Optical Module Alignment Using Mirror Lookup Compensation
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Solution Overview
Problem
Existing optical modules for AR and VR glasses face challenges in adjusting the optical axis of laser light after manufacturing, leading to complications in mounting and a decrease in image quality due to shifts in projection positions of laser light colors on the image display surface.
Innovation Solution
An optical module with laser light emitting elements and an optical scanning mirror mounted on separate substrates, allowing for optical axis adjustment, using a lookup table to control the mirror's swing position and laser intensity to compensate for projection shifts, and integrating these components via a metal bonding layer for precise alignment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the laser light emitting element and the mirror are mounted on one common substrate with the mirror fixed to an inclined surface, then the device structure is simplified and manufacturing is easier, but the optical axis position cannot be adjusted after manufacturing and the projection positions of different laser colors shift
Solution Approach 1:
The patent divides the optical module into separate substrates: one substrate for mounting the laser light emitting element and another substrate for mounting the mirror. This segmentation allows independent positioning and adjustment of each component, enabling optical axis alignment to be optimized separately for each element while maintaining ease of manufacturing through modular assembly.
2Adaptability or versatility
If multiple laser light emitting elements are used with different relative positions to the mirror, then the device can emit multiple colors, but the projection positions of each color shift on the image display surface reducing image sharpness
Solution Approach 1:
The patent introduces a control system that dynamically adjusts the swing position of the mirror and the intensity of each laser light emitting element based on a lookup table. This dynamic adjustment compensates for the different relative positions of multiple laser elements, ensuring that all colors are projected onto the same position on the image display surface, thereby maintaining image sharpness while enabling multi-color emission.
3Volume of moving object
If the optical module is miniaturized for wearable devices, then the device size is reduced, but the adjustment of mounting position becomes more complicated and image quality decreases due to projection shifts
Solution Approach 1:
The patent pre-calculates and stores the optimal swing positions and laser intensities for each color in a lookup table during the design phase. This preliminary action eliminates the need for complex real-time adjustments during mounting or operation, allowing the miniaturized optical module to achieve precise optical axis alignment and compensate for projection shifts through pre-programmed control parameters.
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
Enables accurate optical axis alignment and compensation for projection shifts, improving image quality by ensuring precise focusing of laser lights onto the image display surface, even in miniaturized wearable devices.
Implementation Method 1
a mirror part provided with an optical scanning mirror element on a main surface of a second substrate that is integrated with the first substrate
Implementation Method 2
a laser light source part provided with a plurality of laser light emitting elements on a main surface of a first substrate, each of the laser light emitting elements being configured to emit each of a plurality of laser lights having different peak wavelengths
Data Source
AI summary
An optical module for displaying an image: a laser light source part with laser light emitting elements emitting laser lights having different peak wavelengths; a mirror part with an optical scanning mirror element on a second substrate integrated with the first substrate; a laser drive control part individually and independently controlling an intensity of laser light from the laser light emitting elements; a mirror drive control part controlling swinging of the optical scanning mirror element; a memory storing a lookup table that is an array of correspondence relations between each swing position of the optical scanning mirror element and a projection position of laser light from the laser light emitting elements on the image display surface; and a system control part controlling the laser drive control part and the mirror drive control part so as to control the mirror drive control part based on the lookup table.