h a l f b a k e r yI never imagined it would be edible.
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You receive your new 24" widescreen LCD, and horror of horrors! There are 2 dead pixels, one permanently black and one stuck on red. It's not covered under warranty, and you don't want to return it, so what to do?
Go to your graphics card driver menu, and select 'dead pixel removal'. The screen turns
white, with a single group of 9 pixels surrounded by a black ring. You centre this ring over the dead black pixel, and click. You perform a similar process (on a black screen with a red ring) for the red pixel, and skip the green and blue steps.
Now, before an image from the framebuffer is displayed on your monitor, the pixels surrounding the dead black pixel are slightly brightened to compensate, and the pixels around the stuck red pixel have their red values slightly reduced. Ditto for stuck green and blue pixels, or dead red, green or blue pixels, or combinations thereof.
Dead Pixel Tool
http://www.softpedi...-Pixel-Tester.shtml
Exersize your dead pixels! [RXAaron, Jan 29 2008]
How To Fix A Stuck Pixel
http://www.wikihow....l-on-an-LCD-Monitor
I have no idea if this works, but it seems reasonable. Covers several techniques. [Amos Kito, Feb 03 2008]
[link]
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This would increase the contrast between the dead pixel and its surroundings - wouldn't that make it more obvious? |
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I wonder if one couldn't get a pair of tiny tweezers and pinch in the screen around the pixel, squashing it out and slightly stretching the ones next to it. |
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//so what to do?// Buy another 24" LCD and use this one for a thin client in the kitchen. |
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Sounds like a good idea, if the contrast were increased you would simply have to reverse the process. There are, however, tools which can assist in recovering a dead pixel by "exercising" the transistor which is stuck in the open position (dead pixel). I assume you are aware of this seeing as how you tagged the article "frame-buffer side dp mitigation." |
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That software only helps find the faulty pixel, I think. |
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The cheap solution would be a mid-grey stick-on pixel which you stick over the offending pixel. |
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Beauty spots for tft monitors? I just hope the offending pixel is in one of the corners. |
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One could reduce the price of these LCD TVS by halving or quartering the number of operating pixels and compensating by this mechanism. Perhaps a handful of optimally placed pixels would allow one to get a general idea of what was going on, for the low low price of $19.95. |
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It occurs to me that the same principle described here could combat the "swiss cheese effect" seen on elderly postings on the Halfbakery, in which annotations disappear and the stream becomes less coherent. Disappeared annos will be replaced by the Cheese Pixel Pixie (named as the author), with the verbiage extrapolated from the anno stream, other similar streams, and other similar things found here and elsewhere. |
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if you are going to make a big deal over 2 dead pixels you can just give the TV to me. Seriously, I need a new TV, my current one is tiny and the sound quality is horrible. At least is displays in color |
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This seemed too good to be true. So I tested it on my green dead pixel. It works! This idea is simply brilliant.
It's really easy to test too. Open up paint program and fill your canvas with various basic colors. Notice the dead pixel pop out with certain colors. Now grab a 1px wide brush and carefully dab black color into it (if you miss try again). |
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Once you succeed the dead pixel's intensity will decrease by at least half. I tried dabbing different colors on it, but black worked the best for me (which kind of makes sense) |
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This idea reminds me of bad blocks mitigation in hard drives. Same kind of a deal. |
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By the way, no reason why the monitor couldn't do this internally - even if video card's frame buffer didn't support this. |
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I wonder what the difference between a ring of 4 and a ring of 9 might be? I guess I can find out! |
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//intensity will decrease by at least half//
[ixnaum] Are such dead pixels actually "dead" (say an LCD shutter stuck "open")? If a paint program blotting technique partially obscures the dead one, that one was Mostly Dead. Still, I'd try combinations of every suggestion. |
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Every pixel has three subpixels, red, green, and blue, each controlled by a special transistor (like a shutter) in the area. A subpixel can be either dead (black) or stuck (full intensity red, green, or blue). |
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I have never actually seen a dead-dead pixel yet. But it's true I didn't look very hard (maybe they are harder to notice)
All the ones I've seen so far are stuck open. R,G, or B. The technique I describe does work for those stuck open. |
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