JP2012003978A - Lighting system for display device, display device, and television receiver - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lighting system for a display device with rigidity of a chassis enhanced which can prevent damages of a linear light source while avoiding weight increase of the display device, a display device and a television receiver.SOLUTION: The lighting system for a display device 20 used for a display device 10 equipped with a display panel 11, includes a plurality of linear light sources 21 and a chassis 22 housing the plurality of linear light sources 21. The plurality of linear light sources 21 are arranged in parallel, a lamp retaining member 30 for retaining the linear light sources 21 at positions with a given distance away from a bottom plate 22A is mounted on the bottom plate 22A arranged to oppose to the display panel 11 of the chassis 22, and a high-rigidity part 50 having higher rigidity than other parts of the bottom plate 22A is formed in a shape extended in a direction along an axis line direction of the linear light sources 21 at the bottom plate 22A.

Description

  The present invention relates to a lighting device for a display device, a display device, and a television receiver.

  For example, a display device that does not emit light, such as a display device of a liquid crystal television, is generally provided with a lighting device for the display device. As this type of lighting device, one having a large number of linear light sources (such as cold cathode tubes) and a chassis that houses the linear light sources is known (for example, Patent Document 1). The chassis is made of a metal plate, and a lamp clip for holding a linear light source is attached to a bottom plate arranged facing the display panel. The linear light sources are located at a certain distance from the bottom plate of the chassis by holding the lamp clips at a plurality of positions in the axial direction.

JP 2007-33962 A

  By the way, in recent years, since the enlargement of the display device is remarkable, it is necessary to increase its rigidity in order to prevent the warp of the chassis. However, it is not preferable to increase the overall thickness in order to increase the rigidity of the chassis, since this increases the weight of the display device.

  Therefore, it is conceivable to secure necessary rigidity while avoiding the weight of the display device by forming high-rigidity parts having higher rigidity than other parts at a plurality of locations on the bottom plate of the chassis. However, when high rigidity portions are formed at a plurality of locations on the bottom plate of the chassis, there is a difference in height between one high rigidity portion and another high rigidity portion, and a plurality of lamp clips supporting one linear light source. In the meantime, there is a risk that a difference in height occurs in the mounting position. If there is a height difference in the mounting position of the lamp clip, stress is applied to the linear light source held by the lamp clip, and excessive stress may cause damage to the linear light source. It was.

  The present invention has been completed based on the above-described circumstances, and is for a display device that can increase the rigidity of the chassis and prevent damage to the linear light source while avoiding the weight of the display device. An object is to provide an illumination device, a display device, and a television receiver.

  A display device illumination device according to the present invention is a display device illumination device used for a display device including a display panel, and includes a plurality of linear light sources and a chassis that accommodates the plurality of linear light sources. The plurality of linear light sources are arranged in parallel, and the linear light source is held at a position away from the bottom plate by a predetermined distance on the bottom plate of the chassis facing the display panel. A lamp holding member is attached, and the bottom plate is formed with a high rigidity portion having higher rigidity than other portions of the bottom plate in a shape extending in a direction along the axial direction of the linear light source. It is.

  According to such a configuration, the rigidity of the chassis can be increased by the high rigidity portion formed on the bottom plate of the chassis. Further, since the high-rigidity part is only formed on a part of the bottom plate of the chassis, it is possible to avoid the weight of the display device. Furthermore, since the bottom plate of the chassis is flat along the extending direction of the high-rigidity portion, that is, flat in the direction along the axial direction of the linear light source, it is between the lamp holding members that hold one linear light source. It is possible to prevent the difference in height from occurring. Therefore, according to the present invention, it is possible to increase the rigidity of the chassis and prevent damage to the linear light source while avoiding the weight of the display device.

The high-rigidity portion may be a ridge formed by projecting the bottom plate to the side opposite to the side on which the lamp holding member is attached.
Further, the plurality of linear light sources are arranged side by side at positions where the axes are shifted from each other, and the high-rigidity portion is formed in a plurality in the same direction as the parallel direction of the linear light sources. Also good. According to such a configuration, the bottom plate of the chassis is flat in a direction along the axial direction of the linear light source over a wide range.

The bottom plate may be formed with the highly rigid portion having a length dimension equivalent to the length dimension of the linear light source. According to such a configuration, since the bottom plate of the chassis becomes flat over almost the entire length of the linear light source, damage to the linear light source can be reliably prevented.
The bottom plate may be formed with a plurality of the high-rigidity portions having a length dimension smaller than the length dimension of the linear light source. Such a configuration is advantageous when a space sufficient to form a high-rigidity portion having a length dimension equivalent to the length dimension of the linear light source cannot be secured on the bottom plate of the chassis.

  The bottom plate includes a plurality of high-rigidity portions having different length dimensions, and a first high-rigidity portion having a large length dimension among the plurality of high-rigidity portions is formed at a central portion of the bottom plate. The second high-rigidity portion having a length dimension smaller than that of the first high-rigidity portion among the plurality of high-rigidity portions is formed at a symmetrical position with the first high-rigidity portion interposed therebetween in the bottom plate. It is good also as what is done. According to such a configuration, the rigidity of the bottom plate can be increased in a balanced manner.

