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HogPilot
Joined: 21 Jan 2010
Posts: 2383
TV/Projector: Vizio P702ui-B3, Pioneer Elite Pro-151FD & 111FD
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| Posted: Sun Aug 01, 2010 11:22 pm Post subject: CRT Design to Prevent Flicker? |
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Guys,
Someone posted this about CRTs over in the "other" forum. He has an alarming propensity to make crap up when it suits him, and since I know nothing about CRTs, I figure someone here would have to know if this were true, quasi-true, or total B.S.:
Quote:
When watching video in even semi-darkened room, some means of suppressing the flicker must be used. For decades the main technique used to make CRT TV displays viewable without flicker was to power the CRT B+ plate voltage from a high voltage power supply which imposed a 120Hz "ripple" that basicly caused a 120Hz brightness change in sync with the 60Hz room lighting.
As I understand it, flicker isn't even an issue unless you have some sort of pulse-driven display (like CRT or plasma) in a room with lighting that's also pulse-driven (like fluorescent lights), and the lights are operating on a different refresh frequency than the display. But either way, is the above description anywhere near correct? If anything is incorrect, would you mind correcting me or him and helping to get the facts straight?
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| ecrabb wrote: | | Curt Palme wrote: | | Interesting, Mac isn't returning my emails. Go figure. |
He's mad at us for making Hog a moderator. He took his ball and went home.
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Last edited by HogPilot on Tue Aug 03, 2010 2:10 am; edited 2 times in total
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Tom.W
Joined: 09 Mar 2006
Posts: 6635
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AnalogRocks
Forum Moderator
Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Mon Aug 02, 2010 4:29 pm Post subject: |
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I don't remember hearing anything about this for North American CRT RPTV's but Europe had some that were 100Hz. As far as I can tell that was only when you ran a 576i signal into them
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Tech support for nothing
CRT.
HD done right!
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Phil Smith
Joined: 08 Mar 2006
Posts: 7717
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| Posted: Mon Aug 02, 2010 4:36 pm Post subject: |
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Is this off topic? 
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AnalogRocks
Forum Moderator
Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Mon Aug 02, 2010 4:39 pm Post subject: |
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No actually it should be in the Direct view section 
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HD done right!
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HogPilot
Joined: 21 Jan 2010
Posts: 2383
TV/Projector: Vizio P702ui-B3, Pioneer Elite Pro-151FD & 111FD
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| Posted: Tue Aug 03, 2010 2:08 am Post subject: |
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Ha, dammit, I should probably re-post this over there. Thanks for the point in the right direction 
_________________
| ecrabb wrote: | | Curt Palme wrote: | | Interesting, Mac isn't returning my emails. Go figure. |
He's mad at us for making Hog a moderator. He took his ball and went home.
SC |
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AnalogRocks
Forum Moderator
Joined: 08 Mar 2006
Posts: 26706
Location: Toronto, Ontario, Canada
TV/Projector: Sony 1252Q, AMPRO 4000G
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| Posted: Tue Aug 03, 2010 2:17 am Post subject: |
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Why didn't you just ask me to move it?
EDIT: Done!
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Tech support for nothing
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HD done right!
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HogPilot
Joined: 21 Jan 2010
Posts: 2383
TV/Projector: Vizio P702ui-B3, Pioneer Elite Pro-151FD & 111FD
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| Posted: Tue Aug 03, 2010 2:37 am Post subject: |
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| AnalogRocks wrote: | Why didn't you just ask me to move it?
EDIT: Done! |
Thanks 
_________________
| ecrabb wrote: | | Curt Palme wrote: | | Interesting, Mac isn't returning my emails. Go figure. |
He's mad at us for making Hog a moderator. He took his ball and went home.
SC |
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