JP4484751B2 - Backlight unit and liquid crystal display device including the same - Google Patents

Description

  The present invention relates to a backlight unit and a liquid crystal display device including the backlight unit.

  Notebook personal computers are always required to be downsized to improve portability. Along with this, miniaturization is also required for liquid crystal display devices built in notebook personal computers. Therefore, various means are considered for downsizing the backlight unit incorporated in the liquid crystal display device.

For example, in Patent Application 1, a light guide plate whose side end surface is a light incident surface, a linear light source provided laterally along the side end surface that is the light incident surface, and a longitudinal direction of the linear light source In the sidelight-side backlight device in which the electric wire extends to the other end in the longitudinal direction of the linear light source, the thickness of the light guide plate increases as the distance from the light incident surface increases. The back surface is inclined so as to be thin, and the lower space of the back surface of the light guide plate is increased as the plate thickness is reduced, and the electric wire is placed on the back surface side of the light guide plate with a distance from the light incident surface. The light source plate side end surface that extends to the other end in the longitudinal direction of the linear light source and is located in the lower space of the light guide plate that becomes larger as the light guide plate becomes thinner and at least a part of the electric wire is a light incident surface Disclosed above the lower edge And according to this, it is described that the size can be reduced without using a sheet-like wiring as an electric wire connected to the linear light source.
JP 2002-150823 A

  10 to 12 show the structure of the liquid crystal display device D 'or the backlight unit 10'.

  In general, the liquid crystal display device D 'includes a liquid crystal display panel 20' and a backlight unit 10 'provided behind the liquid crystal display panel 20'. The backlight unit 10 ′ is accommodated in a U-shaped reflector 12 ′ in which an elongated lamp 11 ′ is opened to the side, and a light guide plate 13 ′ is provided on the opening side of the reflector 12 ′. ing. In addition, a rubber elastic holder 14 'is attached to each of both ends of the lamp 11', and is provided at the end of the reflector 12 'so that a part protrudes from the end of the reflector 12'. The lamp 11 ′ is held by the reflector 12 ′ by the elastic holders 14 ′ provided at both ends of the lamp 11 ′. Further, a high-voltage lead wire 16 ′ provided so as to extend along the length direction on the outside of the reflector 12 ′ is inserted into a portion 14 a ′ protruding from the end of the reflector 12 ′ of one elastic holder 14 ′, and the lamp The low-voltage lead wire 17 'provided in the same manner is inserted into a portion protruding from the end of the reflector 12' of the other elastic holder and is electrically connected to the lamp 11 '. .

  By the way, in order to reduce the size of the backlight unit 10 ′ and the liquid crystal display device D ′, the lead wires 16 ′ and 17 ′ connected to both ends of the lamp 11 ′ also extend in the length direction outside the reflector 12 ′. It is provided so that it may extend along. Specifically, for example, as shown in FIG. 10A, the lead wires 16 'and 17' are provided outside the upper surface of the reflector 12 ', that is, on the liquid crystal display panel mounting side. In addition, as shown in FIG. 10 (b), it is provided on the outer side of the side opposite to the opening of the reflector 12 ', and as shown in FIG. 10 (c), it is provided outside the lower surface of the reflector 12'. In the case shown in FIG. 10A, the lead wires 16 'and 17' are accommodated in the chassis 23 ', so that it can be understood by comparing FIGS. 10A to 10C. As described above, the liquid crystal display device D ′ can be more effectively downsized. Then, the lead wires 16 'and 17' provided on the outside of the reflector 12 'are subsequently inserted into a portion protruding from the end of the reflector 12' of the elastic holder 14 'and electrically connected to the lamp 11'. The

  However, with the above configuration, as shown in FIG. 12A, the lead wires 16 ′ and 17 ′ come into contact with the end of the reflector 12 ′, thereby covering the lead wires 16 ′ and 17 ′. May be damaged and the core wire may be exposed. Since the reflector 12 'is generally made of metal, when the exposed core wires of the lead wires 16' and 17 'come into contact with the reflector 12', there is a problem that a short circuit occurs and a lighting failure of the backlight unit 10 'occurs. is there.

  As shown in FIG. 12B, this problem can be solved by sticking the insulating tape 30 ′ to the end of the reflector 12 ′. This will increase the cost.

  The present invention has been made in view of such points, and an object of the present invention is to provide a backlight unit capable of preventing a lead wire from coming into contact with an end of a reflector and being damaged, and the backlight unit. The object is to provide a liquid crystal display device.

