04662720 is referenced by 49 patents and cites 15 patents.

The present invention relates to use of liquid crystal material encapsulated in a containment medium to produce a controlled colored or multicolored output, for example, in response to the application, removal and variation in an electric field. A non-pleohroic dye is imbibed in the containment medium itself. Different color dyes may be placed at different areas of the encapsulated liquid crystal structure to achieve different color outputs. In the imbibing process water soluble dye is applied to the exposed surface of a water base containment medium of already encapsulated liquid crystal material. Humidity is applied, and the dye imbibes into a proximate area of the containment medium preferably going into solution therewith. Incident light impinging on the encapsulated liquid crystal material, which is mounted on, in, or with respect to a support medium, is isotropically scattered in the absence of an electric field, and using the principle of total internal reflection (or optical interference or both) a relatively large part ofthe isotropically scattered light in the support medium is reflected back to illuminate the scattering liquid crystal material, which isotropically scatters such light again, thus increasing the optical path through the dyed material and, therefore, the coloring of the light traveling such increased path. Light scattered back to the viewing direction out of the support medium causes the liquid crystal material to appear relatively bright and colored as compared to the background where there is no liquid crystal material or where the liquid crystal material is in parallel alignment in field-on condition.

Title
Colored encapsulated liquid crystal devices using imbibition of colored dyes and scanned multicolor displays
Application Number
6/480461
Publication Number
4662720
Application Date
March 30, 1983
Publication Date
May 5, 1987
Inventor
James L Fergason
Kent
OH, US
Agent
Renner Otto Boisselle & Lyon
Assignee
Manchester R & D Partnership
OH, US
IPC
G02F 1/13
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