JP4367222B2 - Flexible sheet fastening structure - Google Patents

Description

  The present invention relates to a fastening structure for a flexible sheet such as a flexible wiring board.

  Conventionally, a liquid crystal display panel is housed in a case, and a flexible printed circuit such as a tape carrier package (TCP) having a drive circuit element mounted on the liquid crystal display panel is connected to the liquid crystal display panel. There is a liquid crystal display module pulled out of the case for connection to an external control circuit board. (For example, see Patent Document 1)

  In the liquid crystal display module described above, a case is usually formed of a conductive material such as metal in order to prevent electromagnetic interference, an opening is provided in the case, and the flexible wiring board is drawn out of the case through the opening. Therefore, in the assembling work process or the like, the drawn-out flexible wiring board is often pulled or bent carelessly. In that case, the connection part where the flexible wiring board and each connection terminal part of the liquid crystal display panel are conductively bonded is peeled off to cause poor conduction, or the sharp edge of the case opening formed by cutting out the metal and the flexible wiring There is a possibility that the wiring pattern may be cut by contact with the board

In order to prevent the above-mentioned peeling or disconnection, the vicinity of the joint portion of the flexible wiring board with the liquid crystal display panel may be fixed to the case, but in the case of fixing using an adhesive or adhesive tape, Workability at the time of repair and disassembly is poor and man-hours are increased.
JP 11-258622 A

  An object of the present invention is to provide a fastening structure excellent in workability that allows a flexible sheet such as a flexible wiring board to be securely attached to a predetermined position and can be easily detached.

The fastening structure of the flexible sheet of the present invention is a structure for fastening the flexible sheet to a flat surface, and a hook formed by projecting a collar portion in one direction on a side surface of a support column erected on the flat surface. A locking hole which is formed in the flexible sheet and has a pair of tongue pieces extending from opposite edges of the hole , and each of the pair of tongue pieces has the flange portion as the support portion. It is characterized by extending in a direction parallel to the direction projecting from .

  According to the fastening structure of the flexible sheet of the present invention, the flexible sheet is securely fixed at a predetermined position only by locking the locking hole to the hook without using a secondary coupling member such as an adhesive or an adhesive. Therefore, the flexible sheet can be easily attached and detached with a small number of man-hours.

  The fastening structure of the flexible sheet of the present invention is suitable when the flexible wiring board that is conductively joined to the liquid crystal display panel is fastened to the bottom plate of the storage case.

Hereinafter, preferred embodiments of the present invention will be described.
FIG. 1 is an exploded perspective view showing a liquid crystal display module as one embodiment of the present invention, and FIG. 2 is a plan view showing an internal configuration thereof.

  In FIG. 1, a liquid crystal display panel 1 is formed by joining a pair of glass substrates 2 and 3 on which electrodes (not shown) are formed, with frame-like sealing materials (not shown) facing each electrode forming surface, A liquid crystal is sealed between glass substrates 2 and 3 surrounded by a frame-shaped sealing material. One glass substrate 2 of the pair of glass substrates 2 and 3 has an end portion extending outward from a corresponding end surface of the other glass substrate 3 to form an extension portion 2a. The liquid crystal display panel 1 is a narrow frame liquid crystal display panel in which the surrounding frame area Af is smaller than the display area Av.

  Each connection terminal (not shown) of the lead wiring 4 connected to each electrode of both the substrates 1 and 2 is arranged in parallel on the surface of the extension part 2a in the glass substrate 2 (extension surface of the electrode forming surface). ing. The liquid crystal display panel 1 of this example is a one-side substrate terminal type liquid crystal display element in which connection terminals corresponding to electrodes provided on both substrates 2 and 3 are arranged in parallel on the extending portion 2 a of one glass substrate 2. is there.

