Multi-Region Scanning Beam Display With Servo Feedback
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Solution Overview
Problem
Large-scale scanning-beam display systems face challenges in minimizing depth without increasing cost, as they require complex optical paths and precise, expensive scanning components to achieve precise beam coordination over large imaging surfaces.
Innovation Solution
The implementation of a display system with multiple constituent display regions, each addressed by a separate scanning beam engine using a servo feedback system, which allows for the use of lower accuracy and lower cost resonant scanning mirrors, reducing the system's depth by dividing the scanning area into smaller regions and employing a servo feedback system for precise beam alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If a single scanning beam engine is used to cover a large display area, then the imaging surface is large, but the system depth increases and cost increases due to requiring high-precision expensive scanning components
Solution Approach 1:
The display screen is divided into multiple display regions, with each region addressed by a separate scanning beam from a multi-beam scanning engine. This segmentation allows each beam to cover a smaller area with lower precision requirements, reducing the system depth while maintaining a large overall display area.
2Manufacturing precision
If high-precision scanning components are used to achieve precise beam coordination, then beam alignment accuracy is high, but system cost increases
Solution Approach 1:
A servo feedback system is implemented where servo beams scan dedicated feedback marks on the display screen, and servo detectors detect the reflected light to generate position feedback signals. This feedback enables real-time adjustment of beam positions, achieving high alignment precision using lower-cost scanning components that would otherwise be insufficiently precise.
3Ease of manufacture
If lower accuracy scanning components are used to reduce cost, then system cost decreases, but beam coordination precision deteriorates
Solution Approach 1:
Servo feedback marks are introduced as intermediary elements on the display screen. These marks serve as reference points that enable the servo system to measure and correct beam positions, allowing lower-precision scanning components to achieve high effective precision through the intermediary feedback mechanism.
4Length of stationary object
If multiple scanning beam engines are used to address multiple display regions, then system depth decreases, but device complexity increases
Solution Approach 1:
Multiple scanning beams are combined within a single scanning engine architecture, sharing common optical components and control systems. The servo feedback system also operates in unification, with feedback marks and detectors managing all beams centrally. This merging reduces overall system complexity compared to using entirely separate scanning engines for each display region.
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 approach decreases the depth of the display system while maintaining cost-effectiveness by utilizing multiple lower-cost scanning components and achieving precise beam coordination, enabling thinner and more efficient large-scale displays.
Implementation Method 1
a resonant scanning mirror configured to scan the scanning beams along a first scanning direction across the associated display region
Implementation Method 2
a linear scanning mirror to scan the scanning beams along a second scanning direction across the associated display region
Implementation Method 3
a servo feedback detector positioned to receive feedback light of the servo beam from the associated display region, to detect the servo feedback mark from the feedback light
Data Source
AI summary
A display system includes a display screen with at least one servo feedback mark in each of a plurality of display regions, and a plurality of subsystems each subsystem configured to generate an image on an associated display region. Each subsystem generate a plurality of scanning beams including an excitation beam and a servo beam, a beam scanning module, a servo feedback detector, and a controller. The beam scanning module includes a resonant scanning mirror configured to scan the scanning beams along a first scanning direction and a linear scanning mirror to scan the scanning beams along a second scanning direction. The controller is configured to receive image data, to modulate the excitation beam in accordance with the image data, and to control timing of modulation of the excitation beam based on the monitor signal to align the modulation with corresponding pixel positions on the display screen.