JP5522732B2 - Support structure for liquid crystal display and electronic device - Google Patents

Description

  The present invention relates to a support structure for a liquid crystal display and an electronic apparatus.

  A rectangular plate-like liquid crystal display unit is provided in a housing of an electronic device such as a mobile phone. The liquid crystal display unit includes a liquid crystal display that is a display unit that encloses liquid crystal molecules and displays characters, images, and the like by applying a driving voltage. The liquid crystal display unit further includes a backlight unit that irradiates light to the liquid crystal display, and a rectangular frame-shaped backlight frame that surrounds the backlight unit and supports the liquid crystal display at its peripheral edge. The backlight frame has a function of protecting a liquid crystal display and a backlight portion that are easily damaged from an impact when the electronic device receives a large impact such as dropping.

  In recent years, with the downsizing of electronic devices such as mobile phones and the upsizing of liquid crystal displays, there has been a problem that the housing in which the liquid crystal display is arranged becomes large. If the thickness of the wall portion of the casing is reduced, the casing can be made smaller. However, in this case, the strength of the casing is insufficient, and the backlight frame may not be sufficiently protected from the impact of the liquid crystal display and the backlight unit. In addition, if the case is formed using a material having high strength such as fiber reinforced resin, the strength of the case can be ensured even if the thickness of the wall portion is reduced. However, in this case, there arises a problem that the cost of the casing itself and by extension, the electronic equipment increases.

  As a protection structure for such a liquid crystal display and a backlight unit, as shown in FIG. 10, a backlight frame 1 having a rectangular frame shape in plan view and a cross section of each side constituting the frame body being L-shaped. A technique is known in which the peripheral portion of the liquid crystal display 2 is placed on top and the outer peripheral surface of the liquid crystal display 2 is surrounded by the outer peripheral rib of the frame of the backlight frame 1 (see, for example, Patent Document 1). .

JP 2009-192769 A

  According to this technology, the strength of the wall of the casing is small, but the strength is secured, and the outer peripheral surface of the liquid crystal display is surrounded by the frame of the backlight frame. Can be effectively protected from. However, since the backlight frame surrounds the outer peripheral surface of the liquid crystal display, the backlight frame is necessarily larger than the outer periphery of the liquid crystal display. For this reason, the housing recess for housing the backlight frame becomes large, and the size of the housing increases. If the thickness of the wall portion is made equal to that of the conventional case in order to further increase the strength of the housing, there has been a problem that the size of the housing is further increased.

  The present invention has been made paying attention to such a problem, and while increasing the size of the liquid crystal display, in order to ensure the strength of the casing in which the liquid crystal display is disposed, the wall portion thereof is made of the same kind of material and A liquid crystal display support structure that can effectively protect the liquid crystal display from an impact such as dropping, and an electronic device having the support structure, without increasing the size of the casing even when formed with the same thickness The purpose is to provide equipment.

In order to achieve the above object, a support structure for a liquid crystal display according to the first aspect of the present invention comprises:
A housing having a housing recess and housing a liquid crystal display in the housing recess;
A support frame disposed in the housing recess of the housing and supporting the liquid crystal display;
With
In the housing recess of the housing,
A support portion in proximity to or in contact with the outer periphery of the support frame;
An offset portion offset outward by a predetermined distance from a contact portion between the support portion and the support frame so as not to contact the outer peripheral portion of the liquid crystal display,
It is formed in this order from the bottom of the receiving recess ,
The support portion is a plurality of convex portions formed to protrude from the bottom surface side region of the inner wall surface of the accommodating concave portion, respectively.
It is characterized by that.

An electronic apparatus according to the second aspect of the present invention is
A liquid crystal display and a support structure for a liquid crystal display according to the first aspect of the present invention are provided.

  According to the present invention, even if the liquid crystal display is enlarged and the wall portion is formed of the same kind of material and the same thickness as the conventional one in order to ensure the strength of the casing in which the liquid crystal display is disposed, It is possible to provide a support structure for a liquid crystal display and an electronic apparatus having the support structure that can effectively protect the liquid crystal display from an impact such as dropping without increasing the size of the body.

