JPH11153806A - Liquid crystal display element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a good display free of abnormal lighting by making the wiring patterns of the lead parts of electrodes for display hardly visible by dummy electrodes, improving the look in appearance and preventing the generation of such electric fields as to change the alignment state of liquid crystal molecules between the dummy electrodes of one substrate and the lead parts of another substrate. SOLUTION: The inside surfaces of both substrates are provided with the dummy electrodes 21, 23 in correspondence to the non-display regions exclusive of the display regions where the electrodes for display of both substrate face each other. The parts corresponding to the wiring regions of the lead parts 5a of the other substrate among the dummy electrodes 21 of the one substrate are divided to plural electrically floating electrodes 21b. These divided floating electrodes are respectively disposed to face only the lead parts 5a of the one electrode among the electrodes 5 for display disposed on the other substrate described above.

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 which prevents erroneous lighting due to static electricity.

[0002]

2. Description of the Related Art Liquid crystal display devices include a segment display system, a dot matrix display system, and a display system which performs both dot matrix display and segment display.

FIGS. 8 to 15 show a conventional liquid crystal display device which performs both dot matrix display and segment display. FIG. 8 is a front view of the liquid crystal display device, and FIGS. 9 and 10 show the liquid crystal display device. 11 and 12 are enlarged views of the XI and XII portions of FIG. 9, and FIGS. 13 and 14 are XII and XII portions of FIG.
FIG. 15 is an enlarged view of an XIV portion, and FIG.
It is an expanded sectional view along the XV-XV line.

In this liquid crystal display device, a pair of transparent substrates 1 and 2 made of glass or the like are joined via a frame-shaped sealing material 10, and a region surrounded by the sealing material 10 between the two substrates 1 and 2. 8 to 1 of the screen (a liquid crystal enclosing area surrounded by the sealing material 10).
The area A below the boundary line indicated by the chain line at 0 is a dot matrix display area, and the area B above the boundary line is a segment display area.

The liquid crystal display device shown in FIG. 1 is used for a display area of an electronic organizer having a communication function using a telephone line, and is provided in the dot matrix display area A.
, A telephone number, the name of the other party, etc. are displayed, and in the segment display area B, the state of voice recording (memo) and other mode switching, the type of telephone being used (whether or not a public telephone) and the like are displayed.

In this liquid crystal display device, a transparent conductive film such as an ITO film is formed on the inner surfaces of a pair of substrates 1 and 2 opposed to each other with a liquid crystal layer therebetween so as to correspond to a dot matrix display area A and a segment display area B, respectively. Is provided.

That is, one substrate (the rear substrate in the figure)
As shown in FIG. 9, a plurality of display signal electrodes 3 extending in one direction are provided in parallel with each other on the inner surface of the display device 1 so as to correspond to the dot matrix display area A, and correspond to the segment display area B. A plurality of display segment electrodes 4 are provided.

As shown in FIG. 10, on the inner surface of the other substrate (front substrate 2 in the figure), there are provided a plurality of substrates along a direction substantially perpendicular to the signal electrodes 3 so as to correspond to the dot matrix display area A. The display scanning electrodes 5 are provided in parallel with each other, and a plurality of display common electrodes 6 respectively corresponding to the segment electrodes 4 are provided corresponding to the segment display area B.

In FIGS. 9 and 10, in order to simplify the drawings, the number of the signal electrodes 3 and the number of the scanning electrodes 5 in the dot matrix display area A are reduced and the widths of the electrodes are greatly exaggerated. However, the actual number of signal electrodes is about 60, the number of scanning electrodes is about 14, and the electrode width of the signal electrode 3 and the scanning electrode 5 is 0.4 to 0.5 m.
m, the interval between the electrodes is about 0.1 to 0.2 mm.

[0010] Of the pair of substrates 1 and 2, the side edge of the rear substrate 1 on which the signal electrodes 3 and the segment electrodes 4 are provided on the side of the dot matrix display area A is the other substrate (front substrate) 2. And a plurality of scanning electrodes connected to the lead portions 3 a of the signal electrodes 3 and the scanning electrodes 5 of the front substrate 2, respectively, on the protruding portion of the rear substrate 1. The connection line 7 is wired, and a plurality of external circuit connection electrodes 8 are provided.

The lead portions 3a of the signal electrodes 3 are respectively derived from the respective signal electrodes 3, and are mounted on the overhanging portion of the substrate 1 as shown by two-dot chain lines in FIG. The scanning electrode connecting lines 7 are wired from the driving circuit arranging portion to a predetermined portion of the substrate joining portion by the sealing material 10. The external circuit connection electrode 8 is formed from a side edge of the overhang portion toward the drive circuit arrangement portion.

The drive circuit element 9 has a main surface on which an input terminal electrode and an output terminal electrode are arranged on the rear substrate 1.
Are bonded by an anisotropic conductive adhesive or the like so as to be opposed to the overhanging edges of the lead portions 3 of the signal electrodes 3.
a and the scanning electrode connection line 7 are connected to each output terminal electrode of the drive circuit element 9, and the external circuit connection electrode 8 is connected to the input terminal electrode of the drive circuit element 10.

Each of the lead portions 4a of the plurality of segment electrodes 4 provided on the rear substrate 1 is connected to the tip of a predetermined one of the signal electrodes 3. The segment electrodes (three electrodes for displaying “public” and two electrodes for displaying “memo”) 4 that display one piece of information with a plurality of electrodes are connected to each other via their lead portions 4a. The lead 4 a of one of the electrodes is connected to a predetermined signal electrode 3.

