JP2001056477A - Liquid crystal display device and inspection method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To make it possible to judge always correctly without requiring skill whether or not a positional deviation of connection of TCP to a liquid crystal display panel is within a tolerable range, in a liquid crystal display device wherein TCP is connected to the liquid crystal display panel. SOLUTION: According to this inspection method, when an inspection wiring 26 of TCP is arranged between an inspection terminal 14b and a power supply terminal 14a of a liquid crystal display panel 11 but is not connected with both of them, the inspection wiring 26 is brought into non-conduction with a power supply wiring 25. On the other hand, the inspection wiring 26 is connected with either the inspection terminal 14b or the power supply terminal 14a, the inspection wiring 26 and the power supply wiring 25 are brought into conduction via only the power supply terminal 14a or via the inspection terminal 14b and the power supply terminal 14a. As the result of this, it is possible by an electrical inspection to judge whether or not a positional deviation of a connection state of TCP 21 to the liquid crystal display panel is within a tolerable range.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a liquid crystal display device and a method for inspecting the same.

[0002]

2. Description of the Related Art FIG. 3 is a plan view showing a part of an example of a conventional liquid crystal display device. This liquid crystal display device includes an active matrix type liquid crystal display panel 1.
The liquid crystal display panel 1 has a structure in which two lower and upper substrates made of glass, resin, or the like are bonded to each other, and a liquid crystal (not shown) is sealed therebetween. In this case, the right side portion and the lower side portion of the lower substrate 2 protrude from the upper substrate 3 to form protrusions 2a and 2b.

The TC at three predetermined locations on the upper surface of the projection 2a on the right side and at the predetermined six locations on the upper surface of the projection 2b on the lower side.
The output side of P (tape carrier package) 4 is joined via an anisotropic conductive adhesive (not shown). TCP4 is
The structure is such that a semiconductor chip 6 for driving a liquid crystal is mounted on a film substrate 5. Each input side of the TCP 4 (lead extended over the slit portion) is joined to each predetermined location on the upper surface of the substantially L-shaped first flexible wiring board 7 via solder (not shown). One end of the second flexible wiring board 8 is provided with an anisotropic conductive adhesive (not shown) at a predetermined position on the upper surface of the corner of the first flexible wiring board 7.
Are joined through. The other end of the second flexible wiring board 8 is connected to a circuit board (not shown).

In the conventional liquid crystal display device, when the respective output sides of the nine TCPs 4 are joined to the projections 2a, 2b of the liquid crystal display panel 1, first, the respective input sides of the nine TCPs 4 are connected. Are aligned with respective predetermined locations on the upper surface of the first flexible wiring board 7 and then joined via solder. Then, the respective output sides of the nine TCPs 4 are connected to the projections 2a and 2b of the liquid crystal display panel 1. The entire surface is aligned with each predetermined position on the upper surface and then joined via an anisotropic conductive adhesive.

As described above, each output side of the nine TCPs 4 is entirely aligned with each predetermined position on the upper surfaces of the protruding portions 2a and 2b of the liquid crystal display panel 1, and then is placed through the anisotropic conductive adhesive. Therefore, the positional deviation of the bonding state of each TCP 4 with respect to the liquid crystal display panel 1 is not always within the allowable range. Therefore, an inspection as to whether or not the positional deviation of the bonding state of the individual TCPs 4 with respect to the liquid crystal display panel 1 is within an allowable range is performed by visual inspection with a microscope.

[0006]

However, in such a conventional inspection method, since visual inspection with a microscope is required, skill is required.
However, there is a problem that it cannot always be accurately determined whether or not the positional deviation of the bonding state with respect to the liquid crystal display panel 1 is within an allowable range. SUMMARY OF THE INVENTION It is an object of the present invention to make it possible to always accurately judge whether or not a positional shift of a bonding state of a flexible wiring board such as a TCP or the like to a liquid crystal display panel is within an allowable range without skill. It is.

