WO2019163555A1

WO2019163555A1 - Image display device

Info

Publication number: WO2019163555A1
Application number: PCT/JP2019/004558
Authority: WO
Inventors: 計行高橋; 雅仁風間
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2018-02-26
Filing date: 2019-02-08
Publication date: 2019-08-29

Abstract

An image display device comprises: a display panel module (180); a housing (110) having a frame part and a rear part, the housing including a first opening and a second opening that allow an internal space surrounded by the frame part, the rear part, and the back of the display panel module (180) to communicate with the outside; a driver IC (124) for driving the display panel module (180); a fan (116) that allows air entering the internal space through the first opening to exit through the second opening; and a heat dissipation plate (130) thermally connected to the driver IC (124). The heat dissipation plate (130) is located between the first opening and the second opening in the internal space such that the heat dissipation plate (130) is arranged to form, in a first space of the internal space which contacts a first surface that is one surface of the heat dissipation plate (130), a first flow passage starting from the first opening and extending along the first surface and the surface of the frame part that faces the first space, and to form, in a space near a second surface that is the other surface of the heat dissipation plate (130), a second flow passage located downstream of the first flow passage and reaching the second opening.

Description

Image display device

The present disclosure relates to an image display device.

Patent Document 1 discloses an image display device including a display panel that is driven by a driver IC (integrated circuit) such as a liquid crystal panel or an organic EL (electroluminescence) panel to display an image.

Japanese Patent No. 6000588

This disclosure provides an image display device with improved heat dissipation.

An image display device according to an aspect includes a display panel module that displays an image on a front surface, a frame portion along a peripheral edge of the display panel module, and a back surface portion that faces a back surface of the display panel module. A housing having a first opening and a second opening for communicating the back surface of the display panel module, and the internal space surrounded by the back surface portion and the outside, and the housing, which is disposed in the internal space and drives the display panel module A driver IC; a fan for discharging air flowing into the internal space from the first opening through the second opening; and a heat radiating plate thermally connected to the driver IC in the internal space. Is located between the first opening and the second opening in the internal space, and in the first space, which is one surface of the heat sink, in the internal space. A first flow path is formed in the first space that starts from the first opening and extends along the surface facing the first space of the first surface and the frame portion, and is a second surface that is the other surface of the heat sink It arrange | positions so that the 2nd flow path which reaches the said 2nd opening downstream from said 1st flow path may be formed in the space located in the surface side.

The image display device according to the present disclosure has improved heat dissipation.

FIG. 1 is an external perspective view of a liquid crystal television including an image display device according to an embodiment. FIG. 2 is an external perspective view of a liquid crystal television including the image display device according to the embodiment. FIG. 3 is an exploded perspective view of the image display apparatus according to the embodiment. FIG. 4 is an external perspective view of the display panel and its peripheral components in the embodiment. FIG. 5 is a cross-sectional view of the liquid crystal television and a partially enlarged cross-sectional view of the image display device. FIG. 6 is an external perspective view of an example of a duct plate provided in the image display device. FIG. 7 is an external perspective view of a liquid crystal television including an image display device according to a modification of the embodiment. FIG. 8 is an external perspective view of a liquid crystal television including an image display device according to a modification of the embodiment. FIG. 9 is a cross-sectional view of a liquid crystal television and a partially enlarged cross-sectional view of an image display device according to a modification of the embodiment.

The inventors of the present application have found that the following problems occur with respect to a conventional image display device.

There are parts that can serve as heat sources such as a power supply circuit and a control circuit including various elements such as an IC and a capacitor on a substrate built in the image display device. In the case of an image display device configured using a liquid crystal panel, a light source such as an LED (Light-Emitting Diode) used as a backlight is also a heat source. A plurality of such heat sources are present inside the image display device. The heat inside the image display device shortens the lifetime of the element, causes display failure such as luminance unevenness, or causes malfunction due to thermal runaway of various ICs. Therefore, in order to avoid the occurrence of these problems, heat radiation from the inside is taken into consideration in the design of the image display device. For example, there is an image display apparatus further including a fan for actively replacing air heated inside, in addition to a ventilation hole opened on a side surface or a back surface of a housing.

It should be noted that air that has absorbed the heat of the components inside the casing will increase buoyancy. Therefore, in the image display device, the upper end side opposite to the gravity, for example, the upper part of the bezel along the peripheral edge of the display panel is easily heated by the buoyant air. Furthermore, many image display devices have a driver IC disposed near the periphery of the display panel. Combined with the heat from the driver IC, the upper part of the bezel tends to be hotter than the other parts of the image display device. Further, in an image display device with a narrow frame, the distance from the driver IC to the bezel tends to be shortened, so that the bezel and the vicinity thereof have a higher temperature. Therefore, in addition to incurring the above-mentioned problems, people who touch this part from the outside of the casing may feel uncomfortable due to unexpected heat.

