JP2008293711A - Illumination device for a display device, display, and television receiver - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily detect a mounting failure of a lamp. <P>SOLUTION: In a chassis 13, a plurality of tubular cold-cathode tubes 15 are housed in a state that they are in parallel with one another. On the chassis 13, lamp clips 20 having ended annular lamp gripping parts 27 which surround peripheral faces of the cold-cathode tubes 15 are mounted. The lamp gripping parts 27 have apertures in the horizontal direction that is orthogonal to the vertical direction at the mounting work of the cold-cathode tubes 15. Accordingly, when the mounting depth of the cold-cathode tube 15 is in shortage, the cold-cathode tube 15 is protruded by the extent of the shortage from the regular mounting position in the direction that is orthogonal to the vertical direction at the mounting work. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

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

  The liquid crystal display device includes a liquid crystal panel that displays an image and a backlight that emits light to the liquid crystal panel. This backlight includes a so-called direct-type backlight having a configuration in which a plurality of cold-cathode tubes are arranged in parallel in a chassis installed on the back surface of the liquid crystal panel, and an example thereof is described in Patent Document 1 below. Is known.

In this case, a lamp clip for holding the cold cathode tube in a predetermined position is provided, and the lamp clip has a lamp gripping portion that opens to the liquid crystal panel side. When the cold cathode tube is attached, the lamp gripping portion is once elastically expanded and deformed while passing the cold cathode tube through the opening of the lamp gripping portion. Then, when the cold cathode tube is pushed to the normal depth, the lamp gripping portion is elastically restored, so that the cold cathode tube is gripped in the attached state by the lamp gripping portion.
JP 2001-210126 A

  However, the lamp gripping portion is open upward in the vertical direction during the cold cathode tube mounting operation, and since the cold cathode tube is mounted from the same direction, it is difficult to visually confirm even when the mounting depth is insufficient. For this reason, there is a possibility that the cold cathode tube is shipped with insufficient attachment. As a result, the distance of the cold cathode fluorescent lamp to the liquid crystal panel and the optical member installed on the back side of the liquid crystal panel is smaller than that in the case where the liquid crystal panel is normally attached, and thus display failure may occur. In addition, if the cold cathode tube is not sufficiently attached, there is a concern that the cold cathode tube may drop or crack due to vibrations generated during conveyance.

  The present invention has been completed based on the above-described circumstances, and an object thereof is to easily detect a mounting failure of a lamp.

  The present invention comprises a tubular lamp, a chassis in which a plurality of the lamps are accommodated in parallel, and a lamp gripper that has an end ring surrounding the peripheral surface of the lamp and can grip the lamp, The lamp gripping portion is opened in a direction that intersects the vertical direction when the lamp is attached.

  In this way, if the mounting depth is insufficient when the lamp is mounted on the lamp gripping part, the lamp will be moved from the normal mounting position in the direction that intersects the vertical direction during the mounting operation. Since it protrudes, it can be easily detected that the mounting depth of the lamp is insufficient by visual inspection.

The following configuration is preferable as an embodiment of the present invention.
(1) The lamp gripping portion is configured to open in a direction orthogonal to the vertical direction during the lamp mounting operation. In this way, it is possible to more easily detect that the lamp mounting depth is insufficient.

(2) A lamp guide portion that defines an attachment path when the lamp is attached to the lamp gripping portion is provided. In this way, when the lamp is mounted on the lamp gripping portion, the mounting operation can be performed smoothly by moving the lamp along the lamp guide portion that defines the mounting path. This makes it difficult for the lamp mounting depth to be insufficient.

(3) A lamp holding part having the lamp gripping part is attached to the chassis, and the lamp guide part is integrally formed with the lamp holding part. If the lamp guide part is installed on a part other than the lamp holding part, an assembly error may occur between the part and the lamp holding part. However, if the lamp guide part is integrally formed on the lamp holding part, Such an assembly error can be avoided, and a smooth mounting operation can be expected.

(4) The lamp guide portion is formed at an opening end portion of the lamp gripping portion and extends along the opening direction. If it does in this way, a lamp can be attached to a lamp holding part by pushing a lamp straight along a lamp guide part, and an attachment operation can be made smoother.

(5) The lamp holding part is configured to be provided with a drop-out restricting portion that engages with the lamp that is mounted on the lamp guide portion from the front side in the mounting direction. In this way, even if the lamp normally attached to the lamp gripping part comes off due to the influence of vibration or the like and is placed on the lamp guide part, the lamp is attached from the front in the mounting direction. When the drop-off restricting portion is engaged, the lamp can be prevented from dropping off.

(6) The lamp holding component includes a mounting plate attached to the chassis and a rising portion that rises from the mounting plate, and the lamp gripping portion is connected to the rising portion. In this way, since the lamp can be held at a position floating from the chassis, the leakage current flowing through the chassis when the lamp is lit can be reduced.

(7) A pair of the lamp gripping portions are connected to the rising portion. Thus, the structure of the lamp holding component can be simplified by sharing the rising portion.

(8) Both the lamp gripping portions are open on the side opposite to the rising portion side, and the lamp guide portion is on the side opposite to the rising portion side from the opening end portions of the both lamp gripping portions. It is set as the structure each formed in the cantilever shape which protrudes. In this way, when the lamp is directed to the lamp guide during installation, the lamp guide is cantilevered and easily bent, so that the force for pushing the lamp in the vertical direction can be absorbed, and the installation work It can contribute to improvement of property.

(9) An optical member having translucency is disposed at a position separated from the lamp on the side opposite to the mounting plate side, and the rising portion is more than the lamp gripping portion. The optical member can be supported by protruding upward in the vertical direction. In this way, the function of supporting the optical member can be provided at the rising portion, and the structure of the lamp holding component can be simplified.

(10) The both lamp gripping portions are open to the rising portion side, and the lamp guide portions are formed by connecting the opening end portions of the both lamp gripping portions and the rising portion, respectively. The configuration. In this way, the part that connects both the lamp gripping parts to the rising part is also used by the lamp guide part, so the lamp holding part is connected to the lamp guide part as compared with the case where the connecting part is provided separately from the lamp guide part. Miniaturization can be achieved.

