JP4312625B2 - Chassis for flat display device, flat display device, and chassis unit for flat display device - Google Patents

Description

  The present invention relates to a chassis used in a flat display device such as a liquid crystal display device, and is particularly suitable for a back chassis that supports constituent members such as a liquid crystal display panel.

  As the liquid crystal display device, for example, a configuration in which a light guide plate, an optical sheet, and a liquid crystal display panel are sequentially stacked on a back chassis and a bezel is covered from above is known.

  As the back chassis, a resin chassis having a quadrangular opening is known (for example, Patent Document 1). However, such a resin back chassis is weak against an external shock, and the internal components are affected by the shock. Have the problem of being easily damaged. In particular, the back chassis has a problem that it is easily deformed and broken by an impact in a direction (diagonal direction) connecting opposing vertices of a rectangular opening.

In addition, as a material considering impact resistance, a resin chassis having a rectangular opening is integrated with a reinforcing metal plate formed by sheet metal processing (for example, Patent Document 2). However, since this liquid crystal display device uses a metal plate in addition to the resin chassis, there is a problem that the number of parts is large and the cost is high. Further, if the metal plate is deformed when subjected to an impact, the subsequent use may be disabled.
Japanese Patent Laid-Open No. 10-68857 JP-A-11-149251

  Therefore, the present invention has been made in view of the above problems, and the present invention has a sufficient impact resistance, can reduce the number of parts, and can reduce the cost. It is an object to provide a chassis.

  The present invention has been made to solve the above problems, and the flat display device chassis according to the present invention is characterized in that the chassis main body has an opening having a small degree of freedom of distortion in the planar direction. .

  According to this invention which consists of the said structure, since the chassis main body has an opening part, the weight reduction of a chassis main body can be achieved. In addition, since the opening has a small degree of freedom of strain in the planar direction, the chassis body can exhibit sufficient strength. For this reason, unlike a conventional case in which a reinforcing metal plate is provided on a resin chassis (for example, Japanese Patent Publication No. 1999-149251), a reinforcing member is not necessarily required, thereby reducing the number of parts. It is also possible to contribute to cost reduction.

  In addition, it is preferable to form a plurality of the openings in the chassis body, which makes it possible to further reduce the weight.

  As such an opening of the chassis main body, a substantially triangular opening can be adopted. Here, the “substantially triangular shape” is not only a triangular shape configured by intersecting three straight lines, but also a shape configured by intersecting three curved lines, or in the vicinity of the apex, It is a concept including a shape having a curved portion, a bent line, and the like.

The substantially triangular opening is preferably provided so that two sides constituting the apex of the substantially triangular shape are continuous. Specifically, it is preferable to employ a configuration in which a shape that connects the vicinity of the apex of a substantially triangle with a bent line or a bent straight line or a configuration in which a curved portion is provided. Thereby, it can avoid exactly that stress concentrates on the substantially triangular vertex of an opening part. Here, for example, the curved portion is preferably formed in an arc shape having a curvature R in the range of the following formula. (In the formula, “<=” means that R on the left side is in the range below the right side)
R <= [{(− a + b + c) (a−b + c) (a + b−c)} / {4 (a + b + c)}] ^1/2
In this expression, a, b, and c mean the length of each side of a virtual triangle (a triangle formed by intersecting three straight lines).

  It is preferable that at least one side of the substantially triangular opening is adjacent to one side of the other substantially triangular opening or the outer edge of the chassis body and is substantially parallel. Thereby, a chassis can be reduced more in weight.

  In addition, it is preferable to provide a thicker portion at the edge of the opening than the surroundings, so that substantially the same strength as that obtained by making the whole thicker can be obtained and the weight can be reduced. . The above-mentioned “periphery” means a part located on the opposite side of the opening as viewed from the thick part.

Note that the chassis main body can be composed of, for example, any one of a fired product such as resin and ceramic, a metal, or at least two of these.
When the chassis body is made of resin, the weight of the chassis body can be reduced, and even if the chassis body is slightly deformed by an impact that does not cause breakage, the shape of the chassis body returns to its original shape due to the restoring force of the resin. Even after receiving an impact, the flat display device can be used continuously.