The present disclosure has been made based on such knowledge, and obtained an idea about the structure of an image display device for obtaining better heat dissipation performance.

Hereinafter, embodiments will be described with reference to the drawings as appropriate. However, the inventor of the present application provides the accompanying drawings and the following description in order for those skilled in the art to fully understand the present disclosure, and is not intended to limit the claimed subject matter. Absent. The embodiment shown in the present disclosure shows a specific example of the present invention. Therefore, the numerical values, components, arrangement of components, connection forms, and the like shown in the following embodiments are merely examples and do not limit the present invention.

In addition, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims can be arbitrarily added.

Each figure is a schematic diagram and is not necessarily shown strictly.

Also, more detailed explanation than necessary may be omitted. For example, detailed descriptions of already well-known matters and repeated descriptions for substantially the same configuration may be omitted. This is to avoid hindering easy understanding by those skilled in the art due to the redundant description.

In the following embodiments, for convenience of explanation, the left-right direction is made to coincide with the X-axis direction, the up-down direction is the Y-axis direction, that is, the gravity direction is the negative direction of the Y-axis, and the direction opposite to gravity is Y. The forward and backward directions are made to coincide with the positive direction of the axis and the Z-axis direction is made to coincide, but the correspondence relationship between these directions does not limit the posture at the time of manufacturing or using the image display device according to the present disclosure. .

Hereinafter, embodiments will be described with reference to FIGS.

(Embodiment)
[1. overall structure]
FIG. 1 is an external perspective view of a liquid crystal television 10 including an image display device 100 according to an embodiment. FIG. 2 is an external perspective view of the liquid crystal television 10 viewed from another viewpoint. FIG. 3 is an exploded perspective view of the image display device 100.

As shown in FIGS. 1 and 2, the liquid crystal television 10 includes an image display device 100 and a stand 200 that supports the image display device 100.

The image display device 100 is a device that displays a still image and a moving image (hereinafter collectively referred to as an image), and includes a display panel 120 and a casing 110 that covers a portion other than the front surface of the display panel 120.

The display panel 120 is a liquid crystal panel including a liquid crystal cell in which liquid crystal is sealed, for example. The display panel 120, the duct plate 130, the panel holder 140, the optical sheet unit 150, the LED substrate 160, and the backlight chassis 170 are assembled to constitute the display panel module 180. The display panel module 180 is controlled based on the video signal input to the image display device 100 and displays an image on the front surface thereof.

The housing 110 includes a bezel 112 along the periphery of the display panel module 180 and a back cover 114 along the back of the display panel module 180.

The bezel 112 is a member that protects the outer peripheral portion of the display panel module 180 and forms part of the appearance of the image display apparatus 100. As the material of the bezel 112, a resin such as polycarbonate or polystyrene, or a metal such as an aluminum alloy is used. The bezel 112 is an example of a frame portion of the housing in the present embodiment.

The back cover 114 is a member that covers and protects various components arranged inside the image display device 100 from the back, and forms a part of the appearance of the image display device 100. As a material for the back cover 114, a metal such as iron or aluminum, or a resin such as polycarbonate or polystyrene is used. The back cover 114 is an example of the back part of the housing in the present embodiment.

The housing 110 has a plurality of openings H10, H20, and H30. The openings H10 to H30 communicate the space surrounded by the bezel 112, the back surface of the display panel module 180, and the inner surface of the back cover 114 facing the back surface (hereinafter referred to as an internal space), and the outside of the housing 110. It is a through hole to be made.

The openings H10 to H30 are schematically shown by simple rectangular frames in FIGS. 2 and 3, respectively, but their shape, size, position, number, and range occupied by the casing 110 are shown in the drawing. It is not limited.

For example, the opening H10 may be a plurality of slits arranged in the left and right (X-axis direction) near the upper end of the image display device 100. The opening H10 is not a hole formed in the back cover 114 as shown in FIGS. 2 and 3, but is an upper portion of the bezel 112 shown by a broken line pattern in FIG. 3 (hereinafter referred to as an upper bezel 112A). It may be a gap provided between the rear cover 114 and the rear cover 114. Such an opening H10 is an example of the first opening in the present embodiment.

Further, the opening H20 is provided in the back cover 114, is located below the opening H10, and the shape may be a rectangle or a circle as illustrated. This shape and size are exemplified in relation to an exhaust fan described later. Such an opening H20 is an example of the second opening in the present embodiment.

