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JP2008176206A - Optical laminate for display panel - Google Patents

Optical laminate for display panel Download PDF

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JP2008176206A
JP2008176206A JP2007011462A JP2007011462A JP2008176206A JP 2008176206 A JP2008176206 A JP 2008176206A JP 2007011462 A JP2007011462 A JP 2007011462A JP 2007011462 A JP2007011462 A JP 2007011462A JP 2008176206 A JP2008176206 A JP 2008176206A
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optical functional
adhesive
optical
layer
prism
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Makoto Inanaga
誠 稲永
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Mitsubishi Chemical Corp
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Mitsubishi Plastics Industries Ltd
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Abstract

【課題】複数の光学機能層を予め積層一体化してなるディスプレイパネル用光学積層体において、光学機能層間に必要な空気容量を有する空気層を形成する。
【解決手段】少なくとも2層の光学機能層間を部分的に接着し、該光学機能層間における接着部以外の部位を空気空隙部とすることにより、複数の光学機能層を予め積層一体化して提供することができ、しかも光学積層体全体の厚みを抑えつつ、光学機能層間に必要な空気容量を有する空気空隙部(空気層)を設けることができる。
【選択図】図2
In an optical laminated body for a display panel in which a plurality of optical functional layers are laminated and integrated in advance, an air layer having a necessary air capacity is formed between optical functional layers.
A plurality of optical functional layers are preliminarily laminated and provided by partially adhering at least two optical functional layers and forming an air gap portion other than the adhesive portion between the optical functional layers. In addition, an air gap portion (air layer) having a necessary air capacity can be provided between the optical functional layers while suppressing the thickness of the entire optical laminate.
[Selection] Figure 2

Description

本発明は、液晶ディスプレイやプラズマディスプレイに代表されるフラットパネルディスプレイを構成する、複数の光学機能層を積層一体化してなるディスプレイパネル積層体、中でも液晶セルの後側面と光源との間に配置される液晶バックライト用光学積層体に関する。   The present invention is a display panel laminate comprising a plurality of optical functional layers laminated and integrated, which constitutes a flat panel display typified by a liquid crystal display or a plasma display, and is disposed between a rear surface of a liquid crystal cell and a light source. The present invention relates to an optical laminate for a liquid crystal backlight.

従来、液晶セルの後側面と光源との間には、セル後面に直接積層された偏光層、光のP成分のみ透過しS成分は反射する特殊偏光層、拡散した光を一方向に揃えると共に揃えきれなかった光を反射するプリズム層、光源の光を拡散して光源の輪郭を消す光拡散層など、各種機能を備えた光学機能層をそれぞれ空気層を介して積層してなる積層体が配置されていた(例えば特許文献1−3参照)。   Conventionally, between the back side of the liquid crystal cell and the light source, a polarizing layer directly stacked on the back side of the cell, a special polarizing layer that transmits only the P component of light and reflects the S component, and aligns diffused light in one direction A laminated body in which optical functional layers having various functions are laminated via an air layer, such as a prism layer that reflects light that has not been aligned, and a light diffusion layer that diffuses light from the light source and erases the outline of the light source. (See, for example, Patent Documents 1-3).

ディスプレイパネル積層体において空気層は、各光学機能層と空気層との屈折率差によって光の方向を有用な方向に曲げるだけでなく、空気層において界面に入射する不要な方向の光を反射させて光源側に戻すと共に、光源側に戻した光を再反射させて有用な方向の光に変化させるなど、空間層は光学的にも重要な役割を果たしている。   In the display panel laminate, the air layer not only bends the light direction to a useful direction due to the refractive index difference between each optical functional layer and the air layer, but also reflects light in an unnecessary direction incident on the interface in the air layer. Thus, the spatial layer plays an important role optically, such as returning to the light source side and re-reflecting the light returned to the light source side to change the light into a useful direction.

特開2006−091896JP 2006-091896 A 特開2005−327600JP-A-2005-327600 特開2004−354678JP 2004-354678 A

前記のように光学機能層間に介在する空気層は光学的に重要な役割を果たすため、ディスプレイパネル積層体においては、所定の空気容量を有する空気層を備えることが求められる。しかし、スペーサ(枠)等を介して光学機能層間を接合して光学機能層間に空気層を介在させると全体の厚みが増すため、液晶テレビ等の薄型化の要求に応えることが難しくなる。そこで、スペーサ(枠)等を介さずに光学機能層間を接合し、且つ光学機能層間に空気層を介在させることが求められる。   As described above, since the air layer interposed between the optical functional layers plays an optically important role, the display panel laminate is required to have an air layer having a predetermined air capacity. However, if the optical functional layers are joined via a spacer (frame) or the like and an air layer is interposed between the optical functional layers, the overall thickness increases, making it difficult to meet the demand for thin liquid crystal televisions and the like. Therefore, it is required to join the optical functional layers without using a spacer (frame) or the like, and to interpose an air layer between the optical functional layers.

