WO2022004824A1

WO2022004824A1 - Liquid crystal display device

Info

Publication number: WO2022004824A1
Application number: PCT/JP2021/024856
Authority: WO
Inventors: 雄三大土井
Original assignee: 三菱電機株式会社
Priority date: 2020-07-01
Filing date: 2021-06-30
Publication date: 2022-01-06
Also published as: TW202202908A

Abstract

In liquid crystal display devices including a liquid crystal panel, a housing accommodating the liquid crystal panel, and a protective sheet that is joined at the front surface of the liquid crystal panel, and in which the rear surface of the protective sheet and the housing are joined at an outer peripheral portion of the liquid crystal panel, a resilient body disposed in a gap between the protective sheet and the housing may impart stress to the liquid crystal panel. This stress has an adverse effect on the display quality. According to the present invention, a resilient body which is capable of deforming to at least the maximum value of a gap generated as a result of the difference between the degrees of parallelism of the protective sheet and the housing is disposed between the protective sheet and the housing, in a joint portion, and the gap is filled by the resilient body. As a result, a repulsive force imparted to the protective sheet can be reduced, and a deterioration in the display quality of the liquid crystal panel can be suppressed.

Description

Liquid crystal display device

This disclosure relates to a liquid crystal display device. The present disclosure particularly relates to a liquid crystal display device having a liquid crystal panel, a housing (rear frame) for accommodating the liquid crystal panel, and a protective plate (cover panel) joined to the front surface of the liquid crystal panel.

The liquid crystal display device can be easily made thinner and consume less power, and can be applied to a wide range of display screen sizes from small to large. It is used in a wide range of applications such as televisions, computers, mobile terminals, in-vehicle and industrial displays. A liquid crystal display device normally electrically controls the orientation direction of liquid crystal sandwiched between a pair of transparent substrates which are liquid crystal panels, and adjusts the amount of light supplied from a rear light source (backlight). Display by.

In particular, in the fields of mobile terminals, in-vehicle use, and industrial use, a technology for adhering a protective plate made of translucent glass, resin, etc. to the front surface of a liquid crystal panel has been developed. Further, input / output functional elements such as a touch panel and an acoustic plate may be arranged between the protective plate and the liquid crystal panel (see, for example,

Patent Documents

1, 2 and 3).

Japanese Unexamined Patent Publication No. 2008-90053 Japanese Unexamined Patent Publication No. 2010-9966 Japanese Unexamined Patent Publication No. 2012-68431

However, in a liquid crystal display device having a liquid crystal panel, a housing for accommodating the liquid crystal panel, and a protective plate joined at the front surface of the liquid crystal panel, and the back surface of the protective plate and the housing are joined at the outer peripheral portion of the liquid crystal panel. , The following problems occur.

If the parallelism of the joint between the protective plate and the housing is different and the size of the gap between the protective plate and the housing is different depending on the joint position between the protective plate and the housing, double-sided tape, adhesive, screws, etc. At the joining position where the gap between the protective plate and the housing is large, the protective plate with weaker rigidity is deformed. As a result, the influence of stress due to the deformation may affect the liquid crystal panel bonded to the protective plate, causing uneven brightness of the display screen or light omission during black display, resulting in deterioration of display quality. ..

This disclosure is made in order to solve the above-mentioned problems. When the protective plate and the housing are joined, the parallelism of the joining surfaces is poor, and even if the size of the gap differs depending on the joining position, the joining is performed. Provided is a liquid crystal display device in which there is almost no deformation of the protective plate even after that, and there is almost no deterioration in display quality such as uneven brightness of the display screen when displaying the liquid crystal panel joined to the protective plate or light omission during black display. The purpose is.

The liquid crystal display device according to the present disclosure includes a liquid crystal panel, a housing for accommodating the liquid crystal panel, and a protective plate joined at the front surface of the liquid crystal panel, and the protective plate and the housing are the same. An elastic body that is joined at a joint located on the outer periphery of the liquid crystal panel and deforms to a maximum value or more of the gap amount that differs depending on the position of the joint in the gap created by the difference in parallelism between the protective plate and the housing. , The protective plate is arranged between the protective plate and the housing, the gap is filled with the elastic body, and the protective plate is joined to the housing without being deformed.

