Huawei is calling its latest and greatest Android smartphone "the world's fastest smartphone," which is appropriately named the Ascend D Quad. Aside from its 1.5GHz quad-core processor, the Ascend D Quad's display also shines. With a resolution of 1280x720, the 4.5-inch display has an impressive pixel density of 330 pixels per inch. That's even denser than the Retina display found on iPhone 4/4S, which has 326 pixels per inch. In the imaging department, the Ascend D Quad sports a pretty standard 8-megapixel rear camera and a 1.3-megapixel front camera. Besides Android Ice Cream Sandwich, which now is expected on most new devices, the Ascend D Quad also comes with other fanciful technology, such as Dolby Digital 5.1, Audience earSmart, and Huawei's proprietary power management system that promises up to 30 percent energy savings compared to industry average. At 8.9mm, the Ascend D Quad isn't nearly as thin as the 6.68mm Ascend P1 S the Chinese company announced earlier this year, but it's the most compact 4.5-inch smartphone, if the company's tweet is to be believed. For the sake of comparison, Samsung's Galaxy Nexus has the same thickness at 8.9mm, but its display is slightly larger at 4.65-inch. Just like the Ascend P1 S, the Ascend D Quad has a beefier brother with a longer lasting battery pack. At 10.9mm thick, the Ascend D quad XL comes with a 2500mAh battery (the non-XL version has a 1800mAh battery) that will last 2 to 3 days, according to the data published by the company. A lower-end of the device is also available. The Ascend D1 will be powered by a more modest 1.5GHz dual-core processor with a 1670mAh battery. Both the Ascend D Quad and Quad XL will be available in most parts of the world in the second quarter of this year, while the Ascend D1 will be available starting in April. As usual, pricing remains a mystery. Check out Engadget for slides from Huawei's announcement. [youtube http://www.youtube.com/watch?v=z8SWGQiEWrw] Photo: HuaweiDevice