A Radio Frequency circuit includes an active portion and a tuned portion. A video data memory sequentially stores the video data. Alignment of optical conductors or cores of fiber-optic cables is provided by coupling a magnetic member to one core end and applying a controllable magnetic field from outside of the terminus to move the core into alignment position, and then fixing the core in place by the use of means such as light-curable epoxy resin. It may be used with photography, videography, or optical imaging of live scenes. The point light source has an emitting-angle of about 180 degrees and luminance difference between a bright-portion and a dark-portion is decreased to enhance display quality of a display device.