Servo Beam Feedback for Scanning Display Alignment
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Solution Overview
Problem
Scanning-beam display systems face challenges in maintaining accurate optical alignment and precise delivery of optical pulses due to factors like component aging, temperature changes, and manufacturing tolerances, leading to potential misalignment and image quality deterioration.
Innovation Solution
The implementation of a servo control mechanism using a designated servo beam with a wavelength different from the excitation beam, scanned over the screen to provide feedback control, ensuring proper alignment and timing adjustments of the excitation beam pulses, employing optical servo sensors and reflective stripe dividers to detect positioning errors and correct beam alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a scanning beam display system uses fixed optical components, then the system structure is simple, but optical alignment accuracy deteriorates due to component aging, temperature changes, and manufacturing tolerances
Solution Approach 1:
The patent implements a feedback control system where a servo beam reflects off the screen and is detected by optical sensors to generate feedback signals. These signals continuously monitor the actual positions of the scanning beams and are used to dynamically adjust the timing and positioning of excitation pulses, compensating for alignment deviations caused by component aging, temperature changes, and manufacturing tolerances.
Solution Approach 2:
The patent introduces a servo beam as an intermediary element that carries alignment information from the screen back to the control system. This servo beam acts as a mediator between the optical components and the control mechanism, enabling indirect measurement and correction of alignment errors without directly interfering with the primary image-forming excitation beams.
2Measurement precision
If the system uses dynamic timing adjustment for optical pulses, then optical alignment accuracy is improved, but the control system complexity increases
Solution Approach 1:
The control system receives feedback signals from optical sensors that detect the actual positions of reflected servo beams. These feedback signals are processed to generate timing adjustment commands that dynamically modify the emission timing of excitation pulses, ensuring that optical pulses are delivered precisely to the intended spatial locations on the screen despite variations in optical component positions.
Solution Approach 2:
The system transitions from static, fixed timing to dynamic, adjustable timing for optical pulse delivery. The timing of excitation pulses is continuously modified based on real-time feedback about beam positions, allowing the system to adapt to changing conditions and maintain alignment precision without requiring physically adjustable optical components.
3Reliability
If environmental conditions and manufacturing tolerances are strictly controlled, then optical alignment stability is improved, but manufacturing cost and operational constraints increase
Solution Approach 1:
The system implements self-correction by using the servo beam and optical sensors to automatically detect and compensate for alignment deviations. The feedback control mechanism enables the display system to self-adjust timing parameters without external intervention or manual realignment, maintaining optical alignment stability despite environmental variations and manufacturing tolerances.
Solution Approach 2:
The patent employs continuous feedback monitoring of beam positions through optical sensors detecting reflected servo beams. This feedback enables the system to automatically compensate for drift caused by temperature changes, component aging, and manufacturing variations, maintaining reliable optical alignment without requiring stringent environmental controls or expensive precision manufacturing.
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 ensures accurate and stable image formation by maintaining precise alignment of optical pulses, reducing misalignment errors and enhancing image quality despite environmental and manufacturing variations.
Implementation Method 1
a light-emitting layer of parallel light-emitting stripes which absorb light of the excitation beam to emit visible light
Implementation Method 2
light-emitting stripes which absorb light of the excitation beam to emit visible light to produce images
Implementation Method 3
the screen configured to reflect light of the servo beam towards the light module to produce servo feedback light
Implementation Method 4
facets facing the excitation light source that are specularly reflective to light of the servo beam
Implementation Method 5
a Fresnel lens located between the screen and the light module to direct the scanning servo beam and excitation beam
Implementation Method 6
areas outside the servo feedback marks that are diffusively reflective to light of the servo beam
Data Source
AI summary
Scanning beam display systems that scan one servo beam and an excitation beam onto a screen that emits visible light under excitation of the light of the excitation beam and control optical alignment of the excitation beam based on positioning of the servo beam on the screen via a feedback control.