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Christiansen Effect Display

IP.com Disclosure Number: IPCOM000035372D
Original Publication Date: 1989-Jul-01
Included in the Prior Art Database: 2005-Jan-28
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Hoffman, HS: AUTHOR

Abstract

If in an electrolyte cell with insulated electrodes a voltage attracts ions to become a wall charge, the remaining solution is depleted of ions to provide a change of index. If this cell is a Christiansen effect cell, then voltage rather than temperature can alter the scattering properties. Ambient light can enter such a cell through a polarizer and quarter wave plane, then be reflected out by the electrodes on the other side of the cell. Depolarized light from scattering can escape, but the unscattered reflection will be blocked by the effective crossed polarizers.

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Christiansen Effect Display

If in an electrolyte cell with insulated electrodes a voltage attracts ions to become a wall charge, the remaining solution is depleted of ions to provide a change of index. If this cell is a Christiansen effect cell, then voltage rather than temperature can alter the scattering properties. Ambient light can enter such a cell through a polarizer and quarter wave plane, then be reflected out by the electrodes on the other side of the cell. Depolarized light from scattering can escape, but the unscattered reflection will be blocked by the effective crossed polarizers.

Color filters for individual pels combined with the appropriate voltage can provide an array of pels for a color display panel. An active matrix with lines switchable to multiple voltages can supply each pel with its voltage and memory capability. If greater brightness is required, the ambient light can be augmented by lamps at the sides of the panel shining into the panel at high angles of incidence.

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