JPH08313707A - Light controlling functional sheet for liquid crystal display device and its production - Google Patents

Light controlling functional sheet for liquid crystal display device and its production

Info

Publication number
JPH08313707A
JPH08313707A JP7142433A JP14243395A JPH08313707A JP H08313707 A JPH08313707 A JP H08313707A JP 7142433 A JP7142433 A JP 7142433A JP 14243395 A JP14243395 A JP 14243395A JP H08313707 A JPH08313707 A JP H08313707A
Authority
JP
Japan
Prior art keywords
light
functional sheet
thermoplastic resin
display device
crystal display
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP7142433A
Other languages
Japanese (ja)
Other versions
JP3732252B2 (en
Inventor
Yasuki Suzuura
泰樹 鈴浦
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dai Nippon Printing Co Ltd
Original Assignee
Dai Nippon Printing Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dai Nippon Printing Co Ltd filed Critical Dai Nippon Printing Co Ltd
Priority to JP14243395A priority Critical patent/JP3732252B2/en
Publication of JPH08313707A publication Critical patent/JPH08313707A/en
Application granted granted Critical
Publication of JP3732252B2 publication Critical patent/JP3732252B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
    • B29C43/222—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length characterised by the shape of the surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C59/00—Surface shaping of articles, e.g. embossing; Apparatus therefor
    • B29C59/02—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing
    • B29C59/04—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing using rollers or endless belts
    • B29C59/046—Surface shaping of articles, e.g. embossing; Apparatus therefor by mechanical means, e.g. pressing using rollers or endless belts for layered or coated substantially flat surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/00009—Production of simple or compound lenses
    • B29D11/00278—Lenticular sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
    • B29D11/00—Producing optical elements, e.g. lenses or prisms
    • B29D11/0073—Optical laminates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/30—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by a layer formed with recesses or projections, e.g. hollows, grooves, protuberances, ribs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/06—Embossing
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
    • G02B5/0215—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having a regular structure
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0205—Diffusing elements; Afocal elements characterised by the diffusing properties
    • G02B5/0236—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element
    • G02B5/0242—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place within the volume of the element by means of dispersed particles
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0268—Diffusing elements; Afocal elements characterized by the fabrication or manufacturing method
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/02—Diffusing elements; Afocal elements
    • G02B5/0273—Diffusing elements; Afocal elements characterized by the use
    • G02B5/0278—Diffusing elements; Afocal elements characterized by the use used in transmission
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/04—Prisms
    • G02B5/045—Prism arrays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/44—Compression means for making articles of indefinite length
    • B29C43/46—Rollers
    • B29C2043/461—Rollers the rollers having specific surface features
    • B29C2043/463—Rollers the rollers having specific surface features corrugated, patterned or embossed surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2011/00—Optical elements, e.g. lenses, prisms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2011/00—Optical elements, e.g. lenses, prisms
    • B29L2011/0016—Lenses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/15—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
    • B32B37/153—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state at least one layer is extruded and immediately laminated while in semi-molten state

Abstract

PURPOSE: To produce a light controlling functional sheet used in a back light system for a liq. crystal display device. CONSTITUTION: A thermoplastic resin is laminated on a substrate made of a thermoplastic resin film by an extrusion lamination method and a prism shape is imparted to obtain the objective light controlling functional sheet. This functional sheet is produced by extrusion-coating the surface of the substrate with the thermoplastic resin by the extrusion lamination method and pressing the thermoplastic resin against a cooling roll 1 having a prism shape on the surface at the same time.

Description

【発明の詳細な説明】Detailed Description of the Invention

【０００１】[0001]

【産業上の利用分野】本発明は液晶表示装置用バックラ
イトシステムに用いられる光制御機能性シート及びその
製造方法に関する。本発明において光制御機能性シート
とは、液晶表示装置用レンズシートや液晶表示装置用光
拡散シート兼レンズシートのことである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a light control functional sheet used in a backlight system for a liquid crystal display device and a manufacturing method thereof. In the present invention, the light control functional sheet is a lens sheet for a liquid crystal display device or a light diffusion sheet / lens sheet for a liquid crystal display device.