また、最近では液晶テレビ等の大型化に伴い、輝度向上のために光源本数が増加する傾向にあり、筐体内部が過熱状態となり易い。このような過熱環境下に光学機能層が独立した状態で存在すると、各光学機能層自体は薄いため、熱によって弛みやシワが生じて画面の輝度が不均一になり易い。このため、複数の光学機能層を予め積層一体化して光学積層体とし、過熱環境下でも弛みやシワが生じないようにすることも求められる。予め積層一体化した光学積層体であれば、製造面からみても、光学機能層を積層して組み立てる手間を省くことができ、しかも、光学機能層間の位置関係を一定に維持することができる点で有利でもある。   In recent years, with the increase in size of liquid crystal televisions and the like, the number of light sources tends to increase in order to improve luminance, and the inside of the housing tends to be overheated. When the optical functional layers are present in an independent state in such an overheated environment, each optical functional layer itself is thin, so that heat is likely to cause slack and wrinkles, resulting in non-uniform screen brightness. For this reason, it is also required that a plurality of optical functional layers be laminated and integrated in advance to form an optical layered body so that slack and wrinkles do not occur even in an overheated environment. If the optical layered body is laminated and integrated in advance, it is possible to save the trouble of laminating and assembling the optical functional layers from the viewpoint of manufacturing, and to maintain the positional relationship between the optical functional layers constant. It is also advantageous.

本発明は、かかる課題に鑑みて、複数の光学機能層を予め積層一体化してなるディスプレイパネル用光学積層体であって、所望する光学機能層間に、必要な空気容量を有する空気層を形成することができる構成を備えたディスプレイパネル用光学積層体を提供せんとするものである。   In view of such problems, the present invention is an optical laminate for a display panel in which a plurality of optical functional layers are laminated and integrated in advance, and an air layer having a necessary air capacity is formed between desired optical functional layers. It is an object of the present invention to provide an optical laminate for a display panel having a configuration that can be used.

本発明は、複数の光学機能層を粘着剤乃至接着剤で固着し積層一体化してなるディスプレイパネル用光学積層体であって、少なくとも2層の光学機能層間を部分的に接着し、該光学機能層間における接着部以外の部位を空気空隙部としてなる構成を備えたディスプレイパネル用光学積層体を提案する。   The present invention is an optical laminate for a display panel in which a plurality of optical function layers are fixed and integrated with a pressure-sensitive adhesive or an adhesive, and at least two optical function layers are partially bonded to each other. An optical laminate for a display panel having a configuration in which a portion other than an adhesive portion between layers is used as an air gap is proposed.

このような構成を備えたディスプレイパネル用光学積層体であれば、複数の光学機能層を予め積層一体化して提供することができる。例えば液晶テレビの製造工程であれば、光学機能層の組み立て工程を省くことができ、しかも、光学機能層間の位置関係を一定に維持することができる。さらに、光学積層体を収納する筐体の内部が過熱状態となったとしても、積層一体化されているために弛みやシワを生じ難く、画面の輝度を均一に維持することができる。
また、光学機能層間を部分的に接着し、この接着部以外の部位を空気空隙部とすることにより、接着層が空気層の役割を備えることができるから、光学積層体全体の厚みを抑えつつ、しかも光学機能層間に必要な空気容量を備えた空気空隙部(空気層)を設けることができる。
If it is the optical laminated body for display panels provided with such a structure, a several optical functional layer can be laminated | stacked and integrated previously and provided. For example, in the manufacturing process of a liquid crystal television, the assembly process of the optical functional layer can be omitted, and the positional relationship between the optical functional layers can be maintained constant. Furthermore, even if the inside of the housing that houses the optical laminate is overheated, the laminated body is integrated, so that slack and wrinkles are unlikely to occur, and the brightness of the screen can be maintained uniformly.
Moreover, since the adhesive layer can serve as an air layer by partially adhering the optical functional layers and making the air gap part other than the adhesive part, the thickness of the entire optical laminate is suppressed. Moreover, an air gap (air layer) having a necessary air capacity can be provided between the optical functional layers.

本発明の好ましい一例として、例えば図2に示されるように、平面状の裏面を備えた光学機能層と、多数の凸部が形成されたプリズム面を表面に備えた光学機能層との積層において、光学機能層の表面に形成された凸部の高さよりも小さな厚みとなるように、光学機能層の裏面に粘着剤乃至接着剤を塗布して接着層を形成し、光学機能層の表面に形成されたプリズム面における凸部の頂点が前記接着層内に埋まるようにして光学機能層と光学機能層とを積層することによって、凸部間に空気空隙部を残してなる構成を備えたディスプレイパネル用光学積層体を挙げることができる。
このように多数の凸部が表面に形成されたプリズム層においては、粘着剤乃至接着剤によってプリズム面の凹凸を完全に埋めてしまうと十分な屈折率差が得られなくなり、光学機能を果たさなくなってしまう。これに対し、上記のように構成すれば、凸部間に空気空隙部を残すことができるため、凸部(プリズム形状)と空気との屈折率差によるレンズ作用(プリズム効果)を得ることができる。
As a preferred example of the present invention, for example, as shown in FIG. 2, in the lamination of an optical functional layer having a planar back surface and an optical functional layer having a prism surface on which a large number of convex portions are formed. The adhesive layer is formed by applying an adhesive or adhesive to the back surface of the optical functional layer so that the thickness is smaller than the height of the convex portion formed on the surface of the optical functional layer. A display having a configuration in which an air gap portion is left between the convex portions by laminating the optical functional layer and the optical functional layer so that the apex of the convex portion on the formed prism surface is buried in the adhesive layer. The optical laminated body for panels can be mentioned.
In such a prism layer having a large number of convex portions formed on the surface, if the unevenness of the prism surface is completely filled with an adhesive or adhesive, a sufficient difference in refractive index cannot be obtained and the optical function cannot be performed. End up. On the other hand, if it comprises as mentioned above, since an air space part can be left between convex parts, the lens operation (prism effect) by the refractive index difference of a convex part (prism shape) and air can be obtained. it can.

