JPH05333360A - Wiring film for inspecting electrode for flat display panel display - Google Patents

Abstract

PURPOSE:To inspect all the electrodes for display without damaging them concerning the wiring film utilized for inspecting the signals of the electrodes for flat display panel display. CONSTITUTION:A wiring film 11 is connected to a board (glass board) 1a of a flat display panel revealing the terminal parts of a lot of electrodes for display. On the rear of various wiring films 11a, 11b and 11c, conductor patterns 13, 17 or 19 are formed to be connected to the electrodes for display on the board 1a. Inspecting terminals 14 communicated to the conductor patterns 13 are directed upward at the returning bending of an insulated film 12. The inspecting terminals 14 communicated to the conductor patterns 17 are formed on the surface of the insulated film 12. The conductor patterns 19 are communicated to via holes 15 for inspection.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiring film used for signal inspection of display electrodes of flat display panels.

[0002]

2. Description of the Related Art TAB (Tape Automated Bonding), CO
G (Chip on Glass) mounting technology is indispensable for flat display panels that are required to be small and lightweight, and particularly, liquid crystal display devices (LCD) and plasma display devices (PDP) require fine connection. Because
Widely used.

FIG. 9 is a schematic plan view (a) showing a connection between a liquid crystal display panel and a TAB tape and a TA mounted with an IC chip.
FIG. 10 is a schematic plan view (B) of the B tape, and FIG. 10 is a schematic plan view (A) of a liquid crystal display panel on which an IC chip is directly mounted and a schematic plan view (B) of a conductor pattern connected to the IC chip. ..

In FIG. 9 (a), a liquid crystal display panel 1 in which a pair of glass substrates 1a and 1b on which a large number of display electrodes are formed is filled with liquid crystal, and three printed wiring boards 2 are provided.
Are connected by a TAB tape 3.

In FIG. 9B, in the TAB tape 3 having the IC chip 4 for driving the liquid crystal display panel mounted, one end is connected to the IC chip 4 and the other end is an electrode (not shown) of the wiring board 2. A plurality of input conductor patterns 5 to be connected, and one end is connected to the IC chip 4 and the other end is the glass substrate 1a (or 1b)
And a large number of output conductor patterns 6 connected to each other, and a signal inspection terminal 7 is provided on the conductor pattern 6 at the aligned end. T
The conductor pattern 6 attached to the back surface of the AB tape 3 and the TA
The terminals 7 on the surface of the B tape 3 are electrically connected by a via hole (not shown).

The through holes 3a provided in the TAB tape 3 are for soldering the conductor patterns 5 to the electrodes of the wiring board 2. In the conventional TAB tape 3, the number of conductor patterns 6 formed at a fine pitch (for example, Regardless of the number (100 lines), a signal test in which a voltage is applied to the display electrode of the display panel 1 is possible only for the two lines on both outer sides, and the other 98 conductor patterns 6 cannot be tested.

In FIG. 10 (a), a liquid crystal display panel 8 in which a pair of glass substrates 8a and 8b on which a large number of display electrodes are formed is filled with liquid crystal, and a glass substrate 8a is used for driving the liquid crystal display panel. The IC chip 4 is mounted by COG technology.

In FIG. 10B, the glass substrate 8a is
A conductor pattern 5 having one end connected to the IC chip 4 and a plurality of output conductor patterns 6 having one end connected to the IC chip 4 and the other end connected to the display electrodes of the panel 8 are provided, and the conductor pattern 6 at the aligned end is provided. Is provided with a signal inspection terminal 7.

The display panel 8 in which the IC chip 4 is mounted on the glass substrate 8a has two groups on both outer sides regardless of the number (for example, 100) of the conductor patterns 6 of a group structure formed at a fine pitch.
Only for the book, it is possible to perform a signal test in which a voltage is applied to the display electrodes of the display panel 8, and the other 98 conductor patterns 6
For the above, the signal inspection cannot be performed.

[0010]

As described above,
In the conventional flat display panel, the IC chip 4
Since it is impossible to inspect the output of the IC chip 4 in the state of being connected, the probe is directly brought into contact with the output conductor pattern 6 of the strange IC chip 4 in the display state.

However, when the probe is brought into contact with the end portion of the display electrode, the display electrode may be damaged and an obstacle due to the connection between the display electrode and the output conductor pattern 6, for example, an adjacent display. Electrode for conductor pattern 6
There is a problem in that it is not possible to detect that a short circuit has been made at the connection part of.