【０００２】[0002]

【従来の技術】従来、液晶表示装置用バックライトには
エッジライト方式が多く用いられている。エッジライト
型バックライトは一般に、透光性材料からなる導光板
と、その側面端部に設けられた冷陰極管等からなる線光
源と、導光板の下面と線光源を覆うように配置された光
反射フィルムと、出光面となる導光板の上面に配置され
た光拡散フィルムやレンズシートで構成される。近年、
輝度の向上及び消費電力の低下を目的として、特にカラ
ー液晶表示装置においては、光拡散フィルムの上面もし
くは光拡散フィルムと導光板の間に表面にプリズム形状
を有するレンズシートを１枚もしくは２枚配置すること
が多くなった。また、光源からの距離により出光量の不
均一を改善するため、導光板の裏面には光拡散インキか
らなるドット状のパターンが、光源から離れるにしたが
って大きくなるように印刷されている。光拡散フィルム
は、光を均一に拡散し、導光板の裏面に印刷されたドッ
ト状パターンを見えなくすることを主目的として配置さ
れ、レンズシートは導光板から出射した光を効率良く液
晶パネルの正面方向に集光するために、光拡散フィルム
の上面もしくは光拡散フィルムと導光板の間に１枚もし
くは２枚配される。2. Description of the Related Art Conventionally, an edge light system has been widely used as a backlight for a liquid crystal display device. The edge light type backlight is generally arranged so as to cover the light guide plate made of a translucent material, a line light source made of a cold cathode tube or the like provided at the side end of the light guide plate, and the lower surface of the light guide plate and the line light source. It is composed of a light reflecting film and a light diffusing film or lens sheet arranged on the upper surface of the light guide plate which is the light emitting surface. recent years,
For the purpose of improving brightness and reducing power consumption, particularly in a color liquid crystal display device, one or two lens sheets having a prism shape on the surface of the light diffusion film or between the light diffusion film and the light guide plate are arranged. I have a lot of things. Further, in order to improve the non-uniformity of the emitted light amount depending on the distance from the light source, a dot-like pattern made of light diffusion ink is printed on the back surface of the light guide plate so as to increase with distance from the light source. The light diffusion film is arranged for the main purpose of uniformly diffusing light and obscuring the dot pattern printed on the back surface of the light guide plate, and the lens sheet efficiently reflects the light emitted from the light guide plate of the liquid crystal panel. In order to collect light in the front direction, one or two sheets are arranged on the upper surface of the light diffusion film or between the light diffusion film and the light guide plate.

【０００３】[0003]

【発明が解決しようとする課題】しかし、従来、これら
のレンズシートは熱可塑性シートのエンボス加工や電離
放射線硬化型樹脂を利用したプリズム形状の転写などに
より製造されていた。しかしこれら従来のレンズシート
は製造コストが高く、ひいてはバックライトシステムが
高価となる主要因とされてきた。また、従来のレンズシ
ートはその製造方法より、プリズム形状が形成される層
の材質の選択範囲が狭いという問題もあった。さらに、
レンズシートは光拡散効果を有しないため、必ず光拡散
フィルムと組み合わせて使用しなければならず、バック
ライトの組み立て工程が煩雑になるという問題もあっ
た。However, these lens sheets have hitherto been manufactured by embossing a thermoplastic sheet or transferring a prism shape using an ionizing radiation curable resin. However, these conventional lens sheets have been considered to be the main reason for the high manufacturing cost and the high cost of the backlight system. In addition, the conventional lens sheet has a problem that the material range of the layer in which the prism shape is formed is narrower than that of the manufacturing method thereof. further,
Since the lens sheet does not have a light diffusing effect, it must be used in combination with a light diffusing film, and the backlight assembly process becomes complicated.

【０００４】[0004]

