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Automatic Calibration Adjustment of Stylus Activated Personal Computers

IP.com Disclosure Number: IPCOM000113142D
Original Publication Date: 1994-Jul-01
Included in the Prior Art Database: 2005-Mar-27
Document File: 2 page(s) / 40K

Publishing Venue

IBM

Related People

Miller, RV: AUTHOR [+2]

Abstract

Described is a technique to provide automatic calibration and adjustment of touch sensitivity stylus operated screens, as used in Personal Computers (PCs). The technique implements an algorithm which allows for the retrieval of stylus calibration values and automatically activates the values for adjustment purposes on every power-on cycle.

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This is the abbreviated version, containing approximately 64% of the total text.

Automatic Calibration Adjustment of Stylus Activated Personal Computers

      Described is a technique to provide automatic calibration and
adjustment of touch sensitivity stylus operated screens, as used in
Personal Computers (PCs).  The technique implements an algorithm
which allows for the retrieval of stylus calibration values and
automatically activates the values for adjustment purposes on every
power-on cycle.

      In prior art, the calibration of stylus sensitivity was static
in nature requiring manual intervention to adjust threshold and
hysteresis values during every power-on cycle.  Manual adjustment was
required to enable the stylus to compensate for changes in the
calibration values.

      The concept described herein eliminates the need for the manual
adjustments by providing an automatic calibration adjustment of a
battery operated untethered stylus.  The calibration values, pen
threshold and hysteresis, are stored in static protected memory,
backed up by two separate power sources.  The calibration data is
automatically activated when the stylus device is loaded with the
operating system and device drivers.  As the stylus battery life
ages, or diminishes in output, the technique allows an application
program algorithm to automatically compensate for the change in
stylus sensitivity.  The following block diagram illustrates how the
algorithm is used in providing the automatic calibration adjustment:

      1.  Calibrate Stylus to des...