Surface-emitting device and liquid crystal display device

• Main Authors: SUGIURA, TAKURO, OHIZUMI, MITUSO
• Format: Patent
• Language: Chinese; English
• Published: 16.08.2003
• 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; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; 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; 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; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ARTCOLLECTIONS [XRACs] AND DIGESTS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; WEAPONS

The surface-emitting device (10) of the present invention includes a light guide panel (12), a light guide (13) placed along one end face (12a) of the light guide panel (12), and light sources (15, 15) placed at the ends of the light guide (13). A side face (12a) of the light guide (13) facing the end face of the light guide panel (12) serves as an emergent surface (13a) for applying light from the light sources (15) to the light guide panel (12), and a side face remote from the emergent surface (13a) serves as a reflecting surface (13b) on which concave grooves (16) for reflecting light propagating inside the light guide are periodically formed at a predetermined pitch. The depth of the concave grooves (16) increases toward the center of the light guide (13), and the angle formed between two inclined faces that constitute each groove (16) is within the range of 105 DEG to 115 DEG. This light-emitting device (10) won't have the whitening phenomenon, the utilization efficiency of light source is high and the e