The transition to full-fledged AR glasses with all-day wear necessitates a high dynamic range display that works equally well in dimly lit indoor and mid-day sun outdoor spaces. Laser beam scanning (LBS) is an ideal (small size-to-power density, weight-to-performance ratios) light source for the application. Light coupling from the source into the optics can help to reduce battery size. A recent RGB laser module prototype represents a significant breakthrough in miniature modules. Its size is only 7 × 4.6 × 1.5 mm, allowing it to fit in standard, lightweight eyeglass frames.
By halving the size of the projection light engine, researchers move one step closer to making AR glasses a reality for consumers. The laser module combines three powerful lasers with wavelengths of red (640 nm), green (520 nm), and blue (450 nm) in a rugged surface-mount package. The package is hermetically sealed to prevent contamination of the laser chip-on-submount emitters in the module.
AR glasses must not obstruct peripheral vision or eye contact for users to interact with the real world. Narrow-beam lasers are an excellent choice for near-to-eye (NTE) system waveguides. Light can be precisely uncoupled from a scanning mirror, through the relay optics, and onto the waveguide entrance using LBS.
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