[0007]

According to a first aspect of the present invention, there is provided a liquid crystal display device comprising: a liquid crystal display panel in which one of two substrates adhered to each other has a projecting portion projected from the other substrate; In a liquid crystal display device having a semiconductor chip for driving liquid crystal mounted on a film substrate and a flexible wiring substrate having an output side bonded to the protruding portion of the one substrate, A signal terminal and a test pattern are formed, the test pattern has a test terminal connected outside the region of the opening in contact with an end and an adjacent terminal adjacent to the test terminal, and the signal pattern is formed on the film substrate. Signal wiring of the film substrate in a state in which a wiring for inspection, a wiring for inspection and an adjacent wiring adjacent to the wiring for inspection are provided, and the wiring for inspection on the film substrate corresponds to an opening of the one substrate. And the adjacent wiring is connected to the corresponding signal terminal and the adjacent terminal of the one substrate, and the width of the opening formed in the one substrate is larger than the width of the inspection terminal formed in the film substrate. 2 of misalignment tolerance
It is twice as large. The inspection method for a liquid crystal display device according to the invention according to claim 4, wherein the end of one of the two substrates bonded to each other is projected from the other substrate, and the inspection terminal and the inspection terminal are provided on the projected portion. An adjacent terminal adjacent to the inspection terminal is provided, and the inspection terminal is connected to the adjacent terminal outside the area adjacent to the inspection terminal. Semiconductor chip is mounted, and the output side of the flexible wiring board provided with the inspection wiring and the adjacent wiring adjacent to the inspection wiring on the film substrate,
The inspection wiring is disposed between the inspection terminal and the adjacent terminal and is not connected to any of them, and when the adjacent wiring is connected to the adjacent terminal, the inspection wiring and the adjacent wiring are connected to each other. By electrically inspecting the non-conduction state between the adjacent wirings, it is determined that the positional deviation of the bonding state of the flexible wiring board with respect to the liquid crystal display panel is within an allowable range. When the wiring for inspection is connected to one of the inspection terminal and the adjacent terminal, and the adjacent wiring is connected to the adjacent terminal, the distance between the inspection wiring and the adjacent wiring is reduced. By electrically inspecting the conductive state, it is determined that the positional deviation of the bonding state of the flexible wiring board with respect to the liquid crystal display panel is out of an allowable range. According to the present invention, the inspection terminal and the adjacent terminal adjacent to the inspection terminal are provided on the protruding portion of the one substrate of the liquid crystal display panel, and the inspection terminal is connected to the adjacent terminal outside the adjacent region, and the flexible wiring is provided. When the inspection wiring and the adjacent wiring adjacent to the inspection wiring are provided on the film substrate of the substrate, and the flexible wiring board is bonded to the liquid crystal display panel, the connection between the inspection wiring and the adjacent wiring is conductive or non-conductive. By electrically inspecting the state of the flexible wiring board, it is possible to determine whether or not the positional shift of the bonding state of the flexible wiring board to the liquid crystal display panel is within an allowable range. It is always possible to accurately determine whether or not the state displacement is within the allowable range.

[0008]

