SURFACE LIGHT SOURCE DEVICE AND LIQUID CRYSTAL DISPLAY APPARATUS

• Main Authors: MAEDA, Saki, SUGINO, Shinya, NIIKURA, Eiji, TAKESHIMA, Masaaki, SAWANAKA, Tomohiko, YAMAMOTO, Takeshi
• Format: Patent
• Language: English
• Published: 23.07.2020
• Subjects: 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; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF

A surface light source device includes: a source to emit light including first rays and second rays emitted in mutually perpendicular directions; and an element to change a light distribution of the light. The element includes: an incident surface to receive the first and second rays; a layer including a material for diffusing the first and second rays; a first surface through which an optical axis of the element passes, part of the first rays reaching the first surface after passing through the layer without being diffused by the material; a second surface extending from the first surface toward the source, part of the second rays reaching the second surface after passing through the layer without being diffused by the material; and a reflecting surface facing the first surface, part of the first rays being reflected by the reflecting surface toward the second surface after reflected by the first surface.