Retinal Scanning Optical Engine Pupil Tracking
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Solution Overview
Problem
Conventional retinal scanning display devices face challenges in accurately controlling the optical system to guide laser light to the user's pupils, particularly due to the complexity of combining multiple optical elements, which makes it difficult to regulate the position and focus of the laser light effectively.
Innovation Solution
A retinal scanning display device that includes semiconductor lasers emitting different wavelengths, an optical multiplexer, a beam shaper, a direction-of-emission changer, and a detector to move the optical engine integrally, allowing for precise alignment and focus of the light beam on the user's pupils based on detected pupil positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple optical elements are combined to guide laser light to the user's pupils, then the light guidance function is improved, but the device complexity and control difficulty increase
Solution Approach 1:
The patent combines multiple optical elements (laser diodes, lenses, light guides) into an integrated optical engine assembly that moves as a single unit. This merging approach maintains the light guidance function while reducing the number of separate components that need individual alignment and control, thereby resolving the contradiction between reliability and device complexity.
Solution Approach 2:
The optical engine is designed as a multi-functional unit that simultaneously performs laser emission, beam shaping, and directional control. By making the optical engine universal and multi-functional, the system reduces overall complexity while maintaining reliable light guidance to the user's pupils.
2Manufacturing precision
If the position of optical elements is adjusted to regulate laser light focus, then the focus precision is improved, but the control complexity increases
Solution Approach 1:
By merging the laser diodes, beam shaping elements, and focusing lenses into a single optical engine assembly, the patent eliminates the need for complex independent control of multiple optical elements. The integrated assembly maintains focus precision while significantly simplifying the control mechanism, as the entire assembly can be positioned and focused as one unit rather than requiring coordinated control of multiple separate components.
3Measurement precision
If the optical system is moved to follow pupil position, then the light alignment accuracy is improved, but the mechanical complexity increases
Solution Approach 1:
The patent integrates the optical engine with the pupil detection system, creating a unified assembly that automatically tracks and follows pupil movements. This merging eliminates the need for separate mechanical control systems that would otherwise be required to coordinate the optical elements with pupil position, thereby maintaining high alignment accuracy while reducing mechanical complexity.
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
This solution enables easy guidance of the light beam to the user's pupils, enhancing the control and focus of the optical system, thereby improving the sense of immersion and reducing the complexity of the optical engine's alignment and movement.
Implementation Method 1
an optical multiplexer to which a plurality of the semiconductor lasers are attached, which individually receives the types of laser light having different wavelengths emitted from a plurality of the semiconductor lasers and which combines the types of laser light coaxially with a predetermined optical axis to output the combined laser light
Implementation Method 2
a beam shaper that is provided on an output side of the optical multiplexer and that shapes the combined laser light output from the optical multiplexer into a light beam having a predetermined divergence or convergence angle
Implementation Method 3
a detector that detects the position of the pupil of the user
Data Source
AI summary
A retinal scanning display device including an optical system emits laser light to a pupil of a user, an optical multiplexer individually receives types of laser light having different wavelengths emitted from a plurality of semiconductor lasers, which combines the types of laser light coaxially to output the combined laser light. On the optical multiplexer, a beam shaper shapes the combined laser light into a light beam having a predetermined divergence or convergence angle, and a direction-of-emission changer changes image signal corresponding to an image to be formed, the direction of emission of the light beam output through the beam shaper within at least a plane intersecting the direction of emission. Then, an optical engine formed with the semiconductor lasers, the optical multiplexer, the beam shaper and the direction-of-emission changer guides the laser light emitted from the direction-of-emission changer to the position of the pupil of the user.