Scanning Projector Vertical Resolution via Dual Frame Driving
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Solution Overview
Problem
Conventional scanning projector display devices, such as MEMS type projectors, suffer from reduced vertical resolution on the left and right sides of the image due to continuous scan beams changing direction, resulting in half the original vertical resolution on these sides.
Innovation Solution
A dual frame driving scheme is implemented, where one frame is scanned starting at the first line level and the next frame is scanned starting at a vertically offset line level, allowing the scan beam to fill the gaps between original scan lines, thereby improving overall vertical resolution by interpolating and/or decimating spatial images.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a continuous scan beam is used to scan images back and forth, then the scanning process is simple and efficient, but the vertical resolution on the left and right sides of the image is reduced to half
Solution Approach 1:
The patent segments the scanning process into two distinct phases: a first scanning phase that scans from left to right starting at a first vertical level, and a second scanning phase that scans from right to left starting at a second vertical level. This segmentation allows the scan beam to cover different vertical levels in different phases, thereby improving vertical resolution at the left and right sides of the image while maintaining scanning efficiency.
Solution Approach 2:
The patent introduces a vertical offset between the two scanning phases, effectively adding a dimensional variation to the scanning pattern. By alternating between starting at a first vertical level and a second vertical level (which are offset from each other), the system achieves better vertical coverage without sacrificing horizontal scanning efficiency.
2Stability of the object's composition
If the scan beam changes direction continuously, then the scanning motion is smooth, but vertical spacing gaps are created that are never scanned
Solution Approach 1:
The patent performs preliminary actions by pre-defining two different vertical starting levels (first vertical level and second vertical level) for the scanning phases. This preliminary setup ensures that when the scan beam changes direction, it starts from an offset vertical position, thereby filling the gaps that would otherwise remain unscanned and maintaining continuous coverage.
3Device complexity
If a single scanning pattern is used for all frames, then the control is simple, but vertical resolution is halved on the sides
Solution Approach 1:
The patent introduces dynamic variation to the scanning control by alternating between two different scanning patterns: one starting at a first vertical level and another starting at a second vertical level. This dynamic switching is controlled by a control signal that varies between first and second states, allowing the system to adapt the scanning pattern to achieve full vertical resolution while maintaining relatively simple control logic.
Data Source
AI summary
Methods, systems and devices described herein improve vertical resolution at sides of a four cornered image produced by a scanning projector display device. In accordance with an embodiment, a first plurality of frames (e.g., odd frames) of the image are scanned back and forth from side to side starting at a first line level, in one of the corners. Additionally, a second plurality of frames (e.g., even frames) of the image are scanned back and forth from side to side, starting at a vertical offset level from the first line level, in the same one of the corners. The scanning of the first plurality of frames (e.g., the odd frames) is interleaved with the scanning of the second plurality of frames (e.g., the even frames).