JPH0729651A - Backlight device for display - Google Patents

Abstract

PURPOSE:To dispense with a lead wire guide, and prevent an increase in the number of parts due to a connector having lead wire guide function. CONSTITUTION:The fluorescent tube coupling section 14 of a connector 11 is coupled to the external surface of the electrode section 8a of a fluorescent tube 8, so as to be freely detachable, and a feed lead wire 10 inserted in the connector 11 is supported on a lead wire bearing section 15. The conductor 10b of the lead wire 10 is detachably coupled to a lead wire coupling section 16, thereby keeping the wire 10 and the tube 8 communicated with each other. According to this construction, the fluorescent tube 8 can be easily changed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a backlight device for a display device which is equipped with a tubular light source and is incorporated on the back side of a display panel in the display device.

[0002]

2. Description of the Related Art As shown in FIGS. 12 and 13, for example, in a liquid crystal display device 51, a liquid crystal panel 53 is provided in a window portion of a front cabinet 52, and the front cabinet 52 is provided.
A circuit board 55 is provided in the rear cabinet 54 that fits with the. A backlight device 56 is provided on the back side of the liquid crystal panel 53.

In the above-mentioned conventional backlight device 56, a plurality of fluorescent tubes 58, 58 as light sources are provided in parallel inside the backlight case 57. This fluorescent tube 5
As shown in FIG. 14, the lead wire type 8 is a lead wire type in which a lead wire 58a is pulled out from the end face.
Therefore, at the connecting portion 60 between the lead wire 58a of the fluorescent tube 58 and the lead wire 59 for supplying power to the fluorescent tube 58, the soldering or the crimping fitting shown in FIG. A crimp connection is made. Further, in the backlight device 56, in order to protect the connection portion 60 and the power supply lead wire 59, a lead wire guide which is formed of an insulating material and fits into the fluorescent tube 58 to fix the power supply lead wire 59. 61 is provided.

[0004]

However, it is necessary to replace the fluorescent tube 58 as the function thereof deteriorates. In this case, the back cabinet 54 is removed and the fluorescent tube 58 is removed.
, But the fluorescent tube 58 and the power supply lead wire 59 are replaced.
Since and are connected so that they cannot be fitted and removed as described above, the work cannot be performed easily. That is, complicated work such as solder removal and soldering work, cutting of the lead wire 58a and the power supply lead wire 59, and crimp connection work of both of them are required. Further, there is a problem that a tool for soldering or crimping connection is required.

Therefore, an object of the present invention is to provide a backlight device for a display device in which the fluorescent tube 58, that is, the tubular light source can be easily replaced.

[0006]

In order to solve the above-mentioned problems, a backlight device of a display device of the present invention includes a tubular light source, for example, a fluorescent tube, and a back surface of a display panel in a display device, for example, a liquid crystal display device. In the backlight device of the display device incorporated in the side, the tubular light source has an electrode portion for power feeding at the end, and a connector for connecting the electrode portion and a lead wire for power feeding is provided, and the connector is A fluorescent tube fitting portion that is removably fitted to the outer surface of the electrode portion, a lead wire support portion formed of a hole having a diameter corresponding to the outer diameter of the power supply lead wire, and a connector of the lead wire support portion rather than the lead wire support portion. The fluorescent tube fitting portion of the connector is fitted to the electrode portion of the tubular light source, and has a lead wire fitting portion that is formed in the depth direction and that fits the core wire of the power feeding lead wire in a releasable manner. , Inserted through the lead wire support The power supply leads are characterized by being supported, and the core wire and a fitted with power supply lead wire and the tubular light source to the lead wire engaging portion are electrically connected by a lead wire support part.

[0007]

According to the above construction, the connector is directly attached to the tubular light source, the tubular light source and the power supply lead wire are electrically connected to each other, and the tubular light source and the power supply lead wire and the connector are fitted and removed. Since it is flexible, the tubular light source does not require complicated work such as soldering for connecting the tubular light source and the power supply lead wire or crimp connection of the both with a crimp fitting so that they cannot be fitted and removed. Can be easily replaced. Further, the above-mentioned work does not require the soldering or crimping tool.

Further, since the connector also has the function of a lead wire guide, it is not necessary to provide a lead wire guide only for supporting the power supply lead wire. That is, since the lead wire guide is unnecessary while the connector is provided, the number of parts does not increase.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. As shown in FIGS. 4 and 5, the liquid crystal display device 1 as a display device includes a front cabinet 2
Liquid crystal panel 3 as a display panel on the window on the inner surface of
Is provided, and the circuit board 5 is provided on the inner surface of the rear cabinet 4 that fits with the front cabinet 2. At both sides of the back cabinet 4, lids 9 are provided detachably attached to close the openings formed at the both sides. A backlight device 6 is provided on the back side of the liquid crystal panel 3.

In the above-described backlight device 6, two fluorescent tubes 8 as tubular light sources are provided in parallel inside the backlight case 7 in the vertical direction. This fluorescent tube 8
1 has electrode portions 8a on the outer peripheral portions of both ends, as shown in FIG. The electrode portion 8a and the power supply lead wire 1
The connection with 0 is made by the connector 11 shown in FIG.

