JP2009014764A - Display device - Google Patents

Abstract

Provided is a display device capable of improving heat dissipation by natural convection around a circuit board.
A display unit having a display surface on the front side, a circuit board attached to the rear side of the display unit, and a cabinet 4 covering the rear side of the display unit, and an intake port below the circuit board. 43, an exhaust port 45 is provided on the upper side, and a second intake port 44 is provided obliquely below the lower part of the circuit board, and air that is sucked into the second intake port 44 is guided to the circuit board side. An air wall 5 is provided to increase the amount of air around the circuit board so that the temperature rise around the circuit board can be suppressed.
[Selection] Figure 2

Description

  The present invention relates to a display device such as a liquid crystal display device, a plasma display device, an SED display, and an EL display.

A thin display device such as a television has a display unit having a display surface for displaying images on the front side, a circuit board attached to the rear side of the display unit, an intake hole on the lower side, and an exhaust hole on the upper side. A cabinet that covers the rear side of the display unit and a fan disposed on the upper side of the cabinet, and air that is sucked into the cabinet from the intake hole by driving of the fan is discharged from the exhaust hole to the outside. It exhausts and is comprised so that the temperature rise in a cabinet may be suppressed (for example, refer patent document 1).
JP 2006-58679 A

  However, in a display device equipped with a fan for heat dissipation, noise is generated when the fan exhausts, and this noise leaks from the exhaust port to the outside. Since thinning is limited, it is preferable to dissipate heat by natural convection without using a fan.

  However, thin liquid crystal televisions and thin plasma televisions have become larger year by year and the front and rear thicknesses have become thinner. In thin liquid crystal televisions, the circuit board that can be attached to the rear surface of the display unit has become large. Although the heat generated by the electronic components mounted on the circuit board will increase, the air flow resistance around the circuit board is reduced because the distance between the circuit board and the rear surface of the cabinet is relatively narrow. Large, the circulation of air to dissipate the heat generated by the circuit board is not sufficient, the air around the circuit board becomes hot, causing thermal runaway of the circuit board and component destruction, and improvement measures have been requested .

  In the present invention, the circuit board mounted on the rear side of the display unit is not the entire surface on the rear side of the display unit, and there are places where the circuit board cannot be mounted, and the circuit board is larger than the display unit. Pay attention to the fact that there is a non-circuit board part on the side of the circuit board, and the air in this non-circuit board part does not reach a higher temperature than the air around the circuit board. An air inlet is provided below, in other words, obliquely below the circuit board, outside air is introduced from the air inlet, and the introduced air is guided to the circuit board side to increase the air volume around the circuit board. The surrounding heat dissipation can be enhanced.

  That is, a main object of the present invention is to provide a display device capable of improving heat dissipation by natural convection around a circuit board.

  A display device according to the present invention includes a display unit having a display surface on the front side, a circuit board attached to the rear side of the display unit, and a cabinet that covers the rear side of the display unit. In the display device in which an intake port is provided on the lower side and an exhaust port is provided on the upper side, a second intake port is provided on the diagonally lower side of the lower part of the circuit board, and the air sucked into the second intake port is An air guide wall that guides air toward the circuit board is provided.

  In the present invention, air can be sucked from the air intake port below the circuit board and the second air intake port obliquely below the circuit board, and the air sucked from the air intake port is passed through the air passage around the circuit board. Can be raised to the exhaust port by natural convection, and further, the air sucked from the second intake port can be guided around the circuit board by the air guide wall, so that the amount of air around the circuit board can be reduced. The temperature can be increased, and the temperature rise around the circuit board can be suppressed.

The display device according to the present invention further includes a substrate support plate that supports the circuit board and is attached to a rear surface of the display unit, and the air guide wall is integrated with the substrate support plate. It is provided.
In this invention, it is possible to attach a plurality of circuit boards to the board support plate to form a board unit, and to eliminate the increase in the number of parts due to the provision of the air guide walls, and to install the air guide walls. This is not necessary, and can be arranged at an appropriate position, and an increase in cost due to the provision of the air guide wall can be suppressed.

