JP3312802B2 - Manufacturing method of liquid crystal display element - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a liquid crystal display device using a substrate having electrodes having a desired pattern.

[0002]

2. Description of the Related Art Conventionally, a liquid crystal display device has a first substrate having an electrode patterned in a stripe shape, a letter shape or other desired shape, and a display electrode of the first substrate in combination with a dot. And a second substrate having electrodes patterned in a shape that allows the display of a pattern of a desired shape, such as the shape of a letter, and a seal. Liquid crystal is sandwiched, and display is performed at the intersection of both display electrodes.

Recently, a high-definition dot matrix display has been widely used for this liquid crystal display device. For example, 6
Even if a liquid crystal display element of 40 × 400 dots, 640 × 480 dots, or the like is manufactured using a considerably large substrate, only about 2 to 4 pieces can be obtained from a set of substrates, and the number of common electrodes and segment electrodes is small. Therefore, it is difficult to adopt a structure in which terminals for external connection are collectively taken out on one substrate. For this reason, the inspection during lighting can be relatively easily performed by displacing the substrates.

On the other hand, small and medium-sized liquid crystal display elements having a duty ratio that is not so large as in the prior art can be used in a wider range.
There is a demand for more detailed display. These medium- and small-sized liquid crystal display elements are designed to produce a large number of liquid crystal display elements at once using a large substrate in view of productivity. In this case, since the size is small, several to several tens of liquid crystal display elements are formed on one set of substrates.

[0005]

When a large number of liquid crystal display elements are formed as described above, it is impossible to perform a lighting test unless the substrate is separated. If the inspection is performed after separation, the inspection is troublesome because the number is large, and the number of steps before the inspection increases. Therefore, if there is a defective product, waste increases, leading to a decrease in productivity. For this reason, there has been a demand for a manufacturing method capable of performing lighting inspection to some extent in a process as early as possible and having high productivity.

In particular, small and medium-sized liquid crystal display elements often adopt a structure in which terminals of the liquid crystal display element are provided only on one substrate in order to facilitate the incorporation thereof. In testing such small and medium-sized liquid crystal display elements, the common electrode and the segment electrode are led out side by side on the same terminal, so a configuration in which a voltage is applied by simply shorting the terminals is adopted. Can not. Even for such a liquid crystal display element,
There has been a demand for a manufacturing method capable of performing a lighting inspection before cutting and separating into individual liquid crystal display elements.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has a first substrate and a second substrate having electrodes patterned in a desired shape opposed to each other. A liquid crystal is sealed inside, and at least one electrode of the first substrate is connected to the second substrate by conductive connection between the upper and lower substrates, and is taken out as an external connection terminal at a terminal portion of the second substrate. In a method for manufacturing a liquid crystal display element,
An electrode of the first substrate connected to the second substrate is connected to a first auxiliary electrode provided in a truncated region of the first substrate, and at least a part of the electrode of the second substrate is connected to the second auxiliary electrode. Patterning is performed so as to be connected to the second auxiliary electrode formed in the truncated region provided in the extension of the terminal portion of the substrate. Using these substrates, liquid crystal is sealed, and after the inspection, the truncated region is formed. Provided is a method for manufacturing a liquid crystal display element, which comprises cutting and removing the liquid crystal display element to separate the liquid crystal display element.
You.

Also, every other electrode of the second substrate is connected to the second auxiliary electrode, and a plurality of liquid crystal display elements are formed on a pair of substrates. separating the liquid crystal display device of that provides a method of manufacturing a liquid crystal display element characterized.

In addition, the auxiliary electrode of each of these substrates is a terminal portion.
And auxiliary electrodes parallel to form sides, perpendicular to the terminal portion formation side,
A method for manufacturing a liquid crystal display element, comprising: a main auxiliary electrode to which a plurality of the auxiliary electrodes are connected; and a voltage being applied to a plurality of auxiliary electrodes simultaneously by applying a voltage to one location. you provide.

