公开(公告)号：DE2753492A1

公开(公告)日：1978-07-06

申请号：DE2753492

申请日：1977-12-01

Applicant: IBM

Inventor： SCHLIG EUGENE STEWART ,  STILWELL JUN GEORGE RAYMOND

IPC: G09G3/28 ,  G09G3/288 ,  G09F9/30 ,  H01J61/92

公开(公告)号：DE2734202A1

公开(公告)日：1978-02-23

申请号：DE2734202

申请日：1977-07-29

Applicant: IBM

Inventor： SCHLIG EUGENE STEWART ,  STILWELL JUN GEORGE RAYMOND

IPC: H04N5/66 ,  G06F3/033 ,  G06F3/038 ,  G06F3/041 ,  G06F3/048 ,  G09G3/20 ,  G09G3/28 ,  G09F9/30 ,  H01J61/92

Abstract: LIGHT PEN DETECTION AND TRACKING WITH AC PLASMA DISPLAY PANEL A light pen detection and tracking scheme for detecting and tracking both "on" and "off" cells with a single cursor voltage waveform in an AC gas discharge display panel. The special cursor voltage waveform is applied to the panel during the sustain cycle, in either a line-by-line or binary scanning fashion, to momentarily fire both "on" and "off" cells so that they may be detected by the light pen without a loss of the memory state of the cells. A cross-hair cursor is automatically displayed at the pen position when the search scan is complete. Since both "on" and "off" cells are detected, the system can respond to pen motion by repeating the search to reacquire the pen, so that no special tracking strategy is needed.

公开(公告)号：DE2734543A1

公开(公告)日：1978-02-16

申请号：DE2734543

申请日：1977-07-30

Applicant: IBM

Inventor： SCHLIG EUGENE STEWART ,  STILWELL JUN GEORGE RAYMOND

IPC: G06F3/023 ,  G06F3/048 ,  G09G3/20 ,  G09G3/28 ,  G09G3/288 ,  G09G5/08 ,  G11C11/28 ,  G09F9/30 ,  H01J61/92

Abstract: A nondestructive, transparent cursor for AC plasma displays may be superimposed electronically over a displayed image without regenerating the original image each time the cursor is moved. The cursor is displayed by means of a special cursor drive waveform which discharges both previously "on" and "off" cells which form the cursor but permits reversion of the cells to their original state when the cursor drive waveform is removed and the normal sustaining waveform is restored.