INVENTED : 1987 

PATENTS: 

- Procédé et dispositif pour projeter et observer des images differenciees ou stereoscopiques, dessins, photographies, films cinematographiques ou video, INPI-FR, N⁰ 8907241 1989/1993

- Patent pending: "Processo para projeção de imagens com paralaxe horizontal sobre tela holográfica, INPI-BR, N⁰ 9302553-0, 1993.18.07 

FUNDAMENTAL SCHEME OF OPERATION

The diffractive screen can be compared to a diffractive lens or to the hologram of a point source. But receives focused white light. Po and P1 are points on a projecting lens, and may coincide. An image in pure red, for example, can be seen by the right eye R.E. while an entirely different image in pure green can be seen by the left eye L.E.. Following this example we can see below how the presence of a point in three dimensional space can be established by having one representative element for each wavelength. One green and one red point can be imaged at a certain horizontal distance on the screen giving a virtual image behind the screen, or can coincide at the same position for giving the image on the screen, or in reversed sequence at a certain distance to converge light in front of the screen. For a continuous spectrum, horizontal parallax is present, as in a Benton hologram but with colors changing horizontally.