JP2003280024A - Liquid crystal display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display device which is improved in yield by preventing an FPC from being disconnected, tightly holds a liquid crystal panel, and is made thin in thickness. <P>SOLUTION: A frame 22 has a liquid crystal display panel support part 22a which supports an end 24f, where a connection part 24e of the liquid crystal display panel 24 is provided, from below. A support plate 32 presses the end 24f of the liquid crystal display panel 24 from above and is fitted with a fitting part 22d of the frame 22. The connection part between the liquid crystal display panel 24 and FPC 10 is sandwiched between the liquid crystal display panel display part 22a and support plate 32 and protected. The liquid crystal display panel 24 is sandwiched between the frame 22 and support plate 32 and fixed. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid crystal display device, and more particularly to a flexible wiring board (hereinafter referred to as "F
And a structure for holding the liquid crystal display panel.

[0002]

2. Description of the Related Art The structure of a conventional liquid crystal display device of this type, for example, a device having a backlight has a structure shown in FIGS. 7, 8 and 9. That is, in the conventional liquid crystal display device, the frame body 2, the liquid crystal display panel 4 arranged above the frame body 2, the light guide plate 6 arranged below the liquid crystal display panel 4 and below the frame body 2, A diffusion plate 8 arranged between the display panel 4 and the light guide plate 6, an FPC 10 connected to the liquid crystal display panel 4, and the FPC 10
And a light emitting element 12 such as an LED mounted on the.

The liquid crystal display panel 4 having the above structure is provided on an upper glass 4a and a lower glass 4b with a liquid crystal sealed therebetween, an upper polarizing plate 4c provided on the upper surface of the upper glass 4a and a lower surface of the lower glass 4b. And a lower polarizing plate 4d. As shown in FIG. 8, the liquid crystal display panel 4 is provided with a connecting portion 4e at the end portion of the upper glass 4a (or the lower glass 4b in some cases). On the other hand, FP
C10 is a base film 10f in which a conductive pattern 10d is formed on the surface and a connecting portion 10c is provided at an end portion.
In order to protect the conductive pattern 10d, as shown in FIG. 9, there is a cover lay 10e provided in the area A excluding the connecting portion 10c. The FPC 10 has a connecting portion 10c provided at the end thereof on the upper glass 4 of the liquid crystal display panel 4.
The liquid crystal display panel 4 is formed by pressing the connection portion 4e of a.
Is electrically connected to and attached to.

As shown in FIG. 9, the light emitting element 12 is an FPC.
The light emitting element 12 is mounted on a protruding portion 10b branched from the main body 10a of 10 and the light emitting element 12 is positioned on the inner surface of the bottom portion of the frame body 2 by pulling the protruding portion 10b from an optimal position such as a side of the light guide plate 6. The light guide plate 6 can be irradiated with light. When the light emitting element 12 is routed as described above, not only the protruding portion 10b of the FPC 10 but also the
It may be necessary to bend the main body 10a and draw it from the side of the frame 2 downward.

Further, as described above, the frame body 2 having an upper opening
In the structure in which the liquid crystal display panel 4 is housed in the upper part of the above, as shown in FIGS. 10 to 12, elastic hook parts 2a to 2d are provided in the upper part of the frame body 2. This hook part 2
a to 2d hold the liquid crystal display panel 4 by hooking the outside of the parting line on the upper surface of the liquid crystal display panel 4.

Of the hook portions 2a to 2d of the frame body 2, the hook portions 2a and 2b are hooked on the edge of the upper glass 4a of the liquid crystal display panel 4, and the hook portions 2c and 2d are the upper polarizing plates of the liquid crystal display panel 4. The liquid crystal display panel 4 is provided by being hooked on the edge of 4c.
Was supposed to hold.

[0007]

The base film 10f on the outside of the connecting portion 10c of the FPC 10 is
Although covered with the cover lay 10e, the cover lay opening 10g that is not covered with the cover lay 10e is generated due to variations in dimensions in forming each component, and the base film 1
0f may be exposed. The cover lay opening 10g has low strength and is easily bent. When the FPC 10 is bent as described above, the bent portion is the portion formed only by the base film 10f, that is, the coverlay opening 10g. When the base film 10f located in the coverlay opening 10g is bent, compression and expansion and contraction at that time cause
The conductive pattern 10d on the base film 10f may be cracked and broken. If such disconnection occurs, the yield will decrease, and the cost will increase due to the correction and replacement, etc., and the improvement of the yield has been a problem.