【課題を解決するための手段】そこで、このような問題
を解決するためになされた本発明は、以下の４つであ
る。すなわち、 （請求項１） 熱可塑性樹脂フィルムからなる基材に、
熱可塑性樹脂が押し出しラミネーション法により積層さ
れプリズムとしてなることを特徴とする液晶表示装置用
光制御機能性シート。 （請求項２） 熱可塑性樹脂フィルムからなる基材に、
光拡散層、該プリズムが、積層されていることを特徴と
する請求項１記載の液晶表示装置用光制御機能性シー
ト。 （請求項３） 熱可塑性樹脂フィルムからなる基材の片
面に、光拡散層、該プリズムが積層され、基材のもう一
方の面にはマット層が形成されていることを特徴とする
請求項１記載の液晶表示装置用光制御機能性シート。 （請求項４） 熱可塑性樹脂フィルムからなる基材の表
面に、押し出しラミネート法により、熱可塑性樹脂を押
し出しコーティングすると同時に表面にプリズム形状を
有する冷却ロールに押圧することを特徴とする液晶表示
装置用光制御機能性シートの製造方法。である。The present invention, which has been made in order to solve such problems, is the following four. That is, (Claim 1) A base material made of a thermoplastic resin film,
A light control functional sheet for a liquid crystal display device, characterized in that a thermoplastic resin is laminated by an extrusion lamination method to form a prism. (Claim 2) A substrate made of a thermoplastic resin film,
The light control functional sheet for a liquid crystal display device according to claim 1, wherein the light diffusion layer and the prism are laminated. (Claim 3) A light diffusion layer and the prism are laminated on one surface of a base material made of a thermoplastic resin film, and a mat layer is formed on the other surface of the base material. 1. A light control functional sheet for a liquid crystal display device according to 1. (Claim 4) For a liquid crystal display device, characterized in that a thermoplastic resin is extrusion-coated on the surface of a base material made of a thermoplastic resin film by an extrusion laminating method and at the same time a cooling roll having a prism shape on the surface is pressed. Manufacturing method of light control functional sheet. Is.

【０００５】本発明の熱可塑性樹脂フィルムからなる基
材（押し出しラミネート用基材）は、単層もしくは複合
フィルムもしくはシートでその厚みとしては通常５〜２
００μｍが好ましく、さらに好ましくは１０〜１２５μ
ｍのものを使用できる。この基材の素材の具体例を示す
と、ポリエチレンテレフタレート、ポリブチレンテレフ
タレート、ポリエチレンテレフタレート・イソフタレー
ト共重合体等によるポリエステル系樹脂、ポリエチレ
ン、ポリプロピレン、ポリメチルペンテン等のポリオレ
フィン系樹脂、ポリフッ化塩化ビニル、ポリフッ化ビニ
リデン、ポリ４フッ化エチレン、エチレン・４フッ化エ
チレン共重合体等によるポリフッ化エチレン系樹脂、ナ
イロン６ナイロン６６等によるポリアミド系樹脂、ポリ
塩化ビニル、塩化ビニル・酢酸ビニル共重合体、エチレ
ン・ビニルアルコール共重合体、ポリビニルアルコール
等のビニル系樹脂、三酢酸セルロース、セロファン等に
よるセルロース系樹脂、ポリメタクリル酸メチル、ポリ
メタクリル酸エチル、ポリアクリル酸ブチル等のアクリ
ル系樹脂、耐衝撃性ポリスチレン、ポリカーボネート、
ポリアリレート、ポリイミド等があげられる。The base material (base material for extrusion lamination) made of the thermoplastic resin film of the present invention is a single layer or a composite film or sheet and its thickness is usually 5 to 2
00 μm is preferable, and more preferably 10 to 125 μm.
m can be used. Specific examples of the material of this base material include polyethylene terephthalate, polybutylene terephthalate, polyester resins such as polyethylene terephthalate / isophthalate copolymer, polyolefin resins such as polyethylene, polypropylene and polymethylpentene, and polyvinyl fluoride chloride. , Polyvinylidene fluoride, Polytetrafluoroethylene, Polyethylene fluoride based on ethylene / tetrafluoroethylene copolymer, Polyamide based nylon 6 nylon 66, Polyvinyl chloride, Vinyl chloride / vinyl acetate copolymer , Ethylene-vinyl alcohol copolymer, vinyl resin such as polyvinyl alcohol, cellulose triacetate, cellulosic resin such as cellophane, polymethyl methacrylate, polyethyl methacrylate, polybutyl acrylate Acrylic resins, high impact polystyrene, polycarbonate,
Examples include polyarylate and polyimide.

【０００６】本発明において基材に光拡散層を形成して
光拡散フィルムを製造する方法としては、例えば 基材に光拡散剤を練り込んだ樹脂を押し出しラミネ
ーションにより積層する方法 基材に光拡散剤をバインダー樹脂に分散した光拡散
層用コーティング剤を塗工形成する方法 光拡散剤を練り込んだフィルムを基材とドライラミ
する方法 が利用される。光拡散剤としては、アクリル樹脂、メラ
ミン樹脂、ポリエチレン、ポリスチレン、有機シリコー
ン樹脂、アクリル−スチレン共重合体等の有機質微粒子
及び炭酸カルシウム、シリカ、酸化アルミニウム、炭酸
バリウム、硫酸バリウム、ガラス等の無機質微粒子で平
均粒子径１〜４０μｍの単体もしくは混合体である。In the present invention, a method for producing a light diffusing film by forming a light diffusing layer on a substrate includes, for example, a method of extruding a resin in which a light diffusing agent is kneaded into a substrate and laminating the resin by lamination. A method of coating and forming a coating agent for a light diffusion layer in which the agent is dispersed in a binder resin A method of dry laminating a film in which the light diffusion agent is kneaded with a substrate is used. As the light diffusing agent, organic fine particles such as acrylic resin, melamine resin, polyethylene, polystyrene, organic silicone resin, acrylic-styrene copolymer and inorganic fine particles such as calcium carbonate, silica, aluminum oxide, barium carbonate, barium sulfate, and glass. It is a simple substance or a mixture having an average particle diameter of 1 to 40 μm.

【０００７】本発明において光拡散フィルムとは、前記
した基材と光拡散層とからなるものと図２に示したよう
に、さらにマット層を形成したものとの２種類がある。
そして、本発明において基材にマット層を形成する方法
としては、 基材にマット剤を練り込んだ樹脂を押し出しラミネ
ーションにより積層する方法 基材にマット剤をバインダー樹脂に分散したコーテ
ィング剤を塗工形成する方法 が利用される。マット層用マット剤としては、アクリル
樹脂、メラミン樹脂、ポリエチレン、ポリスチレン、有
機シリコーン樹脂、アクリル−スチレン共重合体等の有
機質微粒子及び炭酸カルシウム、シリカ、酸化アルミニ
ウム、炭酸バリウム、硫酸バリウム、ガラス等の無機質
微粒子で平均粒子径３〜２０μｍの単体もしくは混合体
である。In the present invention, there are two types of light diffusing film, one consisting of the above-mentioned base material and the light diffusing layer, and the other having a mat layer formed thereon as shown in FIG.
In the present invention, as a method of forming a mat layer on a substrate, a method of extruding a resin in which a mat agent is kneaded into a substrate and laminating it by lamination is applied. A coating agent in which a mat agent is dispersed in a binder resin is applied to a substrate. The method of forming is utilized. Examples of the matting agent for the matte layer include organic fine particles such as acrylic resin, melamine resin, polyethylene, polystyrene, organic silicone resin, and acrylic-styrene copolymer, and calcium carbonate, silica, aluminum oxide, barium carbonate, barium sulfate, and glass. It is a single substance or a mixture of inorganic fine particles having an average particle diameter of 3 to 20 μm.

【０００８】本発明の光拡散層用コーティング剤及びマ
ット層用コーティング剤のバインダー樹脂としては、ポ
リウレタン，ポリエチレンテレフタレート、ポリブチレ
ンテレフタレート、ポリエチレンテレフタレート・イソ
フタレート共重合体等によるポリエステル系樹脂、ポリ
エチレン、ポリプロピレン、ポリメチルペンテン等のポ
リオレフィン系樹脂、ポリフッ化塩化ビニル、ポリフッ
化ビニリデン、ポリ４フッ化エチレン、エチレン・４フ
ッ化エチレン共重合体等によるポリフッ化エチレン系樹
脂、ナイロン６ナイロン６６等によるポリアミド系樹
脂、ポリ塩化ビニル、塩化ビニル・酢酸ビニル共重合
体、ポリビニルブチラール、エチレン・ビニルアルコー
ル共重合体、ポリビニルアルコール等のビニル系樹脂、
三酢酸セルロース、セロファン等によるセルロース系樹
脂、ポリメタクリル酸メチル、ポリメタクリル酸エチ
ル、ポリアクリル酸ブチル等のアクリル系樹脂、アクリ
ロニトリル−ブタジエン共重合体、ポリスチレン、ポリ
カーボネート、ポリアリレート、ポリイミド等の単独も
しくは混合物やさらにイソシアネート等の架橋剤を配合
しても良い。As the binder resin of the coating agent for the light diffusion layer and the coating agent for the matte layer of the present invention, polyester resin such as polyurethane, polyethylene terephthalate, polybutylene terephthalate, polyethylene terephthalate / isophthalate copolymer, polyethylene, polypropylene. Polyolefin resin such as polymethylpentene, polyvinyl fluoride chloride, polyvinylidene fluoride, polytetrafluoroethylene, polyfluoroethylene resin such as ethylene / tetrafluoroethylene copolymer, polyamide system such as nylon 6 nylon 66 Resin, polyvinyl chloride, vinyl chloride / vinyl acetate copolymer, polyvinyl butyral, ethylene / vinyl alcohol copolymer, vinyl resin such as polyvinyl alcohol,
Cellulose triacetate, cellulosic resin such as cellophane, acrylic resin such as polymethyl methacrylate, polyethyl methacrylate, polybutyl acrylate, acrylonitrile-butadiene copolymer, polystyrene, polycarbonate, polyarylate, polyimide alone or A mixture or a crosslinking agent such as isocyanate may be added.

