Abstract

This report identifies and characterizes those segments of the population for whom the visibility of electroluminescent diodes is significantly abnormal. Red- and green-emitting GaP and red-emitting GaAsP diodes are considered explicitly. It is concluded that the most important classes of anomalous and dichromatic observers are the protanopes and protanomalous, for whom the brightness of red electroluminescent diodes is substantially reduced from that perceived by normal observers. Protanopes and protanomalous observers occur at the rate of about one in fifty in the male population. They possess approximately 14% of the normal photopic sensitivity when viewing red-emitting GaP diodes and about 10% when viewing red-emitting GaAsP diodes. No classes of anomalous or dichromatic observers have been found to experience significantly decreased visibility for green GaP diodes.

© 1972 Optical Society of America

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