1 is a perspective view showing a mobile phone according to a first embodiment of the present invention. It is a disassembled perspective view which shows the housing | casing of the mobile telephone which concerns on 1st Embodiment of this invention. FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2 (the region indicated by A is a partially enlarged view of the housing). The liquid crystal display unit of the mobile phone according to the first embodiment of the present invention (the region indicated by B is a partially enlarged view of the housing) and the housing (the region indicated by C is a partially enlarged view of the housing). It is a disassembled perspective view shown. It is the VV sectional view taken on the line of FIG. FIG. 3 is an operational view corresponding to the region indicated by A in FIG. 3 indicating that the outer peripheral portion of the liquid crystal display does not contact the inner wall surface of the housing recess when the cellular phone according to the first embodiment of the present invention receives an impact such as dropping. It is. It is a perspective view (A field shown by D is a partial enlarged view of a case) which shows a case of a cellular phone concerning a 2nd embodiment of the present invention. It is the VIII-VIII sectional view taken on the line of FIG. FIG. 6 is an enlarged cross-sectional view showing a state where a cushioning material is interposed between the outer peripheral surface of the liquid crystal display and the inner wall surface of the offset portion in the casing of the mobile phone according to the third embodiment of the present invention. It is sectional drawing which shows the protection structure of the conventional liquid crystal display.

  Embodiments of the present invention will be described below. The present invention can be applied to electronic devices having a liquid crystal display as a display unit such as various mobile phones, electronic cameras, PDAs (Personal Digital Assistants), and notebook computers. In other words, the embodiments described below are for illustrative purposes and do not limit the scope of the present invention. Therefore, those skilled in the art can employ embodiments in which each or all of these elements are replaced with equivalent ones, and these embodiments are also included in the scope of the present invention.

(First embodiment)
As shown in FIG. 1, the mobile phone according to the first embodiment of the present invention includes a first housing 10 in which a rectangular plate-like liquid crystal display unit 20 is disposed below a screen 15 that protects a liquid crystal display, and a liquid crystal display. And a second housing 11 in which a control circuit for controlling the display and a driving battery are arranged. The first housing 10 can be folded around the axis Q with respect to the second housing 11. In the following description, the screen 15 is omitted.
As shown in FIG. 2, the first housing 10 has a bottomed rectangular frame-shaped housing 50, and a rectangular plate-like opening that opens upward (Z direction) is provided at the center of the housing 50. An accommodation recess 51 is provided. The liquid crystal display unit 20 is housed in the housing recess 51.

  Further, the liquid crystal display unit 20 has a backlight frame 45 having a rectangular frame shape (see FIG. 3), and six (plural) engaging projections are provided at predetermined positions on the outer periphery of the backlight frame 45. A portion 47 is provided. Six (a plurality of) engagement recesses 57 are provided at predetermined positions corresponding to the respective engagement protrusions 47 on the inner peripheral wall of the housing recess 51 of the housing 50. The liquid crystal display unit 20 is housed and fixed in the housing recess 51 of the housing 50 in a state where the engaging protrusion 47 is engaged with the engaging recess 57.

  As shown in FIG. 3, the liquid crystal display unit 20 includes a rectangular flat liquid crystal display 30, a backlight unit 40 that irradiates the liquid crystal display 30 with light from the back surface thereof, and surrounds the backlight unit 40 and the liquid crystal display 30. And a backlight frame 45 that supports the frame at the peripheral edge thereof.

  The liquid crystal display 30 has a pair of upper and lower glass substrates (not shown) each having a rectangular flat plate shape, and a liquid crystal layer sandwiched between the pair of glass substrates, and is applied from the control circuit. Characters, numbers, symbols, images, etc. are displayed according to the driving voltage.

  The backlight unit 40 includes an optical sheet 41, a light guide plate 42, a reflection plate 43, and an LED (Light Emitting Diode) (not shown). The light guide plate 42 takes in the emitted light from the LED, which is a light source, from the light incident end surface into the inside, and makes the taken light into a planar light emission while repeating reflection and transmission at the light emitting portion, and emits it to the liquid crystal display 30 side. . The optical sheet 41 condenses the light emitted from the light guide plate 42 toward the liquid crystal display 30 side. The reflection plate 43 is a rectangular light reflection member, and is disposed at the bottom of the housing recess 51 of the housing 50. The reflection plate 43 reflects light leaking from the light guide plate 42 toward the reflection plate 43 and returns it to the light guide plate 42 side. It has a function.

  As shown in FIG. 3, the frame-like portions constituting the four sides of the backlight frame 45 have a rectangular cross section. As shown in the area indicated by A in FIG. 3, each side of the frame-shaped portion has a front surface 45a, an inner side surface 45b, a back surface 45c, and an outer side surface 45d. The backlight frame 45 is formed of a resin having both rigidity and elasticity, such as polycarbonate resin and acrylic resin.

  As shown in FIG. 3, the backlight frame 45 surrounds the backlight unit 40 with its inner wall surface 45b, thereby protecting the light guide plate 42 and the like of the backlight unit 40 from an impact such as dropping. The back surface 45 c of the backlight frame 45 is fixed to the reflecting plate 43. In this state, referring to FIG. 3, the total height of the backlight frame 45 and the reflector 43 is h (mm).

  Further, the upper surface 45a of the backlight frame 45 is flat, and the backlight frame 45 is joined to the peripheral portion of the liquid crystal display 30 via an adhesive tape (not shown) attached to a predetermined region of the upper surface 45a. The As a result, the liquid crystal display 30 is attached to the backlight frame 45.

  As shown in FIG. 3, the width dimension in the left-right direction (X direction) of the liquid crystal display 30 is set to be slightly smaller than the outer dimension in the left-right direction of the backlight frame 45. The liquid crystal display 30 is fixed to the backlight frame 45. Specifically, the liquid crystal display 30 is fixed to the backlight frame 45 with the adhesive tape at a position where the outer surface 45d of the backlight frame 45 is shifted outward by C3 (mm) from the left and right outer peripheral surfaces 30a. Has been. Note that the outer peripheral surface 30a of the liquid crystal display 30 may be flush with the outer surface 45d of the backlight frame 45, or may be slightly outward from the outer surface 45d.

  As shown in FIG. 4, the left and right outer surfaces 45d of the backlight frame 45 are provided with a plurality of left and right engaging projections 47 (see FIG. 2). A plurality of engaging recesses 57 corresponding to the engaging protrusions 47 are provided on the inner peripheral wall of the housing recess 51 of the housing 50. As shown in FIG. 5, each engaging projection 47 is formed with a tapered surface 48 so as to become narrower downward. When the backlight frame 45 is housed in the housing recess 51, the tapered surface 48 of the engaging projection 47 abuts against the inner wall surface 53 (53 a) of the housing recess 51, so that the backlight frame 45 made of polycarbonate resin is formed. By bending, the backlight frame 45 is stably accommodated in the accommodating recess 51.

  Returning to FIG. 2, the housing 50 has a bottomed rectangular frame shape and is provided with an accommodation recess 51. The housing recess 51 is a recess having a rectangular opening, and includes a bottom surface 52 and four side surfaces 53, 54, 55, and 56.

  3, the side surface 53 in the longitudinal direction is offset to the outside of the housing 50 from the support surface 53b, the stepped portion 53c, and the support surface 53b. And an offset portion 53a provided. The support surface 53 b functions as a support portion that supports the liquid crystal display unit 20 by approaching or in contact with the outer peripheral portion of the backlight frame 45 accommodated in the accommodation recess 51. The offset portion 53 a is offset from the support surface 53 b to the outside of the housing 50 in order to prevent the liquid crystal display 30 from coming into direct contact with the housing 50.

  Similarly, the side surface 55 facing the side surface 53 is also formed of a support surface, a stepped portion, and an offset portion, and is engaged at a position corresponding to the engaging convex portion 47 provided on the liquid crystal display unit 20. A recess 57 is provided.

  And as shown in FIG. 3, the height of the support surface 53b (step part 53c) from the bottom face 52 is set to H1 (mm).

  Next, a state where the liquid crystal display unit 20 is housed in the housing 50 will be described in detail.

