Patent ID: 8451401

Claim:
A color image display device comprising: a plurality of light shutters; a color filter having color elements of at least three colors of red, green and blue corresponding to the light shutters; and a backlight for transmission illumination, wherein the backlight has a phosphor layer or a phosphor film, the phosphor layer or the phosphor film comprises a compound represented by formula (2B): M1 x Ba y M2 z L u O v N w (2B), where M1 is at least one activating element selected from the group consisting of Cr, Mn, Fe, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm and Yb, M2 is at least one bivalent metal element selected from the group consisting of Sr, Ca, Mg and Zn, L is a metal element selected from metal elements belonging to Groups 4 and 14 of the Periodic Table, and x, y, z, u, v and w are numerical values satisfying, respectively: 0.00001 ≦x≦ 3, 0 ≦y≦ 2.99999, 2.6 ≦x+y+z≦ 3, 0 <u≦ 11, 8 <v< 25, and 0 <w≦ 17, and the compound represented by the formula (2B) is a green phosphor having an emission peak wavelength within a range of from 500 nm to 530 nm.