JPH11133454A - Liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of display density unevenness by conductively bringing into contact at least a part of a laying electrode of a common electrode provided on an inside surface of a second substrate with a current path increasing electrode provided on the inside surface of a first substrate through seal material containing conductive material. SOLUTION: The laying electrode 24b of the common electrode provided on the inside surface of the second substrate 20 is constituted so as to come into contact with the current path increasing electrode 25 provided on the inside surface of the first substrate 30 through the seal material 26 containing the conductive material. In such a manner, even when the laying electrode 24b is long in e.g. its length, and its wiring resistance value of the laying electrode 24b itself is large, by electrically bringing into contact it with the seal material 26 containing the conductive material and the current path increasing electrode 25, and making them one electrode, the wiring resistance value is reduced. Then, a transmission light quantity is controlled by a voltage applied between a segment electrode and the common electrode opposite to each other.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a first substrate having a segment electrode (signal-side electrode) on its inner surface and external lead-out electrodes for segment electrodes and common electrodes, and a common electrode (scanning electrode) on its inner surface. Electrodes) and a second substrate provided with a common electrode routing electrode electrically connected to the common electrode, for example, at a peripheral portion of these substrates via a sealing material, and adhered to the first substrate. The present invention relates to a liquid crystal display device (liquid crystal display element) in which liquid crystal is interposed between a substrate and a second substrate, and the amount of transmitted light is controlled by a voltage applied between a segment electrode and a common electrode facing each other.

[0002]

2. Description of the Related Art In recent years, liquid crystal display devices (liquid crystal display devices) have attracted attention as displays serving as man-machine interfaces in portable devices such as PDAs (portable information terminals) and mobile phones. FIG. 5 is a schematic plan view showing an example of this type of liquid crystal display device (liquid crystal display device), and FIG.
It is sectional drawing in a line.

Referring to FIGS. 5 and 6, this liquid crystal display device has a first substrate 30 provided with a segment electrode (signal side electrode) 32 on the inner surface and a common electrode (scanning electrode; common side) on the inner surface. The second substrate 20 provided with the display electrode 22 is bonded to the inner peripheral portions of the substrates 20 and 30 by a sealing material 26.

That is, on the inner surface of the first substrate 30, a wiring pattern of stripe-like ITO electrodes 32 is formed as segment electrodes, and these segment electrodes 32 extend straight, and the first substrate 30 Are exposed as part of the external lead-out wiring electrode 43. The inner surface of the second substrate 20 has a stripe-shaped I
The wiring pattern of the TO electrode 22 is formed as a common electrode. Here, the common electrode 22 is connected to the first substrate 30.
Is formed so as to be orthogonal to the segment electrode 32 formed on the inner surface of the common electrode 22.
In order to form the external lead-out wiring electrodes 42 on the first substrate 30 (along with (in parallel with) the external lead-out wiring electrodes 43 of the segment electrodes 32), the first substrate 3
0), the wiring pattern of the common electrode 22 on the second substrate 20 is changed to, for example, a sealing material 2.
6 and bent at a right angle so as to be parallel to the wiring pattern of the segment electrode 32 on the first substrate 30, and this is bent around the common electrode 22 (routing electrode; common electrode 2).
2 and a second electrode 24 electrically connected to the second electrode.
This routing electrode 24 electrically connected to the common electrode 22 on the substrate 20 of the first substrate 3 is connected to the first substrate 3 via a vertical conduction portion (through hole) 29 formed in the sealing material 26.
0 (see FIG. 6), and exposed on the first substrate 30 together with the wiring pattern (wiring electrode for external drawing) 43 of the segment electrode 32 to form a wiring electrode 42 for external drawing.

[0005] In the plan view of FIG.
And the segment electrode 32 are shown as if they intersect, but as is clear from the cross-sectional view, the common electrode 22 and the segment electrode 32 do not actually intersect (that is, Contact (short circuit)).

As described above, the second substrate 20 and the first substrate 30 are faced (opposed) such that a part of the ITO electrode 22 and a part of the ITO electrode 32 are respectively exposed, and are heat-pressed. This is used as a liquid crystal display element substrate. In other words, the second substrate 20 and the first substrate 30 face each other at an interval determined by the thickness of the gap material (spacer) 35, and the second substrate 20 and the first substrate 30 The second substrate 20 and the first substrate 3 are exposed in such a manner that a part of the ITO electrode 22 and a part of the ITO electrode 32 are exposed.
Except for the liquid crystal injection part 40, the periphery of each other is sealed (sealed) by the seal material 26, thereby producing a liquid crystal display element substrate.

