WO2012005065A1

WO2012005065A1 - Illumination device, display device, and television receiver device

Info

Publication number: WO2012005065A1
Application number: PCT/JP2011/062074
Authority: WO
Inventors: 達朗黒田
Original assignee: シャープ株式会社
Priority date: 2010-07-07
Filing date: 2011-05-26
Publication date: 2012-01-12

Abstract

Provided is an illumination device in which a substrate cover can be attached easily. The disclosed illumination device includes: a cold-cathode tube (17); a chassis (14) in which the cold-cathode tube (17) is housed; a control substrate (40) that is attached to the base plate (14a) of the chassis (14); and a substrate cover (60) that is attached to the base plate (14a) and that is arranged so as to cover the control substrate (40). The illumination device is characterized in that: the base plate (14a) has a projection (52) that projects toward the substrate cover (60); and the projection (52) supports the substrate cover (60) when the chassis (14) is installed in a state such that the plate surface (14a1) of the base plate (14a) is arranged along the vertical direction.

Description

Lighting device, display device, and television receiver

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

Conventionally, since a liquid crystal panel used for a liquid crystal display device such as a liquid crystal television does not emit light spontaneously, a backlight device is separately provided as a lighting device. This backlight device is well known to be installed on the back side of the liquid crystal panel (opposite to the display surface). The backlight device is installed on the inner surface of the bottom plate of the chassis and the chassis having a shape opened on the liquid crystal panel side. A plurality of light sources (for example, cold-cathode tubes and LEDs), and an optical member (such as a diffusion plate) that is arranged to cover the opening of the chassis and efficiently emits light emitted from the light sources to the liquid crystal panel side. And a light reflection sheet that is laid in the chassis and reflects light from the light source toward the optical member and the liquid crystal panel.

Also, it is known that a circuit board for driving a liquid crystal display device is attached to the chassis, and a board cover is attached so as to cover the circuit board. Such a board cover and a circuit board are attached to the chassis by attachment means such as screws. As an example of such a liquid crystal display device configured to fix a circuit board with screws, one described in Patent Document 1 below is known.

JP 2007-180751 A

(Problems to be solved by the invention)
By the way, the operation | work which attaches a board | substrate cover to a chassis may be performed in the state which stood the chassis, ie, the state where the attachment surface of the board | substrate cover in a chassis was along the perpendicular direction. For this reason, when an operator attaches the substrate cover, it is necessary to hold the substrate cover by hand so that the substrate cover does not fall, and there is room for improvement in workability. In addition, when the operator holds the board cover by hand, there is a concern that the board cover may fall during the attaching operation and come into contact with the circuit board to damage the circuit board.

The present invention has been completed based on the above-described circumstances, and an object thereof is to provide an illuminating device capable of easily performing a mounting operation of a substrate cover. Moreover, it aims at providing the display apparatus provided with such an illuminating device, and a television receiver.

(Means for solving problems)
In order to solve the above-described problems, a lighting device of the present invention includes a light source, a chassis in which the light source is accommodated, a circuit board attached to a bottom plate of the chassis, and attached to the bottom plate to cover the circuit board. A board cover arranged in a shape, wherein the bottom plate is provided with a protrusion protruding toward the board cover, and the chassis is installed such that the plate surface of the bottom plate is along the vertical direction In the state, the protrusion is characterized by supporting the substrate cover.

In the present invention, in the installed state where the chassis is installed such that the plate surface of the bottom plate of the chassis is along the vertical direction, the board cover is supported by the protrusions. Accordingly, when the board cover is attached to the chassis in the above installed state, the board cover can be prevented from dropping, and workability related to the attachment can be improved.

In the above configuration, in the installation state, the protrusion may support the lower end portion of the substrate cover from below. In the present invention, the substrate cover can be attached with the lower end of the substrate cover supported from below. For this reason, even if the board cover supported by the protrusion falls from the protrusion, the board cover rotates in a direction away from the circuit board with the contact point with the protrusion as the center of rotation. Fall at. If the protrusion is not formed, the substrate cover may drop along the bottom plate surface, and the substrate cover may come into contact with the circuit board. In this regard, in the present invention, by providing the protrusion, it is possible to suppress the situation in which the substrate cover falls along the plate surface of the bottom plate, and to protect the circuit board.

