Piezoelectric Waveguide Modulation for AR Chromatic Aberration
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Solution Overview
Problem
Conventional chromatic aberration adjustment methods fail to finely correct chromatic aberration in augmented reality (AR) display devices due to structural differences, leading to image quality issues.
Innovation Solution
An augmented reality display apparatus with a control device that adjusts the deformation of modulation portions using power voltage to control the reflection direction of image light, employing piezoelectric ceramics and reflecting layers to correct chromatic aberration by changing the reflection direction of primary lights.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If conventional chromatic aberration adjustment methods are used, then the adjustment process is simple, but the correction precision is insufficient for AR display devices with different structures
Solution Approach 1:
The patent employs piezoelectric ceramics to create dynamically adjustable modulation portions that can change their deformation degree in real-time based on applied voltage. This dynamic adjustment capability allows the system to adapt to different AR display device structures and achieve precise chromatic aberration correction for multiple devices, resolving the contradiction between correction precision and device complexity
Solution Approach 2:
The patent changes physical parameters of the modulation portions by applying different voltages to the piezoelectric ceramics, which alters the deformation degree and consequently the reflection direction of image light. This parameter change approach enables fine-tuned chromatic aberration correction while maintaining a relatively simple overall system structure
2Adaptability or versatility
If special treatment of total reflective coating is applied, then the adjustment method is conventional and easy to implement, but it cannot solve chromatic aberration caused by quality differences in different AR display devices
Solution Approach 1:
The patent divides the waveguide into multiple modulation portions, each equipped with piezoelectric ceramics that can be independently controlled. This segmentation allows different regions of the waveguide to be adjusted independently, enabling the system to compensate for quality differences and chromatic aberration variations across different AR display devices
Solution Approach 2:
The patent implements a feedback mechanism where the control device receives information about the actual chromatic aberration and adjusts the voltage applied to piezoelectric ceramics accordingly. This closed-loop feedback system enables the apparatus to adapt to different device qualities and achieve consistent correction results across various AR display devices
3Measurement precision
If piezoelectric ceramics are used to change deformation degree, then the reflection direction can be precisely controlled, but the device structure becomes more complex
Solution Approach 1:
The patent merges the piezoelectric ceramic element directly with the reflective surface to form an integrated modulation portion. This combination eliminates the need for separate actuation mechanisms and reduces overall structural complexity while maintaining precise reflection direction control through voltage-driven deformation of the piezoelectric material
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 apparatus effectively corrects chromatic aberration by dynamically controlling the reflection direction of image light, improving image quality and user experience across different AR display devices.
Implementation Method 1
each of the plurality of modulation portions comprises a piezoelectric ceramic and a reflecting layer on a surface of the piezoelectric ceramic facing the display device
Implementation Method 2
an optical waveguide comprising a plurality of modulation portions, each of the plurality of modulation portions being configured to receive and reflect the image light
Data Source
AI summary
An augmented reality display apparatus includes a display device for emitting image light, an optical waveguide including a plurality of modulation portions, and a control device connected to the plurality of modulation portions. Each of the plurality of modulation portions is configured to receive and reflect the image light, the optical waveguide is configured to receive and guide the image light to human eye. The control device is configured to provide a power voltage to each of the plurality of modulation portions. A deformation degree of each of the plurality of modulation portions changes with a value of the power voltage, and the control device is further configured to control a direction of the image light by controlling the deformation degree of the plurality of modulation portions. A chromatic aberration adjustment method is also provided.