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Re: RPTV advice

Posted by Steve W (A) on December 4, 2001 at 10:24:38

In Reply to: RPTV advice posted by mchad on December 4, 2001 at 09:21:08:

Screen burn in is really more a function of how high you set the brightness and contrast on your set. Many people set their set in the highest and brightness mode which not only produces poor picture quality, but unevenly burns the phosphors on the crt guns. The warning you read was really more of a disclaimer because of worst case situations. Set contrast and brightness below 50 to 60% on most of your viewing and not only will you get a much better picture, but I don't think you will ever experience burn-in. Quality 4:3 sets are the Sony KP61HS30 or the KP53HS30. In the Yahoo Sony HDTV groups, there are 2500 members and thousands of posts and I have yet to hear of anyone having burn in problem due to watching too much of one format or another.

Here is a excerpt from a Corning white paper on the life of CRTs with
respect to usage:

"CRT life, for all practical purposes, distills down to cathode life and phosphor life. The
cathode life is primarily effected by cathode loading or cathode current density. Specifically,
oxide cathode life is optimized at about .3 A/cm2 due to temperature effects (.. .the cathode life
is enhanced if the cathode operates between 1000 and 1130 degrees K). Phosphor life decreases
as a function of electron bombardment, The amount and rate is unique to each phosphor. The
life of the phosphor is also effected by the tube diameter. The time for the tube brightness to
decay by 50% for a 12” tube operated at 200 micro-amps (.3 A/cm*) may be 18,000 hours,
while a 5” tube operated at the same current would only take 1,500 hours to decay to this 50%
value. The smaller display would, however, operate at twelve times the luminance of the larger
display."

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