(Old News... thought I would re-post this, cuz it's pretty cool)
Tokyo based company Senseg, has a working prototype called the Feel Screen that can do just that. By touching different areas of the screen the user will feel different degrees of friction whether their fingers move or not.
The feeling could project contours and edges of things in front of you, and creates the sensation of everything from silk to rough terrain. Imagine feeling the detailed environments of your online game? Or the sensation of keys when using your smartphone to message? Dubbed the "Feel Screen," the technology doesn't rely on any moving parts or additions to the flat screen. This means it can be integrated into just about any flat screen device from your phone to your TV.
Although just a prototype, the company is hopeful that the technology will be widely available in the next 2 years. Just think of the possibilities...