JP2008112125A - Thin display device and base plate for circuit board - Google Patents

Abstract

An electronic component mounted on a circuit board can be arranged in a space generated by a reinforcing bar, and the circuit board can be brought close to a display unit without being obstructed by the electronic component. The front and rear thickness can be shortened.
A base plate 8 is provided on a rear side of reinforcing bars 2 and 2 attached to a rear surface 1a of a display unit 1 having a display surface on the front side, and a circuit board on which electronic components are mounted is mounted. The circuit board is disposed so as to face the rear surface 1a, and the circuit board has a mounting thickness at a position facing the reinforcing bars 2 and 2 smaller than a mounting thickness at a position facing the rear surface 1a, and the base plate 8 and the rear surface 1a. The circuit board is accommodated in a space formed between the two.
[Selection] Figure 1

Description

  The present invention relates to a thin display device such as a liquid crystal display device or a plasma display device, and a base plate for a circuit board mounted on the thin display device.

  For example, Patent Document 1 discloses a thin display device such as a liquid crystal television or a plasma television having a display surface for displaying an image on the front side.

  FIG. 8 is a rear perspective view showing a configuration of a conventional thin display device, FIG. 9 is a cross-sectional enlarged plan view, and FIG. 10 is a front perspective view of a base plate on which a circuit board is mounted. The thin display device has a panel section 100 on the front side and a reinforcing bar having a concave cross section at two lateral positions on the rear surface 102a of the display section 102 having a backlight section 101 that irradiates light to the panel section 100 on the rear side. 103, 103 are attached, and a base plate 105 on which a plurality of types of circuit boards 104 are mounted on one surface is disposed on the rear side of the reinforcing bars 103, 103, and a plurality of locations of the base plate 105 are arranged on the rear surface 102a. It is attached with screws.

  A plurality of electronic components 104a are mounted on one surface of the circuit board 104 mounted on the base plate 105, and when the base plate 105 is attached to the rear surface 102a of the display unit 102, as shown in FIG. A base plate 105 is disposed on the rear side of the base plates 103 and 103, and an electronic component 104 a on the circuit board 104 is disposed on the rear side of the base plate 105.

  FIG. 11A is a schematic rear view showing the configuration of a conventional thin display device, and FIG. 11B is a schematic plan view. On the rear surface 102a of the display unit 102 in the thin display device, an inverter circuit board that drives the backlight unit 101, a control circuit board that drives and controls the panel unit 100, and an image displayed on the panel unit 100 are processed. A plurality of circuit boards such as a main circuit board 106 and a power supply circuit board 107 for supplying a voltage to the main circuit board 106 are attached in parallel to the rear surface 102a.

  In these circuit boards, the power supply circuit board 107 generates a predetermined power supply voltage by stepping down the commercial power supply 100V using a transformer, and is disposed on the commercial power supply voltage side of the transformer. A plurality of commercial power supply voltage side (also referred to as primary side or high voltage side) electronic components 107a such as electrolytic capacitors and coils, and a plurality of step-down sides (secondary side or Electronic components 107b on the low-voltage side), and the electronic components 107a and 107b on the commercial power supply voltage side and the step-down side are arranged in random order, and the electronic components 107a and 107b on the commercial power-supply voltage side and the step-down side are It is attached to the rear surface 102a so as to be behind the mounting surface. Further, the power supply circuit board 107 may be disposed at a position facing the reinforcing bar 103 in the layout of the thin display device.

  By the way, in the thin display device in which the power supply circuit board 107 is attached to the rear surface 102a of the display unit 102, the power supply circuit board 107 is a component on the commercial power supply voltage side, and the display unit 102 is a component on the step-down side. As described above, electrical devices such as audio equipment and televisions having components on the commercial power supply voltage side and step-down side are provided with components on the commercial power supply voltage side and components on the buck side according to safety standard IEC 60065 (safety standard of the International Electrotechnical Commission). It is required to secure a reinforced insulation distance (6 mm). However, it is preferable to secure a reinforced insulation distance (7 mm) with a margin in actual use.

