Table of Contents
Advertisement
Chapter 1: Product Overview 1-21
Operator Display
18427
The 7455 is available with either a 12.1" TFT (active matrix) or a 12.1"
DSTN (passive matrix) LCD.
DSTN LCD panels require a contrast adjustment for optimal viewing.
Contrast control is set by software, using a digital potentiometer on the
Processor Board. The terminal does not have a user-accessible contrast
adjustment. Software can set a default value after reading the Panel ID.
Display contrast changes with temperature. The DSTN panels contain
temperature-compensation circuitry that adjusts contrast automatically
as the temperature of the panel changes.
LCD Adapter Cable
The signals from the LCD header on the main board are brought up to
the LCD on a flex adapter cable. This cable plugs directly into the LCD
panel from the motherboard. The type of cable used is specific to the
type of LCD used. Each LCD has a specific panel I.D. which is
identified to the hardware system through the adapter cable.
Advertisement
Table of Contents
