with screen acting as light valve by shutter operation, e.g. eidophor

Full Title

Cathode ray tubes; Electron beam tubes (H01J25/00, H01J33/00, H01J35/00, H01J37/00 take precedence; details of cathode ray tubes or of electron beam tubes H01J29/00) > having a screen on or from which an image or pattern is formed, picked up, converted, or stored > Image or pattern display tubes, i.e. having electrical input and optical output; Flying-spot tubes for scanning purposes > with screen acting as light valve by shutter operation, e.g. eidophor