JP4356370B2 - Liquid crystal display device and electronic device - Google Patents

Description

【００６８】
［電子機器］
以上の各実施の形態の液晶表示装置はヒンジを介して本体に取り付けられ、本発明の実施の形態に係る電子機器を構成する。図１３に、その電子機器５０の一例としてビデオカメラを示す。
【００６９】
電子機器５０は、上述した構成を有する液晶表示装置１がヒンジｈを介して本体５１に対して回動自在に取り付けられて構成される。本体５１には、図示しないレンズやバッテリーなどが具備される。
【００７０】
なお、電子機器としてはビデオカメラに限らず、ＰＤＡ（Personal Digital Assistants）、携帯電話機、デジタルスチルカメラなどであってもよい。
【００７１】
以上、本発明の各実施の形態について説明したが、勿論、本発明はこれらに限定されることなく、本発明の技術的思想に基づいて種々の変形が可能である。
【００７２】
突起部１７の形状は円柱状に限らず、角柱状や円錐台形状であってもよい。また、表示窓４に透明なシートを張ってもよい。また、第２の実施の形態において、エンボス部の個数や形成箇所は図１１、１２に示す形態に限らず、例えば、エンボス部４０ａと４０ｄとの間や、エンボス部４０ｃと４０ｆとの間にもエンボス部を形成してもよい。
【００７３】
【発明の効果】
以上述べたように、本発明によれば、液晶パネルユニットの背面に被せられる金属プレートと、この金属プレートに対向する裏蓋筐体のどちらか一方から突出して、他方に先端部が当接する突起部を設けることで、金属プレート及びこの金属プレートに背面が支えられた液晶パネルユニットの撓みを抑えることができ、液晶パネルユニットの割れを防げる。
【００７４】
しかも、金属プレートと裏蓋筐体との間という元々存在する間隙に、単に突起部を配設するという簡単な構成であるので、平面寸法の増大や部品内蔵スペースの増大を招くことなく液晶表示装置、あるいはこれを備えた電子機器の小型の妨げにはならない。
【図面の簡単な説明】
【図１】本発明の実施の形態に係る窓枠筐体の平面図である。
【図２】図１に示す窓枠筐体に収容される液晶パネルユニットの正面図である。
【図３】同液晶パネルユニットの背面図である。
【図４】図３に示す液晶パネルユニットの背面に被せられる金属プレートの斜視図である。
【図５】図４の金属プレート上に配置される回路基板の平面図である。
【図６】窓枠筐体に組み付けられる裏蓋筐体の斜視図である。
【図７】窓枠筐体に液晶パネルユニットを収容した状態の平面図である。
【図８】図７に示す液晶パネルユニットに金属プレートが被せられた状態の平面図である。
【図９】図８に示す金属プレート上に回路基板が配置された状態の平面図である。
【図１０】本発明の実施の形態に係る液晶表示装置の斜視図である。
【図１１】第２の実施の形態に係る金属プレートの斜視図である。
【図１２】図１１の金属プレートが液晶パネルユニットに被せられた状態の平面図である。
【図１３】本発明の実施の形態に係る電子機器の斜視図である。
【図１４】本発明の実施の形態に係る液晶表示装置の要部断面図である。
【図１５】表示面への静荷重試験において静荷重を与えたポイントを示す液晶表示装置の平面図である。
【図１６】プッシュプルゲージを用いた静荷重試験方法を示す模式図である。
【符号の説明】
１…液晶表示装置、２…表示面、３…窓枠筐体、４…表示窓、５…裏蓋筐体、１１…液晶パネルユニット、１３…液晶パネルユニットの背面、１６…金属プレート、１７…突起部、２２…回路基板、２３…実装部品、３１…裏蓋筐体の内面、４０ａ〜４０ｇ…エンボス部、４６…金属プレート、５０…電子機器、５１…本体。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a liquid crystal display device in which a liquid crystal panel unit is housed in a housing and an electronic apparatus including the same, and more specifically, prevents the liquid crystal panel unit from being broken by a metal plate that supports the back surface of the liquid crystal panel unit in the housing. The present invention relates to a liquid crystal display device and an electronic apparatus.
[0002]
[Prior art]
Conventionally, particularly in a small-sized liquid crystal display device, a metal plate is put on the back surface of the liquid crystal panel unit housed in the housing, and the four corners of the metal plate, for example, near the back surface of the liquid crystal panel unit are screwed to the housing. As a result, a structure for holding the liquid crystal panel unit in the casing is adopted.
