JPH08194217A - Visual field enlarging film and its production - Google Patents
Visual field enlarging film and its productionInfo
- Publication number
- JPH08194217A JPH08194217A JP7005554A JP555495A JPH08194217A JP H08194217 A JPH08194217 A JP H08194217A JP 7005554 A JP7005554 A JP 7005554A JP 555495 A JP555495 A JP 555495A JP H08194217 A JPH08194217 A JP H08194217A
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- JP
- Japan
- Prior art keywords
- light
- film
- visual field
- view
- base body
- 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.)
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Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、視野拡大効果を有する
視野拡大フィルムおよびその製造方法に関し、特に、液
晶ディスプレイ内の液晶表示パネルに用いられる視野拡
大フィルム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 visual field expanding film having a visual field expanding effect and a method for manufacturing the same, and more particularly to a visual field expanding film used for a liquid crystal display panel in a liquid crystal display and a method for manufacturing the same.
【０００２】[0002]
【従来の技術】従来、液晶表示パネルに使用される視野
拡大フィルムは、以下に述べるものが知られている。 （１）断面形状が蒲鉾型の非球面形状または円形状で一
方向に連続した凸部が、規則正しく平行または同心円あ
るいはスパイラル状に整列したレンチキュラーレンズよ
りなるもの。2. Description of the Related Art Conventionally, the following visual field expansion films have been known for use in liquid crystal display panels. (1) A lenticular lens whose cross-sectional shape is an aspherical shape having a semi-cylindrical shape or a circular shape, and convex portions which are continuous in one direction are regularly arranged in parallel, concentric circles or spirals.
【０００３】（２）連続して形成された凹レンズよりな
るもので、たとえば特開昭５３−２５３９９号公報、特
開昭５８−１６９１３２号公報および特開平２−１０８
０９３号公報に開示されている。 （３）凸レンズ単体が複数集合してなり、全方向に光を
拡大するもの、および蒲鉾状に一方向の断面が曲面を呈
し、山脈状に連続して一方向のみに光を拡大するもの
で、たとえば特開平６−２７４５３号公報に開示されて
いる。(2) A concave lens formed continuously, which is disclosed in, for example, JP-A-53-25399, JP-A-58-169132 and JP-A-2-108.
093. (3) A single convex lens that expands light in all directions, and a semi-cylindrical shape with a curved cross section in one direction that continuously expands light in only one direction in a mountain range. For example, it is disclosed in JP-A-6-27453.
【０００４】（４）ルーバー等の光制御部とマイクロレ
ンズアレイとを用いたもの。 （５）レンチキュラーレンズおよびマイクロルーバーを
用いて、一方向の光のみを拡散するもので、たとえば特
開昭６０−２０２４６４号公報に開示されている。 （６）平行状または格子状あるいはハニカム構造のルー
バーを用いたもので、たとえば特開昭６２−５６９３０
号公報に開示されている。(4) A light control unit such as a louver and a microlens array are used. (5) A lenticular lens and a microlouver are used to diffuse light in only one direction, which is disclosed in, for example, Japanese Patent Laid-Open No. 60-202464. (6) A louver having a parallel shape, a lattice shape, or a honeycomb structure is used, for example, JP-A-62-56930.
No. 6,086,045.
【０００５】前述した視野拡大フィルムの製造方法とし
ては、図９に示すように、先ず、基材１上に感光性樹脂
２を形成した（図９（ａ）参照）後、感光性樹脂２上に
フォトマスク３、光を散乱させる光散乱シート４を順次
配置する。その後、光散乱シート４を通して光源５より
光を照射し、フォトマスク３をマスクとして、感光性樹
脂２を選択的に露光する。このとき、感光性樹脂２とフ
ォトマスク３との距離６を変化させ、感光性樹脂２に照
射する光の強度を変更する（図９（ｂ）参照）。その
後、感光性樹脂２を現像して、断面形状が台形波状や正
弦波状の視野拡大フィルムを形成する（図９（ｃ）参
照）もので、たとえば特開昭６４−４９００１号公報に
開示されている。As a method for manufacturing the above-mentioned field-of-view magnifying film, as shown in FIG. 9, first, a photosensitive resin 2 is formed on a substrate 1 (see FIG. 9A), and then on the photosensitive resin 2. Then, a photomask 3 and a light scattering sheet 4 for scattering light are sequentially arranged. After that, light is emitted from the light source 5 through the light scattering sheet 4, and the photosensitive resin 2 is selectively exposed using the photomask 3 as a mask. At this time, the distance 6 between the photosensitive resin 2 and the photomask 3 is changed to change the intensity of light applied to the photosensitive resin 2 (see FIG. 9B). Then, the photosensitive resin 2 is developed to form a field-enlarging film having a trapezoidal or sinusoidal cross section (see FIG. 9C), which is disclosed in, for example, JP-A-64-49001. There is.
【０００６】[0006]
【発明が解決しようとする課題】ところが、前述した視
野拡大フィルムおよびその製造方法においては、次のよ
うな問題点があることが本発明者により見い出された。
すなわち、視野拡大フィルムにレンチキュラーレンズや
マイクロレンズアレイを用いたものは、レンズ部が連続
していることから、入射した光は全方向に均等に拡散す
るため、平行光線透過率が著しく減少し、液晶ディスプ
レイの画面正面の画像が薄暗く非常に見にくくなる。However, the present inventor has found that the above-described field-of-view magnifying film and its manufacturing method have the following problems.
That is, in the case of using a lenticular lens or a microlens array for the field-of-view magnifying film, since the lens part is continuous, the incident light is diffused uniformly in all directions, so the parallel light transmittance is significantly reduced, The image in front of the LCD screen is dim and difficult to see.
