JPH06301046A - Liquid crystal display device - Google Patents

Abstract

PURPOSE:To prevent a cost increase by simplifying the method for correcting the disconnection in a liquid crystal display panel. CONSTITUTION:Plural pieces of slits 4 for correction are produced, simultaneously with wirings and terminal electrodes 5, on polyimide 6 corresponding to the press-contact areas of a flexible substrate 7 for mounting of an IC 3 for driving. The electrodes which are diametrically opposite to and face each other in the slits and the pads for correction are connected by turning around wirings for the detected disconnection point of the liquid crystal display panel 1, by which the disconnection of the liquid crystal display panel is easily connected.

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 composed of a liquid crystal display panel and a substrate on which a driving IC is mounted, and more particularly to a liquid crystal display device having an improved line break correction of the liquid crystal display panel. is there.

[0002]

2. Description of the Related Art With the diversification of industrial equipment, thin flat display devices have been developed for a wide range of applications from ultra-compact micro size to ultra-large high-vision compatible.
In addition, since a display device using liquid crystal in a flat display device is used as a display device for a television receiver or an OA device or a display device for a video device, a high resolution liquid crystal display device must be realized.

In order to construct a high-resolution liquid crystal display device, the number of signal lines in the liquid crystal display device is increased, and as the number of signal lines is increased, the number of terminal electrodes arranged on the liquid crystal panel is increased and the arrangement pitch is increased. Higher density is also unavoidable.

However, when the number of signal lines is increased, the width of signal lines is reduced, and the number of terminals is increased and the density is increased as described above, the disconnection of signal lines due to defects during the manufacturing process also increases. . When the signal line is disconnected, no signal is supplied from the disconnection point to the front, resulting in a significant deterioration in display image quality. Therefore, it is necessary to correct these disconnection defects.

As shown in FIG. 5, the conventional method for repairing the disconnection is as shown in FIG. 5, where c and c ', d of the terminal electrode 5 connected to the signal line including the disconnection point 8 of the signal line in the liquid crystal display panel 1. The correction wiring 51 was connected to the section and the d'section by soldering, and signals were supplied from both sides of the signal line.

In the method shown in FIG. 5, the correction wiring is shown to be directly connected to the terminal electrode portion 5.
There is also a method of providing a connection pad in advance and connecting the correction wiring 51 thereto.

As disclosed in Japanese Patent Laid-Open No. 59-208581, a substrate having a correction wiring is provided separately from the substrate on which a liquid crystal display panel or a driving IC is mounted, and the terminal electrodes and the substrate on the substrate are provided. There is also a method of connecting the correction wiring and supplying a signal to the disconnection portion.

Further, as disclosed in Japanese Patent Application Laid-Open No. 64-59319, there has been proposed a method of providing a correction wiring in a portion other than the liquid crystal display area and connecting it to a terminal electrode.

[0009]

However, in the conventional method of repairing the disconnection defect, since the repair wiring is connected to the terminal electrode portion by soldering, the resolution of the liquid crystal display device is increased and the distance between the terminal electrode portions is increased. As the width becomes narrower, it becomes difficult to connect the correction wiring.

Further, in the method of providing the substrate having the correction wiring formed separately from the substrate on which the liquid crystal display panel and the driving IC are mounted, the unit cost of the liquid crystal display device is increased because the extra substrate is provided.

Further, in the method of providing the correction wiring in the portion other than the liquid crystal display area, since the extra correction wiring is provided in the liquid crystal panel, the entire liquid crystal display device becomes large.
There is a problem.

[0012]

In the liquid crystal display device of the present invention, a plurality of correction slits are formed on a flexible substrate on which a driving IC for driving the liquid crystal display panel is mounted, and disconnection occurs in the liquid crystal display panel. On both sides of the signal line
Between the flexible substrate on which the correction slit is formed and the correction electrode pad provided on the glass substrate forming the liquid crystal display panel, the wiring is connected through the correction slit by a lead wiring. To do.

[0013]

Embodiments of the present invention will now be described in detail with reference to the drawings.

Embodiment 1 FIG. 1 is a main sectional view showing an embodiment of the present invention,
FIG. 2 is a top view of FIG. 1 and 2, 1 is a liquid crystal panel, 2 is a terminal electrode on a glass substrate, 3
Is a driving IC, 4 is a correction slit, 5 is a terminal electrode on a flexible substrate, 6 is a polyimide, 7 is a flexible substrate, 8 is a signal line including a disconnection point in the panel, and 51 is a lead wiring. .

In the first embodiment of the present invention, as shown in FIGS. 1 and 2, an anisotropic conductive adhesive is applied to a correction connection pad connected to a terminal electrode portion 2 of a liquid crystal panel which constitutes a liquid crystal display device. A correction slit 4 is formed in the polyimide layer 6 located on the back surface (upper side) of the finger corresponding to the pressure-bonded portion of the flexible substrate 7 on which the driving IC 3 fixed by an agent (hereinafter referred to as ACF) is mounted. Four
The terminal wiring 5 is connected to the terminal electrode 5 on the flexible substrate 7 via the wiring line 51.

