Abstract: A projection-type display apparatus, being suitable to be applied as a light source of a solid-state light source, in the place of a conventional lamp, comprises: a light source unit, which is configured to emit a white-color light therefrom; a light separation optic system, which is configured to separate the white color light from the light source unit into three primary color lights, red-color (R), green-color (G) and blue-color (B); R, G and B light modulating portions, each of which modulates each of R, G and B polarized lights separated, depending on a video signal, respectively; a light composing unit, which is configured to compose optical images, which are formed by the R, G and B light modulating portions; and a projecting portion, which is configure to project the optical image composed, enlargedly, wherein the light source unit emits a white color light emitting from a nearly point-like light source, including an excitation light from a solid-state light emitting element therein.

Abstract: A display device for information signals which performs highly efficient image display of a standard television signal, a high definition television signal, a progressive scanning television signal or a stereoscopic television signal on the same screen has a first signal input unit applied with the standard television signal, a second signal input unit applied with the high definition television signal, progressive scanning television signal or stereoscopic television signal, a mode designation unit for designating a mode for display of one of the signals, a signal conversion unit including a write unit for writing the first signal, at a frequency thereof, to memories and a read unit for reading the memories at a frequency which is nearly twice that of the first signal, a signal switching unit, a signal processing unit and a deflection switching unit, whereby a first display signal from the signal conversion unit or a second display signal from the second input terminal is selected and image-displayed on the

Abstract: A channel selection apparatus of a television receiver having a sequential shift signal input terminal for receiving a sequential shift signal to sequentially shift a selected channel position and an electronic tuning type channel selection IC having a defeat signal output terminal for producing a pulse output when the selected channel position changes and a plurality of channel selection output terminals for producing outputs indicative of the channels to be selected.

Abstract: In a television receiver having a peak value type AGC circuit for maintaining the amplitude difference between a carrier zero level and the peak value of a composite video signal amplified by a high frequency amplifier and a video intermediate frequency amplifier at a constant magnitude, an automatic brightness limiter (ABL) circuit is provided which controls the AGC circuit such that when the beam current exceeds a predetermined value and the carrier zero level approaches the peak value, a composite video signal of reduced amplitude is produced.

Abstract: A noise reducing circuit for video signals, in which a transistor has its base connected to a video detector and its collector to a direct current source through a coil, two diodes have their cathodes connected together and grounded through a first resistor with the anode of one of the diodes connected to one end of the coil and that of the other diode connected to the other end thereof, the collector of the transistor is further connected through a capacitor and a second resistor to the input terminal of a video output amplifier, which input terminal is grounded through a third resistor, and the emitter of the transistor is connected through another coil to the said terminal and grounded through another capacitor and a variable resistor.