The present invention for achieving the above object
An elongated lamp,
An elongated and side-shaped U-shaped reflector provided to accommodate the lamp;
An elastic holder attached to one end of the lamp and provided at a part of the end of the reflector so as to protrude from the end of the reflector, and holding the lamp on the reflector;
A lead wire that is provided so as to extend along the length direction outside the reflector and that is inserted into a portion protruding from the end of the reflector of the elastic holder and is electrically connected to the lamp;
With
The elastic holder is a backlight unit for a liquid crystal display device provided with lead wire contact blocking means for blocking the contact of the lead wire with the end of the reflector.

  According to the above configuration, the lead wire contact blocking means for blocking the contact of the lead wire with the end of the reflector is provided on the elastic holder, so that the lead wire contacts the end of the reflector and the covering material is damaged. Can be prevented. Accordingly, it is possible to prevent the lighting failure of the backlight unit due to the core wire being exposed due to the damage of the covering material of the lead wire, and coming into contact with the reflector to cause a short circuit. Further, since an independent member such as an insulating tape for preventing the lead wire from contacting the end of the reflector and a work process for providing the same are unnecessary, it occurs when such an independent member is provided. Such an increase in cost is prevented.

  Specific examples of the configuration of the lead wire contact blocking means include, for example, a lead wire contact blocking wall that is erected on the elastic holder and is elastically deformed so as to cover the end of the reflector by being pressed by the lead wire. The reflector end part fitting part formed in can be mentioned.

  The backlight unit of the present invention is provided behind the liquid crystal display panel to constitute a liquid crystal display device.

  According to the present invention, since the elastic holder is provided with the lead wire contact blocking means for blocking the contact of the lead wire with the end of the reflector, the lead wire contacts the end of the reflector and the covering material is damaged. Can be prevented.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(Embodiment 1)
1 to 3 show a backlight unit 10 for a liquid crystal display device according to Embodiment 1 of the present invention.

  The backlight unit 10 includes a lamp 11 and a reflector 12 provided so as to accommodate it.

  The lamp 11 is formed in an elongated cylindrical shape, and is composed of, for example, a cold cathode fluorescent tube or a hot cathode fluorescent tube.

  The reflector 12 is made of metal and is formed in a U-shape that is longer than the lamp 11 and that opens to the side.

  On the opening side of the reflector 12, a light guide plate 13 having an incident side surface disposed so as to face the opening is provided. The light guide plate 13 is made of a resin such as an acrylic resin, and is formed in a flat plate shape or a wedge shape. In addition, a reflective plate is provided on the rear surface of the light guide plate 13.

  Elastic holders 14 are attached to both ends of the lamp 11. Each elastic holder 14 is provided at the end of the reflector 12 so that a part thereof protrudes from the end of the reflector 12. And the lamp | ramp 11 is hold | maintained at the reflector 12 by the both elastic holders 14 provided in this way.

  Each elastic holder 14 is made of an elastic material such as rubber or urethane, and is formed in a rectangular parallelepiped block shape as shown in FIGS. Each elastic holder 14 is formed with a lead wire insertion hole 14 b on the upper surface side of the protruding portion 14 a from the end of the reflector 12. Further, a lead wire contact blocking wall 14c having a thick arc shape in cross section is integrally provided on the reflector 12 side at the periphery of the lead wire insertion hole 14b of each elastic holder 14.

  The backlight unit 10 includes a lamp connector 15 for supplying power that protrudes to the side of the unit. Extending from the lamp connector 15 are a large-diameter high-pressure lead wire 16 and a thin-diameter low-pressure lead wire 17 each having a core wire covered with a coating material. The high-voltage lead wire 16 extends from the lamp connector 15 to the outer side of the upper surface of the reflector 12, is bent in one direction and extends along the length direction so as to crawl on the upper surface of the reflector 12, and then the lead wire of the elastic holder 14 is inserted. The lamp 11 is inserted into the hole 14 b and electrically connected to one end of the lamp 11. The low-voltage lead wire 17 extends from the lamp connector 15 to the outside of the upper surface of the reflector 12 in parallel with the high-voltage lead wire 16 and bends to the other side opposite to the high-voltage lead wire 16 so as to crawl on the upper surface of the reflector 12. Is extended along the length direction and then inserted into the lead wire insertion hole 14 b of the elastic holder 14 and electrically connected to the other end of the lamp 11.

  Both of the high-voltage lead wire 16 and the low-voltage lead wire 17 are elastically deformed so as to press the lead wire contact blocking wall 14c erected on the elastic holder 14 so as to be inclined toward the reflector 12 and lead wire contact blocking wall. It is guided in the inner recess of 14c. The elastically deformed lead wire contact blocking wall 14 c is positioned so as to cover the end of the reflector 12, thereby preventing contact between the high voltage lead 16 or the low voltage lead 17 and the end of the reflector 12. To do.

