Amazon will be launching its first '3D Smartphone' at an event scheduled for June 18, 2014 in Seattle. Rumors and speculations surrounding this one-of-a-kind smartphone are rife. Meanwhile, CNet has come up with a list of already available 3D smartphones in the market, across the globe. Here is a look at 3 such devices:

HTC Evo 3D

HTC released its first 3D smartphone, Evo 3D, in the U.S. around the mid of 2011. This smartphone came with a dual 5 megapixel camera on the rear to facilitate capturing 3D photos and 720p HD videos. In addition, users can play animated games in 3D without the need for 3D gadgets/glasses. Nevertheless, due to the substandard photo quality and the not-so-impressive 3D gameplay, this phone did not strike a chord with the users.

LG Optimus 3D

LG released its Optimus 3D smartphone in the U.S. during the summer of 2011. This phone was also known as LG Thrill 4G. In many ways, this smartphone was similar to HTC's Evo 3D handset. The Optimus 3D featured the same dual 5 megapixel camera to record 720p 3D videos. In addition, the device also boasted a glasses-free 3D display for gaming and viewing 3D data.

It is worth noting that, LG did not stop its innovation with the smartphone. It ventured into 3D tablet in the form of LG Optimus Pad. However, this tablet was a failure as well.

LG Optimus 3D Max

LG introduced Optimus 3D Max in 2012. This 3D smartphone featured a unique 3D convenience key, which helps in pulling up 3D games and apps. However, this phone bit the dust because of its poor overall performance.

Amazon 3D Smartphone

Amazon's upcoming 3D smartphone will sport a 4.7 inches display, with 720p screen resolution. The handset will be powered by a Qualcomm Snapdragon processor that houses a good 2 GB of RAM. This unannounced phone will also feature a 3D software interface and a whopping 13 MP rear-facing camera unit.

Moreover, this device will house a unique 'six individual' camera units and a heavily skinned version of Google's Android operating system. The unique interface with 3D effects is reportedly achieved by enabling four front-facing infrared cameras that assist in tracking the position of the user's head with respect to the device's screen. In addition, the device will feature several sensors to get the best out of the captured image. The unique selling point is its gesture-based controls that will enable easy access to menus and other related information.

What do you think of the 3D Smartphones? With a history full of failures, can Amazon's 3D smartphone shake things up? Feel free to leave a comment.