On the other hand, the lead portions 5a of the scanning electrodes 5 provided on the front substrate 2 are led out from one end of each scanning electrode 5 to one side edge of the front substrate 2 as shown in FIG. These lead portions 5a are wired toward predetermined portions of the substrate joining portion by the seal material 10 and have a connection member (not shown) having a size that fits within the width of the seal material 10.
Are electrically connected to the respective scanning electrode connection lines 7 wired to the overhanging portion of the rear substrate 1 via the.

A plurality of common electrodes 6 provided on the front substrate 2 in correspondence with the segment electrodes 4 of the rear substrate 1 are respectively provided in the first row of the scanning electrodes 5. Scan electrode close to segment display area B)
5 is connected to a lead portion 6a led out from the side edge.

Each of the common electrodes 6 is an electrode having an outer shape obtained by simplifying the contour of the segment electrode 4 facing the electrode, and one of the common electrodes 6 displays one information. The common electrode 6 facing the segment electrode 4 is formed in an outer shape facing all of the plurality of segment electrodes 4.

The lead portions 6a of each common electrode 6
In order to prevent the drive voltage applied between the common electrode 6 and the segment electrode 4 from being applied between the lead portion 6a and the lead portion 4a of the segment electrode 4,
The segment electrode 4 is provided at a position shifted from the lead portion 4a.

The liquid crystal display device is, for example, TN
(Twisted nematic) type, wherein the liquid crystal molecules of the liquid crystal layer are provided on the inner surfaces of the substrates 1 and 2 by the electrodes 3 and
Alignment films 11, 12 provided to cover 4 and 5, 6
(See FIG. 15), the orientation direction in the vicinity of each of the substrates 1 and 2 is regulated, and the substrates 1 and 2 are twist-oriented at a predetermined twist angle. A plate (not shown) is disposed with its transmission axis or absorption axis oriented in a predetermined direction.

In the liquid crystal display element, the dot matrix display area A and the segment display area B are driven for display by time-division driving. The segment display area B is composed of the pixels of the first row of the dot matrix display area A. The display is driven in synchronization with the display drive.

Incidentally, in the above liquid crystal display device,
In the dot matrix display area A, an area where each scanning electrode 5 and each signal electrode 3 face each other (FIG. 8).
Is an effective display area A1.
However, the other area (the area outside the display area A1) is a non-display area A2, and each segment electrode 4 and the common electrode 6 in the segment display area B face each other. The area (the area surrounded by a two-dot chain line in FIG. 8) is an effective display area B1, but the other area is a non-display area B2.

In the liquid crystal display device, the lead portions 3a, 5a of the signal electrodes 3 and the scanning electrodes 5 are wired in a region corresponding to the non-display region A2 of the dot matrix display area A. , Each segment electrode 4
And the lead portions 4a, 6a of the common electrodes 6 are wired in a region corresponding to the non-display region B2 of the segment display area B, so that the lead portions 3a, 4a,
The wiring patterns 5a and 6a can be seen, and the pattern of the segment electrode 4 or the common electrode 6 in the unlit display area among the display areas B1 of the segment display area B can be seen.

That is, the signal electrode 3, the scanning electrode 5,
The display electrodes of the segment electrode 4 and the common electrode 6 and their lead portions 3a, 4a, 5a, 6a are formed of a transparent conductive film such as an ITO film, and the transparent conductive film has a light transmittance. The low, especially low-resistance ITO film has a considerably low transmittance and is not a completely colorless film, and therefore, due to a difference in transmittance between a region where the transparent conductive film is present and another region and a difference in color of transmitted light. The patterns of the lead portions 3a, 4a, 5a, 6a and the segment electrodes 4 or the common electrodes 6 can be seen.

Therefore, in the above liquid crystal display device, as shown in FIGS. 9 and 10, the display electrodes 3 and 4 of the rear substrate 1 and the display electrodes of the front substrate 2 are formed on the inner surfaces of the substrates 1 and 2, respectively. The leads 3a, 4a or 5a of the display electrodes 3, 4 or 5 and 6 on the other substrate correspond to the non-display areas A2 and B2 other than the display areas A1 and B1 where the electrodes 5 and 6 face each other. Dummy electrodes 13 and 14 are provided to make the wiring pattern 6a difficult to see. This dummy electrode 1
Reference numerals 3 and 14 are formed of a transparent conductive film such as an ITO film which is the same as the display electrodes 3, 4, 5, and their lead portions 3a, 4a, 5a and 6a.

In the figure, the display electrodes 3, 4, 5, 6 are shown.
In order to make it easier to distinguish the lead portions 3a, 4a, 5a, 6a from the dummy electrodes 13, 14, the dummy electrode 1
3, 14 are hatched.

As shown in FIG. 9, the dummy electrodes 13 of the rear substrate 1 are provided with the signal electrodes 3 and the segment electrodes 4 provided on the rear substrate 1 and their lead portions 3a, 4a.
The non-display areas A2 and A2 of the dot matrix display area A and the segment display area B except for the portions where
It is formed so as to correspond to almost the entire area of B2.

As shown in FIG. 10, the dummy electrodes 14 of the front substrate 2 are formed with the formation regions of the scanning electrodes 5 and the common electrodes 6 provided on the front substrate 2 and the lead portions 5a, 6a of the common electrodes. Except for the wiring area, it is formed so as to correspond to almost the entire non-display areas A2 and B2 of the dot matrix display area A and the segment display area B.

