WO2012036040A1 - Liquid crystal display device, liquid crystal panel, and flexible wiring substrate - Google Patents

Liquid crystal display device, liquid crystal panel, and flexible wiring substrate Download PDF

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Publication number
WO2012036040A1
WO2012036040A1 PCT/JP2011/070362 JP2011070362W WO2012036040A1 WO 2012036040 A1 WO2012036040 A1 WO 2012036040A1 JP 2011070362 W JP2011070362 W JP 2011070362W WO 2012036040 A1 WO2012036040 A1 WO 2012036040A1
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WO
WIPO (PCT)
Prior art keywords
liquid crystal
flexible wiring
pattern
wiring board
crystal panel
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PCT/JP2011/070362
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French (fr)
Japanese (ja)
Inventor
山中一行
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シャープ株式会社
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Publication of WO2012036040A1 publication Critical patent/WO2012036040A1/en

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    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/02—Details
    • H05K1/0277—Bendability or stretchability details
    • H05K1/028—Bending or folding regions of flexible printed circuits
    • H05K1/0281—Reinforcement details thereof
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1345—Conductors connecting electrodes to cell terminals
    • G02F1/13452—Conductors connecting driver circuitry and terminals of panels
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
    • H04M1/026—Details of the structure or mounting of specific components
    • H04M1/0266—Details of the structure or mounting of specific components for a display module assembly
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K2201/00—Indexing scheme relating to printed circuits covered by H05K1/00
    • H05K2201/09—Shape and layout
    • H05K2201/09209—Shape and layout details of conductors
    • H05K2201/09654—Shape and layout details of conductors covering at least two types of conductors provided for in H05K2201/09218 - H05K2201/095
    • H05K2201/09781—Dummy conductors, i.e. not used for normal transport of current; Dummy electrodes of components

Definitions

  • the present invention relates to a liquid crystal display device including a liquid crystal panel and a flexible wiring board connected to the liquid crystal panel.
  • an illumination device (so-called backlight device) is disposed on the opposite side (back side) to the viewing side with respect to the liquid crystal panel.
  • a flexible wiring board is connected to the liquid crystal panel.
  • the flexible wiring board may be curved and arranged on the back side of the liquid crystal panel.
  • the flexible wiring board is bent by providing a dummy wiring pattern and attaching a crease on the surface of the flexible wiring board from the folding start point to the folding end point of the flexible wiring board.
  • the repulsive force which arises is suppressed (for example, refer patent document 1).
  • the dummy wiring pattern is installed on the surface of the flexible wiring board on which the wiring pattern is provided, the dummy wiring pattern can be installed only in an empty area of the wiring pattern, and sufficient folding is possible. Can not be attached. Therefore, sufficient measures cannot be taken to suppress the repulsive force generated by bending the flexible wiring board. Therefore, it is difficult to prevent the flexible wiring board and the liquid crystal panel from floating due to the repulsive force generated by bending the flexible wiring board.
  • the dummy wiring pattern is provided on the same surface as the wiring pattern, the area for arranging the wiring pattern is reduced.
  • the present invention has been made in view of the above problems.
  • the liquid crystal display can easily prevent creases and suppress the repulsive force generated by bending the flexible wiring board, thereby preventing the flexible wiring board and the liquid crystal panel from being lifted, and avoiding adverse functional effects.
  • An object is to provide an apparatus.
  • the liquid crystal display device of the present invention includes a liquid crystal panel and a flexible wiring board connected to the liquid crystal panel and having a wiring pattern provided on one surface.
  • the flexible wiring board is curved with the one surface facing inward.
  • An exposed pattern for preventing the flexible wiring board and the liquid crystal panel from being lifted by a repulsive force generated by bending the flexible wiring board is at least the flexible wiring of the other surface of the flexible wiring board. It is provided in a portion related to the curvature of the substrate.
  • the exposed pattern for preventing the flexible wiring board and the liquid crystal panel from being lifted by the repulsive force generated by bending the flexible wiring board is the surface on which the wiring pattern of the flexible wiring board is provided. Is provided on at least a portion of the opposite surface (hereinafter referred to as the back surface) relating to the bending of the flexible wiring board. Therefore, the area where the pattern for preventing the lifting is provided is not limited to the empty area of the wiring pattern, so that it is easy to crease and repulsive force generated by bending the flexible wiring board can be suppressed. .
  • a pattern for preventing the flexible wiring board and the liquid crystal panel from floating is provided on the back surface of the flexible wiring board. Accordingly, it is possible to prevent a functional adverse effect such as increasing the wiring resistance value of the wiring pattern.
  • FIG. 1 is an exploded perspective view showing a schematic configuration of a liquid crystal display device according to Embodiment 1 of the present invention.
  • FIG. 2 is an exploded perspective view showing a state in which the flexible wiring board connected to the liquid crystal panel is curved toward the back side of the lighting device in the liquid crystal display device according to Embodiment 1 of the present invention.
  • FIG. 3A is a cross-sectional view schematically illustrating a state in which the flexible wiring board connected to the liquid crystal panel is curved toward the back side of the lighting device in the liquid crystal display device according to Embodiment 1 of the present invention.
  • FIG. 3B is a plan view showing the back surface of the flexible wiring board used in the liquid crystal display device according to Embodiment 1 of the present invention.
  • FIG. 4A is a plan view showing the back surface of the flexible wiring board used in the liquid crystal display device according to Embodiment 2 of the present invention.
  • FIG. 4B is a plan view showing the back surface of the flexible wiring board used in the liquid crystal display device according to Embodiment 3 of the present invention.
  • the exposed pattern for preventing the flexible wiring board and the liquid crystal panel from being lifted by the repulsive force generated by bending the flexible wiring board is at least the bending of the flexible wiring board on the back surface of the flexible wiring board. It is provided in the part concerning. Therefore, since the area where the exposed pattern for preventing the lifting is provided is not limited to the empty area of the wiring pattern, the flexible wiring board is likely to be folded, and the repulsion caused by bending the flexible wiring board is caused. The power can be suppressed.
  • the “repulsive force” means an elastic restoring force that tries to return from the bent state.
  • the “part related to bending” means, for example, a part of the part extending from the folding start point to the folding end point, or a part including the whole part.
  • the “repulsive force” can be generated when, for example, a polyimide film or the like is used for the base material of the flexible wiring board.
  • the exposed pattern is preferably a pattern that is uniformly continuous over the entire surface of the portion of the flexible wiring board that is curved.
  • the exposed pattern is preferably a vertical stripe pattern.
  • the exposed pattern is preferably a horizontal stripe pattern.
  • FIG. 1 is an exploded perspective view showing a schematic configuration of a liquid crystal display device 1 according to Embodiment 1 of the present invention.
  • the liquid crystal display device 1 according to the first embodiment includes a liquid crystal panel 10, a flexible wiring board (hereinafter referred to as “FPC”) 20 connected to the liquid crystal panel 10, and an illumination device 30 that illuminates the liquid crystal panel 10. .
  • FPC flexible wiring board
  • the liquid crystal panel 10 is not particularly limited, and for example, a known transmissive liquid crystal panel can be used.
  • the liquid crystal panel 10 according to the first embodiment includes a pair of translucent substrates facing each other and a liquid crystal sealed therebetween.
  • a polarizing plate is laminated on the surface of each translucent substrate opposite to the liquid crystal.
  • a drive signal for causing the liquid crystal panel 10 to perform a desired display is input to the liquid crystal panel 10 via the FPC 20.
  • the liquid crystal panel 10 is adhesively fixed to the upper surface of a holder 33 described later using a double-sided adhesive tape 11 arranged in a rectangular frame shape.
