JP3920761B2 - Liquid crystal display - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid crystal display device, and more particularly to a liquid crystal display device suitable for a large screen.
[0002]
[Prior art]
In this type of conventional display device, an independent horizontal frame and vertical frame are connected by a connecting corner member to form a frame, and the liquid crystal panel is bonded and fixed to the front side of the horizontal frame and vertical frame with a double-sided adhesive. Have been disclosed (for example, Patent Document 1).
[0003]
In such a display device, it is disadvantageous in cost to prepare a corner member for coupling, and after the frame is assembled with the horizontal frame and the vertical frame, the liquid crystal panel is bonded to the frame with a double-sided adhesive. Since it is fixed, not only is the installation work cumbersome, but it is also difficult to stably support a heavy liquid crystal panel.
[0004]
The inventors of the present application have previously developed a liquid crystal display device that is an improvement on this prior art. Accordingly, the liquid crystal display device developed earlier will be described below with reference to FIGS. This liquid crystal display device accommodates a rectangular liquid crystal panel 1 so as to be surrounded by a panel housing frame 2 as shown in FIG. FIG. 6 shows a state in which the liquid crystal display device shown in FIG. 5 is disassembled. The liquid crystal panel 1 is formed by enclosing liquid crystals between a pair of glass substrates 11, and the outer surface of each glass substrate 11. Is laminated with an optical sheet 12 such as a polarizing film. A diffusion plate 3 is disposed on the back surface of the liquid crystal panel 1. A backlight 4 is disposed behind the diffusion plate 3. The backlight 4 includes a plurality of fluorescent lamps 41 extending in parallel with the long side direction of the liquid crystal panel 1, and a reflector 42 provided so that light from the fluorescent lamp 41 is effectively irradiated in the direction of the diffusion plate 3. Consists of. Both ends of the plurality of fluorescent lamps 41 and the reflecting plate 42 are supported by the backlight housing frame 5. A rectangular back cover 6 is disposed behind the backlight 4.
[0005]
Since the liquid crystal panel 1 is large, the panel housing frame 2 is divided into a panel housing frame short side member 100 and a panel housing frame long side member 200 in order to facilitate assembly. Each is formed of a metal plate having an L-shaped cross section. Inside the panel housing frame short side member 100, a resin intermediate member 7 for increasing the strength is arranged along the same.
[0006]
The backlight 4, the diffusion plate 3, and the liquid crystal panel 1 are integrated by adhering the panel housing frame 2 and the back cover 6 in a state where the backlight 4, the diffusion plate 3, and the liquid crystal panel 1 are sequentially stacked on the back cover 6.
[0007]
Next, details of the fixing portion will be described with reference to FIGS. 7 and 8. FIG. 7 shows a state where the fixing portion as a main part is disassembled, and FIG. 8 shows the fixing state.
[0008]
The panel receiving frame short side member 100 having an L-shaped cross section is formed with a holding side 102 that holds the edge of the liquid crystal panel 1 over the entire length on one side 101 constituting the L-shaped cross section. Then, the other side 103 constituting the L-shaped section is suspended to reach the back cover 6. At both ends of the panel housing frame short side member 100, an overhanging portion 104 that protrudes from one side 101 in the long side direction of the liquid crystal panel 1 is formed, and a piece 105 that hangs down from the tip of the overhanging portion 104 is formed. . The panel housing frame long side member 200 having an L-shaped cross section is formed with a clamping side 202 for clamping the edge of the liquid crystal panel 1 on one side 201 constituting the L-shaped cross section. The other side 203 constituting the L-shaped cross section is suspended so as to form the side surface of the liquid crystal display device. At both ends of one side 201 of the panel housing frame long side member 200, large notches 204 from which the holding side 202 is also removed to avoid the overhanging portion 104 are formed. On both ends of the other side 203 of the panel housing frame long side member 200, pieces 205 that overlap with the pieces 105 are formed.
[0009]
The reason why the bent portion such as the overhanging portion 104 and the piece 105 is provided on the panel housing frame short side member 100 side having the shorter length in this manner is advantageous in maintaining the overall strength. is there.