The correction slit 4 is formed at the same time as pattern formation in the same process when the flexible substrate 7 is formed. The flexible substrate is manufactured by punching a polyimide tape prepared in advance, including a correction slit.

Next, flash copper plating is performed, then patterning is performed with photoresist, electrodes are formed by copper additive plating and through hole plating, and film etching is performed to form device holes and sprocket holes. A two-layer double-sided patterned tape is completed by etching the copper flash layer.
Then, a predetermined drive IC 3 is mounted on the completed tape to obtain the flexible substrate 7.

The terminal electrode 5 of the flexible substrate 7 is
After aligning the terminal electrode 2 of the liquid crystal display panel 1 and thermocompression-bonding it to the terminal electrode 2 of the liquid crystal display panel 1 with an anisotropic conductive adhesive that is temporarily crimped onto the terminal electrode 5 of the flexible substrate 7, The flexible substrate 7 on which the driving IC 3 is mounted is mounted on the panel substrate. The liquid crystal display device thus manufactured is tested for continuity at both ends of the terminal electrode portion 5.

When a signal line having a disconnection point 8 is detected, between the correction electrode 4 and the terminal electrode a in the correction slit 4 arranged on the flexible substrate 7 connected to the signal line. At the AC line
Connect by F.

With this configuration, the signal is not supplied from the disconnection point 8 to the other, but the signal is supplied through the route of the terminal electrode section → the leading wiring → the correction connection pad → the signal line. Therefore, the display defect of the liquid crystal display device can be corrected.

Embodiment 2 FIG. 3 is a sectional view of a flexible substrate having a plurality of slits. FIG. 4 is a top view of FIG. 3 and 4, 2 is a terminal electrode on the substrate, 3 is a driving IC, 4 is a correction slit, 6 is polyimide, and 9 is a protective resist.

In the second embodiment, as shown in FIG. 3, a plurality of correction slits are arranged in parallel on the back surface (upper side) of the terminal electrode of the flexible substrate 6 so as to be compatible with the terminal electrode 5. After mounting the driving IC 3 on the formed flexible substrate with the correction slit, the terminal electrodes were aligned and mounted on the liquid crystal panel by ACF. Next, after conducting a continuity test, the lead wiring was connected to the terminal electrode arranged in the correction slit at the disconnection point that occurred with a conduction adhesive.

In the first and second embodiments described above, the lead wiring is used, but in the ultra-fine pitch mounting, the correction wiring may be connected by wire bonding. it can. In addition, a two-layer structure substrate was used for the flexible substrate,
A substrate having a three-layer structure may be used.

Due to the above, the size of the board can be reduced.
Work efficiency can be improved.

[0025]

As described above, according to the present invention, a plurality of correction slits are formed on a flexible substrate on which a driving IC for driving a liquid crystal display panel is mounted, and a signal is disconnected in the liquid crystal display panel. By connecting both sides of the line between the flexible substrate formed with the correction slit and the correction electrode pad provided on the glass substrate constituting the liquid crystal display panel, through the correction slit, by the routing line, Even in a liquid crystal display device in which the signal lines are formed with a high density, it is possible to correct the broken signal line, and the yield of the liquid crystal display device can be increased.

Further, since the process of forming the correction slit on the flexible substrate is made at the same time as the pattern formation of the flexible substrate, no extra parts are required and the process can be simplified, so that the cost increase can be prevented. Have advantages.

[Brief description of drawings]

FIG. 1 is a main cross-sectional view of a liquid crystal display device showing a first embodiment of the present invention.

FIG. 2 is a top view of FIG.

FIG. 3 is a sectional view of a flexible substrate according to a second embodiment of the present invention.

FIG. 4 is a top view of FIG.

FIG. 5 is a main conceptual diagram showing a conventional method for correcting a liquid crystal display device.

[Explanation of symbols]

 1 Liquid crystal panel 2 Terminal electrode on glass substrate 3 Driving IC 4 Slit for correction 5 Terminal electrode of flexible substrate 6 Polyimide 7 Flexible substrate 8 Signal line including disconnection in the panel 9 Protective resist 51 Wiring line for correction a Correction For connecting with the slit for repairing a'Connecting with the pad for correction

Claims (3)

[Claims] 1. A liquid crystal display device comprising a liquid crystal display panel and a substrate on which a driving IC for driving the liquid crystal display panel is mounted, the driving IC for driving the liquid crystal display panel comprising: A plurality of correction slits are formed on the mounted flexible substrate, and both sides of the signal line that is disconnected in the liquid crystal display panel are
A liquid crystal display characterized in that a flexible substrate having the integration slit formed therein and a correction electrode pad provided on a glass substrate forming a liquid crystal display panel are connected by lead wirings through the correction slit. device. 2. The correction slit according to claim 1, wherein the correction slit is formed in a finger portion on a flexible substrate,
A liquid crystal display device, characterized in that the liquid crystal display device is formed so as to cross a polyimide layer corresponding to a portion to be pressure-bonded. 3. The finger in the repair slit of the flexible substrate on which the driving IC is mounted and the repairing electrode pad provided on the opposing glass substrate are connected to each other via the routing wiring according to claim 1. A liquid crystal display device, characterized in that the slit is protected later by a molding agent.