Stc, Inc

Merck Patent Gesellschaft MIT Beschrankter Haftung

The Secretary of State for Defence in Her Britannic Majesty's Government

The Secretary of State for Defence in Her Britannic Majesty's Government of the United Kingdom of Great Britain and Northern Ireland

Standard Telephones and Cables Public Limited Company

The Secretary of State for Defence in Her Majesty's Government of the

Screen Technology Limited

Anthony Bernard Davey

William A Crossland

Matthew F Bone

Peter J Ayliffe

Ian David Springle

Vincent Glenn Geake

David Coates

Ian Charles Sage

David I Bishop

Neil Collings

Paul Andrew Bayley

Christopher J Walker

Johannes K Zelisse

Timothy M Coker

Andrew D Pearson

A liquid crystal display of the UV-phosphor type comprises a light source,for producing activation light at a predetermined narrow range of UV wavelengths, a collimator,for directing the activation light in parallel in a predetermined direction, a LC cell,formed from an array of pixels, a photoluminescent screen (,) on the cell arranged to emit a visible output when struck by the narrow-band excitation light passing through the cell, and a drive circuit for addressing the LC cell in a multiplexed manner. The direction of the light and the thickness of the cell are chosen to give the best contrast ratio for the liquid crystal. Such an effect is only possible when monochromatic, collimated light is used, which for a normal display is not practical. With the phosphor-emitter configuration, on the other hand, it is ideal, and as a result without loss of contrast a much lower range of drive voltages, and hence a much greater multiplexing capability for passive-matrix displays, can be used while preserving full viewing-angle properties of the display.

Liquid crystal display

A display device includes a shutter layer of liquid-crystal material arranged in cells to shutter input light selectively, a cover layer,on the shutter layer, and a set of phosphors,on the cover layer, corresponding to the cells, to be activated by the input light and provide the display image. To prevent crosstalk the active cell areas,defined by the electrode overlaps are smaller than the corresponding phosphors. This prevents crosstalk between cells even when input light that is not fully collimated is used and also allows space for thicker and/or broader electrodes,leading to the cells, reducing resistance, and for other components such as TFTs.

Liquid crystal cell

Liquid crystal display using circular polarized light and light emitting

Light modulator including a collimator comprising an interference filter

Relaxation effects of a uniform mode ferroelectric liquid crystal cell with obliquely evaporated alignment layers, characterized by the reduction in apparent tilt angle consequent upon removal of a switching stimulus, are eliminated by a poling treatment that typically comprises the application of a relatively low frequency (c. 500 Hz) relatively large amplitude (c. 60 volts peak-to-peak) electric potential difference across the thickness of the liquid crystal layer.

Ferroelectric liquid crystal cells

Bistable switching between clear and scattering states is provided by a liquid crystal cell whose liquid crystal layer is constituted by a random orientation planar aligned ferroelectric smectic exhibiting a pitch length comparable with the wavelength of visible light.

Liquid crystal cell utilizing a ferroelectric liquid crystal having a

Smectic A liquid crystal compositions

Bistable operation of ferroelectric liquid crystal smectic I* or smectic F* display cells is disclosed which uses a greater liquid crystal layer thickness than is achievable with smectic C* material while yet retaining bistability of operation.

Ferroelectric liquid crystal cells having a helical liquid crystal

A method of addressing a matrix addressed ferroelectric liquid crystal cell is described that uses parallel entry of balanced bipolar data pulses on one set of electrodes to co-operate with serial entry of unipolar strobe pulses on the other set of electrodes. Data entry is preceded with blanking (erasing) pulses applied to the strobe lines. The polarity of the strobing and blanking pulses is periodically reversed to maintain charge balance in the long term.

Addressing liquid crystal cells using bipolar data strobe pulses

Bistable operation of ferroelectric liquid crystal smectic I* or smectic F* cells is disclosed which uses a greater liquid crystal layer thickness than is achievable with smectic C* material while yet retaining bistability of operation. One or more such cells are employed in two-dimensional information processing apparatus.

Two-dimensional optical information processing apparatus

Addressing liquid crystal cells using unipolar strobe pulses

A laser beam addressed smectic display in which the laser beam is used to write clear tracks in an optically scattering field employs an anisotropic conductivity dopant in the liquid crystal filling so that the cell can be electrically set into the scattering state by means of dynamic scattering effects. This requires the use of a laser light absorbing dye that is not only photochemically stable, but also stable against the effects of the relatively high fields and currents present when the cell is being set into the scattering state.

Laser addressed smectic displays

Growing community of inventors

Bishops Stortford, United Kingdom

Anthony Bernard Davey