JP2008089838A - Housing structure of display device and mobile apparatus equipped with same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a panel for liquid crystal protection from peeling off a housing structure of a display device owing to thermal expansion even under environmental conditions of high temperature and high humidity. <P>SOLUTION: The housing structure of the display device on which the protection panel 11 for protecting a liquid crystal panel 8 (display unit) is stuck is characterized in that a portion of the protection panel 11 is fixed to an upper housing 1 of the display device with a thermosetting adhesive material 12 and the other portion is fixed to the upper housing 1 with a thermoplastic adhesive material 13. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a housing structure of a display device and a portable device including the same, and more particularly to a structure for attaching a display unit protection panel.

  Conventionally, when a liquid crystal protection panel for protecting a liquid crystal portion is fixed to a display device, it is usually bonded using one kind of adhesive material. For this reason, when the environmental conditions are in a high temperature and high humidity state, the adhesive material may be softened and part of the protective panel may be peeled off.

  That is, the protective panel originally placed in a high temperature and high humidity state in a free state causes elongation due to stress due to the influence of temperature and humidity. However, a protective panel fixed with an adhesive or an adhesive material such as a double-sided tape cannot be stretched even if it is intended to stretch. For this reason, peeling occurs when the elongation stress changes in the direction inside the protective panel.

As a means for eliminating such peeling, for example, there is a connection method disclosed in Patent Document 1. In this connection method, an adhesive tape or sheet having an adhesive material layer on at least one surface of a base material, and two or more types of adhesive materials having different glass transition temperatures (Tg) are exposed in the adhesive material layer. When connecting the adhesive tape or sheet that has been wound and the end portion of the wound sheet-like material just before the end of unwinding to the starting end portion of another wound sheet-like material, in the width direction of the connecting portion The connection is made by sticking an adhesive tape or sheet.
Japanese Patent Laid-Open No. 9-3416

  However, in the connection method of Patent Document 1, since the adhesive material having only a different glass transition temperature (Tg) is used in a band shape, the central portion of the liquid crystal protection panel generated due to thermal expansion under a high temperature and high humidity condition. Due to the stress concentration applied to the protective layer, there is a problem that the force acts in the direction of floating the protective panel under the influence of the stress that has lost the refuge and peeling occurs.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a liquid crystal protection panel in a housing structure of a display device due to thermal expansion even under environmental conditions of high temperature and high humidity. It is to prevent peeling.

  In order to achieve the above object, in the present invention, the adhesive material for attaching the protective panel is composed of two types of adhesive materials.

Specifically, in the first invention, on the premise of a housing structure of a display device to which a protective panel for protecting the display unit is attached,
A part of the protective panel is fixed to the casing of the display device with a thermosetting adhesive material and the other part with a thermoplastic adhesive material.

  According to the above configuration, even if the thermoplastic adhesive material portion is softened under environmental conditions of high temperature and high humidity, the thermosetting adhesive material portion is cured after bonding. The force to lift the panel is suppressed by the hardness and adhesive force of the thermosetting adhesive material.

  In the second invention, the protective panel is fixed to the casing of the display device with a thermosetting adhesive material on the inside, and the display device is made of a thermoplastic adhesive material on the outer portion of the thermosetting adhesive material. It is fixed to the housing.

  According to the above configuration, when the environmental condition is high temperature and high humidity, when the protective panel tries to stretch at temperature and humidity, the outer adhesive material is a thermoplastic adhesive material, so it softens and expands due to heat. Can be released to the outside. In addition, since the inner adhesive material is a thermosetting adhesive material, it is not softened by heat, and the inward elongation stress can be prevented by adhesive force, and the protection panel can be prevented from floating. . On the other hand, since the outer adhesive material is thermoplastic, when the protective panel is peeled off and repaired or recycled, the adhesive material is easily deformed by applying heat. For this reason, the peripheral part of the protective panel is easily peeled off, and the protective panel is easily peeled off using the peripheral part as a handle, so that the repairability and the recyclability are excellent.