  • the FPC 20 is not particularly limited, and for example, a known flexible wiring board can be used.
  • the FPC 20 has a wiring pattern 23 made of a conductive material such as copper foil on one side of a base material sheet 36 (shown in FIG. 3A described later) made of a resin material having flexibility and insulation such as polyimide.
  • An insulating layer 37 (shown in FIG. 3A described later) (generally referred to as PSC (Photo Sensitive Coverage Film)) is formed so as to cover the wiring pattern 23.
  • PSC Photo Sensitive Coverage Film
  • An integrated circuit (IC) or the like for driving the liquid crystal panel 10 may be mounted on the FPC 20.
  • the overall shape of the FPC 20 is not particularly limited. One end of the FPC 20 is connected to one translucent substrate constituting the liquid crystal panel 10, and a terminal for connecting to a drive circuit for driving the liquid crystal panel 10 is formed at the other end.
  • the illumination device 30 includes an optical sheet 31, a light guide plate 32, a holder 33, a reflection sheet 34, and a rear bezel 35 from the liquid crystal panel 10 side.
  • the light guide plate 32 is a plate-like body made of a synthetic resin such as a transparent acrylic resin (for example, PMMA). Of the pair of substantially rectangular main surfaces of the light guide plate 32 facing each other, the main surface on the liquid crystal panel 10 side is a light emitting surface. A light source (not shown) is arranged to face one or more of the four surrounding side surfaces connecting the pair of main surfaces of the light guide plate 32. Although it does not specifically limit as a light source, For example, LED can be used. The light emitted from the light source enters the side surface of the light guide plate 32 facing the light source, is diffused by propagating through the light guide plate 32 while being totally reflected, and is emitted from the light output surface facing the liquid crystal panel 10. .
  • a synthetic resin such as a transparent acrylic resin (for example, PMMA).
  • PMMA transparent acrylic resin
  • the optical sheet 31 of this embodiment is composed of three sheets of lens sheets 31a and 31b and a diffusion sheet 31c from the liquid crystal panel 10 side.
  • the lens sheets 31a and 31b have, for example, a fine prism pattern formed on the surface on the liquid crystal panel 10 side, and improve the luminance in the front direction.
  • the diffusion sheet 31c has fine irregularities formed on one surface thereof, and diffuses light passing therethrough.
  • the above configuration of the optical sheet 31 is an example, and the present invention is not limited to this.
  • the number of sheets constituting the optical sheet 31 is not limited to three, and may be more or less.
  • the function of the optical sheet is not limited to the above. At least one of the sheets 31a, 31b, and 31c may be omitted, or a sheet having a function other than the above may be further added.
  • One sheet may have a plurality of functions.
  • the reflection sheet 34 faces the main surface opposite to the light exit surface of the light guide plate 32, and makes light leaked from the light guide plate 32 reenter the light guide plate 32 to effectively use the light.
  • the reflection sheet 34 is not particularly limited, and for example, a known reflection sheet that can be used in a lighting device can be used.
  • the material of the reflection sheet 34 is not particularly limited, and for example, an acrylic resin can be used.
  • the reflection sheet 34 may be composed of a plurality of sheets.
  • the holder 33 is a substantially rectangular frame having a rectangular opening at the center.
  • the holder 33 can be manufactured by injection molding a synthetic resin material such as polycarbonate.
  • the rear bezel 35 can be manufactured by, for example, bending a metal plate into a predetermined shape by press molding or the like.
  • FIG. 2 is a perspective view showing this state. This laminated structure is fitted into the rear bezel 35 and held. In this way, the liquid crystal display device 1 of Embodiment 1 is obtained.
  • FIG. 3A is a cross-sectional view schematically showing a state in which the FPC 20 connected to the liquid crystal panel is curved on the back side of the lighting device in the liquid crystal display device according to Embodiment 1 of the present invention.
  • FIG. 3B is a plan view showing a surface (back surface) opposite to the surface on which the wiring pattern 23 of the FPC 20 used in the liquid crystal display device according to Embodiment 1 is provided.
  • a light guide plate (not shown) and an LED (not shown) are provided between the liquid crystal panel 10 and the FPC 20.
  • the surface of the FPC 20 on which the wiring pattern 23 is provided is curved inward so that the surface of the FPC 20 on which the wiring pattern 23 is provided is opposed to the side opposite to the liquid crystal panel 10 of the lighting device. That is, the FPC 20 is folded so that the surface of the FPC 20 on which the wiring pattern 23 is provided overlaps the surface of the lighting device opposite to the liquid crystal panel 10.
  • a pattern for preventing the FPC 20 and the liquid crystal panel 10 from floating due to the repulsive force generated by bending the FPC 20 (a pattern 22 for preventing the floating).
  • the floating prevention pattern 22 is exposed in a portion related to the curvature of the FPC 20 (region 21 shown in FIG. 3B). Note that the floating prevention pattern 22 provided on the back surface of the FPC 20 is covered with an insulating layer 38 except for the curved portion.
  • a solid pattern is used as the pattern 22 for preventing lifting.
  • the solid pattern material is preferably a material that is easy to crease (plastic), and can be appropriately selected.
  • a copper foil can be used.
  • a uniformly continuous pattern is exposed on the entire surface of the portion of the back surface of the FPC 20 related to the curvature of the FPC 20 (region 21 shown in FIG. 3B).
  • the exposed pattern for preventing the flexible wiring board and the liquid crystal panel from being lifted by the repulsive force generated by bending the flexible wiring board is at least flexible on the back surface of the flexible wiring board. It is provided in the part which concerns on the curve of a wiring board. Therefore, since the area where the exposed pattern for preventing the lifting is provided is not limited to the empty area of the wiring pattern, the flexible wiring board is likely to be folded, and the repulsion caused by bending the flexible wiring board is caused. The force can prevent the flexible wiring board and the liquid crystal panel from floating.
  • an exposed pattern for preventing the flexible wiring board and the liquid crystal panel from floating is provided on the back surface of the flexible wiring board. Accordingly, it is possible to prevent a functional adverse effect such as increasing the wiring resistance value of the wiring pattern.
  • the second embodiment is different from the first embodiment with respect to the floating prevention pattern 22 provided in the FPC 20.
  • the second embodiment will be described below with a focus on differences from the first embodiment.
  • the anti-lifting pattern 22 is exposed as a uniformly continuous pattern (solid pattern).
  • the floating prevention pattern 22 is exposed in a predetermined pattern in the region 21.
  • FIG. 4A is a plan view showing a surface (back surface) opposite to the surface provided with the wiring pattern 23 of the FPC 20 used in the liquid crystal display device according to the second embodiment. Also in the second embodiment, the lifting prevention pattern 22 is provided on the back surface of the FPC 20. In the second embodiment, the floating prevention pattern 22 is exposed as a vertically striped pattern in the curved portion of the FPC 20 (region 21 shown in FIG. 4A).
  • the material for the pattern is preferably a material that is easily creased (plastic), and can be selected as appropriate.
  • a copper foil can be used.
  • FIG. 4A a vertical stripe pattern is exposed on the entire surface of a portion of the back surface of the FPC 20 related to the curvature of the FPC 20 (region 21 shown in FIG. 4A).
  • the third embodiment is different from the first and second embodiments with respect to the floating prevention pattern 22 provided in the FPC 20.
  • the third embodiment will be described with a focus on differences from the first and second embodiments.
  • the floating prevention pattern 22 is exposed as a vertical stripe pattern in the region 21.
  • the floating prevention pattern 22 is exposed as another predetermined pattern in the region 21.