  As shown in FIG. 3, when the liquid crystal display unit 20 is housed in the housing 50, the outer surface 45 d of the backlight frame 45 comes close to the support portion 53 b provided in the housing 50, so that the housing 50 Supported by. When the liquid crystal display unit 20 is housed in the housing 50, the outer surface 45 d of the backlight frame 45 is supported by the housing 50 by making direct contact with the support portion 53 b provided in the housing 50. May be.

  Specifically, when the liquid crystal display unit 20 is housed in the housing 50, a clearance C1 (mm) is formed between the outer surface 45d of the backlight frame 45 and the support surface 53b of the housing recess 51. On the other hand, the outer peripheral surface 30a of the liquid crystal display 30 is positioned inward by a distance C3 (mm) from the outer surface 45d of the backlight frame 45, and the casing 50 is offset outward from the support surface 53b. Since the offset portion 53a is provided, a clearance C2 (mm) is formed between the outer peripheral surface 30a of the liquid crystal display 30 and the offset portion 53a of the housing recess 51. Since the offset portion 53a is offset from the support surface 53b to the outside of the housing 50, the clearance C2 is larger than C1. Therefore, as shown in FIG. 6, even when the mobile phone receives an impact, the liquid crystal display unit 20 can move only a distance C1 (mm) at the maximum, and the outer peripheral surface 30a of the liquid crystal display 30 can be There is no contact with the offset portion 53a.

  Further, as shown in FIG. 3, the height H1 (mm) of the support surface 53b (stepped portion 53c) from the bottom surface 52 of the accommodating recess 51 is the total h (mm) of the backlight frame 45 and the reflector 43. Therefore, the upper surface 45a of the backlight frame 45 is disposed above the stepped portion 53c (on the opening side of the housing recess). Therefore, when the liquid crystal display 30 is fixed to the backlight frame 45 in a state where the outer peripheral surface 30a of the liquid crystal display 30 slightly protrudes from the outer surface 45d of the backlight frame 45 due to an attachment error or the like, the mobile phone is shocked. Even when it is received, since the distance C2 is secured between the outer peripheral surface 30a of the liquid crystal display 30 and the offset portion 53a of the receiving recess 51, there is a possibility that the outer peripheral surface 30a contacts the offset portion 53a of the receiving recess 51. To reduce.

  As described above, according to the mobile phone of the present embodiment, the offset portion 53 a that is offset outward from the support surface 53 b for supporting the liquid crystal display unit 20 is formed in the housing recess 51 of the housing 50. In addition, the frame-shaped portion constituting the four sides of the backlight frame 45 has a rectangular cross section, and the upper surface 45a of the backlight frame 45 is disposed above the stepped portion 53c. Even when the liquid crystal display unit 20 is displaced in the housing recess, the outer peripheral surface 30a of the liquid crystal display 30 does not collide with the inner wall surface of the housing recess 51, and the liquid crystal display 30 is prevented from being damaged.

Conventionally, the end portion of the liquid crystal display is surrounded by the outer peripheral rib of the backlight frame having an L-shaped cross section. However, in this embodiment, there is no outer peripheral rib, and therefore, only the width of the outer peripheral rib. The liquid crystal display can be enlarged. Furthermore, the outer peripheral surface 30a of the liquid crystal display 30 is prevented from colliding with the inner wall surface of the housing recess 51 only by making the offset width of the offset portion 53a sufficiently smaller than the thickness of the wall portion of the housing 50. So you can
The casing 50 can ensure the same strength as the conventional one.

  Further, by eliminating the outer peripheral ribs of the backlight frame, the space corresponding to the thickness of the outer peripheral ribs can be divided into an increase in the size of the liquid crystal display and an increase in the thickness of the housing. Specifically, the thickness of the housing wall portion of the offset portion 53a is made equal to the thickness of the conventional housing wall portion, and the support surface 53b is formed below the offset portion 53a and inside the housing 50. Thereby, the thickness of the housing | casing wall part of the support surface 53b becomes thicker than the thickness of the conventional housing | casing wall part. Further, the liquid crystal display unit 20 is enlarged to a position where the backlight frame 45 is close to the support surface 53b. Thereby, the liquid crystal display can be made larger than the conventional one, and the strength of the housing can be increased.

