SURFACE LIGHT SOURCE DEVICE AND DISPLAY DEVICE

To provide a surface light source device that is suppressed from having luminance unevenness and color unevenness even when a substrate and a diffusion plate are at a short distance from each other.SOLUTION: A surface light source device has: a light emitting element arranged on a substrate; a lumin...

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1. Verfasser:	TAKATORI HIROSHI
Format:	Patent
Sprache:	eng ; jpn
Schlagworte:	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 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
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Beschreibung
Zusammenfassung:	To provide a surface light source device that is suppressed from having luminance unevenness and color unevenness even when a substrate and a diffusion plate are at a short distance from each other.SOLUTION: A surface light source device has: a light emitting element arranged on a substrate; a luminous flux control member arranged on the light emitting element, and controlling light distribution of light emitted from the light emitting element; a first optical sheet which is arranged on the luminous flux control member, and has a plurality of first projection strips each having a first inclined surface, a plurality of projection parts each having a second inclined surface, and a plurality of recessed parts each having a third inclined surface, and controls light distribution of light emitted from the luminous flux control member; and a second optical sheet which is arranged on the first optical sheet, and controls a traveling direction of light transmitted through the first optical sheet.SELECTED DRAWING: Figure 3 【課題】基板と拡散板との距離が近い場合であっても、輝度ムラおよび色ムラを抑制した面光源装置を提供すること。【解決手段】面光源装置は、基板に配置された発光素子と、発光素子の上に配置され、発光素子から出射された光の配光を制御するための光束制御部材と、光束制御部材の上に配置され、それぞれ第１傾斜面を有する複数の第１凸条、それぞれ第２傾斜面を有する複数の凸部またはそれぞれ第３傾斜面を有する複数の凹部を有し、光束制御部材から出射された光の配光を制御するための第１光学シートと、第１光学シートの上に配置され、第１光学シートを透過した光の進行方向を制御するための第２光学シートと、を有する。【選択図】図３