[0012]

FIG. 1 is an explanatory view of the basic structure of the present invention. As shown in FIG. 1 (a), a liquid crystal display panel in which a pair of glass substrates 1a and 1b are filled with liquid crystal in a facing gap. 1 and the printed wiring board 2 are connected by a TAB tape 3, and an inspection wiring film 11 for the display electrode is connected to the substrate 1a on the surface of which the end portion of the display electrode is exposed.

The wiring film 11 is provided with an inspection probe contact terminal 14 which is connected to a conductor pattern (not shown) which is formed on the back surface of the wiring film 11 and is connected to the display electrode end of the substrate 1a, or
An inspection probe contacting via hole 15 communicating with the conductor pattern is provided.

In FIG. 1B showing the back surface of the first representative example of the wiring film 11, the wiring film 11a is an insulating film.
On the lower surface of 12, there are formed a number of conductor patterns 13 that are connected to overlap the display electrode ends of the substrate 1a, and an inspection probe contact terminal 14 that communicates with one end of the conductor pattern 13.

The wiring film 11a is, as shown in FIG.
Insulating film before or after connecting to the substrate 1a
The side where the terminals 14 are formed is folded back from the middle of the length direction of 12 to the surface side of the insulating film 12 so that each terminal 14 faces upward.

In FIG. 1 (d) showing the surface of the second representative example of the wiring film 11, the wiring film 11b has a large number of via holes 16 formed in the middle portion of the insulating film 12 in the longitudinal direction. A first conductor pattern 17 is formed on the back surface of the insulating film 12 so that one end communicates with the opposing via hole 16, and one end communicates with a large number of inspection probe contact terminals 14 arranged in a zigzag pattern on the surface of the insulating film 12. The second conductor pattern 18 is formed so that the other end communicates with the opposing via hole 16.

Since the conductor pattern 17 is overlapped and connected to the display electrode end portion of the substrate 1a, it has the same pitch as the electrode end portion, and the wiring film 11b does not need to be bent back in the wiring film 11a.

In FIG. 1 (e) showing the surface of the third representative example of the wiring film 11, a plurality of wiring films 11c penetrate the insulating film 12 in the vicinity of one end in the length direction of the insulating film 12. A via hole 15 is provided, and a conductor pattern 19 is formed on the back surface of the insulating film 12 so that one end communicates with the opposed via hole 15.

Since the conductor pattern 19 is overlapped and connected to the display electrode end of the substrate 1a, it has the same pitch as the electrode end, and the wiring film 11c, like the wiring film 11b, does not need to be folded back in the wiring film 11a. Is.

[0020]

The conductor pattern formed on the back surface of the wiring film according to the present invention is connected to the display electrode end of the flat display panel by using, for example, an anisotropic conductive film or the like. When the inspection probe is brought into contact with the contact via hole, the signal applied to the display electrode can be individually detected via the wiring film.

Therefore, all the display electrodes can be inspected, and the conventional problems of damaging the display electrodes by contacting the probes with the display electrodes can be solved.

[0022]

EXAMPLE FIG. 2 is a back view (a) of the wiring film according to the first embodiment of the present invention (a), a side view thereof as viewed in the direction of arrow A (b), and explanatory views (c) and (d) of the connecting method. 3 is a back view (a) of the wiring film according to the second embodiment of the invention, a side view thereof viewed from an arrow A (b), and an explanatory view of the connecting method (c), and FIG. 4 is a third embodiment of the present invention. FIG. 5 is a front view of a wiring film according to the present invention, FIG. 5 is a front view of a wiring film according to a fourth embodiment of the present invention, and FIG. 6 is a fourth view of the present invention.
7 is an explanatory view of a method of connecting wiring films according to the embodiment of FIG.
Is an illustration of a wiring film according to a fifth embodiment of the present invention (a)
FIG. 8 is a plan view of the wiring film according to the sixth embodiment of the present invention and FIG.
They are (b) and (c).

In FIGS. 2A and 2B, the wiring film 11a is for contacting a plurality of conductor patterns 13 with one end of the conductor pattern 13 on the lower surface of the insulating film 12 made of, for example, polyimide. A terminal (14) is formed, and a pair of alignment marks (20) are formed on the end of the insulating film (12).

Conductor pattern 13 and terminal 14 connected to display electrodes formed on the glass substrate (1a) of the liquid crystal display panel
Is formed by etching a metal foil attached to the insulating film 12.

