JP7415083B2 - display device - Google Patents

Description

The present disclosure relates to a display device.

Some display devices use a combination of adhesive and double-sided tape to fix a protective member of a liquid crystal display to a housing. A liquid crystal display is composed of a display panel and a protective member. The protective member covers and protects the display surface of the display panel. Such a display device is disclosed in Patent Document 1, for example.

Japanese Patent Application Publication No. 2013-258653

Here, in the display device disclosed in Patent Document 1, when the material of the casing and the material of the protective member are different from each other, a difference in linear expansion occurs between them. In this way, if a linear expansion difference occurs between the housing and the protective member, there is a risk that the housing or the liquid crystal display will warp.

The present disclosure has been made in order to solve the above-mentioned problems, and provides a display device that can suppress warpage caused by a difference in linear expansion between a housing and a protective member adhesively fixed thereto. The purpose is to

A display device according to the present disclosure includes a casing and a protective member that is provided on a display surface of a display panel and has a non-contact area that does not come into contact with the display surface and is fixed to the casing via double-sided tape and adhesive. The double-sided tape is applied along the lateral direction of the casing , and the adhesive is applied along the longitudinal direction of the casing .

According to the present disclosure, it is possible to suppress warpage caused by a difference in linear expansion between the housing and the protective member adhesively fixed thereto.

1 is a front view showing the configuration of a display device according to Embodiment 1. FIG. 2 is a sectional view taken along the line II-II in FIG. 1. FIG. FIG. 2 is a sectional view taken along the line III-III in FIG. 1; FIG. 3 is a diagram for explaining the function and effect of the display device according to the first embodiment. FIG. 4A is a cross-sectional view when a conventional display device is warped. FIG. 4B is a cross-sectional view when the display device according to Embodiment 1 is warped. It is a figure which shows the state when a double-sided tape is elastically deformed. FIG. 5A is a diagram showing a state when a thick double-sided tape is elastically deformed. FIG. 5B is a diagram showing a state when a thin double-sided tape is elastically deformed. 3 is a diagram showing the configuration of a display device according to Embodiment 2. FIG. FIG. 6A is a diagram showing the adhesive structure when the protective member of the liquid crystal module is viewed from the rear side. FIG. 6B is a diagram showing another adhesive structure when the protective member of the liquid crystal module is viewed from the rear side.

Hereinafter, in order to explain the present disclosure in more detail, embodiments for carrying out the present disclosure will be described with reference to the accompanying drawings.

Embodiment 1.
The display device according to Embodiment 1 will be described in detail using FIGS. 1 to 5.

FIG. 1 is a front view showing the configuration of a display device according to the first embodiment. FIG. 2 is a sectional view taken along the line II--II in FIG. FIG. 3 is a sectional view taken along the line III--III in FIG. 1.

The display device according to the first embodiment shown in FIGS. 1 to 3 is provided, for example, in a vehicle interior. Such a display device has an overall rectangular shape when viewed from the front (inside the vehicle interior). The display device also includes a housing 10 and a liquid crystal module 20. The liquid crystal module 20 is fixed to the housing 10 using double-sided tape 61 and adhesive 71. That is, in the display device, the liquid crystal module 20 is located at the front of the display device, and the casing 10 is located at the rear of the display device.

As shown in FIGS. 1 to 3, the housing 10 has a rectangular flat plate shape. This housing 10 is made of resin, for example. Further, the housing 10 has a flat surface 11, a short side surface 12, and a long side convex surface 13. The flat surface 11 , the short side surface 12 , and the long side convex surface 13 constitute the front surface of the housing 10 and face the rear surface of the liquid crystal module 20 .

Flat surface 11 is a flat surface. The short side surface 12 and the long side convex surface 13 are formed on the outer periphery of the flat surface 11.

The short side surfaces 12 are provided on both left and right short sides of the outer peripheral portion of the flat surface 11 . Specifically, the short side surface 12 is provided on the short side portion of the flat surface 11 so as to extend in the short side direction (short side direction) of the housing 10 . Further, the short side surface 12 is arranged at the center of the short side portion in the lateral direction. The short side surface 12 is formed flush with the flat surface 11. Note that the short side surface 12 does not have to be flush with the flat surface 11.