  In this case, it is preferable that the chassis main body is integrally formed of resin. Thereby, the amount of resin required when manufacturing a chassis main body can be reduced, and cost reduction can be aimed at more.

  In addition, when the chassis body is made of a fired product such as ceramic, extremely high strength can be obtained, and a heat dissipation effect can be expected based on the good radiation efficiency of the fired product such as ceramic. Therefore, it can be used in various fields such as space development.

  In some cases, the chassis main body has a substantially polygonal (for example, quadrangular) opening that is different from a triangle in order to attach a circuit board, for example. The substantially polygonal opening described above has a high degree of freedom in the planar direction, and there is concern about distortion in the diagonal direction. In this case, it is preferable to employ a configuration in which at least one side of the opening having a large degree of freedom of strain in the plane direction is adjacent to a portion having a small degree of freedom of strain in the direction of plane. Specifically, it is preferable that at least one side of the substantially polygonal opening is adjacent to a portion having a low degree of freedom in the planar direction (for example, one side of the substantially triangular opening or the outer edge of the chassis body). As a result, at least one side of the portion having a high degree of freedom in the planar direction is adjacent to a portion having a low degree of freedom in the planar direction (for example, one side of the substantially triangular opening or the outer edge of the chassis body). Can be limited.

  Similarly, when the chassis main body has a substantially polygonal opening region composed of a plurality of opening portions having a shape different from a substantially triangular shape, there is a concern about distortion in the diagonal direction of the opening region. In this case, it is preferable to employ a configuration in which at least one side of the opening region having a large degree of freedom of strain in the planar direction is adjacent to a portion having a small degree of freedom of strain in the planar direction. Specifically, at least one side of the substantially polygonal opening region is preferably adjacent to a portion having a low degree of freedom in the planar direction (for example, one side of the substantially triangular opening or the outer edge of the chassis body). As a result, at least one side of the portion having a high degree of freedom in the planar direction is adjacent to a portion having a low degree of freedom in the planar direction (for example, one side of the substantially triangular opening or the outer edge of the chassis body). Can be limited.

  Furthermore, in the case of having a substantially polygonal opening or opening region having a high degree of freedom of distortion in the planar direction as described above, a plurality of sides of the opening or opening region are portions where the degree of freedom in the planar direction is low. It is preferable to have a configuration adjacent to (one side of the substantially triangular opening or the outer edge of the chassis main body), whereby the strain in the planar direction can be further limited. The “a plurality of sides of the opening or opening region” adjacent to the portion having a low degree of freedom in the planar direction is most preferably all sides constituting the polygon, and other than one side. It is also preferable to be all sides (for example, three sides in the case of a rectangular opening), and all sides other than two adjacent sides (for example, two opposite sides in the case of a square opening) ) Is also possible. Moreover, it is preferable that the above-mentioned substantially polygonal opening or opening region is provided with a thicker portion at the edge than in the periphery.

  Moreover, it is preferable to employ | adopt the structure by which the engaging means with respect to a bezel is formed in the chassis main body so that the structural member to support may be closely supported in the thickness direction.

  As a result, when the engaging means is engaged with the bezel, a component member having a low degree of freedom of twisting, such as a light guide plate, can be closely supported in the thickness direction. It becomes possible to regulate. That is, even if the chassis body is formed to a thickness that has a degree of freedom of twisting, the degree of freedom of twisting is restricted by the component member (for example, the light guide plate), so the thickness of the chassis body is reduced. Can be reduced in weight.

  As described above, it is preferable that restricting means for restricting the sliding in the vertical direction of the thickness of the constituent member to be supported is formed on the chassis body. Thereby, it can prevent that a structural member (for example, light-guide plate) slides in a thickness perpendicular | vertical direction (plane direction) by a control means, and can prevent damage by an impact more correctly.

  The chassis as described above can be employed in flat display devices such as liquid crystal display devices and chassis units.

