DLR3416, DLO3416, DLG3416
2006-01-23 11
Electrical and Mechanical Considerations
Voltage Transient Suppression
We recommend that the same power supply be used for the dis-
play and the components that interface with the display to avoid
logic inputs highe r than VCC. Additionally, the LEDs may cause
transients in the power supply lin e while they change display
states. Th e common pr actice is to place . 01 mF capa citors clos e to
the displays across VCC and GND, one for each display, and one
10 mF capacitor for every second display.
ESD Protection
The silicon gate CMOS IC of the DLX3416 is quite resistant to
ESD damage and capable of withstanding discharges greater than
2.0 kV. However, take all the standard precautions, normal for
CMOS components. These include properly grounding personnel,
tools, tables, and transport carriers that come in contact with
unshielded parts. If these conditions are not, or cannot be met,
keep the leads of the device shorted together or the parts in
anti-static packaging.
Soldering Considerations
The DLX3416 can be hand soldered with SN63 solder using a
grounded iron set to 260°C.
Wave soldering is also possible following these conditions: Pre-
heat that does n ot e xceed 93°C on t he solder side of t he PC boar d
or a package surface temperature of 85°C. Water soluble organic
acid flux (except carboxylic acid) or rosin-based RMA flux without
alcohol can be used.
Wave temperatur e of 245 °C ±5°C with a dwel l be tween 1. 5 sec. to
3.0 sec. Exposure to the wave should not exceed temperatures
above 260°C for five seconds at 0.063" below the seating plane.
The packages should not be immersed in the wave.
Post Solder Cleaning Procedures
The least offensive cleaning solution is hot D.I. water (60 °C) for
less than 15 minutes. Addition of mild saponifiers is acceptable.
Do not use commercial dishwasher detergents.
For f aster cleaning , solv ents ma y be used. Carefully select an y sol-
vent as some may chemic ally atta c k the n ylon pa c kag e . Maximum
exposure should not exceed two minutes at elevated tempera-
tures. Accep table solvents are TF (trich orot ribl uore thane ), TA, 111
Trichloroethane, and unheated acetone.
Note:
Acceptable commercial solvents are: Basic TF, Arklone, P.
Genesolv, D. Genesolv DA, Blaco-Tron TF and Blaco-Tron TA.
Unacceptab le solvents conta in alco hol, meth anol , methylene chlo-
ride, ethanol, TP35, TC M, TMC, TM S+, TE, or TES. Si nce many com-
mercial mixtures exist, cont act a so lvent v en dor for chemical
composition inf ormation. Some major solvent manufacturers are:
Allied Chemical Corporation, Specialty Chemical Division, Morris-
town, NJ; Baro n-Bl ak esl ee , Ch ic ago, IL; Dow Chemical , Midl and, MI ;
E.I. DuP ont de Nemours & Co., Wilmington, DE.
For further information ref er to Appnotes 18 and 19 at
www.osram-os.com.
An alternative to soldering and cleaning the displa y modules is to use
sockets. Standard pin DIP sockets .600" wide with 0.100" centers
work well for single displays . Multiple display assemblies are best
handled b y lon ger S IP socke ts or DIP soc k e ts wh en a vailable fo r uni-
form pac kage alignment. Soc ket man ufa cturers are Aries Electronics ,
Inc., F renchtown, NJ; Garry Manufacturing, New Brunswich, NJ; Rob-
inson-Nugent, Ne w Alb an y, IN; and Samtec Elect roni c Ha rdw are ,
New Albany, IN.
For further information refer to Appnote 22 at www .osram-os.com.
Optical Considerations
The 0.270" high characters of the DLX3416 gives readability up to
eight feet. Proper filter selection enhances readability over this dis-
tance.
Filters enhance the contrast ratio between a lit LED and the char-
acter background intensifying the discrimination of different char-
acters. The only limitation is cost. Take into consideration the
ambient lighting environment for the best cost/benefit ratio for fil-
ters.
Incandescent (wit h almost no g reen) or fluorescent (w ith almost no
red) lights do not have the flat spectral response of sunlight. Plas-
tic band-pass filter s are an in expensive and effective wa y to
strengthen contra st r at ios.
The DLR3416 is a stand ar d re d di splay and should be matched
with long wavelength pass filter in the 600 nm to 620 nm range.
The DLO3416 is a high efficiency red display and should be
matched with a long wavelength pass filter in the 470 nm to
590 nm range. The DLG3416 should be matched with a yel-
low-green band-pass filter that pea ks at 565 nm. For displays of
multiple colors, neutral density gray filters offer the best compro-
mise.
Additional contrast enhancement is gained by shading the dis-
plays. Plastic band-pass filters with built-in louvers offer the next
step up in contrast improvement. Plastic filters can be improved
further with anti-refle ctive coatings to re duce glare . The trad e-off is
fuzzy characters. Mounting the filters close to the display reduces
this effect. Take care not to ov erheat the plastic filter by allo wing for
proper air flow.
Optimal filter enhancements are gained by using circular polar-
ized, anti-reflective, band-pass filters. Circular polarizing further
enhances contrast by reducing the light that travels through the fil-
ter and reflects back off the display to less than 1%.
Several filter manufacturers supply quality filter materials. Some of
them are: Panelgraphic Corporation, W. Caldwell, NJ; SGL Homa-
lite, Wilmington, DE; 3M Company, Visual Products Division, St.
Paul, MN; Polaroid Corporation, Polarizer Division, Cambridge,
MA; Marks Polarized Corporation, Deer Park, NY, Hoya Optics,
Inc., Fremont, CA.
One last note on mounting filters: recessing displays and bezel
assemblies is an inexpensive way to provide a shading effect in
overhead lighting situations. Several Bezel manufacturers are:
R.M.F. Products, Batavia, IL; Nobex Components, Griffith Plastic
Corp., Burlingame, CA; Photo Chemical Prod ucts of Califor nia,
Santa Monica, CA; .E.E.-Atlas, Van Nuys, CA.
Refer to Appnote 23 at www.osram-os.com.
Published by
OSRAM Opto Semiconductors GmbH
Wernerwerkstrasse 2, D-93049 Regensburg
www.osram-os.com
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