Loading patent…
AssigneesSymetrix Corporation, Matsushita Electronics Corporation
InventorsGota Kano, Yasuhiro Shimada, Shinichiro Hayashi, Koji Arita, Carlos A. Paz de Araujo, Joseph D. Cuchiaro, Larry D. McMillan
Estimating the term…
A thin film of ferroelectric layered superlattice material in a flat panel display device is energized to selectively influence the display image. In one embodiment, a voltage pulse causes the layered superlattice material to emit electrons that impinge upon a phosphor, causing the phosphor to emit light. In another embodiment, an electric potential creates a remanent polarization in the layered superlattice material, which exerts an electric field in liquid crystal layer, thereby influencing the transmissivity of light through the liquid crystal. The layered superlattice material is a metal oxide formed using an inventive liquid precursor containing an alkoxycarboxylate. The thin film thickness is preferably in the range 50-140 nm, so that polarizabilty and transparency of the thin film is enhanced. A display element may comprise a varistor device to prevent cross-talk between pixels and to enable sudden polarization switching. A functional gradient in the ferroelectric thin film enhances electron emission. Two ferroelectric elements, one on either side of the phosphor may be used to enhance luminescence. A phosphor can be sandwiched between a dielectric and a ferroelectric to enhance emission.
An optical display device comprising:
An optical display device having a luminescent layer that is selectively operable for optical effects by influence of ferroelectric electron emission, and a ferroelectric FGM thin film located proximate said luminescent layer for selective operation thereof.
An optical display device comprising a luminescent layer that is selectively operable for optical effects by influence of ferroelectric electron emission, a ferroelectric thin film located proximate said luminescent layer for selective operation thereof, a first switching electrode and a second switching electrode, said ferroelectric thin film located above said first switching electrode, said luminescent layer located on said ferroelectric thin film, and said second switching electrode located on said luminescent layer.
An optical display device comprising a luminescent layer that is selectively operable for optical effects by influence of ferroelectric electron emission, a first switching electrode and a second switching electrode, a bottom ground electrode and a top ground electrode, and a first ferroelectric thin film and a second ferroelectric thin film, said first ferroelectric thin film located between said first switching electrode and said bottom ground electrode, said second ferroelectric thin film located between said top ground electrode and said second switching electrode, and said luminescent layer located between said bottom ground electrode and said top ground electrode.
An optical display device comprising a luminescent layer that is selectively operable for optical effects, a bottom first switching electrode and a bottom second switching electrode, a top first switching electrode and a top second switching electrode, a bottom ferroelectric thin film and a top ferroelectric thin film, and a variable voltage source for providing a voltage bias to said switching electrodes, said bottom ferroelectric thin film located between said bottom first switching electrode and said bottom second switching electrode, said top ferroelectric thin film located between said top second switching electrode and said top-first switching electrode, and said luminescent layer located between said bottom second switching electrode and said top second switching electrode, wherein said voltage bias applied to said top first switching electrode and said bottom second switching electrode is the same, and said voltage bias applied to said top second switching electrode and said bottom first switching electrode is the same.
An optical display device comprising a luminescent layer that is selectively operable for optical effects, a bottom switching electrode, a bottom ground electrode, a top switching electrode, a ferroelectric thin film, a dielectric thin film, a variable high-voltage alternating current source for providing a voltage bias to said top switching electrode, and a variable low-voltage source for providing a voltage bias to said bottom switching electrode, said ferroelectric thin film located between said bottom switching electrode and said bottom ground electrode, said luminescent layer located between said ferroelectric thin film and said dielectric thin film, and said top switching electrode located on said dielectric thin film.
A method of fabricating a ferroelectric FGM thin film in a ferroelectric flat panel display, comprising steps of:
Dependencies are inferred from the claim text.