The filing indicates that Samsung aims to provide a more immersive content experience that is not constrained by the wristwatch's screen limitations. It suggests that the information displayed on the projection display may differ from that on the display module, allowing for more diverse viewing options. For example, viewing movies sent through chat apps or making video calls could become more convenient with the addition of a camera module.
As this technology advances, we may see further improvements and changes to the smartwatch.
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-Anurag