Color Tele Goes Big (Jul, 1947)
Color Tele Goes Big
COLOR television that can be projected on a large screen is the latest achievement of RCA engineers. At a demonstration in a large auditorium, color images were received and shown on a 7-1/2- by 10-foot screen. The new receiver-projector utilizes the all-electronic system of color transmission (PSM, Feb. ’47, p. 100) in which three separate images in red, green and blue are sent out simultaneously over adjoining channels.
At the receiver, each image is picked up by a separate kinescope and focused onto a concentric mirror that reflects the picture back to the screen. Correcting lenses compensate for mirror distortion, so the three pictures reach the screen in proper focus and proper register.
Although color and picture quality are good, images do not have the brightness and definition achieved by black-and-white receivers. RCA experts say several years will be needed to bring color television up to present monochrome standards.
Because of the cost of three-part receivers and the delicate optical system necessary when using large-screen equipment, the new system is better suited to industrial plants and theaters than the home.