JPH0362016A - Production of liquid crystal display device - Google Patents

Abstract

PURPOSE:To prevent the orientation defect of liquid crystal molecules by static electricity and the generation of display defects by previously providing common peripheral electrodes around two arrays of band-shaped electrode groups apart the spacing of <=1/2 the shortest spacing between the individual band-shaped electrode groups. CONSTITUTION:The common peripheral electrodes 13 of two arrays of the band-shaped electrode groups 11, 12 on a substrate are previously provided in proximity apart the spacing H of <=1/2 the shortest spacing between the individual band-shaped electrodes constituting the band-shaped electrode groups 11, 12. In addition, the common peripheral electrodes 13 are concealed by adhesive seals. The spacing with the common peripheral electrodes 13 is smaller than the spacing between the adjacent band-shaped electrodes and, therefore, a discharge is generated in the spacing with the common peripheral electrodes 13 when a potential difference is generated between the adjacent band-shaped electrodes by the electrification of static electricity. The generation of the discharge in the display part and the orientation defect of the liquid crystal occurring therein are prevented in this way.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) The present invention relates to manufacturing a liquid crystal display device in which liquid crystal is filled (sandwiched) between two substrates each having display electrodes facing each other. Regarding the method.

(Prior Art) Generally, a liquid crystal display device has a structure in which a liquid crystal is sandwiched between two substrates, such as glass, on which transparent display electrodes are formed.

Among such liquid crystal display devices, in particular, in a dot matrix type liquid crystal display device, parallel band-shaped electrode groups each consisting of a plurality of electrodes are formed on two glass substrates, and these band-shaped electrode groups are connected to each other. It has a structure in which two glass substrates are placed facing each other so as to intersect at right angles. In order to drive more pixels with a limited duty ratio, the electrode group on one substrate is divided into two in the longitudinal direction (perpendicular to the arrangement direction) as shown in Figure 5. Attempts have been made to create a structure in which the electrodes are divided into two rows of strip-shaped electrode groups 1.2 and arranged facing each other at a predetermined distance on a glass substrate 3.

In addition, each band-shaped electrode group 1.2 and each band-shaped electrode 1a, 1b, lc, ... and 2a that constitute these
.

2b, 2c, . . . are composed of a display portion 4 and a terminal portion 5, and each of the strip electrodes 1a, lb, 1c, .
a, 2b, 2c, . . . are arranged parallel to each other at least in the display section 4.

(Problems to be Solved by the Invention) However, in a liquid crystal display device using a glass substrate configured in this manner, there is a problem in that display defects are caused by static electricity generated during the manufacturing process. For example, in a TN type (twisted nematic) liquid crystal display device, an alignment process is performed on the substrate during the manufacturing process in order to align the liquid crystal molecules in a fixed direction. The rubbing method has been used since then. During this rubbing process, static electricity is generated due to the friction between the glass substrate 3 and cloth such as chemical fiber, and this static electricity causes minute spark discharges between the strip-shaped electrodes of the display section 4 that are arranged close to each other. This occurs, and a portion of the alignment film near the discharge portion is often thermally destroyed. As a result, the force for aligning liquid crystal molecules in the vicinity of the discharge portion is reduced, resulting in poor alignment and impaired display contrast.

In order to eliminate these drawbacks, as shown in Figure 6,
A common electrode 6 is provided on the periphery of the band-shaped electrode group 1.2 on the glass substrate 3, or a common electrode is provided on the side surface of the substrate (described in Japanese Patent Application Laid-Open No. 81-298330), and all the band-shaped electrode groups 1.
．． It has been widely developed to manufacture a liquid crystal display device free from display defects by using a short-circuited electrode 2 and removing the common electrode 6 after rubbing.

However, in the liquid crystal display device obtained by these methods, there is a problem that it is not possible to electrically inspect, for example, whether there is a short circuit between adjacent strip electrodes in the display section 4 at the time of forming the strip electrodes. .

The present invention has been made to solve these problems, and it is possible to prevent alignment defects of liquid crystal molecules due to static electricity generated in the rubbing process, etc., and also to prevent the electrical conductivity of each band-shaped electrode appropriately formed at the time of forming the band-shaped electrode. An object of the present invention is to provide a method for manufacturing a liquid crystal display device that can be inspected.

