JPH0933937A - Active matrix type liquid crystal panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent electric conduction to an opposite-side substrate due to scatter of metal at the time of correcting defective wiring by positioning a spare scanning line or spare signal line directly below a sealing material. SOLUTION: Both spare signal lines are arranged directly below the seal material 15, or a terminal-side spare scanning line 19 is made to cross all scanning lines 4 on the terminal side at right angles across an insulating film 3 and arranged directly below the seal material 15. Further, a spare scanning line 20 which is not on the terminal side crosses all scanning lines 4 which are not on the terminal side at right angles across the insulating film 3 and arranged right below a seal material 17. Further, a liquid crystal injection hole 14 is positioned on the long side on the non-terminal side of an insulating substrate 2 when the spare scanning lines 19 and 20 are provided. This position relation is employed since the liquid crystal injection hole 14 disturbs wiring when present on the terminal side of an insulating substrate 2 and if the liquid crystal injection hole 14 is present directly above the non-terminal side spare scanning line 19, a metal piece of the part irradiated with laser light is scattered or a metallic film has a projection since the seal material 15 is not present at the part of the liquid crystal injection hole 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an active matrix type liquid crystal which applies a drive signal to a display pixel electrode through a switching element and performs display by a potential difference between the pixel electrode and a common electrode facing it. The present invention relates to a display panel of a display device.

[0002]

2. Description of the Related Art In a conventional active matrix type liquid crystal display device, individual picture element electrodes are arranged in a matrix, and a switching element is provided for each picture element electrode. Each switching element is selected by the scanning line, and the potential is written in each pixel electrode from the signal line. Due to the voltage difference between the picture element electrode and the counter electrode, the intervening liquid crystal is optically modulated and visually recognized as a display pattern. TFTs (thin film transistors), MIM (metal-insulating film-metal) elements and the like are generally known as switching elements for selectively driving the pixel electrodes.

Since fine processing is required for producing such a display device, a thin film forming technique and a photolithography technique are usually used. A high degree of cleanliness is required in the production process using these technologies, but in the actual production process, there is a small amount of dust,
Defects often occur due to the dust, scratches and stains on the base. In particular, when these defects occur in the scanning lines or the signal lines, linear lighting defects occur when displaying the panel, which is a serious problem.

Therefore, a conventional active matrix type liquid crystal display panel which solves the above problems will be described with reference to FIGS. FIG. 5 is a plan view of the active matrix type liquid crystal display panel, and FIG. 6 is a sectional view taken along line CC of FIG.

In FIGS. 5 and 6, the element side substrate 1 is
A plurality of scanning lines 4 and a plurality of signal lines 5 are arranged orthogonally on an insulating substrate 2 such as glass or quartz with an insulating film 3 interposed therebetween. Pixel electrodes (not shown) are arranged in respective regions surrounded by the scanning lines 4 and the signal lines 5, and the respective pixel electrodes intersect with the scanning lines 4 and the signal lines 5, respectively. The part is connected to a switching element (not shown) such as a TFT or MIM, and the switching element controls the pixel electrode.

A region (hereinafter, referred to as an effective display region) 6 in which the pixel electrodes are arranged in a matrix form has a long side and a short side (hereinafter, referred to as a non-effective side) of the insulating substrate 2 on which terminals are not formed. Conduction for transfer of a common counter electrode 13 described later at three corners of a long side and a short side (hereinafter referred to as a terminal side) which are formed close to one corner of the terminal side) and on which the terminal is formed. The counter electrode input terminals 7 connected to the substance 16 are provided respectively. The counter electrode wiring 8 is arranged on the short side of the insulating substrate 2, and the counter electrode wiring 8 and the counter electrode input terminal 7 in contact with the short side of the insulating substrate 2 are connected. There is. The scanning lines 4 and the signal lines 5 are extended to the terminal side of the insulating substrate 2 from the effective display area 6 to the terminals to which the driver (not shown) for driving is connected.

A terminal side spare signal line 9 is arranged so as to be orthogonal to all of the terminal side signal lines 5 with the insulating film 3 interposed therebetween.
Also on the opposite side, the non-terminal side auxiliary signal line 10 is arranged so as to be orthogonal to all the non-terminal side signal lines 5 with the insulating film 3 interposed therebetween.

