Browse Prior Art Database

Dual Spatial Resolution Monitor

IP.com Disclosure Number: IPCOM000116857D
Original Publication Date: 1995-Nov-01
Included in the Prior Art Database: 2005-Mar-31
Document File: 2 page(s) / 34K

Publishing Venue

IBM

Related People

Leise, LE: AUTHOR

Abstract

Disclosed is a technique for displaying small resolution images on low and medium resolution monochrome and color monitors.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 93% of the total text.

Dual Spatial Resolution Monitor

      Disclosed is a technique for displaying small resolution images
on low and medium resolution monochrome and color monitors.

      This technique redefines the raster image size displayed on the
Cathode Ray Tube (CRT) thus increasing the spatial resolution.  This
allows displaying a smaller, but more dense image on less expensive
displays/monitors.  Pictures could, therefore, be displayed on
monochrome
monitors that previously could only display text and low/medium
resolution graphic information.

      The reduction in the raster size would be accomplished in one
of several manners: reduce the drive signal to the horizontal and
vertical output drivers; put switchable shunt circuits in both the
horizontal and vertical yoke circuits; use only a portion (e.g., one
of many parallel horizontal windings) of the yoke windings in series
with external circuitry.  All of these methods have the effect of
reducing the yoke drive currents, reducing the displayed raster size
and increasing the effective spatial resolution.

      The basic objectives would be to use the same deflection yoke,
have the same impedance seen by the deflection circuitry, and keep
the same scan frequency.  This would minimize the cost impact to
allow
displaying small high resolution images.

      A secondary consideration would be that the smaller raster
would concentrate the electron beam creating an abnormally bright
image.  Therefore, when in r...