  • FIG. 4B is a plan view showing the back surface of the FPC 20 used in the liquid crystal display device according to the third embodiment. Also in the third embodiment, the lifting prevention pattern 22 is provided on the back surface of the FPC 20. In the third embodiment, the floating prevention pattern 22 is exposed as a horizontal stripe pattern in the curved portion of the FPC 20 (region 21 shown in FIG. 4B).
  • the material for the pattern is preferably a material that is easily creased (plastic), and can be selected as appropriate.
  • a copper foil can be used.
  • FIG. 4B a horizontal stripe pattern is exposed on the entire surface of the FPC 20 on the back surface of the FPC 20 (the region 21 shown in FIG. 4B).
  • the pattern for preventing the lift of the present invention may be any pattern shape and substrate as long as it prevents the FPC 20 and the liquid crystal panel 10 from being lifted by the repulsive force generated by bending.
  • the present invention when the surface of the FPC 20 on which the wiring pattern is provided is folded so as to overlap the surface of the lighting device 30 opposite to the liquid crystal panel 10, that is, when the bending angle of the FPC 20 is 180 °.
  • the case where the present invention is applied has been described.
  • the present invention is not limited to this, and the present invention can be applied even when the bending angle of the FPC 20 is, for example, 90 °.
  • the present invention can be applied in any case as long as the surface on which the wiring pattern 23 is provided is inwardly curved so that a repulsive force is generated.
  • the liquid crystal display device of the present invention is not limited to that shown in FIG.
  • the present invention can be applied to all liquid crystal display devices including a curved FPC.
  • it can be applied to game machines, pachinko machines, mobile phones, personal computers, digital cameras, car navigation systems, personal audio players, digital photo frames, and the like.
  • the present invention can also be applied to a device having a curved FPC, such as an organic EL display or a plasma display.
  • the present invention can also be applied to a liquid crystal panel having a curved FPC and a curved FPC.
  • the application field of the present invention is not particularly limited, and can be used for all liquid crystal display devices including a curved FPC. Especially, it can utilize preferably for the thin liquid crystal display device used for a mobile telephone, a portable information terminal, etc. where it is difficult to arrange

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  • Physics & Mathematics (AREA)
  • Nonlinear Science (AREA)
  • Engineering & Computer Science (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Mathematical Physics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • General Physics & Mathematics (AREA)
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Abstract

Provided is a liquid crystal panel (10) to which a flexible wiring substrate (20) with a wiring pattern (23) disposed on one surface thereof is connected. Said one surface of the flexible wiring substrate is curved inwards. An exposed pattern (22) for preventing the floating up of the flexible wiring substrate and the liquid crystal panel caused by the repulsive force arising from the curving of the flexible wiring substrate is disposed in at least a section (21) affected by the curving in the flexible wiring substrate on the other surface of the flexible wiring substrate.

Description

液晶表示装置、液晶パネル、及びフレキシブル配線基板Liquid crystal display device, liquid crystal panel, and flexible wiring board
　本発明は、液晶パネルと、液晶パネルに接続されたフレキシブル配線基板とを備えた液晶表示装置に関する。 The present invention relates to a liquid crystal display device including a liquid crystal panel and a flexible wiring board connected to the liquid crystal panel.
　透過型の液晶パネルを備えた液晶表示装置においては、液晶パネルに対して視認側とは反対側（裏面側）に照明装置（いわゆるバックライト装置）が配置される。また、液晶パネルを駆動するために、液晶パネルにフレキシブル配線基板が接続される。 In a liquid crystal display device provided with a transmissive liquid crystal panel, an illumination device (so-called backlight device) is disposed on the opposite side (back side) to the viewing side with respect to the liquid crystal panel. In order to drive the liquid crystal panel, a flexible wiring board is connected to the liquid crystal panel.
　携帯電話や携帯情報端末（ＰＤＡ：Personal Data Assistant）などに使用される小型且つ薄型の液晶表示装置では、上記フレキシブル配線基板が液晶パネルの裏面側に湾曲されて配置されることがある。 In a small and thin liquid crystal display device used for a mobile phone or a personal data assistant (PDA), the flexible wiring board may be curved and arranged on the back side of the liquid crystal panel.
　そのとき、フレキシブル配線基板が湾曲されて生じる反発力により、フレキシブル配線基板と液晶パネルとを浮き上がらせる力が働き、フレキシブル配線基板の剥がれが生じやすい。そこで、従来、フレキシブル配線基板が湾曲されて生じる反発力を抑える技術が提案されている。 At that time, the repulsive force generated by bending the flexible wiring board causes a force to lift the flexible wiring board and the liquid crystal panel, and the flexible wiring board is easily peeled off. Therefore, conventionally, a technique for suppressing a repulsive force generated by bending a flexible wiring board has been proposed.
　この技術では、フレキシブル配線基板の折り返し開始点から折り返し終了点にわたって、フレキシブル配線基板の配線パターンが設けられた面に、ダミー配線パターンを設けて折り癖を付けることで、フレキシブル配線基板が湾曲されて生じる反発力を抑えている（例えば、特許文献１参照）。 In this technique, the flexible wiring board is bent by providing a dummy wiring pattern and attaching a crease on the surface of the flexible wiring board from the folding start point to the folding end point of the flexible wiring board. The repulsive force which arises is suppressed (for example, refer patent document 1).
特開２００７－１９９４９９号公報JP 2007-199499 A
　しかしながら、上記従来の技術では、フレキシブル配線基板の配線パターンが設けられた面にダミー配線パターンを設置するため、配線パターンの空き領域にしかダミー配線パターンを設置することができず、十分な折り癖を付けることができない。従って、フレキシブル配線基板が湾曲されて生じる反発力を抑えるのに、十分な対策を講じることができない。ゆえに、フレキシブル配線基板が湾曲されて生じる反発力によって、フレキシブル配線基板と液晶パネルとが浮き上がることを防止することが困難である。 However, in the above conventional technique, since the dummy wiring pattern is installed on the surface of the flexible wiring board on which the wiring pattern is provided, the dummy wiring pattern can be installed only in an empty area of the wiring pattern, and sufficient folding is possible. Can not be attached. Therefore, sufficient measures cannot be taken to suppress the repulsive force generated by bending the flexible wiring board. Therefore, it is difficult to prevent the flexible wiring board and the liquid crystal panel from floating due to the repulsive force generated by bending the flexible wiring board.
　また、ダミー配線パターンを配線パターンが設けられた面と同一面に設けた場合、配線パターンを配置する領域が減る。ダミー配線パターンを設けない場合と同一本数の配線を確保するためには、配線パターン幅、ピッチを狭める必要が生じることにより、配線パターンの配線抵抗値を上げてしまうといった機能的な悪影響が出てくる。 Also, when the dummy wiring pattern is provided on the same surface as the wiring pattern, the area for arranging the wiring pattern is reduced. In order to secure the same number of wires as in the case where no dummy wiring pattern is provided, it is necessary to reduce the wiring pattern width and pitch, resulting in a functional adverse effect such as increasing the wiring resistance value of the wiring pattern. come.
　そこで、本発明は、上記問題に鑑みてなされた。すなわち、折り癖をつき易くして、フレキシブル配線基板が湾曲されて生じる反発力を抑えることで、フレキシブル配線基板と液晶パネルの浮き上がりを防止することができると共に、機能的な悪影響を回避できる液晶表示装置を提供することを目的とする。 Therefore, the present invention has been made in view of the above problems. In other words, the liquid crystal display can easily prevent creases and suppress the repulsive force generated by bending the flexible wiring board, thereby preventing the flexible wiring board and the liquid crystal panel from being lifted, and avoiding adverse functional effects. An object is to provide an apparatus.
