Patent ID: 11942003
Assignee: AGC INC.
Field: Audio-visual technology (Electrical engineering)
Classification: CPC G  B  H | IPC B  G  H

Claim 0:
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.