The liquid crystal display element of the present invention uses a substrate having electrodes formed in a desired shape, a liquid crystal is sealed inside, and a large number of electrodes are led out to terminals. Specifically, this electrode has In ₂ O ₃ —SnO ₂ (ITO), SnO ₂
Etc. can be used. Of course, this is chromium, non-transparent electrode and the like aluminum, a conductive film of an organic compound can also be used.

As the substrate, a known substrate such as glass or plastic is used. Electrode may be provided directly on the _{substrate, SiO 2, TiO 2, ZrO} 2 or the like of the inorganic film and a color filter, polyimide, polyamide, urethane, provided through the organic film such as silicon over emissions Is also good.

Further, if necessary, Si
O _{2, TiO 2,} ZrO ₂ or the like of the inorganic film and a color filter, polyimide, polyamide, urethane, an organic film such as a silicon over emissions provided. Further, rubbing or oblique deposition is performed as needed to form an alignment film.

A set of substrates used in the present invention has a structure in which at least one electrode of the first substrate is connected to the second substrate by conductive connection between the upper and lower substrates. In particular, by connecting all the electrodes of the first substrate to the second substrate by conductive connection between the upper and lower substrates,
Since connection to the outside only needs to be made from the second substrate, mounting is facilitated.

Normally, the electrode of the first substrate is used as a common electrode.
In the case of the duty drive, it is sufficient to provide eight lines. The electrode of the first substrate is usually routed to the vicinity of or inside the seal, and is patterned so as to be connected to the electrode for external connection of the second substrate. The connection between the substrates may be performed using an adhesive mixed with conductive particles or a conductive adhesive.

The substrates on which the electrodes have been patterned in this manner are arranged at a certain interval such that the electrode surfaces face each other to form a liquid crystal display element. Usually, the periphery of the substrate is sealed with a sealing material , and liquid crystal is injected from an injection port provided in a part of the sealing material . Thereafter, the injection port is sealed. Further, there is a manufacturing method in which pressure bonding of the sealing material and injection of the liquid crystal are simultaneously performed.

According to the present invention, the electrode of the first substrate connected to the second substrate is connected to the first auxiliary electrode provided in the cut-off region of the first substrate. And it is connected to the electrode of the second substrate through the conductive connection between the upper and lower substrates, and is drawn out to the terminal portion of the second substrate. The electrode of the second substrate connected to the electrode of the first substrate is not connected to a second auxiliary electrode formed in a truncated region of the second substrate described later.

At least a part of the electrode of the second substrate is formed of the second substrate.
Is connected to a second auxiliary electrode formed in a cut-off region provided in an extension of the terminal portion of the substrate. In this case, particularly in the case of a striped electrode, the electrode of the second substrate is one.
It is preferable to connect to the second auxiliary electrode every other book because a short circuit between adjacent electrodes can be inspected at the same time.

According to the present invention, when the present invention is applied to a method of manufacturing a large number of liquid crystal display elements at once using a large substrate, the effect is large. Therefore, the auxiliary electrode parallel auxiliary electrodes to the terminal portion forming the sides of each substrate, perpendicular to the terminal portion formation side, is to ensure that with the auxiliary electrode stem in which a plurality of the auxiliary electrode is connected preferable. By adopting such a configuration, it is possible to simultaneously apply voltages to a plurality of auxiliary electrodes by applying a voltage to one position of the auxiliary electrodes, thereby enabling inspection without cutting the substrate.

Then, a seal and a liquid crystal are sealed using such a substrate. Thereafter, a voltage is applied between the auxiliary electrodes of both substrates to perform a lighting inspection. As a result, inspection of a large number of liquid crystal display elements on one large substrate can be performed only once, and the productivity is good. Normally, it is sufficient to conduct conductive connection from the ends of both substrates, respectively. However, the conductive connection between the upper and lower substrates between the auxiliary electrodes at the ends may be collectively connected from one of the substrates and inspected.

By this inspection, short-circuiting between adjacent electrodes, partial disconnection, and other lighting failures can be easily performed and a large number of liquid crystal display elements can be almost simultaneously determined. After the inspection is performed, a cut-out area that is not required is cut and removed. Specifically, all the auxiliary electrodes of each substrate are removed.

