JP5512004B2 - 液晶表示装置および積層偏光板ならびに偏光光源装置 - Google Patents
液晶表示装置および積層偏光板ならびに偏光光源装置 Download PDFInfo
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- JP5512004B2 JP5512004B2 JP2013041027A JP2013041027A JP5512004B2 JP 5512004 B2 JP5512004 B2 JP 5512004B2 JP 2013041027 A JP2013041027 A JP 2013041027A JP 2013041027 A JP2013041027 A JP 2013041027A JP 5512004 B2 JP5512004 B2 JP 5512004B2
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Images
Classifications
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- 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
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- 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
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- 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
- G02F1/13363—Birefringent elements, e.g. for optical compensation
- G02F1/133634—Birefringent elements, e.g. for optical compensation the refractive index Nz perpendicular to the element surface being different from in-plane refractive indices Nx and Ny, e.g. biaxial or with normal optical axis
-
- 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
- G02F1/133531—Polarisers characterised by the arrangement of polariser or analyser axes
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- 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
- G02F1/13363—Birefringent elements, e.g. for optical compensation
- G02F1/133635—Multifunctional compensators
Description
(a)反射型直線偏光層(Pr1)の透過軸と光源側吸収型直線偏光層(P1)の透過軸が略平行に配置されている
(b)前記複屈折層の厚み方向レターデーション(Rth)が250nm≦Rth≦6000nmを満たす
(c)光源(BL)から出射され、反射型直線偏光層(Pr1)を透過した直線偏光のうち、正面方向の光は複屈折層(A)によって実質的にその偏光状態が変換されず、斜め方向の光は複屈折層(A)によって偏光状態が変換される
また、本発明の透過型液晶表示装置において、前記複屈折層(A)の正面レターデーション(Re)を20nm以下とするのも好ましい構成である。
450≦Rth−2×Re≦750 (式2)
500≦Rth−2×Re≦700 (式3)
厚み方向レターデーション(Rth)が500nm以上、6000nm以下であることが好ましく、600nm以上、5000nm以下であることがより好ましく、600nm以上、4000nm以下であることがさらに好ましい。また、正面レターデーション(Re)は、20nm以下であることが好ましく、10nm以下であることがより好ましい。レターデーションを上記範囲とすることで、液晶表示装置に黒画像を表示させた場合の斜め方向の光漏れが低減され、白画像を表示させた場合は、位相差の干渉による画面の色付きが抑制される。