　本発明の液晶表示装置は、液晶パネルと、前記液晶パネルに接続され、配線パターンが一方の面に設けられたフレキシブル配線基板とを備える。前記フレキシブル配線基板が前記一方の面を内側にして湾曲されている。前記フレキシブル配線基板が湾曲されて生じる反発力によって、前記フレキシブル配線基板と前記液晶パネルとが浮き上がることを防止するための露出したパターンが、前記フレキシブル配線基板の他方の面のうち、少なくとも前記フレキシブル配線基板の湾曲に係る部分に設けられている。 The liquid crystal display device of the present invention includes a liquid crystal panel and a flexible wiring board connected to the liquid crystal panel and having a wiring pattern provided on one surface. The flexible wiring board is curved with the one surface facing inward. An exposed pattern for preventing the flexible wiring board and the liquid crystal panel from being lifted by a repulsive force generated by bending the flexible wiring board is at least the flexible wiring of the other surface of the flexible wiring board. It is provided in a portion related to the curvature of the substrate.
　本発明によれば、フレキシブル配線基板が湾曲されて生じる反発力によって、フレキシブル配線基板と液晶パネルとが浮き上がることを防止するための露出したパターンが、フレキシブル配線基板の配線パターンが設けられた面とは反対側の面（以下、裏面という）のうち、少なくともフレキシブル配線基板の湾曲に係る部分に設けられている。従って、この浮き上がりを防止するためのパターンを設ける領域が、配線パターンの空き領域に限定されることがないため、折り癖がつき易く、フレキシブル配線基板が湾曲されて生じる反発力を抑えることができる。 According to the present invention, the exposed pattern for preventing the flexible wiring board and the liquid crystal panel from being lifted by the repulsive force generated by bending the flexible wiring board is the surface on which the wiring pattern of the flexible wiring board is provided. Is provided on at least a portion of the opposite surface (hereinafter referred to as the back surface) relating to the bending of the flexible wiring board. Therefore, the area where the pattern for preventing the lifting is provided is not limited to the empty area of the wiring pattern, so that it is easy to crease and repulsive force generated by bending the flexible wiring board can be suppressed. .
　また、本発明は、フレキシブル配線基板と液晶パネルとが浮き上がることを防止するパターンがフレキシブル配線基板の裏面に設けられる。従って、配線パターンの配線抵抗値を上げてしまうといった機能的な悪影響を及ぼさないようにすることが可能となる。 In the present invention, a pattern for preventing the flexible wiring board and the liquid crystal panel from floating is provided on the back surface of the flexible wiring board. Accordingly, it is possible to prevent a functional adverse effect such as increasing the wiring resistance value of the wiring pattern.
図１は、本発明の実施形態１に係る液晶表示装置の概略構成を示した分解斜視図である。FIG. 1 is an exploded perspective view showing a schematic configuration of a liquid crystal display device according to Embodiment 1 of the present invention. 図２は、本発明の実施形態１に係る液晶表示装置において、液晶パネルに接続されたフレキシブル配線基板が照明装置の裏面側に湾曲された状態を示した分解斜視図である。FIG. 2 is an exploded perspective view showing a state in which the flexible wiring board connected to the liquid crystal panel is curved toward the back side of the lighting device in the liquid crystal display device according to Embodiment 1 of the present invention. 図３Ａは、本発明の実施形態１に係る液晶表示装置において、液晶パネルに接続されたフレキシブル配線基板が照明装置の裏面側に湾曲された状態の概略を示した断面図である。FIG. 3A is a cross-sectional view schematically illustrating a state in which the flexible wiring board connected to the liquid crystal panel is curved toward the back side of the lighting device in the liquid crystal display device according to Embodiment 1 of the present invention. 図３Ｂは、本発明の本実施形態１に係る液晶表示装置に使用されるフレキシブル配線基板の裏面を示した平面図である。FIG. 3B is a plan view showing the back surface of the flexible wiring board used in the liquid crystal display device according to Embodiment 1 of the present invention. 図４Ａは、本発明の本実施形態２に係る液晶表示装置に使用されるフレキシブル配線基板の裏面を示した平面図である。FIG. 4A is a plan view showing the back surface of the flexible wiring board used in the liquid crystal display device according to Embodiment 2 of the present invention. 図４Ｂは、本発明の本実施形態３に係る液晶表示装置に使用されるフレキシブル配線基板の裏面を示した平面図である。FIG. 4B is a plan view showing the back surface of the flexible wiring board used in the liquid crystal display device according to Embodiment 3 of the present invention.
　本発明において、フレキシブル配線基板が湾曲されて生じる反発力によって、フレキシブル配線基板と液晶パネルとが浮き上がることを防止するための露出したパターンが、フレキシブル配線基板の裏面のうち、少なくともフレキシブル配線基板の湾曲に係る部分に設けられている。従って、この浮き上がりを防止するための露出したパターンを設ける領域が、配線パターンの空き領域に限定されることがないため、フレキシブル配線基板に折り癖がつき易く、フレキシブル配線基板が湾曲されて生じる反発力を抑えることができる。ここで、「反発力」とは、曲げた状態から元に戻ろうとする弾性的な復元力のことを意味する。また、「湾曲に係る部分」とは、折り曲げ開始点から折り曲げ終了点にわたる部分の、例えば、一部、全部、又は当該部分の全部を含む部分を意味する。「反発力」は、フレキシブル配線基板の基材に、例えば、ポリイミドフィルム等が用いられている場合に発生しうる。 In the present invention, the exposed pattern for preventing the flexible wiring board and the liquid crystal panel from being lifted by the repulsive force generated by bending the flexible wiring board is at least the bending of the flexible wiring board on the back surface of the flexible wiring board. It is provided in the part concerning. Therefore, since the area where the exposed pattern for preventing the lifting is provided is not limited to the empty area of the wiring pattern, the flexible wiring board is likely to be folded, and the repulsion caused by bending the flexible wiring board is caused. The power can be suppressed. Here, the “repulsive force” means an elastic restoring force that tries to return from the bent state. Further, the “part related to bending” means, for example, a part of the part extending from the folding start point to the folding end point, or a part including the whole part. The “repulsive force” can be generated when, for example, a polyimide film or the like is used for the base material of the flexible wiring board.
　本発明において、露出したパターンは、フレキシブル配線基板の湾曲に係る部分の全面に一様に連続するパターンであることが好ましい。これにより、フレキシブル配線基板に折り癖がつき易くなり、フレキシブル配線基板と液晶パネルの浮き上がりを防止することができる。 In the present invention, the exposed pattern is preferably a pattern that is uniformly continuous over the entire surface of the portion of the flexible wiring board that is curved. As a result, the flexible wiring board can easily be creased and the floating of the flexible wiring board and the liquid crystal panel can be prevented.
　本発明において、露出したパターンは、縦縞状のパターンであることが好ましい。これにより、全面に一様に連続するパターンを設けるよりも少量の基材で、フレキシブル配線基板に折り癖をつき易くすることができる。 In the present invention, the exposed pattern is preferably a vertical stripe pattern. Thereby, it is possible to easily crease the flexible wiring board with a smaller amount of base material than to provide a uniformly continuous pattern on the entire surface.
　本発明において、露出したパターンは、横縞状のパターンであることが好ましい。これにより、全面に一様に連続するパターンを設けるよりも少量の基材で、フレキシブル配線基板に折り癖をつき易くすることができる。 In the present invention, the exposed pattern is preferably a horizontal stripe pattern. Thereby, it is possible to easily crease the flexible wiring board with a smaller amount of base material than to provide a uniformly continuous pattern on the entire surface.
