JPH08194235A - Liquid crystal display device - Google Patents

Abstract

PURPOSE: To make it possible to dispose dummy pixels for protecting MIM elements of display pixels against the dielectric breakdown by the static electricity generated during the process without impairing the aesthetic appearance of display. CONSTITUTION: The parts which are the non-display regions on the outer side of a display region and are apart a distance from the terminal of the non-display regions are provided with the dummy pixels 10a, 10b, etc. These dummy pixels 10a, 10b, etc., are respectively separately driven by two-terminal nonlinear elements 11a, 11b, etc., for dummies which are more susceptible of the dielectric breakdown than two-terminal nonlinear elements 4 for display and, therefore, the dielectric breakdown takes place in the two-terminal nonlinear elements 11a, 11b, etc., for dummies more preferentially to the two-terminal nonlinear elements 4 for display when these elements receive the static electricity.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly to a switching element for driving a pixel.
The present invention relates to a liquid crystal display device having a terminal non-linear element.

[0002]

2. Description of the Related Art In recent years, liquid crystal display devices have been used for display applications such as personal computers, word processors, terminal display devices for office automation, and televisions because of their features of low power consumption, thinness, and light weight. Larger capacity display and higher image quality are required.

A conventional liquid crystal display device has a TN (Twist)
ed Nematic) method or STN (Super)
r Twisted Nematic) method,
Simple matrix drive by the voltage averaging method has been adopted. However, this method is not suitable for large-capacity display because a sufficient contrast ratio cannot be obtained due to an increase in the number of scanning lines.

Therefore, a liquid crystal display device has been developed in which a switching element is provided in each pixel constituting the display screen and active display is performed. Although a thin film transistor or a two-terminal non-linear element is used as the switching element, a liquid crystal display device using the two-terminal non-linear element, which has a simple structure and is advantageous in terms of manufacturing cost, is considered promising. Among these switching elements, metal-insulator-metal (Metal-Insulator-
Metal, hereinafter referred to as MIM. ) MIM having structure
The device has been put to practical use.

FIG. 8 is a plan view showing one pixel in a liquid crystal display device using a conventional MIM element. Further, FIG. 9 is a cross-sectional view taken along the line DD ′ of FIG. One pixel 108 is composed of a pixel electrode 102 formed on the surface 101a of the glass substrate 101, a signal wiring 103, and a MIM element 104 shown by hatching. The MIM element 104 includes the lower electrode 10 branched from the signal wiring 103.
3a, an insulating film 105 made of an insulator formed on the lower electrode 103a, and an upper electrode 1 covering the insulating film 105.
It is a two-terminal non-linear element composed of 06 and. Generally, tantalum (Ta) is used for the lower electrode 103a, and the insulating film 1 is used.
Tantalum oxide (TaO _x ) is used for 05, and chromium (Cr), titanium (Ti), or aluminum (Al) is used for the upper electrode 106.

A liquid crystal display device is constructed by disposing a counter substrate having a counter electrode opposite to a glass substrate 101 provided with such an MIM element 104 in each pixel and enclosing a liquid crystal between the two substrates. Is manufactured.

[0007]

By the way, the above-mentioned MIM
Since the insulating film 105 of the element 104 has a thickness of about 500 to 700 angstroms, it has a low electric breakdown voltage and can easily be dielectrically broken down by static electricity generated during the manufacturing process of the liquid crystal display device. As a result, the upper and lower electrodes of the MIM element 104 are short-circuited, and the pixel in which the MIM element 104 does not function as a switching element appears as a point defect on the screen, which deteriorates the yield in manufacturing a liquid crystal display device.
Therefore, as a measure against static electricity, humidity control during the manufacturing process,
Although workers are grounded and ion showers are performed, it is not possible to completely prevent dielectric breakdown of MIM elements.

Further, the point defect due to the dielectric breakdown of the MIM element is likely to occur at the end of the portion where the pixels are arranged. Therefore, in order to protect the MIM element from dielectric breakdown, a conductive member is formed or a dummy pixel having the MIM element is formed outside the display region in which the pixel for displaying is provided. A method of forming a conductive member outside the display area is disclosed in, for example, Japanese Patent Publication No. 4-224499, and a method of forming the dummy pixel outside the display area is disclosed in, for example, JP-A-3-45934, JP-A-5-142578 or JP-A-5-142578. No. 5,1969,970.

