JP4848588B2 - LCD module - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid crystal display module that is used in a display unit such as a mobile phone, for example, so that an image can be displayed with liquid crystal.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as a liquid crystal display module that is used, a liquid crystal display panel that includes a liquid crystal display panel in which liquid crystal is sealed and a flexible substrate that is integrally fixed thereto is widely known. The liquid crystal display panel has a common and segment electrode arrangement for driving the sealed liquid crystal, and can display an image by liquid crystal in response to energization of these electrodes. The flexible substrate is made of a deformable resin sheet, on which an IC is mounted and a wiring pattern is formed. Some ICs are mounted on a glass substrate of a liquid crystal display panel.
[0003]
The wiring pattern of the flexible substrate is conductively connected to the common and segment wiring terminals of the liquid crystal display panel. This conductive connection is such that the wiring pattern of the flexible substrate is aligned with the wiring terminal formed on the glass substrate of the liquid crystal display panel and adhered by an anisotropic conductive adhesive.
[0004]
FIG. 6 is a schematic plan view showing a connection structure between the liquid crystal display panel and the flexible substrate.
[0005]
As shown in FIG. 6A, a large number of wiring terminals 53 are formed on the surface of the glass substrate 52 of the liquid crystal display panel 51 at regular intervals. On the other hand, wiring terminals 55 of a wiring pattern are formed on the back surface side of the flexible substrate 54 as indicated by hatching in the drawing. The wiring terminals 55 are formed at the same wiring interval as the wiring terminals 53 of the liquid crystal display panel 51. And as shown to (a) of the figure, if the wiring terminals 53 and 55 are joined and it joins with an anisotropic conductive adhesive, the wiring terminals 53 and 55 will carry out conductive connection, without short-circuiting.
[0006]
On the other hand, as shown in FIG. 5B, for example, when the flexible substrate 54 is connected to the glass substrate 52 so as to be shifted to the left, two wiring terminals 55 are adjacent to each other on the glass substrate 52. The wiring terminals 53 and 55 are short-circuited. The liquid crystal display module that has been short-circuited in this way is removed in the inspection process, and only the product in which the wiring terminals 53 and 55 are aligned and connected within an allowable range as shown in FIG. Will be shipped as.
[0007]
[Problems to be solved by the invention]
Recently, a liquid crystal display module capable of displaying a clearer image by increasing the number of pixels of the liquid crystal display panel or displaying a color image by inputting R (red), G (green), and B (blue) image signals. Is in the development stage. In order to increase the number of pixels and display a color image, it is necessary to reduce the distance between the wiring terminals 53 and 55, that is, to make a fine pitch.
[0008]
Thus, when the pattern of the wiring terminals 53 and 55 is made fine pitch, a mounting defect often occurs due to a slight misalignment between them. And although it became a pass product in the inspection process, since the interval between the wiring terminals 53 and 55 is very small, there is a risk of causing a mounting failure due to a change with time after shipment. That is, if the wiring terminals 53 and 55 are shifted beyond the allowable range even if they are not short-circuited, a short circuit is caused.
[0009]
SUMMARY OF THE INVENTION An object of the present invention is to provide a highly reliable liquid crystal display module that can detect a mounting deviation exceeding an allowable range.
[0010]
[Means for Solving the Problems]
The present invention comprises a liquid crystal display panel composed of laminated glass substrates and a flexible substrate connected to the glass substrate, and a large number of wirings arranged and arranged at fixed intervals on each of the glass substrate and the flexible substrate. In the liquid crystal display module that conducts by superposition of terminals, an adjacent pair of the wiring terminals has an interval shorter than the arrangement interval.
[0011]
Further, a liquid crystal display module in which an IC is mounted on the glass substrate or the flexible substrate, and the bump electrodes of the IC are made conductive by superposition of a large number of wiring terminals formed on the glass substrate or the flexible substrate at a constant arrangement interval. In the above, the adjacent pair of the wiring terminals may be configured to have an interval shorter than the arrangement interval.
[0012]
According to the present invention, a mounting deviation exceeding an allowable range can be detected, and a highly reliable liquid crystal display module can be obtained.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
1st invention of this application consists of the liquid crystal display panel comprised by the laminated | stacked glass substrate, and the flexible substrate connected with the said glass substrate, and was formed in each of the said glass substrate and a flexible substrate with fixed arrangement | positioning space | interval. In the liquid crystal display module that conducts by overlapping the wiring terminals, the adjacent pair of the wiring terminals is set to be shorter than the arrangement interval, and the interval is shorter than the arrangement interval of the wiring terminals. Since the adjacent pair of wiring terminals short-circuit the wiring terminals with a positional shift shorter than the arrangement interval of the wiring terminals, it is possible to tighten the management of mounting defects and prevent mounting defects due to changes over time. Have.
