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In Reply to: Re: Shadow effects on widescreen tube televisions posted by jeechung on October 11, 2001 at 06:05:23:
He looked and is now contacting Panasonic. I'll find out early next week.
Follow Ups:
I looked at my TV closely over the weekend and I did notice some sort of fringe lines on EITHER side of brigh images at a distance of about 5mm (~1/4 inch). This was not the SVM artifact that had I suspected earlier.I am not sure what's causing it, but it was noticable only when the brightness setting was very high. With the brightness setting turned down to optimum viewing, it was not visible. In any case, while I was puzzled, but it wasn't bothersome. What is still more visible was the SVM artifacts added by the TV broadcast (FOX baseball last night, for example)
The engineer is still consulting with Panasonic; I asked him to be sure what the tolerances for such things are. His conclusion, and that of others is that these are caused by the scanning coils. Note they curve in at the top and bottom, so they are slightly circular in their profile. They are most noticeable on 32inch and 36inch widescreen. He says once you have seen them once you will always see them so sorry for that.I agree with your observation about bright images. Even at low brightness settings though, with a light coloured background (a cream coloured wall, sky etc...) they are visible.
I'll let you know when we have the tolerances.
Panasonic say it's the extra fittings on the shadow mask behind the CRT, and is present on all of their widescreen Quintrix. I notices on other makes too, but Sony apparently have a different mounting method, so their imperffection runs horizontally top and bottom, but are smaller in dimension.
Such is life, it's still an exceptional television, especially on progressive scan!
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