3)直線偏光(r3)は複屈折層(A)を透過する。複屈折層(A)はその遅相軸が、直線偏光(r3)の偏光面と垂直または平行であるか、あるいは、複屈折層(A)の正面レターデーションが実質的にゼロであるため、直線偏光(r3)は偏光状態が変換されず、直線偏光(r4)を透過する。
7)反射型直線偏光層(Pr1)は、直線偏光(r13)を透過し、その直交方向の直線偏光(r12)を反射する。
8)直線偏光(r13)は複屈折層(A)を透過し、入射角によって異なる偏光状態に変換されるが、特定の入射角に対しては、複屈折層(A)はλ/2のレターデーションを有するため、直線偏光(r13)と直交する直線偏光(r14)を透過する。
3)直線偏光(r23)は複屈折層(A)を透過する。複屈折層(A)はその遅相軸が、直線偏光(r23)の偏光面と垂直または平行であるか、あるいは、複屈折層(A)の正面レターデーションが実質的にゼロであるため、直線偏光(r3)は偏光状態が変換されず、直線偏光(r24)を透過する。
8)反射型直線偏光層(Pr1)は、直線偏光(r33)を透過し、その直交方向の直線偏光(r32)は反射する。
9)直線偏光(r33)は複屈折層(A)を透過し、偏光状態が変換される。この際、特定の入射角に対しては、複屈折層(A)はλ/2のレターデーションを有するため、直線偏光(r33)と直交する直線偏光(r34)を透過する。
[TNモード液晶セルへの応用]
(実施例1)
光重合性ネマチック液晶モノマー[BASF社製、商品名「PalioColor LC−242」)、カイラル剤[BASF社製、商品名「PalioColor LC−756」]、光重合開始剤[チバスペシャリティーケミカルズ製、商品名「イルガキュア906」]および溶媒(シクロペンタノン)を、選択反射波長が350nmとなるように調整配合した塗工液を、二軸延伸PETフィルム上にワイヤーバーを用いて乾燥後の厚みで4μmとなるように塗設し、溶液を乾燥した。その後、この液晶モノマーの等方性移転温度まで温度を上げた後、徐冷して均一な配向状態を有したモノマー層を形成した。得られたモノマー層をUV照射することで配向状態を固定し複屈折層を得た。この複屈折層の正面レターデーション(Re)は1nm、厚み方向レターデーション(Rth)は660nmであった。
(実施例2)
実施例1において、偏光板表面への複屈折層の転写の際に用いるアクリル系粘着剤として、予め粒径4.2μmのシリコーン球粒子を分散した光拡散粘着剤を用い、透過型液晶表示装置を得た。
[VAモード液晶セルへの応用]
(実施例3)
機械式攪拌装置、ディーンスターク装置、窒素導入管、温度計及び冷却管を取り付けた反応容器(500mL)内に2,2’−ビス(3,4−ジカルボキシフェニル)ヘキサフルオロプロパン酸二無水物[クラリアントジャパン(株)製]17.77g(40mmol)、及び2,2−ビス(トリフルオロメチル)−4,4’−ジアミノビフェニル[和歌山精化工業(株)製]12.81g(40mmol)を加えた。続いて、イソキノリン2.58g(20mmol)をm−クレゾール275.21gに溶解させた溶液を加え、23℃で1時間攪拌して(600rpm)均一な溶液を得た。次に、反応容器を、オイルバスを用いて反応容器内の温度が180となるように加温し、温度を保ちながら5時時間攪拌して黄色溶液を得た。更に3時間攪拌を行ったのち、加熱及び攪拌を停止し、放冷して室温に戻すと、ポリマーがゲル状となって析出した。
(実施例4)
上記実施例3において、ポリイミドからなる複屈折層を3枚積層したものを用いる代わりに、5枚積層したものを用いた以外は実施例3と同様にして、透過型液晶表示装置を得た。なお、ポリイミドからなる複屈折層を5枚積層して貼り合わせた複屈折層の正面レターデーション(Re)は5nm、厚み方向レターデーション(Rth)は1000nmであった。
(実施例5)
上記実施例3において、ポリイミドからなる複屈折層を3枚積層したものを用いる代わりに、10枚積層したものを用いた以外は実施例3と同様にして、透過型液晶表示装置を得た。なお、ポリイミドからなる複屈折層を10枚積層して貼り合わせた複屈折層の正面レターデーション(Re)は10nm、厚み方向レターデーション(Rth)は2000nmであった。
(実施例6)
上記実施例3において、ポリイミドからなる複屈折層を3枚積層したものを用いる代わりに、15枚積層したものを用いた以外は実施例3と同様にして、透過型液晶表示装置を得た。なお、ポリイミドからなる複屈折層を15枚積層して貼り合わせた複屈折層の正面レターデーション(Re)は15nm、厚み方向レターデーション(Rth)は3000nmであった。
(実施例7)
