JP4566174B2 - Lamp holder and backlight device - Google Patents

Description

  The present invention relates to a lamp holder for supporting a plurality of fluorescent lamps driven by an inverter circuit, and a backlight device in which the fluorescent lamp is supported by the lamp holder.

  Backlights used in liquid crystal televisions and the like are becoming larger with the increase in the screen size of liquid crystal televisions. In addition, demands for lower power consumption, lower prices, and the like are becoming stronger for backlights. To meet these demands, U-shaped and U-shaped curved tube fluorescent lamps are used in place of conventional straight tube fluorescent lamps to reduce the number of fluorescent lamp tubes and the number of inverters. The configuration that can reduce the amount is applied.

  In the case of a backlight using a curved tube fluorescent lamp, the fluorescent lamp becomes longer with an increase in size, and the applied voltage increases. At this time, a leakage current is likely to occur near the high voltage portion due to the stray capacitance between the fluorescent lamp and the housing. As a result, a difference in luminance occurs in the direction of the tube axis of the fluorescent lamp, which is a factor in uneven luminance of the backlight itself.

  Further, as the voltage to the fluorescent lamp increases, the power of the inverter that drives the fluorescent lamp increases, and the amount of heat generated increases. Since the inverter is normally disposed on the back side of the electrode portion of the fluorescent lamp, a temperature difference is likely to occur in the tube axis direction of the fluorescent lamp. Such a temperature difference also causes a luminance difference in the tube axis direction of the fluorescent lamp.

For example, Patent Document 1 discloses a backlight that can illuminate with uniform luminance even when the luminance of the backlight is uneven.
According to Patent Document 1, the electrode side and the bent portion side of the curved tube fluorescent lamp are alternately arranged, and the inverter is arranged on the back side of the reflection case (housing) on the electrode feeding side of each fluorescent lamp. Thus, the difference in tube wall temperature between the lamp tube axis direction and the board surface direction is reduced, and the brightness difference on the board surface is reduced.

Further, in Patent Document 2, a spacer tube with a slit is fitted and held in a folded portion of a U-shaped fluorescent lamp, and two opposing positions close to both electrodes of the fluorescent lamp are simultaneously formed by an integrally formed lamp clip. By holding, the fluorescent lamp can be held without generating stress in the folded portion.
Japanese Patent Laying-Open No. 2005-268028 JP 2004-342335 A

Patent Document 2 discloses a configuration in which U-shaped fluorescent lamps are arranged in the same direction. In this configuration, since the directions of the fluorescent lamps are the same, the luminance unevenness of the backlight as described above is likely to occur.
Therefore, as shown in Patent Document 1, it is conceivable to reduce uneven brightness of the backlight by alternately arranging the electrode side and the bent portion side of the fluorescent lamp.

  In the backlight device, an opening is provided in the casing in order to connect the electrode portion of the fluorescent lamp housed inside the casing and the inverter provided on the back side of the casing. At this time, if the U-shaped fluorescent lamps are alternately arranged as described above, the electrode portions of the fluorescent lamps are alternately arranged, and the openings for wiring as described above are also aligned with the electrode positions. Are alternately arranged.

In this case, dust or foreign matter that has entered from the outside of the housing will affect not only the electrode portion of the fluorescent tube but also the bent portions of other adjacent fluorescent tubes. There arises a problem that the diffusion range of the foreign matter is expanded.
Patent Document 1 does not disclose any technical idea for preventing such contamination due to dust or foreign matter.

Further, in the backlight, it is necessary to arrange the fluorescent lamps at a predetermined interval with high accuracy. In particular, on the electrode part side connected to the inverter, a configuration is required so that the positioning can be performed accurately and easily.
In other words, in a backlight in which the electrode side and the bent part side of the fluorescent lamp are alternately arranged to reduce the overall luminance unevenness, contamination of the alternately arranged electrode part and the bent part is minimized. In addition, at this time, a configuration capable of easily ensuring the alignment accuracy of the fluorescent tubes is required.

  The present invention has been made in view of the above circumstances, and in a backlight device in which the electrode portion side and the bent portion side of the fluorescent lamp are alternately arranged, dust and foreign matter from the outside of the housing that houses the fluorescent lamp are removed. An object of the present invention is to provide a lamp holder capable of reliably preventing contamination against contamination and easily ensuring the alignment accuracy of fluorescent lamps, and a backlight device including the lamp holder. .