(Second Embodiment)
This embodiment demonstrates the case where a convex part is provided in the side surface in an accommodation recessed part. Hereinafter, the configuration common to the display-side casing 10 of the mobile phone according to the first embodiment is omitted by the same or corresponding reference numerals unless otherwise described.

  As shown in FIG. 7, the housing 60 has a bottomed rectangular frame shape and is provided with an accommodation recess 61. The housing recess 61 is a recess having a rectangular opening, and includes a bottom surface 62 and four side surfaces 63, 64, 65, 66.

  Then, as shown in the region indicated by D in FIG. 7, unlike the first embodiment, the side surface 63 in the longitudinal direction is a flat surface having no offset portion and stepped portion, and the side surface 63 includes a bottom surface. A plurality of support protrusions 69 connected to 62 are formed. The support convex part 69 is a rectangular parallelepiped shape, and has a support surface 69b and a step part 69c. The support surface 69 b functions as a support portion that supports the liquid crystal display unit 20 by being close to or in contact with the outer peripheral portion of the backlight frame 45 housed in the housing recess 61. Further, the side surface 63 is offset from the support surface 69 b to the outside of the housing 60 in order to prevent the liquid crystal display 30 from coming into direct contact with the housing 60.

  Similarly, a plurality of support protrusions 69 are formed on the side surface 65 facing the side surface 63.

  And as shown in FIG. 8, the height of the support surface 69b (step part 69c) from the bottom face 62 is set to H2 (mm).

  Next, a state where the liquid crystal display unit 20 is housed in the housing 60 will be described in detail.

  As shown in FIG. 8, when the liquid crystal display unit 20 is housed in the housing 60, the outer surface 45 d of the backlight frame 45 comes close to the support surface 69 b provided in the housing 60, so that the housing 60 Supported by. When the liquid crystal display unit 20 is housed in the housing 60, the outer surface 45 d of the backlight frame 45 is supported by the housing 60 by directly contacting the support surface 69 b provided on the housing 60. May be.

  Specifically, when the liquid crystal display unit 20 is housed in the housing 60, a clearance C4 (mm) is formed between the outer surface 45d of the backlight frame 45 and the support surface 69b of the housing recess 61. On the other hand, the outer peripheral surface 30a of the liquid crystal display 30 is located inward by a distance C3 (mm) from the outer surface 45d of the backlight frame 45, and the side surface 63 of the housing 60 is further outward than the support surface 69b. Since the offset is provided, a clearance C5 (mm) is formed between the outer peripheral surface 30a of the liquid crystal display 30 and the side surface 63 of the housing recess 61. Since the side surface 63 is offset from the support surface 69b to the outside of the housing 60, the clearance C5 is larger than C4. Therefore, even when the mobile phone receives an impact, the liquid crystal display unit 20 can move only a distance C4 (mm) at the maximum, and the outer peripheral surface 30a of the liquid crystal display 30 does not contact the side surface 63 of the housing recess 61. Absent.

  Further, as shown in FIG. 8, the height H2 (mm) of the support surface 69b (stepped portion 69c) from the bottom surface 62 of the housing recess 61 is the total h (mm) of the height of the backlight frame 45 and the reflector 43. Therefore, the upper surface 45a of the backlight frame 45 is disposed above the stepped portion 69c (on the opening side of the housing recess). Therefore, when the liquid crystal display 30 is fixed to the backlight frame 45 in a state where the outer peripheral surface 30a of the liquid crystal display 30 slightly protrudes from the outer surface 45d of the backlight frame 45 due to an attachment error or the like, the mobile phone is shocked. Even when it is received, since the distance C5 is ensured between the outer peripheral surface 30a of the liquid crystal display 30 and the side surface 63 of the accommodating recess 61, the outer peripheral surface 30a does not collide with the side surface 63 of the accommodating recess 61.

  As described above, according to the mobile phone of this embodiment, the side surface 63 that is offset outward from the support surface 69 b for supporting the liquid crystal display unit 20 is formed in the housing recess 61 of the housing 60. Further, since the upper surface 45a of the backlight frame 45 is disposed above the stepped portion 69c, the outer peripheral surface of the liquid crystal display 30 can be obtained even when the liquid crystal display unit 20 is displaced in the housing recess due to dropping of the mobile phone. 30a does not collide with the inner wall surface of the accommodating recess 61, and the liquid crystal display 30 is prevented from being damaged.

