G - Physics – 02 – F
Patent
G - Physics
02
F
345/8
G02F 1/133 (2006.01) C09K 19/54 (2006.01) G02F 1/1334 (2006.01) G02F 1/137 (2006.01)
Patent
CA 1293316
ABSTRACT The present invention relates to use of liquid crystal material encapsulated in a containment medium to produce a controlled colored output, for example, in response to the application, removal and variation in an electric field. In one embodiment a non-pleochroic dye is in the containment medium itself and in another embodiment the non-pleochroic dye is in the liquid crystal material itself; and in both cases the dye preferably is fluorescent or a combination of fluorescent and non- fluorescent, and the object is to color light and/or to whiten or to brighten the light emitted out from a display embodying the invention. 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 of the 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, whitening and/or brightening 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, i.e. aligned with respect to an electric field, and, thus, substantially transmissive. Original incident light where there is no liquid crystal material, that light which is isotropically scattered toward the back or non-viewing side of the display and within a certain cone or solid angle, and that light passing through aligned (field-on) liquid crystal material will tend not to be totally internally reflected; such light will pass through the support medium and may be absorbed by a remote black or colored material. Light amplification type of operation may be effected in a sense because the dye is a fluorescent one that fluoresces, isotropically emitting light in response to incident light for possibly other radiation).
540256
Manchester R. & D. Limited Partnership
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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