JP2022128277A - image display device - Google Patents

Abstract

To provide an image display device in which deviation in temperature distribution of a display panel can be solved easily.SOLUTION: An image display device 100 includes a display panel 10 of a self-light-emitting type that displays an image on a front surface, and a heat transfer material 20 with a heat transfer property that is disposed in contact with a back surface of the display panel 10. The heat transfer material 20 includes a plurality of holes 23 provided to a surface in contact with the display panel 10. The holes 23 are provided to a surface of the heat transfer material 20 so that a contact area in contact with the display panel 10 per unit area of a first part 21 of the heat transfer material 20 facing a high-temperature region R11 of the display panel 10 with a relatively high temperature becomes larger than a contact area in contact with the display panel 10 per unit area of a second part 22 of the heat transfer material 20 facing a low-temperature region R12 of the display panel 10 with a relatively low temperature.SELECTED DRAWING: Figure 3

Description

The present disclosure relates to an image display device including a self-luminous display panel.

In Patent Document 1, in a self-luminous display panel (hereinafter referred to as a display panel) in which the temperature distribution is biased in the plane and the high temperature part and the low temperature part are relatively divided, the high temperature part of the display panel is supported. There is disclosed a technique of canceling the bias in the temperature distribution of the display panel by making the thermal conductivity of the portion corresponding to the low-temperature portion higher than that of the portion corresponding to the low-temperature portion.

Japanese Patent Application Laid-Open No. 2006-18171

The present disclosure provides an image display device that can easily eliminate bias in temperature distribution due to individual differences in display panels.

An image display device according to an aspect of the present disclosure includes a self-luminous display panel that displays an image on the front surface, and a heat transfer material that is disposed in contact with the back surface of the display panel and has thermal conductivity. The heat transfer material has a plurality of holes provided on a surface in contact with the display panel, and the plurality of holes face a high-temperature region of the display panel having a relatively high temperature. The contact area in contact with the display panel per unit area of the first portion of the heat transfer material is the unit area of the second portion of the heat transfer material facing the low temperature region where the temperature of the display panel is relatively low. It is provided on the surface of the heat transfer material so as to be larger than the contact area in contact with the display panel at the perimeter.

The image display device according to the present disclosure can easily eliminate unevenness in the temperature distribution of the display panel.

FIG. 1 is a diagram showing an example of the appearance of an image display device according to an embodiment. FIG. 2 is a cross-sectional view of the configuration of the image display device according to the embodiment, excluding the housing. FIG. 3 is an enlarged view of area A1 in FIG. FIG. 4 is a schematic diagram of temperature distribution occurring in the display panel according to the embodiment. FIG. 5 is a plan view of the heat transfer material according to the embodiment. FIG. 6 is an enlarged view of an area corresponding to the area A1 in FIG. 2 of the image display device according to Modification 1. As shown in FIG. FIG. 7 is a cross-sectional view of the configuration of the image display device according to Modification 2, excluding the housing. FIG. 8 is a diagram showing an outline of the temperature distribution occurring in the display panel according to Modification 2. As shown in FIG. 9 is a plan view of a heat transfer material according to Modification 2. FIG.

(Findings on which this disclosure is based)
The inventors of the present invention have found that the image display device described in the "Background Art" section has the following problems.

In the image display device described in Patent Document 1, a plurality of heat transfer materials having different thermal conductivities in the plane of the display panel are arranged on the back side of the display panel according to the bias of the temperature distribution of the display panel. , to eliminate unevenness in the temperature distribution of the display panel.

However, since the thermal conductivity is adjusted by changing the material used for the heat transfer material, it is necessary to prepare different materials for the number of types of heat transfer material with different thermal conductivities. .

In addition, there are individual differences in the unevenness of the temperature distribution of the display panels. Due to the need to adjust, it is necessary to change the shape or size of the heat transfer material with different thermal conductivities.

Accordingly, the present disclosure provides an image display device that can easily eliminate the uneven temperature distribution of the display panel.

