Browse Prior Art Database

Control of Power Mamagement for CRT Based Displays

IP.com Disclosure Number: IPCOM000111106D
Original Publication Date: 1994-Feb-01
Included in the Prior Art Database: 2005-Mar-26
Document File: 4 page(s) / 99K

Publishing Venue

IBM

Related People

Grant, G: AUTHOR [+5]

Abstract

Disclosed is a method to offer power management of CRT displays by control of the interface synchronisation and self test signals. Power management may be invoked by either IBM or OEM adapters and systems that have control over the synch lines. Power control instructions can be communicated to the monitor using existing video adapters with modified software drivers.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 52% of the total text.

Control of Power Mamagement for CRT Based Displays

      Disclosed is a method to offer power management of CRT displays
by control of the interface synchronisation and self test signals.
Power management may be invoked by either IBM or OEM adapters and
systems that have control over the synch lines.  Power control
instructions can be communicated to the monitor using existing video
adapters with modified software drivers.

      The objective is to implement power management in response to
customer requirements which can also prolong the life of the display
unit.  The 'preferred' method of control is by the IIC interface bus
between the display and system unit/adaptor card.

      The Vertical (V) and Horizontal (H) sync lines are used to
signal to the display the level of power saving required.  The table
below shows the various states available.  The state of the display
will be indicated to the user by means of a multicoloured LED in the
display replacing the current GREEN only LED.  This is a requirement
since the screen will be blanked when the power management circuitry
is operating.

      The Figure shows the various levels of compatibility that will
be used to allow upward compatibility when subsequent adaptors become
available.  In the display there will be a microprocessor or similar
device which is capable of utilising the IIC bus for control of
various aspects of the display in addition to the power management
functions.  Since the power management is performed either by IIC
control from the display adaptor OR by control of the sync lines, it
will be possible for OEM adaptors with the appropriate device driver
to take advantage of the power management functions by control of the
sync lines.

For each display mode:

Normal:        The display is powered on and functioning as per a
               'normal' display.

No Video:      In this case, the drive to the CRT is disabled and the
               video amp is inactive.  Note that the back raster of
the
        ...