Further, the protrusion may be formed with a recess into which the lower end of the substrate cover is fitted. When the substrate cover is attached, the situation where the substrate cover falls from the protrusion can be suppressed by fitting the lower end of the substrate cover into the recess.

In addition, an insertion hole into which the protrusion can be inserted is formed in the substrate cover, and the protrusion can be inserted into the insertion hole to support the substrate cover. By inserting the insertion hole of the substrate cover into the protrusion when the substrate cover is attached, a situation where the substrate cover falls from the protrusion can be suppressed, and the substrate cover can be supported more reliably.

Further, the tip end portion may extend from the tip end of the projection so as to cover the substrate cover from the side opposite to the chassis. By covering the substrate cover from the side opposite to the chassis at the front end portion, it is possible to suppress the situation where the substrate cover falls from the protrusion, and the substrate cover can be supported more reliably.

Further, the circuit board is attached in such a manner as to straddle a plurality of attachment portions protruding from the bottom plate, and the protrusion is formed on at least one attachment portion among the plurality of attachment portions. Can be.

Further, the protrusion may be formed integrally with the chassis. With such a configuration, it is possible to reduce the number of parts and contribute to cost reduction.

Next, in order to solve the above-described problem, a display device according to the present invention includes the above-described illumination device and a display panel that performs display using light from the illumination device.

Also, as the display panel, a liquid crystal panel using liquid crystal 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.

Next, in order to solve the above-described problem, a television receiver according to the present invention includes the display device.

(The invention's effect)
ADVANTAGE OF THE INVENTION According to this invention, the illuminating device which can perform the attachment operation | work of a board | substrate cover easily can be provided.

The disassembled perspective view which shows schematic structure of the television receiver which concerns on Embodiment 1 of this invention. The disassembled perspective view which shows schematic structure of the liquid crystal display device with which the television receiver of FIG. 1 is provided. Sectional drawing which shows the cross-sectional structure along the long side direction of a liquid crystal display device. The top view which shows the back surface of the backlight apparatus with which the liquid crystal display device of FIG. 3 is provided. The enlarged view which expands and shows the state which attached the board | substrate cover in FIG. Sectional drawing which shows the attachment structure of a board | substrate cover and a control board (The figure cut | disconnected by the AA line of FIG. 5). Sectional drawing which shows the protrusion concerning Embodiment 2 of this invention. Sectional drawing which shows the protrusion concerning Embodiment 3 of this invention. The top view which shows the state which attached the board | substrate cover in Embodiment 4 of this invention. Sectional drawing which shows the protrusion concerning Embodiment 4 of this invention.

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. First, the configuration of the television receiver TV including the liquid crystal display device 10 will be described. 1 is an exploded perspective view showing a schematic configuration of the television receiver of the present embodiment, FIG. 2 is an exploded perspective view showing a schematic configuration of a liquid crystal display device included in the television receiver of FIG. 1, and FIG. 3 is a liquid crystal display of FIG. It is sectional drawing which shows the cross-sectional structure along the long side direction of an apparatus. The long side direction of the liquid crystal display device 10 (and the chassis 14) is the X-axis direction, the short side direction is the Y-axis direction, and the vertical direction in FIG. 3 is the Z-axis direction (front and back direction).

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, a power supply substrate P, and a tuner T. And a stand S. The liquid crystal display device 10 (display device) has a horizontally long rectangular shape as a whole, and is housed in a vertically placed state (a short side direction is arranged along the vertical direction. In the following description, The vertical direction in this vertically placed state (vertical direction in FIG. 4, Y-axis direction) is referred to as the vertical direction.This liquid crystal display device 10 includes a liquid crystal panel 11 (display panel), as shown in FIG. A backlight device 12 (illumination device) as an external light source is provided, and these are integrally held by a frame-like bezel 13 or the like.