An image display device according to an aspect of the present disclosure includes a self-luminous display panel that displays an image on the front surface, and a heat transfer material that is disposed in contact with the back surface of the display panel and has thermal conductivity. The heat transfer material has a plurality of holes provided on a surface in contact with the display panel, and the plurality of holes face a high-temperature region of the display panel having a relatively high temperature. The contact area in contact with the display panel per unit area of the first portion of the heat transfer material is the unit area of the second portion of the heat transfer material facing the low temperature region where the temperature of the display panel is relatively low. It is provided on the surface of the heat transfer material so as to be larger than the contact area in contact with the display panel at the perimeter.

According to this, by providing a plurality of holes in the heat transfer material, the contact area per unit area of the first portion in contact with the high temperature region of the display panel is made larger than that of the second portion in contact with the low temperature region. This makes the heat dissipation in the high temperature region greater than in the low temperature region. Therefore, by simply forming a plurality of holes in the heat transfer material, unevenness in the temperature distribution of the display panel can be easily eliminated.

Further, when the surface is viewed in plan, the opening areas of the plurality of holes are equal to each other, and the number per unit area of the plurality of holes in the first portion is the unit of the plurality of holes in the second portion. It may be less than the number per area.

Therefore, the contact area per unit area can be easily adjusted.

Further, the plurality of holes may have the same shape and size when viewed from above.

Therefore, the contact area per unit area can be easily adjusted.

Further, a chassis member that supports the display panel and the heat transfer material on the back side, and a control board that is provided on the chassis member and controls driving of the display panel, wherein the first portion is , a third portion of the heat transfer material facing the control board.

Therefore, it is possible to reduce the influence of heat generated from the control board.

Further, each of the plurality of holes penetrates the heat transfer material in the thickness direction, and the image display device further fills the plurality of holes to separate the display panel and the chassis member. An adhesive may be provided to bond them together.

Therefore, the display panel and the chassis member can be firmly joined together.

Further, a chassis member that supports the display panel and the heat transfer material on the back side is provided, and each of the plurality of holes penetrates the heat transfer material in a thickness direction, and the image display device is Further, an adhesive filling the plurality of holes and bonding the display panel and the chassis member to each other may be provided.

Therefore, the display panel and the chassis member can be firmly joined together.

Hereinafter, embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed description than necessary may be omitted. For example, detailed descriptions of well-known matters and redundant descriptions of substantially the same configurations may be omitted. This is to avoid unnecessary verbosity in the following description and to facilitate understanding by those skilled in the art.

It should be noted that the inventors provide the accompanying drawings and the following description for a full understanding of the present disclosure by those skilled in the art and are not intended to limit the claimed subject matter thereby. .

(Embodiment)
[1. Constitution]
An image display device according to an embodiment is a display device including a self-luminous display panel.

FIG. 1 is a diagram showing an example of the appearance of an image display device according to an embodiment. As shown in FIG. 1, the image display device 100 has the appearance of a general flat panel display in which the display panel is housed in a housing with an open front. In the following description, the surface of the image display device 100 and each component facing the user is called the front surface, and the opposite surface is called the rear surface. As shown in FIG. 1, the front-rear direction of the image display device 100 is the X-axis direction, the horizontal direction of the display surface is the Y-axis direction, and the vertical direction of the display surface is the Z-axis direction. Note that the image display device 100 does not necessarily have to include a housing.

FIG. 2 is a cross-sectional view of the configuration of the image display device according to the embodiment, excluding the housing. FIG. 3 is an enlarged view of area A1 in FIG. FIG. 4 is a schematic diagram of a temperature distribution generated in a light-emitting display panel according to the embodiment. FIG. 5 is a plan view of the heat transfer material according to the embodiment.

The image display device 100 includes a display panel 10, a heat transfer member 20, and a chassis member 30, as shown in FIG. The image display device 100 may further include a housing. The image display device 100 is configured by stacking a display panel 10, a heat transfer member 20, and a chassis member 30 in this order from the front side.