  The flexible wiring board 5 is joined to the extending portion 2a where the connection terminal row is formed. The flexible wiring board 5 is a TAB (Tape Automated Bonding) type wiring board on which a drive circuit element 6 for driving the liquid crystal display panel 1 is directly mounted. That is, a surface (hereinafter referred to as a wiring surface) 5 a on which the wiring pattern of the flexible wiring substrate 5 is formed is conductively bonded to the surface of the extended portion 2 a of the glass substrate 2, and an opening formed in the flexible wiring substrate 5 ( The drive circuit element 6 is conductively installed on the wiring pattern on the wiring surface 5a side from the surface (hereinafter referred to as the non-wiring surface) 5b side on which the wiring pattern on the opposite side is not formed. Therefore, the back surface of the drive circuit element 6 is exposed on the side opposite to the wiring surface 5 b of the flexible wiring substrate 5.

  At the end of the wiring surface 5a of the flexible wiring substrate 5 bonded to the extending portion 2a of the glass substrate 2, a connection terminal row 7a of the output wiring 7 drawn from the drive circuit element 6 is provided as shown in FIG. Is formed. These connection terminal rows 7a are conductively connected to connection terminal rows (not shown) of the routing wirings 4 arranged on the surface of the extending portion 2a of the substrate 1 through, for example, an anisotropic conductive adhesive (not shown). ing.

  A tongue 5c projects from the end of the flexible wiring board 5 opposite to the output wiring side end. An input wiring 8 connected to the drive circuit element 6 is routed around the tongue 5c, and a connection terminal 8a is formed at the end of each input wiring 8.

  The flexible wiring board 5 is provided with a locking hole 9 for fixing it. In the present embodiment, a total of four locking holes 9 are selectively drilled in each area where the input and output wirings 7 and 8 are not provided at both ends in the longitudinal direction of the flexible wiring board 5. It is installed. As shown in FIG. 3 (a) in which the Q portion of FIG. 2 is enlarged, each of the locking holes 9 has a pair of tongue pieces 9a, 9b is formed.

  Returning to FIG. 1, the liquid crystal display panel 1 to which the flexible wiring board 5 is bonded as described above is inserted into a resin storage case 10 whose planar outer shape is rectangular. On the bottom surface 10a of the storage case 10, a step 10d is formed extending in parallel with one of the opposing side walls 10b and 10c, and the bottom surface 10a is divided into two. The depth of the step 10b is set to be approximately the same as the thickness of the glass substrate 2 of the liquid crystal display panel 1. Accordingly, the storage case 10 is divided into a liquid crystal display panel storage chamber 10e into which the lower liquid crystal display panel 1 is inserted, and an upper wiring substrate storage chamber 10f, with the step 10d as a boundary. A notch 10g is formed in the side wall 10c of the wiring board storage chamber 10f. The notch 10g becomes a part of an opening for pulling out the tongue 5c of the flexible wiring board 5 to the outside of the storage case 10.

  Then, four hooks 11 are erected on the bottom surface 10a1 of the wiring board storage chamber 10f so as to correspond to the locking holes 9 of the flexible wiring board 5 described above. As shown in FIGS. 3 and 4, the hooks 11 are respectively fitted with corresponding locking holes 9 formed in the flexible wiring board 5, so that the flexible wiring board 5 is attached to the bottom surface 10a1 of the storage case. It is fixed to. In this case, since the pair of tongue pieces 9a and 9b are provided in the locking hole 9, the displacement along the bottom surface 10a1 of the flexible wiring board 5 is suppressed to the minimum.

  Each hook 11 has a shape in which the flange portion 11a is protruded from the side surface of the distal end portion of the column portion 11b that forms a substantially quadrangular prism. And the side surface 11c on the opposite side to the side surface where the collar part 11a of the support | pillar part 11b was protrudingly formed is formed in the inclined surface moderately inclined toward the collar part 11a side toward the front-end | tip.

Here, the maximum thickness D along the direction in which the flange portion 11a of the support column 11b protrudes in the hook 11 and the protrusion length L of the flange portion 11a are determined by each of the tongue pieces 9a and 9b of the locking hole 9 described above. When the extension length is A, B, and the distance between their respective tips is C,
D ≦ C (1)
and,
A + C <D + L <A + B + C (2)
Is set to

  In the present embodiment, the height H of the flange portion 11a is set to be substantially the same as the thickness T of the flexible wiring board 5. As a result, since no wiring is formed in the portion of the flexible wiring board 5 that is locked by the flange portion 11a, the gap s corresponding to the thickness of the wiring is secured. The piece 9a is smoothly inserted and sufficiently pressed and held.