Further, the short side surface 12 is an area to which the double-sided tape 61 is attached. This double-sided tape 61 is attached to the entire short side surface 12. That is, the double-sided tape 61 is placed at the center of the short side in the lateral direction. The double-sided tape 61 is made of elastic resin.

The long-side convex surfaces 13 are provided on both upper and lower long sides of the outer periphery of the flat surface 11 . Specifically, the long side convex surface 13 is provided on the long side portion of the flat surface 11 so as to extend in the longitudinal direction (long side direction) of the housing 10 . Further, the long side convex surface 13 is arranged at the longitudinal center of the long side. The long side convex surface 13 projects further forward than the short side surface 12. In other words, the long-side convex surface 13 protrudes more toward the protection member 22, which will be described later, than the short-side surface 12. Note that the longitudinal direction of the casing 10 is a direction substantially perpendicular to the lateral direction of the casing 10.

Further, the long side convex surface 13 is an area where the adhesive 71 is applied. This adhesive 71 is applied to the entire long side convex surface 13 . That is, the adhesive 71 is arranged at the center in the longitudinal direction of the long side. The adhesive 71 has a higher adhesive force per adhesive area than the double-sided tape 61.

The two opposing short side surfaces 12 are arranged between the two opposing long side convex surfaces 13. For this reason, in the case 10, the long side convex surface 13 is extended as much as possible to improve the overall adhesive strength. As shown in FIG. 1, the width of the short side surface 12 is wider than the width of the long side convex surface 13, but the width of the short side surface 12 is the same as the width of the long side convex surface 13. It may be narrower than the width or the width of the long side convex surface 13.

As shown in FIGS. 1 to 3, the liquid crystal module 20 has a rectangular flat plate shape. The size of this liquid crystal module 20 is approximately the same as the size of the housing 10. Such a liquid crystal module 20 is fixed to the housing 10 using double-sided tape 61 and adhesive 71. Further, the liquid crystal module 20 includes a display panel 21 and a protection member 22.

The display panel 21 has a rectangular flat plate shape. The front surface of this display panel 21 is a display surface 21a. Images (including videos) can be displayed on the display surface 21a. Such a display panel 21 is made of glass, for example.

The protective member 22 protects the display panel 21. Moreover, the protection member 22 has a rectangular flat plate shape. This protective member 22 is formed larger than the display panel 21 and is approximately the same size as the housing 10. The display surface 21a of the display panel 21 is in contact with the center of the rear surface of the protection member 22. The protection member 22 is made of, for example, transparent glass.

The outer circumferential portion 22a on the rear surface of the protection member 22 is a non-contact area with which the display surface 21a of the display panel 21 does not come into contact. That is, the outer peripheral portion 22a serving as a non-contact area is formed in a rectangular frame shape. A black sheet is attached to the outer peripheral portion 22a or black printing is applied thereto.

The short side portion of the outer peripheral portion 22a is fixed to the short side surface 12 via double-sided tape 61. Further, the long side portion of the outer peripheral portion 22a is fixed to the long side convex surface 13 via an adhesive 71. At this time, since the double-sided tape 61 and the adhesive 71 are placed behind the black outer peripheral part 22a and are hidden behind the black outer peripheral part 22a, even if the user looks into the liquid crystal module 20, the double-sided tape 61 And the adhesive 71 is not visible.

Here, as shown in FIG. 3, the thickness of the double-sided tape 61 interposed between the short side portion of the outer peripheral portion 22a and the short side surface 12 is t1. Further, the thickness of the adhesive 71 interposed between the long side portion of the outer peripheral portion 22a and the long side convex surface 13 is t2. At this time, the thickness t1 of the double-sided tape 61 is thicker than the thickness t2 of the adhesive 71. Note that the thickness t2 of the adhesive 71 is the thickness of the adhesive 71 after it is cured.

Since the double-sided tape 61 is an elastic body, the thicker the double-sided tape 61, the more the double-sided tape 61 itself deforms. As a result, the double-sided tape 61 absorbs the difference in linear expansion between the housing 10 and the protective member 22 and suppresses warping of the housing 10 or the protective member 22. On the other hand, generally speaking, the thinner the adhesive, the higher the adhesive strength. Therefore, by reducing the thickness t2 of the adhesive 71, the adhesive strength for adhesively fixing the liquid crystal module 20 to the housing 10 is improved. Therefore, the display device according to the first embodiment absorbs the linear expansion difference between the casing 10 and the protective member 22 and suppresses warping of the casing 10 and the protective member 22. Alternatively, peeling from the protective member 22 can be suppressed.

