JP2004117659A - Liquid crystal display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid crystal display capable of easily and reliably preventing careless damage of a flexible wiring board connected to a liquid crystal panel. <P>SOLUTION: The liquid crystal display is provided with a sheet metal case 1 formed by press processing and having a bottom wall 1a and a side wall 1b, a resin frame 2 disposed along an inner surface of the side wall 1b of the sheet metal case 1, the liquid crystal panel 3 whose edge part is supported by the resin frame 2, a printed circuit board 4 disposed on the outer surface of the bottom wall 1a of the sheet metal case 1, and the flexible wiring board 5 curved on the outside of the side wall 1b of the sheet metal case 1 while protruding to lateral sides of respective end parts of the liquid crystal panel 3 and the printed circuit board 4 and a protruding part 2b protruding to the lateral side from the outer surface of the side wall 1b of the sheet metal case 1 is formed at the resin frame 2. Thereby, the inner surface 5a of the flexible wiring board 5 comes in near contact or contact with the protruding part 2b of the resin frame 2 while not coming in contact with the tip part of the side wall 1b of the sheet metal case 1 at all. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a liquid crystal display device, and more particularly, to a liquid crystal display device that prevents a flexible wiring board connected to a liquid crystal panel from being inadvertently damaged.
[0002]
[Prior art]
As shown in FIG. 5, for example, a conventional liquid crystal display device includes a sheet metal case 1 having a bottom wall 1a and a side wall 1b bent from an edge of the bottom wall 1a, and a side wall 1b of the sheet metal case 1. A resin frame 2 arranged along the inner surface, a liquid crystal panel 3 whose edge is supported by the resin frame 2, and an outer surface of the bottom wall 1 a of the sheet metal case 1 opposed to the liquid crystal panel 3. A printed circuit board, and a flexible wiring board that interconnects the liquid crystal panel and the printed circuit board, and that protrudes laterally from ends of each other and curves outside the side wall of the sheet metal case. I have.
[0003]
Here, the sheet metal case 1 is formed by pressing a flat metal plate such as aluminum or stainless steel. The contour, that is, the tip of the side wall 1b is formed through a punching process, and then the bottom wall 1a and the side wall are formed through a bending process. 1b is formed. The resin frame 2 is molded from a resin such as polycarbonate or acrylic.
[0004]
The liquid crystal panel 3 has liquid crystal sealed between a pair of glass substrates. One end of a wiring on the flexible wiring substrate 5 is connected to an electrode terminal formed on one of the glass substrates. The printed circuit board 4 drives the display of the liquid crystal panel 3, and the other end of the wiring on the flexible wiring board 5 is connected to an electrode terminal formed on one surface thereof. The flexible wiring board 5 is a thin tape having a flexibility, and has an inner surface 5a on which wires connected to the respective electrode terminals of the liquid crystal panel 3 and the printed circuit board 4 are formed. I have.
[0005]
Reference numeral 6 denotes a lighting device serving as a light source for a liquid crystal display as a backlight. The lighting device 6 is disposed on the inner surface of the bottom wall 1 a of the sheet metal case 1 so as to face the liquid crystal panel 3 and is held by the resin frame 2.
[0006]
By the way, since the sheet metal case 1 goes through the punching step in the press working as described above, burrs 1c of about 30 to 50 μm (excess projections projecting in the direction of the punching) are generated at the corners of the tip of the side wall 1b, The burrs 1c may eventually remain laterally after the bending process. In this case, although the flexible wiring board 5 in the liquid crystal display device is provided with the outside of the side wall 1b of the sheet metal case 1 provided in a curved shape, there is a sufficient margin for the installation space mainly from the viewpoint of reducing the size of the liquid crystal display device. In particular, the burrs 1c remaining at the corners of the outer surface of the side wall 1c of the sheet metal case 1 and the inner surface 5a of the flexible wiring board 5 are brought into close or contact with each other.
[0007]
Then, when such a liquid crystal display device is mounted on a small electronic device such as a portable information terminal or a mobile phone, the external surface of the flexible wiring board 5 is frequently subjected to external vibrations and shocks when carrying the device. 5a rubs against the burr 1c of the side wall 1c of the sheet metal case 1 and is inadvertently damaged, and the wiring on the inner surface 5a is broken.
[0008]
Therefore, at present, as a remedy to prevent such a problem, the burr 1c is removed, the corner of the outer surface of the side wall 1c of the sheet metal case 1 is chamfered, or the side wall 1c of the sheet metal case 1 is The side wall 1c is provided with a through hole extending through the flexible wiring board 5 through the side wall 1c, and a tapered portion is formed at a portion of the periphery of the through hole that comes into contact with the inner surface 5a of the flexible wiring board 5 (for example, (See Patent Document 1). According to such an improvement, the inner surfaces 5a of the flexible wiring board 5 do not excessively rub against each other, so that careless damage including disconnection of the flexible wiring board 5 can be temporarily prevented.
