Computers; Optical lenses; Transparency projection apparatus; Projectors particularly projectors for the entertainment industry; Optical modules used in projectors to generate and convert light beams into images through assembly of optical elements; Photoelectric sensors; Photoelectric detectors; Electronic circuits; Integrated circuits; Circuit boards; Touch pads; Light-emitting devices using light-emitting diodes or laser diodes for projectors; Projector lamps; Video projectors; Multimedia ...