POLARIZING PLATE AND LIQUID CRYSTAL DISPLAY DEVICE

• Main Author: HOSOYA YUICHI
• Format: Patent
• Language: English; Japanese
• Published: 06.07.2017
• Subjects: DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

PROBLEM TO BE SOLVED: To provide a polarizing plate for improving punching property of a thin film polarizing plate and light leakage of a thin film display panel.SOLUTION: The polarizing plate of the present invention is configured to sandwich a polarizer with a first protective film having a film thickness of 20 μm or less and a second protective film. The second protective film is a retardation film that comprises a cycloolefin resin having a polar group and a compound A having a molecular weight of 400 to 1200 and containing at least one carbon ring and a heterocycle containing nitrogen or at least three carbon rings, in which the carbon ring has a polar group, by 1 to 20 mass%, and that shows an in-plane retardation value Ro of 0 to 5 nm and a retardation value Rt in a thickness direction of -5 to 5 nm and has a film thickness of 5 to 15 μm. The total thickness of the polarizing plate is 15 to 50 μm.SELECTED DRAWING: None 【課題】本発明の課題は、薄膜偏光板の打抜き性と薄膜表示パネルでの光漏れを改善する偏光板を提供することである。【解決手段】本発明の偏光板は、膜厚が２０μｍ以下である第１の保護フィルムと第２の保護フィルムとによって偏光子を挟持している偏光板であって、前記第２の保護フィルムが、極性基を有するシクロオレフィン系樹脂と、分子量が４００〜１２００の範囲で一つ以上の炭素環と窒素を含む複素環又は三つ以上の炭素環を含み、前記炭素環に極性基を有する化合物Ａを１〜２０質量％の範囲内で含有し、面内位相差値Ｒｏが０〜５ｎｍの範囲内、厚さ方向の位相差値Ｒｔが−５〜５ｎｍの範囲内であり、膜厚が５〜１５μｍの範囲内である位相差フィルムであり、かつ、偏光板としての総厚さが１５〜５０μｍ以下であることを特徴とする。【選択図】なし