[0003]
However, the metal plate is not constrained in the casing except for the screwed part, and if a static load is applied to the liquid crystal panel unit by pressing the display surface of the liquid crystal panel unit from the outside, the liquid crystal is displayed together with the metal plate. There is a problem that the panel unit is easily bent. When this amount of deflection is large, the glass substrate of the liquid crystal panel unit is broken.
[0004]
According to Patent Document 1, a plate spring is provided on a support plate that supports a liquid crystal panel unit in surface contact, and the side surface of the liquid crystal panel unit is pressed against a positioning member provided on the support plate with the plate spring. A configuration is disclosed in which the impact force applied to the support plate is not directly applied to the liquid crystal panel unit.
[0005]
[Patent Document 1]
JP-A-5-334864
[0006]
[Problems to be solved by the invention]
However, in the configuration of Patent Document 1, it is necessary to dispose the leaf spring so as to face the side surface of the liquid crystal panel unit, resulting in an increase in planar dimensions and an increase in the number of parts, which hinders downsizing of the liquid crystal display device. become.
[0007]
The present invention has been made in view of the above problems, and an object of the present invention is to provide a liquid crystal display device and an electronic apparatus that can prevent cracking of the liquid crystal display panel unit with a simple configuration without hindering downsizing. .
[0008]
[Means for Solving the Problems]
In solving the above problems, a liquid crystal display device of the present invention includes a window frame housing in which a display window is formed, and a liquid crystal panel unit that is accommodated in the window frame housing with a display surface exposed from the display window. The metal plate that covers the back surface of the liquid crystal panel unit and is removed from the back surface is fixed to the window frame housing, and is assembled to the window frame housing to close the space in which the liquid crystal panel unit and the metal plate are accommodated. It is characterized by comprising a back cover housing, a metal plate, and a protrusion that protrudes from one of the back cover housings facing the metal plate and the tip of which contacts the other.
[0009]
In order to solve the above problems, an electronic device according to the present invention includes a window frame housing in which a display window is formed, and a liquid crystal panel unit that is accommodated in the window frame housing with the display surface exposed from the display window. And a metal plate that covers the back surface of the liquid crystal panel unit and is removed from the back surface and is fixed to the window frame housing, and is assembled to the window frame housing to close the space in which the liquid crystal panel unit and the metal plate are accommodated. A liquid crystal display device including a back cover housing, a metal plate, and a protrusion projecting from one of the back cover housing facing the metal plate and the other end contacting the other end. It is characterized in that it can be rotated freely.
[0010]
The liquid crystal panel unit is held so as to be sandwiched between the window frame casing and the metal plate. The metal plate is not in surface contact with the back cover housing, and a gap is formed between the metal plate and the back cover housing so that a circuit board or the like having a mounting component can be placed. The metal plate and the back cover housing interfere with each other through the projected portion.
[0011]
Even when a static load is applied to the display surface of the liquid crystal panel unit, the protrusion functions like a stick and suppresses the bending of the metal plate toward the back cover housing. As a result, even in the liquid crystal panel unit in which the back surface is supported by the metal plate in which the bending is suppressed, the bending is suppressed, and the cracking of the liquid crystal panel unit can be prevented.
[0012]
As the protrusion, if the protrusion itself bends, the metal plate will be allowed to be bent, so that it does not flex or shrink even if it is sandwiched between the metal plate and the back cover housing. Use the material you have. For example, a metal material, a hardened plastic, a carbon-type material, etc. are mentioned.
[0013]
Also, the back cover housing is preferably made of a material that has a hardness that prevents the protrusions from entering due to the contact of the protrusions and that is not easily broken by the contact of the protrusions. For example, a metal such as magnesium or a magnesium-based alloy Materials can be mentioned.
[0014]
The protrusion may protrude from the metal plate or the inner surface of the back cover housing. However, when other components such as a circuit board are mounted on the metal plate, the inner surface of the back cover housing. If the protrusion is formed on the inner surface of the window frame housing, the inner surface cannot be seen. There is a risk that the circuit board will be cracked due to contact with the circuit board itself.
[0015]
On the other hand, if the protrusion is provided on the metal plate, the through hole formed on the circuit board is aligned with the protrusion while clearly confirming the protrusion visually. The substrate can be placed on a metal plate, and can be easily put on and attached to the back cover housing without paying special attention. There is no damage to the circuit board or mounting parts.
