Micro-Mirror System Offset Compensation for Laser Projection
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Solution Overview
Problem
Micro-mirror actuators face challenges in precise light beam direction due to temperature-dependent zero shifts in piezoresistive sensor output voltages, which are not adequately compensated by existing systems, affecting image quality.
Innovation Solution
Incorporating a compensation routine in the evaluation and control unit that adjusts the offset voltage based on anticipated light intensity from the light source, specifically for RGB lasers, to actively correct both static and dynamic light-dependent offsets in the micro-mirror system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If piezoresistive sensors are used for position detection, then position detection capability is provided, but temperature-dependent zero shifts cause offset voltage changes that reduce measurement precision
Solution Approach 1:
The system uses feedback by continuously monitoring the sensor output voltage and comparing it with expected values based on light intensity data. The control system adjusts the offset voltage dynamically based on this feedback to compensate for temperature-dependent zero shifts and maintain measurement precision.
Solution Approach 2:
The system changes the offset voltage parameter dynamically based on light intensity variations. By adjusting this electrical parameter in response to environmental changes (temperature, light intensity), the system compensates for sensor drift and maintains reliable position detection.
2Measurement precision
If offset voltage compensation is implemented, then measurement precision is improved, but device complexity increases due to additional control routines
Solution Approach 1:
The control system performs multiple functions using the same hardware resources: it controls the micro-mirror actuator, reads sensor data, processes light intensity information, and implements offset compensation. This multi-functionality reduces the need for additional dedicated components, thereby limiting the increase in device complexity.
Solution Approach 2:
The system uses its own existing resources (control unit, light intensity data) to compensate for sensor errors. The control system serves itself by utilizing available information about light intensity to automatically adjust offset voltage, eliminating the need for external calibration equipment or additional sensors.
3Reliability
If light intensity information is used for offset compensation, then reliability is improved, but loss of information occurs due to synchronization requirements between pixel data and light source data
Solution Approach 1:
The system performs preliminary action by using light intensity data that is already available from the image data processing pipeline. The offset compensation is prepared in advance using this pre-existing information, avoiding the need for additional real-time measurements and reducing synchronization requirements.
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 precise position detection and deflection of the micro-mirror, enhancing image quality by synchronizing pixel information with light source intensity data to compensate for light-induced offset variations, thereby improving the accuracy of light beam direction.
Implementation Method 1
position sensors, in particular piezoresistive sensors, are mounted on the micro-mirror element or in close proximity thereto
Implementation Method 2
The motion is brought about by the action of force of electrostatic fields
Data Source
AI summary
A micro-mirror system having a micro-mirror actuator, a sensor for detecting the position of the micro-mirror actuator, a light module having at least one light source and an associated control system via which a light intensity of the light source is controllable, and an evaluation and control unit which is designed to control the micro-mirror actuator as a function of an output signal of the sensor. The system provides that the evaluation and control unit includes a compensation routine in which an offset voltage of the output signal of the sensor is settable as a function of the light intensity of the light source to be expected at the point in time that the micro-mirror actuator is activated.