US 12,306,427 B2
Video display device and video display system
Ryuji Ukai, Tokyo (JP); Takahiro Mouri, Tokyo (JP); Takeru Utsugi, Tokyo (JP); Toshiteru Nakamura, Tokyo (JP); Takuma Kuno, Tokyo (JP); and Masahito Uchiyama, Tokyo (JP)
Assigned to HITACHI-LG DATA STORAGE, INC., Tokyo (JP)
Appl. No. 17/764,623
Filed by HITACHI-LG DATA STORAGE, INC., Tokyo (JP)
PCT Filed Oct. 6, 2020, PCT No. PCT/JP2020/037878
§ 371(c)(1), (2) Date Mar. 29, 2022,
PCT Pub. No. WO2021/090625, PCT Pub. Date May 14, 2021.
Claims priority of application No. 2019-202922 (JP), filed on Nov. 8, 2019.
Prior Publication US 2022/0413204 A1, Dec. 29, 2022
Int. Cl. F21V 8/00 (2006.01); G02B 27/01 (2006.01); H04N 9/31 (2006.01)
CPC G02B 6/0018 (2013.01) [G02B 27/0172 (2013.01); H04N 9/315 (2013.01); H04N 9/3182 (2013.01); H04N 9/3188 (2013.01)] 13 Claims
OG exemplary drawing
 
1. A video display device for displaying a video, the video display device comprising:
a video projection unit configured to project video light;
a video deflection unit including a deflection prism having a first surface and a second surface angled with respect to the first surface at a first angle; and
a light guide portion including a light guide plate, the light guide plate including a first internal reflection surface, a second internal reflection surface, which is parallel to the first internal reflection surface, and a plurality of beam splitter surfaces disposed between the first internal reflection surface and the second internal reflection surface at the first angle,
wherein the video deflection unit deflects the video light emitted by the video projection unit and causes the video light to propagate to the light guide portion,
wherein the light guide portion causes the entered video light to propagate therein and outputs the video light,
wherein the video deflection unit or the light guide portion is configured to reduce color dispersion of the video light outputted from the light guide portion,
wherein the video light emitted by the video projection unit is incident on a portion of the first internal reflection surface and passes through the first internal reflection surface of the light guide portion, enters the deflection prism of the video deflection unit and is deflected, and then re-enters the second internal reflection surface of the light guide portion, and
wherein the first surface of the deflection prism adheres to a portion of the second internal reflection surface of the light guide plate that is opposite of the portion of the first internal reflection surface on which the video light emitted by the video projection unit is incident.