Nvidia Shows 16000Hz Refresh Rate Prototype AR Display
Virtual reality requires a high-performance system to maintain a comfortable experience, but if we are to achieve true immersive AR in theory, it may ultimately require higher levels of performance.
Although virtual reality can achieve comfortable and immersive performance under a delay of less than 20ms, augmented reality requires almost zero delay. In order to keep the real world and the digital world in very close synchronization, AR's demand for high-frequency output is very strict.
To this end, Nvidia showed us a prototype AR display with a refresh rate of up to 16,000 Hz. In contrast, the refresh rate of traditional AR display is only 60Hz (the current high-end VR head is 90Hz/120Hz).
As you can see from the video, they superimposed white digital boxes on real chessboards. The current display refresh rate is 60Hz, and you can see that digital information is difficult to target in real-world objects because the speed of movement means that the latest image rendered to the screen has deviated significantly from the real world before rendering the next image. Object.
In contrast, since the 16000Hz display is updated so quickly, the image can be maintained at high speed and re-render regardless of the camera's moving speed, and can be almost completely locked on the real-world grid.
At this week's GTC 2017 conference, Nvidia demonstrated the latest results of the collaboration between the Chapel Hill University of North Carolina, the Nvidia Institute, and InnerOptic Technology. Nvidia's Morgan McGuire stated that the motion-to-photon delay in the 16000 Hz system is 0.08 milliseconds, which is more than 100 times faster than the current high-end VR head.
Interestingly, the source input for the 60Hz display and the 16000Hz display in the experiment remained at only 60Hz. This means that researchers have been able to achieve this kind of ultra-low latency interpolation and do not need to match 16000Hz display with 16000fps source input, because this is not practical in reality.
A detailed study was published in the IEEE Transactions on Visualization and Computer Graphics in the title "From Motion to Photons in 80 Microseconds: Towards Minimal Latency for Virtual and Augmented Reality." The author explained in the abstract that the system is a useful platform for examining the trade-off between image quality and other factors.
We describe an augmented reality optical see-through display based on a DMD chip with an extremely fast (16 kHz) binary update rate. To convert binary pixels to perceivable gray levels, we combine post-rendering 2D offsets with real-time tracking updates through a new modulation technique. This processing element implemented in an FPGA (Field Programmable Gate Array) is installed in the head tracking device together with the optical display element, and the user can superimpose the composite image in the real environment through the head tracking device. The combination of near zero-latency mechanical tracking and reconfigurable display processing brings only an average of 80 microseconds of end-to-end delay, which is also an extensive test platform for very low latency display systems. We have used this platform to examine the tradeoffs between image quality and cost (ie, power and logic complexity) and found that we can maintain quality with a fairly simple display modulation scheme.
16000Hz may be close to the theoretical target value of AR, but even a lower refresh rate can still bring us a comfortable AR experience. The HoloLens, which is considered to be the highest quality currently available, has a refresh rate of just 60Hz. Although visual performance is not perfect, it is already at an acceptable level. Xiao Bian believes that with the continuous optimization of the AR head shape design, the user's head will move faster and faster, AR glasses need to match this speed, so we hope that the performance of the display can continue over time improve.
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