JP2000323274A - El display - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate a line unnaturally dividing a screen even from a large screen display and provide the screen easy to watch by connecting one end of a conductor to a hole penetrating a substrate and electrically connecting it to electrodes. SOLUTION: In an EL display, an ITO electrode 3 is formed on a glass substrate 2, a hole 6 penetrating through the glass substrate 2 is provided in the end of the glass substrate 2, and a conductor 4 is provided thereto to be connected to the ITO electrode 3. The thickness of the conductor 4 can be set to extremely fine, for example, 0.3 mm so that, if the conductor 4 is connected to the output side of the IC and when a liquid crystal display is manufactured using a plurality of substrates, it is thoroughly possible that the width not contributed to the display is set to not more than 1 mm (a part for adhesive for sticking the substrates together). Among the conductors 4 used are stainless steel, Fe, Cu, Ag, Au, Ta, W, Ni, Cr, Mo, Al, C and other conductors.

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,
In particular, the present invention relates to a substrate used for a display device having a large screen.

[0002]

2. Description of the Related Art In recent years, display devices have been increasing in size.
For example, a very large display device is installed on the premises of a station, on the wall of a building, or the like, and the size is several meters square.
As a typical configuration of these display devices, a unit LCD (liquid crystal display) having a size of about 30 cm
A large panel of 3m × 4m50cm is made by arranging 15 pieces in a horizontal direction. Each unit LCD is composed of a matrix of pixels at a pitch of 5.5 mm in the scanning line direction and a pitch of 2.5 mm in the signal line direction, for example, and is a display device of 50 dots × 102 dots.
512 dots (for color display; 3 for monochrome display)
X) resolution.

However, when a large-screen display device is manufactured using a plurality of these unit LCDs, a place for connecting an output of an IC for driving each unit LCD and an electrode of the unit LCD panel is required. Become. For this purpose, conventionally, a non-overlapping portion (a portion not contributing to display) of the substrate of about 5 mm as shown in FIG. 2 was required. The portion that does not contribute to the display has a black line during the display, which is a line that unnaturally divides the large screen. In particular, liquid crystal display devices include a TN type, an STN type, and the like. However, as shown in FIG. 3, when the duty number increases, the display contrast decreases and the display quality deteriorates.

If a large-screen display device is to be manufactured on a single substrate, the wiring resistance of the electrodes increases, and a high voltage is required to perform display, resulting in an increase in power consumption. I will.

[0005]

SUMMARY OF THE INVENTION It is an object of the present invention to solve the above-mentioned problems and to eliminate a line for unnaturally dividing a screen even when displaying a large screen, and to obtain an easy-to-view screen.
Further, the present invention reduces the wiring resistance of a display device having a large screen, thereby realizing a reduction in power consumption.

[0006]

According to the present invention, there is provided a substrate for a display device on which electrodes are formed, wherein the substrate is provided with a hole penetrating the substrate. One end of a conductive wire is connected to the hole, and the hole is electrically connected to the electrode.

In the present invention, stainless steel, Fe, Cu, Ag, Au, Ta, W, Ni, Cr,
Conductors such as Mo, Al, and C can be used.

FIGS. 1A and 1B show an example of a substrate according to the present invention.
This will be described below. 1 (b) is a sectional view of FIG. 1 (a). In FIG. 1, an ITO electrode 3 is formed on a glass substrate 2, and a hole (hole) 6 penetrating the substrate is provided at an end of the glass substrate, and a conductive wire 4 is provided there. And is connected to the ITO electrode. Where the conductor
Since the thickness of 4 can be made extremely thin, for example, 0.3 mm, if this conductive wire 4 is connected to the output side of an IC, for example, a liquid crystal display device using a plurality of substrates shown in FIG. When manufactured, the width of the part that does not contribute to display is 1 m
m (the part of the adhesive for bonding the substrates) is sufficiently possible, and the black line as described above cannot be recognized.

In FIG. 1, one conductor is connected to one ITO electrode, but it is also possible to connect a plurality of conductors. Further, in FIG.
Although holes were provided in the peripheral part of the substrate, it is also possible to create divided wiring on one large substrate and connect each wiring and conductive wire using the holes provided in the substrate. It is possible. By doing so, there is a portion that does not contribute to the display only in the portion of the sealant around the large substrate, and there is no sealant in the portion between the divided wirings.
No abnormal display (eg, black line as described above) will be present at all.

