JPS5698088A - Invisible television - Google Patents

Abstract

PURPOSE:To secure an optional extraction of an image picked up the outside when wearing the deflecting glasses, by distributing the horizontal scanning lines plus the vertical and horizontal deflecting plates of the same number as the scanning lines in front of a screen and then displaying a normal image and the image obtained by giving a phase inversion to the three colors in overlap on the screen. CONSTITUTION:The screen 4 is provided to the outer box 3 of a picture receiver to which a normal TV camera is connected, and a number of vertical deflecting plate 5 are stuck in an odd-number line in front of the screen along with a number of horizontal plates 6 stuck in an even-number line. In this casem the number of the plates 5 and 6 are selected to the same number of the horizontal scanning lines. In addition, the color CRT10 connected to the electronic circuit container 12, the lens 9 attached to the fixed plate 8 and the reflector 7 are provided in the box 3. Then the circuit which applies the three primary colors as they are form the container 12 plus the circuit which applies the same three colors through the phase inverting circuit are provided to the CRT10. These colors are then compounded on the CRT10 and then formed into an overlapped image on the screen 4. Such image cannot usually been seen with the naked eyes. Then the image of the TV camera can be seen with the deflecting glasses.