  In order to solve the above problems, the first technical means of the present invention is composed of two or more straight portions, an electrode portion that is electrically connected to the lamp driving circuit, and a bent portion that connects the straight portions. A lamp holder for storing an electrode portion and a bent portion with respect to the lamp unit, a first notch for storing the electrode portion, and a second adjacently provided for storing the bent portion. And a shielding means for spatially shielding the bent portion from the electrode portion between each second notch and the adjacent first notch. It is characterized by.

  The second technical means is characterized in that, in the first technical means, the same number (two) of first cutouts and second cutouts are provided alternately in the lamp arrangement direction. It is.

  A third technical means is characterized in that, in the first or second technical means, the bent portion is composed of two fluorescent tube electrodes and a lead wire connecting the two electrodes. Is.

  According to a fourth technical means, in the first or second technical means, the lamp unit forms a substantially U-shape by connecting a U-shaped tube, a U-shaped tube or two linear fluorescent tubes with a lead wire. It is characterized by being one of the assemblies. The lamp holder according to claim 1 or 2.

  A fifth technical means includes a plurality of lamp units each including two or more linear portions, an electrode portion electrically connected to the lamp driving circuit, a bent portion connecting the linear portions, the electrode portion, In a backlight device including a lamp holder that stores a bent portion, a lamp unit, and a housing that stores the lamp holder, the lamp unit has a straight portion parallel to each other, and an electrode portion and a bent portion. Are arranged in the casing alternately in the lamp arrangement direction, and a plurality of lamp holders are provided adjacent to each other to house the first notch for housing the electrode portion and the bent portion. In a state in which the bent portion is spatially shielded from the electrode portion by the shielding means between each second notch and the adjacent first notch. That it was installed It is obtained by the butterfly.

  According to a sixth technical means, in the fifth technical means, the housing includes a through-hole through which a connecting means for connecting the electrode portion and the lamp driving circuit is provided on a surface to which the lamp holder is attached. It is a thing.

  According to a seventh technical means, in the fifth or sixth technical means, the lamp holders are arranged in parallel with each other in the lamp arrangement direction on both end sides of the casing by arranging the linear portions in parallel. It is characterized by being attached in a pair so as to accommodate the bent portion.

  The eighth technical means in any one of the fifth to seventh technical means, in a state where the lamp holder is attached to the housing, a space for accommodating the individual electrode portions, and a space for accommodating the bent portion, It is characterized by being configured to form a closed space excluding the notches.

  The ninth technical means is that, in any one of the fifth to eighth technical means, the bent portion is composed of two fluorescent tube electrodes and a lead wire connecting the two electrodes. It is characterized by.

  According to a tenth technical means, in any one of the fifth to eighth technical means, the lamp unit is formed by connecting a U-shaped tube, a U-shaped tube or two linear fluorescent tubes with a lead wire. It is characterized in that it is one of the assemblies that form a character.

  According to the present invention, a plurality of U-tubes, U-tubes, and two fluorescent tubes connected in series to form a U-shape, a plurality of high-voltage side electrodes are arranged alternately so that the luminance distribution Even in a backlight that makes it possible to make uniform the dust and dirt that tends to enter from the hole of the backlight chassis provided near one electrode part, is transmitted to the bent part adjacent to the electrode part Therefore, it is possible to suppress the contamination of the backlight as much as possible.

  Further, according to the present invention, the holding member that holds the fluorescent lamp is accurately and reliably positioned by the ribs. Therefore, the fluorescent lamp can be accurately arranged at a predetermined interval by the lamp holder and the holding member. it can.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Note that components having the same function are denoted by the same reference symbols throughout the drawings for describing the embodiments, and the repetitive description thereof will be omitted.

