JP2010015189A - Electronic device including liquid crystal display device - Google Patents

Abstract

An electronic apparatus including a liquid crystal display device capable of realizing a structure capable of preventing the liquid crystal panel from expanding and contacting the liquid crystal panel and the liquid crystal module without increasing the size of the device is provided. To do.
An electronic apparatus 20 including a liquid crystal display device 29 includes the liquid crystal display device 29 including liquid crystal modules 37 and 38 and a liquid crystal panel 33 provided above the liquid crystal modules 37 and 38. The panel 33 has a degree of freedom of extension in the width direction of the liquid crystal panel 33.
[Selection] Figure 6

Description

  The present invention relates to an electronic device including a liquid crystal display device, and more specifically to an electronic device such as a portable information terminal including a liquid crystal display device including a liquid crystal panel and a backlight assembly.

  A liquid crystal display device is thin and lightweight, can be driven at a low voltage, and has low power consumption. Therefore, a portable information terminal such as a mobile phone, PDA (Personal Digital Assistants), or a portable PC such as a notebook PC (personal computer). It is widely used in display units of various electronic devices such as desk-type PCs or televisions.

  FIG. 1 shows a front view of a mobile phone provided with a conventional liquid crystal display device.

  A mobile phone 10 shown in FIG. 1 includes a fixed case 1 and a movable case 3 connected to the fixed case 1 through a hinge 2 so as to be opened and closed. FIG. 1 shows a state in which the movable case 3 of the mobile phone 10 is opened.

  The stationary case 1 is flat and has a substantially rectangular shape. A plurality of push buttons 5, 6, and 7 are provided on the inner side surface 4 of the fixed case 1. A liquid crystal display device 9 and the like are provided on the inner side surface 8 of the movable case 3.

  FIG. 2 shows a cross-sectional view of the liquid crystal display device 9 shown in FIG.

  As shown in FIG. 2, the liquid crystal display device 9 includes a front case 11, a rear case 12, a liquid crystal (LCD: Liquid Crystal Display) panel 13, and the like.

  The front case 11 is a molded product made of, for example, a resin or a magnesium alloy. The lower surface of the front case 11 is joined to the upper end of the rear case 12 by claw fitting or screwing.

  A liquid crystal panel 13 mounting surface 11a is formed on the upper portion of the front case 11, and the liquid crystal panel 13 made of, for example, acrylic polymer polymethyl methacrylate (PMMA) is disposed on the liquid crystal panel mounting surface 11a with a double-sided tape 14 interposed therebetween. Is installed.

  FIG. 3 shows an enlarged portion A surrounded by a dotted line in FIG. As shown in FIG. 3, the liquid crystal panel mounting surface 11 a is a flat surface substantially parallel to the horizontal plane, and the outer peripheral side portion of the liquid crystal panel 13 is fixed on the liquid crystal panel mounting surface 11 a via a double-sided tape 14. Further, no gap is formed between the end face of the liquid crystal panel 13 and the inner side surface of the upper portion of the front case 11 except for a slight gap due to dimensional tolerance.

  Referring again to FIG. 2, a liquid crystal module holder 16 having a concave shape with a substrate 15 attached to the lower surface is provided on the inner portion of the front case 11. In addition, although electronic components, such as a chip capacitor, are mounted on the board | substrate 15, illustration is abbreviate | omitted in FIG. Backlight assemblies 17 and 18 are disposed in a recessed manner in the liquid crystal module holder 16.

  The upper edge surface of the liquid crystal module holder 16 is in contact with the lower surface of the upper portion of the front case 11, and the liquid crystal module holder 16 supports the front case 11. Further, a dustproof packing 19 of a cushion member such as urethane foam rubber is provided on the upper edge portion of the backlight assembly 18, and the dustproof packing 19 is in contact with the lower surface of the liquid crystal panel 13. This structure prevents dust from adhering to the backlight assemblies 17 and 18.

  In addition, a light source support member that supports the light source at the corner portion of the chassis or the reflecting member is provided, a part of the reflector is interposed between the chassis and the light source support member, and the light source support member is guided at the front edge of the reflector. A backlight and a liquid crystal display device that restrict relative movement between the front surface of the light plate and the chassis in a parallel direction have been proposed (see Patent Document 1).

