JP5271588B2 - Optical filter for display screen - Google Patents
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- JP5271588B2 JP5271588B2 JP2008105068A JP2008105068A JP5271588B2 JP 5271588 B2 JP5271588 B2 JP 5271588B2 JP 2008105068 A JP2008105068 A JP 2008105068A JP 2008105068 A JP2008105068 A JP 2008105068A JP 5271588 B2 JP5271588 B2 JP 5271588B2
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Abstract
Description
本発明は、携帯電話等の液晶ディスプレイの表示画面前面に取り付けることで、レンズフィルムのレンズ効果により可視範囲をコントロールし、画面の略正面からは画像が見えても、斜め横からは画像が見えないようにする、いわゆる覗き見防止用の表示画面用光学フィルターに関するものである。 The present invention is attached to the front of the display screen of a liquid crystal display such as a mobile phone, so that the visible range is controlled by the lens effect of the lens film, and even if the image can be seen from the front of the screen, the image can be seen from the oblique side. The present invention relates to an optical filter for a display screen for preventing so-called peeping.
液晶ディスプレイ等の電子表示装置は、パソコン、コピー機、ファクシミリ等のＯＡ機器の分野に限られず、キャッシュディスペンサー、ＡＴＭ、ゲーム機、テレビ、時計、携帯電話、工場内の制御装置等の広い分野で使用されている。特にキャッシュディスペンサー、ＡＴＭ、ノートパソコン、モバイル、携帯電話等では、プライバシー保護のため、電子表示装置に、横からの覗き見を防止するための視界（視野角）制御機能が要求されている。 Electronic display devices such as liquid crystal displays are not limited to the field of OA equipment such as personal computers, copiers, and facsimiles, but in a wide range of fields such as cash dispensers, ATMs, game machines, televisions, watches, mobile phones, and control devices in factories. It is used. In particular, cash dispensers, ATMs, laptop computers, mobile phones, mobile phones, and the like require a visual field (viewing angle) control function for preventing peeping from the side in an electronic display device in order to protect privacy.
上記の視野角制御機能を付与する手段として、本発明者らは、高分子材料からなるフィルムの片面に微細な凹凸を形成してなるレンズフィルムを構成材料とし、ディスプレイの表示画面前面に取付けて可視範囲をコントロールするようにした表示画面用光学フィルターを幾つか提案してきた（特許文献１〜３等）。 As a means for providing the viewing angle control function, the present inventors use a lens film formed with fine irregularities on one side of a film made of a polymer material as a constituent material, and attach it to the front of the display screen of the display. Several optical filters for display screens that control the visible range have been proposed (Patent Documents 1 to 3, etc.).
しかし、これらの従来技術では、携帯電話等を使用する際に、周囲が明るい場合には視野角制御効果が充分に機能するが、周囲が暗いと視認性が低下して視野角制御効果が不充分となることがあった。
そこで、本発明では、液晶表示装置を使用する際の周囲の明暗に関係なく、正面から画面を眺めたときの画像視認性に優れ、かつ、横からの覗き見を防止することのできる表示画面用光学フィルターを提供することを課題とした。 Therefore, in the present invention, regardless of the surrounding brightness when using the liquid crystal display device, the display screen has excellent image visibility when the screen is viewed from the front and can prevent peeping from the side. It was an object to provide an optical filter for use.
本発明は、ディスプレイの表示画面前面に取付けて可視範囲をコントロールするための表示画面用光学フィルターであり、底面と略平行な面状部を頭頂に有する略同一高さのレンズ部が多数形成されたレンズフィルムを、レンズ部の上記面状部を表示画面側に向けて、レンズ部間の谷部の空間を保持したまま取り付けて使用するものであって、上記レンズフィルムのレンズ部の表面に、アクリル系感圧粘着層、支持体、自己粘着層、セパレートフィルムをこの順に積層したものであるところに要旨を有する。 The present invention is an optical filter for a display screen that is attached to the front of a display screen of a display to control the visible range, and has a large number of lens portions having substantially the same height and having a surface portion substantially parallel to the bottom surface. the lens film was toward the planar portion of the lens portion on the display screen side, it der those used attached while maintaining the space of the valley between the lens unit, the surface of the lens portion of the lens film to have, acrylic pressure-sensitive adhesive layer, the support, the self-adhesive layer, the gist in der Rutokoro a laminate of a separate film in this order.
上記レンズフィルムのレンズ部が、四角錐台であるか、突条の長手方向に直交する方向の縦断面が、台形、矩形または凸字状の突条部であり、四角錐台または台形の斜辺の底辺に対する傾斜角が６０〜９０度未満であることが好ましい。 The lens portion of the lens film is a truncated pyramid, or the longitudinal section in a direction perpendicular to the longitudinal direction of the ridge is a trapezoidal, rectangular or convex ridge, and the hypotenuse of the truncated pyramid or trapezoid It is preferable that the inclination angle with respect to the bottom side is less than 60 to 90 degrees.
上記レンズフィルムが透明基材フィルムの片面にレンズ部を形成したものであることが好ましく、レンズ部の反対側に傷付き防止層を備えていてもよい。 It is preferable that the lens film has a lens part formed on one side of the transparent base film, and a scratch preventing layer may be provided on the opposite side of the lens part.
上記レンズフィルムが、レンズ部の表面に、第１粘着層、支持体、第２粘着層、セパレートフィルムをこの順に積層したものである態様は、本発明の好ましい実施態様である。このとき、第２粘着層で表示画面に取り付けられることが好ましく、第２粘着層が自己粘着層であると一層好ましい。 A mode in which the lens film is formed by laminating a first pressure-sensitive adhesive layer, a support, a second pressure-sensitive adhesive layer, and a separate film in this order on the surface of the lens portion is a preferred embodiment of the present invention. At this time, the second adhesive layer is preferably attached to the display screen, and the second adhesive layer is more preferably a self-adhesive layer.
本発明の表示画面用光学フィルターは、液晶表示装置を使用する際の周囲の明暗に関係なく、正面から画面を眺めたときの画像視認性に優れており、しかも、横からの覗き見を効果的に防止することができるようになった。自己粘着層を有する両面粘着シートと視野角制御用レンズフィルムとが一体化された最も好ましい実施態様のフィルターでは、自己粘着層を表示画面に当てて手で押さえるだけで気泡を入れることなく均一に取付けることができ、作業性が良好である。また、貼着ミスがあった場合、ゲーム機のように画面の縦と横が切り替わる場合、画面形成部が９０度回転可能に構成されている携帯電話の場合等、必要に応じて剥離し、再度貼り付けることができ、貼着ミスがあっても貼り直しが可能である。さらに剥離跡に自己粘着層が残ることがないため、表示画面を汚すこともない。 The optical filter for display screen of the present invention has excellent image visibility when looking at the screen from the front, regardless of the brightness of surroundings when using a liquid crystal display device, and is effective for peeping from the side. Can now be prevented. In the filter of the most preferred embodiment in which the double-sided pressure-sensitive adhesive sheet having the self-adhesive layer and the viewing angle control lens film are integrated, the self-adhesive layer is uniformly applied without touching the display screen by simply pressing it with the hand. It can be attached and the workability is good. In addition, when there is a sticking mistake, when the screen is switched between vertical and horizontal like a game machine, the screen forming unit is peeled off as necessary, such as a mobile phone configured to be rotated 90 degrees, It can be pasted again and can be pasted even if there is a sticking mistake. Further, since the self-adhesive layer does not remain on the peeling mark, the display screen is not soiled.
従って、本発明の表示画面用光学フィルターは、パソコン、コピー機、ファクシミリ等のＯＡ機器、キャッシュディスペンサー、ＡＴＭ、ゲーム機、テレビ、時計、携帯電話等、広い分野で使用されている液晶表示装置の視野角制御用の光学フィルターとして有用である。 Accordingly, the optical filter for display screen of the present invention is a liquid crystal display device used in a wide range of fields such as OA equipment such as personal computers, copy machines, facsimiles, cash dispensers, ATMs, game machines, TVs, watches, mobile phones and the like. It is useful as an optical filter for viewing angle control.
本発明の表示画面用光学フィルターでは、レンズ部の凸部を液晶ディスプレイの表示画面側に向けて、かつレンズ部の谷の空間を保持したまま取り付けるところに特徴を有している。従って、レンズ部は、レンズ部の底面と略平行な面状部を頭頂に有する形状でなければならない。よく知られているプリズムシートのような断面が三角形のような先鋭的な形状では、表示画面を正面から眺めた時に画像の輪郭がぼやけ、視認性が低下するので好ましくない。また、表示画面に固着させることが難しい場合があるからである。 The optical filter for display screen according to the present invention is characterized in that the lens portion is mounted with the convex portion of the lens portion facing the display screen side of the liquid crystal display and the valley space of the lens portion is maintained. Therefore, the lens portion must have a shape having a planar portion at the top that is substantially parallel to the bottom surface of the lens portion. A sharp shape such as a well-known prism sheet having a triangular cross section is not preferable because the outline of the image is blurred and the visibility is lowered when the display screen is viewed from the front. Further, it is sometimes difficult to fix the display screen.
レンズ部の形状は、底面と略平行な面状部を頭頂に有するものであれば特に限定されない。なお、頭頂部の面状部は、若干上方に湾曲していてもよい。固着の際に湾曲部が加圧されて平坦な面状部になり得るからである。レンズフィルムが、１個１個離間したレンズ部を有する場合、レンズ部は、円柱、楕円柱、三角柱、四角柱、六角柱、円錐台、楕円錐台、三角錐台、四角錐台等が好ましい。また、これらを組み合わせたものや重ね合わせたもの等のように、側辺に１個または複数の段差があるものでも構わない。１個１個のレンズ部間は完全に離間している必要はなく、隣接するレンズ部が底辺を共通する形状のレンズ部であってもよい。このように１個１個のレンズ部が多数形成されているレンズフィルムは、ゲーム機のように画面の縦と横が切り替わる場合、画面形成部が９０度回転可能に構成されている携帯電話の場合等において、いずれの方向でも視野角制御機能が発現することが期待できる。 The shape of the lens part is not particularly limited as long as it has a planar part at the top of the head that is substantially parallel to the bottom surface. Note that the planar portion of the top of the head may be slightly curved upward. This is because the curved portion can be pressurized during fixing to form a flat surface portion. When the lens film has lens portions that are separated one by one, the lens portion is preferably a cylinder, an elliptical column, a triangular column, a quadrangular column, a hexagonal column, a truncated cone, an elliptical truncated cone, a triangular truncated cone, a quadrangular truncated cone, or the like. . In addition, a combination of these or a combination thereof, such as one having a plurality of steps on the side, may be used. It is not necessary that the individual lens portions are completely separated from each other, and adjacent lens portions may be lens portions having a common base. In this way, a lens film in which a large number of lens portions are formed one by one is used for a mobile phone in which the screen forming portion is configured to be rotated 90 degrees when the screen is switched between vertical and horizontal like a game machine. In some cases, the viewing angle control function can be expected to appear in any direction.
レンズフィルムとしては、一方向に連続した突条部（レンズ部）が離間し、または離間せずに並列したものも利用可能である。この場合は、突条部が上下方向に延びるようにフィルターを表示画面に貼り付ける必要があるが、後述する自己粘着層で表示画面に貼り付けるようにすれば、貼り替えが容易のため、好ましい実施態様である。突条部の長手方向に直交する方向の縦断面（以下単に縦断面という）は、台形、矩形、凸字状等が好ましい。 As the lens film, a film in which ridges (lens portions) continuous in one direction are separated or parallel without being separated can be used. In this case, it is necessary to paste the filter on the display screen so that the protrusions extend in the vertical direction, but it is preferable to paste the filter on the display screen with a self-adhesive layer described later, because it is easy to replace the filter. This is an embodiment. The longitudinal section (hereinafter simply referred to as the longitudinal section) in the direction orthogonal to the longitudinal direction of the ridge is preferably a trapezoid, a rectangle, a convex shape, or the like.
１個１個のレンズ部の場合、直線突条のレンズ部の場合のいずれにおいても、上記した形状のレンズ部であれは、頭頂部側を表示画面側にして表示画面に取り付けたときに、表示画面を正面から眺めても画像の輪郭がぼやけたり、視認性が低下することがなく、横からの覗き見を防止する効果（視野角制御機能）が発現する。また、周囲が暗い場所であっても、良好な視野角制御機能を発揮する。レンズ部の底辺と側辺のなす角度（図３におけるθ）が６０〜９０度であれば、上記作用効果が一層増大するため好ましい。これらのレンズ部は、例えば、両面粘着シートによる固定を確実にするため、その高さは略同一とする。高さが略同一とは、レンズ部の平均高さに対し、すべてのレンズ部の高さが±５μｍ以内に収まっていることを意味する。 In the case of each lens part, in the case of the lens part of a linear protrusion, in the case of the lens part of the shape described above, Even if the display screen is viewed from the front, the outline of the image is not blurred or the visibility is not lowered, and the effect of preventing peeping from the side (viewing angle control function) appears. In addition, a good viewing angle control function is exhibited even in a dark place. If the angle (θ in FIG. 3) formed by the bottom side and the side side of the lens portion is 60 to 90 degrees, the above-described effects are further increased, which is preferable. These lens portions have substantially the same height, for example, in order to ensure fixation by a double-sided pressure-sensitive adhesive sheet. That the heights are substantially the same means that the heights of all the lens portions are within ± 5 μm with respect to the average height of the lens portions.
レンズフィルムの視野角制御効果と表示画面（後述する両面粘着シートを介する場合もある）への固着力を考慮すると、レンズ部は縦断面が台形であることが好ましく、突条部でない１個１個のレンズ部の場合は四角錐台が好適であり、一方向に連続した突条部の場合は、縦断面台形の突条部が好ましい。なお、四角錐台とは、四角錐の頭頂部を底面に平行な面で切断した形のものである。 Considering the effect of controlling the viewing angle of the lens film and the fixing force to the display screen (which may be via a double-sided pressure-sensitive adhesive sheet to be described later), the lens section preferably has a trapezoidal longitudinal section, and is not a protrusion 1 In the case of a single lens part, a quadrangular frustum is suitable, and in the case of a ridge part continuous in one direction, a ridge part having a trapezoidal longitudinal section is preferred. The quadrangular pyramid is a shape obtained by cutting the top of the quadrangular pyramid with a plane parallel to the bottom surface.
