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What is convergence? How can you go about fixing this problem? (1 Viewer)

kurt_fire

Stunt Coordinator
Joined
Dec 29, 2002
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183
i have no clue what convergence is. i'm looking into purchasing a 42" samsung HDTV later in the week and I've read about this TV having convergence errors...what exactly is this??

are these convergence errors easy to fix? also, does this TV require any tweaking in it's service menu?
 

kurt_fire

Stunt Coordinator
Joined
Dec 29, 2002
Messages
183
ok man i watched those videos but they really didn't tell me how I could go about determing if my soon to have HDTV is having convergence errors or how I can can fix them.

would they be easy to fix with a samsung 42" hdtv?
 

Steven.W.T

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Joined
May 20, 2004
Messages
90
Yeah I dunno, I'm new to this, sorry. Those videos just showed you what convergence is though.

Anybodu who actually have experience wanna help?
 

ChrisWiggles

Senior HTF Member
Joined
Aug 19, 2002
Messages
4,791
Well, a CRT-projection television, be it front or rear projection, works by having three picture tubes (guns). Each is one color primary: red, green, blue. The guns are aimed at the screen (the red and green are off-center, and are angled in) physically, to attempt to align the images from each tube. To create a white point on the screen, all three colors have to align perfectly. If any color is off just ever so slightly, you will have a white line or point with colored fringes, etc. OBviously, you can't get things perfect with just physical aim of the guns, not even close. Convergence allows you to manually, using a convergence grid and electronic compensation, adjust the image position on each tube face very accurately to match up the entire grid on the screen, so that across the whole screen all three colors are perfectly aligned. The key to getting thigs stable and long-lasting is to have good gun aim, and to use the most coarse adjustments first, like geometry, etc, and using the finer convergence adjustments as a last resort.

Digital displays, of course, do not have convergence errors, at least not in the same way. Single-chip DLPs do not have convergence errors, though you can think of rainbows as a type of convergence error, but in the time domain instead of physically.

Three-chip DLPs, and LCDs, each panel has to be perfeclty aligned, and often they are not, but usually this can't be fixed anyway without factory service. I hope that makes sense!
 

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