JP 2004-111153 A

  However, the structure shown in FIG. 2 has the following problems.

  That is, the liquid crystal panel 13 tends to expand in the direction indicated by the arrow in FIG. The length of expansion of the liquid crystal panel 13 due to expansion due to moisture absorption is determined based on the water absorption rate, plate thickness, etc., but the liquid crystal panel 13 is made of, for example, an acrylic polymer polymethyl methacrylate (PMMA). The water absorption is 0.3%.

  On the other hand, as described above, the outer peripheral portion of the lower surface of the liquid crystal panel 13 is fixed on the liquid crystal panel mounting surface 11 a via the double-sided tape 14. Further, no gap is formed between the end face of the liquid crystal panel 13 and the inner side surface of the upper portion of the front case 11 except for a slight gap due to dimensional tolerance.

  Therefore, the liquid crystal panel 13 tends to expand due to a temperature rise or moisture absorption, but the expansion in the horizontal direction (the direction indicated by the arrow in FIG. 4A) corresponding to the expansion is limited.

  As a result, as shown in FIG. 4B, the liquid crystal panel 13 is warped inward (downward in FIG. 4B) by the amount of expansion, and the lower surface of the liquid crystal panel 13 is the upper surface of the backlight assembly 18. May contact (interference). When the lower surface of the liquid crystal panel 13 comes into contact with the upper surface of the backlight assembly 18, it appears that water droplets have entered the gap between the liquid crystal panel 13 and the backlight assembly 18. As a result, the liquid crystal display device 9 must be repaired.

  In order to cope with such a problem, a sufficient gap is provided between the lower surface of the liquid crystal panel 13 and the upper surface of the backlight assembly 18 so that the lower surface of the liquid crystal panel 13 and the upper surface of the backlight assembly 18 do not contact even when the liquid crystal panel 13 expands. It is conceivable to make the size larger. However, in this aspect, the liquid crystal display device 9 and thus the size of the mobile phone 10 are increased.

  Therefore, the present invention has been made in view of the above points, and enlarges the apparatus with a structure capable of preventing the liquid crystal panel from expanding and contacting the liquid crystal panel and the backlight assembly. It is an object of the present invention to provide an electronic device including a liquid crystal display device that can be realized without any problem.

  According to an aspect of the present invention, there is provided an electronic apparatus including a liquid crystal display device, wherein the liquid crystal display device includes a backlight assembly and a liquid crystal panel provided above the backlight assembly, and the liquid crystal panel Provides an electronic device characterized in that it has a degree of freedom of extension in the width direction of the liquid crystal panel.

  In the width direction of the liquid crystal panel, a gap is formed between an end portion of the liquid crystal panel and an inner side surface of the frame that supports the liquid crystal panel from above, and the liquid crystal panel extends in the width direction. Alternatively, the end portion of the liquid crystal panel may not be in contact with the inner side surface of the frame.

  The liquid crystal display device includes a liquid crystal module holder that supports a lower portion of a backlight assembly, and the frame includes a liquid crystal panel contact portion and a holder connection portion that is bent with respect to the liquid crystal panel contact portion. The liquid crystal panel contact portion is in contact with both end portions of the upper surface of the liquid crystal panel, and the frame is provided so that the holder connection portion is connected to the liquid crystal module holder, and the end portion of the liquid crystal panel, The gap may be formed between the inner surface of the liquid crystal panel contact portion of the frame.

  A dustproof member may be provided between the liquid crystal panel contact portion of the frame and the upper surface of the liquid crystal panel.

  You may provide the elastic body which is a lower surface of the said liquid crystal panel, and supports an outer peripheral side rather than the substantially center part of the said liquid crystal panel.

  According to the present invention, there is provided a liquid crystal display device capable of realizing a structure capable of preventing the liquid crystal panel from expanding and contacting the liquid crystal panel and the backlight assembly without increasing the size of the device. An electronic device can be provided.

