Holographic Display Phase Modulation for Binocular Crosstalk
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Solution Overview
Problem
Current holographic display methods face challenges in preventing binocular crosstalk while providing hologram images with different viewpoints to the left and right eyes, leading to increased data processing requirements and viewer fatigue due to limitations in viewpoint resolution and depth perception.
Innovation Solution
A holographic display apparatus and method that utilizes a spatial light modulator and controller to generate and control first and second hologram patterns with different phase modulation values, ensuring that hologram images are formed on distinct spatial locations, thereby preventing binocular crosstalk by alternately scanning or overlapping these patterns to maintain a location difference greater than the observer's pupil size.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a binocular hologram technique is used to provide hologram images to only a viewing zone corresponding to both eyes, then the data processing amount is reduced, but binocular crosstalk occurs between left and right eye viewing zones
Solution Approach 1:
The patent applies local quality by assigning different phase modulation values to different spatial regions (left eye viewing zone and right eye viewing zone). The controller sets a first phase modulation value for the first hologram pattern corresponding to the left eye zone and a second phase modulation value for the second hologram pattern corresponding to the right eye zone. This ensures that each region has optimized local properties to prevent crosstalk while maintaining reduced data processing requirements.
2Manufacturing precision
If hologram images with different viewpoints are provided to left and right eyes, then 3D depth perception is improved, but binocular crosstalk occurs causing viewer fatigue
Solution Approach 1:
The patent changes the phase modulation parameter to prevent binocular crosstalk. The controller sets different phase modulation values (first phase modulation value and second phase modulation value) for the left and right eye hologram patterns respectively. This parameter differentiation ensures that hologram images are formed on different spatial locations, maintaining accurate depth perception while eliminating crosstalk-induced viewer fatigue.
3Manufacturing precision
If a very high resolution spatial light modulator is used to implement perfect holographic display, then image quality is improved, but device complexity and data processing requirements increase significantly
Solution Approach 1:
The patent segments the holographic display into two separate viewing zones: a first viewing zone for the left eye and a second viewing zone for the right eye. By generating and providing hologram images only for these two specific zones rather than the entire viewing area, the spatial light modulator operates at reduced resolution requirements, significantly lowering device complexity and data processing needs while maintaining sufficient image quality for each eye.
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
The solution effectively prevents binocular crosstalk, reduces data processing requirements, and enhances viewer comfort by ensuring that hologram images with different viewpoints are accurately projected to the left and right eyes without interference, thus improving the overall holographic display experience.
Implementation Method 1
a spatial light modulator configured to generate hologram patterns to modulate light
Implementation Method 2
the reference light is diffracted, and an image of the original object is reproduced
Data Source
AI summary
A holographic display apparatus includes a spatial light modulator configured to generate hologram patterns to modulate light; an illuminator configured to emit the light to the spatial light modulator; and a controller configured to control operations of the spatial light modulator and the illuminator, the spatial light modulator being configured to generate, from among the hologram patterns, a first hologram pattern and a second hologram pattern according to the control operations of the controller, the first hologram pattern and the second hologram pattern being configured to form a first hologram image and a second hologram image having different viewpoints, and the controller being configured to set a first phase modulation value of the first hologram pattern and a second phase modulation value of the second hologram pattern to be different from each other such that hologram images having different viewpoints are formed.