JP2001076529A - Backlight power supply unit and backlight unit for liquid crystal display device using it - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a backlight unit for a liquid crystal display device having few number of part items and capable of reducing the assembling cost and member cost. SOLUTION: This backlight unit includes lamps 22, a base plate 36, the power supply of the lamps 22 provided on the base plate 36, and lamp connecting metal fittings 48 feeding electricity to the lamps 22 provided at the prescribed positions on the base plate 36. The power supply 42 and lamp connecting metal fittings 48 are connected together on the base plate 36. Notch sections matched with the layout intervals of the lamps 22 are provided on the base plate 36, and lamp holders 26 each having a recess matched with the cross sectional shape of the lamp 22 are connected to the notch sections.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a liquid crystal display device for displaying characters and images on a liquid crystal panel, and more particularly to a unit for supplying electricity to a backlight of the liquid crystal panel.

[0002]

2. Description of the Related Art In a liquid crystal display device, since liquid crystal itself does not emit light, characters and images are displayed on the surface of the liquid crystal panel by transmitting light from a backlight provided on the back side of the liquid crystal panel. For this backlight, a fluorescent tube that is brighter and has good color reproducibility is often used.

FIG. 1 shows the structure of a conventional backlight unit.
This will be described with reference to FIGS. Referring to FIG. 16, the backlight unit includes a reflection plate 20, a lamp 22, a lamp holder 80, a lighting curtain 30, a diffusion plate 28, and a frame 32. Lamp lead wires 76 are connected to both ends of the lamp 22 via rubber holders 74, respectively. The lamp lead 76 is connected to a connector 78. The lamp holder fixing screw 24 fixes the lamp holder 80 to the reflection plate 20. The frame fixing screw 34 joins the reflection plate 20 and the frame 32 with the diffusion plate 28 and the lighting curtain 30 interposed therebetween. Referring to FIG. 17, electricity to lamp 22 is supplied via a connector 78 by an inverter transformer (not shown) provided outside the backlight unit. Referring to FIG. 18, lamp holder 80 sandwiches rubber holder 74 provided on lamp 22. Thereby, the lamp 22 is fixed. The liquid crystal panel is placed on the frame 32 with its back surface facing the diffusion plate 28 side.

[0004]

However, in the conventional backlight unit, the number of rubber holders 74 and the number of lamp lead wires 76 are twice the number of lamps 22. Further, the number of contacts of the connector 78 is twice the number of lamps 22. When the number of parts is large, not only does the cost of members increase, but also a failure caused by a failure of a single component or a failure caused by a failure in assembly during assembly is induced. Further, since the number of parts is large, the assembling operation time is long and the assembling cost is high. Further, when replacing the lamp unit, it is necessary to remove the rubber holder 74, and the replacement operation time is long.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and has as its object to provide a backlight power supply unit and a backlight which have a small number of parts, are easy to assemble, and are easy to replace a lamp. To supply units.

[0006]

According to a first aspect of the present invention, there is provided a backlight power supply unit for supplying power to a backlight of a liquid crystal display device with a backlight, comprising: And a substrate having a back surface, a power supply provided on the main surface of the substrate and generating power for supplying to the backlight, and a power supply provided at a predetermined position on the main surface of the substrate and connected to the power supply and the substrate. Supply means for supplying power to the backlight.

According to the first aspect of the present invention, the substrate is provided with a power source for the backlight and a power supply means for the backlight, and these are connected on the substrate. As a result, a power source for the backlight can be provided inside the backlight unit, and a number of components such as lamp leads can be reduced.

According to a second aspect of the present invention, in addition to the configuration of the first aspect of the present invention, the substrate has a notch on the first side surface which matches the arrangement interval of the backlight. And the supply means is disposed in the notch.

According to the second aspect of the present invention, the power is supplied to the backlight by the supply means provided in the cutout provided in the substrate. Thus, power can be supplied from one substrate to a plurality of backlights arranged at predetermined intervals.

