Arrangement for brightness gains of passive display units

Radiant energy – Ionic separation or analysis – Static field-type ion path-bending selecting means

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2504671, 350 961, G02F 1133

Patent

active

043646409

ABSTRACT:
A device for capturing, guiding and concentrating light for coupling out of an outlet window comprising at least one flexible foil of synthetic material containing a fluorescent substance for converting ambient light into fluorescent light and means for forming an outlet for the fluorescent light. The device can include a second and/or a third flexible foil so that light going to the outlet windows passes through the second and third foils. In one embodiment, a pair of foils are arranged behind a liquid crystal display and each foil contains fluorescent material having a polarization plane extending at right angles to each other, an optical active layer is placed between the two foils which will rotate the direction of polarization and the means for forming an outlet is disposed on the outer surface of the one foil opposite from the liquid crystal cell so that a viewer sees the light modulated by the cell.

REFERENCES:
patent: 4142781 (1979-03-01), Baur et al.
patent: 4236791 (1980-12-01), Krueger et al.
patent: 4240711 (1980-12-01), Baur et al.
patent: 4264124 (1981-04-01), Greubel et al.

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