The display panel 10 is a self-luminous display panel that displays an image on its front surface. The display panel 10 specifically has a plurality of self-luminous elements arranged on the surface. The display panel 10 has, for example, a rectangular shape. Each light emitting element of the display panel 10 generates heat when emitting light by itself. Since the display panel 10 has higher heat dissipation in the end regions of the display surface than in the central region, the temperature distribution is uneven within the display surface. Therefore, the display panel 10 has a relatively high temperature region R11 and a relatively low temperature region R11 in a light emitting state (that is, a driving state) as shown in FIG. A region R12 is generated. The display panel 10 is, for example, an OLED (Organic Light Emitting Diode) panel. The display panel 10 is not limited to an OLED panel as long as it is a self-luminous display panel.

The heat transfer material 20 is arranged in contact with the back surface of the display panel 10 and is a member having thermal conductivity. The heat transfer material 20 has a first portion 21 facing the high temperature region R11 of the display panel 10 and a second portion 22 facing the low temperature region R12 of the display panel. The heat transfer material 20 covers the entire rear surface of the display panel 10 and has the same shape as the display panel 10 in plan view.

3 and 5, the heat transfer material 20 has a plurality of holes 23 penetrating the heat transfer material 20 in the thickness direction. These holes 23 have a contact area with the display panel 10 per unit area of the first portion 21 larger than a contact area with the display panel 10 per unit area of the second portion 22 . It is provided on the surface of the heat transfer material 20 so as to be large.

For example, as shown in FIG. 5, the opening areas of the plurality of holes 23 when the heat transfer material 20 is viewed from above may be equal to each other. Further, the shapes and sizes of the plurality of holes 23 may be the same when the heat transfer material 20 is viewed from above. The shapes and sizes of the plurality of holes 23 when the heat transfer material 20 is viewed from above may be different from each other as long as the opening areas are equal to each other. In this case, the number per unit area of the plurality of holes 23 in the first portion 21 may be less than the number per unit area of the plurality of holes in the second portion 22 . Therefore, the contact area per unit area can be easily adjusted.

Further, for example, when the heat transfer material 20 is viewed in plan, the opening area of each of the plurality of holes 23 may be different between the holes provided in the first portion 21 and the holes provided in the second portion 22. good. For example, the opening area of the hole provided in the first portion 21 may be smaller than the opening area of the hole provided in the second portion 22 . In this case, the number of holes per unit area in the first portion 21 may be equal to the number of holes per unit area in the second portion 22 . Therefore, the contact area per unit area can be easily adjusted.

The heat transfer material 20 has a plurality of holes so that the first portion 21 and the second portion 22 of one heat transfer material 20 have different contact areas per unit area with the display panel 10 . 23 may be provided. The heat transfer material 20 includes a first heat transfer material provided with a plurality of holes 23 so that the contact area per unit area has a first value, and a heat transfer material separate from the first heat transfer material. It may be composed of a combination with a second heat transfer material provided with a plurality of holes 23 so that the contact area per unit area has a second value.

The heat transfer material 20 is made of, for example, a material having higher thermal conductivity than resin. The heat transfer material 20 is made of, for example, a heat conductive sheet (about 1 to 10 W/mK) of low-altitude solid silicone rubber or the like.

Alternatively, the heat transfer material 20 may be attached to the display panel 10 by the following procedure. For example, while the display panel 10 to be attached is being driven, the temperature distribution of the display panel is measured, and the high temperature region R11 and the low temperature region R12 of the display panel 10 are specified according to the measured temperature distribution. A contact area per unit area is set according to the identified high temperature region R11, and a contact area per unit area is set according to the first portion 21 facing the high temperature region R11 and the low temperature region R12, and the low temperature A heat transfer material 20 having a second portion 22 facing the region R12 is manufactured. Then, the heat transfer material 20 manufactured on the display panel 10 is attached to the regions R11, R12 and the portions 21, 22 by aligning them.

The chassis member 30 is a member that supports the display panel 10 and the heat transfer material 20 on the back side. The chassis member 30 is, for example, a plate-like metal member.

