JP2014059502A - Display device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a display device capable of obtaining sufficient heat radiation effect on a display module as well as an electronic component.SOLUTION: A display device 1 includes a display module 3 and a rear housing 5 covering the rear surface of the display module. The display device further includes a circuit board 40 equipped with an electronic component 44 and a tray member 20 on which the circuit board is mounted to dissipate heat from the electronic component, in a space defined by the display module and the rear housing. The tray member is disposed between the display module and the circuit board. A ventilation path 6 is provided between the tray member and the display module for dissipating heat from the display module and the electronic component using outside air outside the rear housing.

Description

  The present invention relates to a display device, and more particularly, to a display device including a display module and a back housing that covers the back surface of the display module.

In this type of display device, for example, a structure having a thin display module such as a liquid crystal display, a plasma display, or an organic EL display is known. The back surface of the display module is covered with a back housing, and electronic components and a circuit board for driving the display device are arranged in the back housing.
High-density mounting and high output of electronic components can realize a thin display device and a high-performance display device, while increasing the amount of heat generation, causing a decrease in performance and reliability. For this reason, it is necessary to dissipate the electronic components and the like well in the rear housing.

  In display devices, heat is radiated by, for example, forced air cooling by driving a fan or natural air cooling with an opening, but forced air cooling has problems such as fan noise, and there is a sufficient opening area for natural air cooling. If it is not secured, there is a problem that heat cannot be efficiently dissipated. Further, even if a sufficient opening area can be secured, it is not desired that the moisture that has entered the rear housing through this opening is attached to the electronic component or the like. Therefore, for example, Patent Document 1 discloses a structure of a display device that does not allow infiltrated moisture to adhere to an electronic component or the like.

JP 2009-231511 A

  By the way, the display device described in Patent Document 1 has a square cylindrical radiator, the inner peripheral surface of the radiator forms an air passage, and electronic components and the like are installed on the outer peripheral surface of the radiator. . However, this electronic component is disposed between the display module and the heatsink, and the heat dissipation of the display module is performed via a heat conductive component that contacts the display module and the heatsink across the electronic component. . Therefore, in the structure of Patent Document 1, there is still a problem with respect to obtaining a sufficient heat dissipation effect for the display module in addition to the electronic component.

  Moreover, according to the cylindrical heatsink, a high chimney effect can be obtained, but installing an electronic component or a circuit board on another outer peripheral surface opposite to the display module of the outer peripheral surface of the radiator is This hinders thinning of the display device. For this reason, the structure of Patent Document 1 also has a problem that the degree of freedom of installation of electronic components and the like is small.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a display device capable of obtaining a sufficient heat dissipation effect not only for electronic components but also for a display module.

  In order to solve the above-described problem, a first technical means of the present invention is a display device including a display module and a rear housing that covers a back surface of the display module, and is divided by the display module and the rear housing. A circuit board on which electronic components are mounted, and a tray member that dissipates the electronic components by installing the circuit board, and the tray member is disposed between the display module and the circuit board. The display is characterized in that a ventilation passage is provided between the tray member and the display module to dissipate heat from the display module and the electronic component by outside air outside the rear housing. Device.

  According to a second technical means, in the first technical means, the rear housing opens below the ventilation passage, and a lower surface intake port for taking the outside air into the ventilation passage, and the ventilation passage. And an upper surface exhaust port for discharging the air in the ventilation passage to the outside of the rear housing.

  According to a third technical means, in the first or second technical means, the rear housing extends from an upper part of the rear housing into a space defined by the display module and the rear housing, and the tray. A partition wall connected to the member is provided, and the partition wall partitions the ventilation passage and the arrangement space of the circuit board.

  According to a fourth technical means, in the third technical means, the rear housing has a plurality of vent holes that open on the opposite side of the display module with respect to the tray member, A rear intake port for taking outside air into the arrangement space of the circuit board; and a rear exhaust port that is provided above the rear intake port and exhausts the air in the arrangement space of the circuit board to the outside of the rear housing. It is characterized by this.

  A fifth technical means according to any one of the first to fourth technical means is characterized in that the display module and the tray member have heat radiating fins protruding in the ventilation passage. is there.

  A sixth technical means is the technical means according to any one of the first to fifth aspects, wherein the cable has a predetermined wiring pattern and extends into the ventilation passage, and a cover that covers the cable in the ventilation passage. And a member.

  According to the present invention, the display module, the tray member, and the circuit board are arranged in this order, and a ventilation passage is provided between the tray member and the display module. Dissipate heat. Therefore, a sufficient heat dissipation effect can be obtained not only for the electronic components but also for the display module.

