Measurement of Head Mounted Display's latency in rotation and side effect caused by lag compensation by simultaneous observation — An example result using Oculus Rift DK2

Latency is an important specification of the Head Mounted Display (HMD). In this paper, the authors proposed the measurement methods to evaluate the average latency as well as the effects/ side effects of the lag compensation. The Oculus Rift DK2 was selected for measurement. The results showed that the average latency of an DK2 without compensation was about 26.3 ms and that with full compensation was 1 ms. The rest part of the dynamic response was observed and evaluated by subtracting the measured latency from the observed trajectory. The side effect of Timewarp was observed as the spike like angular error.