The opening H30 may be located below the opening H20, and the shape may be the same as the opening H10. Further, the opening H30 is not a hole opened in the back cover 114 as shown in FIGS. 2 and 3, but a lower portion of the bezel 112 (hereinafter referred to as a lower bezel 112B) shown by a one-dot chain line pattern in FIG. And a gap provided between the back cover 114 and the back cover 114. Such an opening H30 is an example of the third opening in the present embodiment.

As shown in FIG. 3, the image display device 100 further includes a duct plate 130, a panel holder 140, an optical sheet unit 150, an LED board 160, a backlight chassis 170, a signal circuit board 182 and a power circuit board. 184, a control circuit board 190, and a fan 116.

The duct plate 130 is thermally connected to a driver IC that drives the display panel 120. For the material of the duct plate 130, a material having good heat transfer characteristics such as aluminum, iron, copper, or an alloy containing these is used. Duct plate 130 in the present embodiment is a member obtained by bending a plate made of such a material, and is an example of a heat radiating plate in the present embodiment. In the internal space, the driver IC is located above the display panel 120 and is connected to the display panel 120 via a flexible wiring board. Here, an example of connection between the display panel 120 and the driver IC will be described. FIG. 4 is an external perspective view and a partially enlarged view of the peripheral components including the display panel 120 and the driver IC in the embodiment.

Referring to FIG. 4, the driver IC 124 is disposed below the flexible wiring board 126 connected near the upper end of the display panel 120. The relay board 122 is connected to the end of the flexible wiring board 126 opposite to the end to which the display panel 120 is connected. In the present embodiment, a case where the display panel 120 and the driver IC 124 are connected in such a form is used as an example, and will be described later with reference to an assembly state diagram of the image display device 100. It is not limited to examples. Other examples of connection modes will be described later.

The panel holder 140 supports the display panel 120 and sandwiches the optical sheet unit 150 and the LED substrate 160 with the backlight chassis 170.

The optical sheet unit 150 is configured by stacking a plurality of types of sheets having different optical characteristics. The sheets having different optical characteristics are, for example, a vertical prism sheet, a horizontal prism sheet, and a diffusion sheet. As a result, the light distribution of the LEDs, which are a plurality of point light sources spaced apart from each other, can be changed to irradiate the entire display panel 120 with light with a substantially uniform light distribution.

The LED substrate 160 is a substrate on which a plurality of LEDs that are the light sources of the backlight of the image display apparatus 100 are arranged apart from each other.

The backlight chassis 170 sandwiches the optical sheet unit 150 and the LED substrate 160 with the panel holder 140 described above.

The signal circuit board 182 outputs a video signal from an antenna terminal (not shown) or an external input terminal (not shown) further provided in the image display device 100 to the control circuit board 190.

The control circuit board 190 transfers the video signal to the driver IC 124 at an appropriate timing so that an image based on the video signal input from the signal circuit board 182 is displayed on the display panel 120. The driver IC that has received this video signal drives the display panel 120 to display an image by applying an appropriate voltage to each pixel of the display panel 120.

The power supply circuit board 184 appropriately adjusts the electric power adjusted by rectifying the electric power input to the image display device 100 from a power source such as a commercial power source and converting the voltage to each component of the image display device 100 that requires electric power. Supply.

The fan 116 is, for example, an axial fan that discharges air in the internal space to the outside of the image display apparatus 100. The present embodiment will be described using an example in which the fan 116 disposed at a position facing the opening H20 in the internal space discharges air flowing into the internal space from the opening H10 or the opening H30 through the opening H20. The configuration of the fan included in the image display device 100 is not limited to this example. Other configuration examples of the fan included in the image display device 100 will be described later.

[2. Heat dissipation mechanism]
Next, details of a mechanism that contributes to heat dissipation in the image display apparatus 100 configured as described above will be described using an example.

FIG. 5 is a sectional view of the liquid crystal television 10 and a partial sectional view of the image display device 100 obtained by enlarging a part thereof. The cut surface for this cross-sectional view and partial cross-sectional view is a plane including the VV line shown in FIG. 1 and parallel to the YZ plane. Note that this cut surface intersects the through hole of the duct plate 130. FIG. 6 is an external perspective view of the entire duct plate 130. The six through holes H40 of the duct plate 130 shown in FIG. 6 are examples of through holes that penetrate between the upper surface and the lower surface of the duct plate 130. A VV line in FIG. 6 indicates a cutting position of the duct plate 130 by the cut surface.

As shown in FIG. 5, the duct plate 130 is disposed so as to partition the internal space into two upper and lower spaces between the opening H10 and the opening H20. In the following, for convenience of explanation, a space in contact with the upper surface (hereinafter referred to as the first surface) of the duct plate 130 among these two spaces is positioned on the first space, the lower surface (hereinafter referred to as the second surface) side of the duct plate 130. The space is referred to as the second space.