FIG. 1A is a transmission plan view of a main part of a liquid crystal display device according to an embodiment of the present invention, and FIG. 1B is a transmission plan view in an exploded state. Things. In this liquid crystal display device, the vicinity of the end of the protruding portion 12 (corresponding to the reference numeral 2a or 2b in FIG. 3) of the liquid crystal display panel 11 is formed with a plurality of TCP bonding regions. Has a number of signal terminals 13 extending into a display area (not shown);
Inspection patterns 14 arranged on both sides of the signal terminals 13 are formed. Each test pattern 14 does not extend to the display area unlike the signal terminal 13, and terminates at the maximum in the area of the protrusion 12. In addition, each inspection pattern 14 has an opening 1 in contact with an end of the protrusion 12.
And a relatively wide power supply terminal (adjacent terminal) 14a formed on the signal terminal 13 side of the opening 15
And a slightly narrower inspection terminal 14 b formed on the opposite side of the opening 15 from the signal terminal 13. in this case,
Between each signal terminal 13 and between the signal terminal 13 and the power supply terminal 1
The interval between 4a is the same as the line width of the signal terminal 13. Also, the width of the opening 15, in other words, the distance between the power supply terminal 14 a and the test terminal 14 b of the test pattern 14 is twice the distance between the signal terminals 13, that is, the line width of the signal terminal 13. The power supply terminal 14a of the test pattern 14 is connected to a common potential via a power supply line formed on the film substrate 22 of the TCP 21, as described later. Here, the reason why the power supply terminal 14a is formed wider than the other terminals is that a larger current flows through the power supply terminal than the other terminals.

On the other hand, on the lower surface of the film substrate 22 constituting the TCP 21, a large number of signal wirings 23 are arranged along one side end, and power supply wirings are provided on both sides of the signal wirings 23, respectively. (Adjacent wirings) 24 and 25 and inspection wirings 26 are provided. In this case, the signal wiring 2
3. The power supply wirings 24 and 25 and the inspection wiring 26 are arranged at the same intervals as the line width of the signal wiring 23, respectively. That is, the inspection wiring 26 and the power supply wiring 25
Between the power supply wiring 25 and the power supply wiring 24, the power supply wiring 2
The intervals between the wirings 4 and the signal wirings 23 and between the signal wirings 23 are the same as the line widths of all the signal wirings 23.
The line width of the signal wiring 23 is the same as the line width of the signal terminal 13 of the liquid crystal display panel 11. The line width of the inspection wiring 26 is the same as the line width of the signal wiring 23, and the power supply wiring 2
The line widths of the lines 4 and 25 are larger than the line width of the signal wiring 23. The inspection wiring 26 and the power supply wirings 24 and 25 are
The film substrate 22 is provided from the output side to the input side.

[0010] Now, as shown in FIG.
1 is bonded to the upper surface of the projection 12 of the liquid crystal display panel 11 via an anisotropic conductive adhesive (not shown),
When there is no horizontal displacement of the TCP 21 with respect to the liquid crystal display panel 11, the inspection wiring 26 of the TCP 21 is arranged at the center of the opening 15 of the liquid crystal display panel 11,
Neither the inspection terminal 14b nor the power supply terminal 14a is connected. In this state, the signal wiring 23 and the power supply wirings 24 and 25 of the TCP 21 are not displaced in the left and right direction with respect to the signal terminal 13 and the power supply terminal 14a of the liquid crystal display panel 11 without any displacement. Will be connected via.

On the other hand, for example, as shown in FIG.
1 is a signal terminal 1 to the right with respect to the liquid crystal display panel 11.
When the distance is shifted by of the interval between the three (the width of the opening 15 １ ／), the inspection wiring 26 on the left side of the TCP 21 is connected to the power supply terminal 14 a on the left side of the liquid crystal display panel 11, and the inspection on the right side is performed. The wiring 26 is connected to the inspection terminal 14b on the right side of the liquid crystal display panel 11. And in this state, TC
The signal wiring 23 and the power supply wirings 24 and 25 of P21 are the signal terminal 13 and the power supply terminal 14 of the liquid crystal display panel 11.
a is shifted to the right by 1/2 of the interval between the signal terminals 13 and connected via an anisotropic conductive adhesive.

Here, with reference to the state shown in FIG. 1A, the positional deviation of the bonding state of the TCP 21 with respect to the liquid crystal display panel 11 is 1/1 / the distance between the signal terminals 13 in the left-right direction.
The case where it is less than 2 is within the allowable range, and the case where it is more than that, ie, 1/2 or more of the interval between the signal terminals 13 is outside the allowable range.