In the backlight power supply unit according to a third aspect of the present invention, in addition to the configuration of the second aspect, the power supply is provided on the main surface of the substrate between the cutout portions.

According to the third aspect of the present invention, the backlight power supply is provided on the substrate between the notches. Thus, a substrate with high integration efficiency can be realized in which the supply means is disposed in the notch on the substrate and the power supply is disposed between the notches.

According to a fourth aspect of the present invention, in addition to the configuration of the first aspect of the present invention, the power supply unit is provided on the main surface of the substrate and provided at both ends of the backlight. And holding means for holding the terminal and supplying electricity to the backlight.

According to the fourth aspect of the present invention, since the supply means supplies power by sandwiching the terminals at both ends of the backlight, the connection by the rubber holder and the lamp lead wire becomes unnecessary. As a result, a backlight unit that can reduce the number of parts and facilitate lamp replacement can be realized.

According to a fifth aspect of the present invention, in addition to the configuration of the first aspect, the backlight power supply unit further includes a positioning means for positioning the backlight.

According to the fifth aspect of the present invention, the positioning means can determine the position of the backlight and hold the backlight. Thereby, the backlight can be fixed at a predetermined position, and a backlight with uniform luminance can be realized.

According to a sixth aspect of the present invention, in addition to the configuration of the fifth aspect of the present invention, the positioning means has a concave portion that matches the cross-sectional shape of the end portion of the backlight. Including an engagement plate.

According to the sixth aspect of the present invention, since the engaging plate included in the positioning means includes a concave portion which matches the sectional shape of the end of the backlight, the end of the backlight is engaged with the engaging plate. Position. Thus, a backlight unit that can easily position the backlight can be realized.

According to a seventh aspect of the present invention, in the backlight power supply unit, in addition to the configuration of the sixth aspect of the present invention, the positioning means has a configuration in which the positioning means is fixed to an end portion of the backlight. It further includes a contact member that is large and contacts the engagement plate.

According to the seventh aspect of the present invention, the positioning means includes an abutting member at the end of the backlight that is larger than the cross-sectional shape of the end of the backlight. Since the engagement plate includes a concave portion that matches the cross-sectional shape of the backlight end, positioning can be performed by engaging the backlight end with the engagement plate. Further, the contact member at the end of the backlight is brought into contact with the end face of the engagement plate, whereby positioning in a direction perpendicular to the end face of the backlight (hereinafter, this direction is referred to as “longitudinal direction”) can be performed. Thus, a backlight unit that can easily position the backlight in two directions can be realized.

According to the backlight power supply unit of the invention described in claim 8, in addition to the configuration of the invention described in claim 5, the substrate has a notch on the first side surface that matches the arrangement interval of the backlight. The positioning means includes a contact member fixed to an end of the backlight and abutting around a notch on the back surface of the substrate.

According to the eighth aspect of the present invention, the positioning means includes a contact member that comes into contact with the periphery of the notch on the back surface of the substrate. The contact member fixed to the end portion of the backlight is brought into contact with the periphery of the notch to position the backlight in the longitudinal direction. Thus, a backlight unit that can easily position the backlight can be realized.

According to a ninth aspect of the present invention, in the backlight power supply unit, in addition to the configuration of the fifth aspect, the supply means is provided on the main surface of the substrate and provided at both ends of the backlight. And a positioning means for holding an end surface of the backlight against the holding means.

According to the ninth aspect of the present invention, the backlight can be positioned in the longitudinal direction by bringing the holding means for holding the terminals provided at both ends of the backlight into contact with the end face of the backlight. Thus, a backlight unit that can easily position the backlight without increasing the number of components can be realized.

According to a tenth aspect of the present invention, in addition to the configuration of the fifth aspect of the invention, the power supply unit is provided on the main surface of the substrate and provided at both ends of the backlight. The holding terminal for holding the terminal and supplying electricity to the backlight, the positioning means,
A tip portion provided at the tip of the terminal and wider than the terminal holding interval of the holding means is brought into contact with the holding means.

