US 11,942,003 B2
Video image display system
Hideaki Hayashi, Tokyo (JP); Yoshinori Iguchi, Tokyo (JP); and Yukihiro Tao, Tokyo (JP)
Assigned to AGC Inc., Tokyo (JP)
Filed by AGC Inc., Tokyo (JP)
Filed on Jan. 24, 2022, as Appl. No. 17/648,715.
Application 17/648,715 is a continuation of application No. PCT/JP2020/032230, filed on Aug. 26, 2020.
Claims priority of application No. 2019-156656 (JP), filed on Aug. 29, 2019.
Prior Publication US 2022/0171273 A1, Jun. 2, 2022
Int. Cl. G09F 19/18 (2006.01); B60K 35/00 (2006.01); G01S 19/42 (2010.01); G01S 19/52 (2010.01); G03B 21/62 (2014.01); H04N 9/31 (2006.01)
CPC G09F 19/18 (2013.01) [B60K 35/00 (2013.01); G01S 19/42 (2013.01); G01S 19/52 (2013.01); G03B 21/62 (2013.01); H04N 9/312 (2013.01); H04N 9/3155 (2013.01); B60K 2370/152 (2019.05)] 17 Claims
OG exemplary drawing
 
1. A video image display system comprising:
a projection device; and
a transmissive transparent screen having a first surface and a second surface on the opposite side of the first surface, having a visible light transmittance of at least 5 [%], and displaying video images projected from the projection device installed on a side of the first surface as video images visible to an observer on a side of the second surface,
wherein said video image display system satisfying Formula 1:
−1.5<ln(((B/A)/I)×G)<3.9  Formula 1
in the Formula 1, A is the projection area [m2] of the projection device, B is the luminous flux [lm] projected onto A by the projection device, I is the ambient illuminance [lx] at the side of the second surface, and G is the screen gain of the transmissive transparent screen,
wherein the transmissive transparent screen comprises a first transparent substrate provided on the side of the first surface, and a second transparent substrate provided on the side of the second surface,
wherein the second transparent substrate is gray, which is uniform throughout an entire visible light of 0.25<x<0.4, 0.25<y<0.4 in xyY color system.