[0010]
On the other hand, corner portions 71 having a slightly bulging shape are provided at both ends of the intermediate frame 7. The corner portion 71 is formed with a rectangular guide projection 72 and a columnar guide projection 73. On the other hand, at both ends of one side 101 of the panel housing frame short side member 100, a rectangular opening 106 into which the rectangular guide projection 72 is inserted and an engaging cut where the cylindrical guide projection 73 engages. A notch 107 is formed.
[0011]
In this assembling method, first, as shown in FIGS. 6 and 7, the intermediate member 7 is placed on the short side of the liquid crystal panel 1 with the backlight 4, the diffusion plate 3, and the liquid crystal panel 1 sequentially stacked on the back cover 6. Along. The panel housing frame short side member 100 is made to extend along the short side of the liquid crystal panel 1 from the direction indicated by the arrow I. The rectangular guide protrusion 72 is inserted into the rectangular opening 106 and the engagement notch 107 has a circular shape. The columnar guide protrusion 73 is engaged with the intermediate member 7. On the other hand, the panel housing frame long side member 200 is extended along the long side of the liquid crystal panel 1 from the direction indicated by the arrow II. Thereafter, the panel housing frame short side member 100 and the panel are formed by a first fixing portion 16 including a tap hole 13 formed in the piece 105, a through hole 14 formed in the piece 205, and a screw 15 that is inserted and screwed into the through hole. The housing frame long side member 200 is fixedly joined at the end. Further, the second hole comprises a tap hole 17 formed at the edge of the back cover 6, a panel storage frame short piece member 100, a through hole 18 formed in the panel storage frame long side member 200, and a screw 19 that is inserted and screwed into the through hole 18. The panel receiving frame 2 and the back cover 6 are integrally fixed by the fixing portion 20.
[0012]
The integrally assembled liquid crystal display device supplies power to the fluorescent lamp 41, a control circuit (not shown) and the like, and supplies a video signal to display an image on the liquid crystal panel 1.
[0013]
Since such a large-screen liquid crystal display device is heavy, the panel housing frame that is integrally molded in advance cannot maintain the strength, and the panel housing frame short-side member 100 like the previously developed liquid crystal display device. The panel housing frame long side member 200 is divided into four parts and assembled. In this liquid crystal display device, the panel housing frame short side member 100 and the panel housing frame long side member 200 are directly coupled by the screw 15 so as to omit a corner member for coupling. Further, since the liquid crystal panel 1 is fixed to the panel housing frame 2 by the sandwiching sides 102 and 202 at the time of the coupling operation, the difficulty of the mounting operation can be improved and a stable support state can be obtained.
[0014]
[Patent Document 1]
Japanese Patent Laid-Open No. 11-146305
[Problems to be solved by the invention]
However, since the liquid crystal display device of the above-mentioned prior application directly couples the panel housing frame short side member 100 and the panel long side member 200, as shown by a part A in FIG. A gap is generated between the end and the tip of the protruding portion 104 of the panel housing frame short side member 100. Further, as shown by the portion B, a gap is also generated between the end of the panel storage frame long side member 200 and the corner portion 71. Therefore, there are the following problems.
[0016]
First, light in the liquid crystal display device leaks to the outside through the gap between the portions A and B. This leaked light has a problem in that the brightness, color, etc. are completely different from those of the image, which makes the user viewing the image feel uncomfortable and distracting. This leaked light is annoying for those who view the image even if it is small.
[0017]
Secondly, dust enters the liquid crystal display device from the parts A and B and adheres to the fluorescent lamp 41, the reflecting plate 42, the diffusion plate 5 and the like to cause a deterioration in quality, and also adheres to the electric circuit part. There were problems such as failure.
[0018]
Of course, it is conceivable that the dimensions of the panel housing frame short side member 100 and the panel housing frame long side member 200 are made with high accuracy so as to eliminate the gap. However, it is costly to process and finish a long member with high accuracy. Is impossible.
