JP2010157957A - Display and portable terminal set equipped with display - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display which is easy to view even outdoors by reducing reflection of outdoor lights and further improves visibility by making a transparent resin sheet hard to peel off at end parts of the display element, and to provide a portable terminal set using the same. <P>SOLUTION: A protective cover 1 and the display element 2 are glued with an elastic transparent resin sheet 6 under the condition that the outer frame 5 of a display frame 3 in which the display element 2 is housed is lower in height than the surface of the display element 2. Thereby, the transparent resin sheet 6 becomes hard to peel off at the end parts of the display element 2, achieving a display easy to view even outdoors and a portable terminal set equipped with the display. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a display device such as an LCD (Liquid Crystal Display Element) and a mobile terminal device such as a mobile phone including the display device.

  When a mobile terminal device such as a mobile phone is used outdoors, it is difficult to see because external light is reflected by a protective cover of a display device (liquid crystal display or the like).

  FIG. 5 shows an example of a cross-sectional structure of a display element and a protective cover fixed to a casing of a conventional portable terminal device.

  In FIG. 5, the portable terminal device includes a housing 7, a display element 2 such as an LCD (liquid crystal display element), a display device frame 3 including a backlight 4, and a transparent protective cover 1 made of a material such as acrylic. Is provided.

  The display element 2 is fixed to the display device frame 3 using a double-sided tape 9. Next, the display device frame 3 is fixed to the housing 7 of the portable terminal device using the double-sided tape 9. Furthermore, the outer periphery of the protective cover 1 is fixed to the housing 7 of the mobile terminal device using a double-sided tape 9.

  The display device frame 3 has an outer frame portion 5 that covers the outer peripheral side surface of the LCD 2, and defines a relative position between the LCD 2 and the display device frame 3. The height of the outer frame of the display device frame 3 is slightly higher than the height of the LCD surface when the LCD is placed, so that the light from the backlight is prevented from leaking from the outer periphery of the LCD and the external force is directly applied to the LCD surface. The structure is difficult to add.

  The outer periphery of the back surface of the protective cover 1 is provided with a printing frame 8 that does not allow light to pass therethrough so that unnecessary light leaking from the periphery of the LCD does not leak to the outside.

  An air layer exists between the surface of the display element 2 such as an LCD and the back surface of the protective cover 1, and even if an external force is applied to the protective cover 1, the protective cover comes into contact with the surface of the display element 2 such as the LCD. The structure is such that stress is not easily applied to the surface of the display element 2.

  However, in such a conventional configuration, an air layer exists between the display element 2 and the protective cover 1. For this reason, there are at least three light reflecting surfaces, that is, the surface of the display element 2 and the front side and the back side of the protective cover 1. .

Therefore, in order to solve this problem, the refractive index (about 1.5) of the air layer between the display device of the portable terminal device and the back surface of the protective cover made of a material such as acrylic is almost the same as that of acrylic or the like. It is known to reduce light reflection on the display device surface and the back surface of the protective cover by filling the transparent resin. For example, by using a liquid material as the transparent resin to be filled, it is possible to realize bonding with less stress on a liquid crystal display element (LCD) (see, for example, Patent Document 1). As another example, it is also known that a protective cover and an LCD are bonded together in a vacuum via a transparent resin sheet (see, for example, Patent Document 2).
JP-A-5-011239 JP-A-7-1114010

  FIG. 6 shows a cross-sectional structure diagram of the peripheral portion of the display device when the air layer between the conventional protective cover and the LCD is filled with the transparent resin sheet 6. Since the transparent resin has elasticity, the gap between the protective cover and the LCD can be filled without any gap if the variation in the gap between the protective cover and the LCD is about several hundred μm (microns) or less.

  FIG. 7 is an enlarged cross-sectional view of the protective cover and the end portion of the LCD. The printing frame 8 provided on the back surface of the outer peripheral portion of the protective cover 1 is generally several tens of microns thick. Accordingly, the gap between the protective cover and the LCD in the portion b of FIG. 7 is narrower than the portion a. For this reason, a larger pressure is applied to the transparent resin sheet 6 in the part b than in the vertical direction. That is, since compressive stress is applied to the outer peripheral portion of the transparent resin sheet, the transparent resin sheet 6 and the display element 2 such as an LCD, and the adhesive surface between the transparent resin sheet 6 and the protective cover 1 are difficult to peel off. ing.