The first space is a space sandwiched between the first surface of the duct plate 130 and the lower surface of the upper bezel 112A that is a part of the inner surface of the housing 110, and communicates directly with the opening H10. The second space located on the second surface side of the duct plate 130 communicates directly with the opening H20 and the opening H30.

Furthermore, since the duct plate 130 is in contact with the upper surface of the flexible wiring board 126, it is thermally connected to the driver IC 124 disposed on the lower surface of the flexible wiring board 126 via the flexible wiring board 126. The heat generated in the driver IC 124 and transmitted to the duct plate 130 via the flexible wiring board 126 increases the temperature of the entire duct plate 130. This heat is also transmitted to the upper bezel 112 </ b> A through the air convection in the first space or by heat radiation from the duct plate 130, thereby raising the temperature of the bezel 112. Further, the duct plate 130 and the upper bezel 112 </ b> A have not only heat from the driver IC 124, but also heat generated by various heat sources such as various circuit boards and LEDs in the image display device 100. It is transmitted through various heat paths.

Here, when the fan 116 is operated and the air in the internal space is discharged from the opening H20, negative pressure is generated in the internal space, so that the air flows into the internal space from the opening H10 and the opening H30.

The air flowing from the opening H10 into the internal space where the duct plate 130 is arranged as described above first enters the first space, and reaches the first surface and the lower surface of the upper bezel 112A, that is, the surface facing the first space. Flows along the flow path. This air flow path starting from the opening H10 is referred to as a first flow path. The first flow path is indicated by a white block arrow in the partially enlarged view in FIG.

The air flowing through the first flow path proceeds while absorbing heat from the duct plate 130 and the upper bezel 112A having higher temperatures. That is, the duct plate 130 and the upper bezel 112A heated by the heat generated by the heat source in the image display device 100 are cooled by the cooler air that is taken from outside and flows through the first flow path.

The air whose temperature has increased while flowing through the first flow path then enters the second space through the through hole H40. In the second space, the air travels toward the operating fan 116 and is exhausted from the opening H20 to the outside of the casing 110 by the fan 116. The air flow path downstream of the first flow path and reaching the opening H20 in the second space is referred to as a second flow path. The second flow path is indicated by a black block arrow in the partially enlarged view in FIG.

In the second space, air may absorb heat from a higher temperature component along the second flow path to cool this component. In the example of FIG. 5, the air flowing through the second flow path can absorb the heat of the control circuit board 190. Thus, the target component to be cooled by the air flowing through the second flow path is not limited to the control circuit board 190. If the part is located along the second flow path in the positional relationship between the opening H20 and the fan 116 and each part, the part is cooled by the air flowing through the second flow path. In other words, the image display device 100 may be designed such that components that need or are desired to be cooled are arranged along the second flow path.

Also, it is not only the air flowing through the second flow path that cools the components in the second space. The air flowing along the path from the opening H30 to the opening H20 also cools the parts along this path in the second space. The air whose temperature has increased by absorbing heat while flowing through this path is also discharged from the opening H20 by the fan 116.

[3. Modified example]
As described above, the embodiments have been described as examples of the technology disclosed in the present application. However, the technology disclosed in the present application is not limited to the above-described embodiment, and includes modifications in which components are appropriately changed, replaced, added, omitted, and the like. Examples of such modifications will be illustrated below.

(1) The heat sink provided in the image display device according to the technology disclosed in the present application may not have a bent portion as seen in the duct plate 130 shown in FIG. 3 or FIG. The heat radiating plate may have a flat shape or may be curved.

Note that heat can be radiated more efficiently by increasing the contact surface between the air flowing through the first flow path and the heat radiating plate. A heat sink having a shape including a bend or a shape including a curve shown in the drawings used for the description of the embodiment is in contact with air on a wider surface than a flat plate, and thus can achieve more efficient heat dissipation. .

(2) Further, in order to further improve the heat dissipation efficiency and make the contact surface between the air flowing through the first flow path and the heat dissipation plate larger, the heat dissipation plate has a protruding portion that protrudes toward the first flow path side. Also good. The protrusions are, for example, conical, columnar, wall-like, ridge-like or other irregular shaped protrusions, and a plurality of such protrusions are regularly or irregularly upper surfaces (first surfaces) of the heat sink. May be. Moreover, it can be said that the above-mentioned bending and bending are also one form of such a protrusion. In addition to the above-described effects, for example, in a wall-like or ridge-like protruding portion, the effect of air rectification in the first space can be obtained depending on the arrangement.

Also, multiple types of protrusions may be combined. For example, a heat radiating plate having a ridge-like projection may be further bent in a stepped manner like the duct plate 130.