In addition, the display device according to the present invention includes a second air guide wall that guides air around the circuit board upward at a position above the air guide wall and on the side of the circuit board. And
In this invention, the air whose amount of air around the circuit board is increased by the wind guide wall can suppress the diffusion from the circuit board to the side, and the upward rising speed can be increased. Heat dissipation can be improved.

The display device according to the present invention is characterized in that the cabinet is provided with a second exhaust port for exhausting air around the circuit board to the outside at a position facing the second air guide wall. .
In this invention, since a part of the air guided by the second air guide wall can be exhausted from the second exhaust port around the circuit board to the outside, the temperature rise around the circuit board is further suppressed. be able to.

The display device according to the present invention includes a display unit having a display surface on the front side, a circuit board attached to the rear side of the display unit, and a cabinet that covers the rear side of the display unit. In the display device in which an intake port is provided below the substrate and an exhaust port is provided on the upper side, a second circuit board is arranged below the circuit board on the rear side of the display unit, and the cabinet A third air inlet opening below the second circuit board, and a third air outlet opening below the air inlet and above the second circuit board, the second circuit A third air guide wall for introducing air on the substrate side to the third exhaust port is provided.
In the present invention, the second circuit board that is likely to generate relatively high heat is partitioned from the other circuit boards by the third air guide wall, and the air sucked around the second circuit board from the third air intake port. Since the air can be guided by natural convection by the third air guide wall and exhausted to the outside from the third discharge port, the heat generated by the second circuit board can be prevented from diffusing to the other circuit board side. it can. Therefore, the temperature rise around other circuit boards can be further suppressed.

The display device according to the present invention includes a substrate support plate that supports the circuit substrate and the second circuit substrate and is attached to a rear surface of the display unit, and is integrated with the substrate support plate. The third air guide wall is provided.
In this invention, the increase in the number of parts due to the provision of the third air guide wall is eliminated, the work for installing the air guide wall is not necessary, and the air guide wall can be provided at an appropriate position without fail. An increase in cost due to this can be suppressed.

In the display device according to the present invention, the third air guide wall is provided by bending a portion of the substrate support plate that overlaps the circuit board.
In this invention, it is possible to provide the third air guide wall without increasing the size of the substrate support plate, and the cost of the substrate support plate by providing the third air guide wall, and consequently the cost of the light source device. Can be reduced.

  According to the present invention, the air sucked from the second suction port obliquely below the lower part of the circuit board is merged with the air sucked from the lower suction port of the circuit board to increase the amount of air around the circuit board. The temperature rise around the circuit board can be suppressed.

Hereinafter, the present invention will be described in detail with reference to the drawings illustrating embodiments thereof.
Embodiment 1
1 is a schematic longitudinal side view showing a configuration of a display device according to the present invention, FIG. 2 is a schematic rear view of a state where a cabinet is removed, and FIG. 3 is a schematic perspective view of a rear side of the state where the cabinet is removed, 4 is a perspective view of the rear side with the cabinet removed, and FIG. 5 is an enlarged perspective view of the main part of the rear side with the cabinet removed.

  The illustrated display device includes 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 a plurality of circuit boards 2. And a substrate module A having a substrate support plate 3 to which the circuit board 2 is attached, a substrate module A attached to the rear surface 1 a of the display unit 1, and a cabinet 4 covering the peripheral edge and the rear side of the display unit 1. Is a thin LCD television.

  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 is juxtaposed vertically on the rear side of the optical sheet 11b, and accommodates and supports a plurality of lamps 12a for irradiating light to the optical sheet 11b side, and a box-shaped chassis 12b. With. The lamp 12a is a cold cathode tube having electrodes at both ends, and inverter circuit boards 13 and 13 are connected to the electrodes at both ends of each lamp 12a, and the brightness is controlled by a pulse width modulation signal. Has been.

  The chassis 12b has a substantially rectangular parallelepiped shape, and includes a frame portion 12c formed by forming a metal plate, and a lid plate portion 12d formed by closing the rear end of the frame portion 12c and forming a metal plate. The plate portion 12d is a rear surface 1a of the display portion 1, and inverter circuit boards 13 and 13 for driving the backlight portion 12 are formed on both sides of the rear surface 1a by male screws such as screws. Installed.

