Image display device

Abstract

This invention provides an image display device that can improve the reliability of an image display device by cooling the display panel with a simple structure. [Solution] The image display device 10 comprises a display panel 22 for displaying images, a chassis 21 that supports the display panel 22 from the front, a first circuit board 41 fixed to the back of the chassis 21, and a back cover 30 that houses these inside, wherein the back cover 30 has a first ventilation opening provided so as to face the first circuit board.

Description

Technical Field

[0001] The present invention relates to an image display device including a display panel for displaying an image.

Background Art

[0002] In recent years, the demand for organic EL TVs equipped with organic EL panels has been rapidly increasing. An organic EL TV having a self-emitting organic EL element is characterized by a high contrast ratio and a clear image quality with distinct light and dark compared to conventional liquid crystal TVs. In addition, since a backlight source is not required like a liquid crystal TV, a thinner TV can be realized, and it has excellent designability.

[0003] On the other hand, since the organic EL element contains an organic substance in the light-emitting layer and a large current flows through the element, deterioration due to the temperature of the element is more serious than that of liquid crystal TVs and plasma displays. Therefore, when designing an organic EL TV, if attention is not paid to making the temperature of the display panel lower and the temperature distribution uniform, the reliability of the TV will decrease, and problems such as image sticking of a specific pattern and reduction in brightness will occur early.

[0004] Generally, the back surface of the display panel of an organic EL TV is covered with a resin housing called a back cover, and a circuit board is housed between the image display panel and the back cover. In recent years, due to high-density mounting, increased output, and thinning of electronic components, the amount of heat generated from the circuit board during driving has increased, so the display device tends to become high temperature.

[0005] That is, when an organic EL TV is driven, in addition to the image display panel acting as a heat source, the circuit board also acts as a heat source that raises the temperature of the organic EL panel. In order to cool such a display device such as an organic EL TV at low cost with a simple structure, a structure having a vent in the back cover to cause natural convection due to the chimney effect and cooling the display panel by heat dissipation by air cooling is effective, and various methods have been proposed hitherto.

[0006] Patent documents 1 and 2 disclose configurations that utilize the chimney effect of airflow for the purpose of cooling display devices. However, in the configuration of Patent Document 1, the chimney effect is provided on the side of the display panel that displays the image (front type), which causes the display panel to heat up, raising concerns about image quality degradation such as a decrease in contrast and deterioration of viewing angle dependence, where the image quality changes depending on the viewing angle. On the other hand, in the configuration of Patent Document 2, a tray member that provides the chimney effect is provided between the circuit board and the side of the display panel that does not display the image (back side), so no deterioration in image quality is observed. However, a large space is required between the back cover and the display panel, which increases the thickness of the OLED TV, reducing the design appeal of the product and increasing costs.

[0007] As described above, heat dissipation technology using the chimney effect in OLED TVs has been extensively studied in the past. However, the positional relationship between the ventilation holes in the back cover and the heat-generating electronic components has not been optimized, and there is still room for further consideration. For example, if heat dissipation is required from a specific location, such as the center of the display device, simply having ventilation holes on the bottom and top of the display device is insufficient. Even if the bottom of the display device is able to dissipate heat, the heat dissipation effect in the center may not be high, and further consideration is needed. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Japanese Patent Application Publication No. 09-275534 [Patent Document 2] Japanese Patent Publication No. 2014-59502 [Overview of the Initiative] [Problems that the invention aims to solve]

[0009] The present invention provides an image display device that can improve the reliability of an image display device by cooling the display panel with a simple structure. [Means for solving the problem]

[0010] The image display device according to the present invention comprises a display panel for displaying an image, a chassis supporting the display panel on its front, a first circuit board fixed to the rear of the chassis, and a back cover housing these inside, wherein the back cover has a first ventilation opening provided facing the first circuit board. [Effects of the Invention]

[0011] According to the present invention, the heat inside the back cover 30, which includes the display device 20 of the image display device 10, can be dissipated more efficiently than with conventional heat dissipation structures. In particular, it is possible to lower the temperature of the central part of the display device 20, where temperature rises are generally likely to occur, thereby contributing to improved reliability of the image display device. [Brief explanation of the drawing]