【０００７】視野拡大フィルムに凹レンズあるいは凸レ
ンズを用いた場合も、平行光線透過率が著しく減少し、
液晶ディスプレイの画像が薄暗くなる。特に、単体レン
ズの集合体状に形成されている場合は、全方向に拡散し
てしまうため、液晶ディスプレイの正面への透過光量は
さらに低下してしまう。また、視野拡大フィルムにルー
バーを用いたものは、液晶ディスプレイの正面輝度が上
がると、ルーバーの内壁（フィン）はミラーではなく黒
色体であるため、フィンに進入した光は吸収される。従
って、液晶ディスプレイの正面の輝度が向上することは
なく、平行光線透過率は低下する。さらに、レンズに進
入する光線が制限されているため、視野角度が限定され
る。When a concave lens or a convex lens is used for the field-of-view magnifying film, the parallel light ray transmittance is remarkably reduced,
The image on the LCD display becomes dim. In particular, when the single lens is formed as an aggregate, it diffuses in all directions, so that the amount of light transmitted to the front of the liquid crystal display further decreases. Further, in the case where the louver is used as the field-of-view magnifying film, when the front brightness of the liquid crystal display increases, the inner wall (fin) of the louver is not a mirror but a black body, so that the light entering the fin is absorbed. Therefore, the brightness in front of the liquid crystal display is not improved and the parallel light transmittance is reduced. Furthermore, the viewing angle is limited because the rays that enter the lens are limited.
【０００８】本発明の目的は、前述した問題点に鑑み、
平行光線透過率を低下させることなく、視野を拡大する
ことができる視野拡大フィルムおよびその製造方法を提
供することにある。本発明の前記ならびにその他の目的
と新規な特徴は、本明細書の記述および添付図面から明
らかになるであろう。The object of the present invention is to solve the above-mentioned problems.
It is an object of the present invention to provide a field-of-view magnifying film capable of enlarging the field of view without lowering the parallel light transmittance and a method for producing the same. The above and other objects and novel features of the present invention will be apparent from the description of the present specification and the accompanying drawings.
【０００９】[0009]
【課題を解決するための手段】本願において開示される
発明のうち、代表的なものの概要を簡単に説明すれば、
以下のとおりである。 （１）本発明の視野拡大フィルムは、基材上に最上部が
平坦な複数の凸部が等間隔に形成され、前記基材の表面
と前記凸部の最上部とを結ぶ斜面の一部または全部が所
定の角度を有するものである。Of the inventions disclosed in the present application, a representative one will be briefly described below.
It is as follows. (1) In the visual field widening film of the present invention, a plurality of convex portions having a flat uppermost portion are formed on a base material at equal intervals, and a part of a slope connecting the surface of the base material and the uppermost portion of the convex portion. Alternatively, all have a predetermined angle.
【００１０】（２）本発明の視野拡大フィルムは、基材
上に円弧または楕円あるいは複数の曲率半径により構成
された曲線からなる複数の凹部または凸部を等間隔に形
成したものである。 （３）本発明の視野拡大フィルムは、手段（１）または
（２）において、フィルム面内方向の光の複屈折位相差
を１０ｎｍ以下にしたものである。(2) The field-of-view magnifying film of the present invention comprises a base material having a plurality of concave portions or convex portions formed at regular intervals and each having an arc or an ellipse or a curve constituted by a plurality of radii of curvature. (3) The visual field widening film of the present invention has the birefringence phase difference of light in the in-plane direction of the film set to 10 nm or less in the means (1) or (2).
【００１１】（４）本発明の視野拡大フィルムの製造方
法は、基材上に感光性樹脂、フォトマスクを順次形成
し、前記フォトマスク上に光線の方向を任意に変更でき
る集光シートを形成した後、前記集光シートを通して光
を照射し、前記フォトマスクをマスクとして、前記感光
性樹脂を選択的に露光し、現像するものである。(4) In the method for producing a field-of-view magnifying film of the present invention, a photosensitive resin and a photomask are sequentially formed on a substrate, and a light-condensing sheet capable of arbitrarily changing the direction of light rays is formed on the photomask. After that, light is irradiated through the light-condensing sheet, and the photosensitive resin is selectively exposed and developed using the photomask as a mask.
【００１２】[0012]
【作 用】前述した手段によれば、基材上に光拡大部と
平坦部とを交互に形成したので、平坦部では光線が曲が
ることなく、正面に透過すると共に、光拡大部では視野
拡大効果を有する。また、前述した手段によれば、フィ
ルム面内方向の光の複屈折位相差を１０ｎｍ以下にした
ので、光学的な歪みが生じない。[Operation] According to the above-mentioned means, since the light expanding portion and the flat portion are alternately formed on the base material, the light ray is not bent in the flat portion and is transmitted to the front side, and the field of view is enlarged in the light expanding portion. Have an effect. Further, according to the means described above, the birefringence phase difference of light in the in-plane direction of the film is set to 10 nm or less, so that optical distortion does not occur.
【００１３】さらに、前述した手段によれば、集光シー
トを通して光を照射し、感光性樹脂を選択的に露光する
ので、光が所望の方向に容易に照射され、感光性樹脂に
所望の強度分布を有する光線が入射される。Further, according to the above-mentioned means, the light is irradiated through the light-condensing sheet to selectively expose the photosensitive resin, so that the light is easily irradiated in the desired direction and the desired intensity is applied to the photosensitive resin. A ray having a distribution is incident.
【００１４】[0014]
【実施例】以下、本発明の実施例を図面に基づいて詳細
に説明する。なお、実施例を説明するための全図におい
て同一の機能を有するものは同一の符号を付け、その繰
り返しの説明は省略する。 〔実施例１〕図１は本発明の第１実施例である視野拡大
フィルムの製造方法を説明する工程断面図、図２は本発
明の第１実施例である視野拡大フィルムの断面図、図３
は本発明の第１実施例である視野拡大フィルムを実装し
た液晶表示装置の概略説明図である。Embodiments of the present invention will now be described in detail with reference to the drawings. In all the drawings for explaining the embodiments, those having the same function are designated by the same reference numerals, and the repeated description thereof will be omitted. [Embodiment 1] FIG. 1 is a process sectional view for explaining a method for manufacturing a visual field expanding film which is a first embodiment of the present invention, and FIG. 2 is a sectional view of a visual field expanding film which is a first embodiment of the present invention. Three
FIG. 3 is a schematic explanatory view of a liquid crystal display device on which the field-of-view expanding film according to the first embodiment of the present invention is mounted.
