WO2012005064A1

WO2012005064A1 - Illumination device, display device, and television receiver device

Info

Publication number: WO2012005064A1
Application number: PCT/JP2011/062061
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 chassis (14); and a substrate cover (60) that is attached to the chassis (14) and that is arranged so as to cover the control substrate (40). The illumination device is characterized in that: projections (52) that project toward the substrate cover (60) are provided on the chassis (14) in areas where the substrate cover (60) is attached thereto; and the substrate cover (60) has cover-side insertion holes (63) through which the respective projections (52) are inserted.

Description

Lighting device, display device, 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), an optical member (such as a diffusion plate) that is disposed in the opening of the chassis and efficiently emits light emitted from the light sources to the liquid crystal panel side, And a reflection sheet that 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. In addition, what was described in following patent document 1 is known as an example of the liquid crystal display device of the structure which fixes a circuit board with a screw | thread with respect to a chassis.

JP 2007-180751 A

(Problems to be solved by the invention)
By the way, the operation | work which attaches a board | substrate cover to the bottom plate of a chassis is generally performed in the state which stood the illuminating device, ie, the state where the attachment surface of the bottom plate of 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 come off during the attachment work, contact the circuit board, and be damaged.

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 problems, an illumination device according to the present invention is arranged in such a manner that a light source, a chassis that houses the light source, a circuit board that is attached to the chassis, and a circuit board that is attached to the chassis and covers the circuit board. The board cover is provided with a protrusion protruding toward the board cover, and the board cover is inserted through the protrusion. It is characterized by the formation of holes.

The board cover can be held with respect to the chassis by inserting the protrusion into the insertion hole. Thereby, when attaching a board | substrate cover with respect to a chassis, a board | substrate cover can be hold | maintained and attachment work can be performed easily. In addition, since the substrate cover can be held, it is possible to suppress a situation where the substrate cover falls when the substrate cover is attached.

In the above configuration, the protruding portion may be formed in a shape in which the protruding length is equal to or longer than the plate thickness of the substrate cover.

With such a configuration, the board cover can be more securely held with respect to the chassis when the protrusion is inserted through the insertion hole.

In addition, the protruding end of the protrusion is formed in a shape in which the width is larger than the width of the base end of the protrusion, and the base end of the protruding end is inserted through the insertion hole. In this state, the edge of the insertion hole can be locked from the side opposite to the chassis side.

With such a configuration, the projecting end portion is locked from the opposite side of the chassis side to the edge portion of the insertion hole, so that the projection is less likely to come out of the insertion hole. Thereby, a board | substrate cover can be hold | maintained more reliably with respect to a chassis.

Further, the protrusion may be provided on a bottom plate of the chassis, and the protrusion may be formed to be inclined with respect to a direction orthogonal to the extending direction of the bottom plate.

As described above, when the protrusion is inclined with respect to the direction orthogonal to the extending direction of the bottom plate, when the extending direction of the bottom plate is matched with the vertical direction (when the chassis is erected), It is also possible to turn the tip of the protrusion upward. In this way, the tip of the protrusion is directed upward so that the protrusion can be easily inserted into the insertion hole of the substrate cover. In addition, it is possible to suppress a situation in which the substrate cover drops from the protrusion after the protrusion is inserted through the insertion hole.

In the circuit board, a board side insertion hole is formed at a position overlapping the insertion hole of the board cover, and the protrusion is inserted through both the insertion hole and the board side insertion hole. It can be.

With such a configuration, the circuit board can be held by inserting the protrusion into the board side insertion hole.

In addition, the circuit board is attached so as to straddle a plurality of attachment portions protruding from the chassis, and the protrusion is formed on at least one attachment portion of the plurality of attachment portions. Can be.

Further, an elastic member may be interposed between the protrusion and the inner peripheral surface of the insertion hole.

With such a configuration, when the protrusion is inserted into the insertion hole, the protrusion becomes difficult to be removed from the insertion hole, and the board cover can be more securely held with respect to the chassis.

Also, the protrusion can be a screw member attached to the chassis.

With such a configuration, the protrusion can be easily formed.

Further, the screw member can attach the circuit board to the chassis.