図１には、１個１個離間し、規則的に整列した四角錐台のレンズ部２が形成されたレンズフィルム１の例を、図２には、縦断面が台形状で、直線的に延びる突条（直線突条）のレンズ部４が、離間して並設されたレンズフィルム３の例を示した。いずれの場合においても、図３に示したように、縦断面は等脚台形である。断面形状が矩形の場合も含めて好適な大きさを示すと、頂辺Ｌ1は１０〜７０μｍ（より好ましくは１５〜６５μｍ）、底辺Ｌ2は１０〜７０μｍ（より好ましくは１５〜６５μｍ）、隣り合うレンズ部の間隔Ｌ3は５〜７０μｍ（より好ましくは８〜６０μｍ）、高さＨは１０〜１００μｍ（より好ましくは１５〜８０μｍ）が好ましい。底辺に対する斜辺の傾斜角θは６０〜９０度が好ましい。なお、頂辺と底辺が等しく、θが９０度のときは、矩形となる。この範囲であれば、レンズ面の接着面積を確保でき、レンズによる視野角制御効果も良好である。 FIG. 1 shows an example of a lens film 1 formed with regularly spaced quadrangular pyramid-shaped lens portions 2 one by one. In FIG. 2, the longitudinal section has a trapezoidal shape and linearly. The example of the lens film 3 in which the lens portions 4 of the extending ridges (straight ridges) are separated and arranged side by side is shown. In either case, as shown in FIG. 3, the longitudinal section is an isosceles trapezoid. When the cross-sectional shape shows a suitable size including a rectangular shape, the top side L 1 is 10 to 70 μm (more preferably 15 to 65 μm), the base side L 2 is 10 to 70 μm (more preferably 15 to 65 μm), The distance L 3 between adjacent lens portions is preferably 5 to 70 μm (more preferably 8 to 60 μm), and the height H is preferably 10 to 100 μm (more preferably 15 to 80 μm). The inclination angle θ of the hypotenuse with respect to the base is preferably 60 to 90 degrees. When the top and bottom are equal and θ is 90 degrees, the rectangle is rectangular. If it is this range, the adhesion area of a lens surface can be ensured and the viewing angle control effect by a lens is also favorable.
レンズフィルムの製造方法は特に限定されないが、透明な樹脂フィルムまたはその上に積層したレンズ形成用樹脂層に、レンズ構造のメス型の金型または彫刻ロールで熱プレスを行って賦形する方法、レンズ構造を有する離型性シートの表面模様を樹脂フィルムに転写する方法、レンズを別に製造し、透明な樹脂フィルムに接着剤等で接着して製造する方法、平坦なフィルムを、レーザー等の高エネルギー活性線で直接彫刻する方法等が挙げられる。 The method for producing the lens film is not particularly limited, and a method for forming a transparent resin film or a lens-forming resin layer laminated thereon by hot pressing with a female mold or engraving roll having a lens structure, A method of transferring the surface pattern of a releasable sheet having a lens structure to a resin film, a method of manufacturing a lens separately and adhering it to a transparent resin film with an adhesive, etc. For example, a method of engraving directly with an energy active ray.
樹脂フィルムとしては、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、ポリエチレンナフタレート等のポリエステルおよびその変成体；ポリカーボネート；ポリ（メタ）アクリル酸メチル等のアクリル樹脂；ポリスチレン、ポリメチルペンテン、環状ポリオレフィン重合体およびその変成体；トリアセチルセルロース；ポリ塩化ビニル、ポリ塩化ビニリデン等が挙げられる。 Examples of the resin film include polyesters such as polyethylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate and modified products thereof; polycarbonates; acrylic resins such as methyl poly (meth) acrylate; polystyrene, polymethylpentene, cyclic polyolefin polymers, and modified products thereof. Body; triacetyl cellulose; polyvinyl chloride, polyvinylidene chloride and the like.
また、上記フィルムを基材フィルムとして、この基材フィルム表面に、メラミン系、ウレタン系、アクリル系、シリコーン系、オキセタン系等の硬化性樹脂層を積層し、未硬化または半硬化状態で、熱プレスや金型等でレンズの賦形を行い、その後硬化を終了させる方法もレンズフィルムの好適な製造方法である。硬化方法は特に限定されないが、硬化度のコントロールが容易な点で紫外線や電子線等の活性線で硬化する方法が好ましい。 In addition, using the above film as a base film, a melamine-based, urethane-based, acrylic-based, silicone-based, oxetane-based or other curable resin layer is laminated on the surface of the base film, and heat is applied in an uncured or semi-cured state. A method of forming a lens with a press, a mold, or the like and then terminating the curing is also a preferable method for manufacturing a lens film. The curing method is not particularly limited, but a method of curing with active rays such as ultraviolet rays and electron beams is preferable in terms of easy control of the degree of curing.
レンズフィルムのトータル厚みとしては、レンズ部も含めて、５０〜５００μｍが好ましい。 The total thickness of the lens film is preferably 50 to 500 μm including the lens portion.
レンズフィルムのレンズ部の反対面に傷付き防止層を設けてもよい。反対面が最表層となるので、この面に傷付き防止層を設けることで、レンズフィルムに傷が付くのを防止できる。傷付き防止層としては、前記した硬化性樹脂を硬化した層が好ましく、その他に、公知のハードコート層であれば、特に限定されず使用できる。 An anti-scratch layer may be provided on the opposite surface of the lens portion of the lens film. Since the opposite surface is the outermost layer, it is possible to prevent the lens film from being scratched by providing a scratch-preventing layer on this surface. As the scratch-preventing layer, a layer obtained by curing the above-described curable resin is preferable, and any other known hard coat layer can be used without particular limitation.
