), (0,0,0) to (0,1,0)
And then (1, 0, 1) to (0,
The pattern changing to (0, 1) is set so as to be repeated every horizontal scanning period within one vertical scanning period. In the next vertical scanning period, DL (n-1) 0 to D (n-1)
Like (L (n-1) 2), during one horizontal scanning period, it changes from (0,0,0) to (0,1,0) and thereafter from (1,0,1) to (0,0, 1) and a pattern that changes from (0,0,1) to (0,1,1) and then changes from (0,0,1) to (0,0,0). , It is set to be repeated every horizontal scanning period. With such a setting, in the lower half area of the screen, the voltage V7 or V0 is selected in the overcharge period, and the voltage V2 or V5 is selected in the discharge mode, like Yn-1 and Yn. Driving is performed by the scanning signal having the charging mode waveform.

The driving in the test mode as described above is performed by inputting the above-described test signal to the drive control circuit 120. In the present embodiment, the input of the test signal is performed by an inspection apparatus as shown in FIG. , And confirmation of luminance and adjustment of voltage. In the example described below, as shown in FIG. 20, the liquid crystal display panel 10, the power supply circuit 130, the analog data output circuit 140, the synchronization signal output circuit 141, and the test signal output circuit 142 are provided. To constitute the liquid crystal display device 11,
A case where voltage adjustment is performed using the liquid crystal display device 11 will be described.

In FIG. 18, the liquid crystal display device 11 as described above is mounted on a checker 150. The liquid crystal display device 11 includes a power supply circuit 130 as shown in FIG. 20, an analog data output circuit 140, 141 for outputting a video signal and a synchronization signal, and a test signal output circuit 142 for outputting a test signal. The liquid crystal display device 1 includes a circuit for outputting a predetermined signal.
By setting a switch (not shown) to the ON state after setting 1, a predetermined signal is output to the test signal output circuit 142, and the above-described test mode in which the screen is divided is driven.

The checker 150 includes a tester 151 having a CCD 152 mounted thereon, and the tester 151 is set at the center of the liquid crystal display panel 10 mounted on the checker 150.
The tester 151 supplies only light in an inspection area on the screen of the liquid crystal display panel 10 to the CCD 152. The output of the CCD 152 is transmitted to the personal computer 154 via the cable 153, and the personal computer 154 calculates the luminance and the luminance difference of the inspection area. That is, in the personal computer 154, an application program for inspection can be executed, and the application program is started and the tester 151 is started.
Is performed on the screen 155a of the monitor 155 of the personal computer 154, a display as shown in FIG. 19 is performed.

An image showing the divided area of the liquid crystal display panel 10 and an image showing the inspection area are displayed on the screen 155a, and an area showing the luminance of the upper half area of the liquid crystal display panel 10 is displayed at the upper left of the screen. 160 and the liquid crystal display panel 10
An area 161 indicating the luminance of the lower half area, an area 162 indicating the luminance difference between the upper half area and the lower half area, and an area 163 displaying the voltage adjustment value are provided. Then, based on the output values from the CCD 152, respective luminances, luminance differences, and adjustment values are calculated and displayed in the respective areas.

Therefore, the examiner can appropriately adjust the voltage by turning the voltage adjustment knob (not shown) of the power supply circuit 130 while watching the display on the screen 155a.

This voltage adjusting knob is provided in the power supply circuit 130 shown in FIG. Power supply circuit 130
Is provided with a power supply 131 for generating voltages V0, V3, and V7, and an intermediate potential generating unit 132 for generating an intermediate potential among voltages V1, V2, V5, and V6 from these voltages. , V3, V5, V6, and V7 are supplied from the power supply circuit 130 to the scanning signal drive circuit 100. Further, the voltage V3 is supplied to the data signal driving circuit 110. Note that the voltage V4 is a ground voltage and is a voltage commonly used in all circuits.

The intermediate potential generating section 132 has a temperature sensing circuit 133, an OFF sequence circuit 134,
The D adjustment circuit 135 and the Vb adjustment circuit 136 are connected, and are configured to adjust the intermediate potential generated by the intermediate potential generation section 132 to an appropriate value.