[0012] [Figure 1] Figure 1 is a perspective view showing the external appearance of an image display device according to an embodiment. [Figure 2] Figure 2 is a perspective view of the image display device according to the embodiment, taken from the rear. [Figure 3] Figure 3 is a schematic diagram showing a cross-section of the image display device according to the embodiment, along the line III-III in Figure 1. [Figure 4A] Figure 4A is a schematic diagram showing a cross-section of the image display device according to Modification 1, along the line IV-IV in Figure 1. [Figure 4B] Figure 4B is a schematic diagram of the back cover of the image display device according to Modification 1, viewed from the front. [Figure 4C] Figure 4C is a schematic diagram of the image display device according to Modification 1, viewed from the back. [Figure 5] Figure 5 is a schematic diagram showing a cross-section of the image display device according to Modification 2, along the line V-V in Figure 1. [Figure 6] Figure 6 is a schematic diagram showing a cross-section of the image display device according to Modified Example 2, along the line VI-VI in Figure 1. [Figure 7A]FIG. 7A is a schematic diagram showing a cross section of the image display device 10 according to Modification 3 taken along line VII-VII of FIG. 1. [Figure 7B] FIG. 7B is a schematic diagram of the vibrating body 42 viewed downward from the air vent 36. [Figure 8A] FIG. 8A is a diagram showing an image display device according to a comparative example. [Figure 8B] FIG. 8B is a diagram showing an image display device according to a comparative example.

Embodiments of the Invention

[0013] Hereinafter, implementation will be described with appropriate reference to the drawings. However, detailed descriptions may be omitted as necessary. For example, detailed descriptions of well-known matters and redundant descriptions of substantially the same configurations may be omitted. This is to avoid making the following descriptions unnecessarily redundant and to facilitate the understanding of those skilled in the art.

[0014] (Embodiment) Hereinafter, an embodiment will be described with reference to FIGS. 1 to 7. In FIGS. 1 to 7, the width direction of the image display device 10 is the X-axis direction, the depth direction of the image display device 10 is the Y-axis direction, and the height direction of the image display device 10 is the Z-axis direction. At this time, in the width direction, the positive direction of the X-axis is to the left, and the negative direction is to the right. At this time, in the depth direction, the positive direction of the Y-axis is forward, and the negative direction is backward. At this time, in the height direction, the positive direction of the Z-axis is upward, and the negative direction is downward.

[0015] [1. Configuration of Image Display Device] First, the configuration of the image display device 10 according to the embodiment will be described with reference to FIGS. 1 and 2.

[0016] FIG. 1 is a perspective view showing the appearance of the image display device 10 according to the embodiment. The image display device 10 includes a display device 20, a back cover 30, a circuit board 40, and a stand 50. In FIG. 1, the circuit board 40 is omitted from the figure because it is stored inside the back cover 30.

[0017] The display device 20 is a display unit on a panel. The display device 20 has a chassis 21 and a display panel 22. The chassis 21 is a plate-shaped member for supporting various components, and is formed by pressing or other processes on a metal plate made of, for example, aluminum or iron. The chassis 21 and the display panel 22 are bonded together such that the front of the chassis 21 and the back of the display panel 22 face each other. The bonding material used is double-sided adhesive tape or adhesive.

[0018] The back cover 30 has a vent 31 (first vent) and a vent 32 (second vent). The back cover 30 is fixed to the chassis 21. The vent 31 is located below the center line B of the display panel 22 and is formed as a vent for drawing in outside air. Although the center line A is also shown in the figure, center line A is the center line of the display panel 22 in the Z-axis direction, and center line B is the center line of the display panel 22 in the X-axis direction. The same applies to the image display device 10 shown below. The vent 32 is located above the center line B of the display panel 22 and is formed as a vent for expelling air from inside the back cover 30. It is desirable that the vent 32 be located below the vibrating body 42. The positional relationship between the vent 32 and the vibrating body 42 will be described later. Furthermore, in this embodiment, the position of the vents is based on the center line B of the display panel 22, but it is sufficient that vent 32 is at least above vent 31. Also, it is desirable that the positional relationship between the first vent and the second vent be on the same line in the Z-axis direction.

[0019] The circuit board 40 consists of various circuit boards for controlling the image display device 10. These various circuit boards include, for example, a heating element 41, a vibrating element 42, a power supply board 43, and a signal board 44. The circuit board 40 is fixed to the chassis 21 by, for example, bosses (not shown) erected on the chassis 21. Furthermore, the circuit boards 40 are electrically connected to each other, for example. Some of the circuit boards 40 may also be electrically connected to the display panel 22 by a plurality of conductive cables. In this embodiment, the circuit board 40 is not located in the center of the display device 20. The center of the display device 20 refers to the intersection of center line A and center line B and the surrounding area.

