| 摘要 |
PURPOSE:To display a color video which is bright and has excellent contrast in respective colors by using a twisted nematic type (TN) liquid crystal as a light valve and using a monochromatic excitation light source. CONSTITUTION:The light source 13 which radiates approximately the single wavelength light of a blue or UV part is used. R, G, B phosphor layers 11 which are made to emit light or R, G and B respectively by the excitation light from the light source 13 are used. A TN liquid crystal cell 14 is constituted by horizontally orienting the nematic liquid crystal 4 having positive DELTAepsilon between the electrode surfaces of a pair of transparent substrates 2, 8 provided with transparent conductive films. The voltage of R-times the off-cells is impressed to the on-cells when the number of scanning lines is N if the matrix panel is subjected to line sequential driving by an ordinary voltage averaging method. Since the optical rotatory powers of both picture elements differ, the intensity of the excitation light source passing the 2nd polarizing plate 9 varies. The emission intensity from the phosphor layers is thereby made different and the contrast is obtd.
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