Dual Prism Laser Projector Image Distortion Correction
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Solution Overview
Problem
Conventional laser projectors with MEMS scanning mirrors suffer from image distortion and image lift issues, particularly when the projector is placed on a desk or floor, leading to incomplete image projection on the imaging surface, and existing solutions using aspheric components or prisms are costly and difficult to assemble due to high manufacturing complexity and alignment requirements.
Innovation Solution
A laser projector design incorporating a first prism and a second prism arranged in series along the light path from the MEMS mirror to the imaging surface, with specific angles between the prisms to correct image distortion and lift the image, allowing for complete projection on the imaging surface without the need for complex aspheric components or precise assembly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If aspheric components or optical components with aspheric reflecting surfaces are used for correction of image distortion, then image distortion correction is improved, but manufacturing cost and assembly difficulty increase significantly
Solution Approach 1:
The patent divides the image correction function into two separate prisms: one dedicated to image distortion correction and the other to image lift. This segmentation allows each prism to have a simpler, more specialized structure compared to using complex aspheric components, thereby reducing manufacturing difficulty and assembly complexity while maintaining effective correction performance.
Solution Approach 2:
The patent introduces two prisms as intermediary optical elements between the MEMS mirror and the imaging surface. These prisms serve as mediators to achieve image distortion correction and image lift through refraction, avoiding the need for complex aspheric components directly at the imaging surface, thus simplifying the overall system structure and assembly process.
2Device complexity
If a single light spot with two-dimensional scanning is used, then device structure is simplified, but image distortion and image lift problems occur
Solution Approach 1:
The patent introduces two prisms as intermediary optical elements between the simple two-dimensional scanning system and the imaging surface. These prisms correct the image distortion and enable image lift that inherently occurs with simple scanning, thereby maintaining device simplicity while achieving high image quality without requiring complex scanning mechanisms.
Solution Approach 2:
The patent changes the optical parameters (refraction angles, prism positions) to simultaneously achieve image distortion correction and image lift. By carefully selecting and adjusting these parameters, the system maintains a simple two-dimensional scanning structure while producing high-quality corrected images on the imaging surface.
3Manufacturing precision
If prisms are arranged to achieve both image distortion correction and image lift, then image quality is improved, but optical path complexity increases
Solution Approach 1:
The patent utilizes the spatial arrangement of two prisms in specific orientations and positions to achieve both image distortion correction and image lift simultaneously. By configuring the prisms at specific angles and locations within the optical path, the system accomplishes dual correction functions without requiring excessive optical path length, effectively using spatial dimensionality to optimize performance.
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 effectively corrects image distortion and lifts the projected image, ensuring it covers the entire imaging surface while reducing production costs and assembly complexity, thus improving the projector's performance and market competitiveness.
Implementation Method 1
a first prism and a second prism arranged in turn at a light path from a MEMS mirror to an imaging surface, and an angle between the two prisms satisfies specific conditions. Thus the scanned and projected image on the imaging surface are corrected and lifted up.
Data Source
AI summary
A laser projector includes a laser source module for generating an input light beam, a deflection component that deflects the input light beam to mutually orthogonal first and second scanning directions to form a scanning light beam, a first prism and a second prism both used for allowing the scanning light beam to pass therethrough for performing two-dimensional scanning on an imaging surface and formation of an image. By adjustment of the angle between the first prism and the second prism, various conditions are satisfied to achieve image distortion correction and image lift.