Patent ID: 7619726

Claim:
A color filter having a red photoresist, a green photoresist and a blue photoresist, and having characteristics defined by following terms: a first spectrum of dark state a(λ), which is measured for light emitted from a backlight through two polarizers when the color filter is disposed between the two polarizers with polarization directions orthogonal to each other; a second spectrum of dark state b(λ), which is measured for light emitted from the backlight through the two polarizers without the color filter disposed between the two polarizers; a ratio spectrum of light leakage intensity I(λ), which is defined as the ratio of the first spectrum of dark state to the second spectrum of dark state (a(λ)/b(λ)); a first ratio of light leakage intensity P 1 , which is the maximum value in a first wavelength region in the ratio spectrum of light leakage intensity I(λ), wherein the first wavelength region is corresponding to overlap between the ratio spectrum of light leakage intensity of a green photoresist and that of a blue photoresist; a second ratio of light leakage intensity P 2 , which is the maximum value in a second wavelength region in the ratio spectrum of light leakage intensity I(λ), wherein the second wavelength region is corresponding to the ratio spectrum of light leakage intensity of a red photoresist; a first average value P 1,avg , which is obtained by averaging N 1 number of ahead of the first ratio of light leakage intensity P 1 and N 1 number of behind the first ratio of light leakage intensity P 1 ; and a second average value P 2,avg , which is obtained by averaging N 2 number of ahead of the second ratio of light leakage intensity P 2 and N 2 number of behind the second ratio of light leakage intensity P 2 ; characterized in that, the color filter satisfying below conditions: P 1 <1, P 2 <1 and 0.74≦P 1,avg /P 2,avg ≦2.