US 12,379,691 B2
Spatial property or color implementation property measurement device of holographic images
Kwang Hoon Lee, Anyang-si (KR); Kyung Il Joo, Naju-si (KR); Seon Kyu Yoon, Gwangju (KR); Jin Su Lee, Gwangju (KR); Min Kyu Park, Gwangju (KR); and Hoe Min Kim, Gwangju (KR)
Assigned to Korea Photonics Technology Institute, Gwangju (KR)
Filed by Korea Photonics Technology Institute, Gwangju (KR)
Filed on Dec. 15, 2022, as Appl. No. 18/082,561.
Claims priority of application No. 10-2021-0190709 (KR), filed on Dec. 29, 2021; and application No. 10-2021-0190713 (KR), filed on Dec. 29, 2021.
Prior Publication US 2023/0204454 A1, Jun. 29, 2023
Int. Cl. G03H 1/22 (2006.01); G01B 9/02 (2022.01); G02B 5/18 (2006.01); G03H 1/26 (2006.01)
CPC G03H 1/2294 (2013.01) [G01B 9/02047 (2013.01); G03H 1/2202 (2013.01); G03H 1/265 (2013.01); G02B 5/18 (2013.01); G03H 2001/2247 (2013.01); G03H 2001/2263 (2013.01); G03H 2226/11 (2013.01); G03H 2227/03 (2013.01)] 4 Claims
OG exemplary drawing
 
1. A spatial property measurement device of a holographic image output from a holographic display device, the spatial property measurement device comprising:
a light receiver receiving and sensing light output from a light source within the holographic display device and diffracted from a spatial light modulator within the holographic display device;
a diffraction element disposed in front of the light receiver in a direction in which the light diffracted from the spatial light modulator is incident and re-diffracting the light diffracted from the spatial light modulator;
a rotation element fixed within a predetermined range from the spatial light modulator at one end and fixed to the light receiver at the other end to rotate the light receiver and adjusting a distance between the light receiver and the spatial light modulator; and
a controller adjusting the rotation angle of the rotation element and the distance between the light receiver and the spatial light modulator and analyzing the sensed value by the light receiver, thereby determining whether there is an abnormality in the arrangement of the spatial light modulator or the diffraction property of the spatial light modulator in the holographic display device,
wherein the controller determines whether there is an abnormality in the arrangement of the spatial light modulator in the holographic display device based on whether the angle of the point having the strongest light amount among the values sensed by the light receiver changes for each distance while changing the distance between the light receiver and the spatial light modulator.