MEMS Scanning Mirror Control for Moire-Free Image Projection
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Solution Overview
Problem
The raster scanning method in micro-electro-mechanical scanning mirrors results in periodic moire patterns that degrade the visual experience of projected images.
Innovation Solution
Scanning the to-be-scanned image in at least two different directions using a target scanning manner with distinct initial locations for each direction, such as a first and second scanning manner, to compensate for areas that cannot be scanned in one direction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If raster scanning manner is used, then scanning simplicity is maintained, but moire patterns appear in projected images
Solution Approach 1:
The patent divides the scanning process into multiple independent scanning directions (first scanning direction and second scanning direction) with different initial locations. Each scanning direction covers specific areas of the image, and by segmenting the scanning task across multiple directions, the patent eliminates the periodic moire patterns that occur in single-direction raster scanning while maintaining operational simplicity through systematic control signals.
2Device complexity
If single-direction scanning is used, then device complexity is reduced, but areas cannot be fully scanned resulting in dark patterns
Solution Approach 1:
The patent introduces an additional dimension to the scanning process by implementing multiple scanning directions (e.g., horizontal and vertical directions) instead of relying on a single scanning direction. This dimensional expansion ensures that all areas of the projected image are fully scanned, eliminating dark patterns while the control system manages the increased complexity through coordinated control signals for each direction.
Data Source
AI summary
This disclosure provides micro-electro-mechanical scanning mirror control methods, control apparatuses, and systems. One example control method includes generating a control signal, where the control signal is used to control a micro-electro-mechanical scanning mirror to project, in a target scanning manner, lasers corresponding to pixels in a to-be-scanned image, to output a projected image of the to-be-scanned image. The target scanning manner includes a first scanning manner and a second scanning manner, and the first scanning manner and the second scanning manner have different initial locations in the to-be-scanned image. The control signal is sent to the micro-electro-mechanical scanning mirror. The to-be-scanned image is scanned in the first scanning manner and the second scanning manner, that is, from at least two different directions.