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    Backlight for an Image Forming Device Comprising an Optical Cavity Formed by Opposing Cold and Hot Mirrors
    31.
    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：US20220082889A1

    公开(公告)日：2022-03-17

    申请号：US17419901

    申请日：2020-01-06

    Applicant: 3M INNOVATIVE PROPERTIES COMPANY

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

    IPC: G02F1/1335 ,  G02F1/13357

    Abstract: A backlight (100) for an image forming device (70) includes spaced-apart front and back optical reflectors (20, 10) defining an optical cavity (18) therebetween, and at least one light source (15) for emitting light into the optical cavity. The front optical reflector (20) is disposed between the image forming device and the back optical reflector (10). For substantially normally incident light and for non-overlapping first (e.g. visible light) and second (e.g. infrared) wavelength ranges, the front optical reflector (20) may transmit (80c) at least 70% of light (80a) for each wavelength in the first wavelength range, and may reflect (90b) at least 70% of light (90a) for each wavelength in the second wavelength range. The back optical reflector (10) may reflect (80b) at least 70% of light for each wavelength in the first wavelength range, and may transmit (90c) at least 70% of light (90b) for each wavelength in the second wavelength range. The light (80a, 90a) emitted by the at least one light source (15) has at least one wavelength in the first wavelength range and at least one wavelength in the second wavelength range.

    Optical Films for Display Systems
    38.
    发明申请
    Optical Films for Display Systems 有权

    公开(公告)号：US20250138231A1

    公开(公告)日：2025-05-01

    申请号：US18836889

    申请日：2023-01-31

    Applicant: 3M INNOVATIVE PROPERTIES COMPANY

    Inventor： Matthew B. Johnson ,  Bharat R. Acharya

    IPC: G02B5/28

    Abstract: A display system includes a light source emitting blue light including blue wavelength, and UV light including UV wavelength. A first multilayer optical film (MOF) is disposed between a display panel and a second MOF. Light conversion films receive and convert emitted blue light to green and red lights. At incident angles of less than 10 degrees, the first MOF transmits greater than 50% of light for the blue wavelength and reflects greater than 60% for green and red peak wavelengths. The second MOF transmits greater than 50% for blue, green and red peak wavelengths, and reflects greater than about 60% for the UV wavelength. At oblique incident angles, the first MOF reflects greater than 50% for the blue, green and red peak wavelengths, and the second MOF transmits greater than 50% for the blue, green and red peak wavelengths, and transmits greater than 60% for the UV wavelength.

    Display optical film and backlight unit
    40.
    发明授权
    Display optical film and backlight unit 有权

    公开(公告)号：US12210241B2

    公开(公告)日：2025-01-28

    申请号：US18381412

    申请日：2023-10-18

    Applicant: 3M INNOVATIVE PROPERTIES COMPANY

    Inventor： Gilles J. Benoit ,  Carl A. Stover ,  Matthew B. Johnson ,  Ryan T. Fabick ,  Quinn D. Sanford

    IPC: G02F1/1335 ,  G02F1/13357

    Abstract: An optical stack for reflecting and transmitting light in a predetermined wavelength range includes stacked first and second optical films, the predetermined wavelength range defining a first wavelength range and a remaining wavelength range. For normally incident light and for each wavelength in a first wavelength range, the first optical film substantially reflects light having a first polarization state, and substantially transmits light having a second polarization state. For each of the first and second polarization states, for wavelengths in the first wavelength range, the second optical film has a maximum optical transmittance Tmax for light incident at a first incident angle, and an optical transmittance Tmax/2 for light incident at a second incident angle, where the second incident angle is greater than the first incident angle by less than about 50 degrees. For wavelengths in the remaining wavelength range, the second optical film reflects at least 80% of light.

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