(11) The rising portion is provided with a partition portion that is positioned between the lamp gripping portions and partitions the attachment paths. In this way, the attachment path of both lamps can be partitioned by the partition portion, so that when one lamp is attached, it can be avoided that the lamp interferes with the other already attached lamp.

(12) An optical member having translucency is disposed at a position separated from the lamp on the side opposite to the mounting plate side, and the partition portion is more vertical than the lamp gripping portion. The optical member can be supported by projecting upward in the direction. In this way, the partition part can have a function of supporting the optical member, and the structure of the lamp holding component can be simplified.

(13) The lamp gripping portion is configured to open upward in the vertical direction in the installed state when using the display device illumination device. If it does in this way, in the installation state at the time of using the illuminating device for display apparatuses, a lamp | ramp can be hold | maintained to an attachment state firmly by a lamp holding part. Here, the “installation state when using the display device illumination device” means a state in which the display device illumination device is assembled so that the lamp can be turned on.

(14) In the lamp holding component including a mounting plate attached to the chassis, an opening end portion of the lamp gripping portion is connected to the mounting plate, and the mounting plate forms the lamp guide portion. The configuration. In this case, since the mounting plate also serves as the lamp guide portion, the structure of the lamp holding component can be simplified as compared with the case where the lamp guide portion is installed separately from the mounting plate.

(15) The lamp gripping portion is formed integrally with the chassis, and the wall surface of the chassis forms the lamp guide portion. In this way, the structure can be simplified.

  Next, in order to solve the above-described problem, a display device of the present invention includes the display device illumination device described above and a display panel that performs display using light from the display device illumination device. It is characterized by that. According to such a display device, it is possible to easily detect a mounting failure of the lamp in the lighting device for display device, and it is excellent in assembling workability, so that the manufacturing cost can be reduced.

  As the display panel, a liquid crystal panel can be exemplified. Such a display device can be applied as a liquid crystal display device to various uses, for example, a desktop screen of a television or a personal computer, and is particularly suitable for a large screen.

  According to the present invention, it is possible to easily detect a lamp mounting failure.

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. In the first embodiment, a liquid crystal display device D is illustrated as a display device. In the following description, the vertical direction and the horizontal direction when the cold cathode tube 15 is attached are based on FIGS.

  The liquid crystal display device D has a horizontally long rectangular (rectangular) shape as a whole, and as shown in FIG. 3, the back side of the liquid crystal panel 11 which is a display panel capable of displaying an image (the lower side and the rear side shown in FIGS. A backlight 10 which is an external light source (illuminating device) capable of irradiating light toward the liquid crystal panel 11 is arranged on the side), and both 10 and 11 are assembled by a bezel 12 covered from the front side of the liquid crystal panel. Retained. The liquid crystal display device D can be applied to a television receiver TV. As shown in FIG. 1, the television receiver TV includes a liquid crystal display device D, front and back cabinets Ca and Cb that are accommodated so as to sandwich the liquid crystal display device D, a power source P, a tuner T, and a stand S. Composed.

  As shown in FIG. 3, the liquid crystal panel 11 has a well-known structure in which liquid crystal, which is a substance whose optical characteristics change with voltage application, is sealed in a gap between a transparent TFT substrate and a transparent CF substrate. The TFT substrate is provided with a TFT (Thin Film Transistor) as a switching element connected to the source wiring and the gate wiring orthogonal to each other, and the CF substrate has red (R), green (G), blue (B ) Three color filters are arranged in a matrix. In addition, polarizing plates are attached to the surfaces of both substrates opposite to the liquid crystal side.

  The backlight 10 includes a chassis 13 having an open surface on the front side (the upper side shown in FIGS. 3 to 5, the liquid crystal panel 11 side, the front side), and a reflection sheet 14 laid in the chassis 13. A plurality of cold cathode fluorescent lamps 15 (tubular lamps) housed in the chassis 13, an optical member 16 disposed between the cold cathode fluorescent lamps 15 and the liquid crystal panel 11, and the optical member 16 can be positioned. And a plurality of lamp clips 20 (lamp holding parts) capable of holding the cold cathode tubes 15. The backlight 10 is a so-called direct type in which a plurality of cold-cathode tubes 15 face each other in parallel with the back side of the liquid crystal panel 11.

  The chassis 13 is made of metal and, as shown in FIG. 2, is formed in a shallow, substantially box shape having a rectangular shape in plan view with an opening on the front side. The operation of attaching and removing each component such as the cold cathode tube 15 to the chassis 13 (detachment operation) is performed with the bottom plate 13a of the chassis 13 in a substantially horizontal posture, and each component is a surface on the front side of the chassis 13. It is taken in and out along the substantially vertical direction through the opening part formed in this.

  The reflection sheet 14 is made of a synthetic resin, and the surface is a white color such as white having excellent reflectivity. The reflection sheet 14 covers almost the entire area along the inner surface of the chassis 13 as shown in FIG. It is laid and integrated to form the wall surface of the chassis 13. With this reflection sheet 14, light emitted from each cold cathode tube 15 can be guided to the opening portion side of the chassis 13.

  2 to 4, the cold cathode tube 15 is a kind of an elongated linear light source that extends in one direction along the surface direction of the bottom plate 13 a of the chassis 13 and the optical member 16. It is attached in the chassis 13 in a posture matched with the long side direction. A plurality of the cold cathode tubes 15 are arranged in a state where their axes are substantially parallel to each other and a predetermined interval is provided between them. The intervals (pitch, distance) between adjacent cold cathode tubes 15 are substantially equal.

  The cold-cathode tube 15 has a circular cross section and is configured such that mercury or the like is enclosed in an elongated glass tube, a phosphor is applied to the inner wall surface, and electrodes are enclosed at both ends. The cold cathode tube 15 has a tube diameter of about several millimeters, whereas the tube length is about several tens of centimeters to 1.5 meters, and is very elongated as a whole, and the glass tube can be elastically deformed. . Rubber holders 21 attached to the chassis 13 are fitted into the non-light emitting portions at both ends of the cold cathode tube 15. The rubber holder 21 can be fitted into a hole formed in the bottom plate 13a or the reflection sheet 14 of the chassis 13, and one end of the lead wire drawn out from the hole 13 is connected to an inverter board (not shown) on the back side of the chassis 13. Connection is possible. The other end of the lead wire is soldered to the electrode terminal of the cold cathode tube 15.

