JP2010256586A - Liquid crystal module and video display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a technology to enhance mechanical strength of a back plate of a backlight device of a liquid crystal module without affecting thinning or weight reduction of a video display. <P>SOLUTION: The liquid crystal module includes a liquid crystal panel and a direct-lighting backlight device disposed on a back face of the liquid crystal panel. The backlight device includes a back plate 3 disposed on the back face thereof. The back plate 3 includes fixing means 4 and 5 for fixing the liquid crystal module to a member 6 of the video display which should incorporate the liquid crystal module in a predetermined in-plane position. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a direct-type backlight type liquid crystal module and an image display device using the same, and more particularly to reinforcing the strength of the liquid crystal module.

  In the conventional direct-type backlight type liquid crystal module, the central portion of the backlight device is deformed by external pressure or thermal expansion. As a result, there is a problem that uneven brightness occurs, or that the lamp approaches the back plate and the vibration noise of the lamp increases. This problem is particularly noticeable when the size is increased and the thickness and weight are reduced.

  FIG. 4 is a cross-sectional view of the central portion showing a conventional direct-type backlight type liquid crystal module. A liquid crystal panel 11 is arranged on the front side, and an optical sheet 12 and a diffusion plate 13 are provided on the back side. Further, a lamp 14 and a back sheet metal 3 of the backlight device are provided on the back side. Spacer pins 15 are provided between the back sheet metal 3 and the diffusion plate 13 to form a predetermined gap.

  However, due to the heat generated by the lamp 14 and the heat generated in the video display device in which the liquid crystal module is incorporated, the central portion of the liquid crystal module is deformed to the front side to cause bending. When such bending occurs, the thickness of the central portion of the liquid crystal panel 11 is reduced and the thickness of the internal liquid crystal portion is also reduced, so that a difference in liquid crystal transmission occurs and ring-like luminance unevenness (white unevenness) occurs. There is a case. In addition, this bending may cause wrinkles in the optical sheet 12 of the liquid crystal module, resulting in uneven brightness.

  If the spacer pin 15 is not provided in the vicinity of the center, the distance A between the lamp 14 and the back sheet metal 3 is shortened, and the vibration noise generated by the lamp 14, particularly the darkness that changes the duty ratio of the inverter drive voltage (Dimming ) Low frequency vibration of the frequency increases, and it may be heard as an unpleasant sound even if it is away from the video display device.

  Further, since the bending is repeated by repeatedly turning on and off the power of the video display device, the stress applied to the lamp 14 is accumulated and the lamp 14 may be damaged.

  As measures for improving these problems, the liquid crystal display device of Patent Document 1 adds transparent reinforcing plates above and below the diffusion plate of the backlight device. Further, in the display device of Patent Document 2, a honeycomb structure reinforcing material is added to the back side of the lamp mounting surface. Further, in recent years, it has been a mainstream to use a thin iron plate for the back casing of the backlight device in order to reduce the cost. In this case, the reinforcing method is press forming as shown in FIG. 5 for reinforcing drawing (embossing). It is generally known to apply 20.

Japanese Patent Laid-Open No. 2004-184861 JP 2007-287338 A

  In the liquid crystal display device of Patent Document 1, a transparent reinforcing plate of 6 mm or more is added above or below the diffusion plate of the backlight device, so that it is not suitable for the recent thin and light liquid crystal display device. Also, the cost increases significantly.

  Also in the display device of Patent Document 2, since a reinforcing material having a honeycomb structure is added to the back side of the lamp mounting surface, this is also not suitable for a thin and light display device. Also, the cost increases significantly.

  In addition, these configurations are effective for a single liquid crystal module, but when this is incorporated into a video display device by a conventional method, the back of the liquid crystal module is caused by heat generated from the internal circuit of the device or a temperature rise inside the housing. The effect is not sufficiently exhibited with respect to an increase in deformation of the central portion of the back sheet metal of the light device.

  Therefore, in view of the above-described problems, the present invention has an object to provide a technique for increasing the mechanical strength of the back sheet metal of the backlight device of the liquid crystal module without affecting the thinning and weight reduction of the video display device.

  A liquid crystal module of the present invention is a liquid crystal module including a liquid crystal panel and a direct type backlight device disposed on the back surface of the liquid crystal panel, and the backlight device is disposed on the back surface thereof. A back sheet metal is provided, and the back sheet metal is provided with fixing means for fixing to a constituent member of the video display device into which the liquid crystal module is to be incorporated at a predetermined in-plane position.