Also, the frame portion may have a protrusion as described above at the portion facing the first space. Thereby, the efficiency of cooling in the said part of a frame part also improves.

(3) The shape, number and arrangement of the through holes of the heat sink provided in the image display device according to the technology disclosed in the present application are not limited to the form of the through hole H40 included in the duct plate 130 shown in FIG. The through hole H40 shown in FIG. 6 has a slit shape, and in the assembled image display device 100, the duct plate 130 is positioned so that one or two are located between the two flexible wiring boards 126 when viewed from directly above. However, the present invention is not limited to such an embodiment. Further, it may be a long through hole such as a slit shape like the through hole H40, or may extend in a direction other than the left and right with a heat sink, or may be a shape other than a slit shape such as a circular shape. May be.

Also, the length of the first flow path is determined by the position of the through hole in the heat sink. Therefore, in order to make the first flow path longer in order to obtain a higher heat dissipation efficiency by increasing the contact surface between the air flowing through the first flow path and the heat radiating plate, the through hole is positioned closer to the front surface of the image display device, If another expression is made with reference to the image display device 100, the image display device 100 may be arranged at a position farther from the opening H10 (first opening). However, if there is a too narrow part in the first flow path, the air will stagnate and it will be difficult to flow into the second flow path, and instead the heat dissipation efficiency will be reduced, or it will cause overheating. Placement in is avoided. For example, if the space between the heat sink and the frame is narrow just above the display panel module and the air does not flow smoothly, the heat sink has a through hole in the area behind the display panel module. Good.

The mode of the through-hole which a heat sink has is related to heat dissipation efficiency, such as a flow rate of air from the first space to the second space, a contact area between the heat sink and air in the first space, or a heat conduction path in the heat sink. It can be appropriately determined in consideration of factors.

In addition, when the clearance between the heat sink and the surrounding structure (except for the thermal connection with the driver IC) can be secured, the first flow path is located on the front side of the image display device of the heat sink. It may reach the end portion, get over this end portion, flow downward, and switch to the second flow path. In this case, for example, the end may have a notch for securing the air flow rate at the location where the first flow path is switched to the second flow path. In the present disclosure, this notch is a deformation of the above-described through hole of the heat radiating plate, and is conceptually included as one type thereof. Alternatively, if the air flow rate at this location can be ensured by the above-described clearance, the heat radiating plate may not have such a through hole.

Securing a longer first flow path with such a configuration makes it possible to obtain a larger contact surface between the cooling air, the heat radiating plate, and the frame portion, thereby improving the heat radiation efficiency.

(4) From the viewpoint of securing a longer first flow path, and thus a larger contact surface between the air and the heat sink, the air that has once entered the first space from the outside is always in contact with the upper surface (first surface) of the heat sink. It is ideal to flow into the second space afterwards. Therefore, the heat sink may be in contact with the inner surface of the back surface portion of the back cover over the entire left and right direction. In the image display device 100 according to the embodiment, the inner surface of the back surface portion of the back cover 114 is a flat surface, and the end portion of the duct plate 130 on the back cover 114 side is a straight line. Further, as shown in the sectional view of FIG. 5, the end of the duct plate 130 is in contact with the inner surface of the back cover 114. Therefore, in the image display device 100, the air that has entered the first space from the opening H10 always comes into contact with the upper surface of the duct plate 130 before flowing into the second space. As described above, the shape of the end portion of the heat sink on the back cover side may follow the shape of the inner surface of the back surface of the back cover so that the heat sink contacts the inner surface of the back cover in a larger range.

(5) The fan 116 of the image display device 100 in the embodiment is disposed in the second space such that the exhaust port faces the opening H20 (second opening), and exhausts that generate a negative pressure in the space in the housing 110. Although it is a fan, the kind, arrangement | positioning, and number of fans with which the image display apparatus which concerns on the technique disclosed by this application is provided are not limited to such one exhaust fan. The fan may be any fan that discharges air flowing into the space in the housing 110 from the first opening through the second opening. For example, the air inlet is disposed in the first space so as to face the opening H10 (first opening). An intake fan may be provided. In this case, an intake fan is also provided in the opening H30 (third opening). Thereby, the first flow path as described above is generated in the first space, and the air that has passed through the first flow path escapes to the second space. Further, the air that has entered the second space from the first space flows through the second flow path and is discharged from the opening H20 due to the positive pressure generated in the second space, even if there is no fan in the opening H20.

Further, the exhaust fan or the intake fan may be located outside each opening.

Also, there may be multiple fans of the same type. For example, the housing may have a plurality of second openings, and an exhaust fan facing each second opening in the second space may be provided.

Further, a fan for sending the air in the first space to the second space may be provided in the through hole of the heat sink.

