US 12,235,453 B2
Display apparatus for providing expanded viewing window
Jong-Young Hong, Suwon-si (KR); Hongseok Lee, Seoul (KR); and Young Kim, Yongin-si (KR)
Assigned to SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR)
Filed by SAMSUNG ELECTRONICS CO., LTD., Suwon-si (KR)
Filed on Sep. 13, 2023, as Appl. No. 18/466,664.
Application 18/466,664 is a division of application No. 17/107,109, filed on Nov. 30, 2020, granted, now 11,789,271.
Claims priority of application No. 10-2020-0066675 (KR), filed on Jun. 2, 2020.
Prior Publication US 2023/0418075 A1, Dec. 28, 2023
Int. Cl. G02B 27/01 (2006.01); F21V 8/00 (2006.01); G02B 5/18 (2006.01); G02B 27/00 (2006.01); G02B 27/42 (2006.01); G02B 27/44 (2006.01); G02B 30/40 (2020.01); H04N 9/31 (2006.01)
CPC G02B 27/0172 (2013.01) [G02B 5/18 (2013.01); G02B 6/0016 (2013.01); G02B 6/0026 (2013.01); G02B 27/0081 (2013.01); G02B 27/4205 (2013.01); G02B 27/44 (2013.01); G02B 30/40 (2020.01); H04N 9/3152 (2013.01); G02B 2005/1804 (2013.01); G02B 5/1819 (2013.01); G02B 2027/0123 (2013.01); G02B 2027/0125 (2013.01); G02B 2027/0174 (2013.01); G02B 2027/0178 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A display apparatus comprising:
a light guide plate comprising an input coupler and an output coupler; and
an image providing apparatus facing the input coupler and configured to provide an image to the input coupler,
wherein the input coupler comprises a plurality of sub input couplers configured to propagate an image provided from the image providing apparatus at different angles in the light guide plate, and
wherein the image providing apparatus comprises:
a spatial light modulator comprising a plurality of display regions respectively corresponding to the plurality of sub input couplers; and
a light source configured to provide coherent illumination light to the spatial light modulator, and
wherein the display apparatus further comprises a diffraction grating disposed between the light source and the spatial light modulator, the diffraction grating being configured to diffract the coherent illumination light incident from the light source such that a respective traveling direction of the coherent illumination light incident on each display region of the plurality of display regions of the spatial light modulator is different from traveling directions of the coherent illumination light incident on other display regions of the plurality of display regions,
wherein the diffraction grating is configured to diffract the coherent illumination light into a −1st order portion, a 0th order portion, and a +1st order portion,
wherein the plurality of display regions of the spatial light modulator comprises a first display region on which the −1st order portion of the coherent illumination light is incident, a second display region on which the 0th order portion of the coherent illumination light is incident, and a third display region on which the +1st order portion of the coherent illumination light is incident, and
wherein a width of the diffraction grating is greater than that of the spatial light modulator and the width of the spatial light modulator is greater than that of the input coupler relative to the light source such that a portion of the 0th order portion of the coherent illumination light transmitted through the first display region or the third display region is not incident on the input coupler, a portion of the −1st order portion of the coherent illumination light transmitted through the second display region or the third display region is not incident on the input coupler, and a portion of the +1st order portion of the coherent illumination light transmitted through the first display region or the second display region is not incident on the input coupler.