JP4969543B2 - Light source device and display device including the same - Google Patents

Description

  The present invention relates to a light source device used as a light source of a display device such as a liquid crystal display device and a display device including the same.

  In a display device such as a television, a light source device is disposed on the rear side of a display unit having a display surface for displaying an image on the front side.

A display device in which the light source device is used has a display surface on the front side, and a frame chassis that supports the display panel on the rear side of the display panel that forms a substantially rectangular parallelepiped, and a plurality of pieces mounted on the rear surface of the frame chassis A circuit board. Two reinforcing ribs are mounted on the rear surface of the frame chassis so as to be spaced apart from each other in parallel. The circuit board is disposed between the two reinforcing ribs on the rear surface so as to be spaced apart from the rear surface. An inflow space is provided between the rear surface of the frame chassis and the circuit board by providing an inflow space between the edge and the lower reinforcing rib and an outflow space between the upper edge of the circuit board and the upper reinforcing rib. The heat generated by the circuit board is cooled by causing the air flowing into the inflow space to flow out of the outflow space through the air passage (see, for example, Patent Document 1).
JP 2003-173147 A

  However, in the display device configured as in Patent Document 1, since the circuit board is arranged separately from the rear surface of the frame chassis, it obstructs the thinning of the light source device.

  The present invention has been made in view of such circumstances, and a main object of the present invention is to support a circuit board on the other surface of the support having a substantially rectangular plate that supports a light source on one side, and a part of the support. By attaching a base plate having a notched portion that has been removed and attaching the second circuit board to a portion of the plate portion corresponding to the notched portion, the heat generated by the second circuit board is directly applied to the base plate. An object of the present invention is to provide a light source device and a display device that can prevent transmission and suppress an increase in temperature of a circuit board supported by a base plate.

  The light source device according to the present invention includes a support having a substantially rectangular plate portion that supports a light source on one surface, and the other surface of the plate portion supports a circuit board and is partially omitted. A base plate having a notch portion is attached, and a second circuit board is attached to a portion of the plate portion corresponding to the notch portion.

  In this invention, a circuit board with a relatively small amount of heat generation is supported by a base plate, a notch portion is provided in a part of the base plate, and a portion corresponding to the notch portion in the plate portion is relatively Since the second circuit board having a large amount of heat generation is attached and the heat generated by the second circuit board is prevented from being directly transferred to the base plate, the circuit board is generated by the heat generated by the second circuit board. The temperature of the substrate can be prevented from rising, and the durability of the circuit board, and thus the durability of the light source device can be improved.

In the light source device according to the present invention, the base plate is provided with two reinforcing rods that reinforce the base plate at spaced positions, and the notch is disposed between the reinforcing rods. A configuration is preferable.
In this invention, since the two reinforcing rods are integrated with the base plate and the base plate is reinforced, the bending elastic modulus of the base plate can be increased by the reinforcing rod, and the Since the rigidity around the two circuit boards can be increased, the second circuit board can be protected, and the durability of the second circuit board and hence the durability of the light source device can be improved.

Moreover, it is preferable that the light source device according to the present invention has a configuration in which a peripheral edge portion of the notched portion is coupled to each of the reinforcing rods.
In the present invention, the peripheral portion of the notch portion is integrated with the reinforcing rod, and the rigidity of the peripheral portion of the notch portion can be increased, so that the second circuit board can be protected, and the second circuit The durability of the substrate, and thus the durability of the light source device can be improved.

In the light source device according to the present invention, it is preferable that the periphery of the notched portion has a protrusion that protrudes in the thickness direction of the base plate.
In this invention, since the rigidity of the peripheral portion of the notch portion can be enhanced by the ridges, the second circuit board can be protected, and the durability of the second circuit board, and consequently the durability of the light source device. Can increase the sex.

Moreover, it is preferable that the light source device according to the present invention has a configuration in which the notched portion has a concave shape opened to a part of the periphery of the base plate.
In this invention, since the conducting wire connected to the second circuit board can be connected from the open portion of the notch portion, the connecting workability of the conducting wire can be improved.