FIG. 12 is a perspective view of another circuit board and base plate portion of a conventional thin display device. In addition, on the base plate 105 on which the circuit board 104 is mounted, a deep dish-shaped electromagnetic wave shielding plate 106 that shields the periphery of the electronic components is mounted as shown in FIG. It may be configured to prevent affecting electronic components.
JP 2005-191787 A

  However, as shown in FIGS. 8 to 10, a thin display in which a reinforcing bar 103 is attached to the rear surface 102 a of the display unit 102 and a base plate 105 to which the circuit board 104 is attached is attached to the rear side of the reinforcing bar 103. In the apparatus, since the electronic component 104a mounted on the circuit board 104 is disposed on the rear side of the base plate 105, the electronic component 104a is used when designing to reduce the front and rear thickness of the thin display device. It became an obstacle to shortening the thickness, and an improvement measure was demanded.

  Further, in a thin display device having a layout in which the power supply circuit board 107 is disposed at a position facing the reinforcing bar 103, the power supply circuit board 107 which is a component on the commercial power supply voltage side and the voltage reduction side component which is on the step-down side It is necessary to ensure the reinforced insulation distance defined by the safety standards between the reinforcing bar (display unit) 103 having a ground potential of less than the reinforced insulating distance. Therefore, when designing to reduce the front and rear thickness of the thin display device, the safety standard becomes an obstacle to the thickness reduction.

  In the thin display device in which the reinforcing bar is attached to the rear surface of the display unit according to the present invention, a space corresponding to the reinforcing bar is generated between the base plate disposed on the rear side of the reinforcing bar and the rear surface. Paying attention, the electronic components mounted on the circuit board are arranged in the space so that the thickness of the thin display device can be reduced. In addition, paying attention to the fact that the safety standard does not stipulate the insulation distance between the components on the step-down side, arrange the electronic components on the commercial power supply voltage side and the electronic components on the step-down side separately, The front and rear thickness of the thin display device can be shortened by separating the electronic component from the reinforcing bar.

  That is, the main purpose is to arrange the circuit board on which the electronic component is mounted on one side so that the electronic component faces the rear surface of the display unit, and the mounting thickness of the portion facing the reinforcing bar faces the rear surface. An object of the present invention is to provide a thin display device in which the circuit board can be brought close to the display unit without being obstructed by electronic components by making the mounting thickness of the portion thinner than the mounting thickness, and the overall front and rear thickness can be reduced. .

  Another object is to mount a circuit board on which electronic components are mounted and a base plate disposed on the rear side of the reinforcing bar so that the circuit board faces the rear surface, and the circuit board is reinforced. By making the mounting thickness of the part facing the crosspiece thinner than the mounting thickness of the part facing the rear surface, the circuit board can be brought closer to the display unit without being obstructed by the electronic parts, An object of the present invention is to provide a thin display device capable of shortening the height.

  Another object is to provide a base plate having a plate portion to which the circuit board is attached, and an upright portion that rises from the edge of the plate portion to the circuit board side and is attached to the rear surface. An object of the present invention is to provide a thin display device in which a plate can also be used as an electromagnetic shielding plate.

  Another object is to have a base plate having a plate portion to which the circuit board is attached and a frame portion rising from the periphery of the plate portion to the circuit board side, and facing the reinforcing bar of the frame portion. An object of the present invention is to provide a thin display device in which the base plate can be used also as the electromagnetic wave shielding plate and the electromagnetic wave shielding property by the base plate can be improved by adopting a configuration in which the concave portion is provided at the location.

  Another purpose is to place the mounting component on the commercial power supply voltage side of the circuit board located behind the reinforcing bar on the side that is separated from the reinforcing bar, and the mounting part on the step-down side closer to the reinforcing bar. By arranging, the circuit board can be brought close to the display unit without being restricted by the reinforced insulation distance defined by the safety standard, and between the reinforcing bar and the circuit board having the mounting components on the commercial power supply voltage side and the step-down side. It is an object of the present invention to provide a thin display device that can reduce the distance between the front and rear and the overall front-rear thickness.

  Another object is to arrange the second circuit board disposed behind the reinforcing bar such that the mounting surface faces the rear surface, and the mounting thickness of the portion facing the reinforcing bar is set to the rear surface. It is to provide a thin display device in which the thickness of the second circuit board can be brought closer to the display unit by reducing the mounting thickness of the portion opposed to the display portion, and the thickness of the thin display device can be further reduced. .

  Another object is to provide a base plate on which a circuit board on which a plurality of electronic components are mounted is mounted on one surface, a frame portion that rises from the peripheral portion to the one surface side, and two opposing portions of the frame portion In addition, when the base plate is incorporated into an article such as a thin display device in which the base plate is disposed outside the columnar body by providing a recess to be fitted to the side of the columnar body, the electronic component An object of the present invention is to provide a base plate for a circuit board that can bring the circuit board close to an article such as a thin display device without being obstructed, and can reduce the thickness of the article.

  Another object is to mount a base plate on which a circuit board formed by mounting a plurality of mounting components is mounted on one side to a support member on which the base plate rises from the peripheral portion and is supported by the base plate. When the base plate is incorporated into an article such as a thin display device in which the base plate is arranged outside the columnar body by being configured to have a plurality of raised upper parts, the base plate and the mounting parts are not hindered. An object of the present invention is to provide a base plate for a circuit board that can bring the circuit board close to an article such as a thin display device and can reduce the thickness of the article.

  In the thin display device according to the present invention, a reinforcing bar for reinforcing the display unit and a plurality of electronic components are mounted on the rear surface of the display unit having a display surface on the front side, and disposed on the rear side of the reinforcing bar. In the thin display device to which the circuit board is attached, the circuit board is disposed so that the electronic component faces the rear surface, and the mounting thickness of the part facing the reinforcing bar is the part facing the rear surface. It is characterized by being thinner than the mounting thickness.

  In this invention, since the circuit board is arranged so that the mounted electronic component faces the rear surface of the display unit, the electronic component can be arranged in the space generated by the reinforcing bar, and the circuit Since the mounting thickness of the board facing the reinforcing bar is thinner than the mounting thickness of the board facing the rear surface, the circuit board can be brought close to the display unit without being obstructed by electronic components, and the thin display device The thickness before and after can be shortened.

  In the thin display device according to the present invention, a reinforcing bar for reinforcing the display unit and a circuit board on which an electronic component is mounted are mounted on the rear surface of the display unit having a display surface on the front side. In a thin display device to which a base plate disposed on the rear side is attached, the base plate is disposed such that the circuit board faces the rear surface, and the circuit board is mounted at a location facing the reinforcing bar. Is made thinner than the mounting thickness of the portion facing the rear surface.

  In this invention, since the base plate is disposed so that the mounted circuit board faces the rear surface of the display unit, the electronic component mounted on the circuit board is disposed in the space generated by the reinforcing bar. In addition, since the mounting thickness of the base plate facing the reinforcing bar is thinner than the mounting thickness facing the rear surface, the circuit board can be brought close to the display unit without being obstructed by electronic components. The thickness of the thin display device can be reduced.

  In the thin display device according to the present invention, the base plate includes a plate portion to which the circuit board is attached, and an upright portion that rises from the edge of the plate portion to the circuit board side and is attached to the rear surface. Features.

  In the present invention, since the plate portion is provided on the rear side of the electronic component mounted on the circuit board, the base plate can also be used as the electromagnetic shielding plate. Therefore, there is no need to provide an electromagnetic wave shielding plate separately from the base plate, the structure can be simplified and the weight can be reduced.

  In the thin display device according to the present invention, the base plate includes a plate portion to which the circuit board is attached, and a frame portion that rises from the periphery of the plate portion to the circuit board side. A concave portion is provided at a location facing the reinforcing bar.

  In this invention, there is a plate portion on the rear side of the electronic component mounted on the circuit board, and the frame portion surrounds the electronic component, so that the base plate can be used also as the electromagnetic shielding plate, The electromagnetic wave shielding property by a board can be improved. Therefore, there is no need to provide an electromagnetic wave shielding plate separately from the base plate, the structure can be simplified and the weight can be reduced.

  Further, the thin display device according to the present invention has a reinforcing bar for reinforcing the display unit and a power supply circuit for stepping down the commercial power source on the rear surface of the display unit having a display surface on the front side, and is behind the reinforcing bar. In a thin display device having a circuit board disposed on the side, a mounting component on the commercial power supply voltage side of the power supply circuit is disposed on a side separated from the reinforcing bar, and mounting on the step-down side of the power supply circuit The parts are arranged on the side approaching the reinforcing bar.

