JPH08313708A - Lens sheet for liquid crystal display device and manufacturing method thereof - Google Patents

Lens sheet for liquid crystal display device and manufacturing method thereof

Info

Publication number
JPH08313708A
JPH08313708A JP7142434A JP14243495A JPH08313708A JP H08313708 A JPH08313708 A JP H08313708A JP 7142434 A JP7142434 A JP 7142434A JP 14243495 A JP14243495 A JP 14243495A JP H08313708 A JPH08313708 A JP H08313708A
Authority
JP
Japan
Prior art keywords
lens sheet
layer
thermoplastic resin
liquid crystal
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
JP7142434A
Other languages
Japanese (ja)
Other versions
JP3732253B2 (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 JP14243495A priority Critical patent/JP3732253B2/en
Publication of JPH08313708A publication Critical patent/JPH08313708A/en
Application granted granted Critical
Publication of JP3732253B2 publication Critical patent/JP3732253B2/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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
    • B29C48/914—Cooling drums
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/911—Cooling
    • B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
    • B29C48/915—Cooling of flat articles, e.g. using specially adapted supporting means with means for improving the adhesion to the supporting means
    • B29C48/9155—Pressure rollers
    • 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
    • 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 shape; Layered products comprising a layer 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 shape; Layered products comprising a layer 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 shape; Layered products comprising a layer 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
    • 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
    • G02B5/021—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
    • G02B5/0231—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 microprismatic or micropyramidal shape
    • 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
    • G02B5/0273—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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/305—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets
    • B29C48/307—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets specially adapted for bringing together components, e.g. melts within the die
    • 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

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Mechanical Engineering (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Ophthalmology & Optometry (AREA)
  • Manufacturing & Machinery (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Liquid Crystal (AREA)
  • Planar Illumination Modules (AREA)
  • Optical Elements Other Than Lenses (AREA)

Abstract

(57)【要約】 【目的】 本発明は液晶表示装置用バックライトシステ
ムに用いられる光拡散効果を併せ持つレンズシートおよ
びその製造方法を提供する。 【構成】 少なくとも２層の多層フィルムであって、前
記多層フィルムの一方の表面層にプリズム形状部が設け
られ、該表面層以外の少なくとも１層に光拡散剤が混練
されたことを特徴とする液晶表示装置用レンズシートで
ある。共押し出し法により積層した少なくとも２層の熱
可塑性樹脂層の一方の表面層にプリズム形状を有する冷
却ロールに押圧し、前記表面層と異なる熱可塑性樹脂層
に光拡散剤を混練することを特徴とする液晶表示装置用
レンズシートの製造方法である。 (57) [Abstract] [Object] The present invention provides a lens sheet having a light diffusion effect used in a backlight system for a liquid crystal display device, and a method for manufacturing the same. A multilayer film having at least two layers, wherein a prism-shaped portion is provided on one surface layer of the multilayer film, and a light diffusing agent is kneaded in at least one layer other than the surface layer. A lens sheet for a liquid crystal display device. One of the at least two thermoplastic resin layers laminated by the co-extrusion method is pressed against a cooling roll having a prism shape, and a thermoplastic resin layer different from the surface layer is kneaded with a light diffusing agent. A method of manufacturing a lens sheet for a liquid crystal display device.

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拡散効果を併せ持つレンズ
シートおよびその製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lens sheet having a light diffusing effect used in a backlight system for a liquid crystal display device and a method for manufacturing the same.