以下、本発明の実施形態について説明するが、本発明の範囲がかかる実施形態に制限されるものではない。   Hereinafter, embodiments of the present invention will be described, but the scope of the present invention is not limited to such embodiments.

なお、「フィルム」「シート」および「パネル」は、厚さによってそれぞれ区別されるのが一般的であるが、本発明においては、特にそれぞれの厚さを厳密には問題としないため、「フィルム」と称する場合でも「シート」や「パネル」を含むものとし、「シート」と称する場合でも「フィルム」「パネル」を含むものとし、「パネル」と称する場合でも「フィルム」「シート」を含むものとする。
また、本明細書において、「X〜Y」(X,Yは任意の数字)と記載した場合、特にことわらない限り「X以上Y以下」の意と共に、「Xより大きくYより小さいのが好ましい」の意を包含する。
The “film”, “sheet”, and “panel” are generally distinguished from each other depending on the thickness. However, in the present invention, the thickness is not particularly a problem. "Sheet" and "panel" are included, "sheet" includes "film" and "panel", and "panel" includes "film" and "sheet".
In addition, in this specification, when “X to Y” (X and Y are arbitrary numbers) is described, it means “greater than X and smaller than Y” with the meaning of “X or more and Y or less” unless otherwise specified. “Preferred” is included.

本実施形態に係るディスプレイパネル用光学積層体(以下、「本光学積層体」という)は、複数の光学機能フィルム(それぞれが請求項の「光学機能層」に相当)、例えば液晶セルの後側面と光源との間に配置される、偏光フィルム、特殊偏光フィルム、プリズムフィルム、光拡散フィルムなどの各種光学機能を備えた光学機能フィルムを、粘着剤乃至接着剤で固着し積層一体化してなるディスプレイパネル用光学積層体であって、前記複数の光学機能フィルムのうちの少なくとも2つの光学機能フィルム(それぞれが請求項の「光学機能層」に相当)間を部分的に接着し、該接着部以外の部位を空気空隙部としてなる構成を備えたディスプレイパネル用光学積層体である。   An optical laminate for a display panel according to the present embodiment (hereinafter referred to as “the present optical laminate”) includes a plurality of optical functional films (each corresponding to an “optical functional layer” in the claims), for example, a rear surface of a liquid crystal cell Display composed of optical functional films with various optical functions, such as polarizing films, special polarizing films, prism films, and light diffusion films, which are placed between the light source and the light source, and are laminated and integrated with an adhesive or adhesive. An optical laminated body for a panel, wherein at least two optical functional films (each corresponding to an “optical functional layer” in the claims) of the plurality of optical functional films are partially bonded to each other, except for the bonded portion It is the optical laminated body for display panels provided with the structure which uses this part as an air space | gap part.

本光学積層体において、積層する光学機能フィルム(請求項の「光学機能層」に相当)の種類、数、それぞれの厚さなどは任意に選択することができる。
なお、光学機能フィルムの厚さが50μm〜500μmと薄ければ、本発明の効果をより一層享受することができる。各光学機能フィルムが薄い場合、これらを単に重ね合わせただけでは弛みやシワを生じ易く、過熱環境下では熱によって弛みやシワがさらに生じ易くなり画面の輝度が不均一になるが、本発明のように積層一体化した光学積層体であれば、構造的に剛性を増すことができ、弛みやシワが生じ難くなり、画面の輝度を均一に維持することができ、本発明の効果をより一層享受することができるからである。
In the present optical laminate, the type, number, thickness and the like of the optical functional film (corresponding to “optical functional layer” in the claims) to be laminated can be arbitrarily selected.
In addition, if the thickness of an optical function film is as thin as 50 micrometers-500 micrometers, the effect of this invention can be enjoyed further. When each optical functional film is thin, it is easy to cause looseness and wrinkles simply by superimposing these films, and in an overheated environment, heat is more likely to cause looseness and wrinkles, resulting in uneven screen brightness. If the optical laminated body is laminated and integrated as described above, the rigidity can be increased structurally, slack and wrinkles are less likely to occur, the brightness of the screen can be maintained uniformly, and the effects of the present invention can be further enhanced. This is because it can be enjoyed.

空気空隙部を形成する光学機能フィルム間の接着部は、光が均一に拡散するように、或いは輝度が均一になるように、平面視した際に一定の規則性を持って配置するのが好ましい。
その配置構成としては、例えば碁盤目状、縞状など一定の間隔で配列するのが好ましい。また、各接着部の面積を極めて小さくして多数分散配置するようにしてもよい。
The adhesive part between the optical functional films forming the air gap is preferably arranged with a certain regularity when viewed in plan so that the light is uniformly diffused or the luminance is uniform. .
As the arrangement configuration, for example, it is preferable to arrange them at regular intervals such as a grid pattern or a stripe pattern. Further, a large number of the adhesion portions may be dispersedly arranged with an extremely small area.

