How to display diff only with lines that differ and not display lines that are exactly the same?

Hi,
I use Vim 7.4 on Windows 7.

I have got file1:

one
two
three
four

and file2:

two
tree
four
five

Now I start vim and create a diff of this two files with the following commands:
:e file1
:vert diffsp file2


Diffs are displayed like:
a) Text line from one file not available in second file is colored blue.
b) Text line that is similar between files is colored pink.
c) Text line that is exactly the same is with no background color.

Is there some command to display only "blue" and "pink" lines without "no background color"?

Above sample is very simple. I work with files with 5000 lines and only a few of the lines are different. It would really help me to display only lines that are different (missing lines = blue colored and differing lines = pink color) and without all of the lines that are exactly the same.

How to do this in vim?

Thanks

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