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JP6485683B2 - Display device - Google Patents
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JP6485683B2 - Display device - Google Patents

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JP6485683B2
JP6485683B2 JP2014237233A JP2014237233A JP6485683B2 JP 6485683 B2 JP6485683 B2 JP 6485683B2 JP 2014237233 A JP2014237233 A JP 2014237233A JP 2014237233 A JP2014237233 A JP 2014237233A JP 6485683 B2 JP6485683 B2 JP 6485683B2
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liquid crystal
display panel
translucent
crystal display
polarizer
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JP2016099532A (en
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裕司 岡田
裕司 岡田
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Nippon Seiki Co Ltd
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Description

本発明は、液晶表示パネルを備えた表示装置に関するものである。   The present invention relates to a display device including a liquid crystal display panel.

従来より、透光性保護板に液晶表示パネルを貼着した表示装置が種々提案されており、例えば特許文献1に開示されている。斯かる表示装置は、紫外線重合性と熱重合性の両方の特性を有する樹脂からなる透光性接着剤にて、液晶表示パネルと透光性保護板とを貼着したものである。液晶表示パネルは、液晶セルと、この液晶セルの前後両面に貼着された偏光板とからなるものである。   Conventionally, various display devices in which a liquid crystal display panel is attached to a translucent protective plate have been proposed, and for example, disclosed in Patent Document 1. Such a display device is obtained by pasting a liquid crystal display panel and a translucent protective plate with a translucent adhesive made of a resin having both ultraviolet polymerizability and heat polymerizability. The liquid crystal display panel is composed of a liquid crystal cell and polarizing plates attached to both front and rear surfaces of the liquid crystal cell.

特開2009−109855号公報JP 2009-109855 A

しかしながら、液晶セルに貼着される偏光板の吸水性が良く、吸水したままの偏光板を液晶セルに貼着した場合、偏光板の水分が外へ抜けずに、高温環境下で偏光子が変色してしまい、表示品位が損なわれるという問題を有していた。
この問題を解決するため、液晶表示パネルを透光性保護板に接着する前に、偏光板の吸水状態を管理することが考えられるが、製造工程が煩雑になり、生産性が低下する虞がある。
本発明は、高温環境下でも偏光板が変色し難い表示装置を提供するものである。
However, the polarizing plate attached to the liquid crystal cell has good water absorption, and when the polarizing plate that has absorbed water is attached to the liquid crystal cell, the polarizer does not escape to the outside and the polarizer does not come out in a high temperature environment. It has a problem of discoloration and impaired display quality.
In order to solve this problem, it is conceivable to manage the water absorption state of the polarizing plate before adhering the liquid crystal display panel to the translucent protective plate. However, there is a possibility that the manufacturing process becomes complicated and the productivity is lowered. is there.
The present invention provides a display device in which a polarizing plate hardly changes color even under a high temperature environment.

本発明は、透光性保護板20と、透光性接着剤Aにて前記透光性保護板20の後側に接着された液晶表示パネル10と、を備えた表示装置であって、前記液晶表示パネル10は、透明電極が形成された一対の透光性基板に液晶を封入した液晶セル11と、前記液晶セル11の前側に設けられた前側偏光部材12と、前記液晶セル11の後側に設けられた後側偏光部材13と、を有し、 前記前側偏光部材は、前記透光性保護板側にトリアセチルセルロースからなる偏光子支持体と、前記液晶表示パネル側にリメチルメタクリレートからなる前記偏光子支持体よりも吸水率が低い偏光子支持体と、を有するものである。 The present invention is a display device comprising a translucent protective plate 20 and a liquid crystal display panel 10 adhered to the rear side of the translucent protective plate 20 with a translucent adhesive A, The liquid crystal display panel 10 includes a liquid crystal cell 11 in which liquid crystal is sealed in a pair of translucent substrates on which transparent electrodes are formed, a front polarizing member 12 provided on the front side of the liquid crystal cell 11, and the rear of the liquid crystal cell 11. the side polarization member 13 after being provided on the side, has, the front polarization member, a polarizer support comprising a triacetyl cellulose to the translucent protective plate side, port Rimechiru on the liquid crystal display panel side And a polarizer support having a lower water absorption than the polarizer support made of methacrylate.

