Head mounted projection display with multilayer beam splitter and color correction
AssigneeTilt Five, Inc
InventorsWei RONG, Evan COONS, Jeri J. ELLSWORTH, Ken CLEMENTS
Life of this patent
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Abstract
A head mounted projection display includes a polarizing beam splitter stack that includes a waveplate. The polarizing beam splitter stack reduces optical losses and has a low forward extension. The polarizing beam splitter may be used at a 45 degree angle or at a non 45 degree angle relative to the line of view. A correction may be also be performed to the intensity of individual pixels to account for chromatic non-uniformity in the optical response of a retroreflector and other optical components.
Claims25
A head-mounted projection display, comprising:
- an image source having a circular polarization;
- a polarizing beam splitter to direct output images to a retroreflective screen and transmit returning reflected retroreflective images for viewing by a user;
- an optically retarding film formed on at least one surface of the polarizing beam splitter to adjust the polarization of the output images to achieve a maximum reflection of outgoing images reflected to the retroreflective screen and further achieve a maximum transmission of received retroreflected images.
A head-mounted projection display with low forward extension, comprising:
- a glasses frame;
- an image source mounted to the glasses frame and having a circular polarization;
- a polarizing beam splitter mounted to the glasses frame to direct output images to a retroreflective screen and transmit returning reflected retroreflective images for viewing by a user;
- an optically retarding film formed on at least one surface of the polarizing beam splitter to adjust the polarization of the output images to achieve a maximum reflection of outgoing images reflected to the retroreflective screen and further achieve a maximum transmission of received retroreflected images;
- and
- wherein a forward extension of the glasses frame in a brow region is less than one centimeter.
A method of operating a head mounted projection display, comprising:
- utilizing a polarizing beam splitter with an integrated optical retarding film to direct projected light to a retroreflective screen and transmit returned images;
- and
- performing a brightness correction of the intensities of pixels of images that are projected to a retroreflective screen by adjusting the intensities of the primary colors of the projected pixels based at least in part on a calculation of the incidence angle of each pixel to at least partially compensate for image distortion due to imperfect headset optics or imperfect retroreflection.
Dependencies are inferred from the claim text.