Method of operating a plasma addressed liquid crystal display device to reduce sputtering
AssigneeTektronix, Inc.
InventorsThomas S. Buzak, Kevin J. Ilcisin
Life of this patent
Estimating the term…
Abstract
A PALC panel is operated by driving a channel electrode to a positive voltage relative to the data drive electrode to initiate an AC discharge in the channel and thereafter maintaining a sufficient voltage between the channel electrodes to sustain a DC discharge in the channel.
Claims12
An improved method of operating a PALC panel which comprises a channel member defining at least one channel, an ionizable gas in the channel, channel electrodes exposed to the ionizable gas in the channel, a cover sheet over the channel, a data drive electrode in crossing relationship with the channel and isolated from the channel by the cover sheet, and a layer of electro-optic material between the data drive electrode and the cover sheet, the method comprising initiating an AC discharge in the channel by driving at least one of the channel electrodes to a positive voltage relative to the data drive electrode, and thereafter maintaining a sufficient voltage between the channel electrodes to sustain a DC discharge in the channel.
An improved PALC panel of the kind comprising a channel member defining at least one channel, an ionizable gas in the channel, channel electrodes exposed to the ionizable gas in the channel, a cover sheet over the channel, a data drive electrode in crossing relationship with the channel and isolated from the channel by the cover sheet, and a layer of electro-optic material between the data drive electrode and the cover sheet, wherein the improvement resides in a layer of transparent electron-emissive material on the underside of the cover sheet.
An improved PALC panel of the kind comprising a channel member defining at least one channel, an ionizable gas in the channel, channel electrodes exposed to the ionizable gas in the channel, a cover sheet over the channel, a data drive electrode in crossing relationship with the channel and isolated from the channel by the cover sheet, and a channel electrode driver which drives at least one of the channel electrodes to a voltage such as to initiate a discharge in the channel, wherein the improvement resides in that the channel electrode driver drives at least one of the channel electrodes to a positive voltage relative to the data drive electrode, said positive voltage being of sufficient magnitude to initiate an AC discharge in the channel, and thereafter maintains a sufficient voltage between the channel electrodes to sustain a DC discharge in the channel.
A PALC panel comprising a channel member defining at least one channel, an ionizable gas in the channel, channel electrodes exposed to the ionizable gas in the channel, a cover sheet over the channel, a data drive electrode in crossing relationship with the channel and isolated from the channel by the cover sheet, a layer of electro-optic material between the data drive electrode and the cover sheet, and a coating of transparent electron-emissive material on an interior surface of the channel.
An improved PALC panel of the kind comprising a channel member defining at least one channel, an ionizable gas in the channel, channel electrodes exposed to the ionizable gas in the channel, a cover sheet over the channel, a data drive electrode in crossing relationship with the channel and isolated from the channel by the cover sheet, and a layer of electro-optic material between the data drive electrode and the cover sheet, wherein the improvement resides in that one of the channel electrodes is composed of a metal busbar extending longitudinally of the channel and a strip of transparent conductive material projecting laterally of the metal busbar.
Dependencies are inferred from the claim text.