FIG. 1 is a cross-sectional view showing a configuration example of a liquid crystal display device using a backlight device according to the present invention. The liquid crystal display device includes a liquid crystal panel 1 and a backlight device 2 as main components. The liquid crystal panel 1 feeds the video signal subjected to the video signal processing as a predetermined gradation voltage for each pixel in accordance with the clock signal of the liquid crystal panel 1, and sequentially scans the screen to display the video corresponding to the video signal. indicate.
The backlight device 2 irradiates light from the back side of the liquid crystal panel 1. As the light source of the backlight device 2, for example, a cold cathode fluorescent lamp (CCFL) is used.

  The backlight device 2 includes a plurality of fluorescent lamps 21 for supplying light to the liquid crystal panel 1, and a reflection sheet or reflector (hereinafter referred to as “reflecting sheet”) for effectively irradiating the liquid crystal panel 1 with the light emitted from each fluorescent lamp 21. And 22 (represented by a reflective sheet) and a housing (chassis) 23 for storing them.

  An inverter circuit board (lamp drive circuit) 28 on which an inverter circuit is mounted is disposed on the back side of the housing 23. The inverter circuit board 28 is provided with an inverter transformer 29 that is a booster circuit that supplies power to each fluorescent lamp 21. As the inverter transformer 29, for example, there is a winding type that transforms based on the winding ratio of the coils by the electromagnetic induction effect of two coils.

  As the inverter circuit, for example, a separately excited inverter can be applied. In general, a separately excited inverter is provided with an oscillation circuit on the primary side and converts it into an alternating current having the same frequency as the drive frequency of the oscillation circuit. This separately excited inverter is used to drive the winding-type inverter transformer 29 as described above. By using it, it is possible to realize a small-sized and highly efficient inverter that exceeds the piezoelectric type inverter while being a winding type.

  The liquid crystal panel 1 is composed of two glass substrates with polarizing plates having a crossed Nicols relationship with a liquid crystal layer interposed therebetween, and is fixedly held by two frames 3 and 4. The frames 3 and 4 have a structure bent in a substantially L-shaped cross section so as to cover the entire backlight device 2.

The fluorescent lamp 21 constituting the backlight device 2 has a straight tube shape, and is arranged so that straight portions thereof are parallel to each other.
As the light source of the backlight, a straight tube fluorescent lamp 21 is used, and the electrodes on one side of the two fluorescent lamps are connected to each other so that the same drive as the U-shaped tube is performed. In the present specification, a set in which the two fluorescent lamps are connected is referred to as a pseudo U-shaped tube. A configuration example of the pseudo U-shaped tube and a specific example of the driving method will be described later.
Further, not only the pseudo U-shaped tube as described above but also a normal U-shaped tube can be applied to the configuration of the backlight of the present invention.

The backlight device 2 is further provided with various optical members according to the optical performance required for the liquid crystal display device. For example, a diffusion plate 24 that diffuses light from the fluorescent lamp 21, a diffusion sheet 25 that controls light distribution characteristics, a prism sheet 26 that condenses light in a specific direction, or selectively transmits polarization of light in a specific direction. A reflective polarizing plate 27 that reflects and improves the degree of polarization is appropriately disposed.
Moreover, the shape of the reflection sheet 22 may be, for example, a planar shape as shown in FIG.

  A high-voltage AC voltage is supplied to the electrodes of the fluorescent lamp 21 from the inverter transformer 29 of the inverter circuit board 28 disposed substantially parallel to the back surface of the backlight device 2. Mercury in the fluorescent lamp 21 is excited by the high-voltage AC voltage, and light in the vicinity of ultraviolet rays is emitted by the energy level. The ultraviolet light emits red, blue, and green phosphors provided on the tube wall of the fluorescent lamp 21, and these emission colors are mixed to form white light.

  The white light thus emitted is acted on by the various optical members described above to illuminate the liquid crystal panel 1 from the back side of the liquid crystal panel 1. In each pixel of the liquid crystal panel 1, the light transmittance of each pixel is controlled according to a predetermined gradation voltage, and an image is displayed on the screen.

2 is a diagram for explaining an example of the arrangement and driving method of the fluorescent lamp of the backlight device, and FIG. 2A is a diagram for explaining an arrangement of the fluorescent lamp and a connection configuration example of the inverter transformer. (B) is a figure explaining the drive method of the fluorescent lamp at this time.
In FIG. 2, 30 is a socket (connecting means) installed on the inverter circuit board, 100 is a pseudo U-shaped tube composed of two straight tube fluorescent lamps 21, 101a and 101b are electrodes of the fluorescent lamp 21, 102 is a lead wire connected to the electrode 101a, 103 is a connector (connecting means), and 104 is a lead wire interconnecting the electrode 101b. In the pseudo U-shaped tube, a portion including the lead wire 104 and the two electrodes 101b connected to the lead wire 104 is specified as a bent portion for convenience.