Further, in the above-mentioned conventional liquid crystal display device, the upper polarizing plate 4c of the liquid crystal display panel 4 is set so as to enter the inner side of the upper glass 4a by a processing variation. For this reason, the hook portions 2c and 2d are supposed to be hooked on the upper surface of the upper polarizing plate 4c only at a small portion which is the tip thereof. In this way, the hook part 2
Since the hooking areas of c and 2d are very small, the hooking strength is weak and the hooks 2c and 2d are not subject to vibration or impact.
Was sometimes separated from the upper polarizing plate 4c. The hook portions 2c and 2d which are detached from the upper polarizing plate 4c are covered on the upper glass 4a outside the upper polarizing plate 4c, but the heights of the hook portions 2c and 2d are taken into consideration in consideration of the thickness of the upper polarizing plate 4c. However, since a gap is created between the hook portions 2c and 2d and the upper glass 4a, loosening may occur and it may not be possible to firmly hold them. Further, in this structure, the thickness of the tip portions of the hook portions 2c and 2d increases the thickness of the liquid crystal display device as a whole, which is a constraint for thinning.

The present invention has been made in view of the above-mentioned problems of the prior art. By protecting the connecting portion between the liquid crystal display panel and the FPC, the disconnection of the FPC is prevented, the yield is improved, and the liquid crystal display panel is solid. The present invention provides a liquid crystal display device that holds the liquid crystal display and is thin.

[0010]

According to another aspect of the present invention, there is provided a liquid crystal display device in which a liquid crystal display panel is arranged in a frame and a flexible wiring board is connected to the liquid crystal display panel. In the liquid crystal display panel, a liquid crystal display panel support portion that supports from below a portion provided with a connection portion to which the flexible wiring board is connected is provided in the frame body, and the liquid crystal display panel is supported by fitting the liquid crystal display panel support portion in the frame body. A support plate is provided to support the portion of the display panel where the connecting portion is provided from above. In the liquid crystal display device, the frame body is provided with a groove-shaped fitting portion into which the support plate is fitted. Further, as described in claim 3, the groove-shaped fitting portion in this liquid crystal display device has an opening in a side surface or an upper surface direction, and the support plate is fitted through the opening. There is. Further, as described in claim 4, the flexible wiring board in this liquid crystal display device has a base film and a cover lay covering the surface thereof, and is provided at an end portion of the base film protruding from the cover lay. The connection part is connected to the connection part of the liquid crystal display panel, and the support plate is located outside the cover lay opening part where the base film exposed between the liquid crystal display panel and the cover lay is exposed. It is intended to suppress the portion where the ray and the base film are polymerized. Furthermore, the connecting portion of the liquid crystal display panel in this liquid crystal display device is formed on the upper surface of the lower glass as described in claim 5.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION In the liquid crystal display device of the present invention, a liquid crystal display panel supporting portion for supporting a portion of the liquid crystal display panel where a connecting portion for connecting an FPC is provided from below is provided in a frame. . In addition, a support plate that presses the portion provided with the connection portion of the liquid crystal display panel from above is fitted to the frame body. With such a configuration, in the liquid crystal display panel, the portion provided with the connection portion is sandwiched between the frame body and the support plate. Therefore, the connecting portion between the liquid crystal display panel and the FPC is sandwiched and protected by the liquid crystal display panel support portion and the support plate of the frame body. Further, the liquid crystal display panel is fixed by being sandwiched between the frame body and the support plate, and the liquid crystal display panel can be firmly fixed without protruding upward like a hook portion.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a sectional view showing a liquid crystal display device according to an embodiment of the present invention, and FIG. 2 is an exploded perspective view of the liquid crystal display device shown in FIG. In this embodiment, the light guide plate 6, the diffusion plate 8 and the FP
Regarding the C10 and the light emitting element 12, those having the same configurations as those shown in FIGS. 7 to 9 are used. That is,
The light guide plate 6 is arranged below a liquid crystal display panel 24 described later, and a diffusion plate 8 is arranged between the light guide plate 6 and the liquid crystal display panel 24. In addition, the FPC 10
It has a base film 10f having a conductive pattern 10d formed on its surface, and a cover lay 10e covering the surface of the base film 10f except for the connecting portions 10c provided at its ends. Further, the light emitting element 12 is mounted on the protruding portion 10b branched from the main body 10a of the FPC 10.

On the other hand, the liquid crystal display panel 2 according to the present embodiment.
4 is an upper glass 24a and a lower glass 2 with a liquid crystal sealed between them.
4b and the upper polarizing plate 2 provided on the upper surface of the upper glass 24a.
4c and the lower polarizing plate 2 provided on the lower surface of the lower glass 24b.
4d. In addition, the end portion 2 of the lower glass 24b
4f is projected to one side from the upper glass 24a, and the connecting portion 2 for connecting the FPC 10 is provided on the upper surface of the end portion 24f.
4e is provided.

