JP2561483B2 - Light control film - Google Patents
Light control filmInfo
- Publication number
- JP2561483B2 JP2561483B2 JP62214798A JP21479887A JP2561483B2 JP 2561483 B2 JP2561483 B2 JP 2561483B2 JP 62214798 A JP62214798 A JP 62214798A JP 21479887 A JP21479887 A JP 21479887A JP 2561483 B2 JP2561483 B2 JP 2561483B2
- Authority
- JP
- Japan
- Prior art keywords
- film
- light
- birefringent
- light control
- polarizing
- 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.)
- Expired - Lifetime
Links
Description
【発明の詳細な説明】 産業上の利用分野 本発明は、偏光フィルム間に複屈折性フィルムを設け
たラミネートからなり、車載用や計測機用の表示パネル
等に好適な視野角制御方式のライトコントロールフィル
ムに関する。Description: TECHNICAL FIELD The present invention comprises a laminate having a birefringent film provided between polarizing films, and is a light of a viewing angle control system suitable for a display panel for vehicles or measuring instruments. Regarding control film.
従来の技術及び問題点 従来、不要光を遮断して視認性の向上をはかるライト
コントロールフィルムとしては、透明部と不透明部を１
〜40μｍピッチで簾状に設けたものが知られていた。し
かしながら、狭幅の透明部と不透明部を交互に形成する
必要のあることから精密加工が要求されてその製造が難
しく、かつ大面積物を得にくい難点があった。2. Description of the Related Art Conventionally, as a light control film that blocks unnecessary light and improves visibility, a transparent part and an opaque part are conventionally used.
It was known that a blind was provided at a pitch of -40 μm. However, since it is necessary to alternately form a narrow transparent portion and an opaque portion, precision processing is required, which makes it difficult to manufacture, and it is difficult to obtain a large area product.
問題点を解決するための手段 本発明は、フィルムのラミネート処理という簡単な作
業で容易に大面積物も得ることができるライトコントロ
ールフィルムの提供を目的とする。Means for Solving the Problems An object of the present invention is to provide a light control film capable of easily obtaining a large area product by a simple operation of laminating a film.
すなわち、本発明のライトコントロールフィルムは、
偏光フィルムと電極を有しない複屈折性フィルムのラミ
ネートからなり、偏光フィルム間に複屈折性フィルムが
配置されたサンドイッチ構造を有し、所定の角度で斜め
入射した光を遮るようにしたものである。That is, the light control film of the present invention,
It consists of a laminate of a polarizing film and a birefringent film without an electrode, and has a sandwich structure in which the birefringent film is arranged between the polarizing films, so that the light obliquely incident at a predetermined angle is blocked. .
作用 偏光フィルム間に複屈折性フィルムを配置したサンド
イッチ構造とすることにより、所定の角度で斜め入射し
た光が干渉により遮られる。その結果、不要光を遮って
視野角を制御することが可能となり、それにより視認性
が向上する。Action With a sandwich structure in which a birefringent film is arranged between polarizing films, light obliquely incident at a predetermined angle is blocked by interference. As a result, it becomes possible to block unnecessary light and control the viewing angle, thereby improving visibility.
実施例 第１図において、１は偏光フィルムであり、２は複屈
折性フィルムである。偏光フィルム１は電極を有しない
複屈折性フィルム２の両側にラミネートされており、全
体としてサンドイッチ構造を形成している。Example In FIG. 1, 1 is a polarizing film and 2 is a birefringent film. The polarizing film 1 is laminated on both sides of the birefringent film 2 having no electrode, and forms a sandwich structure as a whole.
本発明のライトコントロールフィルムにおいて、遮光
する入射角度の制御は中間層の複屈折性フィルムにより
行われる。In the light control film of the present invention, the incident angle for blocking light is controlled by the birefringent film of the intermediate layer.