9 and 10, the dummy electrodes 13, 14 are shown in close contact with the display electrodes 3, 4, 5, 6 and their leads 3a, 4a, 5a, 6a. The dummy electrodes 13 and 14 are shown in FIGS.
As shown in FIG. 3, the electrodes 3, 4, 5, 6 for display and their lead portions 3 a, 4 a, 5 a, 6 a are formed with a small gap therebetween.

That is, the dummy electrodes 1 on both substrates 1 and 2
All of the dummy electrodes 13 and 1 are electrodes that are electrically floating with respect to the display electrodes 3 and 4 and their lead portions 3a, 4a, 5a and 6a.
4 are used as floating electrodes, respectively, between the lead portions 3a and 4a of the rear substrate 1 and the dummy electrodes 14 of the front substrate 2, and between the lead portions 5a and 6a of the front substrate 2 and the dummy electrodes of the rear substrate 1. No drive voltage is applied between the electrode 13 and the electrode 13.

As described above, if the dummy electrodes 13 and 14 are provided so as to correspond to the non-display areas A2 and B2 other than the display areas A1 and B1 where the display electrodes 3, 4 and 5 and 6 are opposed to each other, Lead portions 3a, 4 of display electrodes 3, 4, 5, 6
Since the transmittance and the tint of the transmitted light can be made substantially uniform between the region where the a, 5a, and 6a exist and the region where the a, 5a, and 6a do not exist, the wiring patterns of the lead portions 3a, 4a, 5a, and 6a are hardly seen. Also, the pattern of the segment electrode 4 or the common electrode 6, which is the display electrode in the segment display area B, is made difficult to see, so that the appearance can be improved.

The liquid crystal display element has a dot matrix display area A and a segment display area B. By providing a dummy electrode corresponding to a non-display area of the display area, the lead of the display electrode is provided. Making the portion less visible is employed in both a segment display type liquid crystal display element having only a segment display area and a dot matrix display type liquid crystal display element having only a dot matrix display area.

The above liquid crystal display element has dummy electrodes 13 and 14 provided on the inner surfaces of both substrates 1 and 2. The liquid crystal display element has the dummy electrode only on the inner surface of one of the substrates. In some cases, electrodes are provided to make the wiring pattern of the lead portion of the display electrode provided on the other substrate difficult to see.

[0032]

However, in the above-mentioned conventional liquid crystal display device, the dummy electrodes 13 and 14 of both substrates 1 and 2 are floating electrodes which are not grounded, and are provided on the rear substrate 1. The dummy electrode 13 is opposed to all of the lead portions 5a and 6a of a plurality of display electrodes (a plurality of scanning electrodes and a plurality of common electrodes) 5 and 6 provided on the front substrate 2, and is provided on the front substrate 2. Since the electrode 14 faces all of the leads 3a and 4a of the plurality of display electrodes (a plurality of signal electrodes and a plurality of segment electrodes) 3 and 4 provided on the rear substrate 1, during display driving, In some cases, abnormal lighting may occur at locations where the dummy electrodes on one substrate and the lead portions on the other substrate face each other.

That is, when a floating electrode which is not grounded and a conductive film to which a drive signal is supplied and which has a predetermined potential are opposed to each other with a liquid crystal layer interposed therebetween, the floating electrode is connected to the potential of the opposed conductive film. To a certain potential, but one conductive film corresponds to one floating electrode.
In this arrangement, no electric field is generated between the liquid crystal molecules and the liquid crystal molecules rise and align.

However, in the case where a plurality of conductive films are opposed to one floating electrode, if the potential difference of the drive signal supplied to these conductive films becomes larger than a certain level, the alignment of the liquid crystal molecules during that time. An electric field that changes state may occur.

In the above-described conventional liquid crystal display device, both substrates 1
The two dummy electrodes 13 and 14 are connected to the opposing lead portions 5a,
Although a floating electrode is used to prevent a drive voltage from being applied between the dummy electrode 13 and the drive portion 6a or 3a, 4a, a drive signal supplied to the lead portion 5a, 6a or 3a, 4a facing the dummy electrode 13, 14 is provided. Are not the same signal, for example, in the cross section shown in FIG. 15, these lead portions 5a are selected according to the potential difference between the lead portion 5a of the selected scanning electrode 5 and the lead portion 5a of the non-selected scanning electrode 5. An electric field E which changes the alignment state of the liquid crystal molecules is generated between the dummy electrode 13 and the opposing dummy electrode 13, and abnormal lighting occurs at that location.

According to the present invention, the wiring pattern of the lead portion of the display electrode is made invisible by the dummy electrode to improve the external appearance, and moreover, the gap between the dummy electrode of one substrate and the lead portion of the other substrate is improved. It is an object of the present invention to provide a liquid crystal display device capable of preventing a generation of an electric field that changes the alignment state of liquid crystal molecules and obtaining a favorable display without abnormal lighting.

[0037]

According to a liquid crystal display device of the present invention, display electrodes are provided on inner surfaces of a pair of substrates opposed to each other with a liquid crystal layer interposed therebetween, and at least one of the substrates has an inner surface provided with a display electrode. Dummy electrodes are provided so as to correspond to non-display areas other than the display area in which the display electrodes of both substrates face each other, and among these dummy electrodes, the dummy electrodes correspond to the wiring area of the lead portion of the other substrate. The portion is divided into a plurality of electrically floating electrodes, and each of the divided floating electrodes is provided only on a lead portion of one of the display electrodes provided on the other substrate. It is characterized by being opposed.