Next, the liquid crystal panel 11 and the backlight device 12 constituting the liquid crystal display device 10 will be described. 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, an alignment film, and the like. The substrate is provided with a color filter and counter electrodes in which colored portions such as R (red), G (green), and B (blue) are arranged in a predetermined arrangement, and an alignment film. Note that

polarizing plates

11a and 11b are attached to the outside of both substrates (see FIG. 3).

As shown in FIG. 2, the backlight device 12 is attached so as to cover a substantially box-shaped chassis 14 having an opening 14 b on the light emitting surface side (liquid crystal panel 11 side), and the opening 14 b of the chassis 14. Diffusion plate 15a, a plurality of optical sheets 15b arranged between the diffusion plate 15a and the liquid crystal panel 11, and a long side edge of the diffusion plate 15a arranged along the long side of the chassis 14 with the chassis 14 And a frame 16 that is held between them.

Further, in the chassis 14, a cold cathode tube 17 (light source), a lamp clip 18 for attaching the cold cathode tube 17 to the chassis 14, and a relay for relaying electrical connection at each end of the cold cathode tube 17. A connector 19 and a holder 20 that collectively covers the end of the cold cathode tube 17 group and the relay connector 19 group are accommodated. In the backlight device 12, the diffusion plate 15 a side is a light emission side from the cold cathode tube 17.

The chassis 14 is made of a metal plate-like member formed by sheet metal, and has a rectangular flat plate-like bottom plate 14a and an outer edge portion 21 (short side in the short side direction) that rises from each side and is folded back into a substantially U shape. It has a substantially box shape including an outer edge portion 21a and a long side outer edge portion 21b) in the long side direction. In the bottom plate 14 a of the chassis 14, a plurality of attachment holes 22 for attaching the relay connector 19 are formed through both ends of the long side direction. Further, as shown in FIG. 3, a fixing hole 14c is formed through the upper surface of the long-side outer edge portion 21b of the chassis 14, and the bezel 13, the frame 16, the chassis 14 and the like are integrated by screws or the like, for example. It is possible. The material of the chassis 14 is not limited to metal and can be changed as appropriate.

As shown in FIG. 2 or FIG. 6, a light reflection sheet 23 is disposed on the inner surface side (the surface side facing the cold cathode tube 17) of the bottom plate 14 a of the chassis 14. The light reflecting sheet 23 is made of synthetic resin, and the surface thereof is white with excellent reflectivity, and is laid so as to cover almost the entire region along the inner surface of the bottom plate 14a of the chassis 14 (FIG. 3). (The light reflection sheet is not shown). With this light reflecting sheet 23, it is possible to reflect the light emitted from the cold cathode tube 17 toward the diffusion plate 15a.

On the other hand, a diffusion plate 15a and an optical sheet 15b are disposed on the opening 14b side of the chassis 14. The diffusion plate 15a is formed by dispersing light scattering particles in a synthetic resin plate-like member and has a function of diffusing linear light emitted from the cold cathode tube 17 serving as a tubular light source. As described above, the short side edge portion of the diffusion plate 15a is placed on the first surface 20a of the holder 20, and is not subjected to vertical restraining force. On the other hand, the long side edge of the diffusion plate 15 a is fixed by being sandwiched between the chassis 14 and the frame 16.

The optical sheet 15b disposed on the diffusion plate 15a is a laminate of a diffusion sheet, a lens sheet, and a reflective polarizing plate in order from the diffusion plate 15a side. The optical sheet 15b is emitted from the cold cathode tube 17 and passes through the diffusion plate 15a. It has a function of converting the light that has passed through into planar light. The liquid crystal panel 11 is installed on the upper surface side of the optical sheet 15 b, and the optical sheet 15 b is sandwiched between the diffusion plate 15 a and the liquid crystal panel 11.

