Collection Optics for Disparity Sensing in AR Waveguides
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Solution Overview
Problem
Display systems, such as AR-based head-mounted devices, face issues with image misalignment due to manufacturing errors or projector-waveguide misalignment, leading to poor visual acuity and discomfort for users, and require additional components for disparity sensing, which increases system size and complexity.
Innovation Solution
Incorporating collection optics that direct light from waveguides to a disparity sensing detector, allowing for the detection and correction of image misalignment without the need for a dedicated source of display information, thereby reducing system size and eliminating interference between display and disparity sensing paths.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a dedicated source of display information is added for disparity sensing, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The waveguide is designed to serve dual functions: it acts as both a display medium for presenting images to the user and as a light delivery path for disparity sensing. By extracting unused light that would otherwise be wasted during display operation, the system achieves disparity detection without requiring a dedicated sensing light source, thereby maintaining measurement precision while reducing device complexity
Solution Approach 2:
The display system's own light output is utilized for disparity sensing purposes. The waveguide's inherent light transmission during normal display operation provides the necessary illumination for the disparity sensing detector, allowing the system to sense alignment errors using its own operational light rather than requiring external or separate sensing infrastructure
2Measurement precision
If additional components are added for disparity sensing, then measurement precision is improved, but manufacturing precision requirements increase
Solution Approach 1:
The system extracts and utilizes the unused light already present in the waveguide during normal display operation. By taking out this otherwise wasted light resource and directing it to the disparity sensing detector, the system achieves precise image misalignment detection without adding components that would require tight manufacturing tolerances for alignment
Solution Approach 2:
The waveguide serves dual purposes as both display medium and sensing light delivery path. This multi-functionality eliminates the need for separate dedicated sensing components that would require precise alignment with the display path, thereby reducing manufacturing precision requirements while maintaining the ability to detect image misalignment
3Measurement precision
If collection optics are added to direct light to disparity sensing detector, then measurement precision is improved, but device complexity increases
Solution Approach 1:
Collection optics serve as an intermediary element that efficiently couples the unused light from the waveguide to the disparity sensing detector. These optics mediate between the display light path and the sensing detector, enabling accurate light detection while maintaining a relatively simple overall system architecture by using a single dedicated sensing path rather than duplicating the entire display optical train
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 detection and correction of image misalignment, improving user experience by maintaining image quality and reducing system size, while eliminating the need for additional manufacturing steps and components.
Implementation Method 1
collection optics to direct light from waveguides to a disparity sensing detector
Implementation Method 2
collection optics to direct light from waveguides to a disparity sensing detector
Implementation Method 3
first projector and a second projector to direct light associated with a first image and a second image, respectively, through one or more intermediary optical components at each respective lens
Data Source
AI summary
According to examples, a display system may include a disparity sensing detector, collection optics, and a first lens assembly. The first lens assembly may include a first projector to output a first display light associated with a first image and a first waveguide for propagating the first display light to the collection optics, in which the collection optics is to direct the first display light to the disparity sensing detector. The display system may also include a second lens assembly including a second projector to output a second display light associated with a second image and a second waveguide for propagating the second display light to the collection optics, in which the collection optics is to direct the second display light to the disparity sensing detector.