An apparatus and method for concealing and revealing a light emitting display. The reflection type projection optical system comprises, successively from the enlargement side, a first mirror having a positive power, a second mirror having a negative power, and a third mirror having a positive power. Preferably contamination is avoided by mounting the cleaner on a pedestal. However, the identified email address remains part of the recipient field. Then, the screws are tightened to hold the module in place against the heat sink.