TW202202908A - Liquid crystal display device - Google Patents

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

The present disclosure relates to a liquid crystal display device. In particular, a liquid crystal display device includes a liquid crystal panel, a housing (rear frame) that accommodates the liquid crystal panel, and a protective plate (cover plate) joined to the front surface of the liquid crystal panel.

The liquid crystal display device can be easily reduced in thickness and power consumption, 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, portable terminals, vehicles, and industrial displays. A liquid crystal display device generally electrically controls the alignment direction of liquid crystal sandwiched between a pair of transparent substrates serving as a liquid crystal panel, and then performs display by adjusting the amount of light supplied from a back light source (backlight).

In particular, in the fields of portable terminals, vehicles, and industrial applications, a technology has been developed for adhering a protective plate made of translucent glass, resin, or the like to the entire front surface of a liquid crystal panel. In addition, input/output functional elements such as a touch panel and an acoustic panel may be arranged between the protective plate and the liquid crystal panel. (For example, refer to Patent Documents 1, 2, and 3) [Prior Art Literature]

[Patent Literature] [Patent Document 1] Japanese Patent Laid-Open No. 2008-90053 [Patent Document 2] Japanese Patent Laid-Open No. 2010-91966 [Patent Document 3] Japanese Patent Application Laid-Open No. 2012-68431

[Problems to be solved by the invention]

However, in a liquid crystal display device including a liquid crystal panel, a housing housing the liquid crystal panel, and a protective plate bonded to the front surface of the liquid crystal panel, and the back surface of the protective plate and the housing are bonded to the outer periphery of the liquid crystal panel, the following problems arise.

When the parallelism of the joint between the protective plate and the frame is different, and the size of the gap between the two varies depending on the joint position of the protective plate and the frame, use double-sided tape, adhesive, screws, etc. to attach the protective plate to the frame. When the body is joined, at the joining position where the gap between the protective plate and the frame body is large, the protective plate with low rigidity is deformed. As a result, the influence of the stress accompanying the deformation is applied to the liquid crystal panel bonded to the protective plate, and the display quality may be degraded due to uneven brightness of the display screen, light leakage during black display, and the like.

The present disclosure is made to solve the above-mentioned problems, and an object of the present disclosure is to provide a liquid crystal display device in which, when the protective plate is joined to the frame body, even if the parallelism of the joining surface is poor, the size of the gap varies depending on the joining position. The protective plate is hardly deformed even after bonding, and when the liquid crystal panel bonded to the protective plate is displayed, there is almost no degradation in display quality such as uneven brightness of the display screen and light leakage during black display. [Means for solving problems]

The liquid crystal display device of the present disclosure includes a liquid crystal panel, a frame body that accommodates the liquid crystal panel, and a protective plate joined to the front surface of the liquid crystal panel, the protective plate and the frame body being located at the outer peripheral portion of the liquid crystal panel The joint part is joined, and in the gap caused by the difference in parallelism between the protection plate and the frame body, the elastic body is arranged to deform to the maximum value of the gap amount that varies depending on the position of the joint part. Between the protection plate and the frame body, the gap is filled with the elastic body, so that the protection plate is joined to the frame body without being deformed. [Inventive effect]

According to the configuration of the present disclosure, it is possible to obtain a liquid crystal display device in which, when the protective plate and the housing are joined, even if the parallelism of the joining surfaces is poor, and the size of the gap varies depending on the position, the protective plate is hardly deformed and hardly exists. The display quality of the display screen of the liquid crystal panel bonded to the protective plate is reduced in luminance unevenness, light leakage during black display, and the like.

<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 of the present disclosure. FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1 . FIG. 3 is a cross-sectional view taken along line B-B of FIG. 1 .

In the liquid crystal display device 100 of the present disclosure, the protective plate 1 is located on the outermost surface, and the liquid crystal panels 2 are joined to each other on the backside of the protective plate 1 by the transparent adhesive member 6 . The display screen 2 a of the liquid crystal panel 2 can be seen from the surface of the protective plate 1 . The display screen 2 a is slightly smaller in size than the liquid crystal panel 2 because the outer peripheral portion of the liquid crystal panel 2 has a mounting portion, a terminal portion with 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 frame 4 having an opening so as to surround the liquid crystal panel 2 is also joined to the back surface of the protective plate 1 via the elastic body 3 . The housing 4 is made of plastic or metal having an opening for accommodating the liquid crystal panel 2, the back light source 90, and the like. In the figure, the frame body 4 is joined to the back surface of the protective plate 1 at the joining portion located at the outer peripheral portion of the liquid crystal panel 2 . More specifically, the frame body 4 is joined to the back surface of the protective plate 1 in a frame-shaped region surrounding the liquid crystal panel 2 . The elastic body 3 is arranged in this frame-shaped region. The elastic body 3 is shown in a frame-like shape, but may be divided into a plurality of shapes (for example, each of the four sides has a linear shape).