The conductive member is formed in order to discharge the electrostatic charges generated during the manufacturing process to avoid the accumulation of the charges.
The dummy pixel is formed in order to reduce the potential difference due to dielectric breakdown of the MIM element provided therein.

However, although the point defect can be reduced by the above-mentioned method, there is a possibility that the aesthetic appearance of the liquid crystal display device at the time of displaying may be impaired. For example, the conductive member is arranged in the immediate vicinity of the display region in which the display pixels are arranged, the display region and the conductive member are adjacent to each other, and when the illuminated liquid crystal display device is viewed, the conductive member does not contribute to the display. Since the pattern of the member inevitably comes into view, it is not preferable in terms of aesthetics.

On the other hand, even when the dummy pixel is formed, the pattern of the dummy pixel directly enters the visual field when the display pixel which is illuminated and displayed is seen, which is also unfavorable in terms of appearance. In particular, when there is a dummy pixel near the display pixel array portion that is the display area, the dummy pixel is
Although it is configured to be electrically independent of the display area and not driven, it is further unsightly because the dummy pixels are turned on by being charged due to the influence when the display pixels in the display area are driven. Usually, the pitch of the pixels is several 100 μm (the distance between adjacent pixels is several tens μm), so that covering only the dummy pixels with a cover or the like requires high accuracy, and in some cases, it may occur in the display area. Problems may occur because the parts are also covered up. There is also a method of avoiding lighting by using a metal electrode for the pixel electrode of the dummy pixel to shield the light, but this is a problem because it remains an aesthetic problem and it is not easy to confirm the destruction of the dummy element.

The present invention has been made to solve the problems of the prior art, and a dummy pixel for protecting a MIM element of a display pixel from dielectric breakdown due to static electricity generated during a process is displayed. An object of the present invention is to provide a liquid crystal display device that can be arranged without impairing the appearance.

[0013]

A liquid crystal display device of the present invention is a liquid crystal display device in which a liquid crystal is provided between a pair of substrates and a non-display region is provided outside a display region, and a matrix is provided in the display region. 2 terminals for display in which each of a plurality of display pixels arranged in a striped pattern has an insulating film sandwiched by a pair of electrodes, one of which is an electrode connected to a signal wiring wired from the display area to the non-display area Each of the dummy pixels driven separately by the non-linear element and provided in a portion in the non-display area and apart from the end of the display area has one electrode connected to the signal line. The insulating film is sandwiched between a pair of electrodes, and each of them is driven by a dummy two-terminal non-linear element that is easier to cause dielectric breakdown than the display two-terminal non-linear element, thereby achieving the above object. In the liquid crystal display device of the present invention, a plurality of dummy pixels may be formed per signal line.

In the liquid crystal display device of the present invention, the element area of the dummy 2-terminal nonlinear element is 2 for the display.
The configuration can be smaller than the element area of the terminal nonlinear element.

In the liquid crystal display device of the present invention, the element area of the dummy two-terminal nonlinear element may be gradually reduced as the distance from the display area increases.

In the liquid crystal display device of the present invention, the dummy two-terminal non-linear element has a step portion on the side surface of the electrode formed earlier than the insulating film than the display two-terminal non-linear element. The distance between the step portions of the insulating film formed to have can be long.

[0017]

According to the present invention, the dummy pixel is provided in the non-display area outside the display area, which is spaced apart from the end of the non-display area. Since the dummy 2-terminal nonlinear elements that are more susceptible to dielectric breakdown than the terminal nonlinear elements are driven separately, when static electricity is applied, the dummy 2-terminal nonlinear elements take precedence over the display 2-terminal nonlinear elements. Dielectric breakdown.

Since the bezel of the liquid crystal cell and the outer cover of the product to be assembled cover the outer peripheral portion of the liquid crystal display device up to the vicinity of the seal portion of the liquid crystal cell, the dummy pixel does not directly enter the visual field and the appearance is impaired. There is no. Further, since the pixel electrode of the dummy pixel may remain transparent, it becomes easy to confirm the dielectric breakdown of the dummy element by turning on the light.

If the element area of the dummy 2-terminal nonlinear element is smaller than the element area of the display 2-terminal nonlinear element, the withstand voltage becomes low and is preferentially destroyed. At this time, by disposing a plurality of dummy 2-terminal nonlinear elements per signal wiring, it is possible to cope with static electricity generation a plurality of times. Further, by providing a plurality of dummy 2-terminal nonlinear elements so that the element area becomes smaller toward the outside of the display area, it becomes possible to cause dielectric breakdown from the side far from the display area.