【００１５】溶剤キャスト法または１５０°Ｃで１０分
間加熱して応力を除去して形成した１００μｍ厚の基
材、たとえばポリカーボネート樹脂７上に、感光性樹
脂、たとえば紫外線硬化樹脂８を８０μｍ厚塗布し、さ
らにその上に、ラミネート層９を形成する。続いて、前
記ラミネート層９上に２５μｍ幅の開放部分と黒色部分
とが連続的に形成された５０μｍピッチのフォトマスク
１０を形成し、このフォトマスク１０上に光線の方向を
任意に変更できる、たとえばエステナウェーブ（積水化
学工業（株））またはプリズムシート等の集光シート１
１を積層する。A photosensitive resin, for example, an ultraviolet curable resin 8 is applied to a thickness of 80 μm on a substrate of 100 μm in thickness, for example, a polycarbonate resin 7 formed by removing the stress by solvent casting or heating at 150 ° C. for 10 minutes. Further, the laminate layer 9 is formed thereon. Subsequently, a photomask 10 having a pitch of 50 μm, in which an open portion having a width of 25 μm and a black portion are continuously formed, is formed on the laminate layer 9, and the direction of light rays can be arbitrarily changed on the photomask 10. For example, Estena Wave (Sekisui Chemical Co., Ltd.) or light-condensing sheet 1 such as a prism sheet
1 is laminated.
【００１６】その後、紫外線照射装置（超高圧水銀灯）
の光源１２より集光シート１１を通して３００ｍＪ／ｃ
ｍ2 の紫外線を３０秒間照射し、フォトマスク１０によ
り紫外線硬化樹脂８を選択的に露光する（図１（ａ）参
照）。次に、紫外線硬化樹脂８をアルカリ溶液を用いて
２分間現像した後、１００ｍＪ／ｃｍ2 の紫外線で２０
秒間再露光して、未反応部分を硬化させ、形状を固定し
た（図１（ｂ）参照）。After that, an ultraviolet irradiation device (super high pressure mercury lamp)
300 mJ / c from the light source 12 through the condensing sheet 11
Ultraviolet light of m 2 is irradiated for 30 seconds, and the ultraviolet curable resin 8 is selectively exposed by the photomask 10 (see FIG. 1A). Next, the UV curable resin 8 was developed with an alkaline solution for 2 minutes and then exposed to 100 mJ / cm 2 of UV light for 20 minutes.
Re-exposure was performed for 2 seconds to cure the unreacted portion and fix the shape (see FIG. 1 (b)).
【００１７】現像後の形状は、図２に示すように、断面
形状が上面平坦部Ｌ1 が２０μｍ、下面平坦部Ｌ2 が２
０μｍ、斜面の傾斜角θが２０°、高さＨが２０μｍの
平行に連続した台形形状を有する視野拡大フィルム（シ
ートを含む）１３が得られた。この視野拡大フィルム１
３を、図３に示すように、ＴＦＴ−ＬＣＤの観察者側の
偏光素子１４と液晶セル１５との間に取付けた。また、
視野拡大フィルム１３は台形状の凸部の長手方向が画面
左右方向に向くように設置した。従って、視野の拡大は
画面上下方向に行なわれる。As shown in FIG. 2, the shape after development has a cross-sectional shape of 20 μm in the upper flat portion L 1 and 2 in the lower flat portion L 2.
A field-enlarging film (including a sheet) 13 having a trapezoidal shape of 0 μm, a slope angle θ of 20 °, and a height H of 20 μm was obtained in parallel. This field of view expansion film 1
3 was attached between the polarizing element 14 on the viewer side of the TFT-LCD and the liquid crystal cell 15, as shown in FIG. Also,
The field-of-view magnifying film 13 was installed such that the longitudinal direction of the trapezoidal convex portions was oriented in the horizontal direction of the screen. Therefore, the field of view is enlarged in the vertical direction of the screen.
【００１８】また、台形形状が付与された賦形面側が液
晶セル１５側に向くように設置した。表示素子は、市販
のＴＦＴ−ＬＣＤテレビ、６Ｅ−Ｃ３（シャープ製）を
使用した。なお、１６は導光シートである。この状態で
画面を観察したところ次表１のような結果が得られた。Further, the trapezoidal shape-imparted surface was placed so as to face the liquid crystal cell 15 side. As the display element, a commercially available TFT-LCD TV, 6E-C3 (manufactured by Sharp) was used. In addition, 16 is a light guide sheet. When the screen was observed in this state, the results shown in Table 1 below were obtained.
【００１９】[0019]
【表１】 [Table 1]
【００２０】フィルムを実装しない従来品に比べ、透過
率は低下しているが、実使用には支障はない。視野角に
ついては従来品に比べ著しく向上し、ディスプレイをほ
とんど真下からみても階調反転（色が逆転する現象）は
起こらず、良好な画質が得られた。また、正面からみた
ときの色ズレ等も起こらなかった。視野拡大フィルム１
３を使用したことで、表示素子の視野角を著しく向上さ
せることができた。Although the transmittance is lower than that of the conventional product in which the film is not mounted, there is no problem in actual use. The viewing angle was significantly improved compared to the conventional product, and even when the display was viewed from directly below, gradation inversion (a phenomenon in which the colors were reversed) did not occur, and good image quality was obtained. In addition, there was no color shift when viewed from the front. Field-of-view expansion film 1
By using 3, it was possible to significantly improve the viewing angle of the display device.