前側偏光部材に難吸水性の偏光子支持体を設けたことにより、高温環境下でも偏光板が変色し難い。   By providing a hardly water-absorbing polarizer support on the front polarizing member, the polarizing plate is hardly discolored even in a high temperature environment.

本発明の実施形態を示す正面図。The front view which shows embodiment of this invention. 同上実施形態を示す断面図。Sectional drawing which shows embodiment same as the above. 同上実施形態を示すブロック図。The block diagram which shows embodiment same as the above. 同上実施形態を示す要部拡大図。The principal part enlarged view which shows embodiment same as the above.

以下、添付図面に基づいて、本発明の一実施形態を説明する。   Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

車両用表示装置は、液晶表示パネル10,カバーパネル(透光性保護板)20,枠体30,回路基板40,筐体50,中ケース60を備えている。液晶表示パネル10は、TFT型カラー液晶モジュールからなるものであり、車両速度等の車両情報を表示する。液晶表示パネル10は、透光性接着剤Aにてオプティカルボンディングされており、カバーパネル20の後面に接着されている。   The vehicle display device includes a liquid crystal display panel 10, a cover panel (translucent protective plate) 20, a frame 30, a circuit board 40, a housing 50, and a middle case 60. The liquid crystal display panel 10 includes a TFT color liquid crystal module, and displays vehicle information such as vehicle speed. The liquid crystal display panel 10 is optically coated with a translucent adhesive A, and is adhered to the rear surface of the cover panel 20.

透光性接着剤Aは、例えば、透明な接着剤であり、厚さは50μm〜500μmである。透光性接着剤Aは、窓部21bを覆うように形成される。透光性接着剤Aは、カバーパネル20と同等の屈折率を有しており、例えば、1.4〜1.55の屈折率を有する。透光性接着剤Aは、初期的に液状であり、製造工程の中で硬化される。液状状態では、透光性接着剤Aの粘度は、2500〜5000mPa・s程度である。   The translucent adhesive A is, for example, a transparent adhesive and has a thickness of 50 μm to 500 μm. The translucent adhesive A is formed so as to cover the window portion 21b. The translucent adhesive A has a refractive index equivalent to that of the cover panel 20, and has a refractive index of 1.4 to 1.55, for example. The translucent adhesive A is initially liquid and is cured during the manufacturing process. In the liquid state, the viscosity of the translucent adhesive A is about 2500 to 5000 mPa · s.

透光性接着剤Aは、液晶表示パネル10の接着面やカバーパネル20の線膨張係数の違いによる伸縮を吸収し、且つ、接着面に剥がれが発生しない程度の弾性、接着力を持つゲル状に硬化する。透光性接着剤Aは、生産性の高いUV硬化型であることが好ましいが、ハイブリット硬化型であっても良い。透光性接着剤Aは、シリコーン接着剤であることが好ましいが、ウレタン系、アクリル系であっても良い。   The translucent adhesive A absorbs expansion and contraction due to the difference in the linear expansion coefficient of the adhesive surface of the liquid crystal display panel 10 and the cover panel 20 and has a gel shape having elasticity and adhesive strength to such an extent that peeling does not occur on the adhesive surface. To harden. The translucent adhesive A is preferably a UV curable type with high productivity, but may be a hybrid curable type. The translucent adhesive A is preferably a silicone adhesive, but may be urethane or acrylic.

