WO2021038739A1

WO2021038739A1 - Display device

Info

Publication number: WO2021038739A1
Application number: PCT/JP2019/033629
Authority: WO
Inventors: 真彦宇野
Original assignee: 三菱電機株式会社
Priority date: 2019-08-28
Filing date: 2019-08-28
Publication date: 2021-03-04
Also published as: JPWO2021038739A1; JP7023423B2; DE112019007570T5

Abstract

A protection cover (50) is adhered and fixed to a display surface (11) of a liquid crystal panel (10). A backlight (20) is disposed on the back surface of the liquid crystal panel (10), and has a backlight adhesion part (21) that is adhered and fixed to the outer peripheral side of the liquid crystal panel (10) in the protection cover (50). An intermediate structure material (60) is disposed between the backlight (20) and a housing (40), and has an intermediate structure material adhesion part (62) that is adhered and fixed to the outer peripheral side of fixing parts (61) for fixing the housing (40) and the backlight adhesion part (21) in the protection cover (50).

Description

Display device

The present invention relates to a display device.

Conventional display devices include a liquid crystal panel, a backlight, a protective cover adhesively fixed to the front surface of the liquid crystal panel, and a bracket adhesively fixed to the protective cover while holding the backlight on the rear surface of the liquid crystal panel. It is provided with a housing that is screwed to and fixed to a protective cover (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2016-122151

Since the conventional display device as described in Patent Document 1 has a configuration in which the housing is screwed to the bracket holding the backlight, the backlight itself is deformed by the stress of fastening. , It also applies a large stress to the adhesive part between the backlight and the protective cover. Therefore, in the conventional display device, there is a problem that display unevenness occurs due to the distortion of the backlight and the liquid crystal panel due to these stresses.

The present invention has been made to solve the above problems, and an object of the present invention is to provide a display device in which display unevenness is unlikely to occur.

The display device according to the present invention is arranged on a liquid crystal panel, a housing having a housing opening for exposing the display surface of the liquid crystal panel, a protective cover adhesively fixed to the display surface of the liquid crystal panel, and the back surface of the liquid crystal panel. A backlight having a backlight adhesive portion that is adhesively fixed to the outer peripheral side of the liquid crystal panel in the protective cover, and a backlight that is arranged between the backlight and the housing and fixes the housing and the fixing portion and the protective cover. It is provided with an intermediate structural material having an intermediate structural material adhesive portion that is adhesively fixed on the outer peripheral side of the adhesive portion.

According to the present invention, the housing and the protective cover are indirectly fixed by the liquid crystal panel and the intermediate structural material having no contact point with the backlight, so that a display device in which display unevenness is unlikely to occur is provided. can do.

It is sectional drawing which shows the structural example of the display device which concerns on Embodiment 1. FIG. It is a figure which shows the reference example for helping the understanding of the display device which concerns on Embodiment 1. FIG. It is sectional drawing which shows the structural example of the display device which concerns on Embodiment 2. FIG. It is an enlarged view of the spring structure of FIG. 3 and the peripheral portion thereof. It is a top view which shows the structural example of the intermediate structural material in Embodiment 2. FIG. It is a top view which shows the modification of the intermediate structural material in Embodiment 2. FIG. It is a top view which shows the modification of the intermediate structural material in Embodiment 2. FIG. It is a top view which shows the modification of the intermediate structural material in Embodiment 2. FIG.

Hereinafter, in order to explain the present invention in more detail, a mode for carrying out the present invention will be described with reference to the accompanying drawings.
Embodiment 1.
FIG. 1 is a cross-sectional view showing a configuration example of the display device 1 according to the first embodiment. The display device 1 includes a liquid crystal module 30, a housing 40, a protective cover 50, and an intermediate structural material 60.

The liquid crystal module 30 includes a liquid crystal panel 10, a backlight 20, and a backlight adhesive portion 21. A protective cover 50 is arranged on the display surface 11 of the liquid crystal panel 10, and the protective cover 50 is placed on the display surface 11 by opticarboning in which the gap between the display surface 11 and the protective cover 50 is filled with a transparent resin 51 (that is, a transparent adhesive). It is adhesively fixed. The protective cover 50 is made of transparent glass, resin, or the like.

A backlight 20 is arranged on the back surface of the liquid crystal panel 10. The backlight adhesive portion 21 having a shape extending from the side surface of the backlight 20 to the protective cover 50 is adhesively fixed to the protective cover 50 by the adhesive 22. The backlight adhesive portion 21 is located on the outer peripheral side of the liquid crystal panel 10 in the protective cover 50.