According to the configuration of the present disclosure, when the protective plate and the housing are joined, the parallelism of the joint surface is poor, and even if the size of the gap differs depending on the position, the protective plate is hardly deformed and is joined to the protective plate. It is possible to obtain a liquid crystal display device having almost no deterioration in display quality such as uneven brightness of the display screen of the liquid crystal panel or light omission during black display.

It is a front view of the liquid crystal display device of this disclosure. FIG. 3 is a sectional view taken along line AA of the liquid crystal display device according to the first embodiment of the present disclosure. FIG. 3 is a sectional view taken along line BB of the liquid crystal display device according to the first embodiment of the present disclosure. FIG. 5 is a sectional view taken along line AA of the liquid crystal display device according to the second embodiment of the present disclosure. FIG. 3 is a sectional view taken along line AA of the liquid crystal display device according to the third embodiment of the present disclosure. FIG. 5 is a sectional view taken along line AA of the liquid crystal display device according to the fourth embodiment of the present disclosure. It is a front view of the liquid crystal display device which concerns on Embodiment 5 of this disclosure. FIG. 5 is a sectional view taken along line AA of the liquid crystal display device according to the fifth embodiment of the present disclosure. FIG. 5 is a sectional view taken along line BB of the liquid crystal display device according to the fifth embodiment of the present disclosure. FIG. 5 is a sectional view taken along line BB of an elastic body before joining of the liquid crystal display device according to the fifth embodiment of the present disclosure.

<Embodiment 1>
Hereinafter, Embodiment 1 of the present disclosure will be described with reference to the drawings. FIG. 1 is a front view of the liquid crystal display device 100 of the present disclosure. FIG. 2 is a cross-sectional view taken along the line AA of FIG. FIG. 3 is a cross-sectional view taken along the line BB of FIG.

In the liquid crystal display device 100 of the present disclosure, the protective plate 1 is on the outermost surface, and the liquid crystal panel 2 is joined to each other on the back surface of the protective plate 1 via a transparent adhesive member 6. The display screen 2a of the liquid crystal panel 2 can be visually recognized from the surface of the protective plate 1. The display screen 2a is slightly smaller than the size of the liquid crystal panel 2 because the outer peripheral portion of the liquid crystal panel 2 has a mounting portion, a terminal portion for connecting to an external circuit, and the like (not shown).

The liquid crystal panel 2 is joined to the back surface of the protective plate 1, and the housing 4 having an opening so as to surround the liquid crystal panel 2 also has a protective plate via the elastic body 3 including the

elastic bodies

3a and 3b. It is joined to the back surface of 1. The housing 4 is made of plastic or metal having an opening for accommodating the liquid crystal panel 2, the rear light source 90, and the like. In the figure, the housing 4 is joined to the back surface of the protective plate 1 at a joint portion located on the outer peripheral portion of the liquid crystal panel 2. More specifically, the housing 4 is joined to the back surface of the protective plate 1 in a frame-shaped region that surrounds the liquid crystal panel 2. The elastic body 3 is arranged in the frame-shaped region. Although the elastic body 3 has a frame-like shape, it may be divided into a plurality of shapes (for example, a straight line for each of the four sides).

Although the details of the liquid crystal panel 2 are not shown, the array substrate on which the wiring and electrodes are formed and the facing substrate on which the color filter and the like are formed are arranged in parallel and bonded to each other. Further, a liquid crystal display is enclosed between the array substrate and the facing substrate. A polarizing plate is attached to the outer surface side of the array substrate and the facing substrate, respectively. Therefore, when the liquid crystal panel 2 is illustrated in detail, it has a laminated structure including a polarizing plate, a facing substrate, a liquid crystal display, an array substrate, and a polarizing plate.

