Patent ID: 6693688
Filing Date: 2004-02-17
Classification: G02F

Abstract:
A flat display device comprising:a first polarization plate having a polarization axis and adapted to transmit linearly polarized light along the polarization axis; an optical modulation layer locked behind the first polarization plate to modulate incident light in accordance with an applied voltage: a backlight located behind the optical modulation layer to output light having intensity peaks in wavelengths of 430 nm, 550 nm and 610 nm; a selective reflecting layer located between The optical modulation layer and the backlight and configured to transmit, of a first circularly polarized light component of the incident light, substantially all of light components having wavelengths in first, second and third small regions including wavelengths of 430 nm, 550 nm and 610 nm, respectively, and reflect substantially all of a light component in regions between the first, second and third small regions; a circular polarizer plate including a &lgr;/4 plate and a second polarization plate and located between the selective reflecting layer and the backlight, the circular polarizer plate being configured to transmit the first circularly polarized light component of incident light and to reflect light component of the incident light, which is circularly polarized in a direction opposite to the first circularly polarized light component.