【００２１】また、視野拡大フィルム１３をＴＦＴ−Ｌ
ＣＤの観察者側の偏光素子１４の液晶セル１５側（内
側）に取付けたので、対擦傷性や無反射処理等の表面処
理が必要なくなり、コストを低下することができると共
に、信頼性を向上することができる。さらに、文字が二
重にみえる等の文字ボケを防止することができる。ま
た、視野拡大フィルム１３の面内方向の光の複屈折位相
差を１０ｎｍ以下にすることにより、光学的な歪みを防
止することができ、液晶表示装置への視野拡大フィルム
１３の搭載が容易になる。Further, the field-of-view expansion film 13 is used as a TFT-L.
Since it is attached to the liquid crystal cell 15 side (inside) of the polarizing element 14 on the observer side of the CD, surface treatment such as scratch resistance and anti-reflection treatment is not required, and the cost can be reduced and the reliability is improved. can do. Further, it is possible to prevent a character from being blurred such that the character appears double. Further, by setting the birefringence phase difference of light in the in-plane direction of the field-of-view magnifying film 13 to 10 nm or less, optical distortion can be prevented, and the field-of-view magnifying film 13 can be easily mounted on the liquid crystal display device. Become.
【００２２】〔実施例２〕図４は本発明の第２実施例で
ある視野拡大フィルムの断面図である。実施例１と同様
に、ポリカーボネート樹脂１７上に、紫外線硬化樹脂１
８を塗布し、実施例１と同一の方法で露光した。次に、
現像時間のみを１分に短縮して現像し、２０秒間再露光
して形状を固定した。[Embodiment 2] FIG. 4 is a cross-sectional view of a visual field widening film which is a second embodiment of the present invention. As in Example 1, the ultraviolet curable resin 1 was formed on the polycarbonate resin 17.
8 was applied and exposed in the same manner as in Example 1. next,
Only the development time was shortened to 1 minute for development, and re-exposure was performed for 20 seconds to fix the shape.
【００２３】現像後の形状は、上面平坦部Ｌ1 が２０μ
ｍ、下面平坦部Ｌ2 が１６μｍ、高さＨが１０μｍの台
形形状を有する視野拡大フィルム１９が得られた。この
視野拡大フィルム１９を実施例１と同様に、ＴＦＴ−Ｌ
ＣＤテレビに実装して特性を評価したところ、次表２の
ようになった。The shape after development is such that the top flat portion L 1 is 20 μm.
m, the flat portion L 2 on the lower surface was 16 μm, and the height H was 10 μm. This field-of-view expansion film 19 was used in the same manner as in Example 1 for TFT-L.
When mounted on a CD TV and evaluated for characteristics, the results are shown in Table 2 below.
【００２４】[0024]
【表２】 [Table 2]
【００２５】実施例１に比べ視野角の拡大は少ないもの
の、正面における透過率は６０％まで向上し、従来品と
並べて比較しても目視の上からは顕著な差は感じられな
いほどの透過率を得ている。視野角が６０°であるが、
用途に応じて使用すれば全く問題ないと考える。Although the viewing angle was less widened than in Example 1, the transmittance in the front was improved to 60%, and even when compared side by side with the conventional product, there was no noticeable difference from the visual point of view. Is getting the rate. The viewing angle is 60 °,
I think that there is no problem if it is used according to the application.
【００２６】〔実施例３〕図５は本発明の第３実施例で
ある視野拡大フィルムの断面図である。溶剤キャスト法
または１５０°Ｃで１０分間加熱して応力を除去して形
成した１００μｍ厚さの基材、たとえばポリカーボネー
ト樹脂２０上に、紫外線硬化樹脂２１を８０μｍ厚塗布
した。[Embodiment 3] FIG. 5 is a cross-sectional view of a visual field widening film which is a third embodiment of the present invention. An ultraviolet curable resin 21 was applied to a thickness of 80 μm on a substrate having a thickness of 100 μm formed by solvent casting or heating at 150 ° C. for 10 minutes to remove stress, for example, a polycarbonate resin 20.
【００２７】紫外線硬化樹脂２１は塗布後、完全乾燥に
ならないように乾燥時間を通常の乾燥時間の１／３以下
にして乾燥し、半溶融状態を保持した。半溶融状態の紫
外線硬化樹脂２１上に金型を乗せ、約２００ｇ／ｃｍ2
の圧力をかけた。その間の環境は紫外線硬化樹脂２１の
溶剤が揮発するように、乾燥温度（約６０°Ｃ）に固定
した。ポリカーボネート樹脂２０側から紫外線を約８０
０ｍＪ／ｃｍ2 程度照射した。After the application of the ultraviolet curable resin 21, the drying time was set to 1/3 or less of the usual drying time so as not to be completely dried, and the semi-molten state was maintained. Place the mold on the semi-molten UV curable resin 21 and apply about 200 g / cm 2
Was applied. The environment during that time was fixed at a drying temperature (about 60 ° C.) so that the solvent of the ultraviolet curable resin 21 was volatilized. About 80 ultraviolet rays from the polycarbonate resin 20 side
Irradiation was carried out at about 0 mJ / cm 2 .
【００２８】金型から紫外線硬化樹脂２１を離型する
と、ポリカーボネート樹脂２０上に、光拡大部Ｌ3 が３
５μｍ、水平部Ｌ4 が３５μｍ幅で連続的に構成されて
いる７０μｍピッチの凸状の円弧が等間隔に形成され
た。また、このとき、光拡大部Ｌ 3 は１／４円弧で曲率
半径は概ね２５μｍである。作成後、さらに紫外線を１
００ｍＪ／ｃｍ2 照射して形状を固定し、視野拡大フィ
ルム２２を形成した。The ultraviolet curable resin 21 is released from the mold.
And the light expansion part L on the polycarbonate resin 20.3Is 3
5 μm, horizontal part LFourIs continuously formed with a width of 35 μm
70 μm pitch convex arcs are formed at equal intervals
Was. Also, at this time, the light expanding portion L 3Is a quarter arc curvature
The radius is approximately 25 μm. 1 UV ray after creation
00 mJ / cm2Irradiate to fix the shape and expand the field of view.
Rum 22 was formed.
【００２９】この視野拡大フィルム２２を、図３に示す
ように、ＴＦＴ−ＬＣＤの観察者側の偏光素子１４と液
晶セル１５との間に取付けた。視野拡大フィルム２２は
凸状の円弧の長手方向が画面左右方向に向くように設置
した。従って、視野の拡大は画面上下方向に行なわれ
る。また、賦形面側が液晶セル１５側に向くように設置
した。ここで、表示素子として、市販のＴＦＴ−ＬＣＤ
テレビ、６Ｅ−Ｃ３（シャープ製）を使用した。この状
態で画面を観察したところ以下の表３に示すような結果
が得られた。As shown in FIG. 3, the field-of-view enlarging film 22 was attached between the polarizing element 14 and the liquid crystal cell 15 on the observer side of the TFT-LCD. The field-of-view magnifying film 22 was installed so that the longitudinal direction of the convex arc was oriented in the horizontal direction of the screen. Therefore, the field of view is enlarged in the vertical direction of the screen. Further, it was installed so that the shaping surface side faced the liquid crystal cell 15 side. Here, a commercially available TFT-LCD is used as the display element.
A television, 6E-C3 (manufactured by Sharp) was used. When the screen was observed in this state, the results shown in Table 3 below were obtained.
【００３０】[0030]
【表３】 [Table 3]
【００３１】従来品に比べ、透過率は低下しているが、
実使用には支障ない。視野角については従来品に比べ著
しく向上し、ディスプレイをかなり傾けても階調反転は
起こらず、良好な画像が得られた。また、正面からみた
ときの色ズレ等も起こらなかった。視野拡大フィルム２
２を使用したことで、表示素子の視野角を著しく向上さ
せることができた。Although the transmittance is lower than that of the conventional product,
There is no problem in actual use. The viewing angle was significantly improved compared to the conventional product, and even if the display was tilted considerably, gradation inversion did not occur and a good image was obtained. In addition, there was no color shift when viewed from the front. Field-of-view expansion film 2
By using 2, it was possible to significantly improve the viewing angle of the display device.
【００３２】〔実施例４〕図６は本発明の第４実施例で
ある視野拡大フィルムの断面図である。実施例３と同様
に１５０°Ｃで１０分間加熱して応力を除去した１００
μｍ厚さのポリカーボネート樹脂２３上に紫外線硬化樹
脂２４を８０μｍ厚塗布した。紫外線硬化樹脂２４は塗
布後、完全乾燥にならないように、乾燥時間を通常の乾
燥時間の１／３以下にして乾燥し、半溶融状態を保持し
た。半溶融状態の紫外線硬化樹脂２４上に金型を乗せ、
約２００ｇ／ｃｍ2 の圧力をかけた。その間の環境は紫
外線硬化樹脂２４の溶剤が揮発するように乾燥温度（約
６０°Ｃ）に固定した。[Embodiment 4] FIG. 6 is a cross-sectional view of a visual field widening film which is a fourth embodiment of the present invention. As in Example 3, the stress was removed by heating at 150 ° C. for 10 minutes to remove stress 100.
An ultraviolet curable resin 24 was applied to a thickness of 80 μm on a polycarbonate resin 23 having a thickness of μm. After being applied, the ultraviolet curable resin 24 was dried for 1/3 or less of the normal drying time so as not to be completely dried, and maintained in a semi-molten state. Place the mold on the semi-molten UV curable resin 24,
A pressure of about 200 g / cm 2 was applied. The environment during that time was fixed at a drying temperature (about 60 ° C.) so that the solvent of the ultraviolet curable resin 24 was volatilized.
【００３３】ポリカーボネート樹脂２３側から紫外線を
約８００ｍＪ／ｃｍ2 程度照射した。金型から紫外線硬
化樹脂２４を離型すると、ポリカーボネート樹脂２３上
に、光拡大部Ｌ3 が４０μｍ、水平部Ｌ4 が３０μｍ幅
で連続的に構成されている７０μｍピッチの凸状の円弧
が等間隔に作成できた。また、このとき光拡大部Ｌ3は
１／３円弧で曲率半径は概ね２５μｍで、高さＨは１０
μｍである。作成後、さらに紫外線を１００ｍＪ／ｃｍ
2 照射して紫外線硬化樹脂２４の形状を固定した。作成
した視野拡大フィルム２５を実施例３と同様に、ＴＦＴ
−ＬＣＤテレビに実装して特性を評価した。結果は表４
の通りである。Ultraviolet rays of about 800 mJ / cm 2 were irradiated from the polycarbonate resin 23 side. When the ultraviolet curable resin 24 is released from the mold, a convex arc having a pitch of 70 μm is continuously formed on the polycarbonate resin 23 with the light expanding portion L 3 having a width of 40 μm and the horizontal portion L 4 having a width of 30 μm. I was able to create at intervals. Further, at this time, the light expanding portion L 3 has a ⅓ arc, a radius of curvature of about 25 μm, and a height H of 10 μm.
μm. After making, further ultraviolet rays 100mJ / cm
The shape of the ultraviolet curable resin 24 was fixed by irradiating 2 times. The prepared field-of-view expansion film 25 was used for the TFT as in Example 3.
-It was mounted on an LCD TV and its characteristics were evaluated. The results are shown in Table 4.
It is as follows.
【００３４】[0034]
【表４】 [Table 4]
【００３５】実施例３に比べ視野角が拡大した。±８０
°で視野拡大の効果は大きいと言える。正面における透
過率は４０％と低下したが、実使用上は数値で表れてい
るほどの透過光量の低下は感じられなく、問題はなかっ
た。The viewing angle was expanded as compared with Example 3. ± 80
It can be said that the effect of expanding the field of view is large at °. The transmittance on the front side was reduced to 40%, but in actual use, the reduction in the amount of transmitted light as represented by a numerical value was not felt, and there was no problem.
