JP2005267852A - Backlight reflecting plate - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To allow a backlight reflecting plate to cope with increase of its size and increase of its production. <P>SOLUTION: This backlight reflecting plate is installed behind a plurality of fluorescent lamps 3 arranged in parallel with one another to support the fluorescent lamps 3 and to reflect light emitted from the fluorescent lamps 3 frontward. In the backlight reflecting plate, a metal plate is pressed into a box-like shallow shape to form a chassis body 1; projection parts 1a are projected frontward in parallel with the fluorescent lamps 3 in respective intermediate positions of a location of the chassis body 1 to which the fluorescent lamps 3 are projected; and boss parts 1b for mounting and supporting a circuit board or the like are projected on the back face of the chassis body 1. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a structure of a reflector portion of a backlight device provided as a light source of a liquid crystal display device such as a liquid crystal television. More specifically, the backlight reflector is formed by pressing a metal plate and reinforcing protrusions. And a backlight reflector having increased rigidity.

  The backlight reflector of a large liquid crystal display device has an optical function of reflecting light emitted from a light source such as a fluorescent lamp forward and structurally supports the entire liquid crystal display device including the display panel. For this reason, in the conventional backlight reflector, a frame is formed by die casting made of a light alloy such as aluminum, and a metal reflector is attached thereto. In the manufacturing process, it is necessary to set a frame formed by die casting on a machine tool and perform the cutting process. This cutting process takes the most time in the process of each part of the liquid crystal display device. It was a bottleneck when trying to increase the production of backlight reflectors with the increased production of equipment. Therefore, conventionally, in order to increase the production of liquid crystal display devices, it is necessary to prepare a plurality of machine tools, which requires a large expense for capital investment. Moreover, since the life of the die-casting die is about 100,000 times when using aluminum and about 200,000 times when using magnesium, it is troublesome because it is necessary to update the die frequently when increasing production. .

  As a countermeasure, it is considered that the frame of the backlight reflector is not manufactured by die-casting, so that it is not necessary to cut the frame. As a result, an extruded member that is structurally strong and rigid. Patent Documents 1 and 2 propose backlight reflectors that are combined to form a frame. The flat display device described in Patent Document 1 is configured by connecting a horizontal frame 15 having a U-shaped cross section and a rectangular cylindrical vertical frame 16 to each other via a corner member 17 to form a rectangular frame. The display panel 18 is coupled and held on the front side of the frame, and the backlight 39 is disposed inside the frame. In the panel type display device described in Patent Document 2, a rectangular frame 25 in which extruded materials such as rectangular steel pipes are combined is used as a mounting means for the display panel 32, circuit boards 59 and 60, the backlight 40, and the optical panel 48. The lamp can be replaced only by taking out the light 40.

FIG. 3 is a cross-sectional view of a liquid crystal television using a conventional backlight device. In the figure, reference numeral 1 denotes a chassis which is a backlight reflector. A reflective sheet 2 made of white resin is laid on the inside of the chassis 1 and a fluorescent lamp 3 as a light source is supported in parallel by a lamp holder 4 on the upper side. Has been. The reflection sheet 2 located in the middle of each of these fluorescent lamps 3 is bent into a mountain shape in cross section to enhance the reflection efficiency of the fluorescent lamp 3. A diffusion plate 5 is disposed in front of the fluorescent lamp 3 so as to be supported by an outer peripheral edge portion of the chassis 1. A prism sheet 6 and a polarization reflection sheet 7 are laminated on the diffusion plate 5, and a liquid crystal panel unit 8 is disposed above the prism sheet 6 and the polarization reflection sheet 7. In the figure, illustration of a circuit board and the like supported on the rear surface of the chassis 1 is omitted.
JP-A-11-146305 JP 2000-92415 A

  However, since the flat display device described in Patent Document 1 connects the horizontal frame 15 and the vertical frame 16 via the dedicated corner member 17, the number of parts increases by the corner member 17, and the cost increases. At the same time, the inside of the frame made up of the horizontal frame 15 and the vertical frame 16 is structurally hollow, so that the strength and rigidity of the frame 25 are insufficient, and it is difficult to increase the size as it is. In addition, the panel type display device described in Patent Document 2 forms a rectangular frame 25 that is a combination of extruded materials such as rectangular steel pipes, but the inside of the rectangular frame 25 is structurally hollow, The strength and rigidity of the frame 25 were insufficient, and it was difficult to increase the size as it was. Accordingly, an object of the present invention is to propose a backlight reflector that is simple to manufacture, has excellent strength and rigidity, and can be easily increased in size and increased in production.