【０００９】本発明の押し出しコーティングする熱可塑
性樹脂（プリズム用押し出し樹脂）としては、ポリエチ
レンテレフタレート、ポリブチレンテレフタレート、ポ
リエチレンテレフタレート・イソフタレート共重合体等
によるポリエステル系樹脂、ポリエチレン、ポリプロピ
レン、ポリメチルペンテン等のポリオレフィン系樹脂、
ポリフッ化塩化ビニル、ポリフッ化ビニリデン、ポリ４
フッ化エチレン、エチレン・４フッ化エチレン共重合体
等によるポリフッ化エチレン系樹脂、ナイロン６ナイロ
ン６６等によるポリアミド系樹脂、ポリ塩化ビニル、塩
化ビニル・酢酸ビニル共重合体、エチレン・ビニルアル
コール共重合体、ポリビニルアルコール等のビニル系樹
脂、三酢酸セルロース、セロファン等によるセルロース
系樹脂、ポリメタクリル酸メチル、ポリメタクリル酸エ
チル、ポリアクリル酸ブチル等のアクリル系樹脂、ポリ
スチレン、ポリカーボネート、ポリアリレート、ポリイ
ミド等の単独もしくは混合体もしくは共重合体があげら
れる。Examples of the thermoplastic resin (extrusion resin for prisms) to be extrusion coated according to the present invention include polyester resins such as polyethylene terephthalate, polybutylene terephthalate, polyethylene terephthalate / isophthalate copolymers, polyethylene, polypropylene, polymethylpentene, etc. Polyolefin resin,
Polyvinyl fluoride chloride, polyvinylidene fluoride, poly 4
Polyfluorinated ethylene resin such as fluorinated ethylene, ethylene / tetrafluoroethylene copolymer, polyamide resin such as nylon 6 nylon 66, polyvinyl chloride, vinyl chloride / vinyl acetate copolymer, ethylene / vinyl alcohol copolymer Polymers, vinyl resins such as polyvinyl alcohol, cellulose triacetate, cellulosic resins such as cellophane, acrylic resins such as polymethylmethacrylate, polyethylmethacrylate, and polybutylacrylate, polystyrene, polycarbonate, polyarylate, polyimide, etc. And a homopolymer, a mixture thereof, or a copolymer thereof.

【００１０】次に、本発明において光制御機能性シート
の一方の表面に図４〜図８に示したような形状のプリズ
ムを形成するには、少なくとも熱可塑性樹脂フィルムか
らなる基材の表面に、押し出しラミネート法により、熱
可塑性樹脂を押し出しコーティングすると同時に表面に
プリズム形状を有する冷却ロールに押圧し冷却する方法
がある。形状としては、導光板からの出射光を法線方向
に集光できる形状、例えば図４の様な三角プリズムを多
数平行に配置した形状などが好ましい。前記プリズム形
状を有する冷却ロールの製造方法としては、冷却ロール
の表面に直接、彫刻あるいは腐食等の方法でプリズム形
状を形成しても良いし、プリズム形状を形成した金属あ
るいは樹脂などからなるスタンパなどを冷却ロール表面
に形成しても良い。Next, in the present invention, in order to form a prism having a shape as shown in FIGS. 4 to 8 on one surface of the light control functional sheet, at least the surface of the base material made of a thermoplastic resin film is formed. There is a method in which a thermoplastic resin is extrusion-coated by an extrusion laminating method, and at the same time, a cooling roll having a prism shape on the surface is pressed and cooled. As the shape, a shape capable of condensing the light emitted from the light guide plate in the normal direction, for example, a shape in which a large number of triangular prisms as shown in FIG. 4 are arranged in parallel is preferable. As a method of manufacturing the cooling roll having the prism shape, the prism shape may be directly formed on the surface of the cooling roll by a method such as engraving or corrosion, or a stamper made of a metal or a resin having the prism shape is formed. May be formed on the surface of the cooling roll.