  As shown in FIGS. 3 and 4, the optical member 16 has a rectangular shape in plan view like the chassis 13 and the liquid crystal panel 11 and is made of a synthetic resin having translucency. By being attached, it is interposed between the cold cathode tube 15 group on the back side and the liquid crystal panel 11 on the front side. The optical member 16 includes a diffusion plate 16A, a diffusion sheet 16B, a lens sheet 16C, and a brightness enhancement sheet 16D that are sequentially stacked from the back side, and uniformly emits light emitted from each cold cathode tube 15 that is a linear light source. It has functions such as conversion to flat surface light. Among these, the diffuser plate 16A arranged on the backmost side has a sufficiently larger thickness dimension than the other sheets 16B to 16D, and relatively high rigidity is obtained.

  The positioning member constitutes a lamp holder 17 and a holder 18 that constitute a frame-shaped receiving member that receives the outer peripheral end of the optical member 16 on the back side, and a frame-shaped pressing member that presses the outer peripheral end of the optical member 16 from the front side. Frame 19.

  The lamp holders 17 are made of a synthetic resin having a white color such as a white surface. As shown in FIGS. 2 and 3, the lamp holders 17 are attached to both end positions in the long side direction of the chassis 13 as well as the short of the chassis 13. It is set as the form extended along a side direction. The lamp holder 17 has a substantially box shape with an open back side so that the rubber holders 21 attached to the cold cathode tubes 15 can be collectively covered from the front side. A receiving portion 22 capable of receiving the optical member 16 is formed in a stepped shape at the inner peripheral end portion of the front side surface of the lamp holder 17.

  The holders 18 are made of a synthetic resin having a white color such as a white surface, and as shown in FIGS. 2 and 4, a pair of holders 18 are attached to both ends in the short side direction of the chassis 13, and the long sides of the chassis 13 It is the form extended along a direction. As with the lamp holder 17, a receiving portion 23 for the optical member 16 is formed in a stepped shape at the inner peripheral end of the front side surface of the holder 18.

  The frame 19 is made of metal and formed into a frame shape, and as shown in FIGS. 3 and 4, the outer peripheral end of the optical member 16 can be pressed from the front side over substantially the entire periphery. The frame 19 has a pressing surface facing the plate surface of the optical member 16 at the inner peripheral end thereof. In the assembled state, the pressing surface is arranged at a position with a slight clearance with respect to the front plate surface of the frontmost luminance enhancing sheet 16D, whereby the optical member 16 is thermally expanded. It is allowed to heat shrink.

  As shown in FIG. 2, a plurality of lamp clips 20 are installed in a distributed manner on the bottom plate 13a of the chassis 13, and the arrangement thereof is zigzag (alternate, staggered). As shown in FIG. 5, the lamp clip 20 includes an attachment plate 24 attached to the chassis 13, a pair of locking portions 25 protruding from the attachment plate 24 to the back side, and the attachment plate 24 to the front side (optical member 16 side). The rising portion 26 is configured to rise, and the lamp holding portion 27 is connected to the rising portion 26 and can hold the cold cathode tube 15. The lamp clip 20 is made of synthetic resin, and the entire surface has a white color such as white having excellent light reflectivity.

  The mounting plate 24 has an elongated plate shape extending along the short side direction of the bottom plate 13a of the chassis 13 (direction perpendicular to the axial direction of the cold cathode tube 15). The mounting plate 24 is mounted in a state where it is addressed to the reflection sheet 14 that forms the wall surface of the chassis 13.

  A pair of locking portions 25 are installed side by side on the back surface of the mounting plate 24. As the mounting plate 24 is mounted, the locking portion 25 is passed through the mounting hole H provided in the chassis 13 and the reflection sheet 14 and can be elastically locked to the hole edge on the back side. . As a result, the support component 20 is held attached to the chassis 13.

  The rising portion 26 has a pin shape that protrudes from the approximate center in the length direction of the mounting plate 24 to the front side. The rising portion 26 has a circular cross-sectional shape along the horizontal direction, and is formed in a tapered shape having a diameter that decreases toward the tip, and is formed in a substantially conical shape as a whole. The rising portion 26 has a height that protrudes to the front side from the lamp gripping portion 27 described below, and the tip portion thereof can support the diffusion plate 16A of the optical member 16 from the back side. (See FIGS. 3 and 4). The tip of the rising portion 26 is rounded.

  A pair of lamp gripping portions 27 are connected to the rising portion 26. Specifically, the lamp gripping portion 27 is connected to a midway position in the length direction of the rising portion 26 (a position between the root and the tip) via a connecting portion 28. As a result, the lamp gripping portion 27 is supported at a position lifted from the mounting plate 24 by a predetermined height. Both connecting portions 28 are respectively connected to positions on the outer peripheral surface of the rising portion 26 that face opposite sides, that is, positions that are separated by an angular interval of approximately 180 degrees. Thereby, both the connection parts 28 and both the lamp holding parts 27 protrude toward the opposite side from the rising part 26 and are arranged on a straight line (see FIG. 2). The connecting portion 28 is substantially parallel to the mounting plate 24, and supports the lamp gripping portion 27 at a position spaced from the rising portion 26 by a predetermined distance in the length direction of the mounting plate 24. Therefore, the lamp clip 20 can hold the cold cathode tubes 15 at two positions across the rising portion 26.

  The lamp gripping portion 27 has an end ring shape surrounding the cold cathode tube 15. Specifically, the lamp gripping portion 27 is formed with an opening 29 for allowing the cold cathode tube 15 to be attached and detached at a part of the annular body along the outer peripheral surface of the cold cathode tube 15. The opening width 29 is set smaller than the outer diameter of the cold cathode tube 15. The lamp gripping portion 27 can be elastically deformed while the open end portions 27 a are being brought into contact with and separated from (opening and closing) as the cold cathode tube 15 is attached and detached through the opening 29. By engaging with the cold-cathode tube 15 attached to the normal depth while projecting inward (in the direction of narrowing the opening width of the opening 29) to both opening end portions 27a of the lamp gripping portion 27, A retaining portion 30 is provided that can retain the cold cathode tube 15.