空気空隙部を形成する光学機能フィルム間の接着部内部に、微細な空気部を設けて当該光学機能フィルム間の空気容量を高めるようにしてもよい。
具体的には、当該光学機能フィルム間に塗布する粘着剤乃至接着剤に発泡剤を混ぜて粘着剤乃至接着剤内で発泡させたり、固着させる直前に粘着剤乃至接着剤に空気を混入させたりして、接着部内部に微細な空気部を設けることができる。
You may make it raise the air capacity between the said optical function films by providing a fine air part inside the adhesion part between the optical function films which form an air space | gap part.
Specifically, a foaming agent is mixed with the pressure-sensitive adhesive or adhesive applied between the optical functional films and foamed in the pressure-sensitive adhesive or adhesive, or air is mixed into the pressure-sensitive adhesive or adhesive immediately before fixing. And a fine air part can be provided in an adhesion part inside.

本光学積層体において、積層する光学機能フィルムを固着するための粘着剤乃至接着剤は、特に種類を限定するものではない。例えば可視光線域の透過率が高い、ウレタン系、ポリエステル系、メタクリル系、アクリル系、EVA系、ポリアミド系、シリコーン系、エポキシ系、ゴム系の接着剤や粘着剤を用いることができる。
接着剤は、液状でもホットメルトでもよく、耐熱性および耐光性等を考慮すると、ウレタン系のドライラミ接着剤、或いは2液硬化型のポリエステル系あるいはアクリル系、エポキシ系接着剤が好ましい。粘着剤では、アクリル系、シリコーン系が好ましい。
In the present optical laminate, the type of the pressure-sensitive adhesive or adhesive for fixing the laminated optical functional film is not particularly limited. For example, urethane-based, polyester-based, methacrylic-based, acrylic-based, EVA-based, polyamide-based, silicone-based, epoxy-based, and rubber-based adhesives and pressure-sensitive adhesives having high transmittance in the visible light region can be used.
The adhesive may be liquid or hot melt, and in view of heat resistance, light resistance and the like, a urethane-based dry lamination adhesive, or a two-component curable polyester-based, acrylic-based, or epoxy-based adhesive is preferable. As the pressure-sensitive adhesive, acrylic type and silicone type are preferable.

光学機能フィルム間を部分的に接着し、当該光学機能フィルム間における接着部以外の部位を空気空隙部とする方法としては、次の(イ)〜(ホ)などの方法を例示することができる。但し、これらに限定されるものではない。   Examples of the method of partially bonding the optical functional films and using the portions other than the bonded portions between the optical functional films as the air gaps include the following methods (a) to (e). . However, it is not limited to these.

(イ)光学機能フィルムの接着面に、グラビア印刷法等でスポット状若しくは模様状に粘着剤乃至接着剤を厚みをもって塗布することにより、光学機能フィルム間を部分的に接着して該接着部以外の部位を空気空隙部とすることができる。
例えば、粘着剤乃至接着剤を、小さな点が一定間隔で配置されるように印刷したり、或いは、碁盤目状、縞状などのように一定の規則性を持った模様状に印刷したりするのが好ましい。この際、粘着剤乃至接着剤の塗布量を調整することで、空気空隙部の高さ(厚さ)を調整することができる。
(A) A part of the optical functional film is partially adhered to the adhesive surface of the optical functional film by applying a thickness of a pressure-sensitive adhesive or adhesive in a spot or pattern shape by a gravure printing method or the like. These parts can be air gaps.
For example, an adhesive or adhesive is printed so that small dots are arranged at regular intervals, or printed in a pattern with a certain regularity such as a grid pattern or a stripe pattern. Is preferred. Under the present circumstances, the height (thickness) of an air space part can be adjusted by adjusting the application quantity of an adhesive or an adhesive agent.

好ましい一例として、図3に示すように、平面状の裏面を備えた光学機能フィルム(請求項の「光学機能層」に相当)1と、多数の凸部が形成されたプリズム面を表面に備えたプリズムシート(請求項の「光学機能層」に相当)2との積層において、光学機能フィルム1の裏面に、プリズムシート2の表面に形成された凸条部の高さよりも小さな厚みとなるように粘着剤乃至接着剤を塗布して、プリズムシート2の凸条部と交差する縞模様状に接着層3を形成し、プリズムシート2の表面に形成されたプリズム面における凸条部の頂点が前記接着層3内に埋まるように、光学機能フィルム1とプリズムシート2とを積層することで、接着層3とプリズムシート2の凸条部とが交差する部分が接着部3Aとなり、残りの部分が空気空隙部4となるようにすることにより、光学機能フィルム1、プリズムシート2間を部分的に接着し、且つ該接着部以外の部位に空気空隙部4を形成することができる。   As a preferred example, as shown in FIG. 3, an optical functional film (corresponding to “optical functional layer” in the claims) 1 having a flat back surface and a prism surface on which a large number of convex portions are formed are provided on the surface. In the lamination with the prism sheet (corresponding to “optical function layer” in the claims) 2, the thickness of the back surface of the optical function film 1 is smaller than the height of the ridges formed on the surface of the prism sheet 2. The adhesive layer 3 is formed in a striped pattern intersecting with the ridges of the prism sheet 2 by applying an adhesive or an adhesive to the prism sheet 2, and the apex of the ridges on the prism surface formed on the surface of the prism sheet 2 By laminating the optical function film 1 and the prism sheet 2 so as to be buried in the adhesive layer 3, the portion where the adhesive layer 3 and the protruding portion of the prism sheet 2 intersect becomes the adhesive portion 3A, and the remaining portion Becomes air gap 4 By way can optically functional film 1 was bonded between the prism sheet 2 partially, and a part other than the adhesive portion to form an air gap portion 4.