In such a liquid crystal display element substrate, the second
The liquid crystal injection section 4 is provided in a gap between the substrate 20 and the first substrate 30 separated by the sealing material 26 and the gap material 35.
By injecting a liquid crystal material from 0 and then sealing the liquid crystal injection portion 40 with a sealant, this can be manufactured as a liquid crystal display device (liquid crystal display element).

In this case, the liquid crystal display device (liquid crystal display element substrate) has a so-called one side in which both external lead-out wiring electrodes (electrode extraction portions) 42 and 43 are formed on the first substrate 30. It is of the electrode extraction type.

In the liquid crystal display device thus manufactured,
The amount of transmitted light can be controlled by a voltage applied between the opposed segment electrode and the common electrode. That is, the intersection (intersection of the wiring pattern) between the stripe-shaped common electrode 22 and the stripe-shaped segment electrode 32 can function as one dot on the liquid crystal display screen. More specifically, by applying a predetermined drive signal to the exposed external lead-out wiring electrode 42 and the external lead-out wiring electrode 43, a drive signal is applied to the common electrode 22 via the lead-out electrode 24, Further, a drive signal is directly applied to the segment electrode 32 and the common electrode 2
2. By changing the alignment state of the liquid crystal at the intersection of the segment electrodes 32, predetermined characters, figures, and the like can be displayed on this screen.

[0010]

In the liquid crystal display device (liquid crystal display element) of the above-mentioned type in which the one-sided electrode is taken out, the external lead-out wiring electrodes 42 and 43 are provided on one substrate, in the example of FIG. 30 (since a voltage is externally applied to the electrode pattern on the substrate 30 side where the external lead-out wiring electrode is not provided via the upper and lower conductive portions 29), the mounting form can be simplified. There is an advantage that the size can be reduced.

By the way, in the liquid crystal display device (liquid crystal display element) of the one-side electrode take-out type as described above, the second substrate 2
At 0, the common electrode 22 is wired from the external lead-out wiring electrode 42 to the display section via the lead-out electrode 24.
(That is, the routing electrode 24 is bent at a right angle at a suitable position so as to be orthogonal to the segment electrode 32 on the first substrate 30 to form the common electrode 22). Electrode; electrode take-out part)
The common electrode 22 close to the common electrode 22 and the common electrode 22 remote from the external connection terminal (external lead-out wiring electrode; electrode take-out part) have different lengths of the lead electrode 24 to the common electrode 22. There is a problem that a difference in wiring resistance value due to a difference in length of 24 affects a driving voltage applied to a display unit.

In particular, the display section is constituted by a dot matrix section and an icon section, the icon section is arranged far from the external connection terminals, and the display electrode area of the icon section is larger than the display electrode area of one line of the dot matrix section. When the flowing current is large, the wiring resistance of the lead electrode 24 to the icon section increases, and the voltage drop due to this increases, and there is a problem that a sufficient voltage cannot be applied to the icon section. Was. As described above, in the liquid crystal display device (liquid crystal display element) of the one-side electrode take-out type, there is a problem that uneven display density occurs due to a difference in voltage drop due to a difference in wiring resistance of the routing electrode 24.

As a method for reducing the difference in the voltage drop due to the wiring resistance, a method using an electrode having a small surface resistance (first method) or a method of devising the electrode pattern (making the width of the routing electrode 24 smaller). To make the wiring resistance uniform)
(Second method) can be considered. However, the first method has a problem that an electrode having a small surface resistance is more expensive than an electrode having a large surface resistance due to its manufacturing method. In the second method,
If there is a restriction such as a narrow area where the routing electrode 24 is arranged, there is a problem that this cannot be applied.

The present invention provides a liquid crystal capable of effectively preventing display density unevenness due to a difference in voltage drop due to a difference in wiring resistance of a routing electrode even when an electrode having a relatively high surface resistance is used. It is an object to provide a display device.