According to the tenth aspect of the present invention, the end provided at the front end of the backlight terminal is wider than the terminal holding interval of the holding means. Therefore, the backlight can be positioned in the longitudinal direction by contacting the distal end portion with the holding means. Thereby, a backlight unit that can easily position the backlight can be realized.

The backlight power supply unit according to the eleventh aspect of the present invention further includes a non-conductive covering means for covering the holding means in addition to the constitution of the fourth aspect of the invention.

According to the eleventh aspect, the covering means for covering the holding means is non-conductive, so that the holding means can be insulated from other conductive members. Further, adhesion of dust and the like to the holding means can be prevented. Thus, a backlight unit that can prevent an electrical failure beforehand can be realized.

According to a twelfth aspect of the present invention, in addition to the configuration of the eleventh aspect of the present invention, the non-conductive covering means has a groove at a smaller interval than the terminal tip.

According to the twelfth aspect of the present invention, when the covering means is covered, the tip of the terminal is brought into contact with the periphery of the groove which is narrower than the tip of the terminal provided on the covering means.
The backlight can be positioned in the longitudinal direction. Thus, a backlight unit that can easily position the backlight can be realized.

According to a thirteenth aspect of the present invention, in addition to the configuration of the second aspect, the supply means includes a conductive portion in the cutout portion.

According to the thirteenth aspect of the present invention, the backlight terminal can be soldered to the conductive portion provided in the cutout portion on the substrate which matches the arrangement interval of the backlight. Thus, a backlight unit that can reliably supply power to the backlight without using the holding means can be realized.

According to a fourteenth aspect of the present invention, there is provided a backlight unit for a liquid crystal display device, comprising: an outer frame; a reflecting means; a plurality of backlights provided between the outer frame and the reflecting means; A diffusion plate provided between the outer frame,
A backlight power supply unit according to any one of claims 1 to 13 provided in the reflection means, wherein the outer frame, the diffusion plate, and the reflection means are joined.

According to the fourteenth aspect, the backlight unit is formed by joining the outer frame, the diffusion plate, and the reflection means, and includes a power supply unit therein. The power supply unit includes a backlight power supply.
Thus, a backlight unit for a liquid crystal display device in which a number of components such as a rubber holder and a lamp lead wire can be reduced can be realized.

[0034]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a backlight unit for a liquid crystal display according to an embodiment of the present invention will be described with reference to the drawings. In the following description, the same portions are denoted by the same reference numerals. Also, the names and functions of such parts are the same. Therefore, repetition of detailed description of such portions will be appropriately omitted.

Referring to FIGS. 1 to 3, the backlight unit is provided with a reflection plate 20, a lamp 22 provided on the reflection plate 20, a power supply unit 37, and provided on the lamp 22. It includes a lighting curtain 30, a diffusion plate 28 provided on the lighting curtain 30, and a frame 32 provided on the diffusion plate 28. The power supply unit 37 includes an inverter board 36 and a GND board 38.
And a lamp holder 26.

Referring to FIGS. 2 and 3, the backlight unit is provided with a frame 32 and a diffusion plate 28 on the front side, and a reflection plate 20 on the back side. The liquid crystal panel has its back surface facing the diffusion plate 28 side,
It is placed on the frame 32.

The reflection plate 20 is made of metal or resin.
The light from the lamp 22 is reflected to increase the brightness of the illumination to the liquid crystal panel. In order to further increase the luminance, a high reflection sheet may be attached to the surface of the reflection plate 20 on the lamp 22 side.

A plurality of lamps 22 are provided at regular intervals in order to equalize the brightness of the light illuminating the liquid crystal panel.
The lamp 22 is not particularly limited as long as it is suitable for a direct type backlight of a liquid crystal panel, and is, for example, a hot cathode tube lamp or a cold cathode tube lamp.