  Furthermore, the flat display device according to the present invention is a flat display device in which constituent members such as flat display elements are supported by the flat display device chassis, and the flat display device chassis has a small degree of freedom in the flat direction. A chassis main body having an opening is provided, and the constituent member is closely supported in the thickness direction by the chassis for a flat panel display device.

  The chassis unit according to the present invention is a chassis unit for a flat panel display device in which components such as a light guide plate are supported by the flat panel display device chassis, and the flat panel display unit chassis has a degree of freedom in a planar direction. A chassis main body having a small opening is provided, and the structural member is closely supported in the thickness direction on the flat panel display chassis.

By adopting such a configuration, the chassis main body has less freedom of distortion in the plane direction, and the chassis main body can exhibit sufficient strength, and a reinforcing member is not necessarily required, thereby reducing the number of parts. It is also possible to contribute to cost reduction.
Furthermore, since the flat display device chassis closely supports a component member (for example, a light guide plate) having a low degree of freedom in twisting in the thickness direction, the twist of the flat display device chassis can be regulated by the component member. .

  As described above, according to the present invention, the degree of freedom of distortion of the chassis main body in the planar direction is small and sufficient strength can be exhibited, and a conventional reinforcing metal plate is not necessarily required. It is possible to reduce the cost and contribute to cost reduction. Moreover, since the opening part is formed in the chassis main body, weight reduction can be achieved.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view of the liquid crystal display device of the present embodiment. 2 and 3 are explanatory views of the chassis of the liquid crystal display device of the embodiment, FIG. 2 is a plan view, and FIG. 3 is a bottom view. FIG. 4 is an enlarged cross-sectional side view of a main part of the liquid crystal display device of the embodiment.

  In the liquid crystal display device of the present embodiment, as shown in FIG. 1, constituent members such as a liquid crystal panel 500 as a flat display element are laminated and supported on a rectangular resin chassis 100 whose outer edge rises upward. Specifically, the reflection sheet 200, the light guide plate 300, the optical sheet 400, and the liquid crystal panel 500, which are reflection means, are sequentially stacked, and a metal bezel 600 is placed over the reflection sheet 200, so that each component 200,. The chassis 100 is closely supported in the thickness direction. In the resin chassis 100, a cold cathode tube 700 serving as a light source is accommodated inside the rising portion 110 at the outer edge so as to face the edge of the light guide plate 300 (see FIG. 4). In addition, the reflection sheet 200 has an edge 201 folded back in a U-shape, and the folded portion 201 is interposed between the cold cathode tube 700 and the resin chassis 100 so as to function as a reflector. Is provided. In the illustrated example, two L-shaped cold cathode fluorescent lamps 700 are arranged (not shown), and are provided so that light is supplied from four directions of the light guide plate 300. In the illustrated example, only one optical sheet 400 is illustrated, but provision of a plurality of sheets is also a matter whose design can be changed as appropriate.

  The resin chassis 100 is composed of a chassis main body 100 which is an integrally molded product of resin, and the chassis main body 100 has a plurality of (six in the illustrated example) openings 120 having a substantially triangular shape. Here, each of the substantially triangular openings 120 has a substantially right triangle shape, and one side constituting the right angle is adjacent to the outer edge (the rising portion 110) of the chassis body 100 and is provided in parallel. Further, the other side of the substantially triangular shape is provided substantially parallel to one side of the other adjacent opening.

In addition, the substantially triangular opening 120 is provided with a curved portion 121 in the vicinity of the apex so that two sides constituting the apex of the approximate triangle are continuous. Here, as the bending portion 121, one having a curvature R of the following formula is suitably used.
R <[{(− a + b + c) (a−b + c) (a + b−c)} / {4 (a + b + c)}] ^1/2
In this expression, a, b, and c mean the length of each side of a virtual triangle (a triangle formed by intersecting three straight lines).

  Furthermore, the chassis main body 100 has a substantially polygonal opening 130 different from a substantially triangular shape. Specifically, two substantially rectangular openings 130 for mounting a circuit board are formed. Of the two circuit board mounting openings 130, one opening 130 has two sides adjacent to the outer edge 110 of the chassis main body 100 and provided in parallel, and the other opening 130 is One side is adjacent to the outer edge 110 of the chassis body 100 and is provided in parallel.