The cold-cathode tube 17 has a long and narrow tubular shape, and a large number (20 in this embodiment) are parallel to each other in a state in which the length direction (axial direction) thereof coincides with the long side direction of the chassis 14. They are housed in the chassis 14 in a line-up state (see FIG. 2). Each end of the cold cathode tubes 17 is provided with a terminal (not shown) for receiving driving power, the end is fitted into the relay connector 19, and a holder 20 is attached so as to cover the relay connector 19. It has been.

The holder 20 that covers the end of the cold cathode tube 17 is made of a white synthetic resin and has an elongated, substantially box shape extending along the short side direction of the chassis 14. The holder 20 is arranged so as to partially overlap the short side outer edge portion 21a of the chassis 14, and constitutes the side wall of the backlight device 12 together with the short side outer edge portion 21a. As shown in FIG. 3, the insertion pin 24 protrudes from the surface of the holder 20 that faces the folded outer edge portion 21 a of the chassis 14, and the insertion pin 24 is formed on the upper surface of the short-side outer edge portion 21 a of the chassis 14. The holder 20 is attached to the chassis 14 by being inserted into the insertion hole 25.

As shown in FIG. 3, the stepped surface of the holder 20 consists of three surfaces parallel to the bottom plate 14a of the chassis 14, and the short side edge of the diffusion plate 15a is placed on the first surface 20a at the lowest position. Has been. Further, an inclined cover 26 that extends toward the bottom plate 14a of the chassis 14 extends from the first surface 20a. The short side edge portion of the liquid crystal panel 11 is placed on the second surface 20 b of the stepped surface of the holder 20. The third surface 20 c at the highest position among the stepped surfaces of the holder 20 is disposed at a position overlapping the short side outer edge portion 21 a of the chassis 14 and is in contact with the bezel 13.

As shown in FIGS. 2 and 4, an inverter board 30 and a control board 40 are attached to the outer surface side of the bottom plate 14a of the chassis 14 (on the opposite side to the cold cathode tube 17 and the back surface side). The above-described power supply board P (see FIG. 1, not shown in FIG. 4) is electrically connected to the inverter board 30 and the control board 40, and is a power supply source that supplies power to each of these boards. ing.

The inverter board 30 is provided at both ends of the long side direction of the chassis 14 and has a long rectangular shape along the short side direction of the chassis 14. Each inverter board 30 is electrically connected to the cold cathode tube 17 via a connector 27 and a harness 28. Further, the inverter board 30 boosts the input voltage input from the power supply board P by an inverter circuit constituted by a transformer or the like, and outputs an output voltage higher than the input voltage to the cold cathode tube 17. 17 has a function of controlling turning on (or turning off).

As shown in FIG. 4, the control board 40 (circuit board) has a rectangular shape, and is centered in the long side direction of the chassis 14 and a position biased to one side in the short side direction of the chassis 14 (FIG. 4). (Upper side). The control board 40 has a circuit component 41 mounted on a board made of synthetic resin (for example, made of paper phenol or glass epoxy resin), and receives various input signals such as TV signals from the tuner T as signals for driving the liquid crystal. And a function of supplying the converted liquid crystal driving signal to the liquid crystal panel 11.

As shown in FIGS. 2 and 5, a board cover 60 is attached to the bottom plate 14 a of the chassis 14 so as to cover the control board 40. A substrate cover 31 is attached to the bottom plate 14 a so as to cover each inverter substrate 30. Such a

substrate cover

60, 31 has a function of protecting the

substrates

40, 30 and preventing the touch of the

substrates

40, 30 when the substrate becomes hot, such as when the substrate is driven. I'm in charge. FIG. 4 shows a state in which the substrate covers 60 and 31 are removed from the chassis 14.

As shown in FIGS. 2 and 6, the substrate cover 60 has a plate shape, and has a central portion 61 having a substantially U shape in cross section opened toward the chassis 14, and the chassis 14 in the central portion 61. End 62 (upper end 62A and lower end 62B) extending along the bottom plate 14a from both ends in the short side direction (upper and lower ends in FIG. 6). In FIG. 6, the control substrate 40 and the substrate cover 60 are shown in a sectional view.