  In this invention, the mounting component on the commercial power supply voltage side of the circuit board disposed behind the reinforcing bar is disposed on the side separated from the reinforcing bar, and the stepped-down mounting component is closer to the reinforcing bar. Therefore, the circuit board can be brought close to the display unit without being restricted by the reinforced insulation distance defined by the safety standard, and the circuit board having the reinforcing bars and the components mounted on the commercial power supply voltage side and the step-down side The distance between the two can be shortened, and the thickness of the thin display device can be shortened.

  In the thin display device according to the present invention, the circuit board is disposed so that a mounting surface faces the rear surface, and a mounting thickness of a portion facing the reinforcing bar is set at a position facing the rear surface. It is characterized by being thinner than the mounting thickness.

  In this invention, the mounting surface of the second circuit board disposed on the rear side of the reinforcing bar faces the rear surface of the display unit, and the step-down side component is mounted more than the commercial power supply voltage side component Since the height with respect to the surface is low, the second circuit board can be brought closer to the display unit, and the thickness of the thin display device can be further reduced.

  Further, the base plate for the circuit board according to the present invention has a frame portion that rises from the peripheral portion to the one surface side in a base plate on which a circuit board formed by mounting a plurality of electronic components is mounted on one side, A concave portion to be fitted to a side portion of the columnar body is provided at two opposing portions of the frame portion.

  In this invention, the electronic component can be arranged in the frame portion, and the circuit board can be brought closer to the column shape body by fitting the concave portion provided in the frame portion to the side portion of the column shape body. it can. Accordingly, when the base plate is incorporated in an article such as a thin display device in which the columnar body is attached and the base plate is disposed outside the columnar body, the circuit board is not obstructed by the electronic components, and the thin substrate The thickness of the article can be shortened.

  In addition, the base plate for a circuit board according to the present invention is a base plate on which a circuit board on which a plurality of mounting components are mounted is mounted on one surface, rises from the peripheral portion to the one surface side, and is supported by the base plate. And a plurality of raised portions to be attached to the supporting member.

  In this invention, when the base plate is attached to the support member having the columnar body, the upright portion and the mounting component can be spaced apart to the side of the columnar body, so that the circuit board is brought closer to the columnar body. be able to. Accordingly, when the base plate is mounted on an article such as a thin display device in which the columnar body is attached to the rear surface of the display unit and the base plate is disposed outside the columnar body, the base plate and the mounting parts are obstructed. Therefore, the circuit board can be brought close to an article such as a thin display device, and the thickness of the article can be reduced.

  As described above in detail, according to the present invention, the electronic component can be arranged in the space generated by the reinforcing bar, and the circuit board can be brought close to the display unit without being obstructed by the electronic component. The front and rear thickness of the display device can be shortened.

  Further, according to the present invention, the electronic component mounted on the circuit board can be disposed in the space generated by the reinforcing bar, and the circuit board is brought close to the display unit without being obstructed by the electronic component. The thickness of the thin display device can be reduced.

  Further, according to the present invention, the base plate can be used also as the electromagnetic wave shielding plate, and it is not necessary to provide the electromagnetic wave shielding plate separately from the base plate, the structure can be simplified and the weight can be reduced.

  Further, according to the present invention, the base plate can be used also as the electromagnetic shielding plate, and the electromagnetic shielding property by the base plate can be enhanced.

  Further, according to the present invention, the circuit board can be brought close to the display unit without being restricted by the reinforced insulation distance defined by the safety standard, and the circuit board having the reinforcing bar and the mounting components on the commercial power supply voltage side and the step-down side And the thickness of the thin display device can be reduced.

  In addition, according to the present invention, the second circuit board having the commercial power supply voltage side part and the step-down side part and disposed on the rear side of the reinforcing bar can be brought closer to the display unit. The thickness before and after can be further reduced.

  In addition, according to the present invention, when the base plate is incorporated in an article such as a thin display device in which the columnar body is attached and the base plate is disposed outside the columnar body, the circuit is not hindered by the electronic components. The substrate can be brought close to an article such as a thin display device, and the thickness of the article can be reduced.

  Further, according to the present invention, when the base plate is attached to an article such as a thin display device in which the columnar body is attached and the base plate is disposed outside the columnar body, the base plate and the mounting component are hindered. Therefore, the circuit board can be brought close to an article such as a thin display device, and the thickness of the article can be reduced.

