(CNN) -- Apple rolled out a high-definition iPad on Wednesday with a display screen that promises to be dramatically sharper than the current model, the iPad 2. "It is amazing," Apple CEO Tim Cook said at a San Francisco unveiling. "We've taken it to a whole new level, and we are redefining the category that Apple created with the original iPad." The new 9.7-inch display screen will feature a "retina display" of 2047 by 1536 pixels, compared with the current model's 1024 by 768 pixels.