JP2009069182A - Display device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display device which is capable of ensuring safety by preventing noxious insects from entering between opposite surfaces of a substrate and a chassis. <P>SOLUTION: In the display device including the substrate having electronic components mounted on one surface thereof and a chassis 51 which has a surface opposed to the other surface of the substrate with a proper length between them and supports the substrate, top faces of first projections 51b and 51b formed on the chassis 51 are brought into contact with the whole peripheral edge parts of inverter circuit board 64 and 64 to surround a space between opposite surfaces of the inverter circuit boards 64 and 64 and the chassis 51, so that noxious insects such as cockroaches are prevented from entering between the opposite surfaces and the safety of a product can be ensured by preventing he occurrence of trouble due to entrance of noxious insects. Furthermore, additional members are unnecessary because the first projections 51b and 51b are formed on the chassis 51. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a display device that can prevent pests from entering and ensure safety.

  A display device such as a liquid crystal display device or a plasma display device includes a display unit having an image display surface, a power supply circuit component that supplies power to the display unit, and an electronic component such as a drive circuit component that drives the display unit. And a housing for housing. In such a display device, the temperature inside the housing increases due to heat generated from the heat generating components such as the display unit and the electronic components. Therefore, a heat radiating port is provided to dissipate the heat from the heat generating components to the outside of the housing. It has been.

  In general, a display device has a plurality of substrates on which electronic components are mounted fixed to a metal chassis that holds a display unit. And the board | substrate with which the electronic component used as a high voltage was mounted, and a chassis keep the space | interval more than a predetermined safe distance so that discharge may not generate | occur | produce from the high voltage terminal of an electronic component to a chassis.

  For example, in a liquid crystal display device that displays light on an image display surface by irradiating light from a light source to a display unit having a liquid crystal panel to control the brightness of each pixel of the liquid crystal panel, a power source is supplied to the light source. The inverter circuit board that supplies is particularly high voltage. Therefore, in the conventional liquid crystal display device, generally, the inverter circuit boards 164, 164 on which the inverter transformers 164a, 164a,... Are mounted are metal chassis that hold the lamps 152, 152,. 151, the substantially cylindrical metal provided at the four corners of the inverter circuit boards 164 and 164 with the inverter circuit boards 164 and 164 and the surface 151a facing the inverter circuit boards 164 and 164 spaced apart from each other by an appropriate length. It is attached via made intervening bodies 108, 108... (See FIGS. 7 and 8). The interposers 108, 108... Are provided so that the inverter circuit boards 164, 164 are attached to the chassis 151 at an appropriate distance so that no discharge occurs, and the inverter circuit boards 164, 164 are provided to be grounded via the chassis 151. is there.

  However, since such a display device such as a liquid crystal display device is used in a general living environment such as a house or an office, a pest such as a cockroach who prefers a warm place may invade from a heat radiation port. If a pest enters the gap between the board on which the high-voltage electronic components such as the inverter circuit boards 164 and 164 are mounted and the chassis 151 having the ground potential, a short circuit may occur, which may cause a malfunction or the like. there were. Further, in order to attach the inverter circuit boards 164 and 164 to the chassis 151 with an appropriate distance from each other and to ground the inverter circuit boards 164 and 164 through the chassis 151, separate members 108, 108. There is a problem that the number of parts increases.

In order to prevent such a decrease in reliability due to pests, a substrate configured to prevent the invasion of pests by vacuum-sealing a substrate on which electronic circuit components are mounted in a bag made of a resin film has been proposed. (For example, refer to Patent Document 1).
JP 2002-134874 A

  However, when the invention disclosed in Patent Document 1 is applied to a display device, it is possible to vacuum-seal the substrates themselves, but the connection portions that connect the substrates and between the substrates and the device main body are the same as the substrates. Since it is difficult to vacuum-seal, there is a problem that it is impossible to prevent the occurrence of defects due to the invasion of pests. In addition, since the entire surface of the substrate is covered with a resin film, there is a problem in that it is difficult to dissipate heat generated by electronic components mounted on the substrate to the outside.

