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Browse Prior Art Database

Touch Control Digital Monitor

IP.com Disclosure Number: IPCOM000104963D
Original Publication Date: 1993-Jun-01
Included in the Prior Art Database: 2005-Mar-19
Document File: 4 page(s) / 190K

Publishing Venue

IBM

Related People

Cromar, C: AUTHOR [+4]

Abstract

Disclosed is an enhancement to a solid-state opto-electric operating control device responsive to finger stimulus described in UK Patent Application 90311404.9 (1990). Known as Touch Control and used in conjunction with an Inter IC bus, the patent device, and modified circuitry is combined with controlling software, to facilitate integration into existing digitally adjustable window colour displays. Advantages over digipot monitors is improved reliability by elimination of moving parts also, users only need to touch an LED to activate the set-up process thus avoiding exiting from the host session.

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Touch Control Digital Monitor

      Disclosed is an enhancement to a solid-state opto-electric
operating control device responsive to finger stimulus described in
UK Patent Application 90311404.9 (1990).  Known as Touch Control and
used in conjunction with an Inter IC bus, the patent device, and
modified circuitry is combined with controlling software, to
facilitate integration into existing digitally adjustable window
colour displays.  Advantages over digipot monitors is improved
reliability by elimination of moving parts also, users only need to
touch an LED to activate the set-up process thus avoiding exiting
from the host session.

Existing Arrangement

      IBM Info Window colour displays do not use potentiometers for
adjusting the front of screen parameters.  Instead, a versatile chip
set utilizing an interfacing method termed Inter-Integrated Circuit
Bus (IIC Bus) is used which is structured for economy and efficiency.
Since data throughput for control functions is low, it transfers the
data serially in either direction at up to 100 kbits/sec.  It
requires only two wires: one for data and one for the system clock, a
few IC pins with simple PCB wiring and interboard connectors.  It
does not limit the scale of integration per IC package, reducing cost
and PCB area.  As the IIC Bus is a multi-master bus, so control can
be assumed by more than one of the ICs connected.  To avoid loss or
corruption of information, a unique address is allocated to each IC
and the bus protocol incorporates an arbitration procedure to decide
control priorities.  When ICs with fast clocks communicate with ICs
with slow clocks, the protocol effectively synchronizes the system
clock by defining the clock source.

      The IIC bus supports a wide range of micro-controllers and
peripheral ICs fabricated in many different technologies and has
become accepted as an industry standard.

      An IBM display contains a mask-programmable microprocessor, an
EEPROM memory and a number of DAC modules which communicate over a
two-wire bus structure that conforms to the IIC Bus System Spec.  The
microprocessor is programmed by the supplier with default values that
are sent to the individual DACs upon initial power on.  The
microprocessor periodically updates the DACs to ensure the integrity
of their data when the appropriate register is set correctly.  At the
end of the box set-up, the Front of Screen (FOS) DAC settings are
written into the memory including the DAC settings determined by the
set-up process as well as other memory locations.  Adjustment of the
DACs is from the keyboard.  The machine must be offline and in set-up
mode before adjustment is possible, which may be frustrating for the
user.

      Located in the bezel of all IBM monitors is a power-on
indicator.  The device used in the Touch Control houses the power-on
indicator and an infrared (IR) emitter and detector, contained within
a translucent light guide.  The emitter i...