Bright Green Pixel When ALL Black?

Question

Bright Green Pixel When ALL Black?

I just bought a new 23" HD display... this thing is a thing of beauty... I had a 20" that I gave to my brother... what a difference that extra 3" makes...

Question - I noticed that when the screen goes all black, that there are three pixels that are bright green... well, now there are two... I was able to lightly massage one of them out... but two remain...

I imagine that this indicates that the red and blue aren't turning on there, leaving ONLY the green? The thing that's confusing me about it is that when I turn the red and the blue on by themselves, there doesn't appear to be any black in that area... I can clearly see a dead red pixel elsewhere on the screen...

Am I correct in my analysis of the green bright pixel or is it something else?

Dual 2.5 Ghz G5, 1.5 GB RAM, 23 Apple Cinema HD Display, Mac OS X (10.4.3)

Posted on Nov 22, 2005 6:44 AM

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Answer 1

Nov 28, 2005 2:09 PM in response to Justin Surpless

All set...

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Answer 2

Phil Ta

Level 6

10,400 points

Nov 28, 2005 6:42 PM in response to Justin Surpless

Each pixel is made up of 3 subpixels - red, blue, green.

The green subpixels you see on a black screen are stuck pixels. They are always green, hence "stuck." Now if you display a blue screen, those pixels with the dead green subpixel will show both blue and green (instead of only blue), which makes cyan. Or on a red screen, it'll show both blue and red and make magenta instead of showing pure red.

A dead pixel or subpixel is one that is always black, which is what you're seeing with the red pixel, which appears as a black dot on a red screen. So if you try showing pure magenta, that pixel will only appear blue since it can't display the red.

Anyway, I think you have too many bad pixels which warrants an exchange.

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Answer 3

Nov 29, 2005 12:12 AM in response to Phil Ta

Exchanged it and the new one is perfect...

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