It is the perspective view which looked at the display apparatus by this invention from the back side. It is a rear view of the display module by this invention. It is arrow sectional drawing of the III-III line | wire of FIG. It is arrow sectional drawing of the IV-IV line | wire of FIG. It is the elements on larger scale of FIG.

The display device of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a display device according to the present invention as viewed from the back side. The display device 1 is a liquid crystal television with a stand, for example, and is configured to be installed on a floor of a room, a television stand, or the like.
Although not shown, the display module 3 includes a rectangular LCD (Liquid Crystal Display) panel having a liquid crystal layer, a glass substrate, etc., a protective glass, a polarizing plate, a diffusion plate, a backlight, and the like. . The backlight is configured, for example, as a direct type in which LEDs are arranged in a plane.

The front peripheral edge and outer peripheral surface of the display module 3 are pressed by a frame-shaped front cabinet 2, and the rear surface of the display module 3 is covered by a box-shaped rear cabinet 5. The front of the rear cabinet 5 is open, and the open peripheral edge portion is configured to be connectable to the front cabinet 2. Note that the rear cabinet 5 corresponds to the rear case of the present invention.
Further, the rear cabinet 5 has a lower surface 10, an upper surface 11, a right side surface 12 and a left side surface 13 along the four sides of the display module 3. The lower surface 10 extends in the horizontal direction in the vicinity of the stand, the upper surface 11 extends in the horizontal direction at a position farthest from the stand, and the right side surface 12 extends in the vertical direction on the right side when viewed from the front of the display device 1. 13 extend in the vertical direction on the left side as seen from the front.

The lower surface 10, the upper surface 11, the right side surface 12, and the left side surface 13 are formed with steps, for example, and approach the center as they move away from the display module 3, and the opposite side of the display module 3 is a flat back surface 14. Closed.
On the other hand, electronic components and circuit boards for driving the display device 1 are accommodated in the rear cabinet 5.

FIG. 2 is a rear view of the display module according to the present invention, and shows a state where the rear cabinet 5 is removed from the display device 1 of FIG.
On the back side of the display module 3, for example, a main board 30, a power supply board 40, a panel control board 50 and the like are provided, and these are covered and protected by the rear cabinet 5. A control circuit that controls various operations of the display device 1 is formed on the main substrate 30. A power supply circuit for controlling the power supplied to the display device 1 is formed on the power supply board 40, and an LCD control circuit for controlling the LCD panel is formed on the panel control board 50. The main board 30, the power supply board 40, and the panel control board 50 correspond to the circuit board of the present invention.

Here, the main board 30, the power board 40 and the panel control board 50 are installed on the tray member 20. Specifically, the tray member 20 is formed in, for example, a rectangular thin plate shape, and the surface of the tray member 20 is opposed to the display module 3 with a predetermined gap, and the tray member 20 It is fixed to the display module 3 with pins 23 provided around.
The main board 30, the power board 40 and the panel control board 50 are installed on the back surface 22 of the tray member 20.

For example, the main board 30, the power supply board 40, and the panel control board 50 are all formed in a square shape, for example, smaller than the tray member 20, and the main board 30 is on the right side of FIG. 1 with respect to the center of the tray member 20. It is arranged near the surface 12. The front surface of the main substrate 30 faces the tray member 20 and is fixed to the tray member 20 using pins 33 inserted from the back surface 32 of the main substrate 30.
The power supply substrate 40 is disposed closer to the left side surface 13 in FIG. 1 with respect to the center of the tray member 20, and the surface of the power supply substrate 40 faces the tray member 20. The power supply substrate 40 is fixed to the tray member 20 using pins 43 inserted from the back surface 42 thereof.

  The panel control board 50 is disposed near the lower surface 10 in FIG. 1 with respect to the center of the tray member 20. The front surface of the panel control board 50 faces the tray member 20, and the panel control board 50 is fixed to the tray member 20 using pins 53 inserted from the back surface 52 thereof. A connector 54 connected to the flexible cable 55 is provided at the lower portion of the back surface 52. This flexible cable 55 corresponds to the cable of the present invention.

3 is a cross-sectional view taken along line III-III in FIG. 1, and FIG. 4 is a cross-sectional view taken along line IV-IV in FIG.
As shown in FIG. 3, the electronic component 34 is mounted on the surface 31 of the main board 30 described above, and the electronic component 34 and the back surface 22 of the tray member 20 are in contact with each other via a heat radiating plate 35. A plurality of electronic components 44 are mounted on the front surface 41 of the power supply substrate 40, and the electronic components 44 and the back surface 22 of the tray member 20 are in contact with each other via a heat radiating plate 45 and a heat radiating sheet 47. Depending on the configuration of the electronic component 44, the reinforced insulating sheet 46 may be sandwiched between the heat radiating plate 45 and the heat radiating sheet 47.