Thus, if the screw member for attaching the circuit board is a protrusion, there is no need to separately form a protrusion, and the cost for forming the protrusion can be reduced.

Further, the protrusion may be formed integrally with the chassis.

Such a configuration can reduce the number of parts and contribute to cost reduction.

Further, the protrusion may have a shape that tapers toward the tip.

Such a configuration makes it easier to insert the protrusion into the insertion hole, improving workability.

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 control board vicinity in FIG. The enlarged view which shows the state which attached the board | substrate cover in FIG. Sectional drawing which shows the attachment structure of a substrate cover and a control board (the figure cut | disconnected by the AA line of FIG. 6). Sectional drawing which shows the attachment structure of a substrate cover and a control board (the figure cut | disconnected by the BB line of FIG. 6). 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 protrusion concerning Embodiment 3 of this invention. Sectional drawing which shows the protrusion concerning Embodiment 4 of this invention. Sectional drawing which shows the protrusion concerning Embodiment 5 of this invention. Sectional drawing which shows the protrusion concerning Embodiment 6 of this invention. Sectional drawing which shows the protrusion concerning Embodiment 7 of this invention. Sectional drawing which shows the protrusion concerning Embodiment 8 of this invention. Sectional drawing which shows the protrusion concerning Embodiment 9 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 accommodated in a vertically placed state (a state in which the short side direction is arranged along the vertical direction). As shown in FIG. 2, the liquid crystal display device 10 includes a liquid crystal panel 11 (display panel) and a backlight device 12 (illumination device) as an external light source, which are integrated by a frame-like bezel 13 or the like. Is supposed to be retained.

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 14a 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 7, a light reflecting sheet 23 is disposed on the inner surface side (the surface side facing the cold cathode tube 17) of the bottom plate 14a 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, the control board 40, and the like, and serves as a power supply source that supplies power thereto.

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, and a board cover 31 is attached so as to cover each inverter board 30. Yes. FIG. 4 shows a state in which the substrate covers 60 and 31 are removed from the chassis 14. Such substrate covers 60 and 31 protect the

substrates

40 and 30 and have a function of preventing a hand from touching the substrate when the substrate becomes hot, such as when the substrate is driven.

As shown in FIG. 7, the substrate cover 60 has a plate-like shape, and has a central portion 61 having a substantially U shape in cross section opened toward the chassis 14, and a short side of the chassis 14 in the central portion 61. And end portions 62 respectively extending along the bottom plate 14a from both ends in the direction (upper and lower ends in FIG. 7). In FIG. 7, 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 FIG. 8, a plurality of mounting pedestal portions 50 (mounting portions) are formed at the mounting locations of the control board 40 on the surface of the bottom plate 14a of the chassis 14 outside the chassis 14, and the control board 40 includes a plurality of control boards 40. Are arranged so as to straddle the mounting pedestal 50. Further, the control board 40 is attached to each mounting base portion 50 by screws B1.

The mounting base part 50 is formed by protruding a part of the bottom plate 14a to the outer surface side of the chassis 14 (projected). 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 pedestal 50 (indicated by reference numeral 50A) shown in FIG. 5 has a long shape along the long side direction (X-axis direction) of the chassis 14, and both ends in the long side direction are seen in a plan view shown in FIG. Are respectively curved. On the other hand, the lower mounting base 50 (indicated by reference numeral 50B) shown in FIG. 5 has a substantially circular shape in plan view.

As shown in FIG. 8, each mounting base 50 is formed with a circular mounting hole 51 into which the screw B1 can be inserted. A screw is cut on the inner peripheral surface of the mounting hole 51, and the tip of the screw B1 can be screwed. And the protrusion 52 is formed in 50 A of upper mounting base parts by projecting one part to the chassis 14 outer surface side. That is, the protrusion 52 is integrally formed with the chassis 14. The protrusion 52 is arranged at the same position in the short side direction of the adjacent mounting hole 51 and the chassis 14.

