Liquid crystal color display panel
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsHiroshi Kawarada, Toshio Tatsumichi, Yasuo Wakahata, Mitsuyoshi Hamanaka, Tamotsu Kajitani
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Abstract
The present invention provides a liquid crystal color display panel of improved positive contrast by utilizing the so-called Guest-Host effect.
Claims11
A liquid crystal color display panel including two transparent electrode-mounted substrates joined together with a gap therebetween, a displaying material composed of a system formed by dissolving optically active materials (chiral compounds) and dichroic dyes in nematic liquid crystals having negative dielectric anisotropy, the displaying material being enclosed in said gap for utilization of a change in the degree of light absorption of said displaying material upon application of a voltage across the electrodes, said display panel comprising one of said substrates being such that it has been given tilted perpendicular alignment preparation so as to allow liquid crystal and dichroic dye molecules to be tilt-aligned, in the vicinity of said one substrate, in a given direction at a tilt angle .alpha. meeting the relationship 0<.alpha..ltoreq.4.degree. relative to a normal line to said one substrate, the other of said substrates being such that it has been given perpendicular alignment preparation so as to allow liquid crystal and dichroic dye molecules to be aligned, in the vicinity of said other substrate, without tilting from a normal line to said other substrate, said displaying material being such that the relationship between its thickness d as a material layer and its helical pitch p is d/p<1.
Dependencies are inferred from the claim text.