As shown in FIG. 21, the voltage adjusting knob is connected to the variable resistor VR in the CD adjusting circuit 135.
1 is changed, and by changing this resistance value, the input voltage value of the amplifier 170 changes. Therefore, the value of the voltage V1 output from the amplifier 172 via the amplifier 171 and the amplifiers 173, 174 , The value of the voltage V2 output from the amplifier 175 changes. FIG.
As can be seen from the circuit No. 1, V1 and V2 increase and decrease in the same direction. That is, the voltage V2 increases as the voltage V1 increases, and the voltage V2 increases as the voltage V1 decreases.
Decrease. Although not shown, V6, V5
A similar circuit is provided for the voltage of
1, V2 is adjusted at the same time.

Note that the temperature sensing circuit 1 shown in FIG.
Reference numeral 33 denotes a circuit for compensating the temperature of the liquid crystal display panel 10, which detects the temperature of the liquid crystal display panel 10 and compensates the voltages V1 and V2 accordingly.

Further, when the power is turned off, the OFF sequence circuit 134 generates a sequence signal and outputs the signals V1 and V6.
Is a circuit for setting the value of VCNT to VCNT. This voltage of VCNT is also input to the drive control circuit 120, and the IC is operated for 10 to 20 ms after the power is turned off. By executing such an OFF sequence, the charges charged in the liquid crystal are completely discharged when the power is turned off.

The Vb adjustment circuit 136 is a circuit for adjusting the brightness of the liquid crystal display panel, and is similar to the brightness adjustment circuit provided in a normal liquid crystal display device. That is, V
When 1 is increased, V2 is decreased, and when V1 is decreased, V2 is increased.

By turning the voltage adjustment knob as described above, the values of V1 and V2 change and the value of the luminance displayed on the screen 155a changes. Adjustment is facilitated by displaying the adjustment value.

This adjustment value is obtained by setting the luminance of the upper half screen to W
1, when the brightness of the lower half screen is W2, adjustment value (%) = {W1 / ((W1 + W2) / 2) -1}
× 100 is calculated. According to this equation, for example, when the upper half is bright, the adjustment value is displayed positively, and when the upper half is dark, the adjustment value is displayed negatively. Therefore, the adjustment value may be adjusted so that the displayed value approaches zero. .

The size of the inspection area can be changed by operating a personal computer.

Further, in this test mode, a predetermined halftone raster signal is output to the analog data output circuit 140, and halftone raster data is output from the analog data output circuit 140. FIG. 22 shows a shift in luminance depending on each gradation. In FIG. 22, the X-axis is the output voltage value of the Vb adjustment circuit. The Y axis is the luminance. FIG.
As can be seen from FIG. 2, the transmittance of the liquid crystal display panel increases as the voltage value decreases, and the transmittance decreases as the voltage value increases.

This data is different from the data to which each gradation data is input. However, it is the same that the balance of the luminance in the charge mode drive area and the luminance in the discharge mode drive area is lost with the change of the transmittance. It is.

As described above, when the voltage is adjusted in the halftone, the balance of the luminance is lost as the gray level rises and falls. Since the brightness at the time of mode driving is switched, the voltage adjustment in the test mode described above needs to be performed in the halftone.

As described above, according to the present embodiment, the charge voltage of the liquid crystal in the charge mode period and the liquid crystal charge voltage in the discharge mode period can be equalized by an extremely simple method of equalizing the brightness of the divided areas. . Therefore, the DC component applied to the liquid crystal layer can be removed to improve the quality of the liquid crystal display panel.

In the above-described embodiment, a case has been described in which the number of regions to be divided is two. However, the present invention is not limited to this, and may be divided into a larger number.

Further, the example in which the luminance inspection area is set at the center of the display screen has been described. However, the present invention is not limited to this, and each inspection area may be separated by a predetermined distance. However, by setting it at the center, the size of the screen reading unit can be reduced.

(Second Embodiment of Driving Circuit) Next, a second embodiment of the present invention will be described with reference to FIG. The same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

In the first embodiment described above, the driving in the charging mode is performed in the upper half of the screen, and the driving in the discharging mode is performed in the lower half of the screen. In the present embodiment, as shown in FIG. In addition, the upper half of the screen is driven by the charge mode, and the lower half of the screen is driven by the charge / discharge mode.

Since the selection voltage value during the overcharge period is determined by the withstand voltage of the liquid crystal display driver, it is uniquely determined. Therefore, the balance between the luminance in the charge mode drive and the luminance in the charge / discharge mode drive is equivalent to the balance between the voltage V1 in the charge period and the voltage V2 in the discharge period.

By employing such a driving method, the voltage V5, which is the discharge voltage when the discharge mode waveform is negative, becomes unnecessary, and the voltage level can be reduced by one. Therefore, the above-described power supply circuit 130 can be configured more easily.