[0020] The heating element 41 is a circuit that drives the display device 20, for example, a panel controller. The heating element 41 is connected to the back of the display panel via a support column 41a. When driving the display panel 22, the heating element 41 generates a lot of heat itself, significantly raising the temperature around the heating element 41. In this embodiment, the heating element 41 is fixed to the chassis 21 below the center line B. The vibrating element 42 is a vibrating element that has the function of producing sound output and is composed of a speaker, woofer, etc.

[0021] The vibrating element 42 has a configuration that has the function of outputting sound. The vibrating element 42 includes, for example, an actuator unit. In other words, the vibrating element 42 is a circuit board that generates little to no heat compared to the heating element 41 which generates heat due to panel driving. The vibrating element 42 is fixed to the chassis 21 above the center line B. The configuration of the power supply board 43 and the signal board 44 will be described later. In this embodiment, one circuit board 40 is shown, but there may be multiple to realize each function, or they may be omitted. The detailed configuration of the back cover 30 and the circuit board 40 will be described later.

[0022] The stand 50 is a base that supports the display device 20 and the back cover 30.

[0023] Figure 2 is a perspective view of the image display device 10 according to the embodiment, as seen from the rear. Note that Figure 2 shows the device with the back cover 30 removed. The side of the image display device 10 facing forward in the depth direction is referred to as the "front" of the image display device 10, and the side of the image display device 10 facing backward in the depth direction is referred to as the "rear" of the image display device 10.

[0024] As shown in Figure 2, the image display device 10 includes a chassis 21, a circuit board 40, and a stand 50 on its rear.

[0025] The circuit board 40 is fixed to the rear side of the chassis 21. At this time, the heat sources of the image display device 10 are the display panel 22 fixed to the front of the chassis 21 and the heat-generating circuit board 40 provided on the rear side of the chassis 21. The heat-generating circuit board 40 is the heat-generating element 41. At this time, the heat from the display panel 22 is released to the outside air through natural convection and thermal radiation via the chassis 21, and the heat from the heat-generating element 41 is released to the outside air through the vent 32 by the airflow 33 circulating inside the back cover 30.

[0026] Next, the airflow caused by the heat generated by the circuit board 40 will be explained using Figure 3.

[0027] Figure 3 is a schematic diagram showing a cross-section of the image display device 10 according to the embodiment, along the line I-I in Figure 1. In Figure 3, an airflow 33 is shown indicating the flow of air. Note that in Figure 3, the stand 50 of the image display device 10 is omitted.

[0028] The chassis 21 of the display device 20 has a circuit board 40 fixed to its rear side, which includes a heating element 41, a vibrating element 42, a power supply board 43, and a signal board 44.

[0029] The back cover 30 has a ventilation opening 31 and a ventilation opening 32. In this case, the ventilation opening 31 is formed in the back cover 30 at a position facing the heating element 41, and the ventilation opening 32 is formed in the back cover 30 at a position facing the heating element 41 or below the position facing the heating element 41.

[0030] As mentioned above, the circuit board 40 includes circuit boards that become heat sources when the panel is driven, such as the heat-generating element 41. On the other hand, the circuit board 40 also includes circuit boards that do not become heat sources, or are less likely to become heat sources, when the panel is driven, such as the vibrating element 42. In this case, if the positional relationship is as shown in Figure 3, a temperature difference will occur between the heat-generating element 41 and the vibrating element 42. Specifically, less heat is generated in the upper part where the vibrating element 42 is located compared to the lower part where the heat-generating element 41 is located. Therefore, the space formed by the chassis 21 and the back cover 30 generates an upward airflow between the heat-generating element 41 and the vibrating element 42 due to this temperature difference, and generates an airflow 33 passing through the vents 31 and 32.

[0031] Let's explain the specific airflow of airflow 33.