The inspection wiring 26 is connected to the inspection terminal 14.
b and the power supply terminal 14a and are not connected to any of them, and when the power supply wirings 24 and 25 are connected to the power supply terminal 14a, the inspection wiring 26 and the power supply wiring 25 (Or 24) is in a non-conductive state.
On the other hand, when the inspection wiring 26 is connected to one of the inspection terminal 14b and the power supply terminal 14a and the power supply wirings 24 and 25 are connected to the power supply terminal 14a, the inspection wiring 26 and the power supply wiring 25 (or 24) are brought into conduction through only the power supply terminal 14a or through the inspection terminal 14b and the power supply terminal 14a.

Therefore, the inspection wiring 26 and the power supply wiring 25 are used.
(Or 24) is electrically inspected whether it is in a non-conductive state or a conductive state.
It can be determined whether or not the positional deviation of the bonding state with respect to the liquid crystal display panel 11 is within an allowable range. In this case, since the electrical inspection is performed, the determination as to whether or not the bonding state of the TCP 21 to the liquid crystal display panel 11 is within an allowable range can always be accurately performed without skill.

In this embodiment, the inspection pattern 14 is provided on both sides of the signal terminal 13 in each TCP bonding area. This is because, in general, when a flexible wiring board is bonded by heating and pressing. Since the flexible wiring board expands (for example, about 0.1%), the signal wiring 23 formed on the flexible wiring board is formed in advance at a pitch smaller by this extension, but this extension is also used during actual bonding. Due to variations due to conditions,
This is because it is necessary to perform an inspection on both sides of the signal terminal 13 as an accurate inspection in consideration of the initial displacement and the extension at the time of joining.

The reason why the power supply wirings 24 and 25 are separated into two is that when the film substrate 22 is joined to the liquid crystal display panel with an anisotropic conductive adhesive, the power supply terminals 14a are wide. , A large amount of conductive particles dispersed in the anisotropic conductive adhesive will flow to both ends, causing a short circuit or lowering the adhesive force. This is to eliminate the problem.

In the electrical inspection as described above, the inspection wiring 26 and the power supply wirings 24 and 25 are actually
The first flexible wiring board 7 will be described with reference to FIG.
Is connected to the second flexible wiring board 8 via the second flexible wiring board 8, so that the probe pins are brought into contact with the second flexible wiring board 8 to perform the connection. In addition, this electrical inspection is performed, for example, in the state shown in FIG.
When performing the display inspection of (11), the display inspection may be performed at the same time. In any case, the inspection may be performed via the first flexible wiring board 7 without joining the second flexible wiring board 8 to the first flexible wiring board 7.

[0018]

As described above, according to the present invention, an inspection terminal and an adjacent terminal adjacent to the inspection terminal are provided on the protruding portion of one substrate of the liquid crystal display panel, and the inspection terminal is adjacent to the inspection terminal. When the flexible wiring board is connected to the liquid crystal display panel, the inspection wiring and the adjacent wiring are connected to the terminal outside the adjacent area, and the inspection wiring and the adjacent wiring adjacent to the inspection wiring are provided on the film substrate of the flexible wiring board. By electrically inspecting whether the conductive state between the flexible wiring board and the liquid crystal display panel is in a conductive state or a non-conductive state, it is possible to determine whether the positional deviation of the bonding state of the flexible printed circuit board to the liquid crystal display panel is within an allowable range. Therefore, it is possible to always accurately determine whether or not the positional deviation of the bonding state of the flexible wiring board with respect to the liquid crystal display panel is within an allowable range without skill. Kill.

[Brief description of the drawings]

FIG. 1A is a transmission plan view of a main part of a liquid crystal display device according to an embodiment of the present invention, and FIG. 1B is a transmission plan view in a disassembled state.

FIG. 2 is a transmission plan view showing a case where a bonding state of a TCP to a liquid crystal display panel is shifted to the right to some extent.