  Furthermore, since the height of the outer frame portion 5 of the display device frame 3 is above the surface of the display element 2 such as an LCD, the gap in the portion c in FIG. 7 is further narrower than b. For this reason, the portion c in FIG. 7 is more compressed than the portion b in FIG. Therefore, the transparent resin sheet 6 between the outer frame part 5 of the part c and the protective cover 1 is further difficult to peel off.

  However, the above conventional structure has the following problems. That is, since the portion c of the transparent resin sheet 6 is thinner than the portion b, the resin at the boundary between b and c is deformed. Then, a force is applied in the directions of arrows A and B in FIG. 7, and when left for a long period of time, the adhesive surface between the end portion d of the display element 2 such as an LCD and the transparent resin sheet 6 is likely to peel off (that is, the LCD or the like The transparent resin sheet 6 is easily peeled off from the end of the display element 2 such as an LCD at the end of the display element 2). When the transparent resin sheet 6 at the end of the display element 2 such as an LCD is peeled off, the reflection of external light increases, so that there is a problem that it is difficult to see a display device such as an LCD outdoors.

  In order to solve the conventional problems, the present invention provides a display device frame, a display element accommodated in the display device frame, a protective cover for protecting the display element, and a resilient and adhesive both sides. A transparent resin sheet, wherein the display element and the protective cover are bonded together with the transparent resin sheet, and the display device frame covers at least a part of a side surface of the display device The outer frame portion is a display device whose height is lower than the height of the display element.

  The present invention also includes a display device frame, a display element housed in the display device frame, a protective cover that protects the display element, and a transparent resin sheet that is elastic and has adhesiveness on both sides. The display element and the protective cover are bonded with the transparent resin sheet, and the display device frame has an outer frame portion that covers at least a part of a side surface of the display device, and the outer frame portion And the protective cover. The display device has a distance greater than the distance between the display element and the protective cover.

  The present invention also includes a display device frame, a display element housed in the display device frame, a protective cover that protects the display element, and a transparent resin sheet that is elastic and has adhesiveness on both sides. The display element and the protective cover are bonded with the transparent resin sheet, and the display device frame has an outer frame portion that covers at least a part of a side surface of the display device, and the outer frame portion And the transparent resin sheet.

  Further, according to the present invention, the protective cover has a printing frame on the back surface of the outer peripheral portion, and the size of the inner periphery of the printing frame is smaller than the size of the outer periphery of the display element and is larger than the inner periphery of the printing frame. The display element is arranged so that the outer periphery is on the outside.

  Further, according to the present invention, the protective cover has a printing frame on the back surface of the outer peripheral portion, and at the outer peripheral portion of the display element, at least a part of the printing frame and the display element overlap each other in the vertical direction. It was decided to include those arranged in

  Further, according to the present invention, the protective cover has a printing frame on the back surface of the outer peripheral portion, and the transparent resin sheet is at least partially between the printing frame and the display element in the outer peripheral portion of the display element. It was decided to include what was sandwiched between.

  In addition, the present invention includes a display element, a protective cover for protecting the display element, and a transparent resin sheet having elasticity and both surfaces being adhesive, and the display element and the protective cover include: The display device is bonded with the transparent resin sheet, and the size of the outer periphery of the transparent resin sheet is substantially equal to the outer periphery size of the protective cover.

  According to the display device and the mobile terminal device including the display device of the present invention, the transparent resin sheet reduces the reflection of external light so that it can be easily seen outdoors and the transparent resin sheet is separated from the display element at the end of the display element. By making it difficult to peel off, the visibility can be further improved.

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

(Embodiment 1)
FIG. 1 shows a cross-sectional structure diagram of a mobile terminal device according to Embodiment 1 of the present invention having a display device in which a protective cover and a display element are bonded using a transparent resin sheet. In addition, as a portable terminal device having a display device, for example, a mobile phone, a PHS, a digital still camera, and the like can be considered.