  The lamp gripping portion 27 has a substantially C-shape that opens laterally along the horizontal direction when viewed from the front. The opening direction is a work for attaching and detaching the cold cathode tube 15 to the chassis 13. It coincides with the direction orthogonal (crossing) to the vertical direction when performing. Therefore, when the cold cathode tube 15 is attached to the lamp gripping portion 27, the cold cathode tube 15 is substantially along the vertical direction until the cold cathode tube 15 is aligned with the opening 29 of the lamp gripping portion 27 through the opening portion of the chassis 13. Thus, the cold cathode tube 15 is moved along the horizontal direction until the cold cathode tube 15 is attached to the lamp gripping portion 27 through the opening 29. That is, the mounting path of the cold cathode tube 15 is a substantially L-shaped path (a path bent in the middle) in which the path along the vertical direction and the path along the horizontal direction are combined.

  Each lamp gripping portion 27 opens toward the side opposite to the rising portion 26 side, and the two lamp gripping portions 27 connected to the rising portion 26 open in opposite directions. Accordingly, the two cold-cathode tubes 15 attached to one lamp clip 20 are moved in a direction approaching each other along the horizontal direction at the time of attachment, and are moved in directions away from each other at the time of removal.

  Of the two opening end portions 27a of the lamp gripping portion 27, the lower (shown in the vertical direction during mounting operation) opening end portion 27a shown in FIG. 31 is integrally formed. Specifically, the lamp guide portion 31 extends outward from the opening end portion 27a of the lamp gripping portion 27 in the horizontal direction (on the side opposite to the rising portion 26 side), and the extending direction is the lamp gripping portion. This coincides with the opening direction of the portion 27. Therefore, when the cold cathode tube 15 is attached to the lamp gripping portion 27, the cold cathode tube 15 may be pushed straight along the lamp guide portion 31 while being addressed to the lamp guide portion 31. The lamp guide portion 31 is formed in a cantilever shape having a base end as a connection portion with the opening end portion 27 a of the lamp grip portion 27. Thereby, the lamp guide part 31 can be elastically deformed in a direction intersecting the horizontal direction that is the extending direction. The lamp guide portion 31 is formed with the above-described retaining portion 30 straddling from the opening end portion 27 a side of the lamp gripping portion 27.

  At the free end portion (extending end portion) of the lamp guide portion 31, a drop-off restricting portion 32 that can restrict the drop-out of the cold cathode tube 15 is provided. Specifically, the drop-off restricting portion 32 is configured by an inclined wall that rises obliquely upward in the vertical direction from the distal end side of the lamp guide portion 31. As shown by the one-dot chain line in FIG. Is possible. As a result, the cold cathode tube 15 can be prevented from falling off the lamp guide portion 31.

  The liquid crystal display device D having the above-described configuration is manufactured as follows. The liquid crystal display device D is manufactured by separately manufacturing the liquid crystal panel 11 and the backlight 10 and assembling them together using the bezel 12 or the like. Next, a method for assembling the backlight 10 will be described.

  First, the chassis 13 is placed on a work table (not shown) and the bottom plate 13a is set to a substantially horizontal posture. In this state, after the reflection sheet 14 is laid and integrated in the chassis 13, the lamp clip 20 is attached to the bottom plate 13 a of the chassis 13. Then, the operation | work which attaches the cold cathode tube 15 of the state which attached the rubber holder 21 to both ends is performed. In addition, the worker performs these attachment operations while looking down the chassis 13 from the upper side in the vertical direction.

  The cold cathode tube 15 is moved substantially downward in the vertical direction from the position indicated by the two-dot chain line in FIG. 5, the cold cathode tube 15 is brought into contact with the lamp guide portion 31 so that the cold cathode tube 15 is aligned in the vertical direction with respect to the opening 29 of the lamp gripping portion 27. The At this time, even when the cold cathode tube 15 is pushed excessively downward in the vertical direction, the cantilever-shaped lamp guide portion 31 is bent and deformed so that the cold cathode tube 15 can be pushed without damaging it. Can be absorbed. Even in this case, the cold-cathode tube 15 is always kept in the positioning state with respect to the opening 29. When the cold cathode tube 15 is straightly pushed toward the lamp gripper 27 along the lamp guide portion 31 defining the attachment path from the state where the cold cathode tube 15 is aligned with the opening 29, the cold cathode tube 15 smoothly passes through the opening 29 while elastically expanding and deforming the lamp gripping portion 27.

  Then, as shown by the solid line in FIG. 5, when the cold cathode tube 15 is pushed to the normal depth, the lamp gripper 27 is restored to a shape in which almost the entire inner peripheral surface abuts on the outer peripheral surface of the cold cathode tube 15. At the same time, the retaining portion 30 is engaged with the cold cathode tube 15 from the front side in the mounting direction to prevent the retaining portion 30 from coming off. In this mounted state, the cold cathode tube 15 gripped by the lamp gripping portion 27 is supported at a height position where the lamp gripping portion 27 is lifted from the mounting plate 24 by the amount lifted by the rising portion 26. One cold-cathode tube 15 is gripped by the lamp gripping portion 27 at three or four positions separated from each other in the axial direction (see FIG. 2). The rubber holders 21 at both ends of the cold cathode tube 15 are attached to the chassis 13 while bending the elongated cold cathode tube 15.

  By the way, when performing this mounting operation, the mounting depth of the cold cathode tube 15 with respect to the lamp gripping portion 27 is insufficient, or the pushing operation is forgotten with the cold cathode tube 15 placed on the lamp guide portion 31. May occur. Even in that case, since the lamp gripper 27 is open in the horizontal direction perpendicular to the vertical direction during the mounting operation, the cold-cathode tube 15 whose mounting depth is insufficient is shown by a two-dot chain line in FIG. From the normal mounting position (the position indicated by the solid line in FIG. 6), it is arranged so as to protrude (displace) outward in the horizontal direction, that is, toward the front side in the mounting direction, by an amount corresponding to the insufficient mounting depth. Therefore, it is easy for a worker who is working while looking down at the chassis 13 from the upper side in the vertical direction to visually detect the cold cathode tube 15 that is not sufficiently attached, and thus the cold cathode tube 15 that is insufficiently attached is overlooked. Is prevented. When such a cold cathode tube 15 is found, the operator pushes the cold cathode tube 15 to a proper mounting depth. The inspection operation of the cold cathode tube 15 may be performed simultaneously with the mounting operation or may be performed separately after the mounting operation.

