Head-Up Display

Patent metadata

Field	Value
Publication number	US-2025013198-A1
Application number	US-202418885141-A
Country	US
Kind code	A1
Filing date	Sep 13, 2024
Priority date	Jul 18, 2018
Publication date	Jan 9, 2025
Grant date	—

Abstract

There is provided a head-up display comprising a glare trap; and an eye-box, wherein the head-up display comprises: a picture generating unit; an optical system comprising at least one mirror and a beam splitter, wherein the beam splitter is substantially reflective to infrared light and transmissive to visible light; an infrared image capture device disposed within a volume of the optical system; and a plurality of infrared light sources packaged with the glare trap, wherein the infrared light sources are arranged to illuminate the eye-box.

First claim

What is claimed is:

1 . A head-up display comprising
a glare trap; and an eye-box, wherein the head-up display comprises: a picture generating unit; an optical system comprising at least one mirror and a beam splitter, wherein the beam splitter is substantially reflective to infrared light and transmissive to visible light; an infrared image capture device disposed within a volume of the optical system; and a plurality of infrared light sources packaged with the glare trap, wherein the infrared light sources are arranged to illuminate the eye-box.

2 . The head-up display of claim 1 , wherein the glare trap is transmissive to infrared light, and wherein infrared light reflected off a viewer at the eye-box has an infrared light path through the glare trap and comprises a reflection from the beam splitter to the infrared image capture device.

3 . The head-up display of claim 1 , wherein the glare trap is transmissive to infrared light.

4 . The head-up display of claim 1 , wherein infrared light reflected off a viewer at the eye-box has an infrared light path through the optical system to the infrared image capture device.

5 . The head-up display of claim 4 , wherein the glare trap is in the infrared light path.

6 . The head-up display of claim 4 , wherein the infrared light path comprises a reflection from the beam splitter to the infrared image capture device.

7 . The head-up display of claim 1 , wherein the plurality of infrared light sources are packaged next to the glare trap.

8 . The head-up display of claim 7 , wherein the plurality of infrared light sources ( 716 ) are packaged using a camo film.

9 . The head-up display of claim 8 , wherein the plurality of infrared light sources are packaged on top of the glare trap.

10 . The head-up display of claim 1 , wherein the plurality of infrared light sources is an array of infrared light sources arranged to emit infrared light wherein all the emitted infrared light is directed to the eye-box.

11 . The head-up display of claim 1 , wherein the at least one mirror comprises a freeform mirror arranged to relay light of the picture generated by the picture generating unit to the eye-box.

12 . The head-up display of claim 1 , wherein the beam-splitter is non-disruptive to light of the picture generated by the picture generating unit.

13 . The head-up display of claim 1 , wherein the picture generating unit comprises at least one visible light channel.

14 . The head-up display of claim 13 , wherein each visible light channel comprises:
a visible light source arranged to emit visible light; and a spatial light arranged to receive the visible light from the visible light source and output, in use, spatially modulated light in accordance with a computer-generated hologram displayed on the spatial light modulator to form, in use, a visible light pattern on a replay plane.

15 . The head-up display of claim 14 , wherein each visible light channel further comprises a controller arranged to output, in use, a light-modulation distribution comprising the computer-generated hologram to the spatial light modulator.

16 . The head-up display of claim 14 , wherein the optical system further comprises a cover glass, the infrared image capture device being disposed below the cover glass.

17 . The head-up display of claim 1 , wherein the infrared image capture device and plurality of infrared light sources are part of a driver monitoring system further comprising:
an image processor arranged to receive, in use, captured images of a viewer and provide an input which determines, in use, the light-modulation distribution output by at least one of the controllers and therefore the corresponding light pattern formed on the replay plane.

18 . The head-up display of claim 1 , wherein the head-up display is arranged to direct, during use, the light of the picture to the eye-box using an optical combiner.

19 . A method for head-up display, the method comprising:
providing a glare trap; generating a picture; conducting light of the picture to an eye-box for viewing by a viewer, via transmission through a beam splitter that is substantially reflective to infrared light and transmissive to visible light, and reflection off of a mirror; illuminating the eye-box with a plurality of infrared light sources packaged with the glare trap; and conducting infrared light from the eye-box to an infrared image capture device via an infrared light path comprising a reflection off of the beam splitter.

20 . The head-up display method of claim 19 , wherein the glare trap is transmissive to infrared light, and wherein the infrared light path further comprises transmission through the glare trap.

Assignees

• Envisics Ltd

Inventors

• Christmas Jamieson

Classifications

• G02B2027/0187

  slaved to motion of at least a part of the body of the user, e.g. head, eye · CPC title

• G03H2225/34

  Amplitude and phase coupled modulation · CPC title

• G03H2223/24

  Reflector; Mirror · CPC title

• G03H2222/16

  Infra Red [IR] · CPC title

• G03H2222/12

  Single or narrow bandwidth source, e.g. laser, light emitting diode [LED] · CPC title