2 (c) and 2 (d), the wiring film 11a in which the conductor pattern 13 is connected to the display electrode of the glass substrate 1a of the liquid crystal display panel has the conductor pattern 13 so that the terminal 14 faces upward. It is made by bending the middle part before or after connection.

The wiring film 11a is entirely mounted on the glass substrate 1a as shown in FIG.
As shown in (d), partly overlap with the TAB tape 3,
Overlap the conductor pattern 13 on the display electrode of the glass substrate 1a,
For example, connect with an anisotropic conductive tape, but before or after the connection, from the middle of the length direction of the insulating film 12 terminal
The side on which 14 is formed is bent back to the surface side of the insulating film 12 so that each terminal 14 faces upward so that the inspection probe can come into contact therewith.

3 (a) and 3 (b), the wiring film 11b has a large number of via holes 16 formed in a zigzag pattern in the middle portion of the insulating film 12 made of, for example, polyimide. A conductor pattern 17 communicating with the facing via hole 16 is formed, and one end communicates with a large number of inspection probe contact terminals 14 arranged in a staggered manner on the surface of the insulating film 12 and the other end communicates with the facing via hole 16. The conductor pattern 18 is formed.

The conductor patterns 17 and 18 are insulating films.
A metal foil attached to 12 is formed by etching, and a pair of alignment marks 20 are formed on the end of the insulating film 12.

Such a wiring film 11b is shown in FIG.
As shown in (c), partly overlap with TAB tape 3,
The conductor pattern 17 is overlaid on the display electrode of the glass substrate 1a,
For example, an anisotropic conductive tape is used for connection.

In FIG. 4, the wiring film 11c is provided with a plurality of staggered via holes 15 penetrating the insulating film 12 in the vicinity of one end in the length direction of the insulating film 12 made of, for example, polyimide. A conductor pattern 19 is formed on the back surface of the one end thereof so that one end thereof communicates with the opposing via hole 15.

The conductor pattern 19 is formed by etching a metal foil attached to the insulating film 12, and a pair of alignment marks 20 are formed at the end of the insulating film 12.
The wiring film 11c is connected to the glass substrate 1a similarly to the wiring film 11b described above, or is COG-mounted on the glass substrate 1a as shown in FIG.

In FIG. 5, a wiring film 11d is a modified example of the wiring film 11c. For example, a plurality of via holes 15 are provided in a zigzag pattern in the vicinity of the right end and the left end of the insulating film 12 made of polyimide, and the insulating film 12 is formed. A conductor pattern 19 communicating with the opposed via hole 15 is formed on the back surface of the.

The conductor pattern 19 is formed by etching a metal foil attached to the insulating film 12, and a pair of alignment marks 20 are formed at the end of the insulating film 12.
Such a wiring film 11d is an IC as shown in FIG.
The glass substrate 1a on which the chip 4 is mounted is COG mounted and used.

In FIG. 7 (a), the wiring film 11e is a modified example in which the conventional TAB tape 3 and the wiring film 11a according to the present invention are integrated, and is made of, for example, polyimide and has a long hole 12a for facilitating bending. The IC chip 4 is mounted on the insulating film 12, and the back surface of the insulating film 12 has an input conductor pattern 5 having one end connected to the IC chip 4 and one end connected to the IC chip 4 and a conductive pattern 13 at the extending portion. The probe contact terminal 14 is provided so that the output conductor pattern 6 and the outer end of the conductor pattern 13 communicate with each other.

The conductor patterns 5, 6, 13 and 14 are formed by etching a metal foil attached to the insulating film 12. As shown in FIG. 7 (b), such a wiring film 11e is laid over the glass substrate 1a and the printed wiring board 2 and connected, and the insulating film 12 is connected along the long hole 12a to each terminal 14 before or after the connection. Bend so that it faces upward.

In FIGS. 8A and 8B, a wiring film 11f which is a modified example of the wiring film 11b has a probe contact terminal 14 and a conductor pattern 18 'whose one end communicates with the terminal 14.
Insulating film 12 'with and formed on the surface, and a conductor pattern
A conductor pattern having a left end facing above the right end of 18 'and connecting the right end to a display electrode formed on the glass substrate (1a)
This is a structure in which an insulating film 12 ″ having 17 ′ formed on the back surface is attached.

