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 higher than V

transients in the power supply line while they change display

states. The common practice is to place .01 mF capacitors close to

the displays across V

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 not exceed 93°C on the solder side of the PC board

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 temperature of 245°C ±5°C with a dwell between 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 faster cleaning, solvents may be used. Carefully select any sol-

vent as some may chemically attack the nylon package. Maximum

exposure should not exceed two minutes at elevated tempera-

tures. Acceptable solvents are TF (trichorotribluorethane), 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.

Unacceptable solvents contain alcohol, methanol, methylene chlo-

ride, ethanol, TP35, TCM, TMC, TMS+, TE, or TES. Since many com-

mercial mixtures exist, contact a solvent vendor for chemical

composition information. Some major solvent manufacturers are:

Allied Chemical Corporation, Specialty Chemical Division, Morris-

town, NJ; Baron-Blakeslee, Chicago, IL; Dow Chemical, Midland, MI;

E.I. DuPont de Nemours & Co., Wilmington, DE.

For further information refer to Appnotes 18 and 19 at

www.osram-os.com.

An alternative to soldering and cleaning the display 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 by longer SIP sockets or DIP sockets when available for uni-

form package alignment. Socket manufacturers are Aries Electronics,

Inc., Frenchtown, NJ; Garry Manufacturing, New Brunswich, NJ; Rob-

inson-Nugent, New Albany, IN; and Samtec Electronic Hardware,

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 (with almost no green) or fluorescent (with almost no

red) lights do not have the flat spectral response of sunlight. Plas-

tic band-pass filters are an inexpensive and effective way to

strengthen contrast ratios.

The DLR3416 is a standard red display 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 peaks 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-reflective coatings to reduce glare. The trade-off is

fuzzy characters. Mounting the filters close to the display reduces

this effect. Take care not to overheat the plastic filter by allowing 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 Products of California,

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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