Moreover, it is preferable that the light source device according to the present invention has a configuration in which the notched portion is a through-hole.
In this invention, the strength reduction due to the notch portion of the base plate can be suppressed, and the durability of the base plate can be enhanced.

The light source device according to the present invention preferably includes a second base plate that supports the second circuit board, and the second base plate is attached to the plate portion.
In this invention, since the second circuit board can be prevented from coming into direct contact with the plate portion, heat generated by the second circuit board can be suppressed from being transmitted to the plate portion, The durability of the two-circuit board, and thus the durability of the light source device can be enhanced.

In addition, a display device according to the present invention includes a display unit having a display surface on the front side and the light source device of the above-described invention disposed on the back side of the display unit.
In this invention, a circuit board with a relatively small amount of heat generation is supported by a base plate, a notch portion is provided in a part of the base plate, and a portion corresponding to the notch portion in the plate portion is relatively Since the second circuit board having a large heat generation amount is attached to prevent the heat generated by the second circuit board from being directly transferred to the base plate, the heat generated by the second circuit board causes the circuit board to The rise in temperature can be suppressed, and the durability of the circuit board and thus the durability of the display device can be improved.

  According to the present invention, the heat generated by the second circuit board having a relatively large amount of heat generation can be prevented from being directly transferred to the base plate, so that the temperature of the circuit board is reduced by the heat generated by the second circuit board. The rise can be suppressed, and the durability of the circuit board and the second circuit board supported by the base plate, and thus the durability of the light source device and the display device can be enhanced.

  Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof. 1 is a rear view showing the configuration of the light source device incorporated in the display device, FIG. 2 is a rear view showing the configuration of the light source device with the base plate removed, and FIG. 3 shows the circuit board removed from the base plate of the light source device. FIG. 4 is an enlarged sectional view showing the configuration of the main part of the light source device, FIG. 5 is a rear view showing the configuration of the base plate, and FIG. 6 is an enlarged view of the state where the peripheral portion of the light source device is omitted. FIG. 7 is a rear view, FIG. 7 is an enlarged rear view showing the configuration of the main part of the light source device, FIG. 8 is a perspective view showing the configuration of the second reinforcing rod, and FIG. 9 is a schematic cross-sectional view showing the configuration of the light source portion of the light source device. FIG. 10 is a schematic cross-sectional view showing the configuration of the light source device, and FIG. 11 is a schematic explanatory view showing the configuration of the light source.

  The illustrated light source device has a display surface on the front side and is mounted on the rear side of the display unit in a thin display device having a display unit having a substantially rectangular parallelepiped shape. A diode 1, a plurality of light emitting diode substrates 2 on which the light emitting diodes 1 are mounted, a support 3 that supports the light emitting diode substrates 2 side by side, and a plurality of conductors that guide light emitted from the light emitting diodes 1 in the lateral direction. An optical plate 4 and a plurality of reflecting plates 5 that reflect the light guided by the light guide plate 4 in a direction opposite to the support 3 are provided.

  The support 3 is formed by forming a metal plate, has a substantially rectangular flat plate portion 31, and supports a plurality of light emitting diode substrates 2 side by side in the longitudinal direction and the width direction on one surface of the plate portion 31. In addition, a heat radiating plate 30 that dissipates heat generated by the light emitting diode 1 from the light emitting diode substrate 2 to the plate portion 31 is interposed between the light emitting diode substrate 2 and the plate portion 31. In addition, a plurality of connection holes 32 for connecting the light emitting diode substrates 2 juxtaposed in the longitudinal direction of the plate portion 31 to each other by a conducting wire and a plurality of attachments for individually attaching the light guide plates 4 to the plate portion 31 are also provided. A hole 33 is opened. Further, a step portion 34 that is biased in the plate thickness direction is provided at the peripheral portion of the plate portion 31, and an elongated shape that supports a part of each light guide plate 4 between the step portion 34 and the light emitting diode substrate 2. The first support plate 11 is attached, and an elongated second support plate 12 that supports an optical sheet to be described later is attached to the peripheral side of the step portion 34.