【００１１】[0011]

【作用】光拡散層の役目は、導光板から出た光を均一に
拡散し、導光板裏面のドット状パターンを見えなくする
ことである。マット層は必ずしも必要ではないが、その
役目は、導光板とのスティッキング防止のためである。
本発明の光制御機能性シートは押し出しラミネート法に
より冷却ロールの表面に形成されたプリズム形状を溶融
押し出しされた熱可塑性樹脂シートの表面に転写するも
のであり、従来に比較して、低コストで大量生産に適し
た液晶表示装置用レンズシートおよびその製造方法を提
供するものである。さらに、押し出しラミネートする基
材として光拡散層が形成されている光拡散フィルムを使
用することによりレンズシートと光拡散フィルムを一体
化でき、液晶表示装置用バックライトの組み立て工程を
簡略化することができる。The function of the light diffusion layer is to uniformly diffuse the light emitted from the light guide plate so that the dot pattern on the back surface of the light guide plate cannot be seen. The mat layer is not always necessary, but its role is to prevent sticking with the light guide plate.
The light control functional sheet of the present invention is to transfer the prism shape formed on the surface of the cooling roll by the extrusion laminating method to the surface of the melt extruded thermoplastic resin sheet, and at a low cost as compared with the conventional one. A lens sheet for a liquid crystal display device suitable for mass production and a method for manufacturing the same. Furthermore, by using a light diffusion film having a light diffusion layer formed as a base material for extrusion lamination, the lens sheet and the light diffusion film can be integrated, and the process of assembling the backlight for a liquid crystal display device can be simplified. it can.

【００１２】[0012]

【実施例】本発明の実施例を図面により説明する。図１
は本発明による光制御機能性シートの製造方法の一実施
例を示す断面図である。図２は本発明による光制御機能
性シートに使用される光拡散フィルムの一実施例を示し
た断面図である。図３は本発明による光制御機能性シー
ト（光拡散フィルム兼レンズシート）の一実施例を示し
た断面図である。図４〜図８は本発明による光制御機能
性シートの表面に形成されたプリズム形状の実施例を示
した斜視図である。Embodiments of the present invention will be described with reference to the drawings. FIG.
FIG. 3 is a cross-sectional view showing one embodiment of a method for manufacturing a light control functional sheet according to the present invention. FIG. 2 is a sectional view showing an embodiment of a light diffusion film used in the light control functional sheet according to the present invention. FIG. 3 is a sectional view showing an embodiment of the light control functional sheet (light diffusion film / lens sheet) according to the present invention. 4 to 8 are perspective views showing examples of prism shapes formed on the surface of the light control functional sheet according to the present invention.