[0014]
The second invention of the present application comprises a liquid crystal display panel constituted by laminated glass substrates and a flexible substrate connected to the glass substrate, and an IC is mounted on the glass substrate or the flexible substrate, and the IC In a liquid crystal display module in which a plurality of wiring terminals formed on the glass substrate or the flexible substrate at a predetermined arrangement interval are connected to the bump electrodes of the liquid crystal display module, adjacent pairs of the wiring terminals are made shorter than the arrangement interval. Adjacent wiring terminals that are shorter than the arrangement interval of the wiring terminals are short-circuited between the wiring terminals via the bump electrodes with a positional deviation shorter than the arrangement interval of the wiring terminals. Management of defects can be made stricter, and short circuits due to changes over time can be prevented.
[0015]
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0016]
FIG. 1 is a perspective view schematically showing a liquid crystal display module according to an embodiment of the present invention.
[0017]
In FIG. 1, a liquid crystal display panel in which liquid crystal is sealed is constituted by a pair of glass substrates 1 and 2, and a flexible substrate 3 is connected to one edge of the glass substrate 1. On the flexible substrate 3, a driving IC 3 a is mounted, and input terminals 3 b and common and segment wiring patterns 3 c and 3 d are formed, respectively. These wiring patterns 3c and 3d are conductively connected to the wiring pattern formed on the glass substrate 1 side. FIG. 2 shows an enlarged plan view of the main part of the wiring pattern 3c and the wiring pattern on the glass substrate 1 side.
[0018]
In FIG. 2, the wiring pattern formed on the glass substrate 1 side is formed so that wiring terminals 4 having a certain width are parallel to each other with a certain spacing P. Among these wiring terminals 4, the second and third wiring terminals 4 a and 4 b from the right side are dummy and are not actually connected to the electrode pattern of the glass substrate 1. On the other hand, wiring terminals 5 parallel to each other are also formed on the flexible substrate 3. Among these wiring terminals 5, the second and third wiring terminals 5a and 5b from the right side are for short circuit detection, and the remaining wiring terminals 5 are all the same width as the wiring terminals 4 on the glass substrate 1 side. The arrangement interval is also P. The widths of the wiring terminals 5a and 5b are slightly larger than the widths of the other wiring terminals 5. The distance between adjacent wiring terminals 5 is P, but the distance Q between the wiring terminals 5a and 5b is larger than the distance P. Also short. The distance between the rightmost wiring terminal 5 and the wiring terminal 5a and the distance between the wiring terminal 5b and the adjacent wiring terminal 5 are both the distance P, and only the distance between the wiring terminals 5a and 5b is greater than the distance P. The arrangement relationship is short Q. As shown in FIG. 1, the wiring terminals 5a and 5b are electrically connected to a pair of short-circuit detection lands 6a and 6b arranged near the IC 3a.
[0019]
In the above configuration, when the flexible substrate 3 is raised vertically with respect to the glass substrate 1 in the posture shown in FIG. 2 and the wiring terminals 4 and 5 are overlapped, the wiring terminals 5 a and 5 b of the flexible substrate 3 are the glass substrate 1. It is joined on the wiring terminals 4a and 4b on the side. Then, the remaining wiring terminals 4 and 5 are also joined in perfect alignment. Therefore, the group of wiring terminals 4 and 5 are joined in the form as shown in FIG. 3A, and mounting defects such as a short circuit of the wiring terminals 5 do not occur.
[0020]
On the other hand, as shown in FIG. 3B, when the flexible substrate 3 is slightly shifted to the left with respect to the glass substrate 1, the wiring terminals 5a on the flexible substrate 3 side are simultaneously connected to the wiring terminals 4a and 4b on the glass substrate 1 side. The overlapping wiring terminals 5a and 5b are short-circuited. That is, as shown in an enlarged view in FIG. 4A, the flexible substrate 3 is not on the left side of the short interval Q between the wiring terminals 5a and 5b, rather than the positional shift corresponding to the interval P between the wiring terminals 4 and 5. When the position is shifted, the wiring terminal 5a is simultaneously connected to the wiring terminals 4a and 4b on the glass substrate 1, and the wiring terminal 5b connected to the wiring terminal 4b is short-circuited with the wiring terminal 5a.
[0021]
When the flexible substrate 3 is slightly shifted to the right side, the wiring terminal 5b on the flexible substrate 3 side is electrically connected to the wiring terminals 4a and 4b on the glass substrate 1 side as shown in FIG. Is short-circuited via the wiring terminal 4a.
[0022]
Such a short circuit can be detected by utilizing a tester or the like brought into contact with the short circuit detection lands 6a and 6b so that the resistance value becomes zero.
[0023]
As described above, the interval Q between the wiring terminals 5a and 5b formed on the flexible substrate 3 side is smaller than the interval P between the wiring terminals 4 on the glass substrate 1 side. For this reason, when the flexible substrate 3 is displaced to the left and right with respect to the glass substrate 1 in a range shorter than the interval P, the wiring terminals 5a and 5b are short-circuited via any of the wiring terminals 4a and 4b. Therefore, even if the position difference of the flexible substrate 3 with respect to the glass substrate 1 is slight, a short circuit between the wiring terminals 4 and 5 can be known.