【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３つであ
る。すなわち、 少なくとも２層の多層フィルムであって、前記多層
フィルムの一方の表面層にプリズム形状部が設けられ、
該表面層以外の少なくとも１層に光拡散剤が混練された
ことを特徴とする液晶表示装置用レンズシート。 共押し出し法により積層した少なくとも２層の熱可
塑性樹脂層の一方の表面層にプリズム形状を有する冷却
ロールに押圧し、前記表面層と異なる熱可塑性樹脂層に
光拡散剤を混練することを特徴とする液晶表示装置用レ
ンズシートの製造方法。 熱可塑性樹脂フィルムからなる基材の表面に、共押
し出しラミネート法により、少なくとも２層の熱可塑性
樹脂層を共押し出しコーティングにより積層させ、前記
熱可塑性樹脂層の表面にプリズム形状を有する冷却ロー
ルに押圧し、前記熱可塑性樹脂層と異なる熱可塑性樹脂
層に光拡散剤が混練されていることを特徴とする液晶表
示装置用レンズシートの製造方法。である。Therefore, the present invention made to solve such problems is the following three. That is, a multilayer film having at least two layers, wherein a prism-shaped portion is provided on one surface layer of the multilayer film,
A lens sheet for a liquid crystal display device, wherein at least one layer other than the surface layer is kneaded with a light diffusing agent. One of the at least two thermoplastic resin layers laminated by the co-extrusion method is pressed against a cooling roll having a prism shape, and a thermoplastic resin layer different from the surface layer is kneaded with a light diffusing agent. A method for manufacturing a lens sheet for a liquid crystal display device. At least two thermoplastic resin layers are laminated by coextrusion coating on the surface of a base material made of a thermoplastic resin film by a coextrusion laminating method, and pressed on a cooling roll having a prism shape on the surface of the thermoplastic resin layer. A method for producing a lens sheet for a liquid crystal display device, wherein a thermoplastic resin layer different from the thermoplastic resin layer is kneaded with a light diffusing agent. Is.

【０００５】本発明のプリズム形状形成層用の押し出し
する樹脂としては、アクリル樹脂、ポリカーボネート、
ポリ塩化ビニル、ポリスチレン、ポリエチレン、ポリプ
ロピレン、ポリエステル、環状ポリオレフィン等の単独
もしくは混合体もしくは共重合体が特に有効である。こ
の他、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、ポリエチレンナフタレート・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、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も使用される。As the resin extruded for the prism shape forming layer of the present invention, acrylic resin, polycarbonate,
Homogeneous or a mixture or copolymer of polyvinyl chloride, polystyrene, polyethylene, polypropylene, polyester, cyclic polyolefin and the like is particularly effective. In addition, polyester resins such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate / isophthalate copolymers, polyolefin resins such as polymethylpentene, polyvinyl fluoride chloride, polyvinylidene fluoride, polytetrafluoroethylene, ethylene・ Polyfluoroethylene resin such as tetrafluoroethylene copolymer, polyamide resin such as nylon 6 nylon 66, vinyl chloride / vinyl acetate copolymer, ethylene / vinyl alcohol copolymer, vinyl resin such as polyvinyl alcohol , Cellulose triacetate, cellulosic resin such as cellophane, acrylic resin such as polymethylmethacrylate, polyethylmethacrylate, polybutylacrylate, polyarylate, polyimide, etc., alone or as a mixture. The copolymers are also used.

【０００６】本発明の光拡散層用の押し出しする樹脂と
しては、光拡散剤が混練されたアクリル樹脂、ポリカー
ボネート、ポリ塩化ビニル、ポリスチレン、ポリエチレ
ン、ポリプロピレン、ポリエステル、環状ポリオレフィ
ン等の単独もしくは混合体もしくは共重合体が特に有効
である。この他、光拡散剤が混練されたポリエチレンテ
レフタレート、ポリブチレンテレフタレート、ポリエチ
レンナフタレート・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、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
共重合体も使用される。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が
利用される。The resin to be extruded for the light diffusing layer of the present invention is an acrylic resin in which a light diffusing agent is kneaded, polycarbonate, polyvinyl chloride, polystyrene, polyethylene, polypropylene, polyester, cyclic polyolefin, etc., alone or in a mixture, or Copolymers are particularly effective. In addition, polyethylene terephthalate kneaded with a light diffusing agent, polybutylene terephthalate, polyester resin such as polyethylene naphthalate / isophthalate copolymer, polyolefin resin such as polymethylpentene, polyvinyl fluoride chloride, polyvinylidene fluoride, Polytetrafluoroethylene, polyfluoroethylene resin such as ethylene / tetrafluoroethylene copolymer, polyamide resin such as nylon 6 nylon 66, vinyl chloride / vinyl acetate copolymer, ethylene / vinyl alcohol copolymer, Vinyl resins such as polyvinyl alcohol,
Cellulose resins such as cellulose triacetate and cellophane, acrylic resins such as polymethylmethacrylate, polyethylmethacrylate and polybutylacrylate, homo- or mixtures of polyarylate and polyimide, or copolymers are also 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. A single substance or a mixture having an average particle diameter of 1 to 40 μm is used.

