JP4503766B2 - Terminal connection structure of LCD panel - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a terminal connection structure of a liquid crystal display panel for connecting a plurality of lead terminals formed on electrode terminal portions of a liquid crystal display panel and a plurality of lead terminals of a wiring board, and in particular, both lead terminals are electrically conductive particles. The present invention relates to an improvement in a terminal connection structure of a liquid crystal display panel that is connected by a resin mixed with.
[0002]
[Prior art]
In general, in a manufacturing process of a liquid crystal display element, a plurality of lead terminals formed on an electrode terminal portion of a liquid crystal display panel, a plurality of lead terminals of a wiring board, and a wiring board such as a flexible wiring board or a tape carrier package (TCP) There is a process of connecting. As this connection method, for example, an ultraviolet curable resin mixed with conductive particles is applied or printed on the electrode terminal portion of the liquid crystal display panel, a wiring board is joined to the liquid crystal display panel, and ultraviolet irradiation is performed while pressing. The ultraviolet curable resin was cured, and the mutual lead terminals were connected. Further, the lead terminals may be connected to each other using a thermosetting anisotropic conductive film instead of the ultraviolet curable resin.
[0003]
FIG. 3 shows a terminal connection structure of a liquid crystal display panel in which the lead terminals of the liquid crystal display panel and the lead terminals of the wiring board are connected using the above-described ultraviolet curable resin.
[0004]
3, a plurality of lead terminals 3, 3... Are formed on the electrode terminal portion 2 of the liquid crystal display panel 1. In FIG. On the other hand, a plurality of lead terminals 5, 5... Corresponding to the lead terminals 3 of the liquid crystal display panel 1 are formed on the wiring board 4 connected to the liquid crystal display panel 1.
[0005]
And in order to connect both these lead terminals 3 and 5, the terminal connection apparatus shown in FIG. 4 and FIG. 5 is used. This terminal connection device has a panel set table 6 on which the liquid crystal display panel 1 is placed, and stably holds the liquid crystal display panel 1. Further, a terminal table 7 on which the electrode terminal portion 2 on which the lead terminals 3 of the liquid crystal display panel 1 are arranged is arranged is provided at a position adjacent to the panel set table 6. The terminal table 7 is made of a transparent glass material or the like, and can transmit light such as ultraviolet rays. Further, a crimping head 8 is provided above the terminal table 7 so as to be movable up and down. Furthermore, an ultraviolet irradiator (not shown) for irradiating ultraviolet rays is disposed below the terminal table 7.
[0006]
In order to connect the lead terminal 3 of the liquid crystal display panel 1 and the lead terminal 5 of the wiring substrate 4, first, the liquid crystal display panel 1 is placed on the panel set table 6, and the liquid crystal display panel 1 The electrode terminal portion 2 in which the lead terminals 3 are arranged is placed on the terminal table 7. Next, an ultraviolet curable resin mixed with conductive particles is applied onto the lead terminal 3 of the electrode terminal portion 2, and the lead terminal 5 of the wiring board 4 is overlaid on the lead terminal 3. Then, by lowering the crimping head 8 from above the wiring substrate 4, the electrode terminal portion 2 of the liquid crystal display panel 1 and the wiring substrate 4 are crimped between the crimping head 8 and the terminal table 7. At this time, the ultraviolet curable resin is cured by irradiating ultraviolet rays from below the terminal table 7 with an ultraviolet irradiator, and the lead terminals 3 of the liquid crystal display panel 1 and the corresponding lead terminals 5 of the wiring board 4 are connected. can do.
[0007]
[Problems to be solved by the invention]
By the way, when the electrode terminal portion 2 and the wiring substrate 4 of the liquid crystal display panel 1 are pressed by the crimping head 8 as described above, the ultraviolet curable resin flows out between the liquid crystal display panel 1 and the wiring substrate 4, and is shown in FIG. Thus, the ultraviolet curable resin 9 may be cured in a state of protruding from the side of the wiring board 4 to the outside.
[0008]
On the other hand, the liquid crystal display panel 1 in recent years is required not only to increase the duty with the expansion of the display capacity, but also to save space in the outer shape. In particular, in order to save the space of the electrode terminal portion 2 of the liquid crystal display panel 1, not only the length of the lead terminal 3 is required to be reduced, but also the restrictions on the external dimensions when incorporated in a housing (not shown). It is getting stricter.