  The second high-rigidity part is formed at a position aligned with both ends and a center part in the extending direction of the first high-rigidity part of the bottom plate, and the first high-rigidity part of the second high-rigidity part. The second central high-rigidity part aligned with the central part of the part is formed at a position closer to the first high-rigidity part than the second end high-rigidity part aligned with both ends of the first high-rigidity part It is good.

  Further, the plurality of linear light sources are arranged side by side at positions where axes are shifted from each other, and the bottom plate has higher rigidity than other portions of the bottom plate and is equivalent to the high-rigidity portion or The auxiliary rigid part having lower rigidity may be formed in a shape extending in a direction intersecting with the extending direction of the high rigid part.

  According to such a configuration, since the bottom plate of the chassis is flat not only in the extending direction of the high-rigidity part but also in the direction intersecting with the extending direction, the height difference between the parallel linear light sources can be reduced. . In addition, since the rigidity of the auxiliary rigid portion is equal to or lower than that of the high rigid portion, the flatness in the direction along the axial direction of the linear light source can be maintained.

  The auxiliary rigid portion is formed at a central portion of the bottom plate and the periphery thereof, and the first auxiliary rigid portion formed at the central portion of the bottom plate is a second auxiliary rigidity formed at the periphery of the bottom plate. It is good also as what has higher rigidity than a part. As described above, the bottom plate can be efficiently flattened by forming the first auxiliary rigid portion having relatively high rigidity at the most flexible center portion of the bottom plate of the chassis.

The auxiliary rigid portion may connect one end portion in the extending direction of one of the high rigid portions and one end portion in the extending direction of the other high rigid portion.
Moreover, it has a stand which supports the said chassis, The said stand is good also as what is provided with the reinforcement pillar distribute | arranged along the surface on the opposite side to the side to which the said lamp | ramp holding member of the said baseplate is attached.

The display device of the present invention includes the display device illumination device and a display panel that performs display using light from the display device illumination device.
The display panel may be a liquid crystal panel using liquid crystal.
The television receiver of this invention is provided with the said display apparatus.

  According to the present invention, it is possible to provide an illumination device for a display device, a display device, and a television receiver that can increase the rigidity of the chassis and prevent damage to a linear light source while avoiding the weight of the display device. Can do.

1 is an exploded perspective view showing a schematic configuration of a television receiver according to Embodiment 1. FIG. Exploded perspective view showing schematic configuration of liquid crystal display device Plan view of lighting device showing form of high-rigidity part Sectional drawing which shows the cross-sectional structure along the short side direction of a liquid crystal display device Sectional drawing which shows the cross-sectional structure along the long side direction of a liquid crystal display device Schematic rear view of liquid crystal display device The top view of the illuminating device which shows the form of the highly rigid part concerning Embodiment 2, and an auxiliary | assistant rigid part. The top view of the illuminating device which shows the form of the highly rigid part concerning Embodiment 3, and an auxiliary | assistant rigid part.

<Embodiment 1>
Hereinafter, Embodiment 1 which actualized this invention is demonstrated in detail, referring FIGS. 1-6. In the present embodiment, a television receiver TV including the liquid crystal display device (display device) 10 is illustrated.

  As shown in FIG. 1, the television receiver TV according to the present embodiment includes a liquid crystal display device 10, front and back cabinets Ca and Cb that are accommodated so as to sandwich the liquid crystal display device 10, and a stand 40. The Hereinafter, in each component, the lower left side (front side of the television receiver TV, the display side) in FIG. 1 will be described as the front side, the upper right side as the back side, the upper side as the upper side, and the lower side as the lower side.

  As shown in FIG. 2, the liquid crystal display device 10 includes a liquid crystal panel (display panel) 11 and a display device illumination device (hereinafter simply referred to as illumination device 20), which is an external light source. Are integrally held. In the present embodiment, the liquid crystal display device 10 has a horizontally long rectangular shape as a whole, and is used in a vertically placed state, that is, in a form in which the panel surface (display surface) 11A of the liquid crystal panel 11 is substantially parallel to the vertical direction.

  The liquid crystal panel 11 is configured such that a pair of glass substrates are bonded together with a predetermined gap therebetween, and liquid crystal is sealed between the glass substrates. One glass substrate is provided with a switching element (for example, TFT) connected to a source wiring and a gate wiring orthogonal to each other, a pixel electrode connected to the switching element, and the other glass substrate is opposed to An electrode and a color filter in which colored portions such as R, G, and B are arranged in a predetermined arrangement are provided.

The illuminating device 20 is a so-called direct-type illuminating device 20, and a plurality of linear light sources (here, a cold cathode tube 21 is used as a high-pressure discharge tube) at a position directly below the back surface of the panel surface 11A of the liquid crystal panel 11. It has a configuration comprising
The illumination device 20 includes a chassis 22 that houses a plurality of cold cathode tubes 21. The chassis 22 is formed of a metal sheet metal and has a shallow, substantially box shape opened on the surface side (the liquid crystal panel 11 side). The chassis 22 has a bottom plate 22A having a rectangular shape and a side plate 22B that rises from the peripheral edge to the front side.

