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Browse Prior Art Database

Users Reminder to Switch Off PS/2 Monitors

IP.com Disclosure Number: IPCOM000122460D
Original Publication Date: 1991-Dec-01
Included in the Prior Art Database: 2005-Apr-04
Document File: 2 page(s) / 61K

Publishing Venue

IBM

Related People

Sawdon, D: AUTHOR

Abstract

This article describes a simple low-cost technique to highlight to a user that the PS/2* system unit has been switched off but that the monitor has not. The proposal is also applicable to monitors other than PS/2s, and to other system peripherals.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 58% of the total text.

Users Reminder to Switch Off PS/2 Monitors

      This article describes a simple low-cost technique to
highlight to a user that the PS/2* system unit has been switched off
but that the monitor has not.  The proposal is also applicable to
monitors other than PS/2s, and to other system peripherals.

      Some field failures are being attributed to users forgetting to
switch off their PS/2 monitors along with the system unit and that
monitors are therefore being powered for periods which are greater
than were used in the initial design and reliability calculations.
This disclosure provides a simple and low-cost mechanism for
increasing the "attention grabbing" capability of the power-on
indicator at such times without it leading to distraction during
normal operation.

      Monitors are provided with power-on indicators, but since they
are placed alongside the viewing area, they are necessarily designed
to be unobtrusive and not to detract from the normal usage of the
monitor.  The monitor power switch is either placed out of direct
view or is a push/push type which does not directly indicate its
position.  When the system unit is powered off, no artefacts appear
on the monitor screen and it looks as if the monitor is unpowered.

      Proposed is a simple system which causes the power-on indicator
to flash when both horizontal and vertical sync signals have been
absent for some period, for example the delay period may be up to one
second to provide filter...