[0009]
In response to such a demand for space saving, when the ultraviolet curable resin 9 is cured in a state of protruding from the side of the wiring board 4 as described above, the outer dimensions are poor or the case is incorporated into the housing. In addition, the cured ultraviolet curable resin 9 may come into contact with the casing, and a load may act on the wiring board 4 to damage the wiring board 4.
[0010]
If the amount of the ultraviolet curable resin 9 is reduced in order to overcome such problems, not only the adhesive strength is insufficient, but there is a possibility that bubbles of the ultraviolet curable resin 9 may be generated at the connection portion.
[0011]
Such a problem is common even in the case where conductive particles are mixed in a thermosetting resin with high fluidity.
[0012]
The present invention overcomes such problems in the prior art and can be connected to a resin mixed with conductive particles so as to have sufficient adhesive strength, and this resin can be connected to the side edge of the wiring board. An object of the present invention is to provide a terminal connection structure for a liquid crystal display panel that does not protrude from the outside.
[0013]
[Means for Solving the Problems]
In order to achieve the above-described object, the terminal connection structure of the liquid crystal display panel according to the first aspect of the present invention is characterized in that the wiring board extends from a portion bonded to the electrode terminal portion of the liquid crystal display panel to a portion not bonded . The recesses are formed in the vicinity of the end portions on the electrode terminal portion side of both side edges. By adopting such a configuration, the resin protruding from between the electrode terminal portion of the liquid crystal display panel and the wiring substrate is located only in the concave portion of the wiring substrate, so that it can come into contact with the housing. Absent. For this reason, there is no possibility that the load is applied to the wiring board and the wiring board is damaged.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
1A and 1B each show an embodiment of a terminal connection structure of a liquid crystal display panel according to the present invention.
[0015]
That is, in both embodiments, the liquid crystal display panel 1 of the wiring board 4 connected to the electrode terminal 2, contact wear from the site 4A which is bonded by an ultraviolet curing resin to be described later to the liquid crystal display panel 1 of the electrode terminal 2 Concave portions 11 and 11 are formed in the vicinity of the ends on the electrode terminal portion 2 side of the side edges 10 and 10 that reach the portion 4B that is not performed. The recess 11 is formed by punching with a mold or a Thomson blade. Moreover, although this recessed part 11 is made into the rectangle in FIG. 1A and is made into the substantially U shape in FIG. 1B, it is not limited to these shapes.
[0016]
FIG. 2 shows the back surface of the wiring board 4. On the back surface of the wiring board 4, dummy terminals 12, 12... And short positioning marks 13 other than the regular lead terminals 5 are provided on both sides. Each is formed. Therefore, each of the recesses 11 is formed on the extension of the dummy terminals 12, 12... And the positioning mark 13. Accordingly, each recess 11 can be formed without adversely affecting the regular lead terminal 5.
[0017]
To describe an example of the dimensions of the recesses 11, the depth a = 0.3 mm, the dimension b = 0 in the direction of the part 4 </ b> A joined from the edge 14 of the electrode terminal part 2 of the liquid crystal display panel 1 to the electrode terminal part 2. .2 mm, the dimension c in the direction of the portion 4B not joined to the electrode terminal portion 2 from the edge 14 of the electrode terminal portion 2 is c = 0.3 mm.
[0018]
Next, the operation of the present embodiment having the above-described configuration will be described.
[0019]
In order to connect the wiring substrate 4 to the electrode terminal portion 2 of the liquid crystal display panel 1 using the ultraviolet curable resin 9, the ultraviolet curable resin in which conductive particles are mixed on the lead terminals (not shown) of the electrode terminal portion 2 is used. Is applied in such an amount that a sufficient adhesive strength can be obtained, and a lead terminal (not shown) of the wiring board 4 is overlaid on the lead terminal. Then, a crimping head (not shown) is lowered from above the wiring board 4 and the electrode terminal portion 2 of the liquid crystal display panel 1 and the wiring board 4 are crimped between the crimping head and a terminal table (not shown). . At this time, the ultraviolet curable resin is cured by irradiating ultraviolet rays from below the terminal table with an ultraviolet irradiator, and each lead terminal of the liquid crystal display panel 1 and each corresponding lead terminal of the wiring substrate 4 are connected. it can.
