Head up display with an angled light pipe
First Claim
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1. A head up display, comprising:
- a light pipe configured to expand a pupil in a first direction, the light pipe comprising four elongated surfaces comprising at least two elongated surfaces that are parallel to each other, wherein the light pipe is configured so that light travels through the light pipe in a fashion where the four elongated surfaces are struck by the light as the light travels from a first end to a second end in the first direction; and
a waveguide combiner in optical communication with the light pipe and comprising a main surface disposed at an angle with respect to the two elongated surfaces that are parallel to each other, the waveguide combiner being configured to expand the pupil in a second direction along the main surface.
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Abstract
A head up display includes a light pipe and a waveguide combiner. The light pipe is configured to expand a pupil in a first direction and includes an input grating and an output put grating. The light pipe also includes four elongated surfaces, and the input grating and the output grating are provided in one or more planes parallel to two of the elongated surfaces. The waveguide combiner is configured to expand the pupil in a second direction perpendicular to the first direction. The first light pipe is disposed at an angle with respect to a waveguide combiner.
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Citations
20 Claims
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1. A head up display, comprising:
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a light pipe configured to expand a pupil in a first direction, the light pipe comprising four elongated surfaces comprising at least two elongated surfaces that are parallel to each other, wherein the light pipe is configured so that light travels through the light pipe in a fashion where the four elongated surfaces are struck by the light as the light travels from a first end to a second end in the first direction; and a waveguide combiner in optical communication with the light pipe and comprising a main surface disposed at an angle with respect to the two elongated surfaces that are parallel to each other, the waveguide combiner being configured to expand the pupil in a second direction along the main surface. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method of providing information to a user, the method comprising:
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providing light from a projector; providing the light from the projector to a light pipe, wherein the light travels through the light pipe in a fashion where four elongated surfaces elongated surfaces of the light pipe are struck by the light as the light travels from a first end to a second end in a first direction; and providing the light from the light pipe to a waveguide combiner having a main surface, wherein at least one of the elongated surfaces is disposed at an angle and spaced apart from the main surface of the waveguide combiner, wherein the light travels through the waveguide combiner in a second direction. - View Dependent Claims (11, 12, 13)
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14. A head up display system, comprising:
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at least one light pipe having four elongated surfaces, wherein a first pair of the elongated surfaces are parallel to each other and a second pair of the elongated surfaces are perpendicular to the first pair of the elongated surfaces, wherein light travels through the light pipe in a fashion where the four elongated surfaces are struck by the light as the light travels from a first end to a second end in a first direction; and a waveguide combiner having a main surface for viewing an image and an input grating, the waveguide combiner being disposed such that the first pair of the elongated surfaces are spaced apart from and disposed at an angle with respect to the main surface of the waveguide combiner, wherein the at least one light pipe is configured to expand a pupil in the first direction and provide the light to the input grating of the waveguide combiner, the waveguide combiner being configured to expand the pupil in a second direction on the main surface. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification