Beam Deflector Electrode Layout for Chromatic Aberration Control
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Solution Overview
Problem
Existing beam deflection apparatuses in holographic displays suffer from chromatic aberration due to varying deflection angles based on different wavelengths of light, leading to separation of colors like blue, green, and red, which affects the observer's perception.
Innovation Solution
The beam deflection apparatus aligns the drive electrodes of the first and second beam deflectors with the pixel arrangement of the spatial light modulator, applying signals with spatial periods proportional to wavelengths to equalize the ratio of λ/d to maintain constant deflection angles for different wavelengths of incident light, minimizing chromatic aberration by ensuring equal deflection angles for all regions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If beam deflection is performed using conventional methods, then light deflection is achieved, but chromatic aberration occurs due to varying deflection angles for different wavelengths
Solution Approach 1:
The patent divides the beam deflection system into multiple regions, each handling specific wavelength ranges. By assigning different deflection characteristics to different spatial regions, the system compensates for wavelength-dependent deflection variations, ensuring that blue, green, and red light components maintain consistent deflection angles despite their different wavelengths.
Solution Approach 2:
The patent dynamically adjusts deflection parameters based on wavelength characteristics. By changing the deflection angle parameters for different wavelength ranges and compensating for the relationship between spatial period and wavelength, the system maintains constant deflection angles across all wavelengths, thereby eliminating chromatic aberration.
2Measurement precision
If drive electrodes are aligned with pixel arrangement and spatial periods are adjusted, then chromatic aberration is reduced, but device complexity increases
Solution Approach 1:
The patent segments the drive electrode structure into multiple regions corresponding to different wavelength ranges. Each region has specifically designed electrode arrangements with tailored spatial periods. This segmentation allows independent optimization of each wavelength range while maintaining overall system functionality, reducing the complexity burden compared to a completely redesigned uniform system.
Solution Approach 2:
The patent designs a multi-functional drive electrode system that simultaneously handles multiple wavelength ranges with different spatial periods. The same electrode structure serves multiple purposes by deflecting blue, green, and red light with appropriate deflection characteristics, thereby reducing the need for separate dedicated components for each wavelength and lowering overall device complexity.
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 alignment reduces chromatic aberration, providing a unified perception of colors without separation, enhancing the observer's experience in holographic displays.
Implementation Method 1
a liquid crystal layer 155 between the two substrates 151, 152. A plurality of drive electrodes 153 are arranged on one of the first substrate 151 and the second substrate 152
Implementation Method 2
the reference light is emitted to the spatial light modulator having a hologram pattern formed according to an input CGH signal, the reference light may be diffracted through the hologram pattern to reproduce a three-dimensional image
Implementation Method 3
a first beam deflector 150 for deflecting light in the vertical direction in response to the pupil position information of the observer received from the eye tracker 180
Data Source
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AI summary
A beam deflection apparatus includes a first beam deflector that deflects light in a first direction and a second beam deflector that deflects light in a second direction perpendicular to the first direction, wherein the first beam deflector and the second beam deflector each include a first region for deflecting light of a first wavelength and a second region for deflecting light of a second wavelength, and a ratio of a spatial period of a signal applied to first drive electrodes arranged in the first region of the first beam deflector to the first wavelength is the same as a ratio of a spatial period of a signal applied to second drive electrodes arranged in the second region of the first beam deflector to the second wavelength.