BACKLIGHT LIGHT SOURCE DEVICE FOR LIQUID CRYSTAL DISPLAY, ITS WAVELENGTH SELECTION FILTER, COLOR LIQUID CRYSTAL DISPLAY, AND ITS FILTER CONFIGURATION METHOD

摘要

PROBLEM TO BE SOLVED: To illuminate a transmission type color liquid crystal display panel from a rear surface side to display colors of wide range.

SOLUTION: The transmission type color liquid crystal display panel 10 is illuminated from the rear surface side by using a backlight light source device 20 provided with a wavelength selection filter 22 comprising an optical multilayered film formed by alternately laminating high refractive index layers comprising a high refractive index material and low refractive index layers comprising a low refractive index material having a refractive index lower than that of the high refractive index material and having a high transmission characteristic to light of a plurality of specified wavelength regions transmitted through a color filter 19 provided on the transmission type color liquid crystal display panel 10 and no high transmission characteristic to light of a visible wavelength region other than at least the specified wavelength regions and a light source 21 illuminating the color liquid crystal display panel 10 from the rear surface side via the wavelength selection filter 22.

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