LIGHTING UNIT AND DISPLAY DEVICE WITH THE SAME

• Main Authors: NISHIDA YOSHIHIDE, TSUCHIYAMA YUJI
• Format: Patent
• Language: English
• Published: 06.01.2011
• 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; INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21Sand F21V, RELATING TO THEFORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THELIGHT EMITTED; 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

PROBLEM TO BE SOLVED: To provide a lighting unit capable of providing uniformity of brightness in a display surface without requiring any complicated process even when a distance between a point light source and a light-receiving surface of a light guide plate is short.SOLUTION: The lighting unit includes: a light guide plate 1; the point light source 3 for illuminating at least one side surface of the light guide plate 1; and an anisotropic light diffuser 8, provided between the light guide plate 1 and the point light source 3, for diffusing light emitted from the point light source 3. The anisotropic light diffuser has anisotropy by which a degree of diffusion differs depending on directions. The anisotropic light diffuser 8 is an anisotropic light diffusion sheet with a particulate dispersion phase 8e included in an anisotropic light diffusion layer 8b thereof.