Further, in the portion where the upper electrode and the lower electrode overlap, in the step portion of the insulating film which covers the side surface of the lower electrode, the film quality of the insulating film is apt to deteriorate and the electric field is concentrated, so that the dielectric breakdown is apt to occur. Therefore, the dummy 2-terminal nonlinear element is also preferentially broken down by making the distance of the step portion longer than the step distance of the display 2-terminal nonlinear element.

[0021]

EXAMPLES Examples of the present invention will be specifically described below.

(First Embodiment) FIG. 3 is a front view showing the appearance of the liquid crystal display device 18 in the first embodiment. FIG. 1 is an enlarged view of a portion C of the element side substrate 1 of the liquid crystal display device 18. 2 is an enlarged plan view showing a portion C of the counter side substrate 12 which is bonded to the element side substrate 1 with the liquid crystal layer sandwiched therebetween. 4 is a plan view showing one pixel of the element-side substrate 1, and FIG. 5 is a sectional view taken along the line AA ′ of FIG.

This liquid crystal display device has an element side substrate 1 and a counter side substrate 12 which are arranged opposite to each other with a liquid crystal serving as a display medium interposed therebetween. As shown in FIG. A non-display area is provided inside the liquid crystal cell in the immediate vicinity, and a display area B is provided inside the non-display area. Part of the upper and lower non-display areas is C, that is, the dummy MIM elements 11a, 11b, 11c and 11 shown in FIG.
Dummy pixels 10a, 10b, 1 having d and 11e, respectively
0c, 10d, and 10e are formed.

In the element side substrate 1, a plurality of signal wirings 3 are formed on the surface 1a of the glass substrate 1 from the display area B to the non-display area. Each of the signal wirings 3 is similarly connected to the element-side terminal 15 which is an external terminal formed on the surface 1a of the glass substrate 1. A plurality of display pixels 8 are provided in the display area B along each of the signal wirings 3, and five types of dummy pixels 10a, 10b, 10c, 10d, 10e are provided in one non-display area.
Is provided.

The display pixel 8 includes a pixel electrode 2 provided along each of the signal wirings 3 and a counter substrate 1 shown in FIG.
The second surface 12a is formed of a portion facing a plurality of counter electrodes 13 formed in a strip shape. This display pixel 8 is driven by MI connected to the signal line 3 and the pixel electrode 2.
This is performed via the M element 4. On the other hand, the dummy pixel 10a and the like are configured by a portion in which the dummy pixel electrode formed on the element-side substrate 1 and the counter electrode 14 formed on the surface 12a of the counter-side substrate 12 face each other. This dummy pixel 10a,
Driving of 10b, etc. is performed by dummy MIM elements 11a, 11
b and so on.

Although the MIM element 4 and the dummy MIM elements 11a and 11b have the same structure, the latter element area is smaller than the former element area and the latter element area is smaller. Was gradually reduced from 11e to 11a. As shown in FIGS. 4 and 5, the configuration of the MIM element is such that the lower electrode 3a is provided on the lower side with the insulating film 5 interposed therebetween.
The upper electrode 6 is provided on the upper side. The lower electrode 3a is composed of a portion branched from the signal wiring 3. The upper electrode 6 is connected to the pixel electrode 2 in the display area B and is connected to the dummy pixel electrode in the non-display area.

The counter electrode 13 intersects the signal wiring 3,
For example, it is formed in each row so as to overlap the pixel electrodes 2 in the orthogonal direction, and is connected to the opposite side terminal 16 which is an external terminal provided on the opposite side substrate 12. In addition, the counter electrode 14
Is connected to a terminal 17 provided separately from the opposite side terminal 16.

Next, a method of manufacturing the liquid crystal display device having such a structure will be described.

First, the element side substrate 1 is manufactured as follows. On the surface 1a of the glass substrate 1 which is the element side substrate,
A first conductor, for example, a tantalum (Ta) thin film, which becomes the signal wiring 3 and the lower electrode 3a of the MIM element 4, is formed by a sputtering method.

Next, the first conductor is patterned by a photolithography process to obtain the lower electrode 3a of the MIM element 4 and the signal wiring 3 in the display pixel 8. Further, the insulating film 5 is formed on at least the lower electrode 3a by the anodic oxidation method.