[0016]
Moreover, if the convex part which protrudes in the surface side covered with a liquid crystal panel unit is formed in a metal plate, the mechanical strength of metal plate itself can be improved and it can be made hard to bend. Further, if the plurality of convex portions are formed so as to be evenly arranged in the surface direction, the back surface of the liquid crystal panel unit can be received without unevenness at the protruding portion of each convex portion, and the local bias is applied to the liquid crystal panel unit. It is possible to prevent the bending due to the action.
[0017]
Further, considering the case where other components such as a circuit board are arranged on the metal plate, it is better that the number of protrusions is small. This is because a through-hole or the like for avoiding the protruding portion must be formed in the circuit board, and the arrangement of the mounting parts is limited, or high-density mounting is hindered. For example, in a small liquid crystal panel unit used for a video camera, a digital still camera, a cellular phone, etc., one protrusion is sufficient. Also, if only one protrusion is provided in the center of the metal plate, and the protrusion is formed in a symmetrical arrangement relationship with the protrusion interposed therebetween, a synergistic effect between the protrusion and the protrusion is obtained. A further bending suppression effect can be obtained.
[0018]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an exemplary embodiment of the present invention will be described with reference to the drawings.
[0019]
[First Embodiment]
FIG. 10 shows a liquid crystal display device 1 according to the present embodiment. A liquid crystal panel unit, a metal plate, and a circuit board, which will be described below, are accommodated in a space in which a pair of casings including a window frame casing 3 and a back cover casing 5 are combined.
[0020]
(Window frame housing)
The top view which looked at the window frame housing | casing 3 from the inner surface side in FIG. 1 is shown. The window frame housing 3 is formed with a display window 4 as a through-hole that has the same rectangular shape as the display surface of the liquid crystal panel unit to be accommodated and has the same planar dimensions as the display surface. A side wall 7 is erected on the edge of the inner surface of the window frame housing 3, and an accommodation space for a liquid crystal panel unit, a metal plate, and a circuit board, which will be described later, is partitioned inside the side wall 7.
[0021]
Cylindrical boss portions 8a, 8b, 8c and 8d are formed at the four corners of the region surrounded by the side wall 7. Furthermore, four cylindrical boss portions 8e, 8f, 8g, and 8h are also formed between the boss portion 8a and the boss portion 8c. Among these boss parts 8a to 8h, screw holes are formed in the boss part 8b, the boss part 8d, the boss part 8e, the boss part 8f, the boss part 8g, and the boss part 8h. Through holes are formed in the remaining two boss portions 8a and 8c.
[0022]
Two claw portions 9 protruding inward are formed on the side wall 7 between the boss portion 8b and the boss portion 8d. Further, a step portion 10 is formed at the boundary between the region where the boss portions 8a to 8h are arranged and the region around the display window 4, and the rectangular ring-shaped region around the display window 4 is the arrangement of the boss portions 8a to 8h. 1 step down from the region near the left and right edges. A liquid crystal panel unit, which will be described later, is accommodated in this lowered area.
[0023]
The window frame housing 3 configured as described above is made of, for example, a magnesium material having both lightness and strength. Further, the magnesium material is excellent in thin-wall moldability as compared with the resin material.
[0024]
(LCD panel unit)
FIG. 2 shows a front view of the liquid crystal panel unit 11 and FIG. 3 shows a rear view. The liquid crystal panel unit 11 includes a liquid crystal panel, a light guide plate disposed on the back surface (opposite surface of the display surface 2) of the liquid crystal panel, and an optical element such as a prism sheet and a diffusion sheet disposed between the liquid crystal panel and the light guide plate. A sheet, a reflective sheet disposed on the back surface of the light guide plate, and a light source disposed to face the light incident end surface of the light guide plate, and these are accommodated in a flat box-shaped case 14 made of resin, for example. In addition, a metal frame member 12 covering the periphery of the display surface 2 is assembled to the case 14 to constitute an integral unit.
[0025]
The liquid crystal panel includes two glass substrates on which transparent electrodes are deposited and liquid crystal molecules are sealed and bonded together, a color filter, a polarizing filter, and the like.
[0026]
One end surface of the light guide plate is a light incident end surface that receives light from the light source, and the light source is disposed to face the light incident end surface. For example, a light emitting diode is incorporated as a light source at the right end as viewed in FIG.