(ロ)光学機能フィルムの接着面に粘着剤乃至接着剤を部分的に厚みをもって塗布しておき、この塗布部分を熱でスポット融着することにより、光学機能フィルム間を部分的に接着して該接着部以外の部位を空気空隙部とすることができる。 (B) A pressure-sensitive adhesive or adhesive is partially applied to the adhesive surface of the optical functional film with a thickness, and the applied part is spot-bonded by heat to partially bond the optical functional film. Sites other than the bonded portion can be air gaps.

(ハ)図2に示すように、平面状の裏面を備えた光学機能フィルム(請求項の「光学機能層」に相当)1と、多数の凸部が形成されたプリズム面を表面に備えたプリズムシート(請求項の「光学機能層」に相当)2との積層において、プリズムシート2の表面に形成された凸部の高さよりも小さな厚みとなるように、光学機能フィルム1の裏面全面に粘着剤乃至接着剤を塗布して接着層3を形成し、プリズムシート2の表面に形成されたプリズム面における凸部の頂点が前記接着層3内に埋まるように、光学機能フィルム1とプリズムシート2とを積層することで、凸部間に空気空隙部4を残すことができ、光学機能フィルム1、プリズムシート2間を部分的に接着し、且つ該接着部以外の部位に空気空隙部4を形成することができる。 (C) As shown in FIG. 2, an optical functional film (corresponding to the “optical functional layer” in the claims) 1 having a flat back surface and a prism surface on which a large number of convex portions are formed are provided on the surface. In the lamination with the prism sheet (corresponding to “optical function layer” in the claims) 2, the entire back surface of the optical function film 1 has a thickness smaller than the height of the convex portion formed on the surface of the prism sheet 2. The optical functional film 1 and the prism sheet are formed such that the adhesive layer 3 is formed by applying an adhesive or an adhesive, and the apex of the convex portion on the prism surface formed on the surface of the prism sheet 2 is embedded in the adhesive layer 3. 2, the air gap portion 4 can be left between the convex portions, the optical functional film 1 and the prism sheet 2 are partially adhered, and the air gap portion 4 is provided at a portion other than the adhesion portion. Can be formed.

この場合、図4に示すように、光学機能フィルム1が出射光側(光源5の反対側)、すなわち、プリズムシート2のプリズム面が出射光側に位置するように配置するのが好ましい。このように配置すれば、プリズムシート2のプリズム面の出射光側に空気空隙部4が存在するから、プリズム面と空気空隙部4との界面によるプリズム効果をより効果的に享受することができる。したがって、光源(導光板)5からプリズムシート2に入射した光は、プリズム面と空気空隙部4との界面に到達してプリズム効果を受け、一部の光は光源5側に全反射して再利用光となり、残りの光の多くが、所定の方向に屈折されて光学機能フィルム1に供給され、偏光板乃至偏光フィルムを通過する光の量を増大させることができるから、光源(導光板)5からプリズムシート2に供給される光を効率的に液晶セルに供給できるようになり、その結果、液晶ディスプレイの輝度をより向上させることができる。   In this case, as shown in FIG. 4, it is preferable that the optical functional film 1 be disposed so that the outgoing light side (opposite the light source 5), that is, the prism surface of the prism sheet 2 is located on the outgoing light side. With this arrangement, since the air gap 4 is present on the outgoing light side of the prism surface of the prism sheet 2, the prism effect due to the interface between the prism surface and the air gap 4 can be more effectively enjoyed. . Therefore, the light incident on the prism sheet 2 from the light source (light guide plate) 5 reaches the interface between the prism surface and the air gap 4 and receives the prism effect, and part of the light is totally reflected on the light source 5 side. Since it becomes reusable light, most of the remaining light is refracted in a predetermined direction and supplied to the optical functional film 1, and the amount of light passing through the polarizing plate or polarizing film can be increased. ) The light supplied from 5 to the prism sheet 2 can be efficiently supplied to the liquid crystal cell, and as a result, the luminance of the liquid crystal display can be further improved.

他方、図5に示すように、光学機能フィルム1が光源側、すなわち、プリズムシート2のプリズム面が光源側に位置するように配置することもできる。ただし、このように配置した場合、プリズムシート2のプリズム面で光が拡散するため、所望のプリズム効果を享受し難いという課題がある。   On the other hand, as shown in FIG. 5, the optical functional film 1 can be arranged so that the prism surface of the prism sheet 2 is located on the light source side, that is, the light source side. However, when arranged in this way, light diffuses on the prism surface of the prism sheet 2, so that there is a problem that it is difficult to enjoy a desired prism effect.

なお、上記のプリズム面は、山形凸条部が並設された面であっても、多角錐部が並設された面であってもよく、各凸部の高さは同じであっても、図1及び図2に示すように、異なるものであってもよい。   The prism surface described above may be a surface on which angle-shaped ridges are arranged side by side or a surface on which polygonal pyramid portions are arranged in parallel, and the height of each projection may be the same. As shown in FIGS. 1 and 2, they may be different.