In the present embodiment, the drive waveform by the charge / discharge drive method is not limited to the one shown in FIG. 23, and it is sufficient if at least the charge mode and the discharge mode are mixed. For example, as shown in FIG.
It is also possible to perform precharge of positive polarity or precharge with both positive and negative polarities as shown in FIG. These settings can be made by changing the supply timing of the output voltage selection data from the drive control circuit 120.

Further, gradation display may be performed by pulse height modulation or pulse width modulation of the data signal. In addition to the drive for inverting the polarity every one horizontal period, the drive for inverting the polarity every n horizontal periods may be used, and the frame inversion drive alone without performing the inversion drive every one horizontal period may be used. It is possible.

The liquid crystal display panel 10 described above
For example, when applied to a color liquid crystal projector, three liquid crystal display panels 10 are respectively used as light valves for RGB, and each panel is provided with each color separated through a dichroic mirror for RGB color separation. Is incident as incident light, so that it is not necessary to provide a color filter on the counter substrate 32. On the other hand,
When the liquid crystal display panel 10 is applied to, for example, a direct-view or reflection-type color liquid crystal television, an RGB color filter is formed on a counter substrate 32 together with a protective film thereof in a predetermined region facing the pixel electrode 34. You may.

In the liquid crystal display panel 10, the pixel electrodes 34, the MIM driving elements 20, the scanning lines 12
A flattening film may be applied on the entire surface by spin coating or the like, or may be subjected to a CMP process.

Further, in the liquid crystal display panel 10, the liquid crystal layer 18 is composed of a nematic liquid crystal as an example. However, if a polymer dispersed liquid crystal in which the liquid crystal is dispersed as fine particles in a polymer is used, the above-described alignment film is formed. In addition, a polarizing film, a polarizing plate, and the like are not required, and an advantage of higher luminance and lower power consumption of the liquid crystal display panel due to an increase in light use efficiency can be obtained. Furthermore, when the liquid crystal display panel 10 is applied to a reflection type liquid crystal display device by forming the pixel electrode 34 from a metal film having a high reflectivity such as Al, the liquid crystal molecules are almost vertically aligned without applying a voltage. Alternatively, a SH (super homeotropic) type liquid crystal may be used. Furthermore, in the liquid crystal display panel 10, the data line 1 is placed on the side of the counter substrate 32 so as to apply a vertical electric field (vertical electric field) to the liquid crystal layer.
4, a pair of electrodes for generating a horizontal electric field is applied to the pixel electrode 3 so as to apply a parallel electric field (lateral electric field) to the liquid crystal layer.
4 (that is, without providing a vertical electric field generating electrode on the side of the counter substrate 32, the MIM array substrate 30).
Is provided with an electrode for generating a lateral electric field). The use of the horizontal electric field is advantageous in widening the viewing angle as compared with the case of using the vertical electric field. In addition, the present embodiment can be applied to various liquid crystal materials (liquid crystal phases), operation modes, liquid crystal alignment, a driving method, and the like.

(Electronic Apparatus) Next, an embodiment of an electronic apparatus including the liquid crystal display panel 10, the scanning signal drive circuit 100, and the data signal drive circuit 110 described in detail above will be described with reference to FIGS. explain.

First, FIG. 25 shows a schematic configuration of an electronic apparatus including the liquid crystal display panel 10 and the like as described above.

In FIG. 25, the electronic apparatus includes a display information output source 1000, a display information processing circuit 1002, a driving circuit 1004 including the above-described scanning signal driving circuit 100 and data signal driving circuit 110, the above-described liquid crystal display panel 10, and a clock. It comprises a generating circuit 1008 and a power supply circuit 1010. The display information output source 1000 is a ROM
(Read Only Memory), RAM (Random Access Me)
mory), a memory such as an optical disk device, a tuning circuit, and the like, and outputs display information such as a video signal of a predetermined format to the display information processing circuit 1002 based on a clock from the clock generation circuit 1008. The display information processing circuit 1002 includes well-known various processing circuits such as an amplification / polarity inversion circuit, a phase expansion circuit, a rotation circuit, a gamma correction circuit, and a clamp circuit, and includes display information input based on a clock. , And sequentially generates the aforementioned 6-bit digital signal DATA (D0 to D5) of 64 gradations, and outputs it to the drive circuit 1004 together with the clock CLK. The driving circuit 1004 drives the liquid crystal display panel 10 with the scanning signal driving circuit 100 and the data signal driving circuit 110 according to the driving method described above. The power supply circuit 1010 supplies a predetermined power to each of the above-described circuits. The driving circuit 1004 may be mounted on the MIM array substrate constituting the liquid crystal display panel 10, and in addition to this, the display information processing circuit 1002
May be mounted.

