A Grid-Controlled Color Kinescope

A new color kinescope makes use of a series of closely spaced screens, each covered with a different primary color phosphor and separated from each other by fine mesh control grids. Small voltage changes of these grids control the depth of penetration of the scanning beam or beams into this assembly of screens. This arrangement permits individual excitation of any one or combination of the primary colors which go to make up the colored image. Experimental tubes have been built, first in two-color form to test principles, and then in three-color form. They have been operated with a color picture using the RCA color television system signal.