Patent ID: 11906892
Assignee: APPOTRONICS CORPORATION LIMITED
Field: Optics (Instruments)
Classification: CPC G | IPC G

Claim 0:
1. A total reflection screen for reflecting projection light from a projector into a field of view of a viewer, comprising a light diffusing layer, a total reflection layer, and a light absorbing layer that are arranged sequentially from an incident side for the projection light,
wherein the light absorbing layer is configured to absorb incident light, and the light diffusing layer is configured to increase a divergence angle of emergent light,
wherein the total reflection layer comprises at least a microstructure layer located on a side of the total reflection layer close to the light diffusing layer and an inner layer located on a side of the total reflection layer close to the light absorbing layer, wherein a refractive index of the microstructure layer is greater than that of the inner layer, and the microstructure layer is provided with a plurality of microstructure units thereon which extend continuously in a plane of the total reflection screen and are rotationally symmetrical, wherein each of the microstructure units comprises two intersecting planes which are configured in such a manner that the projection light is incident in a direction inclining from a direction perpendicular to the plane of the total reflection screen and is totally reflected at both of the two intersecting planes successively, and ambient light is transmitted through the total reflection layer and absorbed by the light absorbing layer, and
wherein a refractive index n1 of the microstructure layer and a refractive index n2 of the inner layer satisfy a relationship of n2<n1−0.2.