According to the liquid crystal display element of the present invention, the dummy electrode is provided on at least one of the inner surfaces of the substrate so as to correspond to the non-display area. The wiring pattern can be made hard to see, and the appearance can be improved.

In addition, according to this liquid crystal display element, a portion of the dummy electrode corresponding to the lead wiring region of the other substrate is divided into a plurality of electrically floating electrodes, and these divided electrodes are divided. Each of the floating electrodes is opposed only to the lead of one of the display electrodes provided on the other substrate, so that a difference occurs in the potentials of the plurality of leads on the other substrate. Also, an electric field that changes the alignment state of the liquid crystal molecules is not generated between these lead portions and the dummy electrode, and therefore, between the dummy electrode of one substrate and the lead portion of the other substrate. A good display without abnormal lighting can be obtained by preventing the generation of an electric field.

[0040]

DESCRIPTION OF THE PREFERRED EMBODIMENTS As described above, the liquid crystal display element of the present invention has at least one of the inner surfaces of the substrates corresponding to the non-display regions other than the display regions where the display electrodes of both substrates face each other. By providing a dummy electrode, the wiring pattern of the lead portion of the display electrode is made difficult to see and the appearance is improved, and further, the dummy electrode corresponds to the lead portion wiring region of the other substrate. The portion is divided into a plurality of electrically floating electrodes, and each of the divided floating electrodes is opposed only to the lead portion of one of the display electrodes provided on the other substrate. As a result, it is possible to prevent the occurrence of an electric field that changes the alignment state of the liquid crystal molecules between the dummy electrode of one substrate and the lead portion of the other substrate, and obtain a favorable display without abnormal lighting. Those were Unishi.

In the liquid crystal display device according to the present invention, it is preferable that the dummy electrodes are provided on the inner surfaces of both substrates, respectively. If the dummy electrodes are provided on both substrates, the patterns of the lead portions of both substrates are difficult to see. By doing so, the appearance can be improved.

In the case where dummy electrodes are provided on both substrates as described above, of the dummy electrodes provided on one of the substrates, a portion corresponding to the dummy electrode in a region other than the lead portion wiring region of the other substrate is used. It is desirable that the dummy electrodes are electrically connected to the display electrodes of the substrate on which the dummy electrodes are provided or the lead portions thereof. In this case, static electricity is externally applied to the portions of the two substrates where the dummy electrodes face each other. Even in such a case, the charge can be released to the display electrode or its lead portion, so that abnormal lighting due to static electricity can be suppressed.

The present invention is applicable to a liquid crystal display element having only a segment display area, a liquid crystal display element having only a dot matrix display area, and a liquid crystal display element having a dot matrix display area and a segment display area. it can.

For example, in the case of a liquid crystal display element having at least a segment display area, one substrate provided with a plurality of display segment electrodes and the other substrate provided with a display common electrode opposed to the segment electrodes Among them, on the inner surface of the other substrate, a dummy electrode corresponding to a non-display area other than a display area in which the segment electrode and the common electrode of the segment display area are opposed to each other, A portion corresponding to a wiring region of a lead portion of a segment electrode provided on the one substrate is divided into floating electrodes respectively opposed to a lead portion of one of the plurality of segment electrodes, and the one of the plurality of segment electrodes is divided into floating electrodes. On the inner surface of the substrate, corresponding to the non-display area, except for the area where the segment electrodes are formed and the wiring area of the lead portion thereof That of providing a dummy electrode is desirable.

In this case, a portion of the dummy electrode provided on the other substrate, which corresponds to a region other than the lead portion wiring region of the one substrate, is connected to an electrode integrated with the common electrode provided on the other substrate. This makes it difficult to cause abnormal lighting due to the static electricity described above.

In the case of a liquid crystal display element having at least a dot matrix display area, one substrate provided with a plurality of display signal electrodes extending in one direction and a plurality of display signal electrodes extending in a direction substantially orthogonal to the signal electrodes. Of the other substrate provided with the scanning electrode, on the inner surface of the one substrate,
Except for the formation region of the signal electrode and the wiring region of the lead portion, a dummy electrode corresponding to a non-display region other than a display region in which the plurality of scanning electrodes and the signal electrode in the dot matrix display area are opposed to each other. Providing, on the inner surface of the other substrate, a dummy electrode corresponding to the non-display region, excluding the scanning electrode formation region and the wiring region of the lead portion thereof, among the dummy electrodes of the one substrate, Dividing the portion corresponding to the lead portion wiring region of the other substrate into a plurality of floating electrodes each facing a lead portion of one of the plurality of scanning electrodes;
Dividing a portion of the dummy electrode on the other substrate corresponding to a lead portion wiring region of the one substrate into a plurality of floating electrodes respectively facing the lead portion of one of the plurality of signal electrodes. It is desirable.

[0047]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to FIGS. In this embodiment, the same components as those of the conventional liquid crystal display device shown in FIGS. 8 to 15 are denoted by the same reference numerals, and redundant description will be omitted.

FIGS. 1 and 2 are front views of a rear substrate and a front substrate of the liquid crystal display element of this embodiment, and FIGS.
5 is an enlarged view of a portion III and IV in FIG. 1, FIGS. 5 and 6 are enlarged views of a portion V and VI in FIG. 1, and FIG. 7 is an enlarged view of the liquid crystal display device taken along line XV-XV in FIG. It is sectional drawing.