The display screen 2a (display area) of the liquid crystal panel 2 is composed of a large number of pixels. An image of the display device is formed by applying a signal corresponding to the display image to each pixel of the display screen 2a (display area). Further, a rear light source 90 is provided on the back surface of the liquid crystal panel 2, and the displayed image is visually recognized by the observer by irradiating light from the back surface.

In FIG. 2, the configuration in which the rear light source 90 is attached to the liquid crystal panel 2 is shown, but the rear light source 90 may be configured to be attached in the opening of the housing 4, and the liquid crystal in the liquid crystal display device 100 may be used. Other positions may be used as long as the configuration is provided on the back surface of the panel 2.

Although not shown, a terminal or an opening for wiring for supplying power or a signal to the liquid crystal panel 2 and the rear light source 90 is provided on a part of the side surface or the back surface of the housing 4.

Next, the structure in which the protective plate 1 and the housing 4 are joined via the elastic body 3 will be described in detail with reference to FIGS. 2 and 3. 2 and 3 show a structure in which the

adhesive members

51 and 52 such as double-sided tape or an adhesive and the elastic body 3 fill the gap between the protective plate 1 and the housing 4, but FIG. 2 and FIG. The size of the gap between the protective plate 1 and the housing 4 differs between the left side and the right side of FIG. This is caused by the difference in parallelism between the protective plate 1 and the housing 4. Hereinafter, when expressing the size of the gap, the expression of the gap amount may be used.

In FIGS. 2 and 3, the gap amount is small on the left side and large on the right side. Specifically, the thickness of the elastic body 3a shown on the left side in FIGS. 2 and 3 is thinner than the thickness of the elastic body 3b shown on the right side. This difference occurs because the parallelism between the protective plate 1 and the housing 4 differs between the left side and the right side as shown in FIG. 3, and the amount of gap between the two differs depending on the position.

The elastic body 3 has a certain thickness before joining the protective plate 1 and the housing 4. However, after the protective plate 1 and the housing 4 are joined, the elastic body 3 is deformed (shrinked) according to a different gap amount for each position so as to fill the gap between the protective plate 1 and the housing 4. At that time, since the amount of gap and the amount of deformation differ depending on the position, the thicknesses of the

elastic bodies

3a and 3b are different. That is, the elastic body 3a at the position where the gap is small is thinner than the elastic body 3b at the position where the gap is large.

Here, the joint surface between the elastic body 3 and the protective plate 1 and the joint surface between the elastic body 3 and the housing 4 are joined via

adhesive members

51 and 52 such as double-sided tape or an adhesive, respectively. .. Since the

adhesive members

51 and 52 are much thinner than the elastic body 3, the left and right thicknesses do not differ significantly between FIGS. 2 and 3 as in the

elastic bodies

3a and 3b.

The elastic body 3 is made of a material and a thickness that can be deformed (shrinked) to or more than the maximum value of the gap amount due to the joint position between the protective plate 1 and the housing 4 caused by the difference in parallelism between the protective plate 1 and the housing 4. Use the one. Further, the elastic body 3 is preferably made of a material having a property different from the property of having a good sealing property and a large restoring force to return to the original thickness as used for a normal O-ring, packing, gasket or the like.

That is, as the elastic body 3, the restoring force that returns to the original thickness after the deformation due to the pressing stress after the joining becomes small so that the stress applied to the protective plate 1 due to the deformation due to the joining becomes as small as possible, and the pressing stress is eliminated. However, a material having a large permanent strain (elastic strain) that does not return to the original thickness is desirable.

The elastic body 3 is, for example, an elastomer, rubber, sponge, foamed styrol, urethane resin, or the like, which is deformed (shrinked) at a constant deformation (shrinkage) rate for a certain period of time, and then returns without pressing force. A material having a permanent strain ratio of 10% or more, preferably 30 to 40% or more, which indicates the ratio between the difference from the thickness and the amount of deformation (shrinkage), is desirable.