すなわち、複屈折性フィルムの屈折率の縦方向をnM、
横方向をnT、厚さ方向をnZとし、フィルム厚さをｄとし
た場合、 入射角度が０度（垂直）の光に対する複屈折性フィル
ムの合成屈折率（nO）は次式１で表される。That is, the longitudinal direction of the refractive index of the birefringent film is n M ,
When the lateral direction is n T , the thickness direction is n Z , and the film thickness is d, the composite refractive index (n O ) of the birefringent film for light with an incident angle of 0 degree (vertical) is given by the following formula 1. It is represented by.
式1: 一方、入射角度がθ（≠０）の光（第１図参照）に対
する複屈折性フィルムの合成屈折率（nX）は次式２で表
される。Formula 1: On the other hand, the composite refractive index (n X ) of the birefringent film with respect to light having an incident angle of θ (≠ 0) (see FIG. 1) is represented by the following expression 2.
式2: また、複屈折性フィルムにおける前記入射方向θの複
屈折度（RX）は次式３で表される。Formula 2: The degree of birefringence (R X ) of the birefringent film in the incident direction θ is represented by the following expression 3.
式3: RX＝（no−nX）d/cosθ この式３におけるRXが400〜800nmとなる範囲で遮光が
有効であって、550nmの場合に最も有効であり、また150
0〜1800nmあるいは2500〜3000nmとなる範囲においても
遮光が可能であるので、前記のRXを満足する複屈折性フ
ィルムが選択使用される。一般には次式４を満足する複
屈折性フィルムが用いられる。Formula 3: R X = (n o −n X ) d / cos θ Light shielding is effective in the range where R X in this Formula 3 is 400 to 800 nm, most effective at 550 nm, and 150
Since light can be shielded even in the range of 0 to 1800 nm or 2500 to 3000 nm, a birefringent film satisfying the above R X is selected and used. Generally, a birefringent film satisfying the following expression 4 is used.
式4: 500nm＜｛（nM＋nT）/2−nZ｝ｄ＜2500nm ちなみに、偏光フィルムとしてポリビニルアルコール
系延伸フィルムをヨウ素で染色処理してなる透過率が46
％で偏光度が93％のもの（日東電気工業社製、NPE T12
05）を用い、複屈折性フィルムとしてnMが1.651、nTが
1.673、nZが1.491で、厚さが５μｍの延伸ポリエステル
フィルムを用いて得た本発明のライトコントロールフィ
ルムの場合、上記した式１のnOは1.662となり、θが50
度のときの式２におけるnXは1.585となる。従って、式
３のRXは599nmとなる。Equation 4: 500nm <{(n M + n T) / 2-n Z} d <2500nm By the way, becomes a polyvinyl alcohol stretched film as a polarizing film by dyeing with iodine transmittance 46
% With a polarization degree of 93% (NPE T12 manufactured by Nitto Denki Kogyo KK)
05), using a birefringent film with n M of 1.651 and n T of
In the case of the light control film of the present invention obtained by using a stretched polyester film having a thickness of 1.673 and n Z of 1.491 and a thickness of 5 μm, n O of the above formula 1 is 1.662 and θ is 50.
N X in Equation 2 in degrees is 1.585. Therefore, R X in Equation 3 is 599 nm.
このライトコントロールフィルムは第２図に示したグ
ラフから明からなように、入射角（視角度）が50度付近
となる光を最も遮光し、その透過率は入射角が50度の光
で約2.5％、０度の光（垂直入射光）で40％であった。
なお、前記ライトコントロールフィルムにおける偏光フ
ィルムはそれらの吸収軸が平行関係となるよう、かつ複
屈折性フィルムの縦方向（nM方向）に対し45度の交差角
度となるよう配置されており、複屈折性フィルムの光軸
は偏光フィルムの吸収軸に対し直交関係にある。As is clear from the graph shown in Fig. 2, this light control film shields most of the light with an incident angle (viewing angle) of around 50 degrees, and its transmittance is about 50 degrees at an incident angle of 50 degrees. It was 2.5% and 40% at 0 degree light (normal incidence light).
The polarizing film in the light control film is arranged such that the absorption axes thereof are in a parallel relationship and the crossing angle is 45 degrees with respect to the longitudinal direction (n M direction) of the birefringent film. The optical axis of the refractive film is orthogonal to the absorption axis of the polarizing film.
