Curved-edge display covers and methods of making the same
A display cover can include a rectangular body having opposing outer and inner surfaces and an edge that connects the outer and inner surfaces. A central region, widthwise edge regions, and lengthwise edge regions can each define a portion of the outer and inner surfaces, and the edge regions each can extend from the central region to define a portion of the edge. The central region can be planar such that a plane lies between the outer and inner surfaces throughout the central region. Each of the widthwise edge regions can curve away from the central region such that a line that is tangent to the outer surface at the edge region is substantially perpendicular to the plane of the central region. The body's average thickness can be less than or equal to 0.5 mm, and the body can comprise at least a majority, by weight, of a polymeric material.
1. A method comprising:
heating one or more mold portions of a mold, the mold portions being movable relative to one another between:
an open position; and
first and second closed positions, in each of which the mold portions define a mold cavity, wherein the depth of the mold cavity is smaller in the second closed position than in the first closed position;
after heating one or more of the mold portions, injecting a polymeric material into the mold cavity when the mold portions are in the first closed position; and
moving the mold portions to the second closed position to produce a display cover from the polymeric material, the display cover having:
an outer surface and an opposing inner surface;
an edge that connects the outer and inner surfaces;
a central region that defines a portion of each of the outer and inner surfaces, the central region being planar such that a plane lies between the outer and inner surfaces throughout the central region;
lengthwise edge regions and widthwise edge regions, each of the edge regions:
defining a portion of each of the outer and inner surfaces; and
extending from the central region to define a portion of the edge;
wherein each of the widthwise edge regions curves away from the central region such that a line that is tangent to the outer surface at the edge region is substantially perpendicular to the plane of the central region; and
an average thickness, measured between the outer and inner surfaces, that is less than or equal to 0.5 mm.
2. The method of claim 1 , wherein heating one or more of the mold portions is performed such that a surface of at least one of the mold portions that defines a portion of the mold cavity reaches a temperature that is greater than 200° C.
3. The method of claim 2 , wherein heating one or more of the mold portions comprises inductively heating one or more of the mold portions.
4. The method of claim 1 , wherein each of the widthwise edge regions curves away from the central region such that a line that is tangent to the outer surface at the edge region is within 5 degrees, optionally within 2 degrees, of perpendicular to the plane of the central region.
5. The method of claim 1 , wherein at least one of the lengthwise edge regions curves away from the central region such that a line that is tangent to the outer surface at the edge region is substantially perpendicular to the plane of the central region.
6. The method of claim 1 , wherein, for each of the widthwise edge regions, the inner surface at the edge region has a radius of curvature that is less than or equal to 2 mm.
7. The method of claim 1 , wherein the central region has:
a length that is at least 10 cm; and
a width that is at least 5 cm.
8. The method of claim 1 , wherein the polymeric material is injected through a portion of the mold cavity that forms one of the lengthwise edge regions.
9. The method of claim 1 , wherein the polymeric material comprises polycarbonate, acrylic, a cellulose-based material, and/or a thermoplastic elastomer.
10. The method of claim 9 , wherein the polymeric material comprises a recycled polymeric material.
11. The method of claim 1 , comprising coupling an electronic display to the display cover such that the electronic display is disposed along the inner surface at at least the central and widthwise edge regions.