  Further, two openings 140 are formed in the chassis main body 100 adjacent to the circuit board mounting openings 130, and the four openings 140 and the two circuit board mounting openings 130. The two openings 130 and 140 form a “substantially polygonal opening region including a plurality of openings 130 and 140 including openings having a shape different from a substantially triangular shape”. The opening region has two sides adjacent to the outer edge 110 of the chassis body 100 and provided in parallel, and the other two sides adjacent to the substantially triangular opening 120 and provided in parallel.

  The chassis main body 100 has a substantially circular opening 150 at the center in addition to the openings 120, 130, and 140 described above, and has a substantially rectangular opening 160 on both sides thereof.

  Also, the opening 120,... Described above is provided as a thick portion 170 whose edge is larger than the surroundings, and this thick portion 170 is formed on the bottom surface side of the chassis main body 100 as shown in FIG. Has been. In other words, the chassis main body 100 is formed so that the surface side on which the constituent members 200,... Are stacked is flush, and the thick portion 170 is formed by protruding toward the bottom surface at the edge of the opening 120,. .

  Furthermore, an engaging means 180 for the bezel 600 is formed on the outer surface of the edge portion 110 of the chassis main body 100, and this engaging means 180 is formed from a convex portion protruding outward from the edge portion 110 of the chassis main body 100. As shown in FIG. 4, the convex portion 180 is formed as a tapered surface 181 on the upper side. In the illustrated example, four convex portions 180 are formed on the long side of the chassis main body 100 and two are formed on the short side.

  Further, the bezel 600 is formed with a perforation 601 as an engaged means at a portion corresponding to the convex portion as the engaging means 180, and after the constituent members 200,. , The engaging member 180 and the engaged member 601 are engaged with each other, so that the constituent members 200 such as the light guide plate 300 are held in pressure contact with the chassis main body 100 side by the bezel 600. Will be.

  Further, the chassis main body 100 has restricting means 190 for restricting the sliding of the light guide plate 300 in the vertical direction (planar direction). The restricting means 190 is formed on the surface side of the chassis main body 100 (components are laminated). It is comprised from the convex part which protruded in the side to be done. As shown in FIG. 4, the convex portion 190 serving as the restricting means protrudes toward the surface side so as to contact the edge of the light guide plate 300. Further, in the illustrated example, three convex portions 190 are formed on the long side of the chassis main body 100 and two on the short side.

  Further, the reflection sheet 200 has a perforation 203 formed at a portion corresponding to the convex portion 190 as the restricting means, and the convex portion 190 as the restricting means protrudes from the perforation 203 of the reflective sheet 200 to the surface side. It is provided so as to regulate the sliding of the light guide plate 300.

  Furthermore, convex portions 191 for positioning the corners of the light guide plate 300 are formed at two opposite corners of the chassis main body 100. The light guide plate 300 is positioned by the depression 193 formed in the positioning convex portion 191, and the edge portion of the light guide plate 300 comes into contact with the convex portion 190 as the restricting means.

  In the liquid crystal display device according to the present embodiment having the above-described configuration, the opening 120 of the chassis body 100 has a substantially triangular shape. Therefore, the chassis body 100 has a sufficient degree of freedom in distortion in the plane direction and exhibits sufficient strength. be able to. For this reason, conventionally, the structural member 200,... Can be supported by the resin chassis 100 that does not require strength or that additionally requires a reinforcing metal plate, thereby reducing the number of parts and contributing to cost reduction. be able to.

  Further, the chassis main body 100 is integrally formed from resin and further has a plurality of openings 120 as described above. Therefore, the chassis main body 100 can be reduced in weight and the resin material can be reduced. Can contribute to cost reduction. In particular, since each side of the substantially triangular opening 120 is adjacent to and parallel to one side of the other substantially triangular opening 120 or the edge 110 of the chassis body 100, the weight of the resin material can be further reduced. Reduction can be achieved.

