Liquid crystal color display device
First 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;
space="preserve" listing-type="equation">T.sub.R η
.sub.R M.sub.R ;
T.sub.B η
.sub.B N.sub.B =1;
0.5˜
1.5 (I)
space="preserve" listing-type="equation">T.sub.B η
.sub.B M.sub.B ;
T.sub.G η
.sub.G M.sub.G =1;
0.5˜
1.5 (II)
space="preserve" listing-type="equation">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 TR, TG, and TB 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 MR, MG, and MB are the amounts (weight ratio) of the red, green, and blue fluorescent materials, respectively, contained in said fluorescent layer.
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Abstract
A color display device has a liquid crystal unit for passing therethrough electromagnetic radiation dependent on image information. The color display device also has a light source including electroluminescent materials or fluorescent materials. The electroluminescent materials and the fluorescent materials are essentially the same, but have different light-emitting mechanisms, i.e., electroluminescence and fluorescence. The light source with the electroluminescent materials is used singly or in combination with a color filter and the liquid cystal unit. The light source with the fluorescent materials is combined with a color filter and the liquid crystal unit. When the light source with the fluorescent materials is used, the amounts of the fluorescent materials for emitting lights in red, green, and blue, the light-emitting efficiencies of the fluorescent materials, and the transmissivities of the color filter for the lights in red, green, and blue are determined to meet certain conditions.
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Citations
7 Claims
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1. A liquid crystal color display device comprising:
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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;
space="preserve" listing-type="equation">T.sub.R η
.sub.R M.sub.R ;
T.sub.B η
.sub.B N.sub.B =1;
0.5˜
1.5 (I)
space="preserve" listing-type="equation">T.sub.B η
.sub.B M.sub.B ;
T.sub.G η
.sub.G M.sub.G =1;
0.5˜
1.5 (II)
space="preserve" listing-type="equation">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 TR, TG, and TB 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 MR, MG, and MB are the amounts (weight ratio) of the red, green, and blue fluorescent materials, respectively, contained in said fluorescent layer. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification