Patent ID: 8040467

Claim:
A color image display device comprising a combination 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, and the phosphor layer or the phosphor film comprises a compound represented by formula (4): M 4 f A g D h E i X j (4) wherein M 4 is at least one element selected from the group consisting of Mn, Ce, Pr, Nd, Sm, Eu, Tb, Dy, Ho, Er, Tm and Yb, and comprises at least Eu, A is at least one element selected from the group consisting of bivalent metal elements other than the element M 4 , D is at least one element selected from the group consisting of tetravalent metal elements, E is at least one element selected from the group consisting of trivalent metal elements, X is at least one element selected from the group consisting of O, N and F, and f to j are: 0.00001 ≦f≦ 0.1 f+g= 1 0.5 ≦h≦ 1.8 0.5 ≦i≦ 1.8 0.8×(2/3+4/3 ×h+i )≦ j j≦ 1.2×(2/3+4/3 ×h+i ).