Hereinafter, the reason why a material having permanent strain (elastic strain) is desirable will be explained. At a position where the gap between the protective plate 1 and the housing 4 is small, the amount of deformation (shrinkage amount) of the elastic body 3 is also large. Here, when an elastomer, rubber, or the like used for an O-ring, packing, gasket, or the like is used as the elastic body 3, if the deformation amount (shrinkage amount) is large, the repulsive force (stress) also increases.

Generally, the protective plate 1 has a flat plate shape and is weaker in rigidity than the housing 4 having an opening. Therefore, as shown on the left side in FIGS. 2 and 3, the position where the gap between the protective plate 1 and the housing 4 becomes small is small. The amount of deformation (shrinkage amount) of the elastic body 3a is also large, and the repulsive force (stress) given by the elastic body 3 to the protective plate 1 is also large.

When the protective plate 1 is deformed by this repulsive force, it acts as a deformation stress to the liquid crystal panel 2 via the protective plate 1, and the brightness of the display screen 2a at the time of display of the liquid crystal display device 100 is uneven or black is displayed. This will cause deterioration of the display quality such as light leakage.

Here, it should be noted that the deformation stress due to the non-uniformity of the gap amount, which is the root cause, does not always occur immediately after the joint between the protective plate 1 and the housing 4. Even if the protective plate 1 is not deformed immediately after joining, if the protective plate 1 is still under deformation stress, the protective plate 1 will gradually be affected by the surrounding environment such as temperature and humidity or changes over time. When the deformation occurs, it acts as a deformation stress to the liquid crystal panel 2 via the protective plate 1, and deteriorates the display quality such as uneven brightness of the display screen 2a at the time of display of the liquid crystal display device 100 or light omission at the time of black display. Will cause. Therefore, as described above, as the elastic body 3, a material having permanent strain (elastic strain) in which the repulsive force (stress) applied to the protective plate 1 after joining the protective plate 1 and the housing 4 is small is desirable.

As described above, in the liquid crystal display device 100 according to the first embodiment, the difference in the gap amount due to the joint position due to the parallelism difference between the protective plate 1 and the housing 4 is a material that can be deformed to be more than the maximum value of the gap amount. It is corrected (absorbed) by the difference in the amount of deformation (amount of contraction) of the elastic body 3 having a thickness. Therefore, since the protective plate 1 is hardly deformed even after the protective plate 1 and the housing 4 are joined, the deformation stress due to the difference in the amount of gap between the protective plate 1 and the housing 4 does not reach the liquid crystal panel 2. , The display quality will also be maintained.

Further, if the elastic body 3 is a material having a large permanent strain (elastic strain), the repulsive force of the elastic body 3 is maintained in a small state even in a portion where the deformation (shrinkage) is large after the protective plate 1 and the housing 4 are joined. can do. Therefore, since there is almost no influence of deformation stress on the protective plate 1 or the liquid crystal panel 2, there is almost no deterioration in display quality such as uneven brightness of the display screen 2a of the liquid crystal panel 2 or light omission during black display even after joining. ..

<Embodiment 2>
FIG. 4 is a cross-sectional view of the display device according to the second embodiment of the present disclosure, and is a view corresponding to the cross-sectional view taken along the line AA of FIG. In FIGS. 2 and 3 used for explanation in the first embodiment, the elastic body 3 is exposed as it is in the gap between the protective plate 1 and the housing 4. The exposed portion does not refer to the joint surface between the elastic body 3 and the protective plate 1 or the joint surface between the elastic body 3 and the housing 4, but to the side surface portion of the elastic body 3.

When the elastic body 3 is, for example, a porous sponge, expanded polystyrene, urethane resin, etc., it is inferior to the elastomer, rubber, etc. used for O-rings, packings, gaskets, etc. in terms of moisture resistance or waterproofness. There are many. In the structure according to the second embodiment, the

members

7a and 7b, which are made of a protective tape or a resin and have excellent moisture-proof or waterproof properties, are formed in a portion where the elastic body 3 is exposed in the gap between the protective plate 1 and the housing 4. Is affixed or applied.

