Why shows the effect shown in the video below left-right asymmetry?
Imagine you were dragging on a rubber sheet instead of the LCD screen. The sheet would stretch out a bit behind the stick and bunch up slightly in front. The pattern would look exactly like what you're seeing on the LCD.

A LCD screen works by changing the polarization of light as it passes through a very narrow gap between 2 plastic sheets. This gap must be very precise, because if the gap changes the polarization will change. As you drag the chopstick around on the screen, you're disturbing the top sheet, which is changing the thickness of the gap. This causes a visual disturbance.