  As shown in FIG. 1, a shielding case 12 made of a conductive material is mounted on a storage case 10 in which a liquid crystal display panel 1 to which a flexible wiring board 5 is bonded is inserted. The shield case 12 of the present embodiment is formed by processing a metal plate into a sheet metal, and a display window 12a is formed in the main surface of the case so as to correspond to the display area Av of the liquid crystal display panel 1. The area of the display window 12a is set to be slightly smaller than the display area Av of the liquid crystal display panel 1 as a whole.

  The shield case 12 has four side walls around it, and a notch 12c corresponding to the notch 10g of the storage case 10 is formed on the side wall 12b corresponding to the side wall 10c of the storage case 10. ing. The cutout portion 12c forms an opening with the cutout portion 10g of the storage case 10 in a state where the storage case 10 is covered with the shield case 12, and the tongue portion 5c of the flexible wiring board 5 described above is formed through the opening. It is pulled out.

Next, each work procedure of case storage and disassembly of the liquid crystal display module of this embodiment will be described.
When the liquid crystal display panel 1 to which the flexible wiring board 5 is bonded is inserted into the storage case 10, first, as shown in FIG. 1, the four locking holes 9 of the flexible wiring board 5 are first inserted into the storage case 10. Are respectively extrapolated to the corresponding hooks 11. At this time, the support column maximum thickness D and hook protrusion length L of each hook 11 are relative to the tongue piece extension lengths A and B and the tip-to-tip distance C of each locking hole 9.
D + L <A + B + C
Therefore, the tongue pieces 9a and 9b of the respective locking holes 9 are flexibly bent by simply pressing the flexible wiring board 5 against the bottom surface 10a1 after aligning the positions of the locking holes 9 with respect to the hooks 11. Each locking hole 9 can be easily extrapolated to the corresponding hook 11.

  After the extrapolation of the locking hole 9 to the hook 11 is finished, the liquid crystal display panel 1 is fitted into the panel storage chamber 10e of the storage case 10. In this fitting operation, the storage position of the liquid crystal display panel 1 is determined by fitting the glass substrate 2 into the lower step portion of the step 10 b formed on the bottom surface 10 a of the storage case 11. When the liquid crystal display panel 1 is fitted in the panel storage chamber 10e of the storage case 10, the arrangement of the hooks 11 corresponding to the locking holes 9 of the flexible wiring board 5 is as shown in FIG. The arrangement is as shown in 4 (a).

  That is, the area where the hook portion 11a of the hook 11 covers the flexible wiring board 5 extends not only to the corresponding tongue piece 9a but also to the main body portion (the part other than the tongue piece 9a) of the flexible wiring board 5 which is the root. . Therefore, in this state, even if an inadvertent external force is applied to the flexible wiring board 5 in the direction away from the case bottom surface 10a1, the main body portion of the flexible wiring board 5 which is difficult to bend is locked to the tip of the flange portion 11a. It is difficult to remove the locking hole 9 from the hook 11.

  When the liquid crystal display panel 1 has been fitted, the shield case 12 is mounted on the storage case 10. Thereby, the case storing operation of the liquid crystal display panel 1 and the flexible wiring board 5 is completed.

  In order to disassemble the liquid crystal display module in which the liquid crystal display panel 1 is housed in the case and take out the liquid crystal display panel 1 to which the flexible wiring board 5 is bonded for repair or the like, first, the shield case 12 is placed in the housing case 10. Remove from.

  Next, the liquid crystal display panel 1 is detached from the panel storage chamber 10e. Thereafter, the flexible wiring substrate 5 is moved together with the liquid crystal display panel 1 in the protruding direction of the hook portion 11 a of the hook 11. In this case, as shown in FIGS. 3 (b) and 4 (b), the tongue piece 9b is bent and moved so that the hook portion 11a of the hook 11 is positioned above the tongue piece 9a. At this time, since the tip of the tongue piece 9b is smoothly slid and bent by the slope effect on the inclined side surface 11c of the hook column 11b, the flexible wiring board 5 can be easily moved.