  An optical member 23 is attached to the chassis 22 so as to cover the opening. The optical member 23 includes a diffusion plate, a diffusion sheet, a lens sheet, and an optical sheet in order from the lower side (chassis 22 side) in FIG. A metal frame 24 for holding the optical member 23 on the chassis 22 is installed on the surface side of the optical member 23.

  Inside the chassis 22 are a cold cathode tube 21, a lamp clip (lamp holding member) 30 for attaching the cold cathode tube 21 to the chassis 22, a relay connector 25 that supports the end of the cold cathode tube 21, and a cold cathode. A holder 26 that collectively covers the end of the tube 21 group and the relay connector 25 is provided.

  The cold-cathode tube 21 has a long and narrow tubular shape, with its length direction (axial direction) coinciding with the longitudinal direction of the chassis 22, and the position where the axial lines deviate from each other, in other words, a large number of them are substantially parallel to each other. They are arranged in positions and accommodated in the chassis 22. The cold cathode tube 21 is held by the lamp clip 30 to be held at a predetermined distance from the bottom plate 22A of the chassis 22, and a slight gap is provided between the cold cathode tube 21 and the bottom plate 22A. It has been. The bottom plate 22 </ b> A of the chassis 22 is disposed to face the liquid crystal panel 11 so as to be substantially parallel to the liquid crystal panel 11.

  Each cold cathode tube 21 is held by a lamp clip 30 at a plurality of locations (at least three locations in this embodiment). Further, both end portions of each cold cathode tube 21 in the axial direction are fitted into relay connectors 25, and holders 26 are attached so as to cover these relay connectors 25. The holder 26 is made of white synthetic resin and has a long and narrow box shape extending along the short direction of the chassis 22. A plurality of attachment holes 28 for attaching the relay connector 25 are formed in the bottom plate 22A of the chassis 22 at both ends in the long side direction.

  The lamp clip 30 that holds the cold cathode tube 21 is made of synthetic resin (for example, made of polycarbonate), and has a white surface with excellent light reflectivity. As shown in FIG. 4, the lamp clip 30 includes a lamp gripping portion 31 that grips the cold cathode tube 21 and a locking portion 32 that locks the chassis 22. In the present embodiment, one lamp clip 30 is provided with three lamp gripping portions 31, and each lamp clip 30 can hold three cold cathode tubes 21 at a time. These lamp gripping portions 31 are provided side by side on a base portion 33 having a long and thin rectangular plate shape. The base portion 33 is provided with a protruding pin 34 that supports the optical member 23 from the back side and regulates bending or warping to the back side (cold cathode tube 21 side).

  The lamp gripping portions 31 are provided at both end portions and the central portion in the longitudinal direction of the base portion 33. The interval between the lamp gripping portions 31 coincides with the parallel pitch of the cold cathode tubes 21. Each lamp gripping portion 31 has a pair of arm portions 31A for elastically holding the cold cathode tube 21, and has a substantially annular shape that opens to the front as a whole.

  The locking portions 32 are provided as a pair on the back surface of the base portion 33 (the surface on the side opposite to the lamp gripping portion 31 side) and at both ends in the longitudinal direction of the base portion 33. The locking portion 32 has a pair of locking legs 32 </ b> A that elastically lock to a locking port 29 formed in the bottom plate 22 </ b> A of the chassis 22.

  The lamp clip 30 is distributed and attached to the bottom plate 22A of the chassis 22 so that the longitudinal direction of the base portion 33 coincides with the parallel direction of the cold cathode tubes 21 (substantially orthogonal to the axial direction of the cold cathode tubes 21). Yes.

  A reflection sheet 35 is disposed on the inner surface side of the bottom plate 22A of the chassis 22 (on the side opposite to the light emitting side of the cold cathode tube 21). The reflection sheet 35 is made of synthetic resin, and the surface thereof is white with excellent light reflectivity. The reflection sheet 35 is laid and integrated so as to cover almost the entire area along the inner surface of the chassis 22, and constitutes a wall surface (light reflection surface) of the chassis 22.

  Various circuit boards 36 such as an inverter board are provided on the rear surface of the chassis 22 (the outer surface opposite to the side where the cold cathode tubes 21 are disposed) (see FIG. 2). The circuit board 36 is obtained by mounting various electronic components on a substantially plastic base material made of synthetic resin, and is provided at both ends and the center of the chassis 22 in the long side direction. The circuit board 36 is omitted in drawings other than FIG.

  A plurality of high-rigidity portions 50 are formed on the bottom plate 22A of the chassis 22 (see FIG. 3). The high-rigidity part 50 is a part having higher rigidity (stiffness in the long side direction of the bottom plate 22A) than the other part in the bottom plate 22A, and a direction along the axial direction of the cold cathode tube 21 (long-side direction of the chassis 22). ). The high-rigidity portion 50 is a protrusion formed by protruding (depressing) the bottom plate 22A of the chassis 22 to the back side (the side opposite to the side to which the lamp clip 30 is attached). As shown in FIG. 4, all the highly rigid portions 50 have substantially the same width dimension and protruding dimension (recess dimension, depth dimension), that is, all the highly rigid sections 50 have equivalent rigidity. is doing. In the bottom plate 22A of the chassis 22, the high rigidity portion 50 and other portions have the same thickness dimension of the metal sheet metal itself.