[0027]
Further, as shown in FIG. 3, a claw portion 15 is formed at the edge of the long side of the back surface 13 (the back surface of the case 14) of the liquid crystal panel unit 11. The claw portion 15 is formed so as to protrude from the back surface 13.
[0028]
(Metal plate)
FIG. 4 shows a perspective view of the metal plate 16. The metal plate 16 is made of, for example, a stainless material, and most of the metal plate 16 has a substantially rectangular shape and is occupied by a plate portion 18 having substantially the same planar dimensions as the liquid crystal panel unit 11. Four projecting portions 19 a to 19 d are integrally formed on the short side edge of the plate portion 18, and through holes 20 a to 20 d are formed respectively.
[0029]
Further, a rectangular notch 21 is formed at a location near the overhanging portions 19c and 19d on the long side edge of the plate portion 18. Further, a bent portion 36 is formed on the side of the protruding portion 19c. The bent portion 36 extends from the plate portion 18 and bends at a substantially right angle to a frame-like portion having a rectangular through hole 36a.
[0030]
(protrusion)
A projecting portion 17 made of a stainless material is also provided in the center of the metal plate 16. The protrusion 17 has, for example, a cylindrical shape, and one end thereof is caulked and fixed to the metal plate 16. The protruding direction of the protruding portion 17 is the same as the bending direction of the bent portion 36, and there is no protruding member on the back surface of the metal plate 16, which is a surface that covers the back surface 13 of the liquid crystal panel unit 11, and is a flat surface.
[0031]
(Circuit board)
FIG. 5 shows a plan view of the circuit board 22. A through hole 24 is formed near the center of the circuit board 22, and various mounting components (including connectors) 23 are mounted so as to avoid the through hole 24. The circuit board 22 is configured, for example, by mounting a mounting component 23 on one side on a printed wiring board in which a copper material pattern is formed on one surface of an epoxy insulating board.
[0032]
A rectangular claw portion 25 is formed on the short side edge on the right side when viewed from the circuit board 22. The claw portion 25 is formed so as to protrude from the edge in parallel to the surface direction of the circuit board 22. Two overhanging portions 27a and 27b are formed on the short side edge on the side opposite to the short side edge where the claw portion 25 is formed, and through holes 28a and 28b are formed respectively. Further, a substantially rectangular notch 26 is formed at a position near the claw portion 25 on the long side edge of the circuit board 22.
[0033]
(Back cover housing)
FIG. 6 shows a perspective view of the back cover housing 5 as seen from the inner surface side. The back cover housing 5 has a flat box shape in which side walls 29 are formed at three edges of the rectangular cover plate portion 37. Engagement hole forming portions 32a and 32b are formed at the edge portion where the side wall 29 is not formed. In the engagement hole forming portions 32a and 32b, engagement holes 33a and 33b are formed in which the claw portions 9 (see FIG. 1) of the window frame housing 3 described above can be engaged. Boss portions 30a and 30b are formed at both end portions on the edge side facing the edge portion where the engagement hole forming portions 32a and 32b are formed. Screw holes are formed in the boss portions 30a and 30b. This back cover housing 5 is also made of a magnesium material, like the window frame housing 3.
[0034]
(Assembly of liquid crystal display device)
First, the liquid crystal panel unit 11 is accommodated in the window frame housing 3. The liquid crystal panel unit 11 is accommodated with the display surface 2 exposed from the display window 4 in a region recessed by one step from the region where the boss portions 8 a to 8 h are disposed by the step portion 10. This accommodated state is shown in FIG. The movement of the long side surface of the liquid crystal panel unit 11 in the Y direction shown in the figure is restricted by the side wall 7 of the window frame housing 3, and the movement of the short side surface is restricted in the X direction by the step portion 10.
[0035]
Next, the metal plate 16 is put on the back surface 13 of the liquid crystal panel unit 11. This state is shown in FIG. The rear surface 13 of the liquid crystal panel unit 11 is covered with the surface of the protruding portion 17 and the bent portion 36 that does not protrude. At this time, the metal plate 16 is positioned with respect to the liquid crystal panel unit 11 by positioning the claw portion 15 formed on the back surface 13 of the liquid crystal panel unit 11 in the notch 21 formed in the metal plate 16.