【００３６】〔比較例〕図７は比較例としての視野拡大
フィルムの断面図である。ポリカーボネート樹脂２６上
に紫外線硬化樹脂２７が塗布され、ピッチが１００μｍ
で１／４円弧の凸状のポリカーボネート製レンチキュラ
ーレンズ２８を、前述した実施例と同一のＬＣＤに実装
して特性を測定したところ以下の表５のようになった。[Comparative Example] FIG. 7 is a cross-sectional view of a visual field expanding film as a comparative example. Ultraviolet curing resin 27 is applied on polycarbonate resin 26, and the pitch is 100 μm.
Then, a convex polycarbonate lenticular lens 28 having a 1/4 circular arc was mounted on the same LCD as in the above-mentioned embodiment and the characteristics were measured.
【００３７】[0037]
【表５】 [Table 5]
【００３８】全方向に光が拡大されるため、正面透過率
が著しく低下している。表示素子としては薄暗く非常に
見にくい。また、位相差があるために映像を動画で表示
した場合、色合いがおかしく、不自然な感じになった。
コントラストにも影響が表れており、必要最小限と言わ
れるコントラスト１００を確保できなかった。テレビ等
の表示素子には不適であった。Since the light is expanded in all directions, the front transmittance is remarkably reduced. It is dim and very difficult to see as a display element. Also, due to the phase difference, when the image was displayed as a moving image, the color tone was strange and the image looked unnatural.
The contrast was also affected, and the minimum required contrast of 100 could not be secured. It was not suitable for display elements such as televisions.
【００３９】以上、本発明者によってなされた発明を、
実施例に基づき具体的に説明したが、本発明は、前記実
施例に限定されるものではなく、その要旨を逸脱しない
範囲で、種々変更可能であることは、言うまでもない。
本実施例は、ポリカーボネート樹脂７、１７、２０、２
３を用いたが、これに代えて、法線方向の平行光線透過
率が低下しない半透明体または透明な材質で屈折率が
１．０以上ある材料、たとえば、ポリメチルメタクリレ
ート、ポリエチレンテレフタレート、ポリエーテルサル
ホン、ポリサルホン、ポリスチレン、ポリ塩化ビニル、
ポリ塩化ビニリデン、ポリテトラフルオロエチレン、ポ
リフッ化ビニリデン、ポリフッ化ビニル、ポリエチレ
ン、ポリビニルアルコール、ポリプロピレン、ポリアク
リルニトリル、ポリ酢酸ビニル、ナイロン６およびナイ
ロン６６等を用いてもよい。As described above, the invention made by the present inventor is
Although the present invention has been specifically described based on the embodiments, it goes without saying that the present invention is not limited to the embodiments and various modifications can be made without departing from the scope of the invention.
In this embodiment, the polycarbonate resins 7, 17, 20, 2 are used.
3 was used, but instead of this, a translucent body in which the parallel light transmittance in the normal direction does not decrease or a transparent material having a refractive index of 1.0 or more, for example, polymethyl methacrylate, polyethylene terephthalate, poly Ether sulfone, polysulfone, polystyrene, polyvinyl chloride,
You may use polyvinylidene chloride, polytetrafluoroethylene, polyvinylidene fluoride, polyvinyl fluoride, polyethylene, polyvinyl alcohol, polypropylene, polyacrylonitrile, polyvinyl acetate, nylon 6 and nylon 66.
【００４０】また、紫外線硬化樹脂８、１８、２１、２
４に代えて、その他の光硬化性樹脂またはエポキシ樹
脂、メラミン樹脂、尿素樹脂およびフェノール樹脂等の
熱硬化性樹脂を用いてもよい。また、ソーダライムガラ
ス等のガラスでもよく、プラスチックの表面にＳｉＯ2
コートや耐湿性等の耐久性に係る保護コート処理がなさ
れていてもよい。処理の方法は塗布であっても蒸着やス
パッタ、イオンビーム等の方法でもよい。また、偏光素
子１４に張付けるよう平滑面に複屈折性を有しない粘着
剤を付与してもよい。Further, the ultraviolet curable resin 8, 18, 21, 2
Instead of 4, other thermosetting resins or thermosetting resins such as epoxy resins, melamine resins, urea resins and phenol resins may be used. Further, glass such as soda lime glass may be used, and SiO 2 is formed on the surface of the plastic.
A coat or a protective coat treatment relating to durability such as moisture resistance may be performed. The treatment method may be coating, vapor deposition, sputtering, ion beam, or the like. Further, a pressure-sensitive adhesive having no birefringence may be provided on the smooth surface so as to be attached to the polarizing element 14.
【００４１】また、光拡大部の断面形状は凸状でも凹状
でもよい。また、光拡大部と水平部とを交互に形成して
いるほうがよく、その割合は用途に応じて最適値を決め
る。また、斜面と水平面との接触部は面取りやＲが付い
ていてもよく、Ｒが斜面の殆どを占めていてもよい。さ
らに、光拡大部の断面形状は円弧でも楕円でも複数の曲
率半径から構成された曲線でもよい。また、曲面と水平
面の接続部が他の角度を有する直線であったり、凸状で
あれば、凹状の、凹状であれば凸状のＲであってもよ
い。The cross-sectional shape of the light expanding portion may be convex or concave. Further, it is better to alternately form the light expanding portion and the horizontal portion, and the ratio thereof is determined to be the optimum value according to the application. Further, the contact portion between the slope and the horizontal plane may be chamfered or rounded, and R may occupy most of the slope. Further, the cross-sectional shape of the light expanding portion may be an arc, an ellipse, or a curve composed of a plurality of radii of curvature. Further, the connecting portion between the curved surface and the horizontal surface may be a straight line having another angle, or may be concave if it is convex and convex R if it is concave.