  As shown in FIG. 3, a plurality of high rigidity parts 50 (five in this embodiment) are formed side by side in the same direction as the parallel direction of the cold cathode fluorescent lamps 21 (the short side direction of the chassis 22 and the vertical direction). ing. The high-rigidity parts 50 are substantially parallel to each other and are located at substantially equal intervals. Specifically, the high rigidity portion 50 is formed at a position where the bottom plate 22A of the chassis 22 is equally divided in the short side direction (in this embodiment, the bottom plate 22A is equally divided into six regions). Further, all the high-rigidity parts 50 have substantially the same length dimension, and the length dimension is equivalent to the length dimension of the cold cathode tube 21. Each high-rigidity portion 50 is formed at a position between the adjacent cold cathode tubes 21 in the bottom plate 22A. The high-rigidity portion 50 is symmetric with respect to the short-side direction center line and the long-side direction center line of the bottom plate 22A.

The lighting device 20 is provided with a stand 40. The stand 40 is attached to the lower side of the chassis 22 and supports the chassis 22, thereby holding the liquid crystal display device 10 in a vertical posture (see FIG. 6).
The stand 40 includes a pedestal portion 41 and a shaft portion 42 that rises from the pedestal portion 41 in the vertical direction. The stand 40 is attached to the chassis 22 at a position where the axis of the shaft portion 42 coincides with the center line in the long side direction of the chassis 22.

  The stand 40 includes a pair of reinforcing columns 43 arranged along the rear surface of the chassis 22 (the surface opposite to the side on which the lamp clip 30 is attached). The reinforcing pillar 43 is formed in an elongated column shape as a whole by bending a metal plate material. A pair of reinforcing pillars 43 are provided at positions symmetrical with respect to the shaft portion 42 of the stand 40.

  The pair of reinforcing pillars 43 are substantially parallel to each other and intersect the high-rigidity portion 50 formed on the bottom plate 22A of the chassis 22 substantially orthogonally. The reinforcing column 43 has a length dimension (a length dimension equivalent to the short side of the bottom plate 22A) enough to traverse the bottom plate 22A of the chassis 22 in the vertical direction (short direction of the chassis 22). Extends linearly from the top edge to the top edge. Each of the pair of reinforcing columns 43 is screwed to the bottom plate 22 </ b> A of the chassis 22, and a lower end portion is screwed to a receiving portion 44 provided at an upper end of the shaft portion 42. The receiving portion 44 has a shape that protrudes from the upper end of the shaft portion 42 to both sides, and the protruding end portion rises upward.

According to the first embodiment configured as described above, the following effects can be obtained.
The illuminating device 20 of this embodiment is an illuminating device 20 used for the liquid crystal display device 10 including the liquid crystal panel 11, and includes a plurality of cold cathode tubes 21 and a chassis 22 that accommodates the plurality of cold cathode tubes 21. The plurality of cold cathode tubes 21 are arranged in parallel, and the cold cathode tubes 21 are separated from the bottom plate 22A by a predetermined distance on the bottom plate 22A arranged opposite to the liquid crystal panel 11 in the chassis 22. A lamp clip 30 to be held in position is attached, and a high rigidity portion 50 having higher rigidity than other portions of the bottom plate 22A extends in a direction along the axial direction of the cold cathode tube 21 on the bottom plate 22A. Is formed.

The rigidity of the chassis 22 can be increased by the high rigidity portion 50 formed on the bottom plate 22 </ b> A of the chassis 22. Moreover, since the highly rigid part 50 is only formed in a part of the bottom plate 22A of the chassis 22, the weight of the liquid crystal display device 10 can be avoided. Further, since the bottom plate 22A of the chassis 22 is flat along the extending direction of the high-rigidity portion 50, that is, flat in the direction along the axial direction of the cold cathode tube 21, a lamp that holds one cold cathode tube 21 is used. It is possible to prevent a difference in height between the clips 30.
Therefore, the weight of the liquid crystal display device 10 can be avoided, the rigidity of the chassis 22 can be increased, and the cold cathode tube 21 can be prevented from being damaged.

  The plurality of cold cathode tubes 21 are arranged side by side at positions where the axes are shifted from each other, and the plurality of high-rigidity portions 50 are formed side by side in the same direction as the parallel direction of the cold cathode tubes 21. Thereby, the bottom plate 22A of the chassis 22 is flat in a direction along the axial direction of the cold cathode tube 21 over a wide range.

  Further, a high rigidity portion 50 having a length dimension equivalent to the length dimension of the cold cathode tube 21 is formed on the bottom plate 22A of the chassis 22. Thereby, since the bottom plate 22A of the chassis 22 becomes flat over almost the entire length of the cold cathode tube 21, damage to the cold cathode tube 21 can be reliably prevented.