Although not shown in detail in the liquid crystal panel 2, the array substrate on which the wirings and electrodes are formed and the opposing substrate on which the color filter and the like are formed are arranged in parallel and bonded to each other. In addition, liquid crystal is sealed between the array substrate and the opposing substrate. The polarizers are respectively attached to the outer surface sides of the array substrate and the opposite substrate. Therefore, when the liquid crystal panel 2 is shown in detail, it becomes a laminated structure including a polarizer-counter substrate-liquid crystal-array substrate-polarizer.

The display area 2a of the liquid crystal panel 2 is composed of a plurality of picture elements. The image of the display device is formed by applying a signal corresponding to the displayed image to each picture element of the display area 2a. In addition, the back surface light source 90 is provided on the back surface of the liquid crystal panel 2, and by irradiating light from the back surface, an observer can see a display image.

In FIG. 2 , the structure in which the back light source 90 is mounted on the liquid crystal panel 2 is shown, but the back light source 90 may be mounted in the opening of the housing 4 as long as it is the liquid crystal panel 2 provided in the liquid crystal display device 100 . The structure of the back side can also be other positions.

In addition, although not shown, a terminal or wiring opening for supplying power or signals to the liquid crystal panel 2 and the rear light source 90 and the like is provided on a part of the side surface or the rear surface of the housing 4 .

Next, a structure in which the protective plate 1 and the frame body 4 are joined via the elastic body 3 will be described in detail with reference to FIGS. 2 and 3 . In FIGS. 2 and 3 , the structure in which the adhesive members 51 and 52 such as double-sided tape or adhesive and the elastic body 3 fill the gap between the protective plate 1 and the frame body 4 are shown, but in FIGS. 2 and 3 On the left and right sides of FIG. 3 , the size of the gap between the protective plate 1 and the frame body 4 is different. This is due to the difference in parallelism between the protective plate 1 and the frame body 4 . When expressing the size of the gap later, the expression amount of the gap is sometimes used.

In FIGS. 2 and 3 , the amount of clearance on the left side is small and the amount of clearance on the right side is large. Specifically, in FIGS. 2 and 3 , the thickness of the elastic body 3 a shown on the left side is thinner than the thickness of the elastic body 3 b shown on the right side. As shown in FIG. 3, the reason for this difference is that the parallelism of the protective plate 1 and the frame body 4 is different between the left and right sides, and the amount of the gap between them varies depending on the position.

Before joining the protective plate 1 and the frame body 4, the elastic body 3 has a certain thickness. However, after the protective plate 1 and the frame body 4 are joined, the elastic body 3 deforms (shrinks) according to the amount of the gap depending on the position to fill the gap between the protective plate 1 and the frame body 4 . At this time, since the amount of clearance and the amount of deformation are different depending on the position, the thicknesses of the elastic bodies 3a and 3b are different. That is, the elastic body 3a in the position where the gap is small is thinner than the elastic body 3b in the position where the gap is large.

Here, the joint surface of the elastic body 3 and the protective plate 1 and the joint surface of the elastic body 3 and the frame body 4 are joined via adhesive members 51 and 52 such as double-sided tape or adhesive, respectively. Since the adhesive members 51 and 52 are very thin compared with the elastic body 3, the thicknesses on the left and right sides are not significantly different in Figs. 2 and 3 like the elastic bodies 3a and 3b.

The elastic body 3 is made of a material and thickness that can deform (shrink) to the maximum value of the gap between the protective plate 1 and the frame body 4 due to the difference in parallelism between the protective plate 1 and the frame body 4. Elastomer. Moreover, it is preferable that the elastic body 3 is a material which has a good sealing property like a normal O-ring, a gasket, a gasket, etc., and the property which has a large restoring force to the original thickness.