As shown in FIG. 7 and FIG. 8, the protrusion 52 has a substantially cylindrical shape with a tip portion forming a curved surface. The protruding portion 52 extends in a form in which the protruding direction coincides with a direction orthogonal to the extending direction of the bottom plate 14a of the chassis 14 (X-axis and Y-axis directions, the vertical direction in FIG. 7). The protrusion 52 is inserted into both the substrate side insertion hole 43 formed in the control substrate 40 and the cover side insertion hole 63 (insertion hole) formed in the end portion 62 of the substrate cover 60.

Also, the protrusion 52 has a fillet shape and tapers toward the tip. Thereby, it becomes easy to insert the protrusion 52 into the board side insertion hole 43 and the cover side insertion hole 63, and workability is improved.

The protrusion 52 is formed such 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, when the control board 40 and the board cover 60 are attached to the chassis 14, the tip of the protrusion 52 protrudes outside the chassis 14. In addition, the shape of the protrusion 52 is not limited to a substantially cylindrical shape, and can be changed as appropriate. For example, the protrusion 52 may have a prismatic 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 portion 50 is formed by protruding a part of the bottom plate 14a toward the outer surface side of the chassis 14, and therefore, as shown in FIG. ) Can be prevented from interfering with the light reflecting sheet 23 disposed on the bottom plate 14a.

In the present embodiment, the mounting base 50A and the mounting base 50B are 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. 31 can be attached via a screw B1. Since the mounting structure for mounting the inverter board 30 and the board cover 31 to the mounting base 50 is substantially the same as the mounting structure for mounting the control board 40 and the board cover 60 to the mounting base 50, detailed description thereof 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 placed vertically with a holder (not shown) or the like, that is, the extended surface of the bottom plate 14a of the chassis 14 is in the vertical direction (the state shown in FIGS. 4 and 7). In this state, the control board 40 and the board cover 60 are attached. In the present embodiment, the backlight device 12 is held such that the side of the chassis 14 on which the control board 40 is arranged (the upper side in FIG. 4) is the upper side in the vertical direction.

First, as shown in FIG. 7, the control board 40 is arranged so that each protrusion 52 of each mounting base part 50 is inserted into each board-side insertion hole 43 of the control board 40. As a result, the control board 40 is held (temporarily held) with respect to the chassis 14.

Subsequently, the substrate cover 60 is disposed so as to cover the control substrate 40 from the outside of the chassis 14. Specifically, the substrate cover 60 is arranged so that each protrusion 52 is inserted into each cover side insertion hole 63 of the substrate cover 60. Thereby, the substrate cover 60 is held (temporarily held) with respect to the chassis 14 (state shown in FIG. 7). 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 chassis 14, and the control board 40 attached to the chassis 14. A board cover 60 disposed so as to cover the board 14, and a projecting portion 52 that projects toward the board cover 60 is provided at a mounting position of the board cover 60 in the chassis 14. A cover side insertion hole 63 through which the portion 52 is inserted is formed.

The board cover 60 can be held with respect to the chassis 14 by inserting the protrusion 52 into the cover side insertion hole 63. Thereby, when attaching the board | substrate cover 60 with respect to the chassis 14, the board | substrate cover 60 can be hold | maintained (temporarily holding | maintenance), and attachment work can be performed easily. Further, since the substrate cover 60 can be held, a situation in which the substrate cover 60 falls when the substrate cover 60 is attached can be suppressed. As a result, it is possible to suppress a situation in which the substrate cover 60 falls and hits the circuit component 41 or the like to damage it.

Further, the protrusion 52 is formed in such a shape that the protrusion length L1 is equal to or longer than the plate thickness t1 of the substrate cover 60.

With such a configuration, the substrate cover 60 can be more reliably held with respect to the chassis 14 when the protrusion 52 is inserted into the cover side insertion hole 63.

In the control board 40, a board side insertion hole 43 is formed at a position overlapping the cover side insertion hole 63 of the board cover 60, and the protrusion 52 is formed in both the cover side insertion hole 63 and the board side insertion hole 43. It may be inserted.

With such a configuration, the control board 40 can be held by inserting the protrusion 52 into the board side insertion hole 43.