<Embodiment 2>
Next, a television receiver TV according to Embodiment 2 embodying the present invention will be described with reference to FIG.
In the television receiver TV of the present embodiment, the bottom plate 22A of the chassis 22 has a higher rigidity than the other parts of the bottom plate 22A, and an auxiliary rigid portion having a rigidity equal to or lower than that of the high-rigidity portion 50. 60 differs from the first embodiment in that 60 is formed in a shape extending in a direction intersecting with the extending direction of the high-rigidity portion 50. In addition, the same code | symbol is attached | subjected to the structure similar to Embodiment 1, and the overlapping description is abbreviate | omitted.

  As in the first embodiment, the television receiver TV according to this embodiment includes a liquid crystal display device 10, front and back cabinets Ca and Cb that are accommodated so as to sandwich the liquid crystal display device 10, and a stand 40. The And the liquid crystal display device 10 is provided with the liquid crystal panel 11 and the illuminating device 20 similarly to Embodiment 1, and the illuminating device 20 is equipped with the structure which comprised the several cold cathode tube 21 and the chassis 22 which accommodates these. It has become. On the bottom plate 22 </ b> A of the chassis 22, as in the first embodiment, a plurality of (five as in the first embodiment) high-rigidity portions 50 are formed side by side.

  In addition to the high-rigidity portion 50, a plurality (eight in this embodiment) of auxiliary rigid portions 60 are formed on the bottom plate 22 </ b> A of the chassis 22. Similar to the high-rigidity portion 50, the auxiliary rigid portion 60 is a protrusion formed by protruding the bottom plate 22A to the back side, and has a higher rigidity than the other portions of the bottom plate 22A (the rigidity in the short side direction of the bottom plate 22A). ). The auxiliary rigid portion 60 has a width dimension and a projecting dimension that are smaller than the width dimension and the projecting dimension of the high-rigidity section 50, and is set to be less rigid than the high-rigidity section 50. It should be noted that the thickness of the metal sheet metal itself is the same between the auxiliary rigid portion 60 and other portions of the bottom plate 22A of the chassis 22.

  The auxiliary rigid portion 60 is formed in the central portion of the bottom plate 22A of the chassis 22 and its periphery. 60 A of 1st auxiliary | assistant rigid parts formed in the center part of 22 A of bottom plates among the auxiliary | assistant rigid parts 60 have higher rigidity than the 2nd auxiliary | assistant rigid part 60B formed in the circumference | surroundings among 22 A of bottom boards.

  In the present embodiment, four first auxiliary rigid portions 60A are formed. All the first auxiliary rigid portions 60A have substantially the same width dimension and protruding dimension (recess dimension, depth dimension), that is, these first auxiliary rigid sections 60A have the same rigidity. .

  60 A of 1st auxiliary | assistant rigid parts are the high rigidity part 50 located in the approximate center (substantially the center of the short side direction of 22 A of bottom plates) among several high rigidity parts 50, and the high rigidity adjacent to the upper and lower sides of this high rigidity part 50. It is formed at a position between the portion 50. 60 A of 1st auxiliary | assistant rigid parts are provided in the symmetrical position on both sides of the high-rigidity part 50 above and below the high-rigidity part 50 located in the center of 22 A of bottom plates. The first auxiliary rigid portion 60 </ b> A has a shape extending in a direction perpendicular to the high rigid portion 50, and the length dimension thereof is the same as the interval between the adjacent high rigid portions 50. That is, one end in the length direction of the first auxiliary rigid portion 60 </ b> A is in contact with one high rigid portion 50 of the adjacent high rigid portions 50, and the other end is in contact with the other high rigid portion 50.

  In the present embodiment, four second auxiliary rigid portions 60B are formed. All the second auxiliary rigid portions 60B have substantially the same width dimension and protruding dimension (recess dimension, depth dimension), that is, these second auxiliary rigid portions 60B have equivalent rigidity. The second auxiliary rigid portion 60B has both a width dimension and a protruding dimension that are smaller than the width dimension and the protruding dimension of the first auxiliary rigid portion 60A, and is set to be lower in rigidity than the first auxiliary rigid portion 60A.

  The second auxiliary rigid portion 60B has a shape extending in a direction perpendicular to the high rigid portion 50 (a direction substantially parallel to the first auxiliary rigid portion 60A), and its length dimension is the first auxiliary rigid portion. It is equivalent to the length dimension of 60A (equivalent to the interval between adjacent high-rigidity parts 50). That is, like the first auxiliary rigid portion 60A, one end in the length direction of the second auxiliary rigid portion 60B is in contact with one high rigid portion 50 of the adjacent high rigid portions 50, and the other end is the other high rigid portion. It is in contact with the part 50.

  The second auxiliary rigid portions 60B are formed one by one in the bottom plate 22A on the left and right outer sides of the first auxiliary rigid portion 60A and on the upper and lower outer sides, that is, in the vicinity of the corners of the bottom plate 22A. ing. The second auxiliary rigid portion 60B includes a position between the high-rigidity portion 50 located on the uppermost side among the plurality of high-rigidity portions 50 and the high-rigidity portion 50 adjacent to the high-rigidity portion 50, and a plurality of high-rigidity portions. The high-rigidity part 50 located on the lowermost side of the part 50 and the high-rigidity part 50 adjacent to the high-rigidity part 50 are located. Further, the second auxiliary rigid portion 60B is formed at a position that substantially bisects the interval between the first auxiliary rigid portion 60A and both end edges in the long side direction of the bottom plate 22A. The second auxiliary rigid portion 60B has a symmetrical shape with the high rigid portion 50 located at the center of the bottom plate 22A interposed therebetween. The first auxiliary rigid portion 60A and the second auxiliary rigid portion 60B are symmetrical with respect to the center line in the long side direction of the bottom plate 22A.