As shown in FIGS. 1 and 3, gaps are formed between the ends of the double-sided tape 61 and the adhesive 71 at the four corners of the display device. The end portion and the end portion of the adhesive 71 may be connected.

Next, the effects of the display device according to Embodiment 1 will be explained using FIGS. 4 and 5 while describing problems with the conventional display device.

FIG. 4 is a diagram for explaining the effects of the display device according to the first embodiment. FIG. 5 is a diagram showing a state when the double-sided tape 61 is elastically deformed. The arrow D1 shown in FIGS. 4A to 5B indicates the direction of linear expansion of the casing 10, and its length indicates the amount of linear expansion of the casing 10. Further, the arrow D2 indicates the linear expansion direction of the liquid crystal module 20, and its length indicates the amount of linear expansion of the liquid crystal module 20. Further, an arrow D3 shown in FIG. 4A indicates a direction in which the housing 10 is warped toward the outside of the device.

Here, in the display device, if the material of the casing 10 and the material of the liquid crystal module 20 are different from each other, there is a possibility that warping may occur in the longitudinal direction of the display device due to the difference in linear expansion between them. For example, if the material of the casing 10 is resin and the material of the liquid crystal module 20 is glass, the linear expansion coefficient of the resin is larger than that of glass, so the casing 10 is larger than the liquid crystal module 20. Easy to linear expansion.

The conventional display device shown in FIG. 4A has a structure in which a liquid crystal module 20 is fixed to a housing 10 using only an adhesive 71. The thickness of the adhesive 71 extending in the transverse direction and the thickness of the adhesive 71 extending in the longitudinal direction are approximately the same thickness. Note that in FIG. 4A, the adhesive 71 extending in the longitudinal direction of the display device is omitted.

As shown in FIG. 4A, for example, when the interior of the vehicle becomes high temperature and the conventional display device is also kept at a high temperature, the case 10 is fixed to the housing 10 using an adhesive 71. Both the liquid crystal module 20 and the liquid crystal module 20 undergo thermal expansion (thermal deformation).

At this time, the adhesive 71 extending in the transverse direction has lower elasticity than the double-sided tape 61, so it cannot withstand the difference between the amount of linear expansion of the casing 10 and the amount of linear expansion of the liquid crystal module 20. . That is, the adhesive 71 extending in the lateral direction cannot absorb the difference in linear expansion therebetween. As a result, there is a possibility that warpage D3 may occur in the case 10 having a larger coefficient of linear expansion between the case 10 and the liquid crystal module 20. This warpage D3 is a deformation in which the longitudinal center portion of the housing 10 bulges toward the outside of the device.

On the other hand, as shown in FIG. 4B, for example, when the interior of the vehicle becomes high temperature and the display device according to the first embodiment is also maintained at a high temperature, the casing 10 and The liquid crystal module 20 fixed using the double-sided tape 61 and the adhesive 71 both thermally expand. Note that in FIG. 4B, the adhesive 71 extending in the longitudinal direction of the display device is omitted.

At this time, since the double-sided tape 61 extending in the transverse direction has higher elasticity than the adhesive 71, it can withstand the difference between the amount of linear expansion of the casing 10 and the amount of linear expansion of the liquid crystal module 20. . That is, the double-sided tape 61 extending in the transverse direction can absorb the difference in linear expansion therebetween. As a result, the display device according to the first embodiment can suppress warping that occurs in the case 10, which has a larger coefficient of linear expansion, of the case 10 and the liquid crystal module 20.

Therefore, the display device according to Embodiment 1 uses the elasticity of the double-sided tape 61 to absorb the linear expansion difference between the housing 10 and the liquid crystal module 20, thereby preventing warpage in the longitudinal direction of the housing 10. can be suppressed. At this time, in the display device, by using the double-sided tape 61, there is a possibility that the adhesive force between the housing 10 and the liquid crystal module 20 may be reduced. Therefore, in the display device, the adhesive force is improved by using the adhesive 71 extending in the longitudinal direction to compensate for the decrease in adhesive force by using the double-sided tape 61.