The lengths (widths) of the

members

7a and 7b having excellent moisture-proof or waterproof properties differ depending on the thickness of the

elastic bodies

3a and 3b exposed in the gap between the protective plate 1 and the housing 4. Alternatively, if the

members

7a and 7b having excellent moisture-proof or waterproof properties such as protective tape or resin are members that expand and contract together with the elastic body 3, they are uniform before joining the protective plate 1 and the housing 4. It may be formed by sticking or applying it to the side surface of the elastic body 3 having a thickness.

In the second embodiment,

members

7a and 7b having excellent moisture-proof or waterproof properties made of protective tape or resin are attached or applied to a portion exposed in the gap between the protective plate 1 of the elastic body 3 and the housing 4. Therefore, the moisture-proof or waterproof property of the liquid crystal display device 100 is improved as compared with the first embodiment.

<Embodiment 3>
FIG. 5 is a cross-sectional view of the display device according to the third embodiment of the present disclosure, and is a view corresponding to the cross-sectional view taken along the line AA of FIG. In FIG. 4 used for explanation in the second embodiment, a member 7a having excellent moisture-proof or waterproof properties such as a protective tape or a resin is formed in a portion exposed in the gap between the protective plate 1 of the elastic body 3 and the housing 4. 7b was pasted or applied. In the third embodiment, the exposed

members

8a and 8b having excellent moisture-proof or waterproof properties such as protective tape or resin are exposed not only in the portion of the elastic body 3 exposed in the gap between the protective plate 1 and the housing 4. Some of them are continuously attached or applied to the back surface of the protective plate 1 or the side surface of the housing 4. With such a structure, the moisture-proof property or the waterproof property of the liquid crystal display device 100 is further improved.

In the structure according to the third embodiment, the

members

8a and 8b having excellent moisture-proof or waterproof properties are attached or applied after the protective plate 1 and the housing 4 are joined. The widths (lengths) of the

members

8a and 8b having excellent moisture resistance or waterproofness may be changed according to the size of the gap between the protective plate 1 and the housing 4, and are the same regardless of the size of the gap. The width (length) may be used.

In the elastic body 3, the portion exposed in the gap between the protective plate 1 and the housing 4 is a

member

8a or 8b made of a protective tape or resin and having excellent moisture-proof or waterproof properties, and is a part of the protective plate 1 or the housing 4. And is continuously pasted or applied and covered. Further, since the side surfaces of the

adhesive members

51 and 52 are also covered with the

members

8a and 8b having excellent moisture-proof or waterproof properties, the moisture-proof or waterproof properties of the liquid crystal display device 100 according to the third embodiment can be achieved. It is further improved as compared with the first and second forms.

<Embodiment 4>
FIG. 6 is a cross-sectional view of the display device according to the fourth embodiment of the present disclosure, and is a view corresponding to the cross-sectional view taken along the line AA of FIG. In the fourth embodiment, in addition to the display devices described in the first to third embodiments, a display device in which the translucent functional element 70 is arranged between the protective plate 1 and the liquid crystal panel 2 will be described.

The translucent functional element 70 is, for example, an input element such as a sensor plate that detects capacitance, pressure, magnetic field, light or electromagnetic wave, or an output element such as an acoustic plate or a diaphragm. The translucent functional element 70 is located between the protective plate 1 and the liquid crystal panel 2, and is joined to each other by transparent adhesive members 62 and 64.

The display device according to the fourth embodiment is not limited to the space between the protective plate 1 and the liquid crystal panel 2, but is displayed on the liquid crystal display device 100 by arranging the input / output functional element 70 on the back side of the protective plate 1. Not only the function but also the input or output function can be added.

<Embodiment 5>
FIG. 7 is a front view of the liquid crystal display device 110 according to the fifth embodiment of the present disclosure. FIG. 8 is a sectional view taken along line AA of the liquid crystal display device 110 according to the fifth embodiment of FIG. 9 is a sectional view taken along line BB of the liquid crystal display device 110 according to the fifth embodiment of FIG. 7. FIG. FIG. 10 is a sectional view taken along line BB of the elastic body 30 including the

elastic bodies

30a, 30b, and 30c before joining the liquid crystal display device 110 according to the fifth embodiment of FIG.