本発明の表示画面用光学フィルターは、レンズフィルムのみからなるものであってよい。この場合は、レンズフィルムに接着剤を塗布したり、両面粘着テープを利用したり、固定治具を用いる等の方法で、レンズ面を液晶ディスプレイの表示画面側にした状態で取り付ける。レンズ部が突条の場合は、突条が上下方向に延びるように取り付ける。なお、取付けに際しては、レンズ部間の谷部の空間を保持した状態で取り付けなければならない。この空間が保持されないと、レンズ部による視野角制御機能が発現しなくなるからである。特に、接着剤を利用する場合は、谷部が埋められてしまうことがあるので、レンズフィルムの面状部のみに塗布するか、フィルターの四隅のみ塗布して固定する等の工夫が必要となる。一般的な両面粘着テープ等を利用する場合は、上記接着剤で固定する場合の問題は回避されるが、例えば、貼り付けに失敗した場合や、使用中に表示画面用光学フィルターが汚れたり傷が付いて画像の視認性が低下した場合等に、フィルターを取り外すことが困難であったり、無理に外すことで粘着剤が表示画面側に残り、画面を汚すことがあるので、フィルターの四隅で固定する等、接着剤の場合と同様の対応をするのが好ましい。 The optical filter for display screen of the present invention may be composed only of a lens film. In this case, the lens surface is attached to the display screen side of the liquid crystal display by a method such as applying an adhesive to the lens film, using a double-sided adhesive tape, or using a fixing jig. When the lens portion is a ridge, it is attached so that the ridge extends in the vertical direction. In addition, when attaching, you have to attach in the state which kept the space of the trough part between lens parts. This is because, if this space is not maintained, the viewing angle control function by the lens unit does not appear. In particular, when using an adhesive, the valley may be buried, so it is necessary to apply only to the planar portion of the lens film or to apply and fix only the four corners of the filter. . When using a general double-sided adhesive tape, etc., the problem of fixing with the above-mentioned adhesive is avoided, but for example, when pasting fails or the optical filter for display screen is dirty or scratched during use If the visibility of the image is reduced due to the mark, it may be difficult to remove the filter, or the adhesive may remain on the display screen side if it is forcibly removed. It is preferable to take the same measures as in the case of the adhesive, such as fixing.
予め、両面粘着シートとレンズフィルムを組み合わせて、表示画面用光学フィルターとしてもよい。この場合は、レンズフィルムのレンズ面に、第１粘着層、支持体、第２粘着層およびセパレートフィルムが積層された構成とするのがよい。第１粘着層とセパレートフィルムだけでも構わないが、レンズ面の接着面積は面状部のみで小さいため、表示画面への固着力を高めるには、第１粘着層を強力な粘着剤で構成する必要がある。そうすると、上記と同様の問題が発生する。そこで、上記構成のように第２粘着層を設け、後述のように自己粘着性の粘着剤で構成しておくと、貼り付けミスが起こっても、容易に剥がせる上に、再度貼り直すことができる。 It is good also as an optical filter for display screens combining a double-sided adhesive sheet and a lens film beforehand. In this case, the first adhesive layer, the support, the second adhesive layer, and the separate film are preferably laminated on the lens surface of the lens film. Although only the first adhesive layer and the separate film may be used, since the adhesion area of the lens surface is small only in the planar portion, the first adhesive layer is composed of a strong adhesive to increase the adhesion to the display screen. There is a need. Then, the same problem as described above occurs. Therefore, if the second adhesive layer is provided as in the above configuration and is composed of a self-adhesive adhesive as will be described later, it can be easily peeled off and re-applied even if a pasting error occurs. Can do.
上記第１粘着層は、レンズフィルムを両面粘着シートにしっかりと付着させるための粘着層である。第１粘着層を形成するために用いられる粘着剤は特に限定されないが、感圧粘着剤の使用が好ましい。特に、幅広いグレードのものが市販されているアクリル系粘着剤が好ましく（例えば、綜研化学社製の「ＳＫダイン」シリーズ）、特に透明性に優れた粘着層を形成し得る光学用のアクリル系粘着剤が好ましい。第１粘着層の厚さは特に限定されず、例えば、３〜２００μｍが好ましい。５〜５０μｍがより好ましく、１０〜３０μｍがさらに好ましい。 The first adhesive layer is an adhesive layer for firmly attaching the lens film to the double-sided adhesive sheet. Although the adhesive used in order to form a 1st adhesion layer is not specifically limited, Use of a pressure sensitive adhesive is preferable. In particular, acrylic adhesives that are commercially available in a wide range of grades are preferred (for example, “SK Dyne” series manufactured by Soken Chemical Co., Ltd.), and particularly acrylic acrylic adhesives that can form an adhesive layer with excellent transparency. Agents are preferred. The thickness of the 1st adhesion layer is not specifically limited, For example, 3-200 micrometers is preferable. 5-50 micrometers is more preferable and 10-30 micrometers is further more preferable.
上記支持体は、透明性に優れた樹脂フィルムが好ましい。前記したレンズフィルム用樹脂フィルムがいずれも使用可能である。支持体の厚さは特に限定されず、１〜３００μｍが好ましい。５〜１００μｍがより好ましく、１０〜５０μｍがさらに好ましい。支持体には、コロナ処理、フレーム処理、プラズマ処理等の公知の接着性向上処理を行ってもよい。 The support is preferably a resin film excellent in transparency. Any of the resin films for lens films described above can be used. The thickness of a support body is not specifically limited, 1-300 micrometers is preferable. 5-100 micrometers is more preferable and 10-50 micrometers is still more preferable. The support may be subjected to known adhesion improving treatment such as corona treatment, flame treatment, and plasma treatment.
第２粘着層は、表示画面に本発明の表示画面用光学フィルターを付着させるための粘着層である。アクリル系粘着剤でもよいが、リペア性に優れた粘着層であることが好ましく、柔軟性のある表面平滑で自己粘着性と再剥離性を有する自己粘着層とするのが好ましい。表示画面に第２粘着層を当接し、手で押さえるだけで気泡を入れることなく均一に取付けることができ、作業性が良好である。また、貼着ミスがあった場合、ゲーム機のように画面の縦と横が切り替わる場合、画面形成部が９０度回転可能に構成されている携帯電話の場合等、必要に応じて剥離し、再度貼り付けることができ、貼着ミスがあっても貼り直しが可能である。さらに剥離跡に自己粘着層が残ることがないため、表示画面を汚すこともない。 A 2nd adhesion layer is an adhesion layer for making the optical filter for display screens of this invention adhere to a display screen. An acrylic pressure-sensitive adhesive may be used, but an adhesive layer excellent in repairability is preferred, and a self-adhesive layer having a flexible surface smooth and having self-adhesiveness and removability is preferred. The second adhesive layer is brought into contact with the display screen and can be mounted uniformly without bubbles by simply pressing it with the hand, and the workability is good. In addition, when there is a sticking mistake, when the screen is switched between vertical and horizontal like a game machine, the screen forming unit is peeled off as necessary, such as a mobile phone configured to be rotated 90 degrees, It can be pasted again and can be pasted even if there is a sticking mistake. Further, since the self-adhesive layer does not remain on the peeling mark, the display screen is not soiled.