Note that an electronic component such as a timing controller of an LCD control circuit is also mounted on the front surface 51 of the panel control board 50 shown in FIG. 4 and is brought into contact with the back surface 22 of the tray member 20 via a heat sink or the like. Good. As described above, the tray member 20 can dissipate the electronic component 34 and the like by contacting the heat sink 35 and the like by installing the main board 30, the power supply board 40 and the panel control board 50 on the back surface 22.
Furthermore, the tray member 20 can dissipate heat from the display module 3 by being disposed between the display module 3 and the main substrate 30 or the like.

  Specifically, as shown in FIGS. 3 and 4, a ventilation passage 6 is provided between the surface 21 of the tray member 20 and the back surface of the display module 3. The right side and the left side of the ventilation passage 6 are partitioned by a right side surface 12 and a left side surface 13. Further, as shown in FIG. 4, a lower surface air inlet 10 a is formed through the lower surface 10 of the rear cabinet 5 below the ventilation passage 6, and the lower surface air inlet 10 a is, for example, left and right of the display device 1. It is formed horizontally long along the direction. On the other hand, a horizontally long upper surface exhaust port 11 a as shown in FIG. 1 is formed above the ventilation passage 6 so as to penetrate the upper surface 11 of the rear cabinet 5.

  The ventilation passage 6 is formed such that the width between the front surface 21 of the tray member 20 and the rear surface of the display module 3 is, for example, 10 mm or more. When air having a temperature higher than the outside air exists in the ventilation passage 6, as shown by an upward arrow in FIG. 4, the high temperature air rises toward the upper surface exhaust port 11a, and the outside air flows from the lower surface intake port 10a. It is taken into the ventilation passage 6. Thus, the high-temperature air in the ventilation passage 6 is quickly discharged from the upper surface exhaust port 11a to the outside of the rear cabinet 5 by the chimney effect.

Further, the electronic component 34 and the like are disposed on the opposite side of the display module 3 with the tray member 20 interposed therebetween, and are not disposed in the ventilation passage 6. Therefore, even if moisture or the like enters the ventilation passage 6 from the upper surface exhaust port 11a, it is difficult to adhere to the electronic component 34 or the like.
Further, if the plate-like tray member 20 as described above is employed, the display device 1 can be made thinner even if an electronic component or a circuit board is installed on the front surface 21 in addition to the back surface 22. This increases the degree of freedom in installing electronic components.

  If it is desired to further increase the heat radiation efficiency, heat radiation fins may be provided in the ventilation passage 6. Specifically, as shown in FIG. 3, the surface 21 of the tray member 20 is provided with a plurality of radiating fins 24 extending in the vertical direction of the display device 1, for example. In addition, on the back surface of the display module 3, for example, a plurality of heat radiation fins 4 extending in the vertical direction are provided between adjacent heat radiation fins 24, and the heat radiation fins 24 and the heat radiation fins 4 are alternately arranged. Has been.

By the way, the rear cabinet 5 is formed with a ventilation passage 6 located on the front surface 21 side of the tray member 20 and a circuit board arrangement space 7 located on the rear surface 22 side of the tray member 20. The passage 6 and the circuit board placement space 7 are partitioned by a partition wall 16.
Specifically, as shown in FIGS. 3 and 4, the partition wall 16 has inner surfaces of the upper surface 11, the right side surface 12, and the left side surface 13 extending toward the tray member 20, and is connected to the periphery of the tray member 20, for example. doing. For this reason, even if moisture or the like enters the ventilation passage 6 from the upper surface exhaust port 11a, the partition wall 16 can more reliably prevent the partition board 16 from entering the arrangement space 7 of the circuit board.

  On the other hand, outside air is also introduced into the circuit board placement space 7. On the back surface 14 of the rear cabinet 5, a plurality of vent holes that are opened on the opposite side of the display module 3 with respect to the tray member 20 are formed. As shown in FIGS. For example, a horizontally long first back surface intake port 14 a is formed through the back surface 14, and a horizontally long second back surface intake port 14 b is also formed thereabove through the back surface 14. Since the outside air from the first back surface intake port 14a can be used for heat dissipation of the ventilation passage 6 described above, no partition wall is provided from the inside of the lower surface 10 toward the periphery of the tray member 20.