Next, FIG. 26 and FIG. 27 show specific examples of the electronic apparatus configured as described above.

In FIG. 26, a liquid crystal projector 1100, which is an example of electronic equipment, prepares three liquid crystal display modules including a liquid crystal display panel 10 in which the above-described drive circuit 1004 is mounted on an MIM array substrate, and each of them has an RGB component. The projector is configured as a projection type projector used as the light valves 1110R, 1110G and 1110B.
In the liquid crystal projector 1100, when the projection light is emitted from the lamp unit 1102 of the white light source, the light is transmitted through the plurality of mirrors 1106 inside the light guide 1104.
The light components R, G, and B corresponding to the three primary colors of RGB are divided by the dichroic mirrors 1108, and guided to the light valves 10R, 10G, and 10B corresponding to the respective colors. Then, the light valves 10R, 10G and 1
The light components corresponding to the three primary colors modulated by 0B respectively are:
After being recombined by the dichroic prism 1112, it is projected as a color image on a screen or the like via the projection lens 1114.

In FIG. 27, a laptop personal computer 1200, which is another example of electronic equipment, has the above-mentioned liquid crystal display panel 10 provided in a top cover case, and further accommodates a CPU, a memory, a modem, and the like. And a main body 120 incorporating a keyboard 1202
4 is provided.

In FIG. 28, a pager 1300, which is another example of the electronic equipment, includes a liquid crystal display panel 10 in which a driving circuit 1004 is mounted on a MIM array substrate in a metal frame 1302 to form a liquid crystal display module. Light guide 1306 including 1306a, circuit board 1308, first and second shield plates 1310 and 13
12, housed with two elastic conductors 1314 and 1316 and a film carrier tape 1318. In the case of this example, the above-described display information processing circuit 1002
(See FIG. 25) may be mounted on the circuit board 1308 or on the MIM array substrate of the liquid crystal display panel 10. Further, the drive circuit 1004 is connected to the circuit board 1.
It is also possible to mount on 308.

Since the example shown in FIG. 28 is a pager, a circuit board 1308 and the like are provided. However, the driving circuit 1004 and further the display information processing circuit 1002
Liquid crystal display panel 1 with a liquid crystal display module
In the case of 0, the liquid crystal display panel 10 fixed in the metal frame 1302 is produced, sold and used as a liquid crystal display device or as a backlight type liquid crystal display device incorporating a light guide 1306 in addition thereto. It is also possible to do the same.

Further, as shown in FIG.
In the case of the liquid crystal display panel 10 on which the display circuit 4 and the display information processing circuit 1002 are not mounted, the IC 1324 including the drive circuit 1004 and the display information processing circuit 1002 is
TCP (Tape Carrier Packag) implemented on 322
e) Physically and electrically connected to 1320 through an anisotropic conductive film provided on the periphery of the MIM array substrate 30, it is possible to produce, sell, use, etc. as a liquid crystal display device. is there.

In addition to the electronic devices described above with reference to FIGS. 26 to 29, a liquid crystal television, a viewfinder type or a monitor direct-view type video tape recorder, a car navigation device, an electronic organizer, a calculator, a word processor, a workstation , Mobile phones, videophones, POS terminals,
A device equipped with a touch panel or the like is an example of the electronic device shown in FIG.

The checker 1 as described above
By using 50 to adjust the charge voltage of the liquid crystal in the charge mode and in the discharge mode to be equal,
Since it is possible to prevent a DC voltage from being applied to the liquid crystal for a long period of time, it has a relatively simple configuration, is capable of high-gradation display, has high reliability in gradation display, and has a long-term reliability. Various electronic devices provided with a liquid crystal display device capable of performing good display can be realized.

[0150]

According to the present invention, a display screen is divided into a first area and a second area, and a scan signal having a charge mode waveform and a scan signal having a discharge mode waveform are divided in each area. Data signals having the same gradation value are supplied independently to at least the data lines in the region included in the first region and the region included in the second region, Is configured to adjust the voltage of the scanning signal so that the luminance of the liquid crystal becomes equal.
Voltage application can be reliably prevented.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of a MIM driving element provided in a liquid crystal display panel according to an embodiment of the present invention, together with a pixel electrode.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 shows M provided in the embodiment of the liquid crystal display panel.
It is sectional drawing which shows the other example of an IM drive element.