The front view of the mobile telephone provided with the conventional liquid crystal display device is shown. It is sectional drawing in the transversal direction of the liquid crystal display device shown in FIG. It is a figure which expands and shows the part A enclosed with the dotted line in FIG. It is sectional drawing for demonstrating the problem of the conventional liquid crystal display device. 1 is a perspective view of a mobile phone including a liquid crystal display device according to a first embodiment of the present invention. It is sectional drawing in the transversal direction of the liquid crystal display device shown in FIG. It is a figure which shows the state which the liquid crystal panel shown in FIG. 6 expanded. It is a figure which expands and shows the modification of the part A enclosed with the dotted line in FIG.

  Embodiments of the present invention will be described below.

  FIG. 5 is a perspective view of a mobile phone provided with the liquid crystal display device according to the first embodiment of the present invention.

  A mobile phone 20 shown in FIG. 5 includes a fixed side case 21 and a movable side case 23 connected to the fixed side case 21 via a hinge 22 so as to be freely opened and closed. FIG. 5 shows a state in which the movable case 23 of the mobile phone 20 is opened.

  The stationary case 21 is flat and has a substantially rectangular shape. A plurality of push buttons 25, 26, and 27 are provided on the inner side surface 24 of the fixed case 21. A liquid crystal display device 29 and the like are provided on the inner side surface 28 of the movable side case 23.

  FIG. 6 is a cross-sectional view of the liquid crystal display device 29 shown in FIG.

  As shown in FIG. 6, the liquid crystal display device 29 includes a liquid crystal display (LCD) panel 33, a frame 41 that is a plate-like member bent at a substantially right angle, a substrate 35, and a liquid crystal module holder 36. And backlight assemblies 37 and 38 disposed in the recess of the liquid crystal module holder 36, a dustproof packing 39, and the like.

  The liquid crystal panel 33 is made of, for example, an acrylic polymer polymethyl methacrylate (PMMA).

  The frame 41 includes a liquid crystal panel contact portion 41a and a holder connection portion 41b that extends from the liquid crystal panel contact portion 41a and is bent at a substantially right angle with respect to the liquid crystal panel contact portion 41a. The liquid crystal panel contact portion 41 a is located on both end portions of the upper surface of the liquid crystal panel 33 and in the vicinity thereof. The holder connecting portion 41b is, for example, fixed by a claw between a hole portion (not shown) formed in the holder connecting portion 41b and a claw portion (not shown) formed in a corresponding portion of the liquid crystal module holder 36. The liquid crystal module holder 36 is connected. That is, the frame 41 has a structure in which the upper surface of the liquid crystal panel 33 is pressed from above the liquid crystal panel 33 while being connected to the liquid crystal module holder 36.

  Although details will be described later, both ends of the liquid crystal panel 33 are separated from the inner surface of the holder connection portion 41b of the frame 41 by a predetermined length, for example, 0.2 mm, and the end portion of the liquid crystal panel 33 and the frame 41 are separated. A gap T is formed between the inner surface of the holder connecting portion 41b.

  The frame 41 having such a structure is made of, for example, stainless steel (SAS). By using a plate-like member made of stainless steel (SAS) as the frame 41, it is possible to prevent the thickness of the entire apparatus from increasing. However, as long as the upper surface of the liquid crystal panel 33 is pressed from above the liquid crystal panel 33, the constituent material of the frame 41 is not particularly limited, and a molded product made of resin, magnesium alloy, or the like may be used as the frame 41. Further, a molded product made of resin, magnesium alloy, or the like may be provided outside the frame 41 as an outer case.

  Below the liquid crystal panel 33, a liquid crystal module holder 36 having a concave shape with a substrate 35 attached to the lower surface is provided. The liquid crystal module holder 36 is made of, for example, stainless steel (SAS). However, the constituent material of the liquid crystal module holder 36 is not particularly limited, and a molded product made of a resin or a magnesium alloy may be used as the liquid crystal module holder 36.

  Note that electronic components such as chip capacitors are mounted on the substrate 35, but are not shown in FIG. Backlight assemblies 37 and 38 are arranged in a superimposed manner in the recess of the liquid crystal module holder 36.

  A dustproof packing 39, which is a cushion member such as foamed urethane rubber, is provided at the upper edge of the backlight assembly 38. The dustproof packing 39 is in contact with the lower surface of the liquid crystal panel 33, and the lower surface of the liquid crystal panel 33. Support. Such a structure prevents dust from adhering to the backlight assemblies 37 and 38.

