Abstract: Provided is a liquid crystal display device that has a wide reproduced color gamut without noticeable color unevenness even if it is an image display device that shows an steep emission spectrum in the red region, in particular, even if it comprises a light source having a steep emission spectrum in the red region, such as a KSF phosphor, as a backlight light source. The image display device comprises an image display cell and at least one polarizer, wherein the at least one polarizer is a polarizer in which light incident on the polarizer has a plurality of peak groups in the range of 600 to 650 nm, and the at least one polarizer comprises a polarizing element-protection film having a 45-degree light source fit index (FI(45)) of 0.4 or more and 0.62 or less as determined by the following formula 1: FI(45)=Wd/[Wc/(Rob(45)/Wc)]??formula 1.

Abstract: A method for the separation of suspended solids in waste water is disclosed. In order to clean waste water, suspended solids contained in the waste water are separated by adding a magnet-sensitive powder to the waste water, forming agglomerates by adhesion of the suspended solids with the magnet-sensitive powder, whereby the suspended solids are increased in weight to promote gravity settling, and attracting the agglomerates to one or more magnets attached to the bottom of the separation tank to precipitate the agglomerates rapidly. A device for the separation of suspended solids in waste water is also disclosed.