  After performing the operation of attaching the cold cathode tube 15 as described above, the lamp holder 17 and the holder 18 are attached in the chassis 13. Then, the optical member 16 is placed on the receiving portions 22 and 23 of the lamp holder 17 and the holder 18 in the order of the diffusion plate 16A, the diffusion sheet 16B, the lens sheet 16C, and the brightness enhancement sheet 16D. Then, the optical member 16 is positioned by attaching the frame 19. As described above, the assembly of the backlight 10 is completed.

  By the way, even if each cold-cathode tube 15 is normally attached to each lamp gripper 27 in the above-described mounting operation, the liquid crystal display device D (backlight 10) is transported or used during use. Due to the influence of vibration and impact, there is a possibility that the cold cathode tube 15 is displaced from the normal mounting state to the front side in the mounting direction, that is, the drop-off direction. Even if such a situation occurs, the displaced cold-cathode tube 15 is placed on the lamp guide portion 31 (shown by the one-dot chain line in FIG. 5). Engage. Thereby, the situation where the cold cathode tube 15 falls off from the state of being placed on the lamp guide portion 31 is prevented. In addition, in this state, the height position of the cold cathode tube 15 is almost the same as the normal mounting state, and the distance between the cold cathode tube 15 and the optical member 16 or the liquid crystal panel 11 does not change (almost the same). Therefore, it is possible to avoid a situation in which a display defect occurs in the liquid crystal display device D.

  As described above, according to the present embodiment, the lamp gripper 27 is opened in a direction that intersects the vertical direction when the cold cathode tube 15 is attached. When the mounting depth is insufficient at the time of mounting, the cold cathode tube 15 protrudes from the normal mounting position in a direction intersecting the vertical direction during the mounting operation by the shortage. Thereby, the attachment defect of the cold cathode tube 15 can be easily detected visually. Therefore, the mounting workability can be improved. Moreover, since the lamp gripper 27 is opened in the direction perpendicular to the vertical direction, it is possible to more easily detect that the mounting depth of the cold cathode tube 15 is insufficient.

  Further, since the lamp guide portion 31 that defines an attachment path when the cold cathode tube 15 is attached to the lamp gripping portion 27 is provided, by moving the cold cathode tube 15 along the lamp guide portion 31, Installation work can be performed smoothly. As a result, the mounting depth of the cold cathode tube 15 is less likely to occur.

  In addition, since the lamp guide portion 31 is integrally formed with the lamp clip 20 having the lamp gripping portion 27 attached to the chassis 13, if the lamp guide portion is installed on a part different from the lamp clip 20, As compared to the case where an assembling error may occur between the component and the lamp clip 20, such an assembling error can be avoided and a smooth mounting operation can be expected.

  Further, since the lamp guide portion 31 is formed at the opening end portion 27 a of the lamp gripping portion 27 and extends along the opening direction, the cold cathode tube 15 is straightened along the lamp guide portion 31. The cold cathode tube 15 can be attached to the lamp gripping portion 27 by pushing it in, so that the attaching operation can be made smoother.

  In addition, the lamp clip 20 is provided with a drop-off restricting portion 32 that engages with the cold cathode tube 15 placed on the lamp guide portion 31 from the front side in the mounting direction. Even if the cold-cathode tube 15 that is normally attached to the cold-cathode tube 15 comes off due to the influence of vibration or the like and is placed on the lamp guide portion 31, the drop-off restricting portion 32 is attached to the cold-cathode tube 15 from the front side in the attachment direction. By engaging, the cold cathode tube 15 can be prevented from falling off.

  In addition, the lamp clip 20 includes a mounting plate 24 attached to the chassis 13 and a rising portion 26 that rises from the mounting plate 24, and a lamp gripping portion 27 is connected to the rising portion 26. The tube 15 can be held at a position floating from the chassis 13, and the leakage current flowing through the chassis 13 when the cold cathode tube 15 is turned on can be reduced.

  In addition, since the ramp gripping portion 27 is connected to the rising portion 26 in a pair, the rising portion 26 can be shared and the structure of the lamp clip 20 can be simplified.

  Further, in the case where the pair of lamp gripping portions 27 are connected back to back with respect to one rising portion 26, both the lamp gripping portions 27 are open on the side opposite to the rising portion 26 side, and the lamp guide portion 31 are formed in a cantilever shape projecting from the open end portions 27a of both lamp gripping portions 27 to the side opposite to the rising portion 26 side, so that the cold-cathode tube 15 is directed to the lamp guide portion 31 during mounting. In this case, the lamp guide portion 31 is cantilevered and easily bent, so that the force for pushing the cold cathode tube 15 in the vertical direction can be absorbed, which can contribute to improvement in mounting workability.

  Further, since the rising portion 26 protrudes upward in the vertical direction from the lamp gripping portion 27 and can support the optical member 16 and also has a function of supporting the optical member 16, the structure of the lamp clip 20 is simplified. Can be achieved.

<Embodiment 2>
A second embodiment of the present invention will be described with reference to FIG. In this Embodiment 2, what changed the shape of the lamp clip is shown. In the second embodiment, redundant description of the same structure, operation, and effects as those of the first embodiment will be omitted.

  In the lamp clip 33, as shown in FIG. 7, a pair of lamp gripping portions 36 are connected to a rising portion 35 that rises from the front surface of the mounting plate 34 via a lamp guide portion 37. Specifically, the lamp gripping portion 36 opens inward along the horizontal direction (direction perpendicular to the vertical direction during the mounting operation), that is, opens to the rising portion 35 side, and the opening direction is the above-described first embodiment. It is the opposite direction. Therefore, both the lamp gripping portions 36 are open toward the other lamp gripping portion 36 side.

  The lamp guide portion 37 extends inward along the horizontal direction that is the opening direction from the opening end portion 36 a on the lower side in the vertical direction in the lamp gripping portion 36, and the extending end portion is connected to the rising portion 35. Has been. Accordingly, the two cold-cathode tubes 15 attached to the lamp clip 33 are moved in a direction away from each other along the horizontal direction when attached, and are moved in directions closer to each other when removed. That is, the moving direction of the cold cathode tube 15 in the horizontal direction in the lamp guide portion 37 is opposite to that in the first embodiment. Both the lamp gripping portions 36 and both the lamp guide portions 37 are connected to a position at an angular interval of about 180 degrees with respect to the rising portion 35 and are arranged in a substantially straight line.