Hereinafter, the present invention will be described in detail with reference to the drawings showing embodiments thereof.
Embodiment 1
FIG. 1 is a rear perspective view showing a configuration of a thin display device according to the present invention, FIG. 2 is a cross-sectional enlarged plan view, and FIG. 3 is a front perspective view of a base plate on which a circuit board is mounted.

  The illustrated thin display device has a panel unit 11 on the front side, a backlight unit 12 that irradiates light to the panel unit 11 on the rear side, a display unit 1 having a substantially rectangular parallelepiped, and the display unit 1 Reinforcing bars 2 and 2 attached at two positions in the middle in the lateral direction on the rear surface 1a, inverter circuit boards 3 and 3 for driving the backlight section 12, and a control circuit board 4 for driving and controlling the panel section 11 The main circuit board 5 and the sub circuit board 6 for processing the image displayed on the panel unit 11, the power circuit board 7 for supplying voltage to the main circuit board 5 and the sub circuit board 6, the main circuit board 5 and the sub circuit board 6 and a base plate 8 on which the power supply circuit board 7 is mounted.

  A plurality of electronic components are mounted on one surface of each of the inverter circuit boards 3 and 3, the control circuit board 4, the main circuit board 5, the sub circuit board 6, and the power supply circuit board 7.

  The panel unit 11 includes a panel 11a having a display surface on the front side and a substantially rectangular parallelepiped shape, and an optical sheet 11b such as a diffusion plate disposed on the rear side of the panel 11a. The backlight unit 12 includes a plurality of lamps that are juxtaposed vertically on the rear side of the optical sheet 11b, irradiate light to the optical sheet 11b side, and a housing 12a that accommodates and supports the lamp. The lamp is a cold cathode tube having electrodes at both ends, and inverter circuit boards 3 and 3 are connected to the electrodes at both ends of each lamp, and the brightness is controlled by a pulse width modulation signal. Yes.

  The housing 12a has a substantially rectangular parallelepiped shape, and includes a frame portion formed by molding a metal plate, and a lid plate formed by closing the rear end of the frame portion and molding the metal plate. 1 is a rear surface 1a.

  Inverter circuit boards 3 and 3 are attached to both sides of the rear surface 1a by screws, and a control circuit board 4 is attached to the lower side of the rear surface 1a by a screw at the lateral center. Reinforcing bars 2 and 2 are attached between the control circuit board 4 and the inverter circuit boards 3 and 3 on the rear surface 1a, and the main circuit board 5, the sub circuit board 6 and the power source are disposed behind the reinforcing bars 2 and 2. A base plate 8 is arranged so that the circuit board 7 faces the rear surface 1a.

  The reinforcing bars 2 and 2 are formed by forming a metal plate into a concave shape in cross section, and are mounted on the rear surface 1a and attached with a plurality of screws to reinforce the housing 12a and thus the display unit 1.

  The base plate 8 opposes the rear surface 1a, and a plate part 81 on which the main circuit board 5, the sub circuit board 6 and the power circuit board 7 are attached to one side, and a circuit board side (one side) from the periphery of the plate part 81. And a plurality of attachment portions 83 extending outward from a plurality of circumferential positions of the frame portion 82, and the attachment portions 83 are screwed to the rear surface 1a. It is configured as follows.

  The plate portion 81 has a rectangular shape, and the main circuit board 5 and the sub circuit board 6 are mounted side by side on one surface in the longitudinal direction, and the power circuit board 7 is mounted on one surface on the other side in the longitudinal direction. .

  The frame portion 82 of the base plate 8 has a substantially rectangular parallelepiped shape, and the frame portion 82 is separated from the reinforcing bars 2 and 2 at four locations, specifically, two locations separated in the lateral direction of the upper piece and laterally in the lower piece. The recesses 84 corresponding to the reinforcing bars 2, 2, in other words, the recessed parts 84 deeper than the thickness of the reinforcing bars 2, 2 are provided at the two locations, and when the mounting portion 83 is attached to the rear surface 1 a, the reinforcing bars 2 , 2 and the bottom surface of the recess 84, a slight gap is formed.

  When the base plate 8 is attached to the rear surface 1a, the main circuit board 5 facing the reinforcing bars 2 and 2 and the portions facing the reinforcing bars 2 and 2 of the power circuit board 7 are mounted with electronic components a whose mounting thickness is reduced. In addition, the electronic component a, b is prevented from coming into contact with the reinforcing bars 2, 2 by mounting the electronic component b whose mounting thickness is increased at a position facing the rear surface 1 a.