自己粘着層は、ゴムやエラストマー等で形成されていることが好ましく、ゴムとしては、天然ゴム、シリコーンゴム、エチレンプロピレンゴム、アクリロニトリルブタジエンゴム、スチレンブタジエンゴム、クロロプレンゴム、アクリルゴム、フッ素ゴム、ウレタンゴム等が、エラストマーとしては、ポリエステル系、ポリアミド系およびポリオレフィン系の熱可塑性エラストマー等が挙げられる。また塩化ビニル系樹脂に可塑剤や他の軟質ポリマーを配合した軟質塩ビも使用可能である。これらの柔軟性ポリマーは、１種類だけ用いてもよく、また２種類以上を混合して用いてもよい。これらの中では、シリコーンゴムが好ましい。上記の柔軟性ポリマーは、透明度を阻害しない範囲で各種の機能化剤、安定化剤、粘着助剤等を含有することができる。第２粘着層の厚さは特に限定されず、例えば、３〜１００μｍが好ましい。５〜８０μｍがより好ましく、８〜５０μｍがさらに好ましい。 The self-adhesive layer is preferably formed of rubber, elastomer or the like, and as rubber, natural rubber, silicone rubber, ethylene propylene rubber, acrylonitrile butadiene rubber, styrene butadiene rubber, chloroprene rubber, acrylic rubber, fluoro rubber, urethane Examples of the elastomer such as rubber include polyester-based, polyamide-based, and polyolefin-based thermoplastic elastomers. In addition, a soft PVC in which a plasticizer or other soft polymer is blended with a vinyl chloride resin can also be used. These flexible polymers may be used alone or in combination of two or more. Of these, silicone rubber is preferred. The flexible polymer can contain various functional agents, stabilizers, adhesion assistants and the like as long as the transparency is not impaired. The thickness of the 2nd adhesion layer is not specifically limited, For example, 3-100 micrometers is preferable. 5-80 micrometers is more preferable and 8-50 micrometers is still more preferable.
セパレートフィルムは、第２粘着層を保護するためのものであり、使用時には剥離されるため、透明性は要求されない。紙、合成紙、各種フィルムに、シリコーン系やフッ素系の離型処理を施したものを用いればよい。特殊な離型処理が好ましい場合もある。 The separate film is for protecting the second adhesive layer and is peeled off during use, so that transparency is not required. Paper, synthetic paper, or various films that have been subjected to silicone-based or fluorine-based release treatment may be used. A special mold release treatment may be preferable.
第１粘着層と第２粘着層は、それぞれ粘着の目的が異なるので、粘着力に差があることが好ましい。例えば、ＪＩＳ Ｚ０２３７に準じて１８０度剥離法で測定した耐熱性ガラスに対する粘着力として、第１粘着層が０．５Ｎ／２０ｍｍ超〜１０Ｎ／２０ｍｍの範囲で、第２粘着層が０．０１〜０．５Ｎ／２０ｍｍの範囲であるのが好ましい。第１粘着層は、少ない接着面積でもレンズフィルムと両面粘着シートとをしっかりと固着するためのものであるのに対し、第２粘着層は貼り直し可能なリペアー性を備えていることが好ましいためである。また、上記と同様の方法で測定したレンズフィルムと第１粘着層との間の粘着力は、０．５Ｎ／２０ｍｍ超〜８Ｎ／２０ｍｍの範囲が好ましい。なお、粘着力は、耐熱性ガラスに２０ｍｍ幅の試料を２Ｋｇのローラを用いて約２９ｍｍ／秒の速さで２往復することにより貼着し、２３℃の雰囲気下で、引張速度３００ｍｍ／ｍｉｎで引っ張り試験を行い、最大引張強度を粘着力（Ｎ／２０ｍｍ）とする。 Since the first adhesive layer and the second adhesive layer have different adhesive purposes, it is preferable that there is a difference in adhesive force. For example, as the adhesive strength to heat-resistant glass measured by 180 degree peeling method according to JIS Z0237, the first adhesive layer is in the range of more than 0.5 N / 20 mm to 10 N / 20 mm, and the second adhesive layer is 0.01 to A range of 0.5 N / 20 mm is preferable. The first pressure-sensitive adhesive layer is for firmly fixing the lens film and the double-sided pressure-sensitive adhesive sheet even with a small adhesive area, whereas the second pressure-sensitive adhesive layer preferably has a repairability that allows re-sticking. It is. Moreover, the adhesive force between the lens film and the first adhesive layer measured by the same method as described above is preferably in the range of more than 0.5 N / 20 mm to 8 N / 20 mm. The adhesive force was adhered to a heat-resistant glass by reciprocating twice a 20 mm wide sample at a speed of about 29 mm / second using a 2 kg roller, and in a 23 ° C. atmosphere, a tensile speed of 300 mm / min. The tensile test is performed with the maximum tensile strength as the adhesive strength (N / 20 mm).
第１粘着層や第２粘着層が支持体との間で界面剥離を起こすのを防止するために、支持体と各粘着層との間に、公知の接着改良層等を設けてもよい。 In order to prevent the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer from causing interfacial peeling between the support and the support, a known adhesion improving layer or the like may be provided between the support and each pressure-sensitive adhesive layer.
上記の両面粘着シートを備えた本発明の表示画面用光学フィルターの製造方法は特に限定されないが、最も簡便な方法は、レンズフィルムと両面粘着シートを別々に製造し、レンズフィルムのレンズ面を両面粘着シートの第１粘着層に貼り付ける方法である。 The manufacturing method of the optical filter for display screen of the present invention provided with the above double-sided pressure-sensitive adhesive sheet is not particularly limited, but the simplest method is to separately manufacture the lens film and the double-sided pressure-sensitive adhesive sheet, and the lens surface of the lens film is double-sided. It is the method of affixing on the 1st adhesion layer of an adhesive sheet.
本発明の表示画面用光学フィルターは、第２粘着層のセパレートフィルムを剥がし、液晶ディスプレイの表示画面に貼り付けることで使用できる。レンズ部が突条の場合は、突条が上下方向に延びるように取り付ける。 The optical filter for display screens of the present invention can be used by peeling off the separate film of the second adhesive layer and attaching it to the display screen of the liquid crystal display. When the lens portion is a ridge, it is attached so that the ridge extends in the vertical direction.
以下、実施例を挙げて本発明をより具体的に説明するが、本発明は、もとより下記実施例によって制限を受けるものではなく、本発明の趣旨に適合し得る範囲で適宜変更を加えて実施することも可能であり、それらは、いずれも本発明の技術的範囲に含まれる。 Hereinafter, the present invention will be described in more detail with reference to examples. However, the present invention is not limited by the following examples, but may be implemented with appropriate modifications within a scope that can meet the gist of the present invention. These are all included in the technical scope of the present invention.
参考例１
レンズフィルムの基材フィルムとして「コスモシャイン（登録商標）Ａ４３００」（東洋紡績社製の両面易接着処理済みポリエステルフィルム；厚さ５０μｍ）を用い、片面に紫外線硬化型ハードコート塗料（大日精化工業社製；「セイカビーム（登録商標）ＥＸＦ−０１Ｂ」）を乾燥後の膜厚が５μｍになるように塗工し、乾燥して溶剤を除去した。高圧水銀灯で、８００ｍＪ／ｃｍ２の紫外線を照射して塗膜を硬化させ、平滑な傷付き防止層を形成した。
Reference example 1
Lens as the base film of the film "COSMOSHINE (registered trademark) A 4300" (manufactured by Toyobo Co., Ltd. sided easy-adhesion treated polyester film; thickness 50 [mu] m) using a UV-curable hard coating composition on one side (atmospheric NISSEI Chemical Industry “Seika Beam (registered trademark) EXF-01B”) was applied so that the film thickness after drying was 5 μm, and the solvent was removed by drying. The coating film was cured by irradiating with 800 mJ / cm 2 ultraviolet rays with a high-pressure mercury lamp to form a smooth scratch-resistant layer.