In this conventional example, the scanning line 4 is formed of a metal film on the insulating substrate 2, and at this time, the terminal side spare signal line 9 and the non-terminal side spare signal line 10 are simultaneously formed in the same layer. May be formed in a different layer,
If some insulation film is sandwiched, both spare signal lines 9, 10
May be above or below the signal line 5.

It is also possible to subject both the spare signal lines 9 and 10 to anodic oxidation treatment, and further to provide insulation between the signal line 5 and the spare signal lines 9 and 10 other than the insulating film 3. When some pattern forming process including a film is performed, an insulating film pattern may be arranged at the intersection of the signal line 5 and the spare signal lines 9 and 10 for the purpose of reducing the capacity of the insulating film. It is possible.

The spare signal lines 9 and 10 are electrically connected to each other inside or outside the panel. Or at the stage where a drive printed circuit board (not shown) is attached to the panel,
If necessary, a method of connecting on the driving printed board may be adopted.

Then, a polyimide type alignment film (not shown) is formed on the effective display region 6 of the completed element side substrate 1,
An alignment function is added by a treatment such as rubbing.

Further, also in the counter side substrate 11 to be bonded to the element side substrate 1, ITO is formed on the insulating substrate 12.
After forming a transparent common counter electrode 13 such as (Indum Tin Oxide), a polyimide-based alignment film is also formed on the common counter electrode 13 corresponding to the effective display area 6, and an alignment function is added by a treatment such as rubbing. Let

When the element-side substrate 1 and the counter-side substrate 11 are bonded together, the above-mentioned effective display is performed except for the liquid crystal injection port 14 shown in FIG. 5 on the surface of the element-side substrate 1 on which the alignment film is formed. A sealing material 15 is applied by a printing method or the like so as to surround the area 6 and both the spare signal lines 9 and 10.

Further, after depositing the conductive material 16 shown in FIG. 5 on the signal input terminal 7 for the counter electrode of the element side substrate 1,
Spacers (not shown) for making the cell thickness of the liquid crystal layer 17 constant are scattered, the element-side substrate 1 and the counter-side substrate 11 are bonded as shown in FIG. 5, and heat is applied to cure the sealing material 15. . After that, liquid crystal is injected through the liquid crystal injection port 14 and the liquid crystal injection port 14 is closed by the sealing material 18, so that the liquid crystal display panel is completed.

In the liquid crystal display panel manufactured as described above, when a disconnection is found in the signal line 5 by inspecting the panel, the disconnected signal line 5 and the terminal side spare signal line 9 are provided at both ends of the signal line 5. The insulating film 3 is subjected to a dielectric breakdown by irradiating a laser from the outside of the panel at the intersection between the signal line 5 and the spare signal line 5 and the spare signal line 10 on the non-terminal side. The signal lines 9 and 10 are fused and connected to each other so that the intersections are electrically connected.

Even if the line is not broken, if there is an electrical leak on the signal line 5 and a line defect occurs,
A line defect can be repaired by cutting the leaked portion with a laser to artificially cause a wire breakage and performing the same processing as described above. Since the spare signal lines 9 and 10 at both ends of the signal line 5 are electrically connected in advance, a signal input from the terminal side of the signal line 5 passes through the spare signal lines 9 and 10 and then the signal line 5
to go into. In this way, a normal display can be obtained even on the broken signal line 5.

[0017]

However, the active matrix type liquid crystal display panel substrate as described above is
Scanning line 4 or signal line 5 (defective wiring) by laser
When attempting to fuse and connect the spare signal lines 9 and 10,
A metal piece in the portion irradiated with the laser scatters in the liquid crystal layer or a projection is formed on the metal film. If metal pieces scatter in the liquid crystal layer 17, the liquid crystal may be contaminated and display unevenness may occur, or display unevenness may occur later due to aging. Also,
When the common counter electrode 13 is located in a portion of the counter side substrate 11 facing the auxiliary signal lines 9 and 10, the protrusion of the metal film and the common counter electrode 13 come into contact with each other due to the above-mentioned cause, and the gap between the counter side substrate 11 and Conduction occurs at, and a linear leak defect occurs.

Further, even when the common counter electrode 13 does not exist in the portion opposed to the spare signal lines 9 and 10, a light shielding thin film is usually formed in that portion, and the thin film is made of Cr (chrome) or the like. If it is a conductive substance, a leak defect occurs as described above.