  Under such a structure, the liquid crystal panel 33 tends to expand in a direction indicated by an arrow in FIG. The outer peripheral portion of the lower surface of the liquid crystal panel 33 is not fixed by the double-sided tape 14 (see FIG. 2), and the end of the liquid crystal panel 33 and the inner side surface of the holder connecting portion 41b of the frame 41 are separated from each other. The elongation of the liquid crystal panel 33 in the horizontal direction (the direction indicated by the arrow in FIG. 7A) is not limited. Therefore, such expansion in the planar direction can be absorbed, and the liquid crystal panel 33 does not warp even when expanded.

  In other words, the gap T formed between the end of the liquid crystal panel 33 and the inner surface of the holder connecting portion 41b of the frame 41 is such that the liquid crystal panel 33 is in the horizontal direction (the direction indicated by the arrow in FIG. 7A). The length is set such that a gap is formed between the end portion of the liquid crystal panel 33 and the inner side surface of the holder connecting portion 41b of the frame 41. As a result, even if the liquid crystal panel 33 expands, the degree of freedom is provided in the width direction of the liquid crystal panel 33 (the direction indicated by the arrow in FIG. 7A). It is possible to escape in the direction (the direction indicated by the arrow in FIG. 7A).

  Thus, in this example, the gap T is formed between the end of the liquid crystal panel 33 and the inner surface of the holder connecting portion 41b of the frame 41, and the holder connecting portion 41b of the frame 41 is connected to the liquid crystal module holder 36. The lower surface of the liquid crystal panel 33 is supported by the dustproof packing 39, and the upper surface of the liquid crystal panel 33 is pressed by the liquid crystal panel contact portion 41a of the frame 41.

  With this structure, the liquid crystal panel 33 does not warp even when it expands, and thus the lower surface of the liquid crystal panel 33 is prevented from contacting (interfering) with the upper surface of the backlight assembly 38.

  Further, since the liquid crystal panel 33 does not warp even when it expands, it is not necessary to increase the gap S between the lower surface of the liquid crystal panel 33 and the upper surface of the backlight assembly 38. Therefore, it is possible to avoid an increase in size of the liquid crystal display device 29 and the mobile phone 20.

  By the way, in the example shown in FIG. 6, the liquid crystal panel contact portion 41 a of the frame 41 is directly disposed on both ends of the upper surface of the liquid crystal panel 33 and in the vicinity thereof. However, the present invention is not limited to such a structure, and may be an embodiment shown in FIG. Here, FIG. 8 is an enlarged view showing a modification of the portion A surrounded by a dotted line in FIG.

  In the example shown in FIG. 8, the liquid crystal panel contact portion 41 a of the frame 41 is disposed on both end portions of the upper surface of the liquid crystal panel 33 and in the vicinity thereof via a dustproof member 50.

  As the dustproof member 50, a single-sided tape, a cushion member, etc. can be used, for example. By providing the dustproof member 50 between the liquid crystal panel contact portion 41a of the frame 41 and the liquid crystal panel 33, it is possible to reliably prevent dust from entering from the outside. Further, by using, for example, a single-sided tape or a cushion member as the dust-proof member 50, in addition to the above-mentioned dust-proof effect, even if the liquid crystal panel 33 expands, the horizontal direction of the liquid crystal panel 33 (arrow in FIG. 7A) The elongation in the direction indicated by) is not limited, and an effect of preventing the liquid crystal panel 33 from warping can be achieved.

  As described above, according to the structure of this example, the lower surface of the liquid crystal panel 33 is prevented from contacting (interfering) with the upper surface of the backlight assembly 38, so that water droplets are formed in the gap between the liquid crystal panel 33 and the backlight assembly 38. Occurrence of a phenomenon that appears to have entered can be prevented without increasing the gap between the lower surface of the liquid crystal panel 33 and the upper surface of the backlight assembly 38.

  6 shows a cross section in the short direction of the liquid crystal display device 29, but the present structure can also be applied to the longitudinal direction of the liquid crystal display device 29. FIG.