[Structure of the Invention] (Means for Solving the Problems) The present invention provides two substrates with display electrodes, each of which has two rows of parallel strip-shaped electrode groups facing each other on at least one surface thereof. In the method for manufacturing a liquid crystal display device, the two rows on the one substrate are arranged facing each other and spaced apart, adhesive-sealing the peripheral portions, and filling (sandwiching) liquid crystal between the display electrode surfaces. A common peripheral electrode is provided near the periphery of the jt)-shaped electrode group at a distance of 172 or less, which is the shortest distance between the individual strip-shaped electrodes constituting the above-mentioned 4;)-shaped electrode group, and the common peripheral electrode is Hiding the electrode with an adhesive seal, or providing a common peripheral electrode around the two rows of band-shaped electrode groups on the one substrate, and forming one band-shaped electrode constituting the band-shaped electrode group or its band-shaped electrode. One of the band-shaped electrodes arranged facing each other on the longitudinal extension line is connected to the common peripheral electrode, and the other band-shaped electrode is connected to the common peripheral electrode at a distance narrower than the distance between the adjacent band-shaped electrodes. placed close to the common peripheral electrode,
The method for manufacturing a liquid crystal display device is characterized in that such electrode arrangement is alternately repeated along the arrangement direction of the band-shaped electrode group, and the common peripheral electrode is hidden with an adhesive seal.

(Function) By using the display electrode-equipped substrate with the above configuration, if a potential difference occurs between adjacent strip electrodes of the strip electrode group formed on the substrate due to static electricity generated during the substrate rubbing process, the display Since the interval between adjacent strip electrodes in the terminal section via the common peripheral electrode is smaller than the interval between adjacent strip electrodes in the terminal section, discharge occurs in the gap with the common peripheral electrode, and discharge occurs in the display section and is caused by this. This prevents poor alignment of liquid crystals. Further, since adjacent strip electrodes are electrically insulated and are independent from each other, electrical inspections such as short circuits and disconnections between strip electrodes can be performed.

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

FIG. 1 is an enlarged plan view showing a substrate with display electrodes used in an embodiment of the manufacturing method according to the present invention.

As is well known, in a liquid crystal display device, two glass substrates each having a transparent display electrode formed of, for example, an ITO film (indium oxide film) on opposing surfaces are arranged facing each other at a predetermined distance. The glass substrate has a structure in which the peripheral edge of the glass substrate is fixed with an adhesive layer seal, and the gap formed is filled (sandwiched) with liquid crystal.

In the present invention, a glass substrate having a transparent display electrode configured and provided as shown below is used as at least one display electrode-equipped substrate. That is, as shown in FIG.
, lie, .
This constitutes a first row of band-shaped electrode groups 11. Also, each strip electrode 11a of the strip electrode group 11.

A plurality of strip electrodes 12a, 12b, 12c, .
, 12c, . . . constitute a second row of strip-shaped electrode group 12.

Further, on the periphery of the glass substrate 3, each strip electrode 11a, llb, 1l of the two rows of strip electrode groups 11.12 is provided.
A U-shaped common peripheral electrode 13 is formed of an ITO film at an interval (H) of 8 μm from the terminal portions of C1 . . . and 12a, 12b, 12c, . The spacing (H) here and each strip electrode 11a, llb, l
lc, ... and 12a, 12b, 12c, --
The relationship between the interval (D) and the interval (E) between the strip electrode groups 11 and 12 is set as (D) > (E) > (H).

In the manufacturing process of a liquid crystal display device using the glass substrate 3 configured in this way, for example, during alignment treatment by rubbing, static electricity generated by friction is charged on the strip electrodes, and between the strip electrodes adjacent in the arrangement direction, For example, when a potential difference occurs between lla and llb, the distance between the terminal portion of each strip electrode and the common peripheral electrode 13, for example, the sum of PAIP^2, is greater than the distance D (30 μ) between the display portions of the strip electrodes. 2XI (16μ) is smaller, so the strip electrode 11
Discharge occurs in two gaps between the terminals a and 11b and the common peripheral electrode 13.

Also, longitudinally adjacent strip electrodes, for example lla and 1
2c, the sum of the distances between the strip electrode terminal portions via the common peripheral electrode 13 is greater than the distance E between the display portions, 2c.
Since PA is smaller, there are two PAs between each strip electrode 11a, 12a and the common peripheral electrode 13.

A discharge occurs in the gap between Plh and Plh.

In the glass substrate equipped with display electrodes in this way,
Discharge in the display portion of the band-shaped electrode groups 11 and 12 and a decrease in the alignment force of the liquid crystal caused by this are prevented, and the possibility of display defects is completely eliminated.

