Browse Prior Art Database

Short Cycle Erase for Video Mode Plasma Display

IP.com Disclosure Number: IPCOM000040385D
Original Publication Date: 1987-Nov-01
Included in the Prior Art Database: 2005-Feb-02
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Criscimagna, TN: AUTHOR [+4]

Abstract

If a CRT adapter drives a memory type of plasma panel, the vertical retrace can be used to erase all pels (picture elements) on a first scan line. This is followed by selective writing on the line and erase of the adjacent line. This process is repeated through the entire panel for a complete frame. The memory feature of the panel maintains the illumination of lit pels until the erase of the next frame, providing infinite persistence unless an update of data in a later frame leaves the pel erased at the selective write time. In order to provide high-speed operation, it is necessary to maintain fast update times of the individual pels. The erase and write cycles should be short and, if possible, combined with sustain.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 63% of the total text.

Page 1 of 1

Short Cycle Erase for Video Mode Plasma Display

If a CRT adapter drives a memory type of plasma panel, the vertical retrace can be used to erase all pels (picture elements) on a first scan line. This is followed by selective writing on the line and erase of the adjacent line. This process is repeated through the entire panel for a complete frame. The memory feature of the panel maintains the illumination of lit pels until the erase of the next frame, providing infinite persistence unless an update of data in a later frame leaves the pel erased at the selective write time. In order to provide high-speed operation, it is necessary to maintain fast update times of the individual pels. The erase and write cycles should be short and, if possible, combined with sustain. When all pels on a line(s) are simultaneously erased, the entire panel consists of only half selected pels or zero selected pels on the non-selected line(s). At a time between sustain alternations, a triangular ramp signal rising from the mid-sustain value to the full-sustain value is held for the time of the selective write(s). This constitutes for the non-select line(s) a slow ramp up and a hold of an erase signal. For all other lines, there is only the half-selected case, only the sustain signal is present. The signals required to provide these conditions are a first polarity sustain signal followed immediately by the second polarity sustain signal. Beginning near the end of the first sustain signal,...