  The thin display device configured as described above has two reinforcing bars 2, 2, inverter circuit boards 3, 3, a control circuit board 4, a main circuit board 5, a sub circuit on the rear surface 1 a of the display unit 1. A board 6 and a power circuit board 7 are attached.

  The reinforcing bars 2 and 2 are placed on the rear surface 1 a, and the inverter circuit boards 3 and 3 and the control circuit board 4 are attached at positions not facing the reinforcing bars 2 and 2. The main circuit board 5, the sub circuit board 6 and the power circuit board 7 are mounted on the base plate 8, and the base plate 8 is disposed on the rear side of the reinforcing bars 2, 2, and the base plate 8 and the rear surface 1a A space corresponding to the thickness of the reinforcing bars 2 and 2 is formed between them. Since the base plate 8 is disposed so that the main circuit board 5, the sub circuit board 6 and the power circuit board 7 face the rear surface 1a, the main circuit board 5, the sub circuit board on which the electronic components a and b are mounted. 6 and the power supply circuit board 7 can be accommodated in the space. Therefore, the front-rear thickness on the rear side from the rear surface 1a, more specifically, the distance between the other surface of the base plate 8 and the rear surface 1a is set to the front-rear thickness (electronic The distance between the end of the component and the rear surface can be shortened, and the thickness of the thin display device can be shortened.

  Further, since the base board 8 covers the main circuit board 5, the sub circuit board 6 and the power circuit board 7 mounted on the base board 8, and the base board 8 also serves as an electromagnetic shielding board, the electromagnetic shielding board is used. There is no need to provide a special structure, the structure can be simplified and the weight can be reduced.

Embodiment 2
In this thin display device, the base plate 8 is eliminated, and the main circuit board 5 and the power supply circuit board 7 disposed on the rear side of the reinforcing bars 2 and 2 are arranged so that the mounted electronic components face the rear surface 1a. The mounting thickness of the portion that is attached to 1a and faces the reinforcing bars 2 and 2 is made thinner than the mounting thickness that faces the rear surface 1a.

A plurality of mounting pieces extending to the electronic component side are provided on the peripheral portions of the main circuit board 5 and the power circuit board 7, and the mounting pieces are attached to the rear surface 1 a to attach the electronic components to the reinforcing bars 2, 2. And the thickness of the thin display device is shortened.
Since other configurations and operations are the same as those of the first embodiment shown in FIGS. 1 to 3, the same components are denoted by the same reference numerals, and detailed descriptions and descriptions of the operations and effects are omitted.

Embodiment 3
4A is a schematic rear view showing another configuration of the thin display device, and FIG. 4B is a schematic plan view. This thin display device includes a transformer that constitutes a power supply circuit that steps down a commercial power supply, and a plurality of mountings such as an electrolytic capacitor and a coil that are connected to the transformer and are connected to the transformer on the commercial power supply voltage side (also referred to as primary side or high-voltage side). A component 71 and a plurality of mounting components 72 such as a rectifier diode on the step-down side (also referred to as a secondary side or a low-voltage side) are mounted, and a predetermined power supply voltage is generated by stepping down a commercial power supply 100V using a transformer. The power circuit board 7a is attached to the rear surface 1a so that the non-mounting surface faces the rear surface 1a and the reinforcing bar 2.

  In the power supply circuit board 7a, the mounting component 72 on the step-down side is juxtaposed on one side and the mounting component 71 on the commercial power supply voltage side is juxtaposed on the other side. When the power supply circuit board 7a is attached to the rear surface 1a, The mounting component 71 on the voltage side is disposed on the side away from the reinforcing bar 2, and the mounting component 72 on the step-down side is disposed on the side approaching the reinforcing bar 2.

  A plurality of mounting pieces extending toward the mounting components 71 and 72 are provided on the peripheral edge of the power circuit board 7a, and the mounting pieces are configured to be attached to the rear surface 1a.