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 protruding direction of the protrusion is different from that of the above embodiment. In this embodiment, the protrusion 152 is extended in the shape which faces the upper direction in FIG. In other words, the protrusion 152 is formed so as to be inclined with respect to a direction orthogonal to the extending direction of the bottom plate 14 a in the chassis 14. Note that the upwardly projecting projection 152 is formed by, for example, projecting a part of the mounting base 50 in a direction perpendicular to the extending direction of the bottom plate 14a, and then applying an external force to the projecting portion from below. It can be formed by acting.

Further, the cover side insertion hole 163 and the substrate side insertion hole 143 through which the protrusion 152 is inserted are formed such that each penetrating direction is along the protruding direction of the protrusion 152.

As described above, when the protrusion 152 is inclined with respect to the direction orthogonal to the extending direction of the bottom plate 14a, the extending direction of the bottom plate 14a matches the vertical direction (the chassis shown in FIG. 9). 14), the tip of the protrusion 152 can be directed upward. When the tip of the protrusion 152 faces upward, the protrusion 152 can be easily inserted into the cover side insertion hole 163 of the substrate cover 60. In addition, it is possible to prevent the substrate cover 60 from dropping from the protrusion 152 after the protrusion 152 is inserted through the cover side insertion hole 163.

<Embodiment 3>
Next, a third 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 212 of this embodiment, the shape of the protrusion is different from that of the above embodiment. As shown in FIG. 10, the protrusion 252 in the present embodiment includes a base end portion 252B having a cylindrical shape and a tip portion 252A (projecting end portion) having a spherical shape. The diameter of the distal end portion 252A (in other words, the width of the distal end portion) is set larger than the diameter of the proximal end portion 252B (the width of the proximal end portion). In addition, the shape of such a protrusion 252 can be formed, for example, by crushing the tip of the protrusion 252 with a dedicated tool (such as a hammer) or a device and plastically deforming it.

Further, as shown in FIG. 11, the shapes of the cover side insertion hole 263 and the substrate side insertion hole 243 are also different from those of the above embodiment. The cover side insertion hole 263 includes an insertion hole upper portion 263A having a substantially rectangular shape and a circular insertion hole lower portion 263B.

The inner diameter (hole diameter) of the insertion hole lower part 263B is set slightly larger than the outer diameter of the tip part 252A, and the tip part 252A can be inserted into the insertion hole lower part 263B. The insertion hole upper part 263A is arranged on the upper part (the peripheral end side of the chassis 14) of the insertion hole lower part 263B. The width of the insertion hole upper portion 263A (the length in the left-right direction in FIG. 11) is set to be larger than the width of the base end portion 252B and smaller than the outer diameter of the distal end portion 252A.

With the above configuration, as shown in FIG. 11, the base end 252 </ b> B can be inserted into the insertion hole upper part 263 </ b> A from below after the distal end part 252 </ b> A of the protrusion 252 is inserted into the insertion hole lower part 263 </ b> B. As a result, as shown in FIG. 11, the leading end 252A can be locked to the edge (hole edge) of the cover side insertion hole 263 from the outside of the chassis 14 (the side opposite to the chassis 14). . In this way, the protrusion 252 is unlikely to come out of the cover side insertion hole 263, and the board cover 60 can be more reliably held with respect to the chassis 14.

Also, the board side insertion hole 243 has the same shape as the cover side insertion hole 263. That is, it is composed of an insertion hole upper part 243A having a substantially rectangular shape and a circular insertion hole lower part 243B. With such a configuration, as in the case of the substrate cover 60, when the protrusion 252 is inserted into the substrate side insertion hole 243, the protrusion 252 is not easily removed from the substrate side insertion hole 243, and the chassis 14 On the other hand, the control board 40 can be held more reliably.

<Embodiment 4>
Next, a fourth embodiment 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 312 of the present embodiment, the protrusion 352 is inserted through the board-side insertion hole 343 and the cover-side insertion hole 363, and then the tip 352A is formed by crushing the tip of the protrusion 352. The outer diameter of the distal end portion 352A is set to be larger than the diameter of the base end portion 352B and the inner diameters of the substrate side insertion hole 343 and the cover side insertion hole 363. As a result, the tip 352A can be locked to the edge of the cover side insertion hole 363 from the outside of the chassis 14 (the side opposite to the chassis 14).