The lamp holder 26 has a U-shaped groove that matches the cross-sectional shape of the lamp 22 with its tube end 46 (see FIG. 5). The installation interval of the U-shaped groove is determined by ramp 2
2 matches the installation interval. Also, the lamp holder 26
Are provided on the upper surface of the reflection plate 20 at positions of both ends of the lamp 22. An inverter board 36 is provided on one of the two lamp holders 26 and a GND board 3 is provided on the other.
8 are provided. The position of the notch of each substrate coincides with the position of the groove of the lamp holder 26.

The diffusion plate 28 equalizes the luminance of the light illuminating the liquid crystal panel. On the lamp 22 side of the diffusion plate 28, dot printing is performed or a dot-printed sheet is attached.

The lighting curtain 30 is a sheet for preventing the shadow of the lamp 22 from being reflected on the liquid crystal panel. For example, a milky white sheet is used for the lighting curtain 32.

The frame 32 is made of metal or resin and has a frame shape. The frame 32 is joined to the reflection plate 20 by frame fixing screws 34. Frame 3
2 keeps the rigidity of the entire backlight unit together with the reflection plate 20.

Referring to FIGS. 1 and 4, power supply unit 37 has the same shape as inverter board 36 having a cutout at the same position as the position of lamp 22 provided in each lamp holder 26. And a GND substrate 38 having: The screw 40 for fixing the substrate is formed by fixing the inverter substrate 36 and the GND substrate 38 to the corresponding lamp holders 2.
6 At this time, the inverter board 36 and GND
The substrate 38 is joined so that the corresponding notches face each other.

Referring to FIG. 5, a lamp connection fitting 48 is provided in a cutout portion of inverter board 36. The lamp connection fitting 48 clamps the lamp electrode portion at the contact portion 50. An inverter transformer 42 is provided between the notches of the inverter board 36. On the inverter board 36, the inverter transformer 42 and the lamp connection fitting 48 are connected. Also, the lamp holder 26
Is located at the same position as the lamp 22
Is provided with a U-shaped groove portion that matches the cross-sectional shape of the tube end portion 46. Therefore, the groove of the lamp holder 26 and the cutouts of the inverter board 36 and the GND board 38 are located at the same position. The lamp connection fitting 48 is manufactured by, for example, pressing a single metal plate.
The lamp connection fitting 48 has a gap for holding the lamp electrode portion 44 provided at the tube end 46 of the lamp 22. Further, the upper end of the gap is opened in a Y-shape to facilitate insertion into the gap to the lamp electrode portion 44. Further, a contact portion 50 of a lamp connection fitting 48 is provided at a tip of the lamp electrode portion 44.
A so-called carrage treatment is provided to provide a portion larger than the gap in.

Referring to FIG. 6, the GND board side has the same configuration as that of the inverter board side except that it does not have inverter transformer 42.

In the present embodiment, the shape of the notch provided in the inverter board 36 and the GND board 38 and the shape of the U-shaped groove provided in the lamp holder 26 have the same shape. It is. Its shape is lamp 2
The second tube end 46 has the same shape as the cross section of the tube end 46 or a shape larger than the cross section of the tube end 46 of the lamp 22.

The operation of the backlight unit having the above structure will be described. Referring to FIG. 2, electricity for driving inverter unit 42 is supplied to inverter unit 42 via connector 78.

Referring to FIG. 5, inverter transformer 42 provided on inverter board 36 transforms the supplied electric voltage to a voltage supplied to lamp 22. The transformed electricity flows to the lamp fitting 48 via the circuit on the inverter board 36. At this time, the inverter board 36
The voltage transformed by the inverter transformer 42 is applied between the lamp connection fitting 48 of the first embodiment and the lamp connection fitting 48 of the GND substrate 38.

Electricity for causing the lamp 22 to emit light is supplied from the contact portion 50 of the lamp connection fitting 48 to the electrode portion 44 of the lamp 22.

Referring to FIG. 6, as described above, lamp 2
The second GND board 38 has the same structure except that the inverter transformer 42 is not provided. Therefore, electricity also flows on the GND board 38 side via the contact portion 50 of the lamp connection fitting 48. In this manner, electricity having a predetermined voltage can be supplied to each of the lamps 22 from the inverter transformer 42 provided on the inverter board 36 via the lamp fittings.

