Birdbath Optics

The AR Birdbath optic engine offers exceptional image quality and a wide field of view, it is adopted by many well-known entertainment movie-watching glasses such as Xreal air, Rokid air, Huawei vision glass and our own AR glasses.

The birdbath combines two main optical components, a spherical mirror/combiner (part-mirror) and a beam splitter. The spherical mirror is responsible for correcting the light from the source, while the beam splitter redirects the light towards the user's eyes. 

Compared to waveguide optic engine, the AR Birdbath boasts exceptional clarity and color accuracy, supporting a field of view (FOV) of over 50 degrees for a highly immersive AR experience with affordable cost. In addition, the Birdbath optic engine is incredibly lightweight, with a single module weighing just a few grams, making it easy to integrate into AR glasses without adding significant weight.

So, what parameters should you consider when choosing a suitable birdbath optic engine? Here are some tips.

FOV

The Field of View, or FOV, is an essential specification of AR glasses. It determines the range of virtual objects that a user can see through the display of their glasses. In simplified terms, it's like the "window" through which the user sees the virtual world.

Exit pupil distance

Exit pupil distance, also known as eye relief, is the optimal distance between the eyepiece and the user's eye that provides the best viewing experience. In AR glasses, it's critical to ensure that the exit pupil distance is optimized to maximize comfort and minimize eye strain without affecting the quality of the image.

Eyebox

The Eyebox, or exit pupil diameter, is the area where a user's eyes can be positioned while still seeing the full field of view. If the eyebox is too small, it can cause discomfort and disorientation, while too large an eyebox can lead to decreased image quality and a bulkier design.

MTF

MTF, or Modulation Transfer Function, is a measure of the optical system's ability to transfer contrast from the object to the image plane. In AR glasses, MTF determines the clarity and sharpness of the display, which is essential for providing the user with a realistic and seamless AR experience.

Adjustable diopter

This is an innovative technology that allows myopic users to manually adjust the birdbath optic engine to see virtual images clearly without wearing nearsighted glasses or purchasing prescription lenses separately, please refer to our AR-FOV43-A glasses. This feature is also supported by our VR pancake optic engine.

We are professional manufacturers since 2016. Below is a paritial list of our birdbath optics that have already been launched.