【００４２】また、中心線からみて右側のみに光を拡大
させたいときは、図８に示すように、ポリカーボネート
樹脂２９上に塗布された紫外線硬化樹脂３０を、接線の
傾きが右上がりのみの円弧等の形状に形成すればよい。
そして、傾斜が０、すなわち水平になったところで、垂
直に面を形成すれば、入射光が垂直入射の平行光線であ
る場合には、左方向には光は拡大されない。また、傾斜
が０になる前に垂直な面としてもよい。また、円弧の反
対側の端部は接線方向が垂直にならずに水平面と接して
もよい。When it is desired to spread the light only to the right side of the center line, as shown in FIG. 8, the ultraviolet curable resin 30 coated on the polycarbonate resin 29 is used as an arc whose tangent line slopes only to the right. It suffices if it is formed in the same shape.
When the surface is formed vertically when the inclination is 0, that is, when the surface is horizontal, the light is not expanded to the left when the incident light is a vertically incident parallel light beam. Further, it may be a vertical surface before the inclination becomes zero. Also, the end portion on the opposite side of the arc may be in contact with the horizontal surface without the tangential direction being vertical.
【００４３】また、凸状または凹状の光拡大部は連続し
ていることが望ましいが、断続的でも一定距離毎に千鳥
であってもよい。また、１光拡大部と１水平面とを合わ
せたものを、１ピッチとすると、１ピッチは液晶セル１
５の１画素より小さいことがよく、１ピッチが２〜３画
素程度であれば、液晶セル１５より大きくしてもよい。
小さい場合は、１画素の大きさがフィルム等のピッチの
整数倍にならないことが必要である。仮になってしまっ
たときは、５倍以上がよい。It is desirable that the convex or concave light expanding portions are continuous, but they may be intermittent or staggered at regular intervals. If one pitch of one light expansion part and one horizontal surface is taken as one pitch, one pitch is the liquid crystal cell 1.
5 is smaller than 1 pixel, and if 1 pitch is about 2 to 3 pixels, it may be larger than the liquid crystal cell 15.
If it is small, it is necessary that the size of one pixel is not an integral multiple of the pitch of the film or the like. If it happens, 5 times or more is better.
【００４４】[0044]
【発明の効果】本願によって開示される発明のうち、代
表的なものによって得られる効果を簡単に説明すれば、
以下のとおりである。本発明の視野拡大フィルムによれ
ば、基材上に光拡大部と平坦部とを交互に形成したの
で、平坦部では光線が曲がることなく、正面に透過し、
光拡大部では視野拡大効果を有するため、液晶ディスプ
レイの画面正面の画像が薄暗くなることなく、画面上下
方向の視野が拡大し、画面を斜め方向から見たときの階
調反転を防止することができる。The effects obtained by the typical ones of the inventions disclosed in this application will be briefly described as follows.
It is as follows. According to the visual field expanding film of the present invention, since the light expanding portion and the flat portion are formed alternately on the base material, the light rays are not bent in the flat portion and transmitted to the front surface,
Since the light magnifying section has a field-of-view expansion effect, the field of view in the vertical direction of the screen is expanded without dimming the image in front of the screen of the liquid crystal display, and it is possible to prevent gradation inversion when the screen is viewed from an oblique direction. it can.
【００４５】また、本発明の視野拡大フィルムによれ
ば、視野拡大フィルム面内方向の光の複屈折位相差を１
０ｎｍ以下にしたので、光学的な歪みを防止することが
でき、液晶表示装置への視野拡大フィルムの搭載を簡便
に行なうことができる。さらに、本発明の視野拡大フィ
ルムの製造方法によれば、集光シートを通して光を照射
し、感光性樹脂を選択的に露光するので、光が所望の方
向に容易に照射され、感光性樹脂に所望の強度分布を有
する光線が入射される。従って、所望の断面形状の視野
拡大フィルムを容易に形成することができると共に、光
のエネルギーロスを減少することができる。Further, according to the visual field expanding film of the present invention, the birefringence phase difference of light in the in-plane direction of the visual field expanding film is set to 1
Since the thickness is 0 nm or less, optical distortion can be prevented, and the field-of-view expanding film can be easily mounted on the liquid crystal display device. Further, according to the method for producing a field-of-view magnifying film of the present invention, light is irradiated through the light-condensing sheet to selectively expose the photosensitive resin, so that the light is easily irradiated in a desired direction to the photosensitive resin. A light ray having a desired intensity distribution is incident. Therefore, it is possible to easily form the visual field expansion film having a desired cross-sectional shape and reduce the energy loss of light.
【図１】本発明の第１実施例である視野拡大フィルムの
製造方法を説明する工程断面図。FIG. 1 is a process cross-sectional view illustrating a method of manufacturing a visual field widening film that is a first embodiment of the present invention.
【図２】本発明の第１実施例である視野拡大フィルムの
断面図。FIG. 2 is a cross-sectional view of a visual field expanding film that is a first embodiment of the present invention.
【図３】本発明の第１実施例である視野拡大フィルムを
実装した液晶表示装置の概略説明図。FIG. 3 is a schematic explanatory view of a liquid crystal display device on which a field-of-view expanding film which is a first embodiment of the present invention is mounted.
【図４】本発明の第２実施例である視野拡大フィルムの
断面図。FIG. 4 is a cross-sectional view of a visual field expanding film that is a second embodiment of the present invention.
【図５】本発明の第３実施例である視野拡大フィルムの
断面図。FIG. 5 is a cross-sectional view of a visual field expanding film that is a third embodiment of the present invention.
【図６】本発明の第４実施例である視野拡大フィルムの
断面図。FIG. 6 is a cross-sectional view of a visual field expanding film that is a fourth embodiment of the present invention.
【図７】比較例の視野拡大フィルムの断面図。FIG. 7 is a cross-sectional view of a visual field expansion film of a comparative example.
【図８】本発明の第５実施例である視野拡大フィルムの
断面図。FIG. 8 is a cross-sectional view of a visual field widening film that is a fifth embodiment of the present invention.
【図９】従来の視野拡大フィルムの製造方法を説明する
工程断面図。9A to 9C are process cross-sectional views illustrating a conventional method for manufacturing a visual field widening film.
