AR Display Device Diffractive Elements Depth Control
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Solution Overview
Problem
Existing augmented reality (AR) display systems for vehicles, such as head-up displays (HUDs), face challenges in effectively matching virtual images with actual driving information and maintaining image clarity and resolution, particularly in three-dimensional displays.
Innovation Solution
A display device incorporating a light guide plate with adjacent diffractive optical elements that form virtual images at different depths, utilizing a holographic scheme and laser interference lithography, to provide clear and distortion-free AR displays for drivers, with the ability to control image depth based on the reference beam from display engines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a static location display method is used in AR-HUD, then the display structure is simple, but the virtual image cannot be matched with actual driving information dynamically
Solution Approach 1:
The patent implements dynamic virtual image display by controlling multiple display engines to generate light at different depths, allowing the virtual image position to be adjusted dynamically to match actual driving information, transforming the static display into a dynamic adaptive system
Solution Approach 2:
The patent divides the display system into multiple independent display engines, each responsible for generating light at a specific depth, enabling dynamic matching through coordinated control of segmented display units without requiring a completely complex integrated structure
2Measurement precision
If multiple virtual images at different depths are displayed, then the AR information clarity is improved, but the image distortion increases
Solution Approach 1:
The patent applies different optical characteristics to different depth layers by using multiple display engines with distinct light guiding paths, allowing each depth plane to be optimized independently for clarity while minimizing distortion through localized optical control
Solution Approach 2:
The light guide plate serves as an intermediary medium that separates and guides light from multiple display engines at different depths, preventing direct mixing of light paths and reducing image distortion while maintaining clear AR information display
3Adaptability or versatility
If light from multiple display engines is guided together, then the AR display functionality is enhanced, but the light paths may mix causing image degradation
Solution Approach 1:
The light guide plate is divided into multiple light guiding regions that independently guide light from different display engines, preventing light path mixing while maintaining enhanced AR display functionality through coordinated operation of segmented light guiding channels
Solution Approach 2:
The light guide plate acts as an intermediary structure with distinct light guiding regions that separate and control light paths from multiple display engines, ensuring reliable image quality by preventing unwanted light mixing while enabling versatile AR display functions
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 solution enables the display of virtual images at precise depths, enhancing the clarity and resolution of AR information, preventing image distortion and allowing for the simultaneous verification of navigation and actual road conditions, thereby improving the usability of AR systems in vehicles.
Implementation Method 1
a plurality of diffractive optical elements each configured to emit light guided in a light guide plate to a user
Implementation Method 2
a light guide plate configured to internally guide the light emitted from the display panel
Implementation Method 3
Each of the plurality of diffractive optical elements may comprise a holographic optical element configured by a laser interference lithography scheme
Data Source
AI summary
A display device is provided. The display device includes a plurality of diffractive optical elements each configured to emit light guided in a light guide plate to a user. Virtual images by the light are observed by the user at two or more different depths according to the plurality diffractive elements.