Further, by manufacturing a large-screen display device by combining a plurality of units, a large-screen display device with low wiring resistance can be manufactured, and power consumption can be reduced. Hereinafter, the present invention will be described in more detail with reference to examples.

[0011]

[Embodiment 1] In this embodiment, a case will be described in which a large-screen liquid crystal display device is manufactured by combining unit LCDs. 4A is a plan view of the unit LCD, and FIGS. 4B and 4C are cross-sectional views of FIG. 4A.

An ITO electrode 7 is formed on a pair of glass substrates 5 and 8 (hereinafter, the substrate 5 is referred to as an upper substrate and the substrate 8 is referred to as a lower substrate).
81 were formed in a width of 3 mm (interval: 0.1 mm) using a metal mask by a sputtering method. However, the lower substrate
As shown in Fig. 4 (a), 3.1 m is 3.1 m along two adjacent sides.
Holes 6 (diameter 0.3 mm) penetrating at m pitch are provided.
Then, a conductive wire 4 (thickness 0.3 mm) made of Cu is inserted into the hole 6 by ITO.
Connected to electrode 7. Then, the substrates 5 and 8 were bonded through an alignment film application, rubbing, spacer 9 spraying, and a sealant printing process. Then, liquid crystal was injected, and the injection port was sealed.

Thereafter, a liquid crystal driving IC is formed by a TAB method.
10 and the conducting wire were connected (FIGS. 5A and 5B). In this method, a wiring 12 made of a copper foil formed on a polyimide base film 11 on which an IC 10 is mounted and the conductive wire 4
Are connected using solder 13. The thickness of the base film used was 0.3 mm and the thickness of the copper foil was 0.1 mm.

The unit LCD thus manufactured is vertically extended
A large LCD display device was fabricated using a total of 150 pieces, 15 pieces horizontally. Then, the portion of the display screen that does not contribute to the display is only the sealant portion of each unit LCD (including the hole portion of the substrate), and the width of each sealant may be 1 mm or less. 5m
Compared to the part that did not contribute to the display of m width,
The portion that does not contribute to display could be greatly reduced.

In this embodiment, as shown in FIG. 4 (c), the lead was connected to the lead provided in the hole 6 of the lower substrate 8 by using silver paste 14 to lead the lead from the upper substrate to the back side of the panel. .

Example 2 An ITO electrode was formed on a first substrate (1 m square) 15 by a sputtering method using a metal mask. The electrodes were 3 mm wide and 0.1 mm apart as in Example 1.
mm (scanning line side). Second to fifth substrates 16, 1
Also on IT on 7, 18, 19 (each 25cm x 1m)
An O electrode was prepared, and the conductor was connected to the ITO electrode. The electrodes were manufactured with a width of 3 mm and an interval of 0.1 mm as in Example 1 (signal line side).

Hereinafter, the same steps as those in the first embodiment are used, and FIG.
A panel was produced as shown in FIG. As can be seen from the figure, the signals can be applied independently to the four substrates 16, 17, 18, and 19 having the signal electrodes, so that the duty number can be reduced to 1/4 and the contrast can be reduced. Could be suppressed. In this embodiment, four substrates 16, 17, 18, and 19 on which the scanning lines are formed are used, but a larger number of substrates can be used.

[Embodiment 3] In FIG. 7, ITO electrodes 22 and 23 are formed on first and second substrates (both 3 m square) 20 and 21. The electrodes fabricated on either substrate are divided into three in the length direction. Further, the substrate 20 has the same number of holes 24 as the electrodes, and a chromium conducting wire is connected to the electrodes through the holes. Further, the substrate 20 has holes (not shown) for guiding a conductive wire electrically connected to the electrode 23 on the substrate 21 to the back side of the substrate 20.

A substrate bonding process was performed through an alignment film coating, rubbing, and spacer spraying process. At this time, the length direction of the electrodes formed on each substrate was made to be orthogonal. Liquid crystal is injected into the panel thus manufactured,
The liquid crystal panel was completed. Thereafter, the same as in the first embodiment, TA
Using a method B, a chrome lead was connected to the output side of the IC.

Since the length of the electrodes is shorter than that of the case where continuous electrodes are formed on one substrate by manufacturing the liquid crystal panel as described above, the wiring resistance is reduced and the liquid crystal is driven. The voltage required for this can be reduced. Further, since the duty number could be reduced to 1/3, the display contrast could be increased.