[0019]
Therefore, the present invention has been made in view of the above-described problems, and light in the liquid crystal display device is transmitted at a joint portion between the panel storage frame short side member and the panel storage frame long side member without cost. An object of the present invention is to provide a liquid crystal display device in which no leakage occurs.
[0020]
[Means for Solving the Problems]
In order to achieve the above object, a liquid crystal display device according to the present invention includes a liquid crystal panel, a backlight, a diffuser plate, a back cover, and an L-shaped cross section that sandwiches an edge of the liquid crystal panel on one side. A panel housing frame for housing the liquid crystal panel divided into a panel housing frame short side member and a panel housing frame long side member each having a side; a backlight housing frame for housing the backlight; A panel housing frame short side member of the L-shaped cross section, a projecting portion that projects from both ends of one side of the liquid crystal panel in the long side direction, a piece that is suspended from the projecting portion, and the panel housing A notch formed to avoid the overhang at both ends of one side constituting the L-shaped cross section of the frame long side member, and both on the other side constituting the L-shaped cross section of the panel housing frame long side member A first piece for joining and integrating the panel housing frame short side member and the panel housing frame long side member by fixing the piece provided to overlap the piece and the piece in an overlapped state. A fixing portion, and a second fixing portion for fixing the panel housing frame and the back cover in a state where the backlight, the diffusion plate, and the liquid crystal panel are placed on the back cover. In the liquid crystal display device, the panel housing frame short-side member is formed in a narrow shape at a distance from the edge of the liquid crystal panel so as to project in the longitudinal direction of the liquid crystal panel from both ends on one side. A narrow-shaped projecting portion is provided, a wide-shaped piece formed in a wide shape that hangs down from the whole is provided on the narrow-shaped projecting portion, and the sandwiching sides are provided at both ends of one side of the panel housing frame long side member. Leaving a part of that side The notch formed in order to avoid serial narrow shape extending portion provided is provided with a first fixing portion and the protruding piece and the wide-shaped pieces.
[0021]
Here, an intermediate member having a corner portion that bulges at both ends along the panel housing frame short side member is arranged, and the edge of the wide piece is formed so as to protrude to the corner portion. In addition to increasing the strength, the gap can be eliminated.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is an exploded perspective view showing a main part of a liquid crystal display device according to an example of an embodiment of the present invention, FIG. 2 is a perspective view showing a fixed state of the main part of the liquid crystal display device shown in FIG. FIG. 4 is an exploded perspective view of the liquid crystal display device shown in FIG. 3. FIG. 4 is an overall perspective view of the liquid crystal display device in an example of an embodiment of the present invention. The same parts as those of the conventional apparatus are denoted by the same reference numerals for the sake of convenience of description, and description thereof is omitted.
[0023]
Reference numeral 8 denotes a panel housing frame short side member that forms the short side of the panel housing frame 2 and is made of a metal plate having an L-shaped cross section. Reference numeral 9 denotes a panel housing frame long side member which forms the long side of the panel housing frame 2, and is also made of a metal plate having an L-shaped cross section. One side 81 constituting the L-shaped cross section of the panel housing frame short side member 8 is formed with a clamping side 82 for clamping the edge of the liquid crystal panel 1 over the entire length. At both ends of the one side 81, a narrow projecting portion 83 is provided which is formed so as to be narrow and spaced from the edge in the long side direction of the liquid crystal panel 1. On the side edge of the narrow projecting portion 83 on the side away from the liquid crystal panel 1, a wide strip 84 formed in a wide shape hanging from the whole is provided. The other side 85 constituting the L-shaped cross section hangs down to reach the back cover 6. As shown in FIG. 2, the wide piece 84 is formed so as to protrude to a position where the side edge approaches the corner portion 71 in a fixed state. In addition, a rectangular opening 86 into which the rectangular guide protrusion 72 is inserted and an engagement notch 87 with which the cylindrical guide protrusion 73 engages are formed at both ends of one side 81. One side 91 constituting the L-shaped cross section of the panel housing frame long side member 9 is formed with a clamping side 92 that holds the edge of the liquid crystal panel 1 over its entire length, and the other side 93 constituting the L-shaped cross section. Are suspended so as to form the side surface of the liquid crystal display device. At both ends of one side 91, a notch 94 is formed to avoid the narrow overhanging portion 83 that is left by leaving the clamping side 92 and a part of the one side 91 as it is. At both ends of the other side 93, protruding pieces 95 that overlap the wide-shaped piece 84 are formed.