In this case, the tube ends 44 at both ends of the lamp 22 are sandwiched by the contact portions 50 of the lamp fitting 48. The lamp connection fitting 48 is connected to the inverter board 36.
And GND substrate 38. The inverter board 36 and the GND board 38 are fixed to the lamp holder 26 by board fixing screws 40, respectively. The lamp holder 26 is provided with a screw 24 for fixing the lamp holder.
Thus, the reflection plate 20 and the frame 32 are joined by frame fixing screws 34. Therefore, the relative position of each lamp 22 with respect to the backlight unit is determined when the lamp electrode portion 44 is sandwiched by the lamp fittings 48.

Referring to FIG. 5, tube end 46 of lamp 22
And the diameter of the tip of the electrode portion of the lamp 22 are larger than the terminal clamping interval received by the contact portion 50 of the lamp connection fitting 48. Further, the distance from the tube end 46 to the contact portion 50 and the distance from the contact portion 50 to the tip of the electrode portion 44 are sufficiently shorter than the length of the lamp 22. Referring to FIG. 6, the opposite end of lamp 22 has the same structure. Therefore, the lamp 22 is positioned in the longitudinal direction. In other words, this is because the lamp 22 can move only to the position where the ends of the tube end 46 or the electrode portion 44 abut on the connection fitting 48 at both ends.

Further, referring to FIG.
6 is provided with a U-shaped groove that matches the cross-sectional shape of the tube end 46 of the lamp 22. The tube end 46 of the lamp 22 is engaged with the groove of the lamp holder 26, so that the lamp electrode 44 is sandwiched by the lamp fittings 48 to position the lamp 22.
The lamp 22 is more accurately positioned.

In some cases, the shape of the U-shaped groove provided in the lamp holder 26 is made larger than the cross section of the tube end 46 of the lamp 22 to position the lamp 22 only by the lamp fittings 48. . In this case,
In order to increase the holding force, the interval between the contact portions 50 needs to be sufficiently reduced. Even in such a case, the lamp 2
When the second electrode portion 44 is inserted, the electrode portion 44 of the lamp 22 can be easily inserted into the connection fitting 48 by the U-shaped guiding surface provided on the lamp connection fitting 48.

As described above, in the backlight unit according to the embodiment of the present invention, power is supplied from the inverter transformer provided therein to the lamp connection fitting via the board.
The lamp connection fitting supplies the supplied electricity to the lamp by sandwiching the lamp electrode portion. Further, since the lamp connection fitting sandwiches the lamp electrode portion, the lamp can be positioned. The lamp holder is provided with a groove that matches the cross-sectional shape of the end of the lamp tube, and the lamp can be engaged with the groove to accurately position the lamp. Also,
When the lamp holder is provided with a groove having a shape larger than the cross-sectional shape of the end portion of the lamp tube, only the lamp connection metal comes into contact with the lamp, and the lamp connection metal can accurately position the lamp.

As described above, the backlight unit according to the embodiment of the present invention can greatly reduce the number of parts, and can reduce the member cost and the assembly cost as compared with the conventional backlight unit. Further, since the positioning of the lamp can be easily performed, the assembly cost is reduced.
Further, when replacing the lamp, only the lamp that needs to be replaced can be easily replaced. In addition, when the lamp is brought into contact only with the lamp connection fitting, the contact portion can be minimized, so that the lamp can be prevented from being broken due to heat generation at the contact portion.

Hereinafter, a modification of the power supply unit of the backlight unit for a liquid crystal display device according to the embodiment of the present invention will be described.

<First Modification> Referring to FIG. 7, a first modification is provided at both ends of lamp 22 with lamp electrode portions 52.
Is not subjected to so-called carrage treatment (see the lamp electrode section 44 in FIG. 3).