  As described above, in the present embodiment, the plurality of cold cathode tubes 21 are arranged side by side at positions where the axes are shifted from each other, and the bottom plate 22A of the chassis 22 has higher rigidity than the other portions of the bottom plate 22A. The auxiliary rigid portion 60 having a rigidity equal to or lower than that of the high-rigidity portion 50 is formed in a shape extending in a direction intersecting with the extending direction of the high-rigidity portion 50. As a result, the bottom plate 22A of the chassis 22 becomes flat not only in the extending direction of the high-rigidity portion 50 but also in the direction intersecting therewith, so that the height difference between the cold cathode tubes 21 arranged in parallel can be reduced. Further, since the rigidity of the auxiliary rigid portion 60 is equal to or lower than that of the high-rigidity portion 50, the flatness in the direction along the axial direction of the cold cathode tube 21 can be maintained.

  The auxiliary rigid portion 60 is formed at the center portion of the bottom plate 22A of the chassis 22 and the periphery thereof, and the first auxiliary rigid portion 60A formed at the center portion of the bottom plate 22A is formed around the bottom plate 22A. It has higher rigidity than the second auxiliary rigidity portion 60B. In this way, by forming the first auxiliary rigid portion 60A having relatively high rigidity at the most flexible center portion of the bottom plate 22A of the chassis 22, the bottom plate 22A can be efficiently flattened.

<Embodiment 3>
Next, a television receiver TV according to Embodiment 3 embodying the present invention will be described with reference to FIG.
In the television receiver TV of the present embodiment, a plurality of high-rigidity portions 70 having a length smaller than the length of the cold cathode tube 21 are formed on the bottom plate 22A of the chassis 22, and the bottom plate 22A of the chassis 22 A shape of the auxiliary rigid portion 71 having higher rigidity than other portions of the bottom plate 22 </ b> A and having rigidity equal to or lower than that of the high-rigidity portion 70 extends in a direction intersecting with the extending direction of the high-rigidity portion 70. This is different from the first embodiment in that it is formed as described above. In addition, the same code | symbol is attached | subjected to the structure similar to Embodiment 1, and the overlapping description is abbreviate | omitted.

  As in the first embodiment, the television receiver TV according to this embodiment includes a liquid crystal display device 10, front and back cabinets Ca and Cb that are accommodated so as to sandwich the liquid crystal display device 10, and a stand 40. The And the liquid crystal display device 10 is provided with the liquid crystal panel 11 and the illuminating device 20 similarly to Embodiment 1, and the illuminating device 20 is equipped with the structure which comprised the several cold cathode tube 21 and the chassis 22 which accommodates these. It has become.

  A plurality (seven in this embodiment) of high-rigidity portions 70 having different lengths are formed side by side on the bottom plate 22A of the chassis 22. The high-rigidity portion 70 is a portion having higher rigidity than the other portions of the bottom plate 22A as in the first embodiment, and has a shape extending in the direction along the axial direction of the cold cathode tube 21 (long side direction of the chassis 22). It is formed with. The high-rigidity portion 70 is a ridge formed by protruding (depressing) the bottom plate 22A to the back side (the side opposite to the side to which the lamp clip 30 is attached), as in the first embodiment.

  Of the plurality of high-rigidity portions 70, one first high-rigidity portion 72 having a large length is formed at the center of the bottom plate 22A. The first high-rigidity portion 72 has a length dimension equivalent to that of the cold cathode tube 21 and is formed at the center position in the short side direction (vertical direction) of the bottom plate 22A.

  Of the plurality of high-rigidity portions 70, a plurality (six in this embodiment) of second high-rigidity portions 73 that are smaller in length than the first high-rigidity portion 72 are formed on the bottom plate 22A. The second high-rigidity portion 73 is substantially the same as the first high-rigidity portion 72 in width and protrusion dimensions (indentation size, depth size), that is, all the second high-rigidity portions 73 are the same as the first high-rigidity portion 72. Has the same rigidity.

  The second high-rigidity portion 73 is formed in half (three in each) in the region above and below the first high-rigidity portion 72, and is symmetrical with the first high-rigidity portion 72 in between. There is no. Further, the second high-rigidity portion 73 is symmetrical with the center line in the long side direction of the bottom plate 22A interposed therebetween.