[0032] The heat generated by the heating element 41 draws air from outside the back cover 30 through the vent 31 and into the space formed by the chassis 21 and the back cover 30 in the direction of airflow 33(a). The drawn-in air enters upward through the vent 31, passing over the heating element 41 and the center of the display device 20 as airflow 33(b). The vibrating element 42 then guides the direction of airflow 33(c), causing it to be discharged through the vent 32. At this time, the presence of the vibrating element 42 near the vent 32 acts as an obstacle, preventing further upward movement of the airflow 33. This configuration allows for an increase in the flow rate discharged to the vent 32. In other words, the image display device 10 of this embodiment, with its simple configuration, can more effectively cool the central part by increasing the airflow velocity due to the chimney effect.

[0033] In addition, the vibration of the vibrating body 42 has the effect of further increasing the airflow rate discharged to the vent 32. This is because the vibration of the vibrating body 42 causes the air near the vibrating body 42 to vibrate, generating air convection. This convection promotes the outward flow of air from the vibrating body 42, that is, the airflow from the vibrating body 42 to the back cover 30, allowing air to be discharged more effectively from the vent 32 in the back cover 30. Furthermore, from the viewpoint of more effectively generating air vibrations due to vibration, it is preferable that the vibrating body 42 is a woofer that emits sound waves in the low frequency range. The distance C between the back of the chassis 21 and the front of the back cover 30, i.e., the inner wall, is not particularly limited, but in order to effectively obtain the chimney effect, a narrower distance C results in a faster airflow velocity. Specifically, the distance C is preferably 5 mm or more, and more preferably 10 mm or more. There is no particular upper limit, but it is aesthetically preferable to be 60 mm or less. In addition, the vibrating body 42 generates air convection through its own vibration, causing the airflow 33 to flow to the outside of the back cover 30. Furthermore, by being positioned above or near the vent 32, the vibrating body 42 prevents the airflow 33 from rising further inside the back cover 30, thereby guiding the direction of the airflow 33(c) and increasing the flow rate discharged from the vent 32. The vibrating body 42 may also be bonded to the inner wall of the back cover 30. Alternatively, the vibrating body 42 and the back cover 30 may be in contact via a buffer material on the back of the vibrating body 42. These configurations promote the flow of airflow 33 to the outside of the back cover 30 through the vent 32 through the vibration and position of the vibrating body 42. The design may also take into account the amplitude of vibration of the entire vibrating body 42 caused by structures such as actuators inside the vibrating body 42. Specifically, the distance F between the back of the vibrating body 42 and the inner wall of the back cover 30 may be set. The distance F is set to be greater than or equal to the amplitude of the vibrating body 42, and may be a value that provides a margin in addition to the amplitude of the vibrating body 42. For example, if the amplitude of the vibrating body 42 is 5 mm and a margin of 2 mm is provided, the distance F is set to 7 mm. With these configurations, interference between the vibrating body 42 and the back cover 30 due to the vibration of the vibrating body 42 can be reduced, and the generation of abnormal noise can be suppressed.Therefore, the vibration and arrangement of the vibrating body 42 can sufficiently produce the effect of causing the airflow 33 to flow to the outside of the back cover 30 through the vent 32.

[0034] As described above, the heating element 41 is connected via a support column 41a, and the length of the support column 41a is the distance between the heating element 41 and the back of the chassis 21. If the length of the support column 41a is too short, the heat emitted by the heating element 41 will significantly raise the temperature of the display device 20, which is undesirable. The length of the support column 41a is preferably 10 mm or more, and more preferably 20 mm or more.

[0035] The image display device 10 includes a power supply board 43 and a signal board 44 as circuit boards. Here, it is preferable that the power supply board 43 and the signal board 44 are arranged so that they do not pass through the center line A. With this structure, the image display device 10 does not obstruct the airflow 33 flowing inside the back cover 30, and is able to more effectively cool the center of the display panel. Furthermore, the power supply board 43 and the signal board 44 can be installed on only the left or right side, and the functions of the power supply board 43 and the signal board 44 can be combined into a single board, but it is preferable that they be installed on opposite sides of the center line A. With this structure for the power supply board 43 and the signal board 44, the temperature difference between the center and the edges is mitigated by the heat generated from each board, and the temperature of the display panel surface can be made more uniform.

[0036] The heating element 41, the vibrating element 42, the power supply board 43, and the signal board 44 are each connected by multiple conductive cables, and it is preferable that these cables are installed so as not to obstruct the airflow 33. With this configuration, when the conductive cables pass through the center of the display device 20 through which the airflow 33 flows or near thereto, it is preferable that they are attached to either the back of the chassis 21 or the inside of the back cover 30 with adhesive tape or the like, and it is more preferable that they are attached to the inside of the back cover 30 so that the airflow 33 and the back of the display device 20 can be directly cooled.