　以下に、本発明を好適な実施形態を示しながら詳細に説明する。但し、本発明は以下の実施形態に限定されないことはいうまでもない。以下の説明において参照する各図は、説明の便宜上、本発明の実施形態の構成部材のうち、本発明を説明するために必要な主要部材のみを簡略化して示したものである。従って、本発明は以下の各図に示されていない任意の部材を備え得る。また、以下の各図中の寸法は、実際の寸法および寸法比率等を忠実に表したものではない。 Hereinafter, the present invention will be described in detail while showing preferred embodiments. However, it goes without saying that the present invention is not limited to the following embodiments. For convenience of explanation, the drawings referred to in the following description show only the main members necessary for explaining the present invention in a simplified manner among the constituent members of the embodiment of the present invention. Therefore, the present invention can include any member not shown in the following drawings. In addition, the dimensions in the following drawings do not faithfully represent actual dimensions, dimension ratios, and the like.
　（実施形態１）
　図１は、本発明の実施形態１に係る液晶表示装置１の概略構成を示した分解斜視図である。本実施形態１に係る液晶表示装置１は、液晶パネル１０と、液晶パネル１０に接続されたフレキシブル配線基板（以下、「ＦＰＣ」という）２０と、液晶パネル１０を照明する照明装置３０とを備える。 (Embodiment 1)
FIG. 1 is an exploded perspective view showing a schematic configuration of a liquid crystal display device 1 according to Embodiment 1 of the present invention. The liquid crystal display device 1 according to the first embodiment includes a liquid crystal panel 10, a flexible wiring board (hereinafter referred to as “FPC”) 20 connected to the liquid crystal panel 10, and an illumination device 30 that illuminates the liquid crystal panel 10. .
　液晶パネル１０は、特に限定されず、例えば、公知の透過型液晶パネルを用いることができる。本実施形態１の液晶パネル１０は、対向する一対の透光性基板と、その間に封入された液晶とを備える。各透光性基板の液晶とは反対側の面には、偏光板が積層されている。液晶パネル１０に所望の表示を行わせるための駆動信号はＦＰＣ２０を介して液晶パネル１０に入力される。液晶パネル１０は、矩形枠状に配置された両面接着テープ１１を用いて、後述するホルダー３３の上面に接着固定される。 The liquid crystal panel 10 is not particularly limited, and for example, a known transmissive liquid crystal panel can be used. The liquid crystal panel 10 according to the first embodiment includes a pair of translucent substrates facing each other and a liquid crystal sealed therebetween. A polarizing plate is laminated on the surface of each translucent substrate opposite to the liquid crystal. A drive signal for causing the liquid crystal panel 10 to perform a desired display is input to the liquid crystal panel 10 via the FPC 20. The liquid crystal panel 10 is adhesively fixed to the upper surface of a holder 33 described later using a double-sided adhesive tape 11 arranged in a rectangular frame shape.
　ＦＰＣ２０は、特に限定されず、例えば、公知のフレキシブル配線基板を用いることができる。本実施形態では、ＦＰＣ２０は、ポリイミド等の柔軟性及び絶縁性を有する樹脂材料からなる基材シート３６（後述する図３Ａに示す）の片面に、銅箔等の導電性材料による配線パターン２３（後述する図３Ａに示す）を形成し、更に、当該配線パターン２３を覆おうように絶縁層３７（後述する図３Ａに示す）（一般にＰＳＣ（Photo Sensitive Coverlayfilm）と呼ばれる）が形成されてなる。絶縁層３７として、例えばポリエステル系樹脂を使用することができる。ＦＰＣ２０上に、液晶パネル１０を駆動するための集積回路（ＩＣ）等が実装されていてもよい。ＦＰＣ２０の全体形状は特に制限はない。ＦＰＣ２０の一端は液晶パネル１０を構成する一方の透光性基板に接続され、他の一端には、液晶パネル１０を駆動する駆動回路に接続するための端子が形成されている。 The FPC 20 is not particularly limited, and for example, a known flexible wiring board can be used. In the present embodiment, the FPC 20 has a wiring pattern 23 made of a conductive material such as copper foil on one side of a base material sheet 36 (shown in FIG. 3A described later) made of a resin material having flexibility and insulation such as polyimide. An insulating layer 37 (shown in FIG. 3A described later) (generally referred to as PSC (Photo Sensitive Coverage Film)) is formed so as to cover the wiring pattern 23. As the insulating layer 37, for example, a polyester resin can be used. An integrated circuit (IC) or the like for driving the liquid crystal panel 10 may be mounted on the FPC 20. The overall shape of the FPC 20 is not particularly limited. One end of the FPC 20 is connected to one translucent substrate constituting the liquid crystal panel 10, and a terminal for connecting to a drive circuit for driving the liquid crystal panel 10 is formed at the other end.
　照明装置３０は、液晶パネル１０の側から、光学シート３１、導光板３２、ホルダー３３、反射シート３４、及びリアベゼル３５を備える。 The illumination device 30 includes an optical sheet 31, a light guide plate 32, a holder 33, a reflection sheet 34, and a rear bezel 35 from the liquid crystal panel 10 side.
　導光板３２は、透明なアクリル樹脂（例えばＰＭＭＡ）などの合成樹脂からなる板状体である。導光板３２の互いに対向する略矩形状の一対の主面のうち液晶パネル１０側の主面は光出射面である。導光板３２の一対の主面を繋ぐ周囲の４側面のうちの１つ又は複数に対向して光源（図示せず）が配置される。光源としては、特に限定されないが、例えばＬＥＤを用いることができる。光源から出射された光は、当該光源が対向する導光板３２の側面に入射し、導光板３２内を全反射しながら伝播することで拡散され、液晶パネル１０に対向する光出射面から出射する。 The light guide plate 32 is a plate-like body made of a synthetic resin such as a transparent acrylic resin (for example, PMMA). Of the pair of substantially rectangular main surfaces of the light guide plate 32 facing each other, the main surface on the liquid crystal panel 10 side is a light emitting surface. A light source (not shown) is arranged to face one or more of the four surrounding side surfaces connecting the pair of main surfaces of the light guide plate 32. Although it does not specifically limit as a light source, For example, LED can be used. The light emitted from the light source enters the side surface of the light guide plate 32 facing the light source, is diffused by propagating through the light guide plate 32 while being totally reflected, and is emitted from the light output surface facing the liquid crystal panel 10. .
　本実施形態の光学シート３１は、液晶パネル１０の側から、レンズシート３１ａ、３１ｂ、拡散シート３１ｃの３枚のシートで構成される。 The optical sheet 31 of this embodiment is composed of three sheets of lens sheets 31a and 31b and a diffusion sheet 31c from the liquid crystal panel 10 side.
　レンズシート３１ａ、３１ｂは、その液晶パネル１０側の表面に例えば微細なプリズムパターンが形成されており、正面方向の輝度を向上させる。 The lens sheets 31a and 31b have, for example, a fine prism pattern formed on the surface on the liquid crystal panel 10 side, and improve the luminance in the front direction.
　拡散シート３１ｃは、その片面に微細な凹凸等が形成されており、通過する光を拡散させる。 The diffusion sheet 31c has fine irregularities formed on one surface thereof, and diffuses light passing therethrough.
