Find dead pixels and sub-pixels on your display. To switch between colors swipe the screen or touch the screen longer to adjust the brightness. LCD-Test Pro can try to fix the persistence of dead pixels. You'll find it in the market, too.
Download the free .apk file of LCD & AMOLED-Test 2.1 and have a look at users' reviews on Droid Informer. This installer takes up 214 KB on disk and it can be launched on Android devices 2.3 and above. The antivirus report proves that the app is safe. This application was originally created by Tim Lappe and it belongs to the Tools category.
Over 100K users downloaded LCD & AMOLED-Test and the most recent update was released on Sep 18, 2012. According to the latest data, the app is rated 4.2 on Google Play.