この傷付き防止層の反対面側に、アクリル系紫外線硬化性樹脂（テスク社製；「Ａ−１７１９」）を、厚さ３５μｍとなるように塗布した。３００ｍＪ／ｃｍ2の紫外線を照射して、塗膜を半硬化させた。次いで、図３に示した縦断面台形状を有する直線突条のレンズ部を形成するために、直線突条に対応する溝状部を有する彫刻ロールを用いて、上記半硬化塗膜に直線突条を形成した。続いて、７００ｍＪ／ｃｍ2の紫外線を照射して、塗膜を完全に硬化させた。図２に示したような直線突条のレンズ部が多数並設されたレンズフィルムが得られた。なお、直線突条の断面は、図３におけるＬ1が１８μｍ、Ｌ2が３３μｍ、Ｌ3が１８μｍ、Ｈが２９μｍ、θが約７５度である等脚台形とした。 An acrylic ultraviolet curable resin (manufactured by Tesque; “A-1719”) was applied to the opposite side of the scratch-preventing layer so as to have a thickness of 35 μm. The coating film was semi-cured by irradiating 300 mJ / cm 2 of ultraviolet rays. Next, in order to form the lens portion of the linear ridge having the trapezoidal shape shown in FIG. 3, a linear protrusion is applied to the semi-cured coating film using an engraving roll having a groove-shaped portion corresponding to the linear ridge. Formed an article. Subsequently, 700 mJ / cm 2 of ultraviolet light was irradiated to completely cure the coating film. As a result, a lens film having a large number of linear protrusion lens portions as shown in FIG. 2 was obtained. In addition, the cross-section of the straight ridges was an isosceles trapezoid with L 1 of 18 μm, L 2 of 33 μm, L 3 of 18 μm, H of 29 μm, and θ of about 75 degrees in FIG.
上記レンズフィルムを携帯電話の表示画面（ディスプレイ部）に固定治具で取り付けた。取付けに際しては、レンズ部を表示画面側に向けて、突条が上下方向に延びるように取り付けた。 The lens film was attached to a display screen (display unit) of a mobile phone with a fixing jig. At the time of attachment, the lens portion was attached to the display screen side so that the protrusions extended in the vertical direction.
画像を表示させて正面から見たところ、よく見え、視認性良好であったが、横方向から斜めに見た場合、画像が見えにくく視認性が低下した。本発明の光学フィルターは視野角制御機能が優れていることが確認できた。また、この視野角制御機能は雰囲気の明るさに関係なく維持されており、覗き見防止効果は明所および暗所のいずれにおいても発現した。 When the image was displayed and viewed from the front, it looked good and the visibility was good, but when viewed obliquely from the horizontal direction, the image was difficult to see and the visibility was lowered. It was confirmed that the optical filter of the present invention has an excellent viewing angle control function. Moreover, this viewing angle control function was maintained regardless of the brightness of the atmosphere, and the peep prevention effect was manifested in both bright and dark places.
比較例１
参考例１で得られたレンズフィルムを、参考例１で用いた携帯電話の表示画面に、レンズ部が表示画面側と反対側になるように固定するように変更する以外は、参考例１と同様にして取り付けた。画像を表示させて正面から見たところ、よく見え、視認性良好であった。明るい雰囲気下、例えば、外光が充分に採り入れられた雰囲気下や、照明が点灯された状態の室内においては、横方向からの視認性が低下し、視野角制御機能が発現したが、暗い雰囲気下、例えば夜間で照明の届かない場所や、地下鉄の電車内部等では、横方向からも画像がよく見え、正面からの視認性とほとんど変化なく、視野角制御機能が発現しないことが確認できた。
Comparative Example 1
The lens film obtained in Reference Example 1, the display screen of the mobile phone used in Reference Example 1, except for changing such that the lens unit is fixed so that the side opposite to the side of the display screen, as in Reference Example 1 Attached in the same manner. When the image was displayed and viewed from the front, it looked good and the visibility was good. In a bright atmosphere, for example, in an atmosphere in which external light is sufficiently adopted, or in a room that is lit up, the visibility from the lateral direction is reduced and the viewing angle control function is developed, but the dark atmosphere Below, for example, in places where there is no illumination at night, inside a subway train, etc., the image can be seen well from the horizontal direction, and it has been confirmed that the viewing angle control function does not appear with almost no change from the front visibility. .
比較例２
液晶表示装置において輝度向上用のプリズムシートとして市販されている、断面正三角形（底辺長５０μｍ、高さ２５μｍ）の三角柱が、頂角が９０度になるように並列している構成のレンズフィルム（厚さ３１３μｍ）を、参考例１と同様にして、三角柱の頂点を表示画面側に向けて固定治具で取り付けた。画像を表示させて正面から見たところ、画像の輪郭がぼやけていた。また、視野角制御機能も参考例１の光学フィルターよりもかなり劣っていた。
Comparative Example 2
A lens film having a structure in which triangular prisms having a regular triangular section (base length: 50 μm, height: 25 μm) arranged in parallel so that the apex angle is 90 degrees, which is commercially available as a prism sheet for improving luminance in a liquid crystal display device In the same manner as in Reference Example 1, a thickness of 313 μm) was attached with a fixing jig with the apex of the triangular prism facing the display screen side. When the image was displayed and viewed from the front, the outline of the image was blurred. Also, the viewing angle control function was considerably inferior to that of the optical filter of Reference Example 1.
参考例２
参考例１で用いた携帯電話の表示画面の四隅に透明タイプの両面粘着テープを小さく切って貼り、このテープを用いて、参考例１で得られたレンズフィルムを、レンズ部が表示画面側になるように、かつ、突条が上下方向に延びるように、取り付けた。この光学フィルターは参考例１と同等の性能を有しており、視野角制御機能に優れていた。
Reference example 2
Paste cut small double-sided adhesive tape of transparent type at the four corners of the display screen of the cellular phone used in Reference Example 1, and have use of this tape, a lens film obtained in Reference Example 1, the lens unit side of the display screen It was attached so that the ridges would extend in the vertical direction. This optical filter had the same performance as in Reference Example 1 and was excellent in the viewing angle control function.