The housing 40 is a design member that houses the liquid crystal module 30 inside, and is made of resin or the like. The housing 40 has a housing opening 41 that exposes the display surface 11 of the liquid crystal panel 10. The housing opening 41 is closed by a protective cover 50 adhesively fixed to the display surface 11 of the liquid crystal panel 10.

The intermediate structural material 60 is arranged between the backlight 20 and the housing 40. The intermediate structural material 60 is a box body made of resin, sheet metal, or the like, and a fixing portion 61 for fixing the housing 40 is provided on the bottom surface portion of the box body facing the backlight 20. .. In the fixing portion 61, the housing 40 and the intermediate structural member 60 are fixed by screws, an adhesive or the like. FIG. 1 shows an example in which the housing 40 and the intermediate structural member 60 are fixed by the screws 42 shown by the broken lines. In this case, the fixing portion 61 provided on the intermediate structural member 60 is a boss for fastening the screw 42. Further, at the edge of the box body which is the intermediate structural material 60, an intermediate structural material adhesive portion 62 which is adhesively fixed to the protective cover 50 by the adhesive 63 is provided. The intermediate structural material adhesive portion 62 is located on the outer peripheral side of the backlight adhesive portion 21 of the protective cover 50.

Next, the procedure for assembling the display device 1 will be described.
First, the transparent resin 51 adheres and fixes the protective cover 50 and the liquid crystal panel 10, and the adhesive 22 adheres and fixes the protective cover 50 and the backlight 20. Subsequently, the protective cover 50 and the intermediate structural member 60 are adhesively fixed by the adhesive 63. Finally, the housing 40 and the intermediate structural member 60 are fixed by the screws 42.

The features of the intermediate structural material 60 are as follows (1) to (4).
(1) The intermediate structural material 60 is separated from the liquid crystal module 30 and has no contact point.
(2) The intermediate structural material 60 is separated from the housing 40, but is screw-fixed to the housing 40.
(3) The intermediate structural material 60 is separated from the protective cover 50, but is adhesively fixed to the protective cover 50.
(4) The intermediate structural member 60 is arranged between the protective cover 50 and the housing 40, and indirectly fixes the protective cover 50 and the housing 40.

The stress generated by fastening the screw 42 is not applied to the backlight 20. Therefore, the backlight 20 is not deformed, and as a result, no stress is generated in the adhesive portion (that is, the position of the adhesive 22) between the backlight 20 and the protective cover 50.
Further, the stress generated by fastening the screw 42 is applied to the intermediate structural material 60, and as a result, some stress is also generated at the adhesive portion between the intermediate structural material 60 and the protective cover 50. However, since the position where this stress is generated (that is, the position of the adhesive 63) is relatively far from the liquid crystal panel 10, the distortion of the liquid crystal panel 10 is small. Therefore, display unevenness is less likely to occur.

FIG. 2 is a diagram showing a reference example for assisting the understanding of the display device 1 according to the first embodiment. In the display device 1a of the reference example, the same or corresponding parts as those of the display device 1 according to the first embodiment are designated by the same reference numerals. In the display device 1a of the reference example, the end portion of the housing 40 on the housing opening 41 side is adhesively fixed to the protective cover 50 by the adhesive 43. Further, the end portion of the housing 40 opposite to the housing opening 41 is fixed to the backlight 20 by the screw 42 indicated by the broken line. Therefore, the stress A1 generated by fastening the screw 42 deforms the backlight 20 itself, and also with respect to the adhesive portion between the backlight 20 and the protective cover 50 (that is, the position of the adhesive 22). A large stress A2 is applied. These stresses A1 and A2 affect the liquid crystal panel 10, and the liquid crystal panel 10 is distorted. The distortion of the liquid crystal panel 10 causes display unevenness. Further, since the position where the stress A2 is applied (that is, the position of the adhesive 22) is relatively close to the liquid crystal panel 10, the distortion of the liquid crystal panel 10 becomes large and display unevenness is likely to occur.

As described above, the display device 1 according to the first embodiment includes a liquid crystal panel 10, a housing 40, a protective cover 50, a backlight 20, and an intermediate structural material 60. The housing 40 has a housing opening 41 that exposes the display surface 11 of the liquid crystal panel 10. The protective cover 50 is adhesively fixed to the display surface 11 of the liquid crystal panel 10. The backlight 20 is arranged on the back surface of the liquid crystal panel 10 and has a backlight adhesive portion 21 which is adhesively fixed to the outer peripheral side of the liquid crystal panel 10 in the protective cover 50. The intermediate structural member 60 is arranged between the backlight 20 and the housing 40, and is bonded and fixed to the outer peripheral side of the fixing portion 61 for fixing the housing 40 and the backlight bonding portion 21 in the protective cover 50. It has a structural material adhesive portion 62. In this configuration, the stress generated when the housing 40 and the intermediate structural member 60 are fixed is relaxed by the intermediate structural member 60. Therefore, the stress applied to the liquid crystal module 30 is reduced, and display unevenness is less likely to occur.

