Browse Prior Art Database

Monitor Stand-By Mode Control

IP.com Disclosure Number: IPCOM000114210D
Original Publication Date: 1994-Nov-01
Included in the Prior Art Database: 2005-Mar-28
Document File: 2 page(s) / 50K

Publishing Venue

IBM

Related People

Naitoh, M: AUTHOR [+2]

Abstract

This article describes an signal interface between a CRT display and a computer system unit which has stand-by function to save power consumption or to elongate the CRT life. The stand-by mode control signal from the system unit is formed by combination of on/off status of horizontal and vertical sync signals.

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This is the abbreviated version, containing approximately 81% of the total text.

Monitor Stand-By Mode Control

      This article describes an signal interface between a CRT
display and a computer system unit which has stand-by function to
save power consumption or to elongate the CRT life.  The stand-by
mode control signal from the system unit is formed by combination of
on/off status of horizontal and vertical sync signals.

      The Figure shows the block diagram of this device.  The CRT
control circuit (2) stops output of horizontal and/or vertical sync
signals in response to receiving the stand-by signal from stand-by
control circuit in the system unit (1).  At that time, the video
signal output is also shut down.  The sensor circuit in the CRT
display (3) is monitoring the output on/off status of horizontal and
vertical sync signals.  If the signal output is shut down, it send a
stand-by signal to the stand-by control circuit in the CRT display
(4).  Three kinds of sync signal output on/off status exist;
horizontal sync off, vertical sync off, and both sync off.  And two
kinds of off status exist; signal hold High level, and hold Low
level.  Therefore, total eight combinations of on/off status can be
implemented to control the CRT display into eight kinds of stand-by
mode.  Based on this stand-by mode, the stand-by control circuit in
the CRT display (4) send control signals to the video circuit (5),
the horizontal deflection circuit (6), the vertical deflection
circuit (7), the power circuit (8), and the CRT heater circuit (9) to...