  The rising portion 35 protrudes further upward in the vertical direction than both the lamp guide portions 37, and this protruding portion serves as a partition portion 38 that partitions the attachment paths of the cold cathode tubes 15 with respect to the both lamp gripping portions 36. . The partition portion 38 is located between the two lamp gripping portions 36, and the mounting path of the cold cathode tube 15 in the other lamp gripping portion 36 is independent from the mounting route of the cold cathode tube 15 in the one lamp gripping portion 36. Thus, it is possible to avoid the cold cathode tubes 15 attached to each other from interfering with each other. The partition portion 38 protrudes further upward in the vertical direction than the lamp gripping portion 36, and can support the optical member 16 (not shown) from the back side by the tip portion.

  On the outer peripheral surface of the partition portion 38, a pair of drop-out restricting portions 39 that are engaged with the cold cathode tubes 15 mounted on the lamp guide portions 37 from the front side in the mounting direction are provided. The drop-out restricting portion 39 is formed in a protruding shape that protrudes from the outer peripheral surface of the partition portion 38 toward the lamp gripping portion 36 side while narrowing the attachment path of the cold cathode tube 15. The drop-off restricting portion 39 is installed in the partition portion 38 at substantially the same height as the retaining portion 40 provided at the opening end portion 36a on the upper side in the vertical direction of the lamp gripping portion 36. The drop-off restricting portion 39 can be engaged with the cold-cathode tube 15 placed on the lamp guide portion 37 from above in the vertical direction, whereby the cold-cathode tube 15 is displaced in the same direction and drops off. Can be prevented.

  When the cold cathode tube 15 is attached to the lamp clip 33, the cold cathode tube 15 is moved vertically downward from the position indicated by the two-dot chain line in FIG. The cold cathode tube 15 is passed between the partition portion 38 and the partition portion 38, and the cold cathode tube 15 is brought into contact with the lamp guide portion 37 as shown by a one-dot chain line in FIG. From this state, the cold-cathode tube 15 is moved horizontally outward (on the side opposite to the rising portion 35 side) along the lamp guide portion 37, and the lamp gripping portion 36 is elastically expanded and deformed to open the opening. Pass through part 41. When the cold cathode tube 15 reaches the proper mounting depth, the lamp gripping portion 36 is restored until almost the entire inner peripheral surface thereof is in contact with the outer peripheral surface of the cold cathode tube 15. Accordingly, the cold cathode tube 15 is held in the attached state by the lamp gripping portion 36. If there is a cold cathode tube 15 with insufficient mounting depth during this mounting operation, the cold cathode tube 15 protrudes in the horizontal direction from the normal mounting position by the amount of insufficient mounting depth (FIG. 7). For a worker who is working looking down from the upper side in the vertical direction, it can be easily detected by visual observation.

  As described above, according to the present embodiment, in the case where the pair of lamp gripping portions 36 are connected back to back with respect to one rising portion 35, both lamp gripping portions 36 open to the rising portion 35 side. Since the lamp guide portion 37 is formed by connecting the opening end portion 36a of the both lamp gripping portions 36 and the rising portion 35, respectively, the both lamp gripping portions 36 are connected to the rising portion 35. The portion is shared by the lamp guide portion 37, and the lamp clip 33 can be downsized as compared with the case where the connecting portion is separately provided as in the first embodiment.

  In addition, since the start-up portion 35 is provided with a partition portion 38 that is positioned between the lamp gripping portions 36 and partitions the attachment paths, when the one cold cathode tube 15 is attached, the cold cathode tube 15 is provided. Interference with the other cold-cathode tube 15 already attached can be avoided.

  Further, since the partition portion 35 protrudes vertically upward from the lamp gripping portion 36 and can support the optical member 16 and has a function of supporting the optical member 16, the structure of the lamp clip 33 can be simplified. Can be planned.

<Embodiment 3>
A third embodiment of the present invention will be described with reference to FIG. In the third embodiment, the lamp clip is further changed in shape. In the third embodiment, the same description as in the first and second embodiments is omitted. Further, the right side shown in FIG. 8 is the upper side in the vertical direction in the installation state when the liquid crystal display device (backlight) is used.

  In the lamp clip 42, as shown in FIG. 8, a pair of raised portions 44 rises from the mounting plate 43 to the front side, and a lamp gripping portion 45 is connected to each raised portion 44. Specifically, the rising portions 44 are respectively installed on the mounting plate 43 at positions spaced apart from each other in the length direction. An opening end 45a on the lower side in the vertical direction of the lamp gripping portion 45 is connected to the tip surface of the rising portion 44.

  Both lamp gripping portions 45 are open in the same direction (rightward as shown in FIG. 8) along the horizontal direction (direction perpendicular to the vertical direction during the mounting operation). The opening direction of the lamp gripping part 45 coincides with the upper side in the vertical direction in the installation state when the liquid crystal display device D (backlight 10) is used. A lamp guide portion 46 is formed to extend from the opening end portion 45a on the lower side in the vertical direction of each lamp gripping portion 45 along the horizontal direction that is the opening direction. The lamp guide portion 46 is formed in a cantilever shape with the opening end 45 a of the lamp gripping portion 45 as a base end.

  When the cold cathode tube 15 is attached to the lamp clip 42, the cold cathode tube 15 is moved downward in the vertical direction from the position shown by the two-dot chain line in FIG. 8, and as shown by the one-dot chain line in FIG. Is brought into contact with the lamp guide portion 46. From this state, the cold cathode tube 15 is moved to the left as shown in FIG. 8 along the lamp guide portion 46, and the lamp gripping portion 45 is passed through the opening portion 47 while being elastically expanded and deformed. When the cold cathode tube 15 reaches the proper mounting depth, the lamp gripping portion 45 is restored until almost the entire inner peripheral surface thereof is in contact with the outer peripheral surface of the cold cathode tube 15. Accordingly, the cold cathode tube 15 is held in the attached state by the lamp gripping portion 45. Since the attachment paths of the cold cathode tubes 15 are all the same, the attachment workability is good. Also in the lamp clip 42, as in the first and second embodiments, the cold cathode tube 15 having an insufficient mounting depth can be easily detected visually.

