Retinal Scanning Display With Large-Beam Eye-Movement Compensation
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Solution Overview
Problem
Existing retinal scanning display devices are bulky, uncomfortable, and prone to generating misinformation due to eye movement, which poses risks in applications requiring precision, such as vehicle piloting.
Innovation Solution
A retinal scanning display device with a light source generating intensity-modulated light, an optic device transforming it into a collimated beam, a scanning component scanning over two axes, and a reflective combiner directing the beam onto the retina, ensuring a larger beam diameter and coordinated intensity modulation to present a true image.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If a small pupil is used in retinal scanning display devices, then the device can be more compact, but the image generated on the retina moves when the eye moves, leading to precision problems
Solution Approach 1:
The patent changes the beam diameter parameter from small (typical) to large (greater than 3mm, preferably greater than 10mm). This parameter change ensures that the beam covers a larger area of the retina, so that even when the eye moves, the beam continues to illuminate the intended retinal region, maintaining image precision while allowing for eye movements
2Measurement precision
If the beam diameter is increased to greater than 3mm, then the image precision is improved and eye movement is compensated, but the device becomes more complex
Solution Approach 1:
The patent employs a reflective combiner that serves multiple functions: it reflects the scanned beams onto the eye, and simultaneously acts as a beam expander to achieve the large beam diameter. This multi-functionality reduces the number of separate optical components needed, thereby reducing device complexity while maintaining the precision benefits of a large beam
3Ease of manufacture
If typical retinal scanning display devices are used, then the basic imaging function is achieved, but they present misinformation due to eye movement and generate discomfort
Solution Approach 1:
The patent incorporates eye tracking to monitor eye position and movement in real-time. This feedback information is used to dynamically adjust the beam scanning pattern and positioning, ensuring that the beam continuously targets the correct retinal region even as the eye moves. This feedback mechanism eliminates misinformation and maintains image accuracy throughout the display period
4Measurement precision
If a large beam diameter is used, then eye movement is compensated and image accuracy is improved, but the light source and optical components require higher precision
Solution Approach 1:
The patent uses a collimated beam from the light source that is pre-formed before scanning. The beam is collimated to a large diameter (greater than 3mm) in advance, so that when it is scanned across the retina, it maintains its large diameter and covers the intended area. This preliminary collimation action simplifies the subsequent scanning and reduces the precision requirements of the scanning components
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 device provides a lightweight, comfortable, and accurate image presentation, reducing the risk of misinformation and eye strain, even with eye movement, by using a larger beam diameter and coordinated intensity modulation.
Implementation Method 1
a light source configured to generate intensity modulated light
Implementation Method 2
an optic device for transforming the intensity modulated light into a beam of collimated light
Implementation Method 3
a scanning component configured to receive the beam, scan the beam over at least two axes, and thereby output a series of scanned beams each having one of a plurality of an output angles
Implementation Method 4
a reflective combiner arranged to reflect the scanned beams onto the eye over the range of output angles
Implementation Method 5
whereupon the eye may focus the beam onto a portion of the retina in dependence on the output angle
Data Source
AI summary
A retina scanning display device (300) configured to provide an image to a retina of an eye (304) of a user, the device comprising: a light source (302) configured to generate intensity modulated light; an optic device (306) for transforming the intensity modulated light into a beam of collimated light; a scanning component (308) configured to receive the beam, scan the beam over at least two axes, and thereby output a series of scanned beams each having one of a plurality of an output angles; and a reflective combiner (320) arranged to reflect the scanned beams onto the eye over the range of output angles, whereupon the eye may focus the beam onto a portion of the retina in dependence on the output angle; wherein the beam has a predetermined diameter (d) greater than 3 mm.