That is, as the elastic body 3, a material having a large permanent deformation (elastic deformation), which is deformed by a pressing force after joining, is preferably a material having a restoring force to return to its original thickness. If the thickness is small, the original thickness cannot be restored even if the pressing force is removed, so as to minimize the stress applied to the protective plate 1 due to the deformation caused by the bonding.

For example, it is preferable to deform (shrink) an elastic body, rubber, sponge, foamed styrene, polyurethane resin, etc. with a certain deformation (shrinkage) rate for a certain period of time, which means that the thickness restored by eliminating the pressing force is the same as the original thickness. The permanent deformation ratio of the ratio of the difference in thickness to the amount of deformation (shrinkage) is 10% or more, preferably 30% to 40% or more.

Hereinafter, the reason why a material having permanent deformation (elastic deformation) is preferable will be explained. In a position where the gap between the protective plate 1 and the frame body 4 is small, the deformation amount (shrinkage amount) of the elastic body 3 also increases. Here, when the elastic body 3 uses an elastic body, rubber, or the like used in an O-ring, a gasket, a gasket, or the like, if the deformation amount (shrinkage amount) is large, the repulsive force (stress) also increases.

Generally, the protection plate 1 is flat and has lower rigidity than the frame body 4 having an opening. Therefore, as shown on the left side of FIGS. 2 and 3 , where the gap between the protection plate 1 and the frame body 4 is reduced, the elastic body The deformation amount (shrinkage amount) of 3 a also increases, and the rebound force (stress) applied by the elastic body 3 to the protective plate 1 also increases.

Then, when the protective plate 1 is deformed by the repulsive force, the deformation stress applied to the liquid crystal panel 2 via the protective plate 1 acts, causing uneven brightness and black color of the display screen 2 a during display by the liquid crystal display device 100 . Deterioration of display quality such as light leakage during display.

Here, it should be noted that the deformation stress caused by the unevenness of the gap amount, which is the root cause, is not necessarily generated only immediately after the joining of the protective plate 1 and the frame body 4 . For example, even if the protective plate 1 is not deformed immediately after joining, if the protective plate 1 is kept in a state in which a deformation stress is applied, the protective plate 1 gradually increases due to the influence of the surrounding environment such as temperature and humidity, or changes over time. When deformation occurs, the deformation stress generated on the liquid crystal panel 2 via the protective plate 1 acts, resulting in a decrease in display quality such as uneven brightness of the display screen 2 a during display of the liquid crystal display device 100 and light leakage during black display. Therefore, as the elastic body 3, as described above, it is preferable that the elastic body 3 has a permanent deformation (elastic deformation) that reduces the rebound force (stress) applied to the protective plate 1 after the protective plate 1 and the frame body 4 are joined.

In this way, in the display device 100 of the first embodiment, the difference in deformation (shrinkage) of the elastic body 3, which can be deformed to a material and thickness equal to or greater than the maximum value of the gap, is used to correct (absorb) the difference between the protective plate 1 and the elastic body 3. The difference in the amount of clearance caused by the joining position due to the difference in the parallelism of the frame body 4 . Therefore, even after the protective plate 1 and the casing 4 are joined, the protective plate 1 is hardly deformed, so the deformation stress caused by the difference in the gap between the protective plate 1 and the casing 4 does not affect the liquid crystal panel 2, and the display Quality is also maintained.

Furthermore, if the elastic body 3 is a material having a large permanent deformation (elastic deformation), the elastic body can maintain a small state of resilience even in the portion where the deformation (shrinkage) is large after the protection plate 1 and the frame body 4 are joined. . Therefore, there is almost no influence on the deformation stress of the protective plate 1 or the liquid crystal panel 2 , so that the display quality of the display screen 2 a of the liquid crystal panel 2 after joining is hardly deteriorated, such as uneven brightness and light leakage during black display. <Embodiment 2>

4 is a cross-sectional view of the display device according to Embodiment 2 of the present disclosure, and corresponds to the cross-sectional view taken along the line A-A in FIG. 1 . In FIGS. 2 and 3 for explanation in the first embodiment, the elastic body 3 is directly exposed in the gap between the protective plate 1 and the frame body 4 . In addition, the part exposed here refers to the side surface part of the elastic body 3, not the joint surface of the elastic body 3 and the protective plate 1, and the joint surface of the elastic body 3 and the frame body 4.

