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    OPTICAL FILM AND OPTICAL SYSTEM
    11.
    发明申请
    OPTICAL FILM AND OPTICAL SYSTEM 有权

    公开(公告)号：US20210286113A1

    公开(公告)日：2021-09-16

    申请号：US16500517

    申请日：2018-05-22

    申请人： 3M INNOVATIVE PROPERTIES COMPANY

    发明人： Zhaohui Yang ,  Brett J. Sitter ,  James A. Thielen ,  Nathaniel K. Naismith

    IPC分类号： G02B5/18

    摘要： A multilayer optical film including a first layer having an index of refraction n1 at a wavelength λ in a range from about 580 nm to about 650 nm, and a second layer having an index of refraction n2 at λ is described. The first and second layers define an interface therebetween comprising a two-dimensional grating. The grating may have an average height H such that |n1−n2|*H is in a range from 0.24 micrometers to 0.3 micrometers. Optical systems including the multilayer optical film are described. A subpixel in a display surface of the optical system may be diffracted into a zero diffraction order and a plurality of first diffraction orders where the intensities of the zero and first diffraction orders are with 10% of each other at λ. The optical system may have a modulation transfer function greater than 0.4 at 10 line pairs per millimeter.

    Backlight for an Image Forming Device Comprising an Optical Cavity Formed by Opposing Cold and Hot Mirrors
    14.
    发明申请
    Backlight for an Image Forming Device Comprising an Optical Cavity Formed by Opposing Cold and Hot Mirrors 有权

    公开(公告)号：US20230019291A1

    公开(公告)日：2023-01-19

    申请号：US17952588

    申请日：2022-09-26

    申请人： 3M INNOVATIVE PROPERTIES COMPANY

    发明人： Quinn D. Sanford ,  Matthew B. Johnson ,  Ryan T. Fabick ,  Nathaniel K. Naismith

    IPC分类号： G02F1/1335 ,  G02F1/13357

    摘要： A backlight for an image forming device includes spaced-apart front and back optical reflectors defining an optical cavity therebetween, and at least one light source for emitting light into the optical cavity. The front optical reflector may be disposed between the image forming device and the back optical reflector. For substantially normally incident light and for nonoverlapping first and second wavelength ranges, the front optical reflector may transmit at least 70% of light for each wavelength in the first wavelength range, and may reflect at least 70% of light for each wavelength in the second wavelength range. The back optical reflector may reflect at least 70% of light for each wavelength in the first wavelength range, and may transmit at least 70% of light for each wavelength in the second wavelength range. The emitted light may have at least one wavelength in the first wavelength range and at least one wavelength in the second wavelength range.

    OPTICAL SYSTEM AND HEADS UP DISPLAY SYSTEMS
    20.
    发明申请
    OPTICAL SYSTEM AND HEADS UP DISPLAY SYSTEMS 有权

    公开(公告)号：US20230017066A1

    公开(公告)日：2023-01-19

    申请号：US17781863

    申请日：2020-11-30

    申请人： 3M INNOVATIVE PROPERTIES COMPANY

    发明人： Stephan J. Pankratz ,  Nathaniel K. Naismith

    IPC分类号： G02B5/30 ,  G02B27/01 ,  G02F1/13363 ,  B60K35/00

    摘要： An optical system includes a display system including a display having first and second display pixels interspersed with each other across the display. The first and second display pixels emit superimposed different respective first and second images polarized along the first direction. The display system includes a patterned retarder having pluralities of first and second retarder pixels aligned and registered with the respective first and second display pixels in one-to-one correspondence. The first retarder pixels are configured to receive and transmit the first emitted image as the first output image polarized along the first direction. The second retarder pixels are configured to receive, change the polarization direction, and transmit the second emitted image as the second output image polarized along the second direction. A reflective polarizer is configured to receive the first and second output images and substantially transmit the first output image and substantially reflect the second output image.