The present invention will be described with reference to the drawings. FIG.
It is a plan view showing a pattern of the electrode of the substrate on the common side,
FIG. 2 is a plan view showing the pattern of the electrode on the segment side. For clarity, a striped pattern, and the number of electrodes also four are common electrodes, the segment electrode shows only five. In an actual device, the number of common electrodes is 1 to 32, and the number of segment electrodes is 10 to 320.
Often the book.

In these figures, three liquid crystal display elements are shown in a state of being arranged in the vertical direction. However, more liquid crystal display elements may be arranged in the vertical direction, and a plurality of liquid crystal display elements may be arranged in the horizontal direction. Good. For example, by arranging six in the vertical direction and two in the horizontal direction, 12 liquid crystal display elements can be manufactured simultaneously from one set of substrates. Similarly, by arranging 12 in the vertical direction and 3 in the horizontal direction, 36 liquid crystal display elements can be manufactured simultaneously from one set of substrates.

FIG. 1 shows electrodes 1A to 1 constituting a common electrode.
D is connected to the connection electrodes 2A to 2D, and at least a part thereof is connected to the auxiliary electrodes 4A, 4B,. In this case, every other electrode 1A to 1D is an auxiliary electrode 4A,
B,... Are preferably connected. That is, the electrode 1B,
1D is connected to the auxiliary electrodes 4A, 4B,.
1C is preferably not connected to the auxiliary electrodes 4A, 4B,. Thereby, a short circuit inspection between adjacent electrodes can be easily performed.

The auxiliary electrodes 4A, 4B,...
It is connected to the auxiliary electrode 5 of the trunk, which connects each auxiliary electrode almost perpendicularly to it. The trunk auxiliary electrodes are provided to connect the respective auxiliary electrodes and to be connected to all the auxiliary electrodes by conductive connection to one place.

Although the trunk auxiliary electrode 5 is provided in a region which is cut off along the cutting lines 6A to 6F in this example, it may be provided inside the liquid crystal display element. For example,
The connection electrode of the outermost electrode 1D may be extended in the opposite direction as it is, and the portions 7 and 8 in the drawing may be connected.

Reference numerals 3A to 3D in FIG. 1 denote transfers for establishing conduction between the upper and lower substrates of the electrodes 1A to 1D of the common-side substrate, and the electrodes 1A to 1D serve as connection electrodes 13A for the segment-side substrate. To 13D.

All of the common-side electrodes may be connected to auxiliary electrodes as necessary, or a single electrode may be used at a plurality of locations. Alternatively, the electrodes on the segment side may be wired once via a common-side substrate in a wiring relationship.

In FIG. 2, the electrode 11 on the segment side
A to 11E are connection electrodes 12A to 12E at their terminals.
E is drawn out and connected every other electrode to the auxiliary electrode 14A. The connection electrodes 13A to 13D of the segment-side substrate which are conductively connected by the transfer 3A to 3D from the electrodes 1A to 1D of the common-side substrate are the auxiliary electrodes 14
Not connected to A.

Each of the auxiliary electrodes 14A, 14B,... Is connected at its end to a main auxiliary electrode 15 which is substantially orthogonal to the auxiliary electrodes. The trunk auxiliary electrodes are provided to connect the respective auxiliary electrodes and to be connected to all the auxiliary electrodes by conductive connection to one place.

Although the trunk auxiliary electrode 15 is provided in a region which is cut off along the cutting lines 16A to 16F in this example, it may be provided inside the liquid crystal display element. For example, the connection electrode of the outermost electrode 11A may be extended in the opposite direction as it is, and the portions 17 and 18 in the drawing may be connected.

In this example, the terminals are provided only on one side of the substrate on the segment side of the liquid crystal display element. Therefore, the lowermost liquid crystal display element in FIGS. 1 and 2 is below the substrate on the segment side of the liquid crystal display element, the second liquid crystal display element from the bottom is upper side, and the third liquid crystal display element from the lower side. Each has a terminal portion formed on the lower side. For this reason, this auxiliary electrode is provided in parallel with the terminal portion for every two liquid crystal display elements.