  The second high-rigidity portion 73 is located at each of the bottom plate 22A at the both ends and the central portion in the extending direction of the first high-rigidity portion 72, in other words, at both the end portions and the central portion in the long side direction of the bottom plate 22A. Two each are formed. All the second high-rigidity portions 73 are substantially parallel to the first high-rigidity portion 72, and among all the second high-rigidity portions 73, the second central high-rigidity portion 73 </ b> A aligned with the central portion of the first high-rigidity portion 72. Is formed at a position closer to the first high-rigidity portion 72 than the second end high-rigidity portion 73 </ b> B aligned with both ends of the first high-rigidity portion 72. The distance between the second high-rigidity portion 73B and the first high-rigidity portion 72 is approximately twice the distance between the second central high-rigidity portion 73A and the first high-rigidity portion 72, in other words, The second central high-rigidity portion 73 </ b> A is located at the center between the second end high-rigidity portion 73 </ b> B and the first high-rigidity portion 72. Further, the second end high rigidity portions 73B located on the upper side of the first high rigidity portion 72 and the second end high rigidity portions 73B located on the lower side are arranged on the same extension line.

  The second central high-rigidity portion 73A is set to have a length dimension larger than that of the second end high-rigidity portion 73B. In addition, a pair of second central high-rigidity portions 73A and second end high-rigidity portions 73B (one second central high-rigidity portion 73A located above or below the first high-rigidity portion 72 and a pair of second end high-rigidity portions 73A). The dimension obtained by adding the length dimension of the rigid portion 73B) is made smaller than the length dimension of the first highly rigid portion 72. The position of the end opposite to the second central high-rigidity portion 73A and the position of the end of the first high-rigidity portion 72 in the axial direction among both ends in the axial direction of the second high-rigidity portion 73B are up and down. The second central high-rigidity portion 73A and the second end high-rigidity portion 73B are arranged in such a manner that their end positions are shifted in the long-side direction of the bottom plate 22A. Note that all the first high-rigidity portions 72 and the second high-rigidity portions 73 are located between adjacent cold cathode tubes 21 in the bottom plate 22A.

  In addition to the high-rigidity portion 70, a plurality of (four in this embodiment) auxiliary rigid portions 71 are formed on the bottom plate 22 </ b> A of the chassis 22. Similarly to the high-rigidity portion 70, the auxiliary-rigid portion 71 is a protrusion formed by protruding the bottom plate 22A to the back side, and all the auxiliary-rigid portions 71 are formed with substantially the same width dimension and protruding dimension. Have the same rigidity. The auxiliary rigid portion 71 has a width dimension and a projecting dimension that are both smaller than the width dimension and the projecting dimension of the high-rigidity section 70 and higher than the other portions of the bottom plate 22A (stiffness in the short side direction of the bottom plate 22A). And has a rigidity smaller than that of the high-rigidity portion 70.

  Each auxiliary rigid portion 71 connects one end in the extending direction of the second end high-rigidity portion 73B and one end in the extending direction of the second central high-rigidity portion 73A. Each of the auxiliary rigid portions 71 is formed to extend in an oblique direction (direction approaching the first high rigid portion 72 from the second end high rigid portion 73B side toward the second central high rigid portion 73A side). In addition, the length dimension of all the auxiliary | assistant rigid parts 71 is made equivalent.

  As described above, in the present embodiment, the bottom plate 22 </ b> A of the chassis 22 is formed with a plurality of high-rigidity portions 70 having a length dimension smaller than the length dimension of the cold cathode tube 21. Here, in general, the bottom plate of the chassis has a complicated shape such as an uneven shape for fixing a circuit board or the like on the back side of the chassis, and has a length equivalent to that of a cold cathode tube. It may be difficult to form the rigid portion over the entire bottom plate. In such a case, it is advantageous to form a plurality of high-rigidity portions (first high-rigidity portions 72) having a small length as in the present embodiment.

  The bottom plate 22A of the chassis 22 is formed with a plurality of high-rigidity portions 70 having different length dimensions, and the first high-rigidity portion 72 having a large length dimension among the plurality of high-rigidity portions 70 is the center of the bottom plate 22A. Of the plurality of high-rigidity portions 70 and having a length smaller than that of the first high-rigidity portion 72 is symmetrical with the first high-rigidity portion 72 of the bottom plate 22A interposed therebetween. It is formed in the position. Thereby, the rigidity of 22 A of bottom boards can be improved with sufficient balance.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.

(1) In the above embodiment, the chassis 22 is made of metal sheet metal, but may be made of resin molding.
(2) In the above embodiment, the high-rigidity part 50 (70) is a ridge formed by protruding the bottom plate 22A of the chassis 22 to the back side, but the high-rigidity part is not limited to this. It may be of any form as long as it has higher rigidity than the other parts of the bottom plate, for example, it may be a ridge formed by protruding the bottom plate to the front side, In addition, it may be formed by attaching a bar member or the like separate from the chassis so as to be integrated with the bottom plate. Moreover, you may make it form a highly rigid part by thickening the plate | board thickness dimension of a baseplate partially.

(3) In the above embodiment, the high rigidity portion 50 (70) formed on the bottom plate 22A is assumed to have the same rigidity, but not limited to this, a plurality of types of high rigidity parts having different rigidity. The rigid portion may be formed on the bottom plate.
(4) In the above embodiment, the high-rigidity portion 50 (70) formed on the bottom plate 22A is all formed at a position between the adjacent cold cathode tubes 21 in the bottom plate 22A, but is not limited thereto. Alternatively, the high rigidity portion may be formed at a position overlapping the cold cathode tube and the front and back.

