Micromirror Projection System Frequency Drift Compensation
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Solution Overview
Problem
In 'flying spot' projection systems, image jitter effects occur due to frequency deviations between the actual and reference frequencies of the mirror movement, leading to reduced image quality, especially when ambient conditions change or thermal drifts affect the mechanical resonance.
Innovation Solution
A method where the time base of the processor controlling the light beam is set based on the deflection of the light beam, using a deflecting projection device like a micromirror, with a controller adjusting the drive frequency of the fast axis to maintain a constant ratio with the slow axis, and incorporating a closed-loop control system for precise modulation of the light intensity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the drive frequency of the fast axis is corrected to maintain constant image size, then the geometric stability is improved, but image information at the end of the row is truncated or rows are displayed compressed
Solution Approach 1:
The patent applies dynamics by making the time base adjustable and adaptive rather than fixed. The system dynamically adjusts the time base according to the actual mirror frequency to maintain both geometric stability and image quality. This is achieved through a feedback mechanism that detects the actual mirror frequency and adjusts the time base accordingly, allowing the system to adapt to frequency variations without truncating image information or compressing rows.
Solution Approach 2:
The patent implements feedback by using the actual mirror frequency as a reference to adjust the time base. The system continuously monitors the actual frequency of the mirror and adjusts the time base to maintain synchronization. This feedback loop ensures that both the geometric size remains constant and the image quality is preserved by preventing truncation and compression artifacts.
2Ease of operation
If a fixed system clock is used for intensity modulation, then the control simplicity is improved, but image information is truncated or compressed when frequency drift occurs
Solution Approach 1:
The patent transforms the fixed system clock into a dynamic time base that can adjust its frequency. Instead of using a static clock frequency, the system employs a time base that adapts to the actual mirror frequency variations. This dynamic adjustment maintains control simplicity while ensuring image completeness, as the time base automatically compensates for frequency drift without requiring complex manual intervention.
Solution Approach 2:
The patent applies parameter changes by modifying the time base frequency based on the actual mirror frequency. The system changes the time base parameter dynamically to match the mirror's operating conditions. This ensures that the intensity modulation remains synchronized with the mirror deflection, preventing image truncation or compression while maintaining ease of operation through automated parameter adjustment.
3Adaptability or versatility
If the mirror frequency deviates from reference frequency, then the adaptation to environmental conditions is improved, but image jitter effects occur and image quality deteriorates
Solution Approach 1:
The patent uses feedback to maintain image stability despite environmental variations. The system monitors the actual mirror frequency and adjusts the time base accordingly. This feedback mechanism allows the system to adapt to environmental conditions (temperature, humidity, pressure) that cause frequency drift, while simultaneously maintaining image stability by compensating for these variations in real-time, thus preventing image jitter effects.
Solution Approach 2:
The patent applies dynamics by making the time base adaptive rather than fixed. The system dynamically adjusts the time base frequency to match the actual mirror frequency, which varies with environmental conditions. This dynamic adaptation allows the system to respond to ambient condition changes while maintaining stable image projection, as the time base continuously synchronizes with the mirror's actual operating frequency.
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 ensures a stable and distortion-free image projection by maintaining the image resolution and avoiding jitter effects, even with changing frequencies, and allows for compensation of manufacturing and environmental frequency deviations.
Implementation Method 1
a two-dimensional resonant micromirror which deflects the common beam two-dimensionally and projects it onto an image plane
Implementation Method 2
directed onto a semitransparent mirror (transmission and reflection of the mirrors are dependent on the wavelength)
Data Source
AI summary
In various embodiments, a method for projecting at least one light beam is provided. The method may include providing at least one light beam; and setting a time base of a processor configured to control the at least one light beam as a function of a deflection of the at least one light beam.