Holographic Display Optical Modulation Device Amplitude Phase Separation
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Solution Overview
Problem
Current holographic display technologies rely on either amplitude or phase modulators, requiring additional encoding or iterative algorithms to achieve both amplitude and phase modulation, which affects optical efficiency and resolution.
Innovation Solution
An optical modulation device comprising an amplitude modulator and a phase modulator, along with an optical scanning assembly, that decomposes complex amplitude information of a digital hologram into amplitude and phase information, allowing for simultaneous amplitude and phase modulation of a light beam, thereby enabling high-resolution holographic display without the need for embedding phase information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a phase type modulator is used for holographic display, then optical efficiency is improved, but the ability to perform amplitude modulation is lost
Solution Approach 1:
The patent divides the complex amplitude information into separate amplitude and phase components, and uses distinct modulators for each component. The amplitude modulator handles amplitude information while the phase modulator handles phase information, allowing each modulator to be optimized for its specific function without compromising the other capability.
2Adaptability or versatility
If an amplitude type modulator is used for holographic display, then amplitude modulation capability is maintained, but additional encoding technology is required which increases device complexity
Solution Approach 1:
The patent segments the modulation function into two independent parts: amplitude modulation handled by an amplitude modulator and phase modulation handled by a phase modulator. This eliminates the need for encoding phase information into amplitude patterns, thereby reducing computational complexity and algorithm requirements while maintaining both modulation capabilities.
3Use of energy by moving object
If only phase modulation is performed, then optical efficiency is improved, but resolution is compromised due to iterative algorithm requirements
Solution Approach 1:
By separating amplitude and phase modulation into independent modulators, the patent allows direct control of both parameters without requiring iterative algorithms. The amplitude modulator directly modulates light intensity while the phase modulator directly modulates light phase, achieving high resolution through direct modulation rather than iterative computation.
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 high-resolution holographic display with improved optical efficiency, reducing computing resources required and avoiding issues like diffraction efficiency and stray light, while allowing for smaller and cost-effective device design.
Implementation Method 1
an amplitude modulator, configured to perform amplitude modulation of the light beam based on amplitude information in complex amplitude information of each pixel of a digital hologram
Implementation Method 2
a phase modulator, configured to perform phase modulation of the light beam based on phase information in the complex amplitude information
Implementation Method 3
an optical scanning assembly, configured to scan the light beam within a predetermined range
Data Source
AI summary
The present disclosure provides an optical modulation device, an optical modulation method and a holographic display apparatus. The optical modulation device is configured to perform optical modulation of a light beam and comprising: an amplitude modulator, configured to perform amplitude modulation of the light beam based on amplitude information in complex amplitude information of each pixel of a digital hologram; an optical scanning assembly, configured to scan the light beam within a predetermined range; a phase modulator, configured to perform phase modulation of the light beam based on phase information in the complex amplitude information.