The liquid crystal display device of this embodiment has a dot matrix display area and a segment display area, and the inner surface of the rear substrate 1 has a dot matrix display area A as shown in FIG. A plurality of display signal electrodes 3 and their lead portions 3a, a plurality of display segment electrodes 4 corresponding to the segment display area B and their lead portions 4a, a scanning electrode connection line 7,
An external circuit connection electrode 8 is provided in the same manner as a conventional liquid crystal display element, and a dummy electrode 21 corresponding to a non-display area of the dot matrix display area A and the segment display area B is provided.

On the other hand, as shown in FIG. 2, a plurality of display scanning electrodes 5 corresponding to the dot matrix display area A and their lead portions 5a are provided on the inner surface of the front substrate 2 in the same manner as the conventional liquid crystal display element. And a plurality of display common electrodes 22 corresponding to the segment display area B.
And dummy electrodes 2 corresponding to the non-display areas of the dot matrix display area A and the segment display area B.
3 are provided.

In the figure, the dummy electrodes 21 and 23 and
The dummy electrodes 21 and 23 are hatched in order to easily distinguish the signal electrodes 3, the segment electrodes 4, the scanning electrodes 5, and their leads 3a, 4a, 5a from the common electrode 22.

The dummy electrode 2 provided on the rear substrate 1
Reference numeral 1 denotes an electrode for making the pattern of the lead portion 5a of the scanning electrode 5 provided on the other substrate, that is, the front substrate 2, difficult to see.
Are formed of the same transparent conductive film (for example, a low-resistance ITO film) as the signal electrode 3, the segment electrode 4, and their lead portions 3a, 4a provided on the substrate.

The dummy electrode 21 of the rear substrate 1 is provided in a non-display area of the dot matrix display area A and the segment display area B, that is, the scanning electrode 5 and the signal electrode 3 in the dot matrix display area A are opposed to each other. The display area (the area corresponding to the area A1 in FIG. 8) other than the display area (the area corresponding to the area A2 in FIG. 8) starts from the segment electrode 4 in the segment display area A.
The following pattern is formed over the non-display area (the area corresponding to the area B2 in FIG. 8) other than the display area (the area corresponding to the area B1 in FIG. 8) in which the and the common electrode 22 face each other.

That is, the dummy electrode 2 on the rear substrate 1
Numeral 1 denotes a formation region of the signal electrode 3 provided on the rear substrate 1 in the dot matrix display area A and a wiring region of the lead portion 3a thereof, and a wiring region 1 provided on the rear substrate 1 of the segment display area B. Except for the formed region of the segment electrode 4 and the wiring region of the lead portion 4a, it is formed so as to correspond to almost the entire non-display region of the dot matrix display area A and the segment display area B.

Then, the dummy electrode 21 is provided with a portion corresponding to the wiring area of the lead portion 5a of the plurality of scanning electrodes 5 provided on the front substrate 2 which is the other substrate. It is formed in a pattern that is divided into a plurality of electrodes that are respectively opposed to the lead portions 5a of one electrode.

That is, the dummy electrode 21 has a large-area electrode 21a corresponding to a non-display area of the dot matrix display area A and the segment display area B other than the lead wiring area of the front substrate 2, Each of the scanning electrodes 5 on the front substrate 2 is divided into a plurality of linear electrodes 21b opposed to the lead portions 5a.

The linear dummy electrodes 21b are respectively
The electrodes are formed to have a width larger than the width of the opposing lead portion 5a, and the linear dummy electrodes 21b, 21b adjacent to each other and the large-area dummy electrode 21a
And the linear dummy electrode 21b adjacent thereto are formed at a very small interval which is hardly visible to human eyes.

In FIG. 1, the dummy electrode 21 is connected to the signal electrode 3 and the segment electrode 4 and their lead portions 3.
a, 4a, the dummy electrodes 21
As shown in FIG. 3 and FIG. 4, a small gap is formed between the electrodes 3 and 4 and their lead portions 3a and 4a.

That is, the large-area electrode 21a and the linear electrodes 21b of the dummy electrode 21 are both the signal electrode 3 and the segment electrode 4 and their lead portions 3a,
The electrode is not electrically connected to the electrode 4a and is electrically floating. Therefore, the electrode is driven between the lead 5a of each scanning electrode 5 of the front substrate 2 and the linear dummy electrode 21b facing the lead 5a. No voltage is applied.

On the other hand, the dummy electrodes 23 provided on the front substrate 2 are connected to the lead portions 3a, 4a of the signal electrodes 3 and the segment electrodes 4 provided on the other substrate, that is, the rear substrate 1.
The dummy electrode 23 is made of the same transparent conductive film (for example, a low-resistance ITO film) as the scanning electrode 5 provided on the front substrate 2, its lead portion 5 a, and the common electrode 22. It is formed with.

The dummy electrodes 23 of the front substrate 2 are formed in the following pattern from the non-display area of the dot matrix display area A and the segment display area B to the non-display area of the segment display area A. .

That is, the dummy electrodes 2 on the front substrate 2
Reference numeral 3 denotes a formation area of the scanning electrode 5 provided on the front substrate 2 in the dot matrix display area A and a wiring area of the lead portion 5a thereof, and a wiring area 3 provided on the rear substrate 1 in the segment display area B. Except for the area where the common electrode 22 is formed, it is formed so as to correspond to almost the entire non-display area of the dot matrix display area A and the segment display area B.

