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US 11,016,336 B2Granted
Bragg grating-based display filtering
AssigneeMicrosoft Technology Licensing, LLC
InventorTimothy Large
Life of this patent
Estimating the term…
Abstract
A display includes a display modulation layer, a backlight unit configured to generate light for illumination of the display modulation layer, and a filter film disposed between the backlight unit and the display modulation layer. The filter film includes a plurality of Bragg grating sets. Each Bragg grating set is configured to reflect the light in a wavelength-selective and angular-selective manner rearward toward the backlight unit.
Claims20
A display comprising:
- a display modulation layer;
- a backlight unit configured to generate light for illumination of the display modulation layer;
- a filter disposed between the backlight unit and the display modulation layer wherein the filter passes a first portion of the light from the backlight unit including light rays that are off-axis from a surface normal of the filter;
- and
- a diffuser layer disposed between the filter and the display modulation layer, the diffuser layer being switchable between a transmissive mode and a diffusive mode, wherein the diffuser layer is in the diffusive mode based at least in part on the application of power, and in the transmissive mode based at least in part on power not being applied thereto, and wherein the transmissive mode does not substantially alter a path of the first portion of the light from the backlight unit irrespective of angle of the path of the first portion of the light relative to the diffuser layer passed by the filter to the diffuser layer;
- wherein the filter comprises a plurality of Bragg grating sets, and
- wherein each Bragg grating set is configured to reflect a second portion of the light in a wavelength-selective and angular-selective manner rearward toward the backlight unit.
4 more elements
A display comprising:
- a liquid crystal display (LCD) layer;
- a backlight unit configured to generate light for illumination of the LCD layer
- a photonic lattice filter film disposed between the backlight unit and the LCD layer wherein the filter passes a first portion of the light from the backlight unit including light rays that are off-axis from a surface normal of the filter;
- and
- a diffuser layer disposed between the photonic lattice filter film and the LCD layer, the diffuser layer being switchable between a transmissive mode and a diffusive mode, wherein the diffuser layer is in the diffusive mode based at least in part on the application of power, and in the transmissive mode based at least in part on power not being applied thereto, and wherein the transmissive mode does not substantially alter a path of the first portion of the light from the backlight unit irrespective of angle of the path of the first portion of the light relative to the diffuser layer passed by the filter to the diffuser layer;
- wherein the photonic lattice filter film comprises a plurality of Bragg grating sets, and
- wherein each Bragg grating set is configured to reflect a bandwidth of the second portion of the light rearward toward the backlight unit when propagating at off-axis angles beyond a predetermined range of viewing angles for the display.
4 more elements
A display comprising:
- a display modulation layer;
- a backlight unit configured to generate light for illumination of the display modulation layer;
- a filter film disposed between the backlight unit and the display modulation layer wherein the filter passes a first portion of the light from the backlight unit including light rays that are off-axis from a surface normal of the filter;
- and
- a switchable diffuser layer disposed between the filter film and the display modulation layer, the diffuser layer being switchable between a transmissive privacy mode and a diffusive mode, the transmissive privacy mode having a viewing angle of less than about 30°, wherein the diffuser layer is in the diffusive mode based at least in part on the application of power, and in the transmissive mode based at least in part on power not being applied thereto, and wherein the transmissive mode does not substantially alter a path of the first portion of the light from the backlight unit irrespective of angle of the path of the first portion of the light relative to the diffuser layer passed by the filter to the diffuser layer and the light generated by the backlight unit is not visible outside of the viewing angle;
- wherein the filter film comprises a plurality of Bragg grating sets, and
- wherein each Bragg grating set is configured to reflect a bandwidth of a second portion of the light rearward toward the backlight unit when propagating at off-axis angles beyond a predetermined range of viewing angles for the display.
4 more elements
Dependencies are inferred from the claim text.