DIFFRACTIVE OPTICAL ASSEMBLY AND HEAD-MOUNTED DISPLAY HAVING THE SAME
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United States of America
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Issued Date -
Nov 28, 2024
app pub date -
May 23, 2023
filing date -
May 23, 2023
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Abstract
A diffractive optical assembly includes an input coupler, an output coupler, and an image source. The output coupler is next to the input coupler. One of the input coupler and the output coupler has a most critical holographic optical element (HOE), and another one has a diffractive optical element (DOE). Bragg condition of the most critical HOE is more sensitive than Bragg condition of the DOE. The image source is configured to generate image light that is incident to the input coupler then propagates to the output coupler. The image light has incident angles to the input coupler and wavelengths corresponding to the incident angles. The wavelengths of the image light on the image source have a two-dimensional spatial distribution, such that relationships between the incident angles and the wavelengths of the image light comply with Bragg selectivity of the most critical HOE.
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