Furthermore, as shown in FIG. 5A, since the double-sided tape 61 has a thicker thickness, the amount of elastic deformation is larger than when the thickness is thinner, as shown in FIG. 5B, and the line This is advantageous for absorbing expansion differences.

As described above, in the display device according to the first embodiment, the non-contact area that is provided on the housing 10 and the display surface 21a of the display panel 21 and does not come into contact with the display surface 21a is provided through the double-sided tape 61 and the adhesive 71. A protective member 22 is fixed to the housing 10, and the double-sided tape 61 is applied along the transverse direction, and the adhesive 71 is applied along the longitudinal direction. Therefore, the display device can suppress warpage caused by the difference in linear expansion between the housing 10 and the protective member 22 adhesively fixed thereto.

Further, in the display device, the thickness t1 of the double-sided tape 61 is thicker than the thickness t2 of the adhesive 71. Therefore, in the display device, since the amount of elastic deformation of the double-sided tape 61 can be increased, even if a large linear expansion difference occurs between the housing 10 and the protective member 22, the linear expansion difference can be suppressed. Can be absorbed.

Embodiment 2.
A display device according to Embodiment 2 will be described using FIG. 6.

FIG. 6 is a diagram showing the configuration of a display device according to the second embodiment. Note that components having the same functions as those described in Embodiment 1 are denoted by the same reference numerals, and the description thereof will be omitted.

The display device according to the second embodiment has an elliptical shape as a whole when viewed from the front of the display device. Therefore, as shown in FIG. 6A, the protection member 23 has an oval shape when viewed from the rear side. On the other hand, the short side surface 12 and the long side convex surface 13 (not shown) of the housing 10 are curved along the outer peripheral part 23a of the protection member 23. A double-sided tape 61 is attached to the short side surface 12. An adhesive 71 is applied to the long side convex surface 13. Therefore, in the display device, the difference in linear expansion in the longitudinal direction (major axis direction) can be absorbed by the double-sided tape 61 attached to the short side surface 12. Therefore, the display device can suppress warping in the longitudinal direction.

Further, as shown in FIG. 6B, the housing 10 may include a short side surface 12 (not shown) that is linear. This short side surface 12 extends in a direction perpendicular to the longitudinal direction. An adhesive 71 is applied to the short side surface 12 .

As described above, in the display device according to the second embodiment, the non-contact area that is provided on the housing 10 and the display surface 21a of the display panel 21 and does not come into contact with the display surface 21a is provided through the double-sided tape 61 and the adhesive 71. The protective member 23 is fixed to the housing 10, the double-sided tape 61 is applied along the width direction, and the adhesive 71 is applied along the length direction. Therefore, the display device can suppress warping caused by the difference in linear expansion between the housing 10 and the protective member 23 adhesively fixed thereto.

Note that within the scope of the present disclosure, each embodiment can be freely combined, any component of each embodiment can be modified, or any component can be omitted from each embodiment. .

The display device according to the present disclosure suppresses warping due to the difference in linear expansion between the casing and the protective member by pasting double-sided tape along the transverse direction and applying adhesive along the longitudinal direction. This makes it suitable for use in display devices, etc.

Reference Signs List 10 housing, 11 flat surface, 12 short side surface, 13 long side convex surface, 20 liquid crystal module, 21 display panel, 21a display surface, 22, 23 protective member, 22a, 23a outer periphery, 61 double-sided tape, 71 adhesive.

Claims (2)

A casing and
A non-contact area provided on the display surface of the display panel and not in contact with the display surface is provided with a protective member fixed to the casing via double-sided tape and adhesive,
The double-sided tape is attached along the short direction of the housing ,
The display device is characterized in that the adhesive is applied along the longitudinal direction of the housing . The casing is
a short side of a flat surface constituting the front surface of the casing, the short side extending in the lateral direction of the casing, and to which the double-sided tape is attached;
a long side convex surface provided on a long side of the flat surface to extend in the longitudinal direction of the casing, protruding toward the protective member side from the short side, and to which the adhesive is applied; has
The display device according to claim 1, wherein the double-sided tape is thicker than the adhesive.

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