　光学シート３１の上記の構成は一例であって、本発明はこれに限定されない。光学シート３１を構成するシート数は３つに限定されず、これより多くても、少なくてもよい。光学シートの機能は上記に限定されない。上記のシート３１ａ，３１ｂ，３１ｃの少なくとも一つを省略してもよく、あるいは、上記以外の機能を有するシートを更に追加してもよい。１つのシートが複数の機能を併せ持っていてもよい。 The above configuration of the optical sheet 31 is an example, and the present invention is not limited to this. The number of sheets constituting the optical sheet 31 is not limited to three, and may be more or less. The function of the optical sheet is not limited to the above. At least one of the sheets 31a, 31b, and 31c may be omitted, or a sheet having a function other than the above may be further added. One sheet may have a plurality of functions.
　反射シート３４は、導光板３２の光出射面とは反対側の主面に対向し、導光板３２から漏れ出た光を導光板３２に再入射させて光の有効利用を図る。反射シート３４としては、特に限定されず、例えば、照明装置に使用可能な公知の反射シートを用いることができる。また、反射シート３４の材料は特に制限はないが、例えばアクリル樹脂を用いることができる。反射シート３４が複数のシートで構成されていてもよい。 The reflection sheet 34 faces the main surface opposite to the light exit surface of the light guide plate 32, and makes light leaked from the light guide plate 32 reenter the light guide plate 32 to effectively use the light. The reflection sheet 34 is not particularly limited, and for example, a known reflection sheet that can be used in a lighting device can be used. The material of the reflection sheet 34 is not particularly limited, and for example, an acrylic resin can be used. The reflection sheet 34 may be composed of a plurality of sheets.
　ホルダー３３は、中央に矩形状の開口が形成された、略矩形枠状体である。ホルダー３３は、例えばポリカーボネートなどの合成樹脂材料を射出成形することにより製造することができる。 The holder 33 is a substantially rectangular frame having a rectangular opening at the center. The holder 33 can be manufactured by injection molding a synthetic resin material such as polycarbonate.
　リアベゼル３５は、例えば金属板をプレス成形等により所定形状に折り曲げ成形して製造することができる。 The rear bezel 35 can be manufactured by, for example, bending a metal plate into a predetermined shape by press molding or the like.
　ホルダー３３上に、導光板３２、光学シート３１が順に載置され、更に、両面接着テープ１１を介して液晶パネル１０が固定される。また、ホルダー３３の中央の開口内に露出した導光板３２に反射シート３４を対向させる。そして、反射シート３４の裏面（液晶パネル１０側とは反対側の面）にＦＰＣ２０が折り返されて重ね合わせられる。折り返されたＦＰＣ２０は、ＰＥＴ（ポリエチレンテレフタレート）等の樹脂からなる両面接着テープ１２でホルダー３３に固定される。図２はこの状態を示した斜視図である。この積層構造体をリアベゼル３５に嵌め込んで保持させる。このようにして、本実施形態１の液晶表示装置１が得られる。図３Ａは、本発明の実施形態１に係る液晶表示装置において、液晶パネルに接続されたＦＰＣ２０が照明装置の裏面側に湾曲された状態の概略を示した断面図である。図３Ｂは、本実施形態１に係る液晶表示装置に使用されるＦＰＣ２０の配線パターン２３が設けられた面とは反対側の面（裏面）を示した平面図である。 The light guide plate 32 and the optical sheet 31 are placed in this order on the holder 33, and the liquid crystal panel 10 is fixed via the double-sided adhesive tape 11. Further, the reflection sheet 34 is made to face the light guide plate 32 exposed in the central opening of the holder 33. Then, the FPC 20 is folded and overlapped on the back surface of the reflection sheet 34 (the surface opposite to the liquid crystal panel 10 side). The folded FPC 20 is fixed to the holder 33 with a double-sided adhesive tape 12 made of a resin such as PET (polyethylene terephthalate). FIG. 2 is a perspective view showing this state. This laminated structure is fitted into the rear bezel 35 and held. In this way, the liquid crystal display device 1 of Embodiment 1 is obtained. FIG. 3A is a cross-sectional view schematically showing a state in which the FPC 20 connected to the liquid crystal panel is curved on the back side of the lighting device in the liquid crystal display device according to Embodiment 1 of the present invention. FIG. 3B is a plan view showing a surface (back surface) opposite to the surface on which the wiring pattern 23 of the FPC 20 used in the liquid crystal display device according to Embodiment 1 is provided.
　図３Ａに示すように、本実施形態１の液晶表示装置１では、導光板（図示省略）、ＬＥＤ（図示省略）が液晶パネル１０とＦＰＣ２０との間に設けられる。ＦＰＣ２０は、ＦＰＣ２０の配線パターン２３が設けられた面が照明装置の液晶パネル１０とは反対側に対向するように、ＦＰＣ２０の配線パターン２３が設けられた面を内側に湾曲される。すなわち、ＦＰＣ２０は、ＦＰＣ２０の配線パターン２３が設けられた面が照明装置の液晶パネル１０とは反対側の面に重なるように折り返される。しかしながら、本実施形態１では、図３Ａ、図３Ｂに示すように、ＦＰＣ２０が湾曲されて生じる反発力によって、ＦＰＣ２０と液晶パネル１０とが浮き上がることを防止するためのパターン（浮き上がり防止のパターン２２）が、ＦＰＣ２０の裏面に設けられる。この浮き上がり防止のパターン２２は、ＦＰＣ２０の湾曲に係る部分（図３Ｂに示す領域２１）において露出している。なお、ＦＰＣ２０の裏面に設けられた浮き上がり防止のパターン２２は、湾曲に係る部分以外は、絶縁層３８で覆われている。 As shown in FIG. 3A, in the liquid crystal display device 1 of Embodiment 1, a light guide plate (not shown) and an LED (not shown) are provided between the liquid crystal panel 10 and the FPC 20. The surface of the FPC 20 on which the wiring pattern 23 is provided is curved inward so that the surface of the FPC 20 on which the wiring pattern 23 is provided is opposed to the side opposite to the liquid crystal panel 10 of the lighting device. That is, the FPC 20 is folded so that the surface of the FPC 20 on which the wiring pattern 23 is provided overlaps the surface of the lighting device opposite to the liquid crystal panel 10. However, in the first embodiment, as shown in FIGS. 3A and 3B, a pattern for preventing the FPC 20 and the liquid crystal panel 10 from floating due to the repulsive force generated by bending the FPC 20 (a pattern 22 for preventing the floating). Is provided on the back surface of the FPC 20. The floating prevention pattern 22 is exposed in a portion related to the curvature of the FPC 20 (region 21 shown in FIG. 3B). Note that the floating prevention pattern 22 provided on the back surface of the FPC 20 is covered with an insulating layer 38 except for the curved portion.
　本実施形態１では、浮き上がり防止のパターン２２として、ベタパターンが用いられる。ベタパターンの材料としては、折り癖がつき易い（可塑性のある）材料が好ましく、適宜選択することができるが、例えば銅箔を用いることができる。図３Ｂに示すように、ＦＰＣ２０の裏面のうち、ＦＰＣ２０の湾曲に係る部分（図３Ｂに示す領域２１）の全面に一様に連続するパターン（ベタパターン）が露出している。 In the first embodiment, a solid pattern is used as the pattern 22 for preventing lifting. The solid pattern material is preferably a material that is easy to crease (plastic), and can be appropriately selected. For example, a copper foil can be used. As shown in FIG. 3B, a uniformly continuous pattern (solid pattern) is exposed on the entire surface of the portion of the back surface of the FPC 20 related to the curvature of the FPC 20 (region 21 shown in FIG. 3B).
