Multiple-polarization cloaking for projected and writing surface view screens
AssigneeSteelcase Inc.
InventorAndrew Graham
Life of this patent
Estimating the term…
Abstract
A system includes a view screen with polarized output. The view screen may include a projected view screen or writing-surface view screen. A window capable of blocking the polarized output at least in part cloaks the view screen to frustrate viewing of the view screen through the window. In some cases, the window includes an array of panels capable of blocking multiple polarizations. The array may disrupt multiple different polarized view screen outputs while maintaining transparency to unpolarized light. In some cases, the window capable of blocking polarized output may be paired with view screen cover that converts view screen output in an unblocked polarization to one of the one or more polarizations blocked by the window.
Claims20
A method of manufacture including:
- designating a set of one or more cloaking markers;
- providing a writing-surface view screen including:
- a backlight;
- a view screen polarizer layer oriented to polarize output of the backlight in view-screen-output polarization;
- and
- a markable front surface formed by a view-screen-mountable waveplate oriented to convert the view-screen-output polarization to a specific polarization, where, when the writing-surface view screen is placed within a line-of-sight of a polarizer window through the view-screen-mountable waveplate, the polarizer window filters the specific polarization to obscure cloaking markings, from a cloaking marker in the set of one or more cloaking markers, on the markable front surface.
A system including:
- a writing-surface view screen;
- and
- a polarizer window,
- the writing-surface view screen including:
- a backlight;
- a view screen polarizer layer oriented to polarize output of the backlight in view- screen-output polarization;
- and
- a markable front surface formed by a view-screen-mountable waveplate oriented to convert the view-screen-output polarization to a specific polarization;
- a designation specifying a set of one or more cloaking markers;
- and
- the polarizer window configured to filter the specific polarization to obscure cloaking markings, from a cloaking marker in the set of one or more cloaking markers, on the markable front surface when within a line-of-sight of the markable front surface.
A system including:
- a writing-surface view screen including:
- a backlight;
- a polarizer layer oriented to polarize output of the backlight in a first polarization;
- and
- a markable front surface;
- a designation specifying a set of one or more cloaking markers;
- first regions placed to render unintelligible a cloaking marking, from a cloaking marker in the set of one or more cloaking markers, when displayed on the markable front surface, the first regions obstructive to the first polarization and transmissive to a second polarization different than the first polarization;
- and
- second regions interlaced with the first regions, the second regions placed to render unintelligible view screen output in the second polarization.
Dependencies are inferred from the claim text.