In the thin display device configured as described above, the power supply circuit board 7a is disposed behind the reinforcing bar 2, and the mounting components 71 on the commercial power supply voltage side and the step-down side mounted on the power supply circuit board 7a, Reference numeral 72 denotes a rear side of the mounting surface. The power circuit board 7a is a component on the commercial power supply voltage side, and the housing 12a and the reinforcing bar 2 are components on the step-down side. However, since the power supply circuit board 7a is disposed on the side where the mounting component 71 on the commercial power supply voltage side is separated from the reinforcing bar 2, and the mounting component 72 on the step-down side is disposed on the side closer to the reinforcing bar 2, in other words Then, since the step-down mounting component 72 is arranged on the side facing the step-down reinforcing bar 2, the power circuit board 7a is brought closer to the reinforcing bar 2 without being restricted by the reinforced insulation distance defined by the safety standard. The distance between the power circuit board 7a and the reinforcing bar 2 can be set to the front and rear thicknesses behind the rear surface 1a of the conventional thin display device shown in FIG. 10 (between the end of the mounting component and the rear surface 1a). Distance), and the front and rear thickness of the thin display device can be reduced. In this case, since the mounting component 71 on the commercial power supply voltage side faces the rear surface (1a) of the step-down housing 12a, the mounting component 71 on the commercial power supply voltage side and the rear surface 1a are separated by the reinforced insulation distance or more. Since there is a front and rear step between the rear surface 1a and the reinforcing bar 2, the power circuit board 7a can be brought closer to the reinforcing bar 2 by this level difference.
Since other configurations and operations are the same as those of the first embodiment shown in FIGS. 1 to 3, the same components are denoted by the same reference numerals, and detailed descriptions and descriptions of the operations and effects are omitted.

Embodiment 4
FIG. 5 is a schematic plan view showing another configuration of the thin display device. This thin display device includes a base plate 8a as a support member for supporting the power supply circuit board 7a of Embodiment 3 on one surface, and the rear surface so that the other surface of the base plate 8a faces the rear surface 1a and the reinforcing bar 2. It is attached to 1a.

The base plate 8a faces the rear surface 1a and the reinforcing bar 2, and stands on the plate portion 81 on which the power circuit board 7a is attached to one surface, and from the both side edges of the plate portion 81 to the other surface side (the side opposite to the circuit board). It consists of a metal plate having a rising upper portion 85, and is configured such that the rising portion 85 is screwed to the display portion 1 (specifically, the housing 12a) as a support member.
Since other configurations and operations are the same as those of the first to third embodiments shown in FIGS. 1 to 4, the same parts are denoted by the same reference numerals, and detailed descriptions and descriptions of the functions and effects are omitted.

Embodiment 5
6A is a schematic rear view showing another configuration of the thin display device, FIG. 6B is a schematic plan view, and FIG. 7 is a schematic enlarged view of the main part. This thin display device is a combination of the configurations of the second and third embodiments.

  The power supply circuit board 7a disposed behind the reinforcing bar 2 generates a predetermined power supply voltage by stepping down 100V, which is a commercial power supply, using a transformer. The transformer 71a and the transformer 71a, a plurality of mounting parts 71 such as electrolytic capacitors and coils on the commercial power supply voltage side (also referred to as primary side or high voltage side), and a plurality of rectifier diodes on the step-down side (also referred to as secondary side or low voltage side). The mounting component 72 on the step-down side is juxtaposed on one side, and the mounting component 71 on the commercial power supply voltage side is juxtaposed on the other side. The step-down-side mounting component 72 is lower in height from the mounting surface than the mounting component 71 on the commercial power supply voltage side.

  When mounting the power supply circuit board 7a on the rear surface 1a, the mounting component 71 on the commercial power supply voltage side is opposed to the rear surface 1a, and the mounting component 72 on the step-down side is mounted on the rear surface 1a so as to be close to and opposed to the reinforcing bar 2. The mounting thickness at the location facing the reinforcing bar 2 is made thinner than the mounting thickness at the location facing the rear surface 1a.

  In this thin display device, the height from the mounting surface of the step-down mounting component 72 is lower than the height from the mounting surface of the mounting component 71 on the commercial power supply voltage side. Since it is arranged on the side closer to the reinforcing bar 2, the power circuit board 7a can be brought closer to the reinforcing bar 2 without being restricted by the reinforced insulation distance defined by the safety standards. 2 can be further shortened, and the front and rear thickness of the thin display device can be further shortened.

  In the embodiment described above, the two reinforcing bars 2 and 2 are provided. However, a configuration including one reinforcing bar 2 may be used. The main circuit board 5, the sub circuit board 6, and the power supply circuit boards 7 and 7a are provided with the base plates 8 and 8a on which the device is mounted. However, there is one circuit board that is mounted on the base plates 8 and 8a. , Two, or four or more, and the number and type thereof are not specified.

