Coherent Fiber Bundle Display Layout for Brightness Without Heat Load
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Solution Overview
Problem
Existing display technologies for augmented and virtual reality head-mounted devices require high electrical power to achieve high brightness, leading to complex heat and electromagnetic interference management, which increases weight and size, and existing waveguides have low coupling efficiency and brightness throughput.
Innovation Solution
The use of a coherent fiber bundle (CFB) to remotely couple a bright image source to a waveguide and collimating optics, allowing for efficient heat and electromagnetic interference management, and enabling a smaller, lighter, and brighter display by decoupling the image source from the waveguide and collimating optics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If high electrical power is used to drive the image source to achieve high brightness, then the display brightness is improved, but the heat management complexity and weight of the display assembly increase
Solution Approach 1:
The system divides the display assembly into separate functional modules: the image source is positioned in a first location, the waveguide in a second location, and they are coupled through a coherent fiber bundle. This segmentation allows the heavy heat management components to be separated from the waveguide, reducing the weight and thermal signature at the display location while maintaining high brightness performance.
Solution Approach 2:
A coherent fiber bundle acts as an intermediary to transmit light from the image source to the waveguide. This mediator enables the decoupling of the high-power image source from the sensitive waveguide, allowing bright image generation without directly heating the waveguide assembly, thus reducing weight and thermal management complexity.
2Illumination intensity
If the image source is coupled directly to the waveguide to achieve high brightness, then the illumination intensity is improved, but the thermal signature and electromagnetic interference increase
Solution Approach 1:
The coherent fiber bundle serves as an optical intermediary that transmits light energy from the image source to the waveguide without direct thermal or electromagnetic coupling. This isolation prevents heat and electromagnetic interference from the high-power image source from affecting the waveguide, reducing the thermal signature while maintaining high brightness throughput.
Solution Approach 2:
The harmful thermal and electromagnetic effects are extracted from the waveguide assembly by positioning the image source separately and coupling them only optically through the fiber bundle. This extraction removes the heat management burden from the display location while preserving the brightness performance.
3Productivity
If the image source is positioned close to the waveguide to improve coupling efficiency, then the brightness throughput is improved, but the weight distribution and thermal management become problematic
Solution Approach 1:
The coherent fiber bundle maintains efficient optical coupling between the image source and waveguide while allowing physical separation. This intermediary preserves the coupling efficiency needed for high brightness throughput while enabling the image source to be positioned away from the waveguide, improving thermal management and weight distribution.
4Volume of moving object
If a compact display design is used to reduce size, then the volume is reduced, but the heat management and weight distribution become more difficult
Solution Approach 1:
The compact display design segments the thermal management functions from the optical path. The coherent fiber bundle enables a compact overall form factor while allowing the image source to be positioned in a location optimized for heat dissipation, separating the compact display volume from the thermal management requirements.
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 configuration achieves a high luminance display with improved weight distribution and reduced thermal and electromagnetic signatures, providing a more efficient and compact head-mounted display solution.
Implementation Method 1
a coherent fiber bundle (CFB) that is positioned between and coupled to (i) the waveguide and the collimating optics
Implementation Method 2
a collimating optics module arranged at a second side of the display apparatus... The light rays emitting from each pixel of the image source are received and collimated into parallel rays
Data Source
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AI summary
A display apparatus is provided. The display apparatus includes a waveguide and a collimating optics that are positioned at a first side of the display apparatus and coupled to each other. The display apparatus includes an image source and a collimating optics module arranged at a second side of the display apparatus. The second side of the display apparatus is different from the first side of the display apparatus. The display apparatus includes a coherent fiber bundle (CFB) that is positioned between and coupled to (i) the waveguide and the collimating optics and (ii) the image source and the collimating optics module.