[0024]
A tap hole 13 is formed in the wide piece 84, a through hole 14 is formed in the protruding piece 95, and a first fixing portion 16 formed by the tap hole 13, the through hole 14 and the screw 15 is provided. Through holes 18 are formed in the other side 83 and the one side 91, respectively, and a second fixing portion is provided by the through holes 18, the tap holes 17 of the back cover, and the screws 19.
[0025]
In the method of assembling the liquid crystal display device having such a configuration, first, as shown in FIGS. 1 and 4, the backlight 4, the diffusion plate 3, and the liquid crystal panel 1 are sequentially stacked on the back cover 6, and then the intermediate member 7. Along the short side of the liquid crystal panel 1. Then, the panel housing frame short side member 8 extends along the short side of the liquid crystal panel 1 from the direction indicated by the arrow I, but the rectangular guide protrusion 72 is inserted into the rectangular opening 86 and the engagement notch 87 has a circular shape. The columnar guide protrusion 73 is engaged with the intermediate member 7. On the other hand, the panel housing frame long side member 9 is made to extend along the long side of the liquid crystal panel 1 from the method indicated by the arrow II. After that, the panel housing frame short side member is formed by the first fixing portion 16 including the tap hole 13 formed in the wide piece 84, the through hole 14 formed in the protruding piece 95, and the screw 15 inserted and screwed into the through hole 14. 8 and the panel storage frame long side member 9 are fixedly joined at the end. Further, the second hole comprises a tap hole 17 formed in the edge of the back cover 6, a panel storage frame short piece member 8, a through hole 18 formed in the panel storage frame long side member 9, and a screw 19 inserted through and screwed into the second hole. The panel receiving frame 2 and the back cover 6 are integrally fixed by the fixing portion 20.
[0026]
As shown in FIG. 2, the liquid crystal display device assembled in this manner has no gap in the portion A because the holding side 92 and a part of one side 91 are continuously located. . At the same time, there is no gap in the portion B because the edge of the wide piece 84 is located in contact with the corner portion 71. Therefore, even if the fluorescent lamp 41 is turned on, the light inside the liquid crystal display device does not leak to the surface through the outside of the edge of the liquid crystal panel 1, and dust can enter the liquid crystal display device from the outside. Absent.
[0027]
In the present invention, the intermediate member 7 is provided in the example of the embodiment described above, but this may be omitted as necessary.
[0028]
【The invention's effect】
As described above, according to the present invention, the liquid crystal panel, the backlight, the diffusion plate, the back cover, and the sandwiching side that is formed in the L-shaped cross section and sandwiches the edge of the liquid crystal panel on one side. A panel housing frame for housing the liquid crystal panel divided into a panel housing frame short side member and a panel housing frame long side member, a backlight housing frame for housing the backlight, and the panel housing frame short A projecting portion that projects from both ends of one side constituting the L-shaped cross section of the side member in the long side direction of the liquid crystal panel, a piece that is suspended from the projecting portion, and the panel housing frame long side member A notch formed at both ends of one side constituting the L-shaped cross section of the panel housing frame to avoid the overhanging portion, and the pieces at both ends of the other side constituting the L-shaped cross section of the panel housing frame long side member. Overlap A first fixing portion for bonding and integrating the panel storage frame short-side member and the panel storage frame long-side member by fixing in a state where the pieces are overlapped, and the back surface In a liquid crystal display device including a second fixing portion for fixing the panel housing frame and the back cover in a state where the backlight, the diffusion plate, and the liquid crystal panel are placed on a cover in an overlapping manner. A narrow projecting portion formed by narrowing a distance from an edge of the liquid crystal panel to project in the longitudinal direction of the liquid crystal panel from both ends of one side of the panel housing frame short side member And a wide-shaped piece formed in a wide shape that hangs down from the whole is provided on the narrow-shaped projecting portion, and one end of the sandwiching side and one side of the one side of the panel housing frame long side member are provided. The narrow overhang leaving the part The notches are formed to avoid provided, by providing the first fixing portion and the protruding piece and the wide-shaped pieces, it is possible to provide a liquid crystal display device having the following effects.
