BACKLIGHT

• Main Authors: KAZAMA NORIFUMI, UEDA TATSUYA, ONO YOJI
• Format: Patent
• Language: English
• Published: 12.07.2012
• 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; 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; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; LIGHTING; MECHANICAL ENGINEERING; NON-LINEAR OPTICS; NON-PORTABLE LIGHTING DEVICES; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; PERFORMING OPERATIONS; PHYSICS; SYSTEMS THEREOF; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; TRANSPORTING; VEHICLE LIGHTING DEVICES SPECIALLY ADAPTED FOR VEHICLEEXTERIORS; WEAPONS

PROBLEM TO BE SOLVED: To provide a backlight which can be used for both transmission type and a reflection type lamp and is bright enough even in a dark place.SOLUTION: The backlight has a light-guide type surface light emitter 2 and a reflecting member 7 arranged from observation side. The surface light emitter 2 uses a transparent base material containing light-diffusion particles and guides light in the longitudinal direction of the transparent base material while scattering light in the thickness direction of the transparent base material. The transparent base material is a light-guide plate having a haze value of 30% or less in thickness direction, and is formed so that an operational value (m-1/%) obtained by dividing its brightness reduction coefficient E (m) by the haze value (%) per 5 (mm) of the transparent base material is 0.55 (m/%) or more and 10.0 (m/%) or less. Further, the reflection member 7 contains a luminous pigment.