Dead Pixels Tester LCD
So you just bought a superb ultra-flat 25¾" LCD monitor, but it looks like there are a few 'spots' on it. Depending on how many and it'll mean return to the vendor or live with it. Or you could be about to buy one in a store and want to make sure there aren't any dead pixels. Just come to this page !
Testing for dead pixels is very simple, there's nothing to install. All you need to do is click on all the links below to load the various test pages and look carefully at the images for any sign of dead (black) pixel, lit (white) pixel Dead or Lit pixels as visible on the test images or also colored pixel Colored pixel as seen on some LCD screens (here yellow and blue, even if it's difficult to tell the colors).
The links below will open a JavaScript window full screen. If your browser cannot do JavaScript or won't scale full screen either, you still have the option, once you are on one of the pages below, to right click it, do [Set as wallpaper] and hide all your windows (Press [Win][D]). If you still don't see the dot pattern covering the full screen, you need to 'tile' the wallpaper with the following method in Windows: right-click on the Desktop, chose [Properties] and then chose [Tile] as the [Picture Display option]. Once you have tested all the images, go put some better looking wallpaper.
I See Dead Pixels...
Now don't confuse a dead pixel with a fleck of dirt on the screen or a piece of dried snot. Wipe gently your screen with a dry clean rag before using the test procedure. How can you tell the difference ? Easy: move your head to the side of the screen: if the error moves to the next pixel, it's dried snot ! If you notice dead pixels, sometimes you can massage them back to life: just rub the screen by pressing a finger gently through a rag around the pixel. No guaranty but sometimes it works; LCD monitors are fairly fragile and easily scratched, so take it easy.
So even if you are lucky enough to not have any dead pixels on your monitor, you can still come back to this page when you are cleaning it in order to check that all the specks are gone. Some people pretend that you can also bring a pixel back to life by alternating its color very fast. I'm not convinced but you can always try to leave the 'cycle them' window open overnight... It may bo the job if it doesn't kill your video card or if your monitor doesn't go in sleep mode from sheer boredom.
Normal Without JavaScript
Click below. If the window that opens isn't full screen, press [F11]. When you are done looking closely, press [Ctrl][F4] or [Alt][F4] to close the window and proceed with the next one. Click below, then press [F11] to view full screen followed by the [Backspace] key to come back to this page before you try the next one.
* Black&White
* White&Black
* Blue&Yellow
* Yellow&Blue
* Cyan&Red
* Red&Cyan
* Green&Magenta
* Magenta&Green
Extra: Cycle them
* Black&White
* White&Black
* Blue&Yellow
* Yellow&Blue
* Cyan&Red
* Red&Cyan
* Green&Magenta
* Magenta&Green
Extra: Cycle them
Some advice about getting the best out of your screen:
* Use it at its highest color mode (32 bits) to avoid dithering (display options of the control panel). 24 bits is okay, but avoid 16 bits modes.
* Use it at its highest frequency to lower flickering (advanced display options of the control panel), although the frequency is a lot less important for LCD than for normal monitors. Note that pivot monitors sometimes have lower frequencies in vertical position than horizontal and the driver will refuse to rotate the image if the horizontal frequency is set too high.
* Unlike classic monitors, LCD screens have only one optimal resolution: the highest. If your screen is given for 1200x1024, don't try to use it at 1024x768 even if characters get too small to read, instead change the default system font size in the advanced display options of the control panel; you'll get better quality and readability this way.
* If both your video card and your monitor have classic analog (VGA) and digital (DVI) outputs, always use the digital cable.
* The images above can also be used to test the bleeding of the pixels onto one another. If you look closely you should see a fine tiny mesh. Otherwise if you see a grey mess or very flickery lines, then it's a sign of lack of quality from the screen or the video card. There can also be a lot of quality difference from one video card to the next, even on identical models.
* Note that CRT screens don't exhibit 'dead pixel' problems. It's specific to LCD or plasma screens.
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