[0029]
First, since a gap is not generated at the joint portion between the panel housing frame short side member and the panel housing frame long side member, light inside the liquid crystal display device does not leak to the surface, making it easier for the user to see the screen.
[0030]
Second, since no gap is generated, dust does not enter the inside of the liquid crystal display device and adhere to a fluorescent lamp, a reflecting plate, a diffusing plate, or the like, thereby reducing the quality. Moreover, dust does not adhere to the electric circuit portion and cause a failure.
[0031]
Third, because the holding side of the panel storage frame long side member and one side are continuously located without interruption to the end of the liquid crystal panel, the holding side and one side are uniformly over the entire length. Stress is applied. Therefore, it is possible to prevent an accident in which the stress is concentrated on a part and the breakage starts suddenly from a part. This is a large effect in a large liquid crystal display device because of its large weight.
[0032]
Here, an intermediate member having a corner portion that bulges at both ends along the short side member of the panel housing frame is arranged, and the edge of the wide piece is formed to protrude to a position approaching the corner portion. As a result, not only an increase in mechanical strength but also a gap can be reliably generated.
[Brief description of the drawings]
FIG. 1 is a perspective view showing a state before main parts of a liquid crystal display device according to an embodiment of the present invention are fixed.
FIG. 2 is a perspective view of the liquid crystal display device shown in FIG.
FIG. 3 is an overall perspective view of a liquid crystal display device according to an example of an embodiment of the present invention.
4 is an exploded perspective view of the liquid crystal display device shown in FIG. 3. FIG.
FIG. 5 is an overall perspective view of a liquid crystal display device previously developed by the present applicant.
6 is an exploded perspective view of the liquid crystal display device shown in FIG.
FIG. 7 is an exploded perspective view showing a main part of a liquid crystal display device previously developed by the present applicant.
FIG. 8 is a perspective view of the liquid crystal display device shown in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Liquid crystal panel 2 Panel accommodation frame 3 Diffusion plate 4 Backlight 5 Backlight accommodation frame 6 Back surface cover 7 Intermediate member 8 Panel accommodation frame short side member 9 Panel accommodation frame long side member 11 Glass substrate 12 Optical sheet 13 Tap hole 14 Through-hole 15 Screw 16 First fixing part 17 Tap hole 18 Through hole 19 Screw 20 Second fixing part 81 One side 82 Holding side 83 Narrow overhanging part 84 Wide piece 85 Other piece 91 One side 92 Side 93 The other side 94 Notch 95 Projection piece

Claims (3)

A panel housing frame short-side member and a panel housing frame long-side member, each having a liquid crystal panel, a backlight, a back cover, an L-shaped cross section, and a side for clamping the edge of the liquid crystal panel on one side A panel housing frame for housing the liquid crystal panel divided into two, a backlight housing frame for housing the backlight, and both ends of one side constituting an L-shaped cross section of the panel housing frame short side member The projecting portion provided to project in the long side direction of the liquid crystal panel, a piece provided to hang from the projecting portion, and the projecting to both ends of one side constituting the L-shaped cross section of the panel housing frame long side member In a state where the notch formed to avoid the portion, a piece provided so as to overlap the piece on both ends of the other side of the L-shaped cross section of the panel housing frame long side member, and the piece overlapped Stick A first fixing portion for coupling and integrating the panel housing frame short side member and the panel housing frame long side member, and the backlight and the liquid crystal panel placed on the back cover. In a liquid crystal display device comprising a second fixing portion for fixing the panel housing frame and the back cover in a state where