また、図6に示すように、上記の光学機能フィルム1がプリズムシートであってもよい。すなわち、多数の凸部が形成されたプリズム面を表面に備え、且つ平面状の裏面を備えた光学機能層を用いることもでき、プリズムシートとプリズムシートとを積層するようにしてもよい。
この際、図6に示すように、上面視した際に、光学機能フィルム1、プリズムシート2におけるプリズム面の山形凸条の長さ方向が互いに交差するように配置するのが好ましい。このように配置することにより、出射する光、すなわち偏光板乃至液晶セル側に供給する光をより一層均一化することができる。
Further, as shown in FIG. 6, the optical functional film 1 may be a prism sheet. That is, an optical functional layer having a prism surface with a large number of convex portions on the surface and a flat back surface may be used, and the prism sheet and the prism sheet may be laminated.
At this time, as shown in FIG. 6, it is preferable that the optical function film 1 and the prism sheet 2 in the prism sheet 2 are arranged so that the length directions of the ridges on the prism surface intersect each other when viewed from above. By arranging in this way, the emitted light, that is, the light supplied to the polarizing plate or the liquid crystal cell side can be made more uniform.

なお、上記の構成において、光学機能フィルム1の裏面に塗布する粘着剤乃至接着剤の量を少なくするか、或いはプリズム面における凸部の頂点を接着層に埋め込む深さを浅くすることにより、空気空隙部4の容量を増やすことができるが、同時に接着力が低下するため、両者のバランスを考慮する必要がある。よって、輝度向上と接着力とのバランスの観点から、空気空隙部4を形成する光学機能フィルム間において、接着部3と空気空隙部4の面積(平面視した場合の面積を示す)の比率は、接着部:空隙部=1:3〜1:9とするのが好ましい。
また、空気空隙部4の高さ(厚さ)は、必要な光学特性に応じて適宜調整するのが好ましいが、目安として2μm〜50μmを例示することができる。
In the above configuration, the amount of the pressure-sensitive adhesive or adhesive applied to the back surface of the optical functional film 1 is reduced, or the depth at which the apex of the convex portion on the prism surface is embedded in the adhesive layer is reduced. Although the capacity | capacitance of the space | gap part 4 can be increased, since adhesive force falls simultaneously, it is necessary to consider both balance. Therefore, from the viewpoint of the balance between brightness improvement and adhesive force, the ratio of the area of the adhesive part 3 and the air gap part 4 (showing the area in plan view) between the optical functional films forming the air gap part 4 is Adhesive portion: void portion = 1: 3 to 1: 9 is preferable.
Moreover, although it is preferable to adjust suitably the height (thickness) of the air space part 4 according to a required optical characteristic, 2 micrometers-50 micrometers can be illustrated as a standard.

(ニ)粘着剤乃至接着剤から不織布状の接着シートを形成しておき、これを光学機能フィルム間に挟んで接着することにより、光学機能フィルム間を部分的に接着し、該接着部以外の部位を空気空隙部とすることができる。 (D) A non-woven adhesive sheet is formed from a pressure-sensitive adhesive or an adhesive, and this is sandwiched between and bonded to the optical functional film to partially bond the optical functional film, A site | part can be made into an air space | gap part.

(ホ)光学機能フィルムの接着面に、粘着剤乃至接着剤をスプレー塗布することにより、該接着面に粘着剤乃至接着剤を分散塗布することができるから、光学機能フィルム間を部分的に接着させ、該接着部以外の部位を空気空隙部とすることができる。
この場合、スプレー塗布する際のノズル径、圧力、ノズル先端と接着面との距離などを調整することによって、各接着部の大きさや間隔などを調整することができる。
(E) By spraying a pressure-sensitive adhesive or adhesive onto the adhesive surface of the optical functional film, the pressure-sensitive adhesive or adhesive can be dispersed and applied to the adhesive surface, so that the optical functional films are partially bonded. Thus, a portion other than the bonding portion can be used as an air gap portion.
In this case, by adjusting the nozzle diameter and pressure at the time of spray application, the distance between the nozzle tip and the bonding surface, the size and interval of each bonding portion can be adjusted.

(実施例1)
一体化するための光学機能層として、反射型偏光シート(住友スリーエム社製:ビキュイティDBEF−D)1と、プリズムシート(住友スリーエム社製:ビキュイティBEFIII)2とを用いた。
なお、プリズムシート2は、図1に示すように、ポリエステルフィルム2A上に、山形凸条部が並設されてなるアクリル樹脂製のプリズム面層2Bが積層されたものであり、プリズム面における凸部高さは30μm〜40μmである。
(Example 1)
A reflective polarizing sheet (Sumitomo 3M: Vicuity DBEF-D) 1 and a prism sheet (Sumitomo 3M: Vicuity BEFIII) 2 were used as an optical functional layer for integration.
In addition, as shown in FIG. 1, the prism sheet 2 is obtained by laminating a prism surface layer 2B made of acrylic resin in which angle-shaped ridges are arranged side by side on a polyester film 2A. The part height is 30 μm to 40 μm.

