2023 . 03 . 17
Source:Changchun Maxvision Photonics Co., Ltd
With the rise of video games, entertainment, and online meetings, augmented reality is widely used in the creative industries. Especially after the outbreak of the new crown pneumonia epidemic, online meetings and online courses with social networks in education, medical care, industry and other fields have developed rapidly, providing broad prospects for the application of AR glasses.
At the same time, optical system testing: Thanks to optical waveguide devices in microdisplays and AR glasses, AR technology is advancing with each passing day, image quality is better, and wearables are lighter in weight. Augmented reality wearables such as smart glasses enable users to see images generated by the virtual world.
With the breakthrough of AR in the field of mobile technology, capital investment in the market has promoted the research and mass production of different AR glasses products. In the consumer market, we can see new products being released all the time. AR glasses OEMs need to compare the specifications of each product side-by-side, and they are also interested in knowing the nominal parameters of the imaging quality of similar products.
We have heard that AR glasses are needed in many cases to measure eyebox, line-of-sight, FOV, and image distortion because customers want to validate their product specifications to see if the DOE provided by the supplier can meet the imaging results provided by the actual specifications. Therefore, optical waveguide design components are an important part of the evaluation of the display image of augmented reality glasses.
Optical waveguides are widely recognized as one of the promising ways to enable affordable augmented reality (AR)/mixed reality (MR) devices, which, combined with small-scale image quality, can provide a fully immersive user experience. Multiple optical structures – waveguides, reflective beam combiners and beam splitters can be used to make AR wearable devices. Each architecture has different advantages in terms of appearance (size and weight), visual comfort, optical quality, and cost. In all of these areas, existing architectures need to weigh the pros and cons or fail to take full advantage of them. Portable and thin form factor is a key factor that can be widely adopted in the market, and the optical path design of optical waveguides is one of the advantages. The use of high-quality and high-refractive index glass enables wider FOVs and enhances the light guide of wearable devices.>
To implement virtual components that blend with the real environment, the optical system needs to be designed with the consideration of pupil size, virtual image, optical distance to the eye (line-of-sight), image magnification, and field of view. Due to the use of optical elements such as mirrors and beam splitters, the entire device becomes bulky and it is difficult to install various components in a narrow space. The main part is the input and output optocouplers, which are made of high-precision nanograting diffractive optics. DOE and HOE are two commonly used light guide technologies in wearable devices today.
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