Blue color composition for color filter, color filter, and color image display device

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 contains a LED, and under the following definitions:

• λn nm represents a wavelength at every interval of 5 nm in the visible light range of from 380 to 780 nm;
• TR(λn) a spectral transmittance (%) at a wavelength λn nm by a red pixel of the color filter;
• and I(λn) a relative emission intensity, normalized by a total emission intensity, at a wavelength λn nm from the backlight, the device satisfies the following condition (1):
• I(620-680)×TR(620-680)≧1.1 (1)
• wherein TR(620-680) and I(620-680) represent the average transmittance (%) and the average relative emission intensity at 620 nm≦λn≦680 nm, respectively, and I(λn) is defined as follows:
• S
• ⁡
• (
• λ
• n
• )
• =
• ∫
• λ
• n
• -
• Δλ
• /
• 2
• λ
• n
• +
• Δλ
• /
• 2
• ⁢
• s
• ⁡
• (
• λ
• )
• ⁢
• ⅆ
• λ
• Δλ
• I
• ⁡
• (
• λ
• n
• )
• =
• s
• ⁡
• (
• λ
• n
• )
• ∑
• λ
• =
• 380
• 780
• ⁢
• s
• ⁡
• (
• λ
• n
• )
• where S(λ) represents a measured value of emission intensity at a wavelength λ from the backlight, and Δλ=5 nm.