[0036]
Thereby, the through hole 20a formed in the overhanging portion 19a of the metal plate 16 is positioned on the screw hole of the boss portion 8e (see FIGS. 1 and 7), and the through hole 20b formed in the overhanging portion 19b is the boss. The through hole 20c formed in the overhanging portion 19c is located on the screw hole of the boss portion 8b (see FIGS. 1 and 7), and is located on the screw hole of the portion 8h (see FIGS. 1 and 7). The through hole 20d formed in 19d is positioned on the screw hole of the boss portion 8d (see FIGS. 1 and 7).
[0037]
And by screwing each screw hole of each boss part 8e, 8h, 8b, 8d through each through-hole 20a-20d, the metal plate 16 is boss part 8e from the back surface 13 of the liquid crystal panel unit 11, It is fixed with respect to the window frame housing 3 at four positions that are dislocated to the 8h, 8b, and 8d sides. The back surface of the plate portion 18 of the metal plate 16 is in contact with the back surface 13 of the liquid crystal panel unit 11. Note that the number of places where the metal plate 16 is fixed to the window frame housing 3 is not limited to four, but may be more or two diagonal positions. The fixing form is not limited to screwing, but may be welding or caulking.
[0038]
Next, the circuit board 22 is placed on the metal plate 16. This state is shown in FIG. The claw portion 25 formed on the circuit board 22 is inserted into the through hole 36 a formed in the bent portion 36 of the metal plate 16, and the claw formed on the back surface 13 of the liquid crystal panel unit 11 in the notch 26 of the circuit board 22. The circuit board 22 is positioned on the metal plate 16 by positioning the portion 15.
[0039]
At this time, the projecting portion 17 projecting on the metal plate 16 protrudes from the through hole 24 formed substantially at the center of the circuit board 22 to the component mounting surface side, and the circuit board 22 is placed on the metal plate 16. Does not interfere with placement. In the circuit board 22, the back surface of the component mounting surface is flat with no wiring patterns or components, and is in contact with the metal plate 16.
[0040]
Further, the through holes 28a and 28b formed in the overhanging portions 27a and 27b of the circuit board 22 are respectively fitted to the screw holes of the boss portions 8f and 8g (see FIG. 1) of the window hole housing 3, and the through holes 28a and 28b. The circuit board 22 is fixed to the window hole housing 3 by tightening screws into the screw holes.
[0041]
The circuit board 22 and the liquid crystal panel unit 11 are electrically connected via a flexible wiring board (not shown), and driving control of the liquid crystal panel and light emission control of the light source are performed by the mounting component 23 on the circuit board 22.
[0042]
Finally, the back cover housing 5 shown in FIG. 6 is assembled to the window frame housing 3. The claw portion 9 of the window frame housing 3 is engaged with the engagement holes 33a and 33b formed in the engagement hole forming portions 32a and 32b of the back cover housing 5, and the boss portion 30a of the back cover housing 5 is further engaged. , 30b are aligned with the boss portions 8a and 8c of the window frame housing 3, and the back cover housing is aligned with the through holes of the boss portions 8a and 8c penetrating to the front side of the window frame housing 3. The screws 6 (see FIG. 10) are fastened into the screw holes of the boss portions 30a and 30b of the five, and the housings 3 and 5 are assembled to each other to obtain the liquid crystal display device 1 shown in FIG.
[0043]
As a result, the liquid crystal panel unit 11, the metal plate 16 provided with the projecting portions 17 and the circuit board 22 are accommodated, and the space surrounded by the side wall 7 of the window frame housing 3 is defined by the back cover housing 5. Blocked. The display surface 2 of the liquid crystal panel unit 11 is exposed from the display window 4 of the window frame housing 3 and is visible.
[0044]
(Operation of protrusion)
Next, the operation of the protrusion 17 will be described with reference to FIG. 14 which is a cross-sectional view of the main part of the liquid crystal display device 1.
[0045]
The protrusion 17 protruding from the metal plate 16 passes through the through hole 24 of the circuit board 22 and protrudes into the gap s between the circuit board 22 and the inner surface 31 of the back cover housing 5. It contacts the inner surface 31 of the back cover housing 5. The tip end of the protrusion 17 and the inner surface 31 of the back cover housing 5 are in light contact with each other and are not in pressure contact.
[0046]
When a static load is applied to the liquid crystal panel unit 11 from the display surface 2 side, the force is transmitted to the metal plate 16 that supports the back surface 13 of the liquid crystal panel unit 11, but the tip of the protrusion 17 is the inner surface of the back cover housing 5. By abutting 31, the metal plate 16 receives a reaction force in the direction opposite to the load acting direction from the back cover housing 5, and the bending is suppressed. As a result, the bending of the liquid crystal panel unit 11 whose back surface is supported by the metal plate 16 in which the bending is suppressed is also suppressed, and a crack caused by the bending can be prevented.