  The present invention has been made in view of such circumstances, and a main object thereof is to form a protruding portion that protrudes toward the substrate on which the electronic component is mounted on the support, and the protruding portion is an abbreviation of the peripheral portion of the substrate. By abutting over the entire circumference, heat dissipation is ensured, and no separate member is required, preventing the invasion of pests between the opposing surfaces of the substrate and the support, and the trouble caused by the invasion of pests An object of the present invention is to provide a display device capable of preventing the occurrence and ensuring the safety of a product.

  Another object is to form a protrusion on the support that protrudes toward the fixed plate to which the board on which the electronic component is mounted is fixed, and apply the protrusion to the entire periphery of the peripheral edge of the fixed plate. For example, by securing a plurality of substrates to a fixed plate, heat dissipation is ensured, and insects are prevented from entering between the opposing surfaces of the substrate and the support to ensure product safety. An object of the present invention is to provide a display device that can improve the efficiency of incorporating a substrate into a support.

  Another object is to interpose between the substrate on which the electronic component is mounted and the support, and to bring the opening end of the fixed base having a one-side-opened housing shape into contact with the support over substantially the entire circumference. By fixing a plurality of substrates to a fixed base, heat dissipation can be ensured, and insects can be prevented from entering between the opposing surfaces of the substrate and the support to ensure product safety. An object of the present invention is to provide a display device that can improve the efficiency of assembling the device into a support.

  The display device according to the present invention is a display device comprising: a substrate on which an electronic component is mounted on one surface; and a support member that has a surface facing and spaced apart from the other surface of the substrate, and that supports the substrate. The support has a protrusion that protrudes toward the substrate so as to surround a space between the substrate and the opposing surface of the support, and abuts over substantially the entire circumference of the peripheral edge of the other surface of the substrate. It is characterized by.

  According to the present invention, a protrusion that protrudes toward the board on which the electronic component is mounted is formed on the support, and the protrusion is brought into contact with the entire periphery of the peripheral edge of the other surface of the board. Since the space between the opposing surfaces of the substrate and the support body is enclosed, the invasion of pests between the opposing surfaces is prevented without the need for a separate member, thereby preventing the occurrence of problems due to the intrusion of the pests. , Can ensure the safety of the product. In addition, heat generated in the electronic components mounted on the board is radiated from one surface of the board to the air, while heat is radiated from the other side of the board to the outside air through the support, so that heat dissipation can be ensured. it can.

  Further, a display device according to the present invention is a display device comprising: a substrate on which an electronic component is mounted on one surface; and a support member that has a surface that faces the other surface of the substrate so as to be spaced apart and supports the substrate. The substrate includes a fixed plate fixed on one surface, and the support projects toward the fixed plate so as to surround a space between the fixed plate and the opposing surface of the support, and the fixed plate It has the protrusion part contact | abutted over the perimeter of the peripheral part of the other surface.

  In this invention, the substrate on which the electronic component is mounted is fixed to one surface of the fixing plate, and a protruding portion protruding toward the fixing plate is formed on the support, and the protruding portion is formed on the other surface of the fixing plate. Since the space between the opposing surfaces of the fixing plate and the support body is made to contact substantially the entire periphery of the peripheral portion, the invasion of the pests between the opposing surfaces is prevented, and the intrusion of the pests Occurrence of defects can be prevented and product safety can be ensured. In addition, for example, by fixing a plurality of substrates to one fixed plate, the number of steps for assembling into the support can be reduced, and the method of fixing the substrate to the fixed plate directly attaches the substrate to the support. Workability is better than mounting individually, and assembly efficiency can be improved. Furthermore, the heat generated in the electronic components mounted on the board is radiated from the one side of the board to the air, while the heat is radiated from the other side of the board to the outside air via the fixing plate and the support, ensuring heat dissipation. can do.

  Further, a display device according to the present invention is a display device comprising: a substrate on which an electronic component is mounted on one surface; and a support member that has a surface that faces the other surface of the substrate so as to be spaced apart and supports the substrate. A fixing base interposed between the substrate and the support body and having a housing shape with an opening on one side, the fixing base being in contact with the support body over the entire circumference. Features.

