Prism Light Guide Layout for Compact Virtual Image Displays

The patent removes the intermediate image formation step from the optical path. Instead of forming an intermediate image in the first prism and then guiding it through multiple reflections, the system directly transmits image light from the display element through the prism member to the exit, eliminating unnecessary optical steps that extended the optical path length

The patent inverts the conventional approach by not forming an intermediate image at all. Rather than using the prism to create and redirect an intermediate image, the system uses the prism member as a direct light guide, reversing the traditional imaging sequence to achieve a shorter optical path

The patent applies local quality by positioning the polarized light absorbing member specifically at the second outer surface of the second prism, which is the surface most susceptible to outside light entry. This localized treatment targets the specific area where outside light interference occurs most, providing effective suppression without requiring comprehensive coverage of the entire optical system

The patent introduces a polarized light absorbing member as an intermediary element between the outside environment and the image light path. This mediator selectively absorbs polarized outside light while allowing the image light to pass through, thereby suppressing see-through ghosts and outside light interference without blocking the desired image transmission