ANTIREFLECTION FILM, POLARIZING PLATE, AND DISPLAY DEVICE

• Main Author: OKA SHIGEKI
• Format: Patent
• Language: English
• Published: 19.01.2006
• Subjects: ADVERTISING; CRYPTOGRAPHY; 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; DISPLAY; DISPLAYING; EDUCATION; FREQUENCY-CHANGING; LABELS OR NAME-PLATES; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICAL LOGIC ELEMENTS; OPTICS; PERFORMING OPERATIONS; PHYSICS; SEALS; SIGNS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; TRANSPORTING

PROBLEM TO BE SOLVED: To provide an antireflection film which hardly causes coloring unevenness, has excellent visibility and has improved black display, to provide a polarization plate having the antireflection film, and to provide a display device having the polarization plate. SOLUTION: The antireflection film is made by laminating antireflection layers of a membrane M (refractive index 1.55 to 1.75, membrane thickness 80 to 120 nm), a membrane H (refractive index 1.75 to 2.4, membrane thickness 30 to 70 nm) and a membrane L (refractive index 1.3 to 1.45, membrne thickness 70 to 130 nm) in order on one side surface of a plastic base material having a refractive index of 1.45 to 1.55 at wavelength 550 nm. Therein, material colors in reflection and transmission under a CIE standard illuminant C light source are expressed in the CIELAB color system as follow; for the material color according to reflection, L*value is ≤15, a*value is 0.5 to 5, b*value is -20 to 5 and, for the material color according to transmission, L*value is ≥92, a*value is -3 to 3, b*value is -3 to 3. COPYRIGHT: (C)2006,JPO&NCIPI