In the third invention, the casing is
A display window for exposing the display section;
A panel recess provided in the outer periphery of the display window and into which the protective panel is fitted.

  According to the above configuration, when the protective panel is fitted in the recess for the panel, it is difficult to insert a tool or the like at the time of repair or recycling, and the protective panel is difficult to peel off, but the outer part softens by applying heat. It becomes easy to peel off the protective panel by sandwiching or the like.

  In the fourth invention, when the protective panel is fitted into the panel recess, the protective panel is substantially flush with the housing surface.

  According to the above configuration, the protective panel and the surface of the housing are substantially flush with each other, so it is difficult to insert tools during repair or recycling, and the protective panel is extremely difficult to peel off. Since it becomes soft, it becomes easy to peel off the protective panel by, for example, sandwiching a tool.

  In the fifth invention, one of the two types of adhesive materials is adhered to the surface of the display unit, and the other is adhered to the bottom surface of the panel recess.

  According to said structure, a protection panel is reliably affixed and it becomes difficult to peel by selecting an appropriate adhesion material with respect to a different to-be-adhered body.

  In 6th invention, the adhesive material adhere | attached on the said display part surface is thicker than the adhesive material adhere | attached on the said recessed part bottom face for panels.

  According to the above configuration, even when the display surface is deeper than the bottom surface of the concave portion for the panel, the height between the display portion surface and the bottom surface of the concave portion for the panel depends on the thickness of the adhesive material adhered to the display surface. Since the gap can be eliminated, the sticking property of the protective panel is improved, and the protective panel is prevented from peeling off.

  In the seventh invention, the display unit is a liquid crystal display.

  According to the above configuration, since the liquid crystal display is inexpensive and has a long lifetime, the housing structure of a low-cost and long-life display device having a protective panel that is difficult to peel off due to thermal expansion even under high temperature and high humidity conditions Is obtained.

  In the eighth invention, the display section is composed of an organic EL display.

  According to the above configuration, the organic EL display emits self light, consumes less power, has a wider viewing angle than a liquid crystal display, and does not require a backlight, and thus can be thinned. For this reason, even in a high temperature and high humidity state, it is possible to obtain a compact housing structure for a display device that includes a protective panel that does not easily peel off due to thermal expansion.

  In a ninth invention, a mobile device includes the housing structure of the display device according to any one of the above inventions.

  According to the above configuration, even if the protective panel is fixed with an adhesive material, even under high temperature and high humidity conditions, it is difficult to peel off due to thermal expansion, so it is not necessary to use fastening parts and the display device can be thinned. A compact and good-looking mobile device can be obtained.

  In a tenth aspect of the invention, a mobile phone is provided with the housing structure of the display device according to any one of the above aspects.

  According to the above configuration, a compact and high-quality mobile phone with good merchandise can be obtained.

  As described above, according to the present invention, the adhesive material for attaching the protective panel is made of two types of adhesive materials (one is a thermosetting adhesive material and the other is a thermoplastic adhesive material). Even in a high humidity environment, the protective panel can be prevented from peeling off due to thermal expansion.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows an exploded view of a housing structure of a display device according to an embodiment of the present invention. FIG. 2 shows a cross-sectional view of the housing structure of the display device. FIG. 3 shows a front view and a rear view of the liquid crystal protection panel.

  As shown in FIG.1 and FIG.2, the display apparatus of this embodiment is provided in the upper housing | casing 1 of the mobile telephone (not shown whole). The upper housing 1 includes a front side cabinet 2 and a back side cabinet 3. These front-side cabinet 2 and back-side cabinet 3 are made of engineering plastic resin such as ABS (acrylonitrile, butadiene, styrene), PC (polycarbonate), etc., and a metal reinforcing plate 4 made of magnesium frame is sandwiched between them. Yes. A rectangular display window 5 is opened at the center of the front-side cabinet 2, and a panel recess 6 into which the liquid crystal protection panel 11 is fitted is formed on the outer periphery of the display window 5. .

