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Light Pen for Long Persistence Phosphor Disclosure Number: IPCOM000060695D
Original Publication Date: 1986-Apr-01
Included in the Prior Art Database: 2005-Mar-09

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Barbour, ER [+details]


There are generally two types of phosphor used in the construction of the cathode ray tube (CRT). One type is a short persistence phosphor and the other is a long persistence phosp When either type of phosphor is struck by an electron beam of similar power, each will convert about the same amount of energy into light energy. The amount of time light energy dissipated from the long persistence phosphor is about 4000 times longer than for the short persistence phosphor. The light emitted by the short persistence phosphor varies over a much wider range in the color spectrum. As a result, the amplitude of the light energy dissipated by the short persistence phosphor is greater.