Since such a lamp electrode portion 52 has the same structure as the electrode of the conventional lamp 22, it can be used in the backlight unit according to the present embodiment without any processing. In addition, such a lamp electrode portion 5
7, the tube end 46 of the lamp 22 is larger than the holding interval received by the contact portion 50 of the connection fitting 48 with reference to FIG. 7, and the tube end 46 on the opposite side has the same structure. Therefore, the lamp 22 is positioned in the longitudinal direction.
That is, the lamp 22 can move only to a position where the tube end 46 and the connection fitting 48 come into contact with each other.

<Second Modification> Referring to FIG. 8, in a second modification, the shape of the U-shaped groove of lamp holder 26 is changed from the shape of the notch of inverter board 36 and GND board 38. Also, rubber holders 54 corresponding to the shape were provided at both ends of the lamp 22. In the second modification, the length and position of the rubber holder 54 are determined so that the substrate-side end surface 56 of the rubber holder 54 is brought into contact with the lamp-side end surfaces of the inverter substrate 36 and the GND substrate 38.

According to the rubber holder 54, the outer shape of the rubber holder 54 matches the sectional shape of the U-shaped groove of the lamp holder 26. The end 56 of the rubber holder 54 is in contact with each end face of the inverter board 36 and the GND board 38. Therefore, the lamp 22
In two directions (longitudinal direction and direction perpendicular thereto) can be more accurately positioned.

<Third Modification> Referring to FIG. 9, in a third modification, rubber holders 60 are provided at both ends of lamp 22.

The rubber holder 60 is provided with a portion conforming to the cross-sectional shape of the U-shaped groove of the lamp holder 26 and a flange portion having a larger diameter. The length and position of the rubber holder 60 are determined so that the end surface of the flange portion on the substrate side is brought into contact with the end surface of the lamp holder 26 on the lamp side.
Further, in this modification, the lamp fitting 58 does not have the contact portion 50 that is sandwiched in conformity with the shape of the lamp electrode portion 44.

When such a rubber holder 60 is used, the smaller one of the shapes of the rubber holder 60 matches the cross-sectional shape of the U-shaped groove of the lamp holder 26. The flange of the rubber holder 60 is in contact with the end face of the lamp holder 26.
Therefore, the positioning of the lamp 22 in two directions (the longitudinal direction and the direction perpendicular thereto) can be performed more accurately. Further, since the shape of the lamp connection fitting 58 is simplified, member costs can be reduced.

<Fourth Modification> Referring to FIG.
In the modified example, the first modified example (see FIG. 7) is adopted for the lamp electrode section 52, and the second modified example (see FIG. 8) is adopted for the rubber holder 54.

According to such a lamp electrode portion 52, the conventional electrode of the lamp 22 can be used without processing.

Further, it is possible to accurately position the lamp 22 in two directions (a longitudinal direction and a direction perpendicular thereto).

<Fifth Modification> Referring to FIG.
The modification of the first embodiment employs the first modification (see FIG. 7) for the lamp electrode section 52, and employs the third modification (see FIG. 9) for the connection fitting 58 and the rubber holder 60. is there.

According to such a lamp electrode section 52, the conventional electrode of the lamp 22 can be used without processing.

Further, the lamp 22 can be accurately positioned in two directions (the longitudinal direction and the direction perpendicular thereto).
Further, since the shape of the lamp connection fitting 58 is simplified, member costs can be reduced.

<Sixth Modification> Referring to FIGS. 12 and 13, a sixth modification is a modification of the present embodiment (see FIG. 5) or the first modification (see FIG. 7). The connection fitting 48 is provided with a non-conductive cover 64. FIG. 12 shows a perspective view before the cover is mounted, and FIG. 13 shows a perspective view after the cover is mounted. The cover 64 is provided with a lock claw 66 that engages with the lower end of the lamp connection fitting 48. Further, the cover 64 is provided with a groove 65 corresponding to the diameter of the lamp electrode section on two side surfaces on which the lock claws 66 are not provided.

