Holographic Projection Optics With Split Phase Compensation
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Solution Overview
Problem
Holographic display systems suffer from aberration issues such as astigmatism, chromatic aberration, spherical aberration, coma aberration, and distortion, which negatively impact imaging quality and have not been effectively addressed by existing methods.
Innovation Solution
A projection system comprising a phase compensation apparatus and a holographic combiner that performs first and second phase compensation, respectively, to correct these aberrations, with the holographic combiner also enlarging the image and the phase compensation apparatus reducing the optical path length to minimize system size and simplify production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a holographic display system is implemented, then high diffraction efficiency and wavelength selectivity are achieved, but aberration problems such as astigmatism, chromatic aberration, spherical aberration, coma aberration, and distortion occur
Solution Approach 1:
The invention divides the phase compensation function into multiple segments: the first phase compensation optical element handles certain aberrations, the second phase compensation optical element handles other aberrations, and the holographic combiner performs additional phase compensation. This segmentation allows each element to be optimized for specific correction tasks, effectively addressing multiple aberration types simultaneously while maintaining high diffraction efficiency
Solution Approach 2:
The invention introduces phase compensation optical elements as intermediary components between the light source and the holographic combiner. These intermediary elements pre-correct the light waves before they reach the holographic combiner, reducing the burden on the combiner and improving overall imaging quality without compromising the combiner's diffraction efficiency
2Volume of moving object
If the projection system size is reduced through optical path folding, then compact design is achieved, but system complexity increases
Solution Approach 1:
The invention combines multiple functions into integrated optical elements. The phase compensation apparatus and holographic combiner work together as a unified system, where the combiner serves both as a beam combiner and a phase compensation element. This merging reduces the number of separate components needed, achieving compact size while managing complexity through functional integration
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system significantly improves imaging quality by effectively correcting aberrations and reducing the size and complexity of the projection system, while allowing for a compact and efficient design.
Implementation Method 1
The phase compensation apparatus is configured to perform first phase compensation and chromatic aberration correction on a light ray of a received image
Implementation Method 2
The phase compensation apparatus is configured to perform first phase compensation and chromatic aberration correction on a light ray of a received image
Implementation Method 3
The holographic combiner is configured to perform second phase compensation on the light ray that is of the image and that is output by the phase compensation apparatus
Implementation Method 4
a holographic display system uses holographic optical elements, which have good wavelength selectivity and angle selectivity, and high diffraction efficiency
Implementation Method 5
the holographic combiner is further configured to enlarge the light ray of the image
Implementation Method 6
the phase compensation apparatus reflects an optical path to the holographic combiner
Data Source
AI summary
A projection system is provided, and includes: a phase compensation apparatus (101), configured to perform first phase compensation and chromatic aberration correction on a light ray of a received image, and reflect an output light ray of the image to a holographic combiner (102); and the holographic combiner (102), configured to perform second phase compensation on the light ray that is of the image and that is output by the phase compensation apparatus (101). The phase compensation apparatus (101) is utilized to correct at least one of the following aberrations: astigmatism, a spherical aberration, and a coma aberration; and further correct another aberration in combination with the holographic combiner (102), thereby effectively eliminating aberrations and improving imaging quality. The projection system is used in a head-up display system, an augmented reality display system, a head-mounted display device, and the like.