The connector 11 has a conductor portion 12 made of, for example, a metal inside, and an outer surface of the conductor portion 12 is
It is covered with an insulating coating layer 13 such as elastic rubber. The connector 11 has a fluorescent tube fitting portion 14 formed on one side and a lead wire support portion 15 and a lead wire fitting portion 16 formed on the other side.

The fluorescent tube fitting portion 14 has a length corresponding to the length of the electrode portion 8a of the fluorescent tube 8, and a cylindrical portion 14a having a diameter which allows the electrode portion 8a to be fitted from the outside. An engaging claw portion 14b which is formed at an end edge portion of the cylindrical portion 14a and engages with a rear edge portion of the electrode portion 8a. As shown in FIG. 3, a large number of notches 12a are formed in the conductor portion 12 of the fluorescent tube fitting portion 14, whereby the fluorescent tube fitting portion 14 has elasticity and is fitted with the fluorescent tube 8. It is possible.

The lead wire support portion 15 comprises a small hole formed in the axial center portion on the other side of the conductor portion 12. This small hole has an inner diameter corresponding to the insulating coating portion 10a of the power supply lead wire 10.

The lead wire fitting portion 16 is formed closer to the fluorescent tube fitting portion 14 than the lead wire supporting portion 15 and prevents the core wire 10b of the inserted power supply lead wire 10 from being easily pulled out. Moreover, it is designed to be clamped by its elastic force. That is, the lead wire fitting portion 16 is composed of an annular member having a cut portion as in the fluorescent tube fitting portion 14 or a pair of opposing sandwiching members, and as shown in FIG. When the core wire 10b is not inserted, it has a space having a diameter smaller than the diameter of the core wire 10b inward, and as shown in FIG.
It expands in accordance with the diameter of 0b and holds the core wire 10b. The end portion of the lead wire fitting portion 16 on the lead wire insertion side is flared to facilitate insertion of the core wire 10b.

In the above configuration, the backlight device 6
When assembling, for example, first, the connector 11 is attached to both ends of each fluorescent tube 8 and the fluorescent tube 8 is housed in the backlight case 7. In this operation, as shown in FIG. 6, the electrode portion 8a of the fluorescent tube 8 and the fluorescent tube fitting portion 14 of the connector 11 are opposed to each other, and the electrode portion 8a is connected to the fluorescent portion of the connector 11 as shown in FIG. When pushed into the tube fitting portion 14, the fluorescent tube fitting portion 14 expands. Then, when the electrode portion 8a is further pushed in, the engaging claw portion 14b of the fluorescent tube fitting portion 14 engages with the rear edge portion of the electrode portion 8a as shown in FIG. The part 14 is completely fitted. As a result, the electrode portion 8a of the fluorescent tube 8 and the conductor portion 12 of the connector 11 are connected.

Next, each power supply lead wire 10 is connected to each connector 11. In this operation, as shown in FIG. 9, after the insulating coating portion 10a is peeled off to expose the core wire 10b at the tip of the power supply lead wire 10, the lead wire support portion 15 of the connector 11 and the power supply lead wire are provided. The wire 10 is made to face each other, and the lead wire 10 for power supply is inserted into the lead wire support portion 15 and the lead wire fitting portion 16 at the back, as shown in FIG. When the core wire 10b at the tip of the power supply lead wire 10 is inserted into the lead wire fitting portion 16, the core wire 10b is pushed by the core wire 10b and the diameter of the lead wire fitting portion 16 is expanded, so that the core wire 10b.
When is completely inserted into the lead wire fitting portion 16, the core wire 10b is clamped by the elastic force of the lead wire fitting portion 16.
This completes the assembly of the backlight device 6. In this state, the power supply lead wire 10 is connected to the connector 11
It does not easily come off from the power supply lead wire 1
0 and the connector 11, that is, the fluorescent tube 8 are connected. The power supply lead wire 10 is supported by the lead wire support portion 15 of the connector 11, and the connection state between the core wire 10b and the lead wire fitting portion 16 is protected.

In the above assembly procedure, the procedure of fitting the fluorescent tube 8 to the connector 11 and the procedure of fitting the power supply lead wire 10 to the connector 11 may be reversed.

On the other hand, as shown in FIG. 5, when replacing the fluorescent tube 8 with the backlight device 6 incorporated in the liquid crystal display device 1, first, as shown in FIG.
Remove the lids 9 and 9 on both sides. Next, the lead wire fitting portion 16 pulls the power feed lead wire 10 in the pull-out direction with a force greater than that which holds the core wire 10b of the power feed lead wire 10 to pull out the power supply lead wires 10 on both sides. 10 to connector 11
Remove from 11. Next, after pulling out the fluorescent tube 8 from the backlight case 7, the connectors 11 are removed from both ends of the fluorescent tube 8. In this work, the engaging claw portion 14b of the fluorescent tube fitting portion 14 of the connector 11 is pushed outward and the engaging claw portion 14b and the rear edge of the electrode portion 8a of the fluorescent tube 8 are disengaged. By doing. After that, the connector 11 is attached to the unused fluorescent tube 8 and the procedure opposite to the above is performed to attach the fluorescent tube 8.