When the cover 64 is mounted on the lamp connecting fitting 48, the cover 64 and the connecting fitting 48 are engaged by the lock claws 66. When the so-called carrage process is performed, the lamp 22 is positioned by bringing the lamp electrode portion 44 into contact with the peripheral edge of the groove 65 of the cover 64. On the other hand, regardless of the presence or absence of the so-called carrage treatment, the cover 6
The lamp 22 is positioned by the end face of the lamp tube end 46 abutting on the peripheral edge of the groove 65 of No. 4.

By attaching such a cover 64 to the connection fitting 48, the lamp 22 is positioned in the longitudinal direction. Further, the lamp electrode portion 44 is firmly held between the connection fittings 48 by the attached cover 64. Further, the lamp electrode portion and the connection fitting 4 are attached by the attached cover 64.
In addition, electrical trouble can be avoided beforehand because no dust or the like adheres.

In this modification, the connection fitting 48
However, the simplified connection fitting 58 has been described.
(Third modification, see FIG. 9) can also be used. In this case, when the invitation surface 62 (see FIG. 9) of the connection fitting 58 is sandwiched by the cover 64, the lamp electrode section 44 can be more firmly held by the connection fitting 58.

<Seventh Modification> Referring to FIG.
Is a modification in which the lamp connection fitting 48 is not used in the present embodiment (see FIG. 5). Each of the inverter board 68 and the GND board 70 has a cutout 72 having a width corresponding to the size of the lamp electrode section 52. A solder connection 73 is provided around the notch 72. The position and size of the notch 72 are determined so that the lamp 22 is positioned at a predetermined position. The fixing of the lamp 22 is performed by soldering the lamp electrode portion 52 to the solder connection portion 72.

By connecting the electrodes by such soldering, the lamp 22 is positioned by engaging the tube end 46 thereof with the lamp holder 26. Further, the lamp 22 is positioned by soldering the lamp electrode portion 44 and the solder connection portion 73. In addition, since the electrode portions are connected by soldering, a connection that can be reliably conducted can be realized.

<Eighth Modification> Referring to FIG.
The third modification employs the third modification (see FIG. 9) for the rubber holder 60, and employs the seventh modification (see FIG. 14) for the connection of the electrodes.

Thus, the rubber holder 60 allows the lamp 22 to be easily positioned in two directions (a longitudinal direction and a direction perpendicular to the longitudinal direction). In addition, since the electrode portions are connected by soldering, a connection that can be reliably conducted can be realized.

As described above, the modified example according to the embodiment of the present invention can have the same operation and effect as those of the embodiment of the present invention.

The embodiments disclosed this time are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a backlight unit according to an embodiment of the present invention.

FIG. 2 is a perspective view of the backlight unit shown in FIG. 1 after assembly is completed.

FIG. 3 is a diagram showing a backlight unit 3-3 in FIG. 2;
It is sectional drawing.

FIG. 4 is a detailed perspective view of a power supply unit of the backlight unit shown in FIG.

FIG. 5 is a detailed perspective view of 5 shown in FIG. 4;

FIG. 6 is a detailed perspective view of 6 shown in FIG.

FIG. 7 is a detailed perspective view (part 1) showing a structure of a power supply portion.

FIG. 8 is a detailed perspective view (part 2) showing a structure of a power supply portion.

FIG. 9 is a detailed perspective view (part 3) showing a structure of a power supply portion.

FIG. 10 is a detailed perspective view (part 4) illustrating a structure of a power supply portion.

FIG. 11 is a detailed perspective view (part 5) showing a structure of a power supply portion.

FIG. 12 is a detailed perspective view (part 6) showing a structure of a power supply portion.

FIG. 13 is a detailed perspective view after the cover of FIG. 12 is attached.

FIG. 14 is a detailed perspective view (part 7) showing a structure of a power supply portion.

FIG. 15 is a detailed perspective view (No. 8) showing a structure of a power supply portion.

FIG. 16 is an exploded perspective view of a conventional backlight unit.

17 is a perspective view of the backlight unit shown in FIG. 16 after assembly is completed.

