OPTICAL SHEET

• Main Author: ONO YOJI
• Format: Patent
• Language: English
• Published: 21.05.2009
• Subjects: BLASTING; 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; FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMSTHEREOF; HEATING; LIGHTING; MECHANICAL ENGINEERING; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHERARTICLES, NOT OTHERWISE PROVIDED FOR; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; WEAPONS

PROBLEM TO BE SOLVED: To provide an optical sheet in which a light shielding characteristic of a light shielding part is high and stripe mottles of brightness and darkness cannot be easily conspicuous. SOLUTION: The optical sheet 1 has a viewing angle control layer 2 in which a prism rows 11 and the light shielding parts 20 are alternately arranged and the light shielding part 20 has a cross section of an nearly V shape in an arrangement direction. In the cross section of the nearly V shape, C1wt.% of first light shielding particles with a particle size of ≥W0.1and C2wt.% of second light shielding particles with a particle size of <W0.1are contained and expressions (1), (2) are satisfied, wherein H(μm) denotes height, W(μm) denotes maximum width and width of the light shielding part at a distance of 0.1H(μm) from a V top end part is W0.1(μm).(1) 10≤C1×W≤1000, (2) 1≤C2×W0.1≤100. COPYRIGHT: (C)2009,JPO&INPIT