  The substantially square opening 130 for mounting the circuit board is also adjacent to and parallel to the edge 110 of the chassis main body 100, and the opening area including the opening 130 for mounting the circuit board is also substantially triangular. Since it is adjacent to and parallel to one side of the opening 120 of the shape or the edge 110 of the chassis main body 100, the strength of the portion can be sufficiently obtained, and the weight can be reduced and the resin material can be reduced. .

  Moreover, since the thick part 170 is provided in the edge part of the said opening part 120, ..., the intensity | strength substantially equivalent to what thickened the whole can be obtained, and it becomes possible to achieve weight reduction.

  The liquid crystal display device of the above embodiment has the above-described advantages due to the above configuration, but the present invention is not limited to the configuration of the above embodiment, and is appropriately designed within the intended scope of the present invention. It can be changed.

  That is, in the present invention, only the liquid crystal display device including the liquid crystal display panel 500 has been described. However, other flat display devices, a chassis used for the flat display device, and components such as a light source are integrated with the chassis. The chassis unit and the like that are made are within the range intended by the present invention.

  Further, in the above embodiment, since the curved portion 121 is provided in the vicinity of each vertex of the substantially triangular opening 120 of the chassis main body 100, it is possible to accurately avoid stress concentration on this vertex. However, the present invention is not limited to this. For example, as shown in FIG. 5, by adopting a configuration in which the vicinity of the apex is provided with a bent straight line 123, it is also possible to provide so as to avoid stress concentration on the substantially triangular apex. is there.

  Moreover, in the said embodiment, although the chassis main body 100 demonstrated what has the six substantially triangular opening parts 120, in this invention, the number of the substantially triangular opening parts 120 is not limited to this. For example, as shown in FIG. 6, two substantially triangular openings 120 are within the intended range of the present invention. In the above embodiment, the opening portion 120 having a substantially right triangle is employed. However, as shown in FIG. 7, it is also possible to employ the opening portion 120 having a substantially isosceles triangle shape. Furthermore, even when a substantially right-angled triangular opening 120 is employed, the arrangement shown in FIG. 8 can be employed. In other words, in the present invention, the number and arrangement of the plurality of substantially triangular openings 120 are matters whose design can be changed as appropriate. In addition, a circular opening may be employed as the opening having a small degree of freedom in the planar direction.

  Moreover, in the said embodiment, although the chassis 100 consisted only of the chassis main body which is a resin molded product, this invention is not limited to this, For example, the chassis main body 100 is comprised with a metal, Those composed of a fired product such as ceramic and those composed of at least two of a fired product such as metal, resin and ceramic are also within the intended scope of the present invention.

  Moreover, in the said embodiment, although the chassis was comprised only from the chassis main body 100 and this chassis main body 100 demonstrated what is an integral resin molded product, this invention is not limited to this, For example, a chassis main body It is also within the intended scope of the present invention that a plurality of parts 100 made of resin, metal, fired material, etc. are integrated by welding, screwing, locking or the like.

It is a disassembled perspective view of the liquid crystal display device of one Embodiment of this invention. It is a top view of the chassis of the liquid crystal display device of the embodiment. It is a bottom view of the chassis of the liquid crystal display device of the embodiment. It is sectional drawing in the AA of FIG. 2 of the liquid crystal display device of the embodiment. It is an enlarged plan view of the opening part of the chassis for liquid crystal display devices of other embodiment of this invention. It is a top view of the chassis for liquid crystal display devices of other embodiment of this invention. It is a top view of the chassis for liquid crystal display devices of other embodiment of this invention. It is a top view of the chassis for liquid crystal display devices of other embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 100 Resin chassis 110 Standing part 120 The substantially triangular opening part 121 The curved part 130 The substantially square-shaped opening part 140 for circuit board attachment The opening part 150 of an opening area | region Circular opening part 160 The substantially rectangular opening part 170 Thick part (Edge of opening)
180 Engagement means (convex part)
181 Tapered surface 190 Restricting means (convex part)
191 Positioning convex portion 193 Depression portion 200 Reflective sheet 201 Folded portion 203 Perforation 300 Light guide plate 400 Optical sheet 500 Liquid crystal panel 600 Bezel 601 Engagement means (perforation)
700 Cold cathode tube