As described above, in the present backlight device 6, since the fluorescent tube 8 and the power supply lead wire 10 are connected by the connector 11 directly attached to the fluorescent tube 8,
Replacing the fluorescent tube 8 without performing a complicated work such as soldering for connecting the fluorescent tube 8 and the power supply lead wire 10 or crimping the two with a crimp fitting so that they cannot be fitted and removed. Can be done easily. Further, the above-mentioned work does not require the soldering or crimping tool.

Since the connector 11 also serves as the lead wire guide 61 shown in FIG. 14, the lead wire guide 61 only for supporting the power supply lead wire 10 is not required. That is, since the lead wire guide 61 is not required while the connector 11 is provided, the number of parts does not increase.

Further, the replacement work of the fluorescent tube 8 is performed without dividing the front cabinet 2 and the rear cabinet 4 and taking out the backlight device 6 as described above.
Can be removed and the fluorescent tube 8 is taken in and out. Therefore, the replacement work of the fluorescent tube 8 is further facilitated.

[0022]

As described above, in the backlight device of the display device of the present invention, the tubular light source has the electrode portion for power feeding at the end, and the connector for connecting the electrode portion and the lead wire for power feeding is provided. This connector includes a fluorescent tube fitting portion that is fitted into the outer surface of the electrode portion so as to be able to be fitted and removed, a lead wire support portion including a hole having a diameter corresponding to the outer diameter of the power supply lead wire, and the lead. The fluorescent tube fitting portion of the connector is formed in the depth direction of the connector with respect to the wire supporting portion, and has a lead wire fitting portion that is removably fitted to the core wire of the power supply lead wire. The power supply lead wire fitted to the electrode part and inserted through the lead wire support part is supported by the lead wire support part, and its core wire is fitted to the lead wire fitting part to supply the power supply lead wire. And the tubular light source are electrically connected.

With this, it is possible to perform soldering for connecting the tubular light source and the power supply lead wire, or to perform a crimping connection using a crimping metal fitting so that the both cannot be fitted and removed, and The tubular light source can be easily replaced without using a tool for soldering or crimping. Further, since the connector also has the function of a lead wire guide, there is an effect that the lead wire guide is unnecessary and the number of parts does not increase.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention, showing a connection state between a fluorescent tube and a power supply lead wire by a connector.

FIG. 2 is a vertical sectional view of the connector shown in FIG.

FIG. 3 is a perspective view showing a conductor portion included in the connector.

FIG. 4 is an exploded perspective view of a liquid crystal display device including a backlight device according to an embodiment of the present invention.

FIG. 5 is a vertical cross-sectional view of the liquid crystal display device.

FIG. 6 is a vertical cross-sectional view showing an initial state of fitting work between the connector shown in FIG. 1 and the fluorescent tube.

FIG. 7 is a vertical cross-sectional view showing a state in which the connector and the fluorescent tube are being fitted together.

FIG. 8 is a vertical cross-sectional view showing a completed state of fitting between the connector and the fluorescent tube.

9 is a vertical cross-sectional view showing an initial state of a fitting work between the power supply lead wire and the connector shown in FIG.

FIG. 10 is a vertical cross-sectional view showing a state where the power supply lead wire and the connector are in the middle of fitting.

FIG. 11 is an exploded perspective view showing an operation of replacing a fluorescent tube in the backlight device incorporated in the liquid crystal display device.

FIG. 12 is an exploded perspective view of a liquid crystal display device including a conventional backlight device.

FIG. 13 is a vertical cross-sectional view of the liquid crystal display device.

FIG. 14 is a vertical cross-sectional view showing a connection structure between a fluorescent tube and a power supply lead wire in a conventional backlight device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid crystal display device (display device) 3 Liquid crystal panel (display panel) 6 Backlight device 8 Fluorescent tube (tubular light source) 8a Electrode part 10 Power supply lead wire 10a Insulation coating part 10b Core wire 11 Connector 14 Fluorescent tube fitting part 15 Lead wire support 16 Lead wire fitting

Claims (1)

[Claims] 1. A backlight device for a display device, comprising a tubular light source, which is incorporated on the back side of a display panel in a display device, wherein the tubular light source has an electrode portion for supplying power to an end thereof, and A connector for connecting to the power supply lead wire is provided, and the connector has a fluorescent tube fitting portion that is removably fitted to the outer surface of the electrode portion, and a hole having a diameter corresponding to the outer diameter of the power supply lead wire. And a lead wire fitting portion that is formed in the depth direction of the connector with respect to the lead wire supporting portion and that fits in and out of the core wire of the power supply lead wire.
The fluorescent tube fitting portion of the connector is fitted to the electrode portion of the tubular light source, the power supply lead wire inserted through the lead wire support portion is supported by the lead wire support portion, and the core wire thereof is the lead wire. A backlight device for a display device, wherein the power supply lead wire and the tubular light source are electrically connected to each other by being fitted in a fitting portion.