【０００７】本発明の熱可塑性樹脂フィルムからなる基
材（共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〜
２００μｍが好ましく、さらに好ましくは１０〜１２５
μｍ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、ポリエチレンナフタレート・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、ポリイミド等があげられる。The base material (base material for coextrusion laminating) comprising 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 5.
200 μm is preferable, and more preferably 10 to 125.
It is possible to use a micrometer type. Specific examples of the material of this base material include polyester resins such as polyethylene terephthalate, polybutylene terephthalate, polyethylene naphthalate / isophthalate copolymer, polyolefin resins such as polyethylene, polypropylene and polymethylpentene, and polyfluorinated chloride. Vinyl, polyvinylidene fluoride, polytetrafluoroethylene, polyfluoroethylene resin such as ethylene / tetrafluoroethylene copolymer, polyamide resin such as nylon 6 nylon 66, polyvinyl chloride, vinyl chloride / vinyl acetate copolymer Polymers, ethylene-vinyl alcohol copolymers, vinyl resins such as polyvinyl alcohol, cellulose triacetate, cellulosic resins such as cellophane, polymethyl methacrylate, polyethyl methacrylate, polybutyl acrylate, etc. Acrylic resins, polystyrene, polycarbonate, polyarylate, polyimide and the like.

【０００８】本発明の基材には前記した光拡散剤を練り
混んでおくと、光拡散層も兼ねることができる。また、
本発明の基材にはマット層を形成してもよい。形成方法
としては、 基材にマット剤をバインダー樹脂に分散したマット層
用コーティング剤を塗工形成する方法 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 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。When the above-mentioned light diffusing agent is kneaded and mixed in the base material of the present invention, it can also serve as a light diffusing layer. Also,
A mat layer may be formed on the substrate of the present invention. As a forming method, a method of coating and forming a mat layer coating agent in which a matting agent is dispersed in a binder resin on a substrate, and a method of laminating a resin in which a matting agent is kneaded onto a substrate by extrusion lamination are used. 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.

【０００９】上記の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樹
脂等の架橋剤を配合しても良い。As the binder resin for the coating agent for the matte layer, polyester resins such as polyurethane, polyethylene terephthalate, polybutylene terephthalate, polyethylene terephthalate / isophthalate copolymer, etc., and polyolefin resins such as polyethylene, polypropylene, polymethylpentene etc. Resin, polyvinyl fluoride, polyvinylidene fluoride, polytetrafluoroethylene, polyfluoroethylene resin such as ethylene / tetrafluoroethylene copolymer, polyamide resin such as nylon 6 nylon 66, polyvinyl chloride, vinyl chloride・
Vinyl acetate copolymers, polyvinyl butyral, ethylene vinyl alcohol copolymers, vinyl resins such as polyvinyl alcohol, cellulose triacetate, cellulosic resins such as cellophane, polymethyl methacrylate, polyethyl methacrylate, polybutyl acrylate. Acrylic resins such as the above, acrylonitrile-butadiene copolymer, polystyrene, polycarbonate, polyarylate, polyimide or the like alone or in a mixture, or a crosslinking agent such as an isocyanate resin may be added.

【００１０】次に、本発明のレンズシートの一方の表面
の図５〜図９に示したような形状のプリズムを形成する
には、『共押し出し法により積層した少なくとも２層の
熱可塑性樹脂層の一方の表面層に図５〜図９に示したプ
リズム形状を有する冷却ロールに押圧する方法』と『熱
可塑性樹脂フィルムからなる基材の表面に、共押し出し
ラミネート法により、少なくとも２層の熱可塑性樹脂層
を共押し出しコーティングにより積層させ、前記熱可塑
性樹脂層の表面に図５〜図６に示したプリズム形状を有
する冷却ロールに押圧する方法。』とがある。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５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 order to form a prism having a shape as shown in FIGS. 5 to 9 on one surface of the lens sheet of the present invention, "at least two thermoplastic resin layers laminated by a coextrusion method are formed. A method of pressing a cooling roll having a prism shape shown in FIGS. 5 to 9 on one surface layer of the above ”and“ a heat treatment of at least two layers on a surface of a substrate made of a thermoplastic resin film by a coextrusion laminating method. A method in which a thermoplastic resin layer is laminated by coextrusion coating, and the surface of the thermoplastic resin layer is pressed against a cooling roll having a prism shape shown in FIGS. ]. 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. 5 are arranged in parallel is preferable. As a method of manufacturing a cooling roll having the prism shape, directly on the surface of the cooling roll,
The prism shape may be formed by a method such as engraving or corrosion, or a stamper made of metal or resin having the prism shape may be formed on the surface of the cooling roll.