Also, the various fans described above may be used in combination.

(6) Each opening provided in the housing of the image display device according to the technology disclosed in the present application may be provided with a mesh or the like that prevents foreign substances from entering.

(7) In the image display device 100 according to the embodiment, the opening H10 is located above the opening H20, but the image display device according to the technique disclosed in the present application includes a first opening and a second opening provided in the housing. The positional relationship is not limited to this configuration. The first opening and the second opening need only be in a positional relationship that sandwiches the heat sink in the internal space. Depending on the shapes of the first opening, the second opening, and the heat sink, the first opening is the same as the second opening. It may be located below the height or second opening. Further, the positional relationship between the first opening and the second opening is not necessarily above the second opening depending on the shape of the housing and the attitude of the image display device in use.

(8) In the above-described embodiment and each modification, the first opening and the second opening have been described by using an example of a configuration in which the first opening and the second opening are individual holes penetrating the housing, but are disclosed in the present application. The image display apparatus according to the technology is not limited to this configuration.

For example, the first opening and the second opening are one continuous through hole on the housing, and the inner surface of the housing has a heat sink that divides the internal space into the first space and the second space across the through hole. You may arrange | position so that it may touch. In this case, the portion communicating with the first space of the through hole functions as the first opening, and the portion communicating with the second space functions as the second opening, so that the first opening and the second opening described above display an image. Provided to the device.

(9) In the image display device 100 according to the embodiment, the first space is in contact with the first surface of the duct plate 130 and is sandwiched between the first surface and the upper bezel 112A that is the upper portion of the frame portion. In the first space, the flow path along the first surface and the lower surface of the upper bezel 112A is the first flow path, but is not limited thereto. The frame portion is a portion that covers the periphery of the display panel module in the housing of the image display device, and a part of the back cover may be the frame portion. In this case, the first space is a space sandwiched between the first surface of the heat sink and the back cover, and the first flow path starts from the first opening, and the first surface of the heat sink and the back cover in the first space. Along the surface in contact with the first space. Hereinafter, such an example will be shown as a modification of the embodiment.

7 and 8 are external perspective views of a liquid crystal television 1010 including the image display device 1100 according to a modification of the above embodiment. FIG. 9 is a cross-sectional view of the liquid crystal television 1010 and a partially enlarged cross-sectional view of the image display device 1100. These sectional views and partial sectional views include a line IX-IX shown in FIG. 7, and a plane parallel to the YZ plane is a cut surface. In FIG. 7 to FIG. 9, components common to the above-described embodiment are denoted by common reference numerals, and description thereof is omitted. Hereinafter, this modified example will be described focusing on differences from the above-described embodiment.

In the image display device 1100, a housing 1110 that covers a portion other than the front surface of the display panel 120 is different from the housing 110 in that a bezel 1112 is provided instead of the bezel 112 and a back cover 1114 is provided instead of the back cover 114. The bezel 1112 includes an upper bezel 1112A at a position corresponding to the upper bezel 112A of the bezel 112 and a lower bezel 1112B at a position corresponding to the lower bezel 112B of the bezel 112.

The ratio that the bezel 1112 occupies in the width in the front-rear direction of the image display apparatus 1100 is smaller than the ratio that the bezel 112 occupies in the width in the front-rear direction of the image display apparatus 100. 7 to 9, the bezel 1112 covers the periphery of the image display device 1100 only a part of the front side, unlike the bezel 112 that covers the entire periphery of the image display device 100 in the front-rear direction.

On the other hand, the back cover 1114 covers the entire back surface of the image display device 1100 in common with the back cover 114 that covers the entire back surface of the image display device 100. However, the back cover 1114 has a wall extending forward (hereinafter referred to as an edge wall) around the periphery of the back cover 1114, and further covers the rear side portion of the periphery of the image display device 1100 that is not covered by the bezel 1112. The image forming apparatus 1100 is different from the back cover 114 in that it constitutes a part of the frame portion of the image display device 1100.

Since this edge wall is in contact with the upper bezel 1112A at the periphery of the image display device 1100, the temperature rises by absorbing the heat of the upper bezel 1112A. In the image display device 1100 in which the fan 116 is operating, as shown by the white arrow in FIG. 9, the surface that starts from the opening H <b> 10 and contacts the first space of the edge wall and the first surface of the duct plate 130. A first flow path is formed along. The air flowing through the first flow path advances while absorbing the heat of the edge wall of the back cover 1114 whose temperature has risen. That is, the duct plate 130 facing the first space and the edge wall of the back cover 1114 are cooled by air having a lower temperature that is taken in from the outside and flows through the first flow path.