If the tip 352A is formed by crushing the tip of the protrusion 352 in this way, the board cover 60 can be attached to the chassis 14 without using other attachment means such as screws, and the costs associated with the components can be reduced. Can be reduced. The tip 352A can be formed by crushing the tip of the protrusion 352 with a dedicated tool (such as a hammer) or a device and plastically deforming it. Further, when the material of the protrusion 352 is, for example, a synthetic resin, the tip 352A may be formed by a means (heat caulking) that crushes the tip with the tip heated and melted.

<Embodiment 5>
Next, Embodiment 5 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 above embodiment, the protrusion is formed by protruding a part of the chassis 14, but in the backlight device 412 of the present embodiment, the protrusion 452A is separate from the chassis 14 (bottom plate 14a). It is configured.

In this embodiment, as shown in FIG. 13, in the mounting base 50, a bolt 452 is inserted from the inside of the chassis 14, and the tip of the bolt 452 is projected to the outside of the bottom plate 14a to form a protrusion 452A. The protrusion 452A is inserted through the cover side insertion hole 63 and the substrate side insertion hole 43, as in the above embodiment, and can hold the substrate cover 60 and the control substrate 40.

<Embodiment 6>
Next, Embodiment 6 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 512 of the present embodiment, the elastic member 553 is interposed between the protrusion 552 and each inner peripheral surface of the cover side insertion hole 63 and the substrate side insertion hole 43.

Such an elastic member 553 can be formed by, for example, winding a member such as a vinyl tape or a rubber sheet around the outer peripheral surface of the protrusion 552. In addition, the elastic member 553 is not limited to the structure which winds a vinyl tape, a rubber sheet, etc., You may use another member. For example, it is good also as an elastic member by mounting | wearing the protrusion 552 with a rubber cap. With such a configuration, when the protrusion 552 is inserted into the cover side insertion hole 63 and the board side insertion hole 43, the protrusion 552 is less likely to be removed from the insertion holes 63, 43, and the substrate cover 60 (and The control board 40) can be held more securely with respect to the chassis 14. The elastic member 553 may be disposed only at a location corresponding to the cover side insertion hole 63 (or the substrate side insertion hole 43).

Further, in the present embodiment, the protrusion 552 has a tapered shape in which the tip end tapers toward the tip. With such a configuration, the protrusion 552 can be easily inserted into the insertion holes 63 and 43, and workability is improved.

<Embodiment 7>
Next, Embodiment 7 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 above embodiment, the configuration in which 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, The control board 40 and the board cover 60 are configured to be attached simultaneously with screws B1.

On the other hand, in the backlight device 612 of the present embodiment, the control board 40 is attached to the chassis 14 by screws B2 (screw members) different from the screws to which the board cover 60 is attached. The tip of the screw B2 is screwed to the mounting base portion 50A. The cover side insertion hole 663 formed in the substrate cover 60 is configured such that the head B2A of the screw B2 (the portion protruding from the chassis 14 in the screw B2) is inserted.

That is, in the present embodiment, the screw B2 is a projecting portion. With such a configuration, the protrusion can be easily formed. Further, if the screw B2 for attaching the control board 40 is used as a protrusion, it is not necessary to separately form a protrusion, and the cost for forming the protrusion can be reduced.

<Eighth embodiment>
Next, an eighth embodiment 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 712 of the present embodiment, a circuit board 770 (for example, an inverter board) different from the control board 40 is attached to the mounting base portion 750A by screws B3. The head B3A of the screw B3 is configured to be inserted into the substrate side insertion hole 743 formed in the substrate cover 60. A screw attached to the chassis 14 as in the present embodiment can be used as a protrusion regardless of the use of the screw. Moreover, you may use the screw for attaching members other than a board | substrate as a protrusion.

<Ninth Embodiment>
Next, Embodiment 9 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 said embodiment, the structure by which the protrusion was formed in the attachment base part 50A (or 750A) was illustrated. On the other hand, in the backlight device 812 of the present embodiment, the screw B4 (protrusion) is screwed to a location other than the mounting base portion 50A on the bottom plate 14a of the chassis 14. Then, the screw B4 is inserted into the substrate side insertion hole 743 formed in the substrate cover 760. Thus, the formation part of a protrusion is not limited to the attachment base part 50, What is necessary is just to be formed in the chassis 14. FIG.

