LCOS Phase Modulation Accuracy via Median-Average Alignment
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Solution Overview
Problem
Conventional technologies fail to consistently improve phase modulation accuracy in spatial light modulators due to alignment failures like disclination, which reduce the intended phase modulation amount and accuracy.
Innovation Solution
An information processing device with an adjustment unit that shifts the phase distribution range of light passing through a phase modulation element to align the median value of the phase-modulatable range with the average value of the phase distribution range, thereby minimizing differences and enhancing phase modulation accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the display signal level is changed according to the spatial frequency of the pattern, then disclination correction is attempted, but phase modulation accuracy cannot always be improved
Solution Approach 1:
The invention changes the parameter being adjusted from display signal level (conventional approach) to phase distribution range position (novel approach). By shifting the phase distribution range within the phase-modulatable range to align its average value with the median value, the patent achieves more reliable and consistent phase modulation accuracy improvement across different spatial frequency patterns.
2Manufacturing precision
If disclination occurs due to misalignment of liquid crystal molecules, then phase modulation amount decreases, but conventional correction methods do not consistently improve accuracy
Solution Approach 1:
The invention converts the harmful effect of disclination (phase modulation degradation) into a benefit by identifying and compensating for the specific phase distribution characteristics caused by disclination. By measuring the actual phase distribution and shifting it to align with the median value, the system recovers and improves phase modulation accuracy despite the presence of alignment failures.
3Loss of information
If the phase distribution range is not aligned with the phase-modulatable range, then phase information is lost, but misalignment is difficult to detect and correct with conventional methods
Solution Approach 1:
The invention implements a feedback mechanism by measuring the actual phase distribution of light passing through the phase modulation element and using this measurement to determine the appropriate shift amount. The system continuously monitors the phase distribution and adjusts the range position to maintain optimal alignment, thereby minimizing phase information loss in a closed-loop control system.
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 effectively suppresses the loss of phase information and improves phase modulation accuracy, leading to enhanced image quality by ensuring the phase distribution range remains within the modulatable range, thus maintaining or increasing the amount of phase information.
Implementation Method 1
a spatial light modulator using a liquid crystal on silicon (LCOS) (registered trademark) technology modulates light with a parallel-aligned nematic liquid crystal layer in a LCOS (registered trademark) chip, it is possible to modulate only the phase of light
Implementation Method 2
an element that modulates spatial distribution (hereinafter, also referred to as phase distribution) of the phase of light will be referred to as a phase modulation element
Data Source
AI summary
An information processing device (100) includes an adjustment unit (123) that shifts a phase distribution range of light passing through a phase modulation element with respect to a phase-modulatable range of the phase modulation element in such a way that a difference between a median value of the phase-modulatable range and an average value of the phase distribution range becomes small.