【００１３】実施例１ 図２において、基材６として厚さ２５μｍのポリエステ
ルフィルム〔帝人（株）製 ＨＳタイプ〕の片面に、下
記組成の光拡散層用コーティング剤をコンマコート法に
より塗布後、乾燥し、厚さ１５μの光拡散層５を形成し
た。次いでポリエステルフィルムのもう一方の面に、下
記組成のマット層用コーティング剤を塗布前に主剤と硬
化剤を１００／３（重量比）の割合で混合し、グラビア
リバースコート法（グラビア版版深２０μ、２３０線／
ｉｎｃｈ）により塗布後乾燥し、厚さ５μｍのマット層
７を形成して、押し出しラミネート基材となる図１や図
２の光拡散フィルム４を得た。 光拡散層用コーティング剤の組成 バインダー ウレタン樹脂（屈折率１．４５） ３５重量部 光拡散剤 メラミン樹脂ビーズ （平均粒子径３μｍ・屈折率１．５７） １５重量部 溶剤 トルエン ２５重量部 メチルエチルケトン ２５重量部 マット層用コーティング剤の組成 主剤 バインダー ポリエステル樹脂（東洋紡績バイロン♯２００） ３０重量部 マット剤 マイクロシリカ（平均粒子径５μｍ） １重量部 溶剤 トルエン ３５重量部 メチルエチルケトン ３４重量部 硬化剤 キシレンジイソシアネート ７５重量部 溶剤 酢酸エチル ２５重量部 図１の押し出しラミネート装置において、前記光拡散フ
ィルムの光拡散層５面に、プリズムを形成する層として
ポリオレフィンを押し出すと同時に、表面に図４のプリ
ズム形状を形成したシート状の版を貼りつけた冷却ロー
ル１にニップロール２により押圧、冷却することにより
表面にプリズム形状を有する図３に示す液晶表示装置用
光制御機能性シート（光拡散シート兼レンズシート）８
を得た。 Example 1 In FIG. 2, one side of a 25 μm thick polyester film [HS type manufactured by Teijin Ltd.] as a base material 6 was coated with a coating agent for a light diffusing layer having the following composition by a comma coating method. After drying, a light diffusion layer 5 having a thickness of 15 μm was formed. Next, on the other side of the polyester film, a main agent and a curing agent were mixed at a ratio of 100/3 (weight ratio) before coating a matting layer coating agent having the following composition, followed by a gravure reverse coating method (gravure plate depth 20 μm). , 230 lines /
Inch) and then dried to form a matte layer 7 having a thickness of 5 μm to obtain a light diffusion film 4 shown in FIGS. Composition of coating agent for light-diffusing layer Binder urethane resin (refractive index 1.45) 35 parts by weight Light-diffusing agent melamine resin beads (average particle size 3 μm, refractive index 1.57) 15 parts by weight solvent toluene 25 parts by weight methyl ethyl ketone 25 parts by weight Part Composition of coating agent for matte layer Main agent Binder Polyester resin (Toyobo Byron # 200) 30 parts by weight Matting agent Micro silica (average particle size 5 μm) 1 part by weight Solvent Toluene 35 parts by weight Methyl ethyl ketone 34 parts by weight Curing agent Xylene diisocyanate 75 parts by weight Part Solvent Ethyl acetate 25 parts by weight In the extrusion laminating apparatus shown in FIG. 1, a sheet is formed by extruding polyolefin as a layer for forming a prism on the surface of the light diffusion layer 5 of the light diffusion film, and at the same time, forming the prism shape of FIG. The plate Ritsuke was pressed against the cooling roll 1 by nip roll 2, a liquid crystal display device for light control functionality sheet shown in FIG. 3 having a prismatic shape on the surface by cooling (light diffusion sheet and lens sheet) 8
I got

【００１４】[0014]

【発明の効果】本発明の光制御機能性シートは押し出し
ラミネート法により冷却ロールの表面に形成されたプリ
ズム形状を溶融押し出しされた熱可塑性樹脂シートの表
面に転写するものであり、従来に比較して、低コストで
大量生産に適した液晶表示装置用光制御機能性シートお
よびその製造方法を提供することができる。また、溶融
押し出し可能な樹脂であればいずれの樹脂も光制御機能
性シート（レンズシート）材料として使用できる。さら
に、押し出しラミネートする基材として光拡散層が形成
されている光拡散フィルムを使用することによりレンズ
シートと光拡散フィルムを一体化でき、液晶表示装置用
バックライトの組み立て工程を簡略化することができ
る。The light control functional sheet of the present invention transfers the prism shape formed on the surface of the cooling roll by the extrusion laminating method to the surface of the melt extruded thermoplastic resin sheet. Thus, it is possible to provide a light control functional sheet for a liquid crystal display device, which is suitable for mass production at low cost, and a manufacturing method thereof. Any resin that can be melt-extruded can be used as the light control functional sheet (lens sheet) material. Furthermore, by using a light diffusion film having a light diffusion layer formed as a base material for extrusion lamination, the lens sheet and the light diffusion film can be integrated, and the process of assembling the backlight for a liquid crystal display device can be simplified. it can.

【図面の簡単な説明】[Brief description of drawings]

【図１】本発明による光制御機能性シートの製造方法の
一実施例を示す断面図FIG. 1 is a sectional view showing an embodiment of a method for manufacturing a light control functional sheet according to the present invention.

【図２】本発明による光制御機能性シートに使用される
光拡散フィルムの一実施例を示した断面図である。FIG. 2 is a cross-sectional view showing an example of a light diffusion film used in the light control functional sheet according to the present invention.

【図３】本発明による光制御機能性シート（光拡散フィ
ルム兼レンズシート）の一実施例を示した断面図であ
る。FIG. 3 is a sectional view showing an embodiment of a light control functional sheet (light diffusion film / lens sheet) according to the present invention.

【図４】本発明による光制御機能性シートの表面に形成
されたプリズム形状の実施例を示した斜視図である。FIG. 4 is a perspective view showing an example of a prism shape formed on the surface of the light control functional sheet according to the present invention.