  The light emitting diode substrate 2 has a substantially rectangular shape, the light emitting diode 1 is mounted on one surface, and is mounted side by side on one surface of the plate portion 31.

  The light guide plate 4 has a light incident surface 4a and a light exit surface 4b that irradiates light incident on the light incident surface 4a in a direction substantially orthogonal to the light incident surface 4a, and faces one side of the light emitting diode 1. The light incident surface 4a is disposed at a position where the light is incident, the light exit surface 4b is disposed at a position facing the rear surface of the display unit, and the reflector 5 is attached to the surface opposite to the light exit surface 4b. .

  As described above, the power supply circuit board 13 that supplies power to the display unit and the image displayed on the display surface of the display unit are processed on the other surface of the plate unit 31 on which the light-emitting diode substrate 2 is attached. A base plate 6 that supports a plurality of circuit boards such as a terminal circuit board 14 to be supported is supported, and two reinforcing rods 7 and 7 that reinforce the base plate 6 are attached to the base plate 6. Further, on the other surface of the plate portion 31, two second reinforcing rods 8 and 8 for reinforcing the plate portion 31 at positions separated by a relatively long distance in the longitudinal direction, and the second reinforcing rods 8 and 8 Between the fourth reinforcement rods 9 and 9 that are juxtaposed at a relatively short distance and reinforce the plate portion 31, one end of the second reinforcement rods 8 and 8 and the fourth reinforcement rods 9 and 9, and the long side of the plate portion 31. And the third reinforcement rod 10 which is coupled to the end portions of the second reinforcement rods 8 and 8 and the fourth reinforcement rods 9 and 9 and reinforces the plate portion 31 through a plurality of spacer members 60. It is attached with a screw.

  The base plate 6 is formed by molding a metal plate, and supports the power circuit board 13 and the terminal circuit board 14 on one surface, and has a substantially rectangular support plate portion 61 and one surface side from both longitudinal edges of the support plate portion 61. Two first projecting pieces 62, 62 projecting to the second, second projecting pieces 63, 63 as attached portions projecting outward from the tips of the first projecting pieces 62, 62, and other support plate 61 It has the 3rd protrusion 64 which protrudes to one surface side from one of two opposing edges, and the 4th protrusion 65 which protrudes to the other surface side from the other two other edges of the support plate part 61. The second projecting pieces 63 and 63 are attached to the two second reinforcing rods 8 and 8 by male screws, the third projecting piece 64 is attached to the third reinforcing rod 10 by male screws, and the fourth projecting piece 65 is a plate. It is attached to the part 31 by a male screw.

  Between the longitudinal ends of the support plate portion 61, two reinforcing rods 7 and 7 for reinforcing the base plate 6 are attached to be separated in the longitudinal direction, and a power source is interposed between the reinforcing rods 7 and 7 in the longitudinal direction. Two fixing rods 15 and 15 for supporting the circuit board 13 are attached, and a notch portion 66 corresponding to the control circuit board 16 is provided between the reinforcing rods 7 and 7 in the longitudinal center portion of the support plate portion 61. Is provided.

  The notched portion 66 is a through-hole that is opened in a concave shape on the long side of the support plate portion 61, and two opposite edge portions of the periphery of the notched portion 66 are coupled to the reinforcing rods 7 and 7. A second base plate 17 that supports the control circuit board 16 that generates a relatively large amount of heat is attached to the exposed position of the plate portion 31 exposed by the notch portion 66 by a plurality of male screws. Further, on the two opposing edge portions of the peripheral edge of the cut-out portion 66, ridges 67, 67 protruding to one surface side of the base plate 6 are provided.

  The reinforcing rods 7 and 7 are formed by forming a metal plate into a U-shaped cross section, are formed to have a length slightly shorter than the width of the support plate portion 61, and are formed by a plurality of male screws so that the groove faces the support plate portion 61. It is attached to the support plate part 61.