  Also, the video display device of the present invention is a video display device in which the liquid crystal module is incorporated, and the back sheet metal of the backlight device is fixed via the constituent members of the video display device and fixing means. And

  In the liquid crystal module of the present invention, the back sheet metal of the backlight device is provided with a fixing means for fixing to a constituent member of the video display device into which the liquid crystal module is to be incorporated at a predetermined in-plane position. Thereby, since the backlight device is fixed integrally with the video display device, the mechanical strength of the back sheet metal can be increased without adding a new reinforcing member.

  Further, in the video display device of the present invention, the back sheet metal 3 of the backlight device is fixed through a component of the video display device and a fixing means. Thereby, since the backlight device is fixed integrally with the video display device, the mechanical strength of the back sheet metal can be increased without adding a new reinforcing member.

It is the figure which made the structural member of the liquid crystal module of Embodiment 1, and an image display apparatus. It is the figure which made the structural member of the liquid crystal module of Embodiment 2, and an image display apparatus. It is the figure which made the structural member of the liquid crystal module of Embodiment 3, and an image display apparatus. It is sectional drawing of the center part of the liquid crystal module of a direct type backlight system. It is a figure which shows an example of the reinforcement method of the conventional backlight apparatus.

(Embodiment 1)
<Configuration>
FIG. 1 is a structural diagram showing the liquid crystal module 100 according to Embodiment 1 and the constituent member 200 of the video display device to which the liquid crystal module 100 is attached. The left figure is a view from the side, and the right figure is the view from the front. The liquid crystal module 100 of the present embodiment is of a direct backlight type, and a backlight device (not shown) is attached to the back surface of the liquid crystal panel (not shown), and a back plate is attached to the back side of the backlight device. 3 is provided. As a structural member 200 of the video display device, a circuit board fixing sheet metal 6 to which a circuit board is attached is shown as an example of a conventional member that is not newly provided.

  The back sheet metal 3 of the backlight device is provided with a boss 1 and an emboss 4 as fixing means for fixing to the circuit board fixing sheet metal 6. The boss 1 and the emboss 4 are threaded, and the back metal plate 3 of the backlight device is fixed to the circuit board fixing metal plate 6 with the screw 2 and the screw 5, respectively.

  The material of the boss 1 is selected from iron, copper, brass, etc. in consideration of processability, strength and price. In the present embodiment, cylindrical brass is used.

  The boss 1 is provided by being fixed by welding, screwing, rivets or the like at one place or a plurality of places, where reinforcement on the back sheet metal 3 of the backlight device is required. In the present embodiment, three places are fixed to the center portion of the back sheet metal 3 with rivets.

  The shape of the circuit board fixing sheet metal 6 needs to be at least the length over the mounting interval of the emboss 4 installed on the back sheet metal 3 of the backlight device. If there is not a sufficient length in the transverse direction, the reinforcement is insufficient with respect to the deflection at the center of the liquid crystal module.

  In Embodiments 1 and 3, the back metal plate 3 of the backlight device is provided with the external fixing boss 1 and the embosses 4 and 7 for reinforcement purposes in advance, but if there is no dedicated boss or emboss, It is also possible to integrally fasten with the constituent members of the video display device using the user hole for the purpose.

  Here, another purpose of the user hole is a mounting hole for a circuit board fixing sheet metal of a video display device that is already installed but is not originally used, a mounting hole for a cooling fan, or the like. Of course, the position of the user hole must be at least near the center of the back sheet metal 3 of the backlight device, and the height of the user hole should be the same as that of the constituent members of the video display device to be fixed.

  That is, the liquid crystal module of Embodiment 1 is a liquid crystal module including a liquid crystal panel and a direct type backlight device disposed on the back surface of the liquid crystal panel, and the backlight device is provided on the back surface thereof. The rear sheet metal 3 is provided, and the rear sheet metal 3 is provided with a fixing means for fixing to a constituent member of the video display device into which the liquid crystal module is to be incorporated at a predetermined in-plane position. Thereby, the back sheet metal 3 of the backlight device and the constituent members of the video display device are integrated by the fixing means, so that the mechanical strength of the back sheet metal can be increased without adding a new reinforcing member.

  Further, the fixing means is a boss 1 or an emboss 4 provided on the back sheet metal 3 of the backlight device. As a result, the back sheet metal 3 of the backlight device and the constituent members of the video display device are integrated with each other via the boss 1 and the emboss 4, so that the mechanical strength of the back sheet metal can be increased without adding a new reinforcing member. I can do it.