  In the above-described arrangement, when the flexible wiring board 5 is separated from the case bottom surface 10a1, the front end of the flange portion 11a does not engage with the main body portion of the flexible wiring board 5, so that the locking hole 9 can be easily removed from the hook 11. be able to. Thereby, the liquid crystal display panel 1 is detached from the storage case 10 together with the flexible wiring substrate 5 bonded thereto.

  As described above, in the liquid crystal display module of the present embodiment, the locking hole 9 including the pair of tongue pieces 9 a and 9 b is formed in the flexible wiring board 5, and this is erected on the bottom surface 10 a 1 of the storage case 10. Since the flexible wiring board 5 is structurally fixed to the storage case bottom surface 10a1 without using a bonding member such as an adhesive by extrapolating the hook 11 having the portion 11a, the liquid crystal to which the flexible wiring board 5 is bonded Both the operations of storing and removing the display panel 1 from the case are extremely easy, and the man-hours for both the operations are greatly reduced.

  In this case, by setting the outer dimensions of the tongue pieces 9a and 9b of the locking hole 9 and the hook 11 so as to satisfy the above expressions (1) to (2), the flexible wiring board 5 The movement in the direction along the case bottom surface 10a1 is suppressed to a minimum by the pair of tongues 9a and 9b, and the movement in the direction away from the case bottom surface 10a1 (in the peeling direction) is suppressed by the hook 11a of the hook 11. It is surely fixed. As a result, even if the flexible wiring board 5 is carelessly pulled or bent, the joint portion of the connection terminal row 7a (see FIG. 2) will not be peeled off, and the occurrence of poor conductive joint between the connection terminals will be more reliably generated. To be prevented.

  Further, the tongue portion 5c of the flexible wiring board 5 drawn out of the case is bent and comes into contact with the opening edge of the shield case 12 and is easily damaged, but the vicinity is fixed by the pair of hooks 11, Damage due to the opening edge is remarkably suppressed.

In addition, this invention is not limited to said embodiment.
For example, the fastening structure of the present invention is not limited to the case where the flexible wiring board is fastened to the bottom surface of the case, but of course can be widely applied to the case where other various flexible sheets are fastened to the flat surface.

It is a perspective view which decomposes | disassembles and shows the liquid crystal display module as one Embodiment of this invention. It is a top view which shows the internal structure of the said liquid crystal display module except a shield case. It is a top view which expands and shows the Q section of FIG. 2, (a) shows the completion state of attachment, (b) has shown the state before removal. FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Liquid crystal display panel 2, 3 Glass board | substrate 4 Connection terminal part 5 Flexible wiring board 6 Drive circuit element 7 Output wiring 8 Input wiring 9 Locking hole 9a, 9b Tongue piece 10 Storage case 11 Hook 11a Eave part 11b Prop part 12 Shield case

Claims (5)

A structure in which a flexible sheet is fixed to a flat surface,
A hook formed by projecting a collar portion in one direction on a side surface of the column portion erected on the flat surface;
The drilled in the flexible sheet, and a locking hole in which a pair of tongue pieces are formed extending on opposing edges of the hole,
Each of the pair of tongue pieces extends in a direction parallel to a direction in which the flange portion protrudes from the support column portion . The fixing of the flexible sheet according to claim 1, wherein a side surface of the column portion corresponding to a back surface side of the side surface from which the flange portion protrudes is inclined at a predetermined angle with respect to the flat surface. Construction. In the flexible sheet, a plurality of connection terminals that are conductively connected to the display panel are arranged in a row,
The fastening structure for a flexible sheet according to claim 1, wherein the flange portion protrudes from the support portion in a direction in which the connection terminals are arranged. The protrusion length of the hook part in the hook is L, the maximum thickness along the direction in which the hook part of the support part protrudes is D, the extension lengths of the pair of tongue pieces are A, B, and When the distance between the tips of each tongue is C,
D ≦ C,
and,
A + C <L + D <A + B + C
The fastening structure for a flexible sheet according to claim 1, wherein the fastening structure is a flexible sheet. 3. The flexible sheet according to claim 1, wherein the flexible sheet is a flexible wiring board that is conductively bonded to a liquid crystal display panel, and the flat surface is a bottom surface of a case that houses the liquid crystal display panel. Fastening structure.

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