Matsushita Electric Industrial Co., Ltd.

Other

Matsushita Electronic Industrial Co., Ltd

Plasmaco, Inc.

Matsushita Electric Industries, Inc.

Robert G Marcotte

Norifusa Isobe

William S Schindler

The invention contained herein provides solid-state breakover conduction illumination devices, displays and driving methods. Illumination devices may be fabricated as co-packaged devices or integrated devices using in-organic or organic illumination elements. AC breakover conduction displays are embodied in both small, tightly-integrated configurations as well as, large area discrete implementations. Driving methods employ initialization and resetting methods for subfield based operation; taking advantage of the stable high speed characteristics of solid-state breakover devices such as DIACs. A full-color high-resolution DIAC based display is presented.

Breakover conduction illumination devices and operating method

The invention contained herein provides electrical circuits and driving methods to operate a memory cell comprising a capacitance coupled to a breakover conduction switch such as a thyristor, DIAC or one or more complementary transistor pairs. The memory cell comprises a cell capacitance for storing a memory state and for capacitively coupling an applied voltage to the switch. During operation, pulses are applied to write, read or maintain the cell's memory state. An illumination cell comprises an LED, OLED or electroluminescent material in series with each memory cell. Breakover conduction charge passes through the switch and the emissive element to charge the cell capacitance. A memory array of breakover conduction memory cells may be organized into rows and columns for reading and writing an addressable array memory cells. An organic light emitting display memory array may be fabricated using organic light emitting devices and/or materials.

Memory based illumination device

A method of controlling electrodes of a pixel in a plasma display panel. The method includes applying a first voltage to a first electrode of the pixel during a sustain discharge involving the first electrode, and applying a second voltage to a second electrode of the pixel. The first voltage and the second voltage have a relationship that encourages the sustain discharge to extend to the second electrode.

Plasma display with split electrodes

There is provided a plasma display. The plasma display includes a circuit having a first input that receives a first waveform, a second input that receives a second waveform, an output that provides a driving waveform for an electrode of a pixel in the plasma display, and a switching sub-circuit. The switching sub-circuit (i) routes the first waveform from the first input to the output during a first portion of a setup period to initialize the pixel for an addressing operation, and (ii) routes the second waveform from the second input to the output during a second portion of the setup period.

A method for controlling electrodes in a plasma display panel (), includes applying a voltage Ve to a sustain electrode during a setting up of the sustain electrode () for an addressing operation, where Ve&#x3c;Ve. Another method includes a) applying Veto the sustain electrode during the addressing, where the sustain electrode is associated with a scan electrode () in an electrode pair, and b) applying a voltage Vsto the scan electrode during a discharging of the electrode pair after the addressing, where Ve&#x3c;Vs

Suppression of vertical crosstalk in a plasma display panel

There is provided a method of controlling electrodes of a pixel in a plasma display panel. The method includes applying a first voltage to a first electrode of the pixel during an addressing discharge involving the first electrode, and applying a second voltage to a second electrode of the pixel. The first voltage and the second voltage have a relationship that discourages the addressing discharge from extending to the second electrode.

A circuit for providing a pulse to drive a capacitive load comprises (a) a first inductive component that influences both a transition time of a rising edge of the pulse and a transition time of a falling edge of the pulse, and (b) a second inductive component that influences one of the transition time of the rising edge and the transition time of the falling edge so that the rising edge and the falling edge are asymmetrical.

Energy recovery circuit for driving a capacitive load

There is provided a method for controlling sustain electrodes in a plasma display panel (PDP). The method includes enabling a first sustain electrode to produce an addressing discharge, and disabling a second sustain electrode when the first sustain electrode is producing the addressing discharge. The first sustain electrode is adjacent to the second sustain electrode.

An AC plasma display panel (PDP) incorporating the invention includes opposed substrates with an enclosed dischargeable gas positioned therebetween; plural elongated address electrodes positioned on one substrate; and plural scan electrode structures positioned on a second opposed substrate and orthogonally oriented to the address electrodes. A plurality of sustain electrode structures are positioned in parallel configuration and interdigitated with the scan electrode structures. Each sustain electrode structure and scan electrode structure is configured as an elongated conductive layer with plural apertures positioned therein. The elongated conductive layer for each sustain electrode structure and each scan electrode structure may be a cross-hatched conductor pattern or a plurality of parallel conductors connected by shorting bars. Moir&eacute; effects of the shorting bars are negated by widely spacing the bars and minimizing their length within a pixel site.