Then, the dummy electrode 23 is provided with a portion corresponding to the wiring area of the lead portion 3a of the plurality of signal electrodes 3 provided on the rear substrate 1, which is the other substrate, of the plurality of signal electrodes 3. Is divided into a plurality of electrodes respectively facing the lead portions 3a of one electrode, and the lead portions 4a of the plurality of segment electrodes 4 provided on the rear substrate 1 are divided.
The portion corresponding to the wiring region is formed in a pattern divided into a plurality of electrodes respectively facing the lead portions 4a of one of the segment electrodes 4.

That is, the dummy electrode 23 is provided with a large-area electrode 23a corresponding to the non-display area of the dot matrix display area A and the segment display area B other than the lead wiring area of the rear substrate 1. The plurality of linear electrodes 23b are respectively opposed to the lead portions 3a of the signal electrodes 3 of the rear substrate 1 and the lead portions 4a of the segment electrodes 4.

Each of the linear dummy electrodes 23b is
The electrode is formed to have a width larger than the width of the lead portion 3a or 4a opposed thereto, and the linear dummy electrodes 23b, 23b adjacent to each other, the large-area dummy electrode 23a and the linear electrode adjacent thereto are formed. The dummy electrodes 23b are formed at extremely small intervals that are hardly visible to human eyes.

In FIG. 2, the dummy electrode 23 is shown in close contact with the scanning electrode 5 and its lead portion 5a. However, as shown in FIG. 5 and FIG. And the lead portion 5a is formed with a small gap.

That is, each of the linear electrodes 23b of the dummy electrode 23 is a floating electrode that is electrically separated from the scanning electrode 5 and its lead portion 5a. No drive voltage is applied between the lead 3a of the electrode 3 and the lead 4a of each segment electrode 4 and the linear dummy electrode 23b facing the leads 3a, 4a.

Also, the large-area dummy electrode 23a,
The common electrode 22 provided on the front substrate 2 so as to correspond to the segment display area B is formed of an integral transparent conductive film, and the transparent conductive film is surrounded by a two-dot chain line in FIGS. The area shown is the common electrode 22, and the other area is a large-area dummy electrode 23 a also serving as a conductive film for supplying a signal to the common electrode 22.
It has become.

As shown in FIG. 6, the large area dummy electrode 23a is partially connected to the first row of electrodes (scanning electrodes closest to the segment display area B) 5 among the scanning electrodes 5 as shown in FIG. And the scanning electrodes 5 in the first row
Is supplied also to the common electrode 22 via the large-area dummy electrode 23a.

Since the potential of the large-area dummy electrode 23a of the front substrate 2 and the potential of the scanning electrode 5 in the first row are the same, in this embodiment, the dummy electrode 21 of the rear substrate 1 is
As shown in FIG. 4, the scanning electrodes 5 on the front substrate 2 are divided into linear electrodes 21b corresponding to the lead portions 5a of the scanning electrodes 5 except for the scanning electrodes 5 on the first row. Are opposed to the large-area dummy electrodes 21a of the rear substrate 1.

Further, in this embodiment, FIGS.
As shown in FIG. 5, among the lead portions 5a of the scanning electrodes 5 provided on the front substrate 2, the lead portion closest to the wiring region of the signal electrode lead portion 3a of the rear substrate 1 (lead portion of the scanning electrode in the last row). On one side of 5a, a protruding portion projecting from the one side edge of the linear dummy electrode 21a of the rear substrate 2 facing the lead portion 5a toward the wiring region side of the signal electrode lead portion 3a is integrally formed, This overhang is used as an auxiliary dummy electrode 23c.

The auxiliary dummy electrode 23c is a linear dummy electrode adjacent to the scanning electrode lead portion 5a on which the auxiliary dummy electrode 23c is formed, of the linear dummy electrodes 23b of the front substrate 2 facing the signal electrode lead portion 3a. Electrode 23b
A linear dummy electrode 2 on the rear substrate 2 facing the scanning electrode lead portion 5a on which the auxiliary dummy electrode 23c is formed.
The auxiliary dummy electrode 23c and the linear dummy electrode 23b adjacent to the auxiliary dummy electrode 23c are formed at a very small interval which is almost invisible to human eyes. ing.

According to the liquid crystal display device of this embodiment, the inner surfaces of the two substrates 1 and 2 correspond to the non-display region other than the display region where the display electrodes 3, 4 and 5 and 22 face each other. Since the dummy electrodes 21 and 23 are provided,
Of the display electrodes 3, 4, 5, and 22, the electrode having a lead portion, that is, the region where the lead portions 3 a, 4 a, and 5 a of the signal electrode 3 and the segment electrode 4 and the scan electrode 5 are respectively provided The transmittance and the color of the transmitted light can be made substantially uniform.
In addition to making the wiring patterns a, 4a, and 5a difficult to see, the pattern of the segment electrode 4 or the common electrode 22 which is the display electrode in the segment display area B is also hard to see, so that the appearance can be improved.

Further, according to this liquid crystal display device, the dummy electrodes 21 and 2 provided on the rear substrate 1 and the front substrate 2 are provided.
3, a portion corresponding to the lead wiring region of the other substrate is replaced with a plurality of electrically floating linear electrodes 21b and 23b.
And these floating electrodes 21
b and 23b are respectively opposed only to the lead portions 5a or 3a and 4a of one of the scanning electrode 5 or the signal electrode 3 and the segment electrode 4 provided on the other substrate. Even if a difference occurs in the potentials of the plurality of leads on the substrate, these leads 5a or 3a,
There is no electric field between the dummy electrode 4a and the dummy electrode 21 or 23 that changes the alignment state of the liquid crystal molecules.