FIG. 4 shows M provided in the embodiment of the liquid crystal display panel.
It is a top view which shows the other example of an IM drive element with a pixel electrode.

FIG. 5 is a sectional view taken along line BB of FIG. 4;

FIG. 6 is an equivalent circuit diagram showing a circuit constituting an embodiment of a liquid crystal display panel.

FIG. 7 is a partially broken perspective view schematically showing an embodiment of a liquid crystal display panel.

FIG. 8 is a block diagram illustrating an embodiment of a scanning signal drive circuit.

FIG. 9 is a timing chart showing a data fetching operation of the scanning signal drive circuit of FIG. 8;

FIG. 10 is a diagram illustrating a relationship between output voltage selection data supplied to the scanning signal drive circuit of FIG. 8 and an output voltage.

11 is a waveform chart showing the magnitude relation between the output voltages shown in FIG.

FIG. 12 is a timing chart illustrating a scanning signal output operation of the scanning signal drive circuit of FIG. 8;

FIG. 13 is a block diagram illustrating an embodiment of a data signal driving circuit.

FIG. 14 is a block diagram illustrating an embodiment of a drive control circuit.

15 is a timing chart showing an operation example of the liquid crystal display panel of FIG.

FIG. 16A is a plan view showing a divided state of a screen at the time of voltage adjustment according to the first embodiment of the present invention, and FIG. 16B is a diagram showing a scanning signal waveform in each area.

FIG. 17 is a timing chart showing a relationship between output voltage selection data and a scanning signal waveform during voltage adjustment according to an embodiment of the present invention.

FIG. 18 is a front view schematically showing an embodiment of a drive voltage adjusting device.

19 is a front view schematically showing a display example of a monitor screen in the drive voltage adjusting device of FIG.

FIG. 20 is a block diagram illustrating an embodiment of a liquid crystal display device including a power supply circuit.

FIG. 21 is a circuit diagram illustrating an embodiment of a drive voltage adjustment circuit.

FIG. 22 is a graph showing a shift in luminance with respect to a gradation change in the liquid crystal display panel.

FIG. 23A is a plan view showing a divided state of a screen at the time of voltage adjustment according to the second embodiment of the present invention, and FIG. 23B is a diagram showing a scanning signal waveform in each area.

FIG. 24A is a diagram showing an example of a driving waveform in a charge / discharge mode according to the second embodiment of the present invention, and FIG. 24B is a diagram showing a drive waveform in the charge / discharge mode according to the second embodiment of the present invention; FIG. 9 is a diagram illustrating another example of a driving waveform.

FIG. 25 is a cross-sectional view illustrating a liquid crystal projector as an example of an electronic apparatus.

FIG. 26 is a front view showing a personal computer as another example of the electronic apparatus.

FIG. 27 is an exploded perspective view showing a pager as an example of an electronic apparatus.

FIG. 28 is a perspective view illustrating a liquid crystal display device using TCP as an example of an electronic apparatus.

FIG. 29 is a diagram showing a basic configuration of a liquid crystal display panel using a conventional MIM drive element or the like.

FIG. 30 is a block diagram showing a schematic configuration of a conventional liquid crystal display panel.

31A and 31B are timing charts according to a conventional driving method, in which FIG. 31A shows the voltage value and supply timing of a data signal supplied to a data line Xi, and FIG. 31B shows the voltage of the data signal supplied to a scanning line Yj. Value and supply timing,
(C) is a timing chart showing the voltage value applied to both ends of the MIM drive element and the liquid crystal layer and the timing of the change, respectively.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Liquid crystal display panel 12, 48 ... Scan line 14 ... Data line 18 ... Liquid crystal layer 20, 20 ', 40a, 40b ... MIM drive element 30 ... MIM array substrate 32 ... Opposite substrate 34, 45 ... Pixel electrode 100 ... Scan line Drive circuit 110 data line drive circuit 120 drive control circuit 130 power supply circuit 132 intermediate potential generator 135 CD adjustment circuit 150 checker 151 tester 152 CCD 154 personal computer 155 monitor 155a monitor display screen 1100 ... LCD projector 1200 ... Personal computer 1300 ... Pager

Claims (10)