実施例３
シリカ等の補強剤を実質的に含まず、数平均分子量が１５万（ＧＰＣ法で測定、ポリスチレン換算）の未架橋のポリジメチルシロキサン骨格よりなる非反応性のシリコーン化合物（ＫＦ−９６Ｈ−５０万ｃｓ；信越化学工業社製）を、トルエンに対する質量比率が２３％となるように秤量し、トルエンと共に真空脱泡装置付き撹拌機に投入し、大気圧下、室温で１５時間撹拌して、トルエンに溶解させた。得られた溶液に、上記シリコーン化合物１００質量部に対して、トリメチロールプロパントリメタクリレートが２質量部となるように添加し、均一に撹拌した後、真空脱泡装置を駆動し、ゲージ圧が−７５０mmHg（−０．１ＭＰａ）の真空下でさらに２０分間撹拌し、脱泡した。次いで、脱泡後のシリコーン化合物溶液をロールコーターに供給し、前記した「コスモシャイン（登録商標）Ａ４３００」（厚さ３８μｍ）の片面に、シリコーン化合物溶液を乾燥後の厚みが２５μｍとなるように塗布し、続いてオーブンに導入して８０℃で乾燥した。
Example 3
A non-reactive silicone compound (KF-96H-500,000) comprising an uncrosslinked polydimethylsiloxane skeleton having substantially no reinforcing agent such as silica and having a number average molecular weight of 150,000 (measured by GPC method, converted to polystyrene). cs; manufactured by Shin-Etsu Chemical Co., Ltd.) was weighed so that the mass ratio with respect to toluene was 23%, and was put together with toluene into a stirrer equipped with a vacuum deaerator and stirred at room temperature for 15 hours under atmospheric pressure. Dissolved in. To the obtained solution, trimethylolpropane trimethacrylate was added to 2 parts by mass with respect to 100 parts by mass of the silicone compound, and after stirring uniformly, the vacuum deaerator was driven and the gauge pressure was- The mixture was further stirred for 20 minutes under a vacuum of 750 mmHg (−0.1 MPa) to degas. Next, the defoamed silicone compound solution is supplied to a roll coater, and the thickness after drying the silicone compound solution is 25 μm on one side of “Cosmo Shine (registered trademark) A4300” (thickness 38 μm). It was applied and subsequently introduced into an oven and dried at 80 ° C.
その後、ポリエステル系バインダー樹脂、高分子ワックスおよびアニオン系帯電防止剤および表面粗面化物質よりなる離型層を積層したポリエチレンテレフタレートからなる厚さ３８μｍのセパレートフィルムの離型層側が接するように積層し、２００ＫＶ、１８Ｍｒａｄのエネルギーで電子線を照射してシリコーンゴム粘着層の架橋を行った。 Thereafter, lamination was performed so that the release layer side of a 38 μm-thick separate film made of polyethylene terephthalate in which a release layer comprising a polyester binder resin, a polymer wax, an anionic antistatic agent and a surface roughening material was laminated was in contact. The silicone rubber adhesive layer was crosslinked by irradiating an electron beam with an energy of 200 KV and 18 Mrad.
続いて、もう片面に、光学用アクリル系粘着剤であるＳＫダイン２０９４（綜研化学社製）を乾燥後の厚さが２５μｍになるように塗布し、１３０℃で３分間乾燥し、アクリル感圧粘着層を形成した。この粘着層の上にシリコーン処理されたポリエチレンテレフタレートからなる厚さ３８μｍのセパレートフィルム（Ｅ７００２；東洋紡績社製）を積層し、両面粘着シートを得た。 Subsequently, SK Dyne 2094 (manufactured by Soken Chemical Co., Ltd.), which is an optical acrylic adhesive, was applied to the other side so that the thickness after drying was 25 μm, dried at 130 ° C. for 3 minutes, and acrylic pressure sensitive An adhesive layer was formed. A 38 μm-thick separate film (E7002; manufactured by Toyobo Co., Ltd.) made of polyethylene-terephthalate treated with silicone was laminated on the adhesive layer to obtain a double-sided adhesive sheet.
参考例１で得られたレンズフィルムを上記両面粘着シートと貼り合わせ、本発明の光学フィルターを得た。貼り合わせに際しては、レンズ面の面状部とアクリル感圧粘着層（第１粘着層に該当する）とを貼り合わせた。このフィルターを、参考例１で用いたものと同じ携帯電話の表示画面に、シリコーンゴム自己粘着層（第２粘着層に該当する）で、直線突条が上下方向に延びるように貼り付けた。この光学フィルターは参考例１と同等の性能を有しており、視野角制御機能に優れていた。 The lens film obtained in Reference Example 1 was bonded to the double-sided pressure-sensitive adhesive sheet to obtain the optical filter of the present invention. At the time of bonding, the surface portion of the lens surface and the acrylic pressure-sensitive adhesive layer (corresponding to the first adhesive layer) were bonded together. This filter was affixed to the same mobile phone display screen as used in Reference Example 1 with a silicone rubber self-adhesive layer (corresponding to the second adhesive layer) so that the linear protrusions extend in the vertical direction. This optical filter had the same performance as in Reference Example 1 and was excellent in the viewing angle control function.
この構成の光学フィルターは、予め両面粘着シートがレンズフィルムに一体化されているため、貼着性に優れていた。また、自己粘着層はリペアー性を有しているので、簡単に取り外せ、再度貼着することもできた。一旦、取り外したときには、表示画面には全く糊残りはなく、表示画面の汚染は認められなかった。 The optical filter having this configuration was excellent in sticking property because the double-sided pressure-sensitive adhesive sheet was previously integrated with the lens film. Further, since the self-adhesive layer has repairability, it could be easily removed and pasted again. Once removed, there was no glue residue on the display screen and no contamination of the display screen was observed.
なお、別途粘着力を前記した方法で測定したところ、レンズフィルムとアクリル系の感圧粘着層（第１粘着層）との粘着力は４．８Ｎ／２０ｍｍであり、第１粘着層と耐熱性ガラスとの粘着力は１１．４Ｎ／２０ｍｍであった。シリコーンゴム第２粘着層と耐熱性ガラスとの粘着力は０．１Ｎ／２０ｍｍであった。 In addition, when the adhesive force was separately measured by the method described above, the adhesive force between the lens film and the acrylic pressure-sensitive adhesive layer (first adhesive layer) was 4.8 N / 20 mm, and the first adhesive layer and the heat resistance The adhesive strength with glass was 11.4 N / 20 mm. The adhesive strength between the silicone rubber second adhesive layer and the heat-resistant glass was 0.1 N / 20 mm.
比較例３
実施例３において、レンズフィルムを、レンズ部と反対面側がアクリル系感圧粘着層と接するように貼り合わせる以外は実施例３と同様にして光学フィルターを得て、参考例１と同様の携帯電話の表示画面に、実施例３と同様に貼り付けた。この光学フィルターは比較例１の光学フィルターと同様に視野角制御機能が劣っていた。
Comparative Example 3
In Example 3, an optical filter was obtained in the same manner as in Example 3 except that the lens film was bonded so that the side opposite to the lens part was in contact with the acrylic pressure-sensitive adhesive layer, and the same cellular phone as in Reference Example 1 was obtained. Was pasted on the display screen in the same manner as in Example 3. Similar to the optical filter of Comparative Example 1, this optical filter had a poor viewing angle control function.