When the elastic body 3 is, for example, porous sponge, foamed styrene, polyurethane resin, etc., it is often inferior in moisture resistance or water resistance as compared with the elastic body, rubber, etc. used in O-rings, gaskets, gaskets, etc. . In the configuration of the second embodiment, a member 7 made of a protective tape or resin, which is excellent in moisture resistance or water resistance, is pasted or coated on a portion of the elastic body 3 exposed in the gap between the protective plate 1 and the frame body 4 .

The member 7 excellent in moisture resistance and water resistance varies in length (width) depending on the thickness of the elastic bodies 3 a and 3 b exposed in the gap between the protective plate 1 and the frame body 4 . Alternatively, if the member 7 , such as a protective tape or resin excellent in moisture resistance or water resistance, is a member that expands and contracts together with the elastic body 3 , the side surface of the elastic body 3 having a uniform thickness before joining the protective plate 1 and the frame body 4 may be used. Formed by sticking or coating.

In Embodiment 2, since the part of the elastic body 3 exposed in the gap between the protective plate 1 and the frame body 4 is pasted or coated with a protective tape or a resin or the like, a member 7 having excellent moisture resistance or water resistance is used. Compared with Embodiment 1, the moisture resistance or water resistance of the liquid crystal display device 100 is improved. <Embodiment 3>

5 is a cross-sectional view of the display device according to Embodiment 3 of the present disclosure, and corresponds to the cross-sectional view taken along the line A-A in FIG. 1 . In FIG. 4 for explanation in Embodiment 2, a protective tape or resin, which is excellent in moisture resistance or water resistance, is pasted or coated on the portion of the elastic body 3 exposed in the gap between the protective plate 1 and the frame body 4 . Part 7. In the third embodiment, the member 8 having excellent moisture resistance or water resistance, such as a protective tape or resin, is not only pasted or coated on the portion of the elastic body 3 exposed in the gap between the protective plate 1 and the frame body 4, but also is attached to the elastic body 3. The exposed portion is continuously pasted or coated on the back surface of the protective plate 1 or the side surface of the frame body 4 . With such a structure, the moisture resistance and water resistance of the liquid crystal display device 100 are further improved.

In the configuration of the third embodiment, the member 8 having excellent moisture resistance and water resistance is attached or coated after the protective plate 1 and the frame body 4 are joined together. The members 8a and 8b excellent in moisture resistance and waterproofness may vary in width (length) according to the size of the gap between the protective plate 1 and the frame body 4, or may have the same width (length) regardless of the size of the gap.

In the elastic body 3, the portion exposed in the gap between the protective plate 1 and the frame body 4 is made of a protective tape, resin, etc., which is excellent in moisture resistance or waterproofness, and is continuous with a part of the protective plate 1 or the frame body 4. covered by sticking or coating. Furthermore, since the side surfaces of the adhesive members 51 and 52 are also covered by the member 8 , the moisture resistance and water resistance of the liquid crystal display device 100 of the third embodiment are further improved than those of the first and second embodiments. <Embodiment 4>

FIG. 6 is a cross-sectional view of the display device according to Embodiment 4 of the present disclosure, and corresponds to the cross-sectional view taken along the line A-A in FIG. 1 . In addition to the display devices described in Embodiments 1 to 3, in Embodiment 4, a display device in which a 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 electrostatic capacitance, pressure, magnetic field, light, or electromagnetic waves, or an output element such as an acoustic plate or a vibration plate. The translucent functional element 70 is located between the protective plate 1 and the liquid crystal panel 2, and is joined by transparent adhesive members 62 and 64, respectively.

The display device according to Embodiment 4 can not only add a display function to the liquid crystal display device 100 but also add a display function to the liquid crystal display device 100 by arranging functional elements for input and output on the back side of the protective plate 1 without being limited to between the protective plate 1 and the liquid crystal panel 2 . Input or output function. <Embodiment 5>

7 is a front view of a liquid crystal display device according to Embodiment 5 of the present disclosure. FIG. 8 is a cross-sectional view taken along line A-A of the liquid crystal display device according to Embodiment 5 of FIG. 7 . FIG. 9 is a cross-sectional view taken along the line B-B of the liquid crystal display device according to Embodiment 5 of FIG. 7 . 10 is a cross-sectional view taken along the line B-B of the elastic body before bonding of the liquid crystal display device of Embodiment 5 of FIG. 7 .