本発明のライトコントロールフィルムにおいて、入射
側の偏光フィルムは入射光を偏光させるためのものであ
り、透過側の偏光フィルムは複屈折性フィルムを透過し
た光のフィルタである。従って、偏光フィルム間の吸収
軸の交差角度を変えることにより透過光量を制御するこ
とができる。一般には、偏光フィルムはそれらの吸収軸
が平行関係となるように配置される。用いる偏光フィル
ムについては特に限定はない。フィルム偏光子に保護層
を設けたものなどであってもよい。なお、複屈折性フィ
ルムは通常その光軸が入射側偏光フィルムの吸収軸に対
して平行関係又は直交関係となるように配置される。In the light control film of the present invention, the incident side polarizing film is for polarizing incident light, and the transmitting side polarizing film is a filter for the light transmitted through the birefringent film. Therefore, the amount of transmitted light can be controlled by changing the crossing angle of the absorption axes between the polarizing films. Generally, polarizing films are arranged such that their absorption axes are in a parallel relationship. The polarizing film used is not particularly limited. For example, a film polarizer provided with a protective layer may be used. The birefringent film is usually arranged such that its optical axis is parallel or orthogonal to the absorption axis of the incident side polarizing film.
本発明のライトコントロールフィルムは、ある角度以
上の斜め入射光の遮光が望まれるもの、例えば表示装置
や窓などに好ましく適用され、それらの装置に貼着する
など適宜な方式で取り付けられる。The light control film of the present invention is preferably applied to those for which it is desired to shield obliquely incident light having a certain angle or more, for example, display devices and windows, and is attached by an appropriate method such as sticking to those devices.
発明の効果 本発明のライトコントロールフィルムは、偏光フィル
ムと複屈折性フィルムのラミネート処理で得られるの
で、その製造が簡単であり、大面積物も容易に作製する
ことができる。また、使用するフィルム、殊に複屈折性
フィルムを変えるという簡単な方法で遮光特性を容易に
コントロールできる利点なども有する。EFFECTS OF THE INVENTION The light control film of the present invention is obtained by laminating a polarizing film and a birefringent film, so that the production thereof is simple and a large area product can be easily produced. Further, it also has an advantage that the light-shielding property can be easily controlled by a simple method of changing a film to be used, especially a birefringent film.
第１図は実施例の断面図、第２図は遮光特性を示したグ
ラフである。 1:偏光フィルム 2:複屈折性フィルムFIG. 1 is a cross-sectional view of the embodiment, and FIG. 2 is a graph showing a light blocking characteristic. 1: Polarizing film 2: Birefringent film
Claims (3)
ィルムのラミネートからなり、偏光フィルム間に複屈折
性フィルムが配置されたサンドイッチ構造を有し、所定
の角度で斜め入射した光を遮るようにしたライトコント
ロールフィルム。1. A laminate structure comprising a polarizing film and a birefringent film having no electrode, and having a sandwich structure in which the birefringent film is arranged between the polarizing films, so as to block light obliquely incident at a predetermined angle. Light control film.
特許請求の範囲第１項記載のフィルム。2. The film according to claim 1, wherein the absorption axes of the polarizing films are parallel to each other.