[0047]
Further, the fact that the bending of the metal plate 16 can be suppressed can also suppress the bending of the circuit board 22 supported in surface contact on the metal plate 16 and can prevent the circuit board 22 from cracking. Further, the presence of the protrusion 17 can stably secure a gap s between the component mounting surface of the circuit board 22 and the inner surface 31 of the back cover housing 5, and the mounting component 23 can be secured to the circuit board 22 and the back surface. Damage due to crushing between the inner surface 31 of the lid housing 5 can be prevented.
[0048]
[Second Embodiment]
Next, a second embodiment of the present invention will be described. The same components as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof is omitted.
[0049]
In the present embodiment, the configuration of the metal plate is different from that of the first embodiment. A metal plate 46 according to the present embodiment is shown in FIG.
[0050]
The metal plate 46 is made of, for example, a stainless material, and most of the metal plate 46 is substantially rectangular and occupies a plate portion 48 having substantially the same planar dimensions as the liquid crystal panel unit 11. Four projecting portions 19a to 19d are integrally formed on the short side edge portion of the plate portion 48, and through holes 20a to 20d are respectively formed.
[0051]
Further, a rectangular notch 21 is formed at a location near the overhanging portions 19c and 19d on the long side edge of the plate portion 48. Further, a bent portion 36 is formed on the side of the protruding portion 19c. The bent portion 36 extends from the plate portion 48 and bends at a substantially right angle to a frame-like portion in which a rectangular through hole 36a is formed.
[0052]
A plurality of embossed portions 40 a to 40 g are formed on the plate portion 48. Each embossed part 40a-40g is a convex part which floats on this surface side on the surface (the surface opposite to the surface shown in FIG. 11) covering the back surface 13 of the liquid crystal panel unit 11, and the surface side shown in FIG. It ’s indented.
[0053]
A protruding portion 17 made of a stainless steel material is protruded from the formation position of the embossed portion 40 g at substantially the center of the metal plate 46 in the same manner as the metal plate 46. The protrusion 17 has, for example, a cylindrical shape, and one end thereof is caulked and fixed to the metal plate 46.
[0054]
A circular embossed portion 40g is located approximately at the center of the metal plate 46, and circular embossed portions 40a, 40c, 40d, and 40f are located at diagonal positions (four corners) sandwiching the embossed portion 40g. . An oval embossed portion 40 b is formed between the embossed portion 40 a and the embossed portion 40 c so that the major axis direction thereof is along the longitudinal direction of the metal plate 46. An oval embossed portion 40e is formed between the embossed portion 40d and the embossed portion 40f with its long axis direction along the long direction of the metal plate 46.
[0055]
Similarly to the first embodiment, the metal plate 46 of the present embodiment is also put on the back surface 13 of the liquid crystal panel unit 11 as shown in FIG. The surfaces of the embossed portions 40 a to 40 g that are raised in a convex shape are covered with the back surface 13 of the liquid crystal panel unit 11. At this time, the metal plate 46 is positioned with respect to the liquid crystal panel unit 11 by positioning the claw portion 15 formed on the back surface 13 of the liquid crystal panel unit 11 in the notch 21 formed in the metal plate 46.
[0056]
Thereby, the through hole 20a formed in the overhanging portion 19a of the metal plate 46 is positioned on the screw hole of the boss portion 8e (see FIG. 1), and the through hole 20b formed in the overhanging portion 19b is formed in the boss portion 8h. A through hole 20c formed on the overhanging portion 19c and positioned on the screw hole (see FIG. 1) is positioned on the screw hole of the boss portion 8b (see FIG. 1) and formed in the overhanging portion 19d. The hole 20d is positioned on the screw hole of the boss 8d (see FIG. 1).
[0057]
And by screwing each screw hole of each boss part 8e, 8h, 8b, 8d through each through-hole 20a-20d, the metal plate 46 is the boss part 8e from the back surface 13 of the liquid crystal panel unit 11, and It is fixed with respect to the window frame housing 3 at four positions that are dislocated to the 8h, 8b, and 8d sides.
[0058]
After that, as in the first embodiment, the circuit board 22 is disposed on the metal plate 46, and the back cover housing 5 is assembled to the window frame housing 3 to obtain a liquid crystal display device.
