US 11,703,688 B2
Anamorphic optical system and display apparatus including the same
Bongsu Shin, Seoul (KR); Woojun Han, Yongin-si (KR); Jaisoon Kim, Yongin-si (KR); Sunil Kim, Seoul (KR); and Hongseok Lee, Seoul (KR)
Assigned to SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR); and MYONGJI UNIVERSITY INDUSTRY AND ACADEMIA COOPERATION, Yongin-si (KR)
Filed by SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR); and MYONGJI UNIVERSITY INDUSTRY AND ACADEMIA COOPERATION, Yongin-si (KR)
Filed on Sep. 30, 2020, as Appl. No. 17/38,592.
Claims priority of application No. 10-2020-0026124 (KR), filed on Mar. 2, 2020.
Prior Publication US 2021/0271083 A1, Sep. 2, 2021
Int. Cl. G02B 27/01 (2006.01); G02C 7/08 (2006.01)
CPC G02B 27/0172 (2013.01) [G02C 7/083 (2013.01); G02B 2027/011 (2013.01); G02B 2027/0174 (2013.01); G02B 2027/0178 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A display apparatus comprising:
an anamorphic optical system which includes an illumination system configured to transmit image light and having astigmatism, the anamorphic optical system further includes a first correction lens configured to have tangential power and a second correction lens configured to have sagittal power; and
an off-axis optical coupler to which the image light from the anamorphic optical system is transmitted,
wherein a difference between a first distance from the first correction lens to a tangential image formed by the first correction lens and a second distance from the second correction lens to a sagittal image formed by the second correction lens corresponds to a third distance between the first correction lens and the second correction lens,
wherein at least one of the first correction lens and the second correction lens has an asymmetric stop to form the tangential image and the sagittal image directly on an aperture position of a filtering member so as to correct the astigmatism in the illumination system,
wherein the filtering member is provided at an intermediate position in an optical pathway between the optical coupler and the first and second correction lenses, and
wherein a tangential stop position of the first correction lens and a sagittal stop position of the second correction lens are at the aperture position of the filtering member.