US 12,298,505 B2
Optical systems having angle-selective transmission filters
Vikrant Bhakta, Santa Clara, CA (US); Byron R. Cocilovo, Sunnyvale, CA (US); Guolin Peng, Sunnyvale, CA (US); Hyungryul Choi, San Jose, CA (US); Scott M. DeLapp, San Diego, CA (US); and Se Baek Oh, Millbrae, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Jan. 28, 2021, as Appl. No. 17/161,469.
Claims priority of provisional application 62/970,800, filed on Feb. 6, 2020.
Prior Publication US 2021/0247610 A1, Aug. 12, 2021
Int. Cl. G02B 27/01 (2006.01); F21V 8/00 (2006.01); G02B 5/18 (2006.01); G02B 5/20 (2006.01); G02B 5/22 (2006.01); G02B 5/26 (2006.01); G02B 5/32 (2006.01)
CPC G02B 27/0172 (2013.01) [G02B 5/1814 (2013.01); G02B 5/203 (2013.01); G02B 5/22 (2013.01); G02B 5/26 (2013.01); G02B 5/32 (2013.01); G02B 6/0016 (2013.01); G02B 6/0023 (2013.01); G02B 6/0026 (2013.01); G02B 6/0035 (2013.01); G02B 2027/012 (2013.01); G02B 2027/0174 (2013.01)] 24 Claims
OG exemplary drawing
 
1. A display system comprising:
a first emissive display panel having pixels configured to emit light within a first wavelength range that propagates along an optical path extending from the first emissive display panel to an eye box, wherein the first wavelength range comprises a red wavelength range;
a second emissive display panel configured to emit light within a second wavelength range that is different from the first wavelength range, wherein the second wavelength range comprises a green wavelength range;
a third emissive display panel configured to emit light within a third wavelength range that is different from the first and second wavelength ranges, wherein the third wavelength range comprises a blue wavelength range;
a first angle-selective transmission filter interposed on the optical path and configured to filter the light emitted by the pixels as a function of angle to produce filtered light;
a waveguide interposed on the optical path, wherein the first angle-selective transmission filter is configured to remove at least a portion of the light from the optical path before the filtered light is provided to the waveguide;
an input coupler on the waveguide and configured to couple the filtered light into the waveguide;
an output coupler on the waveguide and configured to couple the filtered light out of the waveguide and towards an eye box;
imaging optics between the first emissive display panel and the input coupler;
a prism between the imaging optics and the first emissive display panel, wherein the first angle-selective transmission filter is between the first emissive display panel and the prism, the first angle-selective transmission filter is configured to transmit the filtered light towards the prism, the prism is configured to transmit the filtered light towards the imaging optics, and the imaging optics is configured to transmit the filtered light towards the input coupler;
a second angle-selective transmission filter between the second emissive display panel and the prism, wherein the second angle-selective transmission filter is configured to filter the light emitted by the second emissive display panel as a function of angle to produce second filtered light and is configured to transmit the second filtered light to the prism; and
a third angle-selective transmission filter between the third emissive display panel and the prism, wherein the third angle-selective transmission filter is configured to filter the light emitted by the third emissive display panel as a function of angle to produce third filtered light and is configured to transmit the third filtered light to the prism.