Embodiment 2.
FIG. 3 is a cross-sectional view showing a configuration example of the display device 1 according to the second embodiment. FIG. 4 is an enlarged view of the spring structure 65 of FIG. 3 and its peripheral portion. FIG. 5 is a plan view showing a configuration example of the intermediate structural member 60 according to the second embodiment. In FIGS. 3, 4 and 5, the same or corresponding parts as those in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted. In FIG. 5, the housing 40 is not shown. Further, in FIG. 5, the intermediate structural member 60 is provided with four fixing portions 61, but the number of fixing portions 61 is arbitrary.

In the display device 1 according to the second embodiment, the intermediate structural member 60 has a spring structure 65 in the fixing portion 61 for fixing the housing 40. Since the intermediate structural material 60 is made of an elastic member such as resin or sheet metal, the wider the area of the intermediate structural material 60 facing the backlight 20, the more easily this portion is elastically deformed. , This portion functions as a spring structure 65. In the second embodiment, the opening 64 is provided in the portion of the intermediate structural member 60 facing the backlight 20, so that the periphery of the opening 64 functions as a more flexible spring structure 65. The number, position, and size of the openings 64 can be changed according to the required spring coefficient, as will be described later.

For example, when the housing 40 and the intermediate structural material 60 are fixed by the screws 42, a pressing or tensile stress A3 is applied to the intermediate structural material 60 when the screws 42 are fastened. For example, when a tap screw is used as the screw 42, if the tap screw is tightened too much, stress A3 in the pressing or pulling direction is applied to the intermediate structural material 60, and the adhesive portion between the intermediate structural material 60 and the protective cover 50 (that is, the intermediate structural material). Stress A4 is also generated in the bonded portion 62). Further, for example, when the housing 40 and the intermediate structural member 60 are fixed by an adhesive, if the adhesive is cured and shrunk, a stress A4 in the pressing direction is applied to the protective cover 50.

By elastically deforming and absorbing this stress A3 by the spring structure 65, the stress A4 between the intermediate structural member 60 and the protective cover 50 generated by fastening the screw 42 is relaxed. By relaxing the stress A4, the stress applied to the liquid crystal panel 10 via the protective cover 50 is reduced, and display unevenness can be reduced.

However, it is not only necessary to increase the flexibility of the spring structure 65, and if the flexibility is increased too much, the vibration resistance characteristics deteriorate, so that appropriate adjustment is required according to the size and structure of the display device 1. .. In the configuration examples of FIGS. 3, 4, and 5, the spring coefficient of the spring structure 65 is changed by adjusting the distance d1 of the spring structure 65, and as a result, the relaxation amount of the stress A4 is adjusted. .. The distance d1 is the distance from the end portion of the bottom surface of the intermediate structural member 60 to the fixed portion 61.

FIG. 6 is a plan view showing a modified example of the intermediate structural member 60 in the second embodiment. In FIG. 6, the housing 40 is not shown. In the modified example of FIG. 6, fixing portions 61-1 and fixing portions 61-2 are provided in advance at each of the four locations corresponding to the four fixing portions 61 in the intermediate structural member 60, and the fixing portions 61-are provided at the time of assembly. Either 1 or the fixing portion 61-2 is selected and fixed to the housing 40. As a result, the distance d1, that is, the spring coefficient of the spring structure 65 can be changed, and the relaxation amount of the stress A4 can be adjusted. In the example of FIG. 6, two fixing portions 61-1 and 61-2 are provided for each fixing portion 61, but the number of the fixing portions 61 is arbitrary.

Further, the intermediate structural member 60 may be composed of two members in which the portion facing the backlight 20 is separated. FIG. 7 is a plan view showing a modified example of the intermediate structural member 60 according to the second embodiment. In FIG. 7, the housing 40 is not shown. In the modified example of FIG. 7, the intermediate structural member 60 is composed of two members, the first intermediate structural member 60-1 and the second intermediate structural member 60-2. The first intermediate structural member 60-1 and the second intermediate structural member 60-2 have a shape in which the intermediate structural member 60 is cut in half and separated, and the separated portions face the backlight 20. As a result, the periphery of the separated portion of the first intermediate structural member 60-1 and the periphery of the separated portion of the second intermediate structural member 60-2 each function as the spring structure 65. By separating the intermediate structural member 60 in this way, the flexibility of the spring structure 65 may be increased and display unevenness may be reduced. The intermediate structural member 60 may be separated into three or more members.

