LAMINATED FRONT PANEL AND METHOD FOR MANUFACTURING THE SAME

• Main Authors: TSUNEKAWA TAKEYUKI, TOGAWA HITOMI, IWATA YOSHIAKI
• Format: Patent
• Language: English; Japanese
• Published: 21.09.2017
• 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 laminated front panel to be disposed on a viewing side of a liquid crystal display device having a polarizing plate on the viewing side, so as to ensure visibility of the device even when the device is observed through polarizing sunglasses.SOLUTION: The laminated front panel is to be used in a liquid crystal display device including a liquid crystal cell A, a polarizing plate B disposed on the viewing side of the liquid crystal cell A, and a backlight light source C having a continuous emission spectrum, in which the laminated front panel is disposed on a viewing side of the polarizing plate B. The laminated front panel has an image display region when viewed from the viewing side, in which a retardation film E having an in-plane retardation ReE (nm) satisfying 3000<ReE≤100000 is disposed on a back side of an injection-molded layer D, and the injection-molded layer D and the retardation film E are directly joined and arranged in such a manner that an angle formed by a slow axis of the retardation film E and an absorption axis of the polarizing plate B ranges from 35 to 55°. A retardation ReH (nm) of the laminated front panel in the image display region satisfies 3000≤ReH.SELECTED DRAWING: Figure 3 【課題】視認側に偏光板を有する液晶表示装置において、偏光サングラスを装着して観察した場合でも、視認性を確保することができるように、視認側に配置される積層フロントパネルを提供する。【解決手段】液晶セルＡと、液晶セルＡの視認側に配された偏光板Ｂと、連続的な発光スペクトルを有するバックライト光源Ｃと、を備えた液晶表示装置において、偏光板Ｂの視認側に配置して使用する積層フロントパネルであって、視認側から見た際に画像表示領域を備えており、射出成形層Ｄの裏面側に、３０００ｎｍ＜ＲｅＥ≦１０００００ｎｍを満たす面内位相差ＲｅＥを有する位相差フィルムＥを配すると共に、射出成形層Ｄと位相差フィルムＥとは、直接接合されており、且つ、位相差フィルムＥの遅相軸と偏光板Ｂの吸収軸とのなす角度が３５〜５５°となるように配し、且つ、画像表示領域における積層フロントパネルの位相差ＲｅＨが３０００ｎｍ≦ＲｅＨを満たす。【選択図】図３