Head-up display with narrow band reflective polarizer
First Claim
1. A system for displaying information to a viewing position, comprising:
- a window member having a target area and at least a first exposed window surface at the target area, the first exposed window surface having associated therewith a first normal axis;
a display source that emits polarized light toward the target area along an illumination axis that makes an acute angle θ
1 with respect to the first normal axis, the emitted light being substantially p-polarized and including a selected visible wavelength of interest; and
a reflective polarizer disposed proximate the target area to reflect at least some of the p-polarized light from the display source towards the viewing position;
wherein the reflective polarizer reflects the p-polarized light in a narrow reflection band that includes the selected visible wavelength of interest over an angular range of incidence angles that includes the angle θ
1.
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Accused Products
Abstract
A head-up display includes a projection system and a window having a target area where a reflective polarizer is positioned to reflect light from the projection system to a viewing area. Light from the projection system is p-polarized and strikes exposed window surface(s) at an acute angle to reduce or eliminate multiple or “ghost” images. The acute angle is closely matched to a Brewster angle of the exposed window surface(s). The reflective polarizer includes a multilayer stack with refractive indices of individual layers chosen to reflect p-polarized light substantially more than s-polarized light over a wide angular range that includes the acute angle. The reflective polarizer also can reflect infrared light to reduce cabin heating from solar radiation.
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Citations
14 Claims
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1. A system for displaying information to a viewing position, comprising:
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a window member having a target area and at least a first exposed window surface at the target area, the first exposed window surface having associated therewith a first normal axis;
a display source that emits polarized light toward the target area along an illumination axis that makes an acute angle θ
1 with respect to the first normal axis, the emitted light being substantially p-polarized and including a selected visible wavelength of interest; and
a reflective polarizer disposed proximate the target area to reflect at least some of the p-polarized light from the display source towards the viewing position;
wherein the reflective polarizer reflects the p-polarized light in a narrow reflection band that includes the selected visible wavelength of interest over an angular range of incidence angles that includes the angle θ
1. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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Specification