カバーパネル20は平板形状の無機ガラスからなるものであり、正面視で矩形になっている。カバーパネル20の前面には、反射防止,防汚,停電防止,赤外線カット等の機能を有するコーティングやフィルムを施しても良い。カバーパネル20は、パッキンPを介して、枠体30にて筺体50に固定されている。カバーパネル20の後面には黒色印刷層からなる遮光部21が形成されており、この遮光部21は、液晶表示パネル10の画像を透視する矩形の窓部21bと、警告表示部となる円形の窓部21cとを有している。   The cover panel 20 is made of a flat inorganic glass and has a rectangular shape when viewed from the front. The front surface of the cover panel 20 may be provided with a coating or film having functions such as antireflection, antifouling, power failure prevention, and infrared ray cut. The cover panel 20 is fixed to the housing 50 with the frame body 30 via the packing P. A light shielding portion 21 made of a black print layer is formed on the rear surface of the cover panel 20. The light shielding portion 21 has a rectangular window portion 21 b through which an image of the liquid crystal display panel 10 is seen, and a circular shape serving as a warning display portion. And a window portion 21c.

枠体30は、断面コ字状の金属枠からなるものであり、筺体50のフランジ部51に加締められている。枠体30は、カバーパネル20の側面の一部を覆うように、カバーパネル20の外周を覆っている。   The frame 30 is made of a metal frame having a U-shaped cross section, and is crimped to a flange portion 51 of the housing 50. The frame 30 covers the outer periphery of the cover panel 20 so as to cover a part of the side surface of the cover panel 20.

回路基板40は、ガラスエポキシ樹脂からなる基材に銅箔からなる配線パターンを形成したものであり、発光素子41が搭載されている。発光素子41は、遮光部21の窓部21cに対応する個所に配置されている。筐体50は、AESやPP等の樹脂からなるものである。中ケース60は、不透明な樹脂(ポリプロピレン等)からなるものであり、この中ケース60の後面側に回路基板40が配置されている。中ケース60は、発光素子41に対応する個所に形成された貫通孔61を有している。   The circuit board 40 is formed by forming a wiring pattern made of copper foil on a base material made of glass epoxy resin, and a light emitting element 41 is mounted thereon. The light emitting element 41 is disposed at a location corresponding to the window portion 21 c of the light shielding portion 21. The housing 50 is made of a resin such as AES or PP. The middle case 60 is made of an opaque resin (polypropylene or the like), and the circuit board 40 is disposed on the rear surface side of the middle case 60. The middle case 60 has a through hole 61 formed at a location corresponding to the light emitting element 41.

図3は、車両用表示装置の電気的構成を示すブロック図である。マイコン100は、CPU101,ROM102,RAM103を有している。速度センサ110は、車両速度を検出し、マイコン100に速度データを出力する。マイコン100は、ROM102に格納されている所定のプログラムに基づいて、液晶表示パネル10,発光素子41を駆動する。   FIG. 3 is a block diagram showing an electrical configuration of the vehicle display device. The microcomputer 100 has a CPU 101, a ROM 102, and a RAM 103. The speed sensor 110 detects the vehicle speed and outputs speed data to the microcomputer 100. The microcomputer 100 drives the liquid crystal display panel 10 and the light emitting element 41 based on a predetermined program stored in the ROM 102.

次に、図4に基づいて、液晶表示パネル10について詳述する。なお、図4は、理解を助けるために、液晶表示パネル10を厚さ方向に拡大して模式的に図示したものである。液晶表示パネル10は、液晶セル11,前側偏光板(前側偏光部材)12,後側偏光板(後側偏光部材)13,バックライト14を有している。   Next, the liquid crystal display panel 10 will be described in detail with reference to FIG. FIG. 4 schematically shows the liquid crystal display panel 10 enlarged in the thickness direction in order to help understanding. The liquid crystal display panel 10 includes a liquid crystal cell 11, a front polarizing plate (front polarizing member) 12, a rear polarizing plate (rear polarizing member) 13, and a backlight 14.