  In order to prevent elastic deformation, the lead wire contact blocking wall 14c having a thick cross-section is preferably small in extent, but to prevent the lead wire from contacting the end of the reflector 12. Since it is preferable that the spread is large, it is preferable that the spread, that is, the center angle of the arc is 90 at the minimum and 180 ° at the maximum, as shown in FIGS. 5 (a) and 5 (b).

  According to the backlight unit 10 configured as described above, the elastic holder 14 is provided with the lead wire contact blocking wall 14c for blocking the contact of the high voltage lead wire 16 or the low voltage lead wire 17 with the end of the reflector 12. Therefore, it is possible to prevent the covering material from being damaged by the high-voltage lead wire 16 or the low-voltage lead wire 17 coming into contact with the end of the reflector 12. Accordingly, this prevents the core wire from being exposed due to damage to the covering material of the high-voltage lead wire 16 or the low-voltage lead wire 17, and prevents lighting failure due to contact with the reflector 12 and causing a short circuit. Can do.

  Further, an independent member such as an insulating tape for preventing the high-voltage lead wire 16 or the low-voltage lead wire 17 from contacting the end of the reflector 12 and a work process for providing the same are unnecessary. The cost increase that occurs when such an independent member is provided is prevented.

  This backlight unit 10 constitutes a liquid crystal display device D in combination with the liquid crystal display panel 20.

  FIG. 6 shows a liquid crystal display device D.

  The liquid crystal display device D has a configuration in which the backlight unit 10 is provided behind the liquid crystal display panel 20.

  The liquid crystal display panel 20 has a configuration in which a liquid crystal layer is provided between a pair of substrates 21 and a polarizing plate 22 is attached to the outside of each of the substrates 21. The liquid crystal display panel 20 is fixed to a frame-like chassis 23 that is a component of the backlight unit 10. A lead wire receiving groove 23a is formed in a portion of the chassis 23 fixed to the upper surface of the reflector 12, and the high voltage lead wire 16 and the low voltage lead wire 17 are accommodated therein. As described above, in the configuration in which the high voltage lead wire 16 and the low voltage lead wire 17 are accommodated in the lead wire accommodation groove 23 a formed in the chassis 23, the high voltage lead wire 16 and the low voltage lead wire are disposed in the vicinity of the elastic holder 14. 17 is sandwiched between the reflector 12 and the chassis 23 and may be damaged. In the backlight unit 10, the high-voltage lead wire 16 and the low-voltage lead wire 17 are respectively connected to the lead wire contact blocking wall 14c. Since it is guided by the inner concave portion, such damage to the high-voltage lead wire 16 or the low-voltage lead wire 17 is prevented.

  Between the liquid crystal display panel 20 and the light guide plate 13 of the backlight unit 10, an optical sheet 24 configured by sandwiching a lens sheet 24 a with a pair of diffusion sheets 24 b is provided.

  The liquid crystal display panel 20 and the backlight unit 10 integrated as described above are accommodated in the casing 25 to constitute the liquid crystal display device D.

(Embodiment 2)
7 and 8 show a backlight unit 10 according to Embodiment 2 of the present invention. In addition, the part of the same name as Embodiment 1 is shown with the same code | symbol as the thing of Embodiment 1. FIG.

  In this backlight unit 10, each elastic holder 14 is formed with a protruding portion 14d protruding in the shape of a track for cross-section competition at the periphery of the lead wire insertion hole 14b as shown in FIGS. 9 (a) and 9 (b). In addition, a notch formed in the lateral direction at the base end of the protrusion 14d on the reflector 12 side is configured in the reflector end fitting portion 14e. And each elastic holder 14 is provided in the reflector 12 so that an edge part may fit in the reflector edge part fitting part 14e.

  Both the high-voltage lead wire 16 and the low-voltage lead wire 17 are placed on the protrusion 14d of the elastic holder 14 fitted with the end portion from the reflector 12, and subsequently inserted into the lead wire insertion hole 14b. Therefore, the reflector end fitting portion 14e formed on the elastic holder 14 prevents the high-voltage lead wire 16 or the low-voltage lead wire 17 from contacting the end of the reflector 12.

  Other configurations are the same as those of the first embodiment.

