I'm using the version 0.5. In fact having access to the screen buffer from Java would be sweet for what I want to do. I'm just trying to have fun with the LCD Screen and play with pixels "switching" to simulate different gray levels. And so to have a way to display more than Black or White colors.
Anyways, thanks for your reply and I will look directly at the LCD source code, that's great. Also I found the Graphics class (javax.microedition.lcdui.Graphics) very usefull for what I want to do. My only concern is of course not having direct access to the screen for performance issues but I'll check the code in sourceforge, I did not think to that.