Retardation film and flexible display apparatus comprising the same

• Main Authors: LEE, HEE YOUNG, CHOI, SUK
• Format: Patent
• Language: English; Korean
• Published: 06.12.2017
• 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; ELECTRICITY; FREQUENCY-CHANGING; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

The present invention provides a retardation film. If the longitudinal axis of a film is defined as an X axis, the widthwise axis of the film perpendicular to the X axis is defined as a Y axis, the thickness direction axis of the film perpendicular to the X axis and the Y axis is defined as a Z axis, and each axial refractive index is nx, ny, nz, the retardation film includes a liquid crystal layer having a material of nxny<nz, 2m (m is a positive integer) tilt +C plates of a laminated structure and a +A plate disposed on the 2m tilt +C plates. It is possible to prevent the generation of color shift. 본 발명은 필름의 길이방향 축을 X축, 상기 X축에 수직한 필름의 폭방향 축을 Y축, 상기 X축 및 상기 Y축에 수직한 필름의 두께방향 축을 Z축이라 하고, 각각의 축방향 굴절률을 n, n, n라 할 때, n≠n<n의 재질을 갖는 액정층을 구비한, 적층구조의 2m(m은 양의 정수)개의 틸트 +C플레이트들 및 상기 2m개의 틸트 +C플레이트들 상에 배치되는 +A플레이트를 구비하는, 위상차필름을 제공한다.