# US 5,349,454 A · Plasma addressing electro-optical device having invertor circuit connected to anodes > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,349,454 A - Document ID: US5349454A - Status: Granted - Kind: A - Application number: 08/050,647 - Filed: 1993-04-22 - Granted: 1994-09-20 - Earliest claimed: 1992-04-24 - Assignees: Sony Corporation - Inventors: Jun Iwama - Web page: https://patentgrep.com/patent/US5349454A ## CPC - G02F 1/13334: {Plasma addressed liquid crystal cells [PALC]} - G09G 3/3662: {using plasma-addressed liquid crystal displays} - G02F 1/133374: {for displaying permanent signs or marks} - G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS - G09G: ARRANGEMENTS OR CIRCUITS FOR CONTROL OF INDICATING DEVICES USING STATIC MEANS TO PRESENT VARIABLE INFORMATION (arrangements for transferring data between digital computers and displays G06F3/14; static indicating arrangements comprising an association of a number of separate sources or light control cells G09F9/00; static indicating arrangements comprising integral associations of a number of light sources H01J, H01K, H10H, H05B33/12; scanning, transmission or reproduction of documents or the like, e.g. facsimile transmission, details thereof H04N1/00) ## Abstract A plasma addressing electro-optical device which can be driven at a comparatively low voltage is disclosed. A plurality of signal electrodes are formed on an inner surface of an upper glass substrate. A plurality of plasma electrodes as anodes and cathodes are formed on an inner surface of a lower glass substrate and extend perpendicularly to the signal electrodes. A liquid crystal layer is filled between the upper glass substrate and an intermediate dielectric sheet. A plasma chamber is provided between the dielectric sheet and the lower glass plate, and ionizable gas is enclosed in the plasma chamber. The gas is selectively ionized by discharge between the cathodes and the anodes, and taking the discharge regions, in which the ionized gas exists locally, as scanning units, the liquid crystal layer positioned at intersecting positions between the signal electrodes and the discharge regions is driven. A driver circuit for such driving includes an invertor circuit which inverts an image signal to be applied to the signal electrodes and a potential to the anodes at a time with reference to a potential of a substantially middle level of a driving voltage for the signal electrodes. ## Claims ### Claim 1 A plasma addressing electro-optical device, comprising: a first substrate having a plurality of first electrodes arranged substantially in parallel to each other on a major surface thereof; a second substrate having a plurality of second electrodes to define addressing units each including an anode and a cathode in pair to thereby define overlapping regions of the first electrodes and the addressing units; an electro-optical material layer positioned between said first and second substrates; a discharge chamber formed between said electro-optical material layer and said second substrate and containing ionizable gas; a signal generating circuit for providing a signal to the first electrodes, said signal being inverted on the basis of a predetermined potential; and means for providing an anode potential which is inverted in synchronism with the inversion of the signal. ### Claim 2 (depends on 1) A plasma addressing electro-optical device as claimed in claim 1, wherein the predetermined potential is a substantially middle potential of a driving voltage for said electro-optical material layer. ### Claim 3 (depends on 1) A plasma addressing electro-optical device as claimed in claim 1, further comprising a dielectric material layer disposed between said electro-optical material layer and said discharge chamber to isolate said electro-optical material layer from said ionizable gas. ### Claim 4 (depends on 1) A plasma addressing electro-optical device as claimed in claim 1, further comprising a plurality of barrier rib elements formed on said second electrodes so as to support said dielectric material layer thereon. ### Claim 5 (depends on 1) A plasma addressing electro-optical device as claimed in claim 1, wherein the inversion of the signal occurs for each frame. ### Claim 6 (depends on 1) A plasma addressing electro-optical device as claimed in claim 1, wherein said electro-optical material layer contains liquid crystal therein. ### Claim 7 (depends on 1) A plasma addressing electro-optical device as claimed in claim 1, wherein said overlapping regions define a dimension of a display element. ### Claim 8 A method of driving an electro-optical display device of the type which includes a plurality of signal electrodes extending in parallel along a column direction, a plurality of addressing units activated by plasma discharge and each having an anode and a cathode for selectively ionizing gas, and a plurality of display elements arranged at intersections of said signal electrodes and said addressing units, said method comprising the steps of: supplying a signal, which is inverted with respect to a predetermined potential, to said signal electrodes; and applying an anode potential, which is inverted in synchronism with the inversion of the signal, to the anodes. ### Claim 9 (depends on 8) A method as claimed in claim 8, wherein said predetermined potential is a substantially middle potential of a driving voltage for said electro-optical display device. ### Claim 10 (depends on 8) A method as claimed in claim 8, wherein the inversion occurs for every frame.