Next, a metal thin film, for example, a titanium (Ti) thin film to be the upper electrode 6 of the MIM element 4 is formed by the sputtering method and the photolithography method.

Then, similarly, the pixel electrode 2 is formed on the ITO.
Patterning is performed using (Indium Tin Oxide). In the present embodiment, the area of the MIM element 4 in the display pixel 8 is represented by the plan view shown in FIG.
It was set to 4 μm (Ta width) × 4 μm (Ti width).

MIM element 4 formed as described above
The portion in which the display pixels 8 having the are arranged constitutes the display area B for actually displaying the screen. Further, simultaneously with the formation of the display pixels 8 as described above, dummy MIM elements 11a, 11b, 11c, 1 are formed in the non-display area outside the display area B.
Dummy pixels 10a, 10b having 1d and 11e,
10c, 10d, and 10e are formed as follows. That is, the dummy pixels 10a, 10b, 10c, 10
Since d and 10e have the same basic constituent material as the display pixel 8, they are formed at the same time as the display pixel 8. The formation positions of the dummy pixels 10a and the like are outside the display area B, and
In the liquid crystal cell in the immediate vicinity of the liquid crystal seal portion 9 which is located at a distance from the end of the liquid crystal cell. In addition, the dummy MIM element 11a,
11b, 11c, 11d, and 11e are formed on the signal wiring 3.

The element-side terminal 15 may be formed simultaneously with the formation of the signal wiring 3, or may be formed in a separate process. The element-side substrate 1 is manufactured as described above.

On the other hand, the counter substrate 12 is formed by patterning the counter electrodes 13 and 14 on the surface 12a of the glass substrate 12 which is the counter substrate in the same manner with ITO. Also,
At the same time, or in a separate step, the opposite side terminals 16 and the terminals 17 are formed.

Element-side substrate 1 manufactured as described above
And the opposite-side substrate 12 are opposed to each other and bonded to each other.
The liquid crystal display device of this embodiment is manufactured by enclosing the liquid crystal between the liquid crystal display device 12 and the liquid crystal display device 12.

In the liquid crystal display device having such a structure, the dummy pixels 10a, 10b, 10c, 10d and 10e are
5 per signal wiring, outside the display area B,
It was formed in the cell in the immediate vicinity of the liquid crystal seal portion 9, which is spaced from the end of the display area B. One dummy pixel is effective per signal line, but the dummy MIM element 1
It is more preferable to dispose a plurality of MIM elements for dummy in order to cope with the absence of dummy MIM elements due to defective formation such as 1a and the occurrence of static electricity a plurality of times.

Further, the dummy pixels 10a, 10b, 10
The element areas of the dummy MIM elements 11a, 11b, 11c, 11d, and 11e formed in c, 10d, and 10e are smaller than that of the MIM element 4 of the display pixel 8 and are further increased as the distance from the end of the display area B increases. Small, that is, 1
The size was gradually reduced from 1e to 11a. For example, the element area of the dummy MIM element 11e is 3.5 μm.
m (Ta width) × 4 μm (Ti width), MI for dummy
The element area of the M element 11d is 3 μm × 4 μm, the element area of the dummy MIM element 11c is 3 μm × 3 μm, and the element area of the dummy MIM element 11b is 2.5 μm × 2.5.
μm, the element area of the dummy MIM element 11a is 2 μm
× 2 μm

As described above, the element area of the dummy MIM element is made smaller than that of the MIM element 4 of the display pixel 8, and 1
The reason for sequentially decreasing from 1e to 11a is as follows. That is, the five types of dummy MI
The element area of the M element is the same as the MIM element 4 in the display pixel 8.
Although it is effective even if it is the same as the area of, the breakdown voltage is the same, so it is not sufficient to protect the MIM element 4 of the display pixel 8. Therefore, as described above, the area of the dummy MIM element is made smaller than the element area of the MIM element 4 in the display pixel 8. Further, if the sizes are successively reduced, the withstand voltage of the dummy MIM element is lowered, and the dummy MIM elements are more likely to be preferentially dielectrically broken down by static electricity in the order of 11a to 11e, which is more preferable. As described above, the dummy MIM element is used in the MIM in the display pixel.
Since it is formed without changing the element and the constituent material,
It does not affect the manufacturing cost of the liquid crystal display device.

