Biased total thickness variations in waveguide display substrates
AssigneeMagic Leap, Inc.
InventorsSamarth Bhargava, Christophe Peroz, Victor Kai Liu
Life of this patent
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Abstract
A plurality of waveguide display substrates, each waveguide display substrate having a cylindrical portion having a diameter and a planar surface, a curved portion opposite the planar surface defining a nonlinear change in thickness across the substrate and having a maximum height D with respect to the cylindrical portion, and a wedge portion between the cylindrical portion and the curved portion defining a linear change in thickness across the substrate and having a maximum height W with respect to the cylindrical portion. A target maximum height Dt of the curved portion is 10−7 to 10−6 times the diameter, D is between about 70% and about 130% of Dt, and W is less than about 30% of Dt.
Claims20
A waveguide display substrate comprising:
- a cylindrical portion having a planar surface;
- a curved portion opposite the planar surface, defining a nonlinear change in thickness across the substrate;
- and
- a wedge portion between the cylindrical portion and the curved portion, defining a linear change in thickness across the substrate, wherein a range of a dome height of the curved portion is between 700 nm and 1300 nm, and a maximum height of the wedge portion is less than 300 nm.
A method comprising:
- fabricating a waveguide display substrate such that the substrate comprises:
- a cylindrical portion having a planar surface;
- a curved portion opposite the planar surface and defining a nonlinear change in thickness across the substrate;
- and
- a wedge portion between the cylindrical portion and the curved portion, defining a linear change in thickness across the substrate, wherein a range of a dome height of the curved portion is between 700 nm and 1300 nm, and a maximum height of the wedge portion is less than 300 nm.
Dependencies are inferred from the claim text.