US 12,087,190 B2
System for calibrating waveguide-based holographic head-up display
Kai-Han Chang, Sterling Heights, MI (US); Thomas A. Seder, Fraser, MI (US); and Manoj Sharma, Troy, MI (US)
Assigned to GM GLOBAL TEACHNOLOGY OPERATIONS LLC, Detroit, MI (US)
Filed by GM Global Technology Operations LLC, Detroit, MI (US)
Filed on Jul. 25, 2022, as Appl. No. 17/814,661.
Prior Publication US 2024/0029599 A1, Jan. 25, 2024
Int. Cl. G09G 3/00 (2006.01); B60K 35/00 (2024.01); G02B 5/02 (2006.01); G02B 27/01 (2006.01); G02B 27/36 (2006.01); G06T 5/00 (2024.01); G06T 5/80 (2024.01); B60K 35/23 (2024.01); B60K 35/81 (2024.01)
CPC G09G 3/002 (2013.01) [B60K 35/00 (2013.01); G02B 5/0284 (2013.01); G02B 27/0103 (2013.01); G02B 27/36 (2013.01); G06T 5/80 (2024.01); B60K 35/23 (2024.01); B60K 35/81 (2024.01); B60K 2360/21 (2024.01); B60K 2360/29 (2024.01); G02B 2027/011 (2013.01); G02B 2027/0138 (2013.01); G09G 2320/0693 (2013.01); G09G 2380/10 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A system for calibrating a waveguide-based holographic head-up display that projects images upon a windscreen of a vehicle, the system comprising:
a light-diffusing panel positioned at the center of an eyellipse to reflect the images projected by the waveguide-based holographic head-up display, wherein an eyebox of the waveguide-based holographic head-up display is positioned at the center of the eyellipse, and wherein the eyebox is divided into a plurality of unit exit pupils;
a camera positioned to capture the images reflected by the light-diffusing panel; and
one or more controllers in electronic communication with the waveguide-based holographic head-up display and the camera, wherein the one or more controllers execute instructions to:
instruct the waveguide-based holographic head-up display to generate a calibration graphic upon the windscreen of the vehicle, wherein the calibration graphic includes a plurality of individual calibration patterns, each of which coincides with one of the plurality of unit exit pupils of the eyebox;
receive image data from the camera, wherein the image data captures the calibration graphic that is reflected upon the light-diffusing panel, and wherein the calibration graphic reflected upon the light-diffusing panel includes a plurality of warped individual calibration patterns;
correct distortions in each of the plurality of warped individual calibration patterns of the calibration graphic to create a plurality of corrected individual calibration patterns; and
determine a warp map based on the plurality of corrected individual calibration patterns.