【図５】本発明による光制御機能性シートの表面に形成
されたかまぼこ型プリズム形状の実施例を示した斜視図FIG. 5 is a perspective view showing an example of a kamaboko prism type formed on the surface of the light control functional sheet according to the present invention.

【図６】本発明による光制御機能性シートの表面に形成
されたプリズム形状の実施例を示した斜視図である。FIG. 6 is a perspective view showing an example of a prism shape formed on the surface of the light control functional sheet according to the present invention.

【図７】本発明による光制御機能性シートの表面に形成
されたプリズム形状の実施例を示した斜視図である。FIG. 7 is a perspective view showing an example of a prism shape formed on the surface of the light control functional sheet according to the present invention.

【図８】本発明による光制御機能性シートの表面に形成
されたプリズム形状の実施例を示した斜視図である。FIG. 8 is a perspective view showing an example of a prism shape formed on the surface of the light control functional sheet according to the present invention.

【符号の説明】[Explanation of symbols]

１ 表面にプリズム形状を有する冷却ロール ２ ニップロール ３ Ｔダイ ４ 光拡散フィルム ５ 光拡散層 ６ 基材 ７ マット層 ８ 光拡散シート兼レンズシート ９ プリズム 1 Cooling roll having a prism shape on the surface 2 Nip roll 3 T die 4 Light diffusing film 5 Light diffusing layer 6 Base material 7 Mat layer 8 Light diffusing sheet and lens sheet 9 Prism

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｇ０２Ｂ 5/04 Ｇ０２Ｂ 5/04 Ａ Ｇ０２Ｆ 1/1335 ５３０ Ｇ０２Ｆ 1/1335 ５３０ // Ｂ２９Ｌ 11:00 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification number Internal reference number FI Technical display location G02B 5/04 G02B 5/04 A G02F 1/1335 530 G02F 1/1335 530 // B29L 11:00

Claims (4)

【特許請求の範囲】[Claims] 【請求項１】 熱可塑性樹脂フィルムからなる基材に、
熱可塑性樹脂が押し出しラミネーション法により積層さ
れプリズムとしてなることを特徴とする液晶表示装置用
光制御機能性シート。1. A substrate comprising a thermoplastic resin film,
A light control functional sheet for a liquid crystal display device, characterized in that a thermoplastic resin is laminated by an extrusion lamination method to form a prism. 【請求項２】 熱可塑性樹脂フィルムからなる基材に、
光拡散層、該プリズムが積層されていることを特徴とす
る請求項１記載の液晶表示装置用光制御機能性シート。2. A substrate comprising a thermoplastic resin film,
The light control functional sheet for a liquid crystal display device according to claim 1, wherein a light diffusion layer and the prism are laminated. 【請求項３】 熱可塑性樹脂フィルムからなる基材の片
面に、光拡散層、該プリズムが積層され、基材のもう一
方の面にはマット層が形成されていることを特徴とする
請求項１記載の液晶表示装置用光制御機能性シート。3. A light diffusion layer and the prism are laminated on one surface of a base material made of a thermoplastic resin film, and a mat layer is formed on the other surface of the base material. 1. A light control functional sheet for a liquid crystal display device according to 1. 【請求項４】 熱可塑性樹脂フィルムからなる基材の表
面に、押し出しラミネート法により、熱可塑性樹脂を押
し出しコーティングすると同時に表面にプリズム形状を
有する冷却ロールに押圧することを特徴とする液晶表示
装置用光制御機能性シートの製造方法。4. A liquid crystal display device characterized in that the surface of a base material made of a thermoplastic resin film is extrusion-coated with a thermoplastic resin by an extrusion laminating method, and at the same time, it is pressed against a cooling roll having a prism shape on the surface. Manufacturing method of light control functional sheet.
JP14243395A 1995-05-18 1995-05-18 Manufacturing method of light control functional sheet for liquid crystal display device Expired - Lifetime JP3732252B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14243395A JP3732252B2 (en) 1995-05-18 1995-05-18 Manufacturing method of light control functional sheet for liquid crystal display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14243395A JP3732252B2 (en) 1995-05-18 1995-05-18 Manufacturing method of light control functional sheet for liquid crystal display device

Publications (2)

Publication Number Publication Date
JPH08313707A true JPH08313707A (en) 1996-11-29
JP3732252B2 JP3732252B2 (en) 2006-01-05

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ID=15315204

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Country Link
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