In the backlight of the present embodiment, a pseudo U-tube configuration in which electrodes on one side of each of the two straight tube fluorescent lamps 21 are connected by lead wires can be adopted. By using the pseudo U-shaped tube configuration, it is easier to handle than the conventional U-shaped tube, and the advantage that the backlight can be easily assembled is obtained. Further, unlike the U-shaped tube, the configuration using the pseudo U-shaped tube also has an advantage that it can easily cope with a change in use of the pitch of the fluorescent lamp. The pseudo U-shaped tube can be lit with the same number of inverters as the conventional U-shaped tube.
Further, in the embodiment according to the present invention, not only the pseudo U-shaped tube as described above but also a fluorescent lamp having a normal U-shaped tube configuration can be applied. Hereinafter, a configuration example using a pseudo U-shaped tube will be described. In the case of a normal U-shaped tube, there is no pseudo U-shaped lead wire connecting the electrodes on one side, and the following configuration may be replaced with a single continuous U-shaped fluorescent tube.

In FIG. 2, a plurality of pseudo U-shaped tubes 100 are arranged in parallel. In each pseudo U-shaped tube 100, the electrodes 101 b on one side of the two straight tube fluorescent lamps 21 are connected by lead wires 104. The other electrode 101 a of each fluorescent lamp 21 is connected to the connector 103 via the lead wire 102. The connector 103 is connected to the socket 30 of the inverter circuit board 28.
A pair of inverter circuit boards 28 are provided on the left and right sides, and are arranged near the electrodes at both ends of the fluorescent lamp 21 on the back side of the housing 23. Here, the electrode 101a on the side connected to the inverter circuit board 28 is the drive side, and the electrode 101b on the side connected to each other by the lead wire 104 is the intermediate portion side.

  In this example, the high-voltage AC voltage is supplied from the inverter transformer 29 on the inverter circuit board 28 to the electrode 101 a of one of the fluorescent lamps 21 among the electrodes 101 a on the driving side of the two fluorescent lamps 21. In addition, among the driving-side electrodes 101a, the electrode 101a of the other fluorescent lamp 21 is grounded. Therefore, the pseudo U-shaped tube 100 is driven by one side by the single inverter transformer 29 and lights up.

The plurality of pseudo U-shaped tubes 100 are arranged such that the drive-side electrodes 101a and the intermediate-side electrodes 101b are alternately arranged. That is, in a backlight device in which a plurality of pseudo U-shaped tubes are arranged, adjacent pseudo U-shaped tubes are arranged so that the directions of the electrodes connecting the connector 103 are different.
As a result, the drive-side electrodes 101a connected to the inverter transformer 29 are alternately arranged on the left and right for each pseudo-U-tube unit, and luminance unevenness occurring in the tube axis direction between the high-voltage side and the ground side is compensated. Thus, luminance unevenness as a backlight can be reduced.

  FIG. 3 is a diagram for explaining another example of the arrangement and driving method of the fluorescent lamp of the backlight device. FIG. 3A is a diagram for explaining an arrangement of the fluorescent lamp and an example of a connection configuration of the inverter transformer. FIG. 3B is a diagram for explaining a driving method of the fluorescent lamp at this time.

The configuration of FIG. 3 is such that the pseudo U-tube 100 is driven on both sides by two inverter transformers, and the other configuration is the same as that of FIG.
In other words, in this example, the inverter transformer 29 is connected to both of the driving-side electrodes 101a of the two fluorescent lamps 21, and a high-voltage AC voltage whose phases are inverted from each other is supplied to both the electrodes 101a. Thus, the pseudo U-shaped tube 100 is driven on both sides by the two inverter transformers 29 and lights up.