(5) In the above embodiment, the number of reinforcing columns 43 provided in the stand 40 is two, but the number is not limited to this, and may be one, or three or more.
(6) In the above embodiment, the reinforcing column 43 provided in the stand 40 extends in the vertical direction, but in addition to this, for example, a reinforcing column extending in the horizontal direction or in an oblique direction may be provided. .

(7) In the above embodiment, the cold cathode tube 21 is used as the linear light source. However, other types of linear light sources such as a hot cathode tube may be used.
(8) In the above embodiment, the liquid crystal display device 10 using the liquid crystal panel 11 as the display panel has been illustrated, but the present invention is also applicable to display devices using other types of display panels.

  (9) In the second and third embodiments, the auxiliary rigid portion 60 (71) has both the width dimension and the projecting dimension smaller than the width dimension and the projecting dimension of the high-rigidity section 50 (70). For example, the width dimension of the auxiliary rigid portion may remain as it is, and only the protruding dimension may be made smaller than that of the high rigid portion.

  TV ... TV receiver, 10 ... Liquid crystal display device (display device), 11 ... Liquid crystal panel (display panel), 20 ... Lighting device (lighting device for display device), 21 ... Cold cathode tube (linear light source), 22 ... Chassis, 22A ... Bottom plate, 30 ... Lamp clip (lamp holding member), 40 ... Stand, 43 ... Reinforcing pillar, 50, 70 ... High rigidity part, 60, 71 ... Auxiliary rigidity part, 60A ... First auxiliary rigidity part, 60B ... second auxiliary rigid part, 72 ... first high rigid part, 73 ... second high rigid part, 73A ... second central high rigid part, 73B ... second end high rigid part

Claims (14)

An illumination device for a display device used for a display device provided with a display panel,
A plurality of linear light sources, and a chassis that houses the plurality of linear light sources,
The plurality of linear light sources are arranged in parallel,
A lamp holding member that holds the linear light source at a position away from the bottom plate by a predetermined distance is attached to the bottom plate that is disposed facing the display panel in the chassis.
In the bottom plate, a high-rigidity portion having higher rigidity than other portions of the bottom plate is formed in a shape extending in a direction along the axial direction of the linear light source.
Lighting device for display device.   2. The illumination device for a display device according to claim 1, wherein the high-rigidity portion is a protrusion formed by projecting the bottom plate to a side opposite to a side on which the lamp holding member is attached. The plurality of linear light sources are arranged side by side at positions where the axes are shifted from each other,
The display device illumination device according to claim 1, wherein a plurality of the high-rigidity portions are formed side by side in the same direction as a parallel direction of the linear light sources.   The illumination device for a display device according to any one of claims 1 to 3, wherein the high rigidity portion having a length dimension equivalent to a length dimension of the linear light source is formed on the bottom plate. .   5. The display device according to claim 1, wherein a plurality of the high-rigidity portions having a length dimension smaller than a length dimension of the linear light source are formed on the bottom plate. 6. Lighting device. The bottom plate is formed with a plurality of the high-rigidity portions having different length dimensions,
A first high-rigidity portion having a large length dimension among the plurality of high-rigidity portions is formed at a center portion of the bottom plate,
A second high-rigidity portion having a length dimension smaller than that of the first high-rigidity portion among the plurality of high-rigidity portions is formed at a position that is symmetrical with respect to the first high-rigidity portion in the bottom plate. The illumination device for a display device according to any one of claims 1 to 5. The second high-rigidity part is formed at a position aligned with both ends and a center part in the extending direction of the first high-rigidity part of the bottom plate,
Of the second high-rigidity part, the second central high-rigidity part aligned with the central part of the first high-rigidity part is higher than the second end high-rigidity part aligned with both ends of the first high-rigidity part. The illumination device for a display device according to claim 6, wherein the illumination device is formed at a position close to the high rigidity portion. The plurality of linear light sources are arranged side by side at positions where the axes are shifted from each other,
In the bottom plate, an auxiliary rigid portion having higher rigidity than other portions of the bottom plate and having rigidity equal to or lower than that of the high-rigidity portion intersects with the extending direction of the high-rigidity portion. The illumination device for a display device according to any one of claims 1 to 7, wherein the illumination device is formed in a shape extending in a direction.   The auxiliary rigid portion is formed at a central portion of the bottom plate and its periphery, and the first auxiliary rigid portion formed at the central portion of the bottom plate is more than a second auxiliary rigid portion formed at the periphery of the bottom plate. The display device illumination device according to claim 8, which has high rigidity.   The display according to claim 8 or 9, wherein the auxiliary rigid portion connects one end portion in the extending direction of one of the high rigid portions and one end portion in the extending direction of the other high rigid portion. Device lighting device. A stand for supporting the chassis;
The display device according to claim 1, wherein the stand includes a reinforcing column disposed along a surface of the bottom plate opposite to a side on which the lamp holding member is attached. Lighting equipment.   A display device comprising: the display device illumination device according to any one of claims 1 to 11; and a display panel that performs display using light from the display device illumination device.   The display device according to claim 12, wherein the display panel is a liquid crystal panel using liquid crystal.   A television receiver comprising the display device according to claim 12 or 13.

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