  Although the embodiment of the present invention has been described in detail above, the present invention is not limited to the specific embodiment, and various modifications and changes are within the scope of the gist of the present invention described in the claims. It can be changed.

  For example, in each of the above-described embodiments, the present invention has been described by taking a liquid crystal display device in a mobile phone as an example. However, a portable information terminal such as a PDA (Personal Digital Assistants) or a portable type such as a notebook PC (personal computer). The present invention can also be applied to a liquid crystal display device of another electronic device such as a PC, a desk-type PC, or a television.

Regarding the above description, the following items are further disclosed.
(Appendix 1)
An electronic device equipped with a liquid crystal display device,
The liquid crystal display device includes a backlight assembly and a liquid crystal panel provided above the backlight assembly,
The electronic apparatus according to claim 1, wherein the liquid crystal panel has a degree of freedom of extension in the width direction of the liquid crystal panel.
(Appendix 2)
An electronic device according to appendix 1,
In the width direction of the liquid crystal panel, a gap is formed between an end of the liquid crystal panel and an inner side surface of the frame that supports the liquid crystal panel by pressing it from above.
The electronic apparatus according to claim 1, wherein an end portion of the liquid crystal panel and an inner surface of the frame are not in contact with each other even when the liquid crystal panel extends in the width direction.
(Appendix 3)
The electronic device according to appendix 1 or 2,
The liquid crystal display device includes a liquid crystal module holder that supports a lower portion of a backlight assembly,
The frame includes a liquid crystal panel contact portion, and a holder connection portion that is bent with respect to the liquid crystal panel contact portion,
The frame is provided so that the liquid crystal panel contact portion is in contact with both end portions of the upper surface of the liquid crystal panel, and the holder connection portion is connected to the liquid crystal module holder,
The electronic apparatus, wherein the gap is formed between an end portion of the liquid crystal panel and an inner surface of the liquid crystal panel contact portion of the frame.
(Appendix 4)
The electronic device according to attachment 3, wherein
An electronic device, wherein a dustproof member is provided between the liquid crystal panel contact portion of the frame and an upper surface of the liquid crystal panel.
(Appendix 5)
An electronic device according to appendix 4, wherein
The electronic device, wherein the dustproof member is a single-sided tape.
(Appendix 6)
An electronic device according to appendix 4, wherein
The electronic device, wherein the dustproof member is a cushion member.
(Appendix 7)
The electronic device according to any one of appendices 1 to 6,
An electronic apparatus, comprising: an elastic body that is a lower surface of the liquid crystal panel and supports an outer peripheral side of a substantially central portion of the liquid crystal panel.

20 Cellular Phone 29 Liquid Crystal Display Device 33 Liquid Crystal Panel 36 Liquid Crystal Module Holder 37, 38 Backlight Assembly 39 Dustproof Packing 41 Frame 41a Liquid Crystal Panel Contact Portion 41b Liquid Crystal Module Holder Connection Portion 50 Dustproof Member

Claims (3)

An electronic apparatus comprising: a backlight assembly; a liquid crystal display device including a liquid crystal panel provided above the backlight assembly; and a frame that supports the liquid crystal panel by pressing it from above.
The liquid crystal display device includes a liquid crystal module holder that supports a lower portion of the backlight assembly,
The frame includes a liquid crystal panel contact portion, and a holder connection portion that is bent with respect to the liquid crystal panel contact portion,
The frame is provided so that the liquid crystal panel contact portion is in contact with both end portions of the upper surface of the liquid crystal panel, and the holder connection portion is connected to the liquid crystal module holder,
In the width direction of the liquid crystal panel, even if the gap is formed between an end portion of the liquid crystal panel and an inner surface of the liquid crystal panel contact portion of the frame, and the liquid crystal panel extends in the width direction, An electronic apparatus, wherein an end portion of the liquid crystal panel is not in contact with an inner surface of the frame. The electronic device according to claim 1,
An electronic device, wherein a dustproof member is provided between the liquid crystal panel contact portion of the frame and an upper surface of the liquid crystal panel. The electronic device according to claim 1 or 2,
An electronic apparatus, comprising: an elastic body that is a lower surface of the liquid crystal panel and supports an outer peripheral side of a substantially central portion of the liquid crystal panel.