  The substrate module A includes a control circuit board 21 that drives and controls the panel unit 11, a processing circuit board 22 that processes an image displayed on the panel unit 11, and a power circuit board 23 that supplies a voltage to the processing circuit board 22. A terminal circuit board 24 on which a plurality of terminals to which conductive wires such as cables are connected / disconnected to / from external devices are mounted, a control circuit board 21, a processing circuit board 22, a power supply circuit board 23, and a terminal circuit board 24 And a substrate support plate 3 that are mounted side by side.

  A plurality of electronic components such as diodes are mounted on the mounting surfaces of the control circuit board 21, the processing circuit board 22, and the power supply circuit board 23.

  FIG. 6 is a perspective view showing the configuration of the substrate support plate 3. The substrate support plate 3 is opposed to the rear surface 1a, and is composed of a substantially rectangular metal plate to which the control circuit board 21, the processing circuit board 22, the power circuit board 23, and the terminal circuit board 24 are attached on one side. A plurality of locations are attached to the rear surface 1a with male screws such as screws, so that the control circuit board 21 and the power circuit board 23 are juxtaposed vertically along the rear surface 1a. The substrate 6 and the terminal circuit substrate 24 are juxtaposed in the lateral direction along the rear surface 1a.

  A plate-like air guide wall 5 that guides air sucked from a second air inlet, which will be described later, toward the circuit board 2 is integrally formed by bending the lower side of the power supply circuit board 23 of the board support plate 3 by bending. It is provided.

  The air guide wall 5 diagonally sucks air sucked from below by raising a part of the substrate support plate 3 between the power circuit board 23 and the terminal circuit board 24 to the rear (cabinet side) so as to incline up and down. It is comprised so that it can guide upward.

  As shown in FIG. 1, the cabinet 4 includes a frame portion 41 that covers the peripheral portion of the display portion 1, and a lid plate portion 42 that has a deep dish shape and covers the rear side of the display portion 1. The frame portion 41 and the cover plate portion 42 are attached to the peripheral portion of the chassis 12b by a plurality of male screws such as screws.

  In the middle of the cover plate part 42 in the vertical direction, an intake port 43 for sucking external air into the cabinet 4 is provided below the circuit board 2 (power supply circuit board 23), and obliquely below the power supply circuit board 23, In addition, a second air inlet 44 is provided below the air guide wall 5 to suck outside air into the cabinet 4, and above the circuit board 2 (control circuit board 21) above the cover plate part 42. An exhaust port 45 for exhausting the air inside 4 to the outside by natural circulation is provided.

  As shown in FIG. 4, the thin display device configured as described above includes a display unit 1 in which two inverter circuit boards 13 and 13 are attached to a rear surface 1a, and a board module A separately. After being assembled and the substrate module A is attached to the rear surface 1 a of the display unit 1, the cabinet 4 is attached to the display unit 1. The control circuit board 21, processing circuit board 22, power supply circuit board 23, and terminal circuit board 24 of the board module A are juxtaposed on the board support plate 3 along the rear surface 1a. An air passage is secured between them.

Inside the cabinet 4 is an air inlet 43 provided below the circuit board 2 (power circuit board 23) and a second air inlet 44 provided obliquely below the power circuit board 23 into the cabinet 4. Air is sucked in, air sucked from the air inlet 43 rises around the power circuit board 23 and the control circuit board 21, and air sucked from the second air inlet 44 is brought to the power circuit board 23 side by the air guide wall 5. The air is directed obliquely upward, and the air sucked from the air inlet 43 merges around the power supply circuit board 23, and the amount of air increases and rises to the air outlet 45. Therefore, the heat dissipation around the power circuit board 23 and the control circuit board 21 can be enhanced, and the temperature rise in the cabinet 4 can be suppressed.
Also, in the simulation, a wind guide wall is installed as in the embodiment, and the temperature of the circuit board on the oblique upper part of the wind guide wall is reduced by 1.5 degrees by setting the length of the wind guide wall to about 10 cm. It has been verified that

Embodiment 2
FIG. 7 is a schematic rear view showing another configuration of the display device. This display device prevents the air around the control circuit board 21 from diffusing to the side above the air guide wall 5 and to the side position of the circuit board 2 (the control circuit board 21 and the power circuit board 22). A plate-like second air guide wall 6 for guiding the air around the control circuit board 21 upward is provided.

