Holographic Projection System Runtime Optical Alignment
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Solution Overview
Problem
Existing holographic projection systems face challenges in maintaining optical alignment during runtime, especially when there are changes in the tilt of the display device, which can affect the viewing experience.
Innovation Solution
The system performs an optical alignment process that compensates for misalignments at a sub-pixel level by directly quantifying the optical misalignment and adjusting the holographic reconstruction accordingly, without adversely affecting the viewing experience.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If optical alignment process is performed during runtime to compensate for display device tilt, then alignment accuracy is improved, but viewing experience is adversely affected
Solution Approach 1:
The optical alignment process is segmented into two distinct phases: a calibration phase performed before runtime to establish baseline alignment, and a runtime phase where only minimal adjustments are made. This segmentation allows the system to achieve high alignment accuracy without disrupting the viewing experience during normal operation, as the majority of alignment work is completed in advance.
Solution Approach 2:
The system performs preliminary optical alignment and calibration actions before the holographic projection system enters runtime. This preliminary action establishes the initial alignment state and allows the runtime operation to proceed without frequent realignment operations that would disrupt viewing. The preliminary calibration includes characterizing the relationship between display device tilt and holographic reconstruction position.
2Stability of the object's composition
If repeated optical alignment is performed during runtime, then alignment stability is improved, but system productivity is reduced
Solution Approach 1:
The optical alignment process is implemented as a periodic calibration routine rather than a continuous operation. The system performs alignment checks and adjustments at predetermined intervals during runtime, establishing a periodic action that maintains alignment stability without requiring constant intervention. This periodic approach balances alignment stability with system productivity by limiting alignment operations to specific moments when viewing disruption is acceptable.
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 approach allows for repeated optical alignment during runtime, ensuring minimal disruption to the viewing experience and achieving sub-pixel alignment accuracy.
Implementation Method 1
Light modulation may be achieved using electrically-addressable liquid crystals, optically-addressable liquid crystals or micro-mirrors, for example.
Implementation Method 2
Light scattered from an object contains both amplitude and phase information. This amplitude and phase information can be captured on, for example, a photosensitive plate by well-known interference techniques to form a holographic recording, or 'hologram'
Implementation Method 3
The hologram may be reconstructed by illumination with suitable light to form a two-dimensional or three-dimensional holographic reconstruction, or replay image, representative of the original object.
Data Source
AI summary
A holographic projection system includes a detector arrangement arranged to detect light received by a first detection area. The system is arranged to perform an optical alignment process including selecting a first pixel of an array of pixels; forming a first holographic reconstruction of a first picture; moving the first holographic reconstructionin a first dimension of a replay plane such that the first holographic reconstruction is moved between a plurality of positions; and determining a value for a parameter of the light received by the first detection area in each of the plurality of positions and comparing each respective determined parameter value to a threshold condition. If the threshold condition is not met, the holographic projection system is arranged to repeat the optical alignment process by: selecting a second pixel of the array of pixels; and forming a second holographic reconstruction of a second picture.