Nonlinear Scanning Projector for Motion Artifact Reduction
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Biresonant scanning in scanning projectors results in nonlinear scanning trajectories, leading to image artifacts such as splitting, shearing, banding, and distortion, especially when viewer's eyes or displayed objects move, which are distracting and uncomfortable for the user.
Innovation Solution
Implement nonlinear scanning, such as biresonant Lissajous scanning, with controlled scanning timing, directionality, and brightness variation to ensure consecutive scans provide conterminous image portions, maintaining high local angular rates and minimizing interlacing, thus reducing motion-caused artifacts.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If biresonant scanning is used to achieve energy efficiency, then energy consumption is reduced, but image artifacts such as splitting, shearing, banding, and distortion occur
Solution Approach 1:
The system pre-calculates and stores the optimal sequential scan pattern that covers the entire field of view before actual scanning begins. This preliminary planning ensures that the nonlinear biresonant scanning trajectory is optimized in advance to minimize artifacts while maintaining energy efficiency, resolving the contradiction between energy savings and image quality.
Solution Approach 2:
The scanning system dynamically adjusts the scanning parameters and trajectory during operation based on real-time feedback. The beam scanner modifies its scanning path and timing to maintain conterminous image portions while utilizing biresonant frequencies, thereby reducing artifacts while preserving energy efficiency through adaptive control.
2Use of energy by stationary object
If nonlinear scanning trajectories are used to maintain energy efficiency, then power consumption is reduced, but image stability deteriorates when viewer's eyes or displayed objects move
Solution Approach 1:
The system incorporates feedback mechanisms that monitor the scanning process and detect any deviations or artifacts in real-time. Based on this feedback, the control system adjusts the scanning parameters and timing to maintain image stability even when the viewer's eyes or displayed objects move, while continuing to operate at energy-efficient biresonant frequencies.
Solution Approach 2:
The system dynamically changes scanning parameters such as frequency, amplitude, and phase during operation to optimize image stability. By adjusting these parameters in response to detected motion or artifacts, the system maintains stable images while preserving the energy efficiency benefits of nonlinear scanning trajectories.
3Stability of the object's composition
If conventional linear raster scanning is used to achieve image stability, then image quality is maintained, but energy consumption increases
Solution Approach 1:
The system exploits mechanical resonance and vibration at biresonant frequencies to achieve efficient scanning. By operating at these natural resonant frequencies of the beam scanner, the system minimizes the energy required for scanning while maintaining stable and high-quality images through the periodic and predictable nature of resonant oscillations.
Solution Approach 2:
The scanning system employs periodic scanning patterns based on biresonant frequencies, creating regular and predictable scanning trajectories. This periodic action ensures that consecutive scans produce conterminous image portions, maintaining image stability and quality while reducing energy consumption compared to conventional linear raster scanning that operates outside resonant frequencies.
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
The solution achieves cleaner and steadier images with reduced artifacts, approximating linear raster-type scanning while maintaining energy efficiency, providing a comfortable viewing experience.
Implementation Method 1
sinusoidally scan the light beam about first and second non-parallel axes at corresponding resonant frequencies of the beam scanner
Data Source
AI summary
A scanning projector is disclosed, including a light engine for providing a light beam, a beam scanner for scanning the light beam about two axes, and a controller operably coupled to the light engine and the beam scanner and configured to cause the beam scanner to non-linearly scan the light beam about the first and second axes within the field of view while varying brightness of the light beam to provide the image. The nonlinear scanning is performed such that consecutive scans provide conterminous portions of the image. This enables one to increase a local rate of providing the image across at least 75% of an area of the field of view is greater than 1500 degrees per second. The high local rate results in a significant reduction of artifacts caused by motion of displayed object, the users eyes or head, etc.