THIN BACKLIGHT SYSTEM AND LIQUID CRYSTAL DISPLAY DEVICE USING SAME

摘要

According to a conventional backlight device for use in a thin full-color display device in which pixels are subjected to a color separation by colored lights, a large chromatic aberration occurs, thereby causing a deterioration in image quality. A thin backlight system in accordance with the present invention includes: a light emitting section (1) for emitting lights that have different dominant wavelengths; and a plurality of light transmitting parts (4) arranged in a predetermined manner, the thin backlight system deflecting the lights and then converging the lights on the plurality of light transmitting parts (4), said thin backlight system, further including: an imaging optical system (3) provided so as to face surfaces, of the plurality of light transmitting parts (4), on which the lights are to be converged, the imaging optical system (3) (i) having a plurality of identical lenses arranged in a vertical and/or a horizontal direction at a pitch found by multiplying a pitch at which the plurality of light transmitting parts (4) are arranged in a vertical and/or a horizontal direction by the number of types of the different dominant wavelengths and (ii) being configured so as to converge the lights from the light emitting section (1) on light transmitting parts (4) to which the different dominant wavelengths of the lights correspond; and an irradiating optical system (2) provided so as to face (a) the light emitting section (1) and (b) a surface, of the imaging optical system (3), through which the lights enter the imaging optical system (3), the irradiating optical system (2) being configured such that (I) the lights from the light emitting section (1), which lights have the different dominant wavelengths, are deflected by the irradiating optical system (2) by at least being reflected by the irradiating optical system (2) so as to be separate from each other, (II) the lights thus deflected leave the irradiating optical system (2) so as to travel in substantially parallel to a normal to each of the plurality of light transmitting parts (4) and (III) the lights enter the plurality of identical lenses of the imaging optical system (3) through a surface, of the imaging optical system (3), which is opposite to the plurality of light transmitting parts (4).