If all electrodes are only striped electrodes,
If all the striped electrodes on the segment side are connected vertically, the substrate on the segment side may have only one auxiliary electrode. However, in this case, there remains a problem that it is difficult to specify a location such as a short circuit or a disconnection. For this reason, it is preferable that each liquid crystal display element is separately connected to the auxiliary electrode as in the example of FIG.

Further, some electrodes may be directly connected to the auxiliary electrodes of the trunk. For example, the common electrode may be pulled out in the lateral direction and directly connected to the trunk auxiliary electrode. In the example of FIG. 1, the electrodes 1A to 1D are extended to the left so as to be directly connected to the auxiliary electrode of the trunk. In this case, the transfer is provided not near the cutting line 6D but near the cutting line 6A. In the substrate on the segment side, the electrodes 13A to 13D are formed not in a stripe shape as in the example of FIG. 1 but in an L shape.

In the above example, the terminal portion of the liquid crystal display element is provided on only one side of the substrate on the segment side. However, it may be provided on both sides of the substrate on the segment side. Since the number of common electrodes is usually smaller than the number of segment electrodes, it is advantageous to provide terminals on the segment-side substrate because the number of transfers is small, but conversely, the common-side substrate A terminal portion may be provided.

In the process up to the inspection, the auxiliary electrode remains, and a voltage is applied through the auxiliary electrodes of both substrates. This makes it possible to perform a certain degree of inspection such as a short circuit or a disconnection in a state where a plurality of liquid crystal display elements are formed on a large substrate. Thereafter, the liquid crystal display element having no abnormality is separated into individual liquid crystal display elements. After this disconnection, the auxiliary electrode that has shorted the electrode is cut off, so that it functions as a normal liquid crystal display element.

The electrodes 1A to 1D on the common side in the above example are:
Are separated from the auxiliary electrodes 4A, 4B,... And the auxiliary electrode 5 on the trunk, and are supplied with a voltage from terminals connected to the electrodes 13A to 13D on the segment side through the transfer 3A to 3D. Also, the segment side electrode 11A
11E are separated from the auxiliary electrodes 14A, 14B,... And the auxiliary electrode 15 of the trunk, and are supplied with a voltage from terminals connected to the electrodes 12A to 12E.

In the above example, for the sake of clarity, both the segment side electrode and the common side electrode are shown as striped electrodes, and the numbers thereof are shown as five and four, respectively. However, in an actual liquid crystal display element, more electrodes are used. The present invention is usually used for a liquid crystal display device in which terminals are formed only on one substrate as described at the outset,
It is suitable for small and medium-sized liquid crystal display elements in which a large number of liquid crystal display elements are formed on one set of substrates. Therefore, in the case of the dot matrix type, for example, 160 × 16, 240
× 32, 320 × 64, etc. In addition, the display of the date, the bar graph display, the symbol graphic display, and the like can be used.

The present invention relates to a normal TN type liquid crystal display element,
Liquid crystal twist angle of 180 to 360 ° STN (super twisted Ted nematic) type liquid crystal display element, but is applied to GH containing a dichroic dye (guest-host) type liquid crystal display element or the like, other modes of May be applied to the liquid crystal display device.

A polarizing plate, a retardation plate, a reflecting plate, a light source and the like are used in combination with the liquid crystal display element manufactured as described above, if necessary. Further, if necessary, a color filter, a light-shielding film, or the like may be formed inside or outside the substrate. In the case of a liquid crystal display element other than the liquid crystal display element, various members and parts can be added and used as needed.

[0040]

EXAMPLES Example 1 I was placed on a soda glass substrate undercoated with SiO _2.
A transparent electrode made of TO is formed, and the pattern is as shown in FIGS. 1 and 2, provided that the number of electrodes is 16 on the common side,
80 dot display on the segment side and 4 on the common side
Eight patterns in the vertical direction and two in the horizontal direction were arranged on a large-sized substrate, with patterns each having 40 character and graphic display portions on the book and segment sides.