  In this invention, a fixing base having a housing shape with one opening is interposed between the substrate on which the electronic component is mounted and the support, and the opening end of the fixing base is used as the support over the entire circumference. Since they are in contact with each other, it is possible to prevent the invasion of pests between the opposing surfaces of the substrate and the support, prevent the occurrence of problems due to the intrusion of the pests, and ensure the safety of the product. In addition, for example, by fixing a plurality of substrates to one fixed base, the number of steps for assembling into the support body can be reduced. In addition, fixing a substrate to the fixed base individually attaches the substrate directly to the support body. It is easier to work than attaching to the housing, and the efficiency of assembly can be improved. In addition, the heat generated by the electronic components mounted on the board is radiated from the one side of the board to the air, while the heat is radiated from the other side of the board to the outside via the fixing base and the support, ensuring heat dissipation. can do.

  According to the present invention, the protrusion formed on the support is brought into contact over substantially the entire periphery of the substrate, thereby ensuring heat dissipation and without requiring a separate member, the substrate and the support. It is possible to prevent pests from entering between the opposing surfaces of the, prevent occurrence of defects due to the intrusion of pests, and ensure product safety.

  In addition, according to the present invention, the projecting portion formed on the support is brought into contact with the entire periphery of the peripheral portion of the fixing plate to which the substrate is fixed, thereby ensuring heat dissipation and the substrate and the support. It is possible to prevent pests from entering between the opposing surfaces of the, prevent occurrence of defects due to the intrusion of pests, and ensure product safety. In addition, for example, by fixing a plurality of substrates to one fixed plate, the number of steps for assembling into the support can be reduced, and the method of fixing the substrate to the fixed plate directly attaches the substrate to the support. Workability is better than mounting individually, and assembly efficiency can be improved.

  In addition, according to the present invention, heat dissipation can be achieved by bringing the opening end of a fixed base, which is interposed between the substrate and the support and has a housing shape with one opening, into contact with the support over substantially the entire circumference. In addition to ensuring, the invasion of pests between the opposing surfaces of the substrate and the support can be prevented, the occurrence of problems due to the invasion of pests can be prevented, and the safety of the product can be ensured. In addition, for example, by fixing a plurality of substrates to one fixed base, the number of steps for assembling into the support body can be reduced. It is easier to work than attaching to the housing, and the efficiency of assembly can be improved.

Hereinafter, the present invention will be described in detail by taking a liquid crystal television as an example based on the drawings showing the embodiments.
(Embodiment 1)
FIG. 1 is a perspective view showing a configuration of a display device according to Embodiment 1 of the present invention.

  In the figure, reference numeral 1 denotes a display unit comprising a liquid crystal panel having a display surface 1a for displaying an image on the front side and an optical sheet such as a diffusion plate arranged on the rear side of the liquid crystal panel.

  A rectangular frame-like frame 2 is fitted on the front side of the display unit 1 so as to surround the peripheral portion of the display surface 1a, and a rear cover 3 covering the rear side of the display unit 1 is fitted to the frame 2. It is. The display unit 1 held by the frame 2 and the rear cover 3 is supported in a standing state by a stand 4.

  On the rear side of the display unit 1, a backlight unit including a light source that irradiates the display unit 1 with light is provided. FIG. 2 is a schematic perspective view showing the configuration of the rear side of the backlight unit. 3 is a partial cross-sectional view taken along line III-III in FIG. 2, and FIG. 4 is a partial cross-sectional view taken along line IV-IV in FIG.

