BendixKing FPI 3501B System FPD 500 - Manual (Page 6)

1.1 SYSTEM DESCRIPTION
The indicator is designed for high reliability through the use of ASICs
and optimized mechanical packaging. The display is a flat panel
active matrix LCD with backlighting provided by a cold cathode fluo-
rescent lamp.
A Graphics Processor (GP) module produces flight instrument sym-
bology on the LCD display. The Interface Processor (IP) and I/O
modules consists of a 32 bit microprocessor, ARINC 429 interface
capability, and analog/discrete interface capability. These modules
process all of the control inputs from the indicator's front bezel/con-
trols, external ARINC 429 input data, external discrete data (includes
superflags), synchro and analog data, and provides the interface to
the GP module. The Low Voltage Power Supply (LVPS) provides the
necessary power to all of the system’s components, while the High
Voltage Power Supply (HVPS) provides power for the cold cathode
lamp. Dimming circuitry is provided to control the lamp's brightness.
The heaters (LCD and lamp) are activated when the unit is not at the
proper operational temperature due to cold ambient conditions.
1.2 INTERNAL MONITORING
The EADI and EHSI FPDs monitor the safety and integrity of the sys-
tem operation and isolate and annunciate failures as necessary.
Additional monitors provide fault isolation capability to isolate faults to
the SRU level. Loss of power to the indicator results in a completely
blank indicator. Failures that result in display of misleading informa-
tion also results in a completely blank indicator. Failure conditions
due to input data failures, indicator failure, or indicator interface fail-
ures result in annunciating the appropriate failure message on the
indicator. All ADI and HSI failure warning flags are annunciated as
black text in a red box. All caution flags are annunciated as black text
in a yellow box.
Each 5ATI flat panel display contains an Interface Processor (IP) and
a Graphics Processor (GP). The IP contains built-in-test functions
that monitor the display’s “health” on a continuous basis. Detected
failures result in either annunciation to the flight crew that a display
failure exists or flagging the appropriate display data. Detected fail-
ures are also logged in non-volatile memory for retrieval later.
Introduction
1-2 FPD 500 FLAT PANEL DISPLAY SYSTEM
Rev. 0
Jan/97
A