  The fixing rod 15 is formed by molding a metal plate with a relatively narrow width, and is arranged so as to straddle one reinforcing rod 7 from the second reinforcing rod 8 arranged on one side in the longitudinal direction of the plate portion 31. It is formed in a length that reaches the other reinforcing rod 7, and fixed portions are provided at three locations, both ends and the middle. The fixing rod 15 is juxtaposed in the longitudinal direction of the reinforcing rods 7, 7, the fixing portion at one end is attached to the middle in the longitudinal direction of the second reinforcing rod 8 with a male screw, and the fixing portion at the other end and the intermediate fixing The portion is attached with a male screw in the middle in the longitudinal direction of the two reinforcing rods 7, 7, the portion between the reinforcing rods 7, 7 in the two fixing rods 15, 15, one second reinforcing rod 8 and one The power supply circuit boards 13 are respectively attached to the portions between the reinforcing rods 7.

  The power supply circuit board 13 has a substantially rectangular shape with a plurality of components mounted on one surface, and both opposite edges of the power supply circuit board 13 are attached to the fixing rods 15 and 15 by male screws.

  The second reinforcing rod 8 is formed by forming a metal plate into a U-shaped cross section, and is formed to have a length shorter than the width of the plate portion 31. One adjacent second reinforcing rod 8 and the fourth reinforcing rod 9 are juxtaposed on one side in the longitudinal direction of the plate portion 31 at a relatively short distance so that the groove faces the plate portion 31, and the other adjacent The second reinforcing rod 8 and the fourth reinforcing rod 9 are juxtaposed so that the groove faces the plate portion 31 on the other side in the longitudinal direction of the plate portion 31 with a relatively short separation distance. Moreover, the to-be-joined part which has an insertion hole is provided in the both ends of each of the 2nd reinforcement rod 8 and the 4th reinforcement rod 9. FIG.

  The third reinforcing rod 10 is formed by forming a metal plate into a U-shaped cross section, is formed to have a length shorter than the length of the plate portion 31, and two coupled portions are provided at both ends. The third reinforcing rod 10 is arranged in parallel to the long side of the plate portion 31 at a position separated from the edge of the plate portion 31 toward the center side, and the two coupled portions at one end are the second reinforcing rod 8 and the fourth. The reinforcing rod 9 is coupled to the coupled portion at one end of the reinforcing rod 9 by a male screw, and is fixed to the plate portion 31 so that the groove is opposed to the plate portion 31. The two reinforcing rods 8 and the fourth reinforcing rod 9 are coupled to the coupled portions at one end portions thereof by male screws, and are fixed to the plate portion 31 so that the grooves face the plate portion 31.

  On the plate portion 31 between the second reinforcing rod 8 and the fourth reinforcing rod 9 juxtaposed on one side in the longitudinal direction of the plate portion 31, a power circuit board 18 connected to the light emitting diode substrate 2 is provided with a plurality of male members. The plate portion 31 between the second reinforcing rod 8 and the fourth reinforcing rod 9 that are attached by screws and juxtaposed on the other side in the longitudinal direction of the plate portion 31 is connected to the light emitting diode substrate 2 and emits light. A control circuit board 19 for controlling the diode 1 is attached by a plurality of male screws, and a control circuit board for controlling the display section on the opposite side of the third reinforcing rod 10 in the longitudinal center of the plate section 31. 16 is attached by a plurality of male screws.

  Further, the second reinforcing rod 8 and the fourth reinforcing rod 9 juxtaposed on one side in the longitudinal direction of the plate portion 31 are covered with the power circuit board 18 to block electromagnetic waves from the power circuit board 18. The cover 20 is attached by a plurality of male screws, and the second reinforcing rod 8 and the fourth reinforcing rod 9 juxtaposed on the other side in the longitudinal direction of the plate portion 31 are covered with the control circuit board 19, A cover 21 that blocks electromagnetic waves is attached to the control circuit board 19 by a plurality of male screws.