  The backlight unit 5 includes a metal chassis 51 having a housing shape with an opening on the entire surface, and the chassis 51 is integrated with the display unit 1 on the opening side. On both sides of the rear surface 51a of the chassis 51, as shown in FIG. 2, elongated first projecting portions 51b and 51b that project in a direction perpendicular to the rear surface 51a and whose longitudinal direction is the longitudinal direction are formed. Further, as shown in FIG. 2, an annular second projecting portion 51c projecting in a direction orthogonal to the rear surface 51a is formed at the center of the rear surface 51a of the chassis 51. The first projecting portions 51b and 51b and the second projecting portion 51c are formed so as to protrude with substantially the same thickness by extrusion or the like so that they have substantially the same height over the entire circumference. is there.

  Inside the chassis 51, a plurality of lamps 52, 52,... Are housed and held side by side on the rear side of the optical sheet and irradiate light to the optical sheet side. The lamps 52, 52... Are cold cathode fluorescent lamps having a substantially cylindrical shape, and have electrodes at both ends.

  A control circuit board 61 on which a control circuit for driving and controlling the display unit 1 is mounted is attached to the upper side of the rear surface 51 a of the chassis 51. At the center of the rear surface 51a of the chassis 51, a rectangular flat plate-shaped fixing plate 7 is screwed into a plurality of screw holes 51e, 51e... Provided on the top surface of the second projecting portion 51c in the circumferential direction. 66... Are fixed by screwing.

  On the fixed plate 7, a main circuit board 62 on which main circuit parts for processing an image displayed on the display unit 1 are mounted, and a power circuit board on which power circuit parts for supplying a voltage to the main circuit board 62 are mounted. 63 are juxtaposed and fixed by screws 67, 67. The second projecting portion 51 c is formed in an annular shape having an inner circumference slightly smaller than that of the fixed plate 7 so as to contact the entire periphery of the peripheral portion of the fixed plate 7. The projecting height of the second projecting portion 51c is such that the main circuit board 62 and the power supply circuit board 63 and the chassis 51 opposite to the main circuit board 62 and the power supply circuit board 63 are prevented from discharging from the high voltage terminals of the main circuit board 62 and the power supply circuit board 63 to the chassis 51. The rear surface 51a is determined so as to maintain an interval equal to or greater than a predetermined safety distance.

  Further, on both sides of the rear surface 51a of the chassis 51, two inverter circuit boards 64 and 64 having a long and narrow rectangular plate shape are provided, with the longitudinal direction of the inverter circuit boards 64 and 64 as shown in FIG. Screws 66, 66... Are screwed into a plurality of screw holes 51d,... 51d spaced apart in the circumferential direction on the top surfaces of the first protrusions 51b, 51b.

  On the inverter circuit boards 64, 64, a plurality of inverter transformers 64a, 64a... Shown in a flat rectangular parallelepiped in the figure are juxtaposed in the vertical direction. The first protrusions 51b and 51b are formed in an annular shape having an inner circumference slightly smaller than that of the inverter circuit boards 64 and 64 so as to be in contact with the entire circumference of the periphery of the inverter circuit boards 64 and 64. is there. The projecting heights of the first projecting portions 51b, 51b are opposed to the inverter transformers 64a, 64a,... And the inverter transformers 64a, 64a, so that no discharge occurs from the high-voltage terminals of the inverter transformers 64a, 64a. The rear surface 51a of the chassis 51 is determined so as to maintain an interval of a predetermined safety distance or more.

  The voltage input to the inverter circuit boards 64, 64 is boosted by the inverter transformers 64a, 64a ..., and supplied to the electrodes provided at both ends of the lamps 52, 52 ... via lead wires (not shown). The lamps 52, 52... Emit light by the supplied voltage, and the display unit 1 is irradiated with light by the emitted light. By this light irradiation, the brightness of each pixel is controlled by the light transmittance corresponding to a predetermined gradation voltage in each pixel of the liquid crystal panel of the display unit 1, and an image is displayed on the display surface 1a.

