US 12,351,024 B2
Display system for vehicle
Adam D. Haag, Woodbury, MN (US); and Stephan J. Pankratz, Eagan, MN (US)
Assigned to 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
Appl. No. 17/923,281
Filed by 3M INNOVATIVE PROPERTIES COMPANY, St. Paul, MN (US)
PCT Filed Apr. 7, 2021, PCT No. PCT/IB2021/052899
§ 371(c)(1), (2) Date Nov. 4, 2022,
PCT Pub. No. WO2021/224697, PCT Pub. Date Nov. 11, 2021.
Claims priority of provisional application 62/704,396, filed on May 8, 2020.
Prior Publication US 2023/0256820 A1, Aug. 17, 2023
Int. Cl. B60K 35/00 (2024.01); B60K 35/23 (2024.01); G02B 27/01 (2006.01)
CPC B60K 35/00 (2013.01) [G02B 27/0101 (2013.01); B60K 35/23 (2024.01); B60K 2360/23 (2024.01); B60K 2360/332 (2024.01)] 10 Claims
OG exemplary drawing
 
1. A display system for displaying a virtual image to a passenger of a vehicle, the display system comprising:
a display panel configured to emit a polarized image light having a first polarization state and substantially distinct blue, green, and red emission spectra having respective blue, green, and red full widths at half maxima (FWHMs);
a reflective polarizer configured to receive and reflect the polarized image light as a first reflected polarized image light, the reflective polarizer comprising a reflection spectrum comprising substantially distinct blue, green, and red reflection bands with respective blue, green, and red FWHMs; and
a mirror configured to receive and reflect the first reflected polarized image light as a second reflected polarized image light toward a windshield of the vehicle, such that for substantially normally incident light:
for the first polarization state, the reflective polarizer reflects at least about 60% of the incident light for at least one wavelength within each of the FWHMs of the blue, green and red reflection bands;
for the first polarization state, the reflective polarizer transmits at least about 50% of the incident light for at least one same first wavelength between the FWHMs of the blue and green reflection bands and between the FWHMs of the blue and green emission spectra, and for at least one same second wavelength between the FWHMs of the green and red reflection bands and between the FWHMs of the green and red emission spectra;
for an orthogonal second polarization state, the reflective polarizer transmits at least about 60% of the incident light for each wavelength in the FWHMs of the blue and red reflection bands and emission spectra and each wavelength therebetween; and
for at least the first polarization state, the mirror reflects at least about 70% of the incident light for each wavelength in the FWHMs of the blue, green and red emission spectra.