Thanks, I know this application. I wanted more dim my screen to save battery, but i suppose this application using some kind of software solution rather actually dim a leds backlight of screen.
I was forced not to off(lock) my screen, because of some kind of bug with bluetooth communication (phone vs bluetooth gps module). This bug causes a communication freezes. That is why I've used a screen dim.
Now I found application which is resistant of this bug.
Thanks for trying to solve my problem