AR Holographic Display Using Optical Waveguide and HOE
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Solution Overview
Problem
Existing holographic displays for augmented reality (AR) are bulky and complex, making them difficult to implement in AR displays effectively.
Innovation Solution
A compact and simple AR optical waveguide display system using holographic optical elements (HOEs) and an optical waveguide to propagate and modulate light for displaying hologram images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a traditional 4f system with multiple lenses is used for holographic display, then complete 3D image quality is improved, but system volume and structural complexity increase significantly
Solution Approach 1:
The patent combines multiple optical functions (beam expansion, spatial filtering, Fourier transformation, and hologram generation) into a single integrated optical system. The SLM itself performs both spatial modulation and Fourier transformation functions that traditionally required separate lenses and filters, significantly reducing system volume while maintaining holographic image quality.
Solution Approach 2:
The spatial light modulator (SLM) is designed to perform multiple functions simultaneously: it acts as both the hologram display element and the spatial filter, while also performing beam expansion and Fourier transformation. This multi-functionality eliminates the need for separate optical components, reducing overall system complexity and volume.
2Measurement precision
If a traditional 4f system with multiple lenses is used for holographic display, then complete 3D image quality is improved, but device complexity increases
Solution Approach 1:
The patent merges multiple optical components (lenses, spatial filters, beam expanders) into a single integrated SLM-based system. By combining these functions into one device, the number of components and alignment requirements are reduced, significantly simplifying the overall system architecture while preserving holographic image quality.
Solution Approach 2:
The patent replaces mechanical optical components (physical lenses and filters) with a programmable SLM that performs the same functions through spatial light modulation. This substitution eliminates mechanical alignment and assembly complexity while maintaining the optical functionality required for high-quality hologram generation.
3Ease of operation
If an amplitude-type SLM is used with 4f system, then hologram image can be displayed, but spatial filtering and signal processing become complex
Solution Approach 1:
The SLM performs spatial filtering and signal processing automatically through its programmed pixel modulation patterns. The device self-regulates the spatial frequency content by adjusting pixel phases and amplitudes according to the desired hologram output, eliminating the need for external spatial filters and complex post-processing operations.
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 proposed system enables the display of hologram images in a small and simple configuration, enhancing the feasibility of AR holographic displays by reducing bulkiness and complexity.
Implementation Method 1
an optical waveguide through which the emitted beam enters and progresses; a plurality of holographic optical elements (HOEs) configured to propagate the beam entering the optical waveguide inside the optical waveguide while totally reflecting the beam
Implementation Method 2
a lens configured to converge and then diffuse a beam emitted from a laser, and to allow the beam to enter the optical waveguide
Implementation Method 3
a system should be considered to allow a collimated laser beam to enter a complex field, which is able to reproduce both an amplitude and a phase, in order to completely reproduce a desired wave front through diffraction and interference principles based on wave optics
Implementation Method 4
a system should be considered to allow a collimated laser beam to enter a complex field, which is able to reproduce both an amplitude and a phase, in order to completely reproduce a desired wave front through diffraction and interference principles based on wave optics
Data Source
AI summary
Provided is a technology for implementing an AR optical waveguide display capable of showing a hologram image by means of a small and simple system configuration by using an HOE. A holographic display according to an embodiment of the present invention comprises: a light source module for emitting a beam; an optical waveguide through which the emitted beam is incident and propagated; a plurality of holographic optical elements (HOES) for propagating the beam incident to the optical waveguide inside the optical waveguide while totally reflecting the beam; and a modulator for reproducing a holographic image through the progressing beam and propagating the beam to the inside of the optical waveguide while totally reflecting the beam. Accordingly, it is possible to implement, as a small and simple system, an optical waveguide display showing an AR hologram by using an optical waveguide and an HOE.