  The support 3 of the light source device configured as described above has two second reinforcing rods 8 and 8 attached at relatively long separation distances on both sides in the longitudinal direction of the plate portion 31, and the second reinforcements on both sides thereof. The base plate 6 is attached to the base plates 8 and 8, the two reinforcing bases 7 and 7 are attached to the base plate 6 apart from each other, and the reinforcing base 7, the base plate 6, and the second reinforcing base 8 are integrated with the plate portion 31. Since it becomes a structure and the board part 31 is reinforced, the bending elastic modulus of the flat support body 3 can be raised.

  A notch 66 is provided between the reinforcing rods 7 and 7 of the base plate 6, and a control circuit board 16 having a relatively large amount of heat generation is attached to a portion corresponding to the notch 66 of the plate 31. Yes, since the heat generated by the control circuit board 16 is prevented from being directly transferred to the base plate 6, the heat generated by the control circuit board 16 causes the power supply circuit board 13, the terminal circuit board 14, etc. It is possible to suppress the temperature of the circuit board supported on the base plate 6 from rising.

  The support body 3 has a third reinforcing rod 10 coupled to one end of two second reinforcing rods 8 and two fourth reinforcing rods 9 to form an integral U-shape. Since the fourth reinforcing rod 9 and the third reinforcing rod 10 are attached to the plate portion 31 of the support 3 and are integrated with the plate portion 31, the bending elastic modulus of the support 3 that is substantially flat is sufficiently large. Can be increased.

  Further, two second reinforcing rods 8 and four reinforcing rods 9 are juxtaposed on one side portion and the other side portion of the plate portion 31 in the longitudinal direction, respectively, and the second reinforcing rod 8 and the fourth reinforcing rod 9 are shielded from electromagnetic waves. Since the covers 20 and 21 are attached and the covers 20 and 21 reinforce the plate portion 31, the bending elastic modulus of the support 3 can be further increased.

  FIG. 12 is a cross-sectional view illustrating a configuration of a display device including the light source device according to the present invention. The display device includes a display unit 40 having a display screen for displaying a television image on the front side, a light source device A disposed on the rear side of the display unit 40, a peripheral portion of the display unit 40, and a rear of the light source device A. And a cabinet 41 covering the side.

  The display unit 40 includes a display panel 42 having a display surface and an optical sheet 43 disposed on the rear side of the display panel 42. The peripheral edge of the display panel 42 is held in front and back by a front holding frame body 44 and a rear holding frame body 45 to constitute a panel module, and the rear holding frame body 45 is formed on the peripheral edge portion of the support 3. Installed.

  The optical sheet 43 includes two relatively thick diffuser plates 43a that diffuse light emitted from the light emitting diode 1 as a light source, and a relatively thin synthetic resin sheet 43b such as a reflective polarizing plate, a prism sheet, and a diffuser sheet. The peripheral edge of the diffusion plate 43 a is supported by the peripheral edge of the support 3 via the second support plate 12.

  The cabinet 41 includes a cabinet front part 41 a that covers the front side of the peripheral part of the display unit 40, and a deep dish-shaped cabinet rear part 41 b that covers the peripheral part and the rear side of the light source device A. It is attached to the periphery of this by a male screw.

  In the light source portion of the display device configured as described above, the second reinforcing rods 8 are attached to the plate portion 31 of the support 3 that supports the control circuit board 16, and the second reinforcing rods 8 on both sides thereof are attached. The base plate 6 is attached to the base plate 6, and the two reinforcing rods 7 and 7 are attached to the base plate 6 at a distance from each other, and the reinforcing rod 7, the base plate 6, and the second reinforcing rod 8 are integrated with the plate portion 31. Since the part 31 is reinforced, the bending elastic modulus of the flat support 3 can be increased.