In particular, in this embodiment, the dummy pixel is formed in the immediate vicinity of the liquid crystal seal portion 9 with the distance between the end of the display area B and the dummy pixel 10e set to 4 mm. By doing so, it becomes possible to cover the dummy pixel with the bezel of the liquid crystal cell and the outer cover of the product to be incorporated, which has been difficult at the conventional formation position of the dummy pixel, and even if the dummy pixel is turned on by charging. Without directly entering the field of view,
The aesthetics were not spoiled.

Further, since the dummy pixel does not actually contribute to the display and unnecessary lighting must be avoided, the external terminal for connecting the counter electrode 14 shown in FIG. 2, that is, the terminal 17 shown in FIG. Counter electrode 13 provided in display area B
The external terminal for connection with the terminal, that is, the opposite side terminal 16 shown in FIG. Since the external terminal of the counter electrode 14 of the dummy pixel is independent in this way, it is possible to avoid lighting the dummy pixel when the liquid crystal display device is driven. Further, since the external terminal of the counter electrode 14 is separately provided as the terminal 17, if the terminal 17 is connected to an external power source, the dummy pixels 10a, 10b, 10c, 1 are connected.
0d and 10e can be turned on, and the dummy element 11
The dielectric breakdown of a, 11b, 11c, 11d and 11e can be easily confirmed.

In the above embodiment, since the counter electrode 14 does not contribute to the display, the counter electrode 14 is formed to have a width corresponding to 5 pixels. However, like the display pixel 8, the counter electrode 14 may be formed for each row.

In the present embodiment, the point defect in the dummy pixel and the display pixel was examined. As a result, in the range of the display area B of 320 × 480 dots, there were 0 point defects in the display pixel while the dummy pixel had the point defect. There was 15.8%. Further, the number of point defects of 5 or less could be 52.6%.

(Second Embodiment) In the dummy MIM element, instead of making the element area smaller than the element area of the MIM element of the display pixel, the distance of the step portion generated at the overlapping position of the upper electrode and the lower electrode is set. It is also effective to make it longer than the step distance in the MIM element of the display pixel. In a device such as the MIM structure, the insulating film 5 at the step portion formed at the overlapping position of the upper electrode 6 and the lower electrode 3a as shown by 7 in FIG. Then, the insulation is easily broken down by Joule heat due to the concentration of current. Further, the insulating film 5 in the step portion is apt to be damaged due to deterioration in film quality due to the problem of film forming technology.

FIG. 6 is a plan view showing an element side substrate of a liquid crystal display device according to the second embodiment of the present invention, which is provided with a dummy pixel 10 'having such a dummy MIM element 11'. 2 and 3 are a front view showing the appearance of the liquid crystal display device according to the second embodiment and a plan view of the opposite substrate.
Since it is the same as the above, it is omitted.

In this embodiment, the display MIM element in the display area is the same as in the first embodiment, and the dummy MIM element 11 'in the non-display area has a two-part structure as shown in FIG. That is, the element area of each of the two dummy MIM elements 11 ′ is the element area of the display MIM element 4 ′.
The size is 2 μm × 4 μm obtained by dividing μm × 4 μm into two. Therefore, the distance of the step portion of the dummy MIM element 11 'is twice the distance of the step portion of the display MIM element. Therefore, the dummy MIM element 11 ′ has the display MIM.
Dielectric breakdown occurs preferentially over the device. MI for this dummy
Even if the dummy pixel pixel 2 ′ is connected to the M element 11 ′ as shown in FIG. 7, the MI of the display pixel 8 is reduced.
It is effective for protecting the M element. In FIG. 7, 3'is a lower electrode and 6'is an upper electrode.

Further, in the present embodiment, the plurality of dummy MIM elements 11 'are arranged for each signal wiring in order to avoid the absence of the dummy MIM element due to the formation failure as described above and to prevent the static electricity from being applied a plurality of times. This is so that the occurrence can be dealt with. By doing so, a liquid crystal display device with fewer point defects can be obtained. In addition,
Even in the case of the present embodiment, since it is possible to obtain the dummy MIM element which is preferentially subjected to dielectric breakdown simply by changing the shape, the number of manufacturing steps and the cost do not increase.

Although the dummy MIM element is divided into two in the second embodiment, the present invention is not limited to this, and the dummy MIM element may be divided into three or more to increase the distance of the step portion.