[0037] [2. Effects] The image display device 10 according to this embodiment comprises a display device 20, a back cover 30, and a stand 50, the back cover 30 having a heating element 41 with ventilation holes 31 and 32.

[0038] With this configuration, air drawn in through the vent 31 passes through the center of the display device as an airflow 33 and is discharged through the vent 32, thereby effectively cooling the center of the display device 20.

[0039] [3. Comparative Examples] Comparative examples of the present invention will be described using Figures 8A and 8B. Figures 8A and 8B show an image display device according to the comparative example. In the comparative example, the back cover 30 does not have vents 31 and 32, as shown in Figure 1, etc. Also, the vibrating body 42 is provided in the center of the display device 20. Conventionally, the vibrating body 42 has been generally installed in the center of the image display device 10 for the purpose of outputting sound from the center of the image display device 10.

[0040] In the comparative example configuration, the absence of vents 31 and 32 makes it difficult to generate airflow 33. Furthermore, because the vibrating body 42 is located in the center, the generated airflow cannot cool the center of the display device 20, causing the temperature of the center of the display device 20 to rise and making it prone to problems such as burn-in on the image display device 10.

[0041] (Variation 1) A modified example of the present invention will be described using Figures 4A, 4B, and 4C.

[0042] Figure 4A is a schematic diagram showing a cross-section of the image display device 10 according to Modification 1, along the line IV-IV in Figure 1. Figure 4B is a schematic diagram showing the back cover 30 of the image display device 10 according to Modification 1 as viewed from the front.

[0043] In Modification 1, as shown in Figures 4A and 4B, a beam 34 is provided inside the back cover 30. The presence of the beam 34 improves the flow velocity of the airflow 33, allowing the display device 20 to be cooled more effectively. The beam 34 also has the secondary effect of improving the mechanical strength of the back cover 30. The size of the beam 34 is not particularly limited, but for example, the beam 34 shown in Figure 4A preferably has a distance L1 of 100 to 200 mm, a height of 10 to 20 mm, and a width of 0.5 to 1.2 mm. The beam 34 may be used alone, but it is more preferable to have multiple beams, and its material is not particularly limited, but for example, it may be made of the same material as the back cover 30. Specifically, by making the back cover 30 and the beam 34 from the same material, the beam 34 may be formed simultaneously during the manufacturing of the back cover 30. Although not shown, the beam 34 may also have the same length as the Z-axis direction of the chassis 21.

[0044] Figure 4C is a schematic diagram of the image display device 10 according to Modification 1, viewed from the back. Note that Figure 4C shows the device with the back cover 30 removed. In addition, as shown in Figure 4C, Modification 1 includes an insulating block 45 between the heating element 41 and the vibrating element 42, and the power supply board 43 and the signal board 44. By providing the insulating block 45, the heat generated by the power supply board 43 and the signal board 44 is insulated from the center of the display device 20, and the center of the display device 20 can be cooled more effectively. The size of the insulating block 45 is not particularly limited, but for example, as shown in Figure 4C, the distance L2 is preferably in the range of 200 to 700 mm, H2 is preferably in the range of 10 to 20 mm, and W2 is preferably in the range of 30 to 60 mm. The heat insulating block 45 may be used individually, but it is more preferable to have at least two of them, both between the heating element 41 and vibrator 42 and the power supply board 43, and between the heating element 41 and vibrator 42 and the signal board 44. The material of the heat insulating block 45 is not particularly limited, but the same material as the back cover 30 or a sponge material can be suitably used.

[0045] Therefore, the configuration of Modified Example 1 improves the flow velocity of the airflow 33 to promote heat dissipation from the center of the display device 20, and prevents heat generated from the power supply boards 43 and 44 from reaching the center of the display device 20, thereby more effectively cooling the center of the display device 20.

[0046] (Modification 2) A modified example of the present invention, Part 2, will be described using Figure 5.

[0047] Figure 5 is a schematic diagram showing a cross-section of the image display device 10 according to the modified example 2, along the line V-V in Figure 1.