An auxiliary electrode is provided between the liquid crystal display elements, and one end is connected to the auxiliary electrode of the trunk. Each display electrode was connected to an auxiliary electrode every other line arranged in the terminal portion. However, unlike the examples of FIGS. 1 and 2, the auxiliary electrodes of the trunk are arranged so as to pass through the center of the substrate.
That is, the auxiliary electrodes extend to both sides of the auxiliary electrode of the trunk, and the liquid crystal display element is connected.

An SiO ₂ insulating film was formed on the substrate with electrodes, and a polyimide film was further formed. Rubbing was performed and an alignment treatment was performed. This one substrate is screen-printed with a sealant, the other substrate is screen-printed with an adhesive containing conductive particles for transfer, and superimposed so that the electrode surfaces are opposed to each other, and pressed to form a space inside. An empty cell was formed.

Nematic liquid crystal was injected into the empty cell through an opening formed in the sealing material, the opening was sealed with a sealing material, and a voltage was applied to the auxiliary electrodes at the ends of both substrates. At this time, if a pair of polarizing films were arranged above and below, a lighting test could be easily performed. As a result, it was possible to determine the presence or absence of a short circuit between adjacent electrodes for all of the 16 liquid crystal display elements by one operation, and it was also possible to determine about half the disconnection of the electrodes.

Thereafter, only the non-defective product was cut off, separated from the auxiliary electrode and the trunk auxiliary electrode, separated into individual liquid crystal display elements, and polarizing films were arranged on both sides to complete a TN type liquid crystal display element. . This liquid crystal display device could be connected and operated in the same manner as a normal liquid crystal display device.

Example 2 A liquid crystal display element was manufactured in the same manner as in Example 1, except that the common side auxiliary electrode was connected by connecting the electrodes 7 and 8 in FIG. did. In this case, the auxiliary electrode on the common side trunk remains in the liquid crystal display element, but does not affect the display. In this case as well, the lighting test was possible as in the first embodiment, and there was no problem in the operation after cutting.

Example 3 A liquid crystal display element was manufactured in the same manner as in Example 1 except that the auxiliary electrodes on the common side and the segment side were provided near the seal of the liquid crystal display element. In this case, the trunk auxiliary electrode remains near the bottom of the seal in the liquid crystal display element, but does not affect the display. When referring to the examples of FIGS. 1 and 2, the positions of the cutting lines 6A and 16A are the auxiliary electrodes 5 of the trunk,
You can think of it as being on the left side of 15. In this case as well, the lighting test was possible as in the first embodiment, and there was no problem in the operation after cutting.

Example 4 The number of electrodes was increased so that terminal portions were formed on both sides of one substrate, and auxiliary electrodes were formed on both sides of each liquid crystal display element. When referring to the examples of FIGS. 1 and 2, it is assumed that the cutting lines 6 </ b> E and 16 </ b> E disappear, and the display electrode of one liquid crystal display element is divided into two and drawn to the upper and lower terminal portions. Just look. In this case as well, the lighting test was possible as in the first embodiment, and there was no problem in the operation after cutting.

Example 5 A 6 × 1 dot matrix type pattern was formed on a set of substrates. At this time, one trunk auxiliary electrode was provided on each of the left and right sides. The auxiliary electrode connected to the odd-numbered electrode on the common side is connected to the left-side stem auxiliary electrode, and the auxiliary electrode connected to the even-numbered electrode is connected to the right-side stem auxiliary electrode.

The segment side connects the electrodes of the two liquid crystal display elements, the odd-numbered electrodes are connected to the upper auxiliary electrode,
Further, this was connected to the auxiliary electrode on the left stem, the even-numbered electrode was connected to the lower auxiliary electrode, and further connected to the auxiliary electrode on the right stem.