  The plurality of pseudo U-tubes 100 are arranged such that the drive-side electrodes 101a and the intermediate-side electrodes 101b are alternately arranged, so that the drive-side electrodes 101a connected to the inverter transformer 29 are arranged. However, the pseudo U-shaped tubes 100 are alternately arranged on the left and right sides, so that the luminance unevenness occurring in the tube axis direction between the drive side and the intermediate portion side is compensated, and the luminance unevenness as the backlight is reduced. be able to.

  FIG. 4 is a diagram for explaining another example of the arrangement and driving method of the fluorescent lamp of the backlight device, and FIG. 4A is a diagram for explaining the arrangement of the fluorescent lamp and the connection configuration example of the inverter transformer. FIG. 4B is a diagram for explaining the driving method of the fluorescent lamp at this time.

  The configuration in FIG. 4 is such that the pseudo U-shaped tube 100 is driven on both sides by one inverter transformer, and the other configurations are the same as those in FIG. In other words, in this example, of the two fluorescent lamps 21, the two electrodes 101a connected to the connector 103 are electrically connected to the inverter circuit board 28 by connecting the connector 103 and the socket 30, respectively. These electrodes 101a are supplied from the inverter transformer 28 with a high-voltage AC voltage whose phases are mutually inverted. As a result, the pseudo U-shaped tube 100 is floated and lit by the inverter transformer 29 that supplies power in the above form.

  In the pseudo U-shaped tube 100, the remaining electrodes 101b of the two fluorescent lamps 21 are connected to each other via lead wires. A plurality of pseudo U-shaped tubes 100 are arranged in a housing (backlight chassis) 23, and each pseudo U-shaped tube 100 has an arrangement position of the electrodes 101a and 101b in the arrangement direction of the fluorescent lamps. In contrast, each set is alternately reversed and attached. For this reason, the drive-side electrodes 101a connected to the inverter transformer 29 are alternately arranged on the left and right sides for each pseudo U-shaped tube 100, and the luminance unevenness generated in the tube axis direction is compensated for as a backlight. Brightness unevenness can be reduced.

FIG. 5 is a diagram showing a configuration example of a holding member attached to the fluorescent lamp in the backlight device according to the present invention.
First and second holding members 201 and 202 are attached to the electrode ends of the respective fluorescent lamps 21 of the pseudo U-shaped tube 100. For each of the holding members 201 and 202, a member having flexibility and insulation, such as silicon rubber, is preferably used, but the material is not limited.

  In the pseudo U-shaped tube 100, the first holding member 201 is attached to the electrode end portion on the driving side to which the connector 103 is connected. The first holding member 201 has a structure that individually covers the drive side electrode of each fluorescent lamp 21. The lead wire 102 connected to the electrode is drawn out from the lower surface side of the first holding member 201 molded into an L shape. After the pseudo U-shaped tube 100 is created, the first holding member 201 has a space for accommodating the electrode and the lead wire 102, and an electrode and a lead in the space so that the first holding member 201 can be mounted. A slit that can accommodate the lead wire 102 is provided.

On the other hand, in the pseudo U-shaped tube 100, the second holding member 202 is attached to the electrode end on the intermediate side where the electrodes are connected. The second holding member 202 is configured to integrally accommodate the electrodes of the two fluorescent lamps 21 and the lead wires. In the case of a normal U-shaped tube instead of a pseudo U-shaped tube, the bent portion of the fluorescent lamp is accommodated in the second holding member 202.
Also in the second holding member 202, silicon rubber or the like can be suitably used. The second holding member 202 is also provided with a space for accommodating electrodes and lead wires and a slit.

  These holding members 201 and 202 can accurately position each fluorescent lamp 21 when the fluorescent lamp 21 is set in a lamp holder which will be described later. In addition, the holding members 201 and 202 achieve insulation reliability and a protection function for the electrode portion.

FIG. 6 is a view showing another configuration example of the holding member used for holding the fluorescent lamp in the backlight device according to the present invention.
Of the holding members 201 and 202 as shown in FIG. 5, a configuration in which only the first holding member 201 is attached to the pseudo U-shaped tube 100 as shown in FIG. 6 may be adopted. The intermediate side connected by the lead wire 104 is at a low pressure relative to the high-voltage drive side, and is almost at ground potential in the case of double-side drive, so there is a risk of leakage even if the second holding member 202 is reduced. There is relatively little sex. In the configuration of FIG. 6, the cost can be reduced as compared with FIG.

