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US 11,892,766 B2Granted
Projection screen
AssigneeAppotronics Corporation Limited
InventorsLin Wang, Xiaofeng Tang, Wei Sun, Yi Li
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Abstract
Provided is a projection screen, the taper angles of a plurality of triangular pyramid units arranged in an array are designed to gradually change according to a predetermined relationship, so that the image light emitted from the projector is reflected by a microstructure layer with a triangular pyramid unit and then converges to a range centered on the human eye, which reduces the difference in brightness at different viewing positions, so as to ensure that the projection screen has high brightness uniformity and high gain.
Claims12
A projection screen, comprising:
- a microstructure layer comprising a matrix layer and a microstructure unit formed on a surface of the matrix layer,
- wherein the microstructure unit comprises triangular pyramid units arranged in an array, wherein each of the triangular pyramid units comprises a light output surface attached to and fixed to the surface of the matrix layer;
- wherein at least two of the triangular pyramid units that are arranged in a same row are identical to each other;
- wherein at least two triangular pyramid units of the triangular pyramid units that are arranged in a same column vary gradually;
- and wherein each of the taper angles forms between a base of one of the at least two triangular pyramid units that has the taper angle and an edge, parallel to a column direction, of the triangular pyramid unit, wherein the base is a surface of the triangular pyramid unit other than the light output surface and two surfaces that intersect to form the edge;
- and
- wherein each of the taper angles of the at least two triangular pyramid units arranged along the column direction satisfy
- θ
- =
- 180
- +
- arcsin
-
- (
- sin
-
- α
-
- 1
- n
- )
- +
- arcsin
-
- (
- sin
-
- α
-
- 4
- n
- )
- 2
- ,
- where θ denotes the taper angle of one of the at least two triangular pyramid units, α1 denotes an incident angle of image light, α4 denotes an emergent angle of the image light, and n denotes a refractive index of the triangular pyramid unit.
32 more elements
Dependencies are inferred from the claim text.