this probably was the most tricky part so far. So when I tried the digitizer in the very begin of this project it was working fine even when I put the LCD panel between the digitizer and the digital pen (LCD was off). the tricky part was when I tried it again with powered panel, strange thing happened, the curser was shifting wiggling on the screen. the only idea came to my mind was that there is a magnetic field was affecting the wireless signal when the screen is on. I stripped the LCD as much as I can, but again still too much interference there. the only thing that I was able to remove more was the LCD back light, it was a CCFL based lamp not an LED one. this solved the problem, so I replaced it with LED light strip and it did the job.
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