[0009]
[Patent Document 1]
JP-A-11-150385 (page 3, FIG. 1)
[0010]
[Problems to be solved by the invention]
However, in any of the above-mentioned improvement measures, in forming the sheet metal case 1, in addition to press working, additional processing such as removal of burrs 1c, chamfering, and forming of a tapered portion is indispensable. The production efficiency of the sheet metal case 1 is deteriorated and the manufacturing cost is increased. Further, since the inner surface 5a of the flexible wiring board 5 is still in a state of rubbing with the sheet metal case 1 which is significantly harder than the flexible wiring board 5, it is possible to reliably prevent the flexible wiring board 5 from being inadvertently damaged. Challenges remain.
[0011]
Therefore, the present invention has been made in view of the above problems, and has as its object to provide a liquid crystal display device that can easily and reliably prevent inadvertent damage to a flexible wiring board connected to a liquid crystal panel. Is what you do.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, a liquid crystal display device according to the present invention includes a sheet metal case having a bottom wall and a side wall bent from an edge of the bottom wall, and a sheet metal case disposed along an inner surface of the side wall of the sheet metal case. A resin frame provided, a liquid crystal panel having an edge supported by the resin frame, a printed circuit board disposed on an outer surface of a bottom wall of the sheet metal case facing the liquid crystal panel, and the liquid crystal panel and the liquid crystal panel. A flexible printed circuit board, which connects printed circuit boards to each other and protrudes laterally from the ends of each other, and is curved outside the side wall of the sheet metal case. A projecting portion projecting laterally from the outer surface of the side wall of the case is formed.
[0013]
Thus, even if burrs remain laterally at the tip corners of the outer surface of the side wall of the sheet metal case, the inner surface of the flexible wiring board does not come into contact with the burrs at all, and a relatively soft resin frame is formed. It is placed in a situation where it comes close to or in contact with the protrusion.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. First, a first embodiment of the present invention will be described. FIG. 1 is an exploded perspective view showing an example of the liquid crystal display device of the first embodiment, FIG. 2 is a longitudinal sectional view of a main part of the liquid crystal display device, and FIG. It is an assembly perspective view which shows an example which changed the range. In the figure, parts having the same names and the same functions as those in FIG. 5 are denoted by the same reference numerals, and overlapping description will be omitted. The same applies to a second embodiment described later.
[0015]
As shown in these figures, the liquid crystal display device of the present embodiment includes a sheet metal case 1, a resin frame 2, a liquid crystal panel 3, and a liquid crystal display device similar to a conventional liquid crystal display device to which a backlight is applied (see FIG. 5). , A printed circuit board 4, a flexible wiring board 5, and a lighting device 6. These are arranged and assembled in the order of the liquid crystal panel 3, the resin frame 2, the lighting device 6, the sheet metal case 1, and the printed circuit board 4, and the flexible wiring board 5 is connected to the end of each of the liquid crystal panel 3 and the printed circuit board 4. It is disposed in a curved state outside the side wall 1b of the sheet metal case 1 while protruding sideways from the side. At this time, the sheet metal case 1 and the resin frame 2 are provided with a square hole 1d provided in each side wall 1b of the sheet metal case 1 and a convex portion 2a provided on the outer surface of the resin frame 2 corresponding to the square hole 1d. Is fixed by the engagement with.
[0016]
Here, the resin frame 2 which is a characteristic part of the present embodiment will be described in detail. On the side of the resin frame 2 where the flexible wiring board 5 is located, a protruding portion 2b that protrudes laterally beyond its outer surface while covering the tip of the side wall 1b of the sheet metal case 1 is integrally formed. The protruding portion 2b is formed so as to face the flexible wiring board 5 and have a width substantially equal to that of the flexible wiring board 5 (see FIG. 1). However, the protrusions 2b may be formed at intervals so as to be continuous in this range.
[0017]
In the liquid crystal display device having such a resin frame 2, even if the burr 1c at the tip corner of the outer surface of the side wall 1b of the sheet metal case 1 generated by the press working remains laterally, the flexible wiring board The inner surface 5a of the resin frame 5 does not come into contact with the burrs 1c at all, and is placed in a state of approaching or coming into contact with the projecting portion 2b of the resin frame 2. Therefore, the situation in which the inner surface 5a of the flexible wiring board 5 and the burr 1c rub against each other is completely eliminated, so that careless damage including disconnection of the flexible wiring board 5 can be reliably prevented.
[0018]
Incidentally, the inner surface 5a of the flexible wiring board 5 may be inadvertently rubbed with the protruding portion 2b. However, since the protruding portion 2b is made of a relatively soft resin like the resin frame 2, the frictional resistance given to the inner surface 5a is increased. Is extremely small, and hardly affects the damage of the flexible wiring board 5.