  A liquid crystal backlight 7 is fitted into the metal reinforcing plate 4, and a liquid crystal panel 8 as a display unit is fixed to the surface of the liquid crystal backlight 7 with a double-sided tape 9 for fixing a liquid crystal panel. The surface of the peripheral part of the liquid crystal panel 8 is covered with glass. The surface side of the central portion of the liquid crystal panel 8 is covered with PVOH (polyvinyl alcohol). The front side cabinet 2 and the back side cabinet 3 are fixed to each other with screws 10. In a state where the liquid crystal panel 8 is exposed from the display unit window 5, the liquid crystal protection panel 11 is fitted into the panel recess 6 from above and fixed with two kinds of adhesive materials.

  As shown in FIG. 3, the liquid crystal protection panel 11 is made of tempered glass or acrylic resin, and a transparent portion 11 a is formed in the region of the central liquid crystal panel 8. A thermosetting adhesive material 12 is applied to the outer back surface of the transparent portion 11a in a rectangular frame shape, and a thermoplastic adhesive material 13 is applied to an outer portion of the thermosetting adhesive material 12. For example, the thermosetting adhesive material 12 is made of an epoxy adhesive. The thermoplastic pressure-sensitive adhesive material 13 is made of an acrylic adhesive, a urethane adhesive, or a double-sided tape to which these are applied. Each of the adhesive materials 12 and 13 may be a paste or a film. If an adhesive material processed as a double-sided tape is used, the thickness can be easily adjusted and the pasting operation is easy.

  As shown in FIG. 2, the adherend of the adhesive materials 12 and 13 of the liquid crystal protection panel 11 is the liquid crystal panel 8 of the thermosetting adhesive material 12, and the thermoplastic adhesive material 13 is used for the panel of the front side cabinet 2. This is the bottom surface of the recess 6. The surface of the liquid crystal panel 8 is deeper than the bottom surface of the panel recess 6. For this reason, the thermosetting adhesive material 12 is thicker than the thermoplastic adhesive material 13.

-Action-
Next, the effect | action of the housing structure of the display apparatus concerning this embodiment is demonstrated.

  The surface of the peripheral portion of the liquid crystal panel 8 covered with glass is bonded to the liquid crystal protection panel 11 made of tempered glass or acrylic resin by hydrogen bonding with the thermosetting adhesive material 12 made of epoxy adhesive.

  The surface side cabinet 2 made of an engineering plastic resin is bonded to the liquid crystal protection panel 11 by an intermolecular force by the thermoplastic adhesive material 13 made of an acrylic adhesive or a urethane adhesive.

  In this way, by using a combination in which the adhesive force of the adhesive materials 12 and 13 is increased, the liquid crystal protection panel 11 can be prevented from floating.

  When the environmental protection condition is high temperature and high humidity, when the liquid crystal protection panel 11 tries to stretch at temperature and humidity, the outer adhesive material is the thermoplastic adhesive material 13, so that it is softened by heat and the elongation stress is reduced. Can escape to the outside. Further, since the inner pressure-sensitive adhesive material is the thermosetting pressure-sensitive adhesive material 12, it is not softened by heat, and the inward elongation stress can be prevented by an adhesive force, and the liquid crystal protection panel 11 can be prevented from floating. it can.

  By making the thermosetting adhesive material 12 thicker than the thermoplastic adhesive material 13, the gap in height between the surface of the liquid crystal panel 8 and the bottom of the panel recess 6 can be eliminated. The floating of the panel 11 can be suppressed.

  When the protective panel 11 is fitted into the panel recess 6, the protective panel 11 and the upper housing 1 surface are substantially flush with each other. For this reason, it is difficult to insert a tool or the like at the time of repair or recycling, and the protective panel 11 is extremely difficult to peel off. However, since the thermoplastic adhesive material 13 is in the outer peripheral portion of the liquid crystal protection panel 11, the adhesive material is easily deformed by applying heat during repair or recycling, so the peripheral portion of the liquid crystal protection panel 11 is peeled off. It becomes easy, and the liquid crystal protection panel 11 can be easily peeled off by inserting a tool by using it as a handle.

