HDSP-5621 datasheet(2/10 Pages) AVAGO

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Contrast Enhancement

The objective of contrast enhancement is to provide

good display readability in the end use ambient light.

The concept is to employ both luminance and chromi-

nance contrast techniques to enhance the readability.

This is accomplished by having the OFF dots blend into

the display background and the ON dots stand out vividly

against this same background. Therefore, these display

devices are assembled with a gray package and matching

encapsulating epoxy in the dots.

Contrast enhancement may be achieved by using one of

the following suggested filters:

Standard Red and AlGaAs Red (HDSP-5300/H150)

Panelgraphic RUBY RED 60

SGL-Homalite H100-1605 RED

3M Louvered Filter R6610 RED or N0210 GRAY

HER (HDSP-5500)

Panelgraphic SCARLET RED 60

SGL-Homalite H100-1670 RED or H100-1250 GRAY

3M Louvered Filter R6610 RED or N0210 GRAY

Yellow (HDSP-5700)

Panelgraphic YELLOW 27 or GRAY 10

SGL-Homalite H100-1720 AMBER or H100-1250 GRAY

3M Louvered Filter A5910 AMBER or N0210 GRAY

Green (HDSP-5600)

Panelgraphic GREEN 48

SGL-Homalite H100-1440 GREEN or H100-1250 GRAY

3M Louvered Filter YG6610 RED or N0210 GRAY

For further information on contrast enhancement please

see Application Note 1015.

Mechanical

Specially developed plastics are used to optimize the

displays optical performance. These plastics restrict the

solvents that may be used for cleaning. Only mixtures of

Freon (F113) and alcohol should be used for vapor clean-

ing processes. Total immersion time in the vapors is two

minutes. Some suggested mixtures are Freon TE, Arklone

A or K, or Genesolv DI-15 or DE-15. A 60°C (140°F) water

cleaning process may also be used. This process includes

a neutralizer rinse (3% ammonia solution or equivalent),

a surfactant rinse (1% detergent solution or equivalent),

a water rinse, and a thorough air dry. Room temperature

cleaning may be done with Freon T-E35 or T-P35, Ethanol,

Isopropanol, or water with a mild detergent.

Cleaning agents from the ketone family (acetone, methyl

ethyl ketone, etc.) and from the chlorinated hydrocarbon

family (methylene chloride, trichloroethylene, carbon tet-

rachloride, etc.) are not recommended for cleaning LED

parts. All of these various solvents attack or dissolve the

encapsulating epoxies used to form the package of plastic

LED parts.

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