Display having positive control mode and negative control mode permitting address according to matrix form

Abstract

A method of making display having a display area capable of displaying a plurality of characters in a background, the characters including a plurality of segments, includes the steps of: providing a substrate; forming a first patterned conductor layer on the substrate having electrically separate areas defining character regions, the first patterned conductor being substantially coextensive with the display area; depositing a layer of light modulating material over the first patterned conductor layer; forming a second patterned conductor layer over the layer of light modulating material and having electrically separate areas defining the segments of the characters and the background, the second patterned conductor being substantially coextensive with the display area; depositing a dielectric layer over the second patterned conductor layer, the dielectric layer defining holes over each segment and the background area of the second patterned conductor layer; and forming a third patterned conductor layer located over the dielectric layer defining a plurality of conductors connected to the areas defining the character segments in the second patterned conductor and the background area through the holes in the dielectric layer; at least one of the conductors being connected to a segment in more than one character, whereby the display may be addressed in a matrix fashion by electrically addressing the first and second plurality of contacts, and may be driven in a positive or negative mode.

Description

technical field [0001] The present invention relates to a display with two modes of operation, addressable by a passive matrix, in particular, to a cholesteric (chiral nematic) liquid crystal display and its electrical drive mechanism, and to a segment with at least two modes of operation monitor. Background technique [0002] Referring to FIG. 4C , the prior art segmented display 1 includes a segmented area that can be written as an ON state such as segment 6 , or an OFF state such as segment 3 . Since there are no electrodes on the non-segmented area 4, the non-segmented area 4 is not addressable. Regardless of whether the segmented area is ON or OFF, the non-segmented area 4 is displayed differently from the segmented area. This produces an undesired image on the display 1 . [0003] US 5,636,044, Yuan et al., published June 3, 1997, discloses a segmented display using cholesteric liquid crystals having two substrates. The first substrate is divided into a segmented r...

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However, the device can only represent one type of image,

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