１…基材 ２…感光性樹脂 ３…フォトマスク ４…光散乱シート ５…光源 ６…距離 ７、１７、２０、２３、２６、２９…ポリカーボネート
樹脂 ８、１８、２１、２４、２７、３０…紫外線硬化樹脂 ９…ラミネート層 １０…フォトマスク １１…集光シート １２…光源 １３、１９、２２、２５、２８…視野拡大フィルム １４…偏光素子 １５…液晶セル １６…導光シートDESCRIPTION OF SYMBOLS 1 ... Base material 2 ... Photosensitive resin 3 ... Photomask 4 ... Light-scattering sheet 5 ... Light source 6 ... Distance 7, 17, 20, 23, 26, 29 ... Polycarbonate resin 8, 18, 21, 24, 27, 30 ... UV curable resin 9 ... Laminate layer 10 ... Photomask 11 ... Light condensing sheet 12 ... Light source 13, 19, 22, 25, 28 ... Field-enlarging film 14 ... Polarizing element 15 ... Liquid crystal cell 16 ... Light guide sheet
Claims (4)
間隔に形成され、前記基材の表面と前記凸部の最上部と
を結ぶ斜面の一部または全部が所定の角度を有すること
を特徴とする視野拡大フィルム。1. A plurality of convex portions having a flat uppermost portion are formed on a base material at equal intervals, and a part or all of a slope connecting the surface of the base material and the uppermost portion of the convex portion has a predetermined angle. A field-of-view magnifying film having.
曲率半径により構成された曲線からなる複数の凹部また
は凸部を等間隔に形成したことを特徴とする視野拡大フ
ィルム。2. A field-of-view enlarging film, characterized in that a plurality of concave portions or convex portions formed of an arc or an ellipse or a curve constituted by a plurality of curvature radii are formed on a substrate at equal intervals.
ことを特徴とする請求項１または２記載の視野拡大フィ
ルム。3. The visual field expansion film according to claim 1, wherein the birefringence phase difference of light is 10 nm or less.
次形成する工程と、前記フォトマスク上に光線の方向を
任意に変更できる集光シートを形成する工程と、前記集
光シートを通して光を照射し、前記フォトマスクをマス
クとして、前記感光性樹脂を選択的に露光し、現像する
工程とを含むことを特徴とする視野拡大フィルムの製造
方法。4. A step of sequentially forming a photosensitive resin and a photomask on a base material, a step of forming a condensing sheet on the photomask capable of arbitrarily changing the direction of a light beam, and a step of forming light through the condensing sheet. And selectively exposing the photosensitive resin to light using the photomask as a mask, and developing the photosensitive resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7005554A JPH08194217A (en) | 1995-01-18 | 1995-01-18 | Visual field enlarging film and its production |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7005554A JPH08194217A (en) | 1995-01-18 | 1995-01-18 | Visual field enlarging film and its production |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08194217A true JPH08194217A (en) | 1996-07-30 |
Family
ID=11614423
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7005554A Pending JPH08194217A (en) | 1995-01-18 | 1995-01-18 | Visual field enlarging film and its production |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08194217A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002516650A (en) * | 1997-12-23 | 2002-06-04 | キヤノン株式会社 | Projection light source |
| WO2006013969A1 (en) * | 2004-08-06 | 2006-02-09 | Kuraray Co., Ltd. | Light guide plate, production method therefor, and surface light source device provided with it |
| JP2008116913A (en) * | 2006-10-13 | 2008-05-22 | Nec Lcd Technologies Ltd | Method for manufacturing optical element, optical element, illuminating optical apparatus, display apparatus, and electronic apparatus |
| JP2008171796A (en) * | 2006-03-28 | 2008-07-24 | Samsung Electronics Co Ltd | Integrated light guide plate, backlight device equipped with it, and method for manufacturing integrated light guide plate |
| JP2011118393A (en) * | 2009-11-30 | 2011-06-16 | Samsung Corning Precision Materials Co Ltd | Optical film for reducing color shift for liquid crystal display device and liquid crystal display device having the same |
-
1995
- 1995-01-18 JP JP7005554A patent/JPH08194217A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002516650A (en) * | 1997-12-23 | 2002-06-04 | キヤノン株式会社 | Projection light source |
| WO2006013969A1 (en) * | 2004-08-06 | 2006-02-09 | Kuraray Co., Ltd. | Light guide plate, production method therefor, and surface light source device provided with it |
| JPWO2006013969A1 (en) * | 2004-08-06 | 2008-05-01 | 株式会社クラレ | Light guide plate, method for manufacturing the same, and surface light source device including the same |
| EP1780464A4 (en) * | 2004-08-06 | 2009-08-19 | Kuraray Co | Light guide plate, production method therefor, and surface light source device provided with it |
| US7883254B2 (en) | 2004-08-06 | 2011-02-08 | Kuraray Co., Ltd. | Light guide plate, production method therefor, and surface light source device provided with it |
| JP4802094B2 (en) * | 2004-08-06 | 2011-10-26 | 株式会社クラレ | Light guide plate, method for manufacturing the same, and surface light source device including the same |
| JP2008171796A (en) * | 2006-03-28 | 2008-07-24 | Samsung Electronics Co Ltd | Integrated light guide plate, backlight device equipped with it, and method for manufacturing integrated light guide plate |
| JP2008116913A (en) * | 2006-10-13 | 2008-05-22 | Nec Lcd Technologies Ltd | Method for manufacturing optical element, optical element, illuminating optical apparatus, display apparatus, and electronic apparatus |
| US8233114B2 (en) | 2006-10-13 | 2012-07-31 | Nlt Technologies, Ltd. | Method for manufacturing optical element |
| JP2011118393A (en) * | 2009-11-30 | 2011-06-16 | Samsung Corning Precision Materials Co Ltd | Optical film for reducing color shift for liquid crystal display device and liquid crystal display device having the same |
| US8698985B2 (en) | 2009-11-30 | 2014-04-15 | Samsung Corning Precision Materials Co., Ltd. | Optical film for reducing color shift and LCD device having the same |
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