  Further, for example, a horizontally long rear exhaust port 14 c is formed in the back surface 14 near the upper surface exhaust port 11 a so as to penetrate the back surface 14. Therefore, if air having a temperature higher than the outside air exists in the circuit board arrangement space 7, the high temperature air rises toward the rear exhaust port 14c as shown by an upward arrow in FIG. The air is taken into the circuit board placement space 7 from the rear of the device 1 through the first and second rear air inlets 14a and 14b. The high-temperature air in the circuit board placement space 7 is discharged toward the rear of the display device 1 from the rear exhaust port 14c.

FIG. 5 is a partially enlarged view of FIG. A flexible cable 55 having a predetermined wiring pattern connects, for example, a driver board in the display module 3 and a connector 54 provided on the back surface 52 of the panel control board 50 and extends into the ventilation passage 6. The driver substrate is connected to a source driver and a gate driver that drive the LCD panel.
As described above, the upper surface exhaust port 11a through which moisture or the like can enter is provided immediately above the ventilation passage 6. For this reason, the cover member 60 covers the upper side of the flexible cable 55 in the ventilation passage 6.

The cover member 60 is formed, for example, in a U-shaped cross section, and is installed in contact with, for example, the surface 51 of the panel control board 50 and the display module 3 in a posture in which the opening faces downward. The flexible cable 55 is protected against moisture that has entered from the mouth 11a.
In the above embodiment, a direct type backlight is described as an example, but an edge light type may be used. The present invention is also applicable when an inverter board or the like that adjusts the frequency of the voltage applied to the light source is installed on the tray member as a circuit board.

DESCRIPTION OF SYMBOLS 1 ... Display apparatus, 2 ... Front cabinet, 3 ... Display module, 4 ... Radiation fin, 5 ... Rear cabinet, 6 ... Ventilation passage, 7 ... Circuit board arrangement space, 10 ... Lower surface, 10a ... Lower surface inlet port, 11 ... upper surface, 11a ... upper surface exhaust port, 12 ... right side surface, 13 ... left side surface, 14 ... back surface, 14a ... first rear intake port, 14b ... second rear intake port, 14c ... rear exhaust port, 16 ... partition wall 20 ... Tray member, 21 ... Front surface, 22 ... Back surface, 23 ... Pin, 24 ... Heat radiation fin, 30 ... Main board, 31 ... Front surface, 32 ... Back surface, 33 ... Pin, 34 ... Electronic component, 35 ... Heat sink, DESCRIPTION OF SYMBOLS 40 ... Power supply board, 41 ... Front surface, 42 ... Back surface, 43 ... Pin, 44 ... Electronic component, 45 ... Heat sink, 46 ... Reinforcement insulating sheet, 47 ... Heat dissipation sheet, 50 ... Panel control board, 51 ... Front surface, 52 ... Back side, 53 ... pin, 54 Connector, 55 ... Flexible cable, 60 ... cover member.

Claims (6)

In a display device comprising a display module and a back housing that covers the back of the display module,
In the space defined by the display module and the back housing, a circuit board on which electronic components are mounted, and a tray member that dissipates the electronic components by installing the circuit board,
The tray member is disposed between the display module and the circuit board, and heat from the display module and the electronic component is radiated between the tray member and the display module by outside air outside the rear housing. A display device characterized in that a ventilation passage is provided. The display device according to claim 1,
The rear housing opens below the ventilation passage, opens on the lower surface intake port for taking the outside air into the ventilation passage, and opens above the ventilation passage, and air in the ventilation passage. And a top surface exhaust port for discharging the air to the outside of the rear housing. The display device according to claim 1 or 2,
The rear housing extends from the upper portion of the rear housing into a space defined by the display module and the rear housing, and has a partition wall connected to the tray member. A display device that partitions a passage and an arrangement space of the circuit board. The display device according to claim 3,
The back housing has a plurality of vents that open on the opposite side of the display module with respect to the tray member, and the vents take a back intake port for taking the outside air into the arrangement space of the circuit board. And a rear exhaust port that is provided above the rear intake port and exhausts the air in the arrangement space of the circuit board to the outside of the rear casing. The display device according to any one of claims 1 to 4,
The display device according to claim 1, wherein the display module and the tray member have heat radiating fins protruding in the ventilation passage. The display device according to any one of claims 1 to 5,
A display device, further comprising: a cable having a predetermined wiring pattern and extending into the ventilation passage; and a cover member covering the cable in the ventilation passage.

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