Abstract: A flat gas discharge display includes a gas-filled envelope having mutually parallel front and rear wall plates disposed one behind the other as seen in a given viewing direction, at least one relatively large area cathode disposed on the front side of the rear wall plate, a cathodoluminescent layer and an anode disposed on the rear side of the front wall plate, a control unit disposed between the wall plates including front, central and rear grid electrodes each formed of a group of mutually parallel strip conductors, the strip conductors of the central grid electrode being column conductors, the strip conductors of the rear grid electrode being row conductors forming an orthogonal matrix together with the column conductors, and the strip conductors of the front grid electrode being tetrode conductors extended parallel to the row conductors and crossing the column conductors at given locations, the control unit being perforated with canals at the given locations where the tetrode conductors and column conduc

Abstract: Gas discharge display device having a gas-filled space gas-tightly closed on one side by a front plate and on a side opposite thereto by a back plate and subdivided by a control plate into a gas discharge space and a post-acceleration space, the control plate carrying electrode runs respectively addressable separately and forming a matrix as row conductors on one side of the control plate and as column conductors on the other side of the control plate, and having, together with the electrode runs, control through holes at intersection points of the matrix, a fluorescent screen disposed on the side of the front plate opposite the control plate and defining the post-acceleration space, the fluorescent screen having an anode layer thereon, and at least one insulated cathode on the side of the back plate and defining the gas discharge space, the control plate having, on the side thereof facing towards the post-acceleration space, a plate having a raster of holes formed therein coincident with a raster of the cont

Abstract: A gas discharge display device having a gas-filled space defined on one side by a front plate and on a side opposite thereto by a back plate and subdivided by a control plate into a gas discharge space and a post-acceleration space, the control plate carrying electrode runs including column conductors and anode row conductors forming a matrix having cross-points defining image points, a fluorescent screen disposed on the side of the front plate facing the control plate and defining the post-acceleration space, the fluorescent screen having an anode layer thereon, and at least one insulated cathode on the side of the back plate facing the control plate and defining the gas discharge space, and an auxiliary control plate having anode conductor strips on at least one side thereof that are parallel with the anode row conductors, the device including groupings of anode row conductors, each group thereof having M sequentially numbered conductors; groupings of anode conductor strips, each group thereof having N sequ

Abstract: Flat picture reproduction device for displaying color pictures based upon three basic colors, containing a vacuum-tight envelope with an electrode matrix formed of row conductors and column conductors arranged in front of the row conductors. It has cutouts at the intersections of the row and column conductors and divides the interior of the envelope into a rear and a front chamber. A planar electron source is located in the rear chamber, elongated deflection electrodes located in the front chamber, between adjacent column conductors. The odd-numbered deflection electrodes are connected to a first voltage source, and the even-numbered ones to a second voltage source. Strip-shaped layers of luminescent phosphor is applied to the front side of the envelope wall adjacent one another in a periodic color sequence parallel to the column conductors.

Abstract: A liquid crystal display incorporates a pair of spaced carrier plates separating a layer of liquid crystal material, both of the plates having a set of selection conductors on their inside surfaces, defining a display matrix of visual elements, and a plurality of boundary electrodes connected with one or both sets of selection conductors surrounding each individual visual element.

Abstract: Optical, fluorine containing barium borosilicate glasses having an improved varying partial dispersion in the optical positional range of lanthanum crown and lanthanum flint glasses wherein the ratio of SiO.sub.2 with respect to SiO.sub.2 and B.sub.2 O.sub.3 is at least 0.62 and the content of fluorine in said glass is between 2 and 7 grams per 100 cc of said glass.