FIG. 8 is a plan view showing a modified example of the intermediate structural member 60 in the second embodiment. In FIG. 8, the housing 40 is not shown. In the modified example of FIG. 8, the opening 64 is provided in the portion of the first intermediate structural member 60-1 facing the backlight 20, and facing the backlight 20 of the second intermediate structural member 60-2. An opening 64 is also provided in the portion to be used. By separating the intermediate structural member 60 and providing the opening 64 in this way, the flexibility of the spring structure 65 may be increased and display unevenness may be reduced.

Further, in the modified examples of FIGS. 7 and 8, a plurality of fixing portions 61-1 and 61-2 may be provided for one fixing portion 61 as in FIG. 6.

Further, the spring structure 65 may be made to function by reducing the thickness of the portion of the intermediate structural material 60 facing the backlight 20.

As described above, the intermediate structural member 60 of the second embodiment has the spring structure 65 in the fixing portion 61 for fixing the housing 40, so that the stress A3 generated when the housing 40 and the intermediate structural material 60 are fixed is generated. Is further relaxed by the spring structure 65. Therefore, the stress applied to the liquid crystal panel 10 via the protective cover 50 is further reduced, and the effect of reducing display unevenness can be increased.

Further, the intermediate structural member 60 of the second embodiment has a plurality of fixing portions 61-1 and 61-2 that change the spring constant of the spring structure 65, and among the plurality of fixing portions 61-1 and 61-2. The housing 40 is fixed to a part of the fixed portion (fixed portion 61-1 or fixed portion 61-2) of the above. Since the amount of stress relaxation of the spring structure 65 can be adjusted, display unevenness can be reduced while maintaining vibration resistance characteristics.

Further, the intermediate structural member 60 of the second embodiment has an opening 64 on the surface facing the backlight 20, and the periphery of the opening 64 functions as a spring structure 65. Since the amount of stress relaxation of the spring structure 65 can be adjusted, display unevenness can be reduced while maintaining vibration resistance characteristics.

Further, the intermediate structural member 60 of the second embodiment is composed of two members, a first intermediate structural member 60-1 and a second intermediate structural member 60-2, in which a portion facing the backlight 20 is separated. The portion facing each backlight 20 functions as a spring structure 65. Since the amount of stress relaxation of the spring structure 65 can be adjusted, display unevenness can be reduced while maintaining vibration resistance characteristics.

It should be noted that, within the scope of the present invention, it is possible to freely combine each embodiment, modify any component of each embodiment, or omit any component of each embodiment.

Since the display device according to the present invention reduces the stress applied to the liquid crystal module and makes it difficult for display unevenness to occur, it is suitable for use in a display device or the like in which the protective cover and the liquid crystal module are adhered by optimizing.

1,1a display device, 10 liquid crystal panel, 11 display surface, 20 backlight, 21 backlight adhesive part, 22 adhesive, 30 liquid crystal module, 40 housing, 41 housing opening, 42 screws, 43 adhesive, 50 Protective cover, 51 transparent resin, 60 intermediate structural material, 60-1 first intermediate structural material, 60-2 second intermediate structural material, 61, 61-1, 61-2 fixing part, 62 intermediate structural material adhesive part, 63 Adhesive, 64 openings, 65 spring structure, A1, A2, A3, A4 stress, d1 distance.

Claims

LCD panel and
A housing having a housing opening that exposes the display surface of the liquid crystal panel,
A protective cover adhesively fixed to the display surface of the liquid crystal panel,
A backlight having a backlight adhesive portion arranged on the back surface of the liquid crystal panel and adhesively fixed to the outer peripheral side of the liquid crystal panel in the protective cover,
An intermediate structure having an intermediate structural material adhesive portion arranged between the backlight and the housing and having a fixing portion for fixing the housing and an intermediate structural material adhesive portion adhesively fixed to the outer peripheral side of the backlight adhesive portion in the protective cover. Wood and
A display device comprising.
The display device according to claim 1, wherein the intermediate structural material has a spring structure in the fixing portion for fixing the housing.
The intermediate structural material has a plurality of the fixing portions for changing the spring constant of the spring structure, and the housing is fixed to a part of the fixing portions among the plurality of fixing portions. 2. The display device according to claim 2.
The display device according to claim 2, wherein the intermediate structural material has an opening on a surface facing the backlight, and the periphery of the opening functions as the spring structure.
2. The intermediate structural member is composed of two members in which a portion facing the backlight is separated, and a portion of each of the two members facing the backlight functions as the spring structure. The display device described.