  Alternatively, the fixing means is a user hole for external fixing provided on the back sheet metal 3 of the backlight device. Since the back plate 3 of the backlight device and the constituent members of the video display device are integrated by the user hole, the mechanical strength of the back plate can be increased without adding a new reinforcing member.

  Further, the boss 1 or the emboss 4 and the constituent member 6 or the user hole and the constituent member 6 are fixed by screws. As a result, the back sheet metal 3 of the backlight device and the constituent members of the video display device are integrated by the screws 2 and 5 through the boss 1 and the emboss 4, so that the mechanical function of the back sheet metal can be achieved without adding a new reinforcing member. Strength can be increased.

  The video display device according to the first embodiment is a video display device in which a liquid crystal module including a liquid crystal panel and a direct-type backlight device disposed on the back surface of the liquid crystal panel is incorporated. The back sheet metal 3 of the apparatus is fixed through a constituent member 6 of the video display apparatus and a fixing means. Thereby, the back sheet metal 3 of the backlight device and the constituent members of the video display device are integrated by the fixing means, so that the mechanical strength of the back sheet metal can be increased without adding a new reinforcing member.

  The fixing means is characterized in that the boss 1 or the emboss 4 is fixed to the back sheet metal 3 of the backlight device. As a result, the back sheet metal 3 of the backlight device and the constituent members of the video display device are integrated with each other via the boss 1 and the emboss 4, so that the mechanical strength of the back sheet metal can be increased without adding a new reinforcing member. I can do it.

  Alternatively, the fixing means is a user hole for external fixing provided on the back sheet metal 3 of the backlight device. Since the back sheet metal 3 of the backlight device and the constituent members of the video display device are integrated by the user hole, the mechanical strength of the back sheet metal can be increased without adding a new reinforcing member.

  Further, the boss 1 or the emboss 4 and the constituent member 6 or the user hole and the constituent member 6 are fixed by screws 2 and 5. As a result, the back sheet metal 3 of the backlight device and the constituent members of the video display device are integrated by the screws 2 and 5 through the boss 1 and the emboss 4, so that the mechanical function of the back sheet metal can be achieved without adding a new reinforcing member. Strength can be increased.

<Effect>
According to the liquid crystal module of the first embodiment, the following effects can be obtained as described above. That is, the back sheet metal 3 is provided with a fixing means for fixing to a constituent member of the video display device into which the liquid crystal module is to be incorporated at a predetermined in-plane position. Thereby, the back sheet metal 3 of the backlight device and the constituent members of the video display device are integrated by the fixing means, so that the mechanical strength of the back sheet metal can be increased without adding a new reinforcing member.

  Further, since the back sheet metal 3 of the backlight device and the constituent members of the video display device are integrated via the boss 1 and the emboss 4 which are fixing means, the mechanical strength of the back sheet metal can be increased without adding a new reinforcing member. Can be increased.

  Alternatively, since the rear sheet metal 3 of the backlight device and the constituent members of the video display device are integrated by the user hole as the fixing means, the mechanical strength of the rear sheet metal can be increased without adding a new reinforcing member.

  Further, the boss 1 or the emboss 4 and the constituent member 6 or the user hole and the constituent member 6 are fixed by screws. As a result, the back sheet metal 3 of the backlight device and the constituent members of the video display device are integrated by the screws 2 and 5 through the boss 1 and the emboss 4, so that the mechanical function of the back sheet metal can be achieved without adding a new reinforcing member. Strength can be increased.

  Further, according to the video display device of the first embodiment, the following effects can be obtained as described above. That is, the back sheet metal 3 of the backlight device is fixed through the constituent member 6 of the video display device and the fixing means. Thereby, the back sheet metal 3 of the backlight device and the constituent members of the video display device are integrated by the fixing means, so that the mechanical strength of the back sheet metal can be increased without adding a new reinforcing member.

  Further, since the back sheet metal 3 of the backlight device and the constituent members of the video display device are integrated via the boss 1 and the emboss 4 which are fixing means, the mechanical strength of the back sheet metal can be increased without adding a new reinforcing member. Can be increased.

  Alternatively, since the rear sheet metal 3 of the backlight device and the constituent members of the video display device are integrated by the user hole as the fixing means, the mechanical strength of the rear sheet metal can be increased without adding a new reinforcing member.

  Further, the boss 1 or the emboss 4 and the constituent member 6 or the user hole and the constituent member 6 are fixed by screws 2 and 5. As a result, the back sheet metal 3 of the backlight device and the constituent members of the video display device are integrated by the screws 2 and 5 through the boss 1 and the emboss 4, so that the mechanical function of the back sheet metal can be achieved without adding a new reinforcing member. Strength can be increased.

