Liquid crystal color display device

Claim 1

A liquid crystal color display device comprising: a liquid crystal unit having transparent pixel electrodes for passing therethrough an electromagnetic radiation dependent on image information; a fluorescent light source including a fluorescent body comprising a fluorescent layer composed of a mosaic arrangement of fluorescent materials capable of emitting fluorescent lights in red, green and blue, said fluorescent layer emitting said fluorescent lights upon irradiation by electromagnetic radiation; a color filter arranged between said liquid crystal unit and said light source and composed of pixel filter elements in red, green, and blue for passing therethrough the lights emitted from said fluorescent materials; wherein the mosaic arrangement of fluorescent materials, the pixel filter elements of said color filter and the pixel electrodes of the liquid crystal unit are arranged so that the fluorescent materials for emitting lights in red, green and blue respectively correspond to respective pixel filter elements which in turn correspond to respective pixel electrodes; and said fluorescent layer being formed to meet the following formulas: T.sub.R η.sub.R M.sub.R :T.sub.B η.sub.B N.sub.B =1:0.5˜1.5 (I) T.sub.B η.sub.B M.sub.B :T.sub.G η.sub.G M.sub.G =1:0.5˜1.5 (II) T.sub.G η.sub.G M.sub.G :T.sub.R η.sub.R N.sub.R =1:0.5˜1.5 (III) where T R , T G , and T B are the transmissivities of the red, green, and blue pixel filter elements, respectively, of said color filter, η R , η G , and η B are the light-emitting efficiencies of said red, green, and blue fluorescent materials, respectively, and M R , M G , and M B are the amounts (weight ratio) of the red, green, and blue fluorescent materials, respectively, contained in said fluorescent layer.