[0019]
In this embodiment, there is no need to perform any additional processing on the sheet metal case 1, and therefore there is no reduction in production efficiency and no increase in manufacturing cost for the sheet metal case 1. Of course, it is necessary to form the protruding portions 2b on the resin frame 2, but by integrally molding them, the increase in manufacturing cost and the like can be remarkably suppressed.
[0020]
Further, the formation range of the protruding portion 2b is not limited to the range according to the width of the flexible wiring board 5 as described above, and may be a range sufficiently wider than the width of the flexible wiring board 5 as shown in FIG. It may be formed from end to end. In this case, since it is possible to immediately respond to the flexible wiring board 5 of any width, it is advantageous in that it has versatility.
[0021]
Next, a second embodiment of the present invention will be described with reference to FIG. FIG. 4 is a longitudinal sectional view of a main part of the liquid crystal display device of the second embodiment. The feature of the second embodiment is that the vertical cross-sectional shape of the projecting portion 2b of the resin frame 2 in the first embodiment is modified.
[0022]
That is, as shown in FIG. 4, the protruding portion 2 b of the resin frame 2 has a protruding piece 2 c whose tip is bent and which is close to the outer surface of the tip of the side wall 1 b of the sheet metal case 1. In the liquid crystal display device provided with such a resin frame 2, the projection 2 c serves as a barrier, so that it is possible to prevent foreign substances such as dust and dust floating outside from entering the interior of the lighting device 6.
[0023]
Note that the tip of the protruding portion 2b which is in a state of approaching or in contact with the inner surface 5a of the flexible wiring board 5 may be chamfered along the curve of the flexible wiring board 5 without being angular (see FIG. 4). ). In this case, the starting point of the bending of the flexible wiring board 5 can be positioned inside, that is, on the liquid crystal panel 3 side. Accordingly, the bending portion of the flexible wiring board 5 projecting most sideways is positioned inside. And the width of the entire liquid crystal display device can be suppressed.
[0024]
In addition, the present invention is not limited to the above embodiments, and various modifications can be made without departing from the spirit of the present invention.
[0025]
【The invention's effect】
As described above, according to the present invention, a sheet metal case having a bottom wall and a side wall bent from an edge of the bottom wall, and a resin disposed along an inner surface of the side wall of the sheet metal case. A frame, a liquid crystal panel having an edge supported by the resin frame, a printed circuit board facing the liquid crystal panel and disposed on an outer surface of a bottom wall of the sheet metal case, and the liquid crystal panel and the printed circuit board. Connected to each other, and a flexible wiring board that is curved outside the side wall of the sheet metal case while protruding laterally from the ends of the liquid crystal display device. Since the protrusion protruding laterally from the outer surface is formed, even if burrs remain laterally at the tip corner of the outer surface on the side wall of the sheet metal case, the inner surface of the flexible wiring board is Without completely contacting the burr, placed under conditions close to or in contact with the projecting portion of the relatively soft resin frame. Therefore, the situation where the inner surface of the flexible wiring board rubs against the burrs is completely eliminated, so that careless damage including disconnection of the flexible wiring board can be reliably prevented.
[Brief description of the drawings]
FIG. 1 is an exploded perspective view illustrating an example of a liquid crystal display device according to a first embodiment of the present invention.
FIG. 2 is a longitudinal sectional view of a main part of the liquid crystal display device of the first embodiment.
FIG. 3 is an assembly perspective view showing an example in which a forming range of a protrusion of a resin frame in the liquid crystal display device of FIG. 1 is modified.
FIG. 4 is a longitudinal sectional view of a main part of a liquid crystal display device according to a second embodiment of the present invention.
FIG. 5 is a longitudinal sectional view of a main part of a conventional liquid crystal display device.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Sheet metal case 1a Bottom wall 1b Side wall 1c Burr 1d Square hole 2 Resin frame 2a Projection 2b Projection 2c Projection 3 Liquid crystal panel 4 Printed circuit board 5 Flexible wiring board 5a Inner surface 6 Lighting device

Claims (2)

A sheet metal case having a pressed bottom wall and a side wall bent from the edge of the bottom wall; a resin frame disposed along the inner surface of the side wall of the sheet metal case; and an edge supported by the resin frame. A liquid crystal panel, a printed circuit board facing the liquid crystal panel and disposed on an outer surface of a bottom wall of the sheet metal case, and connecting the liquid crystal panel and the printed circuit board to each other. A flexible wiring board that protrudes toward the outside and is curved outside the side wall of the sheet metal case,
A liquid crystal display device, wherein the resin frame has a protruding portion that protrudes laterally from an outer surface of a side wall of the sheet metal case. 2. The liquid crystal display device according to claim 1, wherein the protruding portion has a protruding piece that is close to an outer surface of a front end of the side wall of the sheet metal case. 3.

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