  FIG. 13 is a rear view showing another configuration of the light source device according to the present invention, and FIG. 14 is a rear view showing another configuration of the base plate. In this light source device, the notch 66 of the base plate 6 is formed as a hole having, for example, a square shape penetrating at a position separated from the long side of the support plate 61, and the plate exposed to the notch 66. The control circuit board 16 is attached to the part 31. Since other configurations and operations are the same as those of the embodiment shown in FIGS. 1 to 7, the same components are denoted by the same reference numerals, and detailed descriptions and descriptions of the operations and effects are omitted.

  In the above-described embodiment, the light emitting diode 1 is provided as a light source. However, a light source having a lamp may be used, and the configuration of the light source is not particularly limited.

  In the embodiment described above, two second reinforcing rods 8 and 8 and fourth reinforcing rods 9 and 9 are juxtaposed on both sides in the longitudinal direction of the plate portion 31, respectively. Although the third reinforcement rod 10 is coupled to one end of the four reinforcement rods 9 and 9, the fourth reinforcement rods 9 and 9 may be omitted.

  In the embodiment described above, the base plate 6 that supports the power supply circuit board 13 and the terminal circuit board 14 is provided, and the control circuit board 16 is attached to a portion corresponding to the notch 66 in the plate 31. However, the configuration of the circuit board is not particularly limited.

It is a rear view which shows the structure of the light source device integrated in the display apparatus which concerns on this invention. It is a rear view which shows the structure of the state which removed the base plate of the light source device which concerns on this invention. It is a rear view which shows the structure of the state which removed the circuit board from the baseplate of the light source device which concerns on this invention. It is an expanded sectional view which shows the structure of the principal part of the light source device which concerns on this invention. It is a rear view which shows the structure of the base plate of the light source device which concerns on this invention. It is an expanded rear view of the state which abbreviate | omitted the peripheral part of the light source device which concerns on this invention. It is an expanded rear view which shows the structure of the principal part of the light source device which concerns on this invention. It is a perspective view which shows the structure of the 2nd reinforcement rod of the light source device which concerns on this invention. It is typical sectional drawing which shows the structure of the light source part of the light source device which concerns on this invention. It is typical sectional drawing which shows the structure of the light source part of the light source device which concerns on this invention. It is typical explanatory drawing which shows the structure of the light source of the light source device which concerns on this invention. It is sectional drawing which shows the structure of a display apparatus provided with the light source device which concerns on this invention. It is a rear view which shows the other structure of the light source device which concerns on this invention. It is a rear view which shows the other structure of the base plate of the light source device which concerns on this invention.

Explanation of symbols

1 Light-emitting diode (light source)
DESCRIPTION OF SYMBOLS 3 Support body 31 Plate part 6 Base plate 66 Deletion part 67 Projection 7 Reinforcement rod 8 Second reinforcement rod 13 Power supply circuit board (circuit board)
16 Control circuit board (second circuit board)
17 Second base plate 40 Display unit A Light source device

Claims (8)

  In the light source device including a support body having a substantially rectangular plate portion that supports the light source on one surface, a base plate having a notch portion that supports the circuit board and is partially removed on the other surface of the plate portion. And a second circuit board is attached to a portion of the plate portion corresponding to the notched portion.   The light source device according to claim 1, wherein the base plate is provided with two reinforcing rods that reinforce the base plate at spaced positions, and the notch portion is disposed between the reinforcing rods.   The light source device according to claim 2, wherein a peripheral edge portion of the notched portion is coupled to each of the reinforcing rods.   4. The light source device according to claim 1, wherein a peripheral edge of the notched portion has a protrusion that protrudes in a thickness direction of the base plate. 5.   The light source device according to any one of claims 1 to 4, wherein the notched portion has a concave shape opened to a part of a peripheral edge of the base plate.   The light source device according to claim 1, wherein the lacking part is a through-hole.   The light source device according to claim 1, further comprising a second base plate that supports the second circuit board, wherein the second base plate is attached to the plate portion.   A display device comprising: a display unit having a display surface on the front side; and the light source device according to claim 1 disposed on the back side of the display unit.

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