Next, the mounting structure of the control board 40 and the board cover 60 to the chassis 14 will be described. As shown in FIGS. 5 and 6, on the surface of the bottom plate 14 a of the chassis 14 on the outer side of the chassis 14, an attachment base portion 50 (attachment portion, partially indicated by a broken line in FIG. 5) is provided at the attachment location of the control board 40. A plurality of control boards 40 are formed so as to straddle the plurality of mounting base parts 50. Further, the control board 40 is attached to each mounting base portion 50 by screws B1.

The mounting base 50 is formed by protruding a part of the bottom plate 14a toward the outer surface side of the chassis 14 as shown in FIG. As shown in FIG. 5, the mounting base 50 is formed at positions corresponding to the four corners of the control board 40 having a square shape. The upper mounting base 50 (indicated by reference numeral 50A) shown in FIG. 5 has a substantially hemispherical shape. On the other hand, the lower mounting base 50 (indicated by reference numeral 50B) shown in FIG. 5 has a substantially rectangular shape that is long in the vertical direction in FIG.

As shown in FIG. 6, each mounting base portion 50 is formed with a circular mounting hole 51 into which the screw B <b> 1 can be inserted. And the protrusion 52 is formed in the mounting base part 50B in the form which protruded one part to the chassis 14 outer surface side (namely, integral formation with the chassis 14). The protrusion 52 is arranged below the adjacent mounting hole 51 in the vertically placed state (installed state), and is configured to support the lower end 62 of the substrate cover 60.

As shown in FIG. 5, the protrusion 52 has a substantially quadrangular prism shape. The protruding portion 52 extends in a form in which the protruding direction coincides with a direction orthogonal to the plate surface of the bottom plate 14a of the chassis 14 (X-axis and Y-axis directions, the vertical direction in FIG. 6).

The protrusion 52 is formed so that the protrusion length L1 is not less than the sum of the plate thickness t1 of the substrate cover 60 and the plate thickness t2 of the control substrate 40, as shown in FIG. In addition, the control board 40 and the board cover 60 are supported from below. In addition, the shape of the protrusion 52 is not limited to a columnar shape, and can be changed as appropriate. For example, the protrusion 52 may be a columnar shape.

The control board 40 is formed with a circular screw insertion hole 45 into which the screw B1 can be inserted. A circular screw insertion hole 65 is formed at a position overlapping the screw insertion hole 45 at the end 62 of the substrate cover 60. As a result, the screw B1 is inserted into both the screw insertion holes 45 and 65 from the outside of the chassis 14, and then the tip end of the screw B1 is screwed into the mounting hole 51 of the mounting base 50, whereby the control board for the chassis 14 is secured. 40 and the substrate cover 60 can be attached.

Further, as described above, the mounting base 50 is formed by protruding a part of the bottom plate 14a to the outer surface side of the chassis 14. For this reason, when screw B1 is screwed into the inner periphery of mounting hole 51, it is possible to suppress a situation in which the tip of screw B1 interferes with light reflecting sheet 23 provided on bottom plate 14a.

In the present embodiment, the mounting base 50A and the mounting base 50B are also formed at locations corresponding to both ends of the inverter board 30 in the long side direction on the bottom plate 14a of the chassis 14, respectively. The cover 31 can be attached via the screw B1. Further, a protrusion 52 is also formed on the mounting base portion 50B, so that the inverter substrate 30 and the substrate cover 31 can be supported. The mounting structure for mounting the inverter board 30 and the board cover 31 to the mounting base 50 (structure using the protrusion 52 and the screw B1) is the mounting for mounting the control board 40 and the board cover 60 to the mounting base 50. Since it is the same as the structure, detailed description is omitted.

Next, a procedure for attaching the control board 40 and the board cover 60 to the chassis 14 in the backlight device 12 of the present embodiment will be described. In the present embodiment, the chassis 14 is vertically placed with a holder (not shown) or the like, and the control board 40 and the board cover 60 are attached in this vertically placed state.