[2. effects, etc.]
The image display device 100 according to the present embodiment includes a self-luminous display panel 10 that displays an image on the front surface, and a heat transfer material 20 that is disposed in contact with the rear surface of the display panel 10 and has thermal conductivity. , provided. The heat transfer material 20 has a plurality of holes 23 provided on the surface in contact with the display panel 10 . The plurality of holes 23 are arranged such that the contact area in contact with the display panel 10 per unit area of the first portion 21 of the heat transfer material 20 facing the high-temperature region R11 where the temperature of the display panel 10 is relatively high is the same as that of the display panel 10. The temperature of the heat transfer material 20 is larger than the contact area per unit area of the second portion 22 of the heat transfer material 20 that is in contact with the display panel 10 and faces the low temperature region R12 where the temperature of the heat transfer material 20 is relatively low. It is provided on the surface (front surface).

According to this, by providing a plurality of holes 23 in the heat transfer material 20, the first portion 21 in contact with the high temperature region R11 of the display panel 10 has a higher per unit area than the second portion 22 in contact with the low temperature region R12. contact area is increased, thereby making the heat dissipation in the high temperature region R11 greater than that in the low temperature region R12. Therefore, by simply forming a plurality of holes 23 in the heat transfer material 20 , unevenness in the temperature distribution of the display panel 10 can be easily eliminated.

[3. Modification]
(Modification 1)
In the image display device 100 according to the above embodiment, the plurality of holes 23 formed in the heat transfer material 20 are empty spaces, but the present invention is not limited to this.

FIG. 6 is an enlarged view of an area corresponding to the area A1 in FIG. 2 of the image display device according to Modification 1. As shown in FIG.

As shown in FIG. 6, in the image display device 100a according to Modification 1, a plurality of holes 23 provided in the heat transfer material 20 are filled, and the display panel 10 and the chassis member 30 are joined to each other. An adhesive 24 may also be provided. Note that the adhesive 24 is made of a material having a lower thermal conductivity than the heat transfer material 20 . Since each of the plurality of holes 23 penetrates the heat transfer material 20 in the thickness direction, the adhesive 24 filled in the plurality of holes 23 is in contact with both the display panel 10 and the chassis member 30. state. Therefore, the display panel 10 and the chassis member 30 can be firmly joined.

(Modification 2)
In the image display device 100 according to the above embodiment, the control board for controlling the driving of the display panel 10 is not taken into consideration. In other words, the image display device 100 has a configuration including an external control board. The image display device 100b according to Modification 2 further includes a control board 40 . Further, the image display device 100b differs in the configuration of the heat transfer material 120 from the image display device 100 according to the embodiment.

FIG. 7 is a cross-sectional view of the configuration of the image display device according to Modification 2, excluding the housing. FIG. 8 is a diagram showing an outline of the temperature distribution occurring in the display panel according to Modification 2. As shown in FIG. 9 is a plan view of a heat transfer material according to Modification 2. FIG. Areas 41 and 42 surrounded by dashed lines in FIGS. 8 and 9 indicate the positions where the control board 40 faces the display panel 10 and the heat transfer material 20, respectively.

The control board 40 is provided on the rear surface of the chassis member 30 and controls driving of the display panel 10 . The control board 40 generates heat while controlling the driving of the display panel 10 . Therefore, in the image display device 100b, the display panel 10 and the control board 40 generate heat while the display panel 10 is displaying an image. That is, as described in the embodiment, in addition to the temperature distribution of the display panel 10 alone, the region R23 facing the control board 40 has a higher temperature than the other regions. Therefore, the display panel 10 has a high temperature region R21 with a relatively high temperature and a low temperature region with a relatively low temperature, as shown in FIG. and R22. The high temperature region R21 is a region including the high temperature region R11 and the region R23, and the low temperature region R22 is a region excluding the high temperature region R11 and excluding the region R23.

As shown in FIG. 9, the heat transfer material 120 has a first portion 121 facing the high temperature region R21 of the display panel 10 and a second portion 22 facing the low temperature region R22 of the display panel. As described above, the high temperature region R21 is a region including the high temperature region R11 and the region R23 in the display panel 10 alone according to the embodiment. It includes a third portion 124 of the heat transfer material 120 that faces it.

The first portion 121 is formed with a plurality of holes 123 so that the contact area with the display panel 10 per unit area is the same as that of the first portion 21 according to the embodiment. In addition, the second portion 122 is formed with a plurality of holes 123 so that the contact area with the display panel 10 per unit area is the same as that of the second portion 22 according to the embodiment.

