Table of Contents
Advertisement
7.1
Optical Characteristics (Continued)
Definition of optical response.
7.2
Viewing Angle Adjustment
The factory preadjusts the viewing angle of the display by setting the LCD bias voltage to 10.2 Volts using the
on–board potentiometer. This is considered to be a nominal adjustment, but the user may prefer to vary this to
optimize the viewing for a particular application. The bias voltage is measured between V
(pin #6).
The viewing angle and contrast ratio may be externally controlled using an additional 10K ohm potentiometer.
The potentiometer on the rear of the module must first be set to the maximum resistance by turning the
adjustment fully counterclockwise. A 10K ohm potentiometer can then be connected between pin numbers 4
and 7 on the connector. Since the module has wide viewing angle characteristics and built–in temperature
compensation of the viewing angle, the user may find that this external viewing control is unnecessary.
8.0
FIBER OPTIC BACKLIGHT
8.1
FO Backlight Description
The module contains a light emitting flat panel constructed of plastic optical fibers which convey the light from a
separately located light source. The panel is heat free, has indefinitely long life and has good brightness
uniformity. The optical fibers are gathered into a bundle at the end of the flat panel and are routed to the light
source.
The separately located light source is affixed to a bracket that mounts behind the display module using two of
the module mounting holes (see the outline drawing, Figure 18). If the increased module depth is not
acceptable, light source can be relocated elsewhere by the user within an approximate 2.5 inch radius (length
of the fiber bundle) from the end of the display module. The standard light source is a halogen 5.0 Volt, 4.85
Watt lamp with 8.0 inch leads terminated by a connector to be connected by the user.
Care should be exercised in the physical location of the light source since halogen lamps operate in excess of
250 C.
Because the attenuation of the LCD cell, only 10% of the backlight luminance is emitted from the display. Thus
to provide a brightly lit display, the original light source must be 10 times brighter.
Industrial Electronic Engineers, Inc.
Van Nuys, California
10% ON
90% ON
t
d
Excitation
Figure 16
Definition of Optical Response
t
r
SIZE
CODE IDENT NO.
A
05464
SCALE
N/A
REV
t t
f
t
d
(pin #7) and V
CC
S03875–06–0214
A
SHEET 23
BIAS
Advertisement
Table of Contents
