Polymer dispersed liquid crystal (PDLC) display element for use

Details Polymer dispersed liquid crystal (PDLC) display element for use Polymer dispersed liquid crystal (PDLC) display element for use

1997-02-12

1999-11-30

Wu, Shean C.

Compositions

Liquid crystal compositions

2522991, 2522995, 349 10, 349 88, 349183, 359630, 345 87, 345 92, C09K 1902, C09K 1904, G02F 1133

Patent

active

059936894

ABSTRACT:
A polymer dispersed liquid crystal (PDLC) display element for use in an electronic apparatus wherein the display element operates in a PDLC mode or reverse PDLC mode providing for reduction of visual display haze, improved display contrast. The particular medium includes a liquid crystal portion and a polymer portion and may include a chiral component. In cases where visual display haze and contract is a particular problem in the utility of the reverse PDLC display element, such as in the case where the display element is combined with a solar battery, a sufficient amount of dichroic dye is added to the liquid crystal portion of the medium, and, further, a compound showing no fluorescence emission with respect to a liquid crystal portion, or a polymer or a chiral polymer precursor portion of the medium, is employed. The resulting electronic apparatus can, therefore, incorporate a reverse PDLC type display element in combination with a solar battery or other component that affects display quality in such elements to improve the overall visual quality and contrast in the display rendering the display more useful in more miniaturized applications.

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