The frame 22 is open at the top, and the light guide plate 6 and the diffusion plate 8 are contained in the lower part, and the liquid crystal display panel 24 is contained in the upper part. The frame 22 is provided with a liquid crystal display panel support portion 22a that receives and supports the end portion 24f of the lower glass 24b of the liquid crystal display panel 24 from below.
The liquid crystal display panel support portion 22a is used for the liquid crystal display panel 2
The frame 22 provided so as to correspond to the connection portion 24e of No. 4
It is formed on the upper surface of the inner step portion 22b. This step 22
b extends as it is to the outside of the frame body 22, and the frame body 22 has a side surface opening portion 22c which is opened in the side surface direction at the position of the step portion 22b.

Further, the frame body 22 has a fitting portion 22d on its upper portion. The fitting portion 22d is a groove formed in the upper portion of the side walls 22e and 22f sandwiching the liquid crystal display panel support portion 22a and opening in the same side surface direction as the side surface opening portion 22c.

The support plate 32 includes side walls 22e, 2 of the frame 22.
A plate-shaped main body 32a slightly longer than the outer dimension between 2f,
It has an engaging portion 32b bent downward from both ends thereof. The support plate 32 is attached to the frame body 22 by fitting the main body 32a into the groove-shaped fitting portion 22d and engaging the engaging portion 32b with the outer surface of the side wall 22e of the frame body 22.

In the above structure, when the liquid crystal display panel 24 is housed in the frame 22, the end 24f of the lower glass 24b is placed on the liquid crystal display panel support 22a of the frame 22. A connection portion 24e is provided on the upper surface of the end portion 24f, and the connection portion 10c of the FPC 10 is welded. When the support plate 32 is fitted into the fitting portion 22d, the main body 32a of the support plate 32 presses the connecting portions 10c and 24e of the FPC 10 and the lower glass 24b from above. As a result, the end portion 24f of the lower glass 24b is sandwiched between the liquid crystal display panel support portion 22a and the support plate 32, and as a result, the liquid crystal display panel 24 is fixed.

The width of the support plate 32 is the same as that of the connecting portion 10 described above.
It is set so as to press down from c and 24e to a portion where the cover lay 10e positioned outside the cover lay opening 10g of the FPC 10 and the base film 10f are superposed. Therefore, when the FPC 10 is bent upward in the drawing, a portion where the cover lay 10e and the base film 10f are overlapped with each other by hitting the support plate 32 is bent upward, and when the FPC 10 is bent downward in the drawing, the liquid crystal display panel support of the frame 22 is supported. Part 2
2a hits coverlay 10e and base film 10
The part where f and superpose is bent downward. Therefore,
The cover lay opening 10g is not bent.

As shown in FIG. 3, by setting the engaging portion 32b of the support plate 32 to be bent inward,
The force with which the side walls 22e and 22f of the frame body 22 are engaged can be increased. By firmly engaging the support plate 32 with the frame body 22 in this manner, the vertical dimension of the fitting part 22d is widened so that the support plate 32 can be easily inserted into the fitting part 22d. Even if it is set so that there is a gap between them, the lower glass 24b can be firmly fixed.

Regarding the fitting portion 22d of the frame body 22,
As shown in FIG. 4, the fitting portion 22d may be formed by setting the groove so as to be integrated with the upper portion in the side surface opening 22c and providing the inward projecting portion 22g on the upper ends of the side walls 22e and 22f. it can. In this case, the support plate 32 has its main body 32.
It is sufficient if it is a plate material of only a part. In order to fit the support plate 32 into the fitting portion 22d, the elasticity of the inward protruding portion 22g is used to bend and spread it upward, and after the support plate 32 is fitted, the inward protruding portion 22g is used as the basis. Insert it by returning it.

Further, as shown in FIG. 5, it is possible to form a fitting portion 22d by providing a groove having a partially open upper portion on the upper portions of the side walls 22e and 22f of the frame body 22. Also in this case, the support plate 32 is a plate-shaped one, and the inward projection 22
By elastically bending g, the support plate 32 is fitted into the fitting portion 22d.

Further, as shown in FIG. 6, the F of the support plate 32 is
The portion that abuts the PC 10 and the liquid crystal display panel support portion 22a
By providing the sheet-like elastic members 26 and 28 at the portions which come into contact with the lower surface of the lower glass 24b, the respective portions can be brought into close contact with each other and more securely fixed.

The coverlay opening 10 of the FPC 10 is also used.
The cover lay opening 10g may be covered by applying a molding material such as silicon resin or UV resin to g. In this case, since the thickness of the entire device is not affected, it is preferable that the height of the molding material be kept within the thickness of the lower glass 24b.

In the above structure, the lower glass 24b
Although the FPC 10 is connected to the above, the same applies to the case where the connection portion is formed on the lower surface of the end portion of the upper glass 24a to be connected. In this case, if the end portion of the upper glass 24a is pressed from above by the support plate 32, there is no great difference in the thinning from the conventional one in which the hook portion is fixed, but the fixing force is fixed in a wide area. Therefore, it can be fixed much more strongly than the conventional one.

[0025]

According to the present invention, even when the FPC is bent, the FPC hits the vicinity of the side opening of the support plate and the frame body and the coverlay opening of low strength bends as a fulcrum. Since it is prevented, the conductive pattern in the vicinity of the cover lay opening is not broken, and the yield can be improved.

Further, by improving the yield as described above, it is possible to significantly reduce the work and cost related to the correction, disposal or inspection of the defective product, and as a result, the manufacturing cost is reduced. be able to.

Further, the lower glass or the upper glass of the liquid crystal display panel can be fixed by sandwiching it between the surfaces of a large area by the liquid crystal display panel supporting portion and the supporting plate of the frame. The fixing force of is weakened so that it does not move up or down or tilt. In particular, when the lower glass is fixed by the supporting plate, the supporting plate can be contained within the thickness of the upper glass, and the liquid crystal display device can be thinned.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing a liquid crystal display device according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the liquid crystal display device shown in FIG.

FIG. 3 is a partially enlarged view showing an engaging portion of the support plate shown in FIG.

FIG. 4 is a side view showing a modified example of the fitting portion and the support plate shown in FIG.

5 is a side view showing another modification of the fitting portion and the support plate shown in FIG.

FIG. 6 is an enlarged cross-sectional view of a main part showing a state in which an elastic member is interposed in the liquid crystal display device shown in FIG.

FIG. 7 is a cross-sectional view showing a conventional liquid crystal display device.

8 is an enlarged cross-sectional view of a main part of the liquid crystal display device shown in FIG.

9 is a plan view of the FPC shown in FIGS. 1 to 8. FIG.

FIG. 10 is a cross-sectional view showing a conventional liquid crystal display device.

11 is a plan view of the liquid crystal display device shown in FIG.

12 is a perspective view of the liquid crystal display device shown in FIG.

[Explanation of symbols]

2,22 frame 4,24 LCD display panel 4a, 24a Upper glass 4b, 24b Lower glass 4e, 24e connection part 6 Light guide plate 8 diffuser 10 Flexible wiring board 10c connection part 10d conductive pattern 10e coverlay 10f base film 10g coverlay opening 12 Light emitting element 22a Liquid crystal display panel support portion 22b step 22c Side opening 22d fitting part 22e, 22f Side wall 22g inward protrusion 24e connection part 24f end 26,28 elastic member

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁷ Identification code FI theme code (reference) H05K 1/14 H05K 1/14 C (72) Inventor Akio Yoshimura 2 of 6663 Funatsu, Kawaguchiko-cho, Minamitsuru-gun, Yamanashi Prefecture Kawaguchiko Precision Co., Ltd. F term (reference) 2H089 HA40 JA10 TA03 TA07 2H092 GA50 GA53 GA54 NA15 NA17 5C094 AA32 AA42 BA43 DB02 HA08 5E344 AA02 AA15 AA22 BB02 BB10 EE17 5G435 AA16 AA17 BB12 EE05 EE43 EE06 EE06 EE06 EE13 EE06 EE13 EE06 EE13 EE06 EE13

Claims (5)

[Claims] 1. A liquid crystal display device in which a liquid crystal display panel is arranged in a frame and a flexible wiring board is connected to the liquid crystal display panel, wherein a connection portion to which the flexible wiring board in the liquid crystal display panel is connected is provided. The frame body is provided with a liquid crystal display panel support portion that supports the above portion from below, and a support plate that supports the portion where the connection portion of the liquid crystal display panel is provided from above by being fitted to the frame body is provided. A liquid crystal display device characterized by the above. 2. The liquid crystal display device according to claim 1, wherein the frame body is provided with a groove-shaped fitting portion into which the support plate is fitted. 3. The liquid crystal display device according to claim 2, wherein the groove-shaped fitting portion has an opening in a side surface or an upper surface direction, and the support plate is fitted through the opening. 4. The flexible wiring board has a base film and a cover lay covering the surface of the base film, and a connecting portion provided at an end of the base film protruding from the cover lay is a connecting portion of the liquid crystal display panel. The support plate is connected to a portion where the cover lay and the base film located outside the cover lay opening where the base film exposed between the liquid crystal display panel and the cover lay overlaps. The liquid crystal display device according to claim 1, wherein the liquid crystal display device is held down. 5. The connection part of the liquid crystal display panel is formed on an upper surface of a lower glass.
5. The liquid crystal display device according to any one of items 1 to 4.