Referring to the example of FIG. 2, the electrodes facing each other across the cutting line 16E are connected. The odd-numbered electrodes 11A, 11C, 11E,... Are connected to the upper auxiliary electrode 14A, and are further connected to the left trunk auxiliary electrode 15A.
Connected to. The even-numbered electrodes 11B, 11D,... Are connected to the lower auxiliary electrode 14B, which is not connected to the left auxiliary electrode 15 but is connected to the right auxiliary auxiliary electrode 15 (not shown). Is done.

As a result, since all the electrodes are drawn out, short-circuiting and disconnection between adjacent electrodes can be completely inspected.

[0052]

According to the liquid crystal display device of the present invention, since the display electrodes of the liquid crystal display device are connected to the auxiliary electrodes, the inspection by the lighting of the short circuit and the disconnection can be performed without cutting the individual liquid crystal display devices. Easy. Since only the non-defective products need to be cut and manufactured, the productivity is high. Of course, at this time, the defective product can be repaired and then flown. Also, after being cut into individual liquid crystal display elements,
It can be used similarly to a conventional liquid crystal display device.

By alternately connecting the display electrodes to the auxiliary electrodes, it is possible to easily determine whether there is a short circuit between adjacent electrodes. The present invention can be applied to various applications within a range that does not impair the effects of the present invention.

[Brief description of the drawings]

FIG. 1 is a plan view showing an electrode pattern on a common-side substrate according to the present invention.

FIG. 2 is a plan view showing an electrode pattern of a segment-side substrate according to the present invention.

[Explanation of symbols]

 Electrodes: 1A to 1D, 11A to 11E Connection electrodes: 2A to 2D, 12A to 12E Transfer: 3A to 3D Auxiliary electrodes: 4A, 4B, 14A, 14B Trunk auxiliary electrodes: 5, 15 Cutting lines: 6A to 6F , 16A-16F

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Tokihito Sawada 3-14-9 Yushima, Bunkyo-ku, Tokyo Within Optrex Corporation (56) References JP-A-4-324825 (JP, A) JP-A-Hei 2-222925 (JP, A) JP-A-4-198914 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G02F 1/1345

Claims (3)

(57) [Claims] A first substrate having a common electrode patterned in a desired shape and a second substrate having a segment electrode orthogonal to the common electrode are opposed to each other, and liquid crystal is sealed therein; At least one electrode of the substrate is connected to the second substrate by conductive connection between the upper and lower substrates, and the terminal portion of the second substrate is taken out as an external connection terminal. The electrode of the first substrate connected to the first substrate is connected to the first auxiliary electrode provided in the cut-off region of the first substrate, and at least a part of the electrode of the second substrate is connected to the second substrate. Connected to a second auxiliary electrode formed in a truncated area provided in an extension of the terminal portion, wherein the substrate has at least two immediately adjacent liquid crystal display element forming portions, and these immediately adjacent liquid crystal display elements are formed. Between formations Patterning is performed so that at least one segment electrode or common electrode is connected across the disconnection, a liquid crystal is sealed using these substrates, and the common electrode or segment electrode connected in the liquid crystal display element forming portion is formed. After the test using as a test auxiliary electrode,
A method for manufacturing a liquid crystal display element, comprising cutting and removing a truncated region to separate the liquid crystal display element. 2. An electrode of a second substrate is connected to a second auxiliary electrode every other electrode. A plurality of liquid crystal display elements are formed on a pair of substrates, and after performing a lighting inspection, each individual The method for manufacturing a liquid crystal display element according to claim 1, wherein the liquid crystal display element is separated into liquid crystal display elements. 3. The auxiliary electrode of each substrate is composed of an auxiliary electrode parallel to the terminal portion forming side and a trunk auxiliary electrode connected to the plurality of auxiliary electrodes at right angles to the terminal portion forming side. The auxiliary electrode is formed of an electrode that straddles a cutting line between the immediately adjacent liquid crystal display element formation portions, and is capable of simultaneously applying a voltage to a plurality of auxiliary electrodes by applying a voltage to one place. A method for manufacturing a liquid crystal display device according to claim 1.