(Third embodiment)
This embodiment demonstrates the case where a buffer material is provided in the offset part of the accommodation recessed part. Hereinafter, the configuration common to the display-side casing 10 of the mobile phone according to the first embodiment is omitted by the same or corresponding reference numerals unless otherwise described.

  As shown in FIG. 9, a buffer material 70 is provided in the offset portion 53 a of the housing 50. The cushioning material 70 is made of silicon rubber, and the thickness thereof is smaller than the clearance C6 between the outer peripheral surface 30a of the liquid crystal display 30 and the offset portion 53a of the housing 50.

  The buffer material 70 is provided so as to face the entire outer peripheral surface 30 a of the liquid crystal display 30. The buffer material 70 may be provided so as to face a part of the outer peripheral surface 30 a of the liquid crystal display 30.

  According to the present embodiment, since the buffer member is provided in the offset portion 53a of the housing 50, there is no possibility that the outer peripheral surface 30a of the liquid crystal display 30 collides with the inner wall surface, and damage to the liquid crystal display 30 is prevented. .

  In addition, this invention is not limited to said embodiment, A various deformation | transformation is possible.

  In the above embodiment, the convex portion is a rectangular parallelepiped shape, but is not limited thereto, and may be a hemispherical shape or a flat plate shape.

  Further, in the above embodiment, the outer dimension in the left-right direction (X direction) of the backlight frame 45 is formed larger than the outer dimension of the liquid crystal display, but the present invention is not limited to this, and these dimensions are May be substantially the same.

  In the above embodiment, the cushioning material 70 is made of silicon rubber, but is not limited to this. Other materials may be used as long as they have a buffering property. For example, foam materials such as sponges and polyethylene foam sheets, impact absorbing gels, springs, and the like may be used.

  In the above embodiment, when the liquid crystal display unit 20 is housed in the housing 50, the outer surface 45 d of the backlight frame 45 approaches or comes into contact with the support portion 53 b provided in the housing 50. Although supported by the housing 50, the outer surface 45d may be supported by the housing 50 by contacting the support surface 53b.

DESCRIPTION OF SYMBOLS 10 Display side housing | casing 20 Liquid crystal display unit 30 Liquid crystal display 40 Backlight part 41 Optical sheet 42 Light guide plate 43 Reflecting plate 45 Backlight frame (support frame)
50 Housing 51 Housing recess 52 Bottom surface 53, 54, 55, 56 Side surface 53a Offset portion 53b Support surface 53c Step portion 69 Projection portion 69b Support surface 69c Step portion 70 Buffer material

Claims (5)

A housing having a housing recess and housing a liquid crystal display in the housing recess;
A support frame disposed in the housing recess of the housing and supporting the liquid crystal display;
With
In the housing recess of the housing,
A support portion in proximity to or in contact with the outer periphery of the support frame;
An offset portion offset outward by a predetermined distance from a contact portion between the support portion and the support frame so as not to contact the outer peripheral portion of the liquid crystal display,
It is formed in this order from the bottom of the receiving recess,
The support portion, the support structure of the liquid crystal display you characterized in that the bottom side of the region of the inner wall of the housing recess is a plurality of protrusions formed to protrude respectively. The liquid crystal display is supported on the upper surface of the support frame,
The support portion and the offset portion are formed in a step shape,
2. The support structure for a liquid crystal display according to claim 1, wherein a height of the surface of the support frame from a bottom surface of the housing recess is higher than a height of the support portion from the bottom surface.   3. The liquid crystal display according to claim 1, wherein the liquid crystal display is supported by the housing via the support frame by the support portion coming into contact with an outer peripheral portion of the support frame. Support structure. The support structure for a liquid crystal display according to any one of claims 1 to 3 , wherein a buffer material is interposed between the outer peripheral surface of the liquid crystal display and the inner wall surface of the offset portion. . An electronic apparatus with a liquid crystal display, comprising the, a support structure of the liquid crystal display according to any one of claims 1 to 4.

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