  In the display device configured as described above, the top surfaces of the first projecting portions 51b and 51b formed on the chassis 51 are brought into contact with the entire periphery of the peripheral portion of the inverter circuit boards 64 and 64, thereby Since the space between the opposing surfaces of the circuit boards 64 and 64 and the chassis 51 is enclosed, it is possible to prevent the entry of insects such as cockroaches between the opposing surfaces of the inverter circuit boards 64 and 64 and the chassis 51, It is possible to ensure the safety of the product by preventing the occurrence of defects due to the invasion of pests. In addition, since the first projecting portions 51b and 51b are formed on the chassis 51, the distance between the opposing surfaces of the inverter circuit boards 64 and 64 and the chassis 51 is not less than a predetermined safety distance without requiring a separate member. The inverter circuit boards 64 and 64 can be attached to the chassis 51 while being maintained, and the inverter circuit boards 64 and 64 can be grounded via the chassis 51.

  Further, the top surface of the annular second projecting portion 51 c formed on the chassis 51 is brought into contact with the entire periphery of the peripheral portion of the fixing plate 7 so as to surround the space between the fixing plate 7 and the facing surface of the chassis 51. Therefore, the invasion of insects such as cockroaches between the opposing surfaces of the main circuit board 62 and the power circuit board 63 and the chassis 51 can be prevented, and the occurrence of defects due to the invasion of the insects can be prevented. Safety can be ensured. Since the two boards of the main circuit board 62 and the power supply circuit board 63 are attached to the single fixing plate 7 and the fixing plate 7 is fixed to the chassis 51, the number of assembling steps into the chassis 51 can be reduced. . Fixing the main circuit board 62 and the power circuit board 63 to the fixing plate 7 has better workability and improving the assembly efficiency than attaching the main circuit board 62 and the power circuit board 63 directly to the chassis 51. Can do.

  Further, the heat generated in the electronic components mounted on the main circuit board 62, the power supply circuit board 63, and the inverter circuit boards 64, 64 is radiated from one surface of these boards 62, 63, 64, 64 to the air, while the board Since heat is radiated from the other surface of 62, 63, 64, 64 to the outside air via the fixing plate 7 and / or the chassis 51, heat dissipation can be ensured.

  In the present embodiment, screw holes 51d,... 51d are provided on the top surfaces of the first protrusions 51b, 51b. However, the present invention is not limited to this. For example, a chassis other than the first protrusions 51b, 51b. 51 may be provided with a screw hole. The same applies to the second protrusion 51c.

(Embodiment 2)
FIG. 5 is a schematic perspective view showing the configuration of the back side of the backlight unit of the display device according to Embodiment 2, and FIG. 6 is a partial cross-sectional view taken along line VI-VI in FIG.

  At the center of the rear surface 51a of the chassis 51, a fixed base 70 having a housing shape with an opening on one surface is attached. The fixing base 70 includes a flat plate portion 70a, a peripheral wall portion 70b extending in a direction substantially orthogonal to the periphery of the flat plate portion 70a, and a flange portion extending outwardly from the end portion of the peripheral wall portion 70b in parallel with the flat plate portion 70a. 70c, the opening side is brought into contact with the rear surface 51a of the chassis 51 over the entire circumference, and the screws 66, 66 ... are screwed into the screw holes 51f, 51f ... provided in the chassis 51. Fixed.

  A main circuit board 62 on which a main circuit component for processing an image displayed on the display unit 1 and a power supply circuit component for supplying a voltage to the main circuit board 62 are mounted on the flat plate portion 70a of the fixed base 70. A power circuit board 63 is juxtaposed and fixed by screws 67, 67. The height of the peripheral wall portion 70b of the fixed base 70 is such that the main circuit board 62 and the power supply circuit board 63 and the chassis facing the main circuit board 62 and the power supply circuit board 63 are prevented from discharging from the high voltage terminals of the main circuit board 62 and the power supply circuit board 63 to the chassis 51. The rear surface 51a of 51 is determined so as to maintain an interval of a predetermined safety distance or more. Since the other configuration is the same as that of the first embodiment shown in FIG. 2, the same reference numerals as those in FIG. 2 are attached to the corresponding components, and detailed description of the configuration is omitted.