[0049]

As described in detail above, according to the present invention, each of the dummy pixels provided in the non-display area outside the display area, which is spaced from the end of the non-display area. However, since each is driven by a dummy 2-terminal nonlinear element that is more susceptible to dielectric breakdown than a display 2-terminal nonlinear element, the dummy 2-terminal nonlinear element causes the dummy 2-terminal nonlinear element to display when static electricity is received. The two-terminal nonlinear element of the display pixel can be protected because the insulation breakdown is preferentially performed over the element and the potential difference is alleviated.

Further, since the outer peripheral portion of the liquid crystal display device is covered with the bezel of the liquid crystal cell and the outer cover of the product to be incorporated, the dummy pixel does not directly enter the visual field and the aesthetic appearance is not impaired. You can keep the beauty. Further, since the pixel electrode of the dummy pixel may remain transparent, it becomes easy to confirm the dielectric breakdown of the dummy element by turning on the light.

Further, by forming a plurality of dummy pixels per signal wiring, it is possible to deal with the absence of dummy pixels due to defective formation and the occurrence of static electricity a plurality of times, so that a liquid crystal display device with fewer point defects is provided. Can be provided. At this time, if a plurality of dummy 2-terminal nonlinear elements are provided so that the element area becomes smaller toward the outside of the display area, it becomes possible to cause dielectric breakdown from the side far from the display area. Further, even if the step portion distance in the dummy 2-terminal nonlinear element is made longer than that in the 2-terminal nonlinear element of the display pixel, the potential difference is relieved by preferentially dielectric breakdown due to static electricity. The terminal nonlinear element can be protected.

[Brief description of drawings]

FIG. 1 is a plan view showing an element-side substrate of a liquid crystal display device according to a first embodiment of the present invention.

FIG. 2 is a plan view showing a counter substrate of the liquid crystal display device according to the first embodiment of the present invention.

FIG. 3 is a front view showing the outer appearance of the liquid crystal display device according to the first embodiment of the present invention.

FIG. 4 shows a liquid crystal display device 1 according to a first embodiment of the present invention.
It is a top view which shows a pixel.

5 is a cross-sectional view taken along the line A-A 'in FIG.

FIG. 6 is a plan view showing an element-side substrate of a liquid crystal display device according to a second embodiment of the present invention.

FIG. 7 is a plan view showing dummy pixels of a liquid crystal display device according to a second embodiment of the present invention.

FIG. 8 is a plan view showing one pixel in a liquid crystal display device using a conventional MIM element.

9 is a cross-sectional view taken along the line D-D 'of FIG.

[Explanation of symbols]

1 element side substrate 2, 2'pixel electrode 3, 3'signal wiring 3a, 3'a lower electrode 4 MIM element 5 insulating film 6, 6'upper electrode 8 display pixel 9 liquid crystal seal portion 10a, 10b, 10c, 10d, 10e, 10 '
Dummy pixels 11a, 11b, 11c, 11d, 11e, 11 '
MIM element 12 counter side substrate 13 counter electrode 14 counter electrode 15 element side terminal 16 counter side terminal 17 terminal 18 liquid crystal display B display area

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Toshiyuki Yoshimizu 22-22 Nagaike-cho, Abeno-ku, Osaka-shi, Osaka Inside Sharp Corporation

Claims (5)

[Claims] 1. A liquid crystal display device in which a liquid crystal is provided between a pair of substrates, and a non-display region is provided outside a display region, wherein each of a plurality of display pixels provided in a matrix in the display region. , Each of which is driven by a two-terminal non-linear element for display in which an insulating film is sandwiched by a pair of electrodes, one of which is an electrode connected to a signal wiring wired from the display area to the non-display area, In each of the dummy pixels provided in a portion away from the end of the display area, the insulating film is sandwiched by a pair of electrodes, one of which is an electrode connected to the signal wiring, A liquid crystal display device that is driven separately by a dummy two-terminal non-linear element that is more susceptible to dielectric breakdown than a two-terminal non-linear element. 2. The liquid crystal display device according to claim 1, wherein a plurality of the dummy pixels are formed per signal line. 3. The liquid crystal display device according to claim 1, wherein the element area of the dummy 2-terminal nonlinear element is smaller than the element area of the display 2-terminal nonlinear element. 4. The liquid crystal display device according to claim 2, wherein the element area of the dummy two-terminal nonlinear element gradually decreases with increasing distance from the display region. 5. The two-terminal non-linear element for dummy is formed to have a step on the side surface of the electrode formed earlier than the insulating film than the two-terminal non-linear element for display. The distance between the steps of the insulating film is long.
The described liquid crystal display device.