  In order to solve the above problems, a backlight reflector according to the present invention is formed by pressing a metal plate into a shallow box shape to form a main body, and at the same time, a plurality of protrusions are provided at an appropriate interval on the bottom surface of the main body. Form in parallel. In the backlight reflector according to the present invention, a metal plate is press-molded into a shallow box shape to form a main body, and a plurality of protrusions are linearly formed on the bottom surface of the main body. Specifically, in a backlight reflector that is installed behind a plurality of linear light sources arranged in parallel and supports the light source and reflects light emitted from the light source forward, the metal plate is formed in a shallow box shape. And a plurality of protrusions protruding forward in parallel with the arrangement of the light sources in the vicinity of the position where the light sources of the main body are supported. Further, in a backlight reflector that is installed behind a plurality of linear light sources arranged in parallel and supports the light source and reflects light emitted from the light source forward, the metal plate is formed into a shallow box shape. A main body obtained by press molding, and a plurality of protrusions projecting forward in parallel with the arrangement of the light sources between positions where the light sources of the main body are supported. Further, in a backlight reflector that is installed behind a plurality of linear light sources arranged in parallel and supports the light source and reflects light emitted from the light source forward, the metal plate is formed into a shallow box shape. A main body obtained by press molding, and a plurality of protrusions projecting forward in parallel with the arrangement of the light sources at positions intermediate between positions where the light sources of the main body are supported. Here, it is preferable that a reflection sheet is laid on the front surface of the main body, and a bent portion of the reflection sheet is disposed in front of the protruding portion. Moreover, it is preferable to project a boss portion that attaches and supports at least one plate-like member to the back surface of the main body. Furthermore, it is preferable that a plurality of the boss portions protrude from the back surface of the main body at positions parallel to the arrangement of the light sources. Further, at least one of the plate-like members attached to the back surface of the main body can be a circuit board.

  As described above, according to the present invention, the metal plate is press-molded into a shallow box shape to form a main body and a plurality of protrusions parallel to the bottom surface of the main body are formed at appropriate intervals. In addition to providing sufficient rigidity and strength, it is not necessary to cut with a machine tool as in the case of die-casting, greatly reducing the number of man-hours required for production and increasing the size and production of the backlight device. It can be easily handled.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of a backlight reflector according to the present invention as viewed from the back side, and FIG. 2 is a cross-sectional view showing a backlight device using the backlight reflector of FIG. As shown in the figure, the chassis 1 serving as a backlight reflector is formed by forming a metal plate into a shallow box by press forming, and has a bead-shaped protrusion 1a on the surface side in the longitudinal direction of the bottom. It is formed so as to protrude. The protruding portion 1a is provided to increase the rigidity and strength of the chassis 1, and the protruding portion 1a corresponds to the position where the reflection sheet 2 laid on the surface side of the chassis 1 is bent into a cross-sectional mountain shape. Is formed. Further, as shown in FIG. 1, a plurality of bosses 1 b are projected from the back side of the bottom of the chassis 1 at appropriate intervals. Although not shown, a circuit board or the like is attached to the boss 1b.

