Retinal Projection Device Chromatic Aberration Correction
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Solution Overview
Problem
Chromatic aberration occurs in near-eye wearable devices due to the wavelength-dependent reflection angle of light in nanostructured surfaces, leading to image distortion.
Innovation Solution
A retinal projection device with a movable mirror and an adjustment unit comprising spectroscopic devices that adjust the incident angles of red, green, and blue light to ensure they are reflected in the same direction, using metalens or diffractive lenses to correct for wavelength-dependent refraction and reflection.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a nanostructured surface (meta-optics mirror) or diffractive mirror is used as a reflector, then the device can achieve compact near-eye display functionality, but chromatic aberration occurs because the reflection angle changes depending on the wavelength of light
Solution Approach 1:
The patent segments the light path by introducing a beam splitter that separates different wavelength components (red, green, blue light) and directs them through different optical paths. This allows each wavelength to be independently controlled to compensate for the wavelength-dependent reflection characteristics of the nanostructured surface, thereby reducing chromatic aberration while maintaining device compactness.
Solution Approach 2:
The patent introduces a beam splitter as an intermediary component between the light source and the nanostructured reflector. This intermediary device enables wavelength-specific optical path control, allowing the system to compensate for chromatic aberration caused by the reflector's wavelength-dependent reflection angle while preserving the compact form factor enabled by the nanostructured surface.
2Manufacturing precision
If the reflection angle is made wavelength-independent, then chromatic aberration is reduced, but the optical path length and device complexity increase
Solution Approach 1:
The optical system is segmented into wavelength-specific paths using a beam splitter, allowing independent optimization for each color channel. This segmentation enables chromatic aberration reduction through wavelength-specific optical path control while keeping the overall device complexity manageable by processing only one wavelength at a time through the movable mirror.
Solution Approach 2:
The patent employs a movable mirror that dynamically adjusts the optical path for each wavelength component. By sequentially directing different wavelength components through the movable mirror and using the beam splitter to manage their paths, the system achieves chromatic aberration compensation with controlled complexity rather than requiring all wavelengths to be processed simultaneously through complex static optics.
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
Reduces chromatic aberration by ensuring that red, green, and blue light corresponding to one pixel are reflected in the same direction, improving image quality in near-eye wearable devices.
Implementation Method 1
the first spectroscopic device and the second spectroscopic device in which refraction angles change depending on a wavelength of the laser light
Implementation Method 2
a reflector that projects an image onto a retina of a user wearing the near-eye wearable device by reflecting the laser light having passed through the movable mirror and irradiating the retina with reflected light
Data Source
AI summary
A retinal projection device includes: a light source that emits laser light containing at least one of red light, green light, and blue light; a movable mirror that performs scanning with the laser light; a reflector that projects an image onto a retina of a user wearing a near-eye wearable device by reflecting the laser light having passed through the movable mirror and irradiating the retina with reflected light; and an adjustment unit that is provided between the movable mirror and the reflector, and causes the red light, the green light, and the blue light corresponding to one pixel included in the image to be incident on the reflector at incident angles different from each other such that the red light, the green light, and the blue light corresponding to the one pixel are reflected in a same direction by the reflector.