Privacy filter for a display device
First Claim
Patent Images
1. A filter for a display unit, comprising:
- at least first and second parallel spaced-apart planar grids each thereof having a grid plane;
said first and second grids including respectively first and second pluralities of parallel spaced-apart generally flat opaque strips having transparent spaces therebetween;
each of said strips in each of said grids having first and second opposite surfaces, generally in the plane of the grid;
said first and second pluralities of strips aligned in the same direction, with said first surfaces of said strips in said first plurality of strips in a face-to-face relationship with said first surfaces of strips in said second plurality of strips, such that, when the filter is placed in front of the display with said first grid closest a user of the display and viewed by the user at a first angle of incidence, said second grid is not visible to the user and the display is visible to the user through said spaces in said first and second grids; and
said first and second pluralities of strips sized, spaced, and arranged such that when viewed by an observer at a second angle of incidence, said strips in said second grid appear to close said spaces between said strips in said second grid, whereby the display is not visible to the observer.
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Accused Products
Abstract
A privacy filter (20) for a display device includes at least two spaced-apart, generally parallel grids (22 and 24). Each grid includes an array of strips (26 and 30) or blocking members having transparent space (28 and 32) therebetween. The strips or blocking members are formed aligned such that an image (37) displayed on the display device may be viewed through the filter at an angle of incidence within a predetermined range of angles but is not discernable at angles outside of the predetermined range.
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Citations
14 Claims
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1. A filter for a display unit, comprising:
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at least first and second parallel spaced-apart planar grids each thereof having a grid plane; said first and second grids including respectively first and second pluralities of parallel spaced-apart generally flat opaque strips having transparent spaces therebetween; each of said strips in each of said grids having first and second opposite surfaces, generally in the plane of the grid; said first and second pluralities of strips aligned in the same direction, with said first surfaces of said strips in said first plurality of strips in a face-to-face relationship with said first surfaces of strips in said second plurality of strips, such that, when the filter is placed in front of the display with said first grid closest a user of the display and viewed by the user at a first angle of incidence, said second grid is not visible to the user and the display is visible to the user through said spaces in said first and second grids; and said first and second pluralities of strips sized, spaced, and arranged such that when viewed by an observer at a second angle of incidence, said strips in said second grid appear to close said spaces between said strips in said second grid, whereby the display is not visible to the observer. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A filter for a display unit, comprising:
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at least first and second parallel grids each thereof having a grid plane, said first grid formed on a first surface of a first substrate and said second grid formed on a first surface of a second transparent substrate and each of said first and second substrates having an antireflection treatment on a second surface thereof; said first and second grids including respectively first and second pluralities of generally flat parallel spaced-apart opaque strips having transparent spaces therebetween, each of said strips arranged parallel a corresponding one of said grid planes; each of said strips including a metal layer and having first and second opposite surfaces, said second surface adjacent a said substrate, and each of said strips and each of said spaces having a width between about fifty and one-hundred-fifty micrometers; said first surface of each of said strips in said second grid being highly reflective for visible light, said first surface of each of said strips in said first grid and said second surface of each of said strips in said first and second grids having a low reflectivity for visible light; said substrates having said first surfaces thereof in a face-to-face relationship and spaced-apart by and in optical contact with a sheet of a transparent material having a width between about fifty and one-hundred-fifty micrometers; and said first and second pluralities of strips aligned in the same direction with corresponding strips in each of said grids in a face-to-face relationship and said strip widths selected such that when the filter is placed in front of the display with the first grid closest a user of the display and viewed by the user at a first angle of incidence, said second grid is not visible to the user and the display is visible to the user through said spaces in said first and second grids; and said first and second pluralities of strips sized, spaced, and arranged such that when viewed by an observer at a second angle of incidence, said strips in said second grid appear to close said spaces between said strips in said second grid, whereby the display is not visible to the observer. - View Dependent Claims (12, 13, 14)
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Specification