Browse Prior Art Database

Touch Screen Isolation Technique

IP.com Disclosure Number: IPCOM000059840D
Original Publication Date: 1986-Jan-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Miles, AW: AUTHOR [+2]

Abstract

When a user employs a touch type data entry device, he presses his finger against the face of the touch screen which is positioned over the face of a cathode ray tube (CRT). The user's finger position is then sensed resulting in a signal being applied to the processor.

This text was extracted from a PDF file.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 1

Touch Screen Isolation Technique

When a user employs a touch type data entry device, he presses his finger against the face of the touch screen which is positioned over the face of a cathode ray tube (CRT). The user's finger position is then sensed resulting in a signal being applied to the processor.

One approach for sensing the user's finger position is to locate four equally spaced piezoelectric transducer elements around the inside face of the touch screen and between such face and the surface of the CRT.

Touch screens employing piezoelectric transducers, in some instances, may be sensitive to the vibrations of the table upon which the CRT display rests, or to accidental cover impacts, or other unwanted external forces, thereby creating accidental triggering and erroneous inputs. To minimize these erroneous inputs, an additional piezoelectric transducer is mounted to the machine cover which will be employed to monitor vibration levels. To supplement the use of the additional transducer, software and electronics would be provided to ignore any inputs when the additional transducer picks up an impact of a high vibration level. reject level could be set from the keyboard or other input device. However, a display device used in an office would be delivered with a preset vibration level.

Disclosed anonymously.

1