<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) The shape of the cover side insertion hole and the protrusion, the formation location, the number, and the like are not limited to those of the above configuration and can be changed as appropriate. For example, the protrusion may be formed in an L shape and the tip of the protrusion faces upward.

(2) 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.

(3) 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 held by the protrusions) can be applied.

(4) In the above embodiment, the cold cathode tube 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.

(5) In the above embodiment, the taper shape or the fillet shape is exemplified as the shape in which the protrusion is tapered toward the tip, but is not limited thereto. Any other shape (for example, a triangular shape) can be applied as long as the protrusion tapers toward the tip.

(6) In the above-described embodiment, the liquid crystal panel and the chassis are illustrated in a vertically placed state in which the short side direction coincides with the vertical direction. However, the liquid crystal panel and chassis coincide with the long side direction in the vertical direction. What was made into the vertically placed state made into the above is also contained in this invention.

(7) In the above embodiment, the TFT is used as the switching element of the liquid crystal display device. However, the present invention can be applied to a liquid crystal display device using a switching element other than the TFT (for example, a thin film diode (TFD)), and performs 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 embodiment, a liquid crystal display device using a liquid crystal panel as the display panel has been illustrated, but the present invention is also applicable to a display device using another type of display panel.

(9) In the above embodiment, the television receiver provided with the tuner is exemplified, but the present invention is also applicable 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, 412, 512, 612, 712, 812 ... Backlight device (illumination device), 14 ... Chassis, 14a ... bottom plate of chassis, 17 ... cold cathode tube (light source), 40 ... control board (circuit board), 43, 143, 243, 343, 743 ... board side insertion hole, 50 ... mounting base (mounting part), 52, 152,252,352,452A, 552 ... projection, 60 ... substrate cover, 63,163,263,363,663, cover side insertion hole (insertion hole), 252A, 352A ... tip (projection end of projection) ), 252B, 352B... Base end (protrusion base end), 553... Elastic member, B2, B3, B4... Screw (screw member), t1.

Claims

A light source;
A chassis that houses the light source;
A circuit board attached to the chassis;
A board cover attached to the chassis and arranged to cover the circuit board,
The mounting portion of the board cover in the chassis is provided with a protrusion that protrudes toward the board cover,
The substrate cover is provided with an insertion hole through which the protrusion is inserted.
The lighting device according to claim 1, wherein the protrusion is formed in a shape in which a protrusion length is equal to or longer than a plate thickness of the substrate cover.
The protruding end portion of the protrusion is formed in a shape in which the width is larger than the width of the base end portion of the protrusion,
The protruding end portion is configured to be engaged with an edge portion of the insertion hole from a side opposite to the chassis side in a state where the base end portion is inserted through the insertion hole. The lighting device according to claim 2.
The protrusion is provided on a bottom plate of the chassis;
The lighting device according to any one of claims 1 to 3, wherein the protrusion is formed so as to be inclined with respect to a direction orthogonal to an extending direction of the bottom plate.
In the circuit board, a board side insertion hole is formed at a position overlapping the insertion hole of the board cover,
The lighting device according to any one of claims 1 to 4, wherein the protrusion is inserted into both the insertion hole and the board side insertion hole.
The circuit board is attached so as to straddle a plurality of attachment portions projecting from the chassis,
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 an elastic member is interposed between the protrusion and the inner peripheral surface of the insertion hole.
The lighting device according to any one of claims 1 to 7, wherein the protrusion is a screw member attached to the chassis.
The lighting device according to claim 8, wherein the screw member attaches the circuit board to the chassis.
The lighting device according to any one of claims 1 to 7, wherein the protrusion is formed integrally with the chassis.
The lighting device according to any one of claims 1 to 10, wherein the protrusion has a shape that tapers toward a tip thereof.
The lighting device according to any one of claims 1 to 11,
And a display panel that performs display using light from the lighting device.
The display device according to claim 12, wherein the display panel is a liquid crystal panel using liquid crystal.
A television receiver comprising the display device according to claim 12 or 13.