Usually, when a leak defect with the opposite substrate 11 occurs in the panel, a mechanical shock is applied to both substrates 1 and 11 to release the contact portion and make a correction. Since 9 and 10 are provided in the vicinity of the sealing material 15, it is difficult to apply a force to the contact portion,
The leak point cannot be released.

Further, the defective wiring and the spare signal lines 9 and 1
When the power of the laser applied to the intersection with 0 is too strong, the laser transmits through the intersection, and the transmitted laser transmits through the liquid crystal layer 17 and the light-shielding thin film provided on the element side substrate 11. However, there is a problem in that the light is broken and a light leakage defect is caused.

The active matrix type liquid crystal display panel of the present invention solves the above problems, and when the defective wiring and the spare wiring are fused and connected by a laser to correct the defective wiring, metal pieces may scatter. , An active matrix which can prevent a projection from being formed on the metal film to cause conduction with the counter-side substrate and prevent the laser transmitted through the element-side substrate from destroying the light-shielding thin film. An object of the present invention is to provide a type liquid crystal display panel.

[0022]

The invention for achieving the above object is to provide a plurality of scanning lines and a plurality of signal lines which are arranged on an insulating substrate at right angles to each other and sandwich an insulating film, A plurality of picture element electrodes arranged in respective regions surrounded by the scanning lines and the signal lines, a switching element connecting the respective picture element electrodes to the scanning lines and the signal lines, and the plurality of scanning lines An element side substrate having a preliminary scanning line or a preliminary signal line wired to intersect with the plurality of signal lines; an opposite side substrate having a common electrode facing the element side substrate; A side substrate and an opposite side substrate are bonded together, and a sealing material that seals liquid crystal to form a liquid crystal layer between the element side substrate and the opposite side substrate, and the element side substrate and the opposite side substrate. Is attached via the above sealing material. In Restorative matrix type liquid crystal display panel, the preliminary scanning lines or spare signal line is positioned immediately below the sealing member.

With the above configuration, when a defect such as a disconnection occurs in the scanning line or the signal line, the insulating film at the intersection of the defective wiring and the spare wiring is dielectrically broken down by the laser, and the defective wiring and the spare wiring are By melting and connecting and to make conductive, defects in scanning lines and signal lines are corrected.

Further, since the spare wiring is located directly below the sealing material, when the laser is used to connect the spare wiring and the defective wiring, the metal piece of the portion irradiated with the laser scatters in the liquid crystal layer. In addition, the projection formed on the metal film does not cause conduction with the opposite substrate.

Further, when the laser is applied to the intersection of the defective wiring and the spare wiring from the other main surface of the insulating substrate,
The laser transmitted through the intersection cannot pass through the sealing material.

[0026]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the active matrix type liquid crystal display panel of the present invention will be described in detail below with reference to FIGS. The same parts as those in the above-mentioned conventional example are designated by the same reference numerals, and the description thereof will be omitted.

First, a first embodiment of an active matrix type liquid crystal display panel of the present invention will be described with reference to FIGS. FIG. 1 is a plan view of an active matrix type liquid crystal display panel, and FIG. 2 is a sectional view taken along line AA shown in FIG.

1 and 2 are different from the above conventional example.
In the above, both the spare signal lines 9 and 10 are arranged between the effective display area 6 and the seal material 15. However, in the first embodiment, the both spare signal lines 9 and 10 are arranged directly below the seal material 15. .

Next, a second embodiment of the active matrix type liquid crystal display panel of the present invention will be described with reference to FIGS. 3 is a plan view of the active matrix type liquid crystal display panel, and FIG. 4 is a sectional view taken along line BB shown in FIG.

In the first embodiment described above, the spare signal lines 9 and 10 are used for the spare wiring, but in the second embodiment, the case where the spare scanning lines 19 and 20 are used will be described.

When the preliminary scanning lines 19 and 20 are provided, the terminal side preliminary scanning line 19 in FIG. 3 and FIG.
It is orthogonal to all the scanning lines 4 on the terminal side through the insulating film 3 and is arranged directly below the sealing material 15. The non-terminal side preliminary scanning line 20 is orthogonal to the non-terminal side scanning line 4 with the insulating film 3 interposed therebetween, and is arranged immediately below the sealing material 17.