That is, for example, in the cross section shown in FIG. 7, although the dummy electrodes 21 of the rear substrate 1 face the arrangement area of the lead portions 5a of the plurality of scanning electrodes 5 provided on the front substrate 2, Since the dummy electrode 21 is divided into a plurality of linear electrodes 21b facing only the lead portions 5a of one of the plurality of scanning electrodes 5, these linear dummy electrodes 21b are floating electrodes. However, the lead portion 5a of the selected scan electrode 5 and the unselected scan electrode 5
Of the lead portions 5a due to the potential difference with the lead portions 5a.
An electric field that changes the alignment state of the liquid crystal molecules is not generated between a and the dummy electrode 21b.

Accordingly, an electric field is generated between the dummy electrode 21 or 23 of one substrate 1 or 2 and the lead portion 5a or 3a, 4a of the other substrate 2 or 1 so as to change the alignment state of the liquid crystal molecules. , And a good display without abnormal lighting can be obtained.

In the above embodiment, as shown in FIG. 4, the large area dummy electrode 23a of the front substrate 2 and the lead portion 5a of the first scanning electrode 5 are connected to the large area dummy electrode 21a of the rear substrate 1. The large area dummy electrode 23 of the front substrate 2 also serves as a conductive film for supplying a signal supplied to the scanning electrodes 5 in the first row to the common electrode 22. Since the dummy electrode 23a is connected to the electrode 5 in the first row, the potential of the dummy electrode 23a is
Are the same, even if the large area dummy electrode 23a of the front substrate 2 and the lead 5a of the scanning electrode 5 in the first row face the large area dummy electrode 21a of the rear substrate 1, An electric field that changes the alignment state of the liquid crystal molecules does not occur.

Further, the liquid crystal display element is provided on both substrates 1 and 2.
As described above, the large-area electrodes 2 corresponding to regions other than the lead portion wiring region of the other substrate are used as described above.
1a, 23a and each lead 5 in the lead wiring area.
are divided into a plurality of linear electrodes 21b, 23b opposed to a or 3a, 4a, respectively, and adjacent linear dummy electrodes 21b, 21b or 23b, 23
b, and the large-area dummy electrodes 21a and 23a and the linear dummy electrodes 21b and 23b adjacent to the large-area dummy electrodes 21a and 23b are formed at a very small interval which is almost invisible to human eyes as described above. The gaps are visible and do not impair the appearance.

In the liquid crystal display device of the above embodiment, of the dummy electrodes 21 and 23 provided on both substrates 1 and 2, the large area dummy electrodes corresponding to regions other than the lead portion wiring region of the other substrate are provided. The auxiliary dummy electrodes 23c provided on the front substrate 2 and the linear dummy electrodes 21b of one of the dummy electrodes 21 provided on the rear substrate 1 face each other. Among the opposing dummy electrodes, the large-area dummy electrode 23a of the front substrate 2
Are connected to the scanning electrodes 5 in the first row as shown in FIG. 6, and the auxiliary dummy electrodes 23c are connected to the lead portions 5a of the scanning electrodes 5 in the last row as shown in FIG. Even when static electricity is externally applied to the portions of the two substrates 1 and 2 where the dummy electrodes 21 and 23 face each other, the charges can be released via the scanning electrodes 5 or the lead portions 5a thereof, Therefore, abnormal lighting due to static electricity can be suppressed.

That is, in the conventional liquid crystal display device shown in FIGS. 8 to 15, the dummy electrodes 13 and 14 opposed to each other with the liquid crystal layer having a high specific resistance interposed therebetween are different from the display electrodes and their lead portions. Since the floating electrode is a non-ground floating electrode that is electrically separated, when static electricity is generated by rubbing the element surface or the like, the electric charge stays on the dummy electrodes 13 and 14,
Abnormal lighting due to the influence of static electricity occurs, and the abnormal lighting state continues for a long time.

On the other hand, in the liquid crystal display device of the above embodiment, the large-area dummy electrodes 21 opposed to each other with the liquid crystal layer interposed therebetween.
a, 23a, among the auxiliary dummy electrodes 23c and the linear dummy electrodes 21b, the large-area dummy electrodes 23a of the front substrate 2
And the auxiliary dummy electrode 23c are connected to the scanning electrode 5 or the lead portion 5a thereof, so that even if static electricity is applied from the outside, the electric charge that tends to stay in the large area dummy electrode 23a and the auxiliary dummy electrode 23c of the front substrate 2 Can be released via the lead portion 5a of the scanning electrode 5.

Therefore, according to this liquid crystal display device,
Abnormal lighting due to static electricity hardly occurs at the portion where the dummy electrodes 21 and 23 of both substrates 1 and 2 face each other, and even when abnormal lighting due to static electricity occurs, the abnormal lighting disappears instantaneously.

The liquid crystal display device of the above embodiment has a dot matrix display area A and a segment display area B.
However, the present invention can be applied to a liquid crystal display element having only the dot matrix display area A and a liquid crystal display element having only the segment display area B.

[0084]

According to the liquid crystal display element of the present invention, a dummy electrode is provided on the inner surface of at least one of the substrates so as to correspond to the non-display area other than the display area where the display electrodes of both substrates face each other. A portion of the dummy electrode corresponding to the lead portion wiring region of the other substrate is divided into a plurality of electrically floating electrodes, and each of the divided floating electrodes is provided on a display provided on the other substrate. Since only the lead portion of one of the electrodes is opposed to the lead portion of the display electrode, the dummy electrode makes the wiring pattern of the lead portion of the display electrode difficult to see, thereby improving the external appearance. A good display without abnormal lighting can be obtained by preventing the generation of an electric field that changes the alignment state of liquid crystal molecules between the dummy electrode of one substrate and the lead portion of the other substrate. .