AC plasma display with apertured electrode patterns

An AC plasma display panel (PDP) incorporating the invention includes opposed substrates with an enclosed dischargeable gas positioned therebetween; plural elongated address electrodes positioned on one substrate; and plural scan electrode structures positioned on a second opposed substrate and orthogonally oriented to the address electrodes. A plurality of sustain electrode structures are positioned in parallel configuration and interdigitated with the scan electrode structures. Each sustain electrode structure and scan electrode structure is configured as an elongated conductive layer with plural apertures positioned therein. The elongated conductive layer for each sustain electrode structure and each scan electrode structure may be a cross-hatched conductor pattern or a plurality of parallel conductors connected by shorting bars.

An AC PDP incorporating the invention includes a first substrate having plural elongated address electrode structures, which include sets of color phosphors. A second substrate is opposed to the first substrate and encloses a dischargeable gas therebetween. The second substrate supports a plurality of scan loops and sustain loops that are interdigitated with the scan electrode loops. Gas discharges occur at intersections between address electrodes and both traces of a scan loop to which a scan voltage is applied and a single side of each adjacent sustain loop to which a sustain voltage is applied. This action creates wall charges at each of two subpixel sites for each color subpixel. Thereafter, sustain signals applied to sustain and scan electrode loops causes discharges at each of the dual subpixel sites at which wall charges exist. Electrically isolated contrast enhancement bars are placed within scan and sustain electrode loops and act to block ambient light from reflecting off the phosphor layer. Accordingly, ambient room contrast ratio of the PDP is enhanced due to the reduced reflection of the room light off the phosphor. Brightness reduction is minimized by the contrast bars being placed in the center of the loops where light is not produced.

AC plasma display with dual discharge sites and contrast enhancement bars

An AC PDP incorporating the invention includes a first substrate having plural elongated address electrode structures, which include sets of color phosphors. A second substrate is opposed to the first substrate and encloses a dischargeable gas therebetween. The second substrate supports a plurality of scan electrode structures that are orthogonally oriented to the address electrode structures. Each scan electrode structure includes a scan loop with a first trace and a second trace and a plurality of sustain electrode structures that are interdigitated with the scan electrode structures, each sustain electrode structure including a first trace and a second trace. Address circuitry selectively applies address signals to the address electrode structures and scan circuitry applies a scan voltage to the scan electrode structures. Gas discharges occur at intersections between address electrode structures and both traces of a scan loop to which the scan voltage is applied, so as to create wall charges and dual subpixel sites for each color subpixel. Thereafter, a sustain signal applied to the sustain electrode causes discharges at each of the dual subpixel sites at which wall charges exist. Increased light and resolution are the result of the dual subpixel discharge sites.

Large-area color AC plasma display employing dual discharge sites at

An energy efficient driver circuit for driving a display panel having panel electrodes and panel capacitance includes an inductor means coupled to the panel electrodes; a driving voltage source; a voltage supply for providing a supply voltage of a magnitude which is greater than the driving voltage; a first switch device for selectively coupling the driving voltage to the inductor in response to a rising input signal transition, the input signal transition commencing a first state wherein a first current flow occurs through the inductor to charge the panel capacitance, the inductor causing the panel electrodes to rise to a voltage in excess of the driving voltage, at which point the first current flow reaches zero; and a second switch device for selectively coupling the voltage supply to the inductor and panel electrodes. A switch control is responsive to current flow in the inductor and is operative during the first state to initially maintain the second switch device in an open condition, and thereafter, in response to signals derived from the inductor, to cause a closure of the second switch device at a time which enables said second switch device to be fully conductive when the first current flow reaches zero, whereby the supply voltage source during a succeeding second state supplies current to both the panel electrodes and flyback current to said inductor. A like circuit is similarly operational on a falling input signal transition.

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New Paltz, NY, United States of America

Robert G Marcotte