Further, the liquid crystal inlet 14 is provided with the spare signal lines 9 and 1.
When 0 was used, it was located on the non-terminal side short side of the insulating substrate 2, but when the preliminary scanning lines 19 and 20 were provided, it was located on the non-terminal side long side of the insulating substrate 2. Let This positional relationship interferes with the wiring when the liquid crystal injection port 14 exists on the terminal side of the insulating substrate 2, and when the liquid crystal injection port 14 exists directly above the non-terminal side preliminary scanning line 19, the liquid crystal injection port 14 exists. This is because the sealing material 15 does not exist in the portion, so that the metal pieces in the portion irradiated with the laser scatter or the metal film has a protrusion in the portion.

Further, in the description of the line defect described in the conventional example, in the second embodiment, the spare signal lines 9 and 10 are only replaced with the spare scanning lines 19 and 20, and the description of the correction of the line defect is the same. Therefore, the description thereof will be omitted.

[0034]

Since the active matrix type liquid crystal display panel of the present invention has the above-mentioned structure, the defective wiring and the preliminary wiring are melted and connected by the laser when the preliminary wiring is located directly below the sealing material. In such a case, the solid sealing material suppresses scattering of metal pieces in the laser-irradiated portion into the liquid crystal layer and projection of the metal film.

Therefore, since the metal pieces do not scatter, there is no possibility that the liquid crystal is contaminated to cause display unevenness or display unevenness later due to a change with time. Further, since protrusions are less likely to be formed on the metal film, a linear leak defect may occur when the protrusions of the metal film come into contact with a conductive material such as a common electrode of the counter substrate or a light shielding thin film provided on the counter substrate. It can be prevented from occurring, and the non-defective rate of the panel can be improved.

When the laser is applied to the intersection of the defective wiring and the spare wiring from the other main surface of the insulating substrate, the laser passing through the intersection cannot pass through the sealing material. A laser passing through the intersecting portion does not destroy the light-shielding thin film on the opposite substrate and causes no light leakage defect, and a wide margin of laser irradiation conditions can be secured.

Further, after the defective wiring and the spare wiring are melt-connected to correct the defective wiring, even if a force is applied to the element side substrate to bend the substrate, the connecting portion is fixed by the sealing material and curved. Since it is difficult to do so, the possibility that the defective wiring and the spare wiring will be disconnected due to the bending is very small, and the reliability is improved.

[Brief description of drawings]

FIG. 1 is a transparent plan view of an active matrix type liquid crystal display panel showing a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line AA shown in FIG.

FIG. 3 is a transparent plan view of an active matrix type liquid crystal display panel showing a second embodiment of the present invention.

4 is a sectional view taken along line BB shown in FIG.

FIG. 5 is a transparent plan view of a conventional active matrix type liquid crystal display panel.

6 is a cross-sectional view taken along line CC of FIG.

[Explanation of symbols]

 1 element side substrate 2, 12 insulating substrate 3 insulating film 4 scanning line 5 signal line 6 effective display area 7 counter electrode input terminal 8 counter electrode wiring 9 terminal side spare signal line 10 non-terminal side spare signal line 11 counter side Substrate 13 Common counter electrode 14 Liquid crystal injection port 15 Sealing material 16 Conductive material 17 Liquid crystal layer 18 Sealing material 19 Terminal side preliminary scanning line 20 Non-terminal side preliminary scanning line

Claims (1)

[Claims] 1. A plurality of scanning lines and a plurality of signal lines, which are arranged on an insulating substrate at right angles to each other with an insulating film interposed therebetween, and in respective regions surrounded by the scanning lines and the signal lines. A plurality of picture element electrodes arranged, a switching element that connects each picture element electrode to the scanning line and the signal line, and a preliminary scanning line or a plurality of signals wired so as to intersect with the plurality of scanning lines. An element-side substrate having a spare signal line that intersects with a line, an opposite-side substrate having a common electrode facing the element-side substrate, the element-side substrate and the opposite-side substrate are bonded together, and the element An active matrix liquid crystal in which a sealing material that seals liquid crystal to form a liquid crystal layer is formed between the side substrate and the counter substrate, and the element-side substrate and the counter substrate are bonded together via the seal material. In the display panel, Active matrix liquid crystal display panel of the preliminary scanning lines or spare signal line directly below the serial sealant, characterized in that position.