As shown in FIG. 8C, the wiring film 11f is an insulating film 1 on which a conductor pattern 18 'is adhered and formed.
Anisotropic conductive film 21 is formed on the overlapping portion between 2'and the insulating film 12 "on which the conductive pattern 17 'is adhered.
It is created by sandwiching and sandwiching the insulating films 12 'and 12 ".

[0038]

As described above, according to the present invention, it is possible to perform 100% inspection on a large number of display electrodes formed on a flat display panel without damaging the display electrodes. ..

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a basic configuration of the present invention.

FIG. 2 is an explanatory view of a wiring film according to the first embodiment of the present invention.

FIG. 3 is an explanatory diagram of a wiring film according to a second embodiment of the present invention.

FIG. 4 is a front view of a wiring film according to a third embodiment of the present invention.

FIG. 5 is a front view of a wiring film according to a fourth embodiment of the present invention.

FIG. 6 is an explanatory view of a wiring film connecting method according to a fourth embodiment of the present invention.

FIG. 7 is an explanatory diagram of a wiring film and its connecting method according to a fifth embodiment of the present invention.

FIG. 8 is an explanatory diagram of a wiring film according to a sixth embodiment of the present invention.

FIG. 9 is an explanatory diagram of a liquid crystal display panel unit.

FIG. 10 is an explanatory diagram of a liquid crystal display panel on which an IC chip is directly mounted.

[Explanation of reference numerals] 1 is a liquid crystal display panel 1a, 1b is a glass substrate on which display electrodes are formed 2 is a printed wiring board 4 is an IC for driving a liquid crystal display panel 11,11a, 11b, 11c, 11d, 11e, 11f Is a display electrode inspection wiring film 12, 12 ', 12 "is a flexible insulating film 13, 17, 17', 18, 18 ', 19 is a conductor pattern 14 is a probe contact terminal 15 is a probe contact Via hole 16 is a via hole for connecting a conductor pattern.

Claims (5)

[Claims] 1. The back surface of the flexible insulating film (12) is connected to the display electrode of the flat display panel by overlapping one end thereof with the other end communicating with the probe contact terminal (14). A large number of conductor patterns (13) are formed, and the probe contact terminals (14) are arranged in a zigzag pattern in the alignment direction of the conductor patterns (13). A flat display panel, characterized in that the insulating film (12) of the portion where the probe contact terminal (14) is formed is bent back from the middle part to the surface side of the insulating film (12). Wiring film for inspection of display electrodes. 2. A flexible insulating film (12) is provided with a large number of first conductor patterns (17) on the back surface thereof so as to be connected to display electrodes of a flat display panel in an overlapping manner. On the surface of 12), one end is connected to the probe contact terminals (14) arranged in a zigzag manner, and the other end is a large number of second conductor patterns corresponding to the respective first conductor patterns (17).
(18) is formed, and the corresponding 1st conductor pattern (17) and second
And the conductor pattern (18) are connected by a via hole (16) provided in the insulating film (12), the wiring film for inspecting the display electrode of the flat display panel. 3. The flexible insulating film (12) is provided with a large number of conductor patterns (19) on the back surface thereof so as to be connected to display electrodes of a flat display panel so as to overlap the insulating film (12).
The conductor pattern (19) is connected to each, and a via hole (15) for contacting the inspection probe of the display electrode is provided in a zigzag pattern, The display electrode of the flat display panel, Inspection wiring film. 4. A flexible insulating film (12) is provided with a large number of conductive patterns (19) on the back surface thereof so as to be connected to display electrodes of a flat display panel so as to overlap the insulating film (12).
A wiring film for inspecting display electrodes of a flat display panel, characterized in that via holes (15) connected to the conductor pattern are arranged in a staggered pattern, and the via holes (15) are for probe contact. .. 5. A plurality of first conductor patterns (17 ') are formed on the back surface of the first flexible insulating film (12 ") so as to be overlapped and connected to the display electrodes of the flat display panel. On the surface of the flexible insulating film (12 '), a large number of probe contact terminals (14) arranged in a staggered manner and one end of which are connected to the end of the first conductor pattern (17') A plurality of second conductor patterns (18 ') whose ends communicate with the probe abutting terminals (14) are formed, and the opposite ends of the first conductor patterns (17') and the second conductor patterns (18 ') are formed. A wiring film for inspecting display electrodes of a flat display panel, characterized in that one end of a conductor pattern (18 ') is connected.