JPH11237642A - Active matrix type liquid crystal display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an active matrix type liquid crystal display device capable of decreasing the connection defects of a liquid crystal display panel and a TCP and the contact defects at the time of inspection of the liquid crystal display panel. SOLUTION: Signal input terminals 6 are formed on one substrate 1 constituting the liquid crystal display panel 5. The signal input terminals 6 is formed by forming wiring by extending the gate lines or source lines of TFTs consisting of Ta, Cr, Al or Tl, etc., laminating insulating films of SiNx on this wiring, forming contact holes 7 by etching, etc., in part of the insulating films and forming electrode materials of ITO, etc., on the insulating films including the contact holes 7. The contact holes 7 are formed at the points which are the points exclusive of the joint surfaces at the time of compression bonding of the TCP(tape carrier package) and where probe pins are not brought into contact at the time of display grade inspection. The signal input terminals 6 are formed to the state that the surfaces of the electrode materials of the uppermost layers are not flat.

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, and more particularly, to a thin film transistor (hereinafter referred to as a TFT).
The present invention relates to an active matrix type liquid crystal display device using a switching element such as

[0002]

2. Description of the Related Art A liquid crystal display device displays information by interposing liquid crystal between a pair of substrates on which display electrodes are formed, and modulating light incident from the outside by applying an electric signal between the display electrodes. is there. This liquid crystal display device has advantages such as thinness, light weight, and low power consumption as compared with a CRT, and is being put to practical use in the field of OA equipment or AV equipment. Among them, the demand for an active matrix type liquid crystal display device using a switching element such as a TFT is increasing year by year, and there is a demand for an improvement in the production yield of the active matrix type liquid crystal display device and accuracy of display quality inspection before shipment. .

In order to display on a liquid crystal display device, a signal input terminal of the liquid crystal display panel and a TCP (Tape Carr) equipped with an IC for driving the liquid crystal display panel are mounted.
The control is performed by electrically connecting the IC card to an E.I. As shown in FIG. 6, a wiring 2 made of a conductive material for a signal input terminal of a liquid crystal display panel and a TC
Wiring 9 made of conductive material on P base film 10
Is electrically connected to an anisotropic conductive film (hereinafter referred to as ACF (A
nisotropic ConductiveFil
m)) through the conductive particles 11.
The ACF has a thickness 1 having transparency in which conductive particles 11 made of metal particles such as solder or nickel or metal-plated plastic balls are dispersed in an adhesive 12.
5-30 μm film.

The signal input terminal of the liquid crystal display panel is shown in FIG.
As shown in FIG. 1, the wiring 2 is formed by extending the gate line or source line of the TFT formed on the substrate 1, the insulating film 4 is laminated on the wiring 2, and the insulating film 4 on the wiring 2 is It is formed by removing the electrode material 3 on the wiring 2 by etching or the like.

[0005]

However, as shown in FIG. 7, an insulating film 4 is formed on both ends of the wiring 2 during etching.
May remain, and in this case, both end portions of the electrode material 3 are raised. In such a state, when the TCP is mounted on the liquid crystal display panel, the bonding surface between the electrode material 3 and the TCP is not stable due to the swelling of both ends of the electrode material 3, so that even if a driving signal is input, In some cases, connection failure such as generation of a bright line without operation of the TFT occurs.

Further, at the time of display quality inspection of the liquid crystal display panel, as shown in FIG. 8, a probe pin 13 attached to a holding block 14 is brought into contact with the electrode material 3. When the protruding contact is made, the probe pin 13 is worn, and the contact surface between the probe pin 13 and the electrode material 3 becomes unstable.
Even if a drive signal is input from 3, the TFT does not operate and a contact failure such as generation of a bright line occurs, and the non-defective product rate deteriorates.

Further, when the alignment film for aligning the liquid crystal is subjected to an alignment treatment such as rubbing, the alignment film may adhere to the signal input terminal of the liquid crystal display panel. In this case, as shown in FIG. 9A, the alignment film 15 accumulates near the bulges at both ends of the electrode material 3, and the probe pins 13
9B, the alignment film 15 adheres to the tip of the probe pin 13 as shown in FIG. Alignment film 15
Is insulative, and if it adheres to the tip of the probe pin 13, it causes a contact failure and lowers the non-defective test rate.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and is an active matrix capable of reducing a connection failure between a liquid crystal display panel and a TCP and a contact failure at the time of inspection of a liquid crystal display panel. It is intended to provide a liquid crystal display device of the type.