As described above, the frame of the image display device includes a portion in which the temperature is likely to increase due to heating in the image display device by a component serving as a heat source. This part of the frame part may be composed only of a bezel, may be composed of a back cover, or may be composed of both. Any frame portion of the configuration is a target for which heat dissipation is promoted by the configuration of the image display device according to the present disclosure.

In addition, if the back cover 1114 in this modification is made of metal such as iron or aluminum, it absorbs the heat of the upper bezel 1112A better than that of resin such as polycarbonate, so Heat dissipation is performed more effectively. Further, the close contact of the edge wall with the upper bezel 1112A over a wider area promotes heat dissipation for the same reason. FIG. 9 shows an example in which the upper bezel 1112A and the edge wall are both folded back at the ends and contact each other on the surface.

Also, for example, there may be a case in which the bezel and the back cover are integrally formed, and there is no boundary between the bezel and the back cover that can be easily recognized. In the case of such a case, it should be understood that the part protecting the outer peripheral part of the display panel module is a bezel and the other part is a back cover.

(10) In the image display device 100 according to the embodiment, the duct plate 130 is thermally connected to the driver IC via the flexible wiring board 126, but the heat radiating plate in the image display device according to the technique disclosed in the present application. The form of thermal connection between the driver IC and the driver IC is not limited to this. For example, when the driver IC is disposed on the upper surface of the flexible wiring board, the heat radiation plate may be in direct contact with the driver IC to establish a thermal connection. In addition, the heat radiation plate and the driver IC are thermally connected in a mode that can be appropriately taken according to the connection mode between the display panel and the driver IC, the positional relationship between the members related to the connection between the display panel and the driver IC, and the surrounding members. obtain. For example, the inclusion for heat connection between the heat sink and the driver IC is not limited to the flexible wiring board of the embodiment, and may be a hard board, for example.

Also, if the inclusions are easy to contact with the heat sink on a wider surface, such as a flexible wiring board, the heat dissipation efficiency will be improved. In addition, when there is an inclusion, the shorter the distance between the heat sink and the driver IC into which the inclusion enters, the more efficiently the heat of the driver IC is transmitted by the heat sink.

(11) The image display device 100 in the embodiment is a liquid crystal display device including a direct type backlight using an LED that is a point light source, but the image display device according to the technique disclosed in the present application is not limited thereto. . For example, a liquid crystal display device having an edge-type backlight, or a display device having a display panel using an organic EL, and the like, the heat dissipation mechanism described above is applied to an image display device that incorporates components that can be a heat source and desires heat dissipation. be able to.

(12) Although the above embodiment and each modification have been described using a configuration that promotes heat dissipation of the frame portion located on one side of the rectangular image display device as an example, the technology disclosed in the present application The image display apparatus according to the invention is not limited to this configuration.

For example, in an image display device in which the same side is always located on the upper side in the use state, the heat dissipation plate is arranged so that the first space is provided along the side, so that the temperature easily rises in the frame portion. A configuration that promotes heat dissipation of the part is obtained. However, when the image display device is used, the degree of freedom of the posture is high, and when there are a plurality of sides that can be positioned on the upper side, or when the front surface of the display panel is substantially directly above or substantially below, When there is no difference or it is very small, the heat sink may be arranged so that the first space is provided along a plurality of sides. Further, for example, the heat radiating plate may be arranged so that the first space is provided along the side where the temperature is likely to rise due to the fact that it is in the vicinity of a component serving as a heat source regardless of the position on the image display device. That is, the heat sink is arranged so that the first space is provided in the internal space over the range where heat dissipation of the frame portion is desired, and along the surface facing the first space of the heat sink and the inner surface of the housing in the range. The first flow path may be formed.

Further, the range in which the first flow path is formed in the first space may be manually switched arbitrarily or automatically switched according to the posture at the time of use. For example, when an intake fan is provided in each of the plurality of first openings, the range in which the first flow path is formed can be switched by switching the fan to be operated.

[4. effect]
As described above, the image display device 100 according to the present embodiment includes the display panel module 180 that displays an image on the front surface, the housing 110, the driver IC 124, the fan 116, and the duct plate 130.

The casing 110 has a frame portion along the periphery of the display panel module 180 and a back surface portion facing the back surface of the display panel module 180, and is surrounded by the frame portion, the back surface portion, and the back surface of the display panel module. A first opening and a second opening for communicating with the outside.

The driver IC 124 is arranged in this internal space and drives the display panel module.

The fan 116 discharges air flowing into the internal space from the first opening through the second opening.

The duct plate 130 that is a heat sink and is thermally connected to the driver IC 124 is positioned between the first opening and the second opening in the internal space, and is one surface of the duct plate 130 in the internal space. A first flow path is formed in the first space in contact with the first surface, starting from the first opening and extending along the first surface and the surface facing the first space of the frame portion, and is the other surface of the duct plate 130. It arrange | positions so that the 2nd flow path which reaches the 2nd opening downstream from a 1st flow path may be formed in the space located in a surface side.