  A backlight 4 is built in the display device frame 3 made of a plastic material or the like. An outer frame 5 is provided on the outer periphery of the display device frame 3, and the display element 2 (liquid crystal element (LCD)) can be accommodated inside the outer frame 5. The LCD and the display device frame 3 are fixed with a double-sided tape 9 or an adhesive. The outer frame portion 5 of the display device frame 3 defines a relative position between the LCD and the display device frame 3.

  Here, the outer frame portion 5 is slightly lower than the height of the LCD surface when the LCD is accommodated in the display device frame 3. This is a point that is a point of the display device frame of the first embodiment of the present invention, which is different from the conventional display device frame. However, if the outer frame portion 5 is made too low, the backlight light leakage prevention function, which is one of the original functions of the outer frame portion 5, is deteriorated. Therefore, the outer frame portion 5 is not lowered from several tens to several hundreds of micrometers (micrometers) or more. It is desirable.

  Next, the display element 2 (LCD) fixed to the display device frame 3 and the protective cover 1 are bonded together via the transparent resin sheet 6. Here, the protective cover 1 is a transparent cover made of a material such as acrylic. The protective cover 1 is used for protecting the display element 2. The transparent resin sheet 6 is made of a resin having adhesiveness on both sides, and for example, bonding can be realized without mixing bubbles by bonding in a vacuum. A bonding method in vacuum is described in Patent Document 2, for example. Here, the display device frame 3, the display element 2 such as an LCD, the protective cover 1, and the transparent resin sheet 6 that is elastic and has adhesiveness on both sides are provided. 2 and the protective cover 1 bonded together with the transparent resin sheet 6 are referred to as a display device. Here, as the transparent resin sheet 6, a transparent resin material having a refractive index (about 1.5) that is substantially the same as the refractive index (about 1.5) of the protective cover 1 (acrylic or the like) is used. It is possible to reduce the light reflection on the front surface and the light reflection on the back surface of the protective cover 1. As a result, visibility can be improved.

  In this state, the points of the display device frame according to the first embodiment of the present invention will be described again. That is, as shown in FIG. 1, the display device frame 3 has an outer frame portion 5 that covers at least a part of the outer peripheral side surface of the display device. Further, in this way, the display element 2 is accommodated in the display device frame 3, and further, the display element 2 and the protective cover 1 are bonded to each other with the transparent resin sheet 6. The distance is longer than the distance between the display element 2 and the protective cover 1. In other words, the display element 2 is accommodated in the display device frame 3, and the display element 2 and the protective cover 1 are bonded to each other with the transparent resin sheet 6, and between the outer frame portion 5 and the transparent resin sheet 6. Due to the presence of space, they are not in contact.

  By adopting such a configuration, the display device and the mobile terminal device according to the first embodiment can make it difficult to peel the transparent resin sheet 6 from the display element 2 at the end of the display element 2 (about this point). This will be described later with reference to FIG. As a result, an increase in reflection of external light due to the peeling off of the transparent resin sheet 6 can be suppressed, so that the visibility can be further improved.

  Next, the double-sided tape 9 is used to fix the outer peripheral portion of the protective cover 1 outside the LCD attached to the back surface of the protective cover 1 and the frame of the casing 7 of the mobile terminal device. Here, an adhesive may be used instead of the double-sided tape 9. The back surface (lower part) of the display device frame 3 and the housing 7 of the portable terminal device are not fixed with a double-sided tape or the like as in the past. When the back surface of the display device frame 3 and the housing 7 are fixed, when the thickness of the transparent resin sheet 6 or the housing 7 of the display device or the mobile terminal device becomes thin due to manufacturing variations, tensile stress is applied to the transparent resin sheet 6. This is because there is a possibility of joining and it becomes a factor of peeling.

  In order to prevent the tensile stress from being applied, as shown in FIG. 3, a stress cushioning material 10 such as a sponge may be inserted between the back surface of the display device frame and the housing.

  FIG. 2 shows an enlarged cross-sectional structure of the end portion of the display device. The printing frame 8 on the back surface of the protective cover 1 has an overlapping portion (b) with the display element 2 (LCD), and blocks the backlight 4 light leaking from the LCD end.