図4に示すように、反射型偏光シート1の裏面、すなわち光源側に配される面に、ドライラミネート型接着剤をドライ厚さで5μmとなるように全面に塗布して乾燥させて接着層3を形成し、プリズムシート2の凸条部の頂点が接着層3内に埋まるように、光源側からプリズムシート2を重ねて接着し、プリズムシート2における凸条部間に空気空隙部4を残すように光学機能層一体化品(サンプル)を形成した。   As shown in FIG. 4, on the back surface of the reflective polarizing sheet 1, that is, the surface disposed on the light source side, a dry laminate adhesive is applied over the entire surface so as to have a dry thickness of 5 μm and dried to form an adhesive layer. 3, the prism sheet 2 is overlapped and bonded from the light source side so that the apex of the protruding portion of the prism sheet 2 is embedded in the adhesive layer 3, and the air gap 4 is formed between the protruding portions of the prism sheet 2. An optical functional layer integrated product (sample) was formed so as to remain.

なお、本実施例で用いたドライラミネート型接着剤は、東洋モートン社製のウレタン系ドライラミネート用接着剤(「TM−K51」)と、硬化剤「CAT−RT85」とを100:15の質量比率で混合したものを用い、これを適宜溶剤で希釈してグラビアコーターで塗布した。   The dry laminate type adhesive used in this example was a urethane dry laminate adhesive (“TM-K51”) manufactured by Toyo Morton and a curing agent “CAT-RT85” in a mass of 100: 15. What was mixed by the ratio was used, this was diluted suitably with the solvent, and it apply | coated with the gravure coater.

(実施例2)
実施例1で使用した反射型偏光シート1の裏面、すなわち光源側に配される面に、EVA系熱可塑性接着剤を厚さが10μmとなるように全面に溶融塗布し、プリズムシート2の凸条部の頂点が接着層3内に埋まるように、光源側からプリズムシート2を重ねて加熱融着し、プリズムシート2における凸条部間に空気空隙部4を残すように光学機能層一体化品(サンプル)を形成した。
(Example 2)
An EVA thermoplastic adhesive was melt-applied over the entire surface of the reflective polarizing sheet 1 used in Example 1 so as to have a thickness of 10 μm on the rear surface, that is, the surface disposed on the light source side. The optical function layer is integrated so that the prism sheet 2 is overlapped and heat-sealed from the light source side so that the top of the strip is embedded in the adhesive layer 3, and the air gap 4 is left between the convex strips of the prism sheet 2. An article (sample) was formed.

(比較例1)
実施例1と同様の材料を用いて、反射型偏光シート1とプリズムシート2とを、通常のように、すなわち接着剤を介さずに単に重ねて光学機能層一体化品(サンプル)を得た。
(Comparative Example 1)
Using the same material as in Example 1, the reflective polarizing sheet 1 and the prism sheet 2 were simply overlapped as usual, that is, without an adhesive, to obtain an optical functional layer integrated product (sample). .

(比較例2)
実施例1で使用した反射型偏光シート1の裏面、すなわち光源側に配される面に、実施例2と同様のEVA系熱可塑性接着剤を、厚さが200μmとなるように全面に溶融塗布し、プリズムシート2の凸部間が完全に埋まるように加熱融着して光学機能層一体化品(サンプル)を得た。
(Comparative Example 2)
The EVA thermoplastic adhesive similar to that in Example 2 is melt-coated on the entire surface so that the thickness is 200 μm on the back surface of the reflective polarizing sheet 1 used in Example 1, that is, the surface disposed on the light source side. And it heat-sealed so that the convex part of the prism sheet 2 might be filled completely, and the optical function layer integrated product (sample) was obtained.

<輝度評価>
実施例1及び2、比較例1及び2で得た光学機能層一体化品(サンプル)を、図7に示すように、液晶バックライトユニット積層体を模した構成で配置して輝度測定した。この際、反射型偏光シート1がプリズムシート2よりも出射光側に位置するように光学機能層一体化品(サンプル)を配置した。
<Luminance evaluation>
The optical function layer integrated product (sample) obtained in Examples 1 and 2 and Comparative Examples 1 and 2 was arranged in a configuration simulating a liquid crystal backlight unit laminate as shown in FIG. At this time, the optical functional layer integrated product (sample) was arranged so that the reflective polarizing sheet 1 was positioned on the outgoing light side with respect to the prism sheet 2.

すなわち、積層体の配置順序は、光源ボックス(CCFL)側から、厚さ2mmの光拡散板(住友化学社製:スミペックスRM402)、光学機能層一体化品(サンプル)、液晶セル後面偏光板(日東電工社製:NPFSEG1224)を順次に重ねて積層体とした。
このように重ねた積層体を、図7に示すように、箱型の測定枠を作製し、枠上部に前記積層体を積載し、下面より冷陰極管(CCFL)光源(外径1.8mm、長さ91mm、電源5V)2本を点灯させ、積層体を透過する光を、HI−LAND’s RISA system社製の輝度計を用いて正面輝度を測定した。
そして、比較例1の正面輝度を100%とした場合の相対比率を輝度向上率(%)として算出し、90%以上であれば「○」、90%未満であれば「×」と評価した。結果を表1に示す。
That is, the arrangement order of the laminated body is as follows: from the light source box (CCFL) side, a 2 mm-thick light diffusion plate (Sumitomo Chemical Co., Ltd .: Sumipex RM402), an optical functional layer integrated product (sample), a liquid crystal cell rear polarizing plate ( Nitto Denko Co., Ltd.:NPFSEG1224) was sequentially stacked to form a laminate.
As shown in FIG. 7, the stacked body thus obtained is manufactured into a box-shaped measuring frame, the stacked body is mounted on the upper part of the frame, and a cold cathode tube (CCFL) light source (outer diameter 1.8 mm) is formed from the lower surface. Two light sources were turned on, and the front luminance of the light transmitted through the laminate was measured using a luminance meter manufactured by HI-LAND's RISA system.
Then, the relative ratio when the front luminance of Comparative Example 1 was set to 100% was calculated as a luminance improvement rate (%), and was evaluated as “◯” when 90% or more, and “X” when less than 90%. . The results are shown in Table 1.