[0048] In the modified example 2, as shown in Figure 5, a cushion member 46a is provided between the display device 20 and the heating element 41, and a cushion member 46b is provided between the display device 20 and the vibrating body 42. Although cushion members 46a and 46b have the same effect of equalizing the surface temperature of the display device 20, they have different roles. Cushion member 46a insulates the heat transmitted from the heating element 41 to the display device 20. That is, cushion member 46a plays a role in suppressing the temperature rise of the display device 20 caused by the heating element 41. On the other hand, cushion member 46b insulates the heat transmitted from the display device 20 to the vibrating body 42. That is, cushion member 46b can keep the temperature of the vibrating body 42 and the surrounding temperature constant, and can ensure a temperature difference with the heating element 41. Therefore, by providing cushion member 46a and / or cushion member 46b, the temperature difference between the heating element 41 and the vibrating body 42 is maintained, thereby maintaining the chimney effect inside the back cover 30.

[0049] Furthermore, the cushion members 46a and 46b may be formed as a single unit or may be separate. Specifically, multiple cushion members 46b may be provided on the vibrating body 42.

[0050] Furthermore, the cushioning member 46b may have a function to prevent the audio output of the vibrating body 42 from being transmitted to the display device 20. In other words, the vibrating body 42 may be configured such that the cushioning member 46b suppresses the transmission of vibrations to the front side of the panel of the display device 20, and the audio output is emitted from the back of the back cover 30. This configuration can suppress the generation of abnormal noises caused by the vibrating body 42.

[0051] Furthermore, cushion members 46a and 46b may be made of the same material or of different materials. The materials used for cushion members 46a and 46b are not particularly limited, but any material that can achieve the above effects is acceptable. Specifically, cushion members 46a and 46b can preferably be made of foamed resin such as foamed urethane, composite sheets made by laminating metal and resin, glass wool, etc.

[0052] Therefore, the configuration of the modified example 2 can suppress the generation of abnormal noise caused by the vibrating body 42, promote heat dissipation inside the back cover 30, and make the surface temperature distribution of the display panel 22 in the display device 20 more uniform.

[0053] (Modification 3 of the embodiment) A modified example of the present invention, Part 2, will be described using Figure 6.

[0054] Figure 6 is a schematic diagram showing a cross-section of the image display device 10 according to the modified example 2, along the line VI-VI in Figure 1.

[0055] In the modified example 3, as shown in Figure 5, the first member 42a, which is part of the vibrating body 42, is exposed from the back cover 30. In this case, the second member 42b, which is part of the vibrating body 42 located inside the back cover 30, and the back cover 30 are separated by a distance F'. The distance F' is determined by the amplitude of the second member 42b of the vibrating body 42, and specifically, it may be a value that includes a margin in addition to the amplitude of the vibrating body 42. With these configurations, the back cover 30 can be made thinner in the Y-axis direction distance of the first member 42a, and interference between the second member 42b and the back cover 30 due to the vibration of the vibrating body 42 can be reduced. Furthermore, in the vibration of the vibrating body 42, if the first member 42a is a vibrating member such as an actuator, it will have the maximum amplitude in the vibrating body 42, and the effect of thinning the back cover 30 will be maximized.

[0056] Furthermore, since a portion of the vibrating element 42 (for example, the first member 42a) is positioned outside the back cover 30, the sound is output directly to the back of the image display device 10. This structure prevents sound output from the vibrating element 42 from being lost inside the back cover 30 and allows it to be output to the outside of the image display device 10.

[0057] Therefore, with the configuration of the modified example 3, the heat dissipation effect inside the back cover 30 can be maintained, and the thickness of the back cover 30 can be reduced by the amount of the first member 42a. In addition, the sound output by the vibrating body 42 can be output directly to the outside of the back cover 30, in this case to the back of the back cover 30, and the generation of abnormal noise caused by the vibrating body 42 can be suppressed by providing the cushioning member 46b.

[0058] (Modification 4 of the embodiment) A fourth modified example of the present invention will be described using Figures 7A and 7B.

[0059] Figure 7A is a schematic diagram showing a cross-section of the image display device 10 according to modified example 4, along the line VII-VII in Figure 1. Figure 7B is a schematic diagram showing the vibrating body 42 viewed downwards from the vent 36.

