Oculus, an American VR business, began shipment of the 2nd generation product, DK2.
According to OLED info, pre-order of DK2, the 2G product of Oculus, began in March, 2013 and 45,000 units were ordered by June, 2014. Ten thousand out of 45,000 units has been shipped on July 1st and the remaining will be shipped in the middle of August.
Oculus used LCD display for the first prototype but OLED display was used for the new product on the market. A video clip uploaded on Oculus’ homepage (http://www.oculusvr.com/) explicitly shows why Oculus used the OLED rather the LCD for faster response speed. Also replacing the LCD with the OLED greatly reduced motion sickness due to 3D while adding a positional tracking feature by mapping you movements with a camera and infrared light.