<弛み評価>
アルミニウム製の枠体の各辺2箇所、合計8箇所に、500mm×800mmの光学機能層一体化品(サンプル)をピンで固定し、この状態で85℃のギアオーブンに30分加熱し、取り出した時のサンプルを肉眼で観察した。
この際、サンプルに弛みが認められなかったものは「○」、認められたものは「×」と評価した。
<Looseness evaluation>
An optical functional layer integrated product (sample) of 500 mm x 800 mm is fixed with a pin at two places on each side of the aluminum frame, for a total of eight places, and in this state, heated in a gear oven at 85 ° C for 30 minutes and taken out The sample was observed with the naked eye.
At this time, the sample in which no slack was observed was evaluated as “◯”, and the sample in which slack was observed was evaluated as “×”.

Figure 2008176206
Figure 2008176206

表1の結果から明らかなように、実施例1及び2で得られた光学機能層一体化品を用いた場合、筐体内部で光学機能層が弛むことがないことが確認された。また、実施例1及び2は、従来の通常品である比較例1の輝度を維持することができることも確認された。
比較例1のものは弛みが発生するなど、従来から指摘されていた問題を生じた。
As is clear from the results in Table 1, it was confirmed that when the optical functional layer integrated product obtained in Examples 1 and 2 was used, the optical functional layer was not loosened inside the housing. Moreover, it was also confirmed that Example 1 and 2 can maintain the brightness | luminance of the comparative example 1 which is a conventional normal product.
The thing of the comparative example 1 produced the problem pointed out conventionally, such as generating looseness.

本発明を構成する光学機能層の好ましい一例として、プリズムシートの一例を示した要部部分断面斜視図である。FIG. 3 is a partial cross-sectional perspective view showing a main part of an example of a prism sheet as a preferred example of an optical functional layer constituting the present invention. 本発明の一例として、光学機能層一体化品(液晶バックライト用光学積層体)の一例を示した要部断面図である。It is principal part sectional drawing which showed an example of the optical function layer integrated product (optical laminated body for liquid crystal backlights) as an example of this invention. 本発明の一例として、光学機能層一体化品(液晶バックライト用光学積層体)の一例を示した図であり、(A)は分解状態を示す部分断面斜視図であり、(B)は、接着層及び接着部が断面に現れるように切断した横断面図である。As an example of the present invention, it is a diagram showing an example of an optical functional layer integrated product (optical laminate for liquid crystal backlight), (A) is a partial cross-sectional perspective view showing an exploded state, (B), It is the cross-sectional view cut | disconnected so that the contact bonding layer and the adhesion part may appear in a cross section. 本発明の一例として、光学機能層一体化品の配置例を示した要部断面図である。It is principal part sectional drawing which showed the example of arrangement | positioning of an optical function layer integrated product as an example of this invention. 本発明の一例として、図4とは異なる配置例の光学機能層一体化品を示した要部断面図である。FIG. 5 is a cross-sectional view of a main part showing an optical functional layer integrated product having an arrangement example different from FIG. 4 as an example of the present invention. 本発明の一例として、光学機能層一体化品(液晶バックライト用光学積層体)の一例を分離状態で示した部分断面斜視図である。It is the fragmentary sectional perspective view which showed an example of the optical function layer integrated product (optical laminated body for liquid crystal backlights) in the isolation | separation state as an example of this invention. 実施例及比較例で得た光学機能層一体化品を評価するための試験方法を示した斜視図である。It is the perspective view which showed the test method for evaluating the optical function layer integrated product obtained in the Example and the comparative example.

符号の説明Explanation of symbols

1 反射型偏光シート
2 プリズムシート
2A ポリエステルフィルム
2B プリズム面層
3 接着層
3A 接着部
4 空気空隙部
5 光源
DESCRIPTION OF SYMBOLS 1 Reflective type polarization sheet 2 Prism sheet 2A Polyester film 2B Prism surface layer 3 Adhesion layer 3A Adhesion part 4 Air space part 5 Light source

Claims (1)

複数の光学機能層を粘着剤乃至接着剤で固着し積層一体化してなるディスプレイパネル用光学積層体であって、少なくとも2層の光学機能層間を部分的に接着し、該光学機能層間における接着部以外の部位を空気空隙部としてなる構成を備えたディスプレイパネル用光学積層体。
An optical laminate for a display panel, in which a plurality of optical functional layers are fixed and integrated with a pressure-sensitive adhesive or adhesive, and at least two optical functional layers are partially bonded, and an adhesive portion between the optical functional layers An optical laminate for a display panel having a configuration in which a portion other than the air gap is used.
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JP2018106196A (en) * 2010-04-12 2018-07-05 スリーエム イノベイティブ プロパティズ カンパニー Optical laminate
JP2012118235A (en) * 2010-11-30 2012-06-21 Dainippon Printing Co Ltd Optical member, optical module, liquid crystal display panel and display device
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