FIG. 18 shows one of the backlight units in FIG.
It is 8-18 sectional drawing.

[Explanation of symbols]

Reference Signs List 20 reflector, 22 lamp, 24 lamp holder fixing screw, 26 lamp holder, 28 diffusion plate, 30 lighting curtain, 32 frame, 34 frame fixing screw, 36 inverter substrate, 37 power supply unit, 38 GND substrate, 40 substrate fixing Screw, 42
Inverter transformer, 44 Lamp electrode part (with carrage treatment), 46 Lamp simple part, 48 Lamp fitting,
50 contact part, 52 lamp electrode part (no carrage treatment),
54 rubber holder, 56 rubber holder end face, 58 lamp connection fitting, 60 rubber holder (with flange), 62 lamp connection fitting 58 inviting surface, 64 lamp connection fitting 48 holding tool, 66 64 locking claw, 68 inverter board (modification) , 70 GND substrate (modification), 72 68, 7
0 substrate notch, 74 rubber holder (conventional), 76
Lamp lead wire, 78 connector, 80 lamp holder (conventional).

Claims (14)

[Claims] 1. A backlight power supply unit for supplying power to a backlight of a liquid crystal display device with a backlight, comprising: a substrate having a main surface and a back surface; and a substrate provided on the main surface of the substrate; A power source for generating power for supplying light to the backlight; and a power source for supplying power to the backlight, which is provided at a predetermined position on the main surface of the substrate and is connected to the power source by wiring on the substrate. Backlight power supply unit, comprising: 2. The substrate according to claim 1, wherein the substrate has a notch on a first side surface corresponding to an arrangement interval of the backlight, and the supply unit is arranged in the notch. Backlight power supply unit. 3. The backlight power supply unit according to claim 2, wherein the power supply is provided on the main surface of the substrate between the cutouts. 4. The supply means includes a holding means provided on the main surface of the substrate for holding the terminals provided at both ends of the backlight to supply electricity to the backlight. 2. The backlight power supply unit according to 1. 5. The backlight power supply unit according to claim 1, further comprising a positioning unit for positioning the backlight. 6. The backlight power supply unit according to claim 5, wherein said positioning means includes an engagement plate having a concave portion conforming to a sectional shape of an end of said backlight. 7. The positioning means further includes a contact member fixed to an end of the backlight, the contact member being larger than the cross-sectional shape and contacting the engagement plate.
The backlight power supply unit according to 1. 8. The substrate has a notch on a first side surface corresponding to an arrangement interval of the backlight, and the positioning means is fixed to an end of the backlight. The backlight power supply unit according to claim 5, further comprising a contact member that comes into contact with a periphery of the notch on the back surface. 9. The supply unit includes a supply unit provided on the main surface of the substrate, for supplying electricity to the backlight by sandwiching terminals provided at both ends of the backlight. The backlight power supply unit according to claim 5, wherein the means makes the end face of the backlight contact the holding means. 10. The supply means includes a holding means provided on the main surface of the substrate for holding terminals provided at both ends of the backlight to supply electricity to the backlight. The backlight power supply unit according to claim 5, wherein the means makes the holding means abut on a tip end provided at the tip of the terminal and wider than a terminal holding interval of the holding means. 11. The backlight power supply unit according to claim 4, further comprising a non-conductive covering means for covering the holding means. 12. The backlight power supply unit according to claim 11, wherein the non-conductive covering means has a groove having a smaller interval than the terminal tip. 13. The backlight power supply unit according to claim 2, wherein the supply unit includes a conductive part in the notch. 14. A backlight unit for a liquid crystal display device with a backlight, comprising: an outer frame; a reflector; a plurality of backlights provided between the outer frame and the reflector; 14. A light diffusing plate provided between the light and the outer frame, and the backlight power supply unit according to claim 1, provided on the reflection means, wherein the outer frame and the diffuser are provided. A plate and the reflection means are joined,
Backlight unit for liquid crystal display.