Laser Projection Device Reflector Starting Point Shift
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Solution Overview
Problem
Conventional laser projection devices face challenges in achieving uniform illumination of the projection surface due to unilluminated regions between consecutive images, which affects the brightness and visual quality of the displayed image.
Innovation Solution
A laser projection device with linearly movable and sinusoidally movable reflector elements, controlled by a regulating unit to shift the starting point of the linear reflector element's movement between consecutive images, ensuring uniform illumination by adjusting the position of the laser beam to overlap unilluminated regions, and synchronizing image reconstruction to maintain correct image representation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the laser beam scans line by line to reproduce images, then the projection device can generate complete images, but unilluminated regions appear between consecutive images causing non-uniform illumination
Solution Approach 1:
The patent introduces an asymmetric offset between the starting points of consecutive image sequences. Instead of resetting to the same starting position, the starting point is shifted by a predetermined offset amount, causing laser beams from different sequences to illuminate different regions. This asymmetric positioning ensures complete coverage and uniform illumination across the projection surface.
Solution Approach 2:
The patent adds a temporal dimension to the spatial scanning pattern by varying the starting position across different time sequences. Multiple image sequences are projected with different starting offsets, effectively using time as an additional dimension to achieve complete spatial coverage that a single static scanning pattern cannot provide.
2Illumination intensity
If the starting point of the linear reflector element is shifted between consecutive images, then uniform illumination is achieved, but the image reconstruction must be synchronized to maintain correct representation
Solution Approach 1:
The control unit monitors the starting positions of multiple image sequences and dynamically adjusts them to maintain the predetermined offset relationship. This feedback mechanism ensures that even if timing drift or mechanical variations occur, the offset positioning is maintained, preserving both uniform illumination and correct image reconstruction.
Solution Approach 2:
The system transitions from static, fixed starting positions to dynamic, adjustable starting positions. The control unit can modify the starting position of each image sequence in real-time, allowing the system to adapt to varying conditions while maintaining the offset relationship necessary for uniform illumination.
3Area of stationary object
If multiple image sequences are projected with different starting positions, then coverage of the projection surface is improved, but the precision of image reconstruction must be maintained
Solution Approach 1:
The predetermined offset between starting positions is calculated and established in advance before projection begins. This preliminary configuration ensures that multiple image sequences will cover the entire projection surface without gaps, while the control unit pre-synchronizes the timing to maintain accurate image reconstruction throughout the projection process.
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 uniform illumination and correct image reproduction on the projection surface, minimizing unilluminated regions and maintaining a smooth visual experience, even at high frame rates.
Implementation Method 1
at least one first reflector element...movable about a first axis perpendicular to a second axis of the second reflector element...configured to deflect the laser beam in a vertical direction
Implementation Method 2
at least one second reflector element...movable about a second axis...configured to deflect the laser beam in a horizontal direction
Data Source
AI summary
A laser projection device includes at least one first reflector element, which is linearly movable. A period of the at least one first reflector element corresponds to a period of time for reproducing a single. The laser projection device includes at least one second reflector element, which is movable in a sinusoidal manner, a semiperiod of a sine corresponding to one line. The at least one first reflector element and the at least one second reflector element are movable about two axes at least substantially perpendicular to each other. The laser projection device includes at least one control and/or regulating unit, which is configured to control and/or regulate the at least one first reflector element.