| 摘要 |
PROBLEM TO BE SOLVED: To facilitate maintenance and to reduce running cost by disposing correcting filters between a liquid crystal panel and fluorescent lamps of a hot cathode type for having the liquid crystal panel irradiate with light within a range a specific color temperature and correcting the color temperature of the fluorescent lamps. SOLUTION: When the fluorescent lamps 4 are lighted, the light from the fluorescent lamps 4 is collected towards the correction filters 3 by reflection mirrors 6. The light past the correction filters 3 is changed in direction by a light transmission plate 8 and is diffused by a diffusion plate 10 via a prism sheet 19 to the uniform light with which the liquid crystal panel 2 is irradiated. irradiates The liquid crystal panel with a light of 4,500 to 7,100 deg.K in color temperature is irradiated with the lamps 4 of a three-wavelength type. When the light is corrected in the color temperature to 8,000 to 11,000 deg.K by the correction filters 3 and the white balance of the light to be cast to the liquid crystal panel 2 is corrected to a prescribed region, the light after the passage through the liquid crystal panel 2 makes it possible to obtain videos of normal color tones equal to the color tones of a CRT.
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