-Effect of the embodiment-
Therefore, according to the housing structure of the display device according to the present embodiment, the adhesive material for attaching the protective panel 11 is divided into two types of adhesive materials (the thermosetting adhesive material 12 on the inside and the thermoplastic adhesive material on the outside). 13), it is possible to prevent the protective panel 11 from being peeled off in a high temperature and high humidity environment.

(Other embodiments)
The present invention may be configured as follows with respect to the above embodiment.

  That is, in the above embodiment, as shown in FIG. 4, in order to eliminate the height gap between the surface of the liquid crystal panel 8 and the bottom of the panel recess 6, the liquid crystal panel 8 and the liquid crystal protection panel 11 are disposed. An impact cushioning cushion 20 may be sandwiched. In this case, the thermosetting adhesive material 12 is bonded to the cushion 20 and the surface side cabinet 2, and the thermoplastic adhesive material 13 is bonded to the surface side cabinet 2. Accordingly, the liquid crystal protection panel 11 can be prevented from floating even in a high-temperature and high-humidity environment as in the above embodiment.

  In the above embodiment, the display unit is the liquid crystal liquid crystal panel 8, but it may be an organic EL panel. The organic EL panel emits light by itself, consumes less power, has a wider viewing angle than the liquid crystal panel 8, and does not require a backlight, and thus can be thinned.

  In the above embodiment, the display device is provided in the mobile phone. However, the display device may be a mobile device provided with a display device such as a PC, a mobile tool, an electronic dictionary, a calculator, a copying machine, a PHS, or a PDA. Further, the present invention can be applied not only to portable devices but also to non-portable display devices that are placed on a desk.

  In addition, the above embodiment is an essentially preferable illustration, Comprising: It does not intend restrict | limiting the range of this invention, its application thing, or a use.

It is an exploded view of the housing structure of the display device according to the embodiment of the present invention. It is sectional drawing of the housing structure of a display apparatus. The liquid crystal protection panel is shown, (a) is a front view and (b) is a rear view. FIG. 3 is a view corresponding to FIG. 2 according to another embodiment.

Explanation of symbols

1 Upper housing (housing)
5 Display window 6 Recessed panel 8 Liquid crystal panel (display)
11 Protective Panel 12 Thermosetting Adhesive Material 13 Thermoplastic Adhesive Material

Claims (10)

In the housing structure of a display device to which a protective panel for protecting the display unit is attached,
A case structure of a display device, wherein a part of the protective panel is fixed to the case of the display device, part of which is a thermosetting adhesive material and the other part is a thermoplastic adhesive material. The housing structure of the display device according to claim 1,
The inside of the protective panel is fixed to the casing of the display device with a thermosetting adhesive material, and the outer portion of the thermosetting adhesive material is fixed to the casing of the display device with a thermoplastic adhesive material. A display device housing structure. The housing structure of the display device according to claim 2,
The housing is
A display window for exposing the display section;
A housing structure for a display device, comprising: a panel recess provided on an outer periphery of the display portion window and into which the protective panel is fitted. The housing structure of the display device according to claim 3,
A housing structure of a display device, wherein the protective panel and the housing surface are substantially flush with each other when the protective panel is fitted into the panel recess. In the housing structure of the display device according to claim 3 or 4,
A housing structure of a display device, wherein one of two kinds of adhesive materials is adhered to the surface of the display portion, and the other is adhered to the concave portion for the panel. The housing structure of the display device according to claim 5,
The housing structure of a display device, wherein the adhesive material adhered to the surface of the display unit is thicker than the adhesive material adhered to the bottom surface of the panel recess. The housing structure of the display device according to any one of claims 1 to 6,
A housing structure of a display device, wherein the display unit includes a liquid crystal display. The housing structure of the display device according to any one of claims 1 to 6,
The housing structure of the display device, wherein the display unit is composed of an organic EL display.   A portable device comprising the housing structure of the display device according to claim 1. The mobile device according to claim 9, wherein the mobile device is a mobile phone.

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