[0009]

According to a first aspect of the present invention, there is provided an active matrix type liquid crystal display device in which a gate line or a source line of a thin film transistor is extended to form a wiring. An insulating film is laminated on the wiring, and a contact hole is provided at a position other than a bonding surface of the insulating film for electrically connecting a drive circuit, and the contact hole is provided above the wiring including the contact hole. It has a signal input terminal portion in which an electrode material is formed on an insulating film.

According to a second aspect of the present invention, there is provided an active matrix type liquid crystal display device according to the first aspect, wherein the contact hole is provided at a position where a probe pin is not contacted during a display quality inspection. It is characterized by having.

According to the active matrix type liquid crystal display device of the present invention, a wiring is formed by extending a gate line or a source line of a thin film transistor, an insulating film is laminated on the wiring, and a driving circuit for the insulating film is formed. A contact hole is provided in a portion except for a joint surface for electrical connection, and a signal input terminal portion is provided in which an electrode material is formed on an insulating film located above a wiring including the contact hole. Because the electrode material that becomes the surface of the part becomes flat on the joint surface with the drive circuit,
The bonding surface between the electrode material and the driving circuit such as TCP can be kept in a stable state, and the connection failure such as the generation of a bright line without operating the thin film transistor even when the driving signal is input can be reduced.

Further, since the contact hole is provided at a place where the probe pin is not contacted during the display quality inspection, it is possible to prevent the probe pin from being worn when the probe pin is brought into contact with the electrode material and inspected. Since the contact surface between the probe pin and the electrode material can be maintained in a stable state, even if a driving signal is input from the probe pin, the thin film transistor does not operate and a contact failure such as a bright line is generated. Can be reduced. Furthermore, when performing an alignment treatment such as rubbing on the alignment film for aligning the liquid crystal, the alignment film does not accumulate on the electrode material.
Since the alignment film does not adhere to the tip of the probe pin, it is possible to reduce the contact failure that occurs when the insulating alignment film adheres to the tip of the probe pin.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a plan view showing a signal input terminal portion of a liquid crystal display device according to the present invention, and FIG.
3 is an explanatory view showing the case where FIG. 2 is viewed from the side, FIG. 4 is an explanatory view showing inspection using a probe pin, and FIG. 5 is a signal input terminal portion of a liquid crystal display panel and T
It is explanatory drawing which shows the connection part with CP.

As shown in FIGS. 1 and 2, a signal input terminal 6 is formed on one substrate 1 constituting the liquid crystal display panel 5. The signal input terminal 6 is made of Ta, Cr, Al
Alternatively, a wiring 2 is formed by extending a gate line or a source line of a TFT made of Ti or the like, and SiN is formed on the wiring 2.
An insulating film 4 such as _X is laminated, a contact hole 7 is formed in a part of the insulating film 4 by etching or the like, and an electrode material 3 such as ITO is formed on the insulating film 4 including the contact hole 7. Is done.

The contact hole 7 is provided at a position other than the bonding surface 8 when the TCP is crimped, and at a position where the probe pin is not brought into contact during the display quality inspection.

When the signal input terminal 6 is viewed from the side, as shown in FIG. 3, the surface of the uppermost electrode material 3 is flat.

Therefore, as shown in FIG. 4, the probe pin 13 attached to the holding block 14 is
When the probe pin 13 is inspected by contacting the probe pin 13, wear of the probe pin 13 can be reduced.
Since the contact surface between the electrode and the electrode material 3 can be maintained in a stable state, even if a driving signal is input from the probe pin 13, the TFT does not operate and a contact failure such as generation of a bright line is reduced, and inspection is performed. The non-defective rate can be improved.