上記実施例3において、ポリイミドからなる複屈折層を3枚積層したものを用いる代わりに、20枚積層したものを用いた以外は実施例3と同様にして、透過型液晶表示装置を得た。なお、ポリイミドからなる複屈折層を20枚積層して貼り合わせた複屈折層の正面レターデーション(Re)は20nm、厚み方向レターデーション(Rth)は4000nmであった。
(比較例1)
上記実施例3において、ポリイミドからなる複屈折層を3枚積層したものを用いる代わりに、ポリイミドからなる複屈折層を1枚のみ用いた以外は実施例3と同様にして、透過型液晶表示装置を得た。
(比較例2)
市販の反射偏光板[スリーエム社製、商品名「D−BEF」]が適用されているVA液晶モードの20インチテレビ[SONY社製、商品名「KDL−20J3000」]をそのまま用いた。
Pr2 反射型直線偏光層
P1 光源側吸収型直線偏光層
P2 視認側直線偏光層
A 複屈折層
BL 光源
LC 液晶セル
D1 光源側光拡散層
D2 視認側光拡散層
Claims (8)
- 光源(BL)、反射型直線偏光層(Pr1)、複屈折層(A)、光源側吸収型直線偏光層(P1)、液晶セル(LC)、視認側直線偏光層(P2)、および視認側光拡散層(D2)が、この順に配置され、下記の(a)〜(c)の全てを満たす透過型液晶表示装置。
(a)反射型直線偏光層(Pr1)の透過軸と光源側吸収型直線偏光層(P1)の透過軸が略平行に配置されている
(b)前記複屈折層の厚み方向レターデーション(Rth)が250nm≦Rth≦6000nmを満たす
(c)光源(BL)から出射され、反射型直線偏光層(Pr1)を透過した直線偏光のうち、正面方向の光は複屈折層(A)によって実質的にその偏光状態が変換されず、斜め方向の光は複屈折層(A)によって偏光状態が変換される - 前記複屈折層(A)の正面レターデーション(Re)が10nm以上、100nm以下であり、複屈折層(A)の遅相軸と前記反射型直線偏光層(Pr1)の透過軸のなす角が略平行または略垂直である請求項1記載の透過型液晶表示装置。
- 前記複屈折層(A)の正面レターデーション(Re)が20nm以下である請求項1記載の透過型液晶表示装置。
- 前記複屈折層(A)の正面レターデーション(Re)および厚み方向レターデーション(Rth)が、400nm≦Rth−2×Re≦800nmの関係を満たす、請求項1〜3いずれか記載の透過型液晶表示装置。
- 前記複屈折層(A)と、前記光源側吸収型直線偏光層(P1)の間に、光源側吸収型直線偏光層(P1)と透過軸が平行となるように反射型直線偏光層(Pr2)を有する請求項1〜4いずれか記載の透過型液晶表示装置。
- 前記反射型直線偏光層(Pr1)と前記複屈折層(A)、前記光源側吸収型直線偏光層(P1)が粘着剤によって貼合一体化されている、請求項1〜5いずれか記載の透過型液晶表示装置。
- 請求項1〜6のいずれか記載の透過型液晶表示装置に用いられる積層偏光板であって、反射型直線偏光層(Pr1)、複屈折層(A)、光源側吸収型直線偏光層(P1)がこの順に配置されている積層偏光板。
- 請求項1〜6のいずれかに記載の透過型液晶表示装置に用いられる偏光光源装置であって、光源(BL)、反射型直線偏光層(Pr1)、複屈折層(A)、光源側吸収型直線偏光層(P1)がこの順に配置されている偏光光源装置。
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JP2013130882A (ja) | 2013-07-04 |
KR20090024667A (ko) | 2009-03-09 |
TW200914937A (en) | 2009-04-01 |
TWI578031B (zh) | 2017-04-11 |
CN102087439A (zh) | 2011-06-08 |
TW201245779A (en) | 2012-11-16 |
TWI367369B (ja) | 2012-07-01 |
CN101542364A (zh) | 2009-09-23 |
US20120229735A1 (en) | 2012-09-13 |
US20100231831A1 (en) | 2010-09-16 |
JP2009031746A (ja) | 2009-02-12 |
US9158156B2 (en) | 2015-10-13 |
CN101542364B (zh) | 2011-09-07 |
JP5393048B2 (ja) | 2014-01-22 |
KR101017888B1 (ko) | 2011-03-04 |
US9110242B2 (en) | 2015-08-18 |
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