  According to the backlight unit 10 configured as described above, the end of the reflector 12 is fitted to the reflector end fitting portion 14e formed on the elastic holder 14, and the high-voltage lead 16 or the low-voltage lead is fitted. Since the contact of the wire 17 with the end of the reflector 12 is blocked, it is possible to prevent the high-voltage lead wire 16 or the low-voltage lead wire 17 from coming into contact with the end of the reflector 12 to damage the coating material. it can. Accordingly, this prevents the core wire from being exposed due to damage to the covering material of the high-voltage lead wire 16 or the low-voltage lead wire 17, and prevents lighting failure due to contact with the reflector 12 and causing a short circuit. Can do.

  Other functions and effects and the configuration of the liquid crystal display device D are the same as those of the first embodiment.

(Other embodiments)
In the first embodiment, the lead wire contact blocking wall 14c and the reflector end fitting portion 14e in the second embodiment are configured as the lead wire contact blocking means, respectively. Any device can be used as long as it prevents contact between the lead wire 16 or the low-voltage lead wire 17 and the end of the reflector 12. For example, the high-voltage lead wire 16 or the low-voltage lead wire 17 You may comprise by the rigid body wall standingly arranged in the boundary part vicinity of the elastic holder 14 and the reflector 12 so that an edge part may be overcome.

  In the first and second embodiments, the high-voltage lead wire 16 and the low-voltage lead wire 17 are provided outside the upper surface of the reflector 12. However, the present invention is not limited to this, and the opening of the reflector 12 is not limited thereto. It may be provided on the outer side of the opposite side or on the outer side of the lower surface of the reflector 12.

  The present invention is useful for a backlight unit and a liquid crystal display device including the backlight unit.

3 is a partial plan view of the backlight unit according to Embodiment 1. FIG. It is II-II sectional drawing in FIG. FIG. 3 is a sectional view taken along line III-III in FIG. 1. It is (a) top view and (b) side view of the elastic holder of Embodiment 1. It is explanatory drawing for demonstrating the magnitude | size of the lead wire contact prevention wall of an elastic holder. FIG. 3 is a cross-sectional view corresponding to FIG. 2 of the liquid crystal display device of Embodiment 1. 6 is a partial plan view of a backlight unit according to Embodiment 2. FIG. It is VIII-VIII sectional drawing in FIG. It is the (a) top view and (b) side view of the elastic holder of Embodiment 2. It is sectional drawing corresponding to FIG. 6 of the conventional liquid crystal display device. It is a partial top view of the conventional backlight unit. It is XII-XII sectional drawing in FIG.

Explanation of symbols

D Liquid crystal display device 10 Backlight unit 11 Lamp 12 Reflector 14 Elastic holder 14a Protruding portion 14c Lead wire contact blocking wall 14e Reflector end fitting portion 16 High pressure lead wire 17 Low pressure lead wire 20 Liquid crystal display panel

Claims (4)

An elongated lamp,
An elongated and side-shaped U-shaped reflector provided to accommodate the lamp;
An elastic holder attached to one end of the lamp and provided at a part of the end of the reflector so as to protrude from the end of the reflector, and holding the lamp on the reflector;
A lead wire that is provided so as to extend along the length direction outside the reflector and that is inserted into a portion protruding from the end of the reflector of the elastic holder and is electrically connected to the lamp;
With
The elastic holder is provided with a lead wire contact blocking means for blocking the contact of the lead wire with the end of the reflector ,
The lead wire contact blocking means is erected on the elastic holder and has an inner recess formed in a cross-sectional arc shape along the outer periphery of the lead wire so as to be pressed by the lead wire to cover the end of the reflector. A backlight unit composed of a lead wire contact blocking wall elastically deformed . In the backlight unit according to claim 1,
The backlight unit in which the central angle of the cross-section arc-shaped lead wire contact prevention wall is 90 to 180 °. An elongated lamp,
An elongated and side-shaped U-shaped reflector provided to accommodate the lamp;
An elastic holder attached to one end of the lamp and provided at a part of the end of the reflector so as to protrude from the end of the reflector, and holding the lamp on the reflector;
The outer side of the reflector is provided so as to extend along the length direction. Subsequently, the elastic holder is inserted into a lead wire insertion hole of a portion protruding from the end of the reflector and electrically connected to the lamp. Lead wires,
With
The elastic holder is provided with a lead wire contact blocking means for blocking the contact of the lead wire with the end of the reflector,
The lead wire contact blocking means comprises a notch extending in the lateral direction formed at the proximal end portion on the reflector side of the protruding protrusion at the periphery of the lead wire insertion hole of the elastic holder , and the end portion of the reflector is fitted A backlight unit composed of a combined reflector end fitting portion. A liquid crystal display panel;
The backlight unit according to any one of claims 1 to 3, which is provided behind the liquid crystal display panel;
A liquid crystal display device.

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