  As described above, according to the present embodiment, each lamp gripping portion 45 is opened upward in the vertical direction in the installation state when the liquid crystal display device D (backlight 10) is used. Even if vibrations or shocks are applied, the cold cathode tube 15 is unlikely to fall off the lamp gripping portion 45, and the cold cathode tube 15 can be securely held in the mounted state.

<Embodiment 4>
A fourth embodiment of the present invention will be described with reference to FIG. In the fourth embodiment, the lamp clip is omitted from the rising portion. In the fourth embodiment, the description of the same structure, operation, and effect as those of the first to third embodiments is omitted.

  In the lamp clip 48, as shown in FIG. 9, a pair of lamp gripping portions 50 are directly connected to the mounting plate 49. Specifically, the lamp gripping portion 50 has an arc shape along the outer peripheral surface of the cold cathode tube 15 and is raised from the mounting plate 49 so that the inner peripheral surface thereof faces the front surface of the mounting plate 49. Yes. An opening 51 is formed between the tip of the lamp gripping portion 50 and the mounting plate 49, and the cold cathode tube 15 mounted through the opening 51 is sandwiched between the lamp gripping portion 50 and the mounting plate 49. It is supposed to be held at. That is, the mounting plate 49 constitutes a part of the lamp grip portion 50. At the tip end portion (opening end portion) of the lamp gripping portion 50, a retaining portion 52 that engages with the attached cold cathode tube 15 from the outside is provided. A similar retaining portion 52 is provided in a protruding manner at a position of the mounting plate 49 that faces the retaining portion 52.

  A portion of the mounting plate 49 that is closer to the mounting direction than the retaining portion 52 (on the right side in FIG. 9) forms a lamp guide portion 53 that defines the mounting path of the cold cathode tube 15. The lamp guide portion 53 is configured to extend along a horizontal direction that is the opening direction of the opening 51 of the lamp gripping portion 50. By pushing the cold cathode tube 15 straight along the lamp guide portion 53, the attachment work to the lamp gripping portion 50 can be easily performed.

  As described above, according to the present embodiment, the opening end of the lamp gripping portion 50 is connected to the mounting plate 49, and the mounting plate 49 also serves as the lamp guide portion 53. Compared with the case where a lamp guide part is separately installed, the structure of the lamp clip 48 can be simplified.

<Embodiment 5>
A fifth embodiment of the present invention will be described with reference to FIG. In the fifth embodiment, a reflection sheet and a lamp clip are omitted. In the fifth embodiment, the description of the same structure, operation, and effect as those of the first to fourth embodiments is omitted.

  In the backlight 10, as shown in FIG. 10, the lamp clip is omitted and the lamp gripping portion 54 is formed integrally with the bottom plate 55 a of the chassis 55. The lamp holding portion 54 has an arc shape along the outer peripheral surface of the cold cathode tube 15 and is raised from the bottom plate 55a of the chassis 55, and the inner peripheral surface thereof faces the wall surface of the chassis 55 (bottom plate 55a). . An opening 56 is formed between the tip of the lamp gripping portion 54 and the chassis 55, and the cold cathode tube 15 attached through the opening is held in a state of being sandwiched between the lamp gripping portion 54 and the chassis 55. It has come to be. That is, the chassis 55 constitutes a part of the lamp grip portion 54.

  A portion of the chassis 55 that is closer to the mounting direction than the lamp gripping portion 54 (on the right side in FIG. 10) constitutes a lamp guide portion 57 that defines the mounting path of the cold cathode tube 15. The lamp guide portion 57 is configured to extend along a horizontal direction that is an opening direction of the opening portion 56 of the lamp gripping portion 54. By pushing the cold cathode tube 15 straight along the lamp guide portion 57, the attachment work to the lamp gripping portion 54 can be easily performed. The wall surface of the chassis 55 and the outer peripheral surface of the lamp holding portion 54 are colored in a white color such as white having excellent light reflectivity. The material of the chassis 55 may be a synthetic resin material in addition to a metal material.

  As described above, according to the present embodiment, the lamp gripping portion 54 is formed integrally with the chassis 55, and the wall surface of the chassis 55 also serves as the lamp guide portion 57. Therefore, compared with the first to fourth embodiments, The structure can be simplified.

<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 each of the above-described embodiments, the lamp guide portion is exemplified. However, the lamp guide portion can be omitted. Specifically, when the lamp guide portion is omitted from the lamp clip described in the first embodiment, a configuration as shown in FIG. 11 is obtained, and such a configuration is also included in the present invention.

  (2) In each of the above-described embodiments, the case where the lamp gripper is opened in the horizontal direction orthogonal to the vertical direction has been described. However, the lamp gripping portion is inclined in the vertical direction, such as vertically upward or diagonally downward. The present invention includes a lamp gripping portion having an opening shape. In that case, the lamp guide part may be extended along the opening direction of the lamp gripping part (direction inclined with respect to the vertical direction).

  (3) In each of the embodiments described above, the case where the lamp guide portion extends along the opening direction of the opening portion of the lamp gripping portion has been shown. It may be a form extending in a perpendicular direction.

  (4) In each of the above-described embodiments, the case where the lamp guide portion is provided at the opening end portion of the lamp gripping portion has been described. However, the lamp guide portion may be installed at other locations in the lamp clip.

  (5) In the first to fourth embodiments described above, the lamp guide portion is integrally formed with the lamp clip. However, the lamp guide portion is provided on a part different from the lamp clip attached to the chassis. May be.

  (6) In the first and second embodiments described above, the case where the rising portion (partition portion) has the function of supporting the optical member has been shown. However, the height position of the rising portion (partition portion) is set to the ramp. The optical member support function may be omitted with the same degree as the grip portion.

  (7) In Embodiment 2 described above, the case where the rising portion functions as a partition portion that partitions the attachment paths of both cold-cathode tubes has been shown, but the height position of the rising portion is set to the same level as the lamp guide portion, You may abbreviate | omit the partition function of an attachment path | route.

  (8) As in Embodiments 3 and 4 described above, in the case where the rising portion is made independent for each lamp gripping portion, the number of the rising portions and the lamp gripping portions installed in the lamp clip is arbitrary (one or three). More than one).