In addition, in the case of the glass substrate with display electrodes of this embodiment, all the (;)-shaped electrodes 11a, 12a, etc. that constitute the band-shaped electrode group 11.12 formed on the surface of the glass substrate 3 are electrically independent from each other. Therefore, it is possible to easily conduct electrical inspections such as short circuits and disconnections between the respective Si-shaped electrodes adjacent in the arrangement direction and the longitudinal direction by using a method such as using a probe. Moreover, since the 13 parts of the conductive peripheral electrodes are hidden during the adhesive sealing process, not only does the troublesome process of completely removing the conductive peripheral electrodes 13 become unnecessary, but also there is no adverse electrical effect during use. is also prevented.

Next, another manufacturing method according to the present invention will be explained. FIG. 2 is a plan view showing the electrode arrangement (configuration) of the glass substrate with display electrodes used.

In this embodiment, a plurality of strip electrodes 11a, ll
b', llc', ..., 12a', 12b', 12
c',... are 30μ apart at the shortest point (D)
Two rows of strip electrode groups 11' and 12' are arranged parallel to each other at least in the display section, with the display section 4 of each strip electrode facing each other with an interval (E) of 20 μ. It is located.

Further, a common peripheral electrode 13' is located around the glass substrate 3.
It is formed of a TO film. Then, for example, the odd numbered “1” strip electrode 11a from the left in the first row of strip electrode group IF.
', lIc', ... and these electrodes 11a', l
12° of the second row of band-shaped electrodes not facing le',...
The even-numbered strip electrodes 12b', 12d', . . .
Each is connected to a common peripheral electrode H'' at a terminal portion,
Electrodes other than these, that is, even-numbered electrodes 11b', lId'... of the first row of strip-shaped electrode groups 1F, and odd-numbered electrodes 12a', 12c' of the second row of strip-shaped electrode groups 12°
... are arranged close to each other with an interval of 10μ (11〉) between each terminal portion and the common peripheral electrode 13'.

In this case as well, as in the first embodiment, the interval (11) and each boat-shaped electrode 11a'', llb'... and 12a',
12b',... and the spacing (D) of the boat-shaped electrode groups 11', 1
The relationship with the 2° interval (E) is (D) > (E) >
(H).

When using a substrate with display electrodes configured in this way,
For example, static electricity generated during the rubbing process may cause damage to occur between adjacent strip-shaped electrodes in the arrangement direction, for example, the first electrode 11a'.
When a potential difference occurs between the electrode 11b and the second electrode 11b, the terminal part of the electrode 11b'' with the narrowest insulation interval and the common peripheral electrode 13
A discharge occurs in PA2 between . Also, between longitudinally adjacent strip electrodes, for example, between the first electrodes 11 in the first row.
When a potential difference occurs between a' and the first electrode 12a' of the second row, the terminal part of the first electrode 12a' of the second row, which has the narrowest insulation interval, and the common peripheral electrode 13° Between P
A discharge occurs at B+. After the rubbing process is completed and the adhesive sealing process is completed, the common peripheral electrode 13° is separated by a method such as cutting off the end of the glass substrate 3, and the common peripheral electrode 13 By electrically connecting and separating the two electrodes, it is possible to obtain a substrate with display electrodes for configuring a liquid crystal display device that does not cause display defects. Moreover, in the configuration of the display electrodes, since the strip electrodes adjacent in the arrangement direction and the longitudinal direction are both insulated and electrically independent, each strip electrode can be electrically connected without removing the common peripheral electrode 13°. In this electrical test, since half of the strip electrodes are connected to the common peripheral electrode 13', the number of test probes can be reduced to 1/2.

In addition, as in the previous embodiment, the 13° portion of the common peripheral electrode is hidden during the adhesive sealing process, which not only eliminates the troublesome process of completely removing the 13° common peripheral electrode, but also eliminates the need for the troublesome process of completely removing the 13° common peripheral electrode. The negative electrical effects of this are also prevented.