FIG. 7 is a view for explaining a configuration example of a lamp holder used in the backlight device of the present invention, in which 5 is a lamp holder, 51 is a notch (particularly, 51a, 51b, 51e are first cutouts). The notches 51c and 51d are referred to as second notches.) 52 is a rib (shielding means) provided inside the lamp holder.
The pseudo U-shaped tube 100 equipped with the holding members 201 and 202 as shown in FIG. 5 or 6 is attached to the lamp holder 5 as shown in FIG. The lamp holder 5 accommodates the holding members 201 and 202. At this time, a rib 52 for positioning the holding members 201 and 202 and preventing contamination of the fluorescent lamp 21 is provided inside the lamp holder 5.

That is, the rib 52 is placed in the lamp holder 5 so as to conform to the shape of the holding members 201 and 202 and so that the fluorescent lamps 21 are accurately arranged at a predetermined pitch when the holding members 201 and 202 are accommodated. Is provided. Each rib 52 is provided at a position to support the holding members 201 and 202 from both sides. Incidentally, only the first holding member 201 is supported from both sides by the ribs 5 2, by positioning the predetermined pitch in the first holding member 201 side, between the second holding member 20 2 and the rib 52 The structure which a gap | interval produces may be sufficient.

  In the example of FIG. 7, the first holding members 201 are accommodated in the space A between the ribs 52a and 52b and the space B between the ribs 52c and 52d, respectively. Further, the second holding member 202 is accommodated in the space C between the ribs 52d and 52e. In the case of the configuration as shown in FIG. 6 in which the second holding member 202 is not used, the space-side electrode accommodates the intermediate U-side electrode and the lead wire 104 as they are. The rib 52e is further used as a rib that accommodates the next first holding member 201.

Moreover, when the arrangement | positioning position of the said rib is specified from the positional relationship with various notches, it demonstrates as follows. That is, the rib 52d indicates the vicinity of the first notch 51b for supporting the vicinity of the electrode portion to which power is supplied to the two fluorescent lamps and the vicinity of the electrode (curved portion) connecting the two fluorescent lamps to each other. It is located between the second notch 5 1 c and is provided so as to prevent dust from entering from the space A or B. The rib 52e is similarly provided between the second cutout 51d and the first cutout 5 1 e. With this configuration, dust mixed into the space C in which the vicinity of the bent portion supported by the second cutouts 51c and 51d is accommodated, the lamp holder is placed in a predetermined position (the fluorescent tube electrode portion and the bent portion) in the housing. This is prevented by being attached at a position where the part is stored.

  Further, when a normal U-shaped tube is used instead of the pseudo U-shaped tube, the bent portion of the U-shaped tube is formed in the space C together with the second holding member 202 or without using the second holding member 202. Housed as is. That is, the ribs 52 of the lamp holder 5 are disposed on both sides of the electrode portions on one side of each of the two fluorescent lamps of the pseudo U-shaped tube or on both sides of the electrode portions of the U-shaped tube. It is arranged on both sides of the lead wire connecting the other electrodes of the tube or the bent portion of the U tube. And it has the structure which provided the area | region which arrange | positions a rib on both sides of said electrode part, and the area | region which arrange | positions a rib on both sides of a lead wire or a bending part by turns in the arrangement direction of a fluorescent lamp.

8-10 is a figure for demonstrating the procedure which mounts a fluorescent tube in the housing | casing of a backlight. In each figure, only the fixing structure on one side of the fluorescent tube 21 is shown, but the other side also has the same structure.
As described above, the holding members 201 and 202 or only the holding member 201 is attached to the electrode end portion of the pseudo U-shaped tube 100. Here, as shown in FIG. 5, only the first holding member 201 is attached to each electrode end.

  Then, as shown in FIG. 8, the holding members 201 and 202 are installed at predetermined positions of the housing 23, and the connector 103 connected to the driving side of the pseudo U-tube 100 through the opening 231 is connected to the housing 23. Take it out to the back side. In the portion corresponding to the intermediate side connected by the lead wire 104, the opening of the housing 23 is not provided because it is not necessary to take out the wiring on the back side of the housing 23.

