Patent ID: 11966056
Assignee: MATRIXED REALITY TECHNOLOGY CO., LTD.
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 18:
19. An optical system for an augmented reality apparatus, comprising:
an image source;
a bandpass polarizing beam splitter, relative to the image source, defining a beam splitting side adjacent to the image source and a transmission side facing away from the image source, the bandpass polarizing beam splitter being configured to perform polarization splitting on light incident thereon in a given wavelength range and allow transmission of light out of the given wavelength range, the bandpass polarizing beam splitter comprising a beam splitter substrate and a bandpass polarizing beam splitting film attached on the beam splitter substrate, each film structure comprising a first material layer of a first refractive index and a second material layer of a second refractive index, the first refractive index being lower than the second refractive index, and the first material layer being adjacent to the image source, and the second material layer being away from the image source, a thickness of each of the first material layer and the second material layer being determined depending on a wavelength or an integer fraction of at least one of a wavelength of red light, a wavelength of green light, and a wavelength of blue light;
a wave plate adjacent to the beam splitting side, and the beam splitter being configured to allow light emitted from the image source to be non-perpendicularly incident on the beam splitting side and be at least partially reflected towards the wave plate; and
a curved bandpass semi-reflector located downstream of the wave plate in a path of reflected light and configured to allow reflection of light incident on the curved bandpass semi-reflector in the given wavelength range and allow transmission of light out of the given wavelength range.