How LCD works...

I read in books about how LCD works...

The crystals are parellel when no potential is appled and the light passes through...
And when a potential is applied, the crystal vibrate and the light is scattered making a point appear on the screen....

Now the reason why the crystals oscillate is due to collision with electons traveling from one electrode to another(So I have read)...Now a mass of the electron is 1800 times less than a proton... and a carbon has 12 AMU and the liquid crystals are large organic compounds(more than 25 Carbons). The electrons is about 50,000 times lighter than the crystal... So the energy to disturb it is enormus....(10s of KV)

What exactly is happening ? Or hive I got something wrong ?

Nothing to do with electron collisions, crystal vibrations or scattering.

When a potential is applied to the plates, the rod-shaped molecules change their alignment, which affects the twisting of the polarized light. If the light does not change is polarization direction, it is blocked by the rear analyzer, and we see a black character (instead of silver background)

See these links for a reasonably good explanation:

http://www.liquidcrystaltechnologies.com/basop.htm
http://www.pacificdisplay.com/lcd_oper_basics.htm
http://www.wtec.org/loyola/displays/c3_s2.htm