  When the backlight device is configured using the chassis 1 described above, it is as shown in FIG. That is, a reflective sheet 2 made of white resin is laid inside the press-molded chassis 1, and a fluorescent lamp 3 as a light source is supported in parallel by the lamp holder 4 above the reflective sheet 2. In front of the bead-shaped protrusions 1a located in the middle of these fluorescent lamps 3, the reflection sheet 2 is bent into a mountain shape in cross section to increase the reflection efficiency of the fluorescent lamp 3. A diffusion plate 5 is disposed in front of the fluorescent lamp 3 so as to be supported by an outer peripheral edge portion of the chassis 1. A prism sheet 6 and a polarization reflection sheet 7 are laminated on the diffusion plate 5, and a liquid crystal panel unit 8 is disposed above the prism sheet 6 and the polarization reflection sheet 7. In the figure, illustration of a circuit board and the like supported on the rear surface of the chassis 1 is omitted.

  In the illustrated example, the protruding portion 1a is formed in a bead shape having a semicircular cross section. However, as another shape, the cross section may be a triangular shape, a quadrangular shape, a corrugated shape, or the like. In the present invention, the chassis 1 is formed from a metal plate by press molding, and the protrusion 1a is formed to increase the strength and rigidity. Therefore, the backlight device can be increased in size without increasing the weight. Further, since the boss 1b is formed on the back surface of the chassis 1 by press molding, sufficient dimensional accuracy and smoothness can be obtained at the tip of the boss 1b. Therefore, it is necessary to finish the surface by machining as in the case of die casting. It is possible to attach a circuit board or the like as it is, and it is possible to cope with an increase in production.

  The present invention can be applied to a frame structure portion of a thin display device of another display method such as a PDP, in addition to a backlight reflector of a liquid crystal display device such as a liquid crystal television.

It is the perspective view which looked at the backlight reflecting plate concerning the present invention from the back. It is a cross-sectional view of a backlight device using the backlight reflector of FIG. It is a cross-sectional view of a conventional example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Chassis 1a Protrusion part 1b Boss part 2 Reflection sheet 3 Fluorescent lamp 4 Lamp holder 5 Diffusion plate 6 Prism sheet 7 Polarization reflection sheet 8 Liquid crystal panel unit

Claims (9)

A backlight reflector according to claim 1, wherein a metal plate is press-formed into a shallow box shape to form a main body, and a plurality of protrusions are formed in parallel on the bottom surface of the main body at appropriate intervals. A backlight reflector, wherein a metal plate is press-formed into a shallow box shape to form a main body, and a plurality of protrusions are linearly formed on the bottom surface of the main body. In a backlight reflector that is installed behind a plurality of linear light sources arranged in parallel and supports the light source and reflects light emitted from the light source forward,
A body obtained by pressing a metal plate into a shallow box,
A plurality of protrusions projecting forward in parallel with the arrangement of the light sources in the vicinity of the position where the light sources of the main body are supported;
A backlight reflector characterized by comprising: In a backlight reflector that is installed behind a plurality of linear light sources arranged in parallel and supports the light source and reflects light emitted from the light source forward,
A body obtained by pressing a metal plate into a shallow box,
A plurality of protrusions protruding forward in parallel with the arrangement of the light sources between positions where the light sources of the main body are supported;
A backlight reflector characterized by comprising: In a backlight reflector that is installed behind a plurality of linear light sources arranged in parallel and supports the light source and reflects light emitted from the light source forward,
A body obtained by pressing a metal plate into a shallow box,
A plurality of projecting portions projecting forward in parallel with the arrangement of the light sources at respective positions in the middle of the positions where the light sources of the main body are supported;
A backlight reflector characterized by comprising: In the backlight reflecting plate according to any one of claims 1 to 5,
A backlight reflecting plate, wherein a reflecting sheet is laid on the front surface of the main body, and a bent portion of the reflecting sheet is disposed in front of the protruding portion. In the backlight reflecting plate according to any one of claims 1 to 6,
A backlight reflecting plate characterized in that a boss portion for attaching and supporting at least one or more plate-like members is provided on the back surface of the main body. In the backlight reflector according to claim 7,
A backlight reflector according to claim 1, wherein a plurality of the boss portions are provided on a rear surface of the main body so as to protrude in parallel with the arrangement of the light sources. The backlight reflector according to claim 7 or 8,
At least one of the plate-like members attached to the back surface of the main body is a circuit board.

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