  The second air guide wall 6 is integrally formed by raising a part of the substrate support plate 3 rearward, and is arranged vertically along the side edge of the substrate support plate 3.

  In this display device, since the air around the circuit board 2 increased by the air guide wall 5 can be prevented from diffusing from the circuit board 2 to the side, the air rises to the exhaust port 45. The speed can be increased, and the heat dissipation around the circuit board 2 can be enhanced.

  Moreover, although not shown in figure, the 2nd exhaust port which exhausts the air around the circuit board 2 (control circuit board 21) outside is provided in the position facing the 2nd wind guide wall 6 of the cabinet 4. As shown in FIG. In this configuration, part of the air guided by the second air guide wall 6 can be exhausted from the second exhaust port around the circuit board 2 to the outside, so that the temperature rise around the circuit board 2 is further suppressed. be able to.

Embodiment 3
FIG. 8 is a schematic longitudinal side view showing another configuration of the display device, and FIG. 9 is a schematic rear view of the state in which the cabinet 4 is removed. In this display device, the control circuit board 21 of the board module A is mounted side by side on the lower side of the power supply circuit board 23, the control circuit board 21 is arranged at the lower part of the cabinet 4, and the control circuit board 21 is provided at the lower part of the cabinet 4. A third intake port 46 for sucking outside air into the cabinet 4 is provided on the lower side, and above the control circuit board 21 and below the second air guide wall 5 and the power circuit board 23 around the control circuit board 21. A third exhaust port 47 for exhausting air to the outside of the cabinet 4 is provided, and air is drawn into the cabinet 4 from the third air intake port 46 below the power supply circuit board 23 and above the control circuit board 21 of the board support plate 3. The third air guide wall 7 for guiding the air to the third exhaust port 47 is integrally provided by bending. The control circuit board 21 constitutes a second circuit board.

  The inside of the cabinet 4 is divided into upper and lower parts by the third air guide wall 7, the processing circuit board 22, the power circuit board 23 and the terminal circuit board 24 are arranged on the upper side, and the control circuit board 21 is arranged on the lower side.

  As shown in FIG. 8, the third air guide wall 7 is integrally formed by rearwardly raising a portion of the substrate support plate 3 that overlaps the power circuit board 23, and extends laterally along the lower edge of the substrate support plate 3. It is arranged, and also serves as a partition partitioning the inside of the cabinet 4 up and down.

  In this display device, in the lower part of the cabinet 4, air is sucked into the cabinet 4 from a third air inlet 46 provided below the control circuit board 21, and the sucked air is taken into the control circuit board. 21 rises, is guided by the third air guide wall 7 to the rear third exhaust port 47, and is exhausted from the third exhaust port 47 to the outside. Accordingly, heat dissipation around the control circuit board 21 can be improved, and heat generated by the control circuit board 21 can be prevented from diffusing to the processing circuit board 22, the power supply circuit board 23, and the terminal circuit board 24 side. The temperature rise in the cabinet 4 can be more effectively suppressed by a single layer. In addition, Embodiment 3 is good also as a display apparatus provided with the structure of Embodiment 1 and Embodiment 1. FIG.

  In the embodiment described above, a plurality of circuit boards 2 such as the control circuit board 21, the processing circuit board 22, the power supply circuit board 23, and the terminal circuit board 24 are mounted on the board support plate 3. There may be one circuit board 2.