[0015]

In order to achieve the above-mentioned object, according to the present invention, there is provided a first substrate having a segment electrode and an external lead electrode for a segment electrode and a common electrode on an inner surface. And a second substrate provided on the inner surface thereof with a common electrode and a common electrode routing electrode electrically connected to the common electrode via a sealing material, and the first substrate and the second substrate are bonded to each other. In a liquid crystal display device in which a liquid crystal is sandwiched between the substrates and the amount of transmitted light is controlled by a voltage applied between a segment electrode and a common electrode facing each other,
The sealing material contains a conductive material,
At least a portion of the routing electrode extends along a portion on the second substrate to which the sealing material is adhered, and the first substrate has an inner surface on the second substrate. A current path increasing electrode is further formed at a portion where the sealing material is adhered so as to face at least a part of the routing electrode, and a common electrode provided on the inner surface of the second substrate is drawn. At least a part of the circling electrode is configured to be in conductive contact with a current path increasing electrode provided on the inner surface of the first substrate via a sealing material containing a conductive material. .

According to a second aspect of the present invention, in the liquid crystal display device according to the first aspect, a part of the pattern of the routing electrodes is provided in a sealing material.

According to a third aspect of the present invention, in the liquid crystal display device according to the first or second aspect, the routing electrode formed on the second substrate is a sealing material containing a conductive material. And electrically connected to an external lead electrode formed on the first substrate via the first substrate.

[0018]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a diagram showing a configuration example of a liquid crystal display device according to the present invention, FIG. 2 is a cross-sectional view taken along line AA of FIG. 1, and FIG. 3 is a cross-sectional view taken along line BB of FIG. FIG.
Referring to FIG. 1, the liquid crystal display device includes a first substrate 30 having a segment electrode (signal-side electrode) 32 on the inner surface;
Common electrode (scanning electrode; common side display electrode) 2 on the inner surface
And the second substrate 20 provided with the first and second substrates 20 and 30
At the substantially inner peripheral portion of the inside of the device, it is configured to be bonded by a seal material 26.

Here, in the present invention, the sealing material 26 contains a conductive material. As the conductive material, for example, conductive particles (for example, room temperature, load speed of 0.158 gf /
The compressive breaking strength of the particles measured under the condition of seconds is 4 kgf / m
m ² or less, and at a temperature of 120 to 170 ° C.
It is possible to use conductive particles having a conductive layer on the surface of the core material particles which are non-plastically crushed by pressing at a pressure of 30 kg / cm ² for 1 to 10 seconds and having an average particle size of about 2 to 30 μm). Such conductive particles can be used as the sealing material 2
6 (for example, insulating adhesive), 50 to 5000 pieces / mm
It can be dispersed and used in the amount of ² . In this case, when the first substrate 30 and the second substrate 20 are bonded (compressed) with the sealing material 26 in which the conductive particles are dispersed as described above, the first substrate 30 Due to the conductive particles contained in the sealing material 26 interposed between the first substrate 30 and the second substrate 20,
A sealing material having a conductive property in the direction (vertical direction) connecting to 0, but not having a conductive property in the horizontal direction (the insulating property of the sealing material 26 itself is maintained). Function as

More specifically, in the configuration example of FIG. 1, a stripe-shaped ITO electrode 3 is formed on the inner surface of the first substrate 30.
Two wiring patterns are formed as segment electrodes, and these segment electrodes 32 extend straight and are exposed as external lead-out wiring electrodes 43 on a part of the first substrate 30. On the inner surface of the second substrate 20, a wiring pattern of the ITO electrodes 22 in a stripe shape is formed as a common electrode. Here, the common electrode 2
2 are formed so as to be orthogonal to the segment electrodes 32 formed on the inner surface of the first substrate 30.
Is formed on the first substrate 30 (segment electrode 3
The wiring pattern of the common electrode 22 on the second substrate 20 is formed together with (in parallel with) the second external lead-out wiring electrode 43 on the exposed portion of the first substrate 30 by, for example, a sealing material. Immediately before 26, it is bent at a right angle so as to be parallel to the wiring pattern of the segment electrode 32 on the first substrate 30, and this is bent to a routing portion of the common electrode 22 (routing electrode; electrically connected to the common electrode 22). The common electrode 22 on the second substrate 20
A portion 24a of the routing electrode 24 is brought into contact with the sealing material 26 only when it is connected to the external lead-out wiring electrode 42 on the first substrate 30, and the sealing material containing a conductive material is formed. The first substrate 30 is extended (see FIG. 2) through the material 26 (via the sealing material 26 containing the conductive material (upper and lower conductive portions)) (see FIG. 2). It is exposed together with the wiring pattern of the electrode 32 (the external lead-out wiring electrode 43) to form the external lead-out wiring electrode.