Claims (17)

A flat display device chassis that supports structural members such as flat display elements in a flat display device,
The chassis body has a plurality of substantially triangular openings ,
At least one side of the substantially triangular opening is substantially parallel to one side of another adjacent substantially triangular opening;
The chassis body is formed to be flush with the surface side on which the constituent members are stacked, and has a thick portion that protrudes toward the bottom surface at the peripheral edge of the substantially triangular opening. A chassis for a flat display device. The chassis for a flat display device according to claim 1 ,
At least one side of the substantially triangular opening is adjacent to the outer edge of the chassis body and is substantially parallel to the chassis for a flat display device. The flat display device chassis according to claim 1 or 2,
  The chassis body is square,
  At least one side of the substantially triangular opening is adjacent to the diagonal of the chassis body and substantially parallel.
Chassis for flat panel display devices. The flat panel display chassis according to claim 3,
  At least one side of the substantially triangular opening is adjacent to and substantially parallel to a vertical bisector of one side of the chassis body.
Chassis for flat panel display devices. A flat display device chassis according to any one of claims 1 to 4,
The flat display device chassis, wherein the substantially triangular opening is provided with a curved portion in the vicinity of the apex so that two sides constituting the apex of the approximate triangle are continuous. A flat display device chassis according to any one of claims 1 to 4,
For the flat display device, the substantially triangular opening is provided with a shape connecting the vicinity of the vertex with a bend line or a bend line so that two sides constituting the apex of the substantially triangle are continuous. Chassis. A flat display device chassis according to any one of claims 1 to 6,
The chassis for a flat display device, wherein the chassis main body is made of resin. The flat panel display chassis according to claim 7 ,
The chassis for a flat display device, wherein the chassis main body is integrally formed of resin. A flat display device chassis according to any one of claims 1 to 6,
The chassis for a flat display device, wherein the chassis main body is made of a fired material such as ceramic. A flat display device chassis according to any one of claims 1 to 9,
The chassis body has a substantially polygonal opening different from a triangle ,
At least one side of the substantially polygonal opening different from the triangle or the substantially polygonal opening region including the opening is adjacent to one side of the substantially triangular opening or the outer edge of the chassis body. A chassis for flat display devices. A flat display device chassis according to any one of claims 1 to 10,
A chassis for a flat panel display device, wherein the chassis main body is formed with engaging means for the bezel so as to closely support the constituent members to be supported in the thickness direction. A flat display device chassis according to any one of claims 1 to 11,
A chassis for a flat panel display device, wherein the chassis main body is formed with restricting means for restricting sliding in the vertical direction of the thickness of a component to be supported. Flat display device, characterized in that it comprises a flat display device for the chassis according to any one of claims 1 to 12. A liquid crystal display device comprising: a flat display device for the chassis according to any one of claims 1 to 12. A flat display device in which components such as a flat display element are supported by a flat display device chassis,
The flat panel display chassis includes a chassis main body having a plurality of substantially triangular openings,
At least one side of the substantially triangular opening is substantially parallel to one side of another adjacent substantially triangular opening;
The chassis body is formed to be flush with the surface side on which the constituent members are stacked, and a thick portion is formed to protrude toward the bottom surface side at the peripheral edge of the substantially triangular opening,
2. The flat display device according to claim 1, wherein the structural member is closely supported by the flat display device chassis in a thickness direction. Flat display device chassis unit, characterized in that it comprises a flat display device for the chassis according to any one of claims 1 to 12. A flat panel display chassis unit in which a structural member such as a light guide plate is supported by the flat panel display chassis,
The flat panel display chassis includes a chassis main body having a plurality of substantially triangular openings,
At least one side of the substantially triangular opening is substantially parallel to one side of another adjacent substantially triangular opening;
The chassis body is formed to be flush with the surface side on which the constituent members are stacked, and a thick portion is formed to protrude toward the bottom surface side at the peripheral edge of the substantially triangular opening,
The flat panel display chassis unit, wherein the component member is closely supported in the thickness direction on the flat panel display chassis.

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