The liquid crystal display device 110 according to the fifth embodiment has a protective plate 10 having a curved shape. The liquid crystal panel 20 and the display screen 20a joined to the protective plate 10 also have a curved shape. As described in the first embodiment, the liquid crystal panel 20 has a laminated structure including a polarizing plate, a facing substrate, a liquid crystal display, an array substrate, and a polarizing plate. The thickness of the array substrate or the facing substrate of the liquid crystal panel 20 is as thin as 0.1 to 0.4 mm so as to be curved. The rear light source 92 also has a curved shape corresponding to the liquid crystal panel 20.

Also in FIG. 7, the points that the

adhesive members

51 and 52 such as double-sided tape or adhesive and the elastic body 30 fill the gap between the protective plate 10 and the housing 40 are the same as those in the first to fourth embodiments. However, in FIG. 7, since the protective plate 10 has a curved shape, the housing 40 also has a curved shape at the position where the housing 40 is joined to the protective plate 10, which is different from the first to fourth embodiments.

The thickness of the elastic body 30 at the end portion in the curved shape shown in the cross-sectional views of FIGS. 8 and 9, which is an example for use in the explanation of the fifth embodiment, is larger than the thickness at the central portion. In addition, the gap at the end is larger on the right side than on the left side. Therefore, the thickness of the elastic body 30b on the right side is larger than the thickness of the elastic body 30a on the left side.

It is desirable that the parallelism (curvature) of the curved shape of the protective plate 10 and the housing 40 is the same at the position where the protective plate 10 and the housing 40 are joined. However, it is more difficult to make the parallelism (curvature) of the curved shape match than in the case of the planar shape.

This is because the curvature of the curved protective plate 10 is difficult to be uniform, and the amount of gap is more likely to change depending on the position than in the case of the planar shape. In addition, the amount of gaps is likely to vary or change due to changes in temperature and humidity, manufacturing variations, and the like. In particular, the amount of gap tends to vary or change significantly at the end of the curved protective plate 10.

As described above, when the repulsive force (stress) of the elastic body 30 applied to the end of the curved protective plate 10 becomes large, the stress is applied non-uniformly to the liquid crystal panel 20 and the display is defective at the end of the display screen 20a. Is easy to cause.

In order to solve this, FIG. 10, which is an example to be used in the explanation of the fifth embodiment, shows that the thickness of the elastic body 30 before joining is not uniform but is changed depending on the position. Here, by making the thickness of the elastic body 30 at the left and right ends of the protective plate 10 larger than that at the center, the repulsive force (stress) applied to the end of the protective plate 10 is absorbed and made smaller than the one having a uniform thickness. Generally, the amount of gap between the left and right ends of the protective plate 10 is large due to changes in temperature and humidity, manufacturing variations, etc., and is easily deformed. Therefore, as shown in FIG. 10, the elastic bodies 30a at the left and right ends before joining, It is preferable that the thickness of 30b is larger than the thickness of the elastic body 30c in the central portion.

Rather than making the elastic body 30 before joining uniform in thickness as described above, it is better to change the thickness according to the tendency of the gap amount that differs depending on the joining position, after joining the protective plate 10 and the housing 40. The difference in the amount of deformation (shrinkage) of the elastic body 30 depending on the joining position can be reduced. Since there is no position where the amount of deformation (contraction) of the elastic body 30 is particularly large, the repulsive force (stress) applied to the protective plate 10 can be reduced. As a result, since there is almost no influence of the deformation stress on the protective plate 10 or the liquid crystal panel 20, there is almost no deterioration in display quality such as uneven brightness of the display screen 20a of the liquid crystal panel 20 or light omission during black display even after joining. No.

The liquid crystal display device 110 according to the fifth embodiment shows a configuration in which the protective plate 10 and the display screen 20a have a convex curved shape as shown in the cross-sectional views of FIGS. 8 and 9, but the concave shape and the like are shown. A curved structure can also be applied.