FIG. 3 is a plan view of a part of an example of a conventional liquid crystal display device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 11 Liquid crystal display panel 12 Projection part 13 Signal terminal 14 Inspection pattern 14a Power supply terminal 14b Inspection terminal 15 Opening 21 TCP 22 Film substrate 23 Signal wiring 24, 25 Power supply wiring 26 Inspection wiring

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2H092 GA48 GA51 HA25 JB77 MA32 MA57 NA16 NA30 PA06 5C094 AA42 AA43 AA48 BA03 BA43 CA19 DA09 DB02 DB05 EA03 EA10 FA01 FB12 GB01 5G435 AA17 BB12 CC09 EE13 EE10 KK10

Claims (6)

[Claims] 1. A liquid crystal display panel in which one of the two substrates adhered to each other has a projecting portion projected from the other substrate, and a semiconductor chip for driving a liquid crystal mounted on a film substrate. In a liquid crystal display device having a flexible wiring board bonded to a protruding portion of the one substrate, a signal terminal and a test pattern are formed on the protruding portion of the one substrate, and the test pattern has an end. An inspection terminal connected outside the region of the opening in contact with the portion and an adjacent terminal adjacent to the inspection terminal, and the signal wiring, the inspection wiring, and the adjacent wiring adjacent to the inspection wiring are provided on the film substrate. The signal wiring and the adjacent wiring of the film substrate are provided in the state where the inspection wiring of the film substrate corresponds to the opening of the one substrate, and the corresponding signal terminal and the adjacent wiring of the one substrate are provided. Wherein the width of the opening formed in the one substrate is larger than the width of the inspection terminal formed in the film substrate by twice the tolerance for positional deviation. Display device. 2. The invention according to claim 1, wherein two adjacent sides of the one substrate are protruded from the other substrate, and a plurality of output sides of the flexible wiring substrate are provided on each of the protruding portions. A liquid crystal display device wherein the input sides of all the flexible wiring boards are joined to another substantially L-shaped flexible wiring board. 3. The method according to claim 1, wherein
The liquid crystal display device, wherein the adjacent wiring is a power supply wiring, and the adjacent terminal is a power supply terminal. 4. An end portion of one of the two substrates bonded to each other is projected from the other substrate, and an inspection terminal and an adjacent terminal adjacent to the inspection terminal are provided on the projected portion. A semiconductor chip for driving liquid crystal is mounted on a film substrate on a protruding portion of the one substrate of the liquid crystal display panel in which the inspection terminal is connected to the adjacent terminal outside an adjacent region; The output side of the flexible wiring board provided with the inspection wiring and the adjacent wiring adjacent to the inspection wiring is connected, and the inspection wiring is disposed between the inspection terminal and the adjacent terminal. And when the adjacent wiring is connected to the adjacent terminal, by electrically inspecting the non-conductive state between the inspection wiring and the adjacent wiring, Flexi It is determined that the positional deviation of the bonding state of the sibling wiring board with respect to the liquid crystal display panel is within an allowable range, while the inspection wiring is connected to one of the inspection terminal and the adjacent terminal, and When the adjacent wiring is connected to the adjacent terminal, the liquid crystal display of the flexible wiring board is electrically inspected by electrically inspecting a state of continuity between the inspection wiring and the adjacent wiring. A method for inspecting a liquid crystal display device, wherein it is determined that a positional deviation of a bonding state with respect to a panel is out of an allowable range. 5. The flexible wiring board according to claim 4, wherein two adjacent sides of the one board are projected from the other board, and a plurality of output sides of the flexible wiring board are provided on each of the projected sections. And bonding each input side of all the flexible wiring boards to another substantially L-shaped flexible wiring board before the bonding, and performing the test in this state. Method. 6. The invention according to claim 4, wherein
The inspection method for a liquid crystal display device, wherein the adjacent wiring is a power supply wiring, and the adjacent terminal is a power supply terminal.