Patent ID: 6386708
Filing Date: 2002-05-14
Classification: H04N,H05K

Abstract:
A projection display device comprising:a light source; an optical system that optically processes light emitted from the light source to form an optical image corresponding to image information; a projection lens that projects the optical image formed by the optical system on a projection plane; a device case containing at least the light source and the optical system; a control circuit substrate contained in a predetermined space in the device case, the control circuit substrate having a mounted thereon a control circuit that controls driving of a device thereon; an external apparatus connecting terminal provided on the control circuit substrate through which the control circuit is operated by an input operation signal from an external apparatus; and a signal transmission circuit having a light emitting element and a light receiving element and provided in an external input signal transmission passage between the terminal and the control circuit, the control circuit substrate comprising a first circuit substrate on which the control circuit and the light receiving element are provided, and a second circuit substrate arranged opposite to the first circuit substrate, the second circuit substrate having mounted thereon the external apparatus connecting terminal and the light emitting element.