SURFACE LIGHT SOURCE DEVICE, VIDEO SOURCE UNIT AND LIQUID CRYSTAL DISPLAY DEVICE

• Main Authors: ASANO EIJI, HAYASHIDA EHAN
• Format: Patent
• Language: English; Japanese
• Published: 06.04.2017
• 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; 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; SYSTEMS THEREOF; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLEEXTERIORS; WEAPONS

PROBLEM TO BE SOLVED: To provide a surface light source device which emits light with high luminance into a plurality of eye-point directions, which limits light emission to the other directions and in which a structure for that purpose is simple.SOLUTION: A surface light source device includes: a light guide plate; a light source arranged at one end surface of the light guide plate; a light source or a reflection member arranged on the end surface on the opposite side; and a prism sheet arranged on the light emission side of the light guide plate and for emitting the incident light by changing the direction. The prism sheet has: a sheet-like body part having light transmissivity; and a unit prism part which is arranged on the surface side of the light guide plate side out of the body part, in which a plurality of convex unit prisms extend by having a predetermined cross section in the direction along the sheet surface of the body part, and which is arrayed in the direction different from the extending direction. When the direction orthogonal to the light guide direction is defined as 0 degree, the direction in which the unit prisms extend is inclined in a range of over 0 degree and below 90 degrees.SELECTED DRAWING: Figure 2 【課題】複数のアイポイント方向に高い輝度の光を出光し、他の方向への出光を制限し、そのための構造が簡易である面光源装置を提供する。【解決手段】導光板と、導光板の一つの端面に配置される光源と、その反対側の端面に配置される光源又は反射部材と、導光板の出光側に配置され、入射した光の向きを変えて出射するプリズムシートと、を備え、プリズムシートは、光透過性を有するシート状の本体部と、本体部のうち導光板側の面側に配置され、複数の凸状の単位プリズムが本体部のシート面に沿った方向に所定の断面を有して延び、当該延びる方向とは異なる方向に配列された単位プリズム部と、を有し、単位プリズムが延びる方向は、導光方向に直交する方向を０度としたときに、０度を超え９０度未満の範囲で傾いている。【選択図】図２