  FIG. 9 is a view showing a state in which the lamp holder 5 is attached to a predetermined position. The lamp holder 5 is attached to the housing 23 with a predetermined structure inside the housing 23. For example, the lamp holder 5 is fitted to a receiving member (not shown) of a lamp holder fixed to the housing 23, so that the lamp 23 is integrally fixed and held on the housing 23.

When the lamp holder 5 is attached at a predetermined position, the holding member 201 is accommodated in the space in the lamp holder 5 defined by the ribs 52 as described above. Each fluorescent tube 21 passes through a notch 51 provided in the lamp holder 5.
Here, since the holding member 201 is accurately and reliably positioned by the ribs 52, the fluorescent lamps 21 can be accurately arranged at predetermined intervals by the lamp holder 5 and the holding member 201 of this configuration.

As shown in FIG. 10, an inverter circuit board 28 is installed on the back side of the housing 23. The inverter circuit board 28 is provided with an inverter transformer 29 and a socket 30 connected to the inverter transformer 29.
Since the drive side and the intermediate portion side of the pseudo U-shaped tube 100 are alternately arranged, the inverter transformer 29 for driving the pseudo U-shaped tube 100 is also disposed every other pseudo U-shaped tube 100. The Then, the connectors 103 of the pseudo U-shaped tube 100 are connected to the corresponding sockets 30 respectively. The drive system by the inverter transformer 29 is set in advance according to the configuration shown in FIGS.

  With the above configuration, the rib 52 provided in the lamp holder 5 has a space in which the first holding portion 201 and the intermediate portion of the fluorescent lamp 21 are accommodated when the lamp holder 5 is attached to the housing 23. It is preferable that the closed space is formed except for the notch 51 where the fluorescent lamp 21 is located. In addition, when there are a hole and a notch necessary for fixing the lamp holder 5 to the housing 23 or the like, a closed space excluding these portions is formed.

Thus, for example, even if dust or foreign matter enters the housing 23 from the outside of the housing 23 through the opening 231, the space on the first holding portion 201 side and the space on the intermediate portion side of the fluorescent lamp 21 Are separated by the ribs 52, dust and foreign substances do not diffuse, and the spread of contamination can be suppressed.
However, the height of the ribs 52 may be appropriately changed according to the required characteristics of contamination. For example, when the height of the rib 52 is lowered, the accommodation space of the first holding part 201 and the accommodation space of the intermediate part of the fluorescent lamp 21 are partially communicated. Here, when the required characteristic of contamination is satisfied and the workability and cost of the lamp holder 5 can be improved, the rib 52 having an optimal height can be appropriately provided.

8 to 10, the configuration example using only the first holding member 201 has been described. However, the configuration using both the first holding member 201 and the second holding member 202 as shown in FIG. The fluorescent lamp 21 can be mounted in the same procedure.
Also in this case, the first holding member 201 is accurately positioned by the rib 52, and the accommodation space of the first holding member 201 and the accommodation space of the second holding member 202 are separated by the rib 52. Therefore, high positioning accuracy can be realized without increasing contamination.

  Further, although the mounting process using the pseudo U-shaped tube is shown in the examples of FIGS. 8 to 10 described above, the same applies to the mounting using a normal U-shaped tube or a U-shaped tube. Also in this case, the first holding member 201 is accurately positioned by the rib 52, and further, the accommodation space of the first holding member 201 and the accommodation space of the bent portion of the fluorescent lamp are separated by the rib 52. Realizes high positioning accuracy without spreading contamination near the fluorescent tube bent part (the entire bent part for a U-shaped tube, two bent parts for a U-shaped tube and the area between them), and is uniform on the entire screen It is possible to form a luminance distribution.

