Projection display

摘要

The present invention provides a projection display (10) for projecting a color image to a viewer (12) overlaid on a real world scene viewed through the display. The display comprises an image generator (16) for generating image bearing chromatic light for injection into a waveguide assembly (28) at a first range of field angles (44) and a second range of field angles (46). The waveguide assembly comprises a first waveguide (30) having a first input diffraction region (32) arranged to couple image bearing chromatic light in the first range of field angles into the first waveguide to propagate by total internal reflection; and a second waveguide (40) having a second input diffraction region (42) arranged to couple image bearing chromatic light in the second range of field angles into the second waveguide to propagate by total internal reflection. The first and second waveguides have first and second output diffraction regions (48, 50) arranged to output image bearing chromatic light from the respective waveguides for projecting a color image in the first and second range of field angles to a viewer overlaid on a real world scene viewed through the waveguide assembly.

主权项

1. A projection display for projecting a colour image to a viewer overlaid on a real world scene viewed through the display, the display comprising:
an image generator for generating image bearing chromatic light for injection into a waveguide assembly at a first range of field angles with respect to the waveguide assembly and a second range of field angles with respect to the waveguide assembly; the waveguide assembly comprising:
a first waveguide having a first input diffraction region arranged to couple the image bearing chromatic light in the first range of field angles into the first waveguide to propagate by total internal reflection; anda second waveguide having a second input diffraction region arranged to couple the image bearing chromatic light in the second range of field angles into the second waveguide to propagate by total internal reflection;wherein the first and second waveguides have first and second output diffraction regions arranged to output the propagated image bearing chromatic light from the respective waveguides for projection from the waveguide assembly as a colour image in the first and second ranges of field angles, the projected colour image being overlaid on a real world scene viewed through the waveguide assembly; andwherein the image bearing chromatic light has at least one first wavelength and at least one second wavelength different than the at least one first wavelength, the at least one first wavelength being coupled into and projected from the waveguide assembly across at least a portion of the first and second ranges of field angles, the at least one second wavelength of the light being coupled into and projected from the waveguide assembly across a range of field angles smaller than the projected range of field angles of the at least one first wavelength of the light, wherein a difference between the projected range of field angles of the at least one first wavelength of light and the projected range of field angles of the at least one second wavelength of light corresponds to a range of peripheral vision of a human viewer, and wherein the projected range of field angles of the at least one second wavelength of light corresponds to an annular range of full colour perception of the human viewer.