Apple has filed for a patent on a touch-surface keyboard with tactile feedback, US Patent and Trademark Office documents show. A problem with typing on touchscreens is that users must typically look at the keys to know what is being pressed; by contrast, most physical keyboards allow people to gauge where their fingers are through bumps and ridges. Apple's solution would pop up an "articulating frame" whenever typing is engaged, and move it out of the way when it is not.
