This is from an Email Fei just sent me and answers a lot of questions :
Many people are asking why we dynavin use 6.2’’ TFT LCD in DVN-E39 while using 7’’ TFT LCD in other headunit like DVN-E46.
I think I need to give some information in details to explain the reason:
Firstly I paste installation picture here to show how to install BMW factory navigation in the BMW E39 car with original cd/cassette player.
From above pictures, you can see that you need to cut original stereo frame and add another metal frame to fix the BMW factory navigation headunit.
To make clients who gets our products make an easier installation we needed to make the chassis part of our headunit just fit in the original stereo frame. See the picture below:
From the picture, we can see the distance from upper part of the chassis to the top part of the front panel is about 18.84mm. and it is just same with the corresponding part of the original stereo frame. So the cd/dvd slot to the top front panel must be 28.2mm, and for this reason, the distance from the cd/dvd slot to the buttom of the panel is not enough for 7’’ TFT LCD.
Let’s see some pictures that DVN-E39 installed in the original stereo frame :
Everything just fit in. Even don’t need to loose and tight any screws when doing installation. There will be 2 clips that fix unit to the frame when the unit is installed in. Using release key to remove the unit if you want.
Why many people feel the screen is very smaller than DVN-E46? That’s because the front panel of DVN-E39 is much more wider and higher than DVN-E46. but the difference of the display area of 6.2’’ and 7’’ LCD is small.
The Screen of DVN-E39 is a little smaller than DVN-E46, but resolution is exactly same:800*480
P.S ( by me ! )
Hope this clears lots of things out as it is detailed and also makes people understand why took Dynavin so much time to develop it.