In addition, a vertical installation state here is an installation state (state of FIG.4 and FIG.6) which installed the chassis 14 in the form where the plate | board surface 14a1 of the bottom plate 14a of the chassis 14 followed a perpendicular direction. In this vertically placed state, the control board 40 is arranged at the upper part of the bottom plate 14a and at the central part in the left-right direction.

First, as shown in FIG. 6, the lower end portion of the control board 40 is placed on the upper surface 52A of each protrusion 52 of each mounting base portion 50B. As a result, the control board 40 is supported by the protrusions 52.

Subsequently, the substrate cover 60 is disposed so as to cover the control substrate 40 from the outside of the chassis 14 (right side in FIG. 6). At this time, the lower end 62B of the substrate cover 60 is placed on the upper surface 52A of each protrusion 52. Thereby, as shown in FIG. 5, the substrate cover 60 is supported so as to straddle both protrusions 52. In this state, the end portions 62 of the substrate cover 60 and the peripheral end portions on the upper and lower sides of the control substrate 40 are arranged so as to overlap each other in plan view.

Next, the screw B1 is inserted into both the screw insertion hole 45 of the control board 40 and the screw insertion hole 65 of the board cover 60 from the outside of the chassis 14, and the tip of the screw B1 is screwed into the mounting hole 51 of the mounting base 50. Let Thereby, the attachment of the control board 40 and the board cover 60 to the chassis 14 is completed.

As described above, in the present embodiment, the cold cathode tube 17, the chassis 14 in which the cold cathode tube 17 is accommodated, the control board 40 attached to the bottom plate 14a of the chassis 14, and the bottom plate 14a. And a substrate cover 60 disposed so as to cover the control substrate 40. The bottom plate 14a is provided with a protrusion 52 projecting toward the substrate cover 60, and the plate surface 14a1 of the bottom plate 14a extends in the vertical direction (Y In the installed state in which the chassis 14 is installed along the axial direction), the protrusion 52 is characterized by supporting the substrate cover 60.

In the present embodiment, the board cover 60 is supported by the protrusion 52 in the installed state in which the chassis 14 is installed such that the plate surface 14a1 of the bottom plate 14a of the chassis 14 is along the vertical direction. Thereby, when the board cover 60 is attached to the chassis 14 in the installation state, the fall of the board cover 60 can be suppressed, and workability related to the attachment can be improved.

In the above configuration, in the installed state, the protrusion 52 can support the lower end 62B of the substrate cover 60 from below. The substrate cover 60 can be attached with the lower end 62B of the substrate cover 60 supported from below. For this reason, even if the substrate cover 60 supported by the protrusion 52 falls from the protrusion 52, the substrate cover 60 moves away from the circuit board with the contact point with the protrusion 52 as the center of rotation. It falls in the form of rotating in the direction (the direction of rotation of the substrate cover 60 is indicated by the arrow P1 in FIG. 6).

If the projection 52 is not provided, the substrate cover 60 falls along the plate surface 14a1 of the bottom plate 14a. That is, there is a possibility that the substrate cover 60 falls from the state shown in FIG. 6 and the substrate cover 60 may come into contact with the control substrate 40 (circuit component 41 or the like). In this respect, in the present embodiment, by providing the protrusion 52, it is possible to suppress the situation in which the substrate cover 60 falls along the plate surface 14a1 of the bottom plate 14a, and to protect the control substrate 40 (and in turn, its mounted components). .

The control board 40 is attached so as to straddle a plurality of mounting base parts 50 projecting from the chassis 14, and the projecting part 52 is at least one of the plurality of mounting base parts 50. It is formed in the part 50.

Further, the protrusion 52 is formed integrally with the chassis 14. With such a configuration, it is possible to reduce the number of parts and contribute to cost reduction.