　本実施形態１によれば、フレキシブル配線基板が湾曲されて生じる反発力によって、フレキシブル配線基板と液晶パネルとが浮き上がることを防止するための露出したパターンが、フレキシブル配線基板の裏面のうち、少なくともフレキシブル配線基板の湾曲に係る部分に設けられている。従って、この浮き上がりを防止するための露出したパターンを設ける領域が、配線パターンの空き領域に限定されることがないため、フレキシブル配線基板に折り癖がつき易く、フレキシブル配線基板が湾曲されて生じる反発力によって、フレキシブル配線基板と液晶パネルとが浮き上がることを防止することができる。 According to the first embodiment, the exposed pattern for preventing the flexible wiring board and the liquid crystal panel from being lifted by the repulsive force generated by bending the flexible wiring board is at least flexible on the back surface of the flexible wiring board. It is provided in the part which concerns on the curve of a wiring board. Therefore, since the area where the exposed pattern for preventing the lifting is provided is not limited to the empty area of the wiring pattern, the flexible wiring board is likely to be folded, and the repulsion caused by bending the flexible wiring board is caused. The force can prevent the flexible wiring board and the liquid crystal panel from floating.
　本実施形態１では、フレキシブル配線基板と液晶パネルとが浮き上がることを防止するための露出したパターンがフレキシブル配線基板の裏面に設けられる。従って、配線パターンの配線抵抗値を上げてしまうといった機能的な悪影響を及ぼさないようにすることが可能となる。 In the first embodiment, an exposed pattern for preventing the flexible wiring board and the liquid crystal panel from floating is provided on the back surface of the flexible wiring board. Accordingly, it is possible to prevent a functional adverse effect such as increasing the wiring resistance value of the wiring pattern.
　（実施形態２）
　本実施形態２は、ＦＰＣ２０に設けられる浮き上がり防止のパターン２２に関して実施形態１と異なる。以下に、実施形態１と異なる点を中心に本実施形態２を説明する。 (Embodiment 2)
The second embodiment is different from the first embodiment with respect to the floating prevention pattern 22 provided in the FPC 20. The second embodiment will be described below with a focus on differences from the first embodiment.
　実施形態１では、図３Ｂに示されているように、領域２１内において、浮き上がり防止のパターン２２は、一様に連続するパターン（ベタパターン）として露出していた。これに対して、本実施形態２では、浮き上がり防止のパターン２２は、領域２１内において、所定パターンで露出している。 In the first embodiment, as shown in FIG. 3B, in the region 21, the anti-lifting pattern 22 is exposed as a uniformly continuous pattern (solid pattern). On the other hand, in the second embodiment, the floating prevention pattern 22 is exposed in a predetermined pattern in the region 21.
　図４Ａは、本実施形態２に係る液晶表示装置に使用されるＦＰＣ２０の配線パターン２３が設けられた面とは反対側の面（裏面）を示した平面図である。本実施形態２でも、浮き上がり防止のパターン２２は、ＦＰＣ２０の裏面に設けられる。本実施形態２では、この浮き上がり防止のパターン２２は、ＦＰＣ２０の湾曲に係る部分（図４Ａに示す領域２１）において、縦縞状のパターンとして露出している。 FIG. 4A is a plan view showing a surface (back surface) opposite to the surface provided with the wiring pattern 23 of the FPC 20 used in the liquid crystal display device according to the second embodiment. Also in the second embodiment, the lifting prevention pattern 22 is provided on the back surface of the FPC 20. In the second embodiment, the floating prevention pattern 22 is exposed as a vertically striped pattern in the curved portion of the FPC 20 (region 21 shown in FIG. 4A).
　パターンの材料としては、折り癖がつき易い（可塑性のある）材料が好ましく、適宜選択することができるが、例えば銅箔を用いることができる。図４Ａに示すように、ＦＰＣ２０の裏面のうち、ＦＰＣ２０の湾曲に係る部分（図４Ａに示す領域２１）の全面に縦縞状のパターンが露出している。 The material for the pattern is preferably a material that is easily creased (plastic), and can be selected as appropriate. For example, a copper foil can be used. As shown in FIG. 4A, a vertical stripe pattern is exposed on the entire surface of a portion of the back surface of the FPC 20 related to the curvature of the FPC 20 (region 21 shown in FIG. 4A).
　これにより、全面に一様に連続するパターンを設けるよりも少量の基材で、フレキシブル配線基板に折り癖をつき易くすることができる。 This makes it easier to crease the flexible wiring board with a smaller amount of base material than to provide a uniform continuous pattern on the entire surface.
　（実施形態３）
　本実施形態３は、ＦＰＣ２０に設けられる浮き上がり防止のパターン２２に関して実施形態１、２と異なる。以下に、実施形態１、２と異なる点を中心に本実施形態３を説明する。 (Embodiment 3)
The third embodiment is different from the first and second embodiments with respect to the floating prevention pattern 22 provided in the FPC 20. Hereinafter, the third embodiment will be described with a focus on differences from the first and second embodiments.
　実施形態２では、浮き上がり防止のパターン２２は、領域２１内において、縦縞状のパターンとして露出していた。これに対して、本実施形態３では、浮き上がり防止のパターン２２は、領域２１内において、他の所定パターンで露出している。 In the second embodiment, the floating prevention pattern 22 is exposed as a vertical stripe pattern in the region 21. On the other hand, in the third embodiment, the floating prevention pattern 22 is exposed as another predetermined pattern in the region 21.
　図４Ｂは、本実施形態３に係る液晶表示装置に使用されるＦＰＣ２０の裏面を示した平面図である。本実施形態３でも、浮き上がり防止のパターン２２は、ＦＰＣ２０の裏面に設けられる。本実施形態３では、この浮き上がり防止のパターン２２は、ＦＰＣ２０の湾曲に係る部分（図４Ｂに示す領域２１）において、横縞状のパターンとして露出している。 FIG. 4B is a plan view showing the back surface of the FPC 20 used in the liquid crystal display device according to the third embodiment. Also in the third embodiment, the lifting prevention pattern 22 is provided on the back surface of the FPC 20. In the third embodiment, the floating prevention pattern 22 is exposed as a horizontal stripe pattern in the curved portion of the FPC 20 (region 21 shown in FIG. 4B).
　パターンの材料としては、折り癖がつき易い（可塑性のある）材料が好ましく、適宜選択することができるが、例えば銅箔を用いることができる。図４Ｂに示すように、ＦＰＣ２０の裏面のうち、ＦＰＣ２０の湾曲に係る部分（図４Ｂに示す領域２１）の全面に横縞状のパターンが露出している。 The material for the pattern is preferably a material that is easily creased (plastic), and can be selected as appropriate. For example, a copper foil can be used. As shown in FIG. 4B, a horizontal stripe pattern is exposed on the entire surface of the FPC 20 on the back surface of the FPC 20 (the region 21 shown in FIG. 4B).
　これにより、全面に一様に連続するパターンを設けるよりも少量の基材で、フレキシブル配線基板に折り癖をつき易くすることができる。 This makes it easier to crease the flexible wiring board with a smaller amount of base material than to provide a uniform continuous pattern on the entire surface.
　上記の説明では、浮き上がり防止のパターンについて、いくつかの例を説明した。しかしながら、本発明の浮き上がり防止のパターンは、湾曲されて生じる反発力によって、ＦＰＣ２０と液晶パネル１０とが浮き上がることを防止するものであれば、パターンの形状、基材はどのようなものでもよい。 In the above description, several examples of the lifting prevention pattern have been described. However, the pattern for preventing the lift of the present invention may be any pattern shape and substrate as long as it prevents the FPC 20 and the liquid crystal panel 10 from being lifted by the repulsive force generated by bending.