比較例４
アクリル感圧粘着層を形成する前の工程までを実施例３と同様にして、片面にシリコーンゴム系自己粘着層が形成された片面粘着シートを得た。この片面粘着シートのシリコーンゴム系自己粘着層と反対面側に、アクリル系ＵＶ硬化型透明接着剤（ＮＯＲＬＡＮＤ社製ＵＶ硬化型接着剤；ＮＯＡ７２）を用いて、参考例１で得られたレンズフィルムのレンズ部がポリエステルフィルム支持体に当接するように接着した（照射量７００ｍＪ／ｃｍ２）。このフィルターの自己粘着層で参考例１と同様の携帯電話の表示画面に、実施例３と同様に貼り付けた。接着剤でレンズフィルムと片面粘着シートを固着する際にレンズ部の谷部が接着剤によって埋められてしまったため、レンズ効果が消失し、このフィルターでは、視野角制御機能が発現しなかった。
Comparative Example 4
The process up to the step before forming the acrylic pressure-sensitive adhesive layer was carried out in the same manner as in Example 3 to obtain a single-sided adhesive sheet having a silicone rubber self-adhesive layer formed on one side. The lens film obtained in Reference Example 1 using an acrylic UV curable transparent adhesive (UV curable adhesive manufactured by NORLAND, NOA72) on the side opposite to the silicone rubber self-adhesive layer of the single-sided adhesive sheet. The lens part was bonded so as to contact the polyester film support (irradiation amount 700 mJ / cm 2 ). The self-adhesive layer of this filter was attached to the display screen of the same mobile phone as in Reference Example 1 in the same manner as in Example 3. When the lens film and the single-sided pressure-sensitive adhesive sheet were fixed with an adhesive, the valley of the lens portion was filled with the adhesive, so the lens effect disappeared, and this filter did not exhibit the viewing angle control function.
比較例５
比較例２で用いたプリズムシートを、実施例３と同様にして両面粘着シートと一体化させて、光学フィルターを得た。実施例３と同様にして携帯電話に貼り合わせたが、正面から見たときの画像の輪郭がぼやけており、実施例３に比べ視認性が低下していた。また、視野角制御機能も劣っていた。また、この光学フィルターは、レンズ部とアクリル系感圧粘着層との粘着力が弱く、軽い力でレンズフィルムが剥離することがあった。
Comparative Example 5
The prism sheet used in Comparative Example 2 was integrated with the double-sided PSA sheet in the same manner as in Example 3 to obtain an optical filter. Affixed to the mobile phone in the same manner as in Example 3, but the outline of the image when viewed from the front was blurred, and the visibility was lower than that in Example 3. Also, the viewing angle control function was inferior. Further, this optical filter has a weak adhesive force between the lens portion and the acrylic pressure-sensitive adhesive layer, and the lens film may be peeled off with a light force.
実施例４
直線突条の断面形状を図４に示した凸字状に変更する以外は、参考例１および実施例３と同様にして光学フィルターを得た。実施例３と同様にして携帯電話の表示画面に取り付けたところ、実施例３の光学フィルターと同等の性能を有しており、視野角制御機能に優れるものであった。
Example 4
An optical filter was obtained in the same manner as in Reference Example 1 and Example 3 except that the cross-sectional shape of the straight ridge was changed to the convex shape shown in FIG. When attached to the display screen of the mobile phone in the same manner as in Example 3, it had the same performance as the optical filter of Example 3 and was excellent in viewing angle control function.
実施例５
レンズフィルムとして、ポリカーボネート樹脂フィルム（三菱エンジニアリングプラスチックス社製；「ＦＥ−２０００」；厚さ１００μｍ）の片面に、加熱エンボスロールで参考例１と同一形状のレンズ部を形成したものを用いた以外は実施例３と同様にして光学フィルターを得て、携帯電話に貼り合わせた。このフィルターは、実施例３の光学フィルターと同等の性能を有しており、視野角制御機能に優れるものであった。
Example 5
As the lens film, a polycarbonate resin film (manufactured by Mitsubishi Engineering Plastics; “FE-2000”; thickness 100 μm) is used except that a lens portion having the same shape as that of Reference Example 1 is formed with a heated embossing roll. Obtained an optical filter in the same manner as in Example 3, and was bonded to a mobile phone. This filter had the same performance as the optical filter of Example 3, and was excellent in the viewing angle control function.
本発明の表示画面用光学フィルターは、液晶表示装置を使用する際の周囲の明暗にかかわらず、正面から眺めたときの画像視認性に優れ、かつ、視野角制御機能にも優れており、横からの覗き見を防止することが可能である。従って、本発明の表示画面用光学フィルターは、パソコン、コピー機、ファクシミリ等のＯＡ機器、キャッシュディスペンサー、ＡＴＭ、ゲーム機、テレビ、時計、携帯電話等、広い分野で使用されている液晶表示装置の視野角制御用の光学フィルターとして有用である。 The optical filter for a display screen of the present invention has excellent image visibility when viewed from the front regardless of the brightness of the surroundings when using a liquid crystal display device, and also has an excellent viewing angle control function. It is possible to prevent peeping from. Accordingly, the optical filter for display screen of the present invention is a liquid crystal display device used in a wide range of fields such as OA equipment such as personal computers, copy machines, facsimiles, cash dispensers, ATMs, game machines, TVs, watches, mobile phones and the like. It is useful as an optical filter for viewing angle control.
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| JP5260259B2 (en) * | 2008-12-22 | 2013-08-14 | 東洋紡株式会社 | Optical filter for display screen |
| JP5822102B2 (en) * | 2009-10-22 | 2015-11-24 | 東洋紡株式会社 | Viewing angle enhancement film for liquid crystal display device, protective film with viewing angle enhancement function, and liquid crystal display device |
| JP5822103B2 (en) * | 2009-10-22 | 2015-11-24 | 東洋紡株式会社 | Viewing angle improving film for liquid crystal display device, protective film with viewing angle improving function, and liquid crystal display device |
| JP2013190608A (en) * | 2012-03-14 | 2013-09-26 | Toshiba Mach Co Ltd | Anti-peep film, manufacturing device of anti-peep film, and method of manufacturing anti-peep film |
| JP2016110034A (en) * | 2014-12-10 | 2016-06-20 | 凸版印刷株式会社 | Anti-peep transparent film and manufacturing method of the same |
| US10429553B2 (en) | 2015-02-27 | 2019-10-01 | Corning Incorporated | Optical assembly having microlouvers |
| WO2020044830A1 (en) * | 2018-08-28 | 2020-03-05 | シャープ株式会社 | Daylighting device |
| US20210389505A1 (en) * | 2020-06-11 | 2021-12-16 | Luminit Llc | Anti-glare, privacy screen for windows or electronic device displays |
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| JP2002328206A (en) * | 2001-05-07 | 2002-11-15 | Kureha Elastomer Co Ltd | Optical filter for display screen |
| JP3090774U (en) * | 2002-06-17 | 2002-12-26 | クレハエラストマー株式会社 | Optical filter for display screen |
| JP2005049754A (en) * | 2003-07-31 | 2005-02-24 | Toppan Printing Co Ltd | Display device using visible angle adjusting film |
| JP4459684B2 (en) * | 2004-03-31 | 2010-04-28 | 大日本印刷株式会社 | Peep prevention medium and peep prevention label |
| JP3121071U (en) * | 2006-01-30 | 2006-04-27 | ブラウン株式会社 | Display device |
| JP2007272065A (en) * | 2006-03-31 | 2007-10-18 | Mitsubishi Rayon Co Ltd | Optical film, and method for manufacturing the same |
| JP2007249210A (en) * | 2007-03-15 | 2007-09-27 | Kureha Elastomer Co Ltd | Optical filter for display screen |
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