MEMS Mirror Laser Projector Distortion Correction
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Solution Overview
Problem
Current image projection systems using lasers face distortion issues when the projection angle is not perpendicular, leading to trapezoidal shapes and requiring complex image processing to correct, which can reduce pixel validity and degrade image quality.
Innovation Solution
An image projection apparatus with a laser oscillator, reflective optical elements, and a memory control system that calculates irradiation positions using polynomial coefficients to adjust the oscillation angle of MEMS mirrors, allowing for real-time correction of distortion without reducing pixel validity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If oblique projection is performed, then the projector can be positioned at flexible angles, but the projection image becomes distorted into a trapezoid shape
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the oscillation angles of the MEMS mirrors based on polynomial coefficients that correspond to different projection angles. When oblique projection is detected, the system calculates new oscillation parameters and updates the mirror control to compensate for distortion, allowing the projector to maintain image quality across various projection angles.
2Shape
If image processing is performed to correct distortion, then the projection image shape is improved, but pixel validity is reduced and image quality degrades
Solution Approach 1:
The patent implements dynamics by using a resonant-type MEMS mirror that oscillates at its natural resonance frequency. This dynamic approach allows the mirror to rapidly adjust to different projection angles without requiring complex static image processing. The polynomial-based angle correspondence enables real-time parameter adjustment that preserves all pixels while correcting distortion through optical manipulation rather than digital pixel manipulation.
3Speed
If resonant-type MEMS is used, then the oscillation speed is improved, but the calculation of depiction area becomes more difficult
Solution Approach 1:
The patent applies preliminary action by pre-calculating polynomial coefficients that represent the relationship between projection angles and MEMS oscillation parameters. These coefficients are stored and readily available when projection angle changes occur. This approach eliminates the need for complex real-time calculations during operation, as the system simply retrieves and applies the appropriate pre-computed coefficients corresponding to the detected projection angle.
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 system effectively corrects distortion in real-time, maintaining image quality by adjusting the laser oscillation based on calculated coefficients, ensuring accurate projection without discarding pixels, and supporting high-definition imaging even when tilted.
Implementation Method 1
a deflection part including a reflective optical element and configured to oscillate the reflective optical element with respect to two perpendicularly intersecting axes
Implementation Method 2
an image projection apparatus using a laser as a light source
Data Source
AI summary
An image projection apparatus includes an input part that inputs image data, a frame memory that stores the image data, a laser oscillator that radiates a laser to a screen, a deflection part including a reflective optical element and configured to oscillate the reflective optical element with respect to two perpendicularly intersecting axes, a storage part that stores coefficient data of a polynomial expression, an irradiation position calculating part that calculates an irradiation position based on a coefficient obtained by using the coefficient data and an oscillation angle of the reflective optical element, an address calculating part that calculates an address in the frame memory corresponding to the irradiation position, a memory control part that reads out pixel data of the address, and a laser drive part that oscillates the laser oscillator in accordance with a luminance that corresponds to the pixel data.