Resonant and Polygon Mirror Beam Scanning Engine
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Solution Overview
Problem
Existing scanning-beam display systems face challenges in reducing depth without increasing cost, particularly in large-scale displays where separate scanning beams are needed for each display region, and in achieving high resolution while minimizing the number of lasers or complex beam splitting optics.
Innovation Solution
The implementation of a display system that uses a combination of resonant scanning mirrors and rotating polygon scanning mirrors to create interlaced scan lines across multiple display regions, allowing for precise alignment and modulation of light beams using servo feedback control, thereby reducing system depth and cost.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If separate scanning beams are used for each display region in large-scale displays, then display coverage is improved, but system depth and cost increase
Solution Approach 1:
The display screen is divided into multiple display regions, with each region addressed by a separate scanning beam engine. This segmentation allows each beam to be optimized for its specific region while collectively covering the entire display area, resolving the contradiction between coverage and depth.
Solution Approach 2:
The patent introduces multiple beam scanning engines operating in parallel across different spatial dimensions. By distributing the scanning function across multiple independent beams rather than using a single deep optical path, the system achieves extended display coverage without proportionally increasing depth.
2Manufacturing precision
If multiple lasers or complex beam splitting optics are used to achieve high resolution, then image quality is improved, but device complexity and cost increase
Solution Approach 1:
Each scanning beam engine is designed as a universal module that can address multiple display regions through coordinated operation. The beam scanning modules perform multiple functions (scanning, focusing, and region-specific addressing) using the same basic components, reducing overall system complexity while maintaining high resolution.
Solution Approach 2:
Instead of using complex beam splitting optics to direct a single laser beam through multiple paths, the system uses multiple simplified scanning beam engines that independently scan across different regions. This copying approach replaces complex optical networking with parallel simplified units, reducing device complexity while achieving the same resolution.
3Ease of manufacture
If lower accuracy scanning components are used, then cost is reduced, but alignment precision deteriorates
Solution Approach 1:
The system incorporates feedback mechanisms that allow lower accuracy scanning components to be dynamically adjusted during operation. By monitoring beam position and scan line timing, the system compensates for component inaccuracies in real-time, maintaining precise alignment while using more affordable scanning components.
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 enables a reduction in the depth of the display system while maintaining high resolution and reducing costs, by utilizing lower accuracy and lower cost scanning components and minimizing the need for complex optics or multiple lasers.
Implementation Method 1
a resonant scanning mirror configured to scan the light beam along a first scanning direction across the associated display region
Implementation Method 2
a polygon scanning mirror to scan the light beam along a second scanning direction across the associated display region. The polygon scanning mirror has a plurality of facets
Data Source
AI summary
A display system includes a display screen, a light source to generate a light beam to be modulated in accordance with image data, and a beam scanning module to receive the light beams and to direct the light beam onto an associated display region of the display screen. The beam scanning module includes a resonant scanning mirror configured to scan the light beam along a first scanning direction across the associated display region, and a polygon scanning mirror to scan the light beam along a second scanning direction across the associated display region.