Projection display has controller that varies discharge lamp energy on basis of energy detected on basis of predefined information, e.g. on time, lamp current, lamp voltage, lamp temperature

摘要

The arrangement has a discharge lamp (23) and a detector that detects the lamp energy on the basis of predefined information and a controller that controls the lamp on the basis of the detector result to vary the lamp energy. The information is selected from the on time, a lamp current, a lamp voltage, a lamp temperature, a lamp emission spectrum, a lamp color temperature and a lamp emission color measure.