Hologram Optical Element for Multi-Focal Virtual Image Displays
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Solution Overview
Problem
Conventional display apparatuses require physical space and mechanical operations to achieve multiple focal lengths for virtual images, leading to instability and user discomfort due to discrepancies between real and virtual images.
Innovation Solution
A display apparatus utilizing a hologram optical element with stacked layers that refract light at different angles based on peak wavelength ranges, allowing for the creation of multiple virtual images with varying focal lengths without physical movement of the display panel.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single display panel is used to create virtual images, then device complexity is reduced, but multiple focal lengths cannot be achieved
Solution Approach 1:
The patent changes the optical parameters of the display system by introducing a hologram optical element that selectively refracts different wavelength ranges at different angles. This allows a single display panel to produce virtual images with different focal lengths by utilizing the wavelength-dependent refraction properties of the hologram element, thereby achieving focal length variation without changing the physical display panel structure.
Solution Approach 2:
The hologram optical element acts as an intermediary between the display panel and the user's eye. It receives light from the single display panel and manipulates the light paths through wavelength-selective refraction, creating multiple virtual images at different focal lengths. This intermediary enables focal length diversity while maintaining a simple single-panel display structure.
2Adaptability or versatility
If multiple display panels are used to achieve different focal lengths, then focal length versatility is improved, but device complexity increases
Solution Approach 1:
Instead of using multiple physical display panels, the patent uses a single display panel combined with a hologram optical element that creates optical copies of the displayed information at different focal lengths. The hologram element generates virtual images that appear at different depths by refracting light from the single panel, effectively copying the visual information at multiple focal planes without requiring multiple physical panels.
3Adaptability or versatility
If the display panel position is moved to change focal length, then focal length adaptability is improved, but mechanical stability deteriorates
Solution Approach 1:
The patent replaces the mechanical system of moving the display panel with an optical system based on wavelength-selective refraction. Instead of physically relocating the display panel to change focal length, the hologram optical element manipulates light paths through its refractive properties, creating virtual images at different focal lengths. This substitution eliminates mechanical movement components, thereby improving system stability and reliability.
4Adaptability or versatility
If physical space is increased to accommodate multiple panels or movement mechanisms, then focal length versatility is improved, but compactness deteriorates
Solution Approach 1:
The patent merges the functions of multiple display panels into a single integrated system consisting of one display panel and a hologram optical element. The hologram element performs the function of multiple panels by creating virtual images at different focal lengths from the light emitted by the single panel, thereby achieving the functionality of multiple panels while maintaining a compact form factor.
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
This solution minimizes physical space and enhances user visibility by providing virtual images with different focal lengths without mechanical operations, improving the stability and clarity of displayed information.
Implementation Method 1
The refraction angle of the light having the second peak wavelength range by the hologram optical element is different from the refraction angle of the light having the first peak wavelength range by the hologram optical element
Data Source
AI summary
A display apparatus providing a virtual image to user is provided. The display apparatus may include a hologram optical element on a path of light emitted from a display panel. The display panel may emit light having different peak wavelength ranges. The reflection angle or the refraction angle recorded in the hologram optical element is different according to the peak wavelength range. Thus, the display apparatus may provide a plurality of virtual images having different focal lengths to the user without physical movement or mechanical operation of the display panel.