Furthermore, FIG. 3 is a plan view of a glass substrate with display electrodes used in another example, and shows a band-shaped electrode f! $1
Some of the strip electrodes 11a', 11c', -- and 12b', 12d', -- among the strip electrodes 1', 12', respectively.
. . and the common peripheral electrode 13' are connected, and the basic structure, operation, and effect are the same as those shown in FIG. 2. However, in this example, the island-like electrode groups 11', 1
2, the strip-shaped electrodes 11a'llb' and 11c' respectively
, 12a, 12b', 12c', . . . and the common peripheral electrode 13 are configured to protrude outward from the surface of the glass substrate. Therefore, after completing the process of manufacturing a required liquid crystal display device, that is, the process of applying a rubbing process to the surface with display electrodes and adhesion sealing, the terminal portions such as the strip-shaped electrodes 11a protruding outward from the surface of the glass substrate are completed. Then, the common peripheral electrode 13' is separated by cutting off the glass substrate 3 or the like. By electrically connecting and separating the band-shaped electrode groups 11', 12' and the common peripheral electrode 13° in this manner, a substrate with display electrodes for a liquid crystal display device structure that does not cause display defects can be obtained. In addition, in these embodiments, as shown in FIG.
3 or 13' and the region closest to the strip-shaped electrode terminal portion should protrude at an acute angle to facilitate the generation of discharge between this region and the strip-shaped electrode terminal portion.

In addition, in the above embodiment, two glass substrates 3 are arranged facing each other.
, 3 has been described, but the other substrate disposed opposite thereto may be configured in the same manner if necessary. Furthermore, it can also be applied to the manufacture of multi-panel type liquid crystal display devices in which a plurality of individual patterns are arranged on a dedicated glass surface.

[Effects of the Invention] As explained above, according to the method for manufacturing a liquid crystal display device of the present invention, it is not only possible to conduct electrical inspections such as short circuits of electrodes during the manufacturing process, but also to check whether the liquid crystal display is damaged due to static electricity generated during the manufacturing process. This eliminates the occurrence of molecular misalignment,
The occurrence of display defects is prevented. Furthermore, electrical inspections such as short circuits between the strip electrodes constituting the display electrodes can be easily performed during the manufacturing process, resulting in many advantages in terms of manufacturing yield and quality control.

[Brief explanation of drawings]

FIG. 1 is a plan view of one glass substrate example used in the manufacturing method according to the present invention, FIGS. 2 and 3 are plan views of one glass substrate used in other examples, and FIG. FIGS. 5 and 6, which are partially enlarged views of the substrate used in the manufacturing method according to the invention, are plan views of the substrate used in the manufacturing of the conventional liquid crystal display device, respectively. 3...Glass substrate 11.12. ll', 12°...Strip electrode group +1a,
Ilb, llc (Ila', Ilb', lle')-
Strip electrodes 12a, 12b, 12c, (12a'
, 12b', 12c') - strip electrode 13.13
'... Common peripheral electrode 14... Adhesive seal

Claims (2)

[Claims] (1) Two display electrode-equipped substrates each having two rows of parallel strip-shaped electrode groups facing each other on the surfaces of at least one of them,
In the method for manufacturing a liquid crystal display device, the display electrode surfaces are opposed and spaced apart, the peripheral portion is adhesive-sealed, and liquid crystal is filled between the display electrode surfaces, the two rows on the one substrate. A common peripheral electrode is provided around the band-shaped electrode group at a distance of 1/2 or less of the shortest distance between the individual band-shaped electrodes constituting the band-shaped electrode group, and the common peripheral electrode is hidden. 1. A method for manufacturing a liquid crystal display device, which comprises adhesively sealing the display device so as to seal the liquid crystal display device. (2) Two substrates with electrodes each having two rows of parallel strip-shaped electrode groups formed on at least one surface facing each other are arranged with display electrode surfaces facing each other and spaced apart, and the peripheral portions are adhesive-sealed, and the peripheral portions are adhesive-sealed. In the method of manufacturing a liquid crystal display device in which a liquid crystal is filled between display electrode surfaces, a common peripheral electrode is provided around the two rows of strip electrode groups on the one substrate, and one of the strip electrode groups constituting the strip electrode group is Either one of the strip-shaped electrodes of the book or strip-shaped electrodes arranged facing each other on the longitudinal extension line of the strip-shaped electrodes is connected to the common peripheral electrode, and the other strip-shaped electrode is connected to the strip-shaped electrode arranged adjacently. The common peripheral electrodes are arranged close to each other at intervals narrower than the mutual intervals, and this electrode arrangement is alternately repeated along the arrangement direction of the band-shaped electrode group, and the common peripheral electrodes are hidden. 1. A method for manufacturing a liquid crystal display device, which comprises adhesively sealing the display device.