US 2025/0383232 A1 · Method of Measuring the Contrast of a Holographic Projector

Abstract

There is provided a method for determining an intensity ratio of a holographic replay field. The method comprises forming a holographic replay field at a plane comprising a housing, wherein the holographic replay field comprises an image area and a non-image area. The method further comprises displaying a first feature at a first position of the holographic replay field. The method further comprises measuring an intensity IA of the first feature using a first light detector, wherein the first light detector is disposed on the housing. The method further comprises displaying a second feature at a second position of the holographic replay field, wherein the second feature is substantially identical to the first feature and forms a conjugate at the position of a second light detector. The second light detector is disposed on the housing. The method further comprises measuring an intensity IB′ of the conjugate image of the second feature using the second light detector. The method further comprises calculating a ratio of the intensities IA, IB′ of the first feature and the conjugate image of the second feature.

Claims20

Dependent claims

A method for determining an intensity ratio of a holographic replay field, the method comprising:

forming a holographic replay field at a plane comprising a housing, wherein the holographic replay field comprises an image area and a non-image area;
displaying a first feature at a first position of the holographic replay field;
measuring an intensity IA of the first feature using a first light detector, wherein the first light detector is disposed on the housing;
displaying a second feature at a second position of the holographic replay field, wherein the second feature is substantially identical to the first feature and forms a conjugate at the position of a second light detector, wherein the second light detector is disposed on the housing;
measuring an intensity IB′ of the conjugate image of the second feature using the second light detector;
and
calculating a ratio of the intensities IA, IB′ of the first feature and the conjugate image of the second feature.

4 more elements

A holographic projection system comprising:

a light source arranged to output light;
a housing
a display device arranged to display a diffractive pattern comprising a hologram of a target image and to receive light from the light source and output spatially modulated light in accordance with the diffractive pattern to form a holographic replay field of the target image at a replay plane, wherein the housing is located at the replay plane, wherein the holographic replay field comprises an image area and a non-image area, the display device arranged to display a first feature at a first position of the holographic replay field;
a first light detector disposed on the housing;
a second light detector disposed on the housing;
and
a processor arranged to:
measure an intensity la of the first feature using the first light detector;
display a second feature at a second position of the holographic replay field, wherein the second feature is substantially identical to the first feature and forms a conjugate at the position of the second light detector;
measure an intensity IB′ of the conjugate image of the second feature using the second light detector;
and
calculate a ratio of the intensities IA, IB′ of the first feature and the conjugate image of the second feature.

9 more elements

Dependencies are inferred from the claim text.

Method of Measuring the Contrast of a Holographic Projector

Life of this patent

Method of Measuring the Contrast of a Holographic Projector

Life of this patent

Abstract

Claims20