Ferroelectric ceramic storage display tube

Claim 2

In a cathode ray-type storage display tube arrangement, the improvement comprising: a layer of ferroelectric ceramic means mounted within said tube adjacent the inner surface of the display faceplate thereof in a strain-biased condition so as to be birefringent; a layer of reflective material means mounted adjacent said layer of ferroelectric ceramic means; a layer of photoconductive material means mounted adjacent said layer of reflective material means; means to apply a voltage across the combination of said layer of ferroelectric ceramic means and said layer of photoconductive material means to establish an electric field in the thickness direction of said layer of ferroelectric ceramic means which field may be locally modulated by said layer of photoconductive material means in accordance with an image to be stored therein so as to thereby create local polarization charge flow through said layer of ferroelectric ceramic means to modulate the said birefringence therein in accordance with said image; a layer of cathodoluminescent phosphor means mounted adjacent said layer of photoconductive material means so that when said phosphor means is locally excited by the electron beam of said tube in accordance with the said image to be stored therein, corresponding regions of local conductivity are created in said layer of photoconductive material means in accordance with said image so as to thereby modulate the said birefringence in said layer of ferroelectric ceramic means to create a stored birefringence pattern therein corresponding to said image; and means to reflect plane-polarized light through the said birefringence pattern of said layer of ferroelectric ceramic means from said layer of reflective material means to thereby obtain a polarization pattern corresponding to the said image stored in said layer of ferroelectric ceramic means.

Claim 3

The display tube arrangement as set forth in claim 1 wherein said means to apply a voltage across the said combination of said layer of ferroelectric ceramic means and said layer of photoconductive material means includes a pair of transparent conductive layers respectively mounted adjacent thereto on each side thereof.

Claim 4

The display tube arrangement as set forth in claim 2 wherein said projection means includes a projection screen for projecting thereon the light reflected through said birefringence pattern.

Claim 5

The display tube arrangement as set forth in claim 3 wherein said layer of ferroelectric ceramic means comprises lead zirconate-lead titanate ferroelectric ceramic material.

Claim 6

In a cathode ray-type storage display tube arrangement, the improvement comprising: a layer of rhombohedral-phase lead-lanthanum-zirconate-titinate ferroelectric ceramic material means mounted within said tube adjacent the inner surface of the display faceplate thereof and responsive to have selectively produced therein local scattering sites for selectively diffusing light in accordance with a selected pattern; a layer of reflective material means mounted adjacent said layer of ferroelectric ceramic material means; a layer of photoconductive material means mounted adjacent said layer of reflective material means; means to apply a voltage across the combination of said layer of ferroelectric ceramic material means and said layer of photoconductive material means to establish an electric field in the thickness direction of said layer of ferroelectric ceramic material means which field may be locally modulated by said layer of photoconductive material means in accordance with an image to be stored therein so as to thereby create local polarization in said layer of ferroelectric ceramic material means to form a pattern of said scattering sites corresponding to said image to be stored; a layer of cathodoluminescent phosphor means mounted adjacent said layer of photoconductive material means so that when said phosphor means is locally excited by the electron beam of said tube in accordance with the said image to be stored therein, corresponding regions of local conductivity are created in said layer of photoconductive material means in accordance with said image so as to thereby effect local polarization in said layer of ferroelectric ceramic material means to create a stored pattern of scattering sites therein corresponding to said image to be stored; and means to reflect collimated light through said layer of ferroelectric ceramic material means so that light reflected through said pattern of scattering sites is diffused to form said image.

Claim 7

In a cathode ray-type storage display tube arrangement, the improvement comprising: a layer of rhombohedral-phase lead-lanthanum-zirconate-titinate ferroelectric ceramic material means mounted within said tube adjacent the inner surface of the display faceplate thereof and responsive to have selectively produced therein local scattering sites for selectively diffusing light in accordance with a selected pattern; a layer of reflective material means mounted adjacent said layer of ferroelectric ceramic material means; a layer of photoconductive material means mounted adjacent said layer of reflective material means; means to apply a voltage across the combination of said layer of ferroelectric ceramic material means and said layer of photoconductive material means to establish an electric field in the thickness direction of said layer of ferroelectric ceramic material means which field may be locally modulated by said layer of photoconductive material means in accordance with an image to be stored therein so as to thereby create local polarization in said layer of ferroelectric ceramic material means to form a pattern of said scattering sites corresponding to said image to be stored; a layer of cathodoluminescent phosphor means mounted adjacent said layer of photoconductive material means so that when said phosphor means is locally excited by the electron beam of said tube in accordance with the said image to be stored therein, corresponding regions of local conductivity are created in said layer of photoconductive material means in accordance with said image so as to thereby effect local polarization in said layer of ferroelectric ceramic material means to create a stored pattern of scattering sites therein corresponding to said image to be stored; and means to reflect collimated light through said layer of ferroelectric ceramic material means so that light reflected through said pattern of scattering sites is diffused to form said image.

Claim 8

The display tube arrangement as set forth in claim 5 wherein said means to apply a voltage across the said combination of said layer of ferroelectric ceramic material means and said layer of photoconductive material means includes a pair of transparent conductive layers respectively mounted adjacent thereto on each side thereof.

Claim 9

The display tube arrangement as set forth in claim 6 wherein said rhombohedral-phase lead-lanthanum-zirconate-titinate ferroelectric ceramic material has a grain size of approximately 4 to 5 microns.