  (9) In the above-described third embodiment, a drop-off restricting portion as described in the first embodiment may be installed at the extended end portion of the lamp guide portion.

  (10) In Embodiment 4 described above, it is possible to install a drop-off restricting portion on the mounting plate.

  (11) In the first to fourth embodiments described above, the case where the lamp clip is provided with the mounting plate is shown. However, even if the mounting plate is omitted by installing the engaging portion directly on the rising portion or the lamp gripping portion. Good.

  (12) In the first to fourth embodiments described above, the reflection sheet may be omitted, and the wall surface of the chassis may be colored in a white color such as white having excellent reflectivity.

  (13) In each of the embodiments described above, the lead wire is soldered to the terminal of the electrode installed at the end of the cold cathode tube, but the base connected to the electrode at the end of the cold cathode tube The base may be fitted and connected to a connector installed on the chassis side, and the connector may be connected to the inverter board.

  (14) In each of the above-described embodiments, the case where the color of the surface of the lamp clip or the reflection sheet (chassis) is white is exemplified. However, the color is not limited to white and may be other white color such as milky white. It is also possible to change. Moreover, it does not matter as colors other than white.

  (15) In each of the above-described embodiments, the case where a cold cathode tube is exemplified as the lamp is illustrated, but the present invention can also be applied to lamps having other types of tubes such as a hot cathode tube and a fluorescent tube.

  (16) In each of the above-described embodiments, the liquid crystal display device using the liquid crystal panel as the display panel has been exemplified. However, the present invention is applicable to display devices using other types of display panels.

  (17) In each of the above-described embodiments, the television receiver provided with the tuner is exemplified. However, the present invention can also be applied to a display device that does not include the tuner.

The exploded view showing the outline of the television receiver which concerns on Embodiment 1 of this invention. Top view of backlight AA line sectional view of FIG. BB sectional view of FIG. Enlarged front view showing cold cathode tube mounting operation An enlarged plan view showing the position of the cold cathode tube according to the installation situation The enlarged front view of the lamp clip which concerns on Embodiment 2 of this invention The enlarged front view of the lamp clip which concerns on Embodiment 3 of this invention The enlarged front view of the lamp clip which concerns on Embodiment 4 of this invention The expanded sectional view of the chassis concerning Embodiment 5 of the present invention. The enlarged front view of the lamp clip concerning (1) of other embodiments

Explanation of symbols

10 ... Backlight (lighting device for display device)
11 ... Liquid crystal panel (display panel)
13, 55 ... Chassis 15 ... Cold cathode tube (lamp)
16 ... Optical member 20, 33, 42, 48 ... Lamp clip (lamp holding part)
24, 34, 43, 49 ... Mounting plate 26, 35, 44 ... Rising portion 27, 36, 45, 50, 54 ... Lamp gripping portion 27a, 36a, 48a ... Open end 31, 37, 46, 53, 57 ... Lamp guide part 32,39 ... Drop-off restricting part 38 ... Partition part D ... Liquid crystal display device

Claims (19)

A lamp having a tubular shape, a chassis in which a plurality of the lamps are accommodated in a parallel state, and a lamp gripping portion that forms an end ring surrounding the peripheral surface of the lamp and can grip the lamp,
The lamp gripping unit is an illumination device for a display device that is open in a direction intersecting with a vertical direction during the lamp mounting operation. The illumination device for a display device according to claim 1, wherein the lamp gripper is opened in a direction orthogonal to a vertical direction when the lamp is attached. The illumination device for a display device according to claim 1, further comprising a lamp guide portion that defines an attachment path when the lamp is attached to the lamp gripping portion. The lighting device for a display device according to claim 3, wherein a lamp holding part having the lamp gripping part is attached to the chassis, and the lamp guide part is integrally formed with the lamp holding part. The illumination device for a display device according to claim 4, wherein the lamp guide portion is formed at an opening end portion of the lamp gripping portion and extends along an opening direction thereof. The illumination device for a display device according to claim 5, wherein the lamp holding component is provided with a drop-out restricting portion that engages with the lamp in a state of being mounted on the lamp guide portion from the front side in the mounting direction. The lamp holding part includes a mounting plate attached to the chassis and a rising portion rising from the mounting plate, and the lamp gripping portion is connected to the rising portion. A lighting device for a display device according to claim 1. The lighting device for a display device according to claim 7, wherein a pair of the lamp gripping portions are connected to the rising portion. The both lamp gripping portions are open to the side opposite to the rising portion side, and the lamp guide portion protrudes from the opening end of the both lamp gripping portions to the side opposite to the rising portion side. The illumination device for a display device according to claim 8, wherein the illumination device is formed in a cantilever shape. In a position separated from the lamp on the side opposite to the mounting plate side, an optical member having translucency is disposed.
The lighting device for a display device according to claim 9, wherein the rising portion protrudes upward in the vertical direction from the lamp gripping portion and can support the optical member. The both lamp gripping portions are open to the rising portion side, and the lamp guide portions are formed by connecting open end portions of the both lamp gripping portions and the rising portion, respectively. 9. A lighting device for a display device according to 8. The lighting device for a display device according to claim 11, wherein the rising portion is provided with a partition portion that is positioned between the both lamp gripping portions and partitions the attachment paths. In a position separated from the lamp on the side opposite to the mounting plate side, an optical member having translucency is disposed.
The illumination device for a display device according to claim 12, wherein the partition portion protrudes upward in the vertical direction from the lamp gripping portion and can support the optical member. The lighting device for a display device according to any one of claims 1 to 8, wherein the lamp gripper is opened upward in a vertical direction in an installed state when the lighting device for the display device is used. In the lamp holding component comprising a mounting plate attached to the chassis,
The lighting device for a display device according to any one of claims 4 to 6, wherein an opening end portion of the lamp gripping portion is connected to the mounting plate, and the mounting plate forms the lamp guide portion. . The lighting device for a display device according to claim 3, wherein the lamp gripping portion is integrally formed with the chassis, and a wall surface of the chassis forms the lamp guide portion. A display device comprising: the display device illumination device according to any one of claims 1 to 16; and a display panel disposed on a front side of the display device illumination device. The display device according to claim 17, wherein the display panel is a liquid crystal panel in which liquid crystal is sealed between a pair of substrates. A television receiver comprising the display device according to claim 17 or 18.

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