Laser Projection Trajectory Control for Flicker-Free Low Power
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Solution Overview
Problem
Laser projection systems in portable devices face challenges in optimizing power consumption while maintaining flicker-free projection quality, as increasing refresh rates beyond a certain threshold does not improve projection quality but significantly increases power usage.
Innovation Solution
A laser projection device with a trajectory control module that optimizes angular acceleration and velocity to maintain a refresh rate above the flicker fusion threshold, minimizing power consumption by dynamically controlling the power amplifier and galvanometer operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the refresh rate of the laser projection is increased above the perceivable threshold, then the projection quality is maintained, but unnecessary power is wasted
Solution Approach 1:
The system dynamically adjusts the refresh rate parameter based on the specific trajectory and acceleration requirements. By calculating optimal parameters for each projection trajectory, the system maintains the minimum necessary refresh rate above the flicker fusion threshold without unnecessarily increasing it, thereby reducing power consumption while preserving projection quality
Solution Approach 2:
The refresh rate is made dynamic rather than fixed. The trajectory control module continuously calculates and adjusts the refresh rate based on real-time trajectory parameters, acceleration requirements, and power consumption considerations. This dynamic adaptation allows the system to use the minimum necessary refresh rate for each situation, avoiding wasteful power consumption while maintaining flicker-free projection
2Use of energy by moving object
If the refresh rate is reduced to save power, then power consumption decreases, but projection quality may deteriorate below acceptable thresholds
Solution Approach 1:
The system incorporates feedback mechanisms that monitor projection quality metrics and power consumption levels. The trajectory control module uses this feedback to continuously optimize the refresh rate, ensuring it remains above the flicker fusion threshold while minimizing power consumption. This closed-loop control prevents quality deterioration by adjusting parameters based on actual system performance and environmental conditions
3Duration of action of moving object
If trajectory optimization is implemented to reduce power consumption, then operational duration is extended, but system complexity increases
Solution Approach 1:
The system performs preliminary calculations of optimal trajectory parameters and refresh rates before executing the projection. By pre-calculating the necessary parameters based on the desired projection path and power constraints, the system avoids the need for complex real-time adjustments during operation, thereby extending operational duration while limiting the increase in system complexity to the calculation phase
Data Source
AI summary
Provided are embodiments for a laser projection device configured to perform trajectory optimization. The device includes a power source configured to supply power to a power amplifier; a laser projector configured to emit a laser beam towards a surface of an object; a trajectory control module configured to calculate one or more parameters for a projection trajectory of the laser beam; a beam steering unit configured to control a direction of the laser beam; and wherein the power amplifier is operably coupled to the beam steering unit, wherein the output of the power amplifier is based at least in part on the calculated one or more parameters. Also provided are embodiments for a method of operating a laser projection device configured to perform trajectory optimization.