[Claims] A pair of substrates; a liquid crystal interposed between the pair of substrates; a plurality of data lines provided on one substrate; a plurality of scanning lines provided on the other substrate; A liquid crystal display panel comprising a two-terminal non-linear element connected in series between a line and the scanning line, and a plurality of pixels composed of the liquid crystal; and applying a data signal and a scanning signal to the data line and the scanning line. A driving device for supplying a driving voltage to the driving device, and a power supply device for supplying a driving voltage to the driving device. A driving voltage adjusting method for a liquid crystal display device, comprising: a scanning line group corresponding to a first region of a display screen; Supplying a scan signal consisting of only a charge mode having a first selection voltage value for conducting a two-terminal nonlinear element; and providing a scan line group corresponding to a second region other than the first region to the second line. The terminal type nonlinear element is turned on to A precharge voltage having a polarity opposite to the first selection voltage based on an intermediate value of the data signal, and a precharge voltage that is output continuously to the precharge voltage and has a polarity opposite to the precharge voltage based on the intermediate value. Supplying a scan signal including a discharge mode having a second selection voltage, and at least a data line in a region included in the first region and a data line in a region included in the second region have the same level. Supplying a data signal having a tone value; measuring luminance of each of the regions to which the data signal having the same gradation value is supplied; and, according to the measurement result, luminance of each of the regions. Adjusting the drive voltage so as to make them equal. A method for adjusting the drive voltage of a liquid crystal display device, comprising: 2. The method according to claim 1, wherein the step of supplying a scan signal in the second region is a step of supplying only a scan signal in a discharge mode having the precharge voltage and the second selection voltage. The method for adjusting a driving voltage of a liquid crystal display device according to claim 1. 3. The step of supplying a scanning signal in the second area includes a pair of a signal in the charge mode and a signal in a discharge mode having the precharge voltage and the second selection voltage. 2. The method according to claim 1, wherein the driving signal is supplied as a scanning signal. 4. A pair of substrates, a liquid crystal interposed between the pair of substrates, a plurality of data lines provided on one substrate, a plurality of scanning lines provided on the other substrate, and A driving device for a liquid crystal display panel comprising a two-terminal type non-linear element connected in series between a scanning line and a scanning line, and a plurality of pixels including the liquid crystal, wherein a driving mode is changed according to an external input. Mode switching means for switching between a normal drive mode and a voltage adjustment mode, and when the drive mode switched by the mode switching means is a voltage adjustment mode, a scan line group corresponding to the first area of the display screen is displayed. Supplying a scan signal consisting only of a charge mode having a first selection voltage value for conducting the two-terminal nonlinear element, and applying a scan line group corresponding to a second area other than the first area to the scan line group. 2-terminal type A precharge voltage of opposite polarity to said first selected voltage relative to the intermediate value of the data signal to conduct linear element,
Supplying a scan signal including a discharge mode that is continuously output to the precharge voltage and has a second selection voltage having a polarity opposite to the precharge voltage with respect to the intermediate value;
Scanning signal driving means; and data signal driving means for supplying data signals having the same gradation value to data lines in at least the area included in the first area and the area included in the second area, respectively. A driving device for a liquid crystal display panel, comprising: 5. The scanning signal driving unit supplies only a scanning signal in a discharge mode having the precharge voltage and the second selection voltage in the second region. 5. The driving device for a liquid crystal display panel according to 4. 6. The scanning signal driving means, in the second area, pairs a signal in the charge mode and a signal in a discharge mode having the precharge voltage and the second selection voltage in a pair. The driving device for a liquid crystal display panel according to claim 4, wherein the driving signal is supplied as a scanning signal. 7. The MIM (Me)
7. The driving device for a liquid crystal display panel according to claim 4, comprising a tal insulator metal) driving element. 8. 8. The liquid crystal display panel driving device according to claim 4, further comprising: a liquid crystal display panel; and a power supply device for supplying a driving voltage to the driving device. A liquid crystal display device, wherein the power supply device is provided with the drive voltage adjusting means. 9. A mounting table on which the liquid crystal display device according to claim 8 is mounted, signal supply means for supplying a video signal accompanied by a synchronization signal to a driving device of the liquid crystal display device, and A mode switching signal output unit that outputs a voltage adjustment mode switching signal; a luminance measuring unit that measures luminance of a display screen of the liquid crystal display device mounted on the mounting table; and a unit that displays a measured value of the luminance measuring unit. A voltage adjustment device for a liquid crystal display device, comprising: 10. An electronic apparatus comprising the liquid crystal display device according to claim 8.