<Embodiment 2>
Next, Embodiment 2 of the present invention will be described with reference to FIG. The same parts as those in the above embodiment are denoted by the same reference numerals, and redundant description is omitted. In the backlight device 112 of this embodiment, the configuration of the protrusions is different from that of the above embodiment. The protrusion 152 of the present embodiment is formed with a recess 152A that is recessed downward, and the lower end 62B of the substrate cover 60 and the lower end of the control substrate 40 can be fitted into the recess 152A. ing.

With this configuration, when the substrate cover 60 is attached, the lower end 62B of the substrate cover 60 is fitted into the recess 152A, so that the situation where the substrate cover 60 falls from the protrusion 152 can be suppressed. In the present embodiment, both the substrate cover 60 and the control substrate 40 are fitted in the recess 152A, but the present invention is not limited to this. For example, a configuration may be adopted in which only the substrate cover 60 is fitted into the recess 152A.

<Embodiment 3>
Next, Embodiment 3 of the present invention will be described with reference to FIG. The same parts as those in the above embodiment are denoted by the same reference numerals, and redundant description is omitted. In the backlight device 212 of the present embodiment, the configuration relating to the protrusions is different from that of the above embodiment. The protrusion 252 of the present embodiment is a plate-like member that is configured as a separate part from the chassis 14.

The protrusion 252 protrudes in a downwardly inclined manner with respect to the direction intersecting the plate surface 14a1 of the bottom plate 14a. From the tip of the protrusion 252, the tip 253 extends so as to cover the substrate cover 260 from the side opposite to the chassis 14 (the right side in FIG. 8). That is, the protrusion 252 and the tip 253 constitute a substantially L-shaped member in cross-sectional view. Thus, by covering the lower end portion 262B of the substrate cover 260 from the side opposite to the chassis 14 at the front end portion 253, a situation in which the substrate cover 260 falls from the protrusion 252 can be suppressed, and the substrate cover 260 can be more securely attached. Can be supported.

In the above-described embodiment, the control board 40 and the board cover 60 are attached to the chassis 14 by passing the screws B1 through both the screw insertion holes 45 of the control board 40 and the screw insertion holes 65 of the board cover 60, in other words. And the control board 40 and the board | substrate cover 60 were set as the structure attached simultaneously. On the other hand, in this embodiment, the control board 40 and the board cover 260 are individually attached to the chassis 14 with different screws B1. That is, the control board 40 and the board cover 260 are fixed separately. For this reason, the control board 40 is not supported by the protrusions 252, and only the substrate cover 260 is supported by the protrusions 252.

<Embodiment 4>
Next, a fourth embodiment of the present invention will be described with reference to FIGS. The same parts as those in the above embodiment are denoted by the same reference numerals, and redundant description is omitted. In the backlight device 312 of the present embodiment, the configuration related to the protrusion is different from that of the above embodiment. The protrusion 352 of the present embodiment includes a base end portion 352B extending from the bottom plate 14a and a front end portion 352A extending so as to bend upward with respect to the base end portion 352B. There is no.

As shown in FIG. 9, insertion holes 363 are respectively formed in the lower end portion 362 </ b> B of the substrate cover 360 corresponding to the protrusions 352. The insertion hole 363 has a rectangular shape, and the protrusion 352 can be inserted therethrough. In this embodiment, the board cover 360 can be supported by inserting the protrusion 352 into the insertion hole 363. With such a configuration, when the substrate cover 360 is attached, by inserting the insertion hole 363 of the substrate cover 360 into the protrusion 352, the situation in which the substrate cover 360 falls from the protrusion 352 can be suppressed, and more reliably. The substrate cover 360 can be supported. Note that the shape of the insertion hole 363 is not limited to a square shape and can be changed as appropriate.

In this embodiment, the tip 352A of the protrusion 352 can be locked to the edge of the insertion hole 363 from the outside of the chassis 14 (the side opposite to the chassis 14). In this way, the protrusion 352 is less likely to be removed from the insertion hole 363, and the substrate cover 360 can be more reliably supported by the protrusion 352.

<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 shape and number of protrusions can be changed as appropriate. The protrusion may be anything that can support the substrate cover. For example, the protrusion may have a structure in which the substrate cover is sandwiched and supported by a pair of protrusions.

