Patent ID: 7006172

Claim:
A color liquid crystal display device comprising a combination of light shutters utilizing a liquid crystal, 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, under the following definitions: λ n represents a wavelength at every interval of 5 nm in the visible light region of from 380 to 780 nm; T G (λ n ) a spectral transmittance at a wavelength λ n nm by a green pixel of the color filter; and I(λ n ) a relative emission intensity, normalized by a total emission intensity, at a wavelength λ n nm from the backlight, the device satisfies following conditions (1) to (3): (1) at one wavelength in 500 nm<λ n <530 nm, I (λ n )× T G (λ n )>0.01; (2) in a wavelength region of 610 nm<λ n <650 nm, I (λ n )× T G (λ n )<0.0001; (3) in a wavelength region of 400 nm<λ n <450 nm, I (λ n )× T G (λ n )<0.0001; wherein I(λ n ) is defined as follows: S ⁡ ( λ n ) = ∫ λ n - Δ ⁢ ⁢ λ / 2 λ n + Δλ / 2 ⁢ s ⁡ ( λ ) ⁢ ⁢ ⅆ λ Δ ⁢ ⁢ λ 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.