Head up display (HUD) using a bent waveguide assembly
First Claim
1. A head up display for providing light from an image source, the head up display for disposition in a vehicle having a glare shield disposed above vehicle instrumentation, the glare shield having a top surface, the head up display comprising:
- a waveguide assembly comprising a first waveguide disposed at an angle with respect to the top surface of the glare shield and a second waveguide disposed at an angle with respect to the first waveguide, the first waveguide having a first diffractive coupler at a first end of the first waveguide and the second waveguide having a second diffractive coupler at a second end of the second waveguide, and the first waveguide being positioned as a combiner and allowing viewing of an outside scene and information from the image source, wherein at least part of the first waveguide is configured to be disposed beneath the top surface of the glare shield, wherein the second waveguide is disposed entirely below the top surface and a first end of the second waveguide provides light to a second end of the first waveguide beneath the top surface of the glare shield, wherein the second waveguide is configured so that the light travels from the second end of the first waveguide to the first end of the second waveguide by total internal reflection, wherein the first waveguide and the second waveguide are not a single waveguide and the first waveguide is tilted with respect to the second waveguide, wherein the second diffractive coupler is provided at a planar main surface of the second waveguide, the planar main surface being approximately parallel to the glare shield.
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Accused Products
Abstract
The head up display provides light from an image source. The head up display includes a waveguide assembly comprising a first waveguide for disposition at an angle with respect to a top surface of a glare shield and a second waveguide disposed at an angle with respect to the first waveguide. The first waveguide has a first diffractive coupler at a first end and a second waveguide has a second diffractive coupler at a second end. The first waveguide is positioned as a combiner and allows viewing of an outside scene and information from the image source. At least part of the first waveguide is disposed beneath the top surface of a glare shield.
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Citations
14 Claims
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1. A head up display for providing light from an image source, the head up display for disposition in a vehicle having a glare shield disposed above vehicle instrumentation, the glare shield having a top surface, the head up display comprising:
a waveguide assembly comprising a first waveguide disposed at an angle with respect to the top surface of the glare shield and a second waveguide disposed at an angle with respect to the first waveguide, the first waveguide having a first diffractive coupler at a first end of the first waveguide and the second waveguide having a second diffractive coupler at a second end of the second waveguide, and the first waveguide being positioned as a combiner and allowing viewing of an outside scene and information from the image source, wherein at least part of the first waveguide is configured to be disposed beneath the top surface of the glare shield, wherein the second waveguide is disposed entirely below the top surface and a first end of the second waveguide provides light to a second end of the first waveguide beneath the top surface of the glare shield, wherein the second waveguide is configured so that the light travels from the second end of the first waveguide to the first end of the second waveguide by total internal reflection, wherein the first waveguide and the second waveguide are not a single waveguide and the first waveguide is tilted with respect to the second waveguide, wherein the second diffractive coupler is provided at a planar main surface of the second waveguide, the planar main surface being approximately parallel to the glare shield. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10)
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11. A cockpit comprising:
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a glare shield for shielding aircraft instrumentation having a top surface; and a head up display comprising; a collimator; and a combiner assembly, wherein the combiner assembly includes a first waveguide positioned to receive light from the collimator, wherein the combiner assembly includes a second waveguide disposed as a combiner, the second waveguide being disposed at an angle with respect to the first waveguide, the second waveguide being disposed at least partially above a top surface of the glare shield, the first waveguide having a first waveguide end disposed next to a second waveguide end of the second waveguide beneath the top surface of the glare shield, the first waveguide and the collimator being entirely disposed beneath the top surface of the glare shield, wherein the collimator is entirely disposed beneath a main planar surface of the first waveguide, wherein the main planar surface includes an input coupler configured to receive light from the collimator and the main planar surface is disposed approximately parallel to the top surface of the glare shield. - View Dependent Claims (12, 13, 14)
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Specification