Further, when the alignment film for aligning the liquid crystal is subjected to an alignment treatment such as rubbing, the alignment film does not accumulate on the electrode material 3, and the inspection with the probe pin 13 causes the alignment of the probe pin 13. Since the alignment film does not adhere to the distal end portion, it is possible to reduce the contact failure that occurs when the insulating alignment film adheres to the distal end portion of the probe pin 13 and improve the non-defective product rate.

As shown in FIG. 5, the electrode material 3 and T
The wiring 9 made of a conductive material on the base film 10 of the CP is made of a metal particle such as solder or nickel, or a conductive particle 11 made of a metal-plated plastic ball or the like dispersed in an adhesive 12. 15
When pressure bonding is performed using an ACF made of a film having a thickness of about 30 μm, the bonding surface between the electrode material 3 and the TCP wiring 9 can be maintained in a stable state, so that the TFT operates even when a drive signal is input. In addition, it is possible to reduce poor connection such as generation of bright lines, and to improve the non-defective rate of the liquid crystal display device.

[0020]

As described above, according to the active matrix type liquid crystal display device of the present invention, a wiring is formed by extending a gate line or a source line of a thin film transistor, and an insulating film is laminated on the wiring. A signal input terminal in which a contact hole is provided in a portion other than a bonding surface of the insulating film for electrically connecting a drive circuit, and an electrode material is formed on the insulating film located above the wiring including the contact hole. By having the portion, the electrode material serving as the surface of the signal input terminal portion becomes flat at the joint surface with the drive circuit, so that the joint surface between the electrode material and the drive circuit such as TCP is kept in a stable state. It is possible to improve the yield of liquid crystal display devices by reducing connection failures such as the occurrence of bright lines without operating the thin film transistor even when a drive signal is input. Kill.

Further, since the contact hole is provided at a position where the probe pin is not contacted during the display quality inspection, it is possible to prevent the probe pin from being worn when the probe pin is brought into contact with the electrode material and inspected. Since the contact surface between the probe pin and the electrode material can be maintained in a stable state, even if a driving signal is input from the probe pin, the thin film transistor does not operate and a contact failure such as a bright line is generated. Reduce
The inspection non-defective rate can be improved. Furthermore, when performing an alignment treatment such as rubbing on the alignment film for aligning the liquid crystal, the alignment film does not accumulate on the electrode material. Since there is no sticking, it is possible to reduce the contact failure caused by the insulating alignment film sticking to the tip of the probe pin, and to improve the non-defective product rate.

[Brief description of the drawings]

FIG. 1 is a plan view showing a signal input terminal portion of a liquid crystal display device according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an explanatory diagram showing a case where FIG. 2 is viewed from a side.

FIG. 4 is an explanatory diagram showing an inspection using a probe pin.

FIG. 5 is an explanatory diagram showing a connection portion between a signal input terminal portion and a TCP of the liquid crystal display panel.

FIG. 6 shows a signal input terminal portion and a TC of a conventional liquid crystal display panel.
It is explanatory drawing which shows the connection part with P.

FIG. 7 is an explanatory diagram showing a signal input terminal portion of a conventional liquid crystal display panel.

FIG. 8 is an explanatory view showing an inspection using a conventional probe pin.

FIGS. 9A and 9B are explanatory views showing a state in which an alignment film adheres to the tip of a probe pin.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Substrate 2 Wiring 3 Electrode material 4 Insulating film 5 Liquid crystal display panel 6 Signal input terminal 7 Contact hole 8 Joining surface at the time of press-fitting TCP 9 TCP wiring 10 TCP base film 11 ACF conductive particles 12 ACF adhesive 13 Probe pin 14 Holding block 15 Alignment film

Claims (2)

[Claims] 1. A wiring is formed by extending a gate line or a source line of a thin film transistor, an insulating film is laminated on the wiring, and a junction surface of the insulating film for electrically connecting a driving circuit is excluded. An active matrix type liquid crystal display device, comprising: a signal input terminal portion in which a contact hole is provided at a location and an electrode material is formed on the insulating film located above the wiring including the contact hole. 2. The active matrix type liquid crystal display device according to claim 1, wherein said contact hole is provided at a position where a probe pin is not contacted during a display quality inspection.