  Moreover, although it was set as the structure provided with the board | substrate support plate 3 which attached circuit boards 2, such as the control circuit board 21, the processing circuit board 22, the power supply circuit board 23, and the terminal circuit board 24, in addition, the board | substrate support board 3 was eliminated, The circuit board 2 may be attached to the rear surface 1a. In this case, for example, a rising portion that rises from the peripheral edge of the circuit board 2 to the mounting surface is provided, and the rising portion is attached to the rear surface 1a.

  In the embodiment described above, the air guide wall 5, the second air guide wall 6, and the third air guide wall 7 are integrally provided on the substrate support plate 3. However, the air guide wall 5, the second air guide wall, and the like. The wall 6 and the third air guide wall 7 may be provided inside the cabinet 4 by integral molding or the like. Also, the wall 6 and the third air guide wall 7 are provided integrally with the substrate support plate 3 and the cabinet 4, and the lid plate portion 12d of the chassis 12b and the substrate support. It is good also as a structure attached to either the board 3 or the cabinet 4. FIG. Moreover, it is good also as a structure provided in both the board | substrate support plate 3 or the cover board part 12d, and the cabinet 4, for example in a butt | matching form.

  In the embodiment described above, the air guide wall 5 and the second air guide wall 6 are provided on one side of the substrate support plate 3, but the air guide wall 5 and the second air guide wall 6 are also provided on the substrate support plate. 3 may be provided on both sides.

  The 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, an SED display, or an EL display.

It is a typical longitudinal section side view showing composition of a display concerning the present invention. It is a typical rear view of the state which removed the cabinet of the display apparatus which concerns on this invention. It is a typical perspective view of the back side of the state which removed the cabinet of the display apparatus which concerns on this invention. It is a perspective view of the back side of the state which removed the cabinet of the display apparatus which concerns on this invention. It is an expansion perspective view of the principal part of the back side of the state which removed the cabinet of the display apparatus concerning the present invention. It is a perspective view which shows the structure of the board | substrate support plate of the display apparatus which concerns on this invention. It is a typical rear view which shows the other structure of the display apparatus which concerns on this invention. It is a typical longitudinal section side view showing other composition of a display concerning the present invention. It is a typical rear view of the state which removed the cabinet which shows the other structure of the display apparatus which concerns on this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Display part 2 Circuit board 21 Control circuit board (2nd circuit board)
DESCRIPTION OF SYMBOLS 3 Substrate support plate 4 Cabinet 43 Inlet port 44 Second inlet port 45 Exhaust port 46 Third inlet port 47 Third exhaust port 5 Wind guide wall 6 Second wind guide wall 7 Third wind guide wall

Claims (7)

  A display unit having a display surface on the front side; a circuit board attached to the rear side of the display unit; and a cabinet that covers the rear side of the display unit. In the display device provided with exhaust ports respectively, a second intake port is provided obliquely below the lower part of the circuit board, and the air sucked into the second intake port is guided to the circuit board side. A display device comprising a wind guide wall.   The display device according to claim 1, further comprising a substrate support plate that supports the circuit board and is attached to a rear surface of the display unit, and the air guide wall is provided integrally with the substrate support plate. .   3. The display device according to claim 1, further comprising a second air guide wall that guides air around the circuit board upward at a position above the air guide wall and on a side of the circuit board.   The display device according to claim 3, wherein the cabinet is provided with a second exhaust port that exhausts air around the circuit board to the outside at a position facing the second air guide wall.   A display unit having a display surface on the front side; a circuit board attached to the rear side of the display unit; and a cabinet that covers the rear side of the display unit. In the display device provided with exhaust ports respectively, a second circuit board is disposed below the circuit board on the rear side of the display unit, and the cabinet is provided below the second circuit board. There is provided a third air inlet that opens, and a third air outlet that opens below the air inlet and above the second circuit board, and the air on the second circuit board side is supplied to the third air outlet. A display device comprising a third air guide wall that guides air to the outside.   A circuit board supporting plate that supports the circuit board and the second circuit board and that is attached to the rear surface of the display unit is provided, and the third air guide wall is provided integrally with the circuit board supporting plate. The display device according to claim 5.   The display device according to claim 6, wherein the third air guide wall is provided by bending a portion of the substrate support plate that overlaps the circuit board.

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