[0024]
In this way, a short circuit can be detected by a positional shift between the glass substrate 1 and the flexible substrate 3 that is shorter than the interval P between the wiring terminals 4 and 5. For this reason, in the conventional example shown in FIG. 6, the product determined to be acceptable is based on the interval between the wiring terminals 53 and 55, whereas in the present invention, the wiring terminal 4a in a range shorter than this interval is used. , 4b, 5a, 5b is used as a reference, so that if there is a positional deviation exceeding the allowable range, it is determined as a rejected product. Therefore, it is possible to detect a short circuit by the wiring terminals 4a, 4b, 5a, and 5b even for products that are not actually short-circuited due to the covering of the wiring terminals 4 and 5 with the interval P, and prevent a short circuit due to a change with time after the product is shipped. Is planned.
[0025]
FIG. 5 is a plan view of the main part showing the conductive structure between the bump electrode and the wiring pattern formed on the IC 3a.
[0026]
A group of bump electrodes 7a, 7b, 7c,... Is formed at a constant pitch A on the IC 3a. Then, wiring terminals 8a, 8b, 8c,... Are patterned on the flexible substrate 3 so as to be electrically connected to the bump electrodes 7a, 7b, 7c in the group of the bump electrodes 7a, 7b, 7c,. ing. The wiring terminals 8a, 8b, 8c,... Are arranged at a constant interval A, but the wiring terminals 8b and 8c are formed to have a spacing B shorter than the spacing A as shown in the figure.
[0027]
Also in this example, as shown in FIG. 6A, the wiring terminals 8a, 8b, and 8c are overlapped with the bump electrodes 7a, 7b, and 7c, respectively, so that conduction without a short circuit is obtained. When the wiring pattern including the wiring terminals 8a, 8b, and 8c is slightly displaced to the right as shown in FIG. 5B and exceeds the allowable range, the wiring terminal 8b is simultaneously conducted to the bump electrodes 7b and 7c to be wired. Terminals 8b and 8c are short-circuited. Conversely, when the wiring pattern including the wiring terminals 8a, 8b, and 8c is shifted to the left and exceeds the allowable range, the wiring terminal 8c is electrically connected to the bumps 7b and 7c, and the wiring terminals 8b and 8c are short-circuited.
[0028]
As described above, the distance B between the wiring terminals 8b, 8c is made shorter than the distance A between the bump electrodes 7a, 7b, 7c,..., So that the wiring terminals 8a, 8b, 8c,. A short circuit of the wiring pattern due to the group can be reliably detected.
[0029]
【The invention's effect】
In the present invention, since a pair of adjacent wiring terminals that are electrically connected to the wiring terminals of the glass substrate and the flexible substrate and the bump electrodes of the IC are shorter than the arrangement interval of the wiring terminals, the positional deviation when mounting is performed. When the value exceeds the allowable range, a short circuit can be detected. For this reason, it can be determined as an unacceptable product in the inspection process including the case where it is mounted with a small misalignment and may be short-circuited due to changes over time, and the reliability of the product can be greatly improved.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an outline of a liquid crystal display module of the present invention. FIG. 2 is a plan view showing an enlarged main portion of a wiring terminal formed on a glass substrate and a flexible substrate. FIG. 4B is a plan view of the main part showing a state where the wiring terminals on the flexible substrate side are not short-circuited. FIG. 4B is a plan view of the main part showing a state where the wiring terminals on the glass substrate side and the flexible substrate side are short-circuited. (A) Enlarged view of the main part showing the short circuit condition when the flexible board is shifted to the left side (b) Enlarged view of the main part showing the short circuit condition when the flexible board is slid to the right side [FIG. 5] (a) IC FIG. 6B is a plan view of the main part showing a short circuit of the wiring terminal with respect to the bump electrode of the IC. FIG. 6A is a conventional example and the wiring terminal is matched. Of the main part showing the state Rear view (b) a plan view of a main part interconnect with a conventional terminal showing a state of a short circuit [Description of symbols]
1, 2 Glass substrate 3 Flexible substrate 3a IC
3b Input terminals 3c, 3d Wiring patterns 4, 4a, 4b Wiring terminals 5, 5a, 5b Wiring terminals 6a, 6b Short-circuit detection lands 7a, 7b, 7c Bump electrodes 8a, 8b, 8c Wiring terminals

Claims (1)

It consists of a liquid crystal display panel composed of laminated glass substrates and a flexible substrate connected to the glass substrate, and is made conductive by the polymerization of a large number of wiring terminals formed at regular intervals on each of the glass substrate and the flexible substrate. In the liquid crystal display module, the wiring terminals formed on the glass substrate have the same width, and a pair of adjacent ones of the wiring terminals is a dummy pattern, and a pair of short-circuit detection is provided at a position corresponding to the dummy pattern of the flexible substrate. The wiring terminals for short circuit detection are made wider than the widths of the other wiring terminals, and the interval between the pair of wiring terminals for short circuit detection is narrower than the arrangement interval of the other wiring terminals. A liquid crystal display module characterized by having an interval.

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