I Have An LCD TFT Flat Panel Display, When I Apply Slight Pressure Why Does The Screen In That Area Change?

I know there's nothing wrong with my computer, all I wanted to know is WHY it does it.

L C D : Liquid Crystal Display.

Pressure alters the light passage properties of the crystals in the liquid.

dear child its so called is lcd, before buy you should be aware of these things , all lcd , even the calculator screen when u press it ghanges the colour of that part. isn't it. comon tell me how you got your lcd , iam sure that your father has given you which is a gift for him,, even he has not bouthered to search in market.