To reduce unnatural coloring of the filter itself, which is installed at the front side of the electronic display, due to external light.
In the electronic display filter having at least one minimum value of transmittance in a visible light area with a wavelength of 400-700 nm, if the transmittances (%) a, b and c of the wavelengths where blue, green and red luminous peaks exist in a fluorescent tube of a three-wavelength region light-emitting type is compared, the difference between the maximum and minimum values of transmittance (%) is restricted within 10, so that the unnatural coloring of the filter itself by external light is reduced, even in a fluorescent lamp such as F10 or F6 in which a large luminous peak exists in the external light of 435 nm, 545 nm, and 610 nm, by maintaining the balance of emission spectrum of the fluorescent lamp by the filter.
OZAWA TETSUO
SAITO YASUYO
Torii Kazuhisa
Higashio Masahiro