Method and system for projection display with polarization selective reflectors
A method for displaying an image using an eyepiece waveguide includes emitting light from a first laser and emitting light from a second laser. The method also includes receiving light from the first laser at a first polarization selective reflector, reflecting, using the first polarization selective reflector, light from the first laser at a first angle to a scanning mirror, and receiving light from the second laser at a second polarization selective reflector. The method further includes reflecting, using the second polarization selective reflector, light from the second laser at a second angle to the scanning mirror, receiving light reflected by the scanning mirror at an input coupling port of the eyepiece waveguide, and projecting the image from an output port of the eyepiece waveguide.
1 . A method for displaying an image using an eyepiece waveguide, the method comprising:
emitting light having a first polarization state from a first laser;
emitting light having a second polarization state from a second laser;
receiving light from the first laser at a first polarization selective reflector, wherein the first polarization selective reflector is configured to reflect light of the first polarization state;
reflecting, using the first polarization selective reflector, light from the first laser at a first angle to a scanning mirror;
receiving light from the second laser at a second polarization selective reflector, wherein the second polarization selective reflector is configured to reflect light of the second polarization state;
reflecting, using the second polarization selective reflector, light from the second laser at a second angle to the scanning mirror;
receiving light reflected by the scanning mirror at an input coupling port of the eyepiece waveguide; and
projecting the image from an output port of the eyepiece waveguide.
2 . The method of claim 1 wherein the first laser is arranged to emit light in a first direction and the second laser is arranged to emit light in a second direction.
3 . The method of claim 1 wherein light reflected by the scanning mirror illuminates a portion of a composite field of view (FOV) through the eyepiece waveguide to form the image.
4 . The method of claim 1 further comprising:
emitting light from a third laser; and
emitting light from a fourth laser.
5 . The method of claim 4 further comprising:
receiving light from the third laser at a third polarization selective reflector;
reflecting, using the third polarization selective reflector, light from the third laser at a third angle to the scanning mirror;
receiving light from the fourth laser at a fourth polarization selective reflector; and
reflecting, using the fourth polarization selective reflector, light from the fourth laser at a fourth angle to the scanning mirror.
6 . The method of claim 5 wherein:
light emitted from the third laser is characterized by the first polarization state;
light emitted from the fourth laser is characterized by the second polarization state;
the third polarization selective reflector is configured to reflect light of the first polarization state; and
the fourth polarization selective reflector is configured to reflect light of the second polarization state.
7 . The method of claim 5 wherein light reflected by the scanning mirror illuminates a portion of a composite field of view (FOV) through the eyepiece waveguide to form the image, and wherein the image is a tiled image with four quadrants corresponding to light emitted from the first laser, the second laser, the third laser, and the fourth laser.
8 . The method of claim 1 wherein the scanning mirror comprises a two-axis scanning mirror.
9 . The method of claim 1 further comprising providing a prism, wherein the first polarization selective reflector and the second polarization selective reflector are embedded in the prism.
10 . The method of claim 1 wherein the first polarization selective reflector and the second polarization selective reflector are located at least partly overlying the input coupling port.