  The thickness of the printing frame 8 is approximately several tens of μm, the thickness of the transparent resin sheet 6 is thinner than the portion (a) where the printing frame 8 is not present, and the resin in the portion (b) is subjected to compressive stress. Yes. For this reason, the transparent resin sheet 6 on the outer peripheral portion of the LCD is difficult to peel off. That is, the presence of the printing frame 8 and the transparency of the transparent resin sheet prevent the transparent resin sheet from becoming difficult to peel off from the end.

  The transparent resin sheet 6 is slightly larger than the LCD size, and a portion (c) of the transparent resin sheet 6 exists above the outer frame portion 5 of the display device frame 3. Here, in the conventional configuration, since the height of the outer frame portion 5 was higher than the LCD surface, the portion c of the transparent resin sheet 6 was subjected to compressive stress by the outer frame portion 5 and the printing frame 8. On the other hand, in the configuration of the first embodiment of the present invention, the outer frame portion 5 is lower than the surface of the display element 2 such as an LCD, and therefore is not in contact with the transparent resin sheet 6. In the portion c (position where the outer frame portion 5 and the transparent resin sheet 6 overlap in the vertical direction), the transparent resin sheet 6 has a structure in which no stress is applied. With this configuration, there is no force to peel off the adhesive surface between the transparent resin sheet 6 and the display element 2 at the end of the display element 2 such as an LCD (portion b in FIG. 2), and it can be made difficult to peel off.

  Furthermore, at the end of the display element 2 such as an LCD (portion b in FIG. 2), the printing frame 8 and the display element 2 receive a compressive stress, and the adhesive force becomes strong, and it can be made difficult to peel off. In other words, in other words, the protective cover 1 has the printing frame 8 on the back surface of the outer peripheral portion, and at least a part of the printing frame 8 and the display element 2 is vertically above and below the outer peripheral portion of the display element 2. It can also be said that they are arranged at positions overlapping in the direction. Further, it can be said that at least a part of the transparent resin sheet 6 is sandwiched between the printing frame 8 and the display element 2 in the outer peripheral portion of the display element 2. In any case, since the increase in reflection of external light due to the transparent resin sheet 6 peeling off from the display element 2 can be suppressed as a result, visibility can be further improved.

  As described above, the display device according to the first embodiment and the mobile terminal device including the display device can be easily seen outdoors by reducing reflection of external light, and the transparent resin sheet 6 is formed at the end of the display element 2. By making it difficult to peel off, the visibility can be further improved.

  As another method for making the transparent resin sheet 6 difficult to peel off, the size of the display element 2 such as an LCD and the transparent resin sheet 6 are made the same, that is, the transparent resin sheet 6 does not protrude outside the LCD. There is a method of eliminating the portion c in FIG. Thereby, even if the outer frame part 5 is higher than the LCD surface, the transparent resin sheet 6 is not stressed. However, since the bonding accuracy between the protective cover and the transparent resin sheet 6 and the transparent resin sheet 6 and the display element 2 such as an LCD is required to be as high as several tens of μm, the manufacturing apparatus becomes expensive, or Another problem occurs, such as a decrease in manufacturing yield.

  In the above description of the first embodiment, the case where the display element 2 is an LCD has been described. However, the same applies to other display elements (such as an organic EL display and a plasma display) in which a display device frame is present.

(Embodiment 2)
FIG. 4 is a cross-sectional structure diagram of the display device according to the second embodiment. The double-sided tape 9 for fixing the protective cover 1 and the casing 7 of the first embodiment is replaced with the transparent resin sheet 6 in the second embodiment. Since other configurations are the same as those of the first embodiment, description thereof is omitted.

  After fixing the display device frame 3 incorporating the backlight 4 and the display element 2 such as an LCD with a double-sided tape 9, the protective cover 1 and the surface of the display element 2 such as an LCD are bonded together with a transparent resin sheet 6. . The bonding method is described in Patent Document 2, for example. The transparent resin sheet 6 is substantially the same as the outer periphery size of the protective cover 1, and the transparent resin sheet 6 is also present on the back surface of the protective cover 1 outside the outer periphery of the LCD. The transparent resin sheet 6 is used to fix the outer periphery of the back surface of the protective cover 1 and the casing frame of the mobile terminal device.