On the other hand, the common electrode 22 on the second substrate 20
The other portion 24b of the routing electrode 24 extends along the portion on the second substrate 20 to which the sealing material 26 is bonded, that is, contacts the sealing material 26 containing a conductive material. And then extended over the first substrate 30 via the sealing material 26 containing the conductive material (via the upper and lower conductive portions of the sealing material 26 containing the conductive material). (Refer to FIG. 3). On the first substrate 30, the wiring pattern of the segment electrode 32 (external wiring electrode 43) is exposed to form an external wiring electrode 42.

Incidentally, in the plan view of FIG.
And the segment electrode 32 are shown as if they intersect, but as is clear from the cross-sectional view, the common electrode 22 and the segment electrode 32 do not actually intersect (that is, Contact (short circuit)).

Further, according to the present invention, the sealing material 26 contains a conductive material, and the first substrate 30 has a current path increasing electrode 25 on the inner surface of the first substrate 30 where the sealing material 26 is bonded. Are further formed. That is, in the present invention, as shown in FIG. 3, a part 24 b of the routing electrode 24 of the common electrode 22 provided on the inner surface of the second substrate 20
Are configured to be in conductive contact with a current path increasing electrode 25 provided on the inner surface of the first substrate via a sealing material 26 containing a conductive material.

In other words, according to the present invention, the first substrate 30 provided with the segment electrodes 32 and the external lead electrodes 43 and 42 for the segment electrodes and the common electrodes on the inner surface.
And a second substrate 20 having a common electrode 22 and a common electrode routing electrode 24 electrically connected to the common electrode 22 on the inner surface thereof, which are bonded to each other with a sealant 26 therebetween. In a liquid crystal display device in which a liquid crystal is interposed between the substrate 30 and the second substrate 20 and the amount of transmitted light is controlled by a voltage applied between the segment electrode 32 and the common electrode 22 facing each other, Contains a conductive material, and at least a part of the routing electrode 24 is a second substrate 2 to which the sealing material 26 is adhered.
0, and the first substrate 30 has an inner surface facing the at least a part of the routing electrodes 24 on the second substrate 20 by the sealing material. A current path increasing electrode 25 is further formed in a portion to which 26 is bonded, and at least a part of the routing electrode 24 of the common electrode 22 provided on the inner surface of the second substrate 20 is made of a conductive material. It is configured to be in conductive contact with the current path increasing electrode 25 provided on the inner surface of the first substrate 30 via the sealing material 26 contained therein.

Here, the segment electrode 32 and the external lead-out wiring electrode 4 formed on the first substrate 30 are used.
3, 42, a current path increasing electrode 25, a common electrode 22 formed on the second substrate 20, and a routing electrode 2
4 is configured as an ITO electrode (transparent electrode).

As described above, a part 2 of the routing electrode 24 of the common electrode 22 provided on the inner surface of the second substrate 20
4b, as shown in FIG. 3, the routing electrode 24b is connected via a sealing material 26 containing a conductive material.
Since it is configured to be in conductive contact with the current path increasing electrode 25 provided on the inner surface of the first substrate, the routing electrode 24b is, for example, long, and the wiring resistance of the routing electrode 24b itself is small. Even if the value is large,
This is brought into electrical contact with the sealing material 26 containing a conductive material and the current path increasing electrode 25, and by using them as one electrode, the wiring resistance can be reduced.

In such a configuration, the segment electrodes 32 and the external lead-out wiring electrodes 4 are formed on the first substrate 30.
3, 42, a current path increasing electrode 25 is formed, and a common electrode 22 and a routing electrode 24 are formed on the second substrate 20.
Is formed, the second substrate 20 and the first substrate 30 are
Heat-press bonding is performed such that the external lead-out wiring electrodes 42 and 43 are exposed (facing) so as to be exposed. That is,
The second substrate 20 and the first substrate 30 face each other at an interval determined by the thickness of the gap material (spacer) 35, and the second substrate 20 and the first substrate 30 are In a manner such that the lead-out wiring electrodes 42 and 43 are exposed, substantially the periphery of each of the second substrate 20 and the first substrate 30 except for the liquid crystal injection part 40 includes the sealing material 26 containing a conductive material. , Thereby producing a liquid crystal display element substrate.