【００１１】[0011]

【作用】本発明によれば、溶融押し出し可能な樹脂であ
ればいずれの樹脂もレンズシート用材料として使用でき
るため、樹脂特有の屈折率等の光学特性や熱的特性、物
理的特性等の選択範囲が極めて広くなる。さらに本発明
のレンズシートは、光拡散効果を併せ持つため、バック
ライトの組み立て工程で別途光拡散フィルムを入れる必
要がなく、組み立て工程を簡略化することができる。さ
らには従来のレンズシートのように熱可塑性シートを製
造したのちにさらにエンボス工程が必要になる等の製造
コストアップの要因がなく、一体化する光拡散層も同時
に形成できるため、別途光拡散フィルム成形工程やコー
ティング工程等の製造工程が必要ない。従って、本発明
のレンズシートは、極めて低コストで大量生産できる。
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。マット層の役目は、導光板とのスティッキング防止
のためである。According to the present invention, since any resin that can be melt extruded can be used as the material for the lens sheet, selection of optical characteristics such as refractive index peculiar to the resin, thermal characteristics, physical characteristics, etc. The range becomes extremely wide. Furthermore, since the lens sheet of the present invention also has a light diffusion effect, it is not necessary to separately insert a light diffusion film in the backlight assembly process, and the assembly process can be simplified. Furthermore, since there is no factor of increasing the manufacturing cost such as the need for an embossing step after manufacturing a thermoplastic sheet like a conventional lens sheet, and an integrated light diffusion layer can be formed at the same time, a separate light diffusion film No manufacturing process such as molding process or coating process is required. Therefore, the lens sheet of the present invention can be mass-produced at an extremely low cost.
The role of the light diffusion layer is to uniformly diffuse the light emitted from the light guide plate,
This is to make the dot pattern on the back surface of the light guide plate invisible. The role of the mat layer is to prevent sticking with the light guide plate.

【００１２】[0012]

【実施例】本発明の実施例を図面により説明する。図１
は本発明によるレンズシートの製造方法の一実施例を示
す断面図である。図２は本発明によるレンズシートの製
造方法の一実施例を示す断面図である。図３は本発明に
よるレンズシートの一実施例を示した断面図である。図
４は本発明によるレンズシートの一実施例を示した断面
図である。図５〜図９は本発明によるレンズシートの表
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 an example of a method for manufacturing a lens sheet according to the present invention. FIG. 2 is a sectional view showing an embodiment of the method for manufacturing a lens sheet according to the present invention. FIG. 3 is a sectional view showing an embodiment of the lens sheet according to the present invention. FIG. 4 is a sectional view showing an embodiment of the lens sheet according to the present invention. 5 to 9 are perspective views showing examples of prism shapes formed on the surface of the lens sheet according to the present invention.

