LIGHT DIRECTING FILTERS
A light directing filter may include one or more glass layers, one or more arrays of barriers within the glass layer, and one or more arrays of openings defined by the array(s) of barriers. An array of barriers may block transmission of light through the glass layer. An array of openings may allow transmission of light through the glass layer. One or more light directing filters may be included in a display system for a vehicle. The light directing filter(s) of the display system may allow a vehicle passenger to view visual information presented on the display system while not allowing a vehicle driver to view the visual information.
1 . A light directing filter comprising:
a glass layer, the glass layer having:
a first layer surface and a second layer surface opposite to the first layer surface; and
a first edge and a second edge opposite to the first edge;
an array of barriers within the glass layer, the array of barriers located between the first layer surface and the second layer surface, the array of barriers blocking transmissions of light, incident on the array of barriers, between the first layer surface and the second layer surface; and
an array of openings defined by the array of barriers, the array of openings allowing transmission of light between the first layer surface and the second layer surface;
wherein:
the array of barriers includes a first set of rows of barriers arrayed between the first edge and the second edge, the first set of rows of barriers including a first portion and individual rows of barriers within the first portion forming different angles with the second layer surface.
2 . The light directing filter of claim 1 , wherein the array of openings includes a first opening and a second opening, the second opening being smaller than the first opening.
3 . The light directing filter of claim 1 , wherein the first set of rows of barriers further includes a second portion and individual rows of barriers within the second portion mirror the individual rows of barriers within the first portion.
4 . The light directing filter of claim 1 , wherein:
the glass layer further has a third edge and a fourth edge opposite to the third edge;
the array of barriers further includes a second set of rows of barriers arrayed between the third edge and the fourth edge, the second set of rows of barriers including a third portion and individual rows of barriers within the third portion forming different angles with the second layer surface.
5 . The light directing filter of claim 4 , wherein at least a first part of the first set of rows of barriers and a second part of the second set of rows of barriers are orthogonal to each other.
6 . The light directing filter of claim 1 , wherein the first opening includes a polygonal opening.
7 . The light directing filter of claim 6 , wherein the polygonal opening includes four sides.
8 . The light directing filter of claim 6 , wherein the polygonal opening includes six sides.
9 . The light directing filter of claim 1 , wherein the array of barriers blocks transmission, between the first layer surface and the second layer surface, of light moving in a direction that is horizontally offset from a normal to the second layer surface by forty-six degrees.
10 . The light directing filter of claim 1 , wherein the array of openings allows transmission, between the first layer surface and the second layer surface, of light moving in a direction that is vertically offset from a normal to the second layer surface by twenty degrees.
11 . A method for making a light directing filter, the method comprising:
providing a glass block for cutting, the glass block having a first block surface and a second block surface opposite to the first block surface, the glass block including:
a first array of barriers located between the first block surface and the second block surface, the first array of barriers blocking transmissions of light, incident on the first array of barriers, between the first block surface and the second block surface;
a first array of openings defined by the first array of barriers, the first array of openings allowing transmission of light between the first block surface and the second block surface;
cutting a curved glass layer from the glass block; and
flattening the curved glass layer.
12 . The method of claim 11 , wherein flattening the curved glass layer includes applying heat to the curved glass layer.
13 . The method of claim 11 , wherein the curved glass layer is cut from the glass block using a cylindrical curvature cut.
14 . The method of claim 11 , wherein the curved glass layer is cut from the glass block using a spherical curvature cut.
15 . The method of claim 11 , wherein the flattened glass layer has a first layer surface and a second layer surface opposite to the first layer surface, and a first edge and a second edge opposite to the first edge, the flattened glass layer including:
a second array of barriers within the flattened glass layer, the second array of barriers located between the first layer surface and the second layer surface, the second array of barriers blocking transmissions of light, incident on the second array of barriers, between the first layer surface and the second layer surface; and
a second array of openings defined by the second array of barriers, the second array of openings allowing transmission of light between the first layer surface and the second layer surface;
wherein the second array of barriers includes a first set of rows of barriers arrayed between the first edge and the second edge, the first set of rows of barriers including a first portion and individual rows of barriers within the first portion forming different angles with the second layer surface.
16 . A vehicle comprising:
a display system for providing visual information to a vehicle passenger while not providing the visual information to a vehicle driver when the vehicle passenger is seated in a front passenger seat and the vehicle driver is seated in a driver seat, the display system comprising:
a display screen emitting light conveying the visual information;
a light directing filter positioned in front of the display screen, the light directing filter comprising:
a glass layer, the glass layer having:
a first layer surface and a second layer surface opposite to the first layer surface; and
a first edge and a second edge opposite to the first edge;
an array of barriers within the glass layer, the array of barriers located between the first layer surface and the second layer surface, the array of barriers blocking transmissions of light, incident on the array of barriers, between the first layer surface and the second layer surface; and
an array of openings defined by the array of barriers, the array of openings allowing transmission of light between the first layer surface and the second layer surface;
wherein the array of barriers includes a first set of rows of barriers arrayed between the first edge and the second edge, the first set of rows of barriers including a first portion and individual rows of barriers within the first portion forming different angles with the second layer surface.
17 . The vehicle of claim 16 , wherein the display system further comprises a protective glass layer, the light directing filter positioned between the display screen and the protective glass layer.
18 . The vehicle of claim 16 , wherein the display system further comprises a protective glass layer, the protective glass layer positioned between the display screen and the light directing filter.
19 . The vehicle of claim 16 , wherein the display system is positioned with respect to the driver seat such that eyes of the vehicle driver seated in the driver seat are located forty-six degrees horizontally to the display system.
20 . The vehicle of claim 16 , wherein the display system is positioned with respect to the front passenger seat such that eyes of the vehicle passenger seated in the front passenger seat are located twenty degrees vertically above the display system.