Further, although the elastic body 30 has a thicker left and right end portion than the central portion, the reverse configuration in which the thickness of the left and right end portions is smaller than the central portion can also be applied.

Further, also in the fifth embodiment of the present disclosure, a material having permanent strain (elastic strain) may be used as the elastic body 30, and the repulsive force (stress) applied to the protective plate 10 can be made smaller, so that the display quality is further improved. Has an improving effect.

Further, in the liquid crystal display device 110 according to the fifth embodiment of the present disclosure, the elastic body 30 when the protective plate 10 has a curved shape is shown, but the liquid crystal display of the flat protective plate 1 of the first to fourth embodiments is shown. A similar configuration can be applied to the elastic body 3 of the display device 100. If there is a tendency for a specific gap difference to occur depending on the joining position of the protective plate 1 and the housing 4 due to changes in temperature and humidity, manufacturing variations, etc., the thickness of the elastic body 3 before joining is not uniform and the joining position is not uniform. It is good to make it different depending on.

By changing the thickness of the elastic body 3 before joining depending on the joining position between the protective plate 1 and the housing 4, the difference in the amount of deformation (shrinkage) of the elastic body 3 depending on the joining position between the protective plate 1 and the housing 4 The thickness of the elastic body 3 can be made smaller than that of a uniform one, and the protective plate 1 is deformed and the influence of the deformation stress extends to the liquid crystal panel 2 bonded to the protective plate 1, resulting in uneven brightness of the display screen 2a. Alternatively, it is possible to further suppress deterioration of display quality due to light omission during black display.

In the liquid

crystal display devices

100 and 110 of the first to fifth embodiments of the present disclosure, the case where the

protective plates

1, 10 and the

liquid crystal panels

2, 20 or the display screens 2a and 20a are rectangular is shown. The present disclosure is also applicable to any shape such as a triangle, a trapezoid, a circle, an ellipse, and an uneven shape.

1, 10

Protective plate

2, 20 LCD panel 2a,

20a Display screen

3, 3a, 3b, 30, 30a, 30b,

30c Elastic body

4, 40

Housing

51, 52

Adhesive member

6, 60, 62, 64

Transparent adhesive member

7a, 7b, 8a, 8b Moisture-proof or waterproof member 70

Functional element

90, 92

Rear light source

100, 110 Liquid crystal display device

Claims

LCD panel and
A housing for storing the liquid crystal panel and
A protective plate joined at the front surface of the liquid crystal panel is provided.
The protective plate and the housing are joined at a joint portion located on the outer peripheral portion of the liquid crystal panel.
In the gap created by the difference in parallelism between the protective plate and the housing, an elastic body that deforms to a maximum value or more of the gap amount that differs depending on the position of the joint is arranged between the protective plate and the housing. hand,
The gap is filled with the elastic body,
A liquid crystal display device that is joined to the housing without the protective plate being deformed.
The liquid crystal display device according to claim 1, wherein the elastic body has a moisture-proof or waterproof member attached or coated on the surface of the joint portion exposed to the gap.
The liquid crystal display device according to claim 1 or 2, wherein the elastic body has a surface exposed to the gap of the joint portion to which a moisture-proof or waterproof member is attached or applied together with the protective plate or the housing. ..
The liquid crystal display device according to any one of claims 1 to 3, wherein the elastic body has a thickness before joining that differs depending on the joining position between the protective plate and the housing.
The liquid crystal display device according to any one of claims 1 to 4, wherein the elastic body is a member having permanent strain or residual strain.
The liquid crystal display device according to any one of claims 1 to 5, wherein the elastic body is in a state of permanent strain or residual strain at least a part of the joint portion.
The liquid crystal display device according to any one of claims 1 to 6, wherein a functional element for input / output is arranged on the back side of the protective plate.
The liquid crystal display device according to any one of claims 1 to 7, wherein the protective plate and the liquid crystal panel are curved.