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Technique for Extending the Useful Life of Cathode Ray Tubes Disclosure Number: IPCOM000058829D
Original Publication Date: 1988-Dec-01
Included in the Prior Art Database: 2005-Feb-15

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Leise, LE [+details]


This article describes a technique to counteract the characteristic decay in brightness that CRT-based monitors experience as they age. Typical cathode ray tubes (CRTs), both color and monochrome, exhibit a slow degradation in brightness as they age, end of life being when they reach 50% of their initial brightness. This brightness decay is caused by a decrease in the cathode and phosphor emissions. The cathode emission is the major contributor as the depletion of cathode material reduces the available electrons that can illuminate the CRT phosphor. A technique for counteracting brightness degradation is to add a component to the monitor that has the property of decreased output over operating life which is similar to the CRT.