Then, the second substrate 20 and the first substrate 30
A liquid crystal material is injected from the liquid crystal injection part 40 into a gap separated by the sealing material 26 and the gap material 35 between the liquid crystal material and the liquid crystal injection part 40. Thereafter, the liquid crystal injection part 40 is sealed with a sealing agent, thereby forming a liquid crystal. It can be manufactured as a display element.

In the liquid crystal display device thus manufactured,
The amount of transmitted light can be controlled by a voltage applied between the opposed segment electrode and the common electrode. That is, the intersection (intersection of the wiring pattern) between the stripe-shaped common electrode 22 and the stripe-shaped segment electrode 32 can function as one dot on the liquid crystal display screen. More specifically, by applying a predetermined drive signal to the exposed external lead-out wiring electrode 42 and the external lead-out wiring electrode 43, a drive signal is applied to the common electrode 22 via the lead-out electrode 24, Further, a drive signal is directly applied to the segment electrode 32 and the common electrode 2
2. By changing the alignment state of the liquid crystal at the intersection of the segment electrodes 32, predetermined characters, figures, and the like can be displayed on this screen.

By the way, in the liquid crystal display device (liquid crystal display element) of the one-sided electrode extraction type as described above, as described above, the external connection terminal (external extraction wiring electrode; electrode extraction portion) is formed on the second substrate 20. Common electrode 2 close to
2 and the common electrode 22 remote from the external connection terminal (external lead-out wiring electrode; electrode take-out portion), the length of the routing electrode 24 to the common electrode 22 is different from each other. There is a problem that the difference in the wiring resistance value due to the difference affects the drive voltage applied to the display unit.

On the other hand, in the present invention, the second substrate 20
A part of the routing electrode 24 (the routing electrode which is considered to be long) 24b of the upper common electrode 22 is replaced with the sealing material 26 containing a conductive material and the first substrate 3.
In a state of being in electrical contact with the current path increasing electrode 25 on the zero, it extends along the installation portion of the sealing material 26.
(See FIG. 3), the wiring resistance of the routing electrode 24b can be substantially reduced. For example, the substantial wiring resistance value of the long routing electrode 24b can be made to be substantially the same as the wiring resistance value of the short routing electrode 24a. In this way, the routing electrodes having different lengths are formed, and even if the wiring resistance is different due to the difference in length, the routing electrodes are formed of a sealing material (containing a conductive material) even if the wiring resistance values are different due to the difference in length. By contacting the current path increasing electrode via the sealing material), the wiring resistance can be controlled to a desired value, and the display caused by the difference in the voltage drop due to the difference in the wiring resistance of the routing electrode. Density unevenness can be effectively prevented. That is, it is possible to avoid the problem that the difference in the wiring resistance value due to the difference in the length of the routing electrode affects the driving voltage applied to the display unit.

In particular, as shown in FIG. 4, the display section is composed of a dot matrix section and an icon section, the icon section is arranged far from the external connection terminals, and the display electrode area of the icon section is one of the dot matrix section. When the current flowing is larger than the display electrode area for the line, the wiring resistance of the leading electrode 24b to the icon part is larger than the wiring resistance of the leading electrode 24a to the dot matrix part. Although there was a problem that a sufficient voltage could not be applied to the icon portion due to a large voltage drop, the lead-out electrode 24b to the icon portion contained a conductive material as shown in FIG. Through the sealing member 26 to be in conductive contact with the current path increasing electrode 25 provided on the inner surface of the first substrate. Suppressing an increase in wiring resistance of the pull turning electrodes 24, it is possible to suppress the voltage drop, it is possible to apply a sufficient voltage to the icon portion.

[0033]

EXAMPLE As an example of the present invention, a transparent electrode film (surface resistance 3
00Ω / □) are formed on two transparent plastic film substrates (thickness: 150 μm) 20, 30. One of the two substrates 20 becomes a common-side electrode pattern of a liquid crystal display element. As described above, the other sheet 30 was patterned using a known photolithography technique so as to become a segment side electrode pattern of the liquid crystal display element. And
When the common side substrate 20 and the segment side substrate 30 are combined (overlaid), the display portion of the liquid crystal display element has a plurality of strip-shaped (striped) common electrodes 2.
2 and a plurality of strip-shaped (stripe-shaped) segment electrodes 32 are orthogonally opposed to each other, so that a dot matrix portion serving as a plurality of square picture elements, a segment electrode and a common electrode are formed. The overlapping portion is composed of an icon portion having the shape of a character or a symbol.