In the liquid crystal display device 110 of Embodiment 5, the protective plate 10 is formed in a curved shape. The liquid crystal panel 20 and the display screen 20a joined to the protective plate 10 also have curved shapes. As described in Embodiment 1, the liquid crystal panel 20 has a laminated structure including a polarizer-counter substrate-liquid crystal-array substrate-polarizer. In the liquid crystal panel 20, the thicknesses of the array substrate and the opposite substrate are thin, eg, 0.1 to 0.4 mm, so as to be bent. Corresponding to the liquid crystal panel 20, the back light source 92 also has a curved shape.

7 is also the same as Embodiments 1 to 4 in 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 frame body 40 . However, in FIG. 7 , since the protection plate 10 has a curved shape, the frame body 40 is different from Embodiments 1 to 4 in that the frame body 40 also has a curved shape at the position where the frame body 40 is joined to the protection plate 10 .

The thickness of the elastic body 30 at the end portion of the curved shape shown in the cross-sectional views of FIGS. 8 and 9 as an example for explaining the fifth embodiment is larger than the thickness of the central portion. In addition, the gap at the end is in a state where the right side is larger than 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.

At the position where the protective plate 10 and the frame body 40 are joined, the parallelism (curvature) of the curved shapes of the protective plate 10 and the frame body 40 is preferably the same. However, it is more difficult to make the parallelism (curvature) of the curved shape uniform than that of the flat shape.

This is because the curvature of the protective plate 10 in the curved shape is difficult to be uniform, and the amount of the gap is more likely to change depending on the position than in the case of the flat shape. In addition, variations and changes in the gap amount are likely to occur due to changes in temperature and humidity, manufacturing variations, and the like. In particular, in the end portion of the protective plate 10 having a curved shape, the variation or change in the amount of clearance tends to become large.

As described above, if the rebound force (stress) of the elastic body 30 applied to the end portion of the curved protective plate 10 increases, the stress is applied to the liquid crystal panel 20 unevenly, which is likely to occur at the end portion of the display screen 20a. Poor display.

In order to solve this problem, FIG. 10 , which is an example used in the description of Embodiment 5, makes the thickness of the elastic body 30 before joining non-uniform, and changes the thickness according to the position. Here, by making the thickness of the elastic body 30 in the left and right end portions of the protective plate 10 larger than that in the central portion, the elastic body 30 absorbs the rebound force (stress) applied to the end portions of the protective plate 10 , compared with a uniform thickness. In general, the gap between the left and right ends of the protective plate 10 is easily enlarged and deformed due to changes in temperature, humidity, manufacturing variation, etc., so as shown in FIG. 10, the left and right ends before joining can be made. The thickness of the elastic bodies 30a and 30b is larger than the thickness of the elastic body 30c in the center part.

As described above, compared with the uniform thickness of the elastic body 30 before joining, changing the thickness in accordance with the tendency of the gap amount that varies depending on the joining position can make the elastic body smaller after the protective plate 10 and the frame body 40 are joined. 30 The amount of deformation (shrinkage) varies according to the joint position. Since there is no position where the amount of deformation (shrinkage) of the elastic body 30 is particularly large, the rebound force (stress) applied to the protection plate 10 can be reduced. As a result, there is almost no influence on the deformation stress of the protective plate 10 and the liquid crystal panel 20 , so there is almost no display quality problem such as uneven brightness of the display screen 20 a of the liquid crystal panel 20 or light leakage during black display after bonding. reduce.

In addition, in the liquid crystal display device 110 of the fifth embodiment, as shown in the cross-sectional views of FIGS. 8 and 9 , the protective plate 10 and the display screen 20a have a convexly curved configuration, but it is also possible to apply a concave shape. Equally curved structures.

In addition, although the thickness of the left and right end parts of the elastic body 30 is set to be larger than that of the center part, it is also applicable to the opposite structure where the thickness of the left and right end parts is smaller than that of the center part.

In addition, in the fifth aspect of the present disclosure, a material having permanent deformation (elastic deformation) can also be used as the elastic body 30 , and the rebound force (stress) applied to the protection plate 10 can be further reduced, so that the display quality can be further improved. Effect.

In addition, in the liquid crystal display device 110 according to Embodiment 5 of the present disclosure, the elastic body 30 is shown when the protective plate 10 has a curved shape, but the elastic body 30 can be applied to the liquid crystal display device 100 of the flat protective plate 1 of Elastomer 3. When there is a tendency for a specific gap difference to occur depending on the joining position of the protective plate 1 and the frame body 4 due to changes in temperature, humidity, manufacturing variation, etc., the thickness of the elastic body 3 before joining can be made non-uniform. differs depending on the engagement location.

