Word: phosphors
(lookup in dictionary)
(lookup stats)
Dates: all
Sort By: most recent first
(reverse)
Sunlight TV Tube. Conventional TV pictures tend to fade out when the light in the room gets too bright. This is because the glowing substance (phosphor) on the face of the picture tube is a reflective powder. In sunlight or other strong light, the reflection gets brighter than the picture and washes the picture...
Last week the Naval Research Laboratory told about its new system of depositing the glowing phosphor as a transparent film by vacuum evaporation. The purpose of the project was to improve airplane instruments, but the transparent phosphor can be used for TV too. The picture will form as usual when the set is turned on, but light coming from the room will be reflected very weakly. Most of it will pass into the interior of the tube and be lost. So the picture will stay sharp and clear with full daylight shining on the tube...
...energy beta particles (electrons). Other atomic batteries have attempted to turn beta particles directly into electric current, but they have often run into trouble because the particles damage the current-yielding parts of the battery. The Kidde-Elgin battery sidesteps this difficulty by mixing the promethium 147 with a phosphor (light-giving substance) and enclosing the mixture in transparent plastic. Electrons from the Pm-147 make the phosphor glow, and its light is turned into electricity by a photoelectric surface of silicon on each side of the plastic wafer. No electrons escape from the plastic, and so the silicon...
...these plates carries the proper electrical charge, it deflects the electron beam downward. On their way down the electrons pass horizontal deflection plates and are turned sharply against the forward glass plate, which carries a picture-forming phosphor. When the voltage on both sets of deflection plates is changed simultaneously, the electron beam scans the phosphor, sweeping across it and producing a TV picture...
...even more radical flat tube under development by General Electric Co. gets rid of the vacuum, and it has no electron beam either. It consists of a sheet of "electroluminescent" phosphor that glows when it is excited by an electrical voltage. The phosphor is sandwiched between a matrix of horizontal and vertical wires. If there are 500 running in each direction there will be 250,000 points at which wires cross. These intersections can be made to glow by impressing the proper voltage on the wires. If the voltages are changed rapidly, the spot of light scans the screen, forming...