At this time, the lead-out electrode to the common-side electrode pattern for the dot matrix portion was arranged at a position not facing the segment-side electrode. Further, a part of the lead-out electrode to the common-side electrode pattern to the icon part was arranged at a position (a part along the seal material) which became an outer peripheral seal after cell formation. In addition, a current path independent of other routing electrodes and display electrodes is provided on the surface of the segment-side substrate facing a part of the routing electrode to the common-side electrode pattern to the icon portion, that is, the first substrate 30. An increasing electrode pattern 25 was provided. As shown in FIG. 3, the current path increasing electrode pattern 25 is electrically connected to the common side drawing electrode 24 via the conductive particles (dispersed in the sealing material) after cell formation. (Provided to reduce the effective wiring resistance by increasing the current path).

After the wiring patterns were formed on each of the substrates 20 and 30 as described above, the respective substrates 20 and 30 were subjected to an orientation agent application, baking, and rubbing process. Next, the second substrate 20 having no external connection terminals (external wiring electrodes 42, 43) (that is, a substrate on which a plurality of common-side electrode patterns are formed) is provided with the first substrate 20. substrate
(That is, when the plurality of segment electrode patterns and the external connection terminals (substrate provided with the external lead-out wiring electrodes 42 and 43) 30 are overlapped, the external connection terminals (the external lead-out wiring Electrodes 42, 4
In order to expose 3), a rectangular precut hole was punched out with a mold blade at a corresponding position. Then, a gap material 35 for obtaining a desired cell gap was sprayed on the second substrate 20.

Next, on the first substrate 30, a sealing material 26 serving as an outer peripheral seal of the liquid crystal display element after cell formation was printed by a screen printing method. Here, conductive particles made of resin whose surface was subjected to gold plating were dispersed in the sealing material 26. The first reason for dispersing the conductive particles in the sealing material 26 is that the lead-out electrode 24 formed on the second substrate 20 and the external lead-out electrode formed on the first substrate 30 are used. This is for electrically connecting the wiring electrode 42 via the conductive particles in the sealing material 26 (for forming the upper / lower conductive portion). Thus, in other words, by dispersing the conductive particles in the sealing material 26, the vertical conductive portions (through holes) 2 are formed in the sealing material 26 as shown in FIG.
9 need not be provided.

The first reason for dispersing the conductive particles in the sealing material 26 is that the conductive particles are formed on the routing electrode 24 formed on the second substrate 20 and on the first substrate 30. The current path increasing electrode pattern 25 and the sealing portion 26
This is for increasing the current path by making electrical connection through the conductive particles in the inside.

In this way, after the gap material 35 is sprayed on the second substrate 20 and the sealing material 26 containing conductive particles is printed on the first substrate 30, 20 and the first substrate 30 are superimposed, a pair of superimposed substrates 20 and 30 are sandwiched between a glass plate having a smooth surface and a balloon made of silicon rubber, air is sealed in the balloon, and the superposed substrates are stacked. Is heated in a pressurized state, and the sealing material 26 is
Was cured.

Next, the pair of substrates 20 and 3
After cutting 0, liquid crystal was sealed to obtain a plurality of liquid crystal display elements. The liquid crystal display element thus manufactured has no display density unevenness due to the difference between the wiring resistance of the lead electrode to the icon part and the wiring resistance of the lead electrode to the dot matrix part, and the display state when a drive voltage is applied. Was good.

COMPARATIVE EXAMPLE In the comparative example , a liquid crystal display element was manufactured in the same manner as in the above-described embodiment using a substrate on which an electrode having a surface resistance of 300 Ω / □ was formed. The current path increasing electrode pattern 25 in the example was not formed. The liquid crystal display device of the comparative example manufactured in this manner is:
The wiring resistance of the lead electrode to the icon portion was large, and when a drive voltage was applied, a clear difference (unevenness) was observed between the display density of the dot matrix portion and the display density of the icon portion.

