3m Innovative Properties Company

Fuguo Xu

Yi Hang Lv

John Allen Wheatley

Timothy J Nevitt

Adam D Haag

Neeraj Sharma

Guanglei Du

Martin E Denker

Anthony M Renstrom

Matthew B Johnson

Brianna N Nieson

A system may include one or both of a light emitter and a light receiver, and an optical filter. The optical filter includes a wavelength selective scattering layer. The wavelength selective scattering layer may have a near-infrared scattering ratio of less than about 0.9. The filter may have a visible reflective haze ratio of greater than about 0.5. A method may include disposing the wavelength selective scattering layer adjacent one or both of the light emitter and the light receiver. The optical filter may include a wavelength selective reflective layer. The optical filter may include a wavelength selective absorbing layer. An article may include the optical filter. The wavelength selective scattering layer may have an average near-infrared scattering of less than 60%, an average visible scattering of greater than 10%, and a difference between the % total visible reflectance and the % diffuse visible reflectance of less than 20.

Optical camouflage filters

An optical system includes a multilayer optical film configured to block transmission of visible light but allow peaks or bands of certain visible wavelengths to pass through; an object disposed on a first side of the multilayer optical film; and a light source and a light sensor disposed on an opposite second side of, and facing, the multilayer optical film. The object is configured to receive light emitted by the light source through the multilayer optical film. The light sensor is configured to receive light from the multilayer optical film. An optical filter may include the multilayer optical film disposed on a wavelength selective scattering layer and/or on a wavelength selective absorbing layer. The wavelength selective scattering layer may have a near-infrared scattering ratio of less than about 0.9.

Optical systems and optical filters

An optical system () includes an emissive display () and a reflective polarizer () disposed on the display (). The display () includes a blue pixel () emitting light having a peak at a wavelength λ. For substantially normally incident light: for the wavelength λ, the reflective polarizer () reflects at least 30% of the incident light having a first polarization state (b) and transmits at least 75% of the incident light having an orthogonal second polarization state(a); and for at least one wavelength λgreater than λ, λ-λ≤50 nm, the reflective polarizer () transmits at least 75% of the incident light for each of the first and second polarization states. For the wavelength λ, the reflective polarizer () has a maximum optical transmittance Tfor light incident at a first incident angle, and an optical transmittance T/2 for light incident at a second incident angle greater than the first incident angle by less than about 50 degrees.

Reflective polarizer and optical system

A display () including a display panel () and a polarizer () disposed to receive a light () output of the display panel () is described. The polarizer () may be a reflective polarizer () or a circular polarizer () incorporating a reflective polarizer (). The display panel () includes a plurality of pixels and each pixel includes a plurality of subpixels. The reflective polarizer () has a first reflection band, wherein at normal incidence, the first reflection band has a long wavelength band edge wavelength between peak emission wavelengths of two subpixels in the plurality of subpixels. The reflective polarizer () may be disposed between an absorbing polarizer () and a retarder () in a circular polarizer (). The reflective polarizer () may have substantially non-overlapping first, second, and third reflection bands.

Polarizer and display including same

A system may include one or both of a light emitter () and a light receiver (), and an optical filter (). The optical filter () includes a wavelength selective scattering layer (). The wavelength selective scattering layer () may have a near-infrared scattering ratio of less than about 0.9. The filter () may have a visible reflective haze ratio of greater than about 0.5. A method may include disposing the wavelength selective scattering layer () adjacent one or both of the light emitter () and the light receiver (). The optical filter () may include a wavelength selective reflective layer (). The optical filter () may include a wavelength selective absorbing layer (). An article may include the optical filter (). The wavelength selective scattering layer () may have an average near-infrared scattering of less than 60%, an average visible scattering of greater than 10%, and a difference between the % total visible reflectance and the % diffuse visible reflectance of less than 20.

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Shanghai, China

Fuguo Xu