[0059]
Also in the present embodiment, the protrusion 17 protruding from the metal plate 46 passes through the through hole 24 of the circuit board 22 and the gap s between the circuit board 22 and the inner surface 31 of the back cover housing 5 (see FIG. 14). The tip of the protrusion 17 is in contact with the inner surface 31 of the back cover housing 5.
[0060]
Therefore, when a static load is applied to the liquid crystal panel unit 11 from the display surface 2 side, the force is transmitted to the metal plate 46 that supports the back surface 13 of the liquid crystal panel unit 11, but the tip of the protrusion 17 is the back cover housing 5. By being abutted against the inner surface 31 of the metal plate 46, the metal plate 46 receives a reaction force opposite to the load acting direction from the back cover housing 5, and the bending is suppressed. As a result, the bending of the liquid crystal panel unit 11 whose back surface is supported by the metal plate 46 in which the bending is suppressed is also suppressed, and cracks due to the bending can be prevented.
[0061]
In the present embodiment, the embossed portions 40a to 40g are formed on the metal plate 46, so that the mechanical strength of the metal plate 46 itself is improved and the metal plate 46 is hardly bent. Since the embossed portions 40a to 40g are formed in a symmetrical arrangement relationship with respect to the protruding portion 17 located substantially at the center of the metal plate 46, there is no strength bias in the surface direction of the metal plate 46, and the protruding portion 17 and the embossed portion The metal plate 46 is more difficult to bend due to a synergistic action with the portions 40a to 40g.
[0062]
In addition, the embossed portions 40a to 40g are evenly arranged without any deviation in the surface direction, and the convex portions of the embossed portions 40a to 40g are in contact with the back surface 13 of the liquid crystal panel unit 11, so that the back surface 13 of the liquid crystal panel unit 11 is in the surface direction. Can be supported without bias, and the effect of suppressing the deflection of the liquid crystal panel unit 11 can be enhanced.
[0063]
[Static load test for liquid crystal panel unit]
Next, the results of conducting a static load test on the liquid crystal display device having the configuration of the second embodiment and evaluating the breaking strength will be described.
[0064]
The size of the liquid crystal panel unit 11 was 2 inches. The material of the metal plate 46 was JIS symbol SUS304, and the thickness was 0.5 mm.
[0065]
(Test method)
As shown in FIG. 16, using a push-pull gauge (Model DPX-20TR manufactured by Imada Seisakusho) 34, static loads were applied to the four corners and the five central points A to E of the display surface 2 as shown in FIG. 15. The same test was performed on five liquid crystal display devices (samples Nos. 1 to 5) having the same configuration.
[0066]
(result)
In all the measurement locations A to E of all the samples, cracks did not occur even when the static load 70N defined by the standard was reached. In addition, when a static load of 70 N or more was given to the center E for each sample, as shown in Table 1, a resistance greatly exceeding 70 N was obtained.
[0067]
[Table 1]

[0068]
[Electronics]
The liquid crystal display device of each of the above embodiments is attached to the main body via a hinge, and constitutes an electronic apparatus according to the embodiment of the present invention. FIG. 13 shows a video camera as an example of the electronic device 50.
[0069]
The electronic device 50 is configured such that the liquid crystal display device 1 having the above-described configuration is rotatably attached to the main body 51 via a hinge h. The main body 51 includes a lens and a battery (not shown).
[0070]
The electronic device is not limited to a video camera, and may be a PDA (Personal Digital Assistants), a mobile phone, a digital still camera, or the like.
[0071]
As mentioned above, although each embodiment of this invention was described, of course, this invention is not limited to these, A various deformation | transformation is possible based on the technical idea of this invention.
[0072]
The shape of the protrusion 17 is not limited to a cylindrical shape, and may be a prismatic shape or a truncated cone shape. Further, a transparent sheet may be stretched on the display window 4. Moreover, in 2nd Embodiment, the number of embossed parts and a formation location are not restricted to the form shown to FIG. 11, 12, For example, between embossed part 40a and 40d, or between embossed part 40c and 40f May also form an embossed portion.
[0073]
【The invention's effect】
As described above, according to the present invention, the protrusion that protrudes from one of the metal plate that covers the back surface of the liquid crystal panel unit and the back cover housing that faces the metal plate, and the tip of which contacts the other. By providing the portion, it is possible to suppress the bending of the metal plate and the liquid crystal panel unit whose back is supported by the metal plate, and the liquid crystal panel unit can be prevented from cracking.
