Abstract: A probe card and its corresponding illumination device are provided for performing electrical operating tests, preferably done in parallel, with respect to a plurality of chips provided with connection pads, under illumination conditions given by a lighting source, the probe card being a printed circuit board (PCB) including electrical connections to the chip on its lower face, the probe card also including electrical connections to the lighting.

Abstract: A probe card and its corresponding illumination device are provided for performing electrical operating tests, preferably done in parallel, with respect to a plurality of chips provided with connection pads, under illumination conditions given by a lighting source, the probe card being a printed circuit board (PCB) including electrical connections to the chip on its lower face, the probe card also including electrical connections to the lighting.

Abstract: A method for regenerating a cathodoluminescent screen provided with at least one anode adapted to being excited by electron bombarding in a line scanning, consisting of providing regeneration phases during which the anode is at a quiescent potential, a portion only of the lines being addressable in a line scanning upon each regeneration phase, and cathodes being biased in a state corresponding to that of a preceding image.

Abstract: The present invention relates to a flat display screen including a light-emitting source organized in a first array of strips generally parallel in a first direction, and at least one second opaque array, interposed between the light-emitting source and a display surface, and organized in a second direction generally non-perpendicular to the first direction, at least one of the arrays exhibiting, along an axis parallel to the general direction of the first array and whatever the position of this axis in a perpendicular direction, a constant proportion of transparent surface for an elementary pattern.

Abstract: The present invention relates to a flat display screen cathode of the type including, on a substrate, columns of cathode conductors which can be biased individually and associated with a resistive layer on which are deposited electron emission microtips, and including means for canceling a possible lateral electric field between two neighboring columns brought to different potentials.

Abstract: The present invention relates to a flat color display screen including a cathode associated with an electron extraction grid, an anode provided with at least two types of phosphor elements, all polarized to a same potential, and at least two additional superposed grids, positioned on the extraction grid, and each provided with holes defining sub-pixels associated with each of the colors. Each additional grid is associated with a color and some of the holes thereof are of smaller diameter than the coaxially corresponding holes of the other additional grids, for activating the sub-pixels of the corresponding color.

Abstract: The present invention relates to a flat display screen anode of the type including at least two sets of parallel alternate strips of anode conductors coated with phosphor elements and separated from one another by insulating strips, and focusing conductive strips, aligned and substantially centered with the insulating strips, the focusing conductive strips having lower widths than the insulating strips.

Abstract: The present invention relates to a flat display screen including a cathode associated with a grid for extracting electrons emitted by at least one region of the cathode, and an anode provided with phosphor elements placed facing the cathode/grid, the cathode having no emissive region in the areas located above the phosphor elements, these areas including a conductive layer which can be biased independently from the emissive regions.