【００１３】実施例１ 図１に示した共押し出し装置を用いて、プリズム形状形
成層として環状ポリオレフィン系樹脂（三井石油化学工
業製アペル）、光拡散層として光拡散剤になるポリメチ
ルメタクリレートビーズ（積水化成品品工業製平均粒径
２μ）を２０重量％分散したアペルをシリンダー温度２
５０°Ｃ、ダイス温度２２０°Ｃの加工条件で、表面に
図５のプリズム形状を有する冷却ロール上に押し出し、
ニップロールで押し圧し冷却することにより、表面にプ
リズム形状が転写されたプリズム形状形成層８０μ、光
拡散層３０μの本発明のレンズシートを得た。実施例２ 厚さ２５μｍのポリエステルフィルム〔帝人（株）製
ＳＰ8 〕の非処理面に、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）により塗布した後
に乾燥し、厚さ５μｍのマット層を形成して、共押し出
しラミネート用基材４を得た。 マット層用コーティング剤の組成（ザ・インクテック株式会社製） 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 次いで、図２に示した共押し出しラミネート装置を用い
て、プリズム形状を形成する層としてアクリル（三菱レ
ーヨン製アクリペット）、光拡散層として光拡散剤にな
るシリカ中空ビーズ（旭硝子製セルスター平均粒径４０
μ）を５重量％分散したアクリル樹脂をシリンダー温度
２５０°Ｃ、ダイス温度２３０°Ｃの加工条件で、裏面
にマット層を形成した共押し出しラミネート用基材の表
面に共押し出しラミネートすると同時に表面に図９のプ
リズム形状を有する冷却ロールにニップロールで押し圧
し冷却することにより、表面にプリズム形状が転写され
たプリズム形状形成層６０μ、光拡散層８０μ、共押し
出しラミネート用基材２５μ、裏面マット層５μの本発
明のレンズシートを得た。 Example 1 Using the co-extrusion device shown in FIG. 1, a cyclic polyolefin resin (Apel made by Mitsui Petrochemical Industry Co., Ltd.) as a prism shape forming layer and polymethylmethacrylate beads (as a light diffusing agent as a light diffusing layer ( Sekisui Plastics Industrial Co., Ltd. average particle size 2μ) dispersed in 20% by weight of the apel cylinder temperature 2
Under processing conditions of 50 ° C and a die temperature of 220 ° C, extruded on a cooling roll having a prism shape of FIG. 5 on the surface,
By pressing and cooling with a nip roll, a lens sheet of the present invention having a prism shape forming layer having a prism shape transferred to the surface of 80 μ and a light diffusion layer of 30 μ was obtained. Example 2 Polyester film having a thickness of 25 μm (manufactured by Teijin Ltd.)
Before applying the matting layer coating agent having the following composition to the non-treated surface of SP 8 ], the main agent and the curing agent are 100/3 (weight ratio).
And mixed by a gravure reverse coating method (gravure plate depth 20 μ, 230 lines / inch) and then dried to form a mat layer having a thickness of 5 μm to obtain a co-extrusion laminating substrate 4. . Composition of coating agent for mat layer (manufactured by The Inktech Co., Ltd.) 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 solvent ethyl acetate 25 parts by weight Next, using the co-extrusion laminating apparatus shown in FIG. 2, acrylic (Acrypet made by Mitsubishi Rayon) as a layer for forming a prism shape and a light diffusion layer. Silica hollow beads used as light diffusing agent (Asahi Glass cell star average particle size 40
5% by weight of acrylic resin is co-extruded and laminated on the surface of the co-extrusion laminating substrate having a mat layer formed on the back side under the processing conditions of a cylinder temperature of 250 ° C. and a die temperature of 230 ° C. By pressing and cooling the cooling roll having the prism shape shown in FIG. 9 with a nip roll, the prism shape forming layer having the prism shape transferred to the surface 60 μ, the light diffusion layer 80 μ, the coextrusion laminating substrate 25 μ, the back surface mat layer 5 μ The lens sheet of the present invention was obtained.

【００１４】[0014]

【発明の効果】本発明のレンズシートは押し出しラミネ
ート法もしくは共押し出しコーティング法により、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、プリズム形状が形成される層とは異なる熱可塑性樹
脂層に光拡散剤を添加することにより光拡散層を形成
し、光拡散フィルムを一体化したものであるので、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
る上に、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 lens sheet of the present invention transfers the prism shape formed on the surface of the cooling roll to the surface of the melt-extruded thermoplastic resin sheet by the extrusion laminating method or the coextrusion coating method. A light diffusion layer is formed by adding a light diffusion agent to a thermoplastic resin layer that is different from the layer in which the shape is formed, and since the light diffusion film is integrated, it is less costly than before. The present invention provides a lens sheet for a liquid crystal display device suitable for mass production and a method for manufacturing the same, and can simplify a process for assembling a backlight for a liquid crystal display device.

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

【図１】本発明によるレンズシートの製造方法の一実施
例を示した断面図である。FIG. 1 is a cross-sectional view showing an example of a method for manufacturing a lens sheet according to the present invention.

【図２】本発明によるレンズシートの製造方法の一実施
例を示した断面図である。FIG. 2 is a cross-sectional view showing an example of a method for manufacturing a lens sheet according to the present invention.

【図３】本発明による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 lens sheet according to the present invention.

【図４】本発明によるレンズシートの一実施例を示した
断面図である。FIG. 4 is a sectional view showing an embodiment of a lens sheet according to the present invention.

【図５】本発明によるレンズ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FIG. 5 is a perspective view showing an embodiment of a prism shape formed on the surface of a lens sheet according to the present invention.