  In the second embodiment, instead of the double-sided tape on the outer periphery of the back surface of the protective cover of the first embodiment, a part of the transparent resin sheet is substituted, so that the double-sided tape becomes unnecessary in addition to the effects in the first embodiment. The effect that the number of parts can be reduced is obtained.

  The display device of the present invention and the portable terminal device equipped with the same make it easier to see outdoors by reducing the reflection of external light with the transparent resin sheet, and the transparent resin sheet peels off from the display element at the edge of the display element. The visibility can be further improved by making it difficult. For this reason, it is useful as a portable terminal device provided with a display apparatus and a display apparatus.

Sectional structure figure of the display apparatus of the portable terminal device of Embodiment 1 of this invention FIG. 3 is an enlarged cross-sectional structure diagram of an end portion of the display device according to the first embodiment of the present invention. Sectional structure figure of the display apparatus of the portable terminal device of Embodiment 1 of this invention Sectional structure figure of the display apparatus of the portable terminal device of Embodiment 2 of this invention Cross-sectional structure diagram of a display device of a conventional portable terminal device Cross-sectional structure diagram of a conventional display device with a transparent resin sheet of a portable terminal device Enlarged cross-sectional structure diagram of the end of a conventional mobile terminal device display device with a transparent resin sheet

DESCRIPTION OF SYMBOLS 1 Protective cover 2 Display element 3 Display apparatus frame 4 Backlight 5 Outer frame part 6 Transparent resin sheet 7 Case 8 Printing frame 9 Double-sided tape 10 Stress buffer

Claims (12)

A display device frame;
A display element housed in the display device frame;
A protective cover for protecting the display element;
A transparent resin sheet that is elastic and has adhesiveness on both sides,
The display element and the protective cover are bonded with the transparent resin sheet,
The display device frame has an outer frame portion that covers at least a part of a side surface of the display device,
The outer frame portion is lower in height than the display element. A display device frame;
A display element housed in the display device frame;
A protective cover for protecting the display element;
A transparent resin sheet that is elastic and has adhesiveness on both sides,
The display element and the protective cover are bonded with the transparent resin sheet,
The display device frame has an outer frame portion that covers at least a part of a side surface of the display device,
The display device, wherein a distance between the outer frame portion and the protective cover is greater than a distance between the display element and the protective cover. A display device frame;
A display element housed in the display device frame;
A protective cover for protecting the display element;
A transparent resin sheet that is elastic and has adhesiveness on both sides,
The display element and the protective cover are bonded with the transparent resin sheet,
The display device frame has an outer frame portion that covers at least a part of a side surface of the display device,
The display device in which the outer frame portion and the transparent resin sheet are not in contact with each other. The protective cover has a printing frame on the back surface of the outer periphery,
The size of the inner periphery of the printing frame is smaller than the size of the outer periphery of the display element,
The display device according to any one of claims 1 to 3, wherein the display device is disposed such that an outer periphery of the display element is on an outer side than an inner periphery of the print frame. The protective cover has a printing frame on the back surface of the outer periphery,
4. The display device according to claim 1, wherein at least a part of the print frame and the display element overlap each other in a vertical direction in an outer peripheral portion of the display element. The protective cover has a printing frame on the back surface of the outer periphery,
The display device according to claim 1, wherein at least a part of the transparent resin sheet is sandwiched between the printing frame and the display element at an outer peripheral portion of the display element. . A display element;
A protective cover for protecting the display element;
A transparent resin sheet that is elastic and has adhesiveness on both sides,
The display element and the protective cover are bonded with the transparent resin sheet,
The display device, wherein the outer peripheral size of the transparent resin sheet is substantially equal to the outer peripheral size of the protective cover. The display device according to claim 1, wherein the display element is a liquid crystal display element. The display device according to claim 1, wherein the display device frame includes a backlight. A portable terminal device comprising the display device according to any one of claims 1 to 9. The portable terminal device according to claim 10, wherein an outer peripheral portion of a back surface of the protective cover and a casing of the portable terminal device are fixed with a double-sided tape. The mobile terminal device according to claim 10, further comprising a stress buffer material disposed between a back surface of the display device and a housing of the mobile terminal device.

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