  The thin display device according to the present invention may be a liquid crystal display device such as a liquid crystal television, or a display device such as a plasma display device or an EL display.

It is a rear perspective view showing the configuration of the thin display device according to the present invention. It is a cross-sectional enlarged plan view which shows the structure of the thin display apparatus which concerns on this invention. 1 is a front perspective view of a base plate on which a circuit board of a thin display device according to the present invention is mounted. (a) is a schematic rear view showing another configuration of the thin display device according to the present invention, and (b) is a schematic plan view. It is a schematic plan view which shows the other structure of the thin display apparatus which concerns on this invention. (a) is a schematic rear view showing another configuration of the thin display device according to the present invention, and (b) is a schematic plan view. It is a typical enlarged view of the principal part of the thin display apparatus which concerns on this invention. It is a rear perspective view which shows the structure of the conventional thin display apparatus. It is a cross-sectional enlarged plan view which shows the structure of the conventional thin display apparatus. It is a front side perspective view of the base plate with which the circuit board of the conventional thin display apparatus was mounted | worn. (a) is a schematic rear view showing a configuration of a conventional thin display device, and (b) is a schematic plan view. It is a perspective view of the other circuit board and baseplate part of the conventional thin display apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Display part 1a Rear surface 11 Display part 12a Housing (support member)
2 Reinforcing bars 5 Main circuit board 6 Sub circuit board 7, 7a Power supply circuit board a, b Electronic component 71 Mounting component on the commercial power supply voltage side 72 Mounting component on the step-down side 8, 8a Base plate 81 Plate portion 82 Frame portion 84 Recess 85 Upper part

Claims (8)

  A thin display in which a reinforcing bar for reinforcing the display unit and a circuit board on which a plurality of electronic components are mounted and disposed on the rear side of the reinforcing bar are mounted on the rear surface of the display unit having a display surface on the front side. In the apparatus, the circuit board is disposed so that the electronic component faces the rear surface, and a mounting thickness at a position facing the reinforcing bar is thinner than a mounting thickness at a position facing the rear surface. A thin display device.   On the rear surface of the display unit having a display surface on the front side, a reinforcing bar for reinforcing the display unit, and a base plate mounted with a circuit board on which electronic components are mounted and disposed on the rear side of the reinforcing bar In the attached thin display device, the base plate is arranged so that the circuit board faces the rear surface, and the circuit board has a mounting thickness at a location facing the reinforcing bar, and a mounting thickness at a location facing the rear surface. A thin display device characterized in that it is thinner.   3. The thin display device according to claim 2, wherein the base plate has a plate portion to which the circuit board is attached, and an upright portion that rises from the edge of the plate portion to the circuit board side and is attached to the rear surface.   The base plate has a plate portion to which the circuit board is attached, and a frame portion that rises from the periphery of the plate portion to the circuit board side, and a recess is provided at a location facing the reinforcing bar of the frame portion. The thin display device according to claim 2.   On the rear surface of the display unit having a display surface on the front side, a reinforcing bar for reinforcing the display unit, and a circuit board having a power supply circuit for stepping down the commercial power supply and disposed on the rear side of the reinforcing bar are attached. In the thin display device, the mounting component on the commercial power supply voltage side of the power supply circuit is disposed on the side separated from the reinforcing bar, and the mounting component on the step-down side of the power circuit is disposed on the side approaching the reinforcing bar. A thin display device characterized by that.   6. The circuit board is disposed such that a mounting surface faces the rear surface, and a mounting thickness at a position facing the reinforcing bar is smaller than a mounting thickness at a position facing the rear surface. Thin display device.   A base plate on which a circuit board on which a plurality of electronic components are mounted is mounted on one surface, has a frame portion that rises from a peripheral edge portion to the one surface side, and is located on the side of the columnar body at two opposite positions of the frame portion. A base plate for a circuit board, wherein a recess to be fitted to the part is provided.   In the base plate on which a circuit board formed by mounting a plurality of mounting components is mounted on one surface, a plurality of upright portions that rise from the peripheral edge to the one surface side and are to be attached to a support member that supports the base plate. A base plate for a circuit board, comprising:

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