ある特許請求の範囲第１項記載のフィルム。 500nm＜｛（nM＋nT）/2−nZ｝ｄ＜2500nm （ただしnMは縦方向の屈折率、nTは横方向の屈折率、nZ
は厚さ方向の屈折率、ｄは厚さである。）3. The film according to claim 1, wherein the birefringent film satisfies the following formula. 500nm <{(n M + n T) / 2-n Z} d <2500nm ( but n M is the longitudinal direction of the refractive index, n T is the transverse direction of the refractive index, n Z
Is the refractive index in the thickness direction, and d is the thickness. )
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62214798A JP2561483B2 (en) | 1987-08-28 | 1987-08-28 | Light control film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62214798A JP2561483B2 (en) | 1987-08-28 | 1987-08-28 | Light control film |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6457203A JPS6457203A (en) | 1989-03-03 |
| JP2561483B2 true JP2561483B2 (en) | 1996-12-11 |
Family
ID=16661699
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62214798A Expired - Lifetime JP2561483B2 (en) | 1987-08-28 | 1987-08-28 | Light control film |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2561483B2 (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7317498B2 (en) | 2002-04-24 | 2008-01-08 | Nitto Denko Corporation | Viewing angle magnification liquid crystal display unit |
| US7326451B2 (en) | 2003-10-23 | 2008-02-05 | Nitto Denko Corporation | Rotatory polarization plate, optical element, light condensation backlight system and liquid crystal display |
| US7393570B2 (en) | 2003-01-10 | 2008-07-01 | Nitto Denko Corporation | Broad-band-cholesteric liquid-crystal film, process for producing the same, circularly polarizing plate, linearly polarizing element, illiminator, and liquid-crystal display |
| US7446848B2 (en) | 2003-06-24 | 2008-11-04 | Nitto Denko Corporation | Optical element, condensing backlight system and liquid crystal display |
| US7593079B2 (en) | 2003-05-19 | 2009-09-22 | Nitto Denko Corporation | Optical device, light-condensing backlight system, and liquid crystal display |
| US7746421B2 (en) | 2003-10-23 | 2010-06-29 | Nitto Denko Corporation | Optical element, light condensation backlight system, and liquid crystal display |
| US9348176B2 (en) | 2012-08-27 | 2016-05-24 | Sharp Kabushiki Kaisha | Liquid crystal display device |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008027507A (en) * | 2006-07-20 | 2008-02-07 | Sanyo Electric Co Ltd | Optical pickup device |
| JP5084441B2 (en) * | 2007-10-25 | 2012-11-28 | 林テレンプ株式会社 | Light control element |
| JP5235939B2 (en) * | 2010-05-14 | 2013-07-10 | 株式会社ジャパンディスプレイイースト | Optical element and display device using the same |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59177505A (en) * | 1983-03-28 | 1984-10-08 | Nitto Electric Ind Co Ltd | Circularly polarizing plate |
| FR2564605B1 (en) * | 1984-05-18 | 1987-12-24 | Commissariat Energie Atomique | LIQUID CRYSTAL CELL CAPABLE OF PRESENTING A HOMEOTROPIC STRUCTURE, WITH BIREFRINGENCE COMPENSATED FOR THIS STRUCTURE |
| JPS62264023A (en) * | 1986-05-12 | 1987-11-17 | Saiteku Kk | Optical controller |
-
1987
- 1987-08-28 JP JP62214798A patent/JP2561483B2/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7317498B2 (en) | 2002-04-24 | 2008-01-08 | Nitto Denko Corporation | Viewing angle magnification liquid crystal display unit |
| US7393570B2 (en) | 2003-01-10 | 2008-07-01 | Nitto Denko Corporation | Broad-band-cholesteric liquid-crystal film, process for producing the same, circularly polarizing plate, linearly polarizing element, illiminator, and liquid-crystal display |
| US7593079B2 (en) | 2003-05-19 | 2009-09-22 | Nitto Denko Corporation | Optical device, light-condensing backlight system, and liquid crystal display |
| US7446848B2 (en) | 2003-06-24 | 2008-11-04 | Nitto Denko Corporation | Optical element, condensing backlight system and liquid crystal display |
| US7326451B2 (en) | 2003-10-23 | 2008-02-05 | Nitto Denko Corporation | Rotatory polarization plate, optical element, light condensation backlight system and liquid crystal display |
| US7746421B2 (en) | 2003-10-23 | 2010-06-29 | Nitto Denko Corporation | Optical element, light condensation backlight system, and liquid crystal display |
| US9348176B2 (en) | 2012-08-27 | 2016-05-24 | Sharp Kabushiki Kaisha | Liquid crystal display device |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6457203A (en) | 1989-03-03 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| EXPY | Cancellation because of completion of term |