It is sectional drawing which shows the structural example of the liquid crystal display device using the backlight apparatus by this invention. It is a figure for demonstrating an example of arrangement | positioning and a drive system of the fluorescent lamp of a backlight apparatus. It is a figure for demonstrating other examples of arrangement | positioning and a drive system of the fluorescent lamp of a backlight apparatus. It is a figure for demonstrating other examples of arrangement | positioning and a drive system of the fluorescent lamp of a backlight apparatus. It is a figure which shows the structural example of the holding member attached to the fluorescent lamp in the backlight apparatus by this invention. It is a figure which shows the other structural example of the holding member used in order to hold | maintain a fluorescent lamp in the backlight apparatus by this invention. It is a figure for demonstrating the structural example of the lamp holder used for the backlight apparatus of this invention. It is a figure for demonstrating the procedure which mounts a fluorescent tube in the housing | casing of a backlight. It is a figure for demonstrating the procedure which mounts a fluorescent tube in the housing | casing of a backlight. It is a figure for demonstrating the procedure which mounts a fluorescent tube in the housing | casing of a backlight.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Liquid crystal panel, 2 ... Backlight apparatus, 3, 4 ... Frame, 5 ... Lamp holder, 21 ... Fluorescent lamp, 22 ... Reflection sheet, 23 ... Case, 24 ... Diffusing plate, 25 ... Diffusing sheet, 26 ... Prism Sheet 27: Reflective polarizing plate 28 ... Inverter circuit board (lamp drive circuit) 29 ... Inverter transformer 30 ... Socket (connection means) 51 ... Notch 51a, 51d ... First notch 51b, 51c ... Second notch, 52 (52a, 52b, 52c, 52d, 52e) ... rib (shielding means), 100 ... pseudo U-tube, 101a, 101b ... electrode, 102 ... lead wire, 103 ... connector (connecting means), 104 ... lead wire, 201, 202 ... holding part, 201, 202 ... holding member, 231 ... opening.

Claims (10)

A lamp holder that stores an electrode portion and a bent portion in a lamp unit that includes two or more straight portions, an electrode portion that is electrically connected to a lamp driving circuit, and a bent portion that connects the straight portions. And
A first notch for housing the electrode portion;
A plurality of adjacent second cutouts for accommodating the bent portion;
A lamp comprising a shielding means for spatially shielding the bent portion from the electrode portion between each second notch and the adjacent first notch. holder.   The lamp holder according to claim 1, wherein the first cutout and the second cutout are alternately provided in the lamp arrangement direction in the same number.   3. The lamp holder according to claim 1, wherein the bent portion includes two fluorescent tube electrodes and a lead wire connecting the two electrodes.   2. The lamp unit according to claim 1, wherein the lamp unit is any one of a U-shaped tube, a U-shaped tube, or an assembly in which two linear fluorescent tubes are connected by a lead wire to form a substantially U-shape. 2. The lamp holder according to 2. A plurality of lamp units composed of two or more linear portions, an electrode portion electrically connected to the lamp driving circuit, and a bent portion connecting the linear portions;
A lamp holder that houses the electrode portion and the bent portion;
In a backlight device composed of a housing that houses the lamp unit and the lamp holder,
The lamp unit is arranged in the casing in which the linear portions are parallel to each other, and the electrode portions and the bent portions are alternately arranged in the lamp arrangement direction.
The lamp holder has a first notch for accommodating the electrode portion, and a plurality of second notches provided adjacent to each other for accommodating the bent portion. A backlight device, wherein the bent portion is attached to the electrode portion in a state of being spatially shielded by a shielding means between the second notch and the adjacent first notch.   The backlight device according to claim 5, wherein the housing includes a through hole through which a connection unit for connecting the electrode unit and the lamp driving circuit is provided on a surface to which the lamp holder is attached.   The lamp holders are attached in pairs so as to accommodate the electrode portions and the bent portions respectively arranged in the lamp arrangement direction on both end sides of the casing by arranging the linear portions in parallel. The backlight device according to claim 5, wherein the backlight device is a backlight device.   In a state where the lamp holder is attached to the housing, the space for accommodating the individual electrode portions and the space for accommodating the bent portion are configured to form a closed space except for the notches. The backlight device according to any one of claims 5 to 7.   The backlight device according to any one of claims 5 to 8, wherein the bent portion includes two fluorescent tube electrodes and a lead wire connecting the two electrodes.   6. The lamp unit according to claim 5, wherein the lamp unit is any one of a U-shaped tube, a U-shaped tube, or an assembly in which two linear fluorescent tubes are connected by a lead wire to form a substantially U-shape. The backlight device according to any one of 8.

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