(2) The location where the protrusion 52 is formed is not limited to the mounting base 50. The bottom plate 14 a of the chassis 14 may be formed at a location other than the mounting base portion 50. Moreover, you may form in the at least 1 mounting base part 50 among the some mounting base parts 50. FIG.

(3) The shape of the mounting base 50 is not limited to that of the above embodiment. Further, the board cover 60 and the control board 40 may be configured to be attached to a portion of the bottom plate 14a of the chassis 14 where the mounting base 50 is not formed.

(4) In the above embodiment, the control board 40 is exemplified as the circuit board, but the present invention is not limited to this. As long as the circuit board and the board cover are attached to the chassis 14, the configuration of the present invention (configuration supported by the protrusions) can be applied.

(5) In each of the above-described embodiments, the cold cathode tube 17 is used as the light source. However, the present invention is not limited to this. It is also possible to use a hot cathode tube or an LED as the light source.

(6) In the above-described embodiment, the liquid crystal panel and the chassis have been vertically placed with the short side direction aligned with the vertical direction. However, the liquid crystal panel and the chassis have the long side direction set to the vertical direction. It may be in a vertically placed state matched.

(7) In the above-described embodiment, the TFT is used as the switching element of the liquid crystal display device. However, the present invention can also be applied to a liquid crystal display device using a switching element other than TFT (for example, a thin film diode (TFD)), and color display. In addition to the liquid crystal display device, the present invention can be applied to a liquid crystal display device that displays black and white.

(8) In the above-described embodiment, the liquid crystal display device using the liquid crystal panel as the display panel has been illustrated, but the present invention can also be applied to a display device using another type of display panel.

(9) In the above-described embodiment, the television receiver provided with the tuner is exemplified, but the present invention can also be applied to a display device not provided with the tuner.

DESCRIPTION OF SYMBOLS 10 ... Liquid crystal display device (display device), 11 ... Liquid crystal panel (display panel), 12, 112, 212, 312 ... Backlight device (illumination device), 14 ... Chassis, 14a ... Bottom plate, 14a1 ... Plate surface of bottom plate, 17 ... Cold cathode tube (light source), 40 ... Control board (circuit board), 50 ... Mounting base (mounting part), 52, 152, 252, 352 ... Projection, 60, 260, 360 ... Board cover, 62B, 262B, 362B ... lower end portion of substrate cover, 152A ... concave portion, 253 ... tip portion, 363 ... insertion hole, TV ... TV receiver

Claims

A light source;
A chassis containing the light source;
A circuit board attached to the bottom plate of the chassis;
A board cover attached to the bottom plate and arranged to cover the circuit board,
The bottom plate is provided with a protrusion protruding to the substrate cover side,
In the installation state in which the chassis is installed such that the plate surface of the bottom plate is along the vertical direction, the projection supports the substrate cover.
The lighting device according to claim 1, wherein, in the installed state, the protrusion supports a lower end portion of the substrate cover from below.
3. The illumination device according to claim 2, wherein the protrusion is formed with a recess into which the lower end portion of the substrate cover is fitted.
The substrate cover is formed with an insertion hole through which the protrusion can be inserted,
The lighting device according to claim 1, wherein the protrusion supports the substrate cover by being inserted through the insertion hole.
5. The lighting device according to claim 1, wherein a tip end portion extends from a tip end of the protrusion so as to cover the substrate cover from a side opposite to the chassis. .
The circuit board is attached so as to straddle a plurality of attachment portions protruding from the bottom plate,
The lighting device according to claim 1, wherein the protrusion is formed on at least one of the plurality of mounting portions.
The lighting device according to any one of claims 1 to 6, wherein the protrusion is formed integrally with the chassis.
The lighting device according to any one of claims 1 to 7,
And a display panel that performs display using light from the lighting device.
The display device according to claim 8, wherein the display panel is a liquid crystal panel using liquid crystal.
A television receiver comprising the display device according to claim 8 or 9.