(Embodiment 2)
<Configuration>
FIG. 2 is a structural diagram showing the liquid crystal module 100 according to the second embodiment and the constituent member 200 of the video display device to which the liquid crystal module 100 is attached. The left figure is a view seen from the side, the right figure is a view seen from the front, and the same components as those in the first embodiment are given the same numbers.

  In the first embodiment, the circuit board fixing sheet metal 6 has a rectangular shape, but in the second embodiment, a well shape as shown in FIG. Since the other configuration is substantially the same as that of the first embodiment, the description thereof is omitted. By fixing the back sheet metal 3 of the backlight device to the circuit board fixing sheet metal 6 with screws 2 and 5 through the boss 1 and the emboss 4, the back sheet metal 3 and the circuit board fixing sheet metal 6 are integrated.

<Effect>
In the present embodiment, the back sheet metal 3 of the backlight device is fixed to the circuit board fixing sheet metal 6 of the video display device with the above configuration. The liquid crystal module 100 and the circuit board fixing sheet metal 6 of the video display device are integrally structured by the boss 1 and the emboss 4 to ensure strength and prevent the center of the liquid crystal module from being bent due to external force or thermal expansion. I can do it.

(Embodiment 3)
<Configuration>
FIG. 3 is a structural diagram showing the liquid crystal module 100 according to the third embodiment and the constituent member 200 of the video display device to which the liquid crystal module 100 is attached. The left figure is a view seen from the side, the right figure is a view seen from the front, and the same components as those in the first embodiment are given the same numbers.

  In the first embodiment, the back plate 3 is fixed to the circuit board fixing plate 6 using the boss 1, but the boss 1 is not used in the third embodiment. Instead of the boss 1, the back sheet metal 3 is cut and raised by punching to form an emboss 7 for fixing. Other configurations are the same as those in the first embodiment.

  In the present embodiment, the embossing 7 is provided at three locations in the central portion of the back sheet metal 3, but is not limited to the central portion, and can be provided at a place where reinforcement on the back metal plate 3 is necessary. By fixing the back sheet metal 3 of the backlight device to the circuit board fixing sheet metal 6 with the screws 2 and 5 through the embosses 4 and 7, the back sheet metal 3 and the circuit board fixing sheet metal 6 are integrated.

<Effect>
In the present embodiment, the back sheet metal 3 of the backlight device is fixed to the circuit board fixing sheet metal 6 of the video display device with the above configuration. The liquid crystal module and the circuit board fixing sheet metal of the video display device are integrated with each other through the embosses 4 and 7 to secure the strength of the back sheet metal 3, and the center of the liquid crystal module bends due to external force or thermal expansion. Can be prevented.

  The present invention can be applied to a video display device such as a liquid crystal television receiver or a liquid crystal display monitor equipped with a direct backlight type liquid crystal module. Since no new reinforcing member is provided, it is effective for large, thin, and light-weight liquid crystal modules.

  DESCRIPTION OF SYMBOLS 1 Boss, 2,5 Screw, 3 Back plate | metal plate of a backlight apparatus, 4,7 Emboss 6 Circuit board fixing metal plate.

Claims (8)

LCD panel,
A direct-type backlight device disposed on the back of the liquid crystal panel;
A liquid crystal module comprising:
The backlight device includes a back sheet metal disposed on the back surface thereof,
The liquid crystal module according to claim 1, wherein the back sheet metal is provided with a fixing means for fixing to the constituent member of the video display device into which the liquid crystal module is to be incorporated at a predetermined in-plane position.   The liquid crystal module according to claim 1, wherein the fixing means is a boss or an emboss provided on a back sheet metal of the backlight device.   The liquid crystal module according to claim 1, wherein the fixing means is a user hole for external fixing provided on a back metal plate of the backlight device.   4. The liquid crystal module according to claim 2, wherein the boss or the emboss and the constituent member, or the user hole and the constituent member are fixed by screws. A video display device in which the liquid crystal module according to claim 1 is incorporated,
The video display device according to claim 1, wherein a back metal plate of the backlight device is fixed to a constituent member of the video display device via the fixing means.   The video display device according to claim 5, wherein the fixing means is a boss or an emboss fixed to a rear sheet metal of the backlight device.   6. The video display device according to claim 5, wherein the fixing means is a user hole for external fixing provided on a back metal plate of the backlight device.   The video display device according to claim 6 or 7, wherein the boss or the emboss and the constituent member, or the user hole and the constituent member are fixed by screws.

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