Thus, the image display device 100b according to Modification 2 further includes a chassis member 30 that supports the display panel 10 and the heat transfer material 120 on the back side, and a chassis member 30 provided in the chassis member 30 to drive the display panel 10. and a control board 40 for controlling. The first portion 21 includes a third portion 124 of the heat transfer material 120 facing the control board 40 . Therefore, it is possible to reduce the influence of heat generated from the control board.

In the image display device 100b according to Modification 2, as in Modification 1, the plurality of holes 123 of the heat transfer material 120 may be filled with an adhesive for joining the display panel 10 and the chassis member 30. .

(Modification 3)
In the image display devices 100, 100a, and 100b according to the above embodiment and Modifications 1 and 2, the heat transfer materials 20 and 120 have a unit area between them and the display panel 10 so as to correspond to the two-stage temperature distribution. Although the two types of first portions 21, 121 and second portions 22, 122 with two different contact areas per unit area are used, the contact area per unit area is not limited to two steps, and the contact area per unit area may be different in three or more steps. may be used.

(Modification 4)
Although the image display apparatuses 100, 100a, and 100b according to the above embodiment and modified examples 1 and 2 are configured to include the chassis member 30, the chassis member 30 may not be included.

(Modification 5)
In the image display devices 100, 100a, and 100b according to the above embodiment and Modifications 1 and 2, the plurality of holes 23 and 123 provided in the heat transfer materials 20 and 120 pass through the heat transfer materials 20 and 120 in the thickness direction. However, it does not have to be penetrating, as long as it is provided on the surfaces of the heat transfer members 20 and 120 that are in contact with the display panel 10 . Also, in this case, the plurality of holes may have an elongated shape like a groove.

Although the image display devices according to some aspects of the present disclosure have been described above based on the embodiments, the present disclosure is not limited to these embodiments. As long as it does not depart from the gist of the present disclosure, various modifications that can be made by those skilled in the art are applied to the present embodiment, and forms constructed by combining the components of different embodiments are included in the scope of the present invention. may

INDUSTRIAL APPLICABILITY The present disclosure is useful as an image display device that can easily eliminate unevenness in temperature distribution of a display panel.

REFERENCE SIGNS LIST 10 display panel 20 heat transfer material 21, 121 first portion 22, 122 second portion 23, 123 hole 24 adhesive 30 chassis member 40 control board 41, 42 region 100 image display device 124 third portion A1 regions R11, R21 high temperature Regions R12, R22 Low temperature region R23 region

Claims (6)

a self-luminous display panel that displays an image on the front;
a thermally conductive heat transfer material disposed in contact with the back surface of the display panel;
The heat transfer material has a plurality of holes provided on a surface in contact with the display panel,
In the plurality of holes, the contact area in contact with the display panel per unit area of the first portion of the heat transfer material facing a high-temperature region where the temperature of the display panel is relatively high is the same as that of the display panel. provided on the surface of the heat transfer material so as to be larger than the contact area per unit area of the second portion of the heat transfer material, which is in contact with the display panel, facing the low-temperature region having a relatively low temperature image display device. opening areas of the plurality of holes when viewed from above the surface are equal to each other;
The image display device according to claim 1, wherein the number per unit area of the plurality of holes in the first portion is smaller than the number per unit area of the plurality of holes in the second portion. The image display device according to claim 1, wherein the plurality of holes have the same shape and size when the surface is viewed in plan. moreover,
a chassis member that supports the display panel and the heat transfer material on the back side;
a control board provided on the chassis member for controlling driving of the display panel;
The image display device according to any one of claims 1 to 3, wherein the first portion includes a third portion of the heat transfer material facing the control board. Each of the plurality of holes penetrates the heat transfer material in the thickness direction,
5. The image display device according to claim 4, further comprising an adhesive that fills the plurality of holes and bonds the display panel and the chassis member to each other. moreover,
A chassis member that supports the display panel and the heat transfer material on the back side,
Each of the plurality of holes penetrates the heat transfer material in the thickness direction,
4. The image according to any one of claims 1 to 3, wherein the image display device further comprises an adhesive filling the plurality of holes and bonding the display panel and the chassis member to each other. display device.

Images