液晶セル11は、透明電極が形成された一対の透光性基板に液晶を封入したものである。前側偏光板12は、偏光子支持体12a,12b,偏光子12c,接着層12dを有している。前側偏光板12の偏光子12cは、偏光子支持体12aと偏光子支持体12bとに挟持されている。前側偏光板12は、接着層12dによって、液晶セル11の前面に貼着されている。後側偏光板13は、液晶セル11の後面に貼着されている。前側偏光板12は、後側偏光板13よりも難吸水性が高くなっている。   The liquid crystal cell 11 is a liquid crystal sealed in a pair of translucent substrates on which transparent electrodes are formed. The front polarizing plate 12 includes polarizer supports 12a and 12b, a polarizer 12c, and an adhesive layer 12d. The polarizer 12c of the front polarizing plate 12 is sandwiched between a polarizer support 12a and a polarizer support 12b. The front polarizing plate 12 is adhered to the front surface of the liquid crystal cell 11 by an adhesive layer 12d. The rear polarizing plate 13 is attached to the rear surface of the liquid crystal cell 11. The front polarizing plate 12 has higher water absorption than the rear polarizing plate 13.

前側偏光板12の偏光子支持体12aは、例えばトリアセチルセルロース(TAC)からなる透明樹脂からなるものである。前側偏光板12の偏光子支持体12bは、例えばポリメチルメタクリレート(PMMA)からなる透明樹脂からなるものである。偏光子支持体12bは、偏光子支持体12aよりも吸水率が低くなっている。   The polarizer support 12a of the front polarizing plate 12 is made of a transparent resin made of, for example, triacetyl cellulose (TAC). The polarizer support 12b of the front polarizing plate 12 is made of a transparent resin made of, for example, polymethyl methacrylate (PMMA). The polarizer support 12b has a lower water absorption rate than the polarizer support 12a.

本実施形態によれば、前側偏光部材12に難吸水性の偏光子支持体12bを設けたことにより、高温環境下でも偏光板が変色し難いく、表示品位が低下する虞がない。   According to the present embodiment, by providing the front polarizing member 12 with the hardly water-absorbing polarizer support 12b, there is no possibility that the polarizing plate is hardly discolored even under a high temperature environment and the display quality is not deteriorated.

10 液晶表示パネル
11 液晶セル
12 前側偏光板(前側偏光部材)
12a 偏光子支持体
12b 偏光子支持体
12c 偏光子
13 後側偏光板(後側偏光部材)
20 カバーパネル(透光性保護板)
A 透光性接着剤
DESCRIPTION OF SYMBOLS 10 Liquid crystal display panel 11 Liquid crystal cell 12 Front side polarizing plate (front side polarizing member)
12a Polarizer support 12b Polarizer support 12c Polarizer 13 Rear polarizing plate (rear polarizing member)
20 Cover panel (Translucent protective plate)
A translucent adhesive

Claims (1)

透光性保護板と、透光性接着剤にて前記透光性保護板の後側に接着された液晶表示パネルと、を備えた表示装置であって、
前記液晶表示パネルは、透明電極が形成された一対の透光性基板に液晶を封入した液晶セルと、前記液晶セルの前側に設けられた前側偏光部材と、前記液晶セルの後側に設けられた後側偏光部材と、を有し、
前記前側偏光部材は、前記透光性保護板側にトリアセチルセルロースからなる偏光子支持体と、前記液晶表示パネル側にリメチルメタクリレートからなる前記偏光子支持体よりも吸水率が低い偏光子支持体と、を有することを特徴とする表示装置。
A display device comprising: a translucent protective plate; and a liquid crystal display panel adhered to the rear side of the translucent protective plate with a translucent adhesive,
The liquid crystal display panel is provided on a liquid crystal cell in which liquid crystal is sealed in a pair of translucent substrates on which transparent electrodes are formed, a front polarizing member provided on the front side of the liquid crystal cell, and on the rear side of the liquid crystal cell. And a rear polarizing member,
The front polarization member, said a translucent protective plate side triacetylcellulose consisting polarizer support, the polarizer support polarizer lower water absorption than the body consisting of port polymethyl methacrylate in the liquid crystal display panel side And a support.
JP2014237233A 2014-11-24 2014-11-24 Display device Active JP6485683B2 (en)

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JP6793477B2 (en) * 2016-06-21 2020-12-02 三菱電機株式会社 Curved display device and its manufacturing method
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