A narrow projecting portion formed by narrowing a distance from the edge of the liquid crystal panel is provided to project in the longitudinal direction of the liquid crystal panel from both ends on one side of the panel housing frame short side member. The narrow projecting portion is provided with a wide-shaped piece formed in a wide shape that hangs down from the whole, and the sandwiching side and a part of the one side are provided at both ends of one side of the panel housing frame long side member. And a notch formed to avoid the narrow overhanging portion, and the first fixing portion is provided on the wide piece and the protruding piece. . A panel storage frame short-side member and a panel storage, each having a liquid crystal panel, a backlight, a diffusion plate, a back cover, and a side for holding the edge of the liquid crystal panel formed on an L-shaped cross section. One of the panel housing frame for housing the liquid crystal panel divided into the frame long side member, the backlight housing frame for housing the backlight, and one of the L-shaped cross sections of the panel housing frame short side member A projecting portion that projects from both ends of the liquid crystal panel in the long side direction of the liquid crystal panel, a piece that is suspended from the projecting portion, and one side that constitutes the L-shaped cross section of the panel housing frame long side member A notch formed to avoid the protruding portion at both ends, a piece provided to overlap the piece at both ends of the other side of the L-shaped cross section of the panel housing frame long side member, and the piece Stacked A first fixing portion for connecting and integrating the panel housing frame short side member and the panel housing frame long side member by being fixed in a state, the backlight, the diffusion plate, and the In a liquid crystal display device comprising a second fixing portion for fixing the panel housing frame and the back cover in a state where the liquid crystal panel is placed in an overlapping manner,
A narrow projecting portion formed by narrowing a distance from the edge of the liquid crystal panel is provided to project in the longitudinal direction of the liquid crystal panel from both ends on one side of the panel housing frame short side member. A wide-shaped piece formed in a wide shape hanging from the whole is provided on the narrow-shaped projecting portion, and the sandwiching side and a part of the one side are provided at both ends of one side of the panel housing frame long side member And a notch formed to avoid the narrow overhanging portion, and the first fixing portion is provided on the wide piece and the protruding piece. . A panel storage frame short-side member and a panel storage, each having a liquid crystal panel, a backlight, a diffusion plate, a back cover, and a side for holding the edge of the liquid crystal panel formed on an L-shaped cross section. One of the panel housing frame for housing the liquid crystal panel divided into the frame long side member, the backlight housing frame for housing the backlight, and one of the L-shaped cross sections of the panel housing frame short side member A projecting portion that projects from both ends of the liquid crystal panel in the long side direction of the liquid crystal panel, a piece that is suspended from the projecting portion, and one side that constitutes the L-shaped cross section of the panel housing frame long side member A notch formed to avoid the protruding portion at both ends, a piece provided to overlap the piece at both ends of the other side of the L-shaped cross section of the panel housing frame long side member, and the piece Stacked A first fixing portion for connecting and integrating the panel housing frame short side member and the panel housing frame long side member by being fixed in a state, the backlight, the diffusion plate, and the A second fixing part for fixing the panel housing frame and the back cover in a state where the liquid crystal panel is placed on top of each other,
A narrow projecting portion formed by narrowing a distance from the edge of the liquid crystal panel is provided to project in the longitudinal direction of the liquid crystal panel from both ends on one side of the panel housing frame short side member. A wide-shaped piece formed in a wide shape hanging from the whole is provided on the narrow-shaped projecting portion, and the sandwiching side and a part of the one side are provided at both ends of one side of the panel housing frame long side member A liquid crystal display device provided with a notch formed to avoid the narrow overhanging portion and leaving the first fixing portion on the wide piece and the protruding piece,
An intermediate member having a corner portion that bulges at both ends along the panel housing frame short side member is disposed, and an edge of the wide-shaped piece is formed to protrude to a position approaching the corner portion. Liquid crystal display device.

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