After I connect my Thinkpad X200 to the 40W4500, the screen resolution is only 1360 x 768 . . . .Please comment if this is the maximum solution of the TV panel or limitation from the notebook.

Thank you 

It is limitation of your notebook display card, you should adjust it at "display content-->resolution".  
Sometimes, switch on TV first, then PC, your PC can detect the TV in easily way.

I found the relevant page in web. Go to check with Sony again to confirm.