[0020]
At this time, even when the ultraviolet curable resin flows out between the liquid crystal display panel 1 and the wiring board 4 when the electrode terminal portion 2 of the liquid crystal display panel 1 and the wiring board 4 are pressed by the pressure-bonding head, FIG. As shown, even if the ultraviolet curable resin 9 is cured in a state of protruding from the side of the wiring board 4, the protruding of the ultraviolet curable resin 9 is performed only in each of the recesses 11, and the wiring It does not protrude beyond the side edge of the substrate 4.
[0021]
Therefore, when the liquid crystal display panel 1 is incorporated into the casing, the cured UV curable resin 9 does not protrude from the side edge of the wiring board 4, so there is no possibility that the UV curable resin 9 contacts the casing. For this reason, there is no possibility that the load is applied to the wiring board 4 and the wiring board 4 is damaged.
[0022]
On the other hand, since a sufficient amount of the ultraviolet curable resin 9 was applied, the adhesive strength between the electrode terminal portion 2 of the liquid crystal display panel 1 and the wiring substrate 4 was sufficient.
[0023]
【Example】
A flexible wiring board having a length of 2.5 mm and a lead terminal connected to the electrode terminal portion of the liquid crystal display panel by a length of 2.0 mm is used, and a = A recess having a depth of 0.3 mm and a width of b = 0.2 mm and c = 0.3 mm was punched, but a circuit was formed by dummy terminals and positioning marks formed on both sides. In particular, it is possible to prevent the connection reliability from being lowered.
[0024]
When such a flexible wiring board was used and the connection to the liquid crystal display panel was made with an ultraviolet curable resin, the ultraviolet curable resin protruded only in the recesses of the flexible wiring board. I was able to pay. Further, the adhesive strength between the liquid crystal display panel and the flexible wiring board at this time is 500 g or more at 90 ° peel, which is not different from the conventional flexible wiring board. Further, when the flexible wiring board was pulled obliquely, it was peeled off from the liquid crystal display panel at 200 g in the past, whereas in the present example, a strength of 1 kg or more was obtained and there was no problem.
[0025]
In addition, this invention is not limited to embodiment mentioned above, A various change is possible as needed.
[0026]
【The invention's effect】
As described above, according to the present invention, the resin mixed with the conductive particles can be connected so as to have sufficient adhesive strength, and the resin does not protrude from the side edge of the wiring board. Can be.
[0027]
That is, since the recesses are formed in the vicinity of the ends on the electrode terminal side of the both side edges of the wiring board from the part that is bonded to the electrode terminal part of the liquid crystal display panel to the part that is not bonded , the electrodes of the liquid crystal display panel Since the resin protruding from between the terminal part and the wiring board is located only in the concave part of the wiring board, it does not protrude from the side edge of the wiring board, and therefore contacts the case when it is incorporated into the case. There is no. As a result, since the load from the housing does not act on the wiring board, there is no possibility that the wiring board is damaged.
[Brief description of the drawings]
FIG. 1 is a plan view showing an embodiment of a terminal connection structure of a liquid crystal display panel according to the present invention. FIG. 2 is an enlarged back view of a wiring board in the embodiment of FIG. FIG. 4 is a schematic front view showing a terminal connection device of a general liquid crystal display panel. FIG. 5 is a schematic plan view of FIG.
DESCRIPTION OF SYMBOLS 1 Liquid crystal display panel 2 Electrode terminal part 3 Lead terminal 4 Wiring board 5 Lead terminal 9 UV curable resin 10 Side edge 11 of a wiring board Recess 12 Dummy terminal 13 Positioning mark

Claims (1)

In the terminal connection structure of the liquid crystal display panel in which a plurality of lead terminals formed on the electrode terminal portion of the liquid crystal display panel and the plurality of lead terminals of the wiring board are connected by a resin mixed with conductive particles,
Characterized in that the formation of the respective recess near the end of the electrode terminal portion of the opposite side edges of said wiring substrate reaching the site which is not bonded from the site to be bonded by the resin to the electrode terminal portions of the liquid crystal display panel Terminal connection structure for LCD panels.

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