In the liquid crystal display device according to the present invention, if the dummy electrodes are provided on the inner surfaces of both substrates, the patterns of the lead portions of both substrates are made less visible and the appearance can be further improved.

In the case where the dummy electrodes are provided on both substrates as described above, a portion of the dummy electrodes provided on one of the substrates, which corresponds to the dummy electrode in a region other than the lead portion wiring region of the other substrate, is removed. If the dummy electrodes are electrically connected to the display electrodes of the substrate on which the dummy electrodes are provided or the lead portions thereof, even when static electricity is externally applied to a portion where the dummy electrodes of both substrates face each other, the charge is displayed on the display. Since it can escape to the electrode for use or its lead portion, abnormal lighting due to static electricity can be suppressed.

[Brief description of the drawings]

FIG. 1 is a front view of a rear substrate of a liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is a front view of a front substrate of the liquid crystal display element.

FIG. 3 is an enlarged view of a part III in FIG. 1;

FIG. 4 is an enlarged view of a section IV in FIG. 1;

FIG. 5 is an enlarged view of a portion V and a portion VI in FIG. 1;

FIG. 6 is an enlarged view of a VI section in FIG. 1;

FIG. 7 is an enlarged cross-sectional view of the liquid crystal display element taken along the line XV-XV in FIG.

FIG. 8 is a front view of a conventional liquid crystal display element.

FIG. 9 is a plan view of a rear substrate of a conventional liquid crystal display element.

FIG. 10 is a front view of a front substrate of a conventional liquid crystal display element.

FIG. 11 is an enlarged view of a portion XI in FIG. 9;

FIG. 12 is an enlarged view of a part XII in FIG. 9;

FIG. 13 is an enlarged view of a portion XII in FIG. 10;

FIG. 14 is an enlarged view of a part XIV in FIG. 10;

FIG. 15 is an enlarged cross-sectional view of the conventional liquid crystal display element taken along line XV-XV in FIG. 11;

[Explanation of symbols]

 A: Dot matrix display area B: Segment display area 3: Signal electrode 3a: Lead part 4: Segment electrode 4a: Lead part 5: Scan electrode 5a: Lead part 22: Common electrode 21, 23 ... Dummy electrode 21a, 23a: Large Area dummy electrodes 21b, 23b ... linear dummy electrodes 23c ... auxiliary dummy electrodes

Claims (5)

[Claims] 1. A display area in which display electrodes are provided on inner surfaces of a pair of substrates opposed to each other with a liquid crystal layer interposed therebetween, and display electrodes of both substrates are opposed to each other on the inner surface of at least one of the substrates. Dummy electrodes are provided corresponding to non-display areas other than the display area. Of the dummy electrodes, a portion corresponding to the wiring area of the lead portion of the other substrate is divided into a plurality of electrically floating electrodes. And these divided floating electrodes are
A liquid crystal display element characterized in that the liquid crystal display element is opposed only to a lead portion of one of the display electrodes provided on the other substrate. 2. Dummy electrodes are provided on the inner surfaces of both substrates, respectively, and correspond to dummy electrodes in a region other than the lead portion wiring region of the other substrate among the dummy electrodes provided on one of the substrates. The liquid crystal display element according to claim 1, wherein the portion to be electrically connected to the display electrode of the substrate provided with the dummy electrode or a lead portion thereof. 3. It has at least a segment display area,
Of the one substrate provided with the plurality of display segment electrodes and the other substrate provided with the display common electrode opposed to the segment electrode, the inner surface of the other substrate includes the segment display area. A dummy electrode corresponding to a non-display area other than a display area in which the segment electrode and the common electrode face each other, and a portion of the dummy electrode corresponding to the lead wiring area of the one substrate includes Of the segment electrodes are divided into floating electrodes respectively opposed to the lead portions of one of the electrodes, and on the inner surface of the one substrate, except for the formation region of the segment electrodes and the wiring region of the lead portion,
3. The liquid crystal display device according to claim 1, wherein a dummy electrode corresponding to the non-display area is provided. 4. A part of the dummy electrode provided on the other substrate corresponding to a region other than a lead wiring region of the one substrate is an electrode integrated with a common electrode provided on the other substrate. The liquid crystal display device according to claim 4, wherein 5. A substrate having at least a dot matrix display area and provided with a plurality of display signal electrodes extending in one direction, and a plurality of scanning electrodes extending in a direction substantially orthogonal to the signal electrodes. Of the other substrate, on the inner surface of the one substrate, except for the signal electrode formation region and the wiring region of its lead portion, the plurality of scanning electrodes and signal electrodes of the dot matrix display area A dummy electrode corresponding to a non-display area other than a display area opposed to the non-display area is provided. And a portion corresponding to a lead portion wiring area of the other substrate among the dummy electrodes of the one substrate is a part of the plurality of scanning electrodes. One of the dummy electrodes on the other substrate is divided into a plurality of floating electrodes respectively opposed to the lead portion of one electrode, and a portion corresponding to a lead portion wiring region of the one substrate is formed of 3. The semiconductor device according to claim 1, wherein the plurality of floating electrodes are divided into a plurality of floating electrodes facing the lead portions of one of the electrodes.
3. The liquid crystal display device according to item 1.