Apple’s iPad has been a transformative tablet device, but it was cursed from the beginning with a low-resolution display. That changed today with the launch of the iPad HD, Apple’s third-generation tablet, which adds an ultra-high resolution Retina Display and LTE 4G connectivity.

Apple CEO Tim Cook unveiled the iPad HD at a media event in San Francisco today, where he also announced an updated Apple TV set-top box. “We think the iPad is the poster-child of the post-PC world,” Cook said.

Almost boasting, he reminded the audience that Apple sold 15.5 million iPads last quarter, more than any PC manufacturer sold in their computer lines.

The iPad HD boasts a new screen with a resolution of 2048 by 1536 pixels, a huge bump over the previous iPad’s 1024 by 768 screen. Apple says it features 264 pixels per inch, and it’s enough to call it a Retina Display since you’ll be holding the device farther than you would an iPhone.