LIGHT DIFFUSION FILM AND DEVICE COMPRISING SAME

• Main Authors: KITAGUCHI TORU, YAKUSHIJIN YOSHIKI, SUDA SATOSHI
• Format: Patent
• Language: English; Korean
• Published: 28.09.2011
• 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; NON-PORTABLE LIGHTING DEVICES; 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; SYSTEMS THEREOF; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLEEXTERIORS; WEAPONS

A light diffusion film having a light diffusion layer which is composed of a continuous phase formed of a polycarbonate resin and a dispersed phase which is dispersed in the continuous phase and formed of a resin having an absolute value of the refractive index difference from that of the polycarbonate resin within the range of 0.045-0.085.  The continuous phase is formed of a polycarbonate resin having a viscosity average molecular weight of 15,000-25,000, and the dispersed phase may be formed of a cyclic olefin resin.  The light diffusion layer may additionally contain a lubricant and/or an antioxidant.  The light diffusion film may additionally have a transparent layer arranged on at least one side of the light diffusion layer.  The light diffusion film can suppress light leakage even when the transmittance is high, thereby enabling a surface light source device such as a backlight type liquid crystal display device to be formed thinner with higher luminance.