  In the display device according to the second embodiment configured as described above, the fixed base 70 having the flat plate portion 70a to which the main circuit board 62 and the power supply circuit board 63 are fixed is connected to the peripheral wall portion 70b of the fixed base 70. Since the end portion is in contact with the chassis 51 over the entire circumference, it is possible to prevent the invasion of insects such as cockroaches between the opposing surfaces of the main circuit board 62 and the power circuit board 63 and the chassis 51, It is possible to ensure the safety of the product by preventing the occurrence of defects due to the invasion of pests. In addition, since the two boards of the main circuit board 62 and the power supply circuit board 63 are attached to one fixed base 70 and the fixed base 70 is fixed to the chassis 51, the number of steps for assembling the chassis 51 can be reduced. In addition, fixing the substrate to the fixing base 70 has better workability than mounting the substrates directly to the chassis 51, and can improve assembling efficiency.

  Further, heat generated in the electronic components mounted on the main circuit board 62 and the power supply circuit board 63 is radiated to the air from one surface of the substrates 62 and 63, while the fixing base 70 and the heat are generated from the other surface of the substrates 62 and 63. Since heat is radiated to the outside air through the chassis 51, heat dissipation can be ensured.

  In the present embodiment, in order to attach the fixing base 70 to the chassis 51, the flange part 70c extending in parallel with the flat plate part 70a is provided outward from the end of the peripheral wall part 70b of the fixing base 70. However, the present invention is not limited to this, and the fixing base 70 may be configured to be attachable to the chassis 51.

  In the above embodiment, the main circuit board 62, the power supply circuit board 63, and the inverter circuit boards 64 and 64 have a pest and the like between the opposing surfaces while the board and the chassis 51 are opposed to each other with an appropriate distance. Although it is configured not to enter, the control circuit board 61 may be configured similarly.

  In the above embodiment, the liquid crystal television has been described as an example of the display device. However, the present invention is not limited to this, and the present invention can be applied to display devices such as liquid crystal display devices other than the liquid crystal television, plasma display devices, and EL displays. In addition, it goes without saying that various modifications can be made within the scope of the matters described in the claims.

It is a perspective view which shows the structure of the display apparatus which concerns on Embodiment 1 of this invention. It is a typical perspective view which shows the structure of the back side of a backlight part. It is a fragmentary sectional view by the III-III line of FIG. It is a fragmentary sectional view by the IV-IV line of FIG. FIG. 10 is a schematic perspective view illustrating a configuration of a rear side of a backlight unit of a display device according to Embodiment 2. It is a fragmentary sectional view by the VI-VI line of FIG. It is a typical perspective view which shows the structure of the back side of the backlight part of the display apparatus which concerns on the conventional embodiment. It is a fragmentary sectional view by the VIII-VIII line of FIG.

Explanation of symbols

51 Chassis (support)
51b First protrusion (protrusion)
51c 2nd protrusion part (protrusion part)
62 Main circuit board (board)
63 Power circuit board (board)
64 Inverter circuit board (board)
7 fixed plate 70 fixed base

Claims (3)

  A display device comprising: a substrate on which an electronic component is mounted on one surface; and a support member that has a surface facing the other surface of the substrate so as to be spaced apart from the substrate. The support member supports the substrate and the support member. A display that protrudes toward the substrate so as to surround a space between opposing surfaces of the body, and has a protrusion that contacts the entire periphery of the peripheral portion of the other surface of the substrate. apparatus.   In a display device comprising: a substrate on which an electronic component is mounted on one surface; and a support member that is spaced apart from the other surface of the substrate and supports the substrate, and the substrate is fixed to the one surface. A support plate that protrudes toward the fixed plate so as to surround a space between the fixed plate and the opposing surface of the support, and has a substantially entire circumference of a peripheral portion of the other surface of the fixed plate. A display device having a projecting portion that is in contact with each other.   A display device comprising: a substrate on which an electronic component is mounted on one surface; and a support member that has a surface facing the other surface of the substrate so as to be spaced apart from the substrate, and is interposed between the substrate and the support member. A display device comprising: a fixed base having a housing shape with an opening on one surface, wherein the fixed base is in contact with the support body over an entire circumference.

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