In particular, a 30 cm square panel (unit LCD)
When a large-screen display is performed by using nine pieces of, the width of a portion that does not contribute to the display of the adjacent unit LCD needs to be at least as large as the width of the sealant.
By dividing the electrodes formed on a single substrate and on the substrate, an effect that no portion that does not contribute to the display does not exist in the display of the large screen can also be obtained.

[0022]

As described above, by using the present invention, a high-contrast large-screen display can be obtained.
Further, despite the large screen display, the wiring resistance can be reduced, so that a large driving voltage is not required.
In addition, portions that do not contribute to display in the display area of the large screen display can be reduced or completely removed.

[0023]

[Brief description of the drawings]

FIG. 1 shows an example of a display device using a substrate according to the present invention.

FIG. 2 shows an example of a conventional large-screen display device.

FIG. 3 shows an example of a relationship between a duty number and contrast.

FIG. 4 shows an example of a display device substrate according to the present invention.

FIG. 5 shows an example of a display device substrate according to the present invention.

FIG. 6 shows an example of a display device substrate according to the present invention.

FIG. 7 shows an example of a display device using the substrate according to the present invention.

[Explanation of symbols]

 2 ... substrate 3 ... electrode 4 ... lead wire 6 ... hole 10 ... IC

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[Procedure amendment]

[Submission Date] May 10, 2000 (2000.5.1)
0)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Claims

[Correction method] Change

[Correction contents]

[Claims]

Claims (8)

[Claims] 1. An EL display comprising: a first substrate having electrodes formed thereon; a second substrate provided to face the first substrate; and a conductive wire electrically connected to the electrodes. In the device, the first substrate and the second substrate are bonded to each other, and the first substrate is provided with a hole that penetrates the first substrate, and the electrode, the conductive wire, Are electrically connected through the holes, and a region where the holes are provided is covered with a material that bonds the first substrate and the second substrate. EL display device. 2. An EL display comprising: a first substrate on which electrodes are formed; a second substrate provided to face the first substrate; and conductive wires electrically connected to the electrodes. In the apparatus, the first substrate and the second substrate are bonded to each other, and the second substrate is provided with a hole penetrating the second substrate, and the electrode, the conductive wire, Are electrically connected through the holes, and a region where the holes are provided is covered with a material that bonds the first substrate and the second substrate. EL display device. 3. An EL display comprising: a first substrate on which electrodes are formed; a second substrate provided to face the first substrate; and conductive wires electrically connected to the electrodes. An apparatus, wherein the first substrate and the second substrate are bonded to each other with an adhesive, the first substrate is provided with a hole penetrating the first substrate, and the electrode And the conducting wire are electrically connected to each other through the holes, and a region where the holes are provided is covered with an adhesive bonding the first substrate and the second substrate. An EL display device. 4. An EL display comprising: a first substrate on which electrodes are formed; a second substrate provided to face the first substrate; and a conductive wire electrically connected to the electrodes. An apparatus, wherein the first substrate and the second substrate are bonded to each other with an adhesive, the second substrate is provided with a hole passing through the second substrate, and the electrode And the conducting wire are electrically connected to each other through the holes, and a region where the holes are provided is covered with an adhesive bonding the first substrate and the second substrate. An EL display device. 5. An EL display comprising: a first substrate on which electrodes are formed; a second substrate provided to face the first substrate; and conductive wires electrically connected to the electrodes. In the apparatus, the first substrate and the second substrate are bonded with a sealant, and the first substrate is provided with the first substrate.
A hole penetrating through the substrate is provided, the electrode and the conductive wire are electrically connected through the hole, and the region provided with the hole is the first substrate and the second substrate. And an EL display device covered with a sealant that is attached to the EL display device. 6. An EL display comprising: a first substrate on which electrodes are formed; a second substrate provided to face the first substrate; and conductive wires electrically connected to the electrodes. In the apparatus, the first substrate and the second substrate are bonded with a sealant, and the second substrate has the second substrate
A hole penetrating through the substrate is provided, the electrode and the conductive wire are electrically connected through the hole, and the region provided with the hole is the first substrate and the second substrate. And an EL display device covered with a sealant that is attached to the EL display device. 7. The method according to claim 1, wherein
An EL display device, wherein the electrode is an ITO electrode. 8. The method according to claim 1, wherein
The EL display device, wherein the holes are provided around the first substrate.