【図６】本発明によるレンズ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であ
る。FIG. 6 is a perspective view showing an example of a semicylindrical prism shape formed on the surface of the lens sheet according to the present invention.

【図７】本発明によるレンズ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 a lens sheet according to the present invention.

【図８】本発明によるレンズ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 a lens sheet according to the present invention.

【図９】本発明によるレンズ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. 9 is a perspective view showing an example of a prism shape formed on the surface of a lens 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 共押し出しラミネート用基材 ５ レンズシート ６ 光拡散層 ７ プリズム形状形成層 1 Cooling roll having a prism shape on the surface 2 Nip roll 3 T die 4 Coextrusion laminating substrate 5 Lens sheet 6 Light diffusion layer 7 Prism shape forming layer

───────────────────────────────────────────────────── 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 1/04 Ｇ０２Ｂ 1/04 5/04 5/04 Ａ Ｇ０２Ｆ 1/1335 ５３０ Ｇ０２Ｆ 1/1335 ５３０ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI Technical display location G02B 1/04 G02B 1/04 5/04 5/04 A G02F 1/1335 530 G02F 1/1335 530

Claims (3)

【特許請求の範囲】[Claims] 【請求項１】 少なくとも２層の多層フィルムであっ
て、前記多層フィルムの一方の表面層にプリズム形状部
が設けられ、該表面層以外の少なくとも１層に光拡散剤
が混練されたことを特徴とする液晶表示装置用レンズシ
ート。1. A multilayer film having at least two layers, wherein one surface layer of the multilayer film is provided with a prism-shaped portion, and at least one layer other than the surface layer is kneaded with a light diffusing agent. A lens sheet for liquid crystal display devices. 【請求項２】 共押し出し法により積層した少なくとも
２層の熱可塑性樹脂層の一方の表面層にプリズム形状を
有する冷却ロールに押圧し、前記表面層と異なる熱可塑
性樹脂層に光拡散剤を混練することを特徴とする液晶表
示装置用レンズシートの製造方法。2. A light diffusing agent is kneaded into a thermoplastic resin layer different from the surface layer by pressing a cooling roll having a prism shape on one surface layer of at least two thermoplastic resin layers laminated by a coextrusion method. A method of manufacturing a lens sheet for a liquid crystal display device, comprising: 【請求項３】 熱可塑性樹脂フィルムからなる基材の表
面に、共押し出しラミネート法により、少なくとも２層
の熱可塑性樹脂層を共押し出しコーティングにより積層
させ、前記熱可塑性樹脂層の表面にプリズム形状を有す
る冷却ロールに押圧し、前記熱可塑性樹脂層と異なる熱
可塑性樹脂層に光拡散剤が混練されていることを特徴と
する液晶表示装置用レンズシートの製造方法。3. At least two thermoplastic resin layers are laminated by coextrusion coating on the surface of a base material made of a thermoplastic resin film by a coextrusion laminating method, and a prism shape is formed on the surface of the thermoplastic resin layer. A method for producing a lens sheet for a liquid crystal display device, which comprises pressing a cooling roll that is provided and kneading a light diffusing agent in a thermoplastic resin layer different from the thermoplastic resin layer.
JP14243495A 1995-05-18 1995-05-18 Manufacturing method of lens sheet for liquid crystal display device Expired - Lifetime JP3732253B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP14243495A JP3732253B2 (en) 1995-05-18 1995-05-18 Manufacturing method of lens sheet for liquid crystal display device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP14243495A JP3732253B2 (en) 1995-05-18 1995-05-18 Manufacturing method of lens sheet for liquid crystal display device

Publications (2)

Publication Number Publication Date
JPH08313708A true JPH08313708A (en) 1996-11-29
JP3732253B2 JP3732253B2 (en) 2006-01-05

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Country Link
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JP2006220995A (en) * 2005-02-10 2006-08-24 Sun Tec Kk Optical sheet
WO2006101100A1 (en) * 2005-03-23 2006-09-28 Fujifilm Corporation Method of producing resin sheet
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JP2010519568A (en) * 2007-02-16 2010-06-03 コーロン インダストリーズ インク Diffusion plate
KR100919739B1 (en) * 2007-10-15 2009-09-29 엔타이어 테크놀로지 캄파니 리미티드 Diffusion film light diffusion structure molding process and installation thereof
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