I bring you this application that fix your "broken" (lazy/stuck) pixels. This application is developed by Marce_82 and The Sixth Halcon and is compatible on PSP Fat and Slim. It incorporates a graphic design and the app is in English so there's no excuse to unbrick your pixels!
Extract the RAR file, then copy the content of "MsRoot" in the root of your PSP.
You can download UltraScreen v1 by clicking here.