JP4441283B2 - 広視野角偏光板の製造方法 - Google Patents
広視野角偏光板の製造方法 Download PDFInfo
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- JP4441283B2 JP4441283B2 JP2004026684A JP2004026684A JP4441283B2 JP 4441283 B2 JP4441283 B2 JP 4441283B2 JP 2004026684 A JP2004026684 A JP 2004026684A JP 2004026684 A JP2004026684 A JP 2004026684A JP 4441283 B2 JP4441283 B2 JP 4441283B2
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/32—Holograms used as optical elements
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1337—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers
- G02F1/133753—Surface-induced orientation of the liquid crystal molecules, e.g. by alignment layers with different alignment orientations or pretilt angles on a same surface, e.g. for grey scale or improved viewing angle
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Chemical & Material Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Polarising Elements (AREA)
- Liquid Crystal (AREA)
- Electroluminescent Light Sources (AREA)
Description
トリアセチルセルロースフィルム(透明性保護層、厚さ80μm)の片面に液晶ポリマーのディスコティック液晶層(複屈折層)が密着付設された光学補償フィルム(富士写真フィルム社製、製品名:WVA12B、層厚108μm)を、60℃のNaOH水溶液に30秒間浸漬してケン化処理を行った。その後、100℃で40秒間加熱乾燥した。このとき、自動複屈折測定装置(KOBRA21ADH、王子計測機器社製)を用いて測定した光学補償フィルムの加熱前後の正面位相差値(Δnd)は、加熱前が31.7nm、加熱後が23.3nmであった。
本実施例2に於いては、前記実施例1に於いて100℃で行ったケン化処理後の加熱乾燥を70℃で行った以外は、前記実施例1と同様にして実施例2に係る広視野角偏光板を作製した。
本実施例3に於いては、前記実施例1に於いて100℃で行ったケン化処理後の加熱乾燥を120℃で行った以外は、前記実施例1と同様にして実施例3に係る広視野角偏光板を作製した。
比較例1に於いては、前記実施例1に於いて100℃で行ったケン化処理後の加熱乾燥を65℃で行った以外は、前記実施例1と同様にして比較例1に係る広視野角偏光板を作製した。このとき、実施例1と同様にして光学補償フィルムの加熱前後の正面位相差値(Δnd)を測定したところ、加熱前が31.6nm、加熱後が31.4nmであった。
比較例2に於いては、前記比較例1に於いて65℃で行ったケン化処理後の加熱乾燥を130℃で行った以外は、前記比較例1と同様にして比較例2に係る広視野角偏光板を作製した。
コントラストの評価は、前記実施例又は比較例において作製した広視野角偏光板を、TFT型液晶セル(TNモード)の両面側に配置し、それぞれ白色輝度及び黒色輝度を測定して行った。輝度の測定には、輝度計(商品名:BM−5A、TOPCON社製)を使用した。この様にして得た輝度の値から、表示画面の正面方向のコントラスト(白色輝度/黒色輝度)を算出した。それらの結果を表1に示す。同表から明らかな様に、本実施例1〜3に係る広視野角偏光板については、良好なコントラストが得られた。
端面観察は、前記実施例又は比較例に於いて作製した広視野角偏光板をA4サイズに打ち抜き、端面を観察して行った。評価は、端面に於いて破壊面が一箇所も無ければ○とし、一箇所でも有れば×とした。結果を表1に示す。同表から明らかな様に、本実施例1〜3に係る広視野角偏光板に於いてはクラック等の破壊面が観察されなかった。その一方、比較例2に係る広視野角偏光板に於いては、クラックによる破壊面が観察された。
Claims (4)
- 透明性保護層の少なくとも片面側に、液晶ポリマーを含み構成される複屈折層を有する光学補償フィルムと、偏光子とを有する広視野角偏光板の製造方法であって、
前記光学補償フィルムを68℃〜125℃の範囲内で熱処理して、前記複屈折層の正面位相差を低減させる工程と、
前記偏光子と前記光学補償フィルムとを、前記透明性保護層を接着面として、接着剤を介して貼り合わせる工程とを有することを特徴とする広視野角偏光板の製造方法。 - 前記熱処理の前に、前記複屈折層を備えた透明性保護層をケン化処理する工程を含むことを特徴とする請求項1に記載の広視野角偏光板の製造方法。
- 前記液晶ポリマーとしてディスコティック液晶ポリマーを使用することを特徴とする請求項1又は2に記載の広視野角偏光板の製造方法。
- 前記透明性保護層としてトリアセチルセルロースフィルムを使用することを特徴とする請求項1〜3の何れか1項に記載の広視野角偏光板の製造方法。
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KR1020050008458A KR20050078987A (ko) | 2004-02-03 | 2005-01-31 | 광시야각 편광판의 제조방법 |
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