Yunbo Li, the way I would proceed is as follows. Take the attached image, from here and take a look at the most vital IC's that are listed, they do not include the smaller ones, i.e. touch screen controller etc. Do a search on those manufacturers and numbers. On the once you do not get an exact match, you can at least use the class to get more information. Here for example, is the datasheet for the SKY77500 which is very similar to the Sky77541 used in the iPhone 4. I know it is tedious, but could be a rewarding process. BTW, there are no LED's in LCD's, those two are different all together. Hope this helps, good luck.
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