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6.4 Liquid Crystal Display Backlights
Liquid crystal displays are manufactured with and without backlighting. Electrolumines-
cent (EL), cold-cathode fluorescent (CCFL), vacuum fluorescent (VFD), or LED back-
lighting are the types of backlighting available. The RabbitNet Keypad/Display interface
supports only LED backlighting because this is the most common type and is the most
likely to require external support.
Liquid crystal displays with LED backlighting derive their voltage or current via pins 15
and 16 of header J4 or J5. In those cases where a voltage source is used, the Keypad/
Display interface can be configured to supply 5 V to the liquid crystal display. Series resis-
tors on the liquid crystal display limit the current to the LED backlight and set its intensity.
To provide the 5 V voltage source, install 2-pin jumpers across pins 7–8 and 9–10 on
header J7.
When the LCD backlight specifications call for a current source, the series resistors on the
Keypad/Display interface are used to limit the current. The series resistance can be set
from 3.3 ? to 20 ? with the 2-pin jumpers on header J7. The liquid crystal display speci-
fications list the voltage required across its internal LEDs and indicate the allowable range
of current corresponding to the LED intensity. Subtract this LED voltage from 5 V, then
divide that by the current for the selected LED intensity to determine the required series
resistance. Install 2-pin jumpers on header J7 to configure the resistance value closest to
that calculated without exceeding the maximum current in the specification. Table 11
gives the resistance values and maximum current corresponding to various jumper settings.
Table 11. Header J7 Pins to Jumper to Configure LCD Series Resistance
Resistance
1–2
3–4
Header J7 Pins
5–6
7–8
9–10
Max. Current
(mA)
0.00 ?
3.33 ?
5.00 ? *
10.0 ?
13.3 ?
15.0 ?
20.0 ?
infinite
350
333
222
111
111
111
111
0
* Factory default.
NOTE: Make sure that the jumpers are set appropriately before connecting the liquid
crystal display to the Keypad/Display interface. The backlight on your liquid crystal
display may be destroyed when subjected to a current above the maximum specified.
Pay close attention when using the 0 ? resistance setting to source 5 V to the LCD.
User ’s Manual
125
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