　また、上記の説明では、ＦＰＣ２０の配線パターンが設けられた面が照明装置３０の液晶パネル１０とは反対側の面に重なるように折り返される場合、すなわち、ＦＰＣ２０の湾曲角が１８０°の場合に、本発明を適用した場合を説明した。しかしながら、これに限らず、ＦＰＣ２０の湾曲角が、例えば、９０°の場合でも本発明を適用し得る。配線パターン２３が設けられた面を内側にして、反発力が生じる湾曲の仕方であれば、どのような場合でも本発明を適用し得る。 In the above description, when the surface of the FPC 20 on which the wiring pattern is provided is folded so as to overlap the surface of the lighting device 30 opposite to the liquid crystal panel 10, that is, when the bending angle of the FPC 20 is 180 °. The case where the present invention is applied has been described. However, the present invention is not limited to this, and the present invention can be applied even when the bending angle of the FPC 20 is, for example, 90 °. The present invention can be applied in any case as long as the surface on which the wiring pattern 23 is provided is inwardly curved so that a repulsive force is generated.
　本発明の液晶表示装置は図１に示したものに限定されない。本発明は、湾曲されたＦＰＣを備える全ての液晶表示装置に適用することができる。例えば、ゲーム機、パチンコ台、携帯電話、パーソナルコンピュータ、デジタルカメラ、カーナビゲーション、パーソナルオーディオプレイヤ、デジタルフォトフレーム等に適用可能である。また、湾曲されたＦＰＣが存在する機器、例えば、有機ＥＬディスプレイ、プラズマディスプレイ等にも適用可能である。また、本発明は、湾曲されるＦＰＣを備える液晶パネル単体、湾曲されるＦＰＣ単体にも適用することができる。 The liquid crystal display device of the present invention is not limited to that shown in FIG. The present invention can be applied to all liquid crystal display devices including a curved FPC. For example, it can be applied to game machines, pachinko machines, mobile phones, personal computers, digital cameras, car navigation systems, personal audio players, digital photo frames, and the like. Further, the present invention can also be applied to a device having a curved FPC, such as an organic EL display or a plasma display. The present invention can also be applied to a liquid crystal panel having a curved FPC and a curved FPC.
　本発明の利用分野は特に限定されず、湾曲されたＦＰＣを備える全ての液晶表示装置に利用することができる。中でも、ＦＰＣと照明装置とを離間して配置することが困難な、携帯電話や携帯情報端末などに使用される薄型の液晶表示装置に好ましく利用することができる。 The application field of the present invention is not particularly limited, and can be used for all liquid crystal display devices including a curved FPC. Especially, it can utilize preferably for the thin liquid crystal display device used for a mobile telephone, a portable information terminal, etc. where it is difficult to arrange | position an FPC and an illuminating device apart.
　以上に説明した実施形態は、いずれもあくまでも本発明の技術的内容を明らかにする意図のものであって、本発明はこのような具体例にのみ限定して解釈されるものではなく、請求の範囲に記載する範囲内でいろいろと変更して実施することができ、本発明を広義に解釈すべきである。 The embodiments described above are intended only to clarify the technical contents of the present invention, and the present invention is not construed as being limited to such specific examples. Various modifications can be made within the scope described in the scope, and the present invention should be interpreted broadly.
１　液晶表示装置
１０　液晶パネル
１１、１２　両面接着テープ
２０　フレキシブル配線基板（ＦＰＣ）
２１　ＦＰＣの配線パターン面の裏面の湾曲に係る部分
２２　浮き上がり防止のパターン
２３　配線パターン
３０　照明装置
３１　光学シート
３２　導光板
３３　ホルダー
３４　反射シート
３５　リアベゼル
３６　基材シート
３７　絶縁層
３８　絶縁層 DESCRIPTION OF SYMBOLS 1 Liquid crystal display device 10 Liquid crystal panel 11, 12 Double-sided adhesive tape 20 Flexible wiring board (FPC)
21 FPC wiring pattern surface back surface curve portion 22 Lifting prevention pattern 23 Wiring pattern 30 Lighting device 31 Optical sheet 32 Light guide plate 33 Holder 34 Reflective sheet 35 Rear bezel 36 Base sheet 37 Insulating layer 38 Insulating layer

Claims (7)

  1. 　液晶パネルと、前記液晶パネルに接続され、配線パターンが一方の面に設けられたフレキシブル配線基板とを備え、前記フレキシブル配線基板が前記一方の面を内側にして湾曲された液晶表示装置であって、
    　前記フレキシブル配線基板が湾曲されて生じる反発力によって、前記フレキシブル配線基板と前記液晶パネルとが浮き上がることを防止するための露出したパターンが、前記フレキシブル配線基板の他方の面のうち、少なくとも前記フレキシブル配線基板の湾曲に係る部分に設けられた、液晶表示装置。     A liquid crystal display device comprising: a liquid crystal panel; and a flexible wiring board connected to the liquid crystal panel and having a wiring pattern provided on one side, wherein the flexible wiring board is curved with the one side facing inward. ,
    An exposed pattern for preventing the flexible wiring board and the liquid crystal panel from floating due to a repulsive force generated by bending the flexible wiring board is at least the flexible wiring of the other surface of the flexible wiring board. A liquid crystal display device provided in a portion related to the curvature of a substrate.
  2. 　前記露出したパターンは、前記フレキシブル配線基板の湾曲に係る部分の全面に一様に連続するパターンである、請求項１に記載の液晶表示装置。 2. The liquid crystal display device according to claim 1, wherein the exposed pattern is a pattern that is continuously continuous over the entire surface of the flexible wiring board.
  3. 　前記露出したパターンは、縦縞状のパターンである、請求項１に記載の液晶表示装置。 2. The liquid crystal display device according to claim 1, wherein the exposed pattern is a vertical stripe pattern.
  4. 　前記露出したパターンは、横縞状のパターンである、請求項１に記載の液晶表示装置。 2. The liquid crystal display device according to claim 1, wherein the exposed pattern is a horizontal stripe pattern.
  5. 　前記露出したパターンは銅からなる、請求項１～４のいずれかに記載の液晶表示装置。 5. The liquid crystal display device according to claim 1, wherein the exposed pattern is made of copper.
  6. 　配線パターンが一方の面に設けられたフレキシブル配線基板を備える液晶パネルであって、
    　前記フレキシブル配線基板が前記一方の面を内側にして湾曲されて生じる反発力を抑えるための露出したパターンが、前記フレキシブル配線基板の他方の面のうち、少なくとも前記フレキシブル配線基板の湾曲に係る部分に設けられた、液晶パネル。     A liquid crystal panel comprising a flexible wiring board provided with a wiring pattern on one surface,
    The exposed pattern for suppressing the repulsive force generated when the flexible wiring board is bent with the one surface inward is at least a portion of the other surface of the flexible wiring substrate that is related to the bending of the flexible wiring substrate. A liquid crystal panel provided.
  7. 　配線パターンが一方の面に設けられたフレキシブル配線基板であって、
    　フレキシブル配線基板が前記一方の面を内側にして湾曲されて生じる反発力を抑えるための露出したパターンが、前記フレキシブル配線基板の他方の面のうち、少なくとも前記フレキシブル配線基板の湾曲に係る部分に設けられた、フレキシブル配線基板。     A flexible wiring board provided with a wiring pattern on one surface,
    An exposed pattern for suppressing a repulsive force generated when the flexible wiring board is curved with the one surface inward is provided on at least a portion of the other surface of the flexible wiring substrate that is curved. Flexible wiring board.
PCT/JP2011/070362 2010-09-16 2011-09-07 Liquid crystal display device, liquid crystal panel, and flexible wiring substrate WO2012036040A1 (en)

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