By changing the thickness of the elastic body 3 before joining according to the joining position of the protective plate 1 and the frame body 4, the amount of deformation (shrinkage) of the elastic body 3 caused by the joining position of the protective plate 1 and the casing 4 can be reduced. The difference is smaller than the difference when the thickness of the elastic body 3 is uniform, and it is possible to further suppress the influence of the deformation stress caused by the deformation of the protective plate 1 to spread to the liquid crystal panel 2 joined to the protective plate 1, resulting in uneven brightness of the display screen 2a and black display. Leakage of light, etc., will result in a decrease in display quality.

In addition, in the liquid crystal display devices 100 and 110 according to Embodiments 1 to 5 of the present disclosure, the protective plates 1 and 10 , the liquid crystal panels 2 and 20 , or the display screens 2 a and 20 a are shown as being rectangular, but the present disclosure also It can be applied to any shape such as triangle, trapezoid, circle, ellipse, concave-convex shape, etc.

1, 10: Protection board 2, 20: LCD panel 2a, 20a: Display screen 3, 3a, 3b, 30, 30a, 30b, 30c: Elastomer 4. 40: Frame 6, 60, 62, 64: Transparent bonding parts 7, 7a, 7b, 8, 8a, 8b: Parts with excellent moisture resistance or water resistance 51, 52: Bonding parts 70: Functional elements 90, 92: back light source 100, 110: Liquid crystal display device

FIG. 1 is a front view of the liquid crystal display device of the present disclosure. 2 is a cross-sectional view taken along line A-A of the liquid crystal display device according to Embodiment 1 of the present disclosure. 3 is a cross-sectional view taken along line B-B of the liquid crystal display device according to Embodiment 1 of the present disclosure. 4 is a cross-sectional view taken along the line A-A of the liquid crystal display device according to Embodiment 2 of the present disclosure. 5 is a cross-sectional view taken along line A-A of the liquid crystal display device according to Embodiment 3 of the present disclosure. 6 is a cross-sectional view taken along the line A-A of the liquid crystal display device according to Embodiment 4 of the present disclosure. 7 is a front view of a liquid crystal display device according to Embodiment 5 of the present disclosure. 8 is a cross-sectional view taken along the line A-A of the liquid crystal display device according to Embodiment 5 of the present disclosure. 9 is a cross-sectional view taken along the line B-B of the liquid crystal display device according to Embodiment 5 of the present disclosure. 10 is a cross-sectional view taken along the line B-B of the elastic body before bonding of the liquid crystal display device according to Embodiment 5 of the present disclosure.

1: Protective plate

2: LCD panel

3a, 3b: Elastomers

4: Frame

6: Transparent bonding parts

51, 52: Bonding parts

90: Back light source

Claims (8)

A liquid crystal display device, characterized in that it includes LCD panel, a housing for accommodating the liquid crystal panel, and A protective plate joined to the front surface of the liquid crystal panel, The protective plate and the frame are joined at a joint located at the outer periphery of the liquid crystal panel, In the gap generated by the difference in parallelism between the protective plate and the frame body, an elastic body deformed to a maximum value of the gap amount that varies depending on the position of the joint portion is arranged between the protective plate and the frame. between the frames, Filling the gap with the elastomer, Therefore, the protection plate is joined to the frame body without being deformed. The liquid crystal display device according to claim 1, wherein a moisture-proof or waterproof member is adhered or coated on the surface of the elastic body exposed in the gap of the joint portion. The liquid crystal display device according to claim 1, wherein the surface of the elastic body exposed to the gap of the joint portion is adhered or coated with a moisture-proof or moisture-proof material together with the protective plate or the frame body. Waterproof parts. The liquid crystal display device according to claim 1, wherein the thickness of the elastic body before the joining differs depending on the joining position of the protective plate and the frame body. The liquid crystal display device according to claim 1, wherein the elastic system has a permanent deformation (residual deformation) member. The liquid crystal display device according to claim 1, wherein the elastic body is in a state of permanent deformation (residual deformation) in at least a part of the joint portion. The liquid crystal display device according to claim 1, wherein functional elements for input and output are 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.

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