[0074]
In addition, since the projections are simply arranged in the gap that originally exists between the metal plate and the back cover housing, the liquid crystal display does not cause an increase in plane dimensions or an increase in the space for incorporating components. It does not interfere with the miniaturization of the device or the electronic device equipped with the device.
[Brief description of the drawings]
FIG. 1 is a plan view of a window frame housing according to an embodiment of the present invention.
FIG. 2 is a front view of a liquid crystal panel unit housed in the window frame casing shown in FIG.
FIG. 3 is a rear view of the liquid crystal panel unit.
4 is a perspective view of a metal plate that covers the back surface of the liquid crystal panel unit shown in FIG. 3. FIG.
FIG. 5 is a plan view of a circuit board disposed on the metal plate of FIG. 4;
FIG. 6 is a perspective view of a back cover housing assembled to the window frame housing.
FIG. 7 is a plan view of a state in which a liquid crystal panel unit is housed in a window frame housing.
8 is a plan view showing a state where a metal plate is put on the liquid crystal panel unit shown in FIG.
9 is a plan view showing a state in which a circuit board is arranged on the metal plate shown in FIG. 8. FIG.
FIG. 10 is a perspective view of a liquid crystal display device according to an embodiment of the present invention.
FIG. 11 is a perspective view of a metal plate according to a second embodiment.
12 is a plan view of a state in which the metal plate of FIG. 11 is put on the liquid crystal panel unit.
FIG. 13 is a perspective view of an electronic apparatus according to an embodiment of the invention.
FIG. 14 is a cross-sectional view of main parts of a liquid crystal display device according to an embodiment of the present invention.
FIG. 15 is a plan view of a liquid crystal display device showing points at which a static load is applied in a static load test on a display surface.
FIG. 16 is a schematic diagram showing a static load test method using a push-pull gauge.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Liquid crystal display device, 2 ... Display surface, 3 ... Window frame housing | casing, 4 ... Display window, 5 ... Back cover housing | casing, 11 ... Liquid crystal panel unit, 13 ... Back of liquid crystal panel unit, 16 ... Metal plate, 17 DESCRIPTION OF SYMBOLS ... Projection part, 22 ... Circuit board, 23 ... Mounting component, 31 ... Inner surface of back cover housing | casing, 40a-40g ... Embossing part, 46 ... Metal plate, 50 ... Electronic device, 51 ... Main body.

Claims (2)

A window frame housing in which a display window is formed;
A liquid crystal panel unit accommodated in the window frame housing by exposing a display surface from the display window;
A back cover housing that is assembled to the window frame housing and closes a space in which the liquid crystal panel unit is stored;
A first surface that is housed in the space between the liquid crystal panel unit and the back cover housing and is in contact with the liquid crystal panel unit by being fixed to the window frame housing so as to sandwich the liquid crystal panel unit. A metal plate having a second surface facing the back casing, and an embossed portion formed on the first surface and in contact with the liquid crystal panel unit, and protruding from the second surface And a columnar protrusion that linearly extends toward the back casing and has a tip that contacts the back casing, and presses the liquid crystal panel unit against the back casing. A metal plate that keeps the gap between the second surface and the back cover housing constant by the protrusion when an external force is applied ;
A liquid crystal display device comprising: a circuit board having a through-hole through which the protrusion penetrates, disposed in the gap, and fixed to the window frame casing . The body,
A liquid crystal display device rotatably attached to the main body,
The liquid crystal display device
A window frame housing in which a display window is formed;
A liquid crystal panel unit accommodated in the window frame housing by exposing a display surface from the display window;
A back cover housing that is assembled to the window frame housing and closes a space in which the liquid crystal panel unit is stored;
A first surface that is housed in the space between the liquid crystal panel unit and the back cover housing and is in contact with the liquid crystal panel unit by being fixed to the window frame housing so as to sandwich the liquid crystal panel unit. A metal plate having a second surface facing the back casing, and an embossed portion formed on the first surface and in contact with the liquid crystal panel unit, and protruding from the second surface And a columnar protrusion that linearly extends toward the back casing and has a tip that contacts the back casing, and presses the liquid crystal panel unit against the back casing. A metal plate that keeps the gap between the second surface and the back cover housing constant by the protrusion when an external force is applied ;
An electronic apparatus including a circuit board having a through-hole through which the protrusion penetrates, disposed in the gap, and fixed to the window frame casing .

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