Thereby, the heat generated by the driver IC 124 is transmitted to the duct plate 130. The heat transmitted to the duct plate 130 enters the internal space from the outside of the image display device 100 and is absorbed by the air flowing through the first flow path. Thereby, the duct plate 130 heated by the heat from the driver IC 124 is cooled. The air flowing through the first flow path also cools the upper bezel 112A. The air heated while flowing through the first flow path flows into the second flow path across the duct plate 130 and is discharged out of the image display device 100. The image display device 100 that efficiently dissipates heat by such a heat dissipation mechanism has improved heat dissipation performance compared to a conventional image display device that does not have such a heat dissipation mechanism.

The first surface may be the upper surface of the heat sink.

Thereby, it is possible to efficiently dissipate the upper bezel which is easily heated by the heat generated inside the image display device 100.

Moreover, the duct plate 130 may have a through hole H40 that passes between the first surface and the second surface and allows the air flowing through the first flow path to pass through the second flow path.

This forms a flow path of air that smoothly flows from the first space to the second space in consideration of heat dissipation efficiency.

Moreover, the duct plate 130 may have a protrusion that protrudes toward the first flow path.

This ensures a wider contact area between the duct plate 130 and the air flowing through the first flow path, and improves the heat dissipation efficiency.

Thus, in each of the image display devices described above, a rise in the temperature of the driver IC 124 can be suppressed as a result of improving the heat dissipation performance. As a result, thermal runaway of the driver IC 124, thermal deterioration of surrounding components, display failure such as luminance unevenness caused by heat transmitted to the liquid crystal cell of the display panel 120 via the flexible wiring board, and other troubles of the image display device 100 due to heat. Occurrence is suppressed. In addition, since the temperature rise of the bezel 112 is suppressed, it is possible to prevent the person who touched the bezel 112 from feeling uncomfortable due to unexpected heat.

As described above, the embodiments have been described as examples of the technology in the present disclosure. For this purpose, the accompanying drawings and detailed description are provided.

Accordingly, among the components described in the attached drawings and detailed description, not only the components essential for solving the problem, but also the components not essential for solving the problem in order to exemplify the above technique. May also be included. Therefore, it should not be immediately recognized that these non-essential components are essential as those non-essential components are described in the accompanying drawings and detailed description.

Moreover, since the above-mentioned embodiment and its modification are for illustrating the technique in the present disclosure, various modifications, replacements, additions, omissions, etc. may be made within the scope of the claims or an equivalent scope thereof. it can.

The present disclosure can be applied to an image display device. As a more specific example, the present disclosure is applicable to a television receiver, a monitor display, a digital signage, or the like.

10, 1010

LCD TV

100, 1100

Image display device

110, 1110

Case

112, 1112

Bezel

112A,

1112A Upper bezel

112B,

1112B Lower bezel

114, 1114 Back cover 116 Fan 120 Display panel 122 Relay board 124 Driver IC (Drive integrated circuit) )
126 Flexible wiring board 130 Duct plate (heat sink)
140 Panel holder 150 Optical sheet unit 160 LED board 170 Backlight chassis 180 Display panel module 182 Signal circuit board 184 Power circuit board 190 Control circuit board 200 Stand H10, H20, H30 Opening H40 Through hole

Claims

A display panel module that displays images on the front,
A frame portion along a periphery of the display panel module and a back surface portion facing the back surface of the display panel module; and an internal space surrounded by the frame portion, the back surface portion, and the back surface of the display panel module, and the outside. A housing having a first opening and a second opening that communicate with each other;
A driver IC (integrated circuit) disposed in the internal space and driving the display panel module;
A fan for discharging air flowing into the internal space from the first opening through the second opening;
A heat sink thermally connected to the driver IC in the internal space,
The heat radiating plate is located between the first opening and the second opening in the internal space, and in the first space in contact with the first surface which is one surface of the heat radiating plate, in the internal space. A space that is formed on the second surface side that is the other surface of the heat radiating plate and that forms a first flow path that extends from the first opening and faces the first surface and the first space of the frame portion. And an image display device arranged to form a second flow path downstream of the first flow path and reaching the second opening.
The image display device according to claim 1, wherein the first surface is an upper surface of the heat radiating plate.
The image according to claim 1, wherein the heat radiating plate has a through hole that passes between the first surface and the second surface and allows air that has flowed through the first flow path to pass through the second flow path. Display device.
The image display device according to claim 1, wherein the heat radiating plate has a protruding portion that protrudes toward the first flow path.