[0060] In Modification 4, in addition to the vents 31 and 32 on the back of the back cover 30, there is a vent 35 on the bottom surface of the back cover 30 and a vent 36 on the top surface. By adding these vents, the flow rate of the airflow 33 can be increased. In addition, the front of the vibrating body 42 and the back of the chassis 21 of the display device 20 are separated by a distance D by a support member 47a, and as shown in Figure 7B when viewing the vibrating body 42 downwards from the vent 36, there is a space 47b that serves as a passage for the airflow. Here, the lower limit of the distance D is preferably 5 mm or more, more preferably 10 mm or more, and the upper limit is preferably 20 mm or less. Furthermore, in Modification 4, there is a recess 37 on the back of the back cover 30, and the distance between the center of the recess 37 and the display device 20 is denoted by E, and the relationship between the aforementioned distance C and distance E is C > E. The presence of the recess 37 increases the flow velocity of the airflow 33, allowing the center of the display device 20 to be cooled more effectively. On the other hand, distance E is also determined by the relationship between the back surface of the heating element 41 and the inner wall of the display device 20, and E > G is necessary in order not to obstruct the airflow 33. The lower limit of distance E is preferably 15 mm or more, the upper limit is preferably 40 mm or less, and more preferably 30 mm or less.

[0061] According to Modification 4, increasing the flow rate and velocity of the airflow 33 allows for more effective cooling of the central part of the display device 20. In addition, by circulating the airflow across the entire top and bottom of the display panel and insulating the vibrating body 42 and the display device 20 with the support member 47a and the space 47b, the temperature distribution of the display panel becomes more uniform.

[0062] In this case, the support member 47a and the cushion member described above may have the same configuration.

[0063] Therefore, the configuration of Modified Example 4 improves the flow velocity and flow rate of the airflow 33, promotes heat dissipation from the center of the display device 20, and further makes the surface temperature distribution of the display device 20 more uniform.

[0064] In the above embodiment, cushion members 46a and 46b are provided between the heating element 41 and the vibrating element 42 and the display device 20, respectively. However, the embodiment is not limited to this, and may be similarly provided on other circuit boards 40, for example.

[0065] (Other embodiments) As described above, embodiments have been explained as examples of the technology disclosed in this application. However, the technology in this disclosure is not limited thereto and can be applied to embodiments that are modified, replaced, added, or omitted as appropriate. Furthermore, it is possible to create new embodiments by combining the components described in the above embodiments.

[0066] As described above, embodiments have been explained as examples of the technology in this disclosure. For this purpose, accompanying drawings and a detailed description have been provided.

[0067] Therefore, the components described in the attached drawings and detailed descriptions may include not only components essential for solving the problem, but also components that are not essential for solving the problem, provided that they illustrate the technology described above. For this reason, the mere presence of these non-essential components in the attached drawings and detailed descriptions should not be immediately assumed to mean that they are essential.

[0068] Furthermore, since the embodiments described above are for illustrative purposes of the technology described herein, various modifications, substitutions, additions, omissions, etc., can be made within the scope of the claims or equivalents thereof. [Industrial applicability]

[0069] The image display device according to the present invention is useful as a cooling structure for an image display device because it can effectively cool the central part of the display device by utilizing a circuit board that acts as a heat source and generates heat when the panel is driven. [Explanation of Symbols]

[0070] 10 Image display device 20 Display equipment 21 Chassis 22 Display Panel 30 Back cover 31, 32, 35, 36 Ventilation holes 33, 33A, 33B, 33C Airflow 34 Beam 40 Circuit boards 41 Heating element 41a Post 42 Vibrating Body 43 Power supply board 44 Signal board 46a, 46b Cushioning material 47a Support member 47b Space 50 Stands

Claims

1. A display panel that displays images, A chassis supporting the aforementioned display panel on its front, A first circuit board fixed to the rear of the chassis, An image display device comprising a back cover that houses these inside, The back cover has a first ventilation opening that is positioned opposite the first circuit board. Image display device.

2. The second circuit board is located on the rear of the chassis and above the first circuit board. The back cover has a second ventilation opening located below the second circuit board. The image display device according to claim 1.

3. The first circuit board is located above the chassis or the back cover. The image display device according to claim 1 or 2.

4. The second circuit board is located below the chassis or the back cover. The image display device according to any one of claims 1 to 3.

5. The second circuit board is a vibrating element. The image display device according to any one of claims 1 to 4.

6. The distance to the aforementioned back cover is, Determined based on the amplitude originating from the second circuit board. The image display device according to claim 5.

Images