[0041]

As described above, according to the first to third aspects of the present invention, the first electrode provided with the segment electrode and the external lead-out electrode for the segment electrode and the common electrode on the inner surface. A substrate and a second substrate having a common electrode on the inner surface and a common electrode routing electrode electrically connected to the common electrode are bonded to each other with a sealant therebetween, and the first substrate and the second substrate are bonded together. In a liquid crystal display device in which liquid crystal is sandwiched between two substrates and the amount of transmitted light is controlled by a voltage applied between a segment electrode and a common electrode facing each other,
The sealing material contains a conductive material, and at least a part of the routing electrode extends along a portion on the second substrate to which the sealing material is adhered, and the first substrate has A current path increasing electrode is further formed on a portion of the inner surface thereof to which at least a part of the routing electrode on the second substrate is adhered and a sealing material is adhered;
At least a part of the routing electrode of the common electrode provided on the inner surface of the second substrate is provided, via a sealing material containing a conductive material, for increasing the current path provided on the inner surface of the first substrate. Since it is configured to make conductive contact with the electrode, the effective wiring resistance can be reduced for the routing electrode that is in conductive contact with the current path increasing electrode via the sealing material, and the routing electrode itself Even when an electrode having a relatively large surface resistance is used, it is possible to effectively prevent display density unevenness due to a difference in wiring resistance. In particular, by providing the current path increasing electrode, even when the pattern width of the routing electrode is reduced, the same wiring resistance as when the pattern width of the routing electrode is large can be obtained.
It is possible to provide a compact (small) liquid crystal display device (liquid crystal display element) by minimizing the pattern width of the routing electrode as much as possible.

According to the second aspect of the present invention, since a part of the routing electrode pattern is provided in the sealing portion, a so-called peripheral portion from the display portion to the outer shape of the liquid crystal display element is provided.
(Frame part) can be narrowed.

According to the third aspect of the invention, in the liquid crystal display device according to the first or second aspect, the second
Since the routing electrode formed on the first substrate is electrically connected to the external extraction electrode formed on the first substrate via a sealing material containing a conductive material, In order to electrically connect the common electrode and the lead-out electrode to the external lead-out electrode on the first substrate, it is not necessary to provide the upper and lower conduction holes in the sealing material as in the related art.

[Brief description of the drawings]

FIG. 1 is a diagram showing a configuration example of a liquid crystal display device according to the present invention.

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

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a schematic plan view illustrating an example of a liquid crystal display element (liquid crystal display device).

FIG. 5 is a schematic plan view illustrating an example of a liquid crystal display device (liquid crystal display device).

FIG. 6 is a sectional view taken along line BB in FIG. 5;

[Explanation of symbols]

 REFERENCE SIGNS LIST 20 second substrate 22 common electrode 24 routing electrode 25 current path increasing electrode 26 sealing material 29 vertical conductive portion 30 first substrate 32 segment electrode 35 gap material 42 external lead-out wiring electrode 43 external lead-out wiring electrode

Claims (3)

[Claims] 1. A first substrate having a segment electrode and an external lead electrode for a segment electrode and a common electrode on an inner surface, and a common electrode electrically connected to the common electrode and the common electrode on an inner surface. A second substrate provided with a routing electrode is bonded to the second substrate via a sealing material, a liquid crystal is interposed between the first substrate and the second substrate, and a liquid crystal is interposed between the opposing segment electrode and the common electrode. In a liquid crystal display device that controls the amount of transmitted light by a voltage applied to the sealing material, the sealing material contains a conductive material, and at least a part of the routing electrode has a sealing material to which the sealing material is adhered. 2
The sealing material is adhered to the first substrate on an inner surface of the first substrate so as to face at least a part of the routing electrodes on the second substrate. The current path increasing electrode is further formed in a portion to be formed, and at least a part of the routing electrode of the common electrode provided on the inner surface of the second substrate is provided via a sealing material containing a conductive material. A liquid crystal display device configured to make conductive contact with a current path increasing electrode provided on an inner surface of the first substrate. 2. The liquid crystal display device according to claim 1, wherein
A part of the pattern of the routing electrode is provided in a sealing material. 3. The liquid crystal display device according to claim 1, wherein the routing electrode formed on the second substrate is connected to the first substrate via a sealing material containing a conductive material. A liquid crystal display device electrically connected to an external lead electrode formed in the liquid crystal display device.