Twisting the screen does not produce any ripples and neither does putting pressure on the back side of the panel (however, with a reasonable amount of